Lithium battery diaphragm slurry processing device

Abstract

The utility model relates to a kind of lithium battery diaphragm slurry processing device for making pulp, sequentially including premixing tank, ultrasonic dispersion device and finished product tank;Ultrasonic dispersion device is pipeline structure, and several ultrasonic transducer arrays are equipped on the outside of the tube wall of its ultrasonic dispersion pipeline;Between ultrasonic dispersion device and finished product tank, there is also provided with filtering module;Electromagnetic adsorption component and filtering component are sequentially provided in the filter cavity of filtering module along slurry flow direction. The utility model replaces traditional batch sanding and high-speed dispersion with pipeline ultrasonic dispersion, slurry is completed efficient dispersion and "soft grinding" in continuous conveying process, material transfer and waiting time are saved, production cycle is greatly shortened, and energy consumption is reduced. The whole system can be designed as continuous feeding and discharging, and production efficiency is significantly improved.

Description

Technical Field

[0001] This utility model relates to the technical field of lithium battery separator processing, and in particular to a lithium battery separator slurry preparation and processing device. Background Technology

[0002] In the production of lithium-ion batteries, the preparation of the separator slurry is a crucial step. The separator slurry is usually composed of a base resin (such as polyethylene or polypropylene), ceramic particles, binders, and solvents. Its uniformity, dispersion, and purity directly affect the pore size distribution, mechanical strength, thermal stability, and battery safety performance of the coated separator.

[0003] Currently, the mainstream diaphragm slurry preparation process generally adopts a batch production method of "premixing-mechanical grinding / dispersion". A typical process is as follows: various powder and liquid raw materials are added to a premixing tank for initial stirring and wetting; then the premixed slurry is transferred to a sand mill or high-speed disperser for grinding and shear dispersion to achieve the required fineness and uniformity; finally, the slurry is transferred to a finished product tank for later use or for subsequent filtration to remove impurities. This traditional process has the following significant drawbacks: Materials need to be transferred, waited for, and processed multiple times between several independent devices. In particular, the mechanical grinding and dispersion stages are time-consuming and rely on high-power motors, resulting in long production cycles per batch and high energy consumption per unit.

[0004] Metal (such as iron, stainless steel) or non-metal (such as ceramics, polymers) debris generated by equipment wear can directly mix into the slurry system. These hard foreign objects can easily puncture the separator during subsequent coating and battery assembly, causing micro-short circuits inside the battery. This poses a significant risk of thermal runaway, battery failure, or even fire and explosion.

[0005] In view of the above-mentioned shortcomings, the designer has actively researched and innovated in order to create a lithium battery separator slurry preparation and processing device, which will make it more industrially valuable. Utility Model Content

[0006] To solve the above-mentioned technical problems, the purpose of this utility model is to provide a lithium battery separator slurry preparation and processing device.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: A lithium battery separator slurry preparation and processing device, comprising a premixing tank, an ultrasonic dispersion device, and a finished product tank in sequence; The ultrasonic dispersion device is a pipe-type structure, with several ultrasonic transducer arrays installed on the outer side of the pipe wall of its ultrasonic dispersion pipe. A filter module is also installed between the ultrasonic dispersion device and the finished product tank; An electromagnetic adsorption component and a filter component are sequentially arranged in the filter chamber of the filter module along the slurry flow direction.

[0008] As a further improvement of this utility model, guide ribs are provided on the inner side of the wall of the ultrasonic dispersion pipe, and the guide ribs are distributed in a spiral or intermittent convex shape.

[0009] As a further improvement of this utility model, the filter assembly is a two-stage switchable structure, including a first filter branch and a second filter branch arranged in parallel. The first filter branch and the second filter branch are respectively equipped with filter elements of different precision and a first valve and a second valve for controlling their on / off state.

[0010] As a further improvement of this utility model, the filter assembly includes a first filter branch and a second filter branch arranged in series. The first filter branch and the second filter branch are respectively equipped with filter elements of different precision and a first valve and a second valve for controlling their on / off state.

[0011] As a further improvement of this utility model, the filter element precision of the first filtration branch is 50~150μm, and the filter element precision of the second filtration branch is 10~50μm.

[0012] As a further improvement of this utility model, the electromagnetic adsorption component includes a non-magnetic pipe and an electromagnetic coil wound around the outer wall of the pipe, the electromagnetic coil being electrically connected to a pulse power supply.

[0013] As a further improvement of this utility model, it also includes a bubble removal module, which is disposed between the ultrasonic dispersion device and the filter module. The bubble removal module is a vacuum degassing tank or an online degasser.

[0014] As a further improvement of this utility model, the premix tank, ultrasonic dispersion device, bubble removal module, filter module and finished product tank are connected together by a conveying pipeline, and a continuous conveying pump is installed on the conveying pipeline. The continuous conveying pump is a hose pump or a diaphragm pump.

[0015] By means of the above solution, this utility model has at least the following advantages: This invention employs pipeline ultrasonic dispersion to replace traditional batch-type sand milling and high-speed dispersion. The slurry undergoes efficient dispersion and "soft grinding" during continuous transport, eliminating material transfer and waiting time, significantly shortening the production cycle and reducing energy consumption. The entire system can be designed for continuous feeding and discharging, resulting in a significant improvement in production efficiency.

[0016] The ultrasonic dispersion of this invention is a "non-contact" energy action method. The slurry only comes into contact with the inner wall of the pipe, which completely avoids the severe wear caused by high-speed rotating metal impellers or abrasive media, and fundamentally eliminates the main sources of metal and hard foreign matter contamination in the process.

[0017] This invention integrates a combined online impurity removal module of "electromagnetic adsorption + physical filtration" directly after the dispersion process. Electromagnetic adsorption can efficiently remove ferromagnetic foreign matter that may be introduced from raw materials or previous processes. The subsequent multi-stage filtration can reliably intercept non-magnetic impurities and incompletely dispersed agglomerates. This integrated design ensures that the slurry reaches a high purity standard at the time of production.

[0018] This invention integrates dispersion and impurity removal functions into a compact process, eliminating the need for a separate post-treatment filtration system and its associated pumps, valves, pipelines, and control units. This simplifies equipment layout and reduces floor space, equipment investment, and subsequent maintenance costs.

[0019] The above description is only an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, the following are the preferred embodiments of this utility model and are described in detail with reference to the accompanying drawings. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a structural diagram of existing technology; Figure 2 This is a schematic diagram of the structure of a lithium battery separator slurry preparation and processing device according to the present invention; Figure 3 yes Figure 1 A partial structural diagram of the ultrasonic dispersion pipeline in a medium-sized ultrasonic dispersion device. Figure 4 yes Figure 1 A partial structural diagram of the filter chamber of the intermediate filter module.

[0022] The meanings of the labels in the figures are as follows.

[0023] 1. Premix tank; 2. Ultrasonic dispersion device; 3. Finished product tank; 4. Bubble removal module; 5. Filtration module; Ultrasonic dispersion pipe 21, flow guide rib 22; Filter chamber 51, electromagnetic adsorption component 52, filter component 53. Detailed Implementation

[0024] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit its scope.

[0025] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0026] The first embodiment of this utility model: like Figure 1 The existing technical solutions generally include a premix tank 1, an ultrasonic dispersion device 2, and a finished product tank 3 in sequence according to the slurry processing order.

[0027] like Figures 2-4 As shown in the figure, this embodiment is a lithium battery separator slurry preparation and processing device, which also includes a premix tank 1, an ultrasonic dispersion device 2 and a finished product tank 3 in the slurry processing sequence.

[0028] The ultrasonic dispersion device 2 adopts a pipeline structure design. Specifically, several ultrasonic transducer arrays for generating high-intensity ultrasonic fields are arranged on the outer side of the core ultrasonic dispersion pipeline 21.

[0029] In order to optimize the flow and dispersion of slurry in the pipeline, guide ribs 22 are specially provided on the inner side of the ultrasonic dispersion pipeline 21. These guide ribs 22 are distributed in a spiral or intermittent convex shape to disturb the flow of slurry.

[0030] A filtration module 5 for purifying the slurry is also provided on the process route between the ultrasonic dispersion device 2 and the finished product tank 3. Inside the filtration chamber 51 of the filtration module 5, an electromagnetic adsorption component 52 and a filtration component 53 are arranged sequentially along the direction in which the slurry must flow. The electromagnetic adsorption component 52 is mainly composed of a section of non-magnetic pipe and an electromagnetic coil tightly wound around the outer wall of the pipe. The electromagnetic coil needs to be electrically connected to a pulse power supply that can generate an intermittent strong magnetic field.

[0031] The filter assembly 53 offers two optional implementation structures. The first is a two-stage switchable structure, which includes a first filter branch and a second filter branch arranged in parallel. The first filter branch and the second filter branch are respectively equipped with filter elements of different precision and a first valve and a second valve that independently control the opening and closing of their branches.

[0032] The second structure includes a first filter branch and a second filter branch connected in series. Similarly, these two series branches are also equipped with filter elements of different precision and valves for controlling the on / off state.

[0033] Typically, the filter cartridges used in the first filtration branch have a precision range of 50 to 150 microns and are mainly used to intercept larger particles, while the filter cartridges used in the second filtration branch have a precision range of 10 to 50 microns and are used to achieve fine filtration.

[0034] In addition, a bubble removal module 4 is added between the ultrasonic dispersion device 2 and the filter module 5. The bubble removal module 4 can be either a vacuum degassing tank or an online degassing device, used to remove tiny bubbles in the slurry.

[0035] All the aforementioned core components, namely the premix tank 1, ultrasonic dispersion device 2, bubble removal module 4, filtration module 5, and finished product tank 3, are connected together through conveying pipelines to form a continuous processing system.

[0036] To drive the slurry to flow throughout the system, a continuous delivery pump is installed on the delivery pipeline. This continuous delivery pump is preferably a low-pollution pump type such as a hose pump or a diaphragm pump.

[0037] The second embodiment of this utility model: like Figures 2-4 As shown, this embodiment, following the slurry flow sequence, mainly includes a premixing tank 1, a continuous conveying pump (not shown separately in the figure, but integrated into the pipeline), an ultrasonic dispersion device 2, a bubble removal module 4, a filtration module 5, and a finished product tank 3. All units are connected by sealed pipelines to form a continuously operating processing system.

[0038] Premixing tank 1: The top is equipped with a feeding port and a solvent addition port. The tank is equipped with a low-speed stirrer for preliminary impregnation and mixing of polyethylene powder, alumina ceramic powder, PVDF binder, and N-methylpyrrolidone (NMP) solvent to form a uniform suspension. The stirring paddle can be made of coated or non-metallic material.

[0039] Ultrasonic dispersion device 2: This is the core of the device. Its main body is a straight pipe section, namely ultrasonic dispersion pipe 21, placed horizontally or vertically. This pipe is made of a corrosion-resistant metal that can conduct sound waves well (such as 316L stainless steel). On the outer wall of the pipe, multiple high-power piezoelectric ceramic ultrasonic transducers are installed in an array at certain intervals and driven by a unified ultrasonic generator. The working frequency can be adjusted between 20kHz and 40kHz. The key improvement is that continuous single-headed spiral guide ribs 22 are machined on the inner wall of the pipe 21, with a spiral angle of about 30 degrees. When the slurry flows through, this structure can force the slurry to generate a combined rotational forward motion, forming strong turbulence, thereby ensuring that the slurry particles will not "stick to the wall" or "short-circuit" and flow away, but are fully exposed in the ultrasonic field to undergo cavitation, shearing and other effects, achieving the ultimate dispersion of nano-sized ceramic particles in the resin solution.

[0040] Bubble Removal Module 4: Located after ultrasonic dispersion, this module employs an online debubbler. It features a special flow channel and vacuum chamber. The slurry flows through in thin film form, and under negative pressure, dissolved microbubbles and ultrasonically generated microbubbles are rapidly removed.

[0041] Filter module 5: This is another core component of the device. Its filter chamber 51 is divided into front and rear sections.

[0042] The front-end installation of electromagnetic adsorption component 52: This uses an alumina ceramic pipe with the same inner diameter as the main pipe as a non-magnetic pipe, with a water-cooled electromagnetic coil tightly wound around its outer wall. The coil is connected to a pulse power supply, generating a pulsed magnetic field with a peak intensity exceeding 1.2 Tesla during operation, strongly adsorbing micron-sized ferromagnetic impurities that may be present in the slurry. The rear-end installation of parallel two-stage switchable filter component 53: This has two parallel filter branches, A and B.

[0043] Branch A (first filtration branch) is equipped with a 100μm precision stainless steel sintered mesh filter element, and its inlet is equipped with a pneumatic ball valve (first valve); Branch B (second filtration branch) is equipped with a 25μm precision stainless steel sintered mesh filter element, and its inlet is equipped with a pneumatic ball valve (second valve). The outlets of the two branches merge. A control system allows for the arbitrary opening or closing of one branch or switching between them.

[0044] Power supply: A flexible hose pump is installed as a continuous delivery pump on the main pipeline from the premix tank outlet to the ultrasonic dispersion unit inlet. Its core delivery component is a section of wear-resistant silicone hose, completely eliminating metal contamination of the slurry by the pump body. The pump speed is adjustable to control the overall system flow rate.

[0045] Finished product tank 3: Receives the final slurry. Low-speed stirring can be installed inside the tank to prevent sedimentation.

[0046] The working process of this embodiment: Preparation and feeding: According to the formula, put all the solid powders and some liquids required for the diaphragm slurry into the premixing tank 1, start the agitator in the tank for low-speed premixing, and form the initial slurry.

[0047] Start-up and continuous processing: Start the hose pump and ultrasonic dispersion device 2. The slurry in the premix tank is pumped at a constant speed into the ultrasonic dispersion pipeline 21 by the hose pump.

[0048] Ultrasonic dispersion: As the slurry flows through pipe 21, it is guided by the internal spiral guide ribs 22 to form turbulent flow, while simultaneously being subjected to high-intensity ultrasonic waves generated by the ultrasonic transducer array outside the pipe wall. The cavitation effect of the ultrasonic waves generates instantaneous high-temperature, high-pressure micro-jets, which efficiently break up and disperse the particle agglomerates in the slurry, achieving an effect similar to "grinding". This process involves no mechanical contact and no wear.

[0049] Degassing: The dispersed slurry enters the online degasser 4, where microbubbles are removed under vacuum to obtain a dense slurry.

[0050] Online impurity removal: The deaerated slurry enters the filtration module 5. It first flows through the electromagnetic adsorption component 52, where any ferromagnetic particles in the slurry are strongly adsorbed onto the inner wall of the ceramic pipe. The slurry then enters the filtration zone. In the initial stages of production, the valve of branch A (100μm) can be opened for preliminary filtration, intercepting large particles and protecting branch B, which may be used later. When higher purity is required or the pressure difference in branch A is too high, the control system can automatically switch to branch B (25μm) for fine filtration. The filtered impurities are retained within the filter element.

[0051] Finished product collection: Finally, the clean, uniform, high-quality diaphragm slurry, which has undergone multiple processes of dispersion, degassing, demagnetization, and filtration, is continuously transported to finished product tank 3 for storage and can be directly supplied to the diaphragm coating production line.

[0052] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0053] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0054] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A lithium battery separator slurry preparation and processing device, comprising, in sequence, a premixing tank (1), an ultrasonic dispersion device (2), and a finished product tank (3); Its features are: The ultrasonic dispersion device (2) is a pipe structure, and several ultrasonic transducer arrays are provided on the outside of the pipe wall of its ultrasonic dispersion pipe (21). A filter module (5) is also provided between the ultrasonic dispersion device (2) and the finished product tank (3); An electromagnetic adsorption component (52) and a filter component (53) are sequentially arranged in the filter chamber (51) of the filter module (5) along the slurry flow direction.

2. The lithium battery separator slurry preparation and processing apparatus as described in claim 1, characterized in that, A flow guiding rib (22) is provided on the inner side of the wall of the ultrasonic dispersion pipe (21), and the flow guiding rib (22) is distributed in a spiral or intermittent protrusion shape.

3. The lithium battery separator slurry preparation and processing apparatus as described in claim 1, characterized in that, The filter assembly (53) has a two-stage switchable structure, including a first filter branch and a second filter branch arranged in parallel. The first filter branch and the second filter branch are respectively equipped with filter elements of different precision and a first valve and a second valve for controlling their opening and closing.

4. The lithium battery separator slurry preparation and processing apparatus as described in claim 1, characterized in that, The filter assembly (53) includes a first filter branch and a second filter branch arranged in series. The first filter branch and the second filter branch are respectively equipped with filter elements of different precision and a first valve and a second valve for controlling their opening and closing.

5. The lithium battery separator slurry preparation and processing apparatus as described in claim 4, characterized in that, The filter element of the first filtration branch has a filter element precision of 50~150μm, and the filter element of the second filtration branch has a filter element precision of 10~50μm.

6. The lithium battery separator slurry preparation and processing apparatus as described in claim 1, characterized in that, The electromagnetic adsorption component (52) includes a non-magnetic pipe and an electromagnetic coil wound around the outer wall of the pipe, the electromagnetic coil being electrically connected to a pulse power supply.

7. The lithium battery separator slurry preparation and processing apparatus as described in claim 1, characterized in that, It also includes a bubble removal module (4), which is located between the ultrasonic dispersion device (2) and the filter module (5). The bubble removal module (4) is a vacuum degassing tank or an online degassing device.

8. The lithium battery separator slurry preparation and processing apparatus as described in claim 1, characterized in that, The premix tank (1), ultrasonic dispersion device (2), bubble removal module (4), filter module (5) and finished product tank (3) are connected together by a conveying pipeline. A continuous conveying pump is installed on the conveying pipeline. The continuous conveying pump is a hose pump or a diaphragm pump.

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