Secondary battery

Abstract

A secondary battery is disclosed. According to one aspect of this disclosure, a secondary battery is provided, comprising: a can having an opening; an electrode assembly having a first hollow portion and disposed inside the can; a cover for closing the opening; and an electrode rod extending through the first hollow portion, the electrode rod comprising: a first end portion exposed outside the can to form an electrode terminal; and a second end portion corresponding to the first end portion.

Description

Technical Field

[0001] Embodiments of this disclosure relate to a secondary battery. Background Technology

[0002] A secondary battery is an energy storage device that can be charged and discharged through an electrochemical reaction. Secondary batteries are widely used in various fields that utilize electrical energy. For example, they are widely used in mobile devices such as mobile phones, laptops, and tablets, and their applications are being explored in transportation vehicles such as vehicles, aircraft, and ships. Furthermore, the demand for secondary batteries in Energy Storage Systems (ESS) that utilize surplus electricity is also increasing.

[0003] Secondary batteries can be categorized by their packaging form, including pouch-shaped, prismatic, cylindrical, and button-shaped batteries. Among these, cylindrical secondary batteries, with their standardized dimensions and ease of mass production, have seen rapid growth in demand in recent years, particularly in the automotive sector. Cylindrical secondary batteries can be formed by housing an electrode assembly, known as a jelly roll, along with the electrolyte in a container. Furthermore, the electrode assembly can be provided by winding the positive and negative electrodes, separated by a separator, into a roll. Utility Model Content

[0004] (a) Technical problems to be solved

[0005] Embodiments of this disclosure may provide a secondary battery.

[0006] In addition, some embodiments of this disclosure can provide a secondary battery that can be packaged into a cylindrical shape.

[0007] In addition, some embodiments of this disclosure can provide a secondary battery with improved cooling performance.

[0008] In addition, some embodiments of this disclosure can provide a secondary battery with improved structural stability.

[0009] Some embodiments of this disclosure can be widely applied to green technology fields such as electric vehicles, battery charging stations, and other battery-powered solar and wind power generation. Additionally, some embodiments of this disclosure can be used in eco-friendly electric vehicles and hybrid vehicles to prevent climate change by suppressing air pollution and greenhouse gas emissions.

[0010] (II) Technical Solution

[0011] According to one aspect of this disclosure, a secondary battery may be provided, comprising: a can having an opening; an electrode assembly having a first hollow portion and disposed inside the can; a cover plate for closing the opening; and an electrode rod extending through the first hollow portion, the electrode rod comprising: a first end portion exposed outside the can to form an electrode terminal; and a second end portion located on the opposite side corresponding to the first end portion.

[0012] In some embodiments, the can is arranged in a cylindrical shape with a predetermined diameter and height, and may form another electrode terminal corresponding to the electrode rod.

[0013] In some embodiments, the electrode assembly may include: a first electrode tab disposed on one side of the electrode assembly and electrically connected to the electrode rod; and a second electrode tab disposed on the opposite side to the first electrode tab and electrically connected to the can.

[0014] In some embodiments, the first end may be electrically insulated from the can by a first washer.

[0015] In some embodiments, the electrode rod may include an insertion region disposed inside the first hollow section, the insertion region may have a first diameter, and the first end may have a second diameter greater than the first diameter.

[0016] In some embodiments, after the electrode rod is inserted into the first hollow cavity, the first end may be deformed by pressure to have the second diameter.

[0017] In some embodiments, the second end may be electrically insulated from the cover plate by a second washer.

[0018] In some embodiments, the second end may be exposed outside the cover plate.

[0019] In some embodiments, the electrode rod may include an insertion region disposed inside the first hollow section, the insertion region may have a first diameter, and the second end may have a third diameter greater than the first diameter.

[0020] In some embodiments, the second end can be disposed at a predetermined interval from the setting reference plane.

[0021] In some embodiments, the first end may be supported on the outer surface of the can, and the second end may be supported on the outer surface of the cover.

[0022] In some embodiments, the can may include: a first surface, wherein the first end is disposed on the first surface; and a second surface extending from the first surface, the second surface being formed as a curved surface without beading.

[0023] In some embodiments, at least a portion of the electrode rod may be formed of a conductive material.

[0024] In some embodiments, the electrode rod may include an insertion region disposed inside the first hollow space, and the insertion region may be provided with an insulating portion for insulating the electrode rod and the electrode assembly.

[0025] In some embodiments, the insulating portion may include at least one of an insulating coating and an insulating sleeve disposed on the outer surface of the insertion region.

[0026] In some embodiments, the electrode rod may be configured to transfer heat generated from and transferred to the first hollow portion of the electrode assembly to the first end and the second end.

[0027] In some embodiments, the electrode rod may be formed from a solid shaft, and at least one of the first end and the second end may be provided with a flange that may protrude around the outer side of the first end or the second end and be radially deformed by pressure after the electrode rod is inserted into the first hollow.

[0028] In some embodiments, the electrode rod may be formed from a hollow shaft having a second hollow portion, which may extend from the first end to the second end and pass through the electrode rod.

[0029] (III) Beneficial Effects

[0030] Embodiments of this disclosure may provide a secondary battery.

[0031] Some embodiments of this disclosure can provide a secondary battery that can be packaged into a cylindrical shape.

[0032] In addition, some embodiments of this disclosure can properly dissipate heat from inside the tank to the outside to improve cooling performance.

[0033] In addition, some embodiments of this disclosure can provide suitable support structures for the electrode assembly to improve structural stability. Attached Figure Description

[0034] Figure 1 This is a schematic perspective view of a secondary battery according to an embodiment of the present disclosure.

[0035] Figure 2 yes Figure 1 The diagram shows a schematic cross-sectional view of a secondary battery.

[0036] Figure 3 yes Figure 2 A schematic perspective view of the electrode assembly shown.

[0037] Figure 4 yes Figure 3 A schematic cross-sectional view of the electrode rod shown.

[0038] Figure 5 It is shown Figure 2 A schematic cross-sectional view of another embodiment of the electrode rod shown.

[0039] Figure 6 It is shown Figure 2 A schematic cross-sectional view of another embodiment of the electrode rod shown.

[0040] Figure 7A and Figure 7B yes Figure 2 The diagram shows a schematic assembly process flow for a secondary battery.

[0041] Explanation of reference numerals in the attached figures:

[0042] 100: Secondary battery; 110: Can

[0043] 120: Electrode assembly; 130: Cover plate

[0044] 140: Electrode rod Detailed Implementation

[0045] The present disclosure will now be described in detail with reference to the accompanying drawings. However, these are merely exemplary embodiments, and the present disclosure is not limited to the specific implementations described herein.

[0046] Figure 1 This is a schematic perspective view of a secondary battery according to an embodiment of the present disclosure.

[0047] For ease of explanation, the following will use... Figure 1 Using the coordinate axes shown in the image as a reference, the X-axis is called the left-right direction, the Y-axis is called the front-back direction, and the Z-axis is called the up-down direction. Additionally, [the text abruptly ends here, likely due to an incomplete sentence or missing information]. Figure 1 The direction of rotation P1 centered on the central axis C1 is called the circumferential direction, and the direction P2 from the central axis C1 toward the outer surface of the secondary battery is called the radial direction.

[0048] Reference Figure 1In some embodiments, the secondary battery 100 may be arranged in a cylindrical shape with a predetermined diameter D1 and height H1. For example, the secondary battery 100 may have a diameter of 46 mm and a height of 80 mm. Depending on the circumstances, a secondary battery 100 with this form factor may be referred to as a "4680 battery". In another example, the secondary battery 100 may have a diameter of 46 mm and a height of 80 mm, or a diameter of 46 mm and a height of 95 mm, or a diameter of 46 mm and a height of 110 mm. Depending on the circumstances, a secondary battery 100 with this form factor may be referred to as a "46xx battery". The "xx" in "46xx" may indicate the height of the corresponding form factor. In yet another example, the secondary battery 100 may have a diameter of 48 mm and a height of 75 mm, or a diameter of 48 mm and a height of 80 mm, or a diameter of 48 mm and a height of 110 mm. Depending on the circumstances, a battery with this form factor may be referred to as a "48xx battery". The "xx" in "48xx" may indicate the height of the corresponding form factor. However, in this disclosure, the diameter D1 and height H1 of the secondary battery 100 can be varied and are not necessarily limited to the examples described above.

[0049] On the other hand, although this description shows a cylindrical secondary battery 100, the size specifications of the secondary battery 100 according to embodiments of this disclosure are not necessarily limited to the above example. The secondary battery 100 according to embodiments of this disclosure can be implemented or applied in various forms, such as button-shaped, prismatic, pouch-shaped, and other non-general shapes, within the scope of the technical ideas described below.

[0050] On the other hand, in the illustrated embodiment, the cylindrical secondary battery 100 may have a central axis C1. The central axis C1 may be configured as an axis passing through the center of the secondary battery 100 in the vertical direction. As described above, in this description, the circumferential direction and radial direction are defined and referred to based on the central axis C1.

[0051] Figure 2 yes Figure 1 The diagram shows a schematic cross-sectional view of a secondary battery.

[0052] Reference Figure 2 In some embodiments, the secondary battery 100 may include: a can 110 having an opening 113; an electrode assembly 120 having a first hollow section 124 and disposed inside the can 110; a cover 130 closing the opening 113; and an electrode rod 140 extending through the first hollow section 124. The electrode rod 140 may include: a first end 141 exposed outside the can 110 to form an electrode terminal; and a second end 142 located on the opposite side to the first end 141.

[0053] Specifically, in some embodiments, the secondary battery 100 may include a canister 110. The canister 110 may form the overall appearance of the secondary battery 100. In addition, the canister 110 may provide internal space for housing the electrode assembly 120.

[0054] In some embodiments, the can 110 may be cylindrical with a predetermined diameter D1 and height H1. Additionally, the can 110 may have a first surface 111 and a second surface 112. The first surface 111 may be located at one end of the can 110 along the central axis C1, and the second surface 112 may surround the interior of the can 110 and extend circumferentially. In other words, based on the illustration, the first surface 111 corresponds to the upper surface 111 of the can 110, and the second surface 112 corresponds to the side surface 112 of the can 110. For ease of explanation, the first surface 111 will be referred to as the upper surface 111, and the second surface 112 as the side surface 112. On the other hand, the lower end of the can 110 may be open to provide an opening 113, and the opening 113 may be closed by a cover plate 130.

[0055] On the other hand, in some embodiments, the can 110 may be electrically connected to the electrode assembly 120 to form another electrode terminal corresponding to the electrode rod 140. For example, in the illustrated embodiment, the electrode rod 140 may function as the positive terminal, and the can 110 may function as the negative terminal.

[0056] On the other hand, in some embodiments, the secondary battery 100 may include an electrode assembly 120. The electrode assembly 120 may be disposed inside the tank 110. In some embodiments, the electrode assembly 120 may be provided with a first electrode 121 and a second electrode 122 disposed separated by a separator 123. The first electrode 121 may be a positive electrode or a negative electrode, and the second electrode 122 may be a negative electrode or a positive electrode corresponding to the first electrode. For ease of explanation, in this description, it is assumed that the first electrode 121 is a positive electrode and the second electrode 122 is a negative electrode.

[0057] In some embodiments, the first electrode 121 may include a positive current collector and a positive electrode mixture layer. For example, the positive current collector may comprise aluminum, stainless steel, nickel, titanium, and alloys thereof. On the other hand, the positive electrode mixture layer may be disposed on at least one side of the positive current collector. The positive electrode mixture layer may comprise a positive electrode active material, which may comprise a compound capable of reversibly intercalating and deintercalating lithium ions. For example, the positive electrode active material may comprise a lithium-nickel metal oxide, which, depending on the circumstances, may further comprise cobalt, manganese, aluminum, etc.

[0058] In some embodiments, the second electrode 122 may include a negative electrode current collector and a negative electrode mixture layer. For example, the negative electrode current collector may contain copper, stainless steel, nickel, titanium, and alloys thereof. On the other hand, the negative electrode mixture layer may be disposed on at least one side of the negative electrode current collector. The negative electrode mixture layer may contain a negative electrode active material, which may contain a compound capable of reversibly inserting and deintercalating lithium ions. For example, the negative electrode active material may contain carbon-based materials such as crystalline carbon, amorphous carbon, carbon composites, and carbon fibers. Alternatively, the negative electrode active material may contain lithium metal, lithium alloys, silicon-containing materials, tin-containing materials, etc.

[0059] A diaphragm 123 may be disposed between the first electrode 121 and the second electrode 122. The diaphragm 123 may be configured to restrict an electrical short circuit between the first electrode 121 and the second electrode 122 and to generate ion flow. In some embodiments, the diaphragm 123 may include a porous polymer membrane, a porous nonwoven fabric, etc. For example, the porous polymer membrane may contain polyolefin-based polymers such as ethylene polymers, propylene polymers, ethylene / butene copolymers, ethylene / hexene copolymers, ethylene / methacrylate copolymers, etc. Additionally, the porous nonwoven fabric may contain high-melting-point glass fibers, polyethylene terephthalate fibers, etc.

[0060] Figure 3 yes Figure 2 A schematic perspective view of the electrode assembly shown.

[0061] Reference Figure 3 In some embodiments, the electrode assembly 120 may be configured as a cylindrical roll formed by winding the first electrode 121, the second electrode 122, and the diaphragm 123 around a central axis C1. This type of rolled electrode assembly 120 may be referred to in the art as a jelly roll, etc.

[0062] In some embodiments, the electrode assembly 120 may be provided with a first electrode tab 121a. The first electrode tab 121a may be provided at one end of the positive electrode current collector where the positive electrode mixture layer is omitted. In the illustrated embodiment, the first electrode tab 121a is provided at the upper end of the first electrode 121. In some embodiments, multiple first electrode tabs 121a may be provided. Multiple first electrode tabs 121a may be provided at the upper end of the first electrode 121, along the winding direction of the first electrode 121. In addition, multiple first electrode tabs 121a may be bent toward the central axis C1. The bent multiple first electrode tabs 121a may form a first mating surface 121b at the upper end of the electrode assembly 120. The first mating surface 121b may be configured as a schematic surface formed by the bent multiple first electrode tabs 121a.

[0063] On the other hand, in some embodiments, a first hollow section 124 may be provided at the center of the electrode assembly 120. The first hollow section 124 may extend vertically through the center of the electrode assembly 120. Alternatively, the first hollow section 124 may be provided inside the can 110 corresponding to the central axis C1.

[0064] Refer again Figure 2 In some embodiments, the electrode assembly 120 may be provided with a second electrode tab 122a. The second electrode tab 122a may be provided at the end of the negative electrode current collector where the negative electrode mixture layer is omitted. In the illustrated embodiment, the second electrode tab 122a is provided at the lower end of the second electrode 122. Similar to the first electrode tab 121a described above, in some embodiments, multiple second electrode tabs 122a may be provided. In addition, multiple second electrode tabs 122a may be bent toward the central axis C1 to form a second mating surface 122b at the lower end of the electrode assembly 120.

[0065] On the other hand, in some embodiments, the first electrode tab 121a can be electrically connected to the electrode rod 140. Therefore, a portion of the electrode rod 140 can function as an electrode terminal. For example, in the illustrated embodiment, the first electrode 121 is exemplarily a positive electrode, and the electrode rod 140 is electrically connected to the first electrode tab 121a, thereby functioning as a positive terminal. In some embodiments, the first electrode tab 121a can be electrically connected to the electrode rod 140 via a current collector 161. The current collector 161 is joined to the first mating surface 121b by welding or the like, thereby enabling electrical connection to the first electrode tab 121a. Additionally, the current collector 161 is joined to the electrode rod 140 by welding or the like, thereby enabling electrical connection to the electrode rod 140.

[0066] On the other hand, in some embodiments, the second electrode tab 122a can be electrically connected to the can 110. Therefore, a portion of the can 110 can function as another electrode terminal corresponding to the aforementioned electrode rod 140. For example, in the illustrated embodiment, the second electrode 122 is an example of a negative electrode, and the can 110 is electrically connected to the second electrode tab 122a, thus functioning as a negative terminal. In some embodiments, the second electrode tab 122a can be electrically connected to the can 110 via a cover plate 130. The cover plate 130 is joined to the second mating surface 122b by welding or the like, thereby enabling electrical connection to the second electrode tab 122a. Additionally, the cover plate 130 is joined to the can 110 by welding or the like, thereby enabling electrical connection to the can 110.

[0067] Although not shown, in some embodiments, the second electrode tab 122a may also be electrically connected to the can 110 via a current collector. In this case, the current collector may be joined between the second electrode tab 122a and the can 110 by welding or the like. Additionally, the cover plate 130 may be configured to be electrically insulated from the can 110.

[0068] On the other hand, in some embodiments, the secondary battery 100 may include a cover plate 130. The cover plate 130 may be configured to close the opening 113 at the lower end of the can 110. Thus, the can 110 can be properly closed internally by the upper electrode rod 140 (i.e., the first end 141) and the lower cover plate 130 while the electrode assembly 120 is internally housed.

[0069] On the other hand, in some embodiments, the secondary battery 100 may include an electrode rod 140. The electrode rod 140 may extend through a first hollow section 124 disposed in the electrode assembly 120. That is, the electrode rod 140 may extend vertically through the first hollow section 124 along its length. The electrode rod 140 may be provided with a first end 141 and a second end 142. The first end 141 refers to one end of the electrode rod 140 along its length, and the second end 142 refers to the opposite end corresponding to the first end 141. In the illustrated embodiment, the first end 141 is disposed at the upper end of the electrode rod 140, and the second end 142 is disposed at the lower end of the electrode rod 140.

[0070] In some embodiments, the first end 141 may be exposed to the outside of the can 110. Alternatively, the exposed first end 141 may form an electrode terminal. For example, in the illustrated embodiment, the electrode rod 140 is electrically connected to the first electrode tab 121a, and the first end 141 is exposed to the upper surface 111 of the can 110. Therefore, the exposed first end 141 may form a positive terminal corresponding to the first electrode tab 121a.

[0071] In some embodiments, the first end 141 can be electrically insulated from the can 110 by a first washer 151. The first washer 151 is disposed between the upper end region of the electrode rod 140 on which the first end 141 is provided and the upper surface 111 of the can 110, thereby electrically insulating the first end 141 from the can 110. Therefore, the electrode rod 140 can be electrically insulated from the can 110.

[0072] On the other hand, in some embodiments, the second end 142 may be exposed outside the cover plate 130. The exposed second end 142 can serve as a support structure for the cover plate 130. In the illustrated embodiment, the second end 142 is exposed to the bottom surface of the cover plate 130, supporting the bottom surface of the cover plate 130 between itself and the first end 141. Therefore, the load or external force acting on the cover plate 130 can be distributed to the upper surface 111 of the tank 110 through the second end 142 and the first end 141.

[0073] Similar to the first end 141 described above, in some embodiments, the second end 142 can be electrically insulated from the cover plate 130 by a second washer 152. The second washer 152 is disposed between the lower end region of the electrode rod 140 with the second end 142 and the cover plate 130, thus electrically insulating the second end 142 from the cover plate 130. Therefore, the electrode rod 140 can be electrically insulated from the cover plate 130 or the can 110.

[0074] On the other hand, in some embodiments, the second end portion 142 may be disposed apart from the setting reference surface S1 by a predetermined interval G1. The setting reference surface S1 may be defined as a plane corresponding to the lowermost end of the secondary battery 100. That is, the setting reference surface S1 may be defined as a plane corresponding to the support surface of the secondary battery 100. In the illustrated embodiment, the setting reference surface S1 is set as an XY plane corresponding to the lower end of the can 110 or the lower end of the cover plate 130. The second end portion 142 may be disposed apart from the setting reference surface S1 by a predetermined interval G1 to be electrically insulated from the setting reference surface S1 or the support surface.

[0075] Figure 4 yes Figure 3 A schematic cross-sectional view of the electrode rod is shown.

[0076] Reference Figure 4In some embodiments, the electrode rod 140 may have an insertion region AR1 and an exposure region AR2 along its length. The insertion region AR1 may be located inside the first hollow 124. That is, the insertion region AR1 may be a portion of the electrode rod 140 located inside the first hollow 124 along its length. In the illustrated embodiment, the insertion region AR1 is located over most of the remaining portion of the electrode rod 140, excluding the two end portions (exposure regions AR2). On the other hand, the exposure region AR2 may expose the portion located outside the first hollow 124. That is, the exposure region AR2 may be the remaining portion of the electrode rod 140 located outside the first hollow 124 along its length. The exposure regions AR2 may be located at the upper and lower ends of the electrode rod 140, respectively.

[0077] In some embodiments, the insertion region AR1 may have a first diameter D2. The first diameter D2 may correspond to the inner diameter of the first hollow 124, or be smaller than the inner diameter of the first hollow 124 by a predetermined degree. Therefore, the electrode rod 140 can be properly inserted and secured to the first hollow 124. Conversely, in some embodiments, the first end 141 may have a second diameter D3 that is a predetermined degree larger than the first diameter D2. That is, the first end 141 may have a diameter D3 that is a predetermined degree larger than the insertion region AR1. Therefore, the first end 141 can be properly supported on the upper surface 111 of the can 110. In addition, connection space for connecting the manifold, etc., to the first end 141 can be appropriately ensured.

[0078] In some embodiments, after the electrode rod 140 is inserted and secured to the first hollow 124, the first end 141 can be deformed by pressure to have a second diameter D2. Specifically, the first end 141 can have a first diameter D2 corresponding to the insertion region AR1 in its initial state. Additionally, the electrode rod 140 can be inserted and secured to the first hollow 124 in the aforementioned initial state. Next, the first end 141 can be deformed by pressure. For example, the first end 141 can be caulking. Therefore, the first end 141 can be deformed radially to have a second diameter D3.

[0079] Similar to the first end described above, in some embodiments, the second end 142 may have a third diameter D4 that is a predetermined size larger than the first diameter D1. The third diameter D4 may be formed the same as or different from the second diameter D3 described above. In the illustrated embodiment, the second diameter D3 and the third diameter D4 are shown to be formed identically. Based on the third diameter D4, the second end 142 may suitably support the bottom surface of the cover plate 130. That is, the cover plate 130 may be supported by the second end 142 to prevent detachment from the electrode rod 140.

[0080] As described above, the electrode rod 140 can be supported between the can 110 and the cover plate 130 via a first end 141 and a second end 142. That is, the first end 141 can be configured to be supported from below by the upper surface 111 of the can 110, and the second end 142 can be configured to be supported on the bottom surface of the cover plate 130. Therefore, the arrangement of the electrode assembly 120 and the like inside the can 110 can be provided with a more stable support structure. In addition, external forces concentrated at the joint between the can 110 and the cover plate 130 can be distributed to the upper surface 111 of the can 110 and the like.

[0081] In some embodiments, the support structure of the electrode rod 140 described above can simplify the structure of the can 110. For example, the support structure of the electrode rod 140 described above can replace the existing beading provided on the side 112 of the can 110 to assist in supporting the electrode assembly 120. For reference, the beading described above refers to a structure in the form of a recessed groove provided at the lower end of the side 112 of the can 110 to fix and assist in supporting the internal electrode assembly 120. In some embodiments, the support structure of the electrode rod 140 can replace the function of the beading described above, and the side 112 of the can 110 can be provided as a smooth curved surface that omits the beading described above.

[0082] On the other hand, in some embodiments, at least a portion of the electrode rod 140 may be made of a conductive material. For example, the electrode rod 140 may be formed entirely of a metal material such as steel or aluminum. Therefore, the first end 141 of the electrode rod 140 may suitably function as an electrode terminal.

[0083] In some embodiments, at least a portion of the electrode rod 140 may be made of a thermally conductive material. For example, the electrode rod 140 may be formed entirely of a metal material such as steel or aluminum. This electrode rod 140 can dissipate heat generated by the electrode assembly 120, etc. Specifically, the heat generated by the electrode assembly 120, etc., can be transferred from inside the can 110 to the first hollow 124, and the heat transferred to the first hollow 124 can move along the electrode rod 140, thereby being transferred to the first end 141 and the second end 142 disposed outside the can 110. Therefore, the heat generated inside the can 110 can be effectively dissipated to the outside. In addition, the electrode rod 140 made of a thermally conductive material such as metal can further facilitate this heat dissipation operation.

[0084] On the other hand, in some embodiments, the electrode rod 140 may be provided with an insulating portion 143. The insulating portion 143 can be used to insulate the electrode rod 140 from the electrode assembly 120. Specifically, as described above, the electrode rod 140 may be provided with an insertion region AR1 disposed inside the first hollow 124, and the insulating portion 143 may be disposed in the region including such an insertion region AR1. The insulating portion 143 can be implemented in various ways. For example, the insulating portion 143 may be implemented in the form of an insulating coating applied to the outer surface of the insertion region AR1. Alternatively, the insulating portion 143 may be implemented in the form of an insulating sleeve fastened to the outer surface of the insertion region AR1. The insulating sleeve is provided in the form of a tube or the like, and can be fastened to the outer surface of the insertion region AR1 by means of adhesion, pressing, or the like. In some embodiments, the insulating sleeve may be provided in the form of a heat-shrinkable tube or the like, which is tightly attached to the outer surface of the insertion region AR1 by a heating device.

[0085] Figure 5 It is shown Figure 2 A schematic cross-sectional view of another embodiment of the electrode rod shown.

[0086] For ease of explanation, the following description focuses on the differences from the embodiments described above. (Refer to...) Figure 5 In some embodiments, the end of the electrode rod 240 may be provided with a flange 244. The flange 244 may be provided in at least one of the first end 241 and the second end 242. In the illustrated embodiment, the flange 244 is provided in both the first end 241 and the second end 242.

[0087] The flange 244 can be provided in the same or similar manner at the first end 241 and the second end 242. Taking the first end 241 as an example, the flange 244 can be formed by projecting upwards around the outer periphery of the first end 241. This flange 244 can surround the central space 244a and is provided in a circular sleeve shape. In addition, the flange 244 can also be provided in the same or similar manner at the second end 242. On the other hand, the electrode rod 240 can be provided in the form of a solid shaft filled in the remaining area except for the two end areas.

[0088] In some embodiments, the flange 244 described above can be deformed by radial pressure. Specifically, the flange 244 can be prepared in a state where it protrudes around the outer periphery of the first end 241, and the electrode rod 240 can be inserted and secured to the first hollow 124 in this state. Furthermore, when the electrode rod 240 is properly inserted and positioned, the flange 244 can be pressurized by a predetermined processing device. For example, the upper end of the flange 244 can be pressurized by a pressing machine, or the flange 244 can be pressurized by a processing tool disposed in the space 244a. Therefore, the flange 244 can be deformed radially and pressed tightly against the first washer 151. Additionally, the first end 241 can be formed into an electrode terminal in the form of a flat metal sheet as described in the above embodiment. Although the description is omitted, this operation can also be similarly implemented in the second end 242.

[0089] Figure 6 It is shown Figure 2 A schematic cross-sectional view of another embodiment of the electrode rod shown.

[0090] Reference Figure 6 In some embodiments, the electrode rod 340 may be configured as a hollow shaft with a second hollow portion 345 internally. The second hollow portion 345 may extend along the length of the electrode rod 340 from a first end 341 to a second end 342. The upper region of this electrode rod 340 adjacent to the first end 341 can function similarly to the flange 244 in the above embodiments. That is, the upper region where the second hollow portion 345 is formed is radially deformed by pressure, thereby forming an electrode terminal similar to that in the above embodiments. Similarly, the lower region adjacent to the second end 342 can also be radially deformed by pressure.

[0091] In the electrode rod 340 described above, a second hollow portion 345 can pass vertically through the electrode rod 340. In some embodiments, this second hollow portion 345 can be filled with a filler having thermal or electrical conductivity. Alternatively, although not shown, in other embodiments, a pin-shaped fixing member can be inserted into and secured to the second hollow portion 345. The fixing member can be provided from a base plate or the like on which the secondary battery is mounted. In this case, heat transferred to the second hollow portion 345 can be transferred to the base plate or the like through the fixing member. In addition, multiple fixing members can be pre-installed in the base plate or the like to guide the mounting of the secondary battery and assist in securing the secondary battery.

[0092] Figure 7A and Figure 7B yes Figure 2 The diagram shows a schematic assembly process flow for a secondary battery.

[0093] The following is based on Figure 2 The assembly method is illustrated using the secondary battery 100 shown as an example. The assembly method described later can also be applied in the same or similar way. Figure 5 and Figure 6 The secondary battery is shown. However, in the embodiments of this disclosure, the assembly method of the secondary battery is not necessarily limited to the assembly method described later. In some embodiments, the secondary battery may also be manufactured by an assembly method different from that described later.

[0094] Reference Figure 7A Prepare electrode assembly 120, and insert electrode rod 140 into the first hollow section. For reference, and for ease of illustration, in Figure 7A and Figure 7B In the image, the electrode assembly 120 described above is shown flipped upside down. That is, in... Figure 7A In the electrode assembly 120, the first electrode tab 121a is disposed on the lower side, and the second electrode tab 122a is disposed on the upper side. The electrode rod 140 can be fastened to the electrode assembly 120 so that the insertion area is located inside the first hollow part.

[0095] Next, the current collector 161 can be fastened. The current collector 161 can be joined to the first electrode tab 121a by welding or the like. Alternatively, the current collector 161 can be joined to the electrode rod 140 by welding or the like. Depending on the situation, the current collector 161 can also be pre-fastened to the electrode assembly 120 before the electrode rod 140 is inserted.

[0096] Next, the assembly including electrode assembly 120, electrode rod 140, and manifold 161 can be inserted into can 110. The assembly can be inserted into the interior of can 110 through opening 113. When inserting the assembly, the first end 141 of electrode rod 140 can be exposed through the upper surface (lower side in the figure) of can 110. In addition, a first washer 151 can be fastened between electrode rod 140 and can 110.

[0097] Reference Figure 7B Next, the first end 141 can be deformed under pressure. The first end 141 can be deformed radially to a predetermined degree to form a positive terminal on the upper surface (lower side in the figure) of the can 110. Additionally, the first gasket 151 can be tightly fitted between the first end 141 and the upper surface (lower side in the figure) of the can 110. Furthermore, electrolyte or the like can be injected into the can 110 through the opening 113.

[0098] Next, the cover plate 130 can be fastened to the lower end (upper end in the attached drawing) of the can 110 to close the opening 113. Additionally, the cover plate 130 can engage with the second electrode tab 122a. Depending on the situation, the cover plate 130 can engage with the second electrode tab 122a via a heat source provided by its outer surface (upper surface of the cover plate 130 in the attached drawing) while the second electrode tab 122a is in place. Furthermore, a second washer 152 can be fastened between the electrode rod 140 and the cover plate 130.

[0099] Next, the second end 142 can be deformed under pressure. Similar to the first end 141 described above, the second end 142 can be deformed under pressure in the radial direction to press into and fix it to the outer surface of the cover plate 130. In addition, the second washer 152 can be tightly attached between the second end 142 and the cover plate 130.

[0100] As described above, embodiments of this disclosure can provide a secondary battery.

[0101] In some embodiments of this disclosure, the electrode assembly can be housed inside a cylindrical can and encapsulated into a cylindrical shape. Additionally, in some embodiments of this disclosure, due to improvements in the support structure of the electrode assembly, it can also be suitably applied to larger cylindrical secondary batteries.

[0102] Additionally, in some embodiments of this disclosure, an electrode rod may be provided that passes through the electrode assembly, and a portion of the electrode rod may be exposed outside the can. This electrode rod serves as an electrode terminal and also as a heat dissipation device to dissipate heat from inside the can to the outside. Therefore, the cooling performance of the secondary battery can be improved.

[0103] Furthermore, in some embodiments of this disclosure, the aforementioned electrode rod can serve as a support structure for the cover plate or electrode assembly. Therefore, the structural stability of the secondary battery can be improved. Additionally, in some embodiments of this disclosure, this electrode rod can eliminate the rolled edges formed in existing cans. Therefore, the manufacturing convenience of the secondary battery can be improved.

[0104] The above description is merely an example of applying the principles of this disclosure, and other configurations may be included without departing from the scope of this disclosure.

Claims

1. A secondary battery, characterized in that, include: The can has an opening; An electrode assembly having a first hollow section is disposed inside the can; Cover plate, to close the opening; as well as The electrode rod extends through the first hollow cavity. The electrode rod includes: The first end is exposed to the outside of the can to form an electrode terminal; as well as The second end is located on the opposite side to the first end.

2. The secondary battery according to claim 1, characterized in that, The can is arranged in a cylindrical shape with a predetermined diameter and height, and forms another electrode terminal corresponding to the electrode rod.

3. The secondary battery according to claim 1, characterized in that, The electrode assembly includes: A first electrode tab is disposed on one side of the electrode assembly and electrically connected to the electrode rod; and The second electrode tab is disposed on the opposite side to the first electrode tab and is electrically connected to the tank.

4. The secondary battery according to claim 1, characterized in that, The first end is electrically insulated from the can by a first washer.

5. The secondary battery according to claim 1, characterized in that, The electrode rod includes an insertion region, which is disposed inside the first hollow section. The insertion region has a first diameter. The first end has a second diameter that is larger than the first diameter.

6. The secondary battery according to claim 5, characterized in that, After the electrode rod is inserted into the first hollow cavity, the first end is deformed by pressure to have the second diameter.

7. The secondary battery according to claim 1, characterized in that, The second end is electrically insulated from the cover plate by a second washer.

8. The secondary battery according to claim 1, characterized in that, The second end is exposed to the outside of the cover plate.

9. The secondary battery according to claim 8, characterized in that, The electrode rod includes an insertion region, which is disposed inside the first hollow section. The insertion region has a first diameter. The second end has a third diameter that is larger than the first diameter.

10. The secondary battery according to claim 1, characterized in that, The second end is provided at a predetermined interval from the reference plane.

11. The secondary battery according to claim 1, characterized in that, The first end is supported on the outer surface of the can. The second end is supported on the outer surface of the cover plate.

12. The secondary battery according to claim 11, characterized in that, The tank includes: A first surface, the first end portion being disposed on the first surface; and The second side extends from the first side. The second surface is formed as a curved surface with the curled edges omitted.

13. The secondary battery according to claim 1, characterized in that, At least a portion of the electrode rod is formed of a conductive material.

14. The secondary battery according to claim 1, characterized in that, The electrode rod includes an insertion region, which is disposed inside the first hollow section. The insertion area is provided with an insulating part, which is used to insulate the electrode rod and the electrode assembly.

15. The secondary battery according to claim 14, characterized in that, The insulating part includes at least one of an insulating coating and an insulating sleeve disposed on the outer surface of the insertion area.

16. The secondary battery according to claim 1, characterized in that, The electrode rod is configured to transfer heat generated from and transferred to the first hollow portion of the electrode assembly to the first end and the second end.

17. The secondary battery according to claim 1, characterized in that, The electrode rod is formed of a solid shaft. At least one of the first end and the second end is provided with a flange. The flange protrudes around the outer side of the first end or the second end and is radially deformed by pressure after the electrode rod is inserted into the first hollow.

18. The secondary battery according to claim 1, characterized in that, The electrode rod is formed by a hollow shaft with a second hollow section. The second hollow extends from the first end to the second end and penetrates the electrode rod.

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