Charging / discharging jig for measuring impedance of battery cell

Abstract

A charging / discharging jig for measuring impedance of a battery cell according to the present invention includes a fixed stand provided with a first charging / discharging bus bar, a work stand slidably coupled to the fixed stand and provided with a second charging / discharging bus bar, a movable stand slidably coupled to a bottom side of the fixed stand, and an electric wire fixed to one side of the fixed stand and the other side of the work stand corresponding to the other side of the fixed stand to extend along the bottom sides of the fixed stand and the work stand. The present invention is characterized in that, when the work stand slides with respect to the fixed stand, a change in tension of the electric wire is absorbed by interlocked movement of the movable stand in the same direction as the work stand.

Description

TECHNICAL FIELD

[0001] The present application relates to a charging and discharging jig for measuring impedance of a battery cell.

[0002] More particularly, the present application relates to a charging and discharging jig for measuring impedance, which is capable of consistently maintaining the length and tension of an electric wire for impedance measurement regardless of a change in the length of the charging and discharging jig.

[0003] This application claims the benefit of priority based on Korean Patent Application No. 10-2021-0110464, filed on August 20, 2021, and the entire contents disclosed in the document of the Korean Patent Application are incorporated as part of the present specification. BACKGROUND

[0004] Recently, a secondary battery capable of being charged and discharged has been widely used as an energy source for wireless mobile devices. In addition, as an energy source for electric vehicles and hybrid electric vehicles, which are proposed as a measure to solve air pollution of conventional gasoline and diesel vehicles using fossil fuels, a secondary battery is gaining attention. Therefore, due to the advantages of a secondary battery, the types of applications using a secondary battery are diversifying, and it is expected that a secondary battery will be applied to more fields and products in the future.

[0005] According to the composition of electrodes and electrolytes, a secondary battery can be classified into a lithium ion battery, a lithium ion polymer battery, and a lithium polymer battery, and among these batteries, the use amount of a lithium ion polymer battery is increasing, the possibility of electrolyte leakage of a lithium ion polymer battery is low, and it is easy to manufacture. Generally, according to the shape of a battery case, a secondary battery is classified into a cylindrical battery in which an electrode assembly is embedded in a cylindrical metal can, a prismatic battery in which an electrode assembly is embedded in a prismatic metal can, or a pouch-type battery in which an electrode assembly is embedded in a pouch-type case of an aluminum laminate. The electrode assembly embedded in the battery case is formed in a structure of a positive electrode, a negative electrode, and a separator interposed between the positive electrode and the negative electrode, and is a power generation element capable of being charged and discharged. The electrode assembly is classified into a jelly-roll type electrode assembly in which a separator is interposed between a positive electrode and a negative electrode, which are long sheets coated with an active material, and is wound, or a stacked type electrode assembly in which a plurality of positive electrodes and negative electrodes each having a predetermined size are sequentially stacked with a separator interposed therebetween.

[0006] In order to check the safety and performance of the secondary battery, various tests can be performed on the secondary battery. Among the various tests, a method of evaluating the safety and performance of the battery by measuring the impedance of the battery cell is considered to be reliable. In this way, the impedance of the battery cell is measured to be able to evaluate major factors such as lifespan, capacity, and state of charge.

[0007] The measurement result of the impedance of the battery cell varies according to the change in the length of the wire or the movement of the wire. In the case of a cylindrical battery having a small length and a large impedance value, the influence of the wire is relatively small, whereas in the case of a medium to large pouch-type battery having a large length and a small impedance value, the deviation of the impedance value measured according to the length or movement of the wire is large. The impedance of the battery cell can be measured by installing the battery cell in a charging and discharging jig that can be displaced in the length direction of the battery cell.

[0008] Specifically, the impedance is measured such that the lead wires of the battery cell having different polarities are installed at a charging / discharging bus bar installed on both sides of a charging and discharging jig, and the wire is connected to the charging / discharging bus bar. In this case, the charging and discharging jig can be displaced in the length direction of the battery cell according to the type and size of the battery to measure the impedance for various battery cells. However, when the charging and discharging jig is displaced, the wire installed in the charging / discharging bus bar is also displaced, thereby causing the tension of the wire to vary. When the tension of the wire varies, the length of the wire located in the impedance measurement path also varies, so that the impedance cannot be accurately measured. That is, when the impedance is measured, since the external magnetic field varies according to the change in the length and tension of the wire, the noise increases, so that the impedance value varies every time the measurement is performed, thereby causing a problem that the impedance cannot be measured with high accuracy. This problem is more serious in the case of a medium to large pouch-type battery having a large length and a small battery cell impedance value.

[0009] Accordingly, there is a need to develop an apparatus that can measure the impedance by maintaining the consistent length and tension of the battery cell regardless of the displacement of the charging and discharging jig.

[0010] Related Art Documents

[0011] Patent Documents

[0012] Korean Patent Laid-Open Application No. 10-2014-0134518 SUMMARY

[0013] TECHNICAL PROBLEM

[0014] An object of the present application is to provide a charging and discharging jig for measuring impedance, which is capable of maintaining a uniform length and tension of an electric wire for impedance measurement regardless of a change in the length of the charging and discharging jig.

[0015] Technical Solution

[0016] In one embodiment of the present application, there is provided a charging and discharging jig for measuring impedance of a battery cell, the charging and discharging jig including: a fixed pedestal provided with a first charging / discharging bus bar on an upper surface of one side; a movable pedestal slidably coupled to the fixed pedestal and provided with a second charging / discharging bus bar on an upper surface of the other side opposite to the one side of the fixed pedestal; a moving pedestal slidably coupled to a bottom surface of the fixed pedestal; and an electric wire fixed to the one side of the fixed pedestal and the other side of the movable pedestal and configured to extend along bottom surfaces of the fixed pedestal and the movable pedestal, wherein a first rod is installed to protrude from a bottom side of the fixed pedestal closer to the movable pedestal than the moving pedestal, and the electric wire extending from the one side of the fixed pedestal forms a first loop having a trajectory turning on the first rod and returning to the fixed pedestal, a second rod is installed to protrude from the moving pedestal, and the electric wire extending from the first loop forms a second loop having a trajectory turning on the second rod and going to the movable pedestal, and when the movable pedestal slides to move relative to the fixed pedestal, the moving pedestal is interlocked to the movable pedestal and moves in the same direction as the movable pedestal, so that lengths of the first loop and the second loop are adjusted to absorb a change in tension of the electric wire.

[0017] The charging and discharging jig can include an elastic member having one end installed on the one side of the fixed pedestal and the other end coupled to the moving pedestal, and the elastic member applies a force pulling the moving pedestal toward the one side of the fixed pedestal.

[0018] The electric wires can include a signal wire and a sensing wire, the signal wire and the sensing wire extending in parallel along both sides of the fixed seat and the movable seat in a width direction, the first rod can be configured as a first rod pair including a first signal wire rod and a first sensing wire rod, the first signal wire rod and the first sensing wire rod being installed on both sides of the fixed seat in the width direction, the movable seat can be installed between the first signal wire rod and the first sensing wire rod, and the second rod can be configured as a second rod pair including a second signal wire rod and a second sensing wire rod, the second signal wire rod and the second sensing wire rod being installed on both sides of the movable seat in the width direction.

[0019] The movable seat can be slidably coupled to an upper surface of the fixed seat.

[0020] A guide slit can be formed on both sides of one of the fixed seat and the movable seat in a width direction, and a sliding support member inserted into the guide slit can be installed in the other of the fixed seat and the movable seat.

[0021] The sliding support member can include a body part inserted into the guide slit and threadedly coupled to the fixed seat or the movable seat, and a head part having a width greater than a width of the guide slit.

[0022] A guide rail can be installed on a bottom surface of the fixed seat, and the movable seat can be slidably coupled to the guide rail.

[0023] An extension part can be formed in an end portion of the first rod and the second rod.

[0024] An impedance measurement plate can be coupled to a bottom of one side of the fixed seat, the electric wire fixed to one side of the fixed seat can extend to be connected to the impedance measurement plate, and the electric wire fixed to the other side of the movable seat can extend to be coupled to the second charging / discharging bus bar.

[0025] An electric wire can be additionally provided to connect the first charging / discharging bus bar to the impedance measurement plate.

[0026] The movable seat can be slidably coupled to a bottom surface of the fixed seat, and the movable seat can be provided as a frame part in a frame shape such that the movable seat can be located inside the frame part, and an inner surface of the frame part of the movable seat facing the movable seat can serve as a stop surface of the movable seat.

[0027] The movable stand can be slidably coupled to a bottom surface of the fixed stand, and the movable stand and the moving stand can be coupled through a gear coupling.

[0028] The electric wires can include signal wires and sensing wires, the signal wires and the sensing wires can extend in parallel along both sides of the fixed stand and the movable stand in a width direction, the first rods can be configured as a first rod pair including a first signal wire rod R1 and a first sensing wire rod R1', the first signal wire rod R1 and the first sensing wire rod R1' can be installed on both sides of the fixed stand in the width direction, the moving stand can be configured as a moving stand pair including a moving stand for signal wires and a moving stand for sensing wires, the moving stand for signal wires and the moving stand for sensing wires can be slidably coupled to the fixed stand at inner sides of the first signal wire rod and the first sensing wire rod, respectively, and the second rods can be configured as a second rod pair including a second signal wire rod and a second sensing wire rod, the second signal wire rod and the second sensing wire rod can be installed on both sides of the moving stand in a width direction.

[0029] The movable stand can include a frame part in a frame shape and a longitudinal shaft extending in a length direction of the movable stand at an inner central part of the frame part, the longitudinal shaft can have first threads provided on both sides of the longitudinal shaft, the moving stand for sensing wires and the moving stand for signal wires can be interposed between the longitudinal shaft and the frame parts located on both sides of the movable stand in the width direction, second threads can be provided on side surfaces of the moving stand facing the longitudinal shaft, and the longitudinal shaft and the moving stand can be coupled through a gear train installed between the moving stand for sensing wires and the longitudinal shaft and between the moving stand for signal wires and the longitudinal shaft.

[0030] The gear train can include a first gear engaging with the first threads and a second gear engaging with the second threads, and the first gear and the second gear can engage with a gear ratio set such that the moving stand for sensing wires and the moving stand for signal wires can be moved as much as 1 / 2 of a distance moved by the movable stand.

[0031] Advantageous effects

[0032] According to the charging and discharging jig for measuring impedance of a battery cell according to the present application, even when a length of the charging and discharging jig changes, impedance of the battery cell can be measured with high accuracy by maintaining a consistent tension and length of the electric wires. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 is a perspective view showing a charging and discharging jig for measuring impedance of a battery cell according to one embodiment of the present application.

[0034] Figure 2 is a plan view showing a charging and discharging jig for measuring impedance of a battery cell according to one embodiment of the present application.

[0035] Figure 3 is a side view showing a charging and discharging jig for measuring impedance of a battery cell according to one embodiment of the present application.

[0036] Figure 4 is a bottom view showing a charging and discharging jig for measuring impedance of a battery cell according to one embodiment of the present application.

[0037] Figure 5 is an operational state view showing a charging and discharging jig for measuring impedance of a battery cell according to one embodiment of the present application.

[0038] Figure 6 is a schematic view showing a structure and an operational state of a charging and discharging jig for measuring impedance of a battery cell according to another embodiment of the present application.

[0039] Figure 7 is a schematic view showing a structure and an operational state of a charging and discharging jig for measuring impedance of a battery cell according to still another embodiment of the present application.

[0040] is a schematic view showing a structure and an operational state of a charging and discharging jig for measuring impedance of a battery cell according to still another embodiment of the present application. DETAILED DESCRIPTION

[0041] Hereinafter, the present application will be described in detail. Before describing the present application, the terms or words used in the present document and the appended claims should not be interpreted as being limited to the ordinary or dictionary meanings, but should be interpreted in a conceptual and ideal sense, according to the principle that the inventor can appropriately define the concept of the terms in order to describe his or her application in the best way, based on the meaning and concept consistent with the technical spirit of the present application.

[0042] In this application, the terms "comprise", "have" and the like are used to indicate the presence of stated features, numbers, steps, operations, components, elements, or combinations thereof, but do not preclude the presence or addition of one or more other features, numbers, steps, operations, components, elements, or combinations thereof. In addition, when a part of a layer, film, region, plate, etc. is referred to as being "on" another part, this includes not only the case where the part is "directly" on the other part, but also the case where another part is present between the part and the other part. Conversely, when a part of a layer, film, region, plate, etc. is referred to as being "under" another part, this includes not only the case where the part is "directly" under the other part, but also the case where another part is present between the part and the other part. In addition, in this application, "on" can include not only the case of being on the upper part, but also the case of being on the lower part.

[0043] (First Embodiment)

[0044] Hereinafter, the present application will be described in detail.

[0045] Figures 1 to 4 is a perspective view, a plan view, a side view, and a bottom view showing a charging and discharging jig for measuring impedance of a battery cell according to one embodiment of the present application.

[0046] The charging and discharging jig 1000 for measuring impedance of a battery cell according to the present application includes a fixed stand 100 having a first charging / discharging bus bar UB1 and LB1 provided on an upper surface of one side thereof, a movable stand 200 slidably coupled to the fixed stand 100 and having a second charging / discharging bus bar UB2 and LB2 provided on an upper surface of the other side thereof opposite to the one side of the fixed stand 100, a moving stand 300 slidably coupled to a bottom surface of the fixed stand 100, and electric wires L1 and L2 fixed to the one side of the fixed stand 100 and the other side of the movable stand 200 and configured to extend along the bottom surfaces of the fixed stand 100 and movable stand 200. First rods R1 and R1' are installed to protrude from the bottom surface of the fixed stand 100 closer to the movable stand 200 than the moving stand 300, such that the electric wires L1 and L2 extending from the one side of the fixed stand 100 form a first loop having a trajectory that revolves on the first rods R1 and R1' and returns to the fixed stand 100. Second rods R2 and R2' are installed to protrude from the moving stand 300, such that the electric wires L1 and L2 extending from the first loop l1 form a second loop having a trajectory that revolves on the second rods R2 and R2' and goes to the movable stand 200. When the movable stand 200 slides with respect to the fixed stand 100, the moving stand 300 moves in the same direction interlocked with the movable stand 200, such that the lengths of the first loop l1 and second loop l2 are adjusted to absorb a change in tension of the electric wires L1 and L2.

[0047] The charging and discharging jig 1000 for measuring impedance of a battery cell according to the present application is used to measure impedance of a battery cell 10 during charging and discharging of the battery cell. Accordingly, the battery cell 10 is installed on an upper surface of the charging and discharging jig (see Figure 1 and Figure 3 ).

[0048] In addition, in order to charge or discharge the battery cell 10, first charge / discharge bus bars UB1, LB1 and second charge / discharge bus bars UB2 and LB2 coupled to the electrode leads 11 and 12 of the battery cell are provided on both sides of the charging and discharging jig. The first charge / discharge bus bars UB1 and LB1 are installed on the upper surface of the one side of the fixed pedestal 100, and the second charge / discharge bus bars UB2 and LB2 are installed on the upper surface of the other side of the movable pedestal 200 opposite to the one side of the fixed pedestal 100. In the present embodiment, in order to install the first charge / discharge bus bars UB1, LB1 and second charge / discharge bus bars UB2 and LB2, first bus bar frame portions 110 and second bus bar frame portions 210 are installed on the upper surfaces of the one side of the fixed pedestal 100 and the other side of the movable pedestal 200, respectively. First bus bar frames 111 and second bus bar frames 211 are provided on the first bus bar frame portions 110 and second bus bar frame portions 210, respectively, and bus bar installation holes 111a and 211a are formed in the first bus bar frames 111 and second bus bar frames 211 into which the first charge / discharge bus bars UB1, LB1 and second charge / discharge bus bars UB2 and LB2 are inserted. The first charge / discharge bus bars UB1, LB1 and second charge / discharge bus bars UB2 and LB2 are inserted and positioned in the bus bar installation holes 111a and 211a. In order to be coupled to the electrode leads 11 and 12 of the battery cell and connected to the electric wires L1 and L2, some portions of the first charge / discharge bus bars UB1, LB1 and second charge / discharge bus bars UB2 and LB2 are installed to protrude from the front ends and rear ends of the bus bar installation holes 111a and 211a.

[0049] The first and second charge / discharge busbars UB1 and LB1 and the second charge / discharge busbars UB2 and LB2 include upper busbars UB1 and UB2 and lower busbars LB1 and LB2. Electrode leads 11 and 12 protruding from both sides of the battery cell are inserted between the upper busbars UB1 and UB2 and the lower busbars LB1 and LB2, which protrude toward the front of the busbar mounting holes 111a and 211a of the first and second busbar frames 111 and 211, to perform charging or discharging. Support frames 112 and 212 are formed in the front lower portions of the busbar mounting holes 111a and 211a of the first and second busbar frames 111 and 211, and the lower busbars LB1 and LB2 of the first and second charge / discharge busbars are mounted on the support frames 112 and 212. The member T installed below the support frame 112 at the first charge / discharge busbars UB1 and LB1 serves as a reinforcing support member to match the height of the second charge / discharge busbars UB2 and LB2. The upper busbars UB1 and UB2 of the first and second charge / discharge busbars are installed on the lower busbars LB1 and LB2 at a distance from them. To accommodate the upper busbars UB1 and UB2, upper busbar coupling frames 113 and 213 are formed to protrude from the upper front portions of the busbar mounting holes 111a and 211a of the first and second busbar frame portions 110 and 210. Upper busbar adjustment knobs 114 and 214, each having a bolt shaft structure, are installed in the upper busbar coupling frames 113 and 213.

[0050] Meanwhile, insulators 115 and 215 are installed between the upper busbar coupling frames 113 and 213 and the upper busbars UB1 and UB2 of the first and second charge / discharge busbars, and are coupled to the upper portions of the upper busbars UB1 and UB2. Upper busbar adjustment knobs 114 and 214 thread through the upper busbar coupling frames 113 and 213 and are screwed to the insulators 115 and 215. Accordingly, when the upper busbar adjustment knobs 114 and 214 are rotated, the insulators 115 and 215 and the upper busbars UB1 and UB2 are moved upward or downward. Therefore, the electrode leads 11 and 12 of the battery cells can be easily inserted and removed between the upper busbars UB1 and UB2 and the lower busbars LB1 and LB2.

[0051] The structure for installing the first and second charge / discharge bus bars in the charge and discharge jig is only one example, and thus the present application is not limited to the structure described above. A bus bar frame portion having a structure different from that of the bus bar frame portion described above can be employed as long as it is capable of inserting the electrode leads 11 and 12 of the battery cell 10 between the upper bus bars UB1 and UB2 and the lower bus bars LB1 and LB2 of the first and second charge / discharge bus bars.

[0052] The charge and discharge jig 1000 for measuring impedance according to the present application includes electric wires L1 and L2 for measuring impedance. For impedance measurement, the electric wires L1 and L2 typically include a signal line L1 for applying an alternating current (AC) signal and a sense line L2 for sensing a response from the battery cell with respect to the applied signal. In addition, a power line (not shown) connected to a power source can be included as necessary. To simplify wiring, the power line can be twisted and coupled to the sense line. To prevent noise from occurring in the AC signal, it is recommended to avoid coupling the power line to the signal line.

[0053] To avoid interference with the battery cell 10 installed in the upper portion of the charge and discharge jig, the electric wires L1 and L2 are installed to extend along the bottom surfaces of the fixed seat 100 and the movable seat 200. In addition, to prevent the lengths of the electric wires L1 and L2 from changing during the sliding movement of the movable seat 200 described below, the electric wires L1 and L2 are fixed to one side of the fixed seat 100 and the other side of the movable seat 200, respectively. That is, the lengths of the electric wires L1 and L2 extending between one side of the fixed seat 100 and the other side of the movable seat 200 remain constant.

[0054] Reference Figure 4 The predetermined fixed jigs 150 and 240 are installed to fix the electric wires L1 and L2 to one side of the fixed seat 100 and the other side of the movable seat 200.

[0055] The charge and discharge jig 1000 for measuring impedance of a battery cell according to the present application is provided with first and second charge / discharge bus bars on both sides, electrode leads of the battery cell are coupled to the first and second charge / discharge bus bars, and the charge and discharge jig 1000 is a charge and discharge jig capable of being displaced in the length direction of the battery cell. The displacement of the charge and discharge jig is achieved by the sliding and relative movement of the movable seat 200 with respect to the fixed seat 100.

[0056] The sliding connection between the movable pedestal 200 and the fixed pedestal 100 can be achieved by connecting the guide slit 220 and the sliding support member 120. For example, the guide slit 220 may be formed on both sides in the width direction of one of the fixed pedestal 100 and the movable pedestal 200, and the sliding support member 120 inserted into the guide slit may be installed in the other of the fixed pedestal 100 and the movable pedestal 200. The sliding support member 120 slides along the guide slit 220, so that the movable pedestal 200 can slide to move along the fixed pedestal 100. In this case, the guide slit 220 may be installed in the fixed pedestal 100 or the movable pedestal 200. Figures 1 to 4 In the embodiment of the present invention, the guide slits 220 are formed on both sides of the movable pedestal 200 in the width direction, and the sliding support members 120 are formed on both sides of the fixed pedestal 100 in the width direction. However, in the embodiment described below, Figure 6 and Figure 7 In the embodiment, the guide slit 220 is formed in the fixed pedestal 100 , and the slide support member 120 is formed in the movable pedestal 200 .

[0057] As in Figure 1 As shown in the enlarged view of the main part in FIG, the sliding support member 120 may include: a body portion that is inserted into the guide slit 220 and is screwed to the fixed base 100 ( Figures 1 to 4 ), or is threadedly coupled to the movable pedestal 200 ( Figure 6 and Figure 7 embodiment); and a head portion having a width greater than that of the guide slit. Since the head portion has a width greater than that of the guide slit 220, it is possible to prevent the sliding support member 120 from being separated from the guide slit 220, and thus it is possible to prevent the movable pedestal 200 from being separated from the fixed pedestal 100. In addition, since the body portion of the sliding support member 120 is provided with a thread and is threadedly coupled to the fixed pedestal 100 or the movable pedestal 200, the movable pedestal 200 can be fixed to the fixed pedestal 100 by adjusting the degree of threaded coupling. That is, as in Figure 1 As shown in the enlarged view of the main part in FIG, after the movement of the movable pedestal 200 is completed, when the sliding support member 120 is further rotated to move the head downward, the head presses both edges of the guide slit 220 so that the movable pedestal 200 can be fixed to the fixed pedestal 100.

[0058] The movable pedestal 200 may be slidably coupled to the upper surface or the lower surface of the fixed pedestal 100. Figures 1 to 4 In the embodiment of the present invention, the movable pedestal 200 is connected to the upper surface of the fixed pedestal 100, and Figure 6 and Figure 7In an embodiment of the present application, the movable stage 200 is slidably coupled to the bottom surface of the fixed stage 100. In the present specification, the movable stage 200 is slidably coupled to the fixed stage 100 due to the coupling between the guide slit 220 and the sliding support member 120, but the present application is not limited thereto. For example, a guide rail can be formed on both sides in the width direction of one of the movable stage 200 and the fixed stage 100, and a guide groove coupled to the guide rail can be formed on both sides in the width direction of the other of the movable stage 200 and the fixed stage 100. Alternatively, various types of sliding coupling structures applied in the mechanical field can be employed between the movable stage 200 and the fixed stage 100.

[0059] The first and second charge / discharge bus bars are installed in the upper portions of one side of the fixed stage 100 and the other side of the movable stage 200 opposite to the one side of the fixed stage 100, and the support frames 130 and 230 are installed in the lower portions of the one side of the fixed stage 100 and the one side of the movable stage 200 opposite to the one side of the fixed stage 100. The support frames 130 and 230 are coupled to the fixed stage 100 and the movable stage 200, and the support frame 230 of the one side or the other side of the movable stage 200 is moved to the fixed stage 100 so that the charge and discharge jigs can be displaced.

[0060] As described above, the electric wires L1 and L2 installed on the bottom surfaces of the fixed stage 100 and the movable stage 200 for impedance measurement are fixed to one side of the fixed stage 100 and the other side of the movable stage 200, respectively, so that the lengths of the electric wires L1 and L2 are kept constant. Here, the electric wires L1 and L2 can be fixedly installed on the bottom surface of the one side of the fixed stage 100 or the bottom surface of the other side of the movable stage 200. However, the present application is not limited thereto. For example, the electric wires L1 and L2 can be fixed to the support frame 130 connected to the one side of the fixed stage 100 and the support frame 230 connected to the other side of the movable stage 200. That is, in the present application, the fixing of the electric wires L1 and L2 to the one side of the fixed stage 100 and the other side of the movable stage 200 includes the case in which the electric wires L1 and L2 are directly fixed to the one side and the other side and the case in which the electric wires L1 and L2 are fixed to other members coupled to the one side and the other side.

[0061] In addition to the length of the fixed wires L1 and L2, the present application has a structure in which the tension of the wires L1 and L2 is maintained constant when the wires L1 and L2 are moved due to the movement of the movable pedestal 200. To this end, the present application is provided with a moving pedestal 300 which is slidably coupled to the bottom surface of the fixed pedestal 100. In addition, first rods R1 and R1' are provided on the bottom surface of the fixed pedestal 100, the wires L1 and L2 are caught and supported on the first rods R1 and R1', and the moving pedestal 300 is provided with second rods R2 and R2' on which the wires L1 and L2 are caught and supported. The sliding coupling of the moving pedestal 300 can be a coupling between a guide rail and a guide groove. For example, as well shown in Figure 3 and Figure 4 , the guide rail 140 can be installed on the bottom surface of the fixed pedestal 100, and the guide groove of the moving pedestal 300 can be coupled to the guide rail. Alternatively, a structure in which the guide groove is formed on the bottom surface of the fixed pedestal 100, and the guide rail is installed in the moving pedestal 300 is possible.

[0062] Referring to Figure 3 and Figure 4 , the first rods R1 and R1' are installed to protrude from the bottom surface of the fixed pedestal 100 closer to the movable pedestal 200 than the moving pedestal 300. That is, the second rods R2 and R2' are installed to protrude from the moving pedestal 300 closer to the side of the fixed pedestal 100 than the first rods R1 and R1'.

[0063] Correspondingly, as shown in Figure 4 , the wires L1 and L2 extending from the side of the fixed pedestal 100 form a first loop having a trajectory that turns on the first rods R1 and R1' and returns to the fixed pedestal 100, and the wires L1 and L2 extending from the first loop l1 form a second loop having a trajectory that turns on the second rods R2 and R2' and goes to the movable pedestal 200. The present application has a technical idea of varying the length of the first and second loops and absorbing the change in the tension of the wires L1 and L2. That is, according to the present application, when the movable pedestal 200 slides to move with respect to the fixed pedestal 100, the moving pedestal 300 moves in the same direction interlocked with the movable pedestal 200, so that the length of the first and second loops is adjusted to absorb the change in the tension of the wires.

[0064] For example, when the movable stage 200 is moved toward the fixed stage 100, the electric wires L1 and L2 fixed to the movable stage 200 are moved together, so that the tension of the electric wires L1 and L2 disposed between the fixed stage 100 and the movable stage 200 can be loosened. In this case, when the moving stage 300 moves in the same direction as the movement of the movable stage 200 in interlock with the movement of the movable stage 200, the electric wires L1 and L2 caught on the second rods R2 and R2' of the moving stage 300 are moved together. Accordingly, the tension of the electric wires L1 and L2 is restored, so that the electric wires L1 and L2 are again kept taut. In contrast, when the movable stage 200 moves away from the fixed stage 100, excessive tension can be applied to the electric wires L1 and L2 fixed to the movable stage 200. In this case, when the moving stage 300 moves in the same direction as the movement of the movable stage 200 (i.e., away from the fixed stage 100) in interlock with the movement of the movable stage 200, the electric wires L1 and L2 caught on the second rods R2 and R2' of the moving stage 300 are moved together. Accordingly, the tension applied to the electric wires L1 and L2 is released.

[0065] Reference Figure 4 The signal line L1 and the sensing line L2 extend in parallel along both sides of the fixed stage 100 and the movable stage 200 in the width direction. The signal line L1 and the sensing line L2 are fixed to one side of the fixed stage 100 and the other side of the movable stage 200, respectively, and extend along the bottom surfaces of the fixed stage 100 and the movable stage 200. According to the number of electric wires L1 and L2, the first rods R1 and R1' are configured as a first rod pair including a first signal line rod R1 and a first sensing line rod R1' disposed on both sides of the fixed stage 100 in the width direction. The moving stage 300 is disposed between the first signal line rod R1 and the first sensing line rod R1', and according to the number of electric wires L1 and L2, the second rods R2 and R2' are also configured as a second rod pair including a second signal line rod R2 and a second sensing line rod R2' disposed on both sides of the moving stage 300 in the width direction. Extensions are formed at each of the end portions of the first (pair of) rods and the second (pair of) rods to prevent the electric wires L1 and L2 from being separated from the rods (see FIG. 2). Figure 3 ).

[0066] There can be various mechanisms for interlocking the moving stage 300 with the movable stage 200 in the same direction. In the present embodiment, an elastic member S can be disposed to enable interlocked movement of the moving stage 300 and the movable stage 200, the elastic member S having one end disposed on one side of the fixed stage 100 and the other end coupled to the moving stage 300. The elastic member S applies a force (elastic force) that pulls the moving stage 300 toward one side of the fixed stage 100.

[0067] Reference will be madeFigure 5 The interlocking movement process and the tension variation absorbing process of the movable base 300 and the movable base 200, which are implemented by the elastic member S, will be described.

[0068] Figure 5 is a diagram showing an operation state of a charging and discharging jig for measuring impedance of a battery cell according to one embodiment of the present application.

[0069] Figure 5 a is a diagram showing a state in which the elastic member S exerts a force to the movable base 300 in a state in which the movable base 200 is stopped with respect to the fixed base 100. In this state, when the movable base 200 is pulled away from the fixed base 100 as shown in Figure 5 b, the electric wires L1 and L2 installed on one side of the movable base 200 are pulled, so the electric wires L1 and L2 are wound, and the second bars R2 and R2' forming the second loop l2 are moved in the moving direction of the movable base 200. That is, the movable base 300 having the second bar pair is moved in the same direction as the movable base 200. As the movable base 300 is moved, the tension applied to the electric wires L1 and L2 connected to the movable base 200 is released. In this case, the movable base 300 is moved toward the movable base 200 against the elastic force of the elastic member S. That is, by means of the elastic force of the elastic member S, the increase of the tension of the electric wires L1 and L2 according to the movement of the movable base 200 and the decrease or absorption of the tension according to the interlocking movement of the movable base 300 are smoothly performed.

[0070] Meanwhile, a case in which the movable base 200 is moved toward the fixed base 100 from the state shown in Figure 5 a as shown in Figure 5 b will be described. In this case, as the movable base 200 is moved toward the fixed base 100, the tension of the electric wires L1 and L2 fixed to the movable base 200 is decreased, and the elastic member S pulls the movable base 300 and the second bars R2 and R2' to move the movable base 300 toward the fixed base 100. Accordingly, the decreased tension is recovered due to the movement of the movable base 300 and the elastic force of the elastic member S.

[0071] According to the movement of the movable base 300 and the second bars R2 and R2', the length of the second loop l2 revolved on the second bars R2 and R2' is varied, so the length of the first loop l1 revolved on the first bars R1 and R1' installed in the fixed base 100 is also varied.

[0072] Accordingly, according to the present application, the mobile pedestal 300 is moved in the same direction in interlocking with the movable pedestal 200, so that the lengths of the first and second rings are adjusted, and thus the changes in the tension of the electric wires L1 and L2 are absorbed. Accordingly, the lengths of the electric wires L1 and L2 fixed to the fixed pedestal 100 and the movable pedestal 200 can be kept constant, and the tension can also be kept constant when the movable pedestal 200 is moved. When the lengths and the tension of the signal and sensing lines for impedance measurement are kept constant, changes in the lengths of the electric wires L1 and L2 or changes in their lengths due to changes in their tension are prevented. Accordingly, generation of noise due to changes in the lengths of the electric wires L1 and L2 is prevented, so that the impedance of the battery cell can be measured more accurately.

[0073] Reference Figures 1 to 4 , the impedance measurement plate 400 is coupled to the bottom of one side of the fixed pedestal 100. As shown in the drawing, when the measurement plate 400 for measuring impedance is installed in the charging and discharging jig, it is not necessary to draw out the electric wires L1 and L2 to the outside for a long distance for impedance measurement. Accordingly, the accuracy of impedance measurement can be further increased. In order to support the impedance measurement plate 400, a measurement plate support 410 is coupled to the impedance measurement plate 400.

[0074] In order to complete the circuit for measuring impedance, the electric wires L1 and L2 fixed to the fixed jig 150 on one side of the fixed pedestal 100 are extended and connected to the impedance measurement plate 400. Reference numeral 160 denotes a coupling portion (fixed jig) at which the extended electric wires are coupled to the impedance measurement plate 400. The electric wires L1 and L2 can be extended and coupled to the second charging / discharging bus bar fixed to the fixed jig 240 of the other side of the movable pedestal 200. The electric wires L1' and L2' extended to the second charging / discharging bus bar are coupled to the second charging / discharging bus bar through a coupling member C (see Figure 3 ). In addition, electric wires L1" and L2" connecting the first charging / discharging bus bar to the impedance measurement plate 400 are additionally provided, so that the impedance measurement circuit is completed by the impedance measurement plate 400. The electric wires L1" and L2" are also coupled to the first charging / discharging bus bar through the coupling member C. For reference, in the present application, in order to measure impedance by the four-terminal method, the upper bus bars UB1 and UB2 are formed as two separate metal blocks as shown in Figure 2 , and the electric wires L1 and L2 of the signal and sensing lines are connected to the metal blocks of the upper bus bars UB1 and UB2, respectively.

[0075] (Second Embodiment)

[0076] Figure 6is a schematic diagram showing a structure and an operation state of a charging and discharging jig for measuring impedance of a battery cell according to another embodiment of the present application.

[0077] The second embodiment is different from the first embodiment in that the movable stand 200' is slidably coupled to the bottom surface of the fixed stand 100' instead of the upper surface thereof, and a pair of guide rails 120' for guiding the moving stand 300' are formed on both sides in the width direction of the fixed stand 100'.

[0078] In addition, the second embodiment is different from the first embodiment in that the movable stand 200' is provided with a frame part F having a frame shape, and the moving stand 300' is located inside the frame part F. When the moving stand 300' is located inside the frame part F, the inner surface Fl of the frame part of the movable stand 200' facing the moving stand 300' can serve as a stop surface of the moving stand 300'.

[0079] In particular, with reference to Figure 6 a, the moving stand 300' is slidably coupled to the guide rails 120' of the fixed stand 100' inside the frame part F of the movable stand 200'. In this state, the movable stand 200' is placed as far away from the fixed stand 100' as possible, so that the inner surface Fl of the frame part of the movable stand 200' is in contact with the front surface of the moving stand 300'. That is, in this case, even when the elastic member S pulls the moving stand 300', the moving stand 300' is blocked by the inner surface Fl of the frame part and cannot be moved toward the fixed stand 100'. In this way, the inner surface Fl of the frame part serves as a stop surface of the moving stand 300'.

[0080] When the movable stand 200' is moved in the state of Figure 6 a, the frame part F of the movable stand 200' is spaced apart from the moving stand 300', so that the moving stand 300' is interlocked and moved toward the fixed stand 100' due to the elastic force of the elastic member S (see Figure 6 b). When the movable stand 200' is further moved, the moving stand 300' is also moved in interlock with the movement of the movable stand 200', and when the elastic force of the elastic member S is not applied, the moving stand 300' stops (see Figure 6 c). Therefore, even in the present embodiment, the reduction of the tension of the electric wires L1 and L2 according to the movement of the movable stand 200' and the increase or absorption of the tension according to the interlocked movement of the moving stand 300' are smoothly performed by means of the elastic force of the elastic member S.

[0081] Figure 6 d is a side cross-sectional view along Figure 6 a side cross-sectional view along A-A line of a. As shown in the drawing, the sliding support members 220' formed on both sides in the width direction of the mobile pedestal 300' are guided along the guide slits 120' formed on both sides in the width direction of the fixed pedestal 100'. In addition, Figure 6 d shows that the mobile pedestal 300' is provided with two guide grooves to be slidably coupled to the fixed pedestal 100', the two guide grooves being coupled to the two guide rails 140 and 140' installed on the bottom surface of the fixed pedestal 100'. In addition, Figure 6 d shows that the first rods R1 and R1' and the second rods R2 and R2' are installed on both sides in the width direction of the fixed pedestal 100' and both sides in the width direction of the mobile pedestal 300'.

[0082] Meanwhile, the movable pedestal 200' is provided with a longitudinal shaft 250 extending in the length direction of the movable pedestal 200' in addition to the frame part F. In the present embodiment, the thickness of the longitudinal shaft 250 is formed to be smaller than the thickness of the frame part, so that the mobile pedestal 300 is supported on the longitudinal shaft 250 inside the frame part F (see Figure 6 a and 6d).

[0083] (Third Embodiment)

[0084] Figure 7 is a schematic diagram showing the structure and operating state of a charging and discharging jig for measuring the impedance of a battery cell according to still another embodiment of the present application.

[0085] Unlike the first and second embodiments, the present embodiment employs a gear engagement structure as an interlocking movement structure between the mobile pedestal 300" and the movable pedestal 200". That is, in the present embodiment, the movable pedestal 200" is slidably coupled to the bottom surface of the fixed pedestal 100", and the movable pedestal 200" and the mobile pedestal 300" are coupled by gear coupling.

[0086] The present embodiment differs from the first embodiment in that the movable pedestal 200" is slidably coupled to the bottom surface of the fixed pedestal 100" rather than the upper surface thereof, and the guide rail 120" for guiding the mobile pedestal 300" is formed on both sides in the width direction of the fixed pedestal 100".

[0087] Even in the present embodiment, the electric wires L1 and L2 include the signal lines and the sense lines that extend in parallel along both sides in the width direction of the fixed stand 100" and the movable stand 200". Therefore, the first rods R1 and R1' are configured as a first rod pair that includes the first signal line rod R1 and the first sense line rod R1' that are installed on both sides in the width direction of the fixed stand 100.

[0088] The present embodiment differs from the first embodiment and the second embodiment in that two movable stands 300" are provided. The movable stands 300" are formed as a movable stand pair that includes a movable stand 300" for a signal line and a movable stand 300" for a sense line that are slidably coupled to the fixed stand 100 at inner sides with respect to the first signal line rod and the first sense line rod. Correspondingly, the second rods R2 and R2' are also formed as a second rod pair that includes the second signal line rod R2 and the second sense line rod R2' that are installed on both sides in the width direction of the movable stand 300".

[0089] The gear engagement structure between the movable stand 200" and the movable stands 300" is as follows.

[0090] The movable stand 200" includes a frame portion F having a frame shape and a longitudinal shaft 250 that extends in the lengthwise direction of the movable stand 200" in an inner central portion of the frame portion F and that has a first thread 251 formed on both side surfaces of the longitudinal shaft 250. In addition, the movable stand 300" for a sense line and the movable stand 300" for a signal line are interposed between the frame portion F on both sides in the width direction of the movable stand 200" and the longitudinal shaft 250, and a second thread is formed on the side surface of the movable stand 300" that faces the longitudinal shaft 250.

[0091] The longitudinal shaft 250 and the movable stands 300 are coupled by a gear train that is installed between the movable stand 300" for a sense line and the longitudinal shaft 250 and between the movable stand 300" for a signal line and the longitudinal shaft 250.

[0092] In this case, the gear train includes a first gear G1 that engages with the first thread 251 and a second gear G2 that engages with the second thread, and the first gear G1 and the second gear G2 engage with a gear ratio that is set so that the movable stand 300" for a sense line and the movable stand 300" for a signal line are moved by a distance that is as large as 1 / 2 of the distance by which the movable stand 200" is moved.

[0093] In particular, reference is made to Figure 7a, the moving stand 300" for the sensing line and the moving stand 300" for the signal line are engaged with the longitudinal shaft 250 gear formed in the frame part F of the movable stand 200" with the first gear G1 and the second gear G2 therebetween. This state is a state in which the movable stand 200" is placed as far away from the fixed stand 100" as possible.

[0094] When the movable stand 200" is moved to the fixed stand 100" in the state of a, Figure 7 a, the longitudinal shaft 250 of the movable stand 200" is moved to the fixed stand 100", and the first gear G1 engaged with the first thread 251 of the longitudinal shaft is rotated. Accordingly, the second gear G2 engaged with the first gear G1 is also rotated, and the moving stand 300" (the moving stand for the sensing line and the moving stand for the signal line) having the second thread engaged with the second gear G1 is interlocked and moved toward the fixed stand 100" (see Figure 7 b). When the movable stand 200" is further moved, the moving stand 300" is also interlocked and moved due to the gear engagement, and at the point in time when the movement of the movable stand 200" is terminated, the rotation of the gears is stopped so that the moving stand 300" is stopped (see Figure 7 c).

[0095] Even in the present embodiment, the reduction of the tension of the electric wires L1 and L2 according to the movement of the movable stand 200" and the increase or absorption of the tension according to the interlocked movement of the moving stand 300" are smoothly performed by means of the gear engagement. In this case, by adjusting the gear ratio between the first gear G1 and the second gear G2, the moving distance of the moving stand 300" with respect to the movable stand 200" can be adjusted. Therefore, the tension of the electric wires L1 and L2 supported by the second rods R2 and R2' of the moving stand 300" can be uniformly adjusted. For example, the gear ratio of the first gear and the second gear can be set so that the moving stand 300" for the sensing line and the moving stand 300" for the signal line are moved as much as a distance of 1 / 2 of the distance moved by the movable stand 200".

[0096] Figure 7 d is a state in which the movable stand 200" is moved to the fixed stand 100" in the state of a, Figure 7A side cross-sectional view of the B-B line of the a. As shown in the drawing, the sliding support members 220" formed on both sides in the width direction of the mobile pedestal 300" are guided along the guide slits 120" formed on both sides in the width direction of the fixed pedestal 100". In addition, the mobile pedestal 300" is formed as two mobile pedestals 300" which are coupled to two guide rails 140 and 140' installed on the bottom surface of the fixed pedestal 100" and have a second signal pole R2 and a second sensing pole R2' provided thereunder. In addition, Figure 7 d shows that the first poles R1 and R1' are installed on both sides in the width direction of the fixed pedestal 100".

[0097] In addition, Figure 7 d shows that the movable pedestal 200" is provided with a longitudinal shaft 250 extending in the length direction of the movable pedestal in the central portion of the frame portion F, and a first gear G1 and a second gear G2 are gear-engaged between the longitudinal shaft 250 and the mobile pedestal 300. The first and second gears can be installed on the bottom surface of the fixed pedestal 100" to be stably supported.

[0098] While embodiments have been described with reference to a number of illustrative embodiments constructed in accordance with the principles of the present application, it is to be understood that various modifications and implementations can be made by those skilled in the art which fall within the spirit and scope of the principles of this application. Therefore, the drawings disclosed herein are to be interpreted in the manner set forth in the preceding paragraphs, and should not be considered limiting of the conceptual underpinnings of the present application. The scope of the technology is to be understood only from the appended claims.

[0099] Meanwhile, although terms indicating up, down, left, right, front, and rear directions are used in the present specification, these terms are only for convenience of description, and it is obvious that these terms can vary depending on the position of an object or an observer.

[0100] (Explanation of Reference Numerals)

[0101] 10: battery cell

[0102] 11, 12: electrode lead

[0103] 100, 100', 100": fixed pedestal

[0104] 110: first busbar frame

[0105] 120: guide slit

[0106] 130: support frame

[0107] 140: guide rail

[0108] 150: electric wire fixing jig

[0109] 160: electric wire fixing jig

[0110] 200, 200', 200": movable stage

[0111] 210: second bus bar frame

[0112] 220: sliding support member

[0113] 230: support frame

[0114] 240: electric wire fixing jig

[0115] 300, 300', 300": moving stage

[0116] R1, R1': first rod

[0117] R2, R2': second rod

[0118] L1, L2: electric wire

[0119] l1, l2: first and second rings

[0120] S: elastic member

[0121] F: frame portion

[0122] F1: inner surface of frame portion

[0123] 250: longitudinal shaft

[0124] 251: first screw thread

[0125] G1: first gear

[0126] G2: second gear

[0127] 400: impedance measurement board

[0128] 410: measurement board support

Claims

1. A charging and discharging fixture for measuring the impedance of a battery cell, the charging and discharging fixture comprising: a fixed base, wherein a first charge / discharge bus bar is provided on an upper surface of one side of the fixed base; a movable pedestal slidably coupled to the fixed pedestal and having a second charge / discharge bus bar provided on an upper surface of the movable pedestal on the other side opposite to the one side of the fixed pedestal; a moving stand slidably coupled to a bottom surface of the fixed stand; and an electric wire fixed to the one side of the fixed pedestal and the other side of the movable pedestal and configured to extend along bottom surfaces of the fixed pedestal and the movable pedestal, wherein a first rod is installed so as to protrude from the bottom side of the fixed pedestal closer to the movable pedestal than the moving pedestal, and the electric wire extending from the one side of the fixed pedestal forms a first loop having a trajectory of rotating on the first rod and returning to the fixed pedestal, A second rod is installed to protrude from the movable pedestal, and the electric wire extending from the first ring forms a second ring having a trajectory that turns on the second rod and goes to the movable pedestal, and When the movable pedestal slides to move relative to the fixed pedestal, the movable pedestal is interlocked to the movable pedestal and moves in the same direction as the movable pedestal, so that the lengths of the first and second rings are adjusted to absorb changes in tension of the electric wires.

2. The charging and discharging jig according to claim 1 , further comprising an elastic member, one end of the elastic member being mounted on the one side of the fixed base and the other end being coupled to the movable base, and the elastic member applying a force that pulls the movable base toward the one side of the fixed base.

3. The charging and discharging jig according to claim 2, wherein: The electric wires include a signal line and a sensing line, and the signal line and the sensing line extend in parallel along both sides of the fixed base and the movable base in a width direction; The first rods are configured as a first rod pair, the first rod pair including a first signal wire rod and a first sensing wire rod, the first signal wire rod and the first sensing wire rod being installed on both sides of the fixing base in the width direction; and The moving base is installed between the first signal wire rod and the first sensing wire rod, and the second rod is configured as a second rod pair, the second rod pair including a second signal wire rod and a second sensing wire rod, and the second signal wire rod and the second sensing wire rod are installed on both sides of the moving base in the width direction.

4. The charging and discharging jig according to claim 3, wherein: The movable pedestal is slidably coupled to an upper surface of the fixed pedestal.

5. The charging and discharging jig according to claim 1, wherein: Guide slits are formed on both sides in the width direction of one of the fixed pedestal and the movable pedestal, and a sliding support member inserted into the guide slit is installed in the other of the fixed pedestal and the movable pedestal.

6. The charging and discharging jig according to claim 5, wherein: The sliding support member comprises: a body portion that is inserted into the guide slit and is threadably coupled to the fixed pedestal or the movable pedestal; and A head portion has a width greater than a width of the guide slit.

7. The charging and discharging jig according to claim 1, wherein: A guide rail is installed on a bottom surface of the fixed stage, and the moving stage is slidably coupled to the guide rail.

8. The charging and discharging jig according to claim 1, wherein: Extensions are formed in ends of the first and second rods.

9. The charging and discharging jig according to claim 1, wherein: An impedance measurement board is coupled to the bottom of the one side of the fixing base; and The electric wire fixed to the one side of the fixed pedestal extends to be connected to the impedance measurement board, and the electric wire fixed to the other side of the movable pedestal extends to be coupled to the second charge / discharge bus bar.

10. The charging and discharging jig according to claim 9, wherein: An electric wire is additionally provided to connect the first charge / discharge bus bar to the impedance measurement board.

11. The charging and discharging jig according to claim 3, wherein: The movable pedestal is slidably coupled to a bottom surface of the fixed pedestal; and The movable stage is provided as a frame portion of a frame shape so that the moving stage is located inside the frame portion, and an inner surface of the frame portion of the movable stage facing the moving stage serves as a stopper surface for the moving stage.

12. The charging and discharging jig according to claim 1, wherein: The movable pedestal is slidably coupled to a bottom surface of the fixed pedestal; and The movable pedestal and the moving pedestal are coupled via a gear coupling.

13. The charging and discharging jig according to claim 12, wherein: The electric wires include a signal line and a sensing line, and the signal line and the sensing line extend in parallel along both sides of the fixed base and the movable base in a width direction; The first rods are configured as a first rod pair, the first rod pair including a first signal wire rod and a first sensing wire rod, the first signal wire rod and the first sensing wire rod being installed on both sides of the fixing base in a width direction; The movable pedestal is configured as a movable pedestal pair, the movable pedestal pair including a movable pedestal for a signal line and a movable pedestal for a sensing line, the movable pedestal for a signal line and the movable pedestal for a sensing line being slidably coupled to the fixed pedestal at inner sides of a first signal line rod and a first sensing line rod, respectively; and The second rods are configured as a second rod pair including a second signal wire rod and a second sensing wire rod, and the second signal wire rod and the second sensing wire rod are installed on both sides of the moving base in a width direction.

14. The charging and discharging jig according to claim 13, wherein: The movable pedestal includes a frame portion having a frame shape and a longitudinal axis extending in a length direction of the movable pedestal at an inner center portion of the frame portion and having first threads provided on both sides of the longitudinal axis; The movable stage for the sensing line and the movable stage for the signal line are disposed between the longitudinal axis and frame portions located on both sides in the width direction of the movable stage, and second screw threads are provided on side surfaces of the movable stages facing the longitudinal axis; and The longitudinal shaft and the moving stage are coupled through a gear train disposed between the moving stage for the sensing line and the longitudinal shaft and between the moving stage for the signal line and the longitudinal shaft.

15. The charging and discharging jig according to claim 14, wherein: The gear train includes a first gear engaged with the first thread and a second gear engaged with the second thread, and the first gear and the second gear are engaged with a gear ratio set so that the movable stage for the sensing line and the movable stage for the signal line are moved as much as 1 / 2 of the distance moved by the movable stage.

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