KR101764299B1 - Nail for penetration test of secondary battery and secondary battery penetration test device using thereof - Google Patents

Abstract

A nail for a secondary battery penetration experiment and an experiment device for a secondary battery penetration using the same are disclosed.
A nail for a secondary battery penetration test according to the present invention comprises: a conductive nail body part having an inner hollow and receiving an external force and being press-fitted into a secondary battery; And a sensor module disposed in the hollow of the nail body to generate an induction current according to a magnetic field formed by a current flowing in the nail body portion. The sensing module acquires various sensing information through a nail to measure a calorific value of the secondary battery And improve the reliability and accuracy of the safety assessment.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a nail for penetrating a secondary battery,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a nail for a secondary battery penetration experiment and an apparatus for testing the penetration of a secondary battery using the same, and more particularly, The present invention relates to a nail for battery penetration experiment and an apparatus for inserting the same through a secondary battery using the same.

Generally, a secondary battery is a battery which can be charged and discharged unlike a primary battery which can not be charged. 2. Description of the Related Art [0002] With the recent rapid increase in the number of devices using secondary batteries such as mobile devices and electric vehicles, interest and demand for technologies for improving safety as well as performance of secondary batteries are rapidly increasing.

If such overcharging, overdischarge, or internal short-circuiting occurs during use of the secondary battery, the internal pressure of the secondary battery is rapidly increased due to heat generation and electrolytic decomposition reaction. As a result, serious accidents such as explosion or fire may occur. Therefore, in order to make the secondary battery practical, various safety evaluation tests for the secondary battery should be performed in the research and development stages. Particularly, in order to evaluate the safety against the internal short circuit of the secondary battery, a nail formed with a tip is passed through the secondary battery to induce an internal short circuit of the secondary battery, and then a secondary battery penetration test for evaluating the heating state is performed have.

To this end, the existing techniques are disclosed in Korean Patent Laid-Open Publication No. 10-2011-0021970, for example, in which the nail is passed through while the secondary battery is pressed and fixed, or as disclosed in Korean Patent Application Laid-Open No. 10-2013-0043478 And various types of penetration experiment devices such as adjusting the penetration depth of the nail to the secondary battery are proposed.

However, in these conventional technologies, the nail passing through the secondary battery is used only as a member for short-circuiting the inside of the secondary battery. That is, the conventional techniques have a problem that the contact resistance between the electrode inside the secondary battery and the nail has an important influence on the measurement of calorific value, which is the main purpose of the penetration test, but does not consider it at all. In addition, existing technologies do not provide any technology to improve the reliability and accuracy of the calorimetric measurement or safety evaluation of the secondary battery by acquiring various sensing information through the nail.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a nail for a secondary battery penetration experiment capable of acquiring contact resistance information between a secondary battery and a nail and transmitting various sensing information.

It is another object of the present invention to provide a secondary battery penetration experiment device that acquires various sensing information through nail to improve the reliability and accuracy of the calorific value measurement and safety evaluation of the secondary battery.

According to an aspect of the present invention, there is provided a nail for a secondary battery penetration test, comprising: a conductive nail body having an inner hollow and being pressed into a secondary battery by receiving an external force; And a sensor module part disposed in the hollow of the nail body part and generating an induced current according to a magnetic field formed by a current flowing in the nail body part.

In one embodiment, the nail body part has an opening connected to the inner hollow at one end and may have a leading end at the other end that is press-fitted into the secondary battery.

In one embodiment, the sensor module portion includes: a helical coil disposed to extend from the opening side of the nail body portion toward the tip end portion; And a terminal portion for electrically connecting both ends of the helical coil to an external device.

In one embodiment, the sensor module part may further include a non-conductive case inserted into the hollow of the nail body part to receive the helical coil.

In one embodiment, the sensor module unit may further include a temperature sensor for sensing the temperature of the nail body.

In one embodiment, the nail may further include a nail head part coupled to one end of the nail body part to fix and support the nail body part.

In order to solve the above problems, an apparatus for testing a secondary battery penetration according to the present invention comprises: a conductive nail body part having an inner hollow and receiving an external force and being press-fitted into a secondary battery; A nail including a sensor module portion for generating an induced current in accordance with a magnetic field formed by a current flowing through the nail; And a measuring unit for measuring the magnitude of the induced current generated by the sensor module unit of the nail to generate predetermined measurement information.

In one embodiment, the measuring unit may measure the magnitude of the induced current to generate contact resistance information between the nail body part of the nail and the secondary battery in which the nail body part is press-fitted.

In one embodiment, the sensor module portion of the nail may further include a temperature sensor for sensing the temperature of the nail body portion.

In one embodiment, the measuring unit may further generate secondary battery calorific value information by using the generated contact resistance information and the temperature information sensed by the temperature sensor.

According to the present invention, it is possible to obtain the contact resistance information between the secondary battery and the nail by allowing the induced current to be generated and measured according to the magnetic field formed by the current flowing in the nail during the secondary cell penetration test.

Also, by obtaining the contact resistance information between the secondary battery and the nail and the temperature information of the nail through the sensor module of the nail and using the information, it is possible to improve the reliability and accuracy of the calorimetric measurement and safety evaluation of the secondary battery.

In addition, when the body of the nail is damaged or deformed, only the nail body can be replaced, so that convenience and economy of the user can be achieved.

It will be apparent to those skilled in the art that various embodiments of the present invention can be accomplished without departing from the spirit and scope of the present invention.

1 is a block diagram showing an example of a secondary cell penetration test apparatus to which the present invention is applied.
FIG. 2A and FIG. 2B are diagrams illustrating an operation of an apparatus for testing a secondary battery penetration test apparatus according to an exemplary embodiment of the present invention.
3 is a cross-sectional view of a nail for testing a secondary battery penetration test according to an embodiment of the present invention.
FIG. 4 is an exploded perspective view showing a nail for a secondary battery penetration test according to an embodiment of the present invention. FIG.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings in order to clarify the solution to the technical problem of the present invention. In the following description of the present invention, however, the description of related arts will be omitted if the gist of the present invention becomes obscure. In addition, the terms described below are defined in consideration of the functions of the present invention, and may be changed depending on the intention or custom of the designer, the manufacturer, and the like. Therefore, the definition should be based on the contents throughout this specification.

FIG. 1 is a block diagram showing an example of a secondary battery penetration testing apparatus to which the present invention is applied.

1, the secondary battery penetration testing apparatus 100 may include a battery mounting unit 110, a sensing unit 120, an operation control unit 130, a measurement unit 140, and the like. That is, various types of secondary batteries to be tested are mounted on the battery mounting portion 110. To this end, the battery mounting portion 110 may include a table for mounting the secondary battery, a jig for fixing the secondary battery, and the like.

The sensing unit 120 acquires various sensing information from the object secondary battery using sensors of various types and shapes. As described below, the sensing unit 120 may include a nail for testing the penetration of the secondary battery according to the present invention as a kind of sensor. The nail is press-fitted into the secondary battery to cause an internal short circuit of the secondary battery, The predetermined sensing information can be obtained.

The operation control unit 130 may control various operations of the secondary battery penetration experiment apparatus 100 according to a user operation. For this, the operation control unit 130 may include a push-in driving unit 132, a charge / discharge control unit 134, and the like. That is, the press-in driving unit 132 presses the nail into the test object secondary cell to penetrate it. Generally, in the secondary cell penetration test apparatus 100, the nail is positioned on the upper portion of the secondary battery, and the press-in driving unit 132 moves and presses a predetermined pressing jig equipped with the nail downward, The nail can be press-fitted into the secondary battery by moving and pressing the table on which the secondary battery is mounted in the state of pushing or fixing the nail. In this case, the press-in driving unit 132 can adjust the penetration depth of the nail according to a user's operation. The charge / discharge control unit 134 can control the charging / discharging state of the secondary battery mounted on the battery loading unit 110. Discharge control unit 134 maintains the secondary battery in a fully charged state before passing through the nail.

The measuring unit 140 generates necessary measurement value information using the sensing information acquired by the sensing unit 120 from the secondary battery passed through the nail. For this purpose, the measuring unit 140 may include a sensing information processing unit 142, a storage unit 144, a display unit 146, and the like. That is, the sensing information processing unit 142 maps the sensed information acquired by the sensing unit 120 to a measurement value stored in the storage unit 144, using a predetermined calculation formula or an experimentally calculated value, Information can be generated. The sensing information processing unit 142 stores the measurement value information thus generated in a database and stores the information in the storage unit 144 or the display unit 146.

2A and 2B show an operation of the apparatus for testing a secondary battery penetration test apparatus according to an embodiment of the present invention.

As shown in FIGS. 2A and 2B, an apparatus for testing a secondary battery penetration test according to the present invention includes a nail 200 for a secondary battery penetration test and a measuring unit 230. That is, the nail 200 moves downward toward the mounting table 220 on which the secondary battery 210 is mounted, and is pressed into the secondary battery 210. The nail 200 may be pressed into the secondary battery 210 by moving the mounting table 220 upward in a state where the nail 200 is fixed. In this case, the mounting table 220 may be provided with a through hole 222 so that the nail 200 can sufficiently penetrate the secondary battery 210. Generally, the secondary battery 200 accommodates an electrode assembly in which a positive electrode plate, a negative electrode plate, and a separator for electrically insulating the two electrode plates are repeatedly stacked or laminated inside the case. Therefore, when the nail 200 passes through the secondary battery 210, the surface of the nail 200 is short-circuited between the internal electrode plates of the secondary battery 210, A current flows through the surface of the substrate 200.

The nail 200 acquires various sensing information related to the secondary battery 210 while passing through the secondary battery 210. In particular, the nail 200 generates an induced current in accordance with a magnetic field formed by a current flowing on the surface. Further, the nail 200 can sense a temperature generated due to an internal short circuit of the secondary battery 210. [

The measurement unit 230 generates necessary measurement value information using the sensing information acquired through the nail 200 and displays the generated measurement value information through the display unit 232. [ In particular, the measuring unit 230 may measure the magnitude of the induced current generated by the nail 200 to generate contact resistance information between the nail 200 and the secondary battery 210. The measuring unit 230 can generate necessary measurement information such as the calorific value information of the secondary battery using the contact resistance information, the temperature information of the nail 200, and the like.

FIGS. 3 and 4 are respectively a sectional view and an exploded perspective view of a nail for a secondary battery penetration test according to an embodiment of the present invention.

3 and 4, the nail 200 for testing a secondary battery penetration test according to the present invention includes a nail body part 300 and a sensor module part 310, and further includes a nail head part 320 can do. The nail body 300 has an inner hollow 302 as a member of a conductive material and receives an external force and is press-fitted into the secondary battery. To this end, the nail body 300 has an opening 304 connected to the inner hollow 302 at one end and a sharp pointed end 306 at the other end that is press-fitted into the secondary battery. For example, the nail body part 300 may be made of stainless steel, iron, nickel, or an alloy thereof having a known surface resistance.

The sensor module unit 310 is disposed in the inner hollow portion 302 of the nail body portion 300 and generates an induced current according to a magnetic field formed by a current flowing through the nail body portion 300. The sensor module unit 310 includes a helical coil 312 disposed to extend from the opening 304 side of the nail body unit 300 toward the tip 306, And a terminal portion 318 that electrically connects to the device. That is, a magnetic field is formed around the nail body part 300 according to a change in current flowing through the nail body part 300, and an induced current flows in the helical coil 312 according to the magnetic field. Thus, the induced current flowing through the helical coil 312 has a correlation with the nail body current flowing through the nail body 300. Therefore, the measuring unit 230 can generate the nail body part current information by measuring the magnitude of the induced current flowing through the helical coil 312 through the terminal unit 318. In this case, the terminal portion 318 includes terminals that are electrically connected to both ends of the helical coil 312 and are connected to a plug connector connected to the cable of the measuring portion 230, ). ≪ / RTI >

Next, the measuring unit 230 collects the voltage difference information between the contact surfaces of the nail body 300 and the secondary battery 210 and the voltage information of the secondary battery 210 from the electrode terminal of the nail 200 and the secondary battery 210 do. The measuring unit 230 generates contact resistance information between the nail body unit 300 and the secondary battery 210 in which the nail body unit 300 is inserted using the voltage related information and the nail body current information . Also, the measuring unit 230 generates the calorific value information of the secondary battery using the contact resistance information, the voltage information of the secondary battery, the nail body current information, and the like. The generated calorific value information in the secondary battery internal short circuit thus generated is an important evaluation factor in the safety evaluation of the secondary battery.

The sensor module portion 310 may further include an insulated case 314 inserted into the inner hollow portion 302 of the nail body portion 300 to receive the helical coil 312. The non-conductive case 314 prevents the nail body 300 and the helical coil 312 from being short-circuited by an external impact or the like, and facilitates the reuse of the sensor module unit 310. That is, in the case where the nail body 300 is damaged or deformed after the secondary cell penetration test is repeated, the user removes the non-conductive case 314 containing the helical coil 312 from the nail body 300, The sensor module unit 310 can be reused by inserting it into a new nail body.

In one embodiment, the sensor module unit 310 may further include a temperature sensor 316 that senses the temperature of the nail body unit 300. As the temperature sensor 316, various types and types of sensors such as a thermistor, a thermocouple, and the like can be used. In this case, the temperature sensor 316 is disposed in close contact with the inner surface of the nail body 300. In this case, the terminal portion 318 may include a terminal electrically connected to the temperature sensor 316 together with a terminal electrically connected to the helical coil 312. The temperature sensor 316 is coupled to the non-conductive case 314 that receives the spiral coil 312 to be used as one module in which the spiral coil 312, the non-conductive case 314, and the temperature sensor 316 are integrated .

If the sensor module unit 310 further includes the temperature sensor 316, the measuring unit 230 may use the temperature information sensed by the temperature sensor 316 together with the contact resistance information, It is possible to generate the calorific value information. For example, the measuring unit 230 generates the first secondary battery calorific value information using the contact resistance information as described above, and uses the temperature information of the nail sensed by the temperature sensor 316 to calculate the second secondary battery calorific value information It is possible to generate new secondary battery calorific value information with improved reliability and accuracy by comparing and correcting the first and second secondary battery calorific value information.

The nail 200 may further include a nail head 320 coupled to one end of the nail body 300 to fix and support the nail body 300. In this case, the nail head portion 320 may have an engagement groove 322 at one end thereof to which the one end of the nail body portion 300 is inserted and coupled. The nail head portion 320 may have a through hole 326 at a predetermined position so that a cable of an external device can be connected to the terminal portion 318 of the sensor module portion 310. The nail head 320 is generally fixedly coupled to a nail fixing structure (not shown) of the secondary battery penetration test apparatus. For this purpose, the nail head 320 may have threads for screwing on the outer circumferential surface of the other end portion 324, but may be modified in various forms according to the manner of coupling with the nail fixing structure .

As described above, according to the present invention, it is possible to obtain the contact resistance information between the secondary battery and the nail by generating an induced current according to the magnetic field formed by the current flowing in the nail during the secondary cell penetration test, have. Also, by obtaining the contact resistance information between the secondary battery and the nail and the temperature information of the nail through the sensor module of the nail and using the information, the reliability and accuracy of the calorimetric measurement and safety evaluation of the secondary battery can be improved. In addition, when the body of the nail is damaged or deformed, only the nail body can be replaced, so that convenience and economy of the user can be achieved. Furthermore, it is to be understood that various embodiments in accordance with the present invention may solve many technical problems in the art, as well as those described in the related art.

The present invention has been described with reference to specific embodiments. It will be apparent, however, to one skilled in the art that various modifications may be practiced within the technical scope of the invention. Therefore, the above-described embodiments should be considered from an illustrative point of view, not from a limiting viewpoint. That is, the scope of the true technical idea of the present invention is set forth in the appended claims, and all differences within the scope of equivalents thereof should be construed as being included in the present invention.

200: Secondary battery penetration test nail 300: Nail body part
310: Sensor module part 312: Spiral coil
314: non-conductive case 316: temperature sensor
318: terminal part 320: nail head part

Claims (10)

A conductive nail body part having an inner hollow and receiving an external force and being press-fitted into the secondary battery; And
And a sensor module part disposed in the hollow of the nail body part and generating an induced current according to a magnetic field formed by a current flowing in the nail body part,
The sensor module unit,
A helical coil disposed in the inner hollow of the nail body portion; And
And a terminal portion electrically connecting both ends of the helical coil to an external device. The method according to claim 1,
Wherein the nail body part has an opening at one end connected to the inner hollow and has a tip end at the other end that is pressed into the secondary battery. 3. The method of claim 2,
Wherein the helical coil is arranged to extend from the opening side of the nail body part toward the tip end side. The method according to claim 1,
Wherein the sensor module part further comprises a non-conductive case inserted into the hollow of the nail body part to receive the helical coil. The method according to claim 1,
Wherein the sensor module unit further comprises a temperature sensor for sensing a temperature of the nail body part. The method according to claim 1,
Wherein the nail further comprises a nail head part coupled to one end of the nail body part to fix and support the nail body part. A conductive nail body portion having an inner hollow and receiving an external force and being press-fitted into the secondary battery, and a sensor module portion disposed in the hollow of the nail body portion and generating an induced current according to a magnetic field formed by a current flowing in the nail body portion Nail; And
And a measuring unit for measuring a magnitude of an induced current generated by the sensor module unit of the nail and generating measurement information to be measured using the magnitude of the induced current,
The sensor module unit of the nail includes:
A helical coil disposed in the inner hollow of the nail body portion; And
And a terminal portion electrically connecting both ends of the helical coil to an external device. 8. The method of claim 7,
Wherein the measuring unit measures the magnitude of the induced current to generate contact resistance information between the nail body portion of the nail and the secondary battery in which the nail body portion is press-fitted. 8. The method of claim 7,
Wherein the sensor module unit of the nail further comprises a temperature sensor for sensing the temperature of the nail body part. 10. The method of claim 9,
Wherein the measuring unit further generates secondary battery calorific value information using the contact resistance information and the temperature information sensed by the temperature sensor.

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