KR20080062969A - Fixation device for insulation resistance measurement of battery - Google Patents

Abstract

A fixation device for measuring an insulation resistance of a battery is provided to secure reproduction repeatability for a plurality of test samples without constructing a complicated circuit to decompose the test samples or connect a resistance measurement device and a control device. A fixation device for measuring an insulation resistance of a battery includes a base plate(100), a lower jig, and an upper jig(300). The base plate mounts the battery. The lower jig includes a metal layer connection unit in contact with an end of an outer circumferential surface of a thermal fusion sealing unit of the battery and a probe connection unit in contact with a measurement probe of a resistance measurement device, and is fixed to one side of the base plate while the battery is mounted on the base plate. The upper jig detachably fixes the thermal fusion sealing unit while the battery is mounted on the base plate.

Description

Fixing device for measuring insulation resistance of batteries {Fixation Device for Insulation Resistance Measurement of Battery}

1 is a perspective view of a typical representative pouch type battery;

2 and 3 are front and side views, respectively, of a fixing device for measuring insulation resistance according to an embodiment of the present invention;

4 is a front view of a removable fastening member used in the fixing device for measuring insulation resistance of FIG. 2;

5 is a partially enlarged cross-sectional view of the coupling structure of the upper and lower jig in the fixing device for measuring insulation resistance of FIG.

6 to 8 are photographs of a fixing device for measuring insulation resistance according to another embodiment of the present invention;

9 is a photograph of a scene of measuring insulation resistance of a secondary battery using an insulation resistance measurement system according to an exemplary embodiment of the present invention.

<Description of Major Symbols in Drawing>

100: base plate 200: lower jig

300: upper jig 400: removable fastening member

500: Test Specimen 600: Probe for Resistance Measurement

The present invention relates to a fixing device for measuring the insulation resistance of the heat-sealed sealing part in the secondary battery of the laminate sheet, and more particularly, after mounting the electrode assembly in the battery case of the laminate sheet comprising a metal layer and a resin layer A battery of a structure sealed by fusion, comprising: a base plate on which a battery is mounted, for fixing a battery for measuring resistance ("insulation resistance") of a metal layer and an electrode terminal; In the state where the battery is mounted on the base plate, a connection part ("metal layer connection part") contacting the end of the outer circumferential surface of the heat-sealing sealing part of the battery and a connection part ("probe connection part") to which a measurement probe of a predetermined resistance meter is contacted A lower jig, the lower jig being fixed to one side of the base plate; And an upper jig for detachably fixing the heat-sealing sealing part of the battery together with the lower jig while the battery is mounted on the base plate.

Due to the recent trend toward the miniaturization of mobile devices, there is an increasing demand for thinner rectangular batteries and pouch-type batteries. In particular, for pouch-type batteries that are easy to deform, low in manufacturing cost and light in weight. Interest is high. A pouch type battery is a battery in which an electrode assembly having a cathode / separation membrane / cathode structure is built in a battery case in which a laminate sheet including a resin layer and a metal layer is formed in a pouch type.

Looking at the battery case of the laminate sheet structure in more detail, it consists of an inner sealant layer for sealing, a metal layer to prevent the penetration of material, and an outer resin layer forming the outermost of the case. Among them, the inner sealant layer is thermally fused to each other by applied heat and pressure in a state in which the electrode assembly is embedded, and serves to provide a sealability, and mainly consists of CPP (non-stretched polypropylene film). The metal layer serves to prevent air, moisture, and the like from flowing into the battery, and mainly aluminum (Al) is used. In addition, since the outer resin layer serves to protect the battery from the outside, excellent tensile strength and weather resistance to the thickness are required, and ONy (stretched nylon film) is frequently used.

As described above, the laminate sheet used for the battery case or the electronic component case mainly uses aluminum (Al) as the metal layer. Aluminum is preferred as a material for metal layers because of its low ductility and low ductility, which enables the blocking of gas and processing of thin films. In addition, since the battery case serves to ensure stable operation by sealing the electrode assembly in an insulated state, the metal layer of the laminate sheet of the battery case needs to be electrically insulated.

However, there is a case where the metal layer of the laminate sheet is in electrical connection with the electrode lead unexpectedly during the assembly or use of the battery. Since aluminum has a large electromotive force difference between the electrode lead as a metal layer and a nickel material mainly, corrosion of the aluminum proceeds when the secondary battery is charged and discharged in the above electrical connection state. That is, when the metal layer comes into contact with the electrode terminal due to various causes, the insulation resistance is lowered. In this state, problems such as increased corrosion of the metal layer and a short circuit occur, thereby shortening the life of the battery rapidly. Battery safety also poses a major threat.

In particular, the secondary battery used in the medium-large battery pack which is a power source of an electric vehicle, a hybrid vehicle, etc. needs a long life and it is very important to secure safety due to the fact that many battery cells are concentrated. Therefore, in order to check whether the metal layer of the battery case is electrically insulated from the electrode lead, a technique for measuring the insulation resistance of the secondary battery is required.

In order to solve this problem, some prior art, for example, Korean Patent Application Laid-Open No. 2001-106481, exposes the outer surface of the metal foil in the laminated sheet constituting the battery case to form an exposed portion, and the exposed portion and A battery inspection method is disclosed which compares a voltage between an electrode lead and a voltage between a positive electrode lead and a negative electrode lead. However, according to the above technique, damage to the battery may occur in the process of forming an exposed portion by partially exposing the outer surface of the metal foil, repeatability for measuring insulation resistance is not guaranteed, and accurate measurement is difficult. .

As another method, Japanese Patent Application Laid-Open No. 2006-147393 or the like discloses a battery having a structure in which an electrode assembly is incorporated in an outer casing on a laminate film having a three-layer structure of a heat sealable resin layer / metal foil layer / surface resin layer. The present invention discloses a method for inspecting a laminated battery, wherein a current flows between an electrode lead and the metal foil layer, and the sealability of the outer case is inspected from the amount of change in voltage. The above technique solves the problem that the appearance of the battery is damaged during the insulation resistance measurement process, but merely suggests a conventional measurement method for measuring the insulation resistance of the battery, and a specific measurement device for measuring insulation resistance that guarantees repeatable repeatability. The technology for does not disclose.

Therefore, there is a high need for a technique related to an insulation resistance measurement in which reproducibility is repeated for a plurality of test specimens, and a measuring device capable of easily performing continuous insulation resistance measurement in various types of test specimens.

The present invention aims to solve the problems of the prior art as described above and the technical problems that have been requested from the past.

An object of the present invention is to accurately measure a reproducible repeatability of a plurality of test specimens without disassembling the test specimen for measuring the insulation resistance or constructing a complicated circuit for connecting the resistance meter and the control device. It is possible to provide a fixing device for measuring insulation resistance.

In order to achieve the above object, a fixing device for measuring insulation resistance according to the present invention includes a metal layer and a battery in a structure in which an electrode assembly is attached to a battery case of a laminate sheet including a metal layer and a resin layer and then sealed by heat fusion. A device for fixing a battery to measure the resistance ("insulation resistance") of the electrode terminal,

A base plate on which a battery is mounted;

In the state where the battery is mounted on the base plate, a connection part ("metal layer connection part") contacting the end of the outer circumferential surface of the heat-sealing sealing part of the battery and a connection part ("probe connection part") to which a measurement probe of a predetermined resistance meter is contacted A lower jig, the lower jig being fixed to one side of the base plate; And

An upper jig for detachably fixing the heat-sealing sealing part of the battery together with the lower jig while the battery is mounted on the base plate;

It relates to a fixing device for measuring insulation resistance comprising a.

Therefore, the fixing device for measuring insulation resistance according to the present invention can measure the insulation resistance by easily connecting to the metal layer of the battery using the lower jig and the upper jig while the battery is mounted on the base plate. The advantage is that accurate measurements can be made with reproducible repeatability over a large number of test specimens without having to disassemble the test specimen to make a measurement or construct a complicated circuit for connecting a resistance meter and a control device.

In a general pouch type secondary battery, the aluminum laminate sheet used as a cell case is composed of an inner sealant layer (inner resin layer) / aluminum barrier layer (metal layer) / outer resin layer, and an outer peripheral surface end (cut out) during cutting into the pouch case. The aluminum blocking layer, which is a metal layer, is exposed to the outside. The metal layer is kept insulated from the electrode terminal by the inner sealant layer, and the resistance between the metal layer and the electrode terminal is expressed as "insulation resistance".

As described above, the fixing device for measuring insulation resistance according to the present invention includes a base plate and an upper / lower jig, and the heat-sealing sealing part of the battery is mounted on the lower base jig while the battery is mounted on the base plate. And the structure fixed between the upper jig. Based on this structure, the resistance between the electrode and the metal layer exposed to the outside of the outer peripheral surface end of the case in the fixed state of the battery is measured.

Therefore, the metal layer connection portion is configured to be in contact with the outer peripheral surface end of the at least one side sealing portion of the battery, preferably a step is formed so as to increase the accuracy of the battery and the adhesion of the outer peripheral surface end of the sealing portion of the battery. Can be. More preferably, the stepped structure may be a continuous stepped structure so as to be in contact with some of the outer peripheral surface end of the one side sealing portion of the battery and the outer peripheral surface end of the upper or lower surface sealing portion.

It is fixed on the base plate in a state where the heat-sealing sealing part of the battery is mounted on the lower jig, and has a structure connected to the resistance measuring probe. In one preferred example, the lower jig may have a structure in which one end thereof is bent to the side of the base plate and a probe connection part is formed at such side bent portion. For example, the probe connecting portion may have a structure formed in the form of a connecting groove.

When the heat-sealing sealing part of the battery is mounted on the lower jig, the upper jig is positioned on the upper surface of the heat-sealing sealing part. Preferably, the upper / lower jig is fixed through a predetermined detachable fastening member.

Therefore, at least one through groove is formed in the upper jig, and a fastening groove corresponding to the through groove is formed in the lower jig, and the upper part is formed on the upper surface of the heat-sealing sealing part of the battery while the battery is mounted on the base plate. After positioning the jig, a predetermined removable fastening member may be inserted into and fixed to the through groove and the fastening groove.

Preferably, a screw thread is formed on an inner surface of the fastening groove, and the detachable fastening member may have a structure having a screw thread formed on an outer surface thereof. For example, the removable fastening member may include a handle-type head and a main body having a screw thread formed on an outer surface thereof, and may have a structure in which the main body is coupled to the fastening groove of the lower jig while being inserted into the compression spring.

In one preferred example, one side of the base plate corresponding to the lower jig is provided with a seesaw-type fixed close contact lock, the upper jig may be mounted on one end of the fixed contact lock portion.

The present invention also provides an insulation resistance measuring system comprising a fixing device for measuring the insulation resistance and a resistance meter for measuring the insulation resistance of the battery through the fixing device in a state where the battery is placed in the fixing device.

In addition, the present invention provides a method for measuring the insulation resistance of the battery using the insulation resistance measurement system, in one specific example, by placing the battery on the fixing device for measuring the insulation resistance, The insulation resistance of a battery can be measured by connecting 1 probe to the electrode terminal of a battery, and connecting a 2nd probe to the probe connection part of the fixing apparatus for insulation resistance measurement. Therefore, the desired insulation resistance measurement can be easily performed by a simple operation.

Hereinafter, although described with reference to the drawings according to an embodiment of the present invention, this is for easier understanding of the present invention, the scope of the present invention is not limited thereto.

1 is a perspective view schematically showing a typical representative pouch-type battery.

Referring to FIG. 1, the pouch-type battery 10 has a structure in which two electrode leads 11 and 12 protrude from each other to protrude from an upper end and a lower end of the electrode assembly 13. The battery case 14 is composed of two unit members of an upper case and a lower case, and both sides 14a which are mutually contacting portions with an electrode assembly (not shown) mounted on an accommodating portion formed on an inner surface thereof. The battery 10 is manufactured by attaching the upper and lower ends 14b and 14c, respectively.

The battery case 14 has a laminate structure of an inner resin layer (inner sealant layer) / metal layer / outer resin layer, and applies heat and pressure to both side surfaces 14a and upper and lower ends 14b and 14c which are in contact with each other. Can be attached by mutual fusion, and in some cases, it can also be attached using an adhesive agent. Both side surfaces 14a are in direct contact with the same inner resin layer of the upper and lower battery cases 14, thereby enabling uniform sealing by melting. On the other hand, since the electrode leads 11 and 12 protrude from the upper end 14b and the lower end 14c, the sealing properties are improved in consideration of the thickness of the electrode leads 11 and 12 and the heterogeneity with the material of the exterior member 14. Heat-sealing is carried out in the state which interposed the film-like sealing member 16 between the electrode leads 11 and 12 so that it may be made.

2 and 3 schematically show a front view and a side view of a fixing device for measuring insulation resistance according to an embodiment of the present invention, respectively.

First, referring to Figures 2 and 3 together, the fixing device for measuring insulation resistance according to the present invention is fixed to one side of the base plate 100, the base plate 100 on which the secondary battery can be mounted as a test specimen. The lower jig 200, the upper jig 300, and the electrode terminal fixing plate 110 are configured to be included.

In a state in which a secondary battery (not shown) is mounted on the base plate 100, the heat-sealing sealing part of the battery is positioned between the lower jig 200 and the upper jig 300, and the removable fastening member 400 is disposed. It is fixed through. In addition, one electrode terminal of the battery is fixed through the electrode terminal fixing plate 110.

The lower jig 200 includes a connection part in contact with an end of the outer circumferential surface of the heat-sealing sealing part of the battery and a connection part in contact with a measurement probe of the resistance meter, and an upper jig through a fastening groove 210 having a screw thread formed on an inner surface thereof. It is coupled to the 300, one end is fixed to the side of the base plate 100 in a bent shape.

The upper jig 300 has a shape corresponding to the lower jig 200, and a through hole 310 for coupling with the lower jig 200 is formed, and the battery is mounted on the base plate 100. After positioning the upper jig 200 on the upper surface of the heat sealing portion of the battery, the removable fastening member 400 is inserted into the through groove 310 and the fastening groove 210 to be fixed.

The removable fastening member 400 is shown in more detail in FIG. 4, and the coupling structure between the lower jig 200 and the upper jig 300 will be described in more detail with reference to FIG. 5.

4 is a front view of a removable fastening member used in the fixing device for measuring insulation resistance of FIG. 2.

Referring to FIG. 4, the detachable fastening member 400 includes a handle head 410 and a main body 420 having a screw thread formed on an outer surface thereof, and a lower jig in the state where the compression spring 430 is inserted into the main body. It is coupled to the through hole 310 of the fastening groove 210 and the upper jig 300 of the 200. The screw thread formed on the outer surface of the main body 420 of the detachable fastening member 400 has a shape corresponding to the screw thread formed on the inner surface of the fastening groove 210 of the lower jig 200, and is connected to the male and female threads. To be fixed.

FIG. 5 is a partial cross-sectional view schematically showing a coupling structure of the upper and lower jigs in the fixing device for measuring insulation resistance of FIG. 2.

Referring to FIG. 5, as a test specimen, the secondary battery 500 is a pouch type battery of an aluminum laminate sheet, and the aluminum laminate sheet is formed of an inner sealant layer / aluminum barrier layer / outer resin layer and has an outer peripheral surface end (cutout surface) 520. The aluminum blocking layer 510 is made of a structure that is exposed to the outside.

The heat-sealing sealing portion of the secondary battery 500 is located between the lower jig 200 and the upper jig 300, and the lower jig 200 may contact the outer peripheral surface end portion 520 of one side sealing portion of the battery 500. It is made of a stepped structure, and on one side of the other side is formed a connection groove (not shown) for connecting with the measuring probe 600 of the resistance meter. In addition, the upper jig 300 is coupled to the lower jig 200 through the removable fastening member 400 after being positioned on the upper surface of the heat-sealing sealing part of the battery 500.

6 is a front photograph of a fixing device for measuring insulation resistance according to another embodiment of the present invention.

Referring to FIG. 6, a fixing device for measuring insulation resistance according to the present invention includes a base plate on which a secondary battery may be mounted, an upper / lower jig coupled to a bent shape on one side of the base plate, and an upper / lower jig. It is composed of a fixed tight lock portion for coupling on the base plate.

The base plate is made of wood as an insulating material, and the upper and lower jigs are bent in a 'b' shape and made of copper material. Fixed tightly locking portion will be described in more detail with reference to Figure 7 for a removable fastening member.

FIG. 7 is a partially enlarged view of the coupling structure between the upper / lower jig and the fixed close lock for the fixing device of FIG. 6.

Referring to FIG. 7, the upper and lower jigs made of copper are mounted on a base plate made of wood, and are formed to be coupled to each other by a fixed close contact part. In the state where the battery is mounted on the base plate, the heat-sealing sealing part of the battery is positioned between the upper and lower jig, and then the fixed adhesion lock part is lowered to fix it. In addition, it is connected to the probe of the resistance meter through a connection groove formed on one side of the lower jig.

8 is a front photograph of a state in which a secondary battery is mounted on the fixing device for measuring insulation resistance of FIG. 6.

In the fixing device for measuring insulation resistance according to the present invention, as a test specimen, the secondary battery preferably has both electrode terminals formed in the vertical direction of the battery cell, but as shown in FIG. 8, the electrode terminals are formed in the same direction. It can be confirmed that the insulation resistance can be measured even for the secondary battery.

Referring to FIG. 8, one side of the heat-sealing sealing part is positioned between the upper and lower jigs in a state in which the secondary battery is mounted on the base plate, and is configured to be fixed by a fixed close lock part. In addition, in order to prevent the occurrence of a short when measuring the insulation resistance, it is shown by way of example wrapped around the one electrode terminal with an insulating tape.

FIG. 9 illustrates a method of measuring insulation resistance of a secondary battery by using an insulation resistance measurement system according to an exemplary embodiment of the present invention.

Referring to FIG. 9, the battery is placed on a fixing device for measuring insulation resistance, and the insulation resistance is measured by connecting a resistance meter. The first probe of the resistance meter is connected to the electrode terminal of the battery, and the second probe is connected to a connection groove formed on one side of the lower jig of the fixing device for measuring insulation resistance to measure the insulation resistance of the battery.

Although described above with reference to the drawings according to an embodiment of the present invention, those of ordinary skill in the art will be able to perform various applications and modifications within the scope of the present invention based on the above contents.

As described above, the fixing device for measuring insulation resistance according to the present invention does not go through the process of disassembling the test specimen or configuring a complicated circuit for connecting the resistance meter and the control device to measure the insulation resistance. This has the effect of allowing accurate measurements to ensure repeatability of the test specimens.

Claims (11)

In a battery of a structure in which an electrode assembly is attached to a battery case of a laminate sheet including a metal layer and a resin layer, and then sealed by heat fusion, the cell is fixed to measure the resistance ("insulation resistance") of the metal layer and the electrode terminal. As a device, A base plate on which a battery is mounted; The connection part ("metal layer connection part") which contacts the outer peripheral surface end part of the heat-sealing sealing part of a battery in the state in which a battery is mounted on the said base plate, and the connection part ("probe connection part") which a measurement probe part of a predetermined resistance meter contacts. A lower jig, the lower jig being fixed to one side of the base plate; And An upper jig for detachably fixing the heat-sealing sealing part of the battery together with the lower jig while the battery is mounted on the base plate; Fixing device for measuring insulation resistance comprising a. The fixing device for measuring insulation resistance according to claim 1, wherein the metal layer connection portion has a stepped structure so as to be in contact with an end portion of an outer circumferential surface of at least one side sealing portion of the battery. 3. The method of claim 2, wherein the stepped structure is formed of a continuous stepped structure so as to be in contact with a portion of the outer peripheral surface end of one side sealing portion of the battery and the outer peripheral surface end of the upper or lower surface sealing portion together. Device. The fixing device for measuring insulation resistance according to claim 1, wherein the lower jig has one end thereof bent toward the side of the base plate, and the probe connection portion is formed at the side bent portion. The fixing device for measuring insulation resistance according to claim 4, wherein the probe connection portion is formed in the form of a connection groove. The method of claim 1, wherein at least one through groove is formed in the upper jig, a fastening groove corresponding to the through groove is formed in the lower jig, and the battery is heat-sealed in a state where the battery is mounted on the base plate. Positioning the upper jig on the upper surface of the sealing portion, the predetermined resistance for measuring insulation resistance characterized in that the insertion and fixing the removable fastening member in the through groove and the fastening groove. The fixing device for measuring insulation resistance according to claim 6, wherein a screw wire is formed on an inner surface of the fastening groove, and the detachable fastening member has a structure in which a screw wire is formed on an outer surface thereof. The method of claim 7, wherein the removable fastening member consists of a handle-type head and a main body having a screw thread formed on the outer surface, the insulating member characterized in that the coupling to the coupling groove of the lower jig in the state inserted into the compression spring. Fixture for resistance measurement. According to claim 1, wherein the base plate corresponding to the lower jig is provided with a seesaw-type fixed close contact lock portion, the upper jig is mounted on one end of the fixed close contact lock portion for insulation resistance measurement Fixture. 10. The apparatus for measuring insulation resistance according to claim 1, and a resistance measuring instrument for measuring insulation resistance of the battery through the fixing apparatus in a state where the battery is placed in the fixing apparatus. Insulation resistance measuring system. A method for measuring the insulation resistance of a battery using the insulation resistance measuring system according to claim 10, comprising placing a battery on the fixing device for measuring insulation resistance, connecting the first probe of the resistance meter to the electrode terminal of the battery, and And measuring the insulation resistance of the battery by connecting the second probe to the probe connection portion of the fixing device for measuring insulation resistance.

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