Patent Publication Number: US-2021184280-A1

Title: Equipment and method for inspecting secondary battery

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     The present application claims the benefit of the priority of Korean Patent Application No. 10-2019-0068934, filed on Jun. 11, 2019, which is hereby incorporated by reference in its entirety. 
     TECHNICAL FIELD 
     The present invention relates to equipment and a method for inspecting a secondary battery, and more particularly, to equipment and a method for inspecting a secondary battery, wherein a process for inspecting the secondary battery is simplified. 
     BACKGROUND ART 
     In generally, secondary batteries refer to chargeable and dischargeable batteries unlike primary batteries that are not chargeable. Such secondary batteries are being used in high-tech electronic devices such as cellular phones, laptop computers, camcorders, and the like. 
     The secondary batteries are classified into a can type in which an electrode assembly is embedded in a cylindrical or prismatic metal can and a pouch type in which an electrode assembly is embedded in a pouch-shaped case made of an aluminum laminate sheet. It has been known that a cylindrical secondary battery in the can type has the relatively large battery capacity and the stable structure. 
     Here, the cylindrical secondary battery comprises an electrode assembly, in which electrodes and separators are alternately stacked, and a can for accommodating the electrode assembly. Also, a method for manufacturing the cylindrical secondary battery comprises an electrode manufacturing process for manufacturing an electrode, an electrode assembly manufacturing process for manufacturing an electrode assembly by alternately stacking electrodes and separators, an electrode assembly accommodating process for accommodating the electrode assembly in a can, and a cap assembly coupling process for coupling a cap assembly to an opening portion of the can to complete the secondary battery. 
     Here, the method for manufacturing a cylindrical secondary battery further comprises a secondary battery inspecting process for inspecting the quality of the completed secondary battery. 
     However, in a secondary battery inspecting process in the related art, it is inconvenient for operators, by themselves, to put a completed secondary battery manufactured in a cap assembly coupling process into inspection equipment, and particularly, there is a problem that a large amount of inspection time is consumed because completed secondary batteries have to be inspected individually. 
     DISCLOSURE OF THE INVENTION 
     Technical Problem 
     The present invention has been made to solve the problem described above, and an object of the present invention is to provide equipment and a method for inspecting a secondary battery, wherein automation is applied to automatically put completed secondary batteries into inspection equipment, and work efficiency may be increased and an inspection time may be significantly reduced, by simultaneously inspecting the plurality of completed secondary batteries which are put into the inspection equipment. 
     Technical Solution 
     An equipment for inspecting a secondary battery according to the present invention in order to achieve the object described above comprises: a loading device on which a secondary battery is loadable in an upright position; and a side portion inspecting device configured to inspect a side portion of the secondary battery loaded on the loading device, wherein the side portion inspecting device comprises: an elevation unit configured to lift the secondary battery loaded on the loading device so as to be withdrawn out of the loading device from an original position and configured to cause the secondary battery to return to its original position after a first period of time elapses; and a side portion inspecting unit configured to capture an image of the side portion of the secondary battery, which is withdrawn out of the loading device by the elevation unit, thereby inspecting the side portion of the secondary battery. 
     The elevation unit may comprise: a magnet attachable to the secondary battery, which is loaded on the loading device, when power is applied; an elevation body configured to cause the magnet to ascend or descend; and an elevation member configured to cause the elevation body to ascend or descend so as to withdraw the secondary battery, which is attached to the magnet, out of the loading device or cause the secondary battery to return to its original position. 
     The side portion inspecting unit may be configured to capture the image of the side portion of the secondary battery, which is withdrawn out of the loading device by the magnet, to perform the inspection through the captured image. 
     The side portion inspecting device may further comprise a rotation unit configured to cause the magnet to rotate in a state in which the secondary battery is withdrawn out of the loading device so as to cause the secondary battery, which is attached to the magnet, to rotate. 
     The loading device may comprise a loading plate provided with one or more loading parts may be configured to accommodate the secondary battery in the upright position, wherein each of the loading parts comprises: an insertion groove in which the secondary battery is accommodated in the upright position; and a through-hole defined in a bottom surface of the insertion groove. 
     The equipment may further comprise an upper/lower portion inspecting device configured to inspect each of upper and lower portions of the secondary battery loaded on the loading device. 
     The upper/lower portion inspecting device may comprise: an upper portion inspecting member configured to inspect the upper portion of the secondary battery loaded on the loading device; and a lower portion inspecting member configured to inspect the lower portion of the secondary battery, which is loaded on the loading plate, through the through-hole defined in the loading part. 
     The upper portion inspecting member and the lower portion inspecting member may be configured to capture images of the respective upper and lower portions of the secondary battery to perform the inspection through the captured images. 
     The equipment may further comprise a transporting device configured to transport the loading device, which is positioned in a first section, to a second section in which the side portion inspecting device is positioned and transport the loading device, which is positioned in the second section, to a third section in which the upper/lower portion inspecting device is positioned. 
     Also, a method for inspecting a secondary battery according to the present invention comprises: a secondary battery loading step of loading a secondary battery in an upright position on a loading device positioned in a first section; a first transporting step of transporting the loading device, on which the secondary battery is loaded, from the first section to a second section; a side portion inspecting step of inspecting a side portion of the secondary battery which is loaded on the loading device and transported to the second section; and a second transporting step of transporting the loading device, on which the secondary battery of which the side portion is inspected is loaded, from the second section to a third section, wherein the side portion inspecting step comprises: an elevation process of lifting the secondary battery loaded on the loading device so as to be withdrawn out of the loading device from an original position; a side portion inspecting process of inspecting the side portion of the secondary battery withdrawn out of the loading device; and a return process of returning the inspected secondary battery to its original position. 
     In the elevation process, a magnet may be attached to the secondary battery loaded on the loading device, and the magnet to which the secondary battery is attached may be lifted to withdraw the secondary battery out of the loading device. 
     In the side portion inspecting process, an image of the side portion of the secondary battery, which is withdrawn out of the loading device by the magnet, may be captured to perform the inspection through the captured image. 
     The method may further comprise, after the second transporting step, an upper/lower portion inspecting step in which each of upper and lower portions of the secondary battery, which is loaded on the loading device and transported to the third section, is inspected. 
     The upper/lower portion inspecting step may comprise: an upper portion inspecting process of inspecting the upper portion of the secondary battery loaded on the loading device; and a lower portion inspecting process of inspecting the lower portion of the secondary battery loaded on the loading device. 
     In the upper portion inspecting process and the lower portion inspecting process, images of the respective upper and lower portions of the secondary battery loaded on the loading device may be captured to perform the inspection through the captured images. 
     Advantageous Effects 
     Firstly, the equipment for inspecting the secondary battery of the present invention comprises the loading device and the side portion inspecting device for inspecting the side portion of the secondary battery loaded on the loading device, wherein the side portion inspecting device has the feature of comprising the elevation unit and the side portion inspecting unit. Due to the feature, the side portions of the plurality of secondary batteries loaded on the loading device may be simultaneously inspected. Therefore, the work efficiency may be increased, and the inspection time may be significantly reduced. 
     Secondly, the elevation unit in the equipment for inspecting the secondary battery of the present invention has the feature of comprising the magnet, the elevation body, and the elevation member. Due to the feature, the secondary battery loaded on the loading device may be effectively discharged out of the loading device, and the discharged secondary battery may be allowed to return to the original position so as to be loaded on the loading device. 
     Thirdly, the side portion inspecting unit in the equipment for inspecting the secondary battery of the present invention has the features of capturing the image of the secondary battery to perform the inspection through the captured image. Due to the feature, the side portion of the secondary battery withdrawn out of the loading device by the elevation unit may be accurately inspected. 
     Fourthly, the side portion inspecting device in the equipment for inspecting the secondary battery of the present invention has the feature of comprising the rotation unit for allowing the secondary battery, which is attached to the magnet, to rotate. Due to the feature, the entire side portion of the secondary battery attached to the magnet may be exposed to the side portion inspecting member. As a result, the entire side portion of the secondary battery may be effectively inspected. 
     Fifthly, the equipment for inspecting the secondary battery of the present invention has the feature of comprising the upper/lower portion inspecting device for inspecting the upper and lower portions of the secondary battery loaded on the loading device. Due to the feature, the upper and lower portions of the secondary battery may be effectively inspected while being loaded on the loading device. As a result, the inspection time may be significantly reduced. 
     Sixthly, the upper/lower portion inspecting device in the equipment for inspecting the secondary battery of the present invention has the feature of comprising the upper portion inspecting member and the lower portion inspecting member. Due to the feature, the upper and lower portions of the secondary battery loaded on the loading device may be accurately inspected. 
     Seventhly, the equipment for inspecting the secondary battery of the present invention has the feature of comprising the transporting device. Due to the feature, the loading device, on which the secondary battery is loaded, is transported to the second section in which the side portion inspecting device is positioned, and the loading device, which is positioned in the second section, may be automatically transported to the third section in which the upper/lower portion inspecting device is positioned. Therefore, the work efficiency may be increased, and the inspection time may be significantly reduced. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a plan view illustrating equipment for inspecting a secondary battery according to a first embodiment of the present invention. 
         FIG. 2  is a perspective view illustrating a loading device of the equipment for inspecting the secondary battery according to the first embodiment of the present invention. 
         FIG. 3  is a cross-sectional view illustrating a loading part of the loading device of  FIG. 2 . 
         FIG. 4  is a plan view illustrating a transporting device of the equipment for inspecting the secondary battery according to the first embodiment of the present invention. 
         FIG. 5  is a perspective view illustrating a side portion inspecting device of the equipment for inspecting the secondary battery according to the first embodiment of the present invention. 
         FIG. 6  is a front view illustrating the side portion inspecting device of the equipment for inspecting the secondary battery according to the first embodiment of the present invention. 
         FIG. 7  is a plan view illustrating the side portion inspecting device of the equipment for inspecting the secondary battery according to the first embodiment of the present invention. 
         FIG. 8  is a partially enlarged view illustrating the side portion inspecting device of the equipment for inspecting the secondary battery according to the first embodiment of the present invention. 
         FIG. 9  is a perspective view illustrating a rotation member comprised in the side portion inspecting device of the equipment for inspecting the secondary battery according to the first embodiment of the present invention. 
         FIG. 10  is a perspective view illustrating an operation state of the side portion inspecting device of the equipment for inspecting the secondary battery according to the first embodiment of the present invention. 
         FIG. 11  is a perspective view illustrating an upper/lower portion inspecting device of the equipment for inspecting the secondary battery according to the first embodiment of the present invention. 
         FIG. 12  is a plan view illustrating the upper/lower portion inspecting device of the equipment for inspecting the secondary battery according to the first embodiment of the present invention. 
         FIG. 13  is a flow chart illustrating a method for inspecting a secondary battery according to a second embodiment of the present invention. 
         FIG. 14  is a flow chart illustrating a side inspecting step according to the second embodiment of the present invention. 
         FIG. 15  is a flow chart illustrating an upper/lower inspecting step according the second embodiment of the present invention. 
     
    
    
     MODE FOR CARRYING OUT THE INVENTION 
     Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings so as to be easily carried out by a person skilled in the art to which the present invention pertains. However, the present invention may be embodied in several different forms, and not be limited to the embodiments set forth herein. In the drawings, anything unnecessary for describing the present invention will be omitted for clarity, and also like reference numerals refer to like elements throughout. 
     [Secondary Battery According to a First Embodiment of the Present Invention] 
     A secondary battery  10  according to a first embodiment of the present invention comprises an electrode assembly, a can for accommodating the electrode assembly, and a cap assembly mounted on an opening portion of the can. 
     An inspection process is performed to inspect whether or not a failure occurs in the secondary battery  10  according to the first embodiment of the present invention, which has the above constituents. Here, equipment for inspecting the secondary battery according to the first embodiment of the present invention is used. 
     Particularly, the equipment for inspecting the secondary battery according to the first embodiment of the present invention has a structure for inspecting each of side portions and upper and lower portions of a plurality of secondary batteries  10 . Thus, work efficiency for the secondary batteries may increase, and an inspection time may be reduced. 
     Hereinafter, the equipment for inspecting the secondary battery of the present invention will be described in more detail. 
     [Equipment for Inspecting the Secondary Battery According to the First Embodiment of the Present Invention] 
     As illustrated in  FIGS. 1 to 12 , the equipment for inspecting the secondary battery according to the first embodiment of the present invention comprises: a loading device  100  on which a can-type secondary battery  10  (hereinafter, referred to as a secondary battery) is loaded; a transporting device  200  for transporting the loading device  100  from a first section to a second section or from the second section to a third section; a side portion inspecting device  300  for inspecting a side portion of the secondary battery  10  which is loaded on the loading device  100  and transported to the second section by the transporting device  200 ; and an upper/lower portion inspecting device  400  for inspecting upper and lower portions of the secondary battery  10  which is loaded on the loading device  100  and transported to the third section by the transporting device  200 . 
     Here, when describing the equipment for inspecting the secondary battery of the present invention, an X-axis direction indicates forward and backward directions in which the loading device  100  is transported, and a Y-axis direction indicates left and right directions perpendicular to the transportation directions of the loading device  100  as illustrated in  FIG. 1 . 
     Loading Device 
     As illustrated in  FIGS. 1 to 3 , the loading device  100  is for loading the secondary battery, has a quadrangular shape, and comprises a loading plate  110  having a loading part  111  on which the secondary battery  10  is loaded in the upright position on the top surface, that is, in a state in which the cap assembly of the secondary battery  10  faces an upper side. 
     Here, the loading part  111  comprises: one or more insertion grooves  111   a ; and a through-hole  111   b  which is defined on the bottom surface of the insertion groove  111   a , has a diameter smaller than that of the insertion groove  111   a , and allows a lower portion of the secondary battery  10 , which is accommodated in the insertion groove  111   a , to be exposed to a lower side of the loading device  100 . 
     As one example, the loading plate  110  has 256 loading parts  111  which are arranged in 16 columns and 16 rows, and thus up to 256 secondary batteries  10  may be loaded on the loading plate  110  at once. 
     Particularly, the loading parts  111  are regularly arranged in the top surface of the loading plate  100 , and thus the 256 secondary batteries  10  loaded on the loading parts  111  may be inspected for the columns or the rows. That is, referring to  FIG. 10 , the secondary batteries loaded in a first column to a sixth column may be inspected sequentially, and thus the accuracy of the inspection may increase. 
     Here, the loading device  100  may further comprise a reinforcing bar  120  for reinforcing strength. The reinforcing bar  120  has an elongated bar shape, and is coupled to the loading plate  110  between the loading parts  111  corresponding to each other. Accordingly, the strength of the loading plate  110  may be reinforced. As a result, the loading plate  110  may be prevented from deforming even though the 256 secondary batteries  10  are loaded on the loading plate  110 . 
     Here, the loading device  100  may further comprise a loading body  130  for protecting edge surfaces of the loading plate  110 . That is, the loading body  130  has a quadrangular frame shape having a coupling hole defined on the top surface thereof, and the loading plate  110  is inserted into and coupled to the coupling hole. Therefore, the secondary batteries  10  loaded on the loading plate  110  may be protected against an external impact, and particularly, the loading plate  110  may be easily lifted or put down through a handle part provided in the loading body  130 . Here, the handle part may be a groove or a protrusion defined in the loading body. 
     The loading device  100  having the above constituents may stably and easily load the plurality of secondary batteries  10 . 
     Transporting Device 
     Referring to  FIGS. 1 to 4 , the transporting device  200  is for transporting the loading device on which the secondary batteries are loaded, transports the loading device  100 , which is positioned in a first section A, to a second section B in which the side portion inspecting device is positioned, transports the loading device  100 , which is positioned in the second section B, to a third section C in which the upper/lower portion inspecting device is positioned after a set time elapses, and transports the loading device  100 , which is positioned in the third section C, to a fourth section D after a set time elapses. 
     That is, the transporting device  200  transports automatically the loading device  100 , which is transported from a secondary battery manufacturing process to the first section A, to the second section B, the third section C, and the fourth section D. Therefore, the work efficiency may be increased, and the inspection time may be significantly reduced. 
     As one example, the transporting device  200  comprises: a fixing member  210  to which the loading device  100  is fixed; a transporting conveyor  220  which operates every set time and transports the fixing member  210 , to which the loading device  100  is fixed, from the first section A to the second section B, from the second section B to the third section C, and from the third section C to the fourth section D; and a control member  230  for controlling the transporting conveyor  220  to operate every set time. 
     The transporting device  200  having the above constituents may stably transport the loading device  100  on which the secondary batteries  10  are loaded, and as a result, the work efficiency may be significantly increased. 
     Side Portion Inspecting Device 
     Referring to  FIGS. 5 to 8 , the side portion inspecting device  300  is for inspecting a side portion of the secondary battery loaded on the loading device and comprises: an elevation unit  310  which lifts the secondary battery  10  loaded on the loading device  100  so as to be withdrawn out of the loading device  100  and returns to its original position after a first period of time elapses; and a side portion inspecting unit  320  which captures an image of the side portion of the secondary battery  10 , which is withdrawn out of the loading device  100  by the elevation unit  310 , thereby inspecting the side portion of the secondary battery  10 . 
     The elevation unit  310  is for withdrawing the secondary battery  10 , which is loaded on the loading device  100 , out of the loading device  100 , and comprises: a magnet  311  having a magnetic force and attached to the secondary battery  10  loaded on the loading device  100 ; an elevation body  312  to which one or more magnets  311  are coupled and which allows the one or more magnets  311  to ascend or descend; and an elevation member  313  which allows the elevation body  312  to ascend or descend so as to withdraw the secondary batteries  10 , which are attached to the magnets  311 , out of the loading device  100  or allow the secondary batteries  10  to return to its original positions. 
     The magnet  311  is attached, by the magnetic force, to the cap assembly made of metal in the secondary battery  10 . 
     Particularly, the magnet  311  comprises a detection sensor, and the detection sensor detects whether or not the secondary battery  10  is attached to the magnet  311 . 
     Here, the number of magnets  311  is equal to the number of loading parts arranged in one column among the loading parts  111  provided in the loading plate  110  (the number of loading parts arranged in the X-axis direction indicated in  FIG. 1 ), and thus the secondary batteries  10  loaded in one column among the loading parts  111  may be simultaneously lifted and withdrawn out the loading plate  110 . 
     The elevation body  312  is coupled to the magnets  311  and may allow the magnets  311  to ascend or descend. That is, the elevation body  312  may allow the plurality of magnets  311  to ascend or descend simultaneously. Particularly, the elevation body comprises a cylinder for separating the secondary battery attached to the magnet  311 , and the cylinder separates the secondary battery  10  attached to the magnet  311  when the secondary battery is returned to the original position. 
     The elevation member  313  allows the elevation body  312  to ascend or descend so as to withdraw the secondary battery  10 , which is attached to the magnet  311 , out of the loading device  100  or allow the secondary battery  10  to return to its original position. 
     In more detail, the elevation member  313  allows the elevation body  312  to ascend, thereby allowing the magnet attached to the elevation body  312  to ascend. Consequently, the secondary battery  10  attached to the magnet  311  is withdrawn out of the loading part  111  while ascending. Also, the elevation member  313  returns the magnet  311  to the original position by allowing the elevation body  312  to descend after the first period of time elapses. Consequently, the secondary battery  10  attached to the magnet  311  is returned to the original position while being loaded on the loading part  111 . Subsequently, the secondary battery  10  attached to the magnet  311  is separated by the cylinder of the elevation body  312 . 
     Here, the magnet  311  may be an electromagnet. That is, since the magnet  311  is provided as the electromagnet having the magnetic force when power is applied, the secondary battery  10  may be easily attached and separated. Particularly, the cylinder for separating the secondary battery from the magnet may be removed, and thus simplification in structure and reduction in manufacturing costs may be achieved. 
     Here, although the magnet is described as one embodiment in the present invention, any device for gripping the secondary battery to withdraw the secondary battery to the outside may be applied. 
     Here, the first period of time may change depending on the number of secondary batteries  10  loaded on a loading box. 
     The elevation unit  310  having the above constituents allows the secondary battery  10  loaded on the loading device  100  to effectively ascend or descend, and thus the secondary battery  10  may be withdrawn out of the loading device  100  or returned to the original position. 
     Here, the elevation unit  310  is provided in pair, and the pair of elevation units  310  may simultaneously withdraw the secondary batteries  10 , which are loaded in two columns among the loading parts  111  provided in the loading device  100 , out of the loading device  100 . Therefore, the work efficiency may be increased, and the work time may be significantly reduced. 
     As one example, the pair of elevation units  310  allows the sixteen secondary batteries loaded in a first column and the sixteen secondary batteries loaded in a ninth column, in the loading plate having the loading parts  111  arranged in 16 columns by 16 rows, to be simultaneously withdrawn out of the loading plate and returned to original positions. Subsequently, the sixteen secondary batteries loaded in a second column and the sixteen secondary batteries loaded in a tenth column are simultaneously withdrawn out of the loading plate and returned to original positions. With the method described above, the secondary batteries  10  loaded on the loading parts  111  arranged in 16 columns by 16 rows may be withdrawn out of the loading plate and returned to original positions. As a result, the work efficiency may be increased, and the inspection time may be reduced by half. 
     Here, the loading device  100  may further comprise a first movement unit  140  for allowing the elevation unit  310  to move so that the elevation unit  310  is positioned to the loading parts  111  in the second column and the tenth column of the loading plate  110 , when the secondary batteries loaded in the first column and the ninth column are returned to the loading plate  110 . 
     That is, the first movement unit  140  allows the loading device  100  to move at predetermined intervals, and thus the pair of elevation units  310  are sequentially positioned to the loading parts in the first column to the eighth column of the loading plate and the loading parts in the ninth column to sixteenth column, respectively. Therefore, the work efficiency may be increased. 
     Hereinafter, when describing an operation method of the elevation unit  310  in detail, the elevation body  312  is allowed to descend through the elevation member  313 , the magnets  311  coupled to the elevation body  312  are brought into contact with the top surfaces of the secondary batteries  10  loaded on the loading plate  110 . Then, power is applied to the magnets  311 , and the secondary batteries  10  are attached to the magnets  311 . Subsequently, the elevation member  313  is allowed to ascend, and thus the magnets  311  coupled to the elevation body  312  are allowed to ascend. Consequently, the secondary batteries  10  attached to the magnets  311  may be withdrawn out of the loading plate  110 . 
     Subsequently, when the inspection of the side portions of the secondary batteries  10  attached to the magnets  311  is finished, the elevation member  313  allows the elevation body  312  to descend, and the secondary batteries  10  attached to the magnets  311  are returned to the original positions on the loading parts  111  of the loading device  100  while the magnets  311  descend in association with the elevation body  312 . Then, the secondary batteries  10  attached to the magnets  311  are removed by the cylinder provided in the elevation body  312 , and the elevation body  312  and the magnets  311  are returned to the original positions by the elevation member  313 . Subsequently, the elevation unit is allowed to move at predetermined intervals by the first movement unit  140 , and positioned to the loading parts in the next column. All the secondary batteries loaded on the loading plate are withdrawn out of the loading plate by repeating the method described above. 
     The elevation unit  310  having the above constituents may allow the secondary battery  10  loaded on the loading device  100  to be easily withdrawn out of the loading device  100 . 
     The side portion inspecting unit  320  is for inspecting the side portions of the secondary batteries withdrawn out of the loading device by the elevation unit, and comprises two or more inspecting members  321  which capture images of the side portions of the secondary batteries  10 , which are attached to the magnets  311  and withdrawn out of the loading device  100 , to perform the inspection through the captured images. 
     As one example, two or more inspecting members  321  are provided corresponding to each other such that two inspecting members are on the left, and two inspecting members are on the right with respect to the elevation unit  310 . Thus, the sixteen secondary batteries  10  withdrawn out of the loading device  100  by the elevation unit  310  are divided into eight and then inspected. 
     Here, the side portion inspecting unit  320  may also capture a fluoroscopic image of the side portion of the secondary battery  10  through x-ray photography, and thus the inside of the secondary battery  10  as well as the outside thereof may be captured. As a result, it may be inspected whether or not a failure occurs inside and outside the secondary battery. That is, the side portion inspecting unit  320  may be an optical inspection device and an X-ray inspection device. 
     The side portion inspecting unit  320  having the above constituents may inspect a side portion of the electrode assembly accommodated inside the secondary battery  10  as well as the side portion of the secondary battery  10 . As a result, it may be more accurately inspected whether or not a failure occurs in the secondary battery  10 . 
     Here, the side portion inspecting device  300  may further comprise a rotation member  330  for rotating the secondary battery  10  attached to the magnet so as to more accurately inspect the entire side portion of the secondary battery attached to the magnet. 
     That is, as illustrated in  FIG. 9 , the rotation member  330  comprises: a rotary motor  331  provided with a driving pulley  331   a ; a driven pulley  332  provided between the magnet  311  and the elevation body  312  and coupling the magnet  311  to the elevation body  312  in a freely rotatable manner; and a belt  333  connecting the driving pulley  331   a  to the driven pulley  332  in a power transmissible manner and rotating the driven pulley  332  when the driving pulley  331   a  is rotated by the rotary motor  331 . 
     The rotation member  330  having the above constituents rotates the belt  333  using the rotary motor  331 , and the secondary battery  10  attached to the magnet  311  may be rotated while the magnet  311  is rotated by the belt  333 . Thus, the entire side portion of the secondary battery  10  may be exposed to the side portion inspecting member  321 . As a result, the entire side portion of the secondary battery  10  may be effectively and accurately inspected. 
     Therefore, the side portion inspecting device  300  may accurately inspect the side portions of the secondary batteries loaded on the loading device. Therefore, the work efficiency may be increased, and the inspection time may be significantly reduced. 
     Upper/Lower Portion Inspecting Device 
     As illustrated in  FIGS. 11 and 12 , the upper/lower portion inspecting device  400  is for inspecting each of upper and lower portions of the secondary battery loaded on the loading device and transported to the third section, and comprises: an upper portion inspecting member  410  for inspecting the upper portion of the secondary battery  10  loaded on the loading device  100 ; and a lower portion inspecting member  420  for inspecting the lower portion of the secondary battery  10 , which is loaded on the loading device  100 , through the through-hole  111   b  defined in the loading device  100 . 
     That is, the upper portion and the lower portion inspecting members  410  and  420  capture images of the respective upper and lower portions of the secondary battery  10  loaded on the loading device  100 , and then inspect whether or not a failure occurs by comparing the captured images and previously input images. 
     Here, the upper portion and the lower portion inspecting members  410  and  420  in a fixed state may not accurately inspect all of the secondary batteries  10  loaded on the loading device  100 . Thus, the upper/lower portion inspecting device  400  further comprises: a second movement unit  430  for moving the upper portion and lower portion inspecting members  410  and  420  in the Y-axis direction; and a third movement unit  440  for reciprocating the loading device  100  in the X-axis direction. 
     That is, the second movement unit  430  reciprocates the upper portion and lower portion inspecting members  410  and  420  in the Y-axis direction, and thus the secondary batteries loaded on the loading device  100  in the Y-axis direction may be effectively inspected. The third movement unit  440  moves the loading device  100  in the X-axis direction, and thus all of the secondary batteries arranged in the X-axis direction may be exposed to the upper portion and lower portion inspecting members  410  and  420 . As a result, all of the secondary batteries  10  loaded on the loading device  100  may be inspected. 
     Here, each of the second and third movement units  430  and  440  comprises a belt or a motor. While the belt rotates upon rotation of the motor, the upper portion and lower portion inspecting members  410  and  420  are reciprocated in the Y-axis direction, or the loading device  100  is moved in the X-axis direction. 
     Here, the upper portion and lower portion inspecting members  410  and  420  may also capture fluoroscopic images of the respective upper and lower portions of the secondary battery  10  through x-ray photography, and thus even the inside of each of the upper and lower portions of the secondary battery  10  may be captured and inspected. 
     Thus, the equipment for inspecting the secondary battery according to the first embodiment of the present invention may continuously inspect the side portions and the upper and lower portions of the secondary batteries loaded on the loading device while transporting the loading device on which the secondary batteries are loaded. Therefore, the work efficiency may be increased, and the inspection time may be significantly reduced. 
     Hereinafter, a method for inspecting a secondary battery according to a second embodiment of the present invention will be described. 
     [Method for Inspecting a Secondary Battery According to a Second Embodiment of the Present Invention] 
     A method for inspecting a secondary battery according to a second embodiment of the present invention comprises a loading step (S 10 ), a first transporting step (S 20 ), a side portion inspecting step (S 30 ), a second transporting step (S 40 ), an upper/lower portion inspecting step (S 50 ), and a discharging step (S 60 ), as illustrated in  FIG. 13 . 
     Loading Step 
     In the loading step (S 10 ), each of secondary batteries  10 , which are completed in a secondary battery manufacturing process, is loaded in an upright position on a loading device  100  positioned in a first section A. That is, in the loading step (S 10 ), the secondary battery  10  is loaded in an upright position on each of loading parts  111  provided in a loading plate  110  of the loading device  100 . Here, the loading parts  111  are arranged on the top surface of the loading plate  110  in 16 columns and 16 rows, and thus up to 256 secondary batteries  10  may be loaded on the top surface of the loading plate  110 . 
     First Transporting Step 
     In the first transporting step (S 20 ), the loading device  100  positioned in the first section A is transported to a second section B. That is, the loading device  100  positioned in the first section A is transported to the second section B by a transporting device  200 . 
     Side Portion Inspecting Step 
     In the side portion inspecting step (S 30 ), a side portion of each of the secondary batteries  10 , which are loaded on the loading device  100  and transported to the second section, is inspected. 
     That is, the side portion inspecting step (S 30 ) comprises: an elevation process (S 31 ) of lifting the secondary batteries  10  loaded on the loading device  100  so as to be withdrawn out of the loading device  100 ; a side portion inspecting process (S 32 ) of inspecting the side portions of the secondary batteries  10  withdrawn out of the loading device  100 ; and a return process (S 33 ) of returning the inspected secondary batteries  10  to their original positions as illustrated in  FIG. 14 . 
     In the elevation process (S 31 ), the secondary batteries  10  loaded on the loading device  100  are withdrawn out of the loading device  100  through an elevation unit  310 . Here, the elevation unit  310  comprises magnets  311 , an elevation body  312 , and an elevation member  313 . That is, the elevation body  312  is allowed to descend through the elevation member  313 , and the magnets  311  coupled to the elevation body  312  are brought into contact with the top surfaces of the secondary batteries  10  loaded on the loading plate  110 . Thus, the secondary batteries  10  are attached to the magnets  311 . Next, the elevation member  313  is allowed to ascend, and thus the magnets  311  coupled to the elevation body  312  are allowed to ascend. Consequently, the secondary batteries  10  attached to the magnet  311  may be withdrawn out of the loading plate  110 . 
     In the side portion inspecting process (S 32 ), the side portions of the secondary batteries are inspected through a side portion inspecting unit  320 . Here, the side portion inspecting unit  320  comprises two or more side portion inspecting members  321 . That is, the two or more side portion inspecting members  321  capture images of the side portions of the secondary batteries, which are attached to the magnets and withdrawn out of the loading device, to perform the inspection through the captured images. 
     Here, the secondary batteries attached to the magnets are rotated by a rotation member, and thus the entire side portions of the secondary batteries attached to the magnets may be exposed to the two or more side portion inspecting members  321 . As a result, the side portions of the secondary batteries may be accurately inspected. 
     In the return process (S 33 ), when the inspection of the side portions of the secondary batteries  10  attached to the magnets  311  are finished, the elevation member  313  descends, and the elevation body  312  descend in association with the elevation member  313 . The secondary batteries  10  attached to the magnets  311  are returned to the original positions on the loading parts  111  of the loading device  100  while the magnets  311  descend in association with the elevation body  312 . Next, the secondary batteries  10  attached to the magnets  311  are removed by a cylinder comprised in the elevation body  312 , and the elevation body  312  and the magnets  311  are returned to the original positions by the elevation member  313 . 
     Second Transporting Step 
     In the second transporting step (S 40 ), the loading device, on which the secondary batteries of which the side portions are inspected are loaded, is transported from the second section to a third section. That is, the loading device positioned in the second section is transported to the third section by the transporting device  200 . 
     Upper/Lower Portion Inspecting Step 
     The upper/lower portion inspecting step (S 50 ) comprises: an upper portion inspecting process (S 51 ) of inspecting an upper portion of each of the secondary batteries loaded on the loading device; and a lower portion inspecting process (S 52 ) of inspecting a lower portion each of the secondary batteries loaded on the loading device as illustrated in  FIG. 15 . 
     In the upper portion inspecting process (S 51 ), the upper portions of the secondary batteries loaded on the loading device are inspected through an upper portion inspecting member  410 . In the lower portion inspecting process (S 52 ), the lower portions of the secondary batteries loaded on the loading device are inspected through a lower portion inspecting member  420 . 
     Here, the upper portion inspecting member  410  and the lower portion inspecting member  420  capture images of the respective upper and lower portions of one or more secondary batteries loaded on the loading device to perform the inspection through the captured images. Thus, the upper and lower portions of the secondary batteries may be more accurately inspected. 
     Here, the upper/lower portion inspecting step (S 50 ) further comprises a Y-axis movement process of moving the upper portion inspecting member  410  and the lower portion inspecting member  420  in a Y-axis direction. In the Y-axis movement process, the upper portion and lower portion inspecting members  410  and  420  are moved, by a second movement unit  430 , from the secondary batteries loaded on one side of the loading device  100  in the Y-axis direction to the secondary batteries loaded on the other side. Thus, the secondary batteries loaded on the one side of the loading device  100  in the Y-axis direction to the secondary batteries loaded on the other side may be accurately inspected. 
     Also, the upper/lower portion inspecting step (S 50 ) further comprises an X-axis movement process of moving the loading device  100  in an X-axis direction. Thus, in the X-axis movement process, the secondary batteries loaded on one side of the loading device  100  in the X-axis direction to the secondary batteries loaded on the other side may be exposed, by a third movement unit, to the upper portion and lower portion inspecting members  410  and  420 . 
     Therefore, all of the secondary batteries loaded on the loading device may be accurately inspected. 
     Discharging Step 
     In the discharging step (S 60 ), when the upper/lower portion inspecting step (S 50 ) is finished, the loading device  100  positioned in the third section is transported to a fourth section through the transporting device  200 , and then the loading device  100  is discharged. 
     The scope of the present invention is defined by the appended claims rather than the detailed descriptions, and it is possible to make various embodiments derived from the meaning and scope of the claims and their equivalents concept.