阅读说明：本技术 二次电池电极极板干燥方法及干燥系统 (Secondary battery electrode plate drying method and drying system ) 是由 李相华 金成佑 郑会善 金周贤 于 2021-07-01 设计创作，主要内容包括：本发明涉及一种电极极板干燥方法和能够更有效地实现该方法的极板干燥系统,该电极极板干燥方法包括：供气风量设定步骤,将流入干燥器的初始供气风量设定为目标风量以下；排气风量设定步骤,将初始排气风量设定为与在所述供气风量设定步骤中设定的初始供气风量相对应的值；以及风量调节步骤,将供气风量和排气风量在一定时间内从在所述供气风量设定步骤和所述排气风量设定步骤中设定的初始风量增加到指定目标风量,该电极极板干燥方法能够解决由于极板过度干燥和压力变化而引起的干燥均匀性降低的问题。(The invention relates to an electrode plate drying method and a plate drying system capable of more effectively realizing the method, wherein the electrode plate drying method comprises the following steps: a supply air volume setting step of setting an initial supply air volume flowing into the dryer to be less than or equal to a target air volume; an exhaust air volume setting step of setting an initial exhaust air volume to a value corresponding to the initial supply air volume set in the supply air volume setting step; and an air volume adjusting step of increasing the supply air volume and the exhaust air volume from the initial air volumes set in the supply air volume setting step and the exhaust air volume setting step to a specified target air volume within a certain time, the electrode plate drying method being capable of solving the problem of reduced drying uniformity due to excessive drying of the electrode plate and pressure variation.)

1. An electrode pad drying method comprising:

a supply air volume setting step of setting an initial supply air volume flowing into the dryer to be less than or equal to a target air volume;

an exhaust air volume setting step of setting an initial exhaust air volume to a value corresponding to the initial supply air volume set in the supply air volume setting step; and

and an air volume adjusting step of increasing the supply air volume and the exhaust air volume from the initial air volumes set in the supply air volume setting step and the exhaust air volume setting step to a specified target air volume within a certain time.

2. The electrode pad drying method as set forth in claim 1,

the initial supply air volume in the supply air volume setting step and the initial exhaust air volume in the exhaust air volume setting step are set identically.

3. The electrode pad drying method as set forth in claim 2,

the increase of the supply air volume and the exhaust air volume in the air volume adjusting step are performed in stages with a time difference.

4. The electrode pad drying method as set forth in claim 1, further comprising:

an air volume adjustment information calculation step of generating a plurality of air volume increase stages based on the initial supply air volume information input in the supply air volume setting step, the initial exhaust air volume information input in the exhaust air volume setting step, and the set preparation time and arrival time information, and determining a retention time of each air volume increase stage.

5. The electrode pad drying method as set forth in claim 4, further comprising:

a temperature control information acquisition step of calculating a heating fluid flow rate suitable for each air volume increasing stage determined in the air volume adjustment information calculation step.

6. The electrode pad drying method as set forth in claim 5, further comprising:

a temperature adjusting step of adjusting the heating fluid flow rate to a value corresponding to a variation in the air volume increasing step by using the heating fluid flow rate information of each stage acquired in the temperature control information acquiring step.

7. A plate drying system comprising:

a fluid supply into which fluid flows;

a heater heating the fluid supplied through the fluid supplier;

a dryer receiving the fluid heated by the heater and drying the electrode plate;

an ejector that ejects fluid used in the dryer; and

and a controller that adjusts the amount of fluid flowing in through the fluid supply, the amount of fluid discharged through the ejector, and the amount of heat of the heater from specified initial values to target values in stages.

Technical Field

The present invention relates to a method and system for drying an electrode plate of a secondary battery, and more particularly, to a method and system for drying an electrode plate capable of preventing an over-drying phenomenon of the electrode plate and maintaining drying uniformity by flow regulation.

Background

The drying of the electrode pad of the secondary battery is mainly used by combining thermal drying that dries the solvent at a predetermined temperature and air amount without time change and concentration drying that changes the temperature and air amount according to the change of the solvent saturation amount in the drying oven, but in a drying initial state where the solvent saturation amount of the drying oven is zero, the concentration drying amount is large, excessive drying occurs in a short time, and even if restarted after a temporary pause, the concentration drying amount is large, thus causing a defect due to excessive drying for a while.

In most of the drying furnaces of the related art, since the drying conditions are set to predetermined drying temperatures and air volumes for respective dryers and the electrode pads are dried in a state where the temperatures and the air volumes are kept constant, excessive drying is caused by concentration drying in the initial stage of drying, which causes breakage (Crack) of the pads, breakage of the pads, increase in electrode resistance due to Binder Migration (Binder Migration), and the like, and thus there is a problem that the quality of the dried pads is degraded.

In order to prevent such an excessive drying phenomenon, when the air volume flowing into the dryer is adjusted, since the internal pressure of the dryer is changed according to the flowing air volume, there is a problem that not only drying uniformity is lowered, but also a fluctuation phenomenon in which the temperature is unstably changed due to the change of the flow rate of hot oil adjusting the temperature of the air volume flowing into the dryer occurs. Therefore, it is required to develop a new electrode plate drying method capable of solving such problems and a plate drying system optimally performing the plate drying method.

Documents of the prior art

Patent document

Korean laid-open patent publication No. 10-2018-0069388 (name: electrode drying device, Kokai: 2018.06.25)

Disclosure of Invention

Technical problem to be solved

The present invention has been made to solve the above problems, and an object of the present invention is to provide an electrode plate drying method and an electrode plate drying system optimized for the same, which can solve the problem of the quality degradation of an electrode plate due to the breakage or breakage of the electrode plate caused by excessive drying at the initial stage of drying.

In addition, an electrode plate drying method optimized thereto, and an electrode plate drying system optimized thereto are provided that can solve the problems of a change in the internal pressure of a dryer and a reduction in the uniformity of drying when the amount of air flowing into the dryer is adjusted to prevent excessive drying.

In addition, an electrode plate drying method and an electrode plate drying system optimized for the same capable of preventing a temperature fluctuation (hunting) phenomenon occurring when a flow rate of hot oil that adjusts a temperature of an air volume is changed are provided.

(II) technical scheme

The electrode pad drying method of the present invention for achieving the above object includes: a supply air volume setting step (S100) for setting an initial supply air volume flowing into the dryer to be equal to or less than a target air volume; an exhaust air volume setting step (S200) of setting an initial exhaust air volume to a value corresponding to the initial supply air volume set in the supply air volume setting step (S100); and an air volume adjusting step (S300) of increasing an initial supply air volume and an initial exhaust air volume from the initial air volumes set in the supply air volume setting step (S100) and the exhaust air volume setting step (S200) to a specified target air volume within a certain time.

In addition, the initial supply air volume in the supply air volume setting step (S100) and the initial exhaust air volume in the exhaust air volume setting step (S200) are set in the same manner.

In addition, the increase of the supply air volume and the exhaust air volume in the air volume adjusting step (S300) is performed in stages with a time difference.

In addition, the electrode pad drying method further includes: and an air volume adjustment information calculation step (S400) of generating a plurality of air volume increase stages based on the initial supply air volume information input in the supply air volume setting step (S100), the initial exhaust air volume information input in the exhaust air volume setting step (S200), and the set preparation time and arrival time information, and determining a retention time of each air volume increase stage.

In addition, the electrode pad drying method further includes: a temperature control information acquisition step (S500) of calculating a heating fluid flow rate suitable for each air volume increasing stage determined in the air volume adjustment information calculation step (S400).

In addition, the electrode pad drying method further includes: a temperature adjusting step (S600) of adjusting the heating fluid flow rate to a value corresponding to a change in the air volume increasing stage by using the heating fluid flow rate information of each step acquired in the temperature control information acquiring step (S500).

The plate drying system of the present invention for achieving the above object includes: a fluid supply 100 into which fluid flows; a heater 200 heating the fluid supplied through the fluid supplier 100; a dryer 300 receiving the fluid heated by the heater 200 and drying the electrode plate; an ejector 400 that ejects the fluid used in the dryer 300; and a controller 500 for adjusting the amount of fluid flowing in through the fluid supplier 100, the amount of fluid discharged through the ejector 400, and the amount of heat of the heater 200 in stages from predetermined initial values to target values.

In addition, in the controller 500, the initial intake air volume and the initial exhaust air volume are set in the same manner.

In the controller 500, when the air volume is adjusted, the increase in the supply air volume and the increase in the exhaust air volume are performed in stages with a time difference.

In addition, the controller 500 may further include: and an air volume adjusting information calculator that generates a plurality of air volume increasing stages based on the initial supply air volume information input when the supply air volume is set, the initial exhaust air volume information input when the exhaust air volume is set, and the set preparation time and arrival time information, and determines a holding time of each air volume increasing stage.

In addition, the controller 500 further includes: and a temperature control information acquirer that calculates a heating fluid flow rate suitable for each air volume increasing stage determined in the air volume adjusting information calculator.

In addition, the controller 500 adjusts the heating fluid flow rate to a value corresponding to the variation of the air volume increasing stage by using the heating fluid flow rate information of each step acquired from the temperature control information acquirer.

(III) advantageous effects

The electrode plate drying method and the electrode plate drying system increase the air volume flowing into the dryer in stages within a certain time, so the electrode plate drying method and the electrode plate drying system have the advantage of solving the problem of excessive drying when the dryer is restarted after temporary pause.

In addition, the supply air volume and the exhaust air volume are kept the same, so that the problem that the drying uniformity is reduced due to the pressure change in the dryer can be solved.

Further, since the flow rate of the hot oil for adjusting the fluid temperature is adjusted in stages to increase the air volume in stages at regular intervals, there is an advantage that the temperature fluctuation phenomenon occurring when the air volume is increased in stages can be prevented.

Drawings

Fig. 1 is a flowchart illustrating an electrode pad drying method according to a first embodiment of the present invention.

Fig. 2 is a table for explaining air volume adjustment by the electrode pad drying method according to the first embodiment.

Fig. 3 is a flowchart illustrating a plate drying method according to a second embodiment of the present invention.

Fig. 4 is a table for explaining plate drying using the plate drying method according to the second embodiment of the present invention.

Fig. 5 is a graph of the temperature measured at various locations of the dryer before and after the plate drying method of the present invention described above.

Fig. 6 is a graph of the amount of gas generated measured before and after the plate drying method of the present invention is used in the drying process.

Fig. 7 is a schematic diagram illustrating the plate drying system of the present invention.

Description of the reference numerals

100: fluid supply 200: heating device

300: the dryer 400: ejector

500: the controller S100: air supply volume setting step

S200: exhaust air volume setting step S300: air quantity adjusting step

S400: air volume adjustment information calculation step S500: temperature control information acquisition step

S600: temperature adjusting step

Detailed Description

The advantages, features and methods of implementing embodiments of the present invention will become more apparent with reference to the embodiments and accompanying drawings described in detail below. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in various forms, which are provided only for the purpose of completeness of disclosure of the present invention and to inform those of ordinary skill in the art of the scope of the present invention, which is defined by the scope of the claims. Like reference numerals refer to like elements throughout the specification.

In describing the embodiments of the present invention, a detailed description of known functions or configurations will be omitted in a case where it is judged that the detailed description may unnecessarily obscure the gist of the present invention. In addition, terms to be described later are terms defined in consideration of functions in the embodiments of the present invention, and may vary according to intention or custom of a user or an operator, or the like. Therefore, the definition should be made based on the contents throughout the specification.

Hereinafter, the electrode plate drying method (S1000) according to the present invention will be described with reference to the drawings.

Fig. 1 is a flowchart illustrating an electrode pad drying method (S1000) according to a first embodiment of the present invention, and fig. 2 is a table for explaining air volume adjustment by the electrode pad drying method (S1000). Referring to fig. 1, an electrode pad drying method (S1000) according to a first embodiment of the present invention may include: a supply air volume setting step (S100) for setting an initial supply air volume flowing into the dryer to be equal to or less than a target air volume; an exhaust air volume setting step (S200) of setting an initial exhaust air volume to a value corresponding to the initial supply air volume set in the supply air volume setting step (S100); and an air volume adjusting step (S300) of increasing the supply air volume and the exhaust air volume from the initial air volume set in the supply air volume setting step (S100) and the exhaust air volume setting step (S200) to a specified target air volume within a certain time.

Specifically, a thermal drying method using temperature and air volume and a concentration drying method using a saturated amount of solvent are used together for drying the secondary battery electrode plate. In this case, when the system is restarted after the system is shut down, since the solvent saturation amount in the dryer does not reach a predetermined value, there is a problem that the electrode plate is excessively dried and a defect occurs, and therefore, the present invention solves the problem of excessive drying that occurs when excessive air volume flows into the dryer in a state where the solvent saturation amount of the dryer does not reach a predetermined value by increasing the air volume in stages after setting the supply air volume to be equal to or less than the target air volume.

However, when only the air volume flowing into the dryer is adjusted, the internal pressure of the dryer is changed according to the inflowing air volume, resulting in a reduction in the drying uniformity of the electrode plates, and thus in the air volume adjusting step (S300), the air volume flowing into the dryer and the air volume discharged from the drying oven are equally adjusted.

Referring again to fig. 2, as shown in fig. 2 (a), when the initial supply air volume and the initial exhaust air volume are set to be equal to or less than the target supply air volume and the target exhaust air volume based on the target supply air volume and the target exhaust air volume as 100%, the supply air volume setting step (S100) and the exhaust air volume setting step (S200) operate at the set initial supply air volume and initial exhaust air volume for the preparation time, and then the air volume increase width at each stage is determined according to the reaching time, and then the supply air volume and the exhaust air volume are increased in stages corresponding to the designated air volume increase stage as shown in fig. 2 (b).

Fig. 3 is a flowchart illustrating a plate drying method (S1000) according to a second embodiment of the present invention, and fig. 4 is a table for explaining plate drying using the plate drying method (S1000) according to the second embodiment of the present invention. Referring to fig. 3, the plate drying method (S1000) according to the second embodiment may further include: an air volume adjusting information calculating step (S400) of generating a plurality of air volume increasing stages based on the initial supply air volume information input in the supply air volume setting step (S100), the initial exhaust air volume information input in the exhaust air volume setting step (S200), and input or preset preparation time and arrival time information, and determining a holding time of each air volume increasing stage; a temperature control information acquisition step (S500) of calculating a heating fluid flow rate suitable for each air volume increase stage determined in the air volume adjustment information calculation step (S400); and a temperature adjusting step (S600) of adjusting the heating fluid flow rate to a value corresponding to the variation of the air volume increasing step by using the heating fluid flow rate information of each stage acquired in the temperature control information acquiring step (S500), and the temperature adjustment and the air volume adjustment of the heating fluid can be simultaneously performed.

Specifically, the above air flow rate refers to the amount of fluid supplied to the dryer per unit time, and in order to improve the plate quality, the fluid must be maintained at an optimum temperature for drying the plates provided on the dryer. When the amount of fluid supplied to the dryer is continuously changed, however, it is necessary to adjust the fluid temperature to a proper temperature after measuring the changed fluid temperature again, and during this operation, even if a control system capable of minimizing the fluctuation width, such as a PID controller, is applied, a fluctuation (hunting) phenomenon in which the temperature is unstably varied occurs, and therefore not only the temperature fluctuation width is large, further, since there is a problem that the gas generation concentration becomes equal to or higher than an appropriate value due to a large fluctuation range of the temperature, in the present invention, the flow rate of the heating fluid required to maintain the proper temperature at each stage determined in the air quantity regulation information calculation step (S400) is calculated by the temperature control information acquisition step (S500), then, in the temperature adjusting step (S600), the flow rate of the heating fluid is adjusted to an appropriate value corresponding to the increase in the air volume.

To explain again with reference to fig. 3 and 4, when the initial supply air volume and the initial exhaust air volume are set by the supply air volume setting step (S100) and the exhaust air volume setting step (S200), as shown in (a) of fig. 4, the stage of adjusting the supply air volume and the exhaust air volume is divided into a plurality of stages based on the air volume information input in the air volume adjusting information calculating step (S400) and the preparation time and arrival time information being input or having been input, and the flow rates of the heating fluid suitable for the respective stages of the division are calculated in the temperature control information acquiring step (S500), and then the air volume adjustment and the heating fluid flow rate adjustment for temperature maintenance can be simultaneously performed by the air volume adjusting step (S300) and the temperature adjusting step (S600), as shown in (b) of fig. 4.

Fig. 5 shows graphs in which the temperature of each position of the dryer is measured before and after the plate drying method of the present invention described above is used, and fig. 6 shows graphs in which the amount of gas generated is measured before and after the plate drying method of the present invention is used in the drying process, and in fig. 6, the method is represented as fas.

Comparing fig. 5 (a) showing the temperature distribution of each region when the method of adjusting the flow rate of the heating fluid in stages is not employed and fig. 5 (b) showing the temperature distribution after calculating the flow rate of the heating fluid suitable for each of the supply air volume and exhaust air volume adjusting stages (stage 1, stage 2, stage 3, stage 4) divided into a plurality of stages through the temperature control information acquiring step (S500) of the present invention and then adjusting the flow rate of the heating fluid while adjusting the supply air volume and the exhaust air volume through the air volume adjusting step (S300) and the temperature adjusting step (S600), it can be seen that the temperature fluctuation level and distribution of each region are greatly alleviated even when the air volume in the dryer fluctuates by applying the hot oil flow rate control method of the present invention.

This is because the hot oil amount is set to match the temperature of the wind from the dryers with the corresponding wind amount, and when the wind amount of the dryers rapidly fluctuates, the hot oil amount will not follow the reactivity thereof, and thus the temperature fluctuation occurs, but as described in the present invention, the temperature deviation of each dryer is reduced and the temperature fluctuation amount is minimized by precisely matching the hot oil amount suitable for the wind amount of each dryer.

Fig. 7 is a schematic view showing a plate drying system used in the plate drying method described above. Referring to fig. 7, the plate drying system 1000 of the present invention may include: a fluid supply 100 into which fluid flows; a heater 200 heating the fluid supplied through the fluid supplier 100; a dryer 300 receiving the fluid heated by the heater 200 and drying the electrode plate; an ejector 400 that ejects the fluid used in the dryer 300; and a controller 500 for adjusting the amount of fluid flowing in through the fluid supplier 100, the amount of fluid discharged through the ejector 400, and the amount of heat of the heater 200 in stages from predetermined initial values to target values.

Specifically, the controller 500 receives initial supply air volume information and initial exhaust air volume information through the supply air volume setting step (S100) and the exhaust air volume setting step (S200), and calculates a plurality of air volume increasing stages and air volume information suitable for the respective stages through the air volume adjusting information calculating step (S400), and calculates heating fluid flow volume information suitable for the respective air volume increasing stages through the temperature control information obtaining step (S500), and then operates the fluid supplier 100, the heater 200, and the ejector 400 at specified values at specified time points, and more correct electrode pad drying can be performed in the respective air volume increasing stages.

The present invention is not limited to the above-described embodiments, and the application range thereof is various, and various modifications can be made by those skilled in the art to which the present invention pertains without departing from the gist of the present invention claimed in the claims.