KR20210085975A - Secondary battery pouch sealing part thickness measuring assembly and pouch sealing part thickness measuring method - Google Patents

Abstract

An objective of the present invention is to provide an apparatus for measuring the thickness of a sealing part of a secondary battery pouch and a method for measuring the thickness of a sealing part of a pouch. The method for measuring the thickness of a sealing part of a secondary battery pouch, capable of resolving the occurrence of a measurement error, comprises: a lower probe (30) to be brought into contact with a lower surface of a sealing part (2S) of a secondary battery pouch; and an upper probe (20) to be brought into contact with an upper surface of the sealing part (2S) of the pouch. The lower probe (30) advances and comes into contact with the lower surface of the sealing part (2S) to measure the thickness deviation between a zero set point (ZP) for measuring the thickness of the sealing part (2S) and the lower surface of the sealing part (2S). The upper probe (20) advances and comes into contact with the upper surface of the sealing part (2S) to measure the thickness deviation between the zero set point (ZP) for measuring the thickness of the sealing part (2S) and the upper surface of the sealing part (2S).

Description

A device for measuring the thickness of the sealing part of the pouch for secondary batteries and a method for measuring the thickness of the sealing part of the pouch {Secondary battery pouch sealing part thickness measuring assembly and pouch sealing part thickness measuring method}

The present invention relates to an apparatus for measuring the thickness of the sealing part of a pouch for secondary batteries and a method for measuring the thickness of the sealing part of the pouch, and more particularly, to the thickness of the sealing part of the pouch for secondary batteries that can precisely measure the thickness of the sealing part of the pouch for secondary batteries. It relates to a measuring device and a method for measuring the thickness of a sealing part of a pouch.

In general, a pouch-type secondary battery refers to a battery having a structure in which an electrode assembly is embedded in a pouch formed by bonding an aluminum laminate sheet. The pouch-type secondary battery includes an electrode tab provided for electrical connection between the pouch and the pouch. An electrolyte is injected into the pouch in an open state, and a sealing portion is formed to seal the pouch while the electrode tab extends from the electrode inside the pouch to protrude to the outside of the pouch.

At this time, if the thickness of the sealing part in the secondary battery pouch is not accurately measured, it is difficult to properly determine whether the pouch is defective or the like, so it is important to accurately measure the thickness of the sealing part of the secondary battery pouch. If the thickness of the pouch is not measured properly and it is not possible to determine whether there is a defect, for example, when gas is found inside the pouch, the secondary battery may burst. Therefore, accurate thickness measurement of the sealing part of the secondary anterior pouch is difficult. very important. There are not many cases where gas is generated inside the pouch and fills up while using the secondary battery, but if you use a pouch with poor thickness for which the thickness of the sealing part of the pouch is not properly measured, problems such as bursting of the secondary battery may occur if gas fills inside the pouch. Therefore, it is very important to measure the thickness of the sealing part of the secondary battery pouch.

The thickness of the sealing part of the secondary battery pouch is measured at various points of the sealing part. Measure the thickness at least at 3~5 positions of the sealing part of the pouch. At this time, the thickness measurement accuracy should be secured to at least 1㎛.

However, in the prior art, in a state where the measurement reference surface was set to zero by contacting the measurement probe to the measurement reference surface, the sealing part of the pouch was placed on the measurement reference surface, and the measuring probe was brought into contact with the pouch sealing surface to measure the thickness. However, there is a problem in that a measurement error occurs due to deformation of the pouch sealing surface.

Even if the adhesion unit is used, the thickness of the sealing portion cannot be measured properly because the probe is inaccurate due to the rigidity of the sealing portion.

Also, in the prior art, a problem of repeatability occurs when the reference plane moves up and down. If the reference plane for measuring the thickness of the sealing part repeats up and down movement, a lot of errors occur, and accordingly, a lot of errors occur in measuring the thickness of the sealing part.

The thickness of the sealing part of the pouch must be accurately measured in micrometers. Since the sealing part of the pouch is melted and adhered, it has rigidity, and even if the sealing part with such rigidity is pressed by a measuring probe, the thickness must be accurately measured. .

However, due to the rigidity of the sealing portion of the pouch, a gap occurs between the measuring probe and the sealing portion of the pouch. In the past, thickness measurement error due to such a gap cannot be overcome, so that it is not easy to accurately measure the thickness of the sealing portion.

Korean Patent Laid-Open Patent No. 10-2012-0126932 (registered on November 21, 2012) Korean Patent Publication No. 10-2016-0133041 (registered on November 22, 2016)

SUMMARY OF THE INVENTION The present invention is to solve the problems described above, and an object of the present invention is to provide an apparatus for measuring the thickness of the sealing portion of a pouch and a method for measuring the thickness of the sealing portion of the pouch, which can precisely measure the thickness of the sealing portion of a secondary battery pouch would like to An object of the present invention is to provide an apparatus for measuring the thickness of the sealing part of a pouch and a method for measuring the thickness of the sealing part of the pouch, which can accurately measure even the modified sealing surface of the pouch.

According to the present invention for solving the above problems, a lower probe in contact with the lower surface of the sealing part of the pouch for secondary batteries; There is provided an apparatus for measuring the thickness of the sealing portion of the pouch for secondary batteries, characterized in that it includes; an upper probe in contact with the upper surface of the sealing portion of the pouch.

The lower probe advances to the lower surface of the sealing part to measure the thickness deviation between the zero set point for measuring the thickness of the sealing part and the lower surface of the sealing part, and the upper probe contacts the zero set point for measuring the thickness of the sealing part and the upper surface of the sealing unit advance to the upper surface of the sealing unit to measure a thickness deviation between the upper surface and the upper surface of the sealing unit.

The upper end of the lower probe is constituted by a lower contact part, and the lower end of the upper probe is constituted by an upper contact part, so that the lower contact part and the upper contact part are in contact with the lower surface and the upper surface of the sealing part of the pouch, respectively.

The upper contact portion of the upper probe and the lower contact portion of the lower probe include an upper contact operation portion and a lower contact operation portion for contacting the upper and lower surfaces of the sealing portion of the pouch, respectively, wherein the lower contact portion is higher than the upper contact portion. It is characterized in that the sealing part of the pouch is operated to contact with a relatively greater force.

and a measurement reference jig disposed between the lower probe and the upper probe and having a predetermined thickness.

The upper end of the lower probe and the lower end of the upper probe are brought into contact with the measurement reference jig to set a reference plane for measuring the thickness of the sealing part of the pouch, the measurement reference jig is removed, and the upper end of the lower probe and the lower end of the upper probe are respectively the pouch It is characterized in that it is configured to measure the thickness of the sealing portion of the pouch while in contact with the lower surface and the upper surface of the sealing portion.

The pouch is characterized in that it is configured to measure the thickness of the sealing portion by contacting the upper end of the lower probe and the lower end of the upper probe to the lower surface and the upper surface of the sealing portion of the pouch, respectively, while being mounted on the stand.

According to the present invention, the steps of setting a zero set point for measuring the thickness of the sealing portion of the pouch for secondary batteries; The upper end of the lower probe and the upper end of the upper probe are brought into contact with the lower surface and upper surface of the sealing part of the pouch, respectively, to obtain the lower probe measurement value and the upper probe measurement value based on the zero set point, so that the sealing part of the pouch is There is provided a method for measuring the thickness of the sealing part of the pouch for secondary batteries, characterized in that it comprises; measuring the thickness.

The upper end of the lower probe and the upper end of the upper probe are brought into contact to set a zero set point for measuring the thickness of the sealing part of the pouch for secondary batteries, and the zero setting point is set in a state where the upper end of the lower probe is in contact with the lower surface of the sealing part. It is characterized in that it is configured to obtain the measured value of the lower probe based on , and obtain the measured value of the upper probe based on the zero set point while the lower end of the upper probe is in contact with the upper surface of the sealing part.

The thickness of the sealing part of the pouch is measured by adding the measured value of the lower probe and the measured value of the upper probe.

A measurement reference jig having a predetermined thickness is disposed between the lower probe and the upper probe to determine a zero set point for measuring the thickness of the sealing part of the pouch, and the lower probe measurement value and the upper probe measurement based on the zero set point It is characterized in that it is configured to measure the thickness of the sealing part of the pouch by acquiring a value.

The measurement reference jig is removed between the lower probe and the upper end and the lower end of the upper probe, and the lower probe measurement value is obtained based on the zero set point while the upper end of the lower probe is in contact with the lower surface of the sealing part, and It is characterized in that it is configured to obtain the upper probe measurement value based on the zero set point while the lower end of the upper probe is in contact with the upper surface of the sealing part.

A lower zero set point and an upper zero set point are determined based on the thickness of the reference measuring jig, and at the lower zero set point, the upper end of the lower probe rises to contact the sealing portion of the pouch, and at the upper zero set point The thickness of the sealing portion of the pouch is measured by subtracting a distance from which the upper end of the upper probe comes into contact with the sealing portion of the pouch from the thickness of the reference measurement jig.

The device for measuring the thickness of the sealing portion of the pouch for a secondary battery and the method for measuring the thickness of the sealing portion of the pouch of the present invention solve the problem of measurement error due to deformation of the sealing portion of the pouch, and even if the adhesion unit is not used, the upper portion due to the rigidity of the sealing portion Since it prevents the case of inaccurate adhesion between the probe and the lower probe, the thickness of the sealing part can be measured properly, and there is an effect of preventing the occurrence of repeatability problems due to the vertical movement of the thickness measurement reference plane.

1 is a plan view showing a thickness measurement point when measuring the thickness of a sealing part of a pouch for a secondary battery according to the present invention;
2 is a view showing a process of setting a zero set point for measuring the thickness of the sealing part of the conventional pouch for secondary batteries;
3 is a view showing a process of measuring the thickness of a conventional secondary battery pouch sealing part;
4 is a view showing a case in which a thickness measurement error occurs when measuring the thickness of a deformed sealing part of a conventional secondary battery pouch;
5 is a view showing a case in which a repeat accuracy problem occurs due to vertical movement of a conventional measurement reference plane; FIG.
6 is a front view showing the main part of the device for measuring the thickness of the sealing part of the pouch for secondary batteries according to the present invention;
7 is a view showing a process of setting a zero set point for measuring the thickness of the sealing portion of the pouch for secondary batteries by the device for measuring the thickness of the sealing portion of the pouch for secondary batteries according to the present invention;
8 is a view showing a process of measuring the thickness of the sealing part of the pouch by the sealing part thickness measuring device of the secondary battery pouch according to the present invention;
9 is a view showing a state in which accurate thickness measurement of the deformed sealing portion of the pouch is possible by the device for measuring the thickness of the sealing portion of the pouch for secondary batteries according to the present invention;
10 is a view showing a process of setting a zero set point for measuring the thickness of the sealing portion of the pouch for secondary batteries by the measurement reference jig, which is a main part of the device for measuring the thickness of the sealing portion of the pouch for secondary batteries according to the present invention;
11 is a view showing a state in which accurate thickness measurement of the deformed sealing part of the pouch is possible by an upper probe and a lower probe in a state where a zero set point, which is a measurement reference point, is set by the measurement reference jig shown in FIG.
12 is a view schematically showing a state in which deformation occurs in the sealing portion of the pouch while the sealing portion of the pouch is pressed by an upper pressing piece and a lower pressing piece;
13 is a view schematically showing the process of measuring the thickness of the sealing part without error by spreading the deformed sealing part of the pouch to a flat surface by the lower probe, which is a main part of another embodiment of the present invention;
14 is a view schematically showing the process of measuring the thickness of the sealing part without error by spreading the deformed sealing part of the pouch to a flat surface by the upper probe, which is a main part of another embodiment of the present invention;

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The objects, features and advantages of the present invention will be more readily understood by referring to the accompanying drawings and the following detailed description. In the drawings, the same reference numbers are used for the same parts. In addition, in describing the present invention, if it is determined that a detailed description of a related known configuration or function may obscure the gist of the present invention, the detailed description thereof will be omitted.

In addition, in describing the components of the present invention, terms such as first, second, A, B, (a), (b), etc. may be used. These terms are only for distinguishing the component from other components, and the essence, order, or order of the component is not limited by the term. When it is described that a component is “connected”, “coupled” or “connected” to another component, the component may be directly connected or connected to the other component, but another component is between each component. It will be understood that may also be "connected", "coupled" or "connected".

Referring to the drawings, the device for measuring the thickness of the sealing portion of the pouch for secondary batteries of the present invention includes a lower probe 30 that is in contact with the lower surface of the sealing portion 2S of the pouch for secondary batteries, and the upper surface of the sealing portion 2S of the pouch. and an upper probe 20 that becomes

The lower end of the upper probe 20 is constituted by the upper contact part 22 , and the upper end of the lower probe 30 is constituted by the lower contact part 32 . The upper contact portion 22 and the lower contact portion 32 have a hemispherical shape. The upper probe 20 and the lower probe 30 are configured to be raised and lowered by the upper contact operating unit and the lower contact operating unit.

The upper probe mounting panel and the lower probe mounting panel are slidably coupled to the main frame in the vertical direction, and the upper probe 20 and the lower probe 30 may be mounted to the upper probe mounting panel and the lower probe mounting panel, respectively. .

An upper contact operation part and a lower contact operation part are mounted on the main frame, the upper probe mounting panel and the upper probe 20 are raised and lowered by the upper contact operation part, and the lower probe mounting panel and the lower probe 30 are lowered It may be configured to be raised and lowered by a contact actuating unit. In this case, the upper contact operation unit may be configured as an upper lifting operation cylinder in which a cylinder rod is connected to the upper probe mounting panel, and the upper contact operation unit may include an upper lifting operation cylinder in which the cylinder rod is connected to the upper probe mounting panel.

The upper frame and the lower frame are arranged on the same axis in the vertical direction, and the upper probe 20 and the lower probe 30 are sealed to the periphery of the secondary battery pouch by the upper contact operation unit and the lower contact operation unit. The upper and lower surfaces of the portion 2S may be in contact with each other. The upper contact portion 22 of the upper probe 20 and the lower contact portion 32 of the lower probe 30 are in contact with the upper and lower surfaces of the sealing portion 2S of the pouch, respectively. The upper contact operation part and the lower contact operation part are the upper contact part 22 of the upper probe 20 and the lower contact part 32 of the lower probe 30 in addition to the upper lifting operation cylinder and the lower lifting operation cylinder, respectively, of the pouch. Both the upper and lower probes 20 and 30, which are operated so as to be in contact with the upper and lower surfaces of the sealing portion 2S, can be employed as long as they are killable means for elevating and lowering the upper and lower probes.

On the other hand, a pair of left and right upper pressing pieces 24 and lower pressing pieces 34 disposed on both sides of the upper probe 20 and the lower probe 30 hold the sealing portion 2S of the pouch from the upper and lower surfaces, respectively. The upper contact portion 22 of the upper probe 20 and the lower contact portion 32 of the lower probe 30 may be in contact with the upper and lower surfaces of the sealing portion 2S of the pouch, respectively, in a pressing state. have.

The pouch is configured such that the thickness of the sealing part 2S mounted by the upper probe 20 and the lower probe 30 can be measured while being mounted on a stand provided in the main frame. The stand is arranged next to the area where the upper probe 20 and the lower probe 30 are lifted, put the pouch on the stand, and the sealing part of the pouch that enters the lift area of the upper probe 20 and the lower probe 30 (2S) is configured to measure the thickness.

The lower probe 30 advances to the lower surface of the sealing portion 2S to measure the thickness deviation between the zero set point ZP for measuring the thickness of the sealing portion 2S and the lower surface of the sealing portion 2S. . Since the lower probe 30 is under the sealing portion 2S of the pouch, the lower probe 30 is raised so that the lower contact portion 32 of the lower probe 30 is in contact with the lower surface of the sealing portion 2S of the pouch.

The upper probe 20 advances to the upper surface of the sealing portion 2S to measure the thickness deviation between the zero set point ZP for measuring the thickness of the sealing portion 2S and the upper surface of the sealing portion 2S. . The upper probe 20 is above the sealing portion 2S of the pouch, so that the upper probe 20 is lowered so that the upper contact portion 22 of the upper probe 20 is in contact with the upper surface of the sealing portion 2S of the pouch.

On the other hand, the method for measuring the thickness of the sealing part of the pouch for secondary batteries according to the present invention comprises the steps of setting a zero set point (ZP) for measuring the thickness of the sealing part (2S) of the pouch, the upper end of the lower probe 30 and the upper probe The upper end of (20) is brought into contact with the lower and upper surfaces of the sealing portion 2S of the pouch, respectively, and the lower probe measurement value and the upper probe measurement value are obtained based on the zero setting point (ZP) of the sealing portion 2S of the pouch. measuring the thickness.

The principle of measuring the thickness of the sealing portion 2S of the pouch according to the present invention will be described as follows.

In the present invention, two upper and lower probes are used. The upper probe 20 and the lower probe 30 are used.

A zero set point ZP is determined using the upper probe 20 and the lower probe 30 . The upper contact portion 22 of the upper probe 20 and the lower contact portion 32 of the lower probe 30 are brought into contact from the top and bottom to determine the zero setting point ZP. This is the meter zero setting. This step is the step of determining the zero set point (ZP).

When the zero set point ZP is determined, the sealing part 2S of the pouch is disposed between the upper probe 20 and the lower probe 30, and the upper contact part 22 of the upper probe 20 and the lower probe ( 30), the lower contact portions 32 are brought into contact with the upper and lower surfaces of the sealing portion 2S of the pouch, respectively.

Then, the upper probe measurement value and the lower probe measurement value can be obtained. The distance between the upper contact portion 22 of the upper probe 20 at the zero set point ZP is the upper probe measurement, and the lower contact portion 32 of the lower probe 30 at the zero set point ZP. The distance between them is the lower probe measurement.

The thickness of the sealing part 2S of the pouch may be measured by adding the measured value of the upper probe and the measured value of the lower probe obtained in this way. That is, the thickness of the sealing part of the pouch = the upper probe measurement + the lower probe measurement value. This step is a step of measuring the thickness of the sealing part 2S of the pouch.

As such, if the thickness of the sealing part 2S of the pouch is obtained using the upper probe 20 and the lower probe 30, it is possible to accurately measure the thickness even on a deformed sealing surface.

Accordingly, the present invention solves a problem in which a measurement error occurs due to deformation of the sealing portion 2S of the pouch. In the present invention, even if the adhesion unit is not used, since the adhesion between the upper probe 20 and the lower probe 30 does not become inaccurate due to the rigidity of the sealing part 2S, the thickness measurement of the sealing part 2S can be performed properly. can

In addition, the present invention prevents the occurrence of a repeatability problem due to the vertical movement of the reference plane. Since the thickness measurement reference plane of the sealing part 2S does not repeat the vertical movement, there is no case where a thickness measurement error occurs much, and thus, the case where an error occurs in the thickness measurement of the sealing part 2S is prevented as compared to the conventional one.

As described above, it is necessary to accurately measure the thickness of the sealing portion 2S of the pouch in micrometers, and since the sealing portion 2S of the pouch is melted and adhered, there is rigidity, and the sealing portion 2S having such rigidity ) is pressed by the measuring probe, but the thickness must be measured accurately.

However, in the present invention, the occurrence of a gap between the upper probe 20 and the lower probe 30 and the sealing portion 2S of the pouch is prevented due to the rigidity of the sealing portion 2S of the pouch, and the occurrence of such a gap Since the thickness measurement error caused by the thickness measurement error can be overcome, there is an effect that the thickness of the sealing part 2S is accurately measured.

Meanwhile, the present invention further includes a measurement reference jig 42 to measure the thickness of the sealing part 2S of the pouch by using the measurement reference jig 42 . A measurement reference jig 42 is disposed between the lower probe 30 and the upper probe 20 , and the thickness between the upper and lower surfaces of the measurement reference jig 42 is determined. The thickness of the measurement reference jig 42 is configured to be thicker than the thickness of the sealing part 2S of the pouch.

A measurement reference jig 42 having a predetermined thickness is disposed between the lower probe 30 and the upper probe 20 to determine a zero set point (ZP) for measuring the thickness of the sealing part 2S of the pouch, and By acquiring the measured value of the lower probe and the measured value of the upper probe based on the zero set point ZP, the thickness of the sealing part 2S of the pouch may be measured.

After the measurement reference jig 42 is removed between the lower probe 30 and the upper end and the lower end of the upper probe 20, the upper end of the lower probe 30 is in contact with the lower surface of the sealing part 2S. to obtain the lower probe measurement value based on the zero set point (ZP), and measure the upper probe based on the zero set point (ZP) while the lower end of the upper probe 20 is in contact with the upper surface of the sealing part 2S get the value

The principle of measuring the thickness of the sealing part 2S of the pouch using the measurement reference jig 42 will be described in more detail as follows.

In a state in which the upper probe 20 and the lower probe 30 are vertically spaced apart, the measurement reference jig 42 is disposed between the upper probe 20 and the lower probe 30 .

In this state, the upper probe 20 is lowered so that the upper contact portion 22 of the upper probe 20 is in contact with the upper surface of the sealing portion 2S of the pouch, and the lower contact portion 32 is raised by raising the lower probe 30. Make contact with the lower surface of the sealing part (2S) of the pouch.

Then, the point at which the upper contact part 22 is in contact with the upper surface of the sealing part 2S of the pouch becomes the upper zero setting point ZP, and the lower contact part 32 is the sealing part 2S of the pouch. The point in contact with the lower surface becomes the lower zero set point (ZP).

When the upper zero set point (ZP) and the lower zero set point (ZP) are determined, the measurement reference jig 42 is removed, and the sealing part 2S of the pouch is attached to the upper zero set point (ZP) and the lower zero set point (ZP). ) in the area between

Next, when the upper probe 20 is lowered and the lower probe 30 is raised, the distance the upper probe 20 further descends from the upper zero set point ZP becomes the upper probe measurement value, and at the lower zero set point ZP The distance at which the lower probe 30 is further raised becomes the lower probe measurement value. That is, the distance at which the upper contact portion 22 of the upper probe 20 descends further from the upper zero set point ZP is the upper probe measurement value, and the lower contact portion 32 of the lower probe 30 is the lower zero The higher distance from the set point (ZP) is the lower probe measurement.

Since the measurement reference jig 42 is thicker than the sealing portion 2S of the pouch, the distance the upper contact portion 22 of the upper probe 20 descends further from the upper zero setting point ZP is minus ( -) is obtained as the upper probe measurement value, and the distance at which the lower contact part 32 of the lower probe 30 rises further from the lower zero set point ZP is obtained as a negative (-) lower probe measurement value.

When the upper probe measurement value and the lower probe measurement value are obtained in this way, the thickness of the sealing part 2S of the pouch can be measured by subtracting the upper probe measurement value and the lower probe measurement value from the thickness of the measurement reference jig 42 . . For example, if the thickness of the measurement reference jig 42 is 500 µm, the upper probe measurement value is 200 µm, and the lower probe measurement value is 100 µm, the thickness of the sealing part of the pouch is 500 µm - 200 µm - 100 µm = 200 μm.

Therefore, in the present invention, the thickness of the sealing portion 2S of the pouch can be accurately measured without error by using the measurement reference jig 42 .

Even when the thickness of the sealing part 2S of the pouch is measured using the measurement reference jig 42, the sealing part 2S of the pouch is measured using only the two upper probes 20 and the lower probe 30 described above. Since it is the same as the effect in the case where the measurement reference jig 42 is used, a redundant description of the effect in the case of using the measurement reference jig 42 will be omitted.

On the other hand, in the present invention, a pair of left and right upper pressing pieces 24 and lower pressing pieces 34 disposed on both sides of the upper probe 20 and the lower probe 30 connect the sealing portion 2S of the pouch to the upper surface and the upper surface, respectively. The upper contact part 22 of the upper probe 20 and the lower contact part 32 of the lower probe 30 are in contact with the upper and lower surfaces of the sealing part 2S of the pouch, respectively, in a state of being pressed from the bottom surface of the pouch To measure the thickness of the sealing part 2S of the pouch, the sealing part 2S of the pouch is a plastic in which pouch sheets for forming a pouch are melted and joined, so that the upper pressing piece 24 and the lower pressing piece 34) If the sealing portion 2S of the pouch is pressed and held, the portion that is not pressed in the sealing portion 2S is pushed out around the upper pressing piece 24 and the lower pressing piece 34 if you look closely at the sealing portion 2S. ) may be deformed. As indicated by the arrow in FIG. 12 , the portion that is not pressed in the sealing portion 2S is pushed out around the upper pressing piece 24 and the lower pressing piece 34 , and deformation of the sealing portion 2S may occur. In particular, the contact portion between the upper contact portion 22 and the lower contact portion 32 of the upper probe portion and the lower probe 30 may be wrinkled due to the pushed-in portion (uneven deformation). When viewed on the basis of a very precise thickness, such as 1 μm, the contact portion between the upper contact portion 22 and the lower contact portion 32 of the upper probe portion and the lower probe 30 is wrinkled due to the pushed in deformation. will be.

However, in the present invention, an error in measuring the thickness of the sealing portion 2S occurs by compensating for deformation occurring in the portion where the upper contact portion 22 and the lower contact portion 32 of the upper probe portion and the lower probe 30 are in contact. In order to prevent this from happening, the lower probe 30 is configured to apply a greater pressing force on the lower surface of the sealing portion 2S of the pouch than the pressing force of the upper probe 20 on the upper surface of the sealing portion 2S of the pouch. It may be configured to press the upper probe 20 and the lower probe 30 by the force of the upper spring and the lower spring, respectively. By making the elastic force of the lower spring greater than the elastic force of the upper spring, the lower probe than the upper probe 20 (30) presses the sealing part (2S) of the pouch with greater force. Meanwhile, the lower probe 30 may be configured to press the sealing portion 2S of the pouch with greater force than the upper probe 20 by the upper contact operation unit and the lower contact operation unit.

As shown in FIG. 13 , the lower probe 30 comes up earlier than the upper probe 20 and presses the sealing part 2S of the pouch from the bottom with a greater force than the upper probe 20, and the upper probe 20 is If you come down and press the sealing part 2S, the sealing part 2S comes up as if it is slightly curved upward by the greater force that the lower probe 30 presses from below, and the sealing part 2S. As the wrinkled part of the wrinkled part is straightened, the sealing part 2S is compensated to the original normal thickness.

At this time, the lower probe 30 flatly presses and flattens the wrinkled height of the sealing part 2S of the pouch. It is configured to press the sealing portion (2S) of the pouch. That is, the lower probe 30 presses the wrinkled part in the sealing part 2S of the pouch and presses the sealing part 2S further in the state where the wrinkled part is unfolded. It is to press the sealing part (2S).

In the sealing portion 2S of the pouch, the upper pressing piece 24 and the lower pressing piece 34 are pushed in by the pressing force, and the wrinkled portion of the lower probe 30 is larger than the upper probe 20 . Since the thickness of the sealing part 2S is measured in the state that it is pressed by force and spread out with a flat surface (flat surface), a thickness measurement error caused by the sealing part 2S of the pouch is prevented from being wrinkled, so the sealing part of the pouch The thickness of (2S) can be measured correctly without further errors.

In addition, the lower probe 30 prevents deformation such that the sealing part 2S of the pouch itself is reduced more than the original normal thickness due to the force that the lower probe 30 presses more than the upper probe 20 . ), the radius of curvature of the lower contact portion 32 is larger than the radius of curvature of the upper contact portion 22 of the upper probe 20 . For example, if the radius of curvature of the lower contact portion 32 of the lower probe 30 is 3 mm, the radius of curvature of the upper contact portion 22 of the upper probe 20 is 1 mm.

In this way, since the lower contact portion 32 of the lower probe 30 is pressed to a relatively flatter portion compared to the upper contact portion 22 of the upper probe 20, the lower probe 30 The thickness measurement error of the sealing part 2S due to pressing with a greater force than the upper probe 20 is also compensated.

Therefore, since the thickness deformation of the sealing part 2S due to pressing the lower probe 30 with a relatively greater force compared to the upper probe 20 is more reliably prevented, the thickness of the sealing part 2S of the pouch is measured. It is possible to completely prevent errors from occurring.

On the other hand, as shown in FIG. 14 , the upper probe 20 comes down before the lower probe 30 and presses the sealing part 2S of the pouch from above with a greater force than the lower probe 20, and the lower probe 30 ) comes up and presses the sealing part (2S), the sealing part (2S) comes down as if it is slightly curved downwardly by the greater force that the upper probe 30 presses from above, and the sealing part ( As the wrinkled portion of the 2S is straightened, the sealing portion 2S is compensated to the original normal thickness. In FIG. 14 , the radius of curvature of the upper contact portion 22 of the upper probe 20 is greater than the radius of curvature of the lower contact portion 32 of the lower probe 30 .

At this time, the upper probe 20 flatly presses and flattens the wrinkled height of the sealing part 2S of the pouch. It is configured to press the sealing portion (2S) of the pouch. That is, the upper probe 30 presses the wrinkled part in the sealing part 2S of the pouch and presses the sealing part 2S further in the state where the wrinkled part is unfolded. It is to press the sealing part (2S).

In the sealing portion 2S of the pouch, the upper pressing piece 24 and the lower pressing piece 34 are pushed in by the pressing force, and the wrinkled portion of the upper probe 20 is larger than the lower probe 30 . Since the thickness of the sealing part 2S is measured in the state that it is pressed by force and spread out with a flat surface (flat surface), a thickness measurement error caused by the sealing part 2S of the pouch is prevented from being wrinkled, so the sealing part of the pouch The thickness of (2S) can be measured correctly without further errors.

14 shows that the lower probe 30 is raised in a state in which the upper probe 20 first presses the sealing portion 2S from above and spreads the sealing portion 2S into a wrinkled portion, and the lower contact portion 32 is connected to the sealing portion ( 2S) and the radius of curvature of the upper contact portion 22 of the upper probe 20 is larger than the radius of curvature of the lower contact portion 32 of the lower probe 30 is shown.

In addition, the upper probe 20 prevents deformation such that the sealing part 2S of the pouch itself is reduced more than the original normal thickness due to the force that the upper probe 20 presses more than the lower probe 30 . ) is configured such that the radius of curvature of the upper contact portion 22 is larger than the radius of curvature of the lower contact portion 32 of the lower probe 30 . For example, if the radius of curvature of the upper contact portion 22 of the upper probe 20 is 3 mm, the radius of curvature of the lower contact portion 32 of the lower probe 20 is 1 mm.

In this way, since the upper contact portion 22 of the upper probe 20 is pressed to a relatively flatter portion compared to the lower contact portion 32 of the lower probe 30, the upper probe 20 The thickness measurement error of the sealing part 2S due to pressing with a greater force than the lower probe 30 is also compensated.

Therefore, since the thickness deformation of the sealing part 2S due to pressing the upper probe 20 with a relatively greater force than the lower probe 30 is more reliably prevented, the thickness of the sealing part 2S of the pouch is measured. It is possible to completely prevent errors from occurring.

In the above, specific embodiments of the present invention have been described above. However, the spirit and scope of the present invention is not limited to these specific embodiments, and it is common knowledge in the technical field to which the present invention pertains that various modifications and variations are possible within the scope that does not change the gist of the present invention. Anyone who has it will understand.

Accordingly, since the embodiments described above are provided to fully inform those of ordinary skill in the art to which the present invention belongs the scope of the invention, it should be understood that they are exemplary in all respects and not limiting, The invention is only defined by the scope of the claims.

20. Upper Probe 22. Upper Contact
24. Upper pressing piece 30. Lower probe
32. Lower contact part 34. Lower pressing piece
42. Dimension jig

Claims (10)

a lower probe 30 in contact with the lower surface of the sealing part 2S of the secondary battery pouch;
An apparatus for measuring the thickness of the sealing part of the pouch for secondary batteries, characterized in that it comprises; an upper probe (20) in contact with the upper surface of the sealing part (2S) of the pouch.
According to claim 1,
The lower probe 30 advances to the lower surface of the sealing part 2S to measure the thickness deviation between the zero set point ZP for measuring the thickness of the sealing part 2S and the lower surface of the sealing part 2S. and the upper probe 20 to measure the thickness deviation between the zero set point ZP for measuring the thickness of the sealing part 2S and the upper surface of the sealing part 2S. The sealing part 2S. A device for measuring the thickness of the sealing part of the pouch for secondary batteries, characterized in that it advances to the upper surface of the .
3. The method of claim 2,
The upper end of the lower probe 30 is constituted by a lower contact part 32 , and the lower end of the upper probe 20 is constituted by an upper contact part 22 , and the lower contact part 32 and the upper contact part are constituted by the upper contact part 22 . (22) is an apparatus for measuring the thickness of the sealing portion of the pouch for secondary batteries, characterized in that each contacted the lower surface and the upper surface of the sealing portion (2S) of the pouch.
According to claim 1,
The sealing part thickness measuring device of the secondary battery pouch, characterized in that it further comprises a; is disposed between the lower probe (30) and the upper probe (20), the measurement reference jig (42) having a predetermined thickness.
5. The method of claim 4,
The upper end of the lower probe 30 and the lower end of the upper probe 20 are in contact with the measurement reference jig 42 to set the thickness measurement reference plane of the sealing part 2S of the pouch, and the measurement reference jig 42 to measure the thickness of the sealing portion 2S of the pouch with the upper end of the lower probe 30 and the lower end of the upper probe 20 in contact with the lower and upper surfaces of the sealing portion 2S of the pouch, respectively. A device for measuring the thickness of the sealing part of a pouch for secondary batteries, characterized in that it is configured.
According to claim 1,
When the pouch is mounted on a stand, the upper end of the lower probe 30 and the lower end of the upper probe 20 are in contact with the lower and upper surfaces of the sealing portion 2S of the pouch, respectively, so that the thickness of the sealing portion 2S is A device for measuring the thickness of the sealing part of the pouch for secondary batteries, characterized in that it is configured to measure.
setting a zero setting point (ZP) for measuring the thickness of the sealing part (2S) of the pouch for secondary batteries;
The upper end of the lower probe 30 and the upper end of the upper probe 20 are in contact with the lower and upper surfaces of the sealing part 2S of the pouch, respectively, and the measured value of the lower probe and the Measuring the thickness of the sealing portion (2S) of the pouch by acquiring the upper probe measurement value; A method for measuring the thickness of the sealing portion of the pouch for secondary batteries, characterized in that it comprises a.
8. The method of claim 7,
The upper end of the lower probe 30 and the upper end of the upper probe 20 are brought into contact to set a zero set point (ZP) for measuring the thickness of the sealing portion 2S of the pouch for secondary batteries, and the lower probe 30 is In a state where the upper end is in contact with the lower surface of the sealing unit 2S, the lower probe measurement value is obtained based on the zero setting point ZP, and the lower end of the upper probe 20 is on the upper surface of the sealing unit 2S. A method for measuring the thickness of a sealing part of a pouch for secondary batteries, characterized in that it is configured to obtain the upper probe measurement value based on the zero set point (ZP) in a contact state.
8. The method of claim 7,
A measurement reference jig 42 having a predetermined thickness is disposed between the lower probe 30 and the upper probe 20 to determine a zero set point (ZP) for measuring the thickness of the sealing part 2S of the pouch, Method for measuring the thickness of the sealing part of the pouch for secondary batteries, characterized in that it is configured to measure the thickness of the sealing part (2S) of the pouch by acquiring the lower probe measurement value and the upper probe measurement value based on the zero set point (ZP) .
10. The method of claim 9,
The measurement reference jig 42 is removed between the lower probe 30 and the upper end and the lower end of the upper probe 20, and the upper end of the lower probe 30 is in contact with the lower surface of the sealing part 2S. to obtain the lower probe measurement value based on the zero set point (ZP), and with the lower end of the upper probe 20 in contact with the upper surface of the sealing part 2S, the zero set point (ZP) as a reference A method of measuring the thickness of the sealing part of the pouch for secondary batteries, characterized in that it is configured to obtain the upper probe measurement value.

Images