KR101058388B1 - Secondary Battery Inspection Device - Google Patents

Abstract

The present invention is a test device for measuring the thickness, voltage and resistance of the battery cell at the same time, the lower plate is mounted on the battery cell for inspection; An upper plate member vertically moving up and down with respect to the lower plate member so as to be in close contact with an upper surface of the battery cell mounted on the lower plate member; A pair of electrode measuring members contacting the electrode tabs of the battery cell while being fixed to the upper plate so as to measure the voltage and resistance of the battery cell; An impedance meter connected to the electrode measuring members; A thickness measuring member for measuring the distance to the upper surface of the upper plate in the state of being fixed to the lower plate to convert the thickness of the battery cell; A control unit for receiving, processing, and displaying detection information from the impedance measuring unit and the thickness measuring member; And a frame connected to both side surfaces of the upper plate in a state of being fixed to the lower plate so as to induce vertical movement of the upper plate. It provides a test device configured to include.

Description

Secondary Battery Inspection Device

1 is a schematic diagram of an inspection apparatus according to one embodiment of the invention, and FIG. 2 is a front perspective view of a portion of the inspection apparatus;

3 is a plan view of FIG. 2, and FIG. 4 is a partial side view;

5 is a side view of a thickness measuring member according to an embodiment of the present invention;

6 is a vertical sectional view of an electrode measuring member according to an embodiment of the present invention, and FIG. 7 is an exploded perspective view;

8 is a side perspective view of the apparatus of FIG. 2, and FIG. 9 is a partial perspective view of the apparatus in which the electrode connecting member is not mounted.

The present invention relates to an inspection apparatus for measuring the thickness, voltage and resistance of a battery cell at the same time, and more particularly, to measure a pair of electrodes in contact with the lower plate and the upper plate material, the electrode of the battery cell to position the battery cell A test apparatus comprising a member and a thickness measuring member for measuring the thickness of the battery cell. As technology development and demand for mobile devices increase, the demand for secondary batteries as a source of energy is rapidly increasing.

The secondary battery may be used in the form of a single battery cell, or in the form of a battery module in which a plurality of unit cells are electrically connected, depending on the type of external device in which the secondary battery is used. For example, a small device such as a mobile phone can operate for a predetermined time with the output and capacity of one battery cell, while a notebook computer, a portable DVD, a personal computer, an electric vehicle, and a hybrid electric Medium or large devices such as automobiles require the use of a battery module including a plurality of battery cells due to problems of output and capacity.

The battery module is manufactured by connecting a protection circuit or the like to a core pack in which a plurality of unit cells are arranged in series and / or in parallel. In the case of using a square or pouch type battery as a unit cell, the wide surfaces thereof may be stacked to face each other, and then the electrode terminals may be easily connected by connecting members such as bus bars. Therefore, in the case of manufacturing a three-dimensional battery module having a hexahedral structure, a square or pouch type battery is advantageous as a unit cell.

Conventionally, a nickel cadmium battery or a hydrogen ion battery is used as a secondary battery, but recently, a lithium ion battery and a lithium polymer battery having high energy density have been used. Such secondary batteries are increasing in demand due to the advantages described above.

On the other hand, one of the most important things in the production process of the secondary battery is quality control to check whether it provides the desired performance and safety. Here, the quality control is to determine whether the secondary battery has a good charge and discharge performance to produce a good product, while screening out defective products. This quality control is well made it is possible to produce a high quality secondary battery.

There are various variables in evaluating the characteristics of the secondary battery, for example, the thickness of the battery cell, the open circuit voltage and the internal resistance. The thickness of the battery cell varies due to the structural characteristics of the secondary battery, which is one of important management characteristics of the secondary battery because it greatly affects the workability in the assembly process. In addition, the open circuit voltage refers to the voltage of the battery in a state in which the load is not connected at all, i.e., the open circuit state, and the internal resistance represents how much the voltage decreases when a current flows in the battery. It is a very important measure for evaluating performance as a cell.

As a device for measuring the characteristics of such a secondary battery, a thickness measuring device using an indicator to measure the thickness of a battery cell, and an AC impedance measuring device for measuring a voltage or internal resistance have been used. However, the measuring method using these measuring devices has a disadvantage in that the measurement time is taken a lot since the measuring method is performed two or more times using two kinds of measuring devices for one measuring object. In addition, when the AC impedance measuring instrument is used separately from the thickness measuring instrument, there is an advantage of simultaneously measuring the voltage and the internal resistance, but there is a problem in that the result value is different due to the variable such as the position of the measuring point or the pressure difference pressing the electrode terminals. .

Accordingly, there is an urgent need for the development of a technology for a secondary battery inspection apparatus capable of simultaneously measuring thickness, voltage, and internal resistance, which are major characteristics of a battery cell, and reducing measurement error for each user.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-described problems of the prior art and the technical problems required from the past.

After repeated studies and various experiments, the inventors of the present application deform the structure of the secondary battery inspection apparatus to contact the electrode terminals of the battery cell in a state where the pair of electrode measuring members are fixed to the upper plate. When the thickness measuring member is configured to measure the distance to the upper surface of the upper plate while being fixed to the lower plate, the inspection time is greatly increased by simultaneously measuring the thickness, voltage, and internal resistance of the battery cell during the inspection of the battery cell. It has been confirmed that the advantages can be shortened and the measurement error per user can be reduced, and the present invention has been completed.

Therefore, the secondary battery inspection device according to the present invention, as a test device for measuring the thickness, voltage and resistance of the battery cell at the same time,

(a) a lower plate on which the battery cell is mounted for inspection;

(b) an upper plate member configured to vertically move with respect to the lower plate member so as to be in close contact with an upper surface of the battery cell mounted on the lower plate member;

(c) a pair of electrode measuring members contacting the electrode tabs of the battery cell while being fixed to the upper plate so as to measure the voltage and resistance of the battery cell;

(d) an impedance meter connected to the electrode measuring members;

(e) a thickness measuring member for measuring the distance to the upper surface of the upper plate in the state fixed to the lower plate to convert the thickness of the battery cell;

(f) a control unit for receiving, processing and displaying detection information from the impedance measuring unit and the thickness measuring member; And

(g) a frame connected to both sides of the upper plate in a state of being fixed to the lower plate so as to induce vertical movement of the upper plate;

It is configured to include.

That is, in the inspection apparatus according to the present invention, after the upper plate is moved downward in contact with the upper surface of the battery cell in a state where the battery cell is located on the upper surface of the lower plate, the thickness of the battery cell is measured using a thickness measuring member. At the same time, a pair of electrode measuring members can be simultaneously brought into contact with the positive and negative terminals of the battery cell to measure the voltage and resistance of the battery cell. Therefore, reliable inspection work can be performed within a short time without depending on the operator's experience. It can be done easily.

The battery cell is not particularly limited as long as it can be mounted on the lower plate in the inspection apparatus according to the present invention, and preferably may be a plate-shaped battery. In the present specification, the 'plate-like' means a rectangular parallelepiped shape having a thin thickness to width.

Such a plate-shaped battery is preferably a lithium secondary battery having high energy density, discharge voltage, and output stability, and the inspection apparatus according to the present invention includes an electrode assembly embedded in a laminate sheet battery case including a resin layer and a metal layer. It can be used more preferably for the inspection of the pouch type battery of the structure.

As described above, the upper plate and the lower plate may be made of a metal material having a high flatness in order to improve the accuracy of the measurement in the process of measuring the thickness of the battery cell. In this case, each of the electricity discharged from the battery cell In order to prevent conduction to the metal plates, an insulating member may be attached to the upper surface of the lower plate and / or the lower surface of the upper plate.

The insulating member is preferably made of an elastic material, so that the battery cell can be prevented from being broken by using the elastic force of the material itself from the pressure applied to the battery cell as the measurement target. This elastic material is not particularly limited, but preferably a rubber material can be used.

The position of the electrode terminal in the battery cell that can be applied to the inspection apparatus according to the present invention is not particularly limited, and in one preferred embodiment, the position of the positive electrode terminal and the negative electrode terminal is formed to face the opposite side ends of the electrode assembly Can be. In this case, the electrode measuring members are positioned at both sides with respect to the center of the upper plate so as to be in contact with the electrode terminals of the battery cell to measure voltage and resistance.

As described above, the upper plate vertically moving relative to the lower plate during the inspection operation is guided by the frame connected to both sides of the upper plate in a state of being fixed to the lower plate. Therefore, the upper plate material may be in close contact with the upper surface of the battery cell mounted on the lower plate material by the stable induction of the frame.

The electrode measuring member, which is vertically moved together with the upper plate in a state where it is fixed to the upper plate to measure the voltage and resistance of the battery cell, when the upper plate moves downward and closely adheres to the upper surface of the battery cell, Electrical contact is made by contacting the electrode terminals.

In one preferred embodiment, a through groove is formed in an upper plate member on which the electrode measuring member is located, and a connecting probe is provided below the electrode measuring member so as to elastically protrude downward through the through groove. It may be in contact with the electrode terminal of the battery cell through the through groove formed in the upper plate material.

In some cases, two or more through grooves are formed in the upper plate, so that the position of the electrode measuring member may be fixed by moving the position of the electrode measuring member according to the size and shape of the battery cell and the position of the electrode terminal.

In the process of moving the upper plate material provided with the electrode measuring member downward, the connection probe is elastic so as to prevent the connection probe protruding downward from the upper plate material from being destroyed while forcibly touching the electrode terminal of the battery cell. It protrudes downward into the structure.

For example, the electrode measuring member may include a connection pin of a long length having a connection pin for connecting a battery cell electrode terminal at a lower end thereof and a connection terminal at an upper end thereof. And a piston member fixed to the lower portion of the connection probe, a cylinder member into which the piston member is inserted in a state of being fixed to the upper plate member, and a cap coupled to the cylinder member in a state in which the connecting terminal of the electrode terminal protrudes. Can be. In such a structure, the connection probe causes the connecting pin to protrude downward through the through groove of the upper plate by the load of the piston member coupled to the lower portion thereof, and the connecting pin is connected to the battery cell electrode terminal by the downward movement of the upper plate. When contacted, the piston probe moves upward on the inner surface of the cylinder member, and the connection probe also moves upward, thereby preventing an excessive force from being applied to the connection pin thereof.

Preferably, the outer diameter of the piston member may be a structure smaller than the inner diameter of the cylinder member so that the piston member can move freely by its load.

Through-holes are drilled in the center of the cap so that the connecting terminals of the connecting probes can protrude, and screw threads are provided on the upper outer surface of the cylinder member and the inner surface of the corresponding cap, respectively, to facilitate the coupling of the cap and the cylinder member. Is formed, and a connection probe (connection probe with a piston member coupled to the lower part) is mounted inside the hollow of the cylinder member, and the cap is rotated by rotating the cap while the upper connection terminal of the connection probe is inserted into the through hole. Can be combined.

In one preferred example, a compression spring having one end fixed to the piston member may be further mounted between the piston member and the cap to realize a more resilient downwardly projecting structure of the connection probe. That is, the compression spring mounted between the piston member and the cap provides a resilient down force to the piston member, and a resilient down force is also provided to the connecting probe coupled to the piston member. Therefore, when the connecting pin of the connection probe is brought into contact with the battery cell by the downward movement of the upper plate, it is possible to prevent the force from being applied to the connecting pin, and the battery cell is pressed while the compression spring is pressed when the connecting probe moves upward. It ensures a stable contact state of the connecting pin to the electrode terminal.

The method of connecting the upper plate and the frame is not particularly limited as long as it is capable of vertically moving the upper plate. However, the upper plate may be made of an LM rail / block structure.

For example, a linear motion (LM) rail is formed in the frame in the longitudinal direction, and LM blocks are formed on both sides of the upper plate, so that the LM block moves up and down along the LM rail. The upper plate of the can also be precisely moved up and down.

Preferably, the variable shaft further includes a variable shaft so as to easily perform the vertical movement of the upper plate material without directly manipulating the upper plate material which is in contact with the upper surface of the battery cell. Consists of a structure that is coupled to the frame to enable vertical movement up and down while maintaining the.

In one preferred example, the rear end of the variable shaft is rotatably connected to a support fixed to the lower plate, the front of the variable shaft may be a structure in which a working handle is formed. Therefore, when the operator grasps the handle of the variable shaft and moves up and down at a predetermined angle in accordance with a desired position, the variable shaft rotatably connected to the support is vertically moved up and down along the frame.

In the above structure, the upper plate material is connected to the shaft to enable vertical movement, so that the top plate is moved up and down while maintaining the horizontal state regardless of the rotation angle of the variable shaft. In some cases, both sides of the upper plate may not be directly connected to the frame, but the variable shaft may be connected to the frame member. In this case, the upper plate should have a structure capable of vertically moving in a horizontal state.

On the other hand, when the thickness of the battery cell is not constant, it is necessary to make the thickness of the battery cell uniform by increasing the weight of the top plate and applying an appropriate pressure to the battery cell. Therefore, on the upper surface of the upper plate member, an indentation portion in which a pressing member for selectively applying a predetermined additional pressure may be selectively mounted may be formed at a central portion of the upper plate member.

In this case, two or more grooves are formed in the indentation portion at a position spaced apart from each other, and protrusions corresponding to the grooves are formed in the indentation portion for mounting the pressing member to the indentation portion. The member can be mounted in place on the top plate.

The method of moving the upper plate up and down with respect to the lower plate may be a manual or automatic method, for example, it is also possible to configure the movement of the upper plate up and down automatically when measuring a plurality of battery cells.

The thickness measuring member for measuring the thickness of the battery cell measures the thickness of the battery cell indirectly by the position change of the upper plate. That is, the thickness measuring member is fixed to the lower plate regardless of the position change of the upper plate, and measures the distance change with the upper plate to convert the thickness of the battery cell based on the predetermined distance. The distance measurement with respect to the top plate in the thickness measuring member can be achieved by, for example, irradiation of light, irradiation of radio waves, physical contact pins, or the like.

In one preferred embodiment, the thickness measuring member is mounted to the end of the fixed shaft and the fixed shaft which is bent in the upper direction of the upper plate in a state where one end is fixed to the lower plate, at a predetermined distance from the upper surface of the upper plate The distance measuring probe, and an indicator including a calculation unit for converting the thickness of the battery cell based on the information detected from the probe.

As a result, as described above, the voltage and internal resistance of the battery cell detected by the electrode measuring member may be checked by an impedance measuring instrument, and the thickness of the battery cell may be confirmed by the thickness measuring member. Therefore, the characteristic information (thickness, voltage, and internal resistance) of the battery cell can be checked manually and compared with a good product specification standard, or automatically the quantity / defect of the battery cell can be determined.

The control unit may receive the information detected by the impedance measuring device and the thickness measuring member, and compare with the previously stored good specification information, determine whether the difference of the information is less than a predetermined value to determine and display the good or bad.

In some cases, the controller can be configured as a personal computer to automatically determine the quantity / defect of the battery cell, and manage the history of the battery cell measurement data.

The present invention also provides a method for inspecting a battery cell using the inspection device made of the specific structure.

That is, the battery cell inspection method according to the present invention,

(a) placing the battery cell on the bottom plate;

(b) fixing the thickness measuring member and the electrode measuring member to a predetermined position by moving the upper plate material downward and closely contacting the upper surface of the battery cell;

(c) transmitting detection information of the thickness, voltage, and resistance of the battery cell measured from the thickness measuring member and the electrode measuring member to the controller; And

(d) comparing the measured information detected by the control unit with previously stored good specification information and determining a good quality battery cell when the difference of the information is less than a predetermined value;

It may be configured to include.

Therefore, the battery cell inspection method can measure the thickness, voltage and internal resistance of the battery cell at the same time using the thickness measuring member and the electrode measuring member, thereby reducing the time required for measurement by more than half, conventional electrode Compared to the method of measuring the voltage and internal resistance by contacting the electrode measuring pin to the terminal, it is possible to reduce the measurement error according to the deviation of the measurement method for each user.

In the step (b), in order to equalize the thickness of the battery cell, the pressure member may be combined with the upper surface of the upper plate to increase the pressure applied to the battery cell.

In step (d), the measurement data for the battery cells may be historically managed using a personal computer as a control unit, which may be usefully used as information for improving quality.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings, but the present invention is not limited by the scope of the present invention.

1 is a schematic diagram of an inspection apparatus according to an embodiment of the present invention, and FIG. 2 is a front view of a portion of the inspection apparatus as a partial perspective view.

Referring to these drawings, the secondary battery inspection apparatus 900 includes a lower plate 100 on which the battery cell 10 is mounted, an upper plate 200 moving up and down relative to the lower plate 100, and a battery cell 10. Fixed to be connected to the rear of the pair of electrode measuring members 300, the lower plate 100 is mounted on the upper plate 200 spaced apart by the distance (d) between the negative electrode terminal 12 and the positive electrode terminal 14 And a thickness measuring member 500 mounted on the shaft 510 and spaced apart from the upper surface of the upper plate 200 by a predetermined distance.

Elastic insulating members 110 and 210 are attached to an upper surface of the lower plate 100 and a lower surface of the upper plate 200, respectively. Therefore, when the upper plate 200 is lowered to be in close contact with the upper surface of the battery cell 10, it is possible to prevent the breakage while applying excessive force to the battery cell 10 by the elastic insulating members (110, 210). Can be.

The upper surface of the upper plate 200 is formed with an indentation to be selectively mounted on the pressing member (not shown) for applying a predetermined additional pressure, if necessary, the groove 240 is formed at its end It is. Therefore, when the thickness of the battery cell 10 is not constant, by increasing the weight of the top plate 200 to apply an appropriate pressure to the battery cell 10 can make the thickness of the battery cell 10 uniform.

In addition, both side surfaces of the upper plate 200 is coupled to the guide portion 220, the guide portion 220 is connected to the frame 700 in the LM block / rail structure, the upper plate 200 is kept horizontal Induces vertical movement in one state. More detailed structure of the LM block / rail structure will be described later in FIGS. 3 and 9.

Up and down movement with respect to the top plate 200 is achieved by manipulating the variable shaft 230 located in its upper direction. A more detailed coupling relationship between the configuration of the variable shaft 230 and the upper plate 200 will be described later with reference to FIGS. 4 and 5.

The electrode measuring member 300 includes a connection probe 310, a cylinder member 340 in which the connection probe 310 is inserted and mounted and fixed to the upper plate 200, and a cap 320 coupled to the cylinder member 340. Consists of The connection probe 310 protrudes elastically by a predetermined size through the through hole drilled in the upper plate 200. A more detailed structure of the electrode measuring member 300 will be described later with reference to FIGS. 6 and 7.

The thickness measuring member 500 is mounted on the fixed shaft 510 connected to the rear surface of the lower plate 100, and the top plate 200 of the probe 520 is located below the thickness measuring member 500. After measuring the distance according to the vertical movement, the thickness of the battery cell 10 is also converted and displayed on the indicator 530 digitally (number). The thickness information of the battery cell 10 is directly transmitted to the personal computer 600, and the voltage and internal resistance of the battery cell 10 detected by the electrode measuring member 300 are transferred to the personal computer (via the impedance measuring unit 400). 600).

The personal computer 600 compares the data detected by the impedance measuring device 400 and the thickness measuring member 500 with the product specification reference information previously input into the computer to determine the quantity / defect of the battery cell 10. For the history management of the battery cell 10, data such as measurement date, product number, thickness, voltage, and internal resistance of the battery cell are stored in a database (not shown separately) of the personal computer 600.

3 shows a top view of FIG. 2 and a partial side view of FIG. 4.

Referring to these drawings, the variable shaft 230 is rotatably connected to the support 232, the rear end of which is fixed to the lower plate 100, the working handle 234 is formed in the front center, It is connected to the upper plate 200 by the rotation connecting pin 236.

The guide part 220 installed on the side of the upper plate 200 has an LM block 222 connected to the LM rail 710 of the frame 700 to move up and down, so that the upper plate 200 maintains a horizontal state. While inducing to move up and down.

Therefore, when the operator grasps the handle 234 of the variable shaft 230 and moves up and down at a predetermined angle according to a desired position, the variable shaft 230 rotatably connected to the support 232 is vertically moved up and down. The upper plate 200 connected by the rotation connecting pin 236 moves up and down while maintaining a horizontal state regardless of the rotation angle of the variable shaft 230.

Figure 5 is a side view of the thickness measuring member according to an embodiment of the present invention.

Referring to FIG. 5, the thickness measuring member 500 for measuring the thickness of the battery cell may include a fixed shaft that is bent in an upper direction of the upper plate 200 in a state where one end thereof is fixed to the lower plate 100. 510, a battery cell based on the distance measuring probe 520 mounted on the end of the fixed shaft 510 at a predetermined distance from the upper surface of the upper plate 200, and the information detected from the probe 520. It consists of the indicator 530 containing the calculating part which converts the thickness of (not shown).

Therefore, the thickness measuring member 500 is fixed to the lower plate 100 regardless of the position change of the upper plate 200, the battery cell on the basis of the predetermined distance by measuring the distance change with the upper plate 200 The thickness of is converted.

6 is a vertical cross-sectional view of the electrode measuring member according to an embodiment of the present invention, Figure 7 is an exploded perspective view.

Referring to these drawings, the electrode measuring member 300 includes a fan-shaped connection probe having a connection pin 312 formed at a lower end thereof for connecting a battery cell electrode terminal and a connection terminal 314 formed at an upper end thereof. 310, a piston member 350 coupled to a lower portion of the connection probe 310, a cylinder member 340 into which the piston member 350 is inserted while being fixed to the upper plate member 200, and a connection terminal of the electrode terminal The cap 320 is coupled to the cylinder member 340 in the protruding state, and the compression spring 330 is mounted between the piston member 350 and the cap 350.

The connection pin 312 protrudes downward by a predetermined size through the through groove 260 drilled in the upper plate 200.

The piston member 350 having an outer diameter smaller than the inner diameter of the cylinder member 340 induces vertical movement of the connection probe 310, and is coupled to the connection probe 310 through a fastening hole 342 formed at a side surface thereof.

The through hole 322 is drilled in the center of the cap 320 so that the connecting terminal 314 of the connecting probe 310 can protrude, and the coupling between the cap 320 and the cylinder member 340 can be facilitated. Thread lines 324 are formed on the upper outer surface of the cylinder member 340 and the inner surface of the cap 320 corresponding thereto. Therefore, the connection probe 310 is mounted inside the hollow of the cylinder member 340, and the cap 320 is rotated while the upper connection terminal 314 of the connection probe 310 is inserted into the through hole 322. It may be coupled to the cylinder member 340.

The compression spring 330 is mounted between the piston member 350 and the cap 320 with one end fixed to the piston member 350 and the other end fixed to the cap 320.

Due to the structure as described above, the connection probe 310 is elastically protruded downward through the through groove 260 of the upper plate 200 by the lower connection pin 312 by the elasticity of the compression spring 330. . Therefore, when the connecting pin 312 is in contact with the battery cell electrode terminal (not shown) by the downward movement of the upper plate 200, if an excessive force is applied to the connecting pin 312, it is moved upward and destroyed it Can be prevented. In addition, when the connection probe 310 moves upward, the compression spring 330 is pressed to ensure a stable contact state of the connection pin 312 with respect to the battery cell electrode terminal.

FIG. 8 shows a side perspective view of the device of FIG. 2, and FIG. 9 shows a partial perspective view without the electrode connecting member mounted.

Referring to these drawings, a battery cell (not shown) is mounted on a lower plate 100 having an insulating member 110 attached to an upper surface thereof, and an upper plate 200 having an insulating member 210 attached to a lower surface thereof. Moving downward) completes the preparation for measuring the voltage, internal resistance and thickness of the battery cell. Therefore, the desired inspection work can be completed by a simple operation.

Vertical vertical movement of the upper plate 200, when the handle 234 of the variable shaft 230 is rotatably connected by the support 232 fixed to the lower plate 100 at a predetermined angle , Can be achieved easily.

The upper plate 200 to which the cylinder member on which the electrode connecting member (not shown) is to be mounted is fixed is provided with guide parts 220 coupled to both sides thereof in the LM block / rail structure. The upper plate 200 and the variable shaft 230 are connected to the rotatable shaft 270. Therefore, even if the variable shaft 230 moves up and down while rotating a predetermined angle, the upper plate member 200 is capable of precise vertical up and down movement.

Those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims.

As described above, the inspection apparatus according to the present invention can shorten the measurement time by simultaneously measuring the thickness, voltage, and internal resistance of the battery cell while having a simple structure, and furthermore, the electrode measuring pin is placed at the same position of the battery cell electrode terminal. Since the same pressure can be applied, there is an effect that can greatly reduce the error that may occur according to the measurer.

Claims (19)

An inspection device for measuring the thickness, voltage and resistance of the battery cell at the same time, (a) a lower plate on which the battery cell is mounted for inspection; (b) an upper plate member configured to vertically move with respect to the lower plate member so as to be in close contact with an upper surface of the battery cell mounted on the lower plate member; (c) a pair of electrode measuring members contacting the electrode tabs of the battery cell while being fixed to the upper plate so as to measure the voltage and resistance of the battery cell; (d) an impedance meter connected to the electrode measuring members; (e) a thickness measuring member for measuring the distance to the upper surface of the upper plate in the state fixed to the lower plate to convert the thickness of the battery cell; (f) a control unit for receiving, processing and displaying detection information from the impedance measuring unit and the thickness measuring member; And (g) a frame connected to both sides of the upper plate in a state of being fixed to the lower plate so as to induce vertical movement of the upper plate; The thickness measuring member includes a fixed shaft that is bent in an upper direction of the upper plate in a state where one end is fixed to the lower plate, and an end of the fixed shaft at a predetermined distance from the upper surface of the upper plate. And an indicator including a distance measuring probe attached to the calculator, and an operation unit for converting the thickness of the battery cell based on the information detected from the probe. The test apparatus according to claim 1, wherein the battery cell is a plate-shaped battery. The test apparatus according to claim 2, wherein the plate-shaped battery is a pouch-type battery having a structure in which an electrode assembly is incorporated in a laminate sheet battery case including a resin layer and a metal layer. The inspection apparatus according to claim 1, wherein an insulating member is attached to (i) the upper surface of the lower plate, or (ii) the lower surface of the upper plate, or (iii) the upper surface of the lower plate and the lower surface of the upper plate. . The inspection apparatus according to claim 4, wherein the insulation member is made of an elastic material. The test apparatus according to claim 1, wherein the positions of the positive electrode terminal and the negative electrode terminal in the battery cell are formed opposite to both side end portions of the electrode assembly. According to claim 1, wherein the through plate is formed in the upper plate member on which the electrode measuring member is positioned, the lower portion of the electrode measuring member is provided with a connection probe which is elastically projected downward through the through groove. Inspection device. The method of claim 7, wherein the electrode measuring member is connected to the lower length of the connection probe, a long length connection probe having a connection pin for connecting the battery cell electrode terminal at the bottom and the connection terminal is formed at the upper end And a fixed piston member, a cylinder member into which the piston member is inserted in a state of being fixed to the upper plate member, and a cap coupled to the cylinder member in a state where the connecting terminal of the electrode terminal protrudes. 9. The inspection apparatus according to claim 8, wherein an outer diameter of the piston member is smaller than an inner diameter of the cylinder member. 9. The upper portion of the cap member according to claim 8, wherein a through hole is formed in the center of the cap so that the connecting terminal of the connecting probe can protrude, and the cap and the cylinder member can be easily coupled to each other. The caps are formed on the inner surface of the cap, so that the connecting probe (the connecting probe with the piston member coupled to the lower part) is mounted inside the hollow of the cylinder member, and the cap is connected with the upper connecting terminal of the connecting probe inserted into the through hole. Rotating the coupling to the cylinder member, characterized in that. The inspection apparatus according to claim 8, further comprising a compression spring having one end fixed to the piston member between the piston member and the cap. The inspection apparatus according to claim 1, wherein the connection portion between the upper plate and the frame has an LM rail / block structure. According to claim 1, Up and down vertical in a state in which the top plate is maintained in a horizontal state to easily perform the vertical movement of the top plate without directly manipulating the top plate which is in contact with the top surface of the battery cell The inspection apparatus further comprises a variable shaft connected to the upper plate in the movable condition. The inspection apparatus according to claim 13, wherein the rear end of the variable shaft is rotatably connected to a support fixed to the lower plate, and a working handle is formed at the front center of the variable shaft. The inspection apparatus according to claim 1, wherein an indentation portion in which a pressing member for applying a predetermined additional pressure may be selectively mounted on an upper surface of the upper plate is formed at a central portion of the upper plate. The method of claim 15, wherein the indentation is formed with two or more grooves in the spaced apart position, the pressing member is formed with a projection corresponding to the groove, the pressing member is mounted in the correct position of the upper plate material Inspection device, characterized in that. delete The apparatus of claim 1, wherein the controller receives the information detected by the impedance measuring instrument and the thickness measuring member, and compares the stored product specification information with each other to determine whether the difference of the information is less than or equal to a predetermined value. And a personal computer for displaying the display. A method for inspecting a battery cell using the inspection device according to claim 1, (a) placing the battery cell on the bottom plate; (b) fixing the thickness measuring member and the electrode measuring member to a predetermined position by moving the upper plate material downward and closely contacting the upper surface of the battery cell; (c) transmitting detection information of the thickness, voltage, and resistance of the battery cell measured from the thickness measuring member and the electrode measuring member to the controller; And (d) comparing the measured information detected by the control unit with previously stored good specification information and determining a good quality battery cell when the difference of the information is less than a predetermined value; Inspection method comprising a.

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