Secondary battery thick electrode coating equipment

Abstract

The invention discloses secondary battery thick electrode coating equipment, and particularly relates to a lithium battery electrode processing technology, the secondary battery thick electrode coating equipment comprises a mounting rack, a circulating conveying pump and a material conveying pump are both fixedly mounted at the rear part of the upper end of the mounting rack, and a filtering device and a feeding conveying device are both fixed at the middle part of the upper end of the mounting rack; the circulating conveying pump, the filtering device and the feeding conveying device are sequentially connected in series through a first feeding pipeline. A storage device is arranged on the rear portion of the mounting frame, and a coating device is arranged on the left portion of the upper end of the mounting frame in a sliding mode. According to the thick electrode coating equipment for the secondary battery disclosed by the invention, the thick electrode can be coated at one time by using high-viscosity slurry. And meanwhile, the equipment can solve a series of problems of foil leakage, non-uniform thickness, low production efficiency and the like generated during coating of high-viscosity slurry, and the coating capacity and the coating quality are effectively improved.

Description

Technical Field

[0001] The invention relates to the technical field of lithium battery electrode processing, and in particular to a secondary battery thick electrode coating device. Background Art

[0002] In the process of secondary battery manufacturing, the main purpose of the previous process is to manufacture battery pole pieces (taking the production of lithium batteries as an example, the same below), which mainly includes stirring process, coating process and rolling process. Among them, the coating process is to coat the battery slurry (hereinafter referred to as: slurry) on the surface of the battery collector (hereinafter referred to as: substrate) and form pole pieces after drying.

[0003] As we all know, the current status of lithium batteries is low energy density and high cost, so improving the energy density of batteries and reducing the cost of batteries are the goals pursued by all battery manufacturers. On the same thickness of the substrate, coating thicker slurry and obtaining higher surface density can effectively reduce the proportion of auxiliary materials such as substrates and diaphragms in the battery, thereby significantly improving the energy density of the battery and reducing the cost of the battery. Therefore, coating thick electrodes or high surface density pole pieces is also the direction that all battery manufacturers are working towards.

[0004] The difficulty in coating thick electrodes is that it is difficult to ensure the thickness consistency of the coated thick electrodes. At present, when the conventional extrusion coating head or transfer coating head on the market is coated, the slurry viscosity that adapts to its coating window is relatively low, and the coating viscosity window on the mass production line is about 1500-12000CP. When low-viscosity slurry is coated on thick electrodes, due to the good fluidity of the slurry, when the wet film thickness is large, it is affected by the pressure balance during the internal transportation process of the coating head, the gravity of the electrode after coating, and the uniformity of the hot air during baking, which makes it difficult for the slurry to fix the shape on the surface of the substrate, so that the thickness consistency is poor and cannot meet the use requirements. The use of a double-layer coating head can solve the problem of pressure balance in the internal transportation of the coating head, and can coat thicker wet film electrodes, but it cannot solve the problem of thickness consistency caused by the external forces such as gravity and wind uniformity on the slurry with good fluidity. At the same time, the internal resistance of the two layers of wet film coated by the double-layer coating head is large, and the electrode performance is poor.

[0005] Therefore, an effective way to coat thick electrodes in one go is to increase the viscosity of the slurry.

[0006] However, after the viscosity of the slurry increases, the fluidity of the slurry becomes worse, there is no leveling property, and the rheological properties of the slurry become more obvious, resulting in the transfer coating head and conventional extrusion coating head currently on the market being unable to coat high-viscosity slurries.

[0007] In summary, coating thick electrodes with high surface density and coating high viscosity slurry has become a difficult problem that the new energy industry is studying. Summary of the invention

[0008] The main purpose of the present invention is to provide a secondary battery thick electrode coating device, which can effectively solve the problems in the background technology.

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

[0010] A secondary battery thick electrode coating device, comprising a mounting frame, a circulating delivery pump, a material delivery pump, a filtering device, a feed delivery device, a feed pipeline 1 and a circulating pipeline 1, wherein the circulating delivery pump and the material delivery pump are both fixedly mounted at the rear of the upper end of the mounting frame, the filtering device and the feed delivery device are both fixed at the middle of the upper end of the mounting frame, the filtering device is located between the circulating delivery pump and the feed delivery device, and the circulating delivery pump, the filtering device and the feed delivery device are all connected in series in sequence using a feed pipeline 1;

[0011] A material storage device is provided at the rear of the mounting frame, an output end of the material storage device and a material delivery pump are connected in series via a circulation pipeline, an output end of the circulation delivery pump is connected to an input end of the material storage device, and a coating device is slidably provided at the left upper end of the mounting frame.

[0012] Preferably, the storage device includes a storage tank, a return pipe and a feed pipe are symmetrically installed on the top of the storage tank, a discharge pipe is installed at the bottom of the storage tank, a motor is installed in the middle of the top wall of the storage tank, a connecting rod is installed at the output end of the motor through a coupling, a stirring paddle is installed at the lower end of the connecting rod, the input end of the feed conveying pump is connected to the discharge pipe using a circulation pipeline 1, and the output end of the circulation conveying pump is connected to the return pipe using a feed pipeline 1.

[0013] Preferably, the coating device includes several slide rails installed at the front of the upper end of the mounting frame, several of the slide rails are provided with sliding buckles on their outer surfaces, a base 2 is commonly fixed to the upper ends of several of the buckles, a base 1 is provided at the upper end of the base 2, several support frames 1 are fixed to the rear of the base 1, a connecting plate is commonly fixed to the front ends of the support frame 1 and several support frames 1, a coating structure is fixed to the upper end of the base 1, and several coating head roller drives installed on the upper end of the mounting frame are provided at the rear end of the base 2.

[0014] Preferably, the coating structure comprises a coating valve seat 1 fixed to the upper end of a horizontal part of a base and a plurality of coating valves 1 installed at the front of the base, a movable groove 1 is provided at the front of the upper end of the coating valve seat 1, an arc-shaped groove is provided at the rear of the upper end of the coating valve seat 1, a plurality of coating valves 1 are slidably arranged in the inner cavity of the movable groove 1, a coating valve seat 2 is fixed to the middle of the front end of the vertical part of the base, a baffle is slidably arranged at the middle of the upper end of the coating valve seat 2, a plurality of coating valves 2 are provided at the front end of the coating valve 4, a coating valve 3 is slidably arranged at the upper end of the coating valve 4 and the upper ends of the plurality of coating valves 2, baffles are installed at the left and right parts of the front end of the coating valve 4, and the two baffles are respectively located at the left side of the leftmost coating valve 2 and the right side of the rightmost coating valve 2;

[0015] A circulation pipe 3 is fixed on the upper end of the coating valve 2;

[0016] The upper end of the coating valve 3 is provided with a plurality of chutes corresponding to the circulation pipe 3 on the same side, and the plurality of circulation pipes 3 are respectively located in the inner cavities of the plurality of chutes;

[0017] The coating valve 2 and the coating valve 3 are arranged in a plurality in the moving direction of the substrate.

[0018] The input ends of the circulation pipeline 1 are installed at the middle of the left end and the middle of the right end of the base 1 and are both communicated with the inner cavity of the arc-shaped groove.

[0019] Preferably, a number of coating valve three drives, a number of coating valve four drives and a number of coating valve two drives are installed at the front end of the connecting plate, the output end piston rods of the coating valve four drives pass through a vertical part of the base and are all connected to the rear end of the coating valve four, the output end piston rods of the coating valve two drives pass through a vertical part of the base and are respectively connected to the coating valve two on the same side, the coating valve four drives are evenly distributed on the left and right sides of the coating valve two drives, and the output end piston rods of the coating valve three drives pass through a vertical part of the base and are commonly connected to the rear end of the coating valve three.

[0020] Preferably, the lower portion of the outer surface of the second coating valve facing the back roller is arc-shaped, the upper portion of the outer surface of the second coating valve facing the back roller is provided with an arc-shaped groove, a pressure sensor 2 is installed in the middle of the inner surface of the arc-shaped groove, and a reflux hole communicating with the third inner cavity of the circulation pipe on the same side is provided at the front of the inner surface of the arc-shaped groove.

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

[0022] Preferably, the lower portion of the front end of the coating valve is an arc-shaped, flat, special-shaped or adjustable structure.

[0023] Preferably, a coating head lateral movement driving device is installed between the base two and the base one.

[0024] Compared with the prior art, 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 lateral width direction, corresponding to the width distribution of the coating valve 1; the slurry coming out of the outlet of the coating valve 1 has different coating thicknesses in the area with large flow and the area with small flow; at this time, the gaps between several coating valves 2 and the substrate in the lateral direction are adjusted to balance the slurry flow in the lateral direction again, so that the slurry flow in the lateral direction is the same, thereby improving the coating quality; at the same time, the diffusion speed of the high-viscosity slurry in the coating chamber 1, the coating chamber 2 and the coating chamber 3 can be increased through the mutual cooperation between the coating valve 1, the coating valve 2, the coating valve 3 and the coating valve 4, thereby improving the uniformity of the slurry distribution. In addition, by adding a coating valve with a similar function to the coating valve 2 or the coating valve 3, the balance of the slurry flow in the lateral direction can be further controlled.

[0026] 2. In the present invention, pressure sensor 1 and pressure sensor 2 for measuring the slurry pressure are arranged in coating chamber 2 and coating chamber 3. During the coating process, the slurry in coating chamber 2 and coating chamber 3 are kept at a certain pressure; under the action of pressure, the slurry flows more easily into the gap between coating chamber 2 and coating chamber 3 and the substrate, so that the slurry adheres perfectly to the substrate, further improving the coating quality.

[0027] 3. In the present invention, the unused slurry can be returned to the inner cavity of the storage tank through the circulation pipe three and the circulation pipe one, so as to make full use of the slurry, improve the utilization rate of the slurry, reduce waste, and thus reduce the coating cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0029] Figure 2 It is a schematic diagram of another viewing angle of the overall structure of the present invention;

[0030] Figure 3 For the present invention Figure 1 The enlarged schematic diagram at A in the middle;

[0031] Figure 4 It is a schematic diagram of the local structure of the coating structure of the present invention;

[0032] Figure 5 It is a schematic diagram of the overall structure of the coating structure of the present invention;

[0033] Figure 6 For the present invention Figure 5 The enlarged schematic diagram of point B in the middle;

[0034] Figure 7 It is a partial front view of the present invention;

[0035] Figure 8 It is a partial schematic diagram of a first alternative solution of the coating device of the present invention;

[0036] Fig. 9 It is a partial schematic diagram of a coating device replacement scheme of the present invention.

[0037] In the figure: 1, mounting frame; 2, material storage device; 21, material storage tank; 22, stirring paddle; 24, motor; 3, circulation pump; 4, material delivery pump; 5, filtering device; 6, material feeding device; 7, material feeding pipeline 1; 8, circulation pipeline 1; 9, coating device; 91, buckle; 92, slide rail; 93, base 2; 94, base 1; 95, support frame 1; 96, coating structure; 961, coating valve 1 drive; 962, coating valve seat 1; 963, movable groove 1; 964, coating valve 1; 965, arc groove; 966, coating valve seat 2; 9661, pressure Sensor one; 967, coating valve four; 968, coating valve two; 9681, reflux hole; 9682, pressure sensor two; 9683, arc groove; 969, coating valve three; 971, slide groove; 972, circulation pipeline three; 973, coating valve three drive; 974, coating valve four drive; 975, coating valve two drive; 976, baffle; 97, coating head roller drive; 981, movable groove two; 983, screw; 984, movable groove three; 985, coating valve five; 986, coating valve five drive; 987, support frame two; 10, back roller; 11, coating substrate. DETAILED DESCRIPTION

[0038] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0039] Embodiment 1, as Figure 1 and Figure 2 As shown, a secondary battery thick electrode coating device includes a mounting frame 1, a circulating delivery pump 3, a material delivery pump 4, a filtering device 5, a feed delivery device 6, a feed pipeline 7 and a circulating pipeline 8, the circulating delivery pump 3 and the material delivery pump 4 are fixedly mounted at the rear of the upper end of the mounting frame 1, the filtering device 5 and the feed delivery device 6 are fixed at the middle of the upper end of the mounting frame 1, the filtering device 5 is located between the circulating delivery pump 3 and the feed delivery device 6, and the circulating delivery pump 3, the filtering device 5 and the feed delivery device 6 are connected in series in sequence using a feed pipeline 7;

[0040] The above-mentioned circulating delivery pump 3, material delivery pump 4, filter device 5 and feed delivery device 6 are all conventional designs in the prior art. In the scheme, the filter device 5 can adopt the model: EJS-N type or EJS-W type Yiqing EJS series high viscosity slurry self-cleaning filter;

[0041] In the scheme, the feeding and conveying device 6 can use a screw feeder to feed the materials.

[0042] The slurry in the storage device 2 is extracted through the circulation pump 3 and sequentially passes through the feed pipe 7, the filtering device 5, the feed conveying device 6, the coating device 9, the circulation pipe 8 and the feed conveying pump 4, and finally returns to the storage device 2 again.

[0043] Specifically, during the implementation process, in order to achieve stirring of the slurry and reduce the number of bubbles in the slurry, a storage device 2 is provided at the rear of the mounting frame 1, the output end of the storage device 2 and the feed pump 4 are connected in series through a circulation pipe 8, the output end of the circulation pump 3 is connected to the input end of the storage device 2, and a coating device 9 is slidably provided on the left upper end of the mounting frame 1.

[0044] The storage device 2 includes a storage tank 21, a return pipe and a feed pipe are symmetrically installed on the top 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 position of the top wall 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 lower end of the connecting rod, the input end of the feed delivery pump 4 is connected to the discharge pipe through a circulation pipeline-8, the output end of the circulation delivery pump 3 is connected to the return pipe through a feed pipeline-7, and a valve is installed on the outer surface of the circulation pipeline-8;

[0045] In the above, the material is fed into the inner cavity of the storage tank 21 through the feed pipe, and the slurry in the inner cavity of the storage tank 21 can be extracted through the cooperation of the circulating delivery pump 3, the feed pipe 7 and the discharge pipe;

[0046] During the implementation process, after the slurry is injected into the inner cavity of the storage tank 21, the starter motor 24 can drive the stirring paddle 22 to continuously stir the slurry in cooperation with the connecting rod;

[0047] The unused slurry is pumped back into the inner cavity of the storage tank 21 through the feeding pump 4 for storage and recycling, thereby reducing the waste of raw materials. When not coating, the coating valve 964 can be completely closed and the valve of the circulation pipeline 8 can be opened, so that the slurry can be continuously circulated between the storage tank 21 and the coating cavity arc groove 965 to prevent the slurry from settling.

[0048] The filter device 5 can filter out impurities or particles in the slurry. The feed conveying device 6 conveys the filtered slurry to the coating chamber 1 through a pipeline.

[0049] Embodiment 2: Based on embodiment 1, this embodiment coats the pumped material onto a coating substrate 11 through a coating device 9 .

[0050] Specifically, in order to achieve the above purpose, refer to Figure 4-7In this scheme, the coating device 9 includes a plurality of slide rails 92 installed at the front of the upper end of the mounting frame 1, the outer surfaces of the plurality of slide rails 92 are all slidably provided with buckles 91, the upper ends of the plurality of buckles 91 are commonly fixed with a base 2 93, the upper end of the base 2 93 is provided with a base 1 94, the rear of the base 1 94 is fixed with a plurality of support frames 1 95, the support frames 1 95 and the front ends of the plurality of support frames 1 95 are commonly fixed with a connecting plate, the upper end of the base 1 94 is fixed with a coating structure 96, and the rear end of the base 2 93 is provided with a plurality of coating head roller drivers 97 installed at the upper end of the mounting frame 1;

[0051] By the cooperation between the buckle 91 and the slide rail 92, the base 2 93, the base 1 94 and the plurality of support frames 1 95 can slide at the front of the top of the mounting frame 1 under the drive of the coating head roller drive 97;

[0052] In order to cooperate with the coating structure 96 to move, and to feed and return materials at the same time, the middle parts of the feed pipe 7 and the circulation pipe 8 in this solution are high-pressure hoses, which are used to ensure that the front parts of the feed pipe 7 and the circulation pipe 8 are stable during movement, and the slurry can be normally transmitted;

[0053] The support frame 1 95 mentioned above is used to support the power source inside the coating structure 96, such as the coating valve three drive 973, the coating valve four drive 974 and the coating valve two drive 975, so that it can drive the structure to operate.

[0054] The coating structure 96 includes a coating valve seat 962 fixed to the upper end of the horizontal part of the base 94 and a plurality of coating valve drivers 961 installed at the front of the base 94. A movable groove 963 is provided at the front of the upper end of the coating valve seat 962, and an arc groove 965 is provided at the rear of the upper end of the coating valve seat 962. A plurality of coating valves 964 slide in the inner cavity of the movable groove 963. A coating valve seat is fixed at the middle of the front end of the vertical part of the base 94. Two 966, a baffle plate 976 is slidably arranged in the middle of the upper end of the coating valve seat two 966, a plurality of coating valves two 968 are arranged at the front end of the coating valve four 967, a coating valve three 969 is slidably arranged at the upper end of the coating valve four 967 and the upper ends of the plurality of coating valves two 968, a baffle plate 976 is installed at the left and right parts of the front end of the coating valve four 967, and the two baffle plates 976 are respectively located at the left side of the coating valve two 968 at the leftmost part and the right side of the coating valve two 968 at the rightmost part;

[0055] The plurality of coating valves 1 964 divide the area between the coating valve seat 2 966 and the coating valve seat 1 962 into a front part and a rear part, which are defined as a coating chamber 2 and a coating chamber 1 respectively;

[0056] An arc groove 9683 is provided on the upper part of the outer surface of the coating valve 2 968 facing the back roller 10;

[0057] The cavity between the inner cavity of the arc-shaped groove 9683 and the outer surface of the coating substrate 11 is defined as coating cavity three.

[0058] The width of coating chamber one in the lateral direction is similar to the coating width. The slurry extends laterally in coating chamber one and enters coating chamber two through coating valve one 964. The width of coating valve one 964 is the same as that of coating chamber one. Coating valve one 964 is divided into multiple blocks and arranged continuously in the lateral direction. The gap between coating valve one 964 and coating valve seat two 966 is adjusted to preliminarily control the uniformity of the flow of slurry from coating chamber one to coating chamber two in the lateral direction.

[0059] However, it is inevitable that, viewed horizontally, the flow rate of the slurry from coating chamber 1 to coating chamber 2 is different. When not coating, the coating valve 1 964 can be completely closed, and the valve on the circulation pipe 1 8 can be opened to achieve continuous circulation of the slurry between the storage tank 21 and the coating chamber 1 to prevent the slurry from settling.

[0060] A circulation pipe 3 972 is fixed to the upper end of each of the coating valves 2 968;

[0061] Several circulation pipes three 972 are connected to the circulation pipe one 8, and the unused slurry is refluxed synchronously.

[0062] The upper end of the coating valve 969 is provided with a plurality of chutes 971 corresponding to the circulation pipes 972 on the same side, and the plurality of circulation pipes 972 are respectively located in the inner cavities of the plurality of chutes 971;

[0063] During the implementation process, the horizontal position of the coating valve 3 969 will change, and the coating valve 2 968 and the coating valve 3 969 will also slide relative to each other during the implementation process. In order to allow the excess slurry to be discharged normally from the reflux hole 9681 through the circulation pipe 3 972, the circulation pipe 3 972 must move synchronously with the coating valve 2 968. The slide 971 is provided to prevent the coating valve 3 969 from squeezing the circulation pipe 3 972 during the movement, thereby ensuring the integrity of the circulation pipe 3 972.

[0064] Similarly, the middle parts of several circulation pipes three 972 are also high-strength hoses, which are used to extend the moving path of the circulation pipe three 972.

[0065] There are several coating valves 2 968 and coating valves 3 969 arranged in the direction of substrate movement.

[0066] The input ends of the circulation pipe 8 are installed at the middle of the left end and the middle of the right end of the base 94 and are both connected to the inner cavity of the arc groove 965; when the excess slurry in the coating chamber 1 or the coating valve 964 is closed, the slurry can flow back to the inner cavity of the storage tank 21 through the circulation pipe 8.

[0067] For further information, see Figure 4 and Figure 6 In this scheme, a plurality of coating valve three drivers 973, a plurality of coating valve four drivers 974 and a plurality of coating valve two drivers 975 are installed at the front end of the connecting plate, the output end piston rods of the plurality of coating valve four drivers 974 penetrate the vertical part of the base 94 and are all connected to the rear end of the coating valve four 967, the output end piston rods of the plurality of coating valve two drivers 975 penetrate the vertical part of the base 94 and are respectively connected to the coating valve two 968 on the same side, the plurality of coating valve four drivers 974 are evenly distributed on the left and right sides of the plurality of coating valve two drivers 975, the output end piston rods of the plurality of coating valve three drivers 973 penetrate the vertical part of the base 94 and are commonly connected to the rear end of the coating valve three 969;

[0068] The plurality of coating valve three drivers 973, the plurality of coating valve four drivers 974 and the plurality of coating valve two drivers 975 can respectively control the coating valve three 969, the coating valve four 967 and the coating valve two 968 to move left and right;

[0069] However, when the coating valve four drivers 974 start to operate, the coating valve three drivers 973 need to move synchronously. After the coating valve four 967 moves forward to the specified position, the coating valve two 968 can continue to move forward independently.

[0070] The lower part of the outer surface of the second coating valve 968 facing the back roller 10 is arc-shaped, which further fits the shape formed by the coating substrate 11 bending on the outer surface of the back roller 10, thereby improving the coating effect of the slurry. A second pressure sensor 9682 is installed in the middle of the inner surface of the arc groove 9683, and a reflux hole 9681 communicating with the inner cavity of the third circulation pipe 972 on the same side is opened at the front of the inner surface of the arc groove 9683;

[0071] The lower front end of the coating valve seat 966 is rounded and is equipped with a pressure sensor 9661;

[0072] The lower front end of the coating valve 969 is an arc-shaped, flat, irregular or adjustable structure, which further fits the shape formed by the bending of the coating substrate 11 on the outer surface of the back roller 10, thereby improving the coating effect of the slurry.

[0073] In the above implementation process, the substrate is passed around the back roller 10 and moves with the rotation of the back roller 10 to stabilize the coating state. The slurry fills the coating chamber 2, and the slurry has been coated on the substrate.

[0074] In order to make the slurry fit perfectly on the substrate and solve the problem of foil leakage during coating, refer to Figure 4 In this solution, the lower front end of the coating valve seat 966 is rounded and a plurality of pressure sensors 9661 are installed.

[0075] Pressure sensor 1 9661 feeds back the slurry pressure in coating chamber 2 to the electrical control system. The system performs P1D adjustment according to the actual pressure and the set pressure, controls the slurry flow rate delivered to coating chamber 1 by the feed conveying device 6, and stabilizes the pressure of coating chamber 2 within the set pressure range of the system.

[0076] As the back roller 10 carries the coating substrate 11 and the coating substrate 11 carries the slurry adhered to its surface and moves toward the coating chamber 3, this is equivalent to increasing the power of continuous slurry delivery inside the die head, solving the problem of excessive delivery pressure for coating high-viscosity slurry;

[0077] The coating substrate 11 carries the slurry and moves from the coating chamber 2 to the coating chamber 3, passing through the coating valve 2 968. Figure 7 As shown, multiple coating valves 967 are closely arranged in parallel and combined into a target coating width.

[0078] The coating valve 2 968 can be supported by the coating valve 4 967, and driven by the coating valve 1 964 and the arc groove 965 to move toward the back roller 10 to adjust the gap between the coating valve 2 968 and the substrate.

[0079] During coating, the slurry passes through the gap between the coating valve 968 and the substrate. Under the same coating speed, different gaps in the lateral direction are controlled to control the uniform distribution of flow in the lateral direction.

[0080] When the slurry passes through coating valve 1 964, the lateral flow velocity of the slurry is different. From the rheological properties of the slurry, it can be seen that the lateral flow distribution of the slurry is different. When the slurry passes through the gap between coating valve 2 968 and the substrate, the appropriate gap is adjusted so that the lateral flow of the slurry tends to be consistent when it passes through coating valve 2 968 and reaches coating chamber 3.

[0081] This solution also provides four baffles 976, which are respectively installed on both sides of the coating chamber 2 and the coating chamber 3. The baffles 976 control the width of the slurry on the coating substrate 11, so that the slurry is limited to the target coating width area from a lateral perspective.

[0082] When high-viscosity slurry of the same viscosity reaches the coating chamber three, the lateral pressure can be balanced in the coating chamber three.

[0083] This solution also installs a valve between the circulation pipe three 972 and the circulation pipe one 8.

[0084] When the valve on the circulation pipe 3 972 is closed, the coating valve 4 driver 974 and the coating valve 2 driver 975 are controlled to operate, driving the coating valve 4 967 and the coating valve 2 968 to move, and the gap between the coating valve 2 968 and the coating substrate 11 is appropriately adjusted, thereby obtaining a good slurry flow uniformity effect;

[0085] Under the closed-loop control of the control system, the pressure of coating chamber 3 can be stabilized within the set range. When it is detected that the lateral upper pressure in coating chamber 3 is too large and the adjustment gap affects the slurry uniformity effect, it is necessary to adjust the opening of the valve on the corresponding position circulation pipeline 3 972 to balance the slurry pressure in coating chamber 3.

[0086] After the high-viscosity slurry is processed for flow consistency and pressure stabilization, it passes through the gap between the coating valve 969 and the coating substrate 11 to form a stable electrode that reaches the target thickness.

[0087] Since high-viscosity slurry is not easy to flow, the coating device can stably achieve the coating of thick electrode sheets.

[0088] In this solution, coating valve four drive 974, coating valve two drive 975, coating head roller drive 97, coating valve three drive 973 and coating valve one drive 961 can use one of electric cylinders, air cylinders or hydraulic cylinders during implementation, as long as the thrust generated meets the production requirements.

[0089] A coating head lateral movement driving device is installed between the base 2 93 and the base 1 94 .

[0090] The above-mentioned lateral driving device is a conventional design in the prior art, and is composed of a concave fixed base plate, a threaded rod and a servo motor, wherein the base 1 94 is threadedly connected to the threaded rod and slidably connected to the concave fixed base plate, the concave fixed base plate is installed at the upper end of the base 2 93, the threaded 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 the threaded rod to rotate, thereby realizing the lateral movement of the coating structure 96, etc.

[0091] Embodiment 3: In this embodiment, a replacement scheme 1 is also made for the coating device 9, such as Figure 8 As shown, in this solution, the shape of the arc groove 965 is changed, and a second movable groove 981 and a screw 983 are added on the basis of the first and second embodiments. The remaining structural installation methods and installation positions are the same as those of the first and second embodiments.

[0092] Similarly, a movable groove 2 981 communicating with each other is provided at the upper front part of the coating valve 3 969, and a plurality of screws 983 are equidistantly connected to the inner cavity of the movable groove 2 981 on the side close to the back roller 10, and the plurality of screws 983 extend to the outside through the inner cavity of the movable groove 2 981 away from the back roller 10 and are rotatably connected to the side of the coating valve 3 969 away from the back roller 10;

[0093] During implementation, by rotating the screw 983 in the forward or reverse direction, the angle of the coating valve 3 969 close to the coating substrate 11 can be changed, and the straightness of the slurry on the coating substrate 11 can be corrected to improve the coating quality.

[0094] Embodiment 4: In this embodiment, a second replacement scheme is also made for the coating device 9, such as Fig. 9 As shown, in this embodiment, the installation positions of the coating valve 1 driver 961 and the coating valve 1 964 are changed from the original vertical orientation to the horizontal orientation. The coating valve 1 driver 961 and the coating valve 1 964 are located in the same horizontal plane and are both at the bottom of the coating valve 4 driver 974. On the basis of the first and second embodiments, the movable groove 3 984, the coating valve 5 985, the coating valve 5 driver 986 and the supporting frame 2 987 are newly added. The installation method and installation position of the remaining structures are the same as those of the first and second embodiments.

[0095] Depend on Fig. 9 It can be seen that the side of the coating valve 964 close to the coating substrate 11 is arc-shaped, which is used to improve the smoothness of the slurry during the flow process;

[0096] The installation positions of several coating valves-driving 961 can all be installed on the support frame-95;

[0097] Specifically, a movable groove three 984 is provided at the front end of the coating valve three 969, and a plurality of laterally distributed coating valves five 985 are slidably arranged in the inner cavity of the movable groove three 984. A coating valve five driver 986 is installed in the middle of a side of the plurality of coating valves five 985 away from the coating substrate 11, and a support frame two 987 is fixed between the rear ends of the plurality of coating valve five drivers 986 and the coating valve three 969.

[0098] In this solution, the coating valve five-drive 986 can use an electric cylinder, a pneumatic cylinder or a hydraulic cylinder during implementation, as long as the thrust generated meets the production requirements.

[0099] In this embodiment, by adding a plurality of coating valves 5 985 and adjusting the extension lengths of the plurality of coating valves 5 985 respectively under the drive of the coating valve 5 driver 986, the straightness of the slurry on the coating substrate 11 can be corrected to improve the coating quality.

[0100] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A secondary battery thick electrode coating device, comprising a mounting frame (1), a circulation delivery pump (3), a material delivery pump (4), a filtering device (5), a feed delivery device (6), a feed pipeline (7) and a circulation pipeline (8), characterized in that: The circulating delivery pump (3) and the material delivery pump (4) are both fixedly mounted on the rear portion of the upper end of the mounting frame (1); the filtering device (5) and the material feeding delivery device (6) are both fixedly mounted on the middle portion of the upper end of the mounting frame (1); the filtering device (5) is located between the circulating delivery pump (3) and the material feeding delivery device (6); and the circulating delivery pump (3), the filtering device (5) and the material feeding delivery device (6) are connected in series in sequence using a material feeding pipeline (7); A material storage device (2) is provided at the rear of the mounting frame (1); the output end of the material storage device (2) and the material delivery pump (4) are connected in series via a circulation pipeline (8); the output end of the circulation delivery pump (3) is connected to the input end of the material storage device (2); and a coating device (9) is slidably provided on the left upper end of the mounting frame (1).

2. A secondary battery thick electrode coating device according to claim 1, characterized in that: The material storage device (2) comprises a material storage tank (21), a return pipe and a feed pipe are symmetrically installed on the top of the material storage tank (21) in front and back directions, a discharge pipe is installed on the bottom of the material storage tank (21), a motor (24) is installed in the middle of the top wall of the material 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 lower end of the connecting rod, the input end of the material delivery pump (4) is connected to the discharge pipe by using a circulation pipeline (8), and the output end of the circulation delivery pump (3) is connected to the return pipe by using a feed pipeline (7).

3. A secondary battery thick electrode coating device according to claim 1, characterized in that: The coating device (9) comprises a plurality of slide rails (92) mounted on the front of the upper end of the mounting frame (1), the outer surfaces of the plurality of slide rails (92) are all provided with sliding buckles (91), the upper ends of the plurality of buckles (91) are commonly fixed with a base 2 (93), the upper end of the base 2 (93) is provided with a base 1 (94), the rear part of the base 1 (94) is fixed with a plurality of support frames 1 (95), the front ends of the support frames 1 (95) and the plurality of support frames 1 (95) are commonly fixed with a connecting plate, the upper end of the base 1 (94) is fixed with a coating structure (96), and the rear end of the base 2 (93) is provided with a plurality of coating head roller drives (97) mounted on the upper end of the mounting frame (1).

4. A secondary battery thick electrode coating device according to claim 3, characterized in that: The coating structure (96) comprises a coating valve seat (962) fixed to the upper end of the horizontal part of the base (94) and a plurality of coating valve drivers (961) installed at the front of the base (94), a movable groove (963) is provided at the front of the upper end of the coating valve seat (962), an arc-shaped groove (965) is provided at the rear of the upper end of the coating valve seat (962), a plurality of coating valves (964) are slidably arranged in the inner cavity of the movable groove (963), and a coating valve seat (962) is fixed at the middle of the front end of the vertical part of the base (94). (966), a baffle (976) is slidably arranged in the middle of the upper end of the coating valve seat 2 (966), a plurality of coating valves 2 (968) are arranged at the front end of the coating valve 4 (967), a coating valve 3 (969) is slidably arranged at the upper end of the coating valve 4 (967) and the upper ends of the plurality of coating valves 2 (968), a baffle (976) is installed at the left and right parts of the front end of the coating valve 4 (967), and the two baffles (976) are respectively located at the left side of the coating valve 2 (968) at the leftmost part and the right side of the coating valve 2 (968) at the rightmost part; A circulation pipe 3 (972) is fixed on the upper end of each of the coating valves 2 (968); The coating valve 3 (969) has a plurality of slide grooves (971) at the upper end thereof corresponding to the circulation pipe 3 (972) on the same side, and the plurality of circulation pipes 3 (972) are respectively located in the inner cavities of the plurality of slide grooves (971); The coating valve 2 (968) and the coating valve 3 (969) are arranged in a plurality in the direction of substrate movement. The input ends of the circulation pipe 1 (8) are installed at the middle of the left end and the middle of the right end of the base 1 (94) and are both connected to the inner cavity of the arc-shaped groove (965).

5. A secondary battery thick electrode coating device according to claim 4, characterized in that: A plurality of coating valve three drives (973), a plurality of coating valve four drives (974) and a plurality of coating valve two drives (975) are installed at the front end of the connecting plate. The output end piston rods of the plurality of coating valve four drives (974) penetrate the vertical part of the base one (94) and are all connected to the rear end of the coating valve four (967). The output end piston rods of the plurality of coating valve two drives (975) penetrate the vertical part of the base one (94) and are respectively connected to the coating valve two (968) on the same side. The plurality of coating valve four drives (974) are evenly distributed on the left and right sides of the plurality of coating valve two drives (975). The output end piston rods of the plurality of coating valve three drives (973) penetrate the vertical part of the base one (94) and are collectively connected to the rear end of the coating valve three (969).

6. A secondary battery thick electrode coating device according to claim 5, characterized in that: The lower part of the outer surface of the coating valve No. 2 (968) facing the back roller (10) is arc-shaped, and the upper part of the outer surface of the coating valve No. 2 (968) facing the back roller (10) is provided with an arc-shaped groove (9683), and the middle part of the inner surface of the arc-shaped groove (9683) is installed with a pressure sensor No. 2 (9682), and the front part of the inner surface of the arc-shaped groove (9683) is provided with a reflux hole (9681) that communicates with the inner cavity of the circulation pipe No. 3 (972) on the same side.

7. A secondary battery thick electrode coating device according to claim 4, characterized in that: The lower front end of the coating valve seat 2 (966) is rounded and is installed with a pressure sensor 1 (9661).

8. A secondary battery thick electrode coating device according to claim 4, characterized in that: The lower front end of the coating valve 3 (969) is an arc-shaped, flat, special-shaped or adjustable structure.

9. A secondary battery thick electrode coating device according to claim 3, characterized in that: A coating head lateral movement driving device is installed between the base 2 (93) and the base 1 (94).

Images