Secondary battery charging and discharging device

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 the contents disclosed in the documents of the Korean patent applications are incorporated herein by reference in their entirety. The present invention relates to a charging and discharging device for a secondary battery.

Background Art

[0002] Unlike primary batteries, secondary batteries can be recharged and have been extensively researched and developed in recent years due to their potential for miniaturization and high capacity. As technology development and demand for mobile devices increase, the demand for secondary batteries as an energy source has been rapidly growing.

[0003] Secondary batteries are classified into coin-type batteries, cylindrical batteries, prismatic batteries, and pouch-type batteries according to the shape of the battery case. In a secondary battery, an electrode assembly mounted inside the battery case is a rechargeable power generation element having a laminated structure of electrodes and a separator.

[0004] The electrode assembly can be broadly classified into a jelly-roll type in which a separator is interposed between sheet-like positive and negative electrodes 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 laminated thereon are sequentially laminated, and a stack / folding type in which unit cells are wound up with a long separation film.

[0005] In the manufacturing process of a lithium-ion battery, after the battery is assembled, a device for actually charging and discharging the battery for inspection is called a charger. In a conventional charging and discharging system, charging and discharging pins are arranged at the upper and lower parts, and the upper and lower pins are brought into contact with the battery to conduct electricity for charging and discharging inspection.

[0006] In recent years, with the development of various types of batteries, the presence of an insulator at the bottom of the battery has made it impossible to perform charge / discharge tests via upper and lower pins. Therefore, there is a need for a new charging and discharging system that does not rely on upper and lower pins. [Overview of the project] [Problems that the invention aims to solve]

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

[0008] An embodiment of the present invention is a charge / discharge device for a secondary battery that energizes a cylindrical secondary battery including an electrode assembly in which a positive electrode, a separator, and a negative electrode are wound alternately, a can that houses the electrode assembly, and a positive electrode terminal located on one side of the can, and performs charging, discharging, and charge / discharge testing, and includes a charge / discharge connection portion that contacts the positive electrode terminal electrically connected to the positive electrode and the can electrically connected to the negative electrode, the charge / discharge connection portion is located in the direction of one side of the secondary battery and is electrically connected by contacting the positive electrode terminal located on one side of the secondary battery and the portion of the can. [Effects of the Invention]

[0009] According to the present invention, the charge / discharge connection section is provided so that it can be electrically connected to the secondary battery in one direction, enabling charging, discharging, and charge / discharge testing of secondary batteries of various specifications. In this case, since the positive and negative pins of the charge / discharge connection section are connected towards the top of the secondary battery, secondary batteries with an insulator located at the bottom can also be charged and discharged. Furthermore, by providing a temperature pin that contacts the battery casing at the charge / discharge connection point to measure the temperature, the temperature of the secondary battery can be easily checked during charging and discharging. [Brief explanation of the drawing]

[0010] [Figure 1] This is a front view showing a charging and discharging device for a secondary battery according to an embodiment of the present invention. [Figure 2] This is a cross-sectional view showing an example of a secondary battery to be applied to a secondary battery charging and discharging device according to an embodiment of the present invention. [Figure 3] This is a cross-sectional view showing another example of a secondary battery applied to a secondary battery charging and discharging device according to an embodiment of the present invention. [Figure 4] This is a perspective view showing the charge / discharge connection portion in a secondary battery charge / discharge device according to the first embodiment of the present invention. [Figure 5] This is a front view showing the charge / discharge connection portion in a secondary battery charge / discharge device according to the first embodiment of the present invention. [Figure 6] This is a plan view showing the charge / discharge connection portion in a secondary battery charge / discharge device according to the first embodiment of the present invention. [Figure 7] This is a perspective view showing the charge / discharge connection portion in a secondary battery charge / discharge device according to a second embodiment of the present invention. [Figure 8] This is a front view showing the charge / discharge connection portion in a secondary battery charge / discharge device according to a second embodiment of the present invention. [Figure 9] This is a plan view showing the charge / discharge connection portion in a secondary battery charge / discharge device according to a second embodiment of the present invention. [Figure 10] This is a perspective view showing the charge / discharge connection portion in a secondary battery charge / discharge device according to a third embodiment of the present invention. [Modes for carrying out the invention]

[0011] The object, particular advantages, and novel features of the present invention will become further apparent from the following detailed description and preferred embodiments relating to the accompanying drawings. It should be noted that, in this specification, when assigning reference numerals to components in each drawing, the same component will, to the greatest extent possible, have the same number even when shown in other drawings. Furthermore, 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 prior art that might unnecessarily obscure the gist of the invention will be omitted.

[0012] Charge and discharge device for secondary batteries according to the first embodiment Figure 1 is a front view showing a secondary battery charge / discharge device according to an embodiment of the present invention; Figure 2 is a cross-sectional view showing an example of a secondary battery to be applied to the secondary battery charge / discharge device according to an embodiment of the present invention; Figure 3 is a cross-sectional view showing another example of a secondary battery to be applied to the secondary battery charge / discharge device according to an embodiment of the present invention; and Figure 4 is a perspective view showing the charge / discharge connection portion in the secondary battery charge / discharge device according to the first embodiment of the present invention.

[0013] Referring to Figures 1 to 3, the secondary battery charge / discharge device 100 according to the first embodiment of the present invention is a charge / discharge device that energizes cylindrical secondary batteries 1 and 1', which include an electrode assembly 20, a can 10 housing the electrode assembly 20, and positive electrode terminals 30 and 30' located on one side of the can 10, to perform charging, discharging, and charge / discharge testing, and includes a charge / discharge connection part S that contacts the positive electrode terminals 30 and 30' electrically connected to the positive electrode 21 and the can 10 electrically connected to the negative electrode 22.

[0014] On the other hand, the secondary battery charge / discharge device 100 according to the first embodiment of the present invention may further include an upper die 170, a lower die 180, and a guide portion 190. More specifically, in the secondary batteries 1 and 1' applied to the charge-discharge device 100 for secondary batteries according to the first embodiment of the present invention, the electrode assembly 20 is a power generation element capable of charge and discharge, and the electrodes 23 and the separator 24 can be wound alternately. At this time, the electrode 23 includes a positive electrode 21 and a negative electrode 22, and the electrode assembly 20 can be formed in a columnar 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 and electrically insulates them.

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

[0016] The positive electrode active material can be composed of lithium manganese oxide, lithium cobalt oxide, lithium nickel oxide, lithium iron phosphate, or a compound and mixture containing one or more of these.

[0017] The negative electrode 22 can include a negative electrode current collector and a negative electrode active material laminated on the negative electrode current collector. The negative electrode current collector can be made of, for example, a foil of copper (Cu) material. The negative electrode active material may be a compound or mixture containing a carbonaceous material.

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

[0019] Further, the electrode assembly 20 can 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 can be electrically connected to the positive electrode terminals 30 and 30', and the negative electrode tab can be electrically connected to the can 10.

[0020] The can 10 has an open housing on one side, which can accommodate the electrode assembly 20. Here, the can 10 can be formed in a cylindrical shape with an open top and a bottom. In this case, the can can be formed in a cylindrical shape, for example, and can constitute cylindrical secondary batteries 1, 1'. The can 10 can be made of a metal material.

[0021] The positive terminals 30 and 30' can be located on one side of the can 10. In this case, for example, the positive terminals 30 and 30' can be located on the uppermost side of the can 10. The positive terminals 30, 30' are located on the upper, central side of the secondary batteries 1, 1' in the plan view, and the upper surface 11 of the can 10 is located on the outer side of the upper, outer side of the secondary batteries 1, 1'. In this case, gaskets 40, 40' made of insulating material can be provided between the positive terminals 30, 30' and the can 10.

[0022] On the other hand, the secondary battery 1 can form a cap assembly including, for example, a positive electrode terminal 30 provided in the form of a top cap, and a safety vent 50 and a safety element 60 provided below the positive electrode terminal 30. Here, the positive electrode terminals 30 and 30' can be electrically connected via the positive electrode 21 and positive electrode tab 25, and via the safety vent 50 and safety element 60 to form the positive electrode terminal 30. Here, the upper part of the can 10 surrounds the edge of the positive electrode terminal 30 in the form of a top cap, and the positive electrode terminal 30 and the can 10 can be insulated. In this case, a gasket 40 made of an insulating material can be provided between the positive electrode terminals 30 and 30' and the can 10.

[0023] On the other hand, in another example, the secondary battery 1' may have a positive electrode tab connected to the positive electrode 21 directly connected to the positive electrode terminal 30'. In this case, the positive electrode terminal 30' may be made of, for example, a rivet. A gasket 40' may be provided to insulate the positive electrode terminal 30' from the can 10.

[0024] Referring to Figure 1, the upper die 170 is located on top of the secondary batteries 1 and 1', and the charge / discharge connection part S can be attached to it. The lower die 180 can be located below the secondary battery 1, 1'.

[0025] The lower die 180 moves toward the upper die 170, allowing the positive terminals 30, 30' of the secondary batteries 1, 1' and the top of the can 10 to contact the positive pin 110 and the negative pin N, respectively. At this time, the lower die 180 can be moved vertically by a moving mechanism. Here, the moving mechanism may be, for example, a pneumatic or hydraulic actuator.

[0026] In this case, the secondary batteries 1 and 1' can be placed on the lower die 180 while housed in a tray T with an open top. This allows the tray containing the secondary batteries 1 and 1' to be moved from the lower die 180 to the upper die 170, and the tops of the secondary batteries 1 and 1' to be connected to the charge / discharge connection section S.

[0027] The guide portion 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 portion 190 can be formed in the shape of a circular rod.

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

[0029] Referring to Figures 4 to 6, the charge / discharge connection part S is located on one side of the secondary batteries 1 and 1', and can be electrically connected to the positive electrode terminals 30 and 30' located on one side of the secondary batteries 1 and 1' by contacting the can portion 10. In this case, the charge / discharge connection part S can be located on the upper side of the secondary batteries 1 and 1'.

[0030] Furthermore, the charge / discharge connection section S may include a positive electrode pin 110 that contacts the positive electrode terminals 30 and 30', and a negative electrode pin N that contacts the can 10. In addition, the charge / discharge connection section S may further include a support block 150 and a temperature pin 140.

[0031] The end of the positive pin 110 can contact the upper surface 11 of the positive terminals 30, 30', and the end of the negative pin N can contact the top of the can 10. The positive electrode pin 110 is located towards the center in the plan view, and the negative electrode pin N can be positioned on the periphery of the positive electrode pin 110 in the plan view, separated from the positive electrode pin 110 by a certain distance.

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

[0033] Therefore, by having the negative electrode pin N composed of a negative electrode current pin 120 and a 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 multiple negative electrode pins N, such as a negative electrode current pin 120 and a negative electrode voltage pin 130, the electrical resistance flowing through each negative electrode pin N is reduced, and the thickness of the negative electrode pin N can be made even thinner. This prevents the negative electrode pin N from coming into contact with the positive electrode terminals 30 and 30' and causing a short circuit.

[0034] The temperature pin 140 can contact the top of the can 10 to measure the temperature of the contact surface. The temperature pin 140 can be positioned on the periphery of the positive electrode pin 110 in the plan view, and can be positioned at 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. Furthermore, the support block 150 can be attached to the lower part of the upper die 170. In this case, the positive pin 110, the negative pin N, and the temperature pin 140 can protrude from the lower part of the support block 150.

[0036] On the other hand, the positive electrode pin 110, the negative electrode pin N, and the temperature pin 140 may each be further provided with an elastic positive electrode pin portion 111, an elastic negative electrode pin portion N1, and an elastic temperature pin portion 141 in a portion of the part that protrudes from the lower part of the support block 150. This allows the positive electrode pin 110, the negative electrode pin N, and the temperature pin 140 to absorb shock when they come into contact with the upper part of the secondary batteries 1, 1' via the elastic positive electrode pin portion 111, the elastic negative electrode pin portion N1, and the elastic temperature pin portion 141. Furthermore, when a deviation occurs in the distance between the positive electrode pin 110, the negative electrode pin N, and the temperature pin 140 and the upper part of the secondary batteries 1, 1', this deviation can be eliminated via the elastic positive electrode pin portion 111, the elastic negative electrode pin portion N1, and the elastic temperature pin portion 141.

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

[0038] The positive electrode pin elastic portion 111, the negative electrode pin elastic portion N1, and the temperature pin elastic portion 141 can be provided, for example, in the form of a coil spring. On the other hand, the negative electrode pin elastic portion N1 may include a negative electrode current pin elastic portion 121 provided on the negative electrode current pin 120 and a negative electrode voltage pin elastic portion 131 provided on the negative electrode voltage pin 130.

[0039] Referring to Figures 1 to 4, the secondary battery charge / discharge device 100 according to the first embodiment of the present invention, configured as described above, has a charge / discharge connection section S that can be electrically connected to the secondary batteries 1 and 1' in the upper direction of the secondary batteries 1 and 1', enabling charging, discharging, and charge / discharge testing of secondary batteries 1 and 1' of various specifications. In this case, since the positive electrode pin 110 and negative electrode pin N of the charge / discharge connection section S are connected in the upper direction of the secondary batteries 1 and 1', secondary batteries 1 and 1' with an insulator located at the bottom can also be charged and discharged.

[0040] Furthermore, the charge / discharge connection part S is equipped with a temperature pin 140 that contacts the can 10 of the secondary batteries 1 and 1' to measure the temperature, making it easy to check the temperature of the secondary batteries 1 and 1' during charging and discharging.

[0041] Second-Actual Charge and Discharge Device for Secondary Batteries The following describes a charging and discharging device for a secondary battery according to a second embodiment of the present invention. Figure 7 is a perspective view showing the charge / discharge connection section in a secondary battery charge / discharge device according to a second embodiment of the present invention.

[0042] Referring to Figures 2, 3, and 7, the secondary battery charge / discharge device according to the second embodiment of the present invention is a charge / discharge device that energizes cylindrical secondary batteries 1, 1' including an electrode assembly 20, a can 10 housing the electrode assembly 20, and positive electrode terminals 30, 30' located on one side of the can 10 to perform charging, discharging, and charge / discharge testing, and includes a charge / discharge 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. On the other hand, the secondary battery charge / discharge device 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, similar to the first embodiment described above (see Figure 1).

[0043] The secondary battery charge / discharge device according to the second embodiment of the present invention differs from the secondary battery charge / discharge device according to the first embodiment described above in that it further adds a configuration to adjust the positions of the negative electrode pin N and the temperature pin 140 in the charge / discharge connection part S'. Therefore, this embodiment will omit or briefly describe any content that overlaps with the previously described embodiment and will focus on describing the differences.

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

[0045] Referring to Figures 2, 3, and 7-9 for more details, the charge / discharge connection part S' is located on one side of the secondary batteries 1, 1' and can be electrically connected to the positive terminals 30, 30' located on one side of the secondary batteries 1, 1' by contacting the can portion 10. In this case, the charge / discharge connection part S' can be located on the upper side of the secondary batteries 1, 1'.

[0046] Furthermore, the charge / discharge connection section S' may include a positive electrode pin 110 that contacts the positive electrode terminals 30 and 30', and a negative electrode pin N that contacts the can 10. In addition, the charge / discharge connection section S' may further include a support block 250 and a temperature pin 140.

[0047] The end of the positive pin 110 can contact the upper surface 11 of the positive terminals 30, 30', and the end of the negative pin N can contact the top of the can 10. The positive electrode pin 110 is located towards the center in the plan view, and the negative electrode pin N can be positioned on the periphery of the positive electrode pin 110 in the plan view, separated from the positive electrode pin 110 by a certain distance.

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

[0049] The temperature pin 140 can contact the top of the can 10 to measure the temperature of the contact surface. The temperature pin 140 can be positioned on the periphery of the positive electrode pin 110 in the plan view, and can be positioned at 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 position adjustment holes 251 that extend along the width direction (W) of the support block 250.

[0051] In this configuration, 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 their positions can be adjusted by moving them along the position adjustment hole 251 in the width direction (W) of the support block 250. This allows the spacing between the negative electrode pin N and the temperature pin 140 and the positive electrode pin 110 to be adjusted, making it possible to easily charge and discharge secondary batteries of various widths.

[0052] On the other hand, the charge / discharge connection section S' in the secondary battery charge / discharge device according to the second embodiment of the present invention may further include 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 (first nut 261, second nut 262).

[0053] Multiple nuts (first nut 261, second nut 262) can be coupled to the negative electrode pin N and the temperature pin 140, respectively. In this case, threaded portions are formed along the outer circumferential surfaces of the negative electrode pin N and the temperature pin 140, and multiple nuts (first nut 261, second nut 262) with threaded grooves formed on their inner circumferential surfaces can be screw-coupled.

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

[0055] On the other hand, the positive electrode pin 110, the negative electrode pin N, and the temperature pin 140 may each be further equipped with an elastic positive electrode pin portion 111, an elastic negative electrode pin portion N1, and an elastic temperature pin portion 141 in a portion of the part that protrudes from the lower part of the support block 250. This allows the positive electrode pin 110, the negative electrode pin N, and the temperature pin 140 to absorb shock when they come into contact with the upper part of the secondary batteries 1, 1' via the elastic positive electrode pin portion 111, the elastic negative electrode pin portion N1, and the elastic temperature pin portion 141. Furthermore, when a deviation occurs in the distance between the positive electrode pin 110, the negative electrode pin N, and the temperature pin 140 and the upper part of the secondary batteries 1, 1', this deviation can be eliminated via the elastic positive electrode pin portion 111, the elastic negative electrode pin portion N1, and the elastic temperature pin portion 141.

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

[0057] The positive electrode pin elastic portion 111, the negative electrode pin elastic portion N1, and the temperature pin elastic portion 141 can be provided, for example, in the form of a coil spring. On the other hand, the negative electrode pin elastic portion N1 may include a negative electrode current pin elastic portion 121 provided on the negative electrode current pin 120 and a negative electrode voltage pin elastic portion 131 provided on the negative electrode voltage pin 130.

[0058] Charge and discharge device for secondary batteries according to the third embodiment The following describes a charging and discharging device for a secondary battery according to a third embodiment of the present invention. Figure 10 is a perspective view showing the charge / discharge connection section in a secondary battery charge / discharge device according to a third embodiment of the present invention.

[0059] Referring to Figures 2, 3, and 10, the charging and discharging device for a secondary battery according to the third embodiment of the present invention is a charging and discharging device that energizes cylindrical secondary batteries 1, 1' including an electrode assembly 20, a can 10 housing the electrode assembly 20, and positive electrode terminals 30, 30' located on one side of the can 10 to perform charging, discharging, and charging and discharging testing, and includes a charging and 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. On the other hand, the charging and 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, similar to the first and second embodiments described above.

[0060] The secondary battery charge / discharge device according to the third embodiment of the present invention differs from the secondary battery charge / discharge devices according to the first and second embodiments described above in that the charge / discharge connection section S'' consists of only one negative electrode pin N'' and one temperature pin 340. Therefore, this embodiment will omit or briefly describe any content that overlaps with the previously described embodiments and will focus on describing the differences.

[0061] Referring to Figures 2 and 10 in more detail, the charge / discharge connection part S'' is located on one side of the secondary batteries 1 and 1' and can be electrically connected to the positive terminals 30 and 30' located on one side of the secondary batteries 1 and 1' by contacting the can portion 10. In this case, the charge / discharge connection part S'' can be located on the upper side of the secondary batteries 1 and 1'.

[0062] Furthermore, the charge / discharge connection section S'' may include a positive electrode pin 110 that contacts the positive electrode terminals 30 and 30', and a negative electrode pin N'' that contacts the can 10. In addition, the charge / discharge connection section S'' may further include a support block 350 and a temperature pin 340.

[0063] The end of the positive pin 110 can contact the upper surface 11 of the positive terminals 30, 30', and the end of the negative pin N'' can contact the top of the can 10. The positive pin 110 can be located towards the center in the plan view, and the negative pin N'' can be positioned at a certain distance from the positive pin 110 in the plan view.

[0064] A single negative electrode pin N'' is provided, through which current and voltage can flow. Having only one negative electrode pin N'' occupies less space than having multiple pins, improving space utilization. A temperature pin 340 contacts the top of the can 10 to measure the temperature of the contact surface. Furthermore, the temperature pin 340 can be positioned on the plan view so as to be separated from the positive electrode pin 110 by a certain distance.

[0065] The support block 350 can support the positive pin 110, the negative pin N'', and the temperature pin 340. Furthermore, the support block 350 may further include a position adjustment hole 351 that extends along the width direction (W) of the support block 350.

[0066] In this configuration, 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 them along the position adjustment hole 351 in the width direction (W) of the support block 350. This allows the spacing between the negative electrode pin N'' and the temperature pin 340 and the positive electrode pin 110 to be adjusted, making it possible to easily charge and discharge secondary batteries of various widths.

[0067] On the other hand, the charge / discharge connection section S'' in the secondary battery charge / discharge device according to the third embodiment of the present invention may further include 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 nut 361).

[0068] Multiple nuts (first nuts 361) can be coupled to the negative electrode pin N'' and the temperature pin 340, respectively. In this case, multiple nuts (first nuts 361), each having a threaded portion formed along the outer circumferential surface of the negative electrode pin and the temperature pin, and a threaded groove formed on its inner circumferential surface, can be screw-coupled.

[0069] On the other hand, the positive electrode pin 110, the negative electrode pin N'', and the temperature pin 340 may each be further provided with elastic portions in certain sections of the part that protrudes from the lower part of the support block 350, which are elastic portions of the positive electrode pin, the negative electrode pin, and the temperature pin, respectively.

[0070] Although the present invention has been described in detail above with reference to specific embodiments, this is merely for the purpose of illustrating the present invention, and the present invention is not limited thereto. It can be said that a variety of implementations are possible within the technical concept of the present invention by those with ordinary skill in the art. Furthermore, the specific scope of protection of the invention will be clarified by the attached 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 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 electrode pin elastic part 120: Negative current pin 121: Negative electrode current pin elastic part 130: Negative voltage pin 131: Negative electrode voltage pin elastic part 140, 340: Temperature pins 141: Temperature-sensitive elastic part of pin 150, 250, 350: Support blocks 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 part T: Tray N, N'': Negative pin N1: Negative electrode pin elastic part W: width direction

Claims

1. A charge / discharge device for performing charge / discharge and charge / discharge testing of a cylindrical secondary battery, which includes an electrode assembly in which a positive electrode, a separator, and a negative electrode are wound alternately, a can that houses the electrode assembly inside, and a positive electrode terminal located on one side of the can, It includes a positive electrode terminal electrically connected to the positive electrode and a charge / discharge connection portion that contacts the can electrically connected to the negative electrode, The charge / discharge connection portion is located on one side of the cylindrical secondary battery and is electrically connected to the positive electrode terminal located on one side of the cylindrical secondary battery by contacting the portion of the can. The aforementioned charge / discharge connection part is A positive pin that contacts the aforementioned positive terminal, The can includes a negative electrode pin that contacts the can, The aforementioned positive pin is located towards the center in the plan view. The negative electrode pin is positioned on the periphery of the positive electrode pin in a plan view, at a certain distance from the positive electrode pin. The aforementioned charge / discharge connection part is The device further includes a temperature pin that contacts the top of the can to measure the temperature of the contact surface, The aforementioned charge / discharge connection part is The system further includes a support block that supports the positive electrode pin, the negative electrode pin, and the temperature pin, The support block further includes a position adjustment hole formed extending along the width direction (W) of the support block, A charging and discharging device for a secondary battery, wherein the negative electrode pin and the temperature pin are attached to the support block by passing through the position adjustment hole, and their positions are adjusted by moving along the position adjustment hole in the width direction (W) of the support block.

2. The charge / discharge connection portion is located in the upward direction of the cylindrical secondary battery, The positive terminal is located at the top of the can. The end of the positive pin contacts the upper surface of the positive terminal. The charging and discharging device for a secondary battery according to claim 1, wherein the end of the negative electrode pin is in contact with the upper part of the can.

3. The charging and discharging device for a secondary battery according to claim 1, wherein the temperature pin is located on the periphery of the positive electrode pin in a plan view and is positioned at a certain distance from the positive electrode pin.

4. The cylindrical secondary battery further includes an upper die located at the top of the cylindrical secondary battery to which the charge / discharge connection portion is attached, and a lower die located at the bottom of the cylindrical secondary battery. The charging and discharging device for a secondary battery according to claim 1, wherein the lower die moves in the direction of the upper die, and the positive electrode terminal and the upper part of the can in the cylindrical secondary battery come into contact with the positive electrode pin and the negative electrode pin, respectively.

5. The charging and discharging device for a secondary battery according to claim 4, wherein the support block is attached to the lower side of the upper die, and the positive electrode pin, the negative electrode pin, and the temperature pin protrude from the lower part of the support block.

6. The charging and discharging device for a secondary battery according to claim 5, wherein the positive electrode pin, the negative electrode pin, and the temperature pin are further provided with elastic portions of the positive electrode pin, the negative electrode pin, and the temperature pin in a portion of the portion that protrudes from the lower part of the support block.

7. The charging and discharging device for a secondary battery according to claim 6, 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 the ends of the positive electrode pin elastic portion, the negative electrode pin elastic portion, and the temperature pin elastic portion.

8. The charging and discharging device for a secondary battery according to claim 1, wherein the negative electrode pins are provided in multiple locations and include a negative electrode current pin and a negative electrode voltage pin.

9. The positive terminal and the can are insulated from each other. The charging and discharging device for a secondary battery according to any one of claims 1 to 8, wherein the positive electrode terminal is located on the central side of the upper part of the cylindrical secondary battery in a plan view, and the upper surface of the can is located on the outer side of the upper part of the cylindrical secondary battery.

10. The charge / discharge connection portion further includes fixing means for fixing the positions of the negative electrode pin and the temperature pin to the support block, according to claim 1.

11. The fastening means includes a plurality of nuts, Each of the aforementioned nuts is coupled to the negative electrode pin and the temperature pin, The secondary battery charging and discharging device according to claim 10, wherein the plurality of nuts include a first nut located on the upper surface of the support block and a second nut located on the lower surface of the support block.

12. The charging and discharging device for a secondary battery according to claim 1, comprising one positive electrode pin, one negative electrode pin, and one temperature pin.

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