Impact Test Method for Cylindrical Battery Cell and Impact Test Device for Cylindrical Battery Cell For the Same

Abstract

The present invention relates to a method for impact testing of a cylindrical battery cell and an apparatus for impact testing of a cylindrical battery cell, comprising the steps of: arranging the side of a cylindrical battery cell so as to be placed on a base portion; arranging a metal rod on the upper side of the cylindrical battery cell; and dropping a weight toward the metal rod, wherein each of the two ends of the metal rod is mounted on a first guide and a second guide and is arranged on the side of the cylindrical battery cell, and a magnetic portion added to the outer surface of the metal rod is arranged to be in contact with the side of the cylindrical battery cell.

Description

Technology Field

[0001] The present invention relates to a shock test method for a cylindrical battery cell and a shock test device for a cylindrical battery cell for the same. Specifically, it relates to a shock test method and a shock test device for the same, which inspects whether a battery can explodes by applying a certain amount of impact to the side of a cylindrical battery cell. Background Technology

[0002] Lithium-ion batteries can be classified according to the shape of the battery case into cylindrical or prismatic cells, in which the electrode assembly is housed in a cylindrical or prismatic metal can, and pouch-type cells, in which the electrode assembly is housed in a pouch-type case made of aluminum laminate sheets. Among these, cylindrical cells have the advantage of relatively high capacity and structural safety.

[0003] Lithium-ion batteries can explode due to strong external impact. The casing may be physically damaged and opened by the impact. The impact may cause a short circuit inside the battery, and the reaction resulting from this short circuit may cause overheating and the generation of gas. As lithium-ion batteries are devices that store energy at high density, various tests are required to prevent safety accidents. Among these, the impact test involving dropping a heavy object is the most representative test.

[0004] The above impact test is a test in accordance with UL standards 1642 and / or 2054. It is a method in which a metal rod with a diameter of 15.8 mm is placed on the side of a cylindrical battery cell so as to be perpendicular to the central axis of the cylindrical battery cell, and a weight of 9.1 kg (about 20 pounds) is dropped from a height of 610 ± 25 mm from the battery cell onto the upper surface of the metal rod, and then the condition of the cylindrical battery cell is observed.

[0005] Impact tests are conducted on five samples, and a product is determined to be good only if all five samples do not burst. Therefore, it is highly likely that a product will be determined to be good only if an impact of the same magnitude is applied to all five samples.

[0006] The aforementioned "case of not bursting" means that the case of the cylindrical battery cell must not open. The cap assembly must not separate from the battery cell, and the side of the battery case must not be torn. The "case of bursting" includes both the case opening due to simple physical impact, and the case of the battery cell opening secondarily as a reaction resulting from damage to the internal electrode assembly caused by physical impact.

[0007] Conventionally, for the aforementioned impact test, the experiment was conducted by placing a metal rod on the side of a cylindrical battery cell and dropping a weight onto the rod. Since the side of the battery cell is curved, one end of the metal rod touches the bottom, the center contacts the side of the cell, and the other end is tilted upward. Consequently, the position where the metal rod is placed on the side of the cylindrical battery cell may vary, and differences in the degree of tilting may occur, leading to a problem where the battery cells cannot be subjected to an impact of the same magnitude.

[0008] When a weight falls onto a tilted metal rod, the part of the metal rod that is relatively higher comes into primary contact with the weight, and the impact is transmitted to this part. The part of the metal rod that is relatively lower receives a repulsive force from the weight that bounces up due to the impact from the primary contact. In this case, the impact force from the weight may not be fully transmitted to the cylindrical battery cell. Additionally, it may be difficult to maintain a constant magnitude of the impact force applied to the cylindrical battery cell.

[0009] Therefore, an impact test method and an impact test device capable of increasing the accuracy and reliability of the impact test are required.

[0010] Patent Document 1 discloses an impact test device for a battery cell in which, when a second driving unit is lowered toward the upper part of a cylindrical battery cell, an impact unit provided at the lower part of the second driving unit presses against one side of the battery cell.

[0011] Patent Document 1 uses a method of calculating the distance from a second driving unit to the bottom surface of a chamber in which a cylindrical battery cell is placed using a laser sensor, and adjusts the height of the second driving unit according to the distance measurement result of the laser sensor. Accordingly, it is possible to repeatedly press one side of the cylindrical battery cell, and the precision and reliability of the experiment can be improved.

[0012] Patent Document 1 discloses a method of applying a constant impact when performing an impact test on the cap assembly portion of a cylindrical battery cell, but does not provide a method of applying a constant impact to the side of the cylindrical battery cell.

[0013] Patent Document 2 is a method different from UL Standards 1642 and / or 2054, comprising two shafts and a round bar that can be driven up and down along said shafts. A recessed rail may be configured on the shafts. In the case of Patent Document 2, it differs from international standard methods as it is based on the dropping of the round bar, and there is a problem in that the impact force is reduced or changed due to the frictional force of the round bar moving along said shafts.

[0014] As such, when conducting an impact test to check for explosion by impacting the side of a cylindrical battery cell according to international standards, there is a need for a method and device that can prevent the metal rod from detaching due to the weight and increase the reliability of the impact test by applying an impact of the same magnitude even when the test is repeated multiple times. Prior art literature

[0015] Republic of Korea Published Patent Application No. 2014-0000398 (2014.01.03) ('Patent Document 1') Republic of Korea Registered Patent Application No. 2132980 (2020.07.06) ('Patent Document 2') The problem to be solved

[0016] The present invention aims to solve the above-mentioned problems by providing a method for impact testing of a cylindrical battery cell and an apparatus for impact testing of a cylindrical battery cell, wherein the contact state between the metal rod and the cylindrical battery cell is maintained during an impact test in which the side of the cylindrical battery cell is impacted, so that the impact of the weight is applied directly to the cylindrical battery cell. means of solving the problem

[0017] A shock test method for a cylindrical battery cell according to the present invention for achieving the above-mentioned purpose comprises the steps of: arranging the side of the cylindrical battery cell so that it rests on a base portion; arranging a metal rod on the upper side of the cylindrical battery cell; and dropping a weight toward the metal rod, wherein a magnetic portion added to the outer surface of the metal rod may be arranged to contact the side of the cylindrical battery cell.

[0018] Each of the two ends of the metal rod can be positioned on the upper side of the cylindrical battery cell while mounted on the first guide and the second guide.

[0019] The central axis of the metal rod and the central axis of the cylindrical battery cell can be arranged to be orthogonal to each other.

[0020] The magnetic part may be formed on a portion of the outer surface of the longitudinal center of the metal rod.

[0021] The method may further include a step of adjusting the positions of both ends of the metal rod in the first guide and the second guide so that the distance from each end of the metal rod to the base part is constant.

[0022] A first guide moving part and a second guide moving part are provided at each end of the metal rod so that the metal rod can move up and down while maintaining a horizontal state, and each of the first guide moving part and the second guide moving part can move up and down along the inside of the first guide and the second guide.

[0023] The state in which the magnetic part of the metal rod and the side of the cylindrical battery cell are in contact can be maintained throughout the entire process of the step in which the weight falls onto the metal rod.

[0024] In an impact test device for a cylindrical battery cell for an impact test method of the above-mentioned cylindrical battery cell, the device comprises a base portion on which a cylindrical battery cell is disposed on an upper surface, a metal rod disposed on the side of the cylindrical battery cell, and a weight falling toward the metal rod, and a magnetic portion may be provided at the center of the metal rod.

[0025] A first guide and a second guide may be provided, each mounted on both ends of the metal rod and adjusting the height of the metal rod.

[0026] The first and second guides may have scales formed thereon to check the height of the metal rod.

[0027] A first guide moving part and a second guide moving part are provided at each end of the metal rod so that the metal rod can move up and down while maintaining a horizontal state, and each of the first guide moving part and the second guide moving part can move up and down along the inside of the first guide and the second guide.

[0028] The first guide and the second guide include an upper and lower adjustment unit for adjusting the height of the metal rod, and the upper and lower adjustment unit may be configured in the form of a long bolt positioned on the upper part of the metal rod.

[0029] The first guide and the second guide include an upper and lower adjustment unit for adjusting the height of the metal rod, and the upper and lower adjustment unit may have an elastic member disposed on the upper part of the metal rod and an adjustment unit for adjusting the length of the elastic member on the upper part of the elastic member.

[0030] A spirit level may be located on the outer surface of the above metal rod.

[0031] The above metal rod may be in the shape of a cylinder or a polygonal column.

[0032] The above magnetic part may be configured such that a permanent magnet or an electromagnet is attached to the outer surface of a metal rod.

[0033] The above base portion may include the above cylindrical battery cell mounting portion.

[0034] The present invention can also be provided in a form that combines various means for solving the above problem. Effects of the invention

[0035] As explained above, in the present invention, even if the weight falls on the metal rod, the contact state between the cylindrical battery cell and the metal rod is maintained, so the magnitude of the impact force transmitted from the weight to the metal rod can be transmitted to the cylindrical battery cell without loss.

[0036] In addition, since the weight is dropped while the metal rod is positioned on the upper side of the cylindrical battery cell in a state parallel to the base, the magnitude of the impact applied to the cylindrical battery cell can be kept constant even with repeated experiments. Brief explanation of the drawing

[0037] FIG. 1 is a perspective view of an impact test device for a cylindrical battery cell according to a first embodiment of the present invention. Figure 2 is an enlarged perspective view of the metal rod of Figure 1. Figure 3 is a vertical cross-section according to AA of Figure 2. Figure 4 is a perspective view of the metal rod of Figure 2 with a spirit level added. FIG. 5 is a perspective view of a base portion in which a cylindrical battery cell mounting portion is formed. FIG. 6 is a perspective view of an impact test device for a cylindrical battery cell according to a second embodiment of the present invention. FIG. 7 is a perspective view of a metal rod according to the third embodiment of the present invention. Figure 8 is a vertical cross-section according to XX of the metal rod of Figure 7. Figure 9 is a vertical cross-section of the metal rod of Figure 8 along YY. Specific details for implementing the invention

[0038] Embodiments that enable a person skilled in the art to easily practice the present invention are described in detail below with reference to the attached drawings. However, in describing the operating principles of preferred embodiments of the present invention in detail, if it is determined that a specific description of related known functions or configurations may unnecessarily obscure the essence of the present invention, such detailed description is omitted.

[0039] In addition, the same reference numerals are used for parts having similar functions and operations throughout the drawings. Throughout the specification, when a part is described as being connected to another part, this includes not only cases where they are directly connected, but also cases where they are indirectly connected with other elements in between. Furthermore, unless specifically stated otherwise, the inclusion of a certain component does not exclude other components but implies that additional components may be included.

[0040] Furthermore, descriptions that specify components by limiting or adding them may be applied to all inventions unless specifically limited, and are not limited to descriptions of specific inventions.

[0041] In addition, throughout the description of the invention and claims of this application, items indicated in the singular include cases where they are plural unless otherwise noted.

[0042] In addition, throughout the description of the invention and the claims of the present invention, "or" includes "and" unless otherwise noted. Therefore, "comprising A or B" means all three of the above cases: including A, including B, or including both A and B.

[0043] The present invention is described in detail with reference to the drawings and embodiments.

[0044] In all embodiments of the present invention, the metal rod, weight, and drop height of the weight used may be a metal rod with a diameter of 15.8 mm according to international standards, a weight weighing 9.1 kg (about 20 pounds), and a height of 610 ± 25 mm from the battery cell.

[0045] In the case of the 18650 cylindrical battery, the diameter is 18 mm, so it may be in the shape of a cylinder with a diameter similar to that of the 15.8 mm metal rod mentioned above; however, the cylindrical battery cell, metal rod, and weight in FIGS. 1 to 9 are schematically depicted with some parts emphasized rather than in proportion to their actual shapes. In the case of the weight as well, since it must be approximately 100 mm in width, length, and height, its volume is actually larger than that of the 18650 cylindrical battery.

[0046] In addition, the part for fixing the weights illustrated in FIGS. 1 to 9 is an example, and any form is acceptable as long as it is a device capable of dropping the weights from a certain height. Various variations are possible, such as a form in which the weights are fixed using a ring and then dropped, a form in which they are placed on a stand and then pushed to drop, or a form in which they are fixed by an electromagnet and then dropped.

[0047] FIG. 1 is a perspective view of an impact test device for a cylindrical battery cell according to a first embodiment of the present invention, FIG. 2 is an enlarged perspective view of a metal rod of FIG. 1, and FIG. 3 is a vertical cross-section according to AA of FIG. 2.

[0048] Referring to FIGS. 1 to 3, the impact test device for a cylindrical battery cell according to the present invention comprises a base part (100) on which a cylindrical battery cell (10) is placed on an upper surface, a metal rod (300) placed on the upper side of the cylindrical battery cell (10), a first guide (210) and a second guide (220) mounted on each end of the metal rod (300) to adjust the height of the metal rod (300), and a weight (400) that falls toward the metal rod (300).

[0049] Each of the two ends of the metal rod (300) is mounted on the first guide (210) and the second guide (220) and positioned on the side of the cylindrical battery cell (10), such that the central axis of the metal rod (300) and the central axis of the cylindrical battery cell (10) are positioned to be orthogonal to each other.

[0050] A form in which the first guide (210) and the second guide (220) are omitted is also possible, which is simpler than the first embodiment of the present invention. In this case, the metal rod (300) can be in a shape where the side of the battery cell is curved, as in the conventional method, so that one end of the metal rod contacts the base part (100), the center contacts the side of the cylindrical battery cell (10), and the other end is inclined toward the top. As described below, if the magnetic part (310) of the metal rod (300) is strong, the metal rod (300) can maintain a horizontal position even if the first guide (210) and the second guide (220) are omitted.

[0051] The present invention relates to an impact test method for determining whether a cylindrical battery cell (10) bursts when a weight (400) is dropped toward the contact portion between the cylindrical battery cell (10) and the metal rod (300) while the side of the cylindrical battery cell (10) is placed on a base portion (100) and a metal rod (300) is placed on the side or upper side of the cylindrical battery cell (10). If the cylindrical battery cell (10) bursts, it is determined to be a defective battery cell, and if the cylindrical battery cell (10) does not burst, it is determined to be a normal battery cell.

[0052] It is desirable that the metal rod (300) remains in contact with the side of the cylindrical battery cell (10) so that when the weight (400) and the metal rod (300) collide, the metal rod (300) does not bounce up or move, and the weight (400) in contact with the cylindrical battery cell (10) is not moved, so that the magnitude of the impact caused by the gravity of the weight (400) is fully transmitted to the cylindrical battery cell (10).

[0053] Accordingly, the present invention can maintain a contact state between the metal rod (300) and the cylindrical battery cell (10) by adding a magnetic part (310) to at least a part of the outer surface of the metal rod (300) by magnetic force.

[0054] For example, the magnetic portion (310) may be added to the entire outer surface of the metal rod (300), or the magnetic portion (310) may be formed on a part of the outer surface of the longitudinal center of the metal rod (300).

[0055] In the case where a magnetic portion (310) is added to the entire outer surface of the metal rod (300), when placing the metal rod (300) on the side of the cylindrical battery cell (10), the position of the magnetic portion (310) formed on the metal rod (300) does not need to be considered, and even if the metal rod (300) attached to the outer surface of the cylindrical battery cell (10) is attached in a tilted shape, or even if the part of the metal rod (300) that contacts the cylindrical battery cell (10) is a part that is off-center from the metal rod (300), contact between the metal rod (300) and the cylindrical battery cell (10) can be maintained during the impact test.

[0056] When a magnetic portion (310) is added to a portion of the outer surface of the longitudinal center of the metal rod (300), if a contact surface is formed between the maximum protrusion of the side of the cylindrical battery cell (10) and the magnetic portion (310) while the side of the cylindrical battery cell (10) is laid down so that it is placed on the base portion (100), the equilibrium of the metal rod (300) can be maintained around the contact surface, and the distance from each end of the metal rod (300) to the base portion (100) can be kept constant. In addition, if the magnetic portion (310) is sufficiently strong, the metal rod (300) can maintain a horizontal position even if the first guide (210) and the second guide (220) are omitted. Therefore, even if impact tests are conducted on multiple samples by changing the cylindrical battery cell (10), the magnitude of the impact applied to the metal rod (300) can be kept constant.

[0057] When a magnetic part (310) is added to a part of the outer surface of the metal rod (300), no step or groove is formed between the surface of the magnetic part (310) and the surface of the metal rod (300) surrounding the magnetic part (310), and in the cross-section of the metal rod (300) as in FIG. 3, the diameter of the metal rod (300) where the magnetic part (310) is located is formed to be the same as the diameter of the metal rod (300) where the magnetic part (310) is not located.

[0058] For example, the magnetic part (310) may be configured such that a permanent magnet or an electromagnet is added to the outer surface of a metal rod.

[0059] Although the shape of the metal rod in FIGS. 1 to 3 is illustrated as being configured in a cylindrical shape, the shape of the metal rod described in the present invention is not limited to a cylindrical shape, and the present invention also includes a metal rod configured in a polygonal column shape.

[0060] The base part (100) may be in the form of a vertical center axis and a horizontal center axis as indicated by the dotted line in FIG. 1, and the position of the weight (400) and the cylindrical battery cell (10) can be adjusted so that the point of impact of the weight (400) and the part for applying impact to the cylindrical battery cell (10) are placed at the intersection (C) of the vertical center axis and the horizontal center axis.

[0061] The two ends of the metal rod (300) can be mounted on the first guide (210) and the second guide (220). By positioning the metal rod (300) so that its center is placed on the side of the cylindrical battery cell (10) placed on the base part (100) and pressing the two ends of the metal rod (300) from top to bottom with a uniform force, the metal rod (300) and the base part (100) can be made parallel. In this way, the first guide (210) and the second guide (220) can adjust the position of the two ends of the metal rod (300) so that the distance from each of the two ends of the metal rod (300) to the base part (100) is constant.

[0062] In order to visually check the height of the metal rod (300) from the base part (100), the first guide (210) and the second guide (220) have a first scale (215) formed on the side of the first guide (210) and a second scale (225) formed on the side of the second guide (220).

[0063] In the first embodiment, the first guide (210) and the second guide (220) each include a first vertical adjustment part and a second vertical adjustment part for adjusting the height of the metal rod (300).

[0064] The first vertical adjustment unit is configured such that a first bolt (211) is positioned to pass through the upper end (214) of the first guide, and the lower end of the first bolt (211) is in contact with the metal rod (300). The height of the first bolt (211) can be adjusted using a screwdriver or wrench that fits the groove or screw head on the upper end (213) of the first bolt (211) to level the metal rod (300). The second vertical adjustment unit is configured such that a second bolt (221) is positioned to pass through the upper end (224) of the second guide, and the lower end of the second bolt (221) is in contact with the metal rod (300). The height of the second bolt (221) can be adjusted using a screwdriver or wrench that fits the groove or screw head on the upper end (223) of the second bolt (221) to level the metal rod (300).

[0065] In this way, the metal rod (300) can be parallel to the base part (100) by means of the first bolt (211) and the second bolt (221). At this time, when the weight (400) is dropped, the metal rod (300) can be prevented from tilting or bouncing, and the impact force applied by the weight (400) to the metal rod (300) can be transmitted directly to the cylindrical battery cell (10) without being lost.

[0066] FIG. 4 is a perspective view of the metal rod (300) of FIG. 2 with a level added to it.

[0067] Referring to FIG. 4, a form in which a level (320) is placed on the outer surface of a metal rod (300) is illustrated. Since the impact test device for a cylindrical battery cell according to the present invention has a first scale and a second scale marked on each of the first guide and the second guide, the height of both ends of the metal rod can be set equally. However, as shown in FIG. 4, when a level (320) is additionally added, the metal rod can be leveled by referring to the level (320).

[0068] FIG. 5 is a perspective view of a base portion in which a cylindrical battery cell mounting portion is formed.

[0069] Referring to FIG. 5, the base portion (100) may include a mounting portion (110) having a groove formed that corresponds to the outer surface of the cylindrical battery cell (10) so that the lower part of the cylindrical battery cell (10) can be accommodated.

[0070] When an impact test is conducted by dropping a weight while at least a portion of the lower part of the cylindrical battery cell (10) is received in the mounting part (110), the phenomenon of the cylindrical battery cell (10) bouncing due to the impact of the weight can be prevented. However, since results different from international standards may occur depending on whether the mounting part (110) is mounted, the mounting part (110) may be additionally added if statistically consistent results are observed.

[0071] FIG. 6 is a perspective view of an impact test device for a cylindrical battery cell according to a second embodiment of the present invention.

[0072] Referring to FIG. 6, in the impact test device for a cylindrical battery cell according to the second embodiment, the first guide (410) and the second guide (420) each include a first vertical adjustment part and a second vertical adjustment part for adjusting the height of the metal rod (300).

[0073] The first vertical adjustment unit includes a first elastic member (412) positioned on the upper part of the metal rod (300) and a first adjustment unit (411) coupled to the upper part of the first elastic member (412) to adjust the length of the first elastic member (412). Additionally, a first gripper (413) formed in a semi-cylindrical shape is coupled to the lower part of the first elastic member (412) to wrap around a portion of the outer surface of the metal rod (300), which is formed in a cylindrical structure. If the metal rod (300) is formed in a polygonal column shape, the shape of the first gripper (413) may be configured to correspond to the polygonal column shape so as to closely wrap around a portion of the outer surface of the polygonal column shape. By providing a first gripper (413) configured in such a shape, the metal rod (300) can be effectively pressed without limitation on the shape of the metal rod (300).

[0074] The second upper and lower adjustment unit includes a second elastic member (422) positioned on the upper part of the metal rod (300) and a second adjustment unit (421) coupled to the upper part of the second elastic member (422) to adjust the length of the second elastic member (422). Additionally, a second gripper (423) formed in a semi-cylindrical shape is coupled to the lower part of the second elastic member (422) to wrap around a portion of the outer surface of the metal rod (300), which is formed in a cylindrical structure.

[0075] The first elastic member (412) and the second elastic member (422) may be, for example, springs, and the first elastic member (412) and the second elastic member (422) may be pressed by the first adjustment part (411) and the second adjustment part (421) so that the metal rod (300) is in close contact with the first gripper (413) and the second gripper (423), and the metal rod (300) and the cylindrical battery cell (10) may be in close contact.

[0076] The description of the second gripper (423) in the second upper / lower adjustment section can be applied in the same way as the description of the first gripper (413).

[0077] FIG. 7 is a perspective view of a metal rod according to a third embodiment of the present invention, FIG. 8 is a vertical cross-section of the metal rod of FIG. 7 according to XX, and FIG. 9 is a vertical cross-section of the metal rod of FIG. 8 according to YY.

[0078] Referring to FIGS. 7 to 9, the metal rod (300) according to the third embodiment includes a metal rod body (301) and a first guide moving part (321) and a second guide moving part (322) that are coupled to each of the two ends of the metal rod body (301).

[0079] The first guide moving part (321) is positioned in a space formed inside the first guide (510) and can move up and down within the space, and the second guide moving part (322) is positioned in a space formed inside the second guide (520) and can move up and down within the space.

[0080] The metal rod (300) according to the third embodiment includes a first guide moving part (321) and a second guide moving part (322), and since it moves up and down in a direction perpendicular to the base part along the space formed within the first guide (510) and the second guide (520), the metal rod (300) can move up and down while maintaining a horizontal state relative to the base part.

[0081] In addition, although not shown in FIG. 7, it is obvious that the vertical movement unit shown in FIG. 1 and FIG. 6 can be applied as a means to move the first guide movement unit (321) and the second guide movement unit (322) in the vertical direction.

[0082] Additionally, although not shown in FIG. 7, the magnetic part may be formed on the entire outer surface of the metal rod body (301), or may be added only to the lower surface of the center of the metal rod body (301).

[0083] Since the first guide moving part (321) and the second guide moving part (322) include a flat upper surface, when a long bolt is used as an elastic member, the contact surface in contact with the lower surface of the long bolt can be formed as a plane parallel to the base part. Therefore, since it is possible to apply pressure with a uniform force over the entire contact surface, the pressure of the metal rod can be applied stably and effectively.

[0084] In this way, when using the present invention, the contact state between the metal rod and the cylindrical battery cell can be stably maintained, so that the magnetic part of the metal rod and the side of the cylindrical battery cell can be maintained in contact throughout the entire process of the weight falling onto the metal rod, thereby preventing the problem in which the force of the weight is not fully transmitted to the cylindrical battery cell due to the bouncing of the metal rod when the weight is pressed.

[0085] In addition, since the weight is dropped while the metal rod is positioned horizontally, the magnitude of the impact applied to the cylindrical battery cell can be kept constant when the weight and position of the weight are kept constant, thereby improving the reliability of the impact test. As such, the impact test method for a cylindrical battery cell and the impact test device for a cylindrical battery cell according to the present invention provide consistent results compared to the prior art.

[0086] A person skilled in the art to which the present invention pertains would be able to perform various applications and modifications within the scope of the present invention based on the above content. Explanation of the symbols

[0087] 10: Cylindrical battery cell 100: Base section 110: Mounting part 210, 410, 510: First Guide 211: Chapter 1 Bolt 213: Chapter 1 Top of the Bolt 214, 414: Top of Guide 1 215: 1st scale 220, 420, 520: Second Guide 221: Chapter 2 Bolt 223: Chapter 2 Top of the Bolt 224, 424: Top of Guide 2 225: Second scale 300: Metal rod 301: Metal rod body 310: Self-nature 320: Level 321: 1st Guide Moving Part 322: 2nd Guide Movement Section 400: Weight 411: First control unit 412: First elastic member 413: 1st Gripper 421: Second control unit 422: Second elastic member 423: 2nd Gripper C: Intersection

Claims

Claim 1 A method for impact testing of a cylindrical battery cell comprises: a step of arranging the side of the cylindrical battery cell so as to be placed on a base portion; a step of arranging a metal rod on the upper side of the cylindrical battery cell; and a step of dropping a weight toward the metal rod; wherein a magnetic portion added to the outer surface of the metal rod is arranged to be in contact with the side of the cylindrical battery cell, and a first guide and a second guide are provided, each mounted on both ends of the metal rod and adjusting the height of the metal rod, and the first guide and the second guide include an upper and lower adjustment portion for adjusting the height of the metal rod, wherein the upper and lower adjustment portion has an elastic member arranged on the upper part of the metal rod and an adjustment portion for adjusting the length of the elastic member on the upper part of the elastic member. Claim 2 delete Claim 3 A method for impact testing of a cylindrical battery cell according to claim 1, wherein the central axis of the metal rod and the central axis of the cylindrical battery cell are arranged to be orthogonal to each other. Claim 4 In claim 1, the magnetic part is formed on a portion of the outer surface of the longitudinal center of the metal rod in a shock test method for a cylindrical battery cell. Claim 5 A method for impact testing of a cylindrical battery cell according to claim 1, further comprising the step of adjusting the positions of both ends of the metal rod in the first guide and the second guide so that the distance from each end of the metal rod to the base portion is constant. Claim 6 A method for impact testing of a cylindrical battery cell according to claim 1, wherein a first guide moving part and a second guide moving part are provided at each end of the metal rod so that the metal rod can move up and down while maintaining a horizontal state, and each of the first guide moving part and the second guide moving part moves up and down along the inside of the first guide and the second guide. Claim 7 A method for impact testing of a cylindrical battery cell according to claim 1, wherein the state in which the magnetic part of the metal rod and the side of the cylindrical battery cell are in contact is maintained throughout the entire process of the step in which the weight is dropped onto the metal rod. Claim 8 An impact test device for a cylindrical battery cell according to any one of claims 1 and 3 to 6, comprising: a base portion on which a cylindrical battery cell is disposed on an upper surface; a metal rod disposed on the side of the cylindrical battery cell; and a weight falling toward the metal rod; wherein a magnetic portion is provided at the center of the metal rod. Claim 9 delete Claim 10 In claim 8, the first guide and the second guide are an impact test device for a cylindrical battery cell having a scale formed thereon for checking the height of the metal rod. Claim 11 In claim 8, a first guide moving part and a second guide moving part are provided at each end of the metal rod so that the metal rod can move up and down while maintaining a horizontal state, and each of the first guide moving part and the second guide moving part moves up and down along the inside of the first guide and the second guide, respectively, in a shock test device for a cylindrical battery cell. Claim 12 In claim 8, the first guide and the second guide include an upper and lower adjustment unit for adjusting the height of the metal rod, and the upper and lower adjustment unit is configured in the form of a long bolt positioned on the upper part of the metal rod, forming an impact test device for a cylindrical battery cell. Claim 13 delete Claim 14 In claim 8, an impact test device for a cylindrical battery cell in which a spirit level is located on the outer surface of the metal rod. Claim 15 In claim 8, the metal rod is a shock test device for a cylindrical battery cell in the form of a cylinder or a polygonal column. Claim 16 In claim 8, the above magnetic part is configured in a form in which a permanent magnet or an electromagnet is attached to the outer surface of a metal rod, forming a shock test device for a cylindrical battery cell. Claim 17 In claim 8, the base portion is an impact test device for a cylindrical battery cell including the cylindrical battery cell mounting portion.

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