KR102207830B1 - A bulky and precise machine and a method for transferring a slurry for secondary battery - Google Patents

Abstract

The present invention secures productivity by using a large-capacity pump equipped with a large-capacity and small-capacity automatic valve in order to solve the problems of the prior art in transporting electrode slurry for a secondary battery, and enables precise transport to ensure uniformity in the quality of the electrode. Is also to secure.

Description

A bulky and precise machine and a method for transferring a slurry for secondary battery}

The present invention relates to a technology for precisely transferring slurries such as a positive electrode material and a negative electrode material for manufacturing an electrode of a secondary battery with a large capacity.

A secondary battery converts chemical energy into electrical energy to supply power to an external circuit, and when discharged, it receives external power and converts electrical energy into chemical energy to store electricity, and is generally called a storage battery. .

For example, a lithium-ion battery. One of the two electrodes uses lithium-cobalt oxide and the other uses graphite. Both poles have a layered structure, and charging and discharging continues as lithium ions enter and exit the layers. The problem is that this movement of lithium degrades the structure of the electrode. Lithium-cobalt oxide is relatively stable to this motion of lithium, whereas graphite degrades its layered structure when this motion is repeated several times. The result is a shortened battery life. Most of the cell phones use lithium-ion batteries, which is why the usage time is shortened later.

Most of the medium and large-capacity lithium secondary batteries put energy density and safety first, and are focusing on the development of next-generation batteries and new innovative batteries, mainly through high performance through new technologies of existing lithium secondary battery systems.

Development for improved energy density, output and input density performance and lower price while securing safety for various commercially available anode materials and cathode material systems for the purpose of improving the long life and calendar life required as a lithium secondary battery for vehicles. have.

The development of the material itself is important for the active material of the electrode, which has an important effect on the life and output of the secondary battery, but it is important to precisely transfer the active material slurry so that it is uniformly coated on the current collector in an accurate amount in the electrode production process.

It is preferable to use a metering pump for such precise transfer, but in the case of a metering pump, there is a problem of lowering productivity because large-capacity transfer is impossible. In addition, devices for the purpose of more precise transfer are used depending on the industrial field, such as U.S. Patent No. 6,273,345 and U.S. Patent Publication No. 2013-0280992, but these technologies focus on precision, so productivity is improved. Naturally, it is not only a problem, but also unsuitable for transporting active material slurry for secondary batteries.

Conversely, in the case of using a large-capacity pump in consideration of the productivity aspect, productivity can be improved, but accurate precise transfer is difficult, resulting in uneven or defective electrode quality.

US Patent Registration No. 6,273,345 US Patent Publication No. 2013-0280992

In order to solve the problems of the prior art, the present invention has been devised to secure productivity by using a large-capacity pump and to enable precise transfer, thereby also securing quality uniformity of an electrode, which is a product.

According to an embodiment of the present invention for solving the problem of the prior art,

The present invention relates to a high-capacity precision transfer device for a secondary battery slurry, comprising: a compressor; Large capacity pump; An automatic valve composed of a large-capacity and small-capacity automatic valve that supplies compressed air from the compressor to a large-capacity pump; And a controller.

In the above, it is preferable to use a large-capacity diaphragm pump as the large-capacity pump. When using a diaphragm pump, it is preferable that the feed rate is 40 to 43 kg/min.

In the above, it is more preferable that the large and small capacity automatic valves are controlled by a PLC (Programmable Logic Controller) controller.

In the pipeline of compressed air supplied from the compressor to the large-capacity pump, a check valve is included to prevent control vibration or reverse flow of compressed air with PLC control.

As a specific example of the present invention, in order to reduce equipment cost and compact the device, it is possible to configure a facility capable of quantitative metering with one pump and one compressor.

As another specific example according to the present invention, the present invention provides a large-capacity precision transfer method of a slurry for a secondary battery. That is, as a method of supplying compressed air from a compressor to a large-capacity pump to transport slurry for a secondary battery, the method comprising: adjusting a large-capacity automatic valve and transferring the slurry to a large capacity; And it includes the step of precisely transferring by adjusting the small-capacity automatic valve.

The present invention is an apparatus and method for high-capacity precision transfer of electrode slurry for secondary batteries. By transferring the electrode slurry for secondary batteries with a large capacity, productivity is improved, and at the same time, precise transfer is possible, so that the quality of the electrode as a product can be uniformly maintained.

1 is a schematic diagram schematically representing a specific example of the present invention.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. However, embodiments of the present invention may be modified in various other forms, and the scope of the present invention is not limited to the embodiments described below.

In describing the present embodiments, the same name is used for the same configuration, and thus, redundant additional descriptions are omitted below. In the drawings referred to below, the accumulation ratio is not applied.

According to the present invention, a separate compressor is not required, compressed air is supplied from one compressor, and compressed air is controlled by using two automatic valves of large capacity and small capacity, so that the amount of large-capacity supply and small-capacity supply is controlled by an automatic valve. It is possible to freely control through this, so it is easy to secure quantitativeity and discharge volume, and precise weighing and transfer is possible by adjusting the last small volume section through PLC control.

Specifically, the present invention relates to a high-capacity precision transfer device for a secondary battery slurry, comprising: a compressor; Large capacity pump; An automatic valve composed of a large-capacity and small-capacity automatic valve that supplies compressed air from the compressor to a large-capacity pump; And a controller (Fig. 1).

In the above, it is preferable to use a large-capacity diaphragm pump as the large-capacity pump, but the present invention is not limited thereto, and various large-capacity pumps within a range obvious to those skilled in the art are possible. For example, a rotary pump operated by air is also possible.

In the above, it is more preferable that the large and small capacity automatic valves are controlled by a PLC (Programmable Logic Controller) controller. In addition, a check valve is included in the pipeline of compressed air supplied from the compressor to the large-capacity pump to prevent control vibration or reverse flow of compressed air together with PLC control.

In addition, in order to reduce equipment cost and compact the device, it is possible to configure a facility capable of quantitative metering with one pump and one compressor.

On the other hand, the present invention provides a large-capacity, precise transfer method of the slurry for a secondary battery. That is, as a method of supplying compressed air from a compressor to a large-capacity pump to transport slurry for a secondary battery, the method comprising: adjusting a large-capacity automatic valve and transferring the slurry to a large capacity; And it includes the step of precisely transferring by adjusting the small-capacity automatic valve. In the end, since the amount of large-capacity supply and small-capacity supply can be freely controlled through an automatic valve, it is easy to secure quantitativeity and discharge amount, and precise metering and transfer is possible by adjusting the last small capacity section through PLC control.

The present invention was tested in comparison with the case of using only a conventional large-capacity diaphragm pump.

First, when only a large-capacity diaphragm pump is used to transfer electrode slurry, three experiments (T1, T2, T3) were performed, and when a set value was set to transfer 12 kg, the diaphragm pump was 19~21kg/ It was possible to transfer only at a feed rate of min, and the accuracy was inferior in the actual transfer amount. The experimental results are shown in Table 1 below. When the feed rate of the diaphragm pump was increased or decreased, the actual feed amount was significantly different from the setting value.

division Automatic valve
pressure Setting value Actual transfer amount Difference T1 3.5 12.0 12.49 0.490 T2 4.0 12.0 12.88 0.880 T3 4.5 12.0 12.93 0.930

On the other hand, when the apparatus and method according to the present invention were subjected to the same conditions, even if the transfer speed of the diaphragm pump was about twice as high as 40 to 43 kg/min, the slurry could be transferred with higher accuracy. The experimental results are shown in Table 2 below.

division Large capacity
Automatic valve Small capacity
Automatic valve Setting value Actual transfer amount Difference T1 3.5 3.0 12.0 11.841 -0.159 T2 4.0 3.0 12.0 12.152 0.152 T3 4.5 3.0 12.0 12.176 0.176

Although the embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and variations are possible without departing from the technical spirit of the present invention described in the claims. It will be obvious to those of ordinary skill in the field.

Claims (13)

delete delete delete delete delete delete As a method of supplying compressed air from a compressor to a large-capacity pump to transfer the slurry for a secondary battery,
Setting a slurry transfer amount;
Opening a large-capacity automatic valve, closing a small-capacity automatic valve, and transferring the slurry; And
Closing the large-capacity automatic valve and opening the small-capacity automatic valve to transfer the slurry; Including,
The large-capacity pump is a large-capacity diaphragm pump, and the transfer speed of the diaphragm pump is 40-43 kg/min,
The error range of the amount of the transferred slurry is -0.159 to 0.176% of the set slurry transfer amount.
The method of claim 7, wherein the automatic valve is controlled by a controller.
The method of claim 8, wherein the controller is a PLC (Programmable Logic Controller).
delete delete The method of claim 7, further comprising a check valve to prevent reverse flow of air pressure.
The method of claim 7, wherein the compressed air is supplied from one compressor.

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