Cylindrical battery and battery pack

Abstract

The application provides a cylindrical battery and a battery pack, and relates to the technical field of batteries. In the cylindrical battery, the electrode assembly and the first current collecting disc are arranged in the shell, the first current collecting disc is electrically connected to one end of the electrode assembly along a first direction, the first heat conducting piece is arranged in the center through hole of the electrode assembly and extends along the first direction, and the first heat conducting piece is connected to the first current collecting disc. In this way, the first heat conducting piece helps to conduct heat at the center through hole to the first current collecting disc, thereby reducing the risk of excessively high local temperature at the center through hole, and further helping to improve the electrical performance 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] In the field of battery technology, for electrode components manufactured using a winding process, increasing the diameter of the electrode components helps to improve the energy density of cylindrical batteries. However, as the diameter of the electrode components increases, when the cylindrical battery is charged and discharged rapidly, the central through-hole of the electrode components is prone to excessively high local temperature due to heat dissipation difficulties, which is detrimental to the electrical 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 that the central through hole of the electrode assembly is prone to local overheating due to heat dissipation difficulties.

[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 first direction. The cylindrical battery includes: a housing; an electrode assembly disposed within the housing, the electrode assembly having a central through hole extending along the first direction; a first current collector disposed within the housing, the first current collector being electrically connected to one end of the electrode assembly along the first direction; and a first heat-conducting element passing through the central through hole, the first heat-conducting element extending along the first direction, one end of the first heat-conducting element along the first direction being connected to the first current collector.

[0006] In some embodiments of the first aspect, the first heat-conducting element is a first heat-conducting wire, which is spirally arranged.

[0007] In some embodiments of the first aspect, the cylindrical battery further has a second direction perpendicular to the first direction, the diameter of the central through hole along the second direction is D, and the outer diameter of the first heat-conducting wire along the second direction is d1, satisfying: d1 < D.

[0008] In some embodiments of the first aspect, the electrode assembly includes a first diaphragm, a first electrode, a second diaphragm, and a second electrode, wherein the polarity of the first electrode and the polarity of the second electrode are opposite, the first diaphragm, the first electrode, the second diaphragm, and the second electrode are sequentially stacked and wound, the first electrode is electrically connected to the first current collector along one side of the first direction, and the first diaphragm forms the central through hole.

[0009] In some embodiments of the first aspect, the first thermally conductive element is made of an insulating material, and the cylindrical battery further includes a second current collector electrically connected to one end of the electrode assembly away from the first current collector along the first direction, the polarity of the first current collector being opposite to that of the second current collector, and the end of the first thermally conductive element away from the first current collector along the first direction being connected to the second current collector.

[0010] In some embodiments of the first aspect, the cylindrical battery further includes a second current collector and a second heat-conducting element. The second current collector is disposed within the housing. The first heat-conducting element is made of a first metal material, and the second heat-conducting element is made of a second metal material. The second current collector is electrically connected to one end of the electrode assembly away from the first current collector along the first direction. The polarity of the first current collector is opposite to that of the second current collector. The second heat-conducting element passes through the central through hole and extends along the first direction. One end of the second heat-conducting element along the first direction is connected to the second current collector. The first heat-conducting element and the second heat-conducting element are insulated from each other.

[0011] In some embodiments of the first aspect, the second heat-conducting element is a second heat-conducting wire, which is spirally arranged.

[0012] In some embodiments of the first aspect, the cylindrical battery further has a second direction perpendicular to the first direction, the diameter of the central through hole along the second direction is D, and the outer diameter of the second heat-conducting wire along the second direction is d2, satisfying: d2 < D.

[0013] In some embodiments of the first aspect, the cylindrical battery further includes an insulating component passing through the central through hole, the insulating component being disposed between the first thermal conductive element and the second thermal conductive element along the first direction, and the insulating component being connected to the first thermal conductive element and the second thermal conductive element.

[0014] In some embodiments of the first aspect, the insulating assembly includes a first insulating member and a second insulating member, the first insulating member being fixedly connected to one end of the first heat-conducting member away from the first manifold along the first direction, and the second insulating member being fixedly connected to one end of the second heat-conducting member away from the second manifold along the first direction.

[0015] In some embodiments of the first aspect, the insulating assembly further includes an adhesive element that is bonded to both the first insulating element and the second insulating element.

[0016] In some embodiments of the first aspect, the adhesive includes a first adhesive layer and a second adhesive layer bonded to each other, the first adhesive layer being bonded to the first insulating member and the second adhesive layer being bonded to the second insulating member.

[0017] In some embodiments of the first aspect, the cylindrical battery further includes an electrode post, the housing includes a casing and an end cap, the end cap being connected to one end of the casing along the first direction; wherein the electrode post passes through the end of the casing along the first direction away from the end cap and is insulated from the casing, and the second current collector is electrically connected to the end cap; or, the electrode post passes through the end cap and is insulated from the end cap, and the second current collector is electrically connected to the casing.

[0018] In some embodiments of the first aspect, the cylindrical battery further includes a first terminal and a second terminal, the first terminal being disposed at one end of the housing along the first direction, and the second terminal being disposed at one end of the housing away from the first terminal along the first direction, both the first terminal and the second terminal being insulated from the housing, the first terminal being electrically connected to the first current collector, and the second terminal being electrically connected to the second current collector.

[0019] Secondly, embodiments of this application provide a battery pack including the cylindrical battery described in any of the embodiments of the first aspect above.

[0020] The beneficial effects of this application are as follows: In the cylindrical battery provided in this application, a first current collector is electrically connected to one end of the electrode assembly along a first direction. A first heat-conducting element passes through the central through-hole of the electrode assembly and extends along the first direction, and is connected to the first current collector. In this way, the first heat-conducting element helps to conduct heat from the central through-hole to the first current collector, utilizing the surface of the first current collector for more efficient heat dissipation. This reduces the risk of localized overheating at the central through-hole, thereby contributing to improved electrical performance of the cylindrical battery.

[0021] 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

[0022] 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.

[0023] Figure 1 A three-dimensional structural schematic diagram of a cylindrical battery in some embodiments of this application is shown; Figure 2 It shows Figure 1 A three-dimensional structural diagram of the middle electrode assembly; Figure 3 It shows Figure 2 A schematic diagram of the middle electrode assembly when deployed from one perspective; Figure 4 It shows Figure 1 3D structural diagram when the outer shell and pole are concealed Figure 1 ; Figure 5 It shows Figure 4 A three-dimensional structural diagram showing the second collector, the second heat-conducting component, and the second insulating component concealed. Figure 6 It shows Figure 4 A three-dimensional structural diagram showing the first collector plate, the first heat-conducting component, and the first insulating component concealed. Figure 7 It shows Figure 1 3D structural diagram when the outer shell and pole are concealed Figure 2 ; Figure 8 A schematic diagram of the cylindrical battery structure from one perspective is shown in some other embodiments of this application; Figure 9 A schematic diagram of the cylindrical battery structure from one perspective is shown in some embodiments of this application.

[0024] Explanation of key component symbols: 100-Cylindrical battery; 110-Electrode assembly; 111-Central through hole; 112-First separator; 113-First electrode; 114-Second separator; 115-Second electrode; 120-First current collector; 130-Second current collector; 140-First heat conductor; 141-First heat conductor wire; 150-Second heat conductor; 151-Second heat conductor wire; 160-Insulating assembly; 161-First insulating component; 162-Second insulating component; 163-Adhesive component; 1631-First adhesive layer; 1632-Second adhesive layer; 171-Outer shell; 1711-Shell; 1712-End cap; 172-Terminal post; 173-First terminal post; 174-Second terminal post; Z-First direction; X-Second direction. Detailed Implementation

[0025] 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.

[0026] 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.

[0027] 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.

[0028] 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 specified. Additionally, the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0029] 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.

[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] In the description of this application, the term "fixed connection" refers to two objects that are connected to each other and whose relative positions remain unchanged under normal use conditions, i.e., they will not easily undergo relative movement (e.g., relative rotation and relative movement); the term "rotational connection" refers to two objects that are connected to each other and can rotate relative to each other; and the term "sliding connection" refers to two objects that are connected to each other and can slide relative to each other.

[0032] Cylindrical batteries are an important component of battery packs. For the electrode components manufactured using a winding process, increasing the diameter of the electrode components helps to improve the energy density of the cylindrical battery.

[0033] However, as the diameter of the electrode assembly increases, when the cylindrical battery is charged and discharged rapidly, especially at the central through-hole of the electrode assembly, the local temperature is prone to become too high due to heat dissipation difficulties, which is detrimental to the electrical performance of the cylindrical battery.

[0034] 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.

[0035] 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.

[0036] It should be noted that the cylindrical battery 100 mainly relies on the movement of metal ions between the positive and negative electrodes to work. According to the type of metal ions, the cylindrical battery 100 can be a lithium-ion battery, sodium-ion battery, etc. According to the physical state of the electrolyte, the cylindrical battery 100 can be a liquid battery, that is, it uses a liquid electrolyte (electrolyte). Of course, the cylindrical battery 100 can also be a solid-state battery or a semi-solid-state battery, that is, the electrolyte is at least partially solid-state. Common materials include sulfide, oxide, or polymer electrolytes. Solid-state electrolytes can replace the separator and liquid electrolyte, and have both ion conduction and isolation functions. The specific type of cylindrical battery 100 is not limited here.

[0037] like Figure 1 , Figure 2 and Figure 4 As shown, the cylindrical battery 100 provided in this embodiment has a first direction Z (the first direction Z is the axial direction of the cylindrical battery 100). The cylindrical battery 100 includes: a shell 171, an electrode assembly 110, a first current collector 120 and a first heat-conducting element 140.

[0038] The electrode assembly 110 is disposed inside the housing 171 and has a central through hole 111 extending along the first direction Z; the first collector 120 is disposed inside the housing 171 and is electrically connected to one end of the electrode assembly 110 along the first direction Z; the first heat-conducting element 140 passes through the central through hole 111 and extends along the first direction Z, with one end of the first heat-conducting element 140 connected to the first collector 120 along the first direction Z.

[0039] It is understood that in the cylindrical battery 100 provided in this embodiment, the first current collector 120 is electrically connected to one end of the electrode assembly 110 along the first direction Z, and the first heat-conducting element 140 passes through the central through hole 111 of the electrode assembly 110 and extends along the first direction Z. The first heat-conducting element 140 is connected to the first current collector 120. In this way, the first heat-conducting element 140 helps to conduct heat from the central through hole 111 to the first current collector 120, thereby reducing the risk of local overheating at the central through hole 111 and thus helping to improve the electrical performance of the cylindrical battery 100.

[0040] like Figure 4 and Figure 5 As shown, in some embodiments, the first heat-conducting element 140 is a first heat-conducting wire 141, which is spirally arranged. In this way, while maintaining a large thermally conductive contact area between the first heat-conducting element 140 and the electrode assembly 110, the weight of the first heat-conducting element 140 can be achieved, thereby helping to improve the energy density of the cylindrical battery 100.

[0041] It should be noted that "the first heat-conducting wire 141 is spirally arranged" can be understood as: the electrode assembly 110 has a center line, and the first heat-conducting wire 141 is spirally distributed around the center line.

[0042] like Figure 2 and Figure 5 As shown, the cylindrical battery 100 further includes a second direction X perpendicular to the first direction Z (the second direction X is the diameter direction of the cylindrical battery 100). The diameter of the central through hole 111 along the second direction X is D, and the outer diameter of the first heat-conducting wire 141 along the second direction X is d1, satisfying that d1 < D. This makes it easy for the first heat-conducting wire 141 to pass through the central through hole 111, thereby reducing the assembly difficulty of the first heat-conducting wire 141.

[0043] It should be noted that the outer diameter of the first heat-conducting wire 141 along the second direction X refers to the maximum diameter of the first heat-conducting wire 141 in the spiral state, that is, the distance from the outermost edge of one side to the outermost edge of the other side.

[0044] For example, the outer diameter of the first heat-conducting wire 141 along the second direction X can be measured by measuring tools such as vernier calipers, micrometers, and video measuring instruments.

[0045] like Figures 2 to 4 As shown, the electrode assembly 110 further includes a first diaphragm 112, a first electrode 113, a second diaphragm 114, and a second electrode 115. The polarity of the first electrode 113 is opposite to that of the second electrode 115. The first diaphragm 112, the first electrode 113, the second diaphragm 114, and the second electrode 115 are sequentially stacked and wound together. The first electrode 113 is electrically connected to the first current collector 120 on one side along the first direction Z. The first diaphragm 112 forms a central through hole 111.

[0046] It is understandable that by forming a central through hole 111 through which the first heat-conducting element 140 passes by the first diaphragm 112, the first electrode 113 and the first heat-conducting element 140 can be isolated, thereby reducing the risk of damage to the first electrode 113 caused by the first heat-conducting element 140.

[0047] For example, the material of the first diaphragm 112 / the material of the second diaphragm 114 can be polypropylene, polyethylene, etc., and no specific limitation is made here.

[0048] like Figure 1 and Figure 7 As shown, in some embodiments, the first heat-conducting element 140 is made of insulating material, and the cylindrical battery 100 also includes a second current collector 130. The second current collector 130 is electrically connected to the end of the electrode assembly 110 away from the first current collector 120 along the first direction Z. The polarity of the first current collector 120 is opposite to that of the second current collector 130. The end of the first heat-conducting element 140 away from the first current collector 120 along the first direction Z is connected to the second current collector 130.

[0049] Understandably, the first heat-conducting element 140 helps to conduct heat from the central through hole 111 to the first collector 120 and the second collector 130 simultaneously, thereby further reducing the risk of local overheating at the central through hole 111 and thus helping to further improve the electrical performance of the cylindrical battery 100.

[0050] Meanwhile, since both the first collector plate 120 and the second collector plate 130 are connected to the first heat-conducting element 140, the first heat-conducting element 140 penetrates the central through hole 111 along the first direction Z, thereby increasing the heat-conducting contact area between the first heat-conducting element 140 and the electrode assembly 110.

[0051] For example, the insulating materials mentioned above can be silicone, epoxy resin, polyurethane, nylon, etc., and no specific limitation is made here.

[0052] like Figure 1and Figure 4 As shown, in some other embodiments, the cylindrical battery 100 further includes a second current collector 130 and a second heat conductor 150. The second current collector 130 is disposed inside the housing 171. The first heat conductor 140 is made of a first metal material, and the second heat conductor 150 is made of a second metal material. The second current collector 130 is electrically connected to one end of the electrode assembly 110 away from the first current collector 120 along the first direction Z. The polarity of the first current collector 120 is opposite to that of the second current collector 130. The second heat conductor 150 passes through the central through hole 111 and extends along the first direction Z. One end of the second heat conductor 150 along the first direction Z is connected to the second current collector 130. The first heat conductor 140 and the second heat conductor 150 are insulated from each other.

[0053] Understandably, the second heat-conducting element 150 helps to conduct heat from the central through hole 111 to the second collector 130, thereby further reducing the risk of local overheating at the central through hole 111 and thus helping to further improve the electrical performance of the cylindrical battery 100.

[0054] Meanwhile, since the first heat-conducting element 140 and the second heat-conducting element 150 are insulated, the risk of short circuit is reduced, thereby improving the safety of the cylindrical battery 100.

[0055] For example, the first metal material / second metal material can be aluminum, copper, nickel, iron, etc., without specific limitations.

[0056] It should be noted that when the electrode assembly 110 includes a first diaphragm 112, a first electrode 113, a second diaphragm 114, and a second electrode 115, the second electrode 115 is electrically connected to the second current collector 130 on one side along the first direction Z.

[0057] like Figure 4 and Figure 6 As shown, the second heat-conducting element 150 is further defined as a second heat-conducting wire 151, which is spirally arranged. This allows for a larger thermally conductive contact area between the second heat-conducting element 150 and the electrode assembly 110 while simultaneously reducing the weight of the second heat-conducting element 150, thereby contributing to an increase in the energy density of the cylindrical battery 100.

[0058] It should be noted that "the second heat-conducting wire 151 is spirally arranged" can be understood as: the electrode assembly 110 has a center line, and the second heat-conducting wire 151 is spirally distributed around the center line.

[0059] like Figure 2 and Figure 6As shown, the cylindrical battery 100 further includes a second direction X perpendicular to the first direction Z. The diameter of the central through hole 111 along the second direction X is D, and the outer diameter of the second heat-conducting wire 151 along the second direction X is d2, satisfying that d2 < D. This makes it easy for the second heat-conducting wire 151 to pass through the central through hole 111, thereby reducing the assembly difficulty of the second heat-conducting wire 151.

[0060] It should be noted that the outer diameter of the second heat-conducting wire 151 along the second direction X refers to the maximum diameter of the second heat-conducting wire 151 in the spiral state, that is, the distance from the outermost edge of one side to the outermost edge of the other side.

[0061] For example, the outer diameter of the second heating wire 151 along the second direction X can be measured by measuring tools such as vernier calipers, micrometers, and video measuring instruments.

[0062] like Figure 1 and Figure 4 As shown, the cylindrical battery 100 further includes an insulating component 160 passing through the central through hole 111. The insulating component 160 is disposed between the first heat-conducting element 140 and the second heat-conducting element 150 along the first direction Z, and the insulating component 160 is connected to the first heat-conducting element 140 and the second heat-conducting element 150 to achieve insulation protection for the first heat-conducting element 140 and the second heat-conducting element 150, thereby reducing the risk of short circuit.

[0063] like Figure 4 As shown, the insulation component 160 further includes a first insulating member 161 and a second insulating member 162. The first insulating member 161 is fixedly connected to one end of the first heat-conducting member 140 away from the first manifold 120 along the first direction Z, so as to achieve insulation protection for the first heat-conducting member 140. The second insulating member 162 is fixedly connected to one end of the second heat-conducting member 150 away from the second manifold 130 along the first direction Z, so as to achieve insulation protection for the second heat-conducting member 150.

[0064] For example, the materials of the first insulating element 161 and the second insulating element 162 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.

[0065] like Figure 4As shown, the insulating assembly 160 further includes an adhesive 163, which is bonded to the first insulating component 161 and the second insulating component 162 respectively, so as to realize the fixed connection between the first insulating component 161 and the second insulating component 162, thereby enhancing the stability of the first heat-conducting component 140 and the second heat-conducting component 150.

[0066] like Figures 4 to 6 As shown, the adhesive component 163 further includes a first adhesive layer 1631 and a second adhesive layer 1632 bonded together. The first adhesive layer 1631 is bonded to the first insulating component 161, and the second adhesive layer 1632 is bonded to the second insulating component 162. Thus, the above-described double-layer adhesive structure allows for better bonding and fixation, further enhancing the stability of the first thermally conductive component 140 and the second thermally conductive component 150.

[0067] like Figure 1 , Figure 4 and Figure 8 As shown, in some specific embodiments, the cylindrical battery 100 further includes a terminal post 172, and the housing 171 includes a shell 1711 and an end cap 1712. The end cap 1712 is connected to one end of the shell 1711 along a first direction Z, and the terminal post 172 passes through the end of the shell 1711 along the first direction Z away from the end cap 1712 and is insulated from the shell 1711. The second current collector 130 is electrically connected to the end cap 1712. In this way, one of the terminal post 172 and the end cap 1712 is the positive terminal of the external circuit, and the other of the terminal post 172 and the end cap 1712 is the negative terminal of the external circuit.

[0068] For example, the material of the end cap 1712 / the material of the housing 1711 can be aluminum, aluminum alloy, copper, iron, stainless steel, plastic, etc., and no specific limitation is made here.

[0069] In some other specific embodiments, the cylindrical battery 100 further includes a terminal 172, and the housing 171 includes a casing 1711 and an end cap 1712. The end cap 1712 is connected to one end of the casing 1711 along a first direction Z. The terminal 172 passes through the end cap 1712 and is insulated from the end cap 1712. The second current collector 130 is electrically connected to the casing 1711. In this way, one of the terminal 172 and the casing 1711 is the positive terminal of the external circuit, and the other of the terminal 172 and the casing 1711 is the negative terminal of the external circuit.

[0070] like Figure 1 , Figure 4 and Figure 9As shown, in some specific embodiments, the cylindrical battery 100 further includes a first terminal 173 and a second terminal 174. The first terminal 173 passes through one end of the outer casing 171 along the first direction Z, and the second terminal 174 passes through the end of the outer casing 171 along the first direction Z away from the first terminal 173. Both the first terminal 173 and the second terminal 174 are insulated from the outer casing 171. The first terminal 173 is electrically connected to the first current collector 120, and the second terminal 174 is electrically connected to the second current collector 130. Thus, one of the first terminal 173 and the second terminal 174 is the positive terminal of the external circuit, and the other of the first terminal 173 and the second terminal 174 is the negative terminal of the external circuit.

[0071] It should be noted that one of the first terminal 173 and the second terminal 174 is a positive terminal, and the other is a negative terminal. One of the first current collector 120 and the second current collector 130 is a positive current collector (the material can be aluminum), and the other of the first current collector 120 and the second current collector 130 is a negative current collector (the material can be copper, nickel, iron, etc.).

[0072] Based on this, when the electrode assembly 110 includes a first diaphragm 112, a first electrode 113, a second diaphragm 114, and a second electrode 115, one of the first electrode 113 and the second electrode 115 is a positive electrode, and the other is a negative electrode. The positive electrode includes a positive current collector and a positive active material layer, with the positive active material layer coated on the positive current collector. The positive current collector is electrically connected to the positive electrode post through a positive current collector disk. The negative electrode includes a negative current collector and a negative active material layer, with the negative active material layer coated on the negative current collector. The negative current collector is electrically connected to the negative electrode post through a negative current collector disk.

[0073] For example, taking lithium ions as the metal ion, 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.

[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, structures, 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, structures, materials, or characteristics described may be combined in any suitable manner in 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 first orientation (Z), characterized in that, include: Outer shell (171); An electrode assembly (110) is disposed within the housing (171), the electrode assembly (110) having a central through hole (111) extending along the first direction (Z). The first collector plate (120) is disposed inside the housing (171) and is electrically connected to one end of the electrode assembly (110) along the first direction (Z). A first heat-conducting element (140) is disposed through the central through hole (111). The first heat-conducting element (140) extends along the first direction (Z). One end of the first heat-conducting element (140) along the first direction (Z) is connected to the first collector plate (120).

2. The cylindrical battery according to claim 1, characterized in that, The first heat-conducting element (140) is a first heat-conducting wire (141), which is spirally arranged.

3. The cylindrical battery according to claim 2, characterized in that, The cylindrical battery also has a second direction (X) perpendicular to the first direction (Z), the diameter of the central through hole (111) along the second direction (X) is D, and the outer diameter of the first heat-conducting wire (141) along the second direction (X) is d1, satisfying: d1 < D.

4. The cylindrical battery according to claim 1, characterized in that, The electrode assembly (110) includes a first diaphragm (112), a first electrode (113), a second diaphragm (114), and a second electrode (115). The polarity of the first electrode (113) is opposite to that of the second electrode (115). The first diaphragm (112), the first electrode (113), the second diaphragm (114), and the second electrode (115) are sequentially stacked and wound together. The first electrode (113) is electrically connected to the first collector disk (120) on one side along the first direction (Z). The first diaphragm (112) forms the central through hole (111).

5. The cylindrical battery according to any one of claims 1 to 4, characterized in that, The first heat-conducting element (140) is made of insulating material. The cylindrical battery also includes a second current collector (130). The second current collector (130) is electrically connected to the end of the electrode assembly (110) away from the first current collector (120) along the first direction (Z). The polarity of the first current collector (120) is opposite to that of the second current collector (130). The end of the first heat-conducting element (140) away from the first current collector (120) along the first direction (Z) is connected to the second current collector (130).

6. The cylindrical battery according to any one of claims 1 to 4, characterized in that, The cylindrical battery further includes a second current collector (130) and a second heat conductor (150). The second current collector (130) is disposed inside the outer casing (171). The first heat conductor (140) is made of a first metal material, and the second heat conductor (150) is made of a second metal material. The second current collector (130) is electrically connected to one end of the electrode assembly (110) away from the first current collector (120) along the first direction (Z). The polarity of the first current collector (120) is opposite to that of the second current collector (130). The second heat conductor (150) passes through the central through hole (111) and extends along the first direction (Z). One end of the second heat conductor (150) along the first direction (Z) is connected to the second current collector (130). The first heat conductor (140) and the second heat conductor (150) are insulated from each other.

7. The cylindrical battery according to claim 6, characterized in that, The second heat-conducting element (150) is a second heat-conducting wire (151), which is spirally arranged.

8. The cylindrical battery according to claim 7, characterized in that, The cylindrical battery also has a second direction (X) perpendicular to the first direction (Z), the diameter of the central through hole (111) along the second direction (X) is D, and the outer diameter of the second heat-conducting wire (151) along the second direction (X) is d2, satisfying: d2 < D.

9. The cylindrical battery according to claim 6, characterized in that, The cylindrical battery also includes an insulating component (160) passing through the central through hole (111). The insulating component (160) is disposed between the first heat-conducting element (140) and the second heat-conducting element (150) along the first direction (Z), and the insulating component (160) is connected to the first heat-conducting element (140) and the second heat-conducting element (150).

10. The cylindrical battery according to claim 9, characterized in that, The insulating component (160) includes a first insulating element (161) and a second insulating element (162). The first insulating element (161) is fixedly connected to one end of the first heat-conducting element (140) away from the first manifold (120) along the first direction (Z). The second insulating element (162) is fixedly connected to one end of the second heat-conducting element (150) away from the second manifold (130) along the first direction (Z).

11. The cylindrical battery according to claim 10, characterized in that, The insulating component (160) further includes an adhesive (163) which is bonded to the first insulating component (161) and the second insulating component (162) respectively.

12. The cylindrical battery according to claim 11, characterized in that, The adhesive component (163) includes a first adhesive layer (1631) and a second adhesive layer (1632) bonded to each other. The first adhesive layer (1631) is bonded to the first insulating component (161), and the second adhesive layer (1632) is bonded to the second insulating component (162).

13. The cylindrical battery according to claim 6, characterized in that, The cylindrical battery also includes terminals (172), and the outer casing (171) includes a housing (1711) and an end cap (1712), the end cap (1712) being connected to one end of the housing (1711) along the first direction (Z); Wherein, the pole post (172) passes through the end of the housing (1711) along the first direction (Z) away from the end cap (1712) and is insulated from the housing (1711), and the second collector plate (130) is electrically connected to the end cap (1712); or, the pole post (172) passes through the end cap (1712) and is insulated from the end cap (1712), and the second collector plate (130) is electrically connected to the housing (1711).

14. The cylindrical battery according to claim 6, characterized in that, The cylindrical battery further includes a first terminal (173) and a second terminal (174). The first terminal (173) passes through one end of the outer casing (171) along the first direction (Z), and the second terminal (174) passes through one end of the outer casing (171) along the first direction (Z) away from the first terminal (173). The first terminal (173) and the second terminal (174) are both insulated from the outer casing (171). The first terminal (173) is electrically connected to the first current collector (120), and the second terminal (174) is electrically connected to the second current collector (130).

15. A battery pack, characterized in that, The cylindrical battery includes any one of claims 1 to 14.

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