Battery cell and battery pack
By using flexible conductive components and insulating buffer components in the battery cell design, the problem of electrode tab tearing under vibration conditions is solved, improving the safety and reliability of the battery cell.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-01-05
- Publication Date
- 2026-04-10
AI Technical Summary
Under vibration conditions, the tabs of a battery cell are easily torn due to the pull of the pins, affecting the safety and reliability of the battery cell.
The design employs flexible conductive components and insulating buffer components. The flexible conductive components absorb impact stress through deformation under force, while the insulating buffer components provide vibration reduction, reducing the risk of the electrode tab being pulled and torn. At the same time, it avoids damage and short circuits caused by hard contact between the electrode body and the end cap.
It improves the safety and reliability of individual battery cells under vibration conditions and reduces the risk of tab tearing, electrode damage and short circuit.
Smart Images
Figure CN121840131A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of battery technology, and in particular to a battery cell and a 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 related technologies, the tabs of the electrode assembly are electrically connected to the terminals via pins to conduct current. However, when the battery cell is under vibration, the tabs are easily torn by the pull of the pins under impact stress, which is detrimental to the safety and reliability of the battery cell. Summary of the Invention
[0004] In view of this, the purpose of this application is to provide a battery cell and a battery pack, which aims to solve the technical problem that the tabs are prone to tearing under impact stress.
[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 battery cell having a first direction and a second direction perpendicular to each other. The battery cell includes: a housing; an end cap connected to one end of the housing along the first direction; a terminal post passing through the end cap; an electrode assembly disposed within the housing, the electrode assembly including an electrode body and a tab connected to each other, the electrode body and the tab being arranged along the second direction; a flexible conductive element disposed within the housing, one end of the flexible conductive element being electrically connected to the terminal post, and the end of the flexible conductive element away from the terminal post being electrically connected to the tab; and a first insulating buffer element disposed within the housing, the first insulating buffer element being located on the side of the electrode body along the first direction near the end cap.
[0006] In some embodiments of the first aspect, the battery cell further includes an insulating member disposed within the housing, the insulating member being connected to the end cap along the first direction on the side near the electrode body, the first insulating buffer member including a first support portion and a first elastic portion connected to each other, the first support portion abutting against the electrode body, and the first elastic portion abutting against the insulating member.
[0007] In some embodiments of the first aspect, the first elastic portion includes a plurality of first spring sheets spaced apart along the second direction, the first spring sheets being connected to the first support portion, the first spring sheets being inclined relative to the second direction and abutting against the insulating member.
[0008] In some embodiments of the first aspect, the first support portion is provided with a plurality of first clearance holes extending along the first direction, the plurality of first clearance holes being arranged at intervals along the second direction, and one first spring piece corresponding to one first clearance hole; a portion of the first spring piece is located inside the first clearance hole, and the first spring piece is connected to the hole wall of the first clearance hole.
[0009] In some embodiments of the first aspect, the tilt directions of two adjacent first spring pieces along the second direction are opposite.
[0010] In some embodiments of the first aspect, the battery cell further includes a second insulating buffer disposed within the housing, the housing including a bottom wall disposed away from the end cap along the first direction, the second insulating buffer being located on the side of the electrode body close to the bottom wall along the first direction, the second insulating buffer including a second support portion and a second elastic portion connected to each other, the second support portion abutting against the electrode body, and the second elastic portion abutting against the bottom wall.
[0011] In some embodiments of the first aspect, the second elastic portion includes a plurality of second spring sheets spaced apart along the second direction, the second spring sheets being connected to the second support portion, the second spring sheets being inclined relative to the second direction and abutting against the bottom wall.
[0012] In some embodiments of the first aspect, the second support portion is provided with a plurality of second clearance holes extending along the first direction, the plurality of second clearance holes being arranged at intervals along the second direction, and one second spring piece corresponding to one second clearance hole; a portion of the second spring piece is located inside the second clearance hole, and the second spring piece is connected to the hole wall of the second clearance hole.
[0013] In some embodiments of the first aspect, the tilt directions of two adjacent second spring pieces along the second direction are opposite.
[0014] In some embodiments of the first aspect, the battery cell further has a third direction, wherein the first direction, the second direction, and the third direction are mutually perpendicular, and the battery cell further includes a first conductive element disposed within the housing, the first conductive element being located on the side of the end cap near the electrode body, the first conductive element being connected to the electrode post and the flexible conductive element respectively, and the flexible conductive element being electrically connected to the electrode post through the first conductive element.
[0015] In some embodiments of the first aspect, the battery cell further includes a second conductive element disposed within the housing, the second conductive element and the flexible conductive element being located on the same side of the tab along the third direction, the second conductive element being connected to the tab and the flexible conductive element respectively, and the flexible conductive element being electrically connected to the tab through the second conductive element.
[0016] In some embodiments of the first aspect, the flexible conductive element includes a first welded portion, a first bent portion, a second bent portion, and a second welded portion connected in sequence. The first welded portion is welded to the first conductive element, and the second welded portion is welded to the second conductive element. The first bent portion is bent along the third direction away from the tab, and the second bent portion is bent along the third direction towards the tab.
[0017] Secondly, embodiments of this application provide a battery pack including the battery cells described in any of the embodiments of the first aspect above.
[0018] The beneficial effects of this application are as follows: When the battery cell provided in this application is under vibration, the deformation of the flexible conductive component under stress can provide a vibration damping effect to absorb impact stress, thereby reducing the risk of the tab being torn due to tension while maintaining the electrical connection between the terminal and the tab, thus helping to improve the safety and reliability of the battery cell. The first insulating buffer can provide a vibration damping effect from the side of the electrode body close to the end cap along the first direction to further absorb impact stress, thereby further reducing the risk of the tab being torn due to tension, and reducing the risk of damage to the electrode body due to hard contact between the electrode body and the end cap, as well as the risk of short circuit due to the electrode body touching the end cap, thus helping to further improve the safety and reliability of the battery cell.
[0019] 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
[0020] 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.
[0021] Figure 1 A three-dimensional structural schematic diagram of a battery cell in an embodiment of this application is shown; Figure 2 It shows Figure 1 A schematic diagram of the exploded structure of a single battery cell; Figure 3 It shows Figure 2 A schematic diagram of the exploded structure when the battery cell is hidden in the casing; Figure 4 It shows Figure 3 A schematic diagram of the assembly structure of the middle electrode assembly, the first insulating buffer, and the second insulating buffer from one perspective.
[0022] Explanation of key component symbols: 100-Battery cell; 110-Housing; 111-Bottom wall; 112-Side wall; 120-End cap; 130-Terminal post; 140-Electrode assembly; 141-Electrode body; 142-Taper; 151-Flexible conductive element; 1511-First welded part; 1512-First bent part; 1513-Second bent part; 1514-Second welded part; 152-Insulating element; 160-First conductive element; 170-Second conductive element; 180-First insulating buffer element; 181-First support part; 1811-First clearance hole; 182-First elastic part; 1821-First spring piece; 190-Second insulating buffer element; 191-Second support part; 1911-Second clearance hole; 192-Second elastic part; 1921-Second spring piece; Z-First direction; X-Second direction; Y-Third direction. Detailed Implementation
[0023] 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.
[0024] 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.
[0025] 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.
[0026] 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.
[0027] In the description of this application, unless otherwise explicitly specified, the terms "installation," "connection," "attachment," etc., should be interpreted broadly. For example, they can refer to non-detachable connections (e.g., welding, riveting, magnetic connections, casting connections, chemical reaction connections, etc.), detachable connections (e.g., snap-fit connections, threaded connections, plug-in connections, etc.), or integrally formed structures (e.g., stamped structures, injection molded structures, 3D printed structures, die-casting structures, extruded structures, blow molded structures, etc.); they can refer to mechanical connections or electrical connections (e.g., welding, snap-fit connections, adhesive connections, threaded connections, etc.); they can refer to direct connections or indirect connections through an intermediate medium; they 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.
[0028] 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.
[0029] 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.
[0030] In the description of this application, the term "fixed connection" can be understood as: two objects whose relative positions remain unchanged under normal use conditions, that is, they will not easily undergo relative movement (e.g., relative rotation and relative movement).
[0031] The battery cell is an important component of the battery pack. In related technologies, the tabs of the electrode assembly are electrically connected to the terminals via pins to conduct current; however, when the battery cell is under vibration, the tabs are easily torn by the pulling of the pins under impact stress.
[0032] In addition, when a battery cell is under vibration, the electrode body is prone to damage due to hard contact with the end cap, and the electrode body is prone to short circuit due to contact with the end cap.
[0033] like Figure 1 As shown, to solve the above-mentioned technical problems, embodiments of this application provide a battery cell 100, which relates to the field of battery technology and is mainly applied to battery packs, so as to be indirectly applied to electrical devices and energy storage devices in the form of battery packs. Of course, the battery cell 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 battery cell 100 here.
[0034] It should be noted that the battery cell 100 mainly relies on the movement of metal ions between the positive and negative electrode plates to function. The battery cell 100 can be rectangular, cylindrical, flat, or other shapes. Classified by packaging method, the battery cell 100 can be a square battery, a cylindrical battery, a pouch battery, etc.; classified by the type of metal ions, the battery cell 100 can be a lithium-ion battery, a sodium-ion battery, etc.; classified by the physical state of the electrolyte, the battery cell 100 can be a liquid battery, i.e., using a liquid electrolyte (electrolyte); of course, the battery cell 100 can also be a solid-state battery, i.e., using a solid electrolyte, common materials include sulfide, oxide, or polymer electrolytes. Solid electrolytes can replace the separator and liquid electrolyte, combining ion conduction and isolation functions. Therefore, no specific limitation is made on the type of battery cell 100 here.
[0035] For example, electrical devices can be vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools. Vehicles can be gasoline-powered cars, natural gas-powered cars, new energy vehicles, etc., and new energy vehicles can be pure electric vehicles, hybrid electric vehicles, range-extended electric vehicles, etc.; spacecraft can be airplanes, rockets, space shuttles, drones, spacecraft, etc.; electric toys include stationary or mobile electric toys, such as 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, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers; energy storage devices include energy storage containers, energy storage cabinets, energy storage power stations, wind power generation devices, solar power generation devices, mobile power devices, temporary power supply devices, etc.; no specific limitations are made on the types of electrical devices and energy storage devices here.
[0036] like Figures 1 to 3 As shown, the battery cell 100 provided in this embodiment has a first direction Z and a second direction X that are perpendicular to each other. The battery cell 100 includes: a housing 110, an end cap 120, a terminal post 130, an electrode assembly 140, a flexible conductive element 151, and a first insulating buffer element 180.
[0037] The end cap 120 is connected to one end of the housing 110 along the first direction Z; the electrode post 130 passes through the end cap 120; the electrode assembly 140 is disposed inside the housing 110, and the electrode assembly 140 includes an electrode body 141 and an electrode tab 142 connected to each other, and the electrode body 141 and the electrode tab 142 are arranged along the second direction X; the flexible conductive element 151 is disposed inside the housing 110, one end of the flexible conductive element 151 is electrically connected to the electrode post 130, and the other end of the flexible conductive element 151 away from the electrode post 130 is electrically connected to the electrode tab 142; the first insulating buffer 180 is disposed inside the housing 110, and the first insulating buffer 180 is located on the side of the electrode body 141 along the first direction Z close to the end cap 120.
[0038] For example, the flexible conductive element 151 may be selected from components with flexible properties or that can be flexibly bent, such as wire harnesses (including wires and an insulating layer wrapped around the wires, such as copper wires, aluminum wires, nickel wires, silver wires, etc.) or metal conductive sheets.
[0039] For example, the material of the end cap 120 / the material of the housing 110 can be aluminum, aluminum alloy, copper, iron, stainless steel, plastic, etc., and no specific limitation is made here.
[0040] It is understood that when the battery cell 100 provided in this embodiment is under vibration, the deformation of the flexible conductive element 151 under stress can provide a vibration reduction effect to absorb impact stress, thereby reducing the risk of the tab 142 being torn due to tension while maintaining the electrical connection between the terminal post 130 and the tab 142, thus helping to improve the safety and reliability of the battery cell 100.
[0041] Meanwhile, the first insulating buffer 180 can provide a vibration damping effect from the side of the electrode body 141 close to the end cap 120 along the first direction Z to further absorb impact stress, thereby further reducing the risk of the tab 142 being torn due to being pulled, and reducing the risk of damage to the electrode body 141 due to hard contact between the electrode body 141 and the end cap 120, as well as reducing the risk of short circuit due to the electrode body 141 touching the end cap 120, thereby helping to further improve the safety and reliability of the battery cell 100.
[0042] For example, there are two pole posts 130 and two tabs 142. One of the pole posts 130 is a positive pole post and the other is a negative pole post. There are two tabs 142. One of the tabs 142 is a positive tab that is electrically connected to the positive pole post and the other is a negative tab that is electrically connected to the negative pole post. The electrode body 141 is located between the positive tab and the negative tab along the second direction X. Of course, the number of pole posts 130 and tabs 142 can also be set to other numbers, which are not specifically limited here.
[0043] It should be noted that the electrode assembly 140 can be manufactured by a winding process or a stacking process and includes a positive electrode sheet, a negative electrode sheet and an isolation layer. The isolation 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.
[0044] The positive electrode active material layer, the portion of the positive electrode current collector coated with the positive electrode active material layer, the negative electrode active material layer, and the portion of the negative electrode current collector coated with the negative electrode active material layer constitute the electrode body 141. 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.
[0045] 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.
[0046] like Figures 1 to 4As shown, in some embodiments, the battery cell 100 further includes an insulating member 152 disposed within the housing 110. The insulating member 152 is connected to the end cap 120 along the first direction Z on the side close to the electrode body 141. The first insulating buffer member 180 includes a first support portion 181 and a first elastic portion 182 connected to each other. The first support portion 181 abuts against the electrode body 141, and the first elastic portion 182 abuts against the insulating member 152.
[0047] Understandably, when the battery cell 100 is under vibration, the elastic deformation of the first elastic part 182 can provide a vibration damping effect from the side of the electrode body 141 close to the end cap 120 along the first direction Z to reduce the risk of the tab 142 tearing; the first support part 181 can evenly distribute the elastic force generated by the first elastic part 182 to the entire electrode body 141, thereby helping to enhance the vibration damping effect and further reduce the risk of the tab 142 tearing.
[0048] like Figures 1 to 4 As shown, the first elastic part 182 further includes a plurality of first spring pieces 1821 arranged at intervals along the second direction X. The first spring pieces 1821 are connected to the first support part 181. The first spring pieces 1821 are inclined relative to the second direction X and abut against the insulating member 152.
[0049] It is understandable that when the battery cell 100 is under vibration, the elastic deformation of the first spring 1821 can provide a vibration damping effect from the side of the electrode body 141 near the end cap 120 along the first direction Z to reduce the risk of the tab 142 tearing; by arranging multiple first springs 1821 at intervals along the second direction X, the electrode body 141 can be subjected to more balanced force, thereby helping to enhance the vibration damping effect.
[0050] like Figure 3 As shown, the first support portion 181 is further provided with a plurality of first clearance holes 1811 extending along the first direction Z. The plurality of first clearance holes 1811 are arranged at intervals along the second direction X. One first spring piece 1821 corresponds to one first clearance hole 1811. A portion of the first spring piece 1821 is located inside the first clearance hole 1811, and the first spring piece 1821 is connected to the hole wall of the first clearance hole 1811.
[0051] Understandably, the first clearance hole 1811 can avoid the first spring piece 1821, thereby providing the first spring piece 1821 with a larger elastic deformation space. In this way, when the battery cell 100 is under more intense vibration conditions, the first spring piece 1821 can absorb stronger impact stress through a higher degree of elastic deformation, thereby reducing the risk of the tab 142 tearing.
[0052] like Figure 1 and Figure 4As shown, further, the two adjacent first spring pieces 1821 along the second direction X have opposite tilt directions, which can make the first support 181 more evenly stressed to reduce the possibility of the first insulating buffer 180 shifting, thereby helping to enhance the stability of the first insulating buffer 180.
[0053] Of course, in other embodiments, the first elastic part 182 includes a plurality of first springs arranged at intervals along the second direction X. One end of the first spring is connected to the first support part 181 and the other end abuts against the insulating member 152, which can also provide a vibration damping effect. The structure of the first elastic part 182 is not specifically limited here.
[0054] like Figures 1 to 4 As shown, in some embodiments, the battery cell 100 further includes a second insulating buffer 190 disposed within the housing 110. The housing 110 includes a bottom wall 111 disposed along a first direction Z away from the end cap 120. The second insulating buffer 190 is located on the side of the electrode body 141 along the first direction Z close to the bottom wall 111. The second insulating buffer 190 includes a second support portion 191 and a second elastic portion 192 connected to each other. The second support portion 191 abuts against the electrode body 141, and the second elastic portion 192 abuts against the bottom wall 111.
[0055] For example, the materials of the insulating element 152, the first insulating buffer 180, and the second insulating buffer 190 can be selected from the following categories: 1. Synthetic organic insulating materials: plastics (e.g., polyethylene, polyvinyl chloride, polypropylene, polytetrafluoroethylene, epoxy resin, etc.), synthetic rubbers (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.
[0056] It is understandable that when the battery cell 100 is under vibration, the elastic deformation of the second elastic part 192 can provide a vibration damping effect from the side of the electrode body 141 along the first direction Z near the bottom wall 111 to reduce the risk of the tab 142 tearing; the second support part 191 can evenly distribute the elastic force generated by the second elastic part 192 to the entire electrode body 141, thereby helping to enhance the vibration damping effect and further reduce the risk of the tab 142 tearing.
[0057] like Figure 1 and Figure 4As shown, it should be noted that the dimensions of the first support portion 181 along the second direction X and the second support portion 191 along the second direction X can both be larger than the dimensions of the electrode body 141 along the second direction X. This allows the elastic force generated by the first elastic portion 182 and the elastic force generated by the second elastic portion 192 to be more evenly distributed throughout the entire electrode body 141, thereby providing a better vibration reduction effect for the electrode body 141.
[0058] like Figures 1 to 4 As shown, the second elastic part 192 further includes a plurality of second spring pieces 1921 arranged at intervals along the second direction X. The second spring pieces 1921 are connected to the second support part 191. The second spring pieces 1921 are inclined relative to the second direction X and abut against the bottom wall 111.
[0059] It is understandable that when the battery cell 100 is under vibration, the elastic deformation of the second spring 1921 can provide a vibration damping effect from the side of the electrode body 141 close to the bottom wall 111 along the first direction Z to reduce the risk of the tab 142 tearing; by arranging multiple second springs 1921 at intervals along the second direction X, the electrode body 141 can be subjected to more balanced force, thereby helping to enhance the vibration damping effect.
[0060] like Figure 3 As shown, the second support portion 191 is further provided with a plurality of second clearance holes 1911 extending along the first direction Z. The plurality of second clearance holes 1911 are arranged at intervals along the second direction X. One second spring piece 1921 corresponds to one second clearance hole 1911. A portion of the second spring piece 1921 is located inside the second clearance hole 1911, and the second spring piece 1921 is connected to the hole wall of the second clearance hole 1911.
[0061] Understandably, the second clearance hole 1911 can avoid the second spring piece 1921, thereby providing the second spring piece 1921 with a larger elastic deformation space. In this way, when the battery cell 100 is under more intense vibration conditions, the second spring piece 1921 can absorb stronger impact stress through a higher degree of elastic deformation, thereby reducing the risk of the tab 142 tearing.
[0062] like Figure 1 and Figure 4 As shown, furthermore, the two adjacent second spring pieces 1921 along the second direction X have opposite tilt directions, which can make the second support 191 more evenly stressed to reduce the possibility of the second insulating buffer 190 shifting, thereby helping to enhance the stability of the second insulating buffer 190.
[0063] Of course, in other embodiments, the second elastic part 192 includes a plurality of second springs arranged at intervals along the second direction X. One end of the second spring is connected to the second support part 191, and the other end abuts against the bottom wall 111, which can also provide a vibration reduction effect. The structure of the second elastic part 192 is not specifically limited here.
[0064] It should be noted that the housing 110 also includes a side wall 112 surrounding the electrode assembly 140. The side wall 112 is connected to the end cap 120 and the bottom wall 111 respectively. The side wall 112 and the bottom wall 111 together form a space to accommodate the electrode assembly 140.
[0065] like Figure 1 and Figure 2 As shown, in some embodiments, the battery cell 100 also has a third direction Y, and the first direction Z, the second direction X and the third direction Y are mutually perpendicular. The battery cell 100 also includes a first conductive element 160 disposed in the housing 110. The first conductive element 160 is located on the side of the end cap 120 near the electrode body 141. The first conductive element 160 is connected to the terminal post 130 and the flexible conductive element 151 respectively. The flexible conductive element 151 is electrically connected to the terminal post 130 through the first conductive element 160.
[0066] Understandably, the first conductive element 160 enables an indirect electrical connection between the flexible conductive element 151 and the terminal post 130, reducing the assembly difficulty of the flexible conductive element 151. Simultaneously, the presence of the first conductive element 160 helps shorten the length of the flexible conductive element 151, thereby reducing the risk of damage caused by interference from other structures due to excessive length.
[0067] It should be noted that when a portion of the first conductive element 160 extends along the second direction X, a portion of the first springs 1821 of the first insulating buffer 180 abut against the portion of the first conductive element 160 extending along the second direction X along the first direction Z, and the first support portion 181 of the first insulating buffer 180 is located between the electrode body 141 and the portion of the first conductive element 160 extending along the second direction X along the first direction Z. This can achieve insulation isolation between the portion of the first conductive element 160 extending along the second direction X and the electrode body 141 while providing vibration damping effect, thereby reducing the risk of short circuit when the electrode body 141 touches the portion of the first conductive element 160 extending along the second direction X.
[0068] It should be noted that when the battery cell 100 includes an insulating member 152, the insulating member 152 is disposed between the end cap 120 and the first conductive member 160 to achieve insulation isolation between the first conductive member 160 and the end cap 120, thereby reducing the risk of short circuit in the battery cell 100.
[0069] like Figures 1 to 3 As shown, the battery cell 100 further includes a second conductive element 170 disposed within the housing 110. The second conductive element 170 and the flexible conductive element 151 are located on the same side of the tab 142 along the third direction Y. The second conductive element 170 is connected to the tab 142 and the flexible conductive element 151 respectively. The flexible conductive element 151 is electrically connected to the tab 142 through the second conductive element 170.
[0070] For example, the materials of the first conductive element 160, the second conductive element 170, and the electrode 130 can be selected from metallic conductive materials (such as copper, aluminum, silver, gold, iron, nickel, etc.) or non-metallic conductive materials (such as carbon-based materials, superconductors, semiconductors, etc.), without specific limitations.
[0071] Understandably, the second conductive element 170 enables an indirect electrical connection between the flexible conductive element 151 and the tab 142, further reducing the assembly difficulty of the flexible conductive element 151. Simultaneously, the presence of the second conductive element 170 helps to further shorten the length of the flexible conductive element 151, thereby further reducing the risk of damage caused by interference from other structures due to excessive length.
[0072] Of course, in addition to indirect electrical connection, the flexible conductive element 151 can also be directly electrically connected to the pole post 130 and the tab 142 respectively, without specific limitations.
[0073] like Figures 1 to 3 As shown, the flexible conductive element 151 further includes a first welding portion 1511, a first bending portion 1512, a second bending portion 1513, and a second welding portion 1514 connected in sequence. The first welding portion 1511 is welded to the first conductive element 160, and the second welding portion 1514 is welded to the second conductive element 170. The first bending portion 1512 is bent along the third direction Y in a direction away from the electrode 142, and the second bending portion 1513 is bent along the third direction Y in a direction closer to the electrode 142.
[0074] It is understandable that by welding the first welding part 1511 to the first conductive element 160, a fixed connection and electrical connection between the flexible conductive element 151 and the first conductive element 160 are achieved. By welding the second welding part 1514 to the second conductive element 170, a fixed connection and electrical connection between the flexible conductive element 151 and the second conductive element 170 are achieved, thereby reducing the risk of the flexible conductive element 151 falling off from the first conductive element 160 and the second conductive element 170.
[0075] Meanwhile, by providing a first curved portion 1512 that bends away from the tab 142 and a second curved portion 1513 that bends towards the tab 142, space is reserved for the deformation of the flexible conductive element 151 under stress, thereby reducing the risk that the flexible conductive element 151 will have insufficient vibration reduction effect or even failure of vibration reduction effect due to excessive stretching under vibration conditions.
[0076] To address the aforementioned technical problems, embodiments of this application also provide a battery pack, including the battery cell 100 from any of the above embodiments.
[0077] It is understood that since the battery pack provided in this embodiment includes the battery cell 100 in any of the above embodiments, it has all the beneficial effects of the battery cell 100, which will not be described in detail here.
[0078] 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.
[0079] 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 battery cell, characterized in that, The battery cell has a first direction (Z) and a second direction (X) that are perpendicular to each other, and comprises: Casing (110); An end cap (120) is connected to one end of the housing (110) along the first direction (Z); The pole post (130) is inserted through the end cap (120); An electrode assembly (140) is disposed within the housing (110). The electrode assembly (140) includes an electrode body (141) and a tab (142) connected to each other. The electrode body (141) and the tab (142) are arranged along the second direction (X). A flexible conductive element (151) is disposed inside the housing (110). One end of the flexible conductive element (151) is electrically connected to the pole post (130), and the other end of the flexible conductive element (151) away from the pole post (130) is electrically connected to the tab (142). A first insulating buffer (180) is disposed inside the housing (110), and the first insulating buffer (180) is located on the side of the electrode body (141) along the first direction (Z) close to the end cap (120).
2. The battery cell according to claim 1, characterized in that, The battery cell also includes an insulating member (152) disposed in the housing (110). The insulating member (152) is connected to the end cap (120) along the first direction (Z) near the electrode body (141). The first insulating buffer member (180) includes a first support portion (181) and a first elastic portion (182) connected to each other. The first support portion (181) abuts against the electrode body (141), and the first elastic portion (182) abuts against the insulating member (152).
3. The battery cell according to claim 2, characterized in that, The first elastic part (182) includes a plurality of first spring pieces (1821) arranged at intervals along the second direction (X). The first spring pieces (1821) are connected to the first support part (181). The first spring pieces (1821) are inclined relative to the second direction (X) and abut against the insulating member (152).
4. The battery cell according to claim 3, characterized in that, The first support portion (181) is provided with a plurality of first clearance holes (1811) extending along the first direction (Z), and the plurality of first clearance holes (1811) are arranged at intervals along the second direction (X). One first spring piece (1821) corresponds to one first clearance hole (1811). A portion of the first spring piece (1821) is located inside the first clearance hole (1811), and the first spring piece (1821) is connected to the hole wall of the first clearance hole (1811).
5. The battery cell according to claim 3, characterized in that, The two adjacent first spring pieces (1821) along the second direction (X) have opposite tilt directions.
6. The battery cell according to any one of claims 1 to 5, characterized in that, The battery cell further includes a second insulating buffer (190) disposed within the housing (110). The housing (110) includes a bottom wall (111) disposed along the first direction (Z) away from the end cap (120). The second insulating buffer (190) is located on the side of the electrode body (141) along the first direction (Z) close to the bottom wall (111). The second insulating buffer (190) includes a second support portion (191) and a second elastic portion (192) connected to each other. The second support portion (191) abuts against the electrode body (141), and the second elastic portion (192) abuts against the bottom wall (111).
7. The battery cell according to claim 6, characterized in that, The second elastic part (192) includes a plurality of second spring pieces (1921) arranged at intervals along the second direction (X). The second spring pieces (1921) are connected to the second support part (191). The second spring pieces (1921) are inclined relative to the second direction (X) and abut against the bottom wall (111).
8. The battery cell according to claim 7, characterized in that, The second support part (191) is provided with a plurality of second clearance holes (1911) extending along the first direction (Z). The plurality of second clearance holes (1911) are arranged at intervals along the second direction (X). One second spring piece (1921) corresponds to one second clearance hole (1911). A portion of the second spring piece (1921) is located inside the second clearance hole (1911), and the second spring piece (1921) is connected to the hole wall of the second clearance hole (1911).
9. The battery cell according to claim 7, characterized in that, The two adjacent second spring pieces (1921) along the second direction (X) have opposite tilt directions.
10. The battery cell according to any one of claims 1 to 5, characterized in that, The battery cell also has a third direction (Y), and the first direction (Z), the second direction (X) and the third direction (Y) are perpendicular to each other. The battery cell also includes a first conductive element (160) disposed in the housing (110). The first conductive element (160) is located on the side of the end cap (120) near the electrode body (141). The first conductive element (160) is connected to the pole post (130) and the flexible conductive element (151) respectively. The flexible conductive element (151) is electrically connected to the pole post (130) through the first conductive element (160).
11. The battery cell according to claim 10, characterized in that, The battery cell also includes a second conductive element (170) disposed in the housing (110). The second conductive element (170) and the flexible conductive element (151) are located on the same side of the tab (142) along the third direction (Y). The second conductive element (170) is connected to the tab (142) and the flexible conductive element (151) respectively. The flexible conductive element (151) is electrically connected to the tab (142) through the second conductive element (170).
12. The battery cell according to claim 11, characterized in that, The flexible conductive element (151) includes a first welded portion (1511), a first bent portion (1512), a second bent portion (1513), and a second welded portion (1514) connected in sequence. The first welded portion (1511) is welded to the first conductive element (160), and the second welded portion (1514) is welded to the second conductive element (170). The first bent portion (1512) is bent away from the tab (142) along the third direction (Y), and the second bent portion (1513) is bent closer to the tab (142) along the third direction (Y).
13. A battery pack, characterized in that, Includes the battery cell according to any one of claims 1 to 12.