KR20200069775A - Battery charge-discharge cycle test after battery over-discharge test apparatus and method - Google Patents

Abstract

According to an embodiment of the present invention, provided is an apparatus for testing a charge/discharge cycle after a battery overdischarge test. The apparatus comprises: a chamber configured to test a battery under a set temperature; a battery overdischarge test unit for discharging the battery under a set discharge condition; a temperature measurement unit including a chamber internal temperature measurement sensor capable of measuring a temperature inside the chamber in order to check a set temperature and a battery temperature measurement sensor for measuring a temperature change in the battery; a voltage measurement unit for measuring a voltage of the battery; a data collection unit connected to the temperature measurement unit and the voltage measurement unit to collect measured values and displaying the measured values; and a battery charge/discharge cycle test unit for performing a test that performs a charge/discharge cycle repeating charge and discharge on the overdischarged battery a predetermined number of times so as to calculate a battery capacity measurement result according to the performance.

Description

Charging and discharging cycle test device and method after battery overdischarge test {BATTERY CHARGE-DISCHARGE CYCLE TEST AFTER BATTERY OVER-DISCHARGE TEST APPARATUS AND METHOD}

The present invention relates to an apparatus and a method for testing and discharging cycles after a battery overdischarge test capable of performing a battery charge/discharge cycle test after causing the battery to overdischarge to a degree that may occur in real life.

2. Description of the Related Art As the development and research of batteries continues in the 2000s, the spread of portable devices such as smartphones, notebooks, and tablet PCs in which batteries are used as an energy source is increasing.

In particular, lithium-ion batteries are secondary batteries that can be reused repeatedly through charging and discharging, and are mainly used as power sources for mobile devices and electric vehicles because they can obtain high voltage and high current density. As described above, a lithium ion battery is an efficient energy source of high energy and high density, but due to such characteristics, there is a risk of ignition and explosion.

In the real life, when the battery is overdischarged due to a malfunction of the charger, etc., and the consumer continues to use charging and discharging repeatedly without being ignited, a dendrite phenomenon that occurs on the surface of the battery electrode occurs, separation membrane perforation, The battery may ignite due to the evaporation of the electrolyte. Therefore, even if the battery is over-discharged during use in daily life, safety must be verified through a charge-discharge cycle test.

Korean Registered Patent No. 10-1220910 (2013.01.04.)

In embodiments of the present invention, when a battery is continuously discharged and used after a battery is overdischarged due to malfunction of a charger or a battery module in real life, a battery overdischarge test and a charge/discharge cycle test device that can determine the safety of the battery and Provide a method.

An embodiment of the present invention, a chamber formed to test the battery under a set temperature, a battery over-discharge test unit for over-discharging the battery with a set discharge condition, to measure the temperature inside the chamber to confirm the set temperature A temperature measurement unit including a temperature measurement sensor inside the chamber and a battery temperature measurement sensor for measuring a temperature change of the battery, a voltage measurement unit for measuring the voltage of the battery, and a connection with the temperature measurement unit and the voltage measurement unit Battery charging that collects and displays the measured values, and performs a test that calculates a battery capacity measurement result by performing a charging/discharging cycle that repeats charging and discharging on the overdischarged battery a predetermined number of times. After a battery overdischarge test including a discharge cycle test unit, a charge/discharge cycle test device may be provided.

At this time, the battery charge/discharge cycle test unit calculates a charging unit for charging the over-discharged battery, a discharge unit for supplying and discharging current to the over-discharged battery, and a set number of charge-discharge cycles and a result of measuring the battery capacity accordingly. It may include a display unit to display.

At this time, the set temperature may be in the range of 15 °C to 25 °C.

At this time, the set discharge condition may set the discharge rate of the battery to 0.2C-rate, thereby discharging the voltage of the battery to reach a value between 0.0V and 2.5V.

At this time, the set number of charge/discharge cycles may be 100 or more times.

In one embodiment of the present invention, the chamber is set to a temperature within a range of 15°C to 25°C to prepare a battery over-discharge test unit and a battery charge-discharge cycle test unit therein, set in a battery over-discharge test unit The over-discharge step of over-discharging the battery under the discharge condition and the charge-discharge cycle of repeating charging and discharging on the over-discharged battery in the battery charge-discharge cycle test unit are performed at least 100 times to calculate the result of battery capacity measurement A method for testing a charge-discharge cycle after a battery over-discharge test including the step of performing a charge-discharge cycle test may be provided.

At this time, the set discharge condition may set the discharge rate of the battery to 0.2C-rate, thereby discharging the voltage of the battery to reach a value between 0.0V and 2.5V.

Other aspects, features and advantages other than those described above will become apparent from the following drawings, claims and description of the invention.

Charging and discharging cycle test apparatus and method after the battery overdischarge test according to an embodiment of the present invention, while using the battery in real life, the charger, the battery module, etc. malfunction, and after the overdischarge, the battery continues to not ignite When used as a battery, the safety of the battery can be checked.

1 is a block diagram showing a charge/discharge cycle test apparatus after a battery overdischarge test according to an embodiment of the present invention.
2 is a flowchart illustrating a method for testing a charge/discharge cycle after a battery overdischarge test of a battery according to an embodiment of the present invention.

The present invention can be applied to a variety of transformations and may have various embodiments, and specific embodiments will be illustrated in the drawings and described in detail in the detailed description. Effects and features of the present invention and methods for achieving them will be clarified with reference to embodiments described below in detail with reference to the drawings. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in various forms.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. When describing with reference to the drawings, identical or corresponding components will be denoted by the same reference numerals and redundant description thereof will be omitted. .

In the following examples, terms such as first and second are not used in a limited sense, but for the purpose of distinguishing one component from other components.

In the following embodiments, the singular expression includes the plural expression unless the context clearly indicates otherwise.

In the examples below, terms such as include or have are meant to mean the presence of features or components described in the specification, and do not preclude the possibility of adding one or more other features or components in advance.

In the following embodiments, when a part of a film, region, component, etc. is said to be on or on another part, as well as when it is directly above the other part, other films, regions, components, etc. are intervened Also included.

In the drawings, the size of components may be exaggerated or reduced for convenience of description. For example, since the size and thickness of each component shown in the drawings are arbitrarily shown for convenience of description, the present invention is not necessarily limited to what is shown.

When an embodiment can be implemented differently, a specific process order may be performed differently from the described order. For example, two processes described in succession may be performed substantially simultaneously, or may be performed in an order opposite to that described.

In the following embodiments, when a membrane, region, component, etc. is connected, other membranes, regions, components are interposed in the middle of the membrane, region, components, as well as when the membranes, regions, components are directly connected. It is also included indirectly. For example, in the present specification, when a membrane, region, component, etc. is electrically connected, not only is the membrane, region, component, etc. directly electrically connected, but other membranes, regions, components, etc. are interposed therebetween. Also includes indirect electrical connection.

Hereinafter, with reference to FIG. 1, a charge/discharge cycle test apparatus 10 after a battery overdischarge test according to an embodiment of the present invention will be described.

1 is a block diagram showing a charge/discharge cycle test apparatus after a battery overdischarge test according to an embodiment of the present invention.

Referring to FIG. 1, after a battery over-discharge test according to an embodiment of the present invention, the charge-discharge cycle test apparatus 10 includes a chamber 100, a battery over-discharge test unit 300, a temperature measurement unit 400, and a voltage It may include a measurement unit 500, a data collection unit 600, a battery charge and discharge cycle test unit 700.

The chamber 100 may be formed to test the battery 200 under a set temperature. The shape of the chamber 100 is not limited, and may be formed to an appropriate size to perform a test on the battery 200 under a set temperature. The chamber 100 may be made of a material and a structure that secures durability so as to protect a user's safety and minimize risk in preparation for a heat and explosion accident that may occur inside.

The battery 200 is not limited to a specific shape such as a square shape, a cylindrical shape, or a pouch shape, and may have any shape. Testing may be performed using a battery 200 of a type that is a target of an applied device. At this time, the battery 200 may be one or a plurality.

The battery over-discharge test unit 300 may over-discharge the battery 200 under a preset discharge condition.

The set discharge condition may set the discharge rate of the battery 200 to 0.2C-rate to discharge the voltage of the battery 200 to reach a value between 0.0V and 2.5V.

The discharge rate of the battery 200 is set to 0.2 C-rate, and discharge is performed, so that the voltage of the finally reached battery 200 reaches a value between 0.0V and 2.5V. At this time, the voltage value that finally reaches the discharge of the battery 200 should be such that the battery 200 does not ignite or explode. In the real life, even after the battery 200 is over-discharged, leakage or explosion, ignition, etc. are not observed in the battery 200, so that the battery safety must be confirmed in a case where the battery 200 can be continuously used. Because.

The temperature measurement unit 400 may include a temperature measurement sensor and a battery temperature measurement sensor inside the chamber. The temperature measurement sensor inside the chamber can measure the temperature inside the chamber to confirm the set temperature. The chamber temperature measurement sensor may check whether the temperature inside the chamber 100 corresponds to a set temperature and whether to maintain the set temperature over time. The battery temperature measurement sensor can measure the temperature change over time of the battery 200, respectively, and check the state change before and after over-discharge. When attaching the battery temperature sensor to the surface of the battery 200, a polycarbonate film is used to prevent damage to the surface. In addition, the temperature change after the charge/discharge cycle test is performed by the battery charge/discharge cycle test unit 700 may be measured.

The voltage measuring unit 500 may measure voltage changes over time of the battery 200, respectively, and may measure changes in the voltage of the battery 200 before and after over-discharge. In addition, the battery 200 may measure a state of change in voltage after the battery charge/discharge cycle test unit 700 performs a charge/discharge cycle test.

The data collection unit 600 may be connected to the temperature measurement unit 400 and the voltage measurement unit 500 to collect and display measured values. Temperature and voltage measurements of the battery 200 may be collected and displayed at set time intervals.

The battery charge/discharge cycle test unit 700 may perform a test for calculating a battery capacity measurement result according to a predetermined number of charge/discharge cycles that repeat charging and discharging on the overdischarged battery 200. The battery charge/discharge cycle test unit 700 may include a charging unit, a discharging unit, and a display unit. The charging unit may charge the over-discharged battery 200, and the discharge unit may supply and discharge the current to the over-discharged battery 200. The display unit may calculate and display the set number of charge/discharge cycles and the measured battery capacity measurement result accordingly. The set number of charge/discharge cycles is preferably 100 or more.

For example, in the case of the charging/discharging cycle test using the constant current test method, a constant current is applied to the battery 200 to measure a change in voltage over time of the battery over time to check characteristics. When the battery 200 is a lithium ion battery, the voltage of the battery 200 increases in the case of charging, and the voltage of the battery 200 decreases in the case of discharge. Typically, the charging voltage uses a voltage of 4.3 V or less for electrolyte decomposition and electrode material safety, and in the case of discharge voltage, measures up to 3 V for discharge voltage to prevent damage to the electrode material due to over-discharge. do. In this way, the battery 200 performs a cycle process of repeating charging and discharging within a range representing a specific voltage, thereby calculating a capacity measurement result of the battery and performing a test.

Meanwhile, after the battery over-discharge test, the charge-discharge cycle test apparatus 10 may further include an air filter unit capable of separately discharging toxic gases, etc., since there may be a possibility of ignition or explosion in the process of testing the battery 200. have.

3 is a flow chart showing a step-by-step method for charging and discharging cycles after a battery overdischarge test according to an embodiment of the present invention.

Hereinafter, a charging and discharging cycle test method after a battery overdischarge test according to an embodiment of the present invention will be described with reference to FIG. 3.

Step S100 is a preparation step of setting the inside of the chamber 200 to a temperature within the range of 15°C to 25°C to install the battery over-discharge test unit 300 and the battery charge-discharge cycle test unit 400 therein.

Step S200 is an over-discharge step of over-discharging the battery 200 under a discharge condition set by the battery over-discharge test unit 300. At this time, the set discharge condition may set the discharge rate of the battery 200 to 0.2C-rate, thereby discharging the voltage of the battery 200 to reach a value between 0.0V and 2.5V. This corresponds to the extent to which the battery 200 does not ignite or explode, and should be able to proceed with the subsequent steps. In the real life, even after the battery 200 is over-discharged, leakage or explosion, ignition, etc. are not observed in the battery 200, so that the battery safety must be confirmed in a case where the battery 200 can be continuously used. Because.

In step S300, a charge/discharge cycle test that performs a charge/discharge cycle that repeats charging and discharging of the overcharged battery 200 at least 100 times in the battery charge/discharge cycle test unit 700 to calculate a battery capacity measurement result accordingly It is a step to perform.

As described above, after the battery over-discharge test according to embodiments of the present invention, the charge-discharge cycle test apparatus 10 and the measuring method continue to use the battery even when over-discharge occurs in a daily use environment when the battery is used in real life. Charging and discharging tests can be performed on the used battery to check the safety of the battery. Therefore, even if an over-discharge occurs in the battery, it is possible to test the safety of the battery by assuming an environment in which the battery is continuously used in daily life.

As described above, the present invention has been described with reference to one embodiment shown in the drawings, but this is only an example, and those skilled in the art will understand that various modifications and modifications of the embodiments are possible therefrom. Therefore, the true technical protection scope of the present invention should be determined by the technical spirit of the appended claims.

10: Charging and discharging cycle test device after battery overdischarge test
100: chamber
200: battery
300: battery over-discharge test unit
400: temperature measuring unit
500: voltage measuring unit
600: data collection unit
700: battery charge and discharge cycle test unit

Claims (7)

A chamber formed to test the battery under a set temperature;
A battery over-discharge test unit for over-discharging the battery under a set discharge condition;
A temperature measuring unit including a chamber temperature measuring sensor capable of measuring the temperature inside the chamber and a battery temperature measuring sensor for measuring the temperature change of the battery to check the set temperature;
A voltage measuring unit for measuring the voltage of the battery;
A data collection unit connected to the temperature measurement unit and the voltage measurement unit to collect and display measured values; And
A battery charge/discharge cycle test unit performing a test for calculating a battery capacity measurement result by performing a charge/discharge cycle repeating charging and discharging on the overdischarged battery a predetermined number of times. Discharge cycle test device. According to claim 1,
The battery charge and discharge cycle test unit
A battery over-discharge including a charging unit for charging the over-discharged battery, a discharge unit for supplying and discharging current to the over-discharged battery, and a display unit for calculating and displaying a set number of charge and discharge cycles and a result of measuring the battery capacity accordingly. Charging and discharging cycle test device after test. According to claim 1,
The set temperature is in the range of 15 °C to 25 °C, the battery over-discharge test and charge-discharge cycle test device. According to claim 1,
The set discharge condition sets the discharge rate of the battery to 0.2C-rate, and discharges the voltage of the battery to reach a value between 0.0V and 2.5V, after a battery overdischarge test, a charge and discharge cycle test device. According to claim 1,
The set number of times of the charge/discharge cycle is 100 or more times, and a charge/discharge cycle test device after a battery overdischarge test. A preparation step of setting the inside of the chamber to a temperature within the range of 15°C to 25°C to install a battery over-discharge test unit and a battery charge-discharge cycle test unit therein;
An over-discharge step of over-discharging the battery under a discharge condition set by a battery over-discharge test unit; And
A battery charging/discharging cycle test unit performs a charging/discharging cycle test to perform a charging/discharging cycle of repeating charging and discharging on the overdischarged battery at least 100 times to calculate a battery capacity measurement result accordingly. Charging/discharging cycle test method after over-discharge test. The method of claim 6,
The set discharge condition is to set the discharge rate of the battery to 0.2C-rate, to discharge the voltage of the battery to reach a value between 0.0V and 2.5V, after the battery over-discharge test, charge and discharge cycle test method.

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