Battery cell, battery device, and electric device

Abstract

Embodiments of the present application provide a battery monomer, a battery device and a power consumption device. The battery monomer comprises a shell, an electrode terminal, a first insulating piece and a second insulating piece. The shell comprises a first wall, the first wall is provided with an electrode lead-out hole; the electrode terminal is arranged on the first wall, the electrode terminal comprises a main body part and a flange part, the main body part is arranged in the electrode lead-out hole, the flange part protrudes from the outer peripheral surface of the main body part, and the flange part is located on the inner side of the first wall; at least part of the first insulating piece is located between the first wall and the flange part along the thickness direction of the first wall; at least part of the second insulating piece is located between the first wall and the flange part along the thickness direction of the first wall, the second insulating piece is in contact with the first insulating piece, and the melting point of the second insulating piece is higher than that of the first insulating piece. The technical scheme of the present application has high reliability.

Description

Technical Field

[0001] This application relates to the field of battery device technology, and more specifically, to a battery cell, a battery device, and an electrical device. Background Technology

[0002] Energy conservation and emission reduction are key to the sustainable development of the automotive industry, and electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of this sustainable development. For electric vehicles, battery technology is a crucial factor in their development.

[0003] In the manufacturing process of battery devices, the reliability of the battery device is a crucial issue. Therefore, improving the reliability of battery devices is a pressing technical problem that needs to be solved. Utility Model Content

[0004] This application provides a battery cell, a battery device, and an electrical device, which have high reliability.

[0005] This application is achieved through the following technical solution:

[0006] In a first aspect, embodiments of this application provide a battery cell, which includes a casing, electrode terminals, a first insulating member, and a second insulating member. The casing includes a first wall with an electrode lead-out hole. The electrode terminal is disposed on the first wall and includes a main body and a flange. The main body passes through the electrode lead-out hole, and the flange protrudes from the outer peripheral surface of the main body and is located inside the first wall. At least a portion of the first insulating member is located between the first wall and the flange along the thickness direction of the first wall. At least a portion of the second insulating member is located between the first wall and the flange along the thickness direction of the first wall, and the second insulating member is in contact with the first insulating member. The melting point of the second insulating member is higher than that of the first insulating member.

[0007] According to the embodiments of this application, the battery cell has a main body disposed within the electrode lead-out hole to facilitate the connection of the electrode terminals to the tabs and external conductive components, thereby facilitating the output and input of current. At least a portion of the first insulating member is located between the first wall and the flange portion to insulate and isolate the flange portion from the first wall. Furthermore, since the melting point of the second insulating member is higher than that of the first insulating member, by disposing the second insulating member between the first wall and the flange portion and having the second insulating member in contact with the first insulating member, even after the first insulating member melts due to high temperature, the second insulating member can still insulate and isolate the first wall and the flange portion, reducing the risk of a short circuit between the first wall and the flange portion, thereby improving the reliability of the battery cell.

[0008] According to some embodiments of this application, along the thickness direction of the first wall, the second insulating member is at least partially located between the first insulating member and the flange.

[0009] By disposing at least a portion of the second insulating member between the first insulating member and the flange portion, and having an overlapping area with the first insulating member along the thickness direction of the first wall, the second insulating member can effectively insulate and isolate the first wall and the flange portion after the first insulating member has melted.

[0010] According to some embodiments of this application, the second insulating member is connected to the flange portion.

[0011] By connecting the second insulating member to the flange, assembly is facilitated. Furthermore, during the assembly of the battery cell, the second insulating member can be assembled to the flange simultaneously with the first insulating member and the first wall, thereby improving assembly efficiency.

[0012] According to some embodiments of this application, the flange portion has a first surface, a second surface, and a first outer peripheral surface. Along the thickness direction of the first wall, the first surface faces the first wall and the second surface faces away from the first wall. The first outer peripheral surface connects the first surface and the second surface. The second insulating member includes a first part and a second part, the first part being disposed on the first surface and the second part being disposed on the first outer peripheral surface.

[0013] The first part is disposed on the first surface and the second part is disposed on the first outer peripheral surface, which can improve the insulation effect between the flange and the first wall, further reduce the risk of short circuit between the flange and the first wall, and improve the reliability of the battery cell.

[0014] According to some embodiments of this application, along the thickness direction of the first wall, the second insulating member is at least partially located between the first wall and the first insulating member.

[0015] By disposing at least a portion of the second insulating member between the first wall and the first insulating member, and having an overlapping area between the second insulating member and the first insulating member along the thickness direction of the first wall, the second insulating member can effectively insulate and isolate the first wall and the flange after the first insulating member has melted.

[0016] According to some embodiments of this application, the second insulating element is connected to the first wall.

[0017] The second insulating element is fixed to the first wall by connecting it to the first wall, thereby restricting the movement of the second insulating element relative to the first wall.

[0018] According to some embodiments of this application, a first groove is provided on the side of the first insulating member facing the first wall, and the second insulating member is at least partially accommodated in the first groove.

[0019] By at least partially accommodating the second insulating member within the first groove, the space occupied by the structure after assembling the first wall, the first insulating member, and the second insulating member in the thickness direction of the first wall can be reduced, thereby enabling the battery cell to have a higher energy density.

[0020] According to some embodiments of this application, the depth of the first groove along the thickness direction of the first wall is d, which satisfies 0.1mm≤d≤0.7mm.

[0021] If the depth of the first groove along the thickness direction of the first wall is too small, the size of the second insulating component accommodated in the first groove will be small, and the structure after the first wall, the first insulating component and the second insulating component are assembled will occupy a large space in the thickness direction of the first wall, affecting the energy density of the battery cell; if the depth of the first groove along the thickness direction of the first wall is too large, it will easily affect the overall strength of the first insulating component and affect the insulation effect of the first insulating component.

[0022] By setting the depth of the first groove along the thickness direction of the first wall to be greater than or equal to 0.1 mm, the size of the second insulating member protruding from the first groove can be smaller, so as to reduce the space occupied by the structure after the first wall, the first insulating member and the second insulating member are assembled in the thickness direction of the first wall, which is beneficial to improving the energy density of the battery cell; by setting the depth of the first groove along the thickness direction of the first wall to be less than or equal to 0.7 mm, the first insulating member has high overall strength and good insulation effect.

[0023] According to some embodiments of this application, 0.2mm ≤ d ≤ 0.6mm.

[0024] By setting the depth of the first groove along the thickness direction of the first wall to be greater than or equal to 0.2 mm, the size of the second insulating member protruding from the first groove can be smaller, so as to reduce the space occupied by the structure after the first wall, the first insulating member and the second insulating member are assembled in the thickness direction of the first wall, which is beneficial to improving the energy density of the battery cell; by setting the depth of the first groove along the thickness direction of the first wall to be less than or equal to 0.6 mm, the first insulating member has higher overall strength and better insulation effect.

[0025] According to some embodiments of this application, a second groove is provided on the inner surface of the first wall, an electrode lead-out hole penetrates the bottom wall of the second groove, at least a portion of the flange is accommodated in the second groove, and at least a portion of the second insulating member is provided on the bottom surface of the second groove.

[0026] By accommodating at least a portion of the flange in the second groove and disposing at least a portion of the second insulating member on the bottom surface of the second groove, the space occupied by the structure after the first wall, the first insulating member and the second insulating member are assembled can be reduced in the thickness direction of the first wall, which facilitates the improvement of the internal space utilization of the battery cell and enables the battery cell to have a higher energy density.

[0027] According to some embodiments of this application, the second insulating member includes a third part and a fourth part that are interconnected, the third part being disposed on the bottom surface of the second groove and the fourth part being disposed on the side surface of the second groove.

[0028] By setting the third part on the bottom surface of the second groove and the fourth part on the side surface of the second groove, after the first insulating member is accommodated, the second insulating member can form an insulating protection in a large area between the first wall and the flange, further improving the insulation effect, reducing the risk of short circuit between the first wall and the flange, and improving the reliability of the battery cell.

[0029] According to some embodiments of this application, the second insulating member further includes a fifth portion disposed on the inner surface of the first wall, and the fourth portion connects the third portion and the fifth portion.

[0030] By setting the fifth part on the inner surface of the first wall, a second insulating element with a larger area can be set on the inner side of the first wall, so that after the first insulating element melts, an insulating protection is formed on the inner side of the first wall, reducing the risk of short circuit between the first wall and the conductive parts inside the battery cell, and improving the reliability of the battery cell.

[0031] According to some embodiments of this application, the battery cell further includes an electrode assembly having tabs that are electrically connected to electrode terminals; on the same projection plane perpendicular to the thickness direction of the first wall, the orthographic projection of the tabs falls within the orthographic projection of the second insulating member.

[0032] The orthographic projection of the electrode falls within the orthographic projection of the second insulating component. When the first insulating component melts, the first wall and the electrode can be insulated and isolated by the second insulating component, reducing the risk of short circuit between the first wall and the electrode and improving the reliability of the battery cell.

[0033] According to some embodiments of this application, the second insulating member is provided with a first notch, and the first wall is provided with a liquid injection hole. When viewed along the thickness direction of the first wall, the liquid injection hole is located within the first notch.

[0034] By providing a first notch on the second insulating member, the injection hole can be avoided, so that the injection hole is not affected by the second insulating member after the second insulating member is assembled with the first wall, which facilitates the injection of electrolyte from the injection hole.

[0035] According to some embodiments of this application, the second insulating member is provided with a second notch, and the first insulating member has a first hot-melt column for connection with the first wall, wherein the first hot-melt column is located within the second notch when viewed along the thickness direction of the first wall.

[0036] By providing a second notch on the second insulating member, the first hot-melt column connecting the first insulating member and the first wall can be avoided, which helps to reduce the risk of interference between the second insulating member and the assembly of the first insulating member and the first wall.

[0037] According to some embodiments of this application, on the same projection plane perpendicular to the thickness direction of the first wall, the orthographic projection of the second insulating member does not overlap with the orthographic projection of the first insulating member.

[0038] The orthographic projection of the second insulating member does not overlap with the orthographic projection of the first insulating member, which can reduce the space occupied by the second insulating member in the thickness direction of the first wall. This results in a smaller space occupied by the structure after the first wall, the first insulating member, the second insulating member and the flange are assembled, which is conducive to improving the energy density of the battery cell.

[0039] According to some embodiments of this application, the melting point of the second insulating element is T, which satisfies 200℃≤T≤400℃.

[0040] If the melting point of the second insulating component is too low, it will easily melt when heated; if the melting point of the second insulating component is too high, the manufacturing cost will be high.

[0041] By selecting a melting point of the second insulating component that is greater than or equal to 200°C, the risk of the second insulating component melting due to heat can be reduced; by selecting a melting point of the second insulating component that is less than or equal to 400°C, the manufacturing cost can be reduced.

[0042] According to some embodiments of this application, 260℃≤T≤350℃.

[0043] By selecting a melting point of the second insulating component greater than or equal to 260°C, the risk of the second insulating component melting due to heat is further reduced; by selecting a melting point of the second insulating component less than or equal to 350°C, the manufacturing cost is further reduced.

[0044] According to some embodiments of this application, the thickness of the second insulating member is H along the thickness direction of the first wall, satisfying 0.02mm≤H≤0.60mm.

[0045] If the thickness of the second insulating component along the thickness direction of the first wall is too thin, the insulation effect of the second insulating component will be poor, which may easily lead to a short circuit between the first wall and the flange. If the thickness of the second insulating component along the thickness direction of the first wall is too thick, it will occupy a large assembly space in the thickness direction of the first wall, resulting in wasted space and affecting the energy density of the battery cell.

[0046] By setting the thickness of the second insulating member along the thickness direction of the first wall to be greater than or equal to 0.02 mm, the risk of short circuit between the first wall and the flange can be reduced, thus improving the reliability of the battery cell. By setting the thickness of the second insulating member along the thickness direction of the first wall to be less than or equal to 0.60 mm, the space occupied by the second insulating member in the thickness direction of the first wall can be reduced, which is beneficial to improving the energy density of the battery cell.

[0047] According to some embodiments of this application, 0.1mm ≤ H ≤ 0.5mm.

[0048] By setting the thickness of the second insulating member along the thickness direction of the first wall to be greater than or equal to 0.1 mm, the risk of short circuit between the first wall and the flange is further reduced, and the reliability of the battery cell is improved. By setting the thickness of the second insulating member along the thickness direction of the first wall to be less than or equal to 0.5 mm, the space occupied by the second insulating member in the thickness direction of the first wall is further reduced, which is beneficial to improving the energy density of the battery cell.

[0049] According to some embodiments of this application, the second insulating element is insulating adhesive paper.

[0050] Insulating tape facilitates assembly and reduces assembly difficulty.

[0051] According to some embodiments of this application, the battery cell further includes a seal located between the first wall and the electrode terminal for sealing the gap between the first wall and the electrode terminal; on the same projection plane perpendicular to the thickness direction of the first wall, the orthographic projection of the second insulating member does not overlap with the orthographic projection of the seal.

[0052] By providing a seal between the first wall and the electrode terminal, the gap between the first wall and the electrode terminal can be sealed; by setting the orthographic projection of the second insulating element to not overlap with the orthographic projection of the seal, the sealing effect of the second insulating element on the first wall and the electrode terminal can be reduced, so that the first wall and the electrode terminal have a better sealing effect.

[0053] Secondly, embodiments of this application also provide a battery device, which includes a battery cell provided according to any of the above embodiments.

[0054] Thirdly, embodiments of this application also provide an electrical device, which includes a battery cell provided according to any of the above embodiments, the battery cell being used to provide electrical energy; or, the electrical device includes a battery device provided according to the above embodiments, the battery device being used to provide electrical energy.

[0055] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0056] 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.

[0057] Figure 1 This application provides structural schematic diagrams of vehicles for some embodiments;

[0058] Figure 2 This is an exploded view of the structure of a battery device provided in some embodiments of this application;

[0059] Figure 3 This is an exploded view of the structure of a battery cell provided in some embodiments of this application;

[0060] Figure 4 A schematic diagram of the assembly of the first wall and the electrode terminals provided for some embodiments of this application;

[0061] Figure 5 for Figure 4 Enlarged view of a portion at point A;

[0062] Figure 6 A schematic diagram showing the second insulating member located between the first insulating member and the flange portion, provided for some embodiments of this application;

[0063] Figure 7 for Figure 6 A magnified view of section B;

[0064] Figure 8 A schematic diagram showing a second groove provided in the first wall according to some embodiments of this application;

[0065] Figure 9 A schematic diagram showing the second insulating member located between the first wall and the first insulating member according to some embodiments of this application;

[0066] Figure 10 for Figure 9 A magnified view of a portion at point C;

[0067] Figure 11 A schematic diagram showing the second insulating element located within a second groove, provided in some embodiments of this application;

[0068] Figure 12 for Figure 11 A magnified view of a portion at point D;

[0069] Figure 13 This is a schematic diagram of the assembly of the tabs and electrode terminals provided in some embodiments of this application;

[0070] Figure 14 This is a schematic diagram illustrating the assembly of the second insulating member with the first wall according to some embodiments of this application;

[0071] Figure 15 This is a schematic diagram of the structure of the first insulating element provided in some embodiments of this application;

[0072] Figure 16 This is a schematic diagram of a first insulating member and a second insulating member provided for some embodiments of this application.

[0073] Icons: 100 - Battery assembly; 10 - Housing; 11 - First sub-housing; 12 - Second sub-housing; 20 - Battery cell; 21 - Housing; 21a - Shell; 21b - End cap; 211 - First wall; 211a - Electrode lead-out hole; 211b - Second groove; 211c - Liquid injection hole; 211d - First heat-fused groove; 211e - Second heat-fused groove; 22 - Electrode terminal; 221 - Main body; 222 - Flange; 222a - First surface; 222b - Second surface; 222c - First outer peripheral surface; 2 23-Conductive component; 23-First insulating component; 23a-First groove; 23b-First hot melt pillar; 23c-Second hot melt pillar; 24-Second insulating component; 24a-First notch; 24b-Second notch; 241-First part; 242-Second part; 243-Third part; 244-Fourth part; 245-Fifth part; 25-Electrode assembly; 25a-Electrode tab; 26-Third insulating component; 27-Sealing component; 200-Controller; 300-Motor; 1000-Vehicle; Z-Thickness direction of the first wall. Detailed Implementation

[0074] The embodiments of this application will be described in further detail below with reference to the accompanying drawings and examples. The detailed description of the following embodiments and the accompanying drawings are used to illustrate the principles of this application by way of example, but should not be used to limit the scope of this application, that is, this application is not limited to the described embodiments.

[0075] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having" and any variations thereof in the description, claims and foregoing drawings of this application are intended to cover non-exclusive inclusion.

[0076] The terms "first," "second," etc., in the specification, claims, or the accompanying drawings of this application are used to distinguish different objects, rather than to describe a specific order or primary / secondary relationship.

[0077] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0078] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication 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.

[0079] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0080] In this application, "multiple" refers to two or more (including two), and similarly, "multiple groups" refers to two or more (including two), and "multiple pieces" refers to two or more (including two).

[0081] The battery device mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells, which are connected in series, parallel, or mixed connections via a busbar.

[0082] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells; as an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells into a single module. As an example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0083] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cell assemblies housed within the housing.

[0084] As an example, the battery cell assembly can be a battery module, and the battery cell assembly can be housed in the housing by fixing the battery module in the housing.

[0085] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0086] As an example, the enclosure may include a first sub-enclosure and a second sub-enclosure. The first and second sub-enclosures are interlocked to form a closed space inside the enclosure to house the individual battery cells. Here, "closed" refers to covering or shutting down; it can be sealed or not sealed. The first sub-enclosure may be a top cover or a bottom plate.

[0087] As an example, the enclosure may include a top cover, a frame, and a bottom plate. The top cover and bottom plate are connected to the frame, creating an enclosed space inside the enclosure to house the individual battery cells.

[0088] As an example, the housing can be part of the vehicle's chassis structure. For instance, the housing's roof can be at least part of the vehicle's floor, or the housing's frame can be at least part of the vehicle's crossbeams and longitudinal beams.

[0089] In some embodiments, the battery device refers to an energy storage device, which includes a housing with a door on at least one side. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0090] In this embodiment of the application, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0091] The battery cell may be, but is not limited to, lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc.

[0092] A single battery cell typically includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charging and discharging process of a single battery cell, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, prevents short circuits while allowing active ions to pass through.

[0093] In some embodiments, the positive electrode may be a positive electrode sheet, which may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0094] As an example, the positive current collector has two surfaces opposite each other in its own thickness direction, and the positive active material is disposed on either or both of the two opposite surfaces of the positive current collector.

[0095] As an example, the positive electrode current collector can be a metal foil or a composite current collector. For example, as a metal foil, it can be made of stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel, or titanium with a silver-plated surface. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0096] As an example, the positive electrode active material may include at least one of the following materials: lithium phosphate, lithium transition metal oxide, and their respective modified compounds. However, this application is not limited to these materials, and other conventional materials that can be used as positive electrode active materials for batteries may also be used.

[0097] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0098] As an example, the negative electrode current collector can be a metal foil or a composite current collector. For example, as a metal foil, it can be aluminum with a silver-plated surface, stainless steel with a silver-plated surface, stainless steel, copper, aluminum, nickel, carbon electrode, or made of carbon, nickel, or titanium, etc.

[0099] In some embodiments, the negative electrode current collector has two surfaces opposite each other in its own thickness direction, and the negative electrode active material is disposed on either or both of the two opposite surfaces of the negative electrode current collector.

[0100] As an example, the negative electrode active material may be a negative electrode active material known in the art for use in batteries. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, and lithium titanate, etc. Silicon-based materials may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. Tin-based materials may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, this application is not limited to these materials, and other conventional materials that can be used as negative electrode active materials for batteries may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0101] In some embodiments, the separator is a separator membrane. This application does not impose any particular limitation on the type of separator membrane; any known porous separator membrane with good chemical and mechanical stability can be selected.

[0102] As an example, the main material of the separator can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramic. The separator can be a single-layer film or a multi-layer composite film, without particular limitation. When the separator is a multi-layer composite film, the materials of each layer can be the same or different, without particular limitation. The separator can be a separate component located between the positive and negative electrodes, or it can be attached to the surfaces of the positive and negative electrodes.

[0103] In some embodiments, the separator is a solid electrolyte. The solid electrolyte is disposed between the positive and negative electrodes, serving both to transport ions and to isolate the positive and negative electrodes.

[0104] In some implementations, the electrode assembly is a wound structure. The positive and negative electrode sheets are wound into a wound structure.

[0105] In some implementations, the electrode assembly is a stacked structure.

[0106] In some embodiments, the battery cell may include a housing. The housing is used to encapsulate components such as electrode assemblies and electrolytes. The housing may be made of steel, aluminum, plastic (such as polypropylene), composite metal (such as copper-aluminum composite), or aluminum-plastic film, etc.

[0107] In some embodiments, the housing includes an end cap and a casing, the casing having an opening, and the end cap closing the opening to form a sealed space for accommodating substances such as electrode assemblies and electrolytes. The casing may have one or more openings. The end cap may also be provided one or more times.

[0108] In some embodiments, at least one electrode terminal is provided on the housing, and the electrode terminal is electrically connected to the tab of the electrode assembly. The electrode terminal can be directly connected to the tab or indirectly connected to the tab via an adapter. The electrode terminal can be located on the end cap or on the housing.

[0109] In some implementations, an explosion-proof valve is provided on the housing. The explosion-proof valve is used to release the internal pressure of the battery cells.

[0110] In some embodiments, the housing can be a sealed structure or a non-sealed structure. As an example, when the housing is a sealed structure, it protects the electrode assembly and prevents leaks such as electrolyte leakage. When the housing is a non-sealed structure, it protects the electrode assembly, and a sealing bag may be included between the housing and the electrode assembly to encapsulate the electrode assembly and electrolyte. Specifically, the sealing bag can be a bag-shaped insulating material or an aluminum-plastic film.

[0111] As an example, a battery cell can be a cylindrical battery cell, a prismatic battery cell, or a battery cell of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic batteries, such as hexagonal prismatic batteries.

[0112] The development of battery device technology must take into account multiple design factors, such as performance parameters like energy density, discharge capacity, and charge / discharge rate. In addition, the reliability of the battery device also needs to be considered.

[0113] Typically, a battery cell includes a casing, electrode terminals, a first insulating member, and an electrode assembly. The electrode terminals are disposed on the first wall of the casing, and the electrode assembly is disposed inside the casing. The tabs of the electrode assembly are electrically connected to the electrode terminals to output or input current. The electrode terminals include a body portion and a flange portion. At least a portion of the body portion is disposed within an electrode lead-out hole in the first wall, and the flange portion protrudes from the outer peripheral surface of the body portion and is located inside the first wall. The first insulating member is disposed inside the first wall, and at least a portion of the first insulating member is located between the first wall and the flange portion to insulate and isolate the first wall from the flange portion. Typically, when the internal temperature of the battery cell rises sharply, the first insulating member easily melts, exposing the first wall and potentially causing contact between the first wall and the flange portion of the electrode terminal, resulting in a short circuit between the positive and negative electrodes and lowering the reliability of the battery cell.

[0114] In view of this, in order to solve the problem that the insulation between the first wall and the electrode terminal fails due to the melting of the first insulating component at high temperature, resulting in low reliability of the battery cell, this application provides a battery cell including a shell, electrode terminals, a first insulating component, and a second insulating component. The shell includes a first wall with an electrode lead-out hole; the electrode terminal is disposed on the first wall and includes a main body and a flange, the main body passing through the electrode lead-out hole, the flange protruding from the outer peripheral surface of the main body and located inside the first wall; at least a portion of the first insulating component is located between the first wall and the flange along the thickness direction of the first wall; at least a portion of the second insulating component is located between the first wall and the flange along the thickness direction of the first wall, the second insulating component is in contact with the first insulating component, and the melting point of the second insulating component is higher than that of the first insulating component.

[0115] In such a battery cell, the main body is disposed within the electrode lead-out hole to facilitate the connection of the electrode terminals to the tabs and external conductive components, thereby enabling current output and input. By placing at least a portion of the first insulating member between the first wall and the flange, the flange is insulated from the first wall. Furthermore, since the melting point of the second insulating member is higher than that of the first insulating member, by disposing the second insulating member between the first wall and the flange and having the second insulating member in contact with the first insulating member, even after the first insulating member melts due to high temperature, the second insulating member can still insulate and isolate the first wall and the flange, reducing the risk of short circuit between the first wall and the flange, thereby improving the reliability of the battery cell.

[0116] The battery cells and battery devices disclosed in this application can be used, but are not limited to, in electrical devices such as vehicles, ships, or aircraft. A power system for such an electrical device can be constructed using the battery cells and battery devices disclosed in this application.

[0117] Electrical devices can include mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles, ships, and spacecraft, such as airplanes, rockets, space shuttles, and spacecraft.

[0118] For ease of explanation, the following embodiments will be described using a vehicle as an example of an electrical device according to an embodiment of this application.

[0119] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a vehicle provided in some embodiments of this application. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device 100 is installed inside the vehicle 1000, and the battery device 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000; for example, the battery device 100 can serve as the operating power source for the vehicle 1000's electrical system, such as meeting the power requirements for starting, navigation, and operation of the vehicle 1000.

[0120] The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, for the power needs of the vehicle 1000 during startup, navigation and driving.

[0121] In some embodiments of this application, the battery device 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0122] Please refer to Figure 2 , Figure 2 This is an exploded view of the structure of a battery device provided in some embodiments of this application. The battery device 100 includes a housing 10 and a battery cell 20, with the battery cell 20 housed within the housing 10. The housing 10 provides a space for the battery cell 20 and can have various structures. In some embodiments, the housing 10 may include a first sub-housing 11 and a second sub-housing 12, which overlap each other, jointly defining a space for accommodating the battery cell 20. The second sub-housing 12 may be a hollow structure with one open end, while the first sub-housing 11 may be a plate-like structure, covering the open side of the second sub-housing 12 so that the first sub-housing 11 and the second sub-housing 12 jointly define the space. Alternatively, both the first sub-housing 11 and the second sub-housing 12 may be hollow structures with one open side, with the open side of the first sub-housing 11 covering the open side of the second sub-housing 12.

[0123] In the battery device 100, there can be multiple battery cells 20, which can be connected in series, parallel, or in a mixed configuration. A mixed configuration means that multiple battery cells 20 are connected in both series and parallel connections. Multiple battery cells 20 can be directly connected in series, parallel, or in a mixed configuration, and then the entire assembly of the multiple battery cells 20 is housed within the housing 10. Alternatively, the battery device 100 can also consist of multiple battery cells 20 first connected in series, parallel, or in a mixed configuration to form battery modules, and then these battery modules are connected in series, parallel, or in a mixed configuration to form a whole, which is also housed within the housing 10. The battery device 100 may also include other structures; for example, it may include a busbar component for electrical connection between the multiple battery cells 20.

[0124] Please refer to Figures 3 to 5 , Figure 3 This is an exploded view of the structure of a battery cell provided in some embodiments of this application. Figure 4 This is a schematic diagram illustrating the assembly of the first wall and the electrode terminals according to some embodiments of this application. Figure 5 for Figure 4 A magnified view of a portion at point A. (See image below.) Figure 3As shown, this application embodiment provides a battery cell 20, which includes a housing 21, electrode terminals 22, a first insulating member 23, and a second insulating member 24. The housing 21 includes a first wall 211, and the first wall 211 is provided with an electrode lead-out hole 211a; the electrode terminal 22 is disposed on the first wall 211, and the electrode terminal 22 includes a main body portion 221 and a flange portion 222. The main body portion 221 passes through the electrode lead-out hole 211a, and the flange portion 222 protrudes from the outer peripheral surface of the main body portion 221 and is located inside the first wall 211; along the thickness direction Z of the first wall, at least a portion of the first insulating member 23 is located between the first wall 211 and the flange portion 222; along the thickness direction Z of the first wall, at least a portion of the second insulating member 24 is located between the first wall 211 and the flange portion 222, and the second insulating member 24 is in contact with the first insulating member 23. The melting point of the second insulating member 24 is higher than the melting point of the first insulating member 23.

[0125] The housing 21 includes a housing 21a and an end cap 21b. The housing 21a has an opening, and the end cap 21b closes the opening to isolate the internal environment of the battery cell 20 from the external environment. The battery cell 20 also includes an electrode assembly 25, which is housed within the housing 21a. The tabs 25a of the electrode assembly 25 are electrically connected to the electrode terminals 22.

[0126] The housing 21a is a component used to cooperate with the end cap 21b to form the internal environment of the battery cell 20, wherein the formed internal environment can accommodate the electrode assembly 25, electrolyte, and other components. The housing 21a and the end cap 21b can be independent components. The housing 21a can have various shapes and sizes. Specifically, the shape of the housing 21a can be determined according to the specific shape and size of the electrode assembly 25. The housing 21a can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, and plastic.

[0127] End cap 21b refers to a component that covers the opening of housing 21a to isolate the internal environment of battery cell 20 from the external environment. The shape of end cap 21b can be adapted to the shape of housing 21a to fit it. Optionally, end cap 21b can be made of a material with certain hardness and strength (such as aluminum alloy), so that end cap 21b is not easily deformed under pressure and impact, giving battery cell 20 higher structural strength and improved reliability. Functional components such as electrode terminals 22 can be provided on end cap 21b. Electrode terminals 22 can be used for electrical connection with electrode assembly 25 to output or input electrical energy to battery cell 20. The material of end cap 21b can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, etc., and this embodiment does not impose any special limitations on this.

[0128] In some embodiments, the first wall 211 may be a wall portion of the housing 21a, or the first wall 211 may also be an end cap 21b. Optionally, as shown in the figure, the first wall 211 is an end cap 21b to facilitate the assembly of the electrode terminal 22 with the first wall 211.

[0129] The electrode lead-out hole 211a is a through hole that penetrates the first wall 211 along the thickness direction Z of the first wall to facilitate the passage of the power supply terminal 22. In some embodiments, there may be two electrode lead-out holes 211a, which are spaced apart; there may also be two electrode terminals 22, which are a positive terminal and a negative terminal, respectively. The positive terminal is corresponding to one electrode lead-out hole 211a, and the negative terminal is corresponding to the other electrode terminal 22. In this application, without specifying polarity, for ease of description, the electrode terminal 22 may be either a positive terminal or a negative terminal; the structures of the positive and negative terminals may be the same or approximately the same.

[0130] In some embodiments, the main body 221 may be cylindrical, or it may be prismatic.

[0131] The flange portion 222 protrudes from the outer peripheral surface of the main body portion 221. The flange portion 222 can be integrally formed with the main body portion 221, or the flange portion 222 can be separately provided with the main body portion 221 and connected as one piece.

[0132] The flange portion 222 is located inside the first wall 211. On the same projection plane perpendicular to the thickness direction Z of the first wall, the orthographic projection of the flange portion 222 overlaps with the orthographic projection of the first wall 211. The flange portion 222 and the main body portion 221 cooperate to block the electrode lead-out hole 211a so that the electrode terminal 22 can be electrically connected to the tab 25a of the electrode assembly 25.

[0133] In some embodiments, the flange portion 222 may be disposed around the outer peripheral surface of the main body portion 221 so that there is a large connection area between the electrode terminal 22 and the tab 25a of the electrode assembly 25.

[0134] A portion of the electrode terminal 22 is located on the outside of the first wall 211 to facilitate electrical connection with conductive components outside the battery cell 20.

[0135] For example, in some embodiments, the electrode terminal 22 further includes a conductive element 223 located outside the first wall 211. The conductive element 223 is riveted to the electrode terminal 22 along the thickness direction Z of the first wall. The first wall 211 is located between the flange portion 222 and the conductive element 223. The conductive element 223 is used for electrical connection with an external conductive component (such as a busbar component).

[0136] In some embodiments, the battery cell 20 further includes a third insulating member 26, which is disposed between the conductive member 223 and the first wall 211 to insulate and isolate the first wall 211 from the conductive member 223.

[0137] Along the thickness direction Z of the first wall, a portion of the first insulating member 23 may be located between the first wall 211 and the flange portion 222, or the entire first insulating member 23 may be located between the first wall 211 and the flange portion 222, so that the first insulating member 23 can isolate the first wall 211 and the flange portion 222.

[0138] Along the thickness direction Z of the first wall, a portion of the second insulating member 24 may be located between the first wall 211 and the flange portion 222, or the entire second insulating member 24 may be located between the first wall 211 and the flange portion 222, so that the second insulating member 24 isolates the first wall 211 and the flange portion 222.

[0139] The second insulating member 24 can contact the first insulating member 23 in the following ways: the second insulating member 24 and the first insulating member 23 are distributed in a plane perpendicular to the thickness direction Z of the first wall, and the second insulating member 24 is in contact with the first insulating member 23; or, the second insulating member 24 and the first insulating member 23 are stacked on top of each other in the thickness direction Z of the first wall, and the second insulating member 24 is in contact with the first insulating member 23. For example, on the same projection plane perpendicular to the thickness direction Z of the first wall, the orthographic projection of the second insulating member 24 may not overlap with the orthographic projection of the first insulating member 23, or the orthographic projection of the second insulating member 24 may at least partially overlap with the orthographic projection of the first insulating member 23.

[0140] The melting point of the second insulating member 24 is higher than that of the first insulating member 23, meaning that when the internal temperature of the battery cell 20 rises, the first insulating member 23 melts before the second insulating member 24. After the first insulating member 23 melts, the second insulating member 24 can still insulate and isolate the first wall 211 from the flange portion 222.

[0141] The material of the first insulating element 23 can be plastic or rubber, for example, the material of the first insulating element 23 can include polypropylene.

[0142] The material of the second insulating member 24 can be plastic or rubber, for example, the material of the second insulating member 24 can include polyimide.

[0143] The material of the first wall 211 can be metal, such as steel, aluminum alloy, etc.

[0144] The electrode terminal 22 can be made of metal, such as aluminum or copper.

[0145] According to the embodiments of this application, the battery cell 20 has a main body 221 disposed in the electrode lead-out hole 211a so that the electrode terminal 22 can be connected to the tab 25a and the external conductive member 223, which facilitates the output and input of current. By placing at least a portion of the first insulating member 23 between the first wall 211 and the flange portion 222, the flange portion 222 is insulated from the first wall 211. Furthermore, since the melting point of the second insulating member 24 is higher than that of the first insulating member 23, by disposing the second insulating member 24 between the first wall 211 and the flange portion 222 and contacting the first insulating member 23, even after the first insulating member 23 melts due to high temperature, the second insulating member 24 can still insulate and isolate the first wall 211 and the flange portion 222, reducing the risk of short circuit between the first wall 211 and the flange portion 222, thereby improving the reliability of the battery cell 20.

[0146] Please refer to Figure 6 and Figure 7 , Figure 6 This is a schematic diagram showing the second insulating member located between the first insulating member and the flange portion, according to some embodiments of this application. Figure 7 for Figure 6 A partial enlarged view at point B. According to some embodiments of this application, along the thickness direction Z of the first wall, the second insulating member 24 is at least partially located between the first insulating member 23 and the flange portion 222.

[0147] Along the thickness direction Z of the first wall, a portion of the second insulating member 24 may be located between the first insulating member 23 and the flange portion 222, or the entire second insulating member 24 may be located between the first insulating member 23 and the flange portion 222.

[0148] During the assembly of the battery cell 20, the second insulating member 24 can be connected to the first insulating member 23 and / or the flange portion 222.

[0149] By disposing at least a portion of the second insulating member 24 between the first insulating member 23 and the flange portion 222, and having an overlapping area with the first insulating member 23 along the thickness direction Z of the first wall, the second insulating member 24 can effectively insulate and isolate the first wall 211 and the flange portion 222 after the first insulating member 23 has melted.

[0150] Please refer to Figure 7 According to some embodiments of this application, the second insulating member 24 is connected to the flange portion 222.

[0151] For example, the second insulating member 24 may be bonded to the flange portion 222, or a portion of the second insulating member 24 may be embedded in the flange portion 222 and snap-fitted to the flange portion 222.

[0152] By connecting the second insulating member 24 to the flange portion 222, assembly is facilitated. In addition, during the assembly of the battery cell 20, the second insulating member 24 can be assembled to the flange portion 222 simultaneously with the first insulating member 23 being assembled to the first wall 211, which can improve assembly efficiency.

[0153] Please refer to Figure 6 and Figure 7 According to some embodiments of this application, the flange portion 222 has a first surface 222a, a second surface 222b, and a first outer peripheral surface 222c. Along the thickness direction Z of the first wall, the first surface 222a faces the first wall 211, the second surface 222b faces away from the first wall 211, and the first outer peripheral surface 222c connects the first surface 222a and the second surface 222b. The second insulating member 24 includes a first portion 241 and a second portion 242. The first portion 241 is disposed on the first surface 222a, and the second portion 242 is disposed on the first outer peripheral surface 222c.

[0154] The first surface 222a and the second surface 222b are two surfaces of the flange portion 222 that are disposed opposite to each other in the thickness direction Z of the first wall. The first outer peripheral surface 222c is disposed around the first surface 222a and the second surface 222b and connects the first surface 222a and the second surface 222b.

[0155] In some embodiments, the first part 241 may be separately disposed from the second part 242, or the first part 241 may be connected to the second part 242, or the first part 241 may not be connected to the second part 242. Optionally, the first surface 222a and the first outer peripheral surface 222c are connected through a first arc surface, and the first part 241 and the second part 242 are connected on the first arc surface.

[0156] In some embodiments, the first part 241 may also be integrally formed with the second part 242, for example, the first part 241 and the second part 242 may be integrally injection molded.

[0157] In some embodiments, the first portion 241 may be bonded to the first surface 222a, and the second portion 242 may be bonded to the first outer peripheral surface 222c; or, the second insulating member 24 may be injection molded onto the flange portion 222, and the first portion 241 and the second portion 242 may be connected.

[0158] In the above embodiment, the first part 241 is disposed on the first surface 222a and the second part 242 is disposed on the first outer peripheral surface 222c, which can improve the insulation effect between the flange 222 and the first wall 211, further reduce the risk of short circuit between the flange 222 and the first wall 211, and improve the reliability of the battery cell 20.

[0159] Please refer to Figure 8 , Figure 8 This is a schematic diagram of a first wall with a second groove provided in some embodiments of this application. To reduce the space occupied by the assembled structure of the first wall 211, the first insulating member 23, the second insulating member 24, and the flange 222 in the thickness direction Z of the first wall, according to some embodiments of this application, a second groove 211b is provided on the inner surface of the first wall 211. The depth direction of the second groove 211b is parallel to the thickness direction Z of the first wall. The second groove 211b is formed by recessing from the inner side of the first wall 211 towards the outer side of the first wall 211. An electrode lead-out hole 211a penetrates the bottom wall of the second groove 211b. At least a portion of the flange 222 is accommodated in the second groove 211b, at least a portion of the second insulating member 24 is accommodated in the second groove 211b, a first portion 241 is disposed on the first surface 222a, and a second portion 242 is disposed on the first outer peripheral surface 222c. In this embodiment, since the first part 241 is disposed on the first surface 222a and the second part 242 is disposed on the first outer peripheral surface 222c, when the first insulating member 23 is melted, the first part 241 and the second part 242 can still insulate and isolate the flange 222 from the first wall 211.

[0160] In some embodiments, the second portion 242 protrudes from the inner surface of the first wall 211 in a direction pointing from the outer side to the inner side of the first wall 211. In a direction perpendicular to the thickness direction Z of the first wall, the second portion 242 has a large overlap area with the groove side of the second groove 211b, which further reduces the risk of short circuit between the flange portion 222 and the first wall 211 and improves the reliability of the battery cell 20.

[0161] Please refer to Figure 9 and Figure 10 , Figure 9 This is a schematic diagram showing the second insulating member located between the first wall and the first insulating member, provided in some embodiments of this application. Figure 10 for Figure 9 A partial enlarged view at point C. According to some embodiments of this application, along the thickness direction Z of the first wall, the second insulating member 24 is at least partially located between the first wall 211 and the first insulating member 23.

[0162] Along the thickness direction Z of the first wall, a portion of the second insulating member 24 is located between the first wall 211 and the first insulating member 23, or the entire second insulating member 24 is located between the first wall 211 and the first insulating member 23.

[0163] By disposing at least a portion of the second insulating member 24 between the first wall 211 and the first insulating member 23, and having an overlapping area along the thickness direction Z of the first wall, the second insulating member 24 and the first insulating member 23 can effectively insulate and isolate the first wall 211 and the flange portion 222 after the first insulating member 23 has melted.

[0164] Please refer to Figure 9 and Figure 10 According to some embodiments of this application, the second insulating member 24 is connected to the first wall 211.

[0165] The second insulating member 24 can be bonded to the first wall 211, or the second insulating member 24 can be injection molded onto the first wall 211.

[0166] The second insulating member 24 is connected to the first wall 211 to fix the second insulating member 24 and restrict the movement of the second insulating member 24 relative to the first wall 211.

[0167] Please refer to Figure 9 and Figure 10 According to some embodiments of this application, a first groove 23a is provided on the side of the first insulating member 23 facing the first wall 211, and the second insulating member 24 is at least partially accommodated in the first groove 23a.

[0168] The depth direction of the first groove 23a can be parallel to the thickness direction Z of the first wall. The first groove 23a is formed by the recess of the side of the first insulating member 23 facing the first wall 211 toward the side away from the first wall 211.

[0169] In some embodiments, a portion of the second insulating member 24 is accommodated within the first groove 23a, or the entire second insulating member 24 is accommodated within the first groove 23a.

[0170] In some embodiments, the second insulating member 24 may contact the bottom surface of the first groove 23a, or the second insulating member 24 may be spaced apart from the bottom surface of the first groove 23a, and the second insulating member 24 may contact the side surface of the first groove 23a.

[0171] By at least partially accommodating the second insulating member 24 within the first groove 23a, the space occupied by the structure after assembling the first wall 211, the first insulating member 23, and the second insulating member 24 in the thickness direction Z of the first wall can be reduced, thereby enabling the battery cell 20 to have a higher energy density.

[0172] According to some embodiments of this application, the depth of the first groove 23a along the thickness direction Z of the first wall is d, which satisfies 0.1mm≤d≤0.7mm.

[0173] If the depth of the first groove 23a along the thickness direction Z of the first wall is too small, the size of the second insulating member 24 accommodated in the first groove 23a will be small, and the structure after the first wall 211, the first insulating member 23 and the second insulating member 24 are assembled will occupy a large space in the thickness direction Z of the first wall, affecting the energy density of the battery cell 20; if the depth of the first groove 23a along the thickness direction Z of the first wall is too large, it will easily affect the overall strength of the first insulating member 23 and affect the insulation effect of the first insulating member 23.

[0174] By setting the depth of the first groove 23a along the thickness direction Z of the first wall to be greater than or equal to 0.1 mm, the size of the second insulating member 24 protruding from the first groove 23a can be smaller, so as to reduce the space occupied by the structure after the first wall 211, the first insulating member 23 and the second insulating member 24 are assembled in the thickness direction Z of the first wall, which is beneficial to improving the energy density of the battery cell 20; by setting the depth of the first groove 23a along the thickness direction Z of the first wall to be less than or equal to 0.7 mm, the first insulating member 23 has high overall strength and good insulation effect.

[0175] In some embodiments, the depth of the first groove 23a along the thickness direction Z of the first wall can be, but is not limited to, any one or any two of 0.10mm, 0.15mm, 0.20mm, 0.25mm, 0.30mm, 0.35mm, 0.40mm, 0.45mm, 0.50mm, 0.55mm, 0.60mm, 0.65mm, or 0.70mm.

[0176] According to some embodiments of this application, 0.2mm ≤ d ≤ 0.6mm.

[0177] By setting the depth of the first groove 23a along the thickness direction Z of the first wall to be greater than or equal to 0.2 mm, the size of the second insulating member 24 protruding from the first groove 23a can be smaller, so as to reduce the space occupied by the structure after the first wall 211, the first insulating member 23 and the second insulating member 24 are assembled in the thickness direction Z of the first wall, which is beneficial to improving the energy density of the battery cell 20. By setting the depth of the first groove 23a along the thickness direction Z of the first wall to be less than or equal to 0.6 mm, the first insulating member 23 has higher overall strength and better insulation effect.

[0178] Please refer to Figure 11 , Figure 11 This is a schematic diagram showing the second insulating member located within the second groove, as provided in some embodiments of this application. Figure 12 for Figure 11A partial enlarged view at point D. According to some embodiments of this application, a second groove 211b is provided on the inner surface of the first wall 211, an electrode lead-out hole 211a penetrates the bottom wall of the second groove 211b, at least a portion of the flange portion 222 is accommodated in the second groove 211b; at least a portion of the second insulating member 24 is provided on the bottom surface of the second groove 211b.

[0179] The second groove 211b is a groove formed by recessing from the inner side of the first wall 211 toward the outer side of the first wall 211, so that at least a portion of the flange portion 222 can be accommodated in the second groove 211b.

[0180] In some embodiments, a portion of the flange 222 may be accommodated within the second groove 211b, or the entire flange 222 may be accommodated within the second groove 211b.

[0181] In some embodiments, a portion of the second insulating member 24 may be accommodated within the second groove 211b, or all of the second insulating member 24 may be accommodated within the second groove 211b.

[0182] By accommodating at least a portion of the flange 222 within the second groove 211b and at least a portion of the second insulating member 24 disposed on the bottom surface of the second groove 211b, the space occupied by the structure after the first wall 211, the first insulating member 23, and the second insulating member 24 are assembled in the thickness direction Z of the first wall can be reduced, which facilitates the improvement of the internal space utilization of the battery cell 20 and enables the battery cell 20 to have a higher energy density.

[0183] Please refer to Figure 12 According to some embodiments of this application, the second insulating member 24 includes a third part 243 and a fourth part 244 that are connected to each other. The third part 243 is disposed on the bottom surface of the second groove 211b, and the fourth part 244 is disposed on the side surface of the second groove 211b.

[0184] In some embodiments, the third part 243 can be attached to the bottom surface of the second groove 211b, and the fourth part 244 can be attached to the side surface of the second groove 211b. The third part 243 corresponds to the first surface 222a of the flange 222, and the fourth part 244 corresponds to the first outer peripheral surface 222c of the flange 222.

[0185] In some embodiments, the fourth part 244 may be connected to the third part 243, for example, the fourth part 244 may be bonded to the third part 243, or the fourth part 244 may be integrally formed with the third part 243.

[0186] By setting the third part 243 on the bottom surface of the second groove 211b and the fourth part 244 on the side surface of the second groove 211b, after the first insulating member 23 is accommodated, the second insulating member 24 can form an insulating protection in a large area between the first wall 211 and the flange 222, further improving the insulation effect, reducing the risk of short circuit between the first wall 211 and the flange 222, and improving the reliability of the battery cell 20.

[0187] Please refer to Figure 12 According to some embodiments of this application, the second insulating member 24 further includes a fifth portion 245 disposed on the inner surface of the first wall 211, and a fourth portion 244 connecting the third portion 243 and the fifth portion 245.

[0188] The fifth part 245 can be attached to the inner surface of the first wall 211, and the fifth part 245 can be set around the second groove 211b.

[0189] The third part 243, the fourth part 244 and the fifth part 245 can be set separately and connected as one piece; or, the third part 243, the fourth part 244 and the fifth part 245 can be formed as one piece.

[0190] The fourth part 244 connects the third part 243 and the fifth part 245, which facilitates the assembly of the second insulating member 24 with the first wall 211 and reduces the risk of the second insulating member 24 falling off.

[0191] By setting the fifth part 245 on the inner surface of the first wall 211, a second insulating member 24 with a larger area can be set on the inner side of the first wall 211, so that after the first insulating member 23 melts, an insulating protection is formed on the inner side of the first wall 211, reducing the risk of short circuit between the first wall 211 and the conductive parts inside the battery cell 20, and improving the reliability of the battery cell 20.

[0192] Please refer to Figure 3 and further refer to Figure 13 and Figure 14 , Figure 13 This is a schematic diagram illustrating the assembly of the tabs and electrode terminals provided in some embodiments of this application. Figure 14 This is a schematic diagram of the assembly of the second insulating member and the first wall provided in some embodiments of this application, wherein, Figure 13 The first insulating member is not shown. According to some embodiments of this application, the battery cell 20 further includes an electrode assembly 25, which has a tab 25a that is electrically connected to an electrode terminal 22; on the same projection plane perpendicular to the thickness direction Z of the first wall, the orthographic projection of the tab 25a falls within the orthographic projection of the second insulating member 24.

[0193] Electrode assembly 25 is housed within casing 21 and is the component in the battery cell 20 where the electrochemical reaction occurs. Casing 21 may contain one or more electrode assemblies 25. Electrode assembly 25 is mainly formed by winding or stacking positive and negative electrode sheets, and typically a separator is provided between the positive and negative electrode sheets to separate them and prevent internal short circuits. The positive electrode tab 25a and negative electrode tab 25a of electrode assembly 25 may be located together at one end of electrode assembly 25 or separately at both ends of electrode assembly 25. The tab 25a, whose polarity is not limited in this application, can be either a positive electrode tab 25a or a negative electrode tab 25a.

[0194] In the above embodiment, on the same projection plane perpendicular to the thickness direction Z of the first wall, the orthographic projection of the tab 25a falls into the orthographic projection of the second insulating member 24. When the first insulating member 23 melts, the first wall 211 and the tab 25a can be insulated and isolated by the second insulating member 24, reducing the risk of short circuit between the first wall 211 and the tab 25a and improving the reliability of the battery cell 20.

[0195] Please refer to Figure 14 According to some embodiments of this application, the second insulating member 24 is provided with a first notch 24a, and the first wall 211 is provided with an injection hole 211c. When viewed along the thickness direction Z of the first wall, the injection hole 211c is located inside the first notch 24a.

[0196] The first notch 24a can be a hollow structure on the second insulating member 24, and the first notch 24a is used to avoid the injection hole 211c.

[0197] In some embodiments, the first notch 24a may be provided at the edge of the second insulating member 24.

[0198] By providing a first notch 24a on the second insulating member 24, the injection hole 211c can be avoided, so that after the second insulating member 24 is assembled with the first wall 211, the injection hole 211c is not affected by the second insulating member 24, which facilitates the injection of electrolyte from the injection hole 211c.

[0199] Please refer to Figure 14 and further refer to Figure 15 , Figure 15 This is a schematic diagram of the structure of a first insulating member provided in some embodiments of this application. According to some embodiments of this application, a second insulating member 24 is provided with a second notch 24b, and a first insulating member 23 has a first hot-melt column 23b for connection with a first wall 211. When viewed along the thickness direction Z of the first wall, the first hot-melt column 23b is located within the second notch 24b.

[0200] The second notch 24b can be a hollow structure on the second insulating member 24, and the second notch 24b is used to avoid the first hot melt pillar 23b.

[0201] The first wall 211 is provided with a first hot-melt groove 211d that mates with the first hot-melt post 23b of the first insulating member 23. The first hot-melt post 23b can be embedded in a first hot-melt groove 211d to achieve assembly of the first insulating member 23 and the first wall 211 by hot-melt. Please refer to Figure 14 On the same projection plane perpendicular to the thickness direction Z of the first wall, the orthographic projection of the first hot-melt groove 211d falls into the orthographic projection of the second notch 24b.

[0202] The first insulating member 23 also has a plurality of second hot-melt pillars 23c for connecting with the first wall 211, the second hot-melt pillars 23c being spaced apart from the second insulating member 24. The first wall 211 is also provided with a plurality of second hot-melt grooves 211e that cooperate with the second hot-melt pillars 23c of the first insulating member 23, each second hot-melt pillar 23c being embedded in a second hot-melt groove 211e, so that the first insulating member 23 and the first wall 211 are assembled by hot-melt.

[0203] By providing a second notch 24b on the second insulating member 24, the first hot melt column 23b connecting the first insulating member 23 and the first wall 211 can be avoided, which helps to reduce the risk of interference between the second insulating member 24 and the assembly of the first insulating member 23 and the first wall 211.

[0204] Please refer to Figure 16 , Figure 16 This is a schematic diagram of a first insulating member and a second insulating member provided for some embodiments of this application. According to some embodiments of this application, on the same projection plane perpendicular to the thickness direction Z of the first wall, the orthographic projection of the second insulating member 24 does not overlap with the orthographic projection of the first insulating member 23.

[0205] The second insulating member 24 and the first insulating member 23 can be distributed sequentially on a plane perpendicular to the thickness direction Z of the first wall, and the thickness of the second insulating member 24 can be the same as the thickness of the first insulating member 23.

[0206] The orthographic projection of the second insulating member 24 does not overlap with the orthographic projection of the first insulating member 23, which can reduce the space occupied by the second insulating member 24 in the thickness direction Z of the first wall. This results in a smaller space occupied in the thickness direction Z of the first wall after the first wall 211, the first insulating member 23, the second insulating member 24 and the flange portion 222 are assembled, which is conducive to improving the energy density of the battery cell 20.

[0207] According to some embodiments of this application, the melting point of the second insulating element 24 is T, which satisfies 200℃≤T≤400℃.

[0208] If the melting point of the second insulating element 24 is too low, it will easily melt when heated; if the melting point of the second insulating element 24 is too high, the manufacturing cost will be high.

[0209] By selecting the melting point of the second insulating element 24 to be greater than or equal to 200°C, the risk of the second insulating element 24 melting due to heat can be reduced; by selecting the melting point of the second insulating element 24 to be less than or equal to 400°C, the manufacturing cost can be reduced.

[0210] In some embodiments, the melting point of the second insulating member 24 may be, but is not limited to, any one or any two of 200°C, 220°C, 240°C, 260°C, 300°C, 320°C, 340°C, 350°C, 370°C, 380°C, or 400°C.

[0211] According to some embodiments of this application, 260℃≤T≤350℃.

[0212] By selecting the melting point of the second insulating component 24 to be greater than or equal to 260°C, the risk of the second insulating component 24 melting due to heat is further reduced; by selecting the melting point of the second insulating component 24 to be less than or equal to 350°C, the manufacturing cost is further reduced.

[0213] According to some embodiments of this application, the thickness of the second insulating member 24 is H along the thickness direction Z of the first wall, satisfying 0.02mm≤H≤0.60mm.

[0214] If the thickness of the second insulating member 24 along the thickness direction Z of the first wall is too thin, the insulation effect of the second insulating member 24 will be poor, which will easily lead to a short circuit between the first wall 211 and the flange portion 222. If the thickness of the second insulating member 24 along the thickness direction Z of the first wall is too thick, it will occupy a large assembly space in the thickness direction Z of the first wall, resulting in wasted space and affecting the energy density of the battery cell 20.

[0215] By setting the thickness of the second insulating member 24 along the thickness direction Z of the first wall to be greater than or equal to 0.02 mm, the risk of short circuit between the first wall 211 and the flange portion 222 can be reduced, thereby improving the reliability of the battery cell 20. By setting the thickness of the second insulating member 24 along the thickness direction Z of the first wall to be less than or equal to 0.60 mm, the space occupied by the second insulating member 24 in the thickness direction Z of the first wall can be reduced, which is beneficial to improving the energy density of the battery cell 20.

[0216] In some embodiments, the thickness of the second insulating member 24 along the thickness direction Z of the first wall can be, but is not limited to, any one or any two of 0.02 mm, 0.06 mm, 0.10 mm, 0.12 mm, 0.16 mm, 0.20 mm, 0.22 mm, 0.26 mm, 0.30 mm, 0.32 mm, 0.36 mm, 0.40 mm, 0.42 mm, 0.46 mm, 0.50 mm, 0.52 mm, 0.56 mm, or 0.60 mm.

[0217] According to some embodiments of this application, 0.1mm ≤ H ≤ 0.5mm.

[0218] By setting the thickness of the second insulating member 24 along the thickness direction Z of the first wall to be greater than or equal to 0.1 mm, the risk of short circuit between the first wall 211 and the flange portion 222 is further reduced, thereby improving the reliability of the battery cell 20. By setting the thickness of the second insulating member 24 along the thickness direction Z of the first wall to be less than or equal to 0.5 mm, the space occupied by the second insulating member 24 in the thickness direction Z of the first wall is further reduced, which is beneficial to improving the energy density of the battery cell 20.

[0219] According to some embodiments of this application, the second insulating element 24 is insulating adhesive paper.

[0220] The second insulating element 24 is insulating adhesive paper. The second insulating element 24 includes a substrate layer and an adhesive layer. In an embodiment where the second insulating element 24 is connected to the flange portion 222, the substrate layer is connected to the flange portion 222 through the adhesive layer. In an embodiment where the second insulating element 24 is connected to the first wall 211, the substrate layer is connected to the first wall 211 through the adhesive layer.

[0221] Insulating tape facilitates assembly and reduces assembly difficulty.

[0222] Please refer to Figure 4 , Figure 6 , Figure 8 , Figure 9 , Figure 11 According to some embodiments of this application, the battery cell 20 further includes a sealing member 27, which is located between the first wall 211 and the electrode terminal 22 and is used to seal the gap between the first wall 211 and the electrode terminal 22; on the same projection plane perpendicular to the thickness direction Z of the first wall, the orthographic projection of the second insulating member 24 and the orthographic projection of the sealing member 27 do not overlap.

[0223] In some embodiments, the seal 27 includes a first segment and a second segment connected to each other. At least a portion of the first segment is disposed within the electrode lead-out hole 211a, and the second segment is disposed around the first segment, sandwiched between the first wall 211 and the flange portion 222. In embodiments where the second insulating member 24 is connected to the flange portion 222, the second insulating member 24 and the second segment are spaced apart on the flange portion 222, and on the same projection plane perpendicular to the thickness direction Z of the first wall, the orthographic projection of the second insulating member 24 and the orthographic projection of the second segment do not overlap.

[0224] By providing a sealing element 27 between the first wall 211 and the electrode terminal 22, the gap between the first wall 211 and the electrode terminal 22 can be sealed; by setting the orthographic projection of the second insulating element 24 to not overlap with the orthographic projection of the sealing element 27, the sealing effect of the second insulating element 24 on the first wall 211 and the electrode terminal 22 can be reduced, so that the first wall 211 and the electrode terminal 22 have a better sealing effect.

[0225] According to some embodiments of this application, this application also provides a battery device 100, which includes a battery cell 20 provided according to any of the above embodiments.

[0226] According to some embodiments of this application, this application also provides an electrical device, which includes a battery cell 20 provided according to any of the above embodiments, the battery cell 20 being used to provide electrical energy; or, the electrical device includes a battery device 100 provided according to the above embodiments, the battery device 100 being used to provide electrical energy.

[0227] According to some embodiments of this application, please refer to Figures 3 to 15 This application provides a battery cell 20, which includes a housing 21, electrode terminals 22, a first insulating member 23 and a second insulating member 24.

[0228] The outer casing 21 includes a housing 21a and an end cap 21b. The housing 21a has an opening, and the end cap 21b closes the opening. The end cap 21b is a first wall 211, and the first wall 211 is provided with an electrode lead-out hole 211a.

[0229] The electrode terminal 22 includes a main body 221 and a flange 222. The main body 221 passes through the electrode lead-out hole 211a, and the flange 222 protrudes from the outer peripheral surface of the main body 221. The flange 222 is located inside the first wall 211.

[0230] Along the thickness direction Z of the first wall, at least a portion of the first insulating member 23 is located between the first wall 211 and the flange 222, and at least a portion of the second insulating member 24 is located between the first wall 211 and the flange 222. On the same projection plane perpendicular to the thickness direction Z of the first wall, the orthographic projection of the second insulating member 24 at least partially overlaps with the orthographic projection of the first insulating member 23, and the second insulating member 24 is in contact with the first insulating member 23. For example, the second insulating member 24 may be located between the flange 222 and the first insulating member 23, and the second insulating member 24 may be connected to the flange 222; or, the second insulating member 24 may be located between the first wall 211 and the first insulating member 23, and the second insulating member 24 may be connected to the first wall 211. The melting point of the second insulating member 24 is higher than the melting point of the first insulating member 23.

[0231] According to the battery cell 20 of this application embodiment, at least a portion of the second insulating member 24 is disposed between the first wall 211 and the flange portion 222. The orthographic projection of the second insulating member 24 at least partially overlaps with the orthographic projection of the first insulating member 23, so that after the first insulating member 23 melts, the second insulating member 24 can insulate and isolate the first wall 211 and the flange portion 222, thereby reducing the risk of short circuit between the first wall 211 and the flange portion 222 and improving the reliability of the battery cell 20.

[0232] Although this application has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of this application. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized in that, include: The outer casing includes a first wall, the first wall being provided with electrode lead-out holes; An electrode terminal is disposed on the first wall. The electrode terminal includes a main body and a flange. The main body passes through the electrode lead-out hole, and the flange protrudes from the outer peripheral surface of the main body. The flange is located on the inner side of the first wall. A first insulating member, along the thickness direction of the first wall, at least a portion of the first insulating member is located between the first wall and the flange portion; A second insulating member is provided, along the thickness direction of the first wall, at least a portion of the second insulating member is located between the first wall and the flange, the second insulating member is in contact with the first insulating member, and the melting point of the second insulating member is higher than that of the first insulating member.

2. The battery cell according to claim 1, characterized in that, Along the thickness direction of the first wall, the second insulating member is at least partially located between the first insulating member and the flange.

3. The battery cell according to claim 2, characterized in that, The second insulating element is connected to the flange portion.

4. The battery cell according to claim 3, characterized in that, The flange portion has a first surface, a second surface, and a first outer peripheral surface. Along the thickness direction of the first wall, the first surface faces the first wall, the second surface faces away from the first wall, and the first outer peripheral surface connects the first surface and the second surface. The second insulating member includes a first part and a second part, the first part being disposed on the first surface and the second part being disposed on the first outer peripheral surface.

5. The battery cell according to claim 1, characterized in that, Along the thickness direction of the first wall, the second insulating element is at least partially located between the first wall and the first insulating element.

6. The battery cell according to claim 5, characterized in that, The second insulating element is connected to the first wall.

7. The battery cell according to claim 5, characterized in that, The first insulating member has a first groove on the side facing the first wall, and the second insulating member is at least partially accommodated in the first groove.

8. The battery cell according to claim 7, characterized in that, Along the thickness direction of the first wall, the depth of the first groove is d, which satisfies 0.1mm≤d≤0.7mm.

9. The battery cell according to claim 8, characterized in that, 0.2mm≤d≤0.6mm.

10. The battery cell according to claim 6, characterized in that, The inner surface of the first wall is provided with a second groove, the electrode lead-out hole penetrates the bottom wall of the second groove, and at least a portion of the flange is accommodated in the second groove; The second insulating element is at least partially disposed on the bottom surface of the second groove.

11. The battery cell according to claim 10, characterized in that, The second insulating member includes a third part and a fourth part that are connected to each other. The third part is disposed on the bottom surface of the second groove, and the fourth part is disposed on the side surface of the second groove.

12. The battery cell according to claim 11, characterized in that, The second insulating element further includes a fifth portion disposed on the inner surface of the first wall, and the fourth portion connects the third portion and the fifth portion.

13. The battery cell according to claim 5, characterized in that, The battery cell also includes an electrode assembly, which has tabs that are electrically connected to the electrode terminals. On the same projection plane perpendicular to the thickness direction of the first wall, the orthographic projection of the tab falls within the orthographic projection of the second insulating member.

14. The battery cell according to claim 5, characterized in that, The second insulating component is provided with a first notch, and the first wall is provided with a liquid injection hole. When viewed along the thickness direction of the first wall, the liquid injection hole is located within the first notch.

15. The battery cell according to claim 5, characterized in that, The second insulating member is provided with a second notch, and the first insulating member has a first hot-melt column for connecting with the first wall. When viewed along the thickness direction of the first wall, the first hot-melt column is located within the second notch.

16. The battery cell according to claim 1, characterized in that, On the same projection plane perpendicular to the thickness direction of the first wall, the orthographic projection of the second insulating element does not overlap with the orthographic projection of the first insulating element.

17. The battery cell according to any one of claims 1-16, characterized in that, The melting point of the second insulating component is T, which satisfies 200℃≤T≤400℃.

18. The battery cell according to claim 17, characterized in that, 260℃≤T≤350℃。 19. The battery cell according to any one of claims 1-16, characterized in that, Along the thickness direction of the first wall, the thickness of the second insulating element is H, which satisfies 0.02mm≤H≤0.60mm.

20. The battery cell according to claim 19, characterized in that, 0.1mm≤H≤0.5mm.

21. The battery cell according to any one of claims 1-16, characterized in that, The second insulating component is insulating tape.

22. The battery cell according to any one of claims 1-16, characterized in that, The battery cell also includes a sealing element, which is located between the first wall and the electrode terminal to seal the gap between the first wall and the electrode terminal; On the same projection plane perpendicular to the thickness direction of the first wall, the orthographic projection of the second insulating element does not overlap with the orthographic projection of the sealing element.

23. A battery device, characterized in that, Includes the battery cell as described in any one of claims 1-22.

24. An electrical appliance, characterized in that, The electrical device includes a battery cell as described in any one of claims 1-22, the battery cell being used to provide electrical energy; or, the electrical device includes a battery device as described in claim 23, the battery device being used to provide electrical energy.

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