A thick electrode coating apparatus for secondary batteries

Abstract

The present invention discloses a type of thick electrode coating device for secondary batteries, and specifically relates to lithium battery electrode processing technology. The device includes a mounting base, wherein the circulation transfer pump and the material transfer pump are fixedly installed on the upper rear side of the mounting base, and the filtration device and the material supply transfer device are fixedly installed in the upper middle side of the mounting base. The circulation transfer pump, the filtration device, and the material supply transfer device are all connected in a line by a supply pipe 1. A storage device is installed on the rear side of the mounting base, and a coating device is slidably installed on the upper left side of the mounting base. The type of thick electrode coating device for secondary batteries according to the present invention can apply a thick electrode in a single step using a high-viscosity slurry. Furthermore, the device can solve a series of problems such as leakage, thickness non-uniformity, and reduced production efficiency that occur when applying a high-viscosity slurry, and can effectively improve coating capability and coating quality.

Description

Technology Field

[0001] The present invention relates to the field of lithium battery electrode processing technology, and in particular to a device for thick electrode coating of secondary batteries. Background Technology

[0002] In the secondary battery manufacturing process, the primary objective of the initial process is to manufacture a battery electrode plate (taking lithium battery production as an example; the same applies hereinafter). The main processes include a mixing process, a coating process, and a rolling process. Among these, the coating process involves applying a battery slurry (hereinafter: slurry) to the surface of a battery current collector (hereinafter: substrate), drying it, and then forming an electrode plate.

[0003] As is well known, the current status of lithium batteries is characterized by low energy density and high costs. Therefore, increasing the energy density of batteries and lowering costs is a goal pursued by all battery manufacturers. By applying a thicker slurry to a substrate of the same thickness to achieve a higher surface density, the proportion of auxiliary materials such as substrates and separators within the battery can be effectively reduced. Consequently, this allows for a significant increase in energy density and a reduction in costs. Therefore, applying thicker electrodes or electrode plates with high surface density is a direction that all battery manufacturers are striving for.

[0004] The difficulty in applying thick electrodes lies in the challenge of ensuring thickness consistency. When using standard extrusion or transfer coating heads currently on the market, the slurry viscosity required to match the coating window is low. The coating viscosity window in mass production lines is approximately 1,500–12,000 CP. When applying thick electrodes with low-viscosity slurries, if the slurry has good fluidity and the wet film thickness is large, it becomes difficult for the slurry to fix its shape on the substrate surface and thickness consistency is compromised. This is due to factors such as internal pressure balance within the coating head, gravity affecting the electrode plate after application, and the uniformity of hot air during drying, making it impossible to meet application requirements. While using a dual coating head resolves the internal pressure balance issue and allows for the application of thicker wet film electrode plates, the high fluidity of the slurry cannot resolve the thickness consistency problem caused by external forces such as gravity and airflow uniformity. Furthermore, the interface between the two wet films applied by the dual coating head exhibits high internal resistance, resulting in reduced electrode plate performance.

[0005] Therefore, one effective method for applying a thick electrode at once is to increase the viscosity of the slurry.

[0006] However, after the slurry viscosity increases, the fluidity of the slurry deteriorates and it does not flatten, and the rheological characteristics of the slurry become more pronounced, so high-viscosity slurries cannot be applied with transfer coating heads or general extrusion coating heads currently on the market.

[0007] Therefore, applying thick electrodes with high surface density or applying high-viscosity slurries has become a difficult challenge to research in the renewable energy industry. The problem to be solved

[0008] The main objective of the present invention is to provide a type of secondary battery thick electrode coating device to effectively solve the problems raised in the background technology. means of solving the problem

[0009] To achieve the above objective, the technical solution adopted by the present invention is as follows:

[0010] A type of secondary battery thick electrode coating device comprises a mounting base, a circulation transfer pump, a material transfer pump, a filtration device, a material supply transfer device, a supply pipe 1, and a circulation pipe 1; the circulation transfer pump and the material transfer pump are both fixedly installed on the upper rear side of the mounting base, and the filtration device and the material supply transfer device are both fixedly installed in the upper middle of the mounting base, and the filtration device is located between the circulation transfer pump and the material supply transfer device, and the circulation transfer pump, the filtration device, and the material supply transfer device are all sequentially connected in series through supply pipe 1;

[0011] A storage device is installed on the rear of the above-mentioned mounting base, and a circulation pipe 1 is connected in a line between the output end of the storage device and the material transfer pump, and the output end of the circulation transfer pump is connected to the input end of the storage device. A coating device is slidably installed on the upper front part of the above-mentioned mounting base.

[0012] Preferably, the storage device comprises a storage tank, wherein a water supply pipe and a supply pipe are symmetrically installed at the front and rear of the upper portion of the storage tank, respectively, and a discharge pipe is installed at the bottom of the storage tank. A motor is installed in the middle portion of the upper portion of the storage tank, and the output end of the motor is connected to a connecting rod through a coupling. A stirring paddle is installed at the bottom of the connecting rod, the input end of the material transfer pump is connected to the discharge pipe using a circulation pipe 1, and the output end of the circulation transfer pump is connected to the water supply pipe through a supply pipe 1.

[0013] Preferably, the coating device includes multiple slide rails installed on the upper front surface of the mounting base, and clips are slidably attached to the outer surfaces of all the multiple slide rails. The upper ends of the multiple clips are jointly fixed to device base 2, and device base 1 is installed on the upper surface of device base 2. Multiple support members 1 are fixed to the rear surface of device base 1, and connecting plates are fixed together to the front surfaces of the multiple support members 1. A coating structure is fixed to the upper surface of device base 1, and multiple coating head compression roller drivers mounted on the upper surface of the mounting base are installed on the rear surface of device base 2.

[0014] Preferably, the coating structure comprises a coating valve seat 1 fixed to the upper part of the horizontal portion of the device base 1 and multiple coating valve 1 actuators installed on the front portion of the device base 1; a sliding groove 1 is formed on the upper front portion of the coating valve seat 1, a curved groove is formed on the upper rear portion of the coating valve seat 1, and multiple coating valve 1s are slidably installed inside the sliding groove 1. A coating valve seat 2 is fixed to the middle portion of the front of the vertical portion of the device base 1, and a sliding blocking plate is installed on the middle portion of the upper portion of the coating valve seat 2. Multiple coating valve 2s are installed on the front portion of the coating valve 4, and coating valve 3s are slidably installed jointly on the upper portion of the coating valve 4 and the upper portions of the multiple coating valve 2s. Blocking plates are installed on the front left and right sides of the coating valve 4, respectively, and these two blocking plates are located to the left of the leftmost coating valve 2 and to the right of the rightmost coating valve 2, respectively;

[0015] Circulation pipes 3 are fixed to the tops of all the above-mentioned coating valves 2;

[0016] A sliding groove corresponding to a plurality of circulation pipes 3 is formed at the top of the above-mentioned dispensing valve 3, and each of the plurality of circulation pipes 3 is located inside the plurality of sliding grooves;

[0017] The above-mentioned dispensing valve 2 and dispensing valve 3 are arranged in multiple numbers in the direction of material movement.

[0018] The input end of the above-mentioned circulation pipe 1 is installed in the middle left and middle right sections of device base 1, and is connected to the inside of the curved groove.

[0019] Preferably, multiple dispensing valve 3 actuators, multiple dispensing valve 4 actuators, and multiple dispensing valve 2 actuators are installed on the front of the connecting plate, and the output piston rods of the multiple dispensing valve 4 actuators penetrate the vertical section of the device base 1 and are all connected to the rear end of the dispensing valve 4. The output piston rods of the multiple dispensing valve 2 actuators penetrate the vertical section of the device base 1 and are each connected to the dispensing valve 2 on the same side. The multiple dispensing valve 4 actuators are evenly distributed on both the left and right sides of the multiple dispensing valve 2 actuators, and the output piston rods of the multiple dispensing valve 3 actuators penetrate the vertical section of the device base 1 and are jointly connected to the rear end of the dispensing valve 3.

[0020] Preferably, the outer surface of one lower portion of the application valve 2 facing the backup roller is set in a curved shape, and a curved slot is formed on one upper portion of the outer surface of the application valve 2 facing the backup roller. A pressure sensor 2 is installed in the inner middle portion of the curved slot, and a return hole connected to the inner side of the circulation pipe 3 on the same side is formed in the inner front portion of the curved slot.

[0021] Preferably, the lower front portion of the coating valve seat 2 is rounded and a pressure sensor 1 is installed.

[0022] Preferably, the lower portion of the dispensing valve 3 is in a curved, flat, irregular, or adjustable shape.

[0023] Preferably, a coating head lateral movement driving device is installed between the device base 2 and the device base 1. Effects of the invention

[0024] Compared to existing technology, the present invention has the following beneficial effects:

[0025] 1. In the present invention, the coating valve 2 is divided into multiple widths in the horizontal width direction, which corresponds to the width distribution of coating valve 1. The coating thickness of the slurry exiting from the outlet of coating valve 1 varies between regions with high flow rates and regions with low flow rates. At this time, by adjusting the spacing between the multiple coating valves 2 and the substrate in the horizontal direction, the flow rate of the slurry in the horizontal direction can be balanced once again, thereby making the flow rate of the slurry in the horizontal direction uniform and improving coating quality. Furthermore, through mutual cooperation among coating valve 1, coating valve 2, coating valve 3, and coating valve 4, the diffusion rate of the high-viscosity slurry in coating chamber 1, coating chamber 2, and coating chamber 3 can be increased, thereby improving the uniformity of the slurry distribution. Additionally, by adding a coating valve that performs a similar role to coating valve 2 or coating valve 3, the balance of the slurry flow rate in the horizontal direction can be further controlled.

[0026] 2. In the present invention, pressure sensor 1 and pressure sensor 2 are installed to measure slurry pressure within coating chamber 2 and coating chamber 3, thereby maintaining a constant pressure on the slurry within coating chamber 2 and coating chamber 3 during the coating process. Due to the action of pressure, the slurry flows more easily into the gap between coating chamber 2, coating chamber 3, and the substrate, allowing the slurry to adhere perfectly to the substrate and further improving the coating quality.

[0027] 3. In the present invention, unused slurry can be returned to the storage tank through circulation pipe 3 and circulation pipe 1, etc., allowing the slurry to be fully utilized. This helps to increase the utilization rate of the slurry, reduce waste, and lower coating costs. Brief explanation of the drawing

[0028] FIG. 1 is a schematic diagram showing the overall structure of the present invention; FIG. 2 is a schematic diagram showing the overall structure of the present invention from a different perspective; FIG. 3 is a schematic diagram showing an enlarged view of part A in FIG. 1 of the present invention; FIG. 4 is a schematic diagram showing a partial structure of the coating structure of the present invention; FIG. 5 is a schematic diagram showing the overall structure of the coating structure of the present invention; FIG. 6 is a schematic diagram showing an enlarged view of part B in FIG. 5 of the present invention; FIG. 7 is a partial front view of the present invention; FIG. 8 is a partial schematic diagram of Alternative 1 of the coating device of the present invention; FIG. 9 is a partial schematic diagram of Alternative 1 of the coating device of the present invention. Specific details for implementing the invention

[0029] In order to facilitate understanding of the technical means, creative features, objectives, and effects implemented in the present invention, the present invention is further described below in combination with specific embodiments.

[0030] As illustrated in Example 1, FIG. 1 and FIG. 2, a type of secondary battery thick electrode coating device comprises a mounting base (1), a circulation transfer pump (3), a material transfer pump (4), a filtration device (5), a material supply transfer device (6), a supply pipe 1 (7), and a circulation pipe 1 (8); the circulation transfer pump (3) and the material transfer pump (4) are both fixedly installed at the upper rear of the mounting base (1); the filtration device (5) and the material supply transfer device (6) are both fixedly installed at the upper middle of the mounting base (1); the filtration device (5) is located between the circulation transfer pump (3) and the material supply transfer device (6); and the circulation transfer pump (3), the filtration device (5), and the material supply transfer device (6) are all sequentially connected in a line using the supply pipe 1 (7).

[0031] The above circulation transfer pump (3), material transfer pump (4), filtration device (5), and material supply transfer device (6) are all of a standard design in existing technology, and in this plan, the filtration device (5) may use an EJS series high-viscosity slurry automatic cleaning filter such as the EJS-N type or EJS-W type;

[0032] In this plan, the material supply transfer device (6) can supply material using a screw feeder.

[0033] The slurry inside the storage device (2) is extracted through the above-mentioned circulation transfer pump (3) and then passed through the supply pipe 1 (7) in sequence through the filtration device (5), material supply transfer device (6), coating device (9), circulation pipe 1 (8), and material transfer pump (4) to finally return to the inside of the storage device (2).

[0034] Specifically, in order to reduce the number of bubbles in the slurry by stirring the slurry during the process, a storage device (2) is installed on the rear of the mounting stand (1), and a circulation pipe 1 (8) is connected in a line between the output end of the storage device (2) and the material transfer pump (4). The output end of the circulation transfer pump (3) is connected to the input end of the storage device (2), and a coating device (9) is slidably installed on the upper front part of the mounting stand (1).

[0035] The storage device (2) includes a storage tank (21), and a water pipe and a supply pipe are installed symmetrically on the upper front and rear of the storage tank (21). A discharge pipe is installed at the bottom of the storage tank (21), and a motor (24) is installed in the middle upper part of the storage tank (21). The output end of the motor (24) is connected to a connecting rod through a coupling, and a stirring paddle (22) is installed at the bottom of the connecting rod. The input end of the material transfer pump (4) is connected to the discharge pipe using a circulation pipe 1 (8), and the output end of the circulation transfer pump (3) is connected to the water pipe using a supply pipe 1 (7). A valve is installed on the outer surface of the circulation pipe 1 (8);

[0036] Material can be supplied into the storage tank (21) through the supply pipe, and the slurry inside the storage tank (21) can be extracted through the cooperation of the circulation transfer pump (3), supply pipe 1 (7), and discharge pipe;

[0037] During the process, after the slurry is injected into the storage tank (21), the motor (24) is operated to drive the stirring paddle (22) in cooperation with the connecting rod, thereby continuously stirring the slurry;

[0038] Unextracted slurry is extracted back into the storage tank (21) via the material transfer pump (4) and stored, and can be recirculated to reduce waste of raw materials. When not applying, all application valves 1 (964) are closed and the valve of the circulation pipe 1 (8) is opened so that the slurry can be continuously circulated between the storage tank (21) and the curved groove (965) of the application chamber 1, thereby preventing the slurry from settling;

[0039] The filtration device (5) can filter out impurities or particles in the slurry. The material supply transfer device (6) transfers the filtered slurry through a pipe to the coating chamber 1.

[0040] Example 2, this embodiment is based on Example 1, in which a pumped material is applied to a coating substrate (11) through a coating device (9).

[0041] Specifically, to achieve the aforementioned purpose, referring to Drawing 4-7, the coating device (9) in this invention includes multiple slide rails (92) installed on the upper front surface of the mounting base (1), and clips (91) are slidably attached to the outer surfaces of all the multiple slide rails (92). The upper ends of the multiple clips (91) are fixed together to the device base 2 (93), and the device base 1 (94) is installed on the upper end of the device base 2 (93). Multiple support members 1 (95) are fixed to the rear end of the device base 1 (94), and a connecting plate is fixed to the front end of the multiple support members 1 (95) in common. A coating structure (96) is fixed to the upper end of the device base 1 (94), and multiple coating head compression roller drivers (97) mounted on the upper end of the mounting base (1) are installed on the rear end of the device base 2 (93);

[0042] Through the mutual coupling of the installed clip (91) and the slide rail (92), the device base 2 (93), device base 1 (94), and multiple supports 1 (95), etc., can slide on the upper front of the mounting base 1 under the drive of the coating head compression roller drive (97);

[0043] In order to move the coating structure (96), etc., and also to enable material supply and recovery, the middle section between the supply pipe 1 (7) and the circulation pipe 1 (8) in this method is made of a high-pressure hose, which maintains the stability of the rear section while the front section of the supply pipe 1 (7) and the circulation pipe 1 (8) moves and ensures that the slurry is delivered normally;

[0044] The above support 1 (95) is used to support the drive unit inside the coating structure (96), and can drive the operation of the structure by supporting, for example, the coating valve 3 drive (973), the coating valve 4 drive (974), and the coating valve 2 drive (975).

[0045] The coating structure (96) includes a coating valve seat 1 (962) fixed to the upper horizontal portion of the device base 1 (94) and multiple coating valve 1 actuators (961) installed on the front portion of the device base 1 (94). A sliding groove 1 (963) is formed on the upper front portion of the coating valve seat 1 (962), and a curved groove (965) is formed on the upper rear portion of the coating valve seat 1 (962). Multiple coating valves 1 (964) are slidably installed inside the sliding groove 1 (963). A coating valve seat 2 (966) is fixed to the middle portion of the front vertical portion of the device base 1 (94), and a blocking plate (976) is slidably installed on the middle portion of the upper portion of the coating valve seat 2 (966). Multiple coating valves 2 (968) are installed on the front portion of the coating valve 4 (967), and coating valves 3 (969) are slidably installed on the upper portion of the coating valve 4 (967) and the upper portion of the multiple coating valves 2 (968). Blocking plates (976) are installed on the front left and right sides of the dispensing valve 4 (967), respectively, and these two blocking plates (976) are located to the left of the leftmost dispensing valve 2 (968) and to the right of the rightmost dispensing valve 2 (968), respectively;

[0046] The above multiple dispensing valves 1 (964) divide the space between the dispensing valve seat 2 (966) and the dispensing valve seat 1 (962) into two parts, a front and a rear, each defined as a dispensing chamber 2 and a dispensing chamber 1;

[0047] A curved slot (9683) is formed on one upper side of the outer surface of the dispensing valve 2 (968) facing the backup roller (10);

[0048] The space between the inner side of the curved slot (9683) and the outer surface of the coating substrate (11) is defined as the coating chamber 3.

[0049] The width of the coating chamber 1 is similar to the coating width in the horizontal direction, and the slurry spreads horizontally within the coating chamber 1 and then enters the coating chamber 2 through the coating valve 1 (964). The width of the coating valve 1 (964) is the same as that of the coating chamber 1, and the coating valve 1 (964) consists of several blocks arranged continuously in the horizontal direction. By adjusting the gap between the coating valve 1 (964) and the coating valve seat 2 (966), the uniformity of the flow rate of the slurry flowing horizontally from the coating chamber 1 to the coating chamber 2 is initially controlled.

[0050] However, when viewed from the horizontal direction, there is inevitably a difference in the flow rate of the slurry flowing from coating chamber 1 to coating chamber 2. When not applying, all coating valves 1 (964) are closed and the valve of the circulation pipe 1 (8) is opened so that the slurry can be continuously circulated between the storage tank (21) and coating chamber 1 to prevent the slurry from settling.

[0051] A circulation pipe 3 (972) is fixed to the top of each of the multiple application valves 2 (968);

[0052] Several circulation pipes 3 (972) are all connected to circulation pipe 1 (8) and simultaneously backflow unused slurry.

[0053] At the top of the dispensing valve 3 (969), several sliding grooves (971) corresponding to the same-side circulation pipe 3 (972) are formed, and each of the circulation pipe 3 (972) is located within the several sliding grooves (971);

[0054] During the process, the horizontal position of the coating valve 3 (969) changes, and relative sliding occurs between the coating valve 2 (968) and the coating valve 3 (969) during the process. Therefore, in order to discharge excess slurry into the circulation pipe 3 (972) through the recirculation port (9681), the circulation pipe 3 (972) must move simultaneously with the coating valve 2 (968), and the sliding groove (971) is designed to ensure the integrity of the circulation pipe 3 (972) by preventing the coating valve 3 (969) from compressing the circulation pipe 3 (972) during the movement process;

[0055] Likewise, the middle section of several circulation pipes 3 (972) is also made of high-strength hose and is used to extend the travel path of the circulation pipes 3 (972).

[0056] The dispensing valve 2 (968) and dispensing valve 3 (969) are arranged in multiple numbers in the direction of movement of the substrate.

[0057] The input end of the circulation pipe 1 (8) is installed in the middle left and middle right parts of the device base 1 (94) and is connected to the inside of the curved groove (965). This allows excess slurry from the coating chamber 1 or slurry to return to the inside of the storage tank (21) through the circulation pipe 1 (8) when the coating valve 1 (964) is closed.

[0058] Additionally, referring to Drawings 4 and 6, in this design, multiple dispensing valve 3 actuators (973), multiple dispensing valve 4 actuators (974), and multiple dispensing valve 2 actuators (975) are installed on the front of the connecting plate. The output piston rods of the multiple dispensing valve 4 actuators (974) penetrate the vertical portion of the device base 1 (94) and are all connected to the rear end of the dispensing valve 4 (967). The output piston rods of the multiple dispensing valve 2 actuators (975) penetrate the vertical portion of the device base 1 (94) and are each connected to the dispensing valve 2 (968) on the same side. The multiple dispensing valve 4 actuators (974) are evenly distributed on both the left and right sides of the multiple dispensing valve 2 actuators (975), and the output piston rods of the multiple dispensing valve 3 actuators (973) penetrate the vertical portion of the device base 1 (94) and are jointly connected to the rear end of the dispensing valve 3 (969);

[0059] The above multiple application valve 3 actuators (973), multiple application valve 4 actuators (974), and multiple application valve 2 actuators (975) can each control the left and right movement of the application valve 3 (969), application valve 4 (967), and application valve 2 (968);

[0060] However, when the multiple dispensing valve 4 actuators (974) start operating, the multiple dispensing valve 3 actuators (973) must move in sync, and even after the dispensing valve 4 (967) advances to a designated position, the multiple dispensing valve 2 (968) can continue to advance separately.

[0061] One lower side of the outer surface of the multiple coating valves 2 (968) facing the backup roller (10) is curved, so that the coating material (11) fits better into the curved shape of the outer surface of the backup roller (10), thereby enhancing the coating effect of the slurry. A pressure sensor 2 (9682) is installed in the middle of the inner side of the curved slot (9683), and a return hole (9681) connected to the inner side of the same side circulation pipe 3 (972) is formed on the inner front side of the curved slot (9683);

[0062] The lower front portion of the application valve seat 2 (966) is rounded and a pressure sensor 1 (9661) is installed therein;

[0063] The lower front portion of the coating valve 3 (969) is shaped like a curve, flat, irregular shape, or adjustable structure, so that the coating substrate (11) fits better into the shape bent on the outer surface of the backup roller (10), thereby enhancing the coating effect of the slurry.

[0064] In the above implementation process, the substrate is wrapped around the backup roller (10), and as the backup roller (10) rotates, the substrate moves to maintain a stable coating state, and the slurry fills the coating chamber 2, at which time the slurry is already coated on the substrate.

[0065] In order to ensure that the slurry adheres perfectly to the substrate and to solve the problem of leakage during the application process, as shown in Drawing 4, the lower front portion of the application valve seat 2 (966) is rounded and several pressure sensors 1 (9661) are installed.

[0066] The pressure sensor 1 (9661) feeds back the slurry pressure in the coating chamber 2 to the electric control system, and the system controls the flow rate of the slurry supplied by the material supply transfer device (6) to the coating chamber 1 through PID adjustment according to the actual pressure and the set pressure, thereby maintaining the pressure in the coating chamber 2 stably within the system's set pressure range.

[0067] As the backup roller (10) moves the coating substrate (11) to the coating chamber 3 and the coating substrate (11) transports the slurry attached to its surface to the coating chamber 3, this increases the power to continuously supply the slurry inside the mold head, thereby solving the problem of excessive supply pressure for high-viscosity slurry coating;

[0068] The coating material (11) carries the slurry and moves from coating chamber 2 to coating chamber 3, passing through coating valve 2 (968) in the process. As shown in Drawing 7, several coating valves 4 (967) are arranged in close proximity in parallel to form the target coating width.

[0069] The dispensing valve 2 (968) uses the dispensing valve 4 (967) as a support and moves in the direction of the backup roller (10) under the driving of the dispensing valve 1 (964) and the curved groove (965) to adjust the gap between the dispensing valve 2 (968) and the substrate.

[0070] When applying, the slurry passes through the gap between the application valve 2 (968) and the substrate, and controls the flow rate evenly distributed in the horizontal direction by controlling various gaps in the horizontal direction at the same application speed.

[0071] When the slurry passes through the coating valve 1 (964), the transverse flow velocity of the slurry is different. According to the rheological properties of the slurry, the transverse flow rate distribution of the slurry is different. When the slurry passes through the gap between the coating valve 2 (968) and the substrate, the gap is adjusted appropriately so that the flow rate of the slurry is consistent when the slurry reaches the coating chamber 3 after passing through the coating valve 2 (968).

[0072] The present invention also includes four blocking plates (976), each installed on both sides of the coating chamber 2 and the coating chamber 3. The blocking plates (976) control the width of the slurry on the coating substrate (11) so that the slurry is confined within the target coating width area in the horizontal direction.

[0073] When a high-viscosity slurry of the same viscosity reaches the application chamber 3, the lateral pressure within the application chamber 3 can be balanced.

[0074] In this plan, a valve is also installed between circulation pipe 3 (972) and circulation pipe 1 (8).

[0075] With the valve of the circulation pipe 3 (972) closed, the coating valve 4 actuator (974) and the coating valve 2 actuator (975) are controlled to move the coating valve 4 (967) and the coating valve 2 (968), and the gap between the coating valve 2 (968) and the coating substrate (11) is appropriately adjusted to obtain a uniform effect of the slurry flow rate;

[0076] Under closed-loop control of the control system, the pressure of the coating chamber 3 can be stabilized within a set range. If the local pressure in the transverse direction within the coating chamber 3 is excessively high and the gap adjustment affects the uniformity of the slurry, the valve opening on the circulation pipe 3 (972) at the corresponding location must be adjusted to balance the pressure of the slurry within the coating chamber 3.

[0077] After the high viscosity slurry undergoes flow rate matching and pressure stabilization treatments, a stable electrode plate of the target thickness is formed through the gap between the coating valve 3 (969) and the coating substrate (11).

[0078] Due to the characteristic that high viscosity slurry flow is difficult, this coating device can stably implement the coating of thick electrode plates.

[0079] In this method, the coating valve 4 actuator (974), coating valve 2 actuator (975), coating head compression roller actuator (97), coating valve 3 actuator (973), and coating valve 1 actuator (961) may use one of an electric cylinder, a pneumatic cylinder, or a hydraulic cylinder during the implementation process, provided that the generated driving force meets the production requirements.

[0080] A coating head lateral movement drive device is installed between device base 2 (93) and device base 1 (94).

[0081] The above horizontal drive device is a general design of the existing technology and consists of a concave fixed base plate, a screw rod, and a servo motor. Among these, the device base 1 (94) is connected to the screw rod with a screw, and the concave fixed base plate is installed on the top of the device base 2 (93) and is slidably connected to the concave fixed base plate. The screw rod is rotatably connected to the fixed base plate, and the servo motor is installed on the side of the concave fixed base plate to drive and rotate the screw rod, thereby allowing the coating structure (96), etc., to move horizontally.

[0082] In Example 3, an alternative method 1 is additionally configured for the coating device (9), and as shown in Drawing 8, the shape of the curved groove (965) is changed, and a sliding groove 2 (981) and a screw (983) are added based on Examples 1 and 2. The installation method and installation location of the remaining structure are the same as in Examples 1 and 2;

[0083] Likewise, a sliding groove 2 (981) is formed on the upper front side of the dispensing valve 3 (969) and is rotatably connected to one side of the backup roller (10) at regular intervals by several screws (983). All of the screw rods (983) extend outward by penetrating one side of the inner side of the sliding groove 2 (981) far from the backup roller (10) and are rotatably connected to the side of the dispensing valve 3 (969) far from the backup roller (10).

[0084] During the implementation process, the screw (983) can be rotated in the forward or reverse direction to change the angle at which the coating valve 3 (969) faces the coating substrate (11), thereby correcting the straightness of the slurry on the coating substrate (11) and improving the coating quality.

[0085] In Example 4, an alternative method 2 is additionally configured for the coating device (9). As shown in Drawing 9, in this embodiment, the installation positions of the coating valve 1 actuator (961) and coating valve 1 (964) are changed from the existing vertical direction to a horizontal direction. The coating valve 1 actuator (961) and coating valve 1 (964) are located on the same horizontal plane and are both located below the coating valve 4 actuator (974). Based on Examples 1 and 2, a sliding groove 3 (984), coating valve 5 (985), coating valve 5 actuator (986), and support plate 2 (987) are added. The installation method and installation position of the remaining structures are the same as in Examples 1 and 2;

[0086] As can be seen in Drawing 9, the coating valve 1 (964) has a curved surface on the side close to the coating substrate (11) to improve fluidity during the flow process of the slurry;

[0087] The installation locations of the various application valve 1 actuators (961) can all be installed on the support plate 1 (95);

[0088] Specifically, a sliding groove 3 (984) is formed in front of the coating valve 3 (969), and several horizontally distributed coating valves 5 (985) are slidably arranged inside the sliding groove 3 (984). Each of the coating valves 5 (985) has a coating valve 5 actuator (986) installed in the middle section of one side, far from the coating substrate (11), and a support plate 2 (987) is fixed between the rear end of each coating valve 5 actuator (986) and the coating valve 3 (969).

[0089] In this method, the application valve 5 actuator (986) may use one of an electric cylinder, a pneumatic cylinder, or a hydraulic cylinder during the implementation process, and the generated driving force only needs to meet the production requirements.

[0090] In this embodiment, multiple coating valves 5 (985) are added, and the protrusion lengths of each of the coating valves 5 (985) are adjusted under the driving of the coating valve 5 actuator (986) to modify the straightness of the slurry on the coating substrate (11) and improve the coating quality.

[0091] The basic principles, key features, and advantages of the present invention have been described above. Those skilled in the art should understand that the present invention is not limited to the embodiments described above, and that the embodiments and descriptions provided are merely illustrative of the principles of the present invention. Various modifications and improvements may be made to the present invention without departing from the spirit and scope of the invention, and such modifications and improvements are all included in the claims. The claims of the present invention are defined by the appended claims and their equivalents. Explanation of the symbols

[0092] 1: Stand 2: Storage device 21: Storage tank 22: Stirring paddle 24: Motor 3: Circulation transfer pump 4: Material transfer pump 5: Filtration device 6: Material supply transfer device 7: Supply pipe 1 8: Circulatory duct 1 9: Coating device 91: Clip 92: Slide Rail 93: Device Base 2 94: Device Base 1 95: Support 1 96: Coating structure 961: Dispensing valve 1 actuator 962: Application Valve Seat 1 963: Sliding Home 1 964: Dispensing valve 1 965: Curved groove 966: Coating Valve Seat 2 9661: Pressure Sensor 1 967: Dispensing valve 4 968: Dispensing valve 2 9681: Recirculation hole 9682: Pressure Sensor 2 9683: Curved slot 969: Dispensing valve 3 971: Sliding Home 972: Circulatory tube 3 973: Dispensing valve 3 actuator 974: Dispensing valve 4 actuator 975: Dispensing valve 2 actuator 976: Block 97: Coating head compression roller driver 981: Sliding Home 2 983: Screw 984: Sliding Home 3 985: Dispensing valve 5 986: Dispensing valve 5 actuator 987: Support 2 10: Backup Roller 11: Coating material

Claims

Claim 1 A type of secondary battery thick electrode coating device comprises a mounting base (1), a circulation transfer pump (3), a material transfer pump (4), a filtration device (5), a material supply transfer device (6), a supply pipe 1 (7), and a circulation pipe 1 (8). The circulation transfer pump (3) and the material transfer pump (4) are both fixedly installed on the upper rear side of the mounting base (1), and the filtration device (5) and the material supply transfer device (6) are both fixedly installed on the upper middle side of the mounting base (1). The filtration device (5) is located between the circulation transfer pump (3) and the material supply transfer device (6), and the circulation transfer pump (3), the filtration device (5), and the material supply transfer device (6) are all sequentially connected in series through the supply pipe 1 (7). A storage device (2) is installed on the rear side of the mounting base (1), and the output end of the storage device (2) and the material transfer pump (4) are connected in series through the circulation pipe 1 (8), and the output end of the circulation transfer pump (3) and the input end of the storage device (2) are connected. A type of secondary battery thick electrode coating device characterized by the fact that a coating device (9) is slidably installed on the upper front surface of the mounting stand (1), the coating device (9) includes multiple slide rails (92) installed on the upper front surface of the mounting stand (1), clips (91) are slidably attached to the outer surfaces of all the multiple slide rails (92), the upper ends of all the multiple clips (91) are fixed to the device base 2 (93), the device base 1 (94) is installed on the upper end of the device base 2 (93), multiple support members 1 (95) are fixed to the rear end of the device base 1 (94), the front ends of the multiple support members 1 (95) are jointly fixed to a connecting plate, a coating structure (96) is fixed to the upper end of the device base 1 (94), and multiple coating head compression roller drivers (97) mounted on the upper end of the mounting stand (1) are installed on the rear end of the device base 2 (93). Claim 2 A type of secondary battery thick electrode coating device according to claim 1, wherein the storage device (2) includes a storage tank (21), and a water pipe and a supply pipe are installed symmetrically at the top front and back of the storage tank (21), a discharge pipe is installed at the bottom of the storage tank (21), a motor (24) is installed at the middle part of the top of the storage tank (21), a connecting rod is installed at the output end of the motor (24) through a coupling, a stirring paddle (22) is installed at the bottom of the connecting rod, the input end of the material transfer pump (4) is connected to the discharge pipe through a circulation pipe 1 (8), and the output end of the circulation transfer pump (3) is connected to the water pipe through a supply pipe 1 (7). Claim 3 delete Claim 4 In claim 1, the coating structure (96) comprises a coating valve seat 1 (962) fixed to the upper horizontal portion of the device base 1 (94) and a plurality of coating valve 1 actuators (961) installed at the front end of the device base 1 (94); a sliding groove 1 (963) is formed on the upper front portion of the coating valve seat 1 (962), a curved groove (965) is formed on the upper rear portion, and a plurality of coating valve 1 (964) is slidably installed inside the sliding groove 1 (963); a coating valve seat 2 (966) is fixed to the middle portion of the front vertical portion of the device base 1 (94), a sliding blocking plate (976) is installed on the middle portion of the upper portion of the coating valve seat 2 (966); a plurality of coating valve 2 (968) is installed on the front portion of the coating valve 4 (967), and a coating is formed on the upper portion of the coating valve 4 (967) and the upper portion of the plurality of coating valve 2 (968). Valve 3 (969) is installed with sliding. Blocking plates (976) are installed on the front left and right sides of the above-mentioned coating valve 4 (967), respectively, and these two blocking plates (976) are located to the left of the leftmost coating valve 2 (968) and to the right of the rightmost coating valve 2 (968), respectively; A type of secondary battery thick electrode coating device characterized by the fact that a circulation pipe 3 (972) is fixed to the top of each of the above coating valves 2 (968); a sliding groove (971) corresponding to the above coating valve 3 (969) is formed on the top of the above coating valve 3 (969), and each of the above coating valve 3 (972) is located inside the above sliding groove (971); the above coating valves 2 (968) and coating valve 3 (969) are arranged in a line in the direction of material movement; and the input end of the above circulation pipe 1 (8) is installed in the left middle part and the right middle part of the device base 1 (94) and is connected to the inside of the curved groove (965). Claim 5 A type of secondary battery thick electrode coating device according to claim 4, wherein a plurality of coating valve 3 actuators (973), a plurality of coating valve 4 actuators (974), and a plurality of coating valve 2 actuators (975) are installed on the front of the connecting plate, and the output piston rods of the plurality of coating valve 4 actuators (974) penetrate the vertical portion of the device base 1 (94) and are all connected to the rear end of the coating valve 4 (967), and the output piston rods of the plurality of coating valve 2 actuators (975) penetrate the vertical portion of the connecting base 1 (94) and are each connected to the coating valve 2 (968) on the same side, and the plurality of coating valve 4 actuators (974) are evenly distributed on both the left and right sides of the plurality of coating valve 2 actuators (975), and the output piston rods of the plurality of coating valve 3 actuators (973) penetrate the vertical portion of the device base 1 (94) and are jointly connected to the rear end of the coating valve 3 (969). Claim 6 A type of secondary battery thick electrode coating device according to claim 5, wherein the outer surface of a plurality of coating valves 2 (968) is set in a curved shape at one lower end facing the backup roller (10), a curved slot (9683) is formed at one upper end facing the backup roller (10), a pressure sensor 2 (9682) is installed in the inner middle part of the curved slot (9683), and a recirculation hole (9681) connected to the inner side of the same side circulation pipe 3 (972) is formed in the inner front part of the curved slot (9683). Claim 7 A type of secondary battery thick electrode coating device according to claim 4, characterized in that the lower front surface of the coating valve seat 2 (966) is rounded and a pressure sensor 1 (9661) is installed. Claim 8 A type of secondary battery thick electrode coating device according to claim 4, characterized in that the lower portion of the front end of the coating valve 3 (969) is in a curved, flat, irregular, or adjustable structure. Claim 9 A type of secondary battery thick electrode coating device according to claim 1, characterized in that a coating head lateral movement driving device is installed between the device base 2 (93) and the device base 1 (94).

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