KR20160072571A - Apparatus for analyzing gas in secondary electric cell and method of analyzing the gas - Google Patents

Abstract

According to the present invention, a gas analyzing device for a secondary battery comprises: a gas analyzing chamber configured to accommodate a secondary battery and form a sealed space; a charging/discharging unit configured to support the secondary battery, and connected to an electrode lead of the secondary battery to charge or discharge the secondary battery; a sensing unit configured to sense a pressure and a temperature of the gas analyzing chamber; and a temperature control unit configured to supply heat to an inside of the gas analyzing chamber, adjusting a thermal degree to sequentially increase a temperature of the gas analyzing chamber. As such, the gas analyzing device is able to prevent an explosion due to an increase in internal pressure of the gas analyzing chamber.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a gas analyzing apparatus for a secondary battery, and a gas analyzing method using the gas analyzing apparatus.

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a gas analyzing apparatus for a secondary battery and an analyzing method thereof, and more particularly, to an analyzing apparatus and an analyzing method capable of performing quantitative analysis, qualitative analysis, .

Secondary batteries having high electrical properties such as high energy density and high ease of application according to the product group are widely used not only in portable devices but also in electric vehicles (EVs) or hybrid vehicles (HVs) driven by electric driving sources Has been applied.

Such a secondary battery is not only a primary advantage that the use of fossil fuel can be drastically reduced, but also produces no by-products resulting from the use of energy, and thus is attracting attention as a new energy source for enhancing environmental friendliness and energy efficiency.

The secondary battery (cell) may be classified into various types including a can type battery in which internal elements are constituted by a hard case such as a metallic case or the like depending on the application form or structure. Illustratively, the pouch type secondary battery cell is shown in . Since the basic principle and the structure can be mutually corresponded, the pouch type secondary battery shown in Fig. 1 will be described as an exemplary form.

1, the secondary battery 10 includes a pouch case 20 and an electrode assembly 30 as a basic structure. The electrode assembly 30 is disposed between a positive electrode plate, a negative electrode plate, and a positive electrode plate and a negative electrode plate And a separator for electrically insulating the positive electrode plate and the negative electrode plate.

As shown in FIG. 1, the electrode assembly 30 includes a positive electrode tab 32 extending from the positive electrode plate and a negative electrode tab 34 extending from the negative electrode plate.

The positive electrode tab 32 and the negative electrode tab 34 are bonded to the respective electrode leads 36 and 38 by resistance welding, ultrasonic welding, laser welding, or the like after being converged in a predetermined direction. The electrode leads 36 and 38 having such a coupling structure function as an electrode of the secondary battery to electrically connect the secondary battery and an external application device or the like.

After the electrode assembly 30 is poured into the pouch case 20, an electrolyte is injected into the pouch case 20 and a post-treatment process such as a sealing process, an aging process, and a chemical process is performed to form a completed secondary battery cell. The pouch case 20 is divided into an upper case 21 and a lower case 22. The pouch case 20 may be referred to as a single cap or a double cap or the like depending on where the electrode assembly 30 is housed.

1, the positive electrode and the negative electrode lead may be formed on the same pouch case surface, and the electrode lead may be formed on the other surface of the pouch case according to the embodiment, An insulating tape 33 may be attached to the electrode leads 36 and 38 so as to improve the sealing efficiency of the portion overlapping the electrode lead when the upper and lower surfaces of the pouch case are thermally fused to the sealing process of the pouch case.

Meanwhile, the secondary battery having such a structure can generate gas by an electrochemical reaction of internal components, that is, an electrode, an active material, and an electrolyte, and the internal gas generated in this manner is generated by the electrochemical reaction of secondary water It is necessary to accurately and precisely analyze the performance of the secondary battery to improve the performance of the secondary battery, to optimize the structure of the secondary battery, to improve the charging / discharging efficiency by adjusting the composition of the active material and the electrolyte, and to minimize the side water. .

However, devices for analyzing the mass or components of objects to be inspected may be said to be generalized, but these devices have limitations or limitations in application such as being applied only to strict vacuum environments, There is a problem that it is difficult to be applied. Also, analysis of the components by the conventional device is performed only in an extremely limited range because the internal electrolytic solution of the secondary battery is leaked and the sample of the component inspection is contaminated. to be.

In addition, if the secondary battery is overcharged or abruptly changed in an electrical environment, electrolytic solution decomposition may occur in the anode, and precipitation of lithium metal may occur in the cathode. If such a phenomenon occurs, the performance of the secondary battery may deteriorate And the gas may be generated due to the heat generated by the chemical reaction.

At the same time, a solvent such as ethylene carbonate or propylene carbonate is used as the electrolyte solution. Such a solvent decomposes at high temperature to generate gas, and as a result of this pressure swelling phenomenon, which is a component phenomenon, Which can cause serious problems such as explosion.

In order to provide basic data for realizing a safer and more stable secondary battery by analyzing the accurate profile of changes in the composition, weight, etc. of the generated gas in the secondary battery according to environmental conditions such as temperature, charging, It is necessary to devise.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide an apparatus for analyzing a profile of a change in a component, a weight, etc. of a gas generated inside a secondary battery through a structure optimized for the characteristics of the secondary battery It has its purpose.

Other objects and advantages of the present invention will be described hereinafter and will be understood by the embodiments of the present invention. Further, the objects and advantages of the present invention can be realized by a combination of the constitution and the constitution shown in the claims.

According to the present invention, there is provided a gas analysis apparatus comprising: a gas analysis chamber in which a secondary battery is accommodated and a sealed space is formed; A charger supporting the secondary battery and connected to the electrode lead of the secondary battery to charge or discharge the secondary battery; A sensing unit sensing the pressure and temperature of the gas analysis chamber; And a temperature controller for supplying heat to the inside of the gas analysis chamber and sequentially increasing the temperature of the gas analysis chamber by adjusting the amount of heat.

A support plate on which the charging unit, the secondary battery are mounted on the upper surface, An electrically conductive conductive plate provided on one side edge region of the support plate; A pressing plate which is provided at an upper portion of the conductive plate so as to be able to move up and down to press the electrode lead of the secondary battery to contact the conductive plate; And a power supply cable having one side connected to the conductive plate and the other side extending outwardly through the gas analysis chamber.

And a fixing plate which is vertically coupled to the support plate with the secondary battery interposed therebetween.

Wherein the gas analysis chamber comprises: a chamber body provided in a box shape with one side opened and to be coupled with the charging unit, the temperature control unit, and the sensing unit; A chamber cover interposed between the chamber body and shielding the chamber body; And a sealing member interposed between the chamber main body and the chamber cover.

The sensing unit may include a plurality of temperature measurement sensors arranged at predetermined intervals in the direction of the wall of the gas analysis chamber in the secondary battery to measure a temperature of the space inside the secondary battery and the gas analysis chamber.

The sensing unit may include a pressure gauge for measuring the internal pressure of the gas analysis chamber.

The temperature control unit may include a hot line provided on at least one of a bottom surface and a side wall surface of the gas analysis chamber.

The temperature control unit may further include a heat radiation pad disposed on the heat ray and radiating heat transferred from the heat ray into the gas analysis chamber.

And an inert gas supply unit for supplying an inert gas to the gas analysis chamber.

The gas analyzing apparatus may further include a gas valve connected to the gas analysis chamber on one side and a pipe for collecting gas generated in the secondary battery inside the gas analysis chamber on the other side.

And a safety valve coupled to the gas analysis chamber, wherein the safety valve is opened by pressure when the internal pressure of the gas analysis chamber exceeds a predetermined allowable pressure.

The gas analysis chamber may further include a vacuum pump for establishing a vacuum state.

And a fan unit for promoting the flow of the gas inside the gas analysis chamber.

According to another aspect of the present invention, there is provided a method of manufacturing a secondary battery, comprising: disposing a secondary battery inside a gas analysis chamber forming a closed space; Measuring a pressure of the gas analysis chamber, measuring a temperature of the secondary battery and a space inside the gas analysis chamber, and calculating a temperature average value; Charging and discharging the secondary battery; Measuring a pressure of the gas analysis chamber after the gas is vented in the secondary battery, measuring a temperature of the space inside the secondary battery and the gas analysis chamber, and calculating a temperature average value; And an ideal gas state equation is applied to compare the total number of moles of gas in the gas analysis chamber before the gas is vented in the secondary battery and the total number of moles of gas in the gas analysis chamber after the gas is vented in the secondary cell And calculating the amount of gas vented in the secondary battery.

The method may further include sequentially increasing the temperature of the gas analysis chamber after calculating the pressure measurement and the temperature average value of the gas analysis chamber.

According to an aspect of the present invention, it is possible to effectively perform the quantitative and qualitative analysis of the venting gas of the secondary battery at a specific potential with a structure optimized to the characteristics of the secondary battery.

According to another aspect of the present invention, the internal temperature conditions of the gas analysis chamber can be varied differently.

According to another aspect of the present invention, it is possible to prevent an explosion due to an increase in internal pressure of the gas analysis chamber.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an exploded view showing a configuration of a general secondary battery.
2 is a perspective view of a gas analysis apparatus for a secondary battery according to an embodiment of the present invention.
FIG. 3 is a view schematically showing a state in which the chamber lid is removed in FIG. 2. FIG.
4 is a schematic perspective view of a charging part according to an embodiment of the present invention.
FIG. 5 is a plan view of a charging unit in which a secondary battery cell is mounted according to an embodiment of the present invention. FIG.
Figs. 6 to 7 are sectional views of Fig. 5 for explaining the operation of the pressing plate.
8 is a schematic configuration diagram of a temperature measurement sensor according to an embodiment of the present invention.
9 is a schematic configuration diagram of a temperature control unit according to an embodiment of the present invention.
10 is a schematic flow chart for explaining a method for analyzing a gas for a secondary battery according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary terms, and the inventor should appropriately interpret the concepts of the terms appropriately It should be construed as meaning and concept consistent with the technical idea of the present invention based on the principle that it can be defined.

Therefore, the embodiments described in this specification and the configurations shown in the drawings are merely the most preferred embodiments of the present invention and do not represent all the technical ideas of the present invention. Therefore, It is to be understood that equivalents and modifications are possible.

In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail.

The embodiments of the present invention are provided to explain the present invention more fully to the ordinary artisan, so that the shape and size of the components in the drawings may be exaggerated, omitted or schematically shown for clarity. Thus, the size or ratio of each component does not entirely reflect the actual size or ratio.

FIG. 2 is a perspective view of a gas analysis apparatus for a secondary battery according to an embodiment of the present invention, and FIG. 3 is a view illustrating a state in which a chamber lid is separated in FIG.

2 to 3, the gas analyzer for a secondary battery according to the present invention includes a gas analysis chamber 100, a charging unit 200, a sensing unit 300, and a temperature control unit 400.

The gas analysis chamber 100 may include a chamber body 110 and a chamber lid 120 that can be disassembled and assembled from each other. In this embodiment, the chamber body 110 is provided in a rectangular parallelepiped shape having an open upper end, and the chamber lid is provided to shield the upper end of the chamber body 110. A plurality of insertion holes are formed in the sidewall of the chamber main body 110 so that the charging unit 200, the sensing unit 300 and the temperature control unit 400 are connected to each other. B) may be disposed.

The gas analysis chamber 100 provides a space corresponding to the volume of the gas equation for measuring a gas amount to be described later. It may be advantageous for the gas analysis chamber 100 to have a volume within 3 liters to 30 liters, for example, considering the amount of gas generated in one secondary battery cell B. However, the scope of the present invention is not limited to these matters.

Also, the gas analysis chamber 100 has a closed structure so that gas generated when the secondary battery cell B is charged or discharged or exposed to high temperature is not released to the outside. To this end, an o-ring or a sealing member of rubber material may be further provided on the contact surface between the chamber body 110 and the chamber lid 120 to maintain airtightness.

FIG. 5 is a plan view of a charging unit in which a secondary battery cell is mounted according to an embodiment of the present invention, and FIGS. 6 to 7 are plan views of a charging / Fig. 5 is a cross-sectional view of Fig.

The secondary battery cell B is charged or discharged by an electrochemical reaction between an active material, a metal plate, and an electrolyte. During the charging or discharging operation, a gas may be generated by an internal electrochemical reaction.

The charging unit 200 is electrically connected to the electrode lead of the secondary battery to induce generation of gas in the secondary battery cell B to charge or discharge the secondary battery.

4 to 7, the charging unit 200 includes a supporting plate 210, a conductive plate 220, a pressing plate 260, and a power supply cable 230.

The support plate 210 is configured to support the secondary battery cell B at a predetermined height from the bottom surface of the chamber body 110 at a place where the secondary battery cell B is seated. The support plate 210 may be provided as a plate-like plate. A fixing plate 211 may be further provided to fix the secondary battery cell B so as to prevent the secondary battery cell B mounted on the upper surface of the supporting plate 210 from flowing when the secondary battery cell B is driven. The fixing plate 211 may be a plate-shaped member of a base plate that is vertically coupled to the support plate 210 with the secondary battery cell B interposed therebetween.

An electrically conductive conductive plate 220 is provided on one side edge region of the support plate 210. The conductive plate 220 is a medium for connecting the secondary battery cell B and the power supply cable 230. The secondary battery cell B is seated on the support plate 210 so that the electrode lead is positioned on the upper side of the conductive plate 220. In this embodiment, the conductive plate 220 may be provided in a pair, which are separated from each other to correspond to the positive electrode lead and the negative electrode lead of the secondary battery cell B, respectively.

The pressure plate 260 functions to press the electrode lead L so that the electrode lead L of the secondary battery cell B can be in contact with the conductive plate 220. The pressing plate 260 is provided so as to be movable upward and downward from the upper portion of the conductive plate 220. 4 to 7, the pressing plate 260 is coupled to one end of the lifting shaft 250 in this embodiment. The stationary frame 240 is spaced apart from the support plate by a predetermined distance. And the lifting shaft 250 can be fitted in the threaded hole formed in the fixed frame 240. When the handle 250a coupled to the other side of the lift shaft 250 is rotated in the forward and reverse directions, the lift shaft 250 is raised or lowered. For example, when the user rotates the handle 250a in the forward direction, the pressing plate 260 coupled to the lifting shaft 250 moves down and the electrode lead portion of the secondary battery cell B is pressed by the pressing plate 220, . The conductive plate 220 is bolted to the terminal of the power supply cable 230. One end of the power supply cable 230 may be connected to the conductive plate 220 and the other end of the power supply cable 230 may be connected to an external power supply unit (not shown) and a load unit (not shown) through the gas analysis chamber 100.

The power unit (not shown) adjusts the voltage and / or the current to charge the secondary battery cell B and applies the voltage and / or current to the secondary battery cell B, and the load unit discharges the energy charged in the secondary battery cell B. The power supply unit and the load unit may be electrically connected to the power supply cable 230 selectively by a switching circuit (not shown).

According to the charge / discharge unit 200 of the present invention, since the contact between the electrode lead of the secondary battery cell B and the conductive plate 220 is stable, the charging / discharging process of the secondary battery cell B can be effectively performed.

The sensing unit 300 includes a pressure gauge 310 for measuring the pressure inside the gas analysis chamber 100 in a configuration for measuring the pressure and temperature of the gas analysis chamber 100, And a temperature measurement sensor 320 for measuring the temperature of the fluid.

The sensing unit 300 measures data of the temperature and the pressure of the gas analysis chamber 100 in the course of the experiment and provides data for calculating the amount of gas vented in the secondary battery cell B to be described later.

The temperature of the inner space of the gas analysis chamber 100 decreases as the distance from the secondary battery cell B increases. That is, the temperatures of the gases around the secondary battery cell B, which is a heat source, are relatively high while the temperatures of the gases relatively away from the secondary battery cell B are relatively low. Thus, the internal temperature of the gas analysis chamber 100 exhibits a non-uniform temperature distribution.

8 is a schematic configuration diagram of a temperature measurement sensor according to an embodiment of the present invention.

Referring to FIG. 8, the temperature measurement sensor 320 of the present invention is disposed at a plurality of points inside the gas analysis chamber 100 to solve the above-described problems. For example, a plurality of temperature measurement sensors 320 may be disposed at predetermined intervals in the upper, lower, left, and right wall surfaces of the gas analysis chamber 100 in the secondary battery cell B. The plurality of temperature measurement sensors 320 respectively measure temperatures inside the gas analysis chamber 100 at different positions and calculate temperature average values.

Meanwhile, a fan unit (not shown) may be further provided to accelerate the flow of the gas to reduce the internal temperature variation of the gas analysis chamber 100. The fan unit can effectively reduce the temperature deviation by transferring the heat around the secondary battery cell B to the gas adjacent to the wall surface of the gas analysis chamber 100. [

The gas analyzer for a secondary battery according to the present invention measures changes in volume, temperature, and pressure of the gas analysis chamber 100 before and after the gas generation of the secondary battery cell (B), and substitutes these data into the ideal gas- The amount of gas generated in the battery cell B is measured. Hereinafter, this will be described in detail.

The gas generated in the secondary battery cell (B) of this embodiment is not an ideal gas, so there may be some errors. However, reproducible results can be obtained even when the ideal gas state equation is applied in analyzing the variation amount of the gas which is vented at a certain temperature or potential range and the amount of gas generated in the secondary cell (B) is relatively small.

First, the pre-experiment gas analysis chamber 100 can be formed in a vacuum state so as to obtain a more accurate result value. To this end, the analyzing apparatus of the present invention may further include a vacuum pump (not shown) for creating a vacuum in the gas analysis chamber 100.

In addition, the interior of the pre-experiment gas analysis chamber 100 may be filled with an inert gas. To this end, the analyzer may further comprise an inert gas supply (not shown), which may be a tank filled with an inert gas. As the inert gas, for example, argon (Ar), helium (He) or the like can be used.

Next, all the valves connected to the gas analysis chamber 100 are shut off, and the secondary battery cell B is charged or discharged while varying temperature and voltage conditions.

Accordingly, the amount of gas generated in the secondary battery cell B can be calculated by the following equation using the ideal gas state equation as described above.

Where V n is the volume of the gas analysis chamber 100 and R is the gas constant and P 1 is the gas concentration in the gas bombardment gas analysis chamber T1 is the average temperature of the gas venting gas analysis chamber 100 in the secondary battery cell B and P2 is the average temperature of the gas in the gas analysis chamber 100 after gas venting in the secondary battery cell B, And T2 is an average temperature of the gas analysis chamber 100 after gas venting in the secondary battery cell B. [ In addition, the relation of P * V = n * R * T is established between the temperature, pressure and volume of the gas according to Boyle-Charles's law. That is, since the gas analysis chamber 100 provides an enclosed space, it can be seen that there is no volume change, so that the gas equation of the gas venting gas analysis chamber 100 in the secondary battery cell B is n1 * R * T1 = P1 * Vc and after the gas is vented in the secondary battery cell B, the gas equation is equal to n2 * R * T2 = P2 * Vc. Where n1 is the number of moles of inert gas and n2 is the total number of moles of inert gas and vented gas. Therefore, by summing up these gas equations, it is possible to obtain a change in the total number of moles of gas in the gas analysis chamber 100, and a change in the total number of moles means the amount of gas vented in the secondary battery cell B. That is, the volume of gas vented in the secondary battery cell B can be converted to? N * 22.4L in a standard state.

9 is a schematic configuration diagram of a temperature control unit according to an embodiment of the present invention.

The gas analyzer for a secondary battery of the present invention includes a temperature controller 400 for measuring the amount of venting gas under various environmental conditions. The temperature control unit 400 is configured to cause deterioration not only due to charging or discharging of the secondary battery cell B but also deterioration due to changes in external temperature conditions. 9, the temperature control unit 400 includes a heating line 410 provided on at least one of a bottom surface and a side wall surface of the gas analysis chamber 100 and a heat radiation pad 420).

The heating wire 410 is provided as a heating coil and may be connected to a power supply unit outside the gas analysis chamber 100. The power supply unit may be configured to control the amount of heat generated by the heating wire 410. The temperature inside the gas analysis chamber 100 can be gradually increased. The heat dissipation pad 420 functions to dissipate heat evenly inside the gas analysis chamber 100 while shielding the heat ray 410 from being exposed to the inside of the gas analysis chamber 100 as it is. As the heat-radiating pad 420, a Teflon sheet 420 may be applied.

In addition, the gas analyzer for a secondary battery of the present invention may further include a safety valve 600 (see FIGS. 2 to 3) for preventing an internal pressure of the gas analysis chamber 100 from being excessively increased and exploding in an experimental procedure . The safety valve 600 may be installed on one side of the chamber body 110 or on one side of the chamber cover 120 in the gas analysis chamber 100. If the preset pressure is exceeded, As shown in FIG.

In addition, the gas analyzer for a secondary battery of the present invention may further include a gas valve 500 (see FIGS. 2 to 3) for collecting gas bent in the secondary battery cell B and analyzing the gas. The gas valve 500 may be connected to the gas analysis chamber 100 on one side and the oil line forming the gas discharge path on the other side. And the duct can be connected to the gas collection chamber. The analytical apparatus of the present invention is configured such that the vacuum pump is driven in a state in which the gas valve 500 is opened at the beginning to form a vacuum pressure in the oil pipe in advance so that gases remaining in the gas analysis chamber 100, As shown in Fig.

The qualitative analysis of the collected gases is carried out by a generally known gas qualitative analysis method. For example, an infrared gas analyzer for continuously analyzing the concentration of a specific component in the presence of infrared rays, a photoelectric photometer using a photoelectric transducer, other gas detector tubes, a carbon monoxide analyzer, a carbon dioxide analyzer, and a hydrocarbon analyzer may be used.

10 is a schematic flow chart for explaining a method for analyzing a gas for a secondary battery according to an embodiment of the present invention.

Hereinafter, a gas analysis method for a secondary battery using the analyzing apparatus of the present invention will be briefly described with reference to FIG.

The method for analyzing gas for a secondary battery according to the present invention includes the steps of disposing (S100) a secondary battery in a gas analysis chamber (100) forming a closed space, measuring pressure of the gas analysis chamber (100) A step S200 of measuring the temperature of the internal space of the chamber 100 and calculating a temperature average value thereof, a step S300 of charging / discharging the secondary battery, a step of measuring the pressure of the gas analysis chamber 100 after the gas is vented in the secondary battery (S400) of measuring the temperature of the interior space of the secondary battery and the gas analysis chamber 100 and calculating an average temperature value of the secondary battery and the interior of the gas analysis chamber 100 before the gas is vented in the secondary battery by applying the ideal gas- (S500) of comparing the total number of moles of the gas of the secondary battery and the total number of moles of the gas inside the gas analysis chamber 100 after the gas is vented in the secondary battery.

The step of disposing the secondary battery includes the steps of placing the secondary battery cell B on the support plate 210 and fixing the fixing plate 211 on the supporting plate 210 to prevent the secondary battery cell B from flowing , And pressing the electrode lead of the secondary battery cell (B) to contact the conductive plate (220) by the pressing plate (260). For more accurate testing, the gas analysis chamber 100 can be evacuated and supplied with inert gas.

Next, the internal pressure and temperature average value of the gas analysis chamber 100 are measured before the gas is vented in the secondary battery cell B through the sensing unit 300. The measured pressure and temperature average values may be input to a data processing unit (not shown). The data processing unit may be programmed to calculate the number of moles of gas from the volume Vc of the pre-input gas analysis chamber 100 and the pressure and temperature average values from the sensing unit 300. The resultant value processed in the data processing unit, that is, the amount of vented gas, may be displayed on a separate display device for the user to confirm. Of course, the configuration of the data processing unit may be omitted, and the user may directly read the pressure and temperature average value and calculate the gas amount.

Next, a current is applied to the secondary battery cell (B) or the secondary battery cell (B) is discharged. At this time, the secondary battery cell B can be charged or discharged while voltage and temperature conditions are different (S400). The voltage applied to the secondary battery cell B can be controlled by the charging unit 200 and the temperature can be gradually increased by controlling the amount of heat generated by the heating wire 410 by the temperature control unit 400. [ Then, the temperature and pressure of the gas analysis chamber 100 are measured again at a specific voltage, temperature and time elapsed time. Based on the measured pressure and temperature data, the gas equations before and after gas venting are compared to calculate the number of moles and volume of the vented gas.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but many variations and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims. It will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the scope of the appended claims.

On the other hand, in the present specification. It is to be understood that the terminology such as up, down, left, right, etc., is used for convenience of explanation, but can be expressed differently depending on the viewing position of the observer or the position of the object. To be clear to.

100: gas analysis chamber
110: chamber body
120: chamber cover
200:
210: Support plate
220: conductive plate
230: Power supply cable
240: Fixed frame
250: lifting shaft
260: pressure plate
300: sensing part
310: Pressure gauge
320: Temperature measurement sensor
400: temperature control unit
410: Heat line
420: heat radiating pad
500: Gas valve
600: Safety valve

Claims (15)

A gas analysis chamber in which the secondary battery is housed and forms a closed space;
A charger supporting the secondary battery and connected to the electrode lead of the secondary battery to charge or discharge the secondary battery;
A sensing unit sensing the pressure and temperature of the gas analysis chamber; And
And a temperature controller for supplying heat to the inside of the gas analysis chamber and sequentially increasing the temperature of the gas analysis chamber by adjusting the amount of heat. The method according to claim 1,
The charging /
A supporting plate on which the secondary battery is seated;
An electrically conductive conductive plate provided on one side edge region of the support plate;
A pressing plate which is provided at an upper portion of the conductive plate so as to be able to move up and down to press the electrode lead of the secondary battery to contact the conductive plate; And
And a power supply cable connected to the conductive plate on the one side and extending outwardly through the gas analysis chamber on the other side. 3. The method of claim 2,
Further comprising a fixing plate which is vertically coupled to the support plate with the secondary battery interposed therebetween. The method according to claim 1,
The gas analysis chamber includes:
A chamber body provided at one side in an open box shape and coupled with the charging part, the temperature control part, and the sensing part;
A chamber cover interposed between the chamber body and shielding the chamber body; And
And a sealing member disposed on a contact surface between the chamber body and the chamber lid. The method according to claim 1,
The sensing unit includes:
And a plurality of temperature measurement sensors arranged at predetermined intervals in the direction of the wall of the gas analysis chamber in the secondary battery to measure the temperature of the space inside the secondary battery and the gas analysis chamber. . The method according to claim 1,
The sensing unit includes:
And a pressure gauge for measuring the internal pressure of the gas analysis chamber. The method according to claim 1,
The temperature control unit includes:
And a hot line provided at least one of a bottom surface and a side wall surface of the gas analysis chamber. 8. The method of claim 7,
The temperature control unit includes:
And a heat dissipation pad disposed on the heat ray to dissipate the heat transferred from the heat ray into the gas analysis chamber. The method according to claim 1,
Further comprising an inert gas supply unit for supplying an inert gas to the gas analysis chamber. The method according to claim 1,
Further comprising a gas valve connected to the gas analysis chamber on one side and to a pipe for collecting gas generated in the secondary battery inside the gas analysis chamber on the other side. The method according to claim 1,
Further comprising a safety valve coupled to the gas analysis chamber and opened by pressure when the internal pressure of the gas analysis chamber exceeds a preset allowable pressure. The method according to claim 1,
Further comprising a vacuum pump for creating a vacuum state in the gas analysis chamber. The method according to claim 1,
And a fan unit for promoting the flow of the gas inside the gas analysis chamber. Disposing a secondary battery in a gas analysis chamber forming a closed space;
Measuring a pressure of the gas analysis chamber, measuring a temperature of the secondary battery and a space inside the gas analysis chamber, and calculating a temperature average value;
Charging and discharging the secondary battery;
Measuring a pressure of the gas analysis chamber after the gas is vented in the secondary battery, measuring a temperature of the space inside the secondary battery and the gas analysis chamber, and calculating a temperature average value; And
The ideal gas state equation is applied to compare the total number of moles of gas in the gas analysis chamber before the gas is vented in the secondary cell and the total number of moles of gas in the gas analysis chamber after the gas is vented in the secondary cell, And calculating the amount of gas vented in the secondary battery. 15. The method of claim 14,
After the step of calculating the pressure measurement and temperature average value of the gas analysis chamber,
Further comprising the step of sequentially raising the temperature of the gas analysis chamber.

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