Cylindrical battery and battery pack

Abstract

This application provides a cylindrical battery and battery pack, relating to the field of battery technology. When manufacturing the cylindrical battery, multiple first tabs arranged radially are connected by a first solder mark, and multiple first tabs arranged circumferentially are connected by a second solder mark, thereby forming a current collector structure. Then, the current collector structure is welded to the terminal block to achieve electrical connection between the electrode assembly and the terminal block. In this process, since the first tabs are thinner than the current collector plate, no high power input is required when welding the first tabs. Therefore, the flatness of the welded current collector structure is higher than that of the current collector plate. This helps to achieve a higher fit when the current collector structure is welded to the terminal block, reducing the possibility of poor soldering, thereby increasing the current-carrying area and improving the current-carrying performance of the cylindrical battery. Simultaneously, it eliminates the need for the current collector plate on the terminal block side while still achieving electrical connection, thus helping to reduce manufacturing costs and increase the energy density of the cylindrical battery.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a cylindrical battery and battery pack. Background Technology

[0002] The information disclosed in this background section is intended only to enhance the understanding of the general background of this disclosure and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art.

[0003] Cylindrical batteries are equipped with current collectors, which are welded to terminals and multiple tabs on the side of the terminals to achieve electrical connection between the electrode assembly and the terminals. However, welding the current collector to the tabs on the side of the terminals requires high power input, which can easily lead to uneven solder joints. This results in insufficient flatness of the current collector, which in turn makes some areas prone to poor soldering when welding the current collector to the terminals, thus adversely affecting the overcurrent performance of the cylindrical battery. Summary of the Invention

[0004] In view of this, the purpose of this application is to provide a cylindrical battery and battery pack, which aims to solve the technical problem of how to improve the overcurrent performance of a cylindrical battery.

[0005] To achieve the above objectives, the technical solution adopted in this application is as follows: In a first aspect, embodiments of this application provide a cylindrical battery having a radial direction, a circumferential direction, and an axial direction perpendicular to the radial direction. The cylindrical battery includes: a housing having a receiving cavity; an electrode post passing through the housing along the axial direction; and an electrode assembly disposed within the receiving cavity and including a main body and a first lead-out portion. The first lead-out portion is located on the side of the main body near the electrode post along the axial direction. The first lead-out portion includes a plurality of first tab groups arranged radially, each first tab group including a plurality of first tabs arranged circumferentially, and each first tab being electrically connected to the main body. The first lead-out portion has a first solder mark and a second solder mark on the side of the first lead-out portion near the electrode post along the axial direction. In the plurality of first tab groups, the first solder mark connects the plurality of first tabs arranged radially, and the second solder mark connects the plurality of first tabs arranged circumferentially. The first solder mark, the second solder mark, and the plurality of first tab groups together form a current-collecting structure, which is welded to the electrode post.

[0006] When manufacturing the cylindrical battery provided in this application, multiple first tabs arranged radially are connected by a first solder mark, and multiple first tabs arranged circumferentially are connected by a second solder mark to form a current collector structure. Then, the current collector structure is welded to the terminal block to achieve electrical connection between the electrode assembly and the terminal block. In this process, since the first tabs are thinner than the current collector plate, no high-power input is required when welding the first tabs. Therefore, the flatness of the welded current collector structure is higher than that of the current collector plate. This helps to achieve a higher fit when the current collector structure is welded to the terminal block, reducing the possibility of poor soldering, thereby increasing the current-carrying area and improving the current-carrying performance of the cylindrical battery. Simultaneously, the current collector plate on the side where the terminal block is located can be omitted while still achieving electrical connection, thus helping to reduce manufacturing costs and increase the energy density of the cylindrical battery.

[0007] In some embodiments of the first aspect, the first solder mark includes a plurality of linear solder marks extending along the radial direction, the plurality of linear solder marks being arranged at circumferential intervals; in a plurality of first tab groups, each of the linear solder marks connects to a plurality of first tabs arranged along the radial direction.

[0008] In some embodiments of the first aspect, the second solder mark includes a plurality of first annular solder marks intersecting the linear solder mark, the plurality of first annular solder marks being arranged at radial intervals; in a plurality of first tab groups, each first annular solder mark connects to a plurality of first tabs arranged circumferentially.

[0009] In some embodiments of the first aspect, the second solder mark includes a plurality of solder mark groups arranged at radial intervals, each solder mark group including a plurality of dot solder marks arranged at circumferential intervals; in the plurality of first tab groups, each dot solder mark connects two first tabs adjacent to each other in the circumferential direction.

[0010] In some embodiments of the first aspect, each of the dotted solder marks in a portion of the solder mark group is also connected to two first tabs that are adjacent to each other along the radial direction.

[0011] In some embodiments of the first aspect, the second solder mark includes a plurality of solder mark groups arranged radially spaced apart, each solder mark group including a plurality of second annular solder marks arranged circumferentially spaced apart; in the plurality of first tab groups, each second annular solder mark connects two first tabs adjacent to each other circumferentially.

[0012] In some embodiments of the first aspect, each of the second annular solder marks in a portion of the solder mark group is also connected to two first tabs that are adjacent to each other along the radial direction.

[0013] In some embodiments of the first aspect, the electrode post is provided in a plurality of positions, the plurality of electrode posts are arranged at intervals along the circumferential direction, and the current collection structure is welded to the plurality of electrode posts.

[0014] In some embodiments of the first aspect, the electrode assembly has a central through-hole communicating with the receiving cavity, the wall of the central through-hole being offset from the orthographic projection of the outer casing along the axial direction and the pole being offset from the orthographic projection of the outer casing along the axial direction.

[0015] In some embodiments of the first aspect, the electrode post is provided with a welding groove on the side away from the current collection structure along the axial direction, the welding groove is recessed along the axial direction toward the electrode assembly, the groove wall includes a bottom wall, and the bottom wall is welded to the current collection structure.

[0016] In some embodiments of the first aspect, the housing includes a shell and an end cap, the electrode post passing through the shell along the axial direction, the electrode post being insulated from the shell, the shell having the receiving cavity, the end cap being connected to the side of the shell along the axial direction away from the electrode post and sealing the receiving cavity, the electrode assembly further including a second lead electrically connected to the body portion, the polarity of the second lead portion being opposite to that of the first lead portion, the second lead portion being located on the side of the body portion along the axial direction near the end cap, and the end cap being electrically connected to the second lead portion.

[0017] In some embodiments of the first aspect, the cylindrical battery further includes a current collector located within the receiving cavity, the current collector being located on the side of the second lead-out portion close to the end cap along the axial direction, the second lead-out portion including a plurality of second tab groups arranged radially, each second tab group including a plurality of second tabs arranged circumferentially, each second tab being electrically connected to the main body portion, and the current collector being welded to the plurality of second tabs and the end cap.

[0018] Secondly, embodiments of this application provide a battery pack including the cylindrical battery described in any of the embodiments of the first aspect above.

[0019] The battery pack provided in this application has all the beneficial effects of cylindrical batteries because it includes cylindrical batteries in any of the above embodiments.

[0020] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 A three-dimensional schematic diagram of the cylindrical battery in an embodiment of this application is shown; Figure 2 It shows Figure 1 Schematic diagram of the disassembly section of a cylindrical battery Figure 1 ; Figure 3 It shows Figure 1 Schematic diagram of the disassembly section of a cylindrical battery Figure 2 ; Figure 4 It shows Figure 1 Schematic diagram of the section view at point AA; Figure 5 It shows Figure 4 A magnified schematic diagram of region B in the middle; Figure 6 A schematic diagram of the electrode assembly from one perspective is shown in some embodiments of this application; Figure 7 It shows Figure 6 A schematic diagram of the structure when the first and second solder marks are hidden; Figure 8 This application shows a schematic diagram of the electrode assembly from another perspective in some embodiments; Figure 9 A schematic diagram of the electrode assembly from one perspective is shown in some other embodiments of this application; Figure 10 A three-dimensional structural schematic diagram of the electrode assembly is shown in some embodiments of this application.

[0023] Explanation of key component symbols: 100 - Cylindrical battery; 110 - Casing; 111 - Receiving cavity; 112 - Housing; 113 - End cap; 1131 - Liquid filling through hole; 120 - Terminal post; 121 - Solder groove; 1211 - Bottom wall of groove; 130 - Electrode assembly; 131 - Main body; 132 - First lead-out part; 1321 - First solder mark; 13211 - Linear solder mark; 1322 - Second solder mark; 13221 - First annular solder mark; 13222 - Solder mark Group; 13223-dot solder mark; 13224-second annular solder mark; 1323-first electrode lug group; 13231-first electrode lug; 1324-current collector structure; 133-central through hole; 134-second lead-out part; 1341-second electrode lug group; 13411-second electrode lug; 150-current collector plate; 160-first insulating component; 170-second insulating component; 180-sealing component; X-radial; Y-circumferential; Z-axial. Detailed Implementation

[0024] The embodiments of this application are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0025] In the description of this application, the terms "center", "longitudinal", "lateral", "length", "width", "height", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0026] Furthermore, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first and second features are in direct contact, or that they are in indirect contact through an intermediate medium. Moreover, "above" or "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below" or "below" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0027] In the description of this application, the terms "first," "second," etc., are used to distinguish different objects and should not be construed as indicating or implying a specific order or hierarchy, or implicitly specifying the number of technical features indicated. Therefore, a feature marked "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, the term "multiple" means two or more, unless otherwise explicitly defined.

[0028] In the description of this application, unless otherwise explicitly specified, the term "connection" should be interpreted broadly. For example, it can refer to a non-detachable connection, a detachable connection, or a single-piece structure; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0029] In the description of this application, the term "and / or" can be understood to mean three possibilities. For example, A and / or B can represent: A alone; A and B simultaneously; or B alone. Additionally, the character " / " generally indicates that the preceding and following objects have an "or" relationship.

[0030] In the description of this application, "parallel" includes not only the case of absolute parallelism, but also the case of approximate parallelism as commonly understood in engineering; similarly, "perpendicular" also includes not only the case of absolute perpendicularity, but also the case of approximate perpendicularity as commonly understood in engineering. For example, if the angle between two directions is 80° to 90°, the two directions can be considered perpendicular; if the angle between two directions is 0° to 10°, the two directions can be considered parallel.

[0031] Cylindrical batteries are a crucial component of battery packs, featuring a current collector. The current collector is welded to the terminals and multiple tabs on the terminal side to establish electrical connections between the electrode assembly and the terminals. However, welding the current collector to the tabs on the terminal side requires high power input, which can easily lead to uneven solder joints (i.e., solder joint protrusion). This results in insufficient flatness of the current collector, making some areas prone to poor soldering when welding the current collector to the terminals, thus adversely affecting the overcurrent performance of the cylindrical battery. Furthermore, the aforementioned cylindrical batteries also present technical challenges in reducing manufacturing costs and increasing energy density.

[0032] like Figure 1As shown, to solve the above-mentioned technical problems, embodiments of this application provide a cylindrical battery 100, which relates to the field of battery technology and is mainly used in battery packs, so as to be indirectly applied to electrical devices and energy storage devices in the form of battery packs. Of course, the cylindrical battery 100 can also be directly applied to electrical devices and energy storage devices without adopting the form of a battery pack, and no specific limitation is made to the application scenarios of the cylindrical battery 100 here.

[0033] For example, electrical devices can be vehicles, mobile phones, computers, ships, spacecraft, electric toys, and power tools. Vehicles can be gasoline-powered cars, natural gas-powered cars, and new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, and range-extended electric vehicles. Spacecraft can be airplanes, rockets, drones, and spacecraft. Electric toys can be game consoles, electric car toys, electric ship toys, and electric airplane toys. Power tools can be metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, specifically such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers. Energy storage devices can be energy storage containers, energy storage cabinets, energy storage power stations, wind power generation devices, solar power generation devices, mobile power devices, and temporary power supply devices. No specific limitations are made on the types of electrical devices and energy storage devices here.

[0034] It should be noted that the cylindrical battery 100 mainly relies on the movement of metal ions between the positive and negative electrodes to function. Classified by the type of metal ions, the cylindrical battery 100 can be a lithium-ion battery, sodium-ion battery, etc.; classified by the physical state of the electrolyte, the cylindrical battery 100 can be a liquid battery, i.e., using a liquid electrolyte (electrolyte); of course, the cylindrical battery 100 can also be a solid-state battery or a semi-solid-state battery, i.e., the electrolyte is at least partially solid-state, with common materials such as sulfide, oxide, or polymer electrolytes. Solid-state electrolytes can replace the separator and liquid electrolyte, combining ion conduction and isolation functions. Therefore, no specific limitation is made on the type of cylindrical battery 100 here.

[0035] like Figure 1 as well as Figures 3 to 7As shown, the cylindrical battery 100 provided in this embodiment has a radial direction X, a circumferential direction Y, and an axial direction Z perpendicular to the radial direction X. The cylindrical battery 100 includes a housing 110, a terminal post 120, and an electrode assembly 130. The housing 110 is provided with a receiving cavity 111. The terminal post 120 passes through the housing 110 along the axial direction Z. The electrode assembly 130 is disposed in the receiving cavity 111 and includes a main body 131 and a first lead-out portion 132. The first lead-out portion 132 is located on the side of the main body 131 close to the terminal post 120 along the axial direction Z. The first lead-out portion 132 includes a plurality of first tab groups 1323 arranged along the radial direction X. Each first tab group 1323 includes a plurality of first tabs 13231 arranged along the circumferential direction Y. Each first tab 13231 is electrically connected to the main body 131.

[0036] The first lead-out portion 132 is provided with a first solder mark 1321 and a second solder mark 1322 on the side of the pole post 120 along the axial direction Z. Among the multiple first electrode tab groups 1323, the first solder mark 1321 connects the multiple first electrode tabs 13231 arranged along the radial direction X, and the second solder mark 1322 connects the multiple first electrode tabs 13231 arranged along the circumferential direction Y. The first solder mark 1321, the second solder mark 1322 and the multiple first electrode tab groups 1323 together form a current collection structure 1324, which is welded to the pole post 120.

[0037] It is understood that when manufacturing the cylindrical battery 100 provided in this embodiment, a plurality of first tabs 13231 arranged in the radial direction X are connected by a first solder mark 1321, and a plurality of first tabs 13231 arranged in the circumferential direction Y are connected by a second solder mark 1322, thereby forming a current collector structure 1324; then the current collector structure 1324 is welded to the terminal post 120 to realize the electrical connection between the electrode assembly 130 and the terminal post 120.

[0038] In this process, because the first tab 13231 is thinner than the current collector, no high power input is required when welding the first tab 13231. Therefore, the flatness of the current collector structure 1324 formed by welding is higher than that of the current collector. This helps to achieve a higher fit when welding the current collector structure 1324 to the terminal post 120, reducing the possibility of poor soldering. This helps to increase the current-carrying area and improve the current-carrying performance of the cylindrical battery 100. At the same time, the current collector on the side where the terminal post 120 is located can be eliminated while still achieving electrical connection, thereby helping to reduce manufacturing costs and increase the energy density of the cylindrical battery 100.

[0039] like Figure 1 , Figure 6 and Figure 7As shown, in some embodiments, the first solder mark 1321 includes a plurality of linear solder marks 13211 extending radially X, and the plurality of linear solder marks 13211 are arranged at intervals along the circumferential Y direction; in a plurality of first tab groups 1323, each linear solder mark 13211 connects to a plurality of first tabs 13231 arranged radially X.

[0040] In this way, the multiple first tabs 13231 arranged radially X in the multiple first tab groups 1323 are electrically connected by linear solder marks 13211.

[0041] For example, the linear solder mark 13211 can be a straight solder mark extending in the radial direction X, or a non-straight solder mark extending in the radial direction X (e.g., wavy linear solder mark, zigzag solder mark, etc.), without specific limitations.

[0042] like Figure 1 and Figure 6 As shown, the second solder mark 1322 further includes a plurality of first annular solder marks 13221 intersecting with the linear solder mark 13211, and the plurality of first annular solder marks 13221 are arranged at intervals along the radial direction X; in the plurality of first tab groups 1323, each first annular solder mark 13221 connects to a plurality of first tabs 13231 arranged along the circumferential direction Y.

[0043] In this way, the multiple first tabs 13231 arranged in the circumferential Y direction in the multiple first tab groups 1323 are electrically connected by the first annular solder mark 13221.

[0044] like Figure 1 , Figure 7 and Figure 9 As shown, in some embodiments, the second solder mark 1322 includes a plurality of solder mark groups 13222 arranged at intervals along the radial direction X, and each solder mark group 13222 includes a plurality of dot solder marks 13223 arranged at intervals along the circumferential direction Y; in the plurality of first tab groups 1323, each dot solder mark 13223 connects two adjacent first tabs 13231 along the circumferential direction Y.

[0045] In this way, multiple first tabs 13231 arranged in the circumferential Y direction in multiple first tab groups 1323 are electrically connected by dotted solder marks 13223.

[0046] like Figure 9 As shown, further, each dotted solder mark 13223 in a portion of the solder mark group 13222 is also connected to two adjacent first tabs 13231 along the radial X direction.

[0047] In this way, the multiple first tabs 13231 arranged along the circumferential Y direction in the multiple first tab groups 1323 are electrically connected by the dotted solder marks 13223, and the multiple first tabs 13231 arranged along the radial X direction in the multiple first tab groups 1323 are also electrically connected, which helps to simplify the welding process and further reduce the manufacturing cost of the cylindrical battery 100.

[0048] like Figure 1 , Figure 7 and Figure 10 As shown, in some other embodiments, the second solder mark 1322 includes a plurality of solder mark groups 13222 arranged at intervals along the radial direction X, each solder mark group 13222 including a plurality of second annular solder marks 13224 arranged at intervals along the circumferential direction Y; in the plurality of first tab groups 1323, each second annular solder mark 13224 connects two adjacent first tabs 13231 along the circumferential direction Y.

[0049] In this way, the multiple first tabs 13231 arranged in the circumferential Y direction in the multiple first tab groups 1323 are electrically connected by the second annular solder mark 13224.

[0050] For example, the first annular solder mark 13221 / the second annular solder mark 13224 can be a closed annular solder mark or a non-closed annular solder mark, without any specific limitation here.

[0051] For example, the linear solder mark 13211 / dot solder mark 13223 / first annular solder mark 13221 / second annular solder mark 13224 can be laser solder marks or ultrasonic solder marks, without specific limitations here.

[0052] like Figure 10 As shown, further, each of the second annular solder marks 13224 in a portion of the solder mark group 13222 is also connected to two adjacent first tabs 13231 along the radial X direction.

[0053] In this way, the second annular solder mark 13224 can electrically connect the multiple first tabs 13231 arranged in the circumferential Y direction in the multiple first tab groups 1323, and also connect the multiple first tabs 13231 arranged in the radial X direction in the multiple first tab groups 1323, thereby helping to simplify the welding process and further reduce the manufacturing cost of the cylindrical battery 100.

[0054] like Figures 1 to 5 As shown, in some embodiments, multiple pole posts 120 are provided, and the multiple pole posts 120 are arranged at intervals along the circumferential Y direction. The current collection structure 1324 is welded to the multiple pole posts 120.

[0055] Understandably, welding multiple terminals 120 to the current collector structure 1324 helps to increase the current-carrying area, thereby improving the current-carrying performance of the cylindrical battery 100.

[0056] like Figure 1 , Figure 4 and Figure 5 As shown, in some embodiments, the electrode assembly 130 has a central through hole 133 communicating with the receiving cavity 111, and the orthographic projection of the wall of the central through hole 133 along the axial direction Z onto the housing 110 and the orthographic projection of the electrode post 120 along the axial direction Z onto the housing 110 are offset.

[0057] In this way, the walls of the electrode post 120 and the central through hole 133 are staggered along the radial X direction, so as to reduce the adverse effect of the central through hole 133 on the welding area of ​​the electrode post 120 and the current collector structure 1324, which helps to further improve the overcurrent performance of the cylindrical battery 100.

[0058] like Figure 1 and Figure 5 As shown, in some embodiments, the electrode post 120 is provided with a welding groove 121 on the side away from the current collection structure 1324 along the axial direction Z. The welding groove 121 is recessed along the axial direction Z towards the electrode assembly 130. The groove wall of the welding groove 121 includes a bottom wall 1211, which is welded to the current collection structure 1324.

[0059] Understandably, by setting the weld groove 121, the difficulty of welding the pole post 120 and the current collector structure 1324 can be reduced, and the input power of welding can also be reduced, thereby reducing the possibility of cold solder joints.

[0060] like Figures 1 to 4 As shown, in some embodiments, the housing 110 includes a housing 112 and an end cap 113. The electrode post 120 passes through the housing 112 along the axial direction Z. The electrode post 120 is insulated from the housing 112. The housing 112 has a receiving cavity 111. The end cap 113 is connected to the side of the housing 112 away from the electrode post 120 along the axial direction Z and covers the receiving cavity 111. The electrode assembly 130 also includes a second lead 134 electrically connected to the main body 131. The polarity of the second lead 134 is opposite to that of the first lead 132. The second lead 134 is located on the side of the main body 131 close to the end cap 113 along the axial direction Z. The end cap 113 is electrically connected to the second lead 134.

[0061] In this way, one of the pole post 120 and the end cap 113 serves as the positive terminal of the external circuit, and the other of the pole post 120 and the end cap 113 serves as the negative terminal of the external circuit.

[0062] like Figure 1 , Figure 4 and Figure 8As shown, the cylindrical battery 100 further includes a current collector 150 located in the receiving cavity 111. The current collector 150 is located on the side of the second lead-out portion 134 close to the end cover 113 along the axial direction Z. The second lead-out portion 134 includes a plurality of second tab groups 1341 arranged along the radial direction X. Each second tab group 1341 includes a plurality of second tabs 13411 arranged along the circumferential direction Y. Each second tab 13411 is electrically connected to the main body portion 131. The current collector 150 is welded to the plurality of second tabs 13411 and the end cover 113.

[0063] In this way, multiple second electrodes 13411 are electrically connected to the end cap 113 through the collector plate 150, so that the electrode assembly 130 is electrically connected to the end cap 113.

[0064] For example, the material of the collector 150 can be a metallic conductive material (e.g., copper, aluminum, silver, gold, iron, nickel, etc.) or a non-metallic conductive material (e.g., carbon-based material, superconductor, semiconductor, etc.), without any specific limitation.

[0065] It should be noted that one of the first tab 13231 and the second tab 13411 is a positive tab, and the other of the first tab 13231 and the second tab 13411 is a negative tab. The electrode assembly 130 may include a positive electrode sheet, a negative electrode sheet and an insulating layer and is manufactured by a winding process or a stacking process. The insulating layer is disposed between the positive electrode sheet and the negative electrode sheet. The positive electrode sheet includes a positive current collector and a positive active material layer, and the positive active material layer is coated on the positive current collector. The negative electrode sheet includes a negative current collector and a negative active material layer, and the negative active material layer is coated on the negative current collector.

[0066] The main body 131 includes a positive electrode active material layer, a portion of the positive electrode current collector coated with the positive electrode active material layer, a negative electrode active material layer, and a portion of the negative electrode current collector coated with the negative electrode active material layer. The portion of the positive electrode current collector not coated with the positive electrode active material layer is the positive electrode tab, and the portion of the negative electrode current collector not coated with the negative electrode active material layer is the negative electrode tab.

[0067] For example, the material of the separator layer can be polypropylene, polyethylene, etc.; taking lithium ions as an example, the material of the positive electrode current collector can be aluminum, and the material of the positive electrode active material layer can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, lithium manganese oxide, etc.; the material of the negative electrode current collector can be copper, and the negative electrode active material can be graphite, silicon, etc., without making specific limitations on the above materials.

[0068] like Figures 1 to 3 As shown, the end cap 113 is further provided with a liquid injection through hole 1131 communicating with the receiving cavity 111. The cylindrical battery 100 also includes a sealing member 180, which is welded to the end cap 113 and seals the liquid injection through hole 1131.

[0069] It is understandable that the electrolyte is easily injected into the receiving cavity 111 through the injection hole 1131, and the sealing member 180 is used to seal the cylindrical battery 100 after the injection is completed.

[0070] For example, the materials of the end cap 113, the housing 112, and the sealing element 180 can be aluminum, aluminum alloy, copper, iron, stainless steel, plastic, etc., without specific limitations.

[0071] like Figure 1 , Figure 4 and Figure 5 As shown, the cylindrical battery 100 further includes a first insulating member 160 and a second insulating member 170. The first insulating member 160 is located at the end of the terminal post 120 away from the end cap 113 along the axial direction Z. The first insulating member 160 is disposed between the housing 112 and the terminal post 120. The second insulating member 170 is located at the end of the terminal post 120 close to the end cap 113 along the axial direction Z. The second insulating member 170 is disposed between the housing 112 and the terminal post 120.

[0072] In this way, the pole post 120 is insulated from the housing 112 by the first insulating element 160 and the second insulating element 170, thereby reducing the risk of short circuit.

[0073] For example, the materials of the first insulating element 160 and the second insulating element 170 can be selected from the following categories: 1. Synthetic organic insulating materials: plastics (e.g., polyethylene, polyvinyl chloride, polypropylene, polytetrafluoroethylene, epoxy resin, etc.), synthetic rubber (e.g., silicone rubber, nitrile rubber, etc.), synthetic fibers (e.g., polyester fiber, nylon, etc.); 2. Natural organic insulating materials: wood, natural rubber, etc.; 3. Inorganic insulating materials: ceramics, glass, mica, quartz, asbestos, etc.; 4. Polymer insulating materials: polycarbonate, polyimide, etc., without specific limitations.

[0074] To address the aforementioned technical problems, embodiments of this application also provide a battery pack, including the cylindrical battery 100 from any of the above embodiments.

[0075] It is understood that since the battery pack provided in this embodiment includes the cylindrical battery 100 in any of the above embodiments, it has all the beneficial effects of the cylindrical battery 100, which will not be described in detail here.

[0076] In the description of this application, the terms "some embodiments," "one embodiment," "example," "specific example," "some examples," etc., refer to specific features, parts, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In the description of this application, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, parts, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. Furthermore, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0077] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A cylindrical battery having a radial (X), a circumferential (Y) direction, and an axial (Z) direction perpendicular to the radial (X) direction, characterized in that, include: The outer shell (110) is provided with a receiving cavity (111); The pole post (120) is inserted into the housing (110) along the axial direction (Z); An electrode assembly (130) is disposed within the receiving cavity (111) and includes a main body (131) and a first lead-out portion (132). The first lead-out portion (132) is located on the side of the main body (131) along the axial direction (Z) close to the pole post (120). The first lead-out portion (132) includes a plurality of first tab groups (1323) arranged along the radial direction (X). Each first tab group (1323) includes a plurality of first tabs (13231) arranged along the circumferential direction (Y). Each first tab (13231) is electrically connected to the main body (131). The first lead-out portion (132) is provided with a first solder mark (1321) and a second solder mark (1322) on the side of the pole post (120) along the axial direction (Z). In a plurality of first electrode tab groups (1323), the first solder mark (1321) connects a plurality of first electrode tabs (13231) arranged along the radial direction (X), and the second solder mark (1322) connects a plurality of first electrode tabs (13231) arranged along the circumferential direction (Y). The first solder mark (1321), the second solder mark (1322) and the plurality of first electrode tab groups (1323) together form a current collection structure (1324), which is welded to the pole post (120).

2. The cylindrical battery according to claim 1, characterized in that, The first solder mark (1321) includes a plurality of linear solder marks (13211) extending along the radial direction (X), and the plurality of linear solder marks (13211) are spaced apart along the circumferential direction (Y); in a plurality of first tab groups (1323), each of the linear solder marks (13211) connects to a plurality of first tabs (13231) arranged along the radial direction (X).

3. The cylindrical battery according to claim 2, characterized in that, The second solder mark (1322) includes a plurality of first annular solder marks (13221) intersecting with the linear solder mark (13211), the plurality of first annular solder marks (13221) being spaced apart along the radial (X) direction; in a plurality of first tab groups (1323), each first annular solder mark (13221) is connected to a plurality of first tabs (13231) arranged along the circumferential (Y) direction.

4. The cylindrical battery according to claim 1, characterized in that, The second solder mark (1322) includes a plurality of solder mark groups (13222) spaced apart along the radial (X) direction, each solder mark group (13222) including a plurality of dot solder marks (13223) spaced apart along the circumferential (Y) direction; in the plurality of first tab groups (1323), each dot solder mark (13223) connects two adjacent first tabs (13231) along the circumferential (Y) direction.

5. The cylindrical battery according to claim 4, characterized in that, Each of the dotted solder marks (13223) in a portion of the solder mark group (13222) is also connected to two adjacent first tabs (13231) along the radial (X) direction.

6. The cylindrical battery according to claim 1, characterized in that, The second solder mark (1322) includes a plurality of solder mark groups (13222) spaced apart along the radial (X) direction, each of the solder mark groups (13222) including a plurality of second annular solder marks (13224) spaced apart along the circumferential (Y) direction; in the plurality of first tab groups (1323), each second annular solder mark (13224) connects two adjacent first tabs (13231) along the circumferential (Y) direction.

7. The cylindrical battery according to claim 6, characterized in that, Each of the second annular solder marks (13224) in a portion of the solder mark group (13222) is also connected to two first tabs (13231) adjacent to each other along the radial (X).

8. The cylindrical battery according to any one of claims 1 to 7, characterized in that, The pole post (120) is provided in multiple ways, and the multiple pole posts (120) are arranged at intervals along the circumferential direction (Y). The current collection structure (1324) is welded to the multiple pole posts (120).

9. The cylindrical battery according to any one of claims 1 to 7, characterized in that, The electrode assembly (130) has a central through hole (133) communicating with the receiving cavity (111), the hole wall of the central through hole (133) in the orthographic projection of the housing (110) along the axis (Z) and the pole post (120) in the orthographic projection of the housing (110) along the axis (Z) are offset.

10. The cylindrical battery according to any one of claims 1 to 7, characterized in that, The electrode post (120) is provided with a welding groove (121) on the side away from the current collection structure (1324) along the axial direction (Z). The welding groove (121) is recessed along the axial direction (Z) towards the electrode assembly (130). The groove wall of the welding groove (121) includes a bottom wall (1211), which is welded to the current collection structure (1324).

11. The cylindrical battery according to any one of claims 1 to 7, characterized in that, The outer casing (110) includes a housing (112) and an end cap (113). The electrode post (120) passes through the housing (112) along the axial direction (Z). The electrode post (120) is insulated from the housing (112). The housing (112) has the receiving cavity (111). The end cap (113) is connected to the side of the housing (112) away from the electrode post (120) along the axial direction (Z) and covers the receiving cavity (111). The electrode assembly (130) also includes a second lead-out portion (134) electrically connected to the main body portion (131). The polarity of the second lead-out portion (134) is opposite to that of the first lead-out portion (132). The second lead-out portion (134) is located on the side of the main body portion (131) along the axial direction (Z) close to the end cap (113). The end cap (113) is electrically connected to the second lead-out portion (134).

12. The cylindrical battery according to claim 11, characterized in that, The cylindrical battery also includes a current collector (150) located in the receiving cavity (111). The current collector (150) is located on the side of the second lead-out portion (134) along the axial direction (Z) close to the end cap (113). The second lead-out portion (134) includes a plurality of second tab groups (1341) arranged along the radial direction (X). Each second tab group (1341) includes a plurality of second tabs (13411) arranged along the circumferential direction (Y). Each second tab (13411) is electrically connected to the main body portion (131). The current collector (150) is welded to the plurality of second tabs (13411) and the end cap (113).

13. A battery pack, characterized in that, The cylindrical battery includes any one of claims 1 to 12.

Images