Patent Description:
In general, secondary batteries are batteries capable of being used repeatedly through a discharging process of converting chemical energy into electric energy and a charging process that is the reverse direction of the discharging process. Types of secondary batteries include a nickelcadmium (Ni-Cd) battery, a nickel-hydrogen (Ni-MH) battery, a lithium-metal battery, a lithium-ion (Ni-Ion) battery, and a lithium-ion polymer battery (hereinafter referred to as 'LIPB').

A secondary battery includes a positive electrode, a negative electrode, an electrolyte, and a separator, and stores and generates electricity by using a voltage difference between different positive and negative materials. Discharging is the movement of electrons from a high-voltage negative electrode to a low-voltage positive electrode (i.e., electricity is generated as much as the voltage difference between both electrodes), and charging is the movement of electrons from the positive electrode to the negative electrode again. The positive electrode material receives electrons and lithium ions to be retumed to an original metal oxide. A charging current flows as metal atoms move from the positive electrode to the negative electrode through the separator when a secondary battery is charged, and the metal atoms move from the negative electrode to the positive electrode and a discharging current flows when the secondary battery is discharged.

The field of quality control, that is the most basic in a battery manufactured by an electrode stacking method among the battery manufacturing methods, relates to whether electrode components are stacked in a normal order and arrangement. When any of the electrode components of the stacked battery is arranged in an abnormal order or is missing, the battery cannot be used as a battery due to a short circuit, abnormal operation, etc., and may explode in severe cases.

On the other hand, the methods for manufacturing such a secondary battery are divided into a winding method and a stacking method, and the stacking method is a method of alternately stacking positive and negative plates cut to a predetermined size to manufacture an electrode assembly. In this regard, <CIT>) is disclosed. However, in the past, there was a problem in that it was not possible to detect defects such as misalignment of the electrode plates and lifting in an electrode stacking process and the like such as that disclosed in <CIT>.

The invention is given in the claims. Accordingly, the present disclosure has been made keeping in mind the above problem occurring in the related art, and the present disclosure is intended to provide an apparatus for inspecting stacking of electrodes of a secondary battery to efficiently secure stacking alignment and stacking reliability in a stacking process of a secondary battery and an inspection method thereof.

In addition, the present disclosure is intended to provide an apparatus for inspecting stacking of electrodes of a secondary battery, in which reliability of an electrode stacking process of the secondary battery is inspected in real-time during the process, so that reliability of secondary battery manufacturing may be secured and a more precise electrode assembly may be manufactured, and an inspection method thereof.

An apparatus for inspecting stacking of electrodes of a secondary battery according to an embodiment of the present disclosure may include: a separator supply device configured to supply a separator; a stacking main body having a stacking table formed on a first surface thereof and configured to allow the separator to be stacked on the stacking table; a stacking jig configured to stack an electrode plate on the separator stacked on the stacking main body; a fixing jig configured to fix a first surface of the electrode plate in a stacking direction; a lighting device configured to emit light from a first surface of the stacking table to allow the light to pass through the separator and the electrode plate; and a capturing unit configured to capture an image of the light that has passed through the separator and the electrode plate, wherein the fixing jig is disposed on a path of the light that is emitted from the lighting device and passes through the separator and the electrode plate, and an open hole is formed on an extension line of the path of the light that passes through the separator and the electrode plate.

The stacking main body may include a rotary shaft and allows the separator to be stacked on the stacking table in a zigzag direction as reciprocating in a direction from a first side of the rotary shaft to a second side of the rotary shaft, wherein the stacking main body allows a first electrode plate to be stacked on a first separator in a first direction of the rotary shaft by the stacking jig, and allows a second electrode plate to be stacked on a second separator in a second direction of the rotary shaft by the stacking jig.

The lighting device emits light to allow the light to pass through a first stacked body in which the first separator, the first electrode plate, the second separator, and the second electrode plate are sequentially stacked, and the fixing jig is disposed on a first surface of the first stacked body and fixes the first stacked body, wherein the fixing jig has the open hole formed on the path of the light that has passed through the first stacked body.

The lighting device may include a lighting unit configured to emit light to allow the light to pass through the first stacked body and an angle adjustment unit configured to adjust an emission angle of the light emitted by the lighting unit.

The stacking table has a receiving groove formed therein to receive the lighting device, wherein the receiving groove is open so as to cover a radius of an acute angle range to which the light of the lighting device is emitted.

The stacking main body may include a guide shaft configured to be operated to allow the stacking main body to move vertically in a direction perpendicular to the first surface of the stacking main body.

The stacking main body stacks a plurality of first stacked bodies by a plurality of reciprocating movements in the direction from the first side of the rotary shaft to the second side of the rotary shaft, and the lighting device emits light for each first stacked body as the stacked body reciprocates from the first side to the second side by the rotary shaft, so that stacking inspection may be performed in real-time.

An inspection method for an apparatus for inspecting stacking of electrodes of a secondary battery may include: forming a first stacked body, which includes: stacking a first separator supplied from a separator supply device on a stacking table of a stacking main body; stacking a first electrode plate on the first separator by a stacking jig; stacking a second separator supplied from the separator supply device on the first electrode plate; and stacking a second electrode plate on the second separator by the stacking jig, and performing a first inspection process, which includes: coupling a fixing jig configured to fix the first stacked body in a stacking direction on the first stacked body; emitting, by a lighting device, light having a path passing through an open hole of the fixing jig and through the first stacked body; and capturing, by a capturing unit, an image of the light that has passed through the first stacked body, wherein the forming the first stacked body and the performing the first inspection process are repeated a plurality of times, and the first inspection process is performed on a previously formed first stacked body among a plurality of first stacked bodies.

The emitting, by the lighting device, the light having the path passing through the open hole of the fixing jig and through the first stacked body may further include adjusting an angle of the light emitted by the lighting device.

The forming the first stacked body may include: allowing the stacking main body to rotate in a first direction of a rotary shaft to stack the first separator supplied from the separator supply device on the stacking table of the stacking main body; stacking the first electrode plate on the first separator by the stacking jig; allowing the stacking main body to rotate in a second direction of the rotary shaft to stack the second separator on the first electrode plate; and stacking the second electrode plate on the second separator by the stacking jig.

In addition, the forming the first stacked body may further include: allowing a center of the rotary shaft to move toward an upper part and a lower part in the stacking direction of the first stacked body by a guide shaft as the stacking main body reciprocates in the first or second direction of the rotary shaft.

The features and advantages of the present disclosure will become more apparent from the following detailed description taken in conjunction with the accompanying drawings.

According to an embodiment of the present disclosure, the apparatus provides an effect of securing reliability and efficiency of an electrode stacking process of a secondary battery.

The apparatus provides effects of securing stacking reliability of a final electrode assembly and effectively decreasing defect rate through real-time stacking inspection of the electrode stacking process of a secondary battery.

The electrode stacking inspection is performed in real-time in the electrode stacking process of a secondary battery through a transmission method by a lighting device, and thus the apparatus provides an effect of increasing correction and accuracy in the stacking inspection.

In addition, a unit stacked body stacked in real-time in the electrode stacking process of a secondary battery is continuously performed in real-time in the electrode stacking process of a secondary battery through the transmission method, and thus the apparatus provides effectiveness and reliability of a transmission-type stacking inspection by the lighting device.

The obj ectives, specific advantages, and novel features of the invention will become more apparent from the following detailed description and preferred embodiments taken in conjunction with the accompanying drawings. In the present specification, in adding reference numbers to the components of each drawing, it should be noted that only the same components are given the same number as possible even though they are indicated on different drawings. In addition, terms, such as "one side", "other side", "first", "second", etc., are used to distinguish one component from another component, and the component is not limited by the terms. Hereinafter, in describing the present disclosure, detailed descriptions of related known technologies that may unnecessarily obscure the gist of the present disclosure will be omitted.

Hereinafter, an embodiment of the present disclosure will be described in detail with reference to the accompanying drawings, wherein like reference numerals indicate like members.

<FIG> is an operation schematic diagram of an apparatus for inspecting stacking of electrodes of a secondary battery according to an embodiment of the present disclosure, <FIG> is a schematic diagram of a direction in which a separator and an electrode plate are sequentially stacked on a stacking main body <NUM> according to <FIG>, <FIG> are views illustrating a process for inspecting a first stacked body <NUM> according to an embodiment of the present disclosure, and <FIG> is an enlarged view of an inspection portion of the first stacked body <NUM> of <FIG>.

An apparatus for inspecting stacking of electrodes of a secondary battery according to an embodiment of the present disclosure may include a separator supply device <NUM> configured to supply a separator, a stacking main body <NUM> having a stacking table <NUM> formed on one surface and configured to allow the separator to be stacked on the stacking table <NUM>, a stacking jig <NUM> configured to stack an electrode plate on the separator stacked on the stacking main body <NUM>, a fixing jig <NUM> configured to fix one surface of the electrode plate in a stacking direction, a lighting device <NUM> configured to emit light from one surface of the stacking table <NUM> to allow the light to pass sequentially through the separator and the electrode plate, and a capturing unit <NUM> configured to capture an image of the light that has passed through the separator and the electrode plate by the lighting device <NUM>, wherein the fixing jig <NUM> is disposed on a path of the light that is emitted from the lighting device <NUM> and passes through the separator and the electrode plate, and an open hole 22a is formed on an extension line of the path of the light that passes through the separator and the electrode plate.

As illustrated in <FIG>, in the apparatus for inspecting stacking of electrodes of a secondary battery according to an embodiment of the present disclosure, a separator is supplied from a separator supply device <NUM>, and the stacking main body <NUM> is reciprocally rotated in one side direction to the other side direction. As the stacking main body <NUM> reciprocates from one side to the other side, the separator is naturally stacked on the stacking table <NUM> of the stacking main body <NUM>, and as illustrated in <FIG>, electrode plates e1 and e2 are respectively stacked on a separator s in a zigzag direction on one side and the other side of the stacking main body <NUM> by the stacking jig <NUM>.

Although such a zigzag-type stacking method is illustrated as an example, the apparatus for inspecting stacking of electrodes of a secondary battery according to an embodiment of the present disclosure inspects stacking alignment or stacking state by light that passes through the stacked body from a lower surface of the stacked body to an upper exposure surface of the same by the lighting device <NUM> disposed on the stacking table <NUM> for each unit stacked body in real-time during a process of stacking the separator and the electrode plate, so that such a method may be also applied to various types of stacking processes.

Hereinafter, a zigzag-type stacking method of a separator and an electrode plate according to an embodiment of the present disclosure will be described as an example.

In particular, as illustrated in <FIG> and <FIG>, an electrode stacking device <NUM> for a secondary battery according to an embodiment of the present disclosure stacks the separator supplied from the separator supply device <NUM> and at the same time, sequentially stacks a first electrode plate <NUM> and a second electrode plate <NUM> on one side and the other side thereof through the stacking jig <NUM>, while reciprocally rotating in one side direction to the other side direction with respect to a rotary shaft <NUM>. As such operation is repetitively performed, the separator and the electrode plate are altemately stacked, so that an electrode assembly may be formed.

The separator supply device <NUM> provides the separator in one direction, as illustrated in <FIG>. In addition, as the stacking main body <NUM> reciprocates from one side to the other side with respect to the rotary shaft <NUM>, the separator supply device <NUM> may naturally stack the separator on the stacking table <NUM> of the stacking main body in a zigzag direction.

When a stacking height increases during a process of stacking the separator and the electrode plate on the stacking table <NUM> of the stacking main body <NUM>, a continuous electrode stacking process may be performed while a positive is naturally adjusted in a vertical direction by a guide shaft <NUM>.

The stacking jig <NUM> stacks the electrode plate on the stacking table <NUM>. When the separator is naturally stacked on the stacking table <NUM>, while the stacking main body <NUM> reciprocally rotates from one side to the other side, the stacking jig <NUM> stacks the electrode plate on the separator. Such a process of stacking the separator and repetitively stacking the electrode plate on the separator is repetitively performed, and thus a unit stacked body or an electrode assembly of a secondary battery may be manufactured.

In other words, the electrode stacking device <NUM> sequentially and respectively stacks positive and negative plates of different polarities of the first electrode plate <NUM> and the second electrode plate <NUM> on one side and the other side with the separator interposed therebetween, thereby forming an electrode assembly.

The electrode stacking device <NUM> may further include an image capturing device <NUM> disposed on the stacking table <NUM> to inspect electrode stacking alignment or electrode stacking state of the unit stacked body. The image capturing device <NUM> may include the lighting device <NUM>, the fixing jig <NUM>, and the capturing unit <NUM>, and each configuration will be described below.

When the unit stacked body is stacked on the stacking table <NUM>, the fixing jig <NUM> softly presses and fixes an upper surface of the unit stacked body so that the electrode stacking state may be inspected. When one unit stacked body is stacked during the electrode stacking process, the fixing jig <NUM> is fixed on the stacked body and the lighting device <NUM> emits light in a direction penetrating the stacked body, so that the capturing unit <NUM> captures an image, and thus it is possible to inspect the stacking alignment and the stacking state.

In an embodiment of the present disclosure, the lighting device <NUM> emits light toward each corner or at least two comers of the unit stacked body disposed on the stacking table <NUM>, so that the capturing unit <NUM> may capture an image thereof. However, it is not limited to the number of such locations or points.

On the other hand, in the fixing jig <NUM>, the open hole 22a may be formed on a path of light that is emitted from the lighting device <NUM> and passes through the unit stacked body, and the capturing unit <NUM> may capture an image representing the stacking alignment or stacking state of the stacked body through the light that passes through the stacked body and passes through the open hole 22a.

The open hole 22a is an area through which the light emitted from the lighting device <NUM> may pass and may be photographed, that is, an area for securing optimal fixation of the stacked body through the fixing jig <NUM> and, at the same time, efficiently securing a penetration position of the light for efficiently inspecting the stacking alignment and state. As illustrated in <FIG>, the fixing jig <NUM> is disposed (positioned) on one surface of the first stacked body <NUM>, and then open hole 22a may be formed on a path of light that has passed through the first stacked body <NUM>.

In an embodiment of the present disclosure, the first stacked body <NUM> as a unit stacked body is defined as a first separator <NUM>, a first electrode plate <NUM>, a second separator <NUM>, and a second electrode plate <NUM>, wherein the first electrode plate <NUM> and the second electrode plate <NUM> may be formed of a positive electrode plate or a negative electrode plate having opposite polarities.

When the unit stacked body is stacked, the lighting device <NUM> may fix the stacked body by the fixing jig <NUM> during the stacking process of the electrode stacking device <NUM> to check the electrode stacking alignment or state in real-time. As described above, the electrode stacking alignment may be efficiently inspected through a transmission method by the lighting device <NUM> for each unit stacked body sequentially stacked in units of the first stacked body <NUM> that is the unit stacked body.

The lighting device <NUM> may include a lighting unit 21a of a light source emitting light and an angle adjustment unit 21b for covering an adjustment range of an acute angle range of the light emitted from the lighting unit 21a.

That is, the angle adjustment unit 21b is for adjusting an emission angle of the light to emit the light that has passed through each unit stacked body during the electrode stacking process.

As illustrated in <FIG>, to emit light to allow the light to penetrate the stacked body in a direction from a lower surface of the stacked body to an upper surface of the stacked body, the lighting device <NUM> is installed in a receiving groove S formed on the stacking table <NUM> and the receiving groove S may form an open part of a range for covering the emission range of the acute angle range of the light by the angle adjustment unit 21b of the lighting unit 21a.

An installation position of the lighting device <NUM> is arranged at an edge of the stacking table <NUM>, that is, at a corresponding position of the edge of the stacked body, so that the electrode stacking alignment or state may be efficiently inspected, and it is also possible to change the installation position of the lighting device <NUM> depending on the state or stacking method of the stacked body.

<FIG> are views illustrating a process for inspecting stacking of the second stacked body according to an embodiment of the present disclosure, <FIG> is an enlarged view of an inspection portion of the second stacked body of <FIG>, and <FIG> is a plan view of an apparatus for inspecting stacking of electrodes of a secondary battery according to an embodiment of the present disclosure.

An inspection method for an apparatus for inspecting stacking of electrodes of a secondary battery according to an embodiment of the present disclosure may include forming a first stacked body, which includes: stacking a first separator <NUM> supplied from a separator supply device <NUM> on a stacking table <NUM> of a stacking main body <NUM>; stacking a first electrode plate <NUM> on the first separator <NUM> by a stacking jig <NUM>; stacking a second separator <NUM> supplied from the separator supply device <NUM> on the first electrode plate <NUM>; and stacking a second electrode plate <NUM> on the second separator <NUM> by the stacking jig <NUM>, and performing a first inspection process, which includes: coupling a fixing jig <NUM> configured to fix a first stacked body <NUM> in a stacking direction on the first stacked body <NUM>; emitting, by a lighting device <NUM>, light having a path passing through an open hole 22a of the fixing jig <NUM> through the first stacked body <NUM>; and capturing, by a capturing unit <NUM>, an image of the light that has passed through the first stacked body <NUM>, wherein the forming the first stacked body <NUM> and the performing the first inspection process are repeated a plurality of times, and the first inspection process is performed on a previously formed single first stacked body among a plurality of first stacked bodies <NUM>.

The inspection method for the apparatus for inspecting stacking of electrodes of a secondary battery according to an embodiment of the present disclosure inspects stacking alignment or state of electrodes for each unit stacked body at each point in time when the unit stacked body is formed during a process of sequentially stacking separators and electrode plates on the stacked body <NUM>.

Therefore, in the inspection method for the apparatus for inspecting stacking of electrodes of a secondary battery, the stacking method itself is illustrated as the zigzag method according to an embodiment of the present disclosure, but is not limited thereto. However, it is also premised on a technical configuration capable of inspecting the stacking alignment or state of the electrodes in real-time in units of a corresponding unit stacked body whenever the unit stacked body is stacked in a sequential stacking process of the separator and the electrode plate.

Hereinafter, a stacking method of a separator and an electrode plate in a zigzag direction according to an embodiment of the present disclosure will be described as an example.

In a first, as illustrated in <FIG>, the first separator <NUM> supplied from the separator supply device <NUM> is stacked on the stacking table <NUM> of the stacking main body <NUM>. That is, the stacking main body <NUM> rotates in one direction with respect to a rotary shaft <NUM> so that the first separator <NUM> is stacked from the separator supply device <NUM> on the stacking table <NUM>.

The separator supplied from the separator supply device <NUM> moves in the zigzag direction while the stacking main body <NUM> reciprocates from one side to the other side with respect to the rotary shaft <NUM>, and thus the separator and the electrode plate are sequentially and alternately stacked on the stack table <NUM>.

Next, the first electrode plate <NUM> is staked on the separator by the stacking jig <NUM>. That is, as illustrated in <FIG>, the first electrode plate <NUM> is stacked on the first separator <NUM> by the stacking jig <NUM>. The first electrode plate <NUM> may be a negative electrode plate or a positive electrode plate, and is formed of an electrode plate having a polarity opposite to that of the second electrode plate <NUM> to be stacked thereafter.

Next, the second separator <NUM> supplied from the separator supply device <NUM> is stacked on the first electrode plate <NUM>.

As illustrated in <FIG>, the second separator <NUM> is naturally stacked on the first electrode plate <NUM> while the stacking main body <NUM> rotates in the other direction with respect to the rotary shaft <NUM>. The second separator <NUM> is naturally stacked on the first electrode plate <NUM> by the separator supply device <NUM> in a central direction of the rotary shaft <NUM> while moving in the other direction with respect to the rotary shaft <NUM>.

Next, the second electrode plate <NUM> is stacked on the second separator <NUM> by the stacking jig <NUM> to form the first stacked body <NUM>. The first stacked body <NUM> is defined as a stacked body of the first separator <NUM>, the first electrode plate <NUM>, the second separator <NUM>, and the second electrode plate <NUM>, and in addition, it is also possible to change and adjust a necessary unit stacked body.

The second electrode plate <NUM> is stacked on the second separator <NUM> by the stacking jig <NUM>. As described above, the second electrode plate <NUM> may be an electrode plate having a polarity different from that of the first electrode plate <NUM>.

When the first stacked body <NUM> formed of the first separator <NUM>, the first electrode plate <NUM>, the second separator <NUM>, and the second electrode plate <NUM> is stacked during the electrode stacking process, as illustrated in <FIG>, the fixing jig <NUM> is coupled to one surface of the outermost second electrode plate <NUM> to fix the first stacked body <NUM>. That is, the fixing jig <NUM> for fixing the second electrode plate <NUM> to press the second electrode plate <NUM> is coupled to the second electrode plate <NUM>.

Here, pressurization does not mean that a substantial predetermined pressure is applied, but rather a coupling force of a conventional fixing jig <NUM> for fixing the first stacked body <NUM>. As illustrated in <FIG>, the fixing jig <NUM> is the same as the fixing jig <NUM> of an apparatus for inspecting stacking of electrodes of a secondary battery according to an embodiment of the present disclosure, and a detailed description thereof will be omitted.

Next, as illustrated in <FIG> and <FIG>, when the first stacked body <NUM> is fixed on the stacking table <NUM> by the fixing jig <NUM>, the lighting device <NUM> emits light of a path that sequentially passes through the first separator <NUM>, the first electrode plate <NUM>, the second separator <NUM>, and the second electrode plate <NUM> from an upper surface of the stacking table <NUM> and passes through the open hole 22a of the fixing jig <NUM>.

Next, the first inspection process is completed by allowing the capturing unit <NUM> to capture an image of the light that has passed through the first stacked body <NUM>. The first inspection process may be repeatedly performed in real-time during a stacking process of the electrode stacking device <NUM> as described above.

At this time, as illustrated in <FIG>, the stacking alignment or state of electrodes may be inspected by a transmission method in which light emitted from the lighting device <NUM> penetrates each unit stacked body in a direction from a lower part to an upper part. That is, the lighting unit 21a of the lighting device <NUM> installed on the receiving groove S of the stacking table <NUM> emits light at a predetermined angle to pass through the first stacked body <NUM> and the capturing unit <NUM> captures an image of the transmitted light, and thus the stacking state of the first stacked body <NUM> may be inspected by the transmission method.

After the first stacked body <NUM> is formed, as a process of performing the first inspection process is repeated, the stacking alignment or state of electrodes of each unit stacked body may be continuously inspected during an electrode stacking process of a secondary battery in real-time.

Specifically, a process repeated after the formation of the first stacked body <NUM> will be defined as the second stacked body <NUM> and will be described later.

First, as illustrated in <FIG>, while the stacking main body <NUM> rotates at a predetermined angle in one direction with respect to the rotary shaft <NUM>, a third separator <NUM> is stacked on the second electrode plate <NUM> from the separator supply device <NUM>.

Next, as illustrated in <FIG>, a third electrode plate <NUM> is stacked on the third separator <NUM> by the stacking jig <NUM>. Here, the third electrode plate <NUM> may be formed of an electrode plate having a polarity different from that of a fourth electrode plate <NUM> to be described later.

Next, as illustrated in <FIG>, a fourth separator <NUM> is stacked on the third electrode plate <NUM> while the stacking main body <NUM> rotates at a predetermined angle in the other direction with respect to the rotary shaft <NUM> and a fourth electrode plate <NUM> is stacked on the fourth separator <NUM> by the stacking jig <NUM>. In this way, the second stacked body <NUM> is stacked on the first stacked body <NUM>.

Next, to inspect the stacking state or alignment of electrodes of the second stacked body <NUM>, as illustrated in <FIG>, the fixing jig <NUM> for fixing and pressing the fourth electrode plate <NUM> is coupled to the fourth electrode plate <NUM>. Here, the fixing jig <NUM> is the same as the fixing jig <NUM> in the above-described first inspection process, and the overlapping detailed description will be omitted.

Next, as illustrated in <FIG> and <FIG>, the first inspection process is repeatedly performed, wherein the first inspection process may include allowing the lighting device <NUM> to emit light in a path passing through only the second stacked body <NUM> in which the third separator <NUM>, the third electrode plate <NUM>, the fourth separator <NUM>, and the fourth electrode plate <NUM> are sequentially formed to pass through the open hole 22a of the fixing jig <NUM>, and allowing the capturing unit <NUM> to capture an image of the light that has passed through the second stacked body <NUM>.

As illustrated in <FIG>, in the first inspection process, only the second stacked body <NUM> stacked in the subsequent processes is inspected except for the first stacked body <NUM> stacked in the previous first process. To emit the light that has passed through the second stacked body <NUM>, the lighting device <NUM> may include an angle adjustment unit 21b for adjusting a required light emission direction.

Moreover, the inspection method may include sequentially stacking the separator and the electrode plate while continuously repeating the first inspection process in this way and, at the same time, gradually and vertically lowering a center of the rotary shaft <NUM> in a lower side by a guide shaft <NUM> as a stacking height is increased. The guide shaft <NUM> may also selectively move up and down in a vertical direction as needed.

<FIG> is a photograph taken by an inspection method for an apparatus for inspecting stacking of electrodes of a secondary battery according to an embodiment of the present disclosure and <FIG> is a photograph taken by a general method for inspecting stacking of electrodes of a secondary battery.

Specifically, <FIG> is an image of an alignment state of a stacked body photographed by a transmission method through the inspection method for an apparatus for inspecting stacking of electrodes of a secondary battery according to an embodiment of the present disclosure, and <FIG>, as a comparative example, is an image of photographed by a stacked body inspection method as a general non-transmission method.

Claim 1:
An apparatus for inspecting stacking of electrodes of a secondary battery, the apparatus, comprising:
a separator supply device (<NUM>) configured to supply a separator (s);
a stacking main body (<NUM>) having a stacking table (<NUM>) formed on a first surface thereof and configured to allow the separator to be stacked on the stacking table;
a stacking jig (<NUM>) configured to stack an electrode plate (e1, e2) on the separator stacked on the stacking main body;
a fixing jig (<NUM>) configured to fix a first surface of the electrode plate in a stacking direction and comprising an open hole (22a);
a lighting device (<NUM>) configured to emit light from the first surface of the stacking table to allow the light to pass through the separator and the electrode plate; the fixing jig being disposed on a path of the light that is emitted from the lighting device and passes through the separator and the electrode plate such that the open hole of the fixing jig is positioned on an extension line of the path of the light that passes through the separator and the electrode plate so that the light passing through the separator and the electrode plate passes through the open hole of the fixing jig; and
a capturing unit (<NUM>) configured to capture an image of the light that has passed through the separator, the electrode plate, and the open hole of the fixing jig.