KR20130128030A - Jig for measurement of voltage in 3-electrode system - Google Patents

Abstract

The present invention relates to a voltage measurement jig in a three-electrode system to accurately measure a potential difference between the anode and cathode of a jelly-roll. The voltage measurement jig in the three-electrode system comprises an electrically insulating mounting part in which the jelly-roll is inserted; an anode measurement part connected to an anode lead of the jelly-roll, measuring the anode voltage of the jelly-roll, placed on the upper side of the mounting part, and electrically connected to a voltage measurement device; a cathode management part connected to a cathode lead of the jelly-roll, measuring the cathode voltage of the jelly-roll, placed at the lower side of the mounting part, and electrically connected to the voltage device; and a reference electrode measurement part electrically connected to a reference electrode, measuring the voltage of the reference electrode, electrically connected to the voltage measurement device, and placed at the lower side or the upper side of the mounting part.

Description

Jig for Measurement of Voltage in 3-Electrode System

The present invention is a three-electrode voltage measuring jig for accurately measuring the potential difference between the positive electrode and the negative electrode of the jelly-roll, the electrical insulating mounting portion is inserted into the jelly-roll; An anode measuring unit connected to the anode lead of the jelly roll to measure the anode voltage of the jelly roll and positioned at an upper end of the mounting unit and electrically connected to the voltage meter and positioned at an upper end of one side of the mounting unit; A negative electrode measuring unit connected to the negative electrode lead of the jelly-roll to measure a negative electrode voltage of the jelly-roll, and connected to the lower end of the mounting unit and electrically connected to the voltage measuring unit, And

It is connected to the reference electrode to measure the voltage of the reference electrode and is electrically connected to the voltage meter and is provided with a three-electrode voltage measuring jig comprising a; consisting of a reference electrode measuring unit located on the other top or bottom of the mounting portion.

Generally, the electrode potential of a battery is measured for the purpose of developing a new battery, checking the performance of the manufactured battery, and the like. For measuring the electrode potential, a three-electrode-based electrode potential measuring method including a reference electrode, a working electrode, and a potential electrode is mainly used.

The reference electrode is an electrode used to make a battery circuit for measuring electrode potential in combination with the electrode for measuring the potential of an electrode constituting a battery or an electrode in which electrolysis is occurring. It becomes the standard of.

Such a reference electrode should follow the Nernst equilibrium equation as a reversible electrode potential (electrode in reversible state), have a non-polarization characteristic that always maintains a constant potential value, have a small potential difference between liquids, and change potentials even when temperature changes The change shall be small and the requirements such as showing a constant potential value at a constant temperature shall be met.

In this regard, in the field of secondary batteries, which are growing rapidly in recent years, the measurement of electrode potential has been performed for the development of new batteries and the improvement of performance of existing batteries. Generally, the conventional method is used as it is for the electrode potential measurement of such a secondary battery. For example, when measuring the performance of a newly developed positive electrode active material, the electrode potential is measured by installing an anode containing an electrolyte solution in a container and coated with a positive electrode active material as a working electrode, a reference electrode, and a negative electrode as an auxiliary electrode. However, this method has the following problems.

First, there is a problem that results that do not match the electrode potential in an actual cell can be obtained. In general, a secondary battery includes an electrode assembly having a specific structure consisting of a positive electrode, a separator, and a negative electrode in a sealed case (can, pouch, etc.) in which an electrolyte is impregnated, and various other battery components are installed. Therefore, since the internal environment of the actual secondary battery shows a lot of differences from the conditions for the experiment, it exhibits a difference with the electrode potential in the experiment conditions performed under a very simplified condition.

Second, there is a problem in that the potential change of the positive electrode and the negative electrode during actual charge and discharge cannot be measured at the same time.

Third, there is a problem in that the manufactured battery must be completely disassembled in order to measure the electrode potential. In the case of performing periodic tests for the purpose of evaluating the quality of a mass produced battery, the complete disassembly of the battery may be time consuming and result in a change of the actual condition of the battery as described above, so that accurate results may be difficult to obtain.

Fourth, there is a problem that the measurement of the electrode potential is not easy in the state in which various experimental conditions for measuring various physical properties required for the battery are set. The secondary battery must satisfy various requirements such as high temperature safety and needle penetrating safety. It is required to measure the electrode potential under experimental conditions to confirm that the requirements are met.

On the other hand, in order to measure the potential of the electrode in the solution it is necessary to measure the potential difference in the equilibrium state that can almost ignore the actual current between the working electrode (reference electrode) and the reference electrode (reference electrode).

However, when an external voltage is applied between the electrodes, a voltage drop occurs due to the resistance between the electrodes, so that the reference electrode potential is out of equilibrium, thereby causing a lot of errors.

In addition, for evaluating the three-electrode-based electrode potential, a method of immersing the jelly-roll in the solution of the beaker or the method of dissolving the jelly-roll in a bi-cell type is mainly used when evaluating the battery cell. Doing.

However, the measuring method using the beaker or the bicell in the above method has a problem that it is not easy to manufacture and takes a lot of time.

Therefore, since the conventional method for measuring the three-electrode-based electrode potential in relation to the secondary battery has a lot of problems, the need for a technology that can solve this problem is very high.

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

Specifically, it is an object of the present invention to measure the electrode potential of a jelly-roll by a three-electrode measurement method, which can be used to accurately measure the electrode potential at actual operating conditions of a battery by simply mounting without disassembling the jelly-roll. It is to provide a three-electrode voltage measuring jig.

The three-electrode voltage measuring jig according to the present invention for achieving the above object is a three-electrode voltage measuring jig for accurately measuring the potential difference between the anode and the cathode of the jelly-roll,

An electrically insulating mounting portion into which the jelly-roll is inserted;

An anode measuring unit connected to the anode lead of the jelly roll to measure the anode voltage of the jelly roll and positioned at an upper end of the mounting unit and electrically connected to the voltage meter and positioned at an upper end of one side of the mounting unit;

A negative electrode measuring unit connected to the negative electrode lead of the jelly-roll to measure a negative electrode voltage of the jelly-roll, and connected to the lower end of the mounting unit and electrically connected to the voltage measuring unit, And

A reference electrode measurement unit electrically connected to the reference electrode to measure a voltage of the reference electrode, electrically connected to a voltage meter, and positioned at an upper or lower end of the other side of the mounting unit;

Consists of a structure that consists of.

Therefore, since the three-electrode voltage measuring jig according to the present invention is composed of a mounting part, a positive electrode measuring part, a negative electrode measuring part, and a reference electrode measuring part, the positive electrode and the negative electrode are maintained while the jelly-roll state is maintained without structural change of the jelly-roll. The potential change of can be observed in real time.

In addition, the three-electrode voltage measuring jig has the advantage that can be used universally without the need to produce a specific jig for each jelly-roll.

In addition, the three-electrode voltage measuring jig according to the present invention can perform the same charge and discharge evaluation of the jelly-roll simply by inserting the jelly-roll, and further observe the potential change of the positive electrode and the negative electrode, respectively.

In addition, the three-electrode voltage measuring jig of the above structure can observe the charge and discharge profile in more detail, thereby obtaining a lot of information.

In one preferred example, the positive electrode measuring part includes a first positive electrode plate including a slit for inserting a jelly-roll positive electrode lead and an extension protruding outward for connection with a voltage meter, and an upper end of the first positive electrode plate. It may be composed of a second anode plate mounted on.

Therefore, since the positive electrode measuring part is composed of a first positive electrode plate including a slit and a second positive electrode plate, the positive electrode lead inserted into the slit of the first positive electrode plate does not require welding separately from the first positive electrode plate. .

As an example of the above structure, an O-ring for sealing the positive lead may be formed on the upper end of the first positive electrode plate.

Therefore, since the first positive electrode plate is in close contact with the second positive electrode plate and can prevent the positive electrode lead from contacting foreign matters, it is possible to accurately measure the current or voltage of the positive electrode lead.

As another example of the structure, fasteners for coupling to each other are formed at at least one of four corners of the first and second anode plates, so that the first and second anode plates Bonding can be easily achieved.

As a specific example, the coupling of the first positive electrode plate and the second positive electrode plate may be accomplished by inserting a bolt into the fastener of the first positive electrode plate and the second positive electrode plate.

As another example, the negative electrode measuring unit may include a first negative electrode plate including a first slit for inserting a negative lead of a jelly-roll and an extension protruding outward to connect with a voltage meter; And a second negative electrode plate mounted at a lower end of the first negative electrode plate.

Accordingly, the specific structure as described above allows the negative electrode lead to be mounted between the first negative electrode plate and the second negative electrode plate without additional welding with the plates.

As an example of the structure, an o-ring for sealing the negative electrode lead is formed on the lower surface of the first negative electrode plate, so that the first negative electrode plate is in close contact with the second negative electrode plate and the end of the negative electrode lead is external foreign matter. Contact with the body can be prevented.

As another example of the structure, a fastener for coupling to each other is formed at one or more of the four corners of the first negative plate and the second negative plate, so that the first negative plate and the second negative plate Bonding can be easily achieved.

The reference electrode measuring unit may include a first reference electrode plate including a through hole for inserting a conductive wire electrically connected to the reference electrode and an extension part protruding outwardly to connect with the voltage meter, and the first reference electrode plate. It may be made of a second reference electrode plate mounted on the top.

Therefore, since the reference electrode measuring unit includes the first reference electrode plate and the second reference electrode plate including the through hole as described above, the conductive wire electrically connected to the first reference electrode may be the first reference electrode plate or the second reference electrode. No welding is required with the plate.

As an example of the structure, an o-ring for sealing the reference electrode lead is formed at an upper end of the first reference electrode plate, so that the first reference electrode plate is in close contact with the second reference electrode plate and By preventing the end of the electrically connected wire from contacting the foreign matter, it is possible to accurately detect the current or voltage of the reference electrode.

As another example of the structure, a fastener for coupling to each other is formed at one or more of four corners of the first reference electrode plate and the second reference electrode plate, so that the first reference electrode plate and the second reference electrode plate are respectively formed. Coupling of the reference electrode plate can be easily achieved.

The mounting portion,

An electrically insulating body mounted in a sealed state in which a jelly roll is mounted,

An electrically insulating top plate located on top of the body, and

An electrically insulating lower plate located at the bottom of the body;

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Therefore, since the mounting portion is made of electrically insulating materials, it is possible to prevent the current flowing through the jelly-roll and the reference electrode from leaking to the outside of the mounting portion.

As a specific example, the upper plate has a structure including a first through hole penetrating in a shape corresponding to the top surface of the jelly-roll, and a second through hole penetrating in a shape corresponding to the lead of the reference electrode. In this case, the anode lead may be inserted into the first through hole and the conductive wire of the reference electrode may be inserted into the second through hole and then protrude upward from the upper plate.

The lower plate may have a structure including a third through hole penetrating in a shape corresponding to the lower surface of the jelly-roll, and an indentation groove indented in a shape corresponding to the conductive line of the reference electrode and the reference electrode.

Therefore, the negative electrode lead is inserted into the third through hole and protrudes to the lower portion of the lower plate, and the reference electrode and the conductive wire of the reference electrode may be mounted in the indentation groove to be insulated from the negative electrode measuring unit.

On the other hand, the positive electrode measuring unit is not particularly limited as long as it is a material capable of easily measuring the current or voltage flowing through the anode of the jelly-roll, it may be preferably made of aluminum.

The cathode measuring unit and the reference electrode measuring unit are not particularly limited as long as the material can easily measure the current or voltage flowing through the cathode and the reference electrode of the jelly-roll, and preferably, may be made of copper.

The mounting portion is not particularly limited as long as it is an insulating material, and for example, may be made of polycarbonate.

The reference electrode material is not particularly limited as long as it is a reference electrode material for measuring a three-electrode electrode potential, and may be, for example, lithium metal, platinum, gold, silver, or other metals having known reduction potentials. Especially, lithium metal with a small change of the equilibrium value of electric potential with a change of an electric current is especially preferable.

The present invention also provides a three-electrode voltage measuring device.

Specifically, the three-electrode voltage measuring device,

The three-electrode voltage measuring jig; And a voltage measurer electrically connected to the positive electrode measurer, the negative electrode measurer, and the reference electrode measurer to measure the current and / or voltage of the jelly-roll.

Therefore, the apparatus for measuring the three-electrode system voltage according to the present invention can observe the potential change of the anode and the cathode in real time while maintaining the jelly-roll state without changing the structure of the jelly-roll.

The present invention also provides a cylindrical lithium secondary battery comprising the jelly-roll.

The cylindrical secondary battery may be used as a power source for notebooks, mobile phones, portable computers, smart phones, smart pads, netbooks, LEVs (Light Electronic Vehicles), electric vehicles, hybrid electric vehicles, plug-in hybrid electric vehicles, and power storage devices. have.

As described above, the three-electrode voltage measuring jig of the present invention is easy to manufacture due to its simple structure, it is possible to quickly and accurately measure the electrode potential of the actual state of the secondary battery, and can be measured under various experimental conditions.

1 is a photograph of a three-electrode voltage measuring jig according to one embodiment of the present invention;
2 is a schematic plan view of the first positive electrode plate;
3 is a schematic plan view of a second positive electrode plate;
4 is a schematic plan view of the first reference electrode plate;
5 is a schematic plan view of a second reference electrode plate;
6 is a schematic plan view of the top plate;
7 is a perspective view of the mounting portion;
8 is a vertical cross-sectional schematic diagram of FIG. 1;
9 is a schematic plan view of the lower plate;
10 is a schematic plan view of the first negative electrode plate;
11 is a schematic plan view of the second negative electrode plate.

Hereinafter, the content of the present invention will be described with reference to the drawings, but the scope of the present invention is not limited thereto.

1 is a photograph of a three-electrode voltage measuring jig according to an embodiment of the present invention.

Referring to FIG. 1, the three-electrode voltage measuring jig 100 is used to accurately measure the potential difference between the positive electrode and the negative electrode of the jelly-roll 50.

Specifically, the three-electrode voltage measuring jig 100 is connected to the electrically insulating mounting portion 80 into which the jelly roll 50 is inserted and the anode lead of the jelly roll 50 to measure the anode voltage of the jelly roll. And an anode measuring unit located at the upper end of the mounting unit and electrically connected to a voltage meter (not shown), and connected to the cathode lead of the jelly roll 50, which is located at the upper left of the mounting unit 80. A negative electrode measuring unit, which is connected to the lower end of the mounting unit and is electrically connected to the voltage meter, and is connected to the negative electrode measuring unit located at the lower end of the mounting unit 80, and electrically connected to the reference electrode 90 to measure the voltage of the reference electrode. And a reference electrode measurer located at the top right of the mounting portion 80 and electrically connected to the voltage meter.

FIG. 2 is a schematic plan view of the first positive electrode plate, and FIG. 3 is a schematic plan view of the second positive electrode plate.

1, the anodal measurement unit includes a slit 14 for inserting a positive electrode lead of the jelly-roll 50 and includes an outwardly extending extension 12 for connection with a voltage meter And a second positive electrode plate 20 mounted on the top of the first positive electrode plate 10.

In addition, an O-ring 16 for sealing an anode lead is formed and mounted at an upper end of the first anode plate 10, and four corners of the first anode plate 10 and the second anode plate 20 are mounted. There are fasteners for coupling to each other.

4 is a schematic plan view of the first reference electrode plate, and FIG. 5 is a plan schematic view of the second reference electrode plate.

Referring to these figures in conjunction with FIG. 1, the reference electrode measurement unit includes a through hole 38 for inserting a conductor 92 electrically connected to the reference electrode 90 and extends outwardly for connection with a voltage meter. The first reference electrode plate 30 including the portion 31, and the second reference electrode plate 40 is mounted on the upper end of the first reference electrode plate 30.

In addition, an O-ring 38 for sealing the reference electrode lead is mounted on an upper end of the first reference electrode plate 30, and the first reference electrode plate 30 and the second reference electrode plate 40 Fasteners 32, 34 and 44 are formed at the four corners for coupling to each other.

6 is a schematic plan view of the upper plate, and FIG. 7 is a perspective view schematically illustrating the mounting portion. 8 shows a vertical cross-sectional schematic diagram of FIG. 1, and FIG. 9 shows a flat schematic diagram of a lower plate.

Referring to these drawings in conjunction with FIG. 1, the mounting portion 80 is an electrically insulating main body 84 mounted in a sealed state in which a jelly roll 50 is mounted, and an electrical insulating property located on an upper end of the main body 84. Top plate 82, and an electrically insulating bottom plate 86 located at the lower end of the main body 84.

The upper plate 82 is penetrated in a shape corresponding to the first through hole 824 penetrating in a shape corresponding to the top surface of the jelly-roll 50, and a conductive line 92 connected to the reference electrode 90. A second through hole 822 is included.

The lower plate 86 is indented in a shape corresponding to the third through hole 866 penetrating in a shape corresponding to the bottom surface of the jelly-roll 50 and the reference electrode 90 and the lead 92 of the reference electrode. It includes a recessed groove 864 that is.

In addition, the main body 84 is provided with a jelly-roll inserting hole 842 for inserting the jelly-roll 50 from the top and a reference electrode inserting hole 846 for inserting the lead of the reference electrode. 50) and the reference electrode are inserted into the main body, and then electrolyte (not shown) is injected into the main body.

FIG. 10 is a schematic plan view of the first negative electrode plate, and FIG. 11 is a schematic plan view of the second negative electrode plate.

Referring to these figures, the negative electrode measuring part includes a first slit 61 for inserting the negative lead of the jelly-roll 50 and an extension 64 which protrudes outward to connect with the voltage meter. It consists of a first negative electrode plate 60 and a second negative electrode plate 70 mounted on the lower end of the first negative electrode plate 60.

In addition, the lower surface of the first negative electrode plate 60 is formed with an o-ring 66 for sealing the negative electrode lead, and the four corners of the first negative electrode plate 60 and the second negative electrode plate 70 are mutually Six fasteners 62 and 72 are formed for coupling.

While some embodiments of the present invention have been described above with reference to the drawings, those skilled in the art to which the present invention pertains will be able to perform various applications and modifications within the scope of the present invention based on the above contents. .

Claims (19)

A three-electrode voltage measuring jig for accurately measuring the potential difference between the anode and the cathode of a jelly-roll,
An electrically insulating mounting portion into which the jelly-roll is inserted;
An anode measuring unit connected to the anode lead of the jelly roll to measure the anode voltage of the jelly roll and positioned at an upper end of the mounting unit and electrically connected to the voltage meter and positioned at an upper end of one side of the mounting unit;
A negative electrode measuring part connected to the negative lead of the jelly-roll to measure the negative voltage of the jelly-roll and positioned at the bottom of the mounting part and connected to the voltage meter and electrically connected to the voltage meter; And
A reference electrode measurement unit electrically connected to the reference electrode to measure the voltage of the reference electrode, electrically connected to the voltage meter, and positioned at the upper or lower side of the other side of the mounting unit;
Three-electrode voltage measurement jig comprising a. The first positive electrode plate of claim 1, wherein the positive electrode measuring part includes a slit for inserting a jelly-roll positive electrode lead and includes an extension protruding outwardly for connection with a voltage meter, and an upper end of the first positive electrode plate. The three-electrode electrode-based voltage measuring jig, characterized in that consisting of a second positive electrode plate mounted to. 3. The three-electrode voltage measuring jig according to claim 2, wherein an o-ring for sealing the positive lead is formed at an upper end of the first positive electrode plate. 3. The three-electrode voltage measuring jig according to claim 2, wherein fasteners for coupling to each other are formed at at least one of four corners of the first and second anode plates. The negative electrode measuring device of claim 1, wherein the negative electrode measuring part comprises: a first negative electrode plate including a first slit for inserting a negative lead of a jelly-roll and an extension protruding outward to connect with a voltage meter; And a second negative electrode plate mounted at a lower end of the first negative electrode plate. 6. The three-electrode voltage measuring jig according to claim 5, wherein an o-ring for sealing a cathode lead is formed on a lower surface of the first cathode plate. 6. The three-electrode voltage measuring jig according to claim 5, wherein fasteners for coupling to each other are formed at at least one of four corners of the first and second negative electrode plates. The first reference electrode plate of claim 1, wherein the reference electrode measuring unit includes a through hole for inserting a conductive wire electrically connected to the reference electrode and includes an extension protruding outwardly to connect with the voltage meter. A three-electrode voltage measuring jig comprising: a second reference electrode plate mounted on an upper end of the reference electrode plate. 9. The three-electrode voltage measuring jig according to claim 8, wherein an o-ring for sealing the reference electrode lead is formed on the upper end of the first reference electrode plate. The three-electrode voltage measuring jig of claim 8, wherein fasteners for coupling to each other are formed at at least one of four corners of the first reference electrode plate and the second reference electrode plate. The method of claim 1, wherein the mounting portion,
An electrically insulating body mounted in a sealed state in which a jelly roll is mounted,
An electrically insulating top plate located on top of the body, and
An electrically insulating lower plate located at the bottom of the body;
Three-electrode voltage measurement jig, characterized in that consisting of. The method of claim 11, wherein the top plate comprises a first through hole penetrating in a shape corresponding to the top surface of the jelly-roll, and a second through hole penetrating in a shape corresponding to the conductive wire connected to the reference electrode Three-electrode voltage measuring jig, characterized in that. The method of claim 11, wherein the lower plate comprises a third through hole penetrating in a shape corresponding to the lower surface of the jelly-roll, and an indentation groove indented in a shape corresponding to the conductive wire connected to the reference electrode and the reference electrode; Three-electrode voltage measuring jig, characterized in that. The three-electrode voltage measuring jig according to claim 1, wherein the anode measuring part is made of aluminum. The three-electrode voltage measuring jig according to claim 1, wherein the cathode measuring part and the reference electrode measuring part are made of copper. The three-electrode voltage measuring jig according to claim 1, wherein the mounting part is made of polycarbonate. The three-electrode voltage measuring jig according to claim 1, wherein the reference electrode material is at least one selected from the group consisting of lithium metal, platinum, gold, silver, and other metals with known reduction potentials. A three-electrode voltage measuring jig according to claim 1; And
A voltage meter electrically connected to the positive electrode measuring unit, the negative electrode measuring unit, and the reference electrode measuring unit to measure the current and / or voltage of the jelly-roll;
Three-electrode voltage measurement device, characterized in that consisting of. Cylindrical lithium secondary battery comprising a jelly-roll according to claim 1.

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