Charge and discharge device for secondary battery

Abstract

The present invention relates to a charging / discharging device for a secondary battery. The charging / discharging device for a secondary battery according to the present invention is a charging / discharging device that performs charging / discharging and a charging / discharging inspection by passing an electric current through a cylindrical secondary battery including an electrode assembly in which a positive electrode, a separator, and a negative electrode are alternately wound, a can that houses the electrode assembly, and a positive electrode terminal located on one side of the can, and includes a charging / discharging connection part that contacts the positive electrode terminal electrically connected to the positive electrode and the can electrically connected to the negative electrode, and the charging / discharging connection part is located toward one side of the secondary battery and contacts and is electrically connected to the positive electrode terminal located on one side of the secondary battery and the can part.

Description

[Technical field]

[0001] This application claims the benefit of priority based on Korean Patent Application No. 10-2022-0011603 filed on January 26, 2022 and Korean Patent Application No. 10-2023-0010022 filed on January 26, 2023, and all contents disclosed in the documents of said Korean patent applications are incorporated by reference as part of this specification. The present invention relates to a charging / discharging device for a secondary battery. [Background technology]

[0002] Unlike primary batteries, secondary batteries can be recharged, and they have the potential to be small and have large capacity, so they have been the subject of much research and development in recent years. As technological development and demand for mobile devices increases, the demand for secondary batteries as an energy source is rapidly increasing.

[0003] Secondary batteries are classified into coin type batteries, cylindrical type batteries, prismatic type batteries, and pouch type batteries according to the shape of the battery case. In secondary batteries, the electrode assembly attached inside the battery case is a chargeable and dischargeable power generating element having a laminated structure of electrodes and separators.

[0004] The electrode assembly can be broadly classified into a jelly-roll type in which a separator is interposed between a sheet-like positive electrode and a sheet-like negative electrode coated with an active material and wound up, a stack type in which unit cells, each having at least one electrode and at least one separator, are sequentially stacked, and a stack / folding type in which a unit cell is wound up with a long separating film.

[0005] During the lithium-ion battery manufacturing process, a device that actually charges and discharges the battery after it is assembled and tests it is called a charger / discharger. In conventional charge / discharge systems, charge / discharge pins (PIN) are placed on the top and bottom, and charge / discharge inspection is performed by contacting the top and bottom pins with the battery and passing electricity through them.

[0006] In recent years, as various types of batteries have been developed, there are cases where charge / discharge testing through the upper and lower pins is impossible due to the presence of an insulator at the bottom of the battery. Therefore, there is a need for a new charging / discharging system that is not based on the charging / discharging system via the upper and lower pins. Summary of the Invention [Problem to be solved by the invention]

[0007] One aspect of the present invention is to provide a secondary battery charge / discharge device capable of charging / discharging secondary batteries of various specifications. [Means for solving the problem]

[0008] A charging / discharging device for a secondary battery according to an embodiment of the present invention is a charging / discharging device that performs charging / discharging and a charging / discharging inspection by passing an electric current through a cylindrical secondary battery including an electrode assembly in which a positive electrode, a separator, and a negative electrode are alternately wound, a can that houses the electrode assembly, and a positive electrode terminal located on one side of the can, and includes a charging / discharging connection part that contacts the positive electrode terminal electrically connected to the positive electrode and the can electrically connected to the negative electrode, and the charging / discharging connection part is located toward one side of the secondary battery and contacts and is electrically connected to the positive electrode terminal located on one side of the secondary battery and a portion of the can. Effect of the Invention

[0009] According to the present invention, since the charge / discharge connector is provided to be electrically connected to the secondary battery in one direction of the secondary battery, it is possible to charge / discharge and test the charge / discharge of secondary batteries of various specifications. In this case, since the positive and negative pins of the charge / discharge connector are connected to the upper direction of the secondary battery, it is possible to charge / discharge a secondary battery having an insulator located at the lower part. Furthermore, by providing the charge / discharge connection part with a temperature pin that comes into contact with the can of the secondary battery to measure the temperature, the temperature of the secondary battery can be easily checked when the secondary battery is being charged or discharged. [Brief description of the drawings]

[0010] [Figure 1] 1 is a front view showing a secondary battery charge / discharge device according to an embodiment of the present invention; [Diagram 2] 1 is a cross-sectional view showing an example of a secondary battery applied to a secondary battery charging / discharging device according to an embodiment of the present invention. [Diagram 3] 4 is a cross-sectional view showing another example of a secondary battery applied to the secondary battery charging / discharging device according to the embodiment of the present invention. FIG. [Figure 4] 1 is a perspective view showing a charge / discharge connection part in a secondary battery charge / discharge device according to a first embodiment of the present invention. FIG. [Diagram 5] 1 is a front view showing a charge / discharge connection part in a charge / discharge device for a secondary battery according to a first embodiment of the present invention. [Figure 6] FIG. 2 is a plan view showing a charge / discharge connection part in the secondary battery charge / discharge device according to the first embodiment of the present invention. [Figure 7] FIG. 6 is a perspective view showing a charge / discharge connection part in a secondary battery charge / discharge device according to a second embodiment of the present invention. [Figure 8] FIG. 6 is a front view showing a charge / discharge connection part in a charge / discharge device for a secondary battery according to a second embodiment of the present invention. [Figure 9] FIG. 6 is a plan view showing a charge / discharge connection part in a charge / discharge device for a secondary battery according to a second embodiment of the present invention. [Figure 10] FIG. 11 is a perspective view showing a charge / discharge connection part in a secondary battery charge / discharge device according to a third embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] The object, particular advantages, and novel features of the present invention will become more apparent from the following detailed description and preferred embodiments in conjunction with the accompanying drawings. In this specification, when referring to components in each drawing, it should be noted that the same components are numbered as much as possible even when they are displayed in other drawings. In addition, the present invention may be realized in various different forms, and is not limited to the embodiments described herein. In describing the present invention, detailed descriptions of related known technologies that may unnecessarily obscure the gist of the present invention will be omitted.

[0012] Secondary battery charge / discharge device according to the first embodiment FIG. 1 is a front view showing a charging / discharging device for a secondary battery according to an embodiment of the present invention, FIG. 2 is a cross-sectional view showing an example of a secondary battery applied to the charging / discharging device for a secondary battery according to an embodiment of the present invention, FIG. 3 is a cross-sectional view showing another example of a secondary battery applied to the charging / discharging device for a secondary battery according to an embodiment of the present invention, and FIG. 4 is an oblique view showing a charging / discharging connection portion in the charging / discharging device for a secondary battery according to the first embodiment of the present invention.

[0013] 1 to 3, the charging / discharging device 100 for a secondary battery according to the first embodiment of the present invention is a charging / discharging device that performs charging / discharging and a charging / discharging inspection by passing electricity through cylindrical secondary batteries 1, 1' including an electrode assembly 20, a can 10 that houses the electrode assembly 20 therein, and positive electrode terminals 30, 30' located on one side of the can 10, and includes a charging / discharging connection part S that contacts the positive electrode terminals 30, 30' electrically connected to the positive electrode 21 and the can 10 electrically connected to the negative electrode 22.

[0014] Meanwhile, the charging / discharging device 100 for a secondary battery according to the first embodiment of the present invention may further include an upper die 170, a lower die 180, and a guide unit 190. More specifically, in the secondary battery 1, 1' applied to the secondary battery charge / discharge device 100 according to the first embodiment of the present invention, the electrode assembly 20 is a power generating element capable of charging and discharging, and the electrode 23 and the separator 24 can be wound alternately. In this case, the electrode 23 includes a positive electrode 21 and a negative electrode 22, and the electrode assembly 20 can be formed in a cylindrical shape in which the positive electrode 21, the separator 24, and the negative electrode 22 are wound alternately. Here, the separator 24 separates the positive electrode 21 and the negative electrode 22 to electrically insulate them.

[0015] Positive electrode 21 can include a positive electrode current collector and a positive electrode active material laminated to the positive electrode current collector. The positive electrode current collector may be made of an aluminum foil.

[0016] The positive electrode active material may be lithium manganese oxide, lithium cobalt oxide, lithium nickel oxide, lithium iron phosphate, or a compound or mixture containing at least one of these.

[0017] The negative electrode 22 can include a negative electrode current collector and a negative electrode active material laminated to the negative electrode current collector. The negative electrode current collector may be made of, for example, a copper (Cu) foil. The negative electrode active material may be a compound or mixture that includes a graphite-based material.

[0018] The separator 24 is made of an insulating material and electrically insulates the positive electrode 21 from the negative electrode 22. Here, the separator 24 can be formed from a polyolefin resin film such as polyethylene or polypropylene having microporosity.

[0019] The electrode assembly 20 may further include a positive electrode tab 25 provided at an end of the positive electrode 21, and a negative electrode tab provided at an end of the negative electrode 22. Here, the positive electrode tab 25 may be electrically connected to positive electrode terminals 30, 30′, and the negative electrode tab may be electrically connected to the can 10.

[0020] The can 10 has a receiving portion that is open on one side and can receive the electrode assembly 20. The can 10 may be formed in a cylindrical shape with an open upper portion and a bottom surface formed on a lower portion. In this case, the can may be formed in a cylindrical shape to constitute a cylindrical secondary battery 1, 1'. The can 10 may be made of a metal material.

[0021] The positive electrode terminals 30, 30' may be located on one side of the can 10. In this case, for example, the positive electrode terminals 30, 30' may be located on the top side of the can 10. The positive electrode terminal 30, 30' may be located at the center of the upper part of the secondary battery 1, 1' in a plan view, and the upper surface 11 of the can 10 may be located at the outer side of the upper part of the secondary battery 1, 1'. In this case, a gasket 40, 40' made of an insulating material may be provided between the positive electrode terminal 30, 30' and the can 10.

[0022] Meanwhile, the secondary battery 1 may include a positive terminal 30 in the form of a top cap, a safety vent 50 provided under the positive terminal 30, and a safety element 60 to form a cap assembly. The positive terminals 30, 30' may be electrically connected to the positive electrode 21 via the positive electrode tab 25, the safety vent 50, and the safety element 60 to form the positive terminal 30. The upper part of the can 10 may surround the edge of the positive terminal 30 in the form of a top cap, and the positive terminal 30 and the can 10 may be insulated from each other. In this case, a gasket 40 made of an insulating material may be provided between the positive terminal 30, 30' and the can 10.

[0023] Meanwhile, in the secondary battery 1', as another example, a positive electrode tab connected to the positive electrode 21 may be directly connected to the positive electrode terminal 30'. In this case, the positive electrode terminal 30' may be formed, for example, by a rivet. Here, a gasket 40' for insulating the positive electrode terminal 30' from the can 10 may be provided.

[0024] Referring to FIG. 1, the upper die 170 is located on the upper part of the secondary battery 1, 1', and a charge / discharge connector S may be attached thereto. The lower die 180 may be located at the bottom of the secondary battery 1, 1'.

[0025] The lower die 180 moves toward the upper die 170, so that the positive terminals 30, 30' of the secondary batteries 1, 1' and the upper portion of the can 10 can come into contact with the positive pin 110 and the negative pin N, respectively. At this time, the lower die 180 can be moved up and down by a moving means. Here, the moving means may be, for example, a pneumatic or hydraulic actuator.

[0026] In this case, the secondary batteries 1, 1' may be placed on the lower die 180 in a state where they are accommodated in a tray T with an open top. Thus, the tray in which the secondary batteries 1, 1' are accommodated in the lower die 180 may be moved to the upper die 170, and the tops of the secondary batteries 1, 1' may be connected to the charge / discharge connection part S.

[0027] The guide part 190 is connected to the upper die 170 and the lower die 180 and can guide the movement of the lower die 180. The guide part 190 can be formed in a circular rod shape.

[0028] FIG. 5 is a front view showing the charge / discharge connection part in the secondary battery charging / discharging device according to the first embodiment of the present invention, and FIG. 6 is a plan view showing the charge / discharge connection part in the secondary battery charging / discharging device according to the first embodiment of the present invention.

[0029] 4 to 6, the charge / discharge connection part S may be located toward one side of the secondary battery 1, 1' and may be in contact with and electrically connected to the positive electrode terminal 30, 30' located on one side of the secondary battery 1, 1' and the can 10. In this case, the charge / discharge connection part S may be located toward the upper side of the secondary battery 1, 1'.

[0030] The charge / discharge connection S may also include a positive pin 110 in contact with the positive terminal 30, 30′, and a negative pin N in contact with the can 10. Furthermore, the charge / discharge connection S may further include a support block 150 and a temperature pin 140.

[0031] An end of the positive pin 110 contacts the top surface 11 of the positive terminal 30 , 30 ′, and an end of the negative pin N can contact the top of the can 10 . The positive electrode pin 110 may be located at the center in a plan view, and the negative electrode pin N may be located at the periphery of the positive electrode pin 110 at a certain distance from the positive electrode pin 110 in a plan view.

[0032] The negative pins N may be multiple and may include a negative current pin 120 and a negative voltage pin 130 . Here, the negative pin N of the charge / discharge connection part S may include one or more negative current pins 120 and one or more negative voltage pins 130. In this case, for example, the negative pin N of the charge / discharge connection part S may include three negative current pins 120 and two negative voltage pins 130.

[0033] Therefore, by configuring the negative electrode pin N with the negative electrode current pin 120 and the negative electrode voltage pin 130, the size can be reduced compared to when a single current pin and voltage pin are used. In other words, by providing a plurality of negative electrode pins N, such as the negative electrode current pins 120 and the negative electrode voltage pins 130, the resistance of the electricity flowing through each negative electrode pin N is reduced, and the thickness of the negative electrode pins N can be made thinner. This makes it possible to prevent the negative electrode pins N from coming into contact with the positive electrode terminals 30, 30' and causing a short circuit.

[0034] A temperature pin 140 is capable of contacting the top of the can 10 to measure the temperature of the contact surface. The temperature pin 140 may be located at the periphery of the positive electrode pin 110 in a plan view and spaced a certain distance apart from the positive electrode pin 110 .

[0035] The support block 150 can support the positive pin 110 , the negative pin N, and the temperature pin 140 . In addition, the support block 150 may be attached to the lower side of the upper die 170. In this case, the positive electrode pin 110, the negative electrode pin N, and the temperature pin 140 may protrude from the lower part of the support block 150.

[0036] Meanwhile, the positive pin 110, the negative pin N, and the temperature pin 140 may further include a positive pin elastic portion 111, a negative pin elastic portion N1, and a temperature pin elastic portion 141 in a portion of the portion protruding from the lower portion of the support block 150. As a result, when the positive pin 110, the negative pin N, and the temperature pin 140 contact the upper portion of the secondary battery 1, 1', impact can be absorbed through the positive pin elastic portion 111, the negative pin elastic portion N1, and the temperature pin elastic portion 141. In addition, when a deviation occurs in the distance between the positive pin 110, the negative pin N, and the temperature pin 140 and the upper portion of the secondary battery 1, 1', the deviation can be eliminated through the positive pin elastic portion 111, the negative pin elastic portion N1, and the temperature pin elastic portion 141.

[0037] The positive pin elastic portion 111, the negative pin elastic portion N1, and the temperature pin elastic portion 141 may be positioned between the support block 150 and the ends of the positive pin elastic portion 111, the negative pin elastic portion N1, and the temperature pin elastic portion 141.

[0038] The positive pin elastic portion 111, the negative pin elastic portion N1, and the temperature pin elastic portion 141 may be provided in the form of, for example, a coil spring. Meanwhile, the negative pin elastic part N1 may include a negative current pin elastic part 121 provided on the negative current pin 120 and a negative voltage pin elastic part 131 provided on the negative voltage pin .

[0039] 1 to 4, the charging / discharging device 100 for a secondary battery according to the first embodiment of the present invention configured as described above is capable of charging / discharging and testing the secondary batteries 1, 1' of various specifications by providing the charging / discharging connector S to be electrically connectable with the secondary batteries 1, 1' in the upper direction of the secondary batteries 1, 1'. In this case, the positive electrode pin 110 and the negative electrode pin N of the charging / discharging connector S are connected in the upper direction of the secondary batteries 1, 1', so that the secondary batteries 1, 1' with an insulator located below can also be charged / discharged.

[0040] Furthermore, since the charge / discharge connection part S is provided with a temperature pin 140 that contacts the can 10 of the secondary battery 1, 1' to measure the temperature, the temperature of the secondary battery 1, 1' when the secondary battery 1, 1' is being charged or discharged can be easily checked.

[0041] Secondary battery charge / discharge device according to a second embodiment Hereinafter, a secondary battery charge / discharge device according to a second embodiment of the present invention will be described. FIG. 7 is a perspective view showing a charge / discharge connection part in a secondary battery charge / discharge device according to a second embodiment of the present invention.

[0042] 2, 3, and 7, the charging / discharging device for a secondary battery according to the second embodiment of the present invention is a charging / discharging device for charging / discharging and testing a cylindrical secondary battery 1, 1' including an electrode assembly 20, a can 10 accommodating the electrode assembly 20 therein, and positive electrode terminals 30, 30' located on one side of the can 10, and includes a positive electrode terminal 30, 30' electrically connected to a positive electrode 21 and a charging / discharging connection part S' in contact with the can 10 electrically connected to a negative electrode 22. Meanwhile, the charging / discharging device for a secondary battery according to the second embodiment of the present invention may further include an upper die 170, a lower die 180, and a guide part 190, as in the first embodiment described above (see FIG. 1).

[0043] The charge / discharge device for a secondary battery according to the second embodiment of the present invention differs from the charge / discharge device for a secondary battery according to the first embodiment in that a configuration for adjusting the positions of the negative electrode pin N and the temperature pin 140 in the charge / discharge connection part S' is further added. Therefore, the present embodiment will be described mainly with respect to the differences and the contents overlapping with the above-mentioned embodiment will be omitted or briefly described.

[0044] FIG. 8 is a front view showing a charge / discharge connection part in a secondary battery charge / discharge device according to a second embodiment of the present invention, and FIG. 9 is a plan view showing a charge / discharge connection part in a secondary battery charge / discharge device according to the second embodiment of the present invention.

[0045] 2, 3, and 7 to 9, the charge / discharge connector S' may be located toward one side of the secondary battery 1, 1' and may be in contact with and electrically connected to the positive electrode terminal 30, 30' located on one side of the secondary battery 1, 1' and the can 10. In this case, the charge / discharge connector S' may be located toward the upper side of the secondary battery 1, 1'.

[0046] Additionally, the charge / discharge connection S' may include a positive pin 110 in contact with the positive terminal 30, 30', and a negative pin N in contact with the can 10. Additionally, the charge / discharge connection S' may further include a support block 250 and a temperature pin 140.

[0047] An end of the positive pin 110 contacts the top surface 11 of the positive terminal 30 , 30 ′, and an end of the negative pin N can contact the top of the can 10 . The positive electrode pin 110 may be located at the center in a plan view, and the negative electrode pin N may be located at the periphery of the positive electrode pin 110 at a certain distance from the positive electrode pin 110 in a plan view.

[0048] The negative pins N may be multiple and may include a negative current pin 120 and a negative voltage pin 130 . Here, the negative pin N of the charge / discharge connection part S' may include one or more negative current pins 120 and one or more negative voltage pins 130. In this case, for example, the negative pin N of the charge / discharge connection part S' may include three negative current pins 120 and two negative voltage pins 130.

[0049] A temperature pin 140 is capable of contacting the top of the can 10 to measure the temperature of the contact surface. The temperature pin 140 may be located at the periphery of the positive electrode pin 110 in a plan view and spaced a certain distance apart from the positive electrode pin 110 .

[0050] The support block 250 can support the positive pin 110 , the negative pin N, and the temperature pin 140 . The support block 250 may further include a position adjustment hole 251 formed to extend along the width direction (W) of the support block 250 .

[0051] In this case, the negative electrode pin N and the temperature pin 140 are attached to the support block 250 by passing through the position adjustment hole 251, and the position can be adjusted by moving in the width direction (W) of the support block 250 along the position adjustment hole 251. As a result, the distance between the negative electrode pin N and the temperature pin 140 and the positive electrode pin 110 can be adjusted, so that secondary batteries having various widths can be easily charged and discharged.

[0052] Meanwhile, the charge / discharge connector S' in the charge / discharge device for a secondary battery according to the second embodiment of the present invention may further include a fixing means 260 for fixing the positions of the negative electrode pin N and the temperature pin 140 to the support block. The fixing means 260 may include, for example, a plurality of nuts (a first nut 261, a second nut 262).

[0053] A plurality of nuts (a first nut 261, a second nut 262) can be respectively coupled to the negative electrode pin N and the temperature pin 140. At this time, a threaded portion is formed along the outer circumferential surface of the negative electrode pin N and the temperature pin 140, and a plurality of nuts (the first nut 261, the second nut 262) having a threaded groove formed on the inner circumferential surface can be screwed together.

[0054] In addition, the plurality of nuts 261, 262 may include a first nut 261 located on an upper surface of the support block 250 and a second nut 262 located on a lower surface of the support block 250. That is, the first nut 261 and the second nut 262 are respectively coupled to the negative electrode pin N and the temperature pin 140, so that the positions of the negative electrode pin N and the temperature pin 140 can be fixed to the support block 250.

[0055] Meanwhile, the positive pin 110, the negative pin N, and the temperature pin 140 may further include a positive pin elastic portion 111, a negative pin elastic portion N1, and a temperature pin elastic portion 141 in a portion of the portion protruding from the lower portion of the support block 250. As a result, when the positive pin 110, the negative pin N, and the temperature pin 140 contact the upper portion of the secondary battery 1, 1', impact can be absorbed through the positive pin elastic portion 111, the negative pin elastic portion N1, and the temperature pin elastic portion 141. In addition, when a deviation occurs in the distance between the positive pin 110, the negative pin N, and the temperature pin 140 and the upper portion of the secondary battery 1, 1', the deviation can be eliminated through the positive pin elastic portion 111, the negative pin elastic portion N1, and the temperature pin elastic portion 141.

[0056] The positive pin elastic portion 111, the negative pin elastic portion N1, and the temperature pin elastic portion 141 may be positioned between the support block 250 and the ends of the positive pin elastic portion 111, the negative pin elastic portion N1, and the temperature pin elastic portion 141.

[0057] The positive pin elastic portion 111, the negative pin elastic portion N1, and the temperature pin elastic portion 141 may be provided in the form of, for example, a coil spring. Meanwhile, the negative pin elastic part N1 may include a negative current pin elastic part 121 provided on the negative current pin 120 and a negative voltage pin elastic part 131 provided on the negative voltage pin .

[0058] Secondary battery charge / discharge device according to the third embodiment Hereinafter, a secondary battery charge / discharge device according to a third embodiment of the present invention will be described. FIG. 10 is a perspective view showing a charge / discharge connection part in a secondary battery charge / discharge device according to a third embodiment of the present invention.

[0059] 2, 3, and 10, the charging / discharging device for a secondary battery according to the third embodiment of the present invention is a charging / discharging device for performing charging / discharging and a charging / discharging inspection by passing current through a cylindrical secondary battery 1, 1' including an electrode assembly 20, a can 10 accommodating the electrode assembly 20 therein, and a positive electrode terminal 30, 30' located on one side of the can 10, and includes a positive electrode terminal 30, 30' electrically connected to a positive electrode 21 and a charging / discharging connection part S'' in contact with the can 10 electrically connected to a negative electrode 22. Meanwhile, the charging / discharging device for a secondary battery according to the third embodiment of the present invention may further include an upper die, a lower die, and a guide part, as in the first and second embodiments described above.

[0060] The charging / discharging device for a secondary battery according to the third embodiment of the present invention differs from the charging / discharging devices for a secondary battery according to the first and second embodiments described above in that the charging / discharging connection part S'' has one negative electrode pin N'' and one temperature pin 340. Therefore, in this embodiment, the contents overlapping with the above-mentioned embodiments will be omitted or described briefly, and the differences will be mainly described.

[0061] 2 and 10, the charge / discharge connector S'' may be located toward one side of the secondary battery 1, 1' and may be in contact with and electrically connected to the positive electrode terminal 30, 30' located on one side of the secondary battery 1, 1' and the can 10. In this case, the charge / discharge connector S'' may be located toward the upper side of the secondary battery 1, 1'.

[0062] Additionally, the charge / discharge connection S'' may include a positive pin 110 in contact with the positive terminal 30, 30', and a negative pin N'' in contact with the can 10. Additionally, the charge / discharge connection S'' may further include a support block 350 and a temperature pin 340.

[0063] An end of the positive pin 110 may contact the top surface 11 of the positive terminal 30 , 30 ′, and an end of the negative pin N″ may contact the top of the can 10 . The positive electrode pin 110 can be located at the center in a plan view, and the negative electrode pin N'' can be located at a certain distance from the positive electrode pin 110 in a plan view.

[0064] One negative electrode pin N'' is provided, through which current and voltage can flow. One negative electrode pin N'' is provided, which occupies less space than when multiple negative electrode pins N'' are provided, and space utilization can be improved. The temperature pin 340 is in contact with the top of the can 10 and can measure the temperature of the contact surface. Also, the temperature pin 340 can be positioned so as to be spaced a certain distance apart from the positive electrode pin 110 in a plan view.

[0065] The support block 350 may support the positive pin 110 , the negative pin N″, and the temperature pin 340 . In addition, the support block 350 may further include a position adjustment hole 351 formed to extend along the width direction (W) of the support block 350 .

[0066] In this case, the negative electrode pin N'' and the temperature pin 340 are attached to the support block 350 by passing through the position adjustment hole 351, and their positions can be adjusted by moving in the width direction (W) of the support block 350 along the position adjustment hole 351. As a result, the distance between the negative electrode pin N'' and the temperature pin 340 and the positive electrode pin 110 can be adjusted, so that secondary batteries having various widths can be easily charged and discharged.

[0067] Meanwhile, the charge / discharge connector S'' in the charge / discharge device for a secondary battery according to the third embodiment of the present invention may further include a fixing means 360 for fixing the positions of the negative electrode pin N'' and the temperature pin 340 to the support block. The fixing means 360 may include, for example, a plurality of nuts (first nuts 361).

[0068] A plurality of nuts (first nuts 361) can be respectively coupled to the negative electrode pin N'' and the temperature pin 340. At this time, a threaded portion is formed along the outer circumferential surface of the negative electrode pin and the temperature pin, and a plurality of nuts (first nuts 361) having a threaded groove formed on the inner circumferential surface can be screwed together.

[0069] Meanwhile, the positive pin 110, the negative pin N'', and the temperature pin 340 may further include a positive pin elastic portion, a negative pin elastic portion, and a temperature pin elastic portion at a portion of the protruding portion below the support block 350.

[0070] Although the present invention has been described in detail above with reference to specific embodiments, this is for the purpose of specifically explaining the present invention, and the present invention is not limited thereto. It is possible to carry out various embodiments within the technical concept of the present invention by those skilled in the art. Moreover, the specific scope of protection of the invention will become apparent from the appended claims. [Explanation of symbols]

[0071] 1, 1': Secondary battery 10: Can 11:Top surface 20: Electrode assembly 21: Positive electrode 22: Negative electrode 23: Electrode 24: Separator 25: Positive electrode tab 30, 30': Positive terminal 40, 40': Gasket 50: Safety vent 60: Safety element 100:Charging and discharging equipment for secondary batteries 110: Positive pin 111: Positive pin elastic part 120: Negative current pin 121: Negative current pin elastic part 130: Negative voltage pin 131: Negative voltage pin elastic part 140, 340: Temperature pin 141: Temperature pin elastic part 150, 250, 350: Support block 251, 351: Position adjustment hole 260, 360: Fixing means 261, 361: First nut 262: Second nut 170: Upper die 180: Lower die 190: Guide section S, S', S'': Charge / discharge connection T: Tray N, N): Negative pin N1: Negative pin elastic part W: Width direction

Claims

1. A charging / discharging device for charging / discharging and testing a cylindrical secondary battery by passing current through the battery, the battery including an electrode assembly in which a positive electrode, a separator, and a negative electrode are alternately wound, a can housing the electrode assembly therein, and a positive electrode terminal located on one side of the can, the positive electrode terminal is electrically connected to the positive electrode, and a charge / discharge connection part is electrically connected to the negative electrode and contacts the can, The charge / discharge connection part is located toward one side of the cylindrical secondary battery and contacts and electrically connects the positive electrode terminal located on one side of the cylindrical secondary battery to a portion of the can.

2. The charge / discharge connection part is A positive electrode pin in contact with the positive electrode terminal; The charging / discharging device for a secondary battery according to claim 1 , further comprising: a negative electrode pin in contact with the can.

3. the charge / discharge connection portion is located above the cylindrical secondary battery, The positive terminal is located on the top side of the can, An end of the positive electrode pin contacts an upper surface of the positive electrode terminal, The charging / discharging device for a secondary battery according to claim 2 , wherein an end of the negative electrode pin contacts an upper portion of the can.

4. The positive electrode pin is located at the center in a plan view, 3. The charging / discharging device for a secondary battery according to claim 2, wherein the negative electrode pin is located at a periphery of the positive electrode pin in a plan view so as to be spaced apart from the positive electrode pin by a certain distance.

5. The charge / discharge connection part is The charging / discharging device for a secondary battery according to claim 4 , further comprising a temperature pin that contacts the top of the can to measure the temperature of the contact surface.

6. 6. The charging / discharging device for a secondary battery according to claim 5, wherein the temperature pin is located on the periphery of the positive electrode pin in a plan view and is spaced apart from the positive electrode pin by a certain distance.

7. The charge / discharge connection part is The secondary battery charge / discharge device according to claim 5 , further comprising a support block supporting the positive electrode pin, the negative electrode pin, and the temperature pin.

8. An upper die is located at an upper portion of the cylindrical secondary battery and has the charge / discharge connector attached thereto; and a lower die is located at a lower portion of the cylindrical secondary battery, 8. The charging / discharging device for a secondary battery according to claim 7, wherein the lower die moves toward the upper die, and the positive terminal and the top of the can of the cylindrical secondary battery contact the positive pin and the negative pin, respectively.

9. 9. The charging / discharging device for a secondary battery according to claim 8, wherein the support block is attached to a lower side of the upper die, and the positive pin, the negative pin and the temperature pin protrude from a lower part of the support block.

10. 10. The charging / discharging device for a secondary battery of claim 9, wherein the positive pin, the negative pin, and the temperature pin further include a positive pin elastic portion, a negative pin elastic portion, and a temperature pin elastic portion in a portion of the positive pin, the negative pin, and the temperature pin protruding downward from the support block.

11. 11. The charging / discharging device for a secondary battery according to claim 10, wherein the positive electrode pin elastic portion, the negative electrode pin elastic portion, and the temperature pin elastic portion are located between the support block and ends of the positive electrode pin elastic portion, the negative electrode pin elastic portion, and the temperature pin elastic portion.

12. The charging / discharging device for a secondary battery according to claim 4 , wherein the negative electrode pin is provided in plurality, and includes a negative electrode current pin and a negative electrode voltage pin.

13. The positive electrode terminal is insulated from the can, The charging / discharging device for a secondary battery according to any one of claims 1 to 12, wherein the positive electrode terminal is located at the center of the upper part of the cylindrical secondary battery in a plan view, and an upper surface of the can is located at the outer shell side of the upper part of the cylindrical secondary battery.

14. The support block further includes a position adjustment hole formed to extend along a width direction (W) of the support block, 8. The charging / discharging device for a secondary battery according to claim 7, wherein the negative electrode pin and the temperature pin are attached to the support block by passing through the position adjustment hole, and the positions are adjusted by moving in the width direction (W) of the support block along the position adjustment hole.

15. 15. The charge / discharge device for a secondary battery according to claim 14, wherein the charge / discharge connection portion further includes a fixing means for fixing the positions of the negative electrode pin and the temperature pin to the support block.

16. The fastening means includes a plurality of nuts; the plurality of nuts are respectively coupled to the negative pin and the temperature pin; The charging / discharging device for a secondary battery according to claim 15 , wherein the plurality of nuts include a first nut located on an upper surface of the support block and a second nut located on a lower surface of the support block.

17. The secondary battery charge / discharge device according to claim 5 , further comprising one positive electrode pin, one negative electrode pin, and one temperature pin.

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