A dry electrode manufacturing method and apparatus thereof

Abstract

The present application relates to a kind of dry electrode manufacturing method and its device.The dry electrode manufacturing method, the method includes the following steps: obtaining the thickness data of material film;Based on the thickness data of material film, obtain adjustment data;Wherein, the adjustment data includes the gap adjustment data of pressure roller, the rotational speed adjustment data of dosing shaft and the rotational speed adjustment data of feed shaft;Based on adjustment data adjustment pressure roller's gap, the rotational speed of dosing shaft and the rotational speed of feed shaft.As the further optimization scheme of the present application, obtain the volume data of material film in production per unit time;Obtain the consumption volume data of powder per unit time;Obtain the production efficiency data of unit time;Obtain the feeding data of dosing shaft surface;The dry electrode manufacturing method and its device, the thickness of product in production realizes automatic closed-loop control adjustment, realizes continuous adjustment without stopping, greatly improves product quality.

Description

Technical Field

[0001] This invention belongs to the field of dry electrode preparation technology, specifically relating to a dry electrode manufacturing method and apparatus. Background Technology

[0002] Common electrode preparation methods include dry and wet methods, with wet electrode preparation being more prevalent. This involves thoroughly dispersing or stirring solid powder in water or an organic solvent to form a slurry or paste, coating it onto a current collector, and then drying it to form the electrode. Some electrodes require re-compacting after drying. The advantages of wet preparation are easy material mixing, convenient coating, and ease of large-scale production. Therefore, it is widely used in current lithium-ion, lead-acid, and alkaline batteries and is the mainstream production process. However, wet electrode preparation also has disadvantages, such as energy wastage during drying; potential environmental pollution if organic solvents are used; and the possibility of some materials dissolving or undergoing chemical reactions under the influence of solvents.

[0003] Dry electrode fabrication typically involves first preparing a self-supporting membrane and then bonding it to both sides of the current collector. This process is relatively complex and prone to uneven powder mixing, affecting electrode quality. Existing technologies often use a mixer, feed channel, and pre-pressing rollers to press the powder into a film. The film thickness is controlled by adjusting the gap between the pre-pressing rollers. However, this method has poor adjustment efficiency and cannot achieve precise control without stopping the machine. Summary of the Invention

[0004] The purpose of this invention is to provide a dry electrode manufacturing method and apparatus with a simple structure and reasonable design in order to solve the above-mentioned problems.

[0005] The present invention achieves the above objectives through the following technical solutions:

[0006] The first aspect of this invention provides a dry electrode manufacturing method, the method comprising the following steps:

[0007] Obtain the thickness data of the film;

[0008] Adjustment data is obtained based on the thickness data of the film.

[0009] The adjustment data includes the gap adjustment data of the pressure roller, the speed adjustment data of the metering shaft, and the speed adjustment data of the feeding shaft;

[0010] Adjust the gap of the pressure roller, the rotation speed of the metering shaft, and the rotation speed of the feeding shaft based on the adjustment data.

[0011] As a further optimization of the present invention, the volume data of the film produced per unit time is obtained;

[0012] Obtain data on the volume of powder consumed per unit time;

[0013] Obtain production efficiency data per unit time;

[0014] Obtain feeding data from the surface of the quantitative shaft;

[0015] Based on the data of powder consumption volume per unit time, production efficiency per unit time, and feeding data on the surface of the metering shaft, the speed adjustment data of the metering shaft is obtained.

[0016] As a further optimization of the present invention, the film volume data V = H × (W + 2a) × L × 1000;

[0017] Where H is the thickness of the film, W is the width of the film, L is the production efficiency per unit time, and a is the single-sided cutting amount of the film.

[0018] Based on the production film volume data V per unit time and the powder consumption volume data V1 per unit time, the conversion coefficient K1 = V1 / V of the powder material required to produce a unit volume of film is obtained.

[0019] The feeding data of the quantitative shaft surface includes the cross-sectional area S1 of the quantitative pit on the quantitative shaft surface and the set data B1;

[0020] The rotational speed adjustment data of the quantitative shaft is ΔM1 = 1000K1ΔHL / B1S1.

[0021] As a further optimization of the present invention, the rotational speed ratio data between the metering shaft and the feeding shaft is obtained, and the rotational speed adjustment data of the feeding shaft is obtained based on the rotational speed adjustment data of the metering shaft and the rotational speed ratio data.

[0022] As a further optimization of the present invention, the rotational speed adjustment data of the feeding shaft is ΔM2=ΔM1 / K2=1000K1ΔHL / B1S1K2;

[0023] Wherein, K2 is the rotational speed ratio between the metering shaft and the feeding shaft.

[0024] As a further optimization of the present invention, the amount of powder stored between the pressure rollers of the film is obtained;

[0025] Obtain the limit value of powder inventory; wherein, the limit value includes the maximum limit value, the minimum limit value, and the standard value;

[0026] The pressure roller is activated when the powder content is greater than or equal to the standard value.

[0027] When the powder inventory is greater than or equal to the maximum limit, the powder output amount is reduced.

[0028] When the powder inventory is less than or equal to the minimum limit value, the powder output amount is increased.

[0029] A second aspect of the present invention provides a dry electrode manufacturing apparatus, the apparatus comprising at least two sets of pressure rollers with a gap between them, the pressure rollers being connected to a first driving device, the first driving device adjusting the gap between the pressure rollers; a feeding mechanism being disposed above the pressure rollers, the feeding mechanism comprising a feeding shaft and a metering shaft, the rotational speeds of the feeding shaft and the metering shaft being adjustable, the feeding shaft being disposed above the metering shaft, the feeding shaft comprising a circular shaft, the surface of the circular shaft being provided with a plurality of uniformly arranged blades, a feeding cavity being formed between adjacent blades, the surface of the metering shaft being provided with metering recesses, and both the feeding shaft and the metering shaft being connected to a second driving device, the second driving device adjusting the rotational speeds of the feeding shaft and the metering shaft.

[0030] As a further optimization of the present invention, a sensor is provided in the middle of the pressure roller, and a control module is connected to the output end of the sensor. The control module controls the first drive mechanism and the second drive mechanism respectively.

[0031] The beneficial effects of this invention are as follows: the product thickness of the entire equipment is automatically controlled and adjusted in a closed loop, enabling continuous machine adjustment without stopping, which greatly improves product quality and reduces the workload of machine adjustment. It is also simpler for customers to use, maintain, and provide after-sales service. Attached Figure Description

[0032] Figure 1 This is a flowchart of a dry electrode manufacturing method according to the present invention;

[0033] Figure 2 This is a schematic diagram of the overall structure of a dry electrode manufacturing apparatus according to the present invention;

[0034] Figure 3 This is a schematic diagram of the feeding structure within a dry electrode manufacturing apparatus according to the present invention.

[0035] Figure 4 This is a schematic diagram of the feeding structure of a dry electrode manufacturing apparatus according to the present invention.

[0036] In the diagram: 1. Pressure roller; 2. Metering shaft; 201. Metering recess; 3. Feeding shaft; 301. Round shaft; 302. Blade; 4. Feeding mechanism; 5. Sensor; 6. Edge trimming device; 7. Thickness detection equipment. Detailed Implementation

[0037] The present application will now be described in further detail with reference to the accompanying drawings. It should be noted that the following specific embodiments are only used to further illustrate the present application and should not be construed as limiting the scope of protection of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application based on the above application content.

[0038] refer to Figure 1 The diagram illustrates a method for manufacturing a dry electrode. This embodiment provides a method for manufacturing a dry electrode, which includes the following steps:

[0039] Step S102: Based on product requirements, the thickness data of the film can be obtained; based on capacity requirements, the production efficiency data per unit time can be obtained.

[0040] Step S104: Based on the thickness data of the film, obtain adjustment data; that is, when the thickness data of the film changes, it is necessary to adjust the entire production system by obtaining the corresponding adjustment data.

[0041] The adjustment data includes the gap adjustment data of the pressure roller 1, the speed adjustment data of the metering shaft 2, and the speed adjustment data of the feeding shaft 3;

[0042] Step S106: Adjust the gap of pressure roller 1, the rotation speed of metering shaft 2 and the rotation speed of feeding shaft 3 based on the adjustment data.

[0043] Specifically, obtain the volume data of the film produced per unit time;

[0044] Obtain data on the volume of powder consumed per unit time;

[0045] Obtain production efficiency data per unit time;

[0046] Obtain feeding data for the surface of the quantitative shaft 2;

[0047] Based on the data of powder consumption volume per unit time, production efficiency per unit time, and feeding data on the surface of the quantitative shaft 2, the rotation speed adjustment data of the quantitative shaft 2 is obtained.

[0048] Furthermore, the film volume data V = H × (W + 2a) × L × 1000;

[0049] Where H is the thickness of the film, W is the width of the film, L is the production efficiency per unit time, and a is the single-sided cutting amount of the film.

[0050] Based on the production film volume data V per unit time and the powder consumption volume data V1 per unit time, the conversion coefficient K1 = V1 / V of the powder material required to produce a unit volume of film is obtained.

[0051] Generally speaking, K1 is also related to the active material of the battery. In this embodiment, its range is approximately 3-6.

[0052] In practical use, the volume of powder consumed per unit time, V1, can be obtained by measurement.

[0053] The feeding data on the surface of the quantitative shaft 2 includes the cross-sectional area S1 of the quantitative pit 201 of the quantitative shaft 2 and the set data B1;

[0054] The rotational speed adjustment data of the quantitative shaft 2 is ΔM1 = 1000K1ΔHL / B1S1.

[0055] Furthermore, the rotational speed ratio data between the quantitative shaft 2 and the feeding shaft 3 is obtained, and the rotational speed adjustment data of the feeding shaft 3 is obtained based on the rotational speed adjustment data of the quantitative shaft 2 and the rotational speed ratio data.

[0056] The rotational speed adjustment data of the feed shaft 3 is ΔM2=ΔM1 / K2=1000K1ΔHL / B1S1K2;

[0057] Wherein, K2 is the rotational speed ratio between the metering shaft 2 and the feeding shaft 3.

[0058] In fact, the direct variable affecting the film thickness is the powder inventory directly on the pressure roller, while the rotational speeds of the metering shaft and the feeding shaft are indirect variables. Their rotational speeds primarily affect the powder inventory directly on the pressure roller. Therefore, the following adjustment method is used to make the entire adjustment system more complete and accurate.

[0059] Specifically:

[0060] Obtain the powder inventory between the pressure rollers 1 and the film pressure rollers;

[0061] Obtain the limit value of powder inventory; wherein, the limit value includes the maximum limit value, the minimum limit value, and the standard value;

[0062] When the powder content is greater than or equal to the standard value, the pressure roller 1 is activated;

[0063] When the powder inventory is greater than or equal to the maximum limit, the powder output amount is reduced.

[0064] When the powder inventory is less than or equal to the minimum limit value, the powder output amount is increased.

[0065] Based on this embodiment Figure 2 and Figure 3The structure shown also provides a dry electrode manufacturing apparatus to implement the above method. The apparatus includes at least two sets of pressure rollers 1 with a gap between them. Each pressure roller 1 is connected to a first driving device, which adjusts the gap between the pressure rollers 1. A feeding mechanism 4 is provided above each pressure roller 1. The feeding mechanism 4 contains a feeding shaft 3 and a metering shaft 2. The rotational speeds of the feeding shaft 3 and the metering shaft 2 are adjustable. The feeding shaft 3 is positioned above the metering shaft 2. The feeding shaft 3 includes a circular shaft 301. The surface of the circular shaft 301 is provided with several sets of uniformly arranged blades 302. A feeding cavity is formed between adjacent blades 302. A metering recess 201 is provided on the surface of the metering shaft 2. Both the feeding shaft 3 and the metering shaft 2 are connected to a second driving device, which adjusts the rotational speeds of the feeding shaft 3 and the metering shaft 2.

[0066] It should be noted that, by combining the above method, the rotational speed of the metering shaft 2 can be calculated by obtaining the cross-sectional area S1 of the metering recess 201 of the metering shaft 2 and the set data B1.

[0067] Rotational speed of fixed shaft 2 M1 = V1 / [(W+2a)×B1×S1] = 1000K1HL / B1S1;

[0068] Generally, the device will be equipped with a corresponding edge cutting device 6 to realize the corresponding edge cutting process. The single-sided cutting amount is a (mm), and a is generally preferred to be 5mm.

[0069] The rotational speed ratio K between the metering shaft 2 and the feeding shaft 3 is used to determine the speed. 2， The rotational speed of feed shaft 3 can be calculated:

[0070] The rotational speed of feed shaft 3 is M2 = 1000K1HL / B1S1K2.

[0071] The feeding shaft is a central circular shaft surrounded by blades. Its functions are twofold: first, to prevent powder from caking in the funnel, thus ensuring a smooth feed and preventing air pockets at the bottom of the funnel; second, to feed the metering shaft, ensuring the feeding grooves are filled accurately each time. A cavity, defined as S2, is formed between the two blades of the feeding shaft. Each time the shaft rotates upwards, the powder in the funnel falls between the blades under gravity and the force of the blades. When rotating to a position close to the metering shaft, the blades push the powder into the grooves of the metering shaft. To ensure sufficient feeding, S2 is often required to be greater than S1. This also allows for speed reduction, preventing dust from being stirred up by the feeding shaft. Assuming the feeding shaft's rotational speed is M2 and the reduction ratio is K2, we can calculate M2 = M1 / K2 (r / min). However, here we only need to ensure sufficient feeding, adjusting the M2 value according to the safety factor.

[0072] In practical use, a corresponding film thickness detector is usually added to monitor the film thickness. In this embodiment, the pressure roller 1 system is set up for two-stage use. The first stage includes two sets of pressure rollers 1 arranged opposite each other. The first-stage pressure roller system is located below the feeding mechanism 4. The second-stage pressure roller system can be the pressure roller system for discharging products. Here, the first drive mechanism in this solution is divided into a first-stage drive device and a second-stage drive device, which respectively control the spacing between the pressure rollers in the corresponding pressure roller system.

[0073] Specifically, both the input and output ends of the secondary pressure roller are equipped with laser detectors, namely a first laser detector and a second laser detector. The first laser detector is used to detect the thickness of the film output from the primary pressure roller, and the second laser detector is used to detect the thickness of the film output from the secondary pressure roller. The first laser detector is connected to the first control module, which is used to control the primary drive equipment. The output end of the second laser detector is connected to the second control module, which is used to control the secondary drive equipment. When the first laser detector detects a difference between the actual film thickness H1 and the set thickness H, the product thickness adjustment data can be obtained through calculation.

[0074] Product thickness adjustment data ΔH = H1 - H;

[0075] The adjustment data for the quantitative shaft speed can be calculated using the product thickness adjustment data.

[0076] The quantitative shaft speed adjustment amount ΔM1 = 1000K1ΔHL / B1S1;

[0077] Therefore, the feed shaft speed adjustment data is ΔM2=1000K1ΔHL / B1S1K2;

[0078] When the second laser detector detects a difference between the thickness H2 of the discharged film and the set thickness H, the calculated gap adjustment value between the secondary pressure rollers is: ΔN = H2 - H;

[0079] In specific implementations, such as Figure 4 As shown, to ensure the continuous operation of the equipment, there is a need to maintain a certain amount of powder between the primary pressure rollers. This can be achieved by installing two sets of sensors above the primary pressure rollers, namely a first sensor and a second sensor, to sense the amount of powder between the primary pressure rollers. The sensors can be contact sensors. The first sensor is positioned at the maximum powder level, and the second sensor is positioned at the minimum powder level. The outputs of both sets of sensors are connected to a third control module, which is equipped with a minimum standard adjustment amount ΔM. 标 The output of the third control module is connected to the second drive device;

[0080] When the powder level between the primary pressure rollers is between the first sensor and the second sensor, the primary pressure rollers start operating normally.

[0081] When the powder level between the primary pressure rollers reaches the position of the first sensor, the first sensor transmits a signal to the third control module. Upon receiving the signal, the third control module controls the second drive device to rotate at 0.5 times the rotational speed. This reduces the powder level between the primary pressure rollers by decreasing the rotational speed of the metering shaft and the feeding shaft. When the powder level falls below the position of the first sensor, the first sensor transmits a signal to the third control module. At this point, the third control module controls the second drive device to decrease by a minimum standard adjustment amount ΔM. 标 To rotate.

[0082] When the powder level between the primary pressure rollers falls below the level of the second sensor, the second sensor transmits a signal to the third control module. Upon receiving the signal, the third control module controls the second drive device to rotate at twice the normal speed. This reduces the powder level between the primary pressure rollers by decreasing the speed of the metering shaft and the feeding shaft. When the powder level reaches the standard value, sensor 7 transmits a signal to the control module 8. At this point, the control module controls the second drive device 6 to increase the adjustment by a minimum standard adjustment amount ΔM. 标 To rotate;

[0083] This process is repeated to ensure continuous operation. Data combinations that do not require adjustment for one hour can be stored for use in the next startup data combination. This reduces deviations caused by unstable startup conditions and ensures that manual or intermittent material feeding in the hopper does not affect the rolling environment between the primary pressure rollers.

[0084] It should be noted that fluctuations in the powder content between the primary pressure rollers directly affect the fluctuations in the thickness of the extruded film, causing quality issues with the film and impacting subsequent processes. Therefore, a standard powder content value can be set, and the two limit values ​​will be similar. This control structure aims to ensure a stable roller pressing environment and promptly adjust to minimize the impact when changes are detected.

[0085] In this embodiment, the first sensor and the second sensor are the sensor 5 in the attached drawing; the first laser detector and the second laser detector are the thickness detection device 7 in the attached drawing.

[0086] The embodiments described above are merely examples of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention.

Claims

1. A dry electrode manufacturing method, characterized in that, The method includes the following steps: Obtain the thickness data of the film; Adjustment data is obtained based on the thickness data of the film. The adjustment data includes the gap adjustment data of the pressure roller, the speed adjustment data of the metering shaft, and the speed adjustment data of the feeding shaft; Adjust the gap of the pressure roller, the speed of the metering shaft, and the speed of the feeding shaft based on the adjustment data; The step of obtaining the rotational speed adjustment data of the quantitative shaft specifically includes: Obtain the volume data of the film produced per unit time; Obtain data on the volume of powder consumed per unit time; Obtain production efficiency data per unit time; Obtain feeding data from the surface of the quantitative shaft; Based on the data of powder consumption volume per unit time, production efficiency per unit time, and feeding data of the quantitative shaft surface, the speed adjustment data of the quantitative shaft is obtained. The steps for obtaining the rotational speed adjustment data of the feed shaft specifically include: Obtain the rotational speed ratio data between the metering shaft and the feeding shaft, and based on the rotational speed adjustment data of the metering shaft and the rotational speed ratio data, obtain the rotational speed adjustment data of the feeding shaft.

2. The dry electrode manufacturing method according to claim 1, characterized in that: The film volume data is V = H × (W + 2a) × L × 1000; Where H is the thickness of the film, W is the width of the film, L is the production efficiency per unit time, and a is the single-sided cutting amount of the film. Based on the production film volume data V per unit time and the powder consumption volume data V1 per unit time, the conversion coefficient K1 = V1 / V of the powder material required to produce a unit volume of film is obtained. The feeding data of the quantitative shaft surface includes the cross-sectional area S1 of the quantitative pit on the quantitative shaft surface and the set data B1; The speed adjustment data of the quantitative shaft M1=1000K1 HL / B1S1.

3. The dry electrode manufacturing method according to claim 2, characterized in that: The speed adjustment data of the feed shaft M2= M1 / K2=1000K1 HL / B1S1K2; Wherein, K2 is the rotational speed ratio between the metering shaft and the feeding shaft.

4. A dry electrode manufacturing method according to any one of claims 1-3, characterized in that: Obtain the powder inventory between the pressure rollers of the film; Obtain the limit value of powder inventory; wherein, the limit value includes the maximum limit value, the minimum limit value, and the standard value; The pressure roller is activated when the powder content is greater than or equal to the standard value. When the powder inventory is greater than or equal to the maximum limit, reduce the powder output. When the powder inventory is less than or equal to the minimum limit value, increase the powder output.

5. A dry electrode manufacturing apparatus, characterized in that, The dry electrode manufacturing method as described in claim 1 includes an apparatus comprising at least two sets of pressure rollers with a gap between them. Each pressure roller is connected to a first driving device, which adjusts the gap between the pressure rollers. A feeding mechanism is located above each pressure roller, and a feeding shaft and a metering shaft are arranged within the feeding mechanism. The rotational speeds of the feeding shaft and the metering shaft are adjustable. The feeding shaft is positioned above the metering shaft and comprises a circular shaft. A plurality of uniformly arranged blades are arranged on the surface of the circular shaft, forming a feeding cavity between adjacent blades. A metering recess is formed on the surface of the metering shaft. Both the feeding shaft and the metering shaft are connected to a second driving device, which adjusts the rotational speeds of the feeding shaft and the metering shaft.

6. The dry electrode manufacturing apparatus according to claim 5, characterized in that: A sensor is located in the middle of the pressure roller, and the output end of the sensor is connected to a control module. The control module controls the first drive mechanism and the second drive mechanism respectively.

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