A battery cell and a battery pack

Abstract

This application provides a battery cell and a battery pack, relating to the field of battery technology. The battery cell includes: a housing, an end cap connected to the housing, a terminal post passing through the end cap, an electrode assembly disposed within the housing, a conductive element disposed within the housing, a sealing element surrounding the terminal post, and an insulating and heat-insulating element disposed within the housing. The conductive element is located between the end cap and the electrode assembly, and is connected to both the terminal post and the electrode assembly. A portion of the sealing element is disposed on the side of the end cap away from the electrode assembly. The insulating and heat-insulating element is located on the side of the end cap closer to the electrode assembly, and is disposed between the sealing element and the conductive element. The battery cell provided in this application, through the insulating and heat-insulating element, can isolate some heat radiation, thereby reducing the adverse effects of heat generated during welding of the conductive element and the terminal post on the sealing element, thus improving the sealing reliability of the battery cell.

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] The battery cell is a crucial component of the battery pack. In related technologies, when manufacturing a battery cell, conductive components are connected to the electrode assembly and the terminal block respectively to achieve electrical connection between the electrode assembly and the terminal block. However, the connection between the conductive components and the terminal block is achieved by welding, and the heat generated by welding can easily be transferred to the sealing components, causing damage to the sealing components and thus affecting the sealing reliability of the battery cell. Utility Model Content

[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 of how to improve the sealing reliability of the battery cell.

[0005] To achieve the above objectives, the technical solution adopted in this application is as follows:

[0006] In a first aspect, embodiments of this application provide a single battery cell, comprising:

[0007] case;

[0008] End cap, connected to the housing;

[0009] The pole post is inserted into the end cap;

[0010] An electrode assembly is disposed within the housing; a conductive element is disposed within the housing, the conductive element being located between the end cap and the electrode assembly, and being connected to the pole post and the electrode assembly respectively;

[0011] A seal is disposed around the electrode post, with a portion of the seal disposed on the side of the end cap away from the electrode assembly;

[0012] An insulating and heat-insulating component is disposed within the housing, located on the side of the end cap near the electrode assembly, and positioned between the sealing component and the conductive component.

[0013] In some embodiments of the first aspect, the battery cell has a first orientation, the battery cell further includes a first insulating member disposed within the housing, the first insulating member being connected to the end cap on the side near the electrode assembly, the first insulating member having a first through hole extending along the first orientation, the electrode post passing through the first through hole, and at least a portion of the insulating and heat-insulating member being disposed within the first through hole.

[0014] In some embodiments of the first aspect, the end cap is provided with a positioning groove communicating with the first through hole on the side near the electrode assembly, and a portion of the first insulating member is located within the positioning groove.

[0015] In some embodiments of the first aspect, the insulating heat insulation element is interference-fitted with the first through hole.

[0016] In some embodiments of the first aspect, the battery cell has a first orientation, and the battery cell further includes a second insulating member disposed outside the housing, the second insulating member being located on the side of the end cap away from the electrode assembly and disposed between the end cap and the terminal post; the second insulating member is provided with a second through hole extending along the first orientation, the terminal post being disposed through the second through hole, and the portion of the sealing member located on the end cap away from the electrode assembly being disposed within the second through hole.

[0017] In some embodiments of the first aspect, the end cap is provided with a third through hole extending along the first direction, the third through hole communicating with the second through hole, the pole post passing through the third through hole, and a portion of the seal being disposed within the third through hole.

[0018] In some embodiments of the first aspect, the battery cell has a first direction and a projection plane perpendicular to the first direction, the insulating heat insulation member is disposed around the electrode post, and the orthogonal projection of the insulating heat insulation member on the projection plane completely covers the orthogonal projection of the seal member on the projection plane.

[0019] In some embodiments of the first aspect, the electrode post includes a negative electrode post, the negative electrode post including a first electrode post portion and a second electrode post portion, the first electrode post portion passing through the end cap, the conductive element surrounding the first electrode post portion and connected to the first electrode post portion, the first electrode post portion being made of copper; the second electrode post portion being connected to the end of the first electrode post portion away from the electrode assembly, the second electrode post portion being made of aluminum.

[0020] In some embodiments of the first aspect, the insulating heat insulation member includes a heat insulation layer and a sealing layer stacked on top of each other, the heat insulation layer being located on the side of the conductive member closer to the sealing member, and the sealing layer being located on the side of the heat insulation layer closer to the sealing member.

[0021] Secondly, embodiments of this application provide a battery pack including the battery cells described in any of the embodiments of the first aspect above.

[0022] The beneficial effects of this application are as follows:

[0023] The battery cell provided in this application has a sealing element surrounding the electrode post, with a portion of it located on the side of the end cap away from the electrode assembly. Meanwhile, an insulating and heat-insulating element is located inside the housing, on the side of the end cap closer to the electrode assembly, and positioned between the sealing element and the conductive element. The aforementioned insulating and heat-insulating element can isolate some heat radiation, thereby reducing the adverse effects of the heat generated during welding on the sealing element and improving the sealing reliability of the battery cell.

[0024] 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

[0025] 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.

[0026] Figure 1 A three-dimensional structural schematic diagram of a battery cell is shown in some embodiments of this application;

[0027] Figure 2 It shows Figure 1 A schematic diagram of the decomposed structure;

[0028] Figure 3 It shows Figure 1 Exploded view of the middle cover assembly;

[0029] Figure 4 It shows Figure 1 A schematic diagram of the mid-end cover assembly from one perspective;

[0030] Figure 5 It shows Figure 4 Schematic diagram of the cross-sectional structure at point AA;

[0031] Figure 6 It shows Figure 5A magnified structural diagram of region B in the middle;

[0032] Figure 7 The diagram shows a cross-sectional view of the insulating and heat-insulating components of a battery cell in some other embodiments of this application.

[0033] Explanation of key component symbols:

[0034] 1000-Battery cell; 100-Housing; 200-Electrode assembly; 210-Electrode body; 220-Taper; 300-End cap assembly; 310-End cap; 311-Positioning groove; 312-Third through hole; 320-Terminal post; 321-First terminal post; 322-Second terminal post; 330-Conductive component; 340-Sealing component; 350-Insulating and heat-insulating component; 351-Heat insulation layer; 352-Sealing layer; 360-First insulating component; 361-First through hole; 370-Second insulating component; 371-Second through hole; 380-Explosion-proof valve; 390-Protective sheet; 400-Insulating film; Z-First direction; Y-Second direction; X-Third direction; S-Projection plane. Detailed Implementation

[0035] 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.

[0036] 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.

[0037] 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," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0038] 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, "multiple" means two or more, unless otherwise explicitly defined.

[0039] In the description of this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "attachment," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection 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.

[0040] In the description of this application, the term "and / or" indicates that three relationships can exist. For example, A and / or B can represent three cases: A alone, A and B simultaneously, and B alone. Additionally, the character " / " generally indicates that the preceding and following objects have an "or" relationship.

[0041] 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.

[0042] Battery cells are a crucial component of battery packs. In related technologies, when manufacturing battery cells, conductive components are connected to electrode assemblies and terminals to achieve electrical connection between them. However, the connection between the conductive components and terminals is achieved through welding, and the heat generated during welding can easily be transferred to the seals, causing damage and reducing their sealing performance, thus affecting the sealing reliability of the battery cell.

[0043] like Figure 1 and Figure 2As shown, in order to solve the above-mentioned technical problems, embodiments of this application provide a battery cell 1000, which relates to the field of battery technology and is mainly used in battery packs, so as to be indirectly applied to electrical devices or energy storage devices in the form of battery packs. Of course, the battery cell 1000 can also be directly applied to electrical devices or energy storage devices without taking the form of battery packs, and no specific limitation is made to the application scenarios of the battery cell 1000 here.

[0044] 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, and range-extended electric vehicles, etc.; spacecraft can be airplanes, rockets, space shuttles, drones, and spacecraft, etc.; electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc.; 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, etc.; 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, and temporary power supply devices, etc.; no specific limitations are made on the types of electrical devices and energy storage devices here.

[0045] Combination Figures 4 to 6 As shown, the battery cell 1000 provided in this embodiment includes: a housing 100, an end cap assembly 300, a terminal post 320, an electrode assembly 200, a conductive element 330, a sealing element 340, and an insulating and heat-insulating element 350. The end cap assembly 300 includes an end cap 310.

[0046] The end cap 310 is connected to the housing 100; the electrode post 320 passes through the end cap 310; the electrode assembly 200 is disposed inside the housing 100; the conductive element 330 is disposed inside the housing 100, located between the end cap 310 and the electrode assembly 200, and is connected to the electrode post 320 and the electrode assembly 200 respectively; the sealing element 340 is disposed around the electrode post 320, and a portion of the sealing element 340 is disposed on the side of the end cap 310 away from the electrode assembly 200; the insulating and heat-insulating element 350 is disposed inside the housing 100, located on the side of the end cap 310 close to the electrode assembly 200, and is disposed between the sealing element 340 and the conductive element 330.

[0047] It should be noted that the connection between the conductive element 330 and the electrode post 320 is welding, and the connection between the conductive element 330 and the electrode assembly 200 can be welding, snap-fitting, bonding, screw connection, etc., without specific limitations. For example, the number of electrode assemblies 200 can be one or more, without specific limitations.

[0048] It is understood that in the battery cell 1000 provided in this embodiment, the sealing element 340 is arranged around the terminal post 320, and a portion of it is arranged on the side of the end cap 310 away from the electrode assembly 200. At the same time, the insulating and heat-insulating element 350 is arranged inside the housing 100. The insulating and heat-insulating element 350 is located on the side of the end cap 310 close to the electrode assembly 200 and is arranged between the sealing element 340 and the conductive element 330. The insulating and heat-insulating element 350 can isolate part of the heat radiation, thereby reducing the adverse effect of the heat generated by welding the conductive element 330 and the terminal post 320 on the sealing element 340, thereby improving the sealing reliability of the battery cell 1000.

[0049] Meanwhile, the insulating and heat-insulating component 350 is located on the side of the end cover 310 close to the electrode assembly 200, which can also insulate the end cover 310 and the electrode assembly 200, thereby reducing the risk of short circuit in the battery cell 1000.

[0050] like Figure 2 and Figure 3 As shown, in some embodiments, the battery cell 1000 has a first direction Z, and the end cap assembly 300 further includes a first insulating member 360 disposed in the housing 100. The first insulating member 360 is connected to the side of the end cap 310 near the electrode assembly 200. The first insulating member 360 is provided with a first through hole 361 extending along the first direction Z. The electrode post 320 passes through the first through hole 361, and at least a portion of the insulating and heat-insulating member 350 is disposed in the first through hole 361.

[0051] Understandably, since the first insulating member 360 is connected to the end cap 310 on the side close to the electrode assembly 200, the end cap 310 and the electrode assembly 200 are insulated from each other, reducing the risk of short circuit in the battery cell 1000. The first through hole 361 facilitates the assembly of the insulating and heat-insulating member 350 and reduces the possibility of the insulating and heat-insulating member 350 moving relative to the conductive member 330, thereby enhancing the stability of the insulating and heat-insulating member 350.

[0052] like Figures 4 to 6 As shown, the end cap 310 is further provided with a positioning groove 311 communicating with the first through hole 361 on the side near the electrode assembly 200, and a part of the first insulating member 360 is located in the positioning groove 311.

[0053] It is understandable that the positioning groove 311 is used to position the first insulating component 360, thereby facilitating the assembly of the first insulating component 360 and reducing the possibility of the first insulating component 360 moving relative to the end cap 310, thus enhancing the stability of the first insulating component 360 and the insulating and heat-insulating component 350.

[0054] Furthermore, the insulating and heat-insulating component 350 is interference-fitted with the first through hole 361, so that the insulating and heat-insulating component 350 and the first insulating component 360 are in close contact, thereby further enhancing the stability of the insulating and heat-insulating component 350.

[0055] like Figure 2 , Figure 3 and Figure 6 As shown, in some embodiments, the battery cell 1000 has a first direction Z, and the end cap assembly 300 further includes a second insulating member 370 disposed outside the housing 100. The second insulating member 370 is located on the side of the end cap 310 away from the electrode assembly 200 and is disposed between the end cap 310 and the terminal post 320. The second insulating member 370 is provided with a second through hole 371 extending along the first direction Z, the terminal post 320 passes through the second through hole 371, and the sealing member 340 is located in the second through hole 371, a portion of the end cap 310 away from the electrode assembly 200.

[0056] Understandably, since the second insulating member 370 is located on the side of the end cap 310 away from the electrode assembly 200 and is disposed between the end cap 310 and the terminal post 320, the end cap 310 and the terminal post 320 are insulated from each other, reducing the risk of short circuit in the battery cell 1000.

[0057] Meanwhile, since the sealing element 340 is located in the second through hole 371, which is a part of the end cap 310 away from the electrode assembly 200, it can seal the gap between the pole post 320 and the end cap 310, thereby improving the airtightness of the battery cell 1000.

[0058] like Figures 4 to 6 As shown, the end cap 310 is further provided with a third through hole 312 extending along the first direction Z. The third through hole 312 is connected to the second through hole 371. The pole post 320 passes through the third through hole 312, and a part of the seal 340 is disposed in the third through hole 312.

[0059] Understandably, by placing a portion of the seal 340 within the third through hole 312, the gap between the terminal post 320 and the end cap 310 can be further sealed, thereby further improving the airtightness of the battery cell 1000.

[0060] It should be noted that "a portion of the seal 340 is located on the side of the end cap 310 away from the electrode assembly 200, a portion of the seal 340 is disposed in the third through hole 312, and a portion of the seal 340 located on the end cap 310 away from the electrode assembly 200 is disposed in the second through hole 371" can be understood as: the seal 340 is divided into two parts, one part is located on the side of the end cap 310 away from the electrode assembly 200 and is disposed in the second through hole 371, and the other part is disposed in the third through hole 312.

[0061] like Figure 2 and Figure 6 As shown, in some embodiments, the battery cell 1000 has a first direction Z and a projection plane S perpendicular to the first direction Z. The insulating heat insulation member 350 is disposed around the pole post 320, and the orthogonal projection of the insulating heat insulation member 350 on the projection plane S completely covers the orthogonal projection of the seal member 340 on the projection plane S.

[0062] For example, the projection plane S can be the side surface of the pole post 320 away from the electrode assembly 200, or the side surface of the end cap 310 away from the electrode assembly 200, without any specific limitation.

[0063] It is understandable that, since the orthogonal projection of the insulating and heat-insulating component 350 on the projection plane S completely covers the orthogonal projection of the sealing component 340 on the projection plane S, that is, the insulating and heat-insulating component 350 completely blocks the sealing component 340, the possibility of heat generated when the conductive component 330 is welded to the pole 320 being transferred to the sealing component 340 is further reduced.

[0064] like Figures 4 to 6 As shown, in some embodiments, the electrode post 320 includes a negative electrode post, which includes a first electrode post portion 321 and a second electrode post portion 322. The first electrode post portion 321 passes through the end cap 310, and the conductive element 330 is disposed around the first electrode post portion 321 and connected to it. The first electrode post portion 321 is made of copper. The second electrode post portion 322 is connected to the end of the first electrode post portion 321 away from the electrode assembly 200, and is made of aluminum. The first electrode post portion 321 and the second electrode post portion 322 can be connected by friction welding, or they can be formed in combination. This reduces the need for friction welding between the first electrode post portion 321 and the second electrode post portion 322, thus reducing the copper-aluminum interface failure rate caused by friction welding.

[0065] It should be noted that when the electrode post 320 includes a negative electrode post, the negative electrode post includes the first electrode post portion 321 and the second electrode post portion 322 mentioned above. In this case, the material of the first electrode post portion 321 can be copper, and the material of the second electrode post portion 322 can be aluminum.

[0066] It should be noted that since both the conductive element 330 and the insulating and heat-insulating element 350 are arranged around the first electrode post 321, that is, both the conductive element 330 and the insulating and heat-insulating element 350 are annular, the current-carrying area between the electrode post 320 and the conductive element 330 can be increased, thereby improving the current-carrying capacity of the battery cell 1000.

[0067] like Figure 6 and Figure 7 As shown, in some embodiments, the insulating heat insulation member 350 includes a heat insulation layer 351 and a sealing layer 352 stacked on each other. The heat insulation layer 351 is located on the side of the conductive member 330 near the sealing member 340, and the sealing layer 352 is located on the side of the heat insulation layer 351 near the sealing member 340.

[0068] Understandably, the heat insulation layer 351 can isolate some of the heat radiation, thereby reducing the adverse effects of the heat generated during welding on the seal 340 and improving the sealing reliability of the battery cell 1000. The combination of the sealing layer 352 and the seal 340 can better seal the gap between the terminal post 320 and the end cap 310, further improving the sealing reliability of the battery cell 1000.

[0069] Of course, in other embodiments, the insulating and heat-insulating component 350 can also be an integral structure, and the material can be liquid crystal polymer (LCP) or polyether ether ketone (PEEK). Since liquid crystal polymer and polyether ether ketone are more resistant to high temperature and electrolyte corrosion, choosing one of them as the material of the insulating and heat-insulating component 350 can better protect the seal 340 from the effects of high temperature and the corrosion of electrolyte inside the casing 100, thereby further improving the sealing reliability of the battery cell 1000.

[0070] like Figures 1 to 3 As shown, in some embodiments, the battery cell 1000 further includes an insulating film 400, which is disposed inside the housing 100 and covers the electrode assembly 200 to insulate the electrode assembly 200 from the housing 100. The end cap assembly 300 also includes an explosion-proof valve 380 and a protective plate 390, both of which are disposed on the end cap 310. The protective plate 390 has a vent hole and is located on the side of the explosion-proof valve 380 away from the electrode assembly 200 to protect the explosion-proof valve 380 and reduce the adverse effects of the external environment on the explosion-proof valve 380. When the battery cell 1000 experiences thermal runaway, the explosion-proof valve 380 opens, and high-temperature and high-pressure gas is discharged from the housing 100 through the explosion-proof valve 380 and impacts the protective plate 390, causing the protective plate 390 to tear, thereby achieving pressure relief.

[0071] It should be noted that the materials of the end cap 310 and / or the housing 100 can be aluminum, aluminum alloy, copper, iron, stainless steel, plastic, etc., without specific limitations. The materials of the conductive component 330 can be metallic conductive materials (e.g., copper, aluminum, silver, gold, iron, nickel, etc.) or non-metallic conductive materials (e.g., carbon-based materials, superconductors, semiconductors, etc.), without specific limitations. The materials of the first insulating component 360 and / or the second insulating component 370 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. The materials for the seal 340 and / or the sealing layer 352 can be nitrile rubber, fluororubber, silicone rubber, ethylene propylene rubber, polytetrafluoroethylene, polyurethane, natural rubber, etc., without specific limitations. The insulating film 400 can be Mylar film (biaxially oriented polyester film made of polyethylene terephthalate), polypropylene film, polyethylene film, polyvinyl chloride film, polycarbonate film, etc., without specific limitations.

[0072] It should be noted that the battery cell 1000 provided in this embodiment mainly relies on the movement of metal ions between the positive and negative electrode plates to operate. The battery cell 1000 can be cuboid, cylindrical, flat, or other shapes, and is not specifically limited here. According to the packaging method, the battery cell 1000 provided in this embodiment can be a square battery cell 1000, a cylindrical battery cell 1000, a pouch battery cell 1000, etc., and is not specifically limited here.

[0073] Furthermore, according to the classification of the physical state of the electrolyte, the battery cell 1000 provided in this embodiment can be a liquid battery, that is, it uses a liquid electrolyte. Exemplarily, the electrode post 320 may include a positive electrode post and a negative electrode post. The electrode assembly 200 may be manufactured using a winding process or a stacking process. The electrode assembly 200 may include an electrode body 210 and tabs 220. The tabs 220 include a positive tab and a negative tab. The electrode body 210 is immersed in the liquid electrolyte and includes a positive electrode sheet, a negative electrode sheet, and a separator layer. The separator layer is disposed between the positive electrode sheet and the negative electrode sheet. The material of the separator layer can be PP (polypropylene), PE (polyethylene), etc. The positive electrode sheet includes a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive current collector. The positive tab is connected to the positive current collector and to the positive electrode post. The negative electrode sheet includes a negative current collector and a negative active material layer. The negative active material layer is coated on the surface of the negative current collector. The negative tab is connected to the negative current collector and to the negative electrode post. Taking lithium ions as an example, the materials for the positive electrode current collector and the positive electrode tab can be aluminum, and the materials for the positive electrode active material layer can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, lithium manganese oxide, etc.; the materials for the negative electrode current collector and the negative electrode tab can be copper, and the negative electrode active material can be graphite, silicon, etc.

[0074] Of course, the battery cell 1000 provided in this embodiment can also be a solid-state battery, that is, it uses a solid electrolyte, such as sulfide, oxide or polymer electrolyte. Solid electrolyte can replace the separator and liquid electrolyte, and has both ion conduction and isolation functions. The type of battery cell 1000 is not specifically limited here.

[0075] It should be noted that when the battery cell 1000 has two mutually perpendicular directions, namely the first direction Z, the second direction Y, and the third direction X, the positive and negative terminals are spaced apart along the third direction X, the multiple electrode assemblies 200 are arranged along the second direction Y, the end cap 310 is located on one side of the housing 100 along the first direction Z, the conductive element 330 is located between the end cap 310 and the electrode assembly 200 along the first direction Z, and the insulating and heat-insulating element 350 is located on the side of the end cap 310 near the electrode assembly 200 along the first direction Z, and is arranged between the sealing element 340 and the conductive element 330 along the first direction Z.

[0076] To address the aforementioned technical problems, embodiments of this application also provide a battery pack, including the battery cell 1000 from any of the above embodiments.

[0077] It is understood that since the battery pack provided in this embodiment has the battery cell 1000 in any of the above embodiments, it has all the beneficial effects of the battery cell 1000, which will not be described in detail here.

[0078] In the description of this specification, the references to terms such as "some embodiments," "one embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, 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, include: Casing (100); End cap (310) is connected to the housing (100); The pole post (320) is inserted through the end cap (310); An electrode assembly (200) is disposed within the housing (100); A conductive element (330) is disposed inside the housing (100). The conductive element (330) is located between the end cap (310) and the electrode assembly (200), and is connected to the pole post (320) and the electrode assembly (200) respectively. A seal (340) is disposed around the pole post (320), and a portion of the seal (340) is disposed on the side of the end cap (310) away from the electrode assembly (200); An insulating heat insulation element (350) is disposed within the housing (100). The insulating heat insulation element (350) is located on the side of the end cap (310) near the electrode assembly (200) and is disposed between the sealing element (340) and the conductive element (330).

2. The battery cell according to claim 1, characterized in that, The battery cell has a first direction (Z), and the battery cell also includes a first insulating member (360) disposed in the housing (100). The first insulating member (360) is connected to the end cap (310) on the side near the electrode assembly (200). The first insulating member (360) is provided with a first through hole (361) extending along the first direction (Z). The electrode post (320) passes through the first through hole (361). At least a portion of the insulating and heat-insulating member (350) is disposed in the first through hole (361).

3. The battery cell according to claim 2, characterized in that, The end cap (310) is provided with a positioning groove (311) communicating with the first through hole (361) on the side near the electrode assembly (200), and a part of the first insulating member (360) is located in the positioning groove (311).

4. The battery cell according to claim 2, characterized in that, The insulating and heat-insulating component (350) is interference-fitted with the first through hole (361).

5. The battery cell according to claim 1, characterized in that, The battery cell has a first direction (Z), and the battery cell further includes a second insulating member (370) disposed outside the housing (100). The second insulating member (370) is located on the side of the end cap (310) away from the electrode assembly (200) and is disposed between the end cap (310) and the terminal post (320). The second insulating member (370) is provided with a second through hole (371) extending along the first direction (Z). The terminal post (320) passes through the second through hole (371). The portion of the sealing member (340) located on the end cap (310) away from the electrode assembly (200) is disposed in the second through hole (371).

6. The battery cell according to claim 5, characterized in that, The end cap (310) is provided with a third through hole (312) extending along the first direction (Z), the third through hole (312) is connected to the second through hole (371), the pole post (320) passes through the third through hole (312), and a part of the sealing member (340) is disposed in the third through hole (312).

7. The battery cell according to any one of claims 1 to 5, characterized in that, The battery cell has a first direction (Z) and a projection plane (S) perpendicular to the first direction (Z). The insulating heat insulation member (350) is arranged around the pole post (320). The orthographic projection of the insulating heat insulation member (350) on the projection plane (S) completely covers the orthographic projection of the seal member (340) on the projection plane (S).

8. The battery cell according to any one of claims 1 to 5, characterized in that, The electrode post (320) includes a negative electrode post, which includes a first electrode post portion (321) and a second electrode post portion (322). The first electrode post portion (321) is inserted through the end cap (310). The conductive element (330) is arranged around the first electrode post portion (321) and connected to the first electrode post portion (321). The first electrode post portion (321) is made of copper. The second electrode post portion (322) is connected to the end of the first electrode post portion (321) away from the electrode assembly (200). The second electrode post portion (322) is made of aluminum.

9. The battery cell according to any one of claims 1 to 5, characterized in that, The insulating and heat-insulating component (350) includes a heat-insulating layer (351) and a sealing layer (352) stacked on each other. The heat-insulating layer (351) is located on the side of the conductive component (330) near the sealing component (340), and the sealing layer (352) is located on the side of the heat-insulating layer (351) near the sealing component (340).

10. A battery pack, characterized in that, Includes the battery cell according to any one of claims 1 to 9.

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