KR20210118620A - Winding apparatus of electrode assembly and winding method of electrode assembly - Google Patents

Abstract

The present invention relates to an electrode assembly winding apparatus to easily identify defects in a manufacturing process and an electrode assembly winding method thereof. According to one embodiment of the present invention, the electrode assembly winding apparatus comprises: a first moving member continuously moving a first separator and a first electrode in a first direction; a second moving member continuously moving a second separator and a second electrode in a second direction; a winding core winding the first separator, the first electrode, the second separator, and the second electrode together at a point where the first direction and the second direction intersect; and an inspection unit measuring the position of at least one of both ends of the first electrode and both ends of the second electrode during winding. The first separator, the first electrode, the second separator, and the second electrode are wound around the winding core to form a wound body.

Description

Electrode assembly winding device and electrode assembly winding method

The present invention relates to an electrode assembly winding apparatus and an electrode assembly winding method, and more particularly, to an electrode assembly winding apparatus capable of easily discriminating a defect in a manufacturing process, and an electrode assembly winding method using the same.

Recently, an increase in the price of an energy source due to the depletion of fossil fuels, interest in environmental pollution is amplified, and the demand for an eco-friendly alternative energy source is becoming an indispensable factor for future life. Accordingly, research on various power generation technologies such as nuclear power, solar power, wind power, and tidal power is continuing, and power storage devices for using the generated energy more efficiently are also of great interest.

In particular, as technology development and demand for mobile devices increase, the demand for secondary batteries as an energy source is rapidly increasing, and accordingly, a lot of research on secondary batteries capable of meeting various needs is being conducted.

Typically, there is a high demand for lithium secondary batteries, such as lithium ion batteries and lithium ion polymer batteries, which have advantages such as high energy density, discharge voltage, and output stability.

The secondary battery may include a positive electrode and a negative electrode. The positive electrode consists of a positive electrode coated portion coated with a positive electrode active material on the positive electrode current collector and an uncoated positive electrode uncoated portion, and in the case of the negative electrode, a negative electrode coated portion coated with a negative electrode active material on the negative electrode current collector and an uncoated negative electrode uncoated portion have. An electrode tab is installed in the positive electrode uncoated region and the negative electrode uncoated region, respectively.

A porous separator is interposed between the positive electrode and the negative electrode, and this separator insulates between the positive electrode and the negative electrode and at the same time allows the active material ions to be exchanged between the electrodes, thereby causing an electrochemical reaction.

Such secondary batteries are also classified according to the structure of an electrode assembly in which a positive electrode, a negative electrode, and a separator interposed between the positive and negative electrodes are stacked. Representatively, a jelly roll (winding type) electrode assembly having a structure in which long sheet-shaped positive and negative electrodes are wound with a separator interposed therebetween, and a plurality of positive and negative electrodes cut in units of a predetermined size with a separator interposed therebetween. and stack-type (stacked-type) electrode assemblies stacked sequentially. Recently, in order to solve the problems of the jelly roll electrode assembly and the stacked electrode assembly, as a mixed form of the jelly roll and the stack type, unit cells in which positive and negative electrodes of a predetermined unit are stacked with a separator interposed therebetween are separated A stack/folding type electrode assembly having a structure in which it is sequentially wound while placed on a film has been developed.

On the other hand, an electrode assembly winding apparatus may be used to manufacture a jelly roll electrode assembly, and FIG. 1 is a view showing a conventional electrode assembly winding apparatus. Specifically, an apparatus for winding a positive electrode, a negative electrode, and a separator in order to manufacture a jelly roll electrode assembly is shown.

Referring to FIG. 1 , the conventional electrode assembly winding device 1 winds the negative electrode 11 , the positive electrode 12 , the first separator 21 , and the second separator 22 to produce the electrode assembly 10 . is formed

For example, the electrode assembly winding device 1 is a first to fourth supply rollers (R11, R12, R13, R14), first to fourth transfer rollers (R21, R22, R23, R24), nip roller (R5) ) and the core (M).

The first supply roller R11 may supply the wound strip-shaped negative electrode 11 , and the second supply roller R12 may supply the wound belt-shaped positive electrode 12 .

The third supply roller R13 may supply the wound belt-shaped first separation membrane 21 , and the fourth supply roller R14 may supply the wound belt-shaped second separation film 22 .

The first and second feed rollers R21 and R22 may guide the cathode 11 and the anode 12 respectively supplied from the first and second feed rollers R11 and R12. The third and fourth transfer rollers R23 and R24 may guide the first separation membrane 21 and the second separation membrane 22 supplied from the third and fourth supply rollers R13 and R14, respectively.

The nip roller R5 is a first nip roller R51 that collects and transports the cathode 11 and the first separator 21 in one place, and a second nip roller R51 that collects and transports the anode 12 and the second separator 22 to one place. It may include a nip roller (R52).

The negative electrode 11 , the first separator 21 , the positive electrode 12 , and the second separator 22 guided by the first and second nip rollers R51 and R52 are wound on the core M in a jelly roll state. can be

In this manufacturing process, control and inspection may be performed so that the position of the positive electrode 12 does not deviate from the position of the negative electrode 11 . In particular, the timing at which the position control is required is the starting end of the winding of the positive electrode 12 and the negative electrode 11 at the initial stage of winding, the width direction position of the positive electrode 12 and the negative electrode 11 during winding, and the positive electrode 12 and the negative electrode when winding is completed. (11) winding end, etc. Mainly, it is managed using an electrode transfer motor, an encoder of an electrode, an EPC (Edge Position Control) device, an X-ray inspection machine, and the like.

At this time, the position in the width direction of the positive electrode 12 and the negative electrode 11 may be inspected using X-Ray, but the positions at the winding start end and the winding end of the negative electrode 11 of the positive electrode 12 are separately transmitted. There is no inspection in place. Instead, CT inspection and destructive inspection can be performed on the winding start end and end point of the negative electrode 11 of the positive electrode 12, but there is a problem that it takes a long time and the complete inspection is impossible due to product damage.

Embodiments of the present invention are proposed to solve the above problems of the previously proposed methods, and by directly inspecting the positions of the positive and negative electrodes during the winding process, an electrode assembly capable of easily discriminating defects in the manufacturing process An object of the present invention is to provide a winding device and a method for winding an electrode assembly using the same.

However, the problems to be solved by the embodiments of the present invention are not limited to the above problems and may be variously expanded within the scope of the technical idea included in the present invention.

An electrode assembly winding apparatus according to an embodiment of the present invention includes: a first moving member for continuously moving a first separator and a first electrode in a first direction; a second moving member that continuously moves the second separator and the second electrode in a second direction; a winding core for winding the first separator, the first electrode, the second separator, and the second electrode together at a point where the first direction and the second direction intersect; and an inspection unit measuring at least one of both ends of the first electrode and both ends of the second electrode during the winding, wherein the first separator, the first electrode, the second separator, and the second electrode It is wound around the core to form a winding body.

The inspection unit may measure a first distance between a lower side of the winding body and one end of the wound first electrode when the winding body is viewed from one side.

The inspection unit may measure a second distance between an upper side of the winding body and one end of the second electrode before being wound, when the winding body is viewed from one side.

The inspection unit may measure a third distance between an upper side of the winding body and one end of the wound first electrode when the winding body is viewed from one side.

The inspection unit may measure a fourth distance between an upper side of the winding body and the other end of the wound second electrode when the winding body is viewed from one side.

The inspection unit may measure a fifth distance between an upper side of the winding body and the other end of the wound first electrode when the winding body is viewed from one side.

An electrode assembly winding method according to an embodiment of the present invention includes a first moving step of continuously moving a first separator and a first electrode in a first direction; a second moving step of continuously moving the second separator and the second electrode in a second direction; a winding step of winding the first separator, the first electrode, the second separator, and the second electrode together to form a winding body at a point where the first direction and the second direction intersect; and measuring a position of at least one of both ends of the first electrode and both ends of the second electrode during the winding.

The inspection step may include a first inspection step of measuring a first distance between a lower side of the winding body and one end of the wound first electrode when the winding body is viewed from one side.

The inspection step may include a second inspection step of measuring a second distance between an upper side of the winding body and one end of the second electrode before being wound, when the winding body is viewed from one side.

The inspection step may include a third inspection step of measuring a third distance between an upper side of the winding body and one end of the wound first electrode when the winding body is viewed from one side.

The inspection step may include a fourth inspection step of measuring a fourth distance between an upper side of the winding body and the other end of the wound second electrode when the winding body is viewed from one side.

The inspection step may include a fifth inspection step of measuring a fifth distance between an upper side of the winding body and the other end of the wound first electrode when the winding body is viewed from one side.

According to embodiments of the present invention, in the winding process, by directly inspecting the positions of the positive and negative electrodes through the inspection unit that detects the winding start end and the winding end of the positive electrode and the negative electrode with respect to the winding body, it is easy to determine the defect in the manufacturing process can do.

Determination through the inspection unit may be made during the winding process, so that destructive inspection is unnecessary, thereby reducing waste of electrode assembly products.

1 is a view showing a conventional electrode assembly winding device.
2 is a view showing an electrode assembly winding apparatus according to an embodiment of the present invention.
FIG. 3 is an enlarged view of part “A” of FIG. 2 .
4A and 4B are views illustrating a state in which a first separation membrane and a second separation membrane are inserted into a slit of a winding core from different directions;
5A and 5B are views showing the winding body at the time of input of the first electrode from different directions.
6A and 6B are views showing the winding body at the time of winding the first electrode from different directions.
7A and 7B are views showing the winding body at the time of input of the second electrode from different directions.
8A and 8B are views showing the winding body at the time of completion of winding from different directions.
FIG. 9 is an enlarged view of part “B” of FIG. 8A .

Hereinafter, with reference to the accompanying drawings, various embodiments of the present invention will be described in detail so that those of ordinary skill in the art can easily implement them. The present invention may be embodied in many different forms and is not limited to the embodiments described herein.

In order to clearly explain the present invention, parts irrelevant to the description are omitted, and the same reference numerals are given to the same or similar elements throughout the specification.

In addition, since the size and thickness of each component shown in the drawings are arbitrarily indicated for convenience of description, the present invention is not necessarily limited to the illustrated bar. In order to clearly express various layers and regions in the drawings, the thicknesses are enlarged. And in the drawings, for convenience of description, the thickness of some layers and regions are exaggerated.

Also, when a part of a layer, film, region, plate, etc. is said to be “on” or “on” another part, it includes not only cases where it is “directly on” another part, but also cases where there is another part in between. . Conversely, when we say that a part is "just above" another part, we mean that there is no other part in the middle. In addition, to be "on" or "on" the reference part means to be located above or below the reference part, and to necessarily mean to be located "on" or "on" in the direction opposite to gravity no.

In addition, throughout the specification, when a part "includes" a certain component, this means that other components may be further included, rather than excluding other components, unless otherwise stated.

In addition, throughout the specification, when referring to "planar", it means when the target part is viewed from above, and "in cross-section" means when viewed from the side when a cross-section of the target part is vertically cut.

FIG. 2 is a view showing an electrode assembly winding apparatus according to an embodiment of the present invention, and FIG. 3 is an enlarged view of part “A” of FIG. 2 .

Referring to FIGS. 2 and 3 , the electrode assembly winding apparatus 100 according to an embodiment of the present invention provides a first method for continuously moving a first separator 500 and a first electrode 300 in a first direction. The second moving member 120 continuously moves the moving member 110 , the second separator 600 , and the second electrode 400 in the second direction, and the first moving member 120 at a point where the first direction and the second direction intersect. A core 130 for winding the separator 500, the first electrode 300, the second separator 600, and the second electrode 400 together, and both ends of the first electrode 300 and the second electrode ( The inspection unit 140 for measuring the position of at least one of both ends of the 400) is included.

At this time, the first separator 500 , the first electrode 300 , the second separator 600 , and the second electrode 400 may be a rectangular sheet, and are wound around the core 130 to form the winding body 200 . can do. Here, the winding body 200 includes a first separator 500 , a first electrode 300 , a second separator 600 , and a second electrode 400 wound around a core 130 to form a jelly roll electrode assembly. means absence.

The first electrode 300 may be a cathode, and the second electrode 400 may be an anode. In more detail, the first electrode 300 may be a negative electrode coated with an anode active material on a negative electrode current collector, and the second electrode 400 may be a positive electrode coated with a positive electrode active material on a positive electrode current collector.

The first moving member 110 may include equipment such as rollers and guide rollers to continuously move the first electrode 300 in the first direction. Similarly, the second moving member 120 may be provided with equipment such as rollers and guide rollers to continuously move the second electrode 400 in the second direction. Also, although not specifically shown, the first moving member 110 may continuously move the first separation membrane 500 in the first direction through equipment such as an additional roller, and the second moving member 120 may use an additional roller The second separation membrane 600 may be continuously moved in the second direction through equipment such as.

The inspection unit 140 may include a first sensor unit 141 , a second sensor unit 142 , a third sensor unit 143 , a fourth sensor unit 144 , and a fifth sensor unit 145 .

Through the first to fifth sensor units 141 , 142 , 143 , 144 , and 145 , the inspection unit 140 determines the positions of both ends of the first electrode 300 with respect to the winding body 200 and the second electrode 400 . By directly measuring the positions of both ends of , it is possible to detect that the first electrode 300 and the second electrode 400 deviate from their positions during the winding process. It will be described in detail below.

4A and 4B are views illustrating a state in which the first separator 500 and the second separator 600 are inserted into the slit 131 of the winding core 130 from different directions. Specifically, FIG. 4A is a view viewed from a direction parallel to the extension direction of the winding core 130 , and FIG. 4B is a view viewed from a direction perpendicular to the extension direction of the winding core 130 .

4A and 4B , the first separator 500 and the second separator 600 are inserted into the slit 131 of the winding core 130 to prepare for winding. As the winding core 130 rotates in this state, winding starts.

5A and 5B are views illustrating the winding body 200 at the time of input of the first electrode 300 from different directions. Specifically, FIG. 5A is a view of the winding body 200 in a direction parallel to the extension direction of the winding core 130 , and FIG. 5B is a view of the winding body 200 in a direction perpendicular to the extension direction of the winding core 130 . look. Here, the state shown in FIG. 5B shows the state in which the inspection unit 140 shown in FIG. 3 recognizes the winding body 200 .

Meanwhile, when the first electrode 300 is inserted, the first separator 500 and the second separator 600 are already wound on the core 130 , and the first electrode 300 is the first separator 500 . It means the moment when it is inserted through between the and the second separator 600 . Also, here, the second electrode 400 is not yet inserted.

When designing the jelly roll electrode assembly, the area of the negative electrode may be set larger than that of the corresponding positive electrode in order to prevent lithium from being deposited on the negative electrode. Accordingly, the first electrode 300 corresponding to the negative electrode may be wound around the core 130 before the second electrode 400 corresponding to the positive electrode.

As described above, as the first electrode 300 is inserted between the first separator 500 and the second separator 600 , the winding of the first electrode 300 starts.

6A and 6B are views illustrating the winding body 200 at the time of winding the first electrode 300 from different directions. Specifically, FIG. 6a is a view of the winding body 200 in a direction parallel to the extension direction of the winding core 130 , and FIG. 6b is a view of the winding body 200 in a direction perpendicular to the extension direction of the winding core 130 . am. Here, the state shown in FIG. 6B shows the state in which the inspection unit 140 shown in FIG. 3 recognizes the winding body 200 .

Hereinafter, in the present specification, the state of looking at the winding body 200 from one side means that the inspection unit 140 of FIG. It means recognizing

The winding-up time of the first electrode 300 may refer to a moment in which the first electrode 300 is wound about 0.5 times after the first electrode 300 is inserted as shown in FIGS. 6A and 6B . Also, the second electrode 400 may not yet be inserted here.

Referring to FIGS. 3, 6A and 6B , the inspection unit 140 through the first sensor unit 141, when looking at the winding body 200 from one side, the lower side 220 of the winding body 200 ) and the first distance d1 between the one end 310 of the wound first electrode 300 may be measured. Here, one end 310 of the first electrode 300 means a winding start end of the first electrode 300 inserted first among the first electrodes 300 .

At this time, since the first separator 500 has a predetermined transmittance, the inspection unit 140 has one end ( 310) can be recognized.

At the time of winding the first electrode 300 , if the first distance d1 measured through the first sensor unit 141 does not correspond to a preset range, it is determined that a defect has occurred in the winding process of the electrode assembly. can For example, when the first distance d1 measured for a preset time range after the first electrode 300 starts to move by the first moving member 110 does not correspond to the preset distance range, a defect has occurred. can judge The preset time range or distance range may vary according to design or equipment conditions.

7A and 7B are views showing the winding body 200 from different directions when the second electrode 400 is inserted. Specifically, FIG. 7A is a view of the winding body 200 in a direction parallel to the extension direction of the winding core 130 , and FIG. 7B is a view of the winding body 200 in a direction perpendicular to the extension direction of the winding core 130 . look. Here, the state shown in FIG. 7B shows the state in which the inspection unit 140 shown in FIG. 3 recognizes the winding body 200 .

Here, when the second electrode 400 is inserted, the second electrode 400 is inserted through between the second separator 600 and the winding body 200 as in FIGS. 7A and 7B , and the first electrode 300 is inserted into the first electrode 300 . ) may mean the moment after being inserted and wound about 0.8 times.

Referring to FIGS. 3, 7A and 7B , the inspection unit 140 through the second sensor unit 142, when looking at the winding body 200 from one side, the upper side 210 of the winding body 200 ) and the second distance d2 between the one end 410 of the second electrode 400 before being wound may be measured. Here, one end 410 of the second electrode 400 means a winding start end of the second electrode 400 inserted first among the second electrodes 400 .

When the second electrode 400 is inputted, if the second distance d2 measured through the second sensor unit 142 does not fall within the preset range, it is determined that a defect has occurred in the winding process of the electrode assembly. can For example, when the second distance d2 measured for a preset time range after the second electrode 400 starts to move by the second moving member 120 does not correspond to the preset distance range, a defect has occurred. can judge The preset time range or distance range may vary according to design or equipment conditions.

On the other hand, when the inspection unit 140 looks at the winding body 200 from one side through the third sensor unit 143 , the upper side 210 of the winding body 200 and the wound first electrode 300 . A third distance d3 between the ends 310 of the .

At this time, since the first separator 500 has a predetermined transmittance, the third sensor unit 143 can recognize the one end 310 of the first electrode 300 reflected through one sheet of the first separator 500 . have.

When the second electrode 400 is inputted, if the third distance d3 measured through the third sensor unit 143 does not correspond to the preset range, it is determined that a defect has occurred in the winding process of the electrode assembly. can For example, when the third distance d3 measured for a preset time range after the second electrode 400 starts to move by the second moving member 120 does not correspond to the preset distance range, a defect has occurred. can judge The preset time range or distance range may vary according to design or equipment conditions.

In addition, when the second distance d2 measured through the second sensor unit 142 and the third distance d3 measured through the third sensor unit 143 do not satisfy the preset criteria, the electrode assembly By setting it to be defective in the winding process of

8A and 8B are views showing the winding body 200 from different directions at the time of completion of winding, and FIG. 9 is an enlarged view of part “B” of FIG. 8A . Specifically, FIG. 8a is a view of the winding body 200 in a direction parallel to the extension direction of the winding core 130 , and FIG. 8b is a view of the winding body 200 in a direction perpendicular to the extension direction of the winding core 130 . look. Here, the state shown in FIG. 8B shows the state in which the inspection unit 140 shown in FIG. 3 recognizes the winding body 200 .

When the winding is completed, the other end 320 of the first electrode 300 is wound around the core 130 and the other end 420 of the second electrode 400 is the second as shown in FIGS. 8A, 8B and 9 . It may mean the moment when the separator 600 and the winding body 200 are inserted through.

Referring to FIGS. 3, 8A, 8B and 9 , the inspection unit 140 through the fourth sensor unit 144, when looking at the winding body 200 from one side, the winding body 200 A fourth distance d4 between the upper side 210 and the other end 420 of the wound second electrode 400 may be measured. Here, the other end 420 of the second electrode 400 refers to the winding end of the second electrode 400 inserted last among the second electrodes 400 .

When the winding is completed, when the fourth distance d4 measured through the fourth sensor unit 144 does not correspond to a preset range, it may be determined that a defect has occurred in the winding process of the electrode assembly. For example, when the fourth distance d4 measured for a preset time range after the input of the first electrode 300 or the second electrode 400 is stopped does not correspond to the preset distance range, it is determined that a defect has occurred can do. The preset time range or distance range may vary according to design or equipment conditions.

On the other hand, when the inspection unit 140 looks at the winding body 200 from one side through the fifth sensor unit 145 , the upper side 210 of the winding body 200 and the wound first electrode 300 . A fifth distance d5 between the other ends 320 of the may be measured. Here, the other end 320 of the first electrode 300 refers to the winding end of the first electrode 300 inserted last among the first electrodes 300 .

At this time, since the first separator 500 has a predetermined transmittance, the fifth sensor unit 145 can recognize the other end 320 of the first electrode 300 reflected through one sheet of the first separator 500 . have.

When the winding is completed, when the fifth distance d5 measured through the fifth sensor unit 145 does not correspond to the preset range, it may be determined that a defect has occurred in the winding process of the electrode assembly. For example, when the fifth distance d5 measured for a preset time range after the input of the first electrode 300 or the second electrode 400 is stopped does not correspond to the preset distance range, it is determined that a defect has occurred can do. The preset time range or distance range may vary according to design or equipment conditions.

The inspection unit 140 according to an embodiment of the present invention, through the sensor units 141, 142, 143, 144, 145, the upper side of the winding body 200 when the winding body 200 is viewed from one side. A distance between 210 and at least one of both ends 310 and 320 of the first electrode 300 and both ends 410 and 420 of the second electrode 400 may be measured. Also, the inspection unit 140 includes the lower side 220 of the winding body 200 and both ends 310 and 320 of the first electrode 300 and the second electrode 400 when the winding body 200 is viewed from one side. ) may measure a distance between at least one of both ends 410 and 420 .

Through the measurement process of the inspection unit 140, it is possible to directly measure and recognize the positions of the first and second electrodes 300 and 400 in the winding process of the electrode assembly, and based on this, a defect occurs in the winding process of the electrode assembly. It can be determined whether That is, since the entire inspection is performed, defects in the process can be more accurately determined, and since the finished product is not destroyed, the waste of the electrode assembly product can be reduced.

In this embodiment, the upper side 210 and the lower side 220 of the winding body 200 are, as in FIGS. 6b, 7b and 8b, the upper side and the upper side for the appearance when the winding body 200 is viewed from one side. means the bottom line.

On the other hand, the first to fifth sensor units in the present invention may be configured as each sensor as specified, but may be configured as a single sensor otherwise. That is, a single sensor may perform the functions of the above-mentioned first to fifth sensor units.

In addition, the first to fifth sensor units or the single sensor sense the positions of one end 310 and the other end 320 of the first electrode 300 and one end 410 and the other end 420 of the second electrode 400 . If possible, there is no particular limitation on the type, and vision or sensor type devices can be applied.

In addition, if necessary, it is possible to provide a light to illuminate the winding body 200 for more accurate detection.

Hereinafter, a method for winding an electrode assembly according to an embodiment of the present invention will be described. However, portions overlapping with those described above will be omitted.

3 to 9 , in the method of winding an electrode assembly according to an embodiment of the present invention, a first moving step in which the first separator 500 and the first electrode 300 are continuously moved in a first direction , a second moving step in which the second separator 600 and the second electrode 400 continuously move in the second direction, the first separator 500 at a point where the first direction and the second direction intersect A winding step of winding the first electrode 300, the second separator 600, and the second electrode 400 together to form a winding body 200, and both ends 310 and 320 of the first electrode 300 during the winding and an inspection step of measuring the position of at least one of both ends 410 and 420 of the second electrode 400 .

As described above, when the winding body 200 is viewed from one side, the inspection unit 140 of FIG. 3 recognizes the winding body 200 as shown in FIGS. 6b, 7b and 8b. it means.

6A and 6B, in the inspection step, when the winding body 200 is viewed from one side, the lower side 220 of the winding body 200 and one end of the wound first electrode 300 ( 310) may include a first inspection step of measuring a first distance d1 between them. The first inspection step may be performed at the time of winding the first electrode 300 described above.

In the first inspection step, when the measured first distance d1 does not correspond to a preset range, it may be determined that a defect has occurred in the winding process of the electrode assembly.

7A and 7B, in the inspection step, when the winding body 200 is viewed from one side, the upper side 210 of the winding body 200 and one end of the second electrode 400 before being wound A second inspection step of measuring a second distance d2 between the 410 may be included. The second inspection step may be performed at the input time of the above-described second electrode 400 .

In the second inspection step, when the measured second distance d2 does not correspond to a preset range, it may be determined that a defect has occurred in the winding process of the electrode assembly.

Meanwhile, in the inspection step, when the winding body 200 is viewed from one side, the third distance between the upper side 210 of the winding body 200 and the end 310 of the wound first electrode 300 . It may include a third inspection step of measuring (d3). The third inspection step may be performed at the input time of the above-described second electrode 400 .

In the third inspection step, when the measured third distance d3 does not correspond to a preset range, it may be determined that a defect has occurred in the winding process of the electrode assembly.

Meanwhile, the second inspection step and the third inspection step may be performed at the same time, and when the calculated values of the second distance d2 and the third distance d3 do not satisfy a preset criterion, the electrode assembly is wound. It can be determined that a defect has occurred in the process.

8A, 8B and 9 , in the inspection step, when the winding body 200 is viewed from one side, the upper side 210 of the winding body 200 and the wound second electrode 400 are It may include a fourth inspection step of measuring a fourth distance d4 between the other ends 420 of the . The fourth inspection step may be performed at the completion of the above-described winding.

In the fourth inspection step, when the measured fourth distance d4 does not correspond to a preset range, it may be determined that a defect has occurred in the winding process of the electrode assembly.

On the other hand, in the inspection step, when the winding body 200 is viewed from one side, the fifth distance between the upper side 210 of the winding body 200 and the other end 320 of the wound first electrode 300 . It may include a fifth inspection step of measuring (d5). The fifth inspection step may be made at the time of completion of the above-described winding.

In the fifth inspection step, when the measured fifth distance d5 does not correspond to a preset range, it may be determined that a defect has occurred in the winding process of the electrode assembly.

The inspection step in the electrode assembly winding method according to the present embodiment may include at least one of the first inspection step to the fifth inspection step. That is, when the winding body 200 is viewed from one side through the inspection step, the upper side 210 of the winding body 200 and both ends 310 and 320 of the first electrode 300 and the second electrode ( The distance between at least one of both ends 410 and 420 of 400 may be measured. In addition, when the winding body 200 is viewed from one side, the lower side 220 of the winding body 200 and both ends 310 and 320 of the first electrode 300 and both ends 410 of the second electrode 400 . , 420) may measure a distance between at least one of them. Through this inspection step, it is possible to more clearly determine whether a defect has occurred in the winding process of the electrode assembly.

Meanwhile, referring to FIGS. 4A and 4B , the method for winding an electrode assembly according to the present embodiment includes a winding preparation step of inserting the first separator 500 and the second separator 600 into the slit 131 of the winding core 130 . may include.

The winding preparation step is a step for preparing the winding, it is preferable to be made before the winding step. That is, the first separator 500 and the second separator 600 may be positioned in the slit 131 through the winding preparation step prior to the input of the first electrode 300 and the second electrode 400 .

In this embodiment, terms indicating directions such as front, back, left, right, up, and down are used, but these terms are for convenience of explanation only, and may vary depending on the position of the object or the position of the observer. .

Although the preferred embodiment of the present invention has been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements by those skilled in the art using the basic concept of the present invention as defined in the following claims are also provided. is within the scope of the

100: electrode assembly winding device
110: first moving member
120: second moving member
130: Kwon Shim
140: inspection unit
200: winding body
300: first electrode
400: second electrode
500: first separator
600: second separator

Claims (12)

a first moving member that continuously moves the first separator and the first electrode in a first direction;
a second moving member that continuously moves the second separator and the second electrode in a second direction;
a winding core for winding the first separator, the first electrode, the second separator, and the second electrode together at a point where the first direction and the second direction intersect; and
and an inspection unit for measuring a position of at least one of both ends of the first electrode and both ends of the second electrode during the winding,
and the first separator, the first electrode, the second separator, and the second electrode are wound around the core to form a winding body. In claim 1,
An electrode assembly winding device for measuring a first distance between the lower side of the winding body and one end of the wound first electrode when the inspection unit views the winding body from one side. In claim 1,
An electrode assembly winding device for measuring a second distance between the upper side of the winding body and one end of the second electrode before being wound by the inspection unit, when the winding body is viewed from one side. In claim 1,
An electrode assembly winding device for measuring a third distance between the upper side of the winding body and one end of the wound first electrode when the inspection unit views the winding body from one side. In claim 1,
An electrode assembly winding device for measuring a fourth distance between the upper side of the winding body and the other end of the wound second electrode by the inspection unit, when the winding body is viewed from one side. In claim 1,
An electrode assembly winding device for measuring a fifth distance between the upper side of the winding body and the other end of the wound first electrode when the inspection unit looks at the winding body from one side. a first moving step of continuously moving the first separator and the first electrode in a first direction;
a second moving step of continuously moving the second separator and the second electrode in a second direction;
a winding step of winding the first separator, the first electrode, the second separator, and the second electrode together to form a winding body at a point where the first direction and the second direction intersect; and
and an inspection step of measuring a position of at least one of both ends of the first electrode and both ends of the second electrode during the winding. In claim 7,
The inspection step includes a first inspection step of measuring a first distance between a lower side of the winding body and one end of the wound first electrode when the winding body is viewed from one side. . In claim 7,
The inspection step includes a second inspection step of measuring a second distance between the upper side of the winding body and one end of the second electrode before being wound, when the winding body is viewed from one side. Way. In claim 7,
The inspection step includes a third inspection step of measuring a third distance between an upper side of the winding body and one end of the wound first electrode when the winding body is viewed from one side. . In claim 7,
The inspection step includes a fourth inspection step of measuring a fourth distance between the upper side of the winding body and the other end of the wound second electrode when the winding body is viewed from one side. . In claim 1,
The inspection step includes a fifth inspection step of measuring a fifth distance between the upper side of the winding body and the other end of the wound first electrode when the winding body is viewed from one side. .

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