KR20240040919A - Electrode drying device and electrode drying method - Google Patents

Abstract

The electrode drying apparatus according to the present invention includes a drying furnace that provides a space for the electrode sheet to travel and dry; Drying means installed inside the drying furnace and drying the electrode slurry; a temperature measuring unit that contacts the current collector and measures the temperature of the surface of the current collector; And the measurement result of the temperature measuring unit is input, the measurement result is processed by an operation program to determine the drying level of the electrode sheet, and if the determined drying level does not meet the standard, the drying condition of the drying means is changed. It includes a control unit that changes and corrects the drying level.

Description

Electrode drying device and electrode drying method}

The present invention relates to an electrode drying device and an electrode drying method that improve the accuracy of determining the drying level of an electrode sheet.

In general, secondary batteries refer to batteries that can be charged and discharged, unlike primary batteries that cannot be recharged. These secondary batteries are widely used in the field of high-tech electronic devices such as phones, laptop computers, and camcorders.

The above-mentioned secondary battery is classified into a can-type secondary battery and a pouch-type secondary battery, and the can-type secondary battery includes an electrode assembly, an electrolyte, a can containing the electrode assembly and the electrolyte, and a cap assembly mounted on the opening of the can. And the electrode assembly has a structure in which electrodes and separators are alternately stacked. And the electrode includes a current collector and an electrode active material coated on the current collector.

Meanwhile, the method of manufacturing the electrode includes a transfer step of transferring the current collector, a coating step of forming an electrode mixture layer by applying electrode slurry to the surface of the current collector, and applying radiant heat by an infrared heater to the electrode slurry coated on the current collector. It includes a drying step of drying by supplying or spraying hot air.

The drying step of the electrode has a significant impact on the quality and physical properties of the electrode. If the electrode is overdried, cracks may occur in the electrode and electrode powder may be generated, and the electrode powder will scatter far along the convection current within the drying furnace, contaminating the surrounding electrodes and deteriorating the quality of the electrode. . Conversely, if the electrode is not sufficiently dried, the adhesion of the electrode decreases.

Therefore, when drying an electrode, the drying process is managed by monitoring the drying level of the electrode sheet to prevent over-drying or under-drying from occurring. Conventionally, the temperature inside the dryer was measured or an infrared thermometer was used to measure the temperature of the electrode slurry. The temperature was measured to determine the dryness level of the electrode. However, since the infrared thermometer is a non-contact temperature measurement method, judging the dryness level of the electrode based on this temperature measurement method has the disadvantage of being inaccurate.

Therefore, there is a need to develop technology for electrode drying devices and drying methods to improve the accuracy of determining the drying level of electrodes.

Republic of Korea Patent Publication No. 10-2007-0092385

The purpose of the present invention is to provide an electrode drying device and drying method that improves the accuracy of determining the drying level of an electrode sheet.

The electrode drying apparatus according to the present invention includes a drying furnace that provides a space in which an electrode sheet coated with an electrode slurry on a current collector travels and dries; Drying means installed inside the drying furnace and drying the electrode slurry by supplying hot air and/or infrared rays toward the electrode slurry; a temperature measuring unit that contacts the current collector and measures the temperature of the surface of the current collector; And the measurement result of the temperature measuring unit is input, the measurement result is processed by an operation program to determine the drying level of the electrode sheet, and if the determined drying level does not meet the standard, the drying condition of the drying means is changed. It includes a control unit that changes and corrects the drying level.

In one embodiment of the present invention, the temperature measuring unit includes a thermistor that detects the temperature of the surface of the current collector; An elastic member coupled to one side of the thermistor; and a housing having a space therein for accommodating the thermistor and the elastic member.

In one embodiment of the present invention, the end portion of the thermistor that contacts the current collector may have a round shape.

In one embodiment of the present invention, the calculation program may include an equation for calculating the drying level of the electrode according to variables such as the temperature of the current collector surface, the loading amount of the electrode slurry, and the solid content of the electrode slurry.

In one embodiment of the present invention, the drying means includes: an infrared heater configured to irradiate infrared rays toward the electrode slurry; and a hot air supply unit configured to spray hot air toward the electrode slurry.

In one embodiment of the present invention, the control unit may correct the drying level by changing one or more drying conditions among the wind speed of the hot air, the temperature of the hot air, and the output of the infrared heater.

In one embodiment of the present invention, the drying means includes a plurality of infrared heaters, and the plurality of infrared heaters may be arranged at regular intervals along the traveling direction of the electrode sheet.

In one embodiment of the present invention, some of the infrared heaters are combined with a screen unit to block a portion of the radiant heat emitted from the infrared heater, and the screen unit covers one side and the other side in the longitudinal direction of the infrared heater. First and second shielding units configured to shield; And a screen that connects the first and second shields, but includes first and second connecting parts that are spaced apart from each other; and may include a base plate disposed on the bottom of the screen to support the screen.

In one embodiment of the present invention, the drying furnace is divided into a first drying zone in which an infrared heater to which the screen unit is not coupled is disposed, and a second drying zone in which an infrared heater to which the screen unit is coupled is disposed, The temperature measuring unit is disposed in the first drying zone and is not disposed in the second drying zone.

The electrode drying method according to the present invention includes the steps of measuring the temperature of an electrode sheet running inside a drying furnace; A process of determining the dryness level of the electrode sheet from the measured temperature value; And if the determined drying level does not meet the standard, it includes a process of changing the drying conditions, and the process of measuring the temperature includes measuring the temperature of the surface of the current collector by contacting the current collector of the electrode sheet. It is characterized by using a configured temperature measuring member.

In one embodiment of the present invention, the process of determining the drying level includes the temperature of the current collector surface measured in the process of measuring the temperature, the loading amount of the electrode slurry applied to the electrode sheet, and the solid content of the electrode slurry. Depending on the variables, the dryness level of the electrode sheet can be determined using a calculation program that calculates the dryness level of the electrode.

In one embodiment of the present invention, the temperature measuring member includes: a thermistor that senses the temperature of the surface of the current collector; An elastic member coupled to one side of the thermistor; And it may include a housing having a space for accommodating the thermistor and the elastic member.

In one embodiment of the present invention, the end portion of the thermistor that contacts the current collector may have a round shape.

In one embodiment of the present invention, the process of changing the drying conditions includes changing the drying level of the electrode sheet by changing one or more of the wind speed and temperature of the hot air supplied to the electrode sheet and the output of the infrared heater irradiated to the electrode sheet. It can be corrected.

In the electrode drying device and electrode drying method of the present invention, the temperature measuring unit or temperature measuring member directly contacts the surface of the current collector, measures the temperature of the surface of the current collector, and determines the drying level of the electrode based on this. There is an effect of improving the accuracy of judgment.

1 is a side view of an electrode drying apparatus according to an embodiment of the present invention.
Figure 2 is a top view of an electrode drying apparatus according to an embodiment of the present invention.
Figure 3 is a block diagram of an electrode drying apparatus according to an embodiment of the present invention.
Figure 4 is a perspective view of a portion of an electrode drying apparatus according to an embodiment of the present invention.
Figure 5 is a diagram showing a temperature measuring unit according to an embodiment of the present invention.
Figure 6 is a cross-sectional view of a temperature measuring unit according to an embodiment of the present invention.
Figure 7 is a diagram showing the operation of the temperature measuring unit according to the present invention.
Figure 8 is a side view of an electrode drying apparatus according to another embodiment of the present invention.
Figure 9 is a schematic diagram of an infrared heater according to an embodiment of the present invention.
Figure 10 is an exploded perspective view of a screen unit according to an embodiment of the present invention.
Figure 11 is a flowchart of an electrode drying method according to an embodiment of the present invention.

Since the present invention can be subject to various changes and have various forms, specific embodiments will be illustrated in the drawings and described in detail in the text. However, this is not intended to limit the present invention to a specific disclosed form, and should be understood to include all changes, equivalents, and substitutes included in the spirit and technical scope of the present invention.

In this application, terms such as “comprise” or “have” are intended to designate the presence of features, numbers, steps, operations, components, parts, or combinations thereof described in the specification, but are not intended to indicate the presence of one or more other features. It should be understood that this does not exclude in advance the possibility of the existence or addition of elements, numbers, steps, operations, components, parts, or combinations thereof. Additionally, when a part of a layer, membrane, region, plate, etc. is said to be “on” another part, this includes not only being “directly above” the other part, but also cases where there is another part in between. Conversely, when a part of a layer, membrane, region, plate, etc. is said to be "under" another part, this includes not only being "right underneath" that other part, but also cases where there is another part in between. Additionally, in this application, being placed “on” may include being placed not only at the top but also at the bottom.

In this specification, the x-axis is the direction in which the electrode sheet is transported, the y-axis is the width direction of the electrode sheet or the longitudinal direction of the infrared heater, and the z-axis is the direction perpendicular to the plane of the electrode sheet, corresponding to the direction of irradiation of infrared rays or the direction of injection of hot air. do.

Hereinafter, the electrode drying apparatus of the present invention will be described.

Figure 1 is a side view of an electrode drying apparatus according to an embodiment of the present invention, Figure 2 is a top view of an electrode drying apparatus according to an embodiment of the present invention, and Figure 3 is an electrode drying apparatus according to an embodiment of the present invention. It is a block diagram of the device, and Figure 4 is a perspective view of a portion of the electrode drying device according to an embodiment of the present invention.

As shown in FIG. 1, the electrode sheet 10 dried by the drying apparatus 100 of the present invention includes a sheet-shaped current collector 12 and an electrode slurry applied to one surface of the current collector 12. Includes (11). That is, the electrode sheet 10 of the present invention is manufactured by coating the electrode slurry 11 on one side of a conveyed sheet-shaped current collector, and the electrode sheet 10 manufactured in this way is used in the electrode drying apparatus 100 of the present invention. ), the electrode slurry 11 is dried.

The electrode drying apparatus 100 according to an embodiment of the present invention includes a drying furnace 110 that provides a space for drying the electrode sheet, a drying means 120 for drying the electrode sheet, and measuring the current collector temperature of the electrode sheet. A temperature measuring unit 130 that determines the drying level of the electrode sheet based on the temperature measured by the temperature measuring unit, and a control unit 140 and transfer unit 150 that control the drying conditions of the drying means according to the drying level. may include.

In the electrode drying device according to the present invention, the temperature measuring unit contacts the current collector in the electrode sheet and determines the drying level of the electrode sheet based on the current collector temperature, compared to the conventional method of indirectly measuring the temperature to determine the drying level. Compared to the technology, the accuracy of determining the electrode dryness level is improved.

The drying furnace 110 provides a space where the electrode sheet 10 coated with the electrode slurry 11 on the current collector 12 travels and dries.

The drying furnace 110 has a chamber shape, temporarily accommodates the electrode to be dried during the drying process, and can prevent internal heat from escaping to the outside for drying.

The current collector is wound on a separate unwinding roller (not shown) and then unwound from it. Electrode slurry is applied to at least one surface of the unwound current collector. In this case, the electrode slurry may be applied, for example, by a slot die (not shown). The electrode sheet 10 coated with the electrode slurry in this way is put into the drying furnace 110 and dried while the solvent in the electrode slurry is removed by the drying means 120.

The drying furnace 110 may be divided into a plurality of drying zones. If over-drying or under-drying occurs during the drying process of the electrode, it is necessary to dry the electrode to an appropriate drying level by changing the drying intensity. By dividing the drying furnace into multiple drying zones, the drying conditions can be set independently for each drying zone. It can be managed.

Each drying zone may be a space physically partitioned by actually installing an inner wall between one drying zone and the other drying zone, or it may be a space abstractly partitioned according to the drying conditions performed in the drying zone.

The drying means 120 is installed inside the drying furnace 110 and supplies hot air and/or infrared rays toward the electrode slurry 11 to dry the electrode slurry.

In one specific example, the drying means 120 includes an infrared heater 121 configured to irradiate infrared rays toward the electrode slurry; and a hot air supply unit 122 configured to spray hot air toward the electrode slurry.

The infrared heater 121 is a drying means that is disposed higher than the height (z-axis direction) of the electrode sheet 10 and emits radiant heat toward the electrode sheet 10 below. The infrared heater may include an infrared lamp that radiates infrared rays and a holder (not shown) that supports or mounts the infrared lamp (not shown). There are no particular restrictions on the shape of the infrared lamp.

The electrode drying apparatus according to an embodiment of the present invention may include a plurality of infrared heaters, and as shown in FIG. 2, the plurality of infrared heaters 121 operate in the running direction (x) of the electrode sheet 10. It can be placed at regular intervals along the axis direction.

The hot air supply unit 122 is not particularly limited as long as it has a form that can spray heated air toward the electrode sheet. An electrode drying device that includes a hot air supply unit in addition to an infrared heater has the advantage of further increasing drying efficiency.

Figure 5 is a diagram showing a temperature measuring unit according to an embodiment of the present invention, Figure 6 is a cross-sectional view of a temperature measuring unit according to an embodiment of the present invention, and Figure 7 is a drawing showing the operation of the temperature measuring unit according to the present invention. .

When described with reference to these drawings and FIG. 4, the temperature measuring unit 130 according to an embodiment of the present invention includes a thermistor (131) that detects the temperature of the surface of the current collector; An elastic member 132 coupled to one side of the thermistor 131; and a housing 133 having a space therein for accommodating the thermistor 131 and the elastic member 132.

The housing 133 has an internal space capable of accommodating the thermistor 131 and the elastic member 132, and the thermistor 131 and the elastic member 132 are inserted into the interior of the housing.

The housing 133 may be configured to couple the temperature measuring unit 130 to one side of the drying means frame corresponding to the external skeleton of the drying means 120, and forms one body together with the frame of the drying means. You may.

The thermistor 131 may be a temperature sensing element made of a sintered semiconductor material that shows a large change in resistance in proportion to a small change in temperature. These thermistors are mainly made of polymer or ceramic materials and are effective in measuring temperature with high accuracy between 90 and 150 degrees Celsius.

The elastic member 132 may be coupled to one end of the thermistor 131. The elastic member 132 functions to prevent curl from partially occurring in the current collector as the thermistor 131 contacts the current collector of the electrode sheet running inside the drying furnace.

In one specific example, as shown in FIGS. 5 to 7, it is preferable that the end portion of the thermistor 131 that contacts the current collector 12 has a round shape. At this time, the distal end of the thermistor has a convex shape toward the electrode sheet. When the distal end of the thermistor has a round shape, the contact area between the thermistor 131 and the current collector 12 can be minimized to reduce the possibility of surface damage to the current collector.

The control unit 140 determines the drying level of the electrode sheet based on the temperature value measured by the temperature measuring unit 130, and controls the operation of the drying means 120 according to the determined drying level. .

When the temperature measurement unit 130 inputs the temperature measurement result to the control unit 140, the control unit 140 processes the input measurement result with an operation program, determines the dryness level of the electrode sheet, and determines the dryness level of the electrode sheet. If the level does not meet the standard, the drying level is corrected by changing the drying conditions of the drying means.

In one specific example, the calculation program may include an equation for calculating the drying level of the electrode according to variables such as the temperature of the current collector surface, the loading amount of the electrode slurry, and the solid content of the electrode slurry.

This calculation formula accumulates a number of data representing the electrode drying level according to the temperature of the current collector surface, data representing the electrode drying level according to the loading amount of the electrode slurry, and data representing the electrode drying level according to the content of the electrode slurry solid content, It can be derived by statistically analyzing accumulated data.

Even under the same drying conditions, the temperature of the surface of the current collector of the electrode sheet, the loading amount of the electrode slurry, and the solid content of the electrode slurry affect the drying level of the electrode sheet, so the above calculation formula for determining the drying level of the present invention is: It includes factors.

When the drying level of the electrode sheet determined through the calculation program does not meet the standard and is determined to be overdry or underdry, the control unit 140 controls the wind speed of the hot air, the temperature of the hot air, and the output of the infrared heater. By changing one or more drying conditions, the level of drying can be corrected. Specifically, when the drying level of the electrode sheet is judged to be overdrying, the operation of the hot air supply unit and/or the infrared heater is controlled to reduce the temperature of the hot air, the speed of the hot air, and the output of the infrared heater, and conversely, drying the electrode sheet. If the level is determined to be underdry, the drying level of the electrode sheet can be corrected to an appropriate level by controlling the operation of the hot air supply unit and/or the infrared heater to increase the temperature of the hot air, the speed of the hot air, and the output of the infrared heater. You can.

The transfer unit 150 serves as a means for transferring the electrode sheet 10 in the transfer direction (x-axis direction) and may include one or more transfer rollers. The transfer roller supports the electrode sheet, moves the electrode sheet in the transfer direction by rotational movement, and may further include a motor (not shown) that applies rotational force to the transfer roller.

Figure 8 is a side view of an electrode drying device according to another embodiment of the present invention, Figure 9 is a schematic diagram of an infrared heater according to an embodiment of the present invention, and Figure 10 is an exploded view of a shield unit according to an embodiment of the present invention. It is a perspective view.

The electrode drying apparatus 200 according to another embodiment of the present invention includes a drying furnace 210, a drying means 220, a temperature measuring unit 230, a control unit (not shown), and a transfer unit 250. A shield unit 260 may be coupled to some of the infrared heaters 221 constituting the drying means 220.

The shield unit 260 has a structure that can block part of the radiant heat emitted from the infrared heater 221, and is formed around the boundary between the holding part to which the electrode slurry is applied and the uncoated part to which the electrode slurry is not applied, due to drying deviation. It is installed to alleviate the occurrence of heat wrinkles.

The shield unit 260 is used to control the location and area of the area to which radiant heat emitted from the infrared heater 221 is irradiated, and is installed close to the infrared heater 221. The size and shape of the shield unit 260 are not particularly limited, and may have a shape corresponding to the size and shape of the infrared heater. For example, if the infrared heater is rod-shaped, the infrared heater may also be rod-shaped.

In one specific example, the shield unit 260 includes first and second shielding units 261a and 261b configured to shield one side and the other side of the infrared heater 221 in the longitudinal direction (y); And a screen 261 that connects the first and second shields, but includes first and second connection parts 261c and 261d arranged to be spaced apart from each other; A base plate 262 disposed on the bottom of the screen 261 and supporting the screen; And it may include a fixing clamp 263 configured to have one end coupled to the base plate 262 and the other end coupled to the infrared heater 221.

The screen 261 and the base plate 262 have a rectangular frame shape with a rectangular through hole in the center. Infrared rays emitted from the infrared heater 221 may be irradiated to the electrode sheet through the hole.

The shield 261 mounted on the base plate 262 is provided with first and second shielding portions 261a and 261b, and the first and second shielding portions allow radiant heat emitted from the infrared heater to be applied to the electrode sheet 10. It functions to block irradiation.

The screen 261 has a first shielding part 261a on the left, a second shielding part 261b on the right, a first connection part 261c on the upper side, and a second connecting part on the lower side, centered around a hole provided in the center. (261d) is located.

The first and second shielding parts 261a and 261ㅠ may be located above the areas where thermal wrinkles occur, for example, the edges of both sides of the electrode sheet or the boundary between the holding part and the uncoated part. there is. By adjusting the areas of the first and second shielding parts, the increase or decrease in radiant heat to be blocked can be adjusted.

The first and second connection parts 261c and 261d each have a predetermined width and extend along the longitudinal direction (y-axis direction) of the infrared heater.

The screen is preferably made of stainless steel because it undergoes thermal deformation easily in a high temperature environment of 100°C to 150°C, and its thickness may be 0.5 to 10 mm.

The drying furnace 210 includes a first drying zone in which an infrared heater 221 to which the shield unit 260 is not coupled is disposed, and a first drying zone in which an infrared heater 221 to which the shield unit 260 is coupled is disposed. It can be divided into 2 drying zones.

In this case, the temperature measuring unit 230 may be placed in the first drying zone and not in the second drying zone.

This means that when the temperature measuring unit 230 of the present invention is placed in the second drying zone, the shield unit coupled to the infrared heater ensures that the heat energy emitted from the hot air supply unit and/or the infrared heater is transferred to the current collector. This is because there is a risk that the accuracy of temperature measurement values may be reduced by partially blocking it.

Hereinafter, an electrode drying method according to the present invention will be described.

Figure 11 is a flowchart of an electrode drying method according to an embodiment of the present invention. Referring to Figure 11, an electrode drying method according to an embodiment of the present invention includes the process of measuring the temperature of an electrode sheet running inside a drying furnace; A process of determining the dryness level of the electrode sheet from the measured temperature value; And when the determined drying level does not meet the standard, it includes a process of changing drying conditions.

The electrode drying method of the present invention uses a temperature measuring member configured to contact the current collector of the electrode sheet and measure the temperature of the surface of the current collector in the process of measuring the temperature in order to accurately determine the drying level of the electrode sheet. It is characterized by

The temperature measuring member may be a temperature measuring part of the electrode drying device according to the present invention described above, and this temperature measuring member includes: a thermistor that senses the temperature of the surface of the current collector; An elastic member coupled to one side of the thermistor; And it may include a housing having a space for accommodating the thermistor and the elastic member. The end portion of the thermistor that contacts the current collector may have a round shape.

Since detailed information about the thermistor, elastic member, and housing that constitutes the temperature measuring member has been previously described, further description will be omitted.

The process of determining the drying level is based on the variables of the temperature of the current collector surface measured in the process of measuring the temperature, the loading amount of the electrode slurry applied to the electrode sheet, and the solid content of the electrode slurry. The drying level of the electrode sheet may be determined using a calculation program that calculates .

The process of changing the drying conditions may be to correct the drying level of the electrode sheet by changing one or more drying conditions among the wind speed and temperature of the hot air supplied to the electrode sheet and the output of the infrared heater irradiated to the electrode sheet.

In the electrode drying device and electrode drying method of the present invention, the temperature measuring unit or temperature measuring member directly contacts the surface of the current collector, measures the temperature of the surface of the current collector, and determines the drying level of the electrode based on this, The accuracy of drying level judgment has been improved.

100, 200: Electrode drying device.
110, 210: Drying furnace
120, 220: drying means
121, 221: Infrared heater
122, 222: Hot air supply unit
130, 230: Temperature measurement unit
140: control unit
150, 250: Transfer unit
260: Screen unit
10: electrode sheet

Claims (15)

A drying furnace that provides a space where the electrode sheet coated with the electrode slurry on the current collector runs and dries;
Drying means installed inside the drying furnace and drying the electrode slurry by supplying hot air and/or infrared rays toward the electrode slurry;
a temperature measuring unit that contacts the current collector and measures the temperature of the surface of the current collector; and
The measurement results of the temperature measuring unit are input, the measurement results are processed by an operation program, the drying level of the electrode sheet is determined, and if the determined drying level does not meet the standard, the drying conditions of the drying means are changed. An electrode drying device including a control unit that corrects the drying level.
The method of claim 1, wherein the temperature measuring unit,
Thermistor, which detects the temperature of the current collector surface;
An elastic member coupled to one side of the thermistor; and
The electrode drying device comprising a housing having a space therein for accommodating the thermistor and the elastic member.
The electrode drying apparatus according to claim 2, wherein the end portion of the thermistor that contacts the current collector has a round shape.
The electrode drying apparatus according to claim 1, wherein the calculation program includes an equation for calculating the drying level of the electrode according to variables such as the temperature of the current collector surface, the loading amount of the electrode slurry, and the solid content of the electrode slurry.
The method of claim 1, wherein the drying means is:
an infrared heater configured to irradiate infrared rays toward the electrode slurry; and
An electrode drying device including a hot air supply unit configured to spray hot air toward the electrode slurry.
The electrode drying device according to claim 5, wherein the control unit corrects the drying level by changing one or more drying conditions among the wind speed of the hot air, the temperature of the hot air, and the output of the infrared heater.
The method of claim 5, wherein the drying means includes a plurality of infrared heaters,
An electrode drying device in which a plurality of infrared heaters are arranged at regular intervals along the traveling direction of the electrode sheet.
The method of claim 7, wherein some of the infrared heaters are combined with a screen unit to block some of the radiant heat emitted from the infrared heater,
The shield unit includes first and second shielding units configured to shield one side and the other side in the longitudinal direction of the infrared heater; And a screen connecting the first and second shielding parts, but including first and second connecting parts arranged to be spaced apart from each other; and
An electrode drying device comprising a base plate disposed on the bottom of the screen and supporting the screen.
The method of claim 8, wherein the drying furnace is divided into a first drying zone in which an infrared heater to which the screen unit is not coupled is disposed, and a second drying zone in which an infrared heater to which the screen unit is coupled is disposed,
The temperature measuring unit is an electrode drying device disposed in the first drying zone.
The electrode drying apparatus according to claim 9, wherein the temperature measuring unit is not disposed in the second drying zone.
A process of measuring the temperature of the electrode sheet running inside the drying furnace;
A process of determining the dryness level of the electrode sheet from the measured temperature value; and
If the determined drying level does not meet the standard, including a process of changing drying conditions,
The process of measuring the temperature is an electrode drying method characterized by using a temperature measuring member configured to measure the temperature of the surface of the current collector by contacting the current collector of the electrode sheet.
The method of claim 11, wherein the process of determining the drying level is based on the variables of the temperature of the current collector surface measured in the process of measuring the temperature, the loading amount of the electrode slurry applied to the electrode sheet, and the solid content of the electrode slurry. Accordingly, an electrode drying method that determines the dryness level of the electrode sheet using a calculation program that calculates the dryness level of the electrode.
The method of claim 11, wherein the temperature measuring member,
Thermistor, which detects the temperature of the current collector surface;
An elastic member coupled to one side of the thermistor; and
An electrode drying method comprising a housing having a space for accommodating the thermistor and the elastic member.
The electrode drying method according to claim 13, wherein the end portion of the thermistor that contacts the current collector has a round shape.
The method of claim 11, wherein the process of changing the drying conditions includes correcting the drying level of the electrode sheet by changing one or more drying conditions among the wind speed and temperature of the hot air supplied to the electrode sheet and the output of the infrared heater irradiated to the electrode sheet. Electrode drying method.