KR102176864B1 - Cell unit and method for measuring electrochemical performance of metal-air secondary battery - Google Patents

Abstract

The present invention relates to a cell unit for evaluating the electrochemical performance of a metal-air secondary battery and a method for evaluating the electrochemical performance of a metal-air secondary battery, and more particularly, to an upper end having a lower end and a fastening structure; A lower end including a cell accommodating portion having an accommodating space for accommodating the battery cell therein; And a temperature controller for controlling the temperature of the battery cell. Including, wherein at least a portion of the temperature control unit is provided in the lower end portion and includes a heat conduction unit heating means for heating the battery cell, a cell unit and a metal for electrochemical performance evaluation of a metal-air secondary battery- It relates to a method for evaluating the electrochemical performance of an air secondary battery.

Description

Cell unit for electrochemical performance evaluation of metal-air secondary battery and electrochemical performance evaluation method of metal-air secondary battery {CELL UNIT AND METHOD FOR MEASURING ELECTROCHEMICAL PERFORMANCE OF METAL-AIR SECONDARY BATTERY}

The present invention relates to a cell unit for evaluating the electrochemical performance of a metal-air secondary battery at a high temperature and a method for evaluating the electrochemical performance of a metal-air secondary battery.

Batteries are widely used as a means for supplying power to electric devices. These batteries include primary batteries such as manganese batteries, alkaline manganese batteries, zinc-air batteries, and nickel cadmium (Ni- There are secondary batteries such as Cd) batteries, nickel hydride (Ni-MH) batteries, and lithium ion batteries.

Recently, lithium ion batteries are the most widely used secondary batteries, and there are still many problems to be solved, and there are several limitations such as relatively low theoretical energy unit density and natural reserves of lithium. Metal-air batteries such as lithium-air batteries have been proposed as a need for a next-generation secondary battery capable of reducing manufacturing costs while exhibiting high performance that can replace lithium-ion secondary batteries.

A metal-air battery is a battery that converts chemical energy into electrical energy by oxidizing a negative electrode active material such as zinc or aluminum using oxygen in the air instead of an oxidizing agent such as manganese dioxide as a positive electrode active material.

In order to improve the performance and stability of the metal-air battery, research and development are being actively conducted focusing on the anode of porous carbon, the anode of metallic lithium, zinc, and sodium, and the electrolyte material, and the material development and stability of the metal-air battery And in order to improve the performance, it is necessary to identify the electrochemical reaction and to develop an alternative electrolyte that does not deteriorate in the battery. However, when analyzing an existing electrochemical reaction, it is difficult to keep it stable and constant at a high temperature, and it is frequently exposed to an external environment, which makes it difficult to perform precise and accurate analysis. Accordingly, an electrochemical analysis method of a metal-air secondary battery that can efficiently heat a metal-air secondary battery to a high temperature and realize an accurate electrochemical performance analysis and evaluation by forming a stable high-temperature atmosphere and an equipment or system therefor is required. Do.

The present invention is to solve the above-described problem, the present invention, by efficiently heating the battery to control the battery temperature through the induction and characteristics of the electrochemical reaction of a high-temperature metal-air secondary battery, metal-air secondary It is to provide a cell unit for evaluating the electrochemical performance of a battery.

The present invention, by using the cell unit for the electrochemical performance evaluation of the metal-air secondary battery according to the present invention, the electrochemical performance evaluation method of a metal-air secondary battery capable of performing accurate and precise performance evaluation at high temperature Is to provide.

However, the problems to be solved by the present invention are not limited to those mentioned above, and other problems that are not mentioned will be clearly understood by those skilled in the art from the following description.

According to an embodiment of the present invention, the upper end having a lower end and a fastening structure; A lower end including a cell accommodating portion having an accommodating space for accommodating the battery cell therein; And a temperature control unit for controlling the temperature of the battery cell, wherein at least a portion of the temperature control unit includes a heat conduction unit heating means provided in the lower end to warm the battery cell, metal-air secondary It relates to a cell unit for evaluating the electrochemical performance of a battery.

According to an embodiment of the present invention, the temperature controller may be capable of maintaining the temperature of the battery cell at a temperature of room temperature to 200°C.

According to an embodiment of the present invention, the lower end and the upper end may be fastened to seal the battery cell.

According to an embodiment of the present invention, the upper end and the lower end may have a plurality of fixing protrusions and a plurality of fixing grooves corresponding to the fixing protrusions, respectively.

According to an embodiment of the present invention, an external fastening part for fastening the upper end and the lower part may be further included, and the external fastening part may have a ring shape fastened by a screw method.

According to an embodiment of the present invention, the lower end may further include a screw fastening part on the outer periphery.

According to an embodiment of the present invention, a rubber O-ring may be inserted into the external fastening part to fasten the upper and lower parts.

According to an embodiment of the present invention, it may further include a thermocouple inserted into the lower end.

According to an embodiment of the present invention, the upper end may further include a gas injection unit and a gas discharge unit.

According to an embodiment of the present invention, the battery cell may be a sodium, lithium or zinc-air secondary battery.

According to an embodiment of the present invention, a battery cell is mounted, preparing a sealed cell unit according to the present invention; Heating the battery cell inside the cell unit by operating a temperature controller of the cell unit; And measuring an electrochemical detection signal by repeatedly charging and discharging the battery cell. It relates to a method for evaluating the electrochemical performance of a metal-air secondary battery comprising a.

According to an embodiment of the present invention, the step of heating may be heating up to a temperature of 50° C. to 200° C. and maintaining the temperature.

According to an embodiment of the present invention, the measuring of the electrochemical detection signal includes a galvanostatic charge-discharge method, a cyclic voltammetry (CV) method, and a linear sweep voltammetry method. And measuring at least one electrochemical detection signal selected from the group consisting of electrochemical impedance spectroscopy (EIS).

According to an embodiment of the present invention, the measuring of the electrochemical detection signal may further include quantitative and qualitative analysis of gas generated from the battery cell.

The present invention can provide a cell unit of a metal-air secondary battery capable of stably driving at a high temperature by providing a heating unit in the cell unit and capable of driving at a high temperature capable of precise electrochemical measurement.

The present invention can accurately and stably evaluate the electrochemical reaction and performance of a metal-air secondary battery at high temperature, and can be utilized to improve the performance and material of a metal-air secondary battery by using this.

1 is an exploded perspective view illustrating an exemplary configuration of a cell unit of a metal-air secondary battery according to the present invention according to an embodiment of the present invention.
2A is a front cross-sectional view exemplarily showing a cell unit of a metal-air secondary battery according to the present invention, according to an embodiment of the present invention.
2B is a front cross-sectional view exemplarily showing a cell unit of a metal-air secondary battery according to the present invention, according to another embodiment of the present invention.
3 is an exploded perspective view illustrating an exemplary configuration of a cell unit of a metal-air secondary battery according to another embodiment of the present invention.
4 is an exemplary flowchart illustrating a method for evaluating electrochemical performance of a metal-air secondary battery according to the present invention according to an embodiment of the present invention.
5 shows an evaluation result by a method for evaluating electrochemical performance of a metal-air secondary battery according to the present invention, according to an embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In describing the present invention, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, a detailed description thereof will be omitted. In addition, terms used in the present specification are terms used to properly express preferred embodiments of the present invention, and may vary according to the intention of users or operators, or customs in the field to which the present invention belongs. Accordingly, definitions of these terms should be made based on the contents throughout the present specification. The same reference numerals in each drawing indicate the same members.

Throughout the specification, when a member is said to be positioned "on" another member, this includes not only the case where a member is in contact with another member, but also the case where another member exists between the two members.

Throughout the specification, when a part "includes" a certain component, it means that other components may be further included rather than excluding other components.

Hereinafter, a cell unit for evaluating the electrochemical performance of the metal-air secondary battery of the present invention will be described in detail with reference to Examples and drawings. However, the present invention is not limited to these examples and drawings.

The present invention relates to a cell unit for evaluating the electrochemical performance of a metal-air secondary battery.

According to an embodiment of the present invention, the cell unit will be described with reference to FIG. 1. In FIG. 1, the cell unit includes a case consisting of an upper portion 100 and a lower portion 200 with a space formed therein, and further includes an external fastening portion 300 that connects and fastens the upper portion 100 and the lower portion 200 can do.

The upper part 100 may form a fastening structure for sealing the inserted battery cell by fastening with the lower part 200. The upper part 100 may have an inner space for surrounding or accommodating the inserted battery cell. The inner space, 10% or more of the total volume of the upper portion 100; More than 30%; Alternatively, it may be formed in a volume ratio of 30% to 70%. When included in the volume ratio, it is possible to stably and efficiently form the heating and heating atmosphere of the battery cell.

The upper end 100 may have a protrusion 110 protruding from the outer peripheral surface perpendicular to the longitudinal direction of the upper end 100. The protrusion 110 may be formed at a position of 0% to 50% of the total length of the upper end 100. That is, referring to FIG. 2A, when the protrusion 110 is formed on the outer circumferential surface (0% of the length) of the lower end of the upper end 100, the protrusion 110 may be seated on the lower end 200. As another example, referring to FIG. 2B, when the protrusion 110 is formed on the outer peripheral surface (more than 0% of the length) of a certain height from the lower end of the upper end 100, the lower end of the upper end 100 is within the lower end 200 Forming a protruding coupling portion (A) to be inserted and fixed, the lower portion 200 accommodates the coupling portion (A) or a corresponding internal space or fixing groove is formed, and the protrusion portion 110 is on the lower portion 200 Is settled. The protrusion 110 may stably fasten the upper part 100 and the lower part 200 to seal the battery cell and provide a stable environment by minimizing external influences.

Moreover, the protrusion 110 is coupled to the upper end of the external fastening part 300 at the upper end 100 fitted in the external fastening part 300 when the external fastening part 300 is applied to firmly fix the upper end 100 It can be applied as a fastening member.

Referring to FIG. 3, the upper part 100 includes a protrusion 120 protruding from the inner upper region, the protrusion 120 is a ring shape, and the bottom surface 121 of the inner circumference of the protrusion 120 is flat or Grooves can be formed. In addition, a gas injection part 400 and a gas discharge part 400 ′ may be further formed on the bottom surface of the inner circumference of the protrusion 120. For example, a gas pipe of the gas discharge unit 400 and the gas injection unit 400 ′, or an injection hole for inserting a gas line may be formed.

According to an embodiment of the present invention, the cell unit may further include a gas discharge unit 400 and a gas injection unit 400 ′. The gas discharge unit 400 and the gas injection unit 400 ′ inject gas for inducing an electrochemical reaction of the battery cell and discharge gas generated by the electrochemical reaction. For example, in the gas discharge unit 400 and the gas injection unit 400 ′, a gas injection pipe and a gas discharge pipe are inserted into the upper end 100, and they may be further connected by a gas line. That is, the gas injection pipe and the gas discharge pipe may be connected to a pump to inject and discharge gas required for an electrochemical reaction, and may also form a vacuum atmosphere. In addition, the gas injection pipe and the gas discharge pipe may be connected to a gas analysis device to analyze a gas generated by an electrochemical reaction.

The lower part 200 accommodates the battery cell, and at least a part of the temperature control part for controlling the temperature of the battery cell is inserted, and the battery cell is heated or a heated atmosphere is formed inside the cell unit to perform an electrochemical reaction at a high temperature. You can induce. Referring to FIG. 1, the lower end portion 200 may include a cell accommodating portion 210 including an accommodating space 211 for accommodating and fixing a battery cell therein. The accommodation space 211 may be modified in various shapes according to the size and shape of the battery cell in order to fix the battery cell.

The cell accommodating part 210 is located at the upper end of the lower end 200, and includes a wall 212 surrounding the accommodating space 211 and fixing the inserted battery cell, and the wall 212 is of the accommodating space 211 It can be modified according to the shape. As another example, at least a portion of the cell receiving part 210 may be inserted in the depth direction of the lower part 200.

Referring to FIG. 2A, the temperature control unit 220 includes a single or a plurality of heat conduction unit heating means 221 for heating the battery cell, for example, a heater and a single or a plurality of heat conduction bands, and these include a lower end ( It may be introduced into the lower part 200 through the insertion hole formed in 200) or formed integrally and introduced into the lower part 200. Since the heat conduction unit is inserted into the cell unit of the heating means 221, it is possible to stably induce an electrochemical reaction at a high temperature by heating and maintaining the battery cell efficiently and stably.

Temperature control unit 220, room temperature or higher; 50 ℃ to 250 ℃; Or 50° C. to 200° C. and heated to a specific temperature for 1 minute or more; More than 10 minutes; More than 1 hour; Alternatively, it can be maintained for 1 to 50 hours.

The temperature control unit 220 may further include a single or a plurality of thermocouples 222 inserted into the lower end 200.

The lower part 200 may further include a screw fastening part 230 for fastening with the upper part 100 in a screw manner using an external fastening part 300 on the outer circumferential surface.

The external fastening member 300 has a ring shape that is fastened by a screw method, and by fastening the upper part 100 and the lower part 200 by a screw method, they are integrally fastened to form a case of a cell unit having a sealed structure. I can. By such a fastening, the receiving space 211 of the lower part 200 is sealed with the outside and an environment capable of stably inducing an electrochemical reaction without being affected by the external environment in a sealed state of the accommodated battery cell can be provided. . That is, the upper part 100 is seated on the lower part 200, and the external fastening member 300 inserts the upper part 100 and fixes them in a screw manner using the screw fastening part 230 formed on the lower part 200. can do.

The upper part 100 and the lower part 200 may each have a plurality of fixing protrusions and a plurality of fixing grooves corresponding to the fixing protrusions. For example, referring to FIGS. 1 and 3, a plurality of fixing grooves 130 are formed in the protrusion 110 of the upper part 100, and the lower part 200 is fixed to the area in contact with the upper part 100 A plurality of fixing protrusions 240 corresponding to the groove 130 may be formed. The fixing protrusion 240 is inserted into the fixing groove 130 of the upper part 100 to guide the coupling of the cell unit and may stably fasten the upper part 100 and the lower part 200.

According to another embodiment of the present invention, referring to FIG. 3, a cell unit for evaluating the electrochemical performance of the metal-air secondary battery includes a single or a plurality of rubber O-rings in order to seal the cell unit by blocking external air. 500) may be further included. The rubber O-rings 500 and 500 ′ block external air to make the inserted display cell more robust, thereby providing an environment capable of stably inducing an electrochemical reaction without being affected by the external environment. For example, the rubber O-ring 500 is inserted into the region where the upper end 100 and the lower end 200 are fastened, that is, the screw fastening part of the external fastening part 300 and fastened with the lower end 200, and the upper end 100 ) It can be fitted to the inner protrusion 120.

In order to induce and evaluate the electrochemical reaction, the cell unit controls the temperature control unit, the gas injection unit and the gas discharge unit, the operation of the battery cell, and the detection of the electrochemical reaction signal by software and analyzes the result. It may include an analysis unit including a device and a computer.

According to an embodiment of the present invention, the battery cell may be applied without limitation as long as it is a metal-air secondary battery, and includes, for example, magnesium, iron, aluminum, zinc, lithium or sodium lead-air secondary battery, and It may be a doll or the like.

The present invention relates to a method for evaluating electrochemical performance of a metal-air secondary battery, and according to an embodiment of the present invention, the evaluation method comprises a cell for evaluating the electrochemical performance of a metal-air secondary battery according to the present invention. The unit can be used to analyze and evaluate accurate and precise electrochemical reactions at high temperatures.

According to an embodiment of the present invention, the evaluation method will be described with reference to FIG. 4. 4 is a flowchart illustrating a method for evaluating electrochemical performance of a metal-air secondary battery according to an exemplary embodiment of the present invention. The method includes: preparing a sealed cell unit (210); Heating the battery cell inside the cell unit (220); And measuring an electrochemical detection signal 230.

The step 210 of preparing the sealed cell unit is a step of preparing a sealed cell unit by mounting the battery cell in the cell unit into which the temperature controller is inserted, and fastening the upper and lower ends, and as mentioned above, By further mounting the battery cell from the outside can be made more robust sealing.

The step of heating the battery cell 220 inside the cell unit is a step of heating the inserted battery cell inside the cell unit by operating a temperature control unit of the cell unit.

The step of heating 220 may include room temperature or higher; Or it may be to maintain the heating and temperature from 50 ℃ to 200 ℃.

The step 230 of measuring the electrochemical detection signal is a step of measuring the electrochemical detection signal by repeatedly performing sufficient and discharging of the heated battery cell.

The measuring of the electrochemical detection signal may include a galvanostatic charge-discharge method, a cyclic voltammetry (CV) method, a linear sweep voltammetry method, and an electrochemical impedance spectroscopy, EIS. At least one electrochemical detection signal selected from the group consisting of) can be measured. In addition, in the step of measuring the electrochemical detection signal, a gas analysis system may be introduced to quantitatively analyze the gas discharged during operation of the battery cell at high temperature, and thus may be utilized for evaluation of changes in physical properties and electrochemical performance of the battery cell. In such gas analysis, by sealing the cell unit to block the inflow of external air, precise and accurate gas analysis can be performed.

Hereinafter, the present invention will be described in more detail by examples and comparative examples. However, the following examples are for illustrative purposes only, and the contents of the present invention are not limited to the following examples.

Example 1

As shown in FIGS. 1 to 3, a 2032 coin cell of a lithium-oxygen secondary battery was mounted in the accommodation space of the lower part, and a sealed unit cell was manufactured by fastening the upper and lower parts. Next, the electrochemical performance was evaluated by performing a galvanostatic charge-discharge method at 150° C. for a current value of ±200 μA and charging/discharging for 5 hours each. The electrochemical performance was evaluated and shown in FIG. 5.

Referring to FIG. 5, it can be seen that precise and accurate electrochemical performance was evaluated by driving the coin cell at a temperature of 150°C.

As described above, although the embodiments have been described by the limited embodiments and drawings, various modifications and variations are possible from the above description by those of ordinary skill in the art. For example, even if the described techniques are performed in a different order from the described method, and/or the described components are combined or combined in a form different from the described method, or are replaced or substituted by other components or equivalents. Appropriate results can be achieved. Therefore, other implementations, other embodiments, and claims and equivalents fall within the scope of the claims to be described later.

Claims (14)

An upper end having a lower end and a fastening structure;
A lower end including a cell accommodating portion having an accommodating space for accommodating the battery cell therein; And
A temperature controller for controlling the temperature of the battery cell;
Including,
At least a portion of the temperature control unit includes a heat conduction unit heating means provided in the lower end to heat the battery cell,
The lower end and the upper end are fastened to seal the battery cell,
The upper end and the lower end are each formed with a plurality of fixing protrusions and a plurality of fixing grooves corresponding to the fixing protrusions,
Including an external fastening portion for fastening the upper end and the lower end,
The external fastening part has a ring shape fastened by a screw method,
The upper end portion is directed to an outer circumferential surface perpendicular to the longitudinal direction of the upper end, and includes a protrusion seated on the lower end, and the protrusion is coupled to the inner upper end of the outer fastening portion,
The lower end further includes a screw fastening part on the outer periphery,
The external fastening part and the screw fastening part are integrally fastened,
Further comprising a thermocouple inserted in the lower end to heat the battery cell,
The temperature control unit warms the battery cell to a temperature of 50° C. to 200° C.,
A cell unit for evaluating the electrochemical performance of a metal-air secondary battery, which measures the electrochemical detection signal of the battery cell and is used for quantitative and qualitative analysis of gas generated from the battery cell.
delete delete delete delete delete delete delete The method of claim 1,
The upper end portion further comprises a gas injection unit and a gas discharge unit,
Cell unit for evaluating the electrochemical performance of metal-air secondary batteries.
The method of claim 1,
The battery cell is sodium, lithium or zinc-air secondary battery,
Cell unit for evaluating the electrochemical performance of metal-air secondary batteries.
The battery cell is mounted, the step of preparing the sealed cell unit of claim 1;
Heating the battery cell inside the cell unit by operating a temperature controller of the cell unit; And
Measuring an electrochemical detection signal by repeatedly charging and discharging the battery cell;
Including,
The measuring of the electrochemical detection signal includes measuring the electrochemical detection signal, quantitative and qualitative analysis of gas generated in the battery cell,
The measuring of the electrochemical detection signal includes a galvanostatic charge-discharge method, a cyclic voltammetry (CV) method, a linear sweep voltammetry method, and an impedance measurement (electrochemical impedance spectroscopy, EIS). ) Measuring at least one electrochemical detection signal selected from the group consisting of,
The heating step is to warm up to a temperature of 50 ℃ to 200 ℃ and to maintain the temperature,
Method for evaluating electrochemical performance of metal-air secondary battery. delete delete delete

Images