KR102130724B1 - Apparatus for Measuring Generation Amount of Inner Gas Using Coin Cell - Google Patents

Abstract

The present invention relates to an internal gas generation amount measurement device using a coin cell, and more particularly, as an internal gas generation amount measurement device using a coin cell, a coin-shaped electrode assembly is housed in a battery case and generated inside. Two or more coin cells having openings in a portion of the battery case to allow the gas to be discharged; A first jig in which indentations corresponding to the outer shapes of coin cells are formed so that coin cells are mounted, and in the indentations, a first gas movement path for gas movement is formed; A second jig coupled to the first jig to seal the coin cells mounted on the first jig and having a second gas passage communicating with the first gas passages of the indentations; A gas sensor positioned at an end of the second gas passage to measure the pressure of the gas; And a heating chamber for heating the first jig and the second jig for discharging the internal gas of the coin cells.

Description

Apparatus for Measuring Generation Amount of Inner Gas Using Coin Cell}

The present invention relates to an apparatus for measuring the amount of generated internal gas using a coin cell.

Recently, rechargeable secondary batteries have been widely used as an energy source for wireless mobile devices. In addition, the secondary battery is attracting attention as an energy source for electric vehicles, hybrid electric vehicles, and the like, which have been proposed as solutions for air pollution, such as existing gasoline vehicles and diesel vehicles using fossil fuels. Therefore, the types of applications using secondary batteries are very diversified due to the advantages of secondary batteries, and it is expected that secondary batteries will be applied to more fields and products than now.

These secondary batteries may be classified into lithium ion batteries, lithium ion polymer batteries, lithium polymer batteries, etc., depending on the configuration of the electrode and electrolyte. Among them, the possibility of leakage of the electrolyte is low, and the usage of lithium ion polymer batteries that are easy to manufacture is Is increasing.

In general, a secondary battery may generate gas inside while the battery is operated in an abnormal state due to overcharging, overdischarging, overheating, external shock, or the like. For example, the overheated battery generates gas and the pressurized gas in the case further accelerates the decomposition reaction of the battery element, causing continuous overheating and gas generation, and a swelling phenomenon may occur. This phenomenon also occurs in the process of slowly deteriorating the secondary battery due to long-term use.

1 is a schematic diagram for measuring a swelling phenomenon of a conventional secondary battery.

Referring to FIG. 1, the conventional thickness measuring device 10 is equipped with a battery cell 30 mounted on a base 13 and a load is applied using a weight 20 from above, while the battery cell 30 is applied by the sensor 15. ) To measure the swelling phenomenon.

As described above, in order to evaluate the swelling phenomenon of the conventional secondary battery, the secondary battery must be tested in the material development stage, which is the stage before product development, but the production period is long and costly because the samples for testing must be produced in full cell size. There is a problem that it is consumed a lot.

In addition, there is a problem in that it is difficult to evaluate all the causes of the swelling phenomenon by evaluating only some samples due to the production period and manufacturing cost.

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

Specifically, the object of the present invention is to solve the problem of the swelling phenomenon of the secondary battery, simplifies the evaluation method for all the causes of the swelling phenomenon in the battery cell development stage by measuring the amount of gas generated per material in coin cell units It is to provide an internal gas generation amount measurement device capable of performing the gas generation amount measurement evaluation.

The apparatus for measuring the amount of generated internal gas using a coin cell according to the present invention for achieving the above object is an apparatus for measuring the amount of generated internal gas using a coin cell, in which a coin-shaped electrode assembly is housed in a battery case. Two or more coin cells having openings perforated in a part of the battery case so that generated gas can be discharged; A first jig in which indentations corresponding to the outer shapes of coin cells are formed so that coin cells are mounted, and in the indentations, a first gas movement path for gas movement is formed; A second jig coupled to the first jig to seal the coin cells mounted on the first jig and having a second gas passage communicating with the first gas passages of the indentations; A gas sensor positioned at an end of the second gas passage to measure the pressure of the gas; And a heating chamber for heating the first jig and the second jig to discharge the internal gas of the coin cells.

That is, the apparatus for measuring internal gas generation using a coin cell according to the present invention is for solving a problem of a swelling phenomenon of a battery cell, and swelling in a battery cell development step to measure gas generation amount per material in coin cell units It is possible to perform gas emission measurement evaluation by simplifying the evaluation method for all causes of the phenomenon.

According to the present invention, the coin cell may include a coin full cell, a coin half cell, and a dummy cell.

In this case, the coin pull cell may have a structure in which an anode, a cathode, and an electrolyte are stored.

In addition, the coin half cell may include a fully charged coin half cell and a full discharge coin half cell.

At this time, the coin half cell may be formed of a structure in which an anode or a cathode is housed together with an electrolyte.

According to the present invention, the dummy cell may be made of a structure in which aluminum foil of electrode thickness is accommodated, and is not limited as long as it is a material having a similar thickness.

In one specific example, the indentations of the first jig are arranged in m rows × n columns, and m and n may be a natural number of 1 to 5 independently of each other.

In other cases, the indentations of the first jig are 3 to 10, and may be a structure arranged in a circular shape with respect to the center of the first jig.

According to the present invention, the first gas moving path may be formed of a resin-type structure communicating with each indentation in a plane.

In this case, the resin-like structure of the first gas moving path may be a structure in which gases generated from indentations are centrally collected in a flat plane.

In the above structure, grooves for mounting the gasket along the outer periphery may be formed in the first and second jigs to prevent the gas generated at the indentations from flowing out.

In addition, the second gas movement path may be formed with a structure in which a gas inlet port communicates with the first gas movement path of the first jig and the gas outlet port is located on the outer surface of the second jig.

In this structure, the second gas moving furnace may be formed in a structure that vertically penetrates the second jig.

For example, the heating temperature of the heating chamber may be in the range of 40°C to 120°C, preferably 50°C to 115°C, more preferably 70°C to 110°C.

According to the present invention, the apparatus may further include a gas valve for controlling gas movement between the gas sensor and the upper portion of the second gas movement path of the second jig.

For example, the apparatus may further include a control unit that calculates a pressure change and a gas generation amount according to the signal from signals received from the gas sensor.

The present invention also provides a battery cell manufactured based on the internal gas generation amount of the coin cell.

The present invention also provides a battery pack including a battery cell as a unit cell.

The present invention also provides a device including a battery pack.

The device may include a computer, a mobile phone, a wearable electronic device, a power tool, an electric vehicle (EV), a hybrid electric vehicle, a plug-in hybrid electric vehicle, an electric motorcycle, an electric golf cart, or a system for power storage. It may be selected from the like.

Since the structure and manufacturing method of such a device are known in the art, detailed description thereof is omitted in this specification.

As described above, the apparatus for measuring an internal gas generation amount using a coin cell according to the present invention can simplify the evaluation method for all the causes of the swelling phenomenon in the battery cell development stage and perform gas generation amount measurement evaluation.

In addition, it is possible to provide a battery cell that solves a problem caused by a swelling phenomenon based on an inspection result of an internal gas generation measuring device using a coin cell, thereby providing an effect of securing performance and safety of the battery cell.

1 is a schematic diagram for measuring a swelling phenomenon of a conventional secondary battery;
2 is a schematic diagram of an apparatus for measuring an internal gas generation amount using a coin cell according to an embodiment of the present invention;
3 is a schematic view of a first jig mounting the coin cells and coin cells of FIG. 2;
4 is a schematic view of the second jig of FIG. 2;
5 is a perspective view of the first and second jigs of FIGS. 2 to 4;
6 is a graph showing the test results of coin cells of different configurations;
7 is a graph showing the gas generation amount test result of the positive electrode material according to the voltage difference;
8 is a flow chart showing the result of the gas generation test between the positive electrode active materials.

Hereinafter, with reference to the drawings according to embodiments of the present invention, it is for easier understanding of the present invention, and the scope of the present invention is not limited thereto.

2 is a schematic diagram of an apparatus for measuring an internal gas generation amount using a coin cell according to an embodiment of the present invention.

Referring to FIG. 2, the internal gas generation amount measuring device 100 includes two or more coin cells 110 having openings perforated in a part of the battery case, and a first jig 130 in which the coin cells 110 are mounted, A second jig 150 coupled to the first jig, a gas sensor 170 measuring the pressure of the coin cells 110, and a heating chamber 190 heating the first and second jigs 130, 150 It is configured to include.

The coin cells 110 are respectively seated in the indentations 133 of the first jig 130, and the first gas moving path 135 is coin cells 110 accommodated in the respective indentations 133. ) Gases are collected.

A gasket 180 is mounted between the first jig 130 and the second jig 150 to prevent the gas generated in the coin cells 110 from flowing into a portion other than the designed gas passage.

A gas valve 175 is attached between the upper portion of the second gas movement path 155 of the second jig 150 and the gas sensor 170 to control gas movement.

3 is a plan view and a side view of a first jig mounting coin cells and coin cells of FIG. 2.

Referring to FIG. 3, the coin cells 110 include a coin full cell 111, coin half cells 113, and a dummy cell 116, and the coin half cell 113 is a fully charged coin half It comprises a cell 114 and a full discharge coin half cell 115.

The coin cells 110 are respectively seated on the indentations 133 of the first jig 130. The four indentations 133 of the first jig 130 are arranged at regular intervals with respect to the center of the first jig 130 in 2 rows × 2 columns, and the centers of the indentations 133 are the first jig It may be arranged in a circle based on the center of (130).

The first gas moving path 135 is formed of a resinous structure in communication with each indentation portion 133 in a plan view. The communication structure of the first gas moving path 135 is centrally located in a plane, and gases generated in the coin cells 110 housed in the respective indentations 133 are collected.

A gasket along the outer periphery of the first jig 130 is provided on the upper surface of the first jig 130 to prevent the gas generated in the indentations 133 from leaking to a portion other than the designed gas passage (FIG. 2: 180 ) Is provided with a groove 139 for mounting.

4 is a plan view and a side view of the second jig of FIG. 2.

Referring to FIG. 4 together with FIGS. 2 and 3, the second jig 150 is a structure that engages with the first jig (FIG. 3: 130 ). The second jig 150 has a gasket (FIG. 2: 180) along the outer periphery to prevent the gas generated in the indentations 133 of the first jig 130 from flowing into a portion other than the designed gas passage. A groove 159 for mounting is formed.

In the second gas movement path 155, the gas inlet 156 communicates with the first gas movement path (FIG. 3: 135) of the first jig (FIG. 3: 130), and the gas outlet 157 has a second jig ( Located on the outer surface of 150), it is formed in a structure that vertically penetrates the second jig 150.

A gas sensor 170 for measuring the pressure of the gas is attached to a portion of the gas outlet 157 of the second gas movement path 155 of the second jig 150.

The first jig 130 and the second jig 150 have grooves for mounting the gasket 180 along the outer periphery so as to prevent the gas generated in the indentations 133 from flowing out of the designed gas passage. Fields 139 and 159 are formed, respectively.

5 is a perspective view of the first jig and the second jig of FIGS. 2 to 4.

Referring to FIG. 5, as described above, a perspective view showing a coupling relationship between shapes of the first jig 130 and the second jig 150 corresponding to each other is illustrated. A groove 139 for mounting a gasket (FIG. 2: 180) is formed around the planar circular indentations 133 of the first jig 130. Accordingly, the gas generated in the coin cells (FIG. 2: 110) flows through the first and second gas moving paths 135 and 155 of the first and second jigs 130 and 150.

6 is a graph showing the test results of coin cells of different configurations.

Referring to FIG. 6, the coin cell includes a coin full cell, a coin half cell, and a dummy cell. The coin pull cell contains an anode, a cathode, and an electrolyte. The coin half-cell consists of a full-charge coin half-cell and a full-discharge coin half-cell, and the coin half-cell consists of a structure in which an anode and an electrolyte are stored. The dummy cell contains aluminum foil having an electrode thickness.

Lines shown by solid lines indicate coin full cells, fully charged coin half cells, full discharge coin half cells, and dummy cells in order from the top.

Each coin cell is mounted on a jig and heated in a heating chamber at 90° C. for 5 hours, and the amount of gas generated and the type of gas generated through the difference between the respective coin cells are shown in Table 1 below. The amount of gas generated by the constituent materials can be quantified.

Pressure (bar, @5h, 90℃) Δ pressure (bar, @5h, 90℃) Remark Coin full cell 1.34 0.37 (28%) Cathode gas Fully charged coin half cell 0.97 0.25 (19%) Anode gas Full discharge coin half cell 0.72 0.28 (12%) Volatilization of electrolyte Dummy cell 0.44 0.44 (33%) Dead space in jig

7 is a graph showing the gas generation amount test result of the positive electrode material according to the voltage difference.

Referring to FIG. 7, a test result of a gas generation amount of a cathode material according to voltage is illustrated. As in the previous test, each coin cell was mounted on a jig and heated in a heating chamber at 90° C. for 5 hours, and the graph of FIG. 7 was shown.

The test was performed at different voltages of 4.4V and 4.5V while the positive electrode material according to the voltage was accommodated in the heating chamber, and among the lines shown in solid lines in the graph, if the voltage is 4.5V in order from the top, the voltage is 4.4V. It is a case, it is shown in the graph of Figure 7 and Table 2, it can be seen the amount of gas generated in the positive electrode material according to the voltage difference.

Active substance amount (mg) Δ pressure (@5h, 90℃) 4.4V 26 0.92 4.5V 26 1.08

Through this, it can be seen that when the voltage is higher than 4.5V, the amount of gas generation increased by 11%.

8 is a flow chart showing the results of the gas generation test between the positive electrode active material.

Referring to FIG. 8, a test was performed at 4.5V, which is the same voltage, to indicate the gas generation amount test result between the positive electrode active materials, and is shown in the graph of FIG. 8 and Table 3 below.

Active substance amount (mg) Δ pressure (@5h, 90℃) 1) Sample#1 26 0.92 2) Sample#2 26 1.08 3) Sample#3 26 0.98 4) Sample#4 26 0.90 5) Sample#5 26 1.08

As in the table, the tests were performed with five active materials 1) to 5), and the actual injection amount and the active material amount were different, but were performed under similar conditions.

Among the lines shown as solid lines, 2) Sample#2 and 5) Sample#5 from above are relatively the same pressure, and the solid lines below the lines are in order 3) Sample#3, 1) Sample#1, and 4 ) It shows the pressure of Sample#4.

That is, it can be seen that 2) Sample#2 and 5) Sample#5's pressure is measured to be higher than that of other materials, and thus the pressure is high, resulting in a large amount of gas, so that excellent quality cannot be obtained at actual high temperatures.

On the contrary, it can be seen that the pressures of 1) Sample#1 and 4) Sample#4, which are low in pressure, are low compared to other materials, so that the gas generation amount is small, so that excellent quality can be obtained at actual high temperatures.

Those skilled in the art to which the present invention pertains will be able to make various applications and modifications within the scope of the present invention based on the above.

Claims (19)

A device for measuring the amount of gas generated using a coin cell,
Two or more coin cells in which a coin-shaped electrode assembly is housed in a battery case, and an opening is perforated in a portion of the battery case so that gas generated therein can be discharged;
A first jig in which indentations corresponding to the outer shape of coin cells are formed so that coin cells are mounted, and a first gas movement path for gas movement is formed in the indentations;
A second jig coupled to the first jig to seal coin cells mounted on the first jig and having a second gas passage communicating with the first gas passages of the indentations;
A gas sensor positioned at an end of the second gas passage to measure the pressure of the gas; And
A heating chamber for heating the first jig and the second jig to discharge the internal gas of the coin cells;
Including,
In the indentations of the first jig, a coin full cell, a coin half cell, a full discharge coin half cell, and a dummy cell are mounted,
The first gas passage is a resin-type structure in which the gases generated from the indentations are communicated with each indentation in a plane, and in the center in a plane,
The second gas moving furnace is characterized in that the gas inlet is in communication with the first gas moving path of the first jig, the gas outlet is located on the outer surface of the second jig, and is formed in a structure that vertically penetrates the second jig. Coin cell internal gas generation measuring device. delete According to claim 1, wherein the coin cell is a positive electrode, a negative electrode, and the internal gas generation amount measuring device of the coin cell, characterized in that made of a structure in which the electrolyte is stored. delete According to claim 1, The coin half cell is a device for measuring the amount of gas generated inside a coin cell, characterized in that the anode or the cathode is made of a structure that is housed together with the electrolyte. [4] The apparatus of claim 3, wherein the dummy cell has a structure in which an aluminum foil having an electrode thickness is accommodated. According to claim 1, wherein the indentations of the first jig are arranged in m rows × n columns, the m and n are each independently of each other a natural number of 1 to 5 coin gas measuring device of the internal gas generation. According to claim 1, wherein the first jig has three to ten indentations, and a device for measuring the amount of gas generated inside a coin cell, characterized in that it is arranged in a circular shape with respect to the center of the first jig. delete delete The interior of the coin cell according to claim 1, wherein grooves for mounting a gasket along an outer periphery are formed in the first and second jigs to prevent the gas generated at the indentations from flowing out. Gas generation measuring device. delete delete The apparatus of claim 1, wherein the heating temperature of the heating chamber is in the range of 40°C to 120°C. The apparatus of claim 1, wherein the device further comprises a gas valve for controlling gas movement between a gas sensor and an upper portion of the second gas movement path of the second jig. The apparatus of claim 1, wherein the device further comprises a control unit for calculating a pressure change and a gas generation amount according to a signal from signals received from the gas sensor. delete delete delete

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