Battery cell, battery device, and electric device

Abstract

The application discloses a battery monomer, a battery device and a power utilization equipment. The battery monomer comprises a shell, a first end cover assembly, an electrode assembly, a first insulating piece and a second insulating piece. The shell has a first opening on one side along a first direction, and comprises two first shell walls which are spaced apart along a second direction. The first end cover assembly is connected to the shell and covers the first opening. The electrode assembly comprises a main body and a first tab, the first tab is connected to the main body, and at least part of the first tab is located between the first end cover assembly and the main body along the first direction. The side of the first end cover assembly facing the main body is provided with a recess, the recess penetrates through the first end cover assembly along the second direction, and the first tab is at least partially accommodated in the recess. The first insulating piece is wrapped on the outer side of at least part of the main body and is connected to the first end cover assembly. At least part of the second insulating piece and part of the first insulating piece are arranged in a stack between the first shell wall and the first tab along the second direction.

Description

[0001] Cross-references to related applications

[0002] This application claims priority to PCT application No. PCT / CN2025 / 145260, filed on December 24, 2025, entitled “Battery Cell, Battery Device and Electrical Equipment”, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application relates to the field of batteries, and in particular to a battery cell, battery device, and electrical equipment. Background Technology

[0004] Batteries are widely used in electronic devices such as mobile phones, laptops, electric vehicles, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes, and power tools, etc.

[0005] In the development of battery technology, improving the reliability of individual battery cells is a key research direction. Utility Model Content

[0006] This application provides a battery cell, a battery device, and an electrical appliance, which helps to improve the reliability of the battery cell.

[0007] According to a first aspect of this application, a battery cell is provided, comprising a housing, a first end cap assembly, an electrode assembly, a first insulating member, and a second insulating member. The housing has a first opening on one side along a first direction, and includes two first housing walls spaced apart along a second direction perpendicular to the first direction. The first end cap assembly is connected to the housing and covers the first opening. The electrode assembly includes a main body and a first tab, the main body being housed in the housing, and the first tab being connected to the main body. Along the first direction, at least a portion of the first tab is located between the first end cap assembly and the main body, and the second direction is parallel to the thickness direction of the electrode assembly. Along the first direction, the first end cap assembly has a recess on the side facing the main body, the recess penetrating the first end cap assembly along the second direction, and the first tab is at least partially housed in the recess. The first insulating member covers at least a portion of the main body and is connected to the first end cap assembly. Along the second direction, at least a portion of the second insulating member and a portion of the first insulating member are stacked between the first housing wall and the first tab.

[0008] Both the first insulating element and the second insulating element can prevent the first electrode tab from overlapping with the first housing wall. A portion of the first insulating element and at least a portion of the second insulating element are stacked between the first housing wall and the first electrode tab, forming a double-layer insulation barrier between the first housing wall and the first electrode tab. This helps to reduce the risk of short circuits or housing corrosion caused by the overlap of the first housing wall and the first electrode tab due to warping, wrinkling, or damage of either the first insulating element or the second insulating element, thereby improving the reliability of the battery cell.

[0009] The recess extends through the first end cap assembly, which increases the size of the recess along the second direction, reduces interference between the first tab and the first end cap assembly, and lowers the risk of the first tab being damaged or cracked. The first tab is at least partially accommodated in the recess, and the first tab and the first end cap assembly share a portion of the space in the first direction, which is beneficial for improving the energy density of the battery cell.

[0010] In some embodiments, along a third direction, the size of the second insulating member is greater than or equal to the size of the first tab, and both ends of the first tab along the third direction do not extend beyond the second insulating member; the first direction, the second direction, and the third direction are perpendicular to each other. The second insulating member can prevent the first tab from overlapping with the first housing wall in any region along the third direction, thereby improving the insulation and isolation effect of the second insulating member on the first tab and the first housing wall.

[0011] In some embodiments, in the same plane perpendicular to the second direction, the orthographic projection of the first electrode is located within the orthographic projection of the second insulating member. Along the second direction, the second insulating member can completely cover the first electrode, preventing any area of ​​the first electrode from overlapping with the first housing wall, thereby improving the insulation and isolation effect of the second insulating member on the first electrode and the first housing wall.

[0012] In some embodiments, at least one end of the second insulating member extends beyond the first tab along a third direction, with the first direction, second direction, and third direction being perpendicular to each other. The dimension by which the second insulating member extends beyond the first tab along the third direction is greater than or equal to 1 mm. This helps to reduce the risk of insulation failure caused by edge warping or tearing of the second insulating member along the second direction, thereby improving the insulation isolation effect.

[0013] In some embodiments, the first end cap assembly includes a first end cap and a third insulating member. At least a portion of the third insulating member is disposed between the first end cap and the main body portion along a first direction. A recess extends through the third insulating member along a second direction, and the first insulating member is connected to the third insulating member. The third insulating member can insulate and isolate the electrode assembly and the first end cap, reducing the risk of short circuits. The recess extends through the third insulating member along the second direction, and at least a portion of the third insulating member is located on both sides of the first electrode tab along the third direction, thereby insulating and isolating the first electrode tab from the second housing wall, reducing the risk of overlap between the first electrode tab and the second housing wall.

[0014] In some embodiments, the third insulating member includes at least two support portions spaced apart along a third direction, the support portions abutting against the main body portion, the first direction, the second direction, and the third direction being perpendicular to each other; along the third direction, a recess is located between two adjacent support portions, and the first insulating member is connected to the support portions. The at least two support portions provide multiple connection points for the first insulating member, which helps improve the connection stability between the first insulating member and the first end cap assembly. The portion of the first insulating member overlapping the recess is more prone to warping or folding due to the lack of connection and support. The second insulating member is stacked between the first housing wall and the first tab, which helps prevent the first tab and the first housing wall from overlapping after the first insulating member warps or folds, reducing the risk of housing corrosion.

[0015] In some embodiments, the third insulating member includes a connecting portion that connects two adjacent support portions. At least a portion of the support portion protrudes from a first surface of the connecting portion facing the main body portion along a first direction, and a recess is located on the side of the connecting portion closer to the main body portion along the first direction. The connection of two adjacent support portions to form a single unit facilitates assembly, limits displacement of the support portions along a third direction, improves the stability of the support portions, and helps control the spacing between two adjacent support portions, i.e., controlling the size of the recess along a third direction, reducing the risk of interference between the first electrode tab and the support portion, thus damaging the first electrode tab.

[0016] In some embodiments, along the third direction, the size of the second insulating member is less than or equal to the size of the recess, and both ends of the second insulating member along the third direction do not extend beyond the recess. The first direction, the second direction, and the third direction are perpendicular to each other. The fact that both ends of the second insulating member do not extend beyond the recess along the third direction helps reduce interference between the second insulating member and other structures, and lowers the risk of the edges of the second insulating member warping or tearing under the interference of other structures.

[0017] In some embodiments, the first end cap assembly includes a first end cap and a third insulating member. At least a portion of the third insulating member is disposed between the first end cap and the main body portion along a first direction. The second insulating member includes a first insulating portion and a second insulating portion. At least a portion of the first insulating portion is disposed between the electrode assembly and the first housing wall along a second direction, and at least a portion of the second insulating portion is disposed between the electrode assembly and the first end cap along the first direction. The first insulating portion insulates and isolates the electrode assembly from the first housing wall. The provision of the second insulating portion facilitates increasing the insulating area of ​​the second insulating member and also facilitates the cooperation between the second insulating member and other structures (such as the first end cap assembly), making the installation and fixation of the second insulating member easier.

[0018] In some embodiments, the battery cell includes an electrode terminal and a first adapter. The electrode terminal is disposed on a first end cap assembly, and the first adapter is disposed on the side of the main body near the first end cap assembly, connecting a first tab and the electrode terminal. Along a first direction, at least a portion of a second insulating portion is disposed between the first adapter and a third insulating portion. The second insulating portion is confined between the first adapter and the third insulating portion, which facilitates the arrangement of the second insulating portion using the gap between the first adapter and the third insulating portion, thereby improving space utilization.

[0019] In some embodiments, the electrode terminal includes a first limiting portion. Along a first direction, at least a portion of the first limiting portion and the second insulating portion are disposed between the third insulating member and the first adapter. In the same plane perpendicular to the first direction, the orthographic projections of the first limiting portion and the second insulating portion are spaced apart. The space occupied by the first limiting portion in the first direction can be used to arrange the second insulating portion. In the first direction, there is no thickness overlap between the first limiting portion and the second insulating portion, which is beneficial to improving space utilization and increasing the energy density of the battery cell.

[0020] In some embodiments, the second insulating member is fixed to the first end cap assembly. This helps to improve the accuracy of the relative position of the second insulating member and the first tab, reduces the displacement of the second insulating member, and improves the insulation effect.

[0021] In some embodiments, at least a portion of the second insulating part is sandwiched between the first end cap and the third insulating member. This improves the installation stability of the second insulating member and simplifies the assembly process of the second insulating part.

[0022] In some embodiments, the battery cell includes an electrode terminal disposed on a first end cap assembly and electrically connected to a first tab; along a first direction, a portion of the electrode terminal is located on the side of the first end cap assembly closer to the electrode assembly, and at least a portion of the second insulating portion is clamped between the electrode terminal and the third insulating member. Fixing the second insulating member to the first end cap assembly by assembling the electrode terminal and the first end cap assembly improves the stability of the second insulating member and simplifies the assembly process.

[0023] In some embodiments, the second insulating portion is provided with a limiting hole extending through a first direction; the battery cell includes an electrode terminal, which is disposed on the first end cap assembly and electrically connected to the first tab, with the electrode terminal passing through the limiting hole. In this way, the second insulating component can be positioned by the mutual cooperation of the second insulating portion and the electrode terminal, reducing the risk of misalignment between the second insulating component and the first tab, and improving the insulation isolation effect.

[0024] In some embodiments, the second insulating member includes two first insulating portions spaced apart along a second direction, and the second insulating portion connects the two first insulating portions. Along the second direction, at least a portion of one of the first insulating portions is disposed between the first tab and one of the first housing walls, and at least a portion of the other first insulating portion is disposed between the first tab and the other first housing wall. The two first insulating portions, respectively on both sides of the second direction, insulate and isolate the first tab and the two first housing walls, which helps to reduce the risk of short circuits or housing corrosion caused by the first tab overlapping with either of the first housing walls. The second insulating portion connects the two first insulating portions, which not only simplifies the structure of the second insulating member but also helps to tighten the entire second insulating member, improving the insulation and isolation effect of the second insulating member.

[0025] In some embodiments, the orthographic projection of the second insulating member partially overlaps with the orthographic projection of the main body portion in the same plane perpendicular to the second direction. This is beneficial for increasing the size of the second insulating member along the first direction, reducing the risk of insulation failure due to edge warping or tearing of the second insulating member; it also helps to increase the number of connection points between the second insulating member and other structures, for example, the second insulating member can be connected to the main body portion, improving the robustness of the second insulating member.

[0026] In some embodiments, the dimension of the portion of the second insulating member overlapping the main body along the first direction is L1, and the dimension of the main body along the first direction is L2, where L1 ≥ 5 mm and L1 / L2 ≤ 0.5. A larger L1 (greater than or equal to 5 mm) along the first direction reduces the risk of insulation failure due to edge warping or tearing of the second insulating member. A L1 / L2 (less than or equal to 0.5) limits the dimension of the overlapping portion along the first direction, reducing interference between the second insulating member and other structures during assembly and simplifying assembly. It also reduces the probability of wrinkles forming at the overlapping portion, improving the flatness of the second insulating member and reducing the space occupied by it.

[0027] In some embodiments, the battery cell includes electrode terminals and a first adapter. The electrode terminals are disposed on a first end cap assembly. Along a first direction, the first adapter is disposed between the main body and the first end cap assembly, and the first adapter connects a first tab and the electrode terminals. Along a second direction, a portion of a second insulating member and a portion of a first insulating member are stacked between the first adapter and a first housing wall. A double-layer insulation is formed between the first housing wall and the first adapter, which helps to reduce the risk of the first housing wall and the first adapter overlapping due to warping, wrinkling, or damage of either the first or second insulating member, thereby improving the reliability of the battery cell.

[0028] In some embodiments, along a third direction, the size of the second insulating member is greater than or equal to the size of the first adapter, and the two ends of the first adapter along the third direction do not extend beyond the second insulating member; the first direction, the second direction, and the third direction are perpendicular to each other. The second insulating member can prevent the first adapter from overlapping with the first housing wall in any region along the third direction, thereby improving the insulation and isolation effect of the second insulating member on the first adapter and the first housing wall.

[0029] In some embodiments, in the same plane perpendicular to the second direction, the orthographic projection of the first adapter lies within the orthographic projection of the second insulating member. Along the second direction, the second insulating member can completely cover the first adapter, preventing any area of ​​the first adapter from overlapping with the first shell wall, thereby improving the insulation and isolation effect of the second insulating member on the first adapter and the first shell wall.

[0030] In some embodiments, along the second direction, the total thickness of the stacked portion of the first and second insulating elements is greater than or equal to 0.15 mm. This helps reduce the risk of the first and second insulating elements being punctured by metal particles or burrs, thereby improving the insulation effect.

[0031] In some embodiments, at least a portion of the second insulating member is located between the first insulating member and the first tab along the second direction. This helps to reduce interference between the first insulating member and the second insulating member during the process of the first insulating member covering the main body, and also helps to determine the relative position between the second insulating member and the first tab before the first insulating member covers the main body, thereby improving the insulation and isolation effect of the second insulating member.

[0032] In some embodiments, along the second direction, a portion of the second insulating member is disposed between the main body and the first insulating member, and connected to at least one of the main body and the first insulating member. The main body and the first insulating member can provide a large surface area for connection with the second insulating member, which is beneficial to improving the robustness and stability of the second insulating member.

[0033] In some embodiments, the battery cell includes an adhesive member that is bonded to the main body and to the portion of the second insulating member located between the main body and the first insulating member. By bonding the main body and the second insulating member with the adhesive member, the second insulating member can be fixed in place, and the second insulating member itself may not have an adhesive layer. This helps reduce impurities such as dust or particulate matter adhering to the surface of the second insulating member, lowering the risk of wear or puncture to both the second and first insulating members by impurities.

[0034] In some embodiments, a portion of the second insulating member is disposed on the side of the first insulating member away from the electrode assembly along the second direction and is connected to the first insulating member. In this way, the second insulating member provides a certain degree of protection to the first insulating member, which helps to reduce the phenomenon of warping or damage to the first insulating member.

[0035] In some embodiments, the material of the second insulating element includes polyethylene terephthalate (PET) and / or polyimide. PET and / or polyimide have high tensile strength and elastic modulus, strong puncture resistance, and are also beneficial in resisting mechanical impacts from the expansion and contraction of the electrode assembly, reducing the risk of the second insulating element breaking. PET and / or polyimide also have good electrical insulation and chemical stability, which helps reduce the risk of the second insulating element being corroded by the electrolyte and improves the insulation effect.

[0036] In some embodiments, the electrode assembly includes a second tab, the first tab and the second tab having opposite polarities. The second tab is connected to the main body and electrically connected to the housing. The housing is energized; if the first tab and the housing come into contact, it will cause a short circuit. The first insulating member and the second insulating member form a double-layer insulation barrier between the first housing wall and the first tab, which helps to prevent the first tab and the first housing wall from coming into contact, reducing the risk of a short circuit.

[0037] In some embodiments, the housing has a second opening, which is disposed opposite to the first opening along a first direction; the battery cell includes a second end cap assembly, which includes a second end cap connected to the housing and covering the second opening, and a second electrode tab is electrically connected to the second end cap. The second end cap can serve as another electrode terminal, which helps to eliminate the need for additional electrode terminals and simplifies the structure of the battery cell.

[0038] In some embodiments, the second end cap has a first through hole; the second tab is accommodated within the housing, and the battery cell includes a second adapter, which connects to the second tab and passes through the first through hole. Along a first direction, a portion of the second adapter is located on the side of the second end cap away from the main body and is welded to the second end cap. Welding the second adapter to the second end cap on the side of the second end cap away from the main body helps reduce the probability of welding particles falling into the housing, thus reducing the risk of internal short circuits in the battery cell; it also helps reduce the adverse effects of welding heat on the solder marks of the second tab and the second adapter.

[0039] According to a second aspect of this application, this application also provides a battery device comprising a battery cell provided in any of the embodiments.

[0040] According to a third aspect of this application, this application also provides an electrical device that includes a battery device provided in any embodiment, the battery device being used to provide electrical energy. Attached Figure Description

[0041] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments of this application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0042] Figure 1 These are schematic diagrams of the vehicle structure provided in some embodiments of this application.

[0043] Figure 2 This is an exploded structural diagram of a battery device provided in some embodiments of this application.

[0044] Figure 3 This is a schematic diagram of the structure of a battery cell provided in some embodiments of this application.

[0045] Figure 4 yes Figure 3 The diagram shows the exploded structure of a single battery cell.

[0046] Figure 5 yes Figure 3 The diagram shows the structural structure of the battery cell casing.

[0047] Figure 6 yes Figure 3 The diagram shows a partial structural schematic of a single battery cell.

[0048] Figure 7 yes Figure 6 An exploded view of the structure shown.

[0049] Figure 8 yes Figure 3 The image shows a front view of a single battery cell.

[0050] Figure 9 It is along Figure 8 The sectional view is taken by the cutting line AA in the diagram.

[0051] Figure 10 yes Figure 9 A magnified view of region B in the middle.

[0052] Figure 11 This is a partial cross-sectional view of a battery cell provided in other embodiments of this application.

[0053] Figure 12 This is a partial cross-sectional view of a battery cell provided in some embodiments of this application.

[0054] Figure 13 This is a partial structural schematic diagram of a battery cell provided in some embodiments of this application.

[0055] The attached figures are labeled as follows:

[0056] 1. Vehicle; 2. Battery unit; 3. Controller; 4. Motor.

[0057] 5. Box body, 5a. First box body section, 5b. Second box body section, 5c. Accommodation space;

[0058] 6. Battery cells;

[0059] 10. Electrode assembly; 11. Main body; 12. First electrode tab; 13. Second electrode tab;

[0060] 20. Shell, 20a. First opening, 20b. Second opening, 21. First shell wall, 22. Second shell wall;

[0061] 30. First end cap assembly; 31. Recess; 32. First end cap; 33. Third insulating member; 331. Support portion; 332. Connecting portion; 332a. First surface;

[0062] 40. First insulating component;

[0063] 50. Second insulating element; 51. First insulating part; 52. Second insulating part; 521. Limiting hole;

[0064] 61. Electrode terminal; 611. Terminal body; 612. First limiting part; 613. Second limiting part;

[0065] 71. First adapter;

[0066] 72. Second adapter;

[0067] 80. Adhesive components;

[0068] 90. Second end cap assembly; 91. Second end cap; 911. First through hole; 92. Fourth insulating component; 93. Cover component;

[0069] X, first direction; Y, second direction; Z, third direction. Detailed Implementation

[0070] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0071] 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 accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0072] In this application, the reference to "embodiment" means that a particular 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 in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.

[0073] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "adhesion" 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 connection 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.

[0074] 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.

[0075] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0076] In this application, "multiple" means two or more (including two).

[0077] In the embodiments of this application, "parallel" includes not only the case of absolute parallelism, but also the case of approximate parallelism as commonly understood in engineering; similarly, "perpendicular" also includes not only the case of absolute perpendicularity, but also the case of approximate perpendicularity as commonly understood in engineering.

[0078] In this embodiment of the application, the battery cell can be a secondary battery cell, which refers to a battery cell that can be used again after being discharged by recharging to activate the active materials.

[0079] The battery cell can be a lithium-ion battery cell, a sodium-ion battery cell, a sodium-lithium-ion battery cell, a lithium metal battery cell, a sodium metal battery cell, a lithium-sulfur battery cell, a magnesium-ion battery cell, a nickel-metal hydride battery cell, a nickel-cadmium battery cell, a lead-acid battery cell, etc., but the embodiments of this application are not limited to this.

[0080] A typical battery cell includes an electrode assembly, a housing, and electrode terminals. The electrode assembly is housed within the housing, and the electrode terminals are located within the housing. The housing encapsulates the electrode assembly and electrolyte components. The electrode assembly includes tabs, which are electrically connected to the electrode terminals via adapters or directly to the electrode terminals. The electrode terminals are used to electrically connect the electrode assembly to external circuitry within the battery cell to enable charging or discharging of the battery cell.

[0081] 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.

[0082] 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.

[0083] In some embodiments, the negative electrode may be a negative electrode sheet, which may include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

[0084] In some implementations, the separator is positioned between the positive and negative electrodes.

[0085] 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.

[0086] 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.

[0087] In some embodiments, the electrode assembly is a wound structure. The positive electrode and the negative electrode are wound into a wound structure.

[0088] In some embodiments, the electrode assembly has a stacked structure.

[0089] 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.

[0090] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells.

[0091] A battery device typically includes a housing for encapsulating one or more individual battery cells. The housing prevents liquids or other foreign matter from affecting the charging or discharging of the individual battery cells.

[0092] As an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells into an independent module. As an example, a battery module can be formed by bundling multiple battery cells together with cable ties. The battery cell assembly can be housed within a housing by fixing the battery module within the housing. As an example, the housing can include a top cover, a frame, and a bottom plate. The top cover and bottom plate are respectively connected to the frame, creating a closed space inside the housing to house the battery cell assembly.

[0093] In some embodiments, the housing may be part of the vehicle's chassis structure. For example, a portion of the housing may be at least a part of the vehicle's floor, or a portion of the housing may be at least a part of the vehicle's crossbeams and longitudinal beams.

[0094] In some embodiments, the battery device may be an energy storage device. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0095] Insulation between the battery cell casing and the electrode assembly is particularly important. The electrode assembly is typically covered with an insulating component to provide insulation and prevent the casing and electrode assembly from overlapping. This insulating component is usually connected to the end cap. When the connection between the insulating component and the end cap is restricted, or when other factors affect the stability of the connection, the insulating component is prone to warping or wrinkling. The tabs are close to the casing wall along the thickness direction of the electrode assembly. If the insulating component warps, wrinkles, or is damaged, the tabs can easily overlap with the casing wall along the thickness direction of the electrode assembly, leading to short circuits or corrosion due to excessively low casing potential, thus affecting the reliability of the battery cell.

[0096] In view of this, the present application provides a technical solution that covers the outer side of the main body of the electrode assembly with a first insulating member and adds a second insulating member, such that a portion of the first insulating member and at least a portion of the second insulating member are stacked between the shell wall and the electrode tab in the thickness direction of the electrode assembly, forming a double-layer insulation between the shell wall and the electrode tab. This helps to reduce the risk of the electrode tab and the shell wall overlapping due to warping, wrinkling or damage of either the first insulating member or the second insulating member, thereby improving the reliability of the battery cell.

[0097] The technical solutions provided in this application are applicable to battery cells, battery devices, and electrical equipment using battery devices.

[0098] The battery device disclosed in this application can be used in electrical devices that use the battery device as a power source or in various energy storage systems that use the battery device as an energy storage element. The electrical devices can be, but are not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Among them, electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc., and spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0099] For ease of explanation, the following embodiments use a vehicle as an example of electrical equipment.

[0100] Figure 1 This is a schematic diagram of the vehicle structure provided in some embodiments of this application. (Refer to...) Figure 1 Vehicle 1 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 2 is installed inside vehicle 1, and the battery device 2 can be located at the bottom, front, or rear of vehicle 1. The battery device 2 can be used to power vehicle 1; for example, the battery device 2 can serve as the operating power source for vehicle 1. Vehicle 1 may also include a controller 3 and a motor 4. The controller 3 is used to control the battery device 2 to supply power to the motor 4, for example, to meet the power needs of vehicle 1 during starting, navigation, and driving.

[0101] In some embodiments of this application, the battery device 2 can not only serve as the operating power source for the vehicle 1, but also as the driving power source for the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.

[0102] Figure 2 This is an exploded structural diagram of a battery device provided in some embodiments of this application. (Refer to...) Figure 2The battery device 2 includes a housing 5 and a battery cell 6, with the battery cell 6 housed within the housing 5. The housing 5 provides a space for the battery cell 6 and can have various structures. In some embodiments, the housing 5 may include a first housing portion 5a and a second housing portion 5b, which overlap each other, together defining a space 5c for accommodating the battery cell 6. The second housing portion 5b may be a hollow structure with one open end, while the first housing portion 5a may be a plate-like structure, covering the open side of the second housing portion 5b so that the first housing portion 5a and the second housing portion 5b together define the space 5c. Alternatively, both the first housing portion 5a and the second housing portion 5b may be hollow structures with one open side, with the open side of the first housing portion 5a overlapping the open side of the second housing portion 5b. Of course, the box 5 formed by the first box part 5a and the second box part 5b can be of various shapes, such as a cylinder, a cuboid, etc.

[0103] To improve the sealing performance after the first housing part 5a and the second housing part 5b are connected, a sealing element, such as sealant or sealing ring, can also be provided between the first housing part 5a and the second housing part 5b.

[0104] Assuming that the first box section 5a covers the top of the second box section 5b, the first box section 5a can also be called the upper box cover, and the second box section 5b can also be called the lower box.

[0105] In the battery device 2, there can be multiple battery cells 6, which can be connected in series, parallel, or in a mixed manner. A mixed connection means that multiple battery cells 6 are connected in both series and parallel configurations. Multiple battery cells 6 can be directly connected in series, parallel, or in a mixed manner, and then the entire assembly of the multiple battery cells 6 is housed within the housing 5. Alternatively, the battery device 2 can also consist of multiple battery cells 6 first connected in series, parallel, or in a mixed manner to form battery modules, and then these battery modules are connected in series, parallel, or in a mixed manner to form a whole, which is also housed within the housing 5. The battery device 2 may also include other structures; for example, it may include a busbar component for electrical connection between the multiple battery cells 6.

[0106] For example, the battery cell 6 may be the smallest unit that makes up the battery device 2.

[0107] Figure 3 These are schematic diagrams of the structure of a single battery cell provided in some embodiments of this application. Figure 4 yes Figure 3 The diagram shows the exploded structure of a single battery cell. Figure 5 yes Figure 3 The diagram shows the structural structure of the battery cell casing. Figure 6 yes Figure 3 A partial structural diagram of a single battery cell is shown. Figure 7 yes Figure 6 An exploded view of the structure shown. Figure 8 yes Figure 3 The image shows a front view of a single battery cell. Figure 9 It is along Figure 8 The sectional view intercepted by section line AA in the diagram. Figure 10 yes Figure 9 An enlarged schematic diagram of region B in the middle. Figure 11 This is a partial cross-sectional view of a battery cell provided in other embodiments of this application. Figure 12 This is a partial cross-sectional view of a battery cell provided in some embodiments of this application. Figure 13 This is a partial structural schematic diagram of a battery cell provided in some embodiments of this application.

[0108] Reference Figures 3 to 13 The battery cell 6 includes an electrode assembly 10, a housing 20, a first end cap assembly 30, a first insulating member 40, and a second insulating member 50. The housing 20 has a first opening 20a on one side along a first direction X. The housing 20 includes two first housing walls 21 spaced apart along a second direction Y, which is perpendicular to the first direction X. The first end cap assembly 30 is connected to the housing 20 and covers the first opening 20a. The electrode assembly 10 includes a main body 11 and a first tab 12. The main body 11 is housed in the housing 20, and the first tab 12 is connected to the main body 11. Along the first direction X, at least a portion of the first tab 12 is located between the first end cap assembly 30 and the main body 11. The second direction Y is parallel to the thickness direction of the electrode assembly 10. Along the first direction X, the first end cap assembly 30 has a recess 31 on the side facing the main body 11. The recess 31 penetrates the first end cap assembly 30 along the second direction Y, and the first tab 12 is at least partially housed in the recess 31. The first insulating member 40 covers at least a portion of the outer side of the main body 11 and is connected to the first end cap assembly 30. Along the second direction Y, at least a portion of the second insulating member 50 and a portion of the first insulating member 40 are stacked between the first housing wall 21 and the first tab 12.

[0109] In one example, the housing 20 is a structure with an opening at one end, which is a first opening 20a.

[0110] In another example, the housing 20 is a structure with openings at both ends, one of which is the first opening 20a.

[0111] The first end cap assembly 30 can be connected to the housing 20 by welding, bonding, snap-fitting or other means.

[0112] The shell 20 can be made of various materials, such as metal. Optionally, the shell 20 can be made of copper, iron, aluminum, steel, aluminum alloy, etc. The shell 20 can be a steel shell, an aluminum shell, or a composite metal shell (such as a copper-aluminum composite shell), etc.

[0113] The housing 20 includes two second shell walls 22 spaced apart along a third direction Z. The first direction X, the second direction Y, and the third direction Z are perpendicular to each other, and the second shell walls 22 are connected to the first shell wall 21. Optionally, the housing 20 is a one-piece molded structure.

[0114] The first electrode 12 can be either a positive electrode or a negative electrode. For example, the first electrode 12 is a negative electrode.

[0115] In one example, the first tab 12 extends from the body portion 11 along a first direction X near the first end cap assembly 30. The first tab 12 may be entirely located between the body portion 11 and the first end cap assembly 30.

[0116] In another example, a first tab 12 extends from the body portion 11 along a second direction Y or a third direction Z, and a portion of the first tab 12 extends to the side of the body portion 11 along a first direction X near the first end cap assembly 30.

[0117] The first insulating element 40 may be connected to the first end cap assembly 30 by heat fusion, bonding or other means.

[0118] The first insulating member 40 may completely cover the main body 11 or cover a portion of the main body 11.

[0119] Optionally, the first insulating member 40 covers at least two surfaces of the main body portion 11 along the second direction Y and two surfaces of the main body portion 11 along the third direction Z. A portion of the first insulating member 40 extends beyond the main body portion 11 and is connected to the first end cap assembly 30 in the direction from the main body portion 11 to the first end cap assembly 30. The portion of the first insulating member 40 extending beyond the main body portion 11 is located between the first housing wall 21 and the first tab 12, thereby insulating and isolating the first housing wall 21 and the first tab 12.

[0120] Optionally, the first insulating element 40 includes an insulating film.

[0121] Along the second direction Y, at least a portion of the second insulating member 50 is disposed between the first housing wall 21 and the first electrode 12, thereby insulating and isolating the first housing wall 21 and the first electrode 12.

[0122] Along the second direction Y, the portion of the first insulating member 40 located between the first housing wall 21 and the first electrode tab 12, and the portion of the second insulating member 50 located between the first housing wall 21 and the first electrode tab 12 are stacked.

[0123] Optionally, a portion of the first insulating member 40 extending beyond the main body 11 is disposed on one side of the first electrode tab 12 along the second direction Y, and another portion of the first insulating member 40 extending beyond the main body 11 is disposed on the other side of the first electrode tab 12 along the second direction Y. A portion of the second insulating member 50 is disposed on one side of the first electrode tab 12 along the second direction Y, and another portion of the second insulating member 50 is disposed on the other side of the first electrode tab 12 along the second direction Y. Along the second direction Y, the portions of the first insulating member 40 and the second insulating member 50 located on the same side of the first electrode tab 12 are stacked.

[0124] Optionally, the second insulating element 50 includes an insulating film or an insulating sheet.

[0125] Both the first insulating member 40 and the second insulating member 50 can prevent the first tab 12 from overlapping with the first housing wall 21. A portion of the first insulating member 40 and at least a portion of the second insulating member 50 are stacked between the first housing wall 21 and the first tab 12, forming a double-layer insulation barrier between the first housing wall 21 and the first tab 12. This helps to reduce the risk of short circuit or corrosion of the housing 20 caused by the overlap of the first tab 12 and the first housing wall 21 due to warping, wrinkling or damage of either the first insulating member 40 or the second insulating member 50, thereby improving the reliability of the battery cell 6.

[0126] The recess 31 penetrates the first end cap assembly 30, which can increase the size of the recess 31 along the second direction Y, reduce interference between the first tab 12 and the first end cap assembly 30, and reduce the risk of the first tab 12 being crushed or cracked. The first tab 12 is at least partially accommodated in the recess 31, and the first tab 12 and the first end cap assembly 30 share part of the space in the first direction X, which is beneficial to improving the energy density of the battery cell 6.

[0127] The recess 31 is open on both sides along the second direction Y, and the first electrode lug 12, which is accommodated in the recess 31, can easily overlap with the first shell wall 21. The first insulating member 40 and the second insulating member 50 form a double-layer insulation barrier between the first shell wall 21 and the first electrode lug 12, which helps to prevent the first electrode lug 12 from overlapping with the first shell wall 21 and reduces the risk of corrosion of the shell 20.

[0128] The recess 31 can be separated from the housing 20 by a portion of the structure of the first end cap assembly 30 on both sides along the third direction Z. The first tab 12, which is accommodated in the recess 31, does not easily overlap with the second housing wall 22.

[0129] In some embodiments, refer to Figure 4 , Figure 6 and Figure 7 Along the third direction Z, the size of the second insulating member 50 is greater than or equal to the size of the first electrode 12, and the two ends of the first electrode 12 along the third direction Z do not extend beyond the second insulating member 50. The first direction X, the second direction Y and the third direction Z are perpendicular to each other.

[0130] The second insulating member 50 can prevent the first tab 12 from overlapping with the first shell wall 21 in any area of ​​the third direction Z, thereby improving the insulation and isolation effect of the second insulating member 50 on the first tab 12 and the first shell wall 21.

[0131] In some embodiments, in the same plane perpendicular to the second direction Y, the orthographic projection of the first tab 12 lies within the orthographic projection of the second insulator 50.

[0132] Along the second direction Y, the second insulating member 50 can completely cover the first tab 12, preventing any area of ​​the first tab 12 from overlapping with the first shell wall 21, thereby improving the insulation and isolation effect of the second insulating member 50 on the first tab 12 and the first shell wall 21.

[0133] In some embodiments, at least one end of the second insulating member 50 extends beyond the first tab 12 along the third direction Z, and the first direction X, the second direction Y, and the third direction Z are mutually perpendicular. The dimension by which the second insulating member 50 extends beyond the first tab 12 along the third direction Z is greater than or equal to 1 mm. This helps to reduce the risk of insulation failure caused by edge warping or tearing of the second insulating member 50 along the second direction Y, and improves the insulation isolation effect.

[0134] In one example, along the third direction Z, one end of the second insulator 50 extends beyond one end of the first tab 12, and the other end of the second insulator 50 is flush with the other end of the first tab 12.

[0135] In another example, along the third direction Z, the two ends of the second insulator 50 extend beyond the two ends of the first tab 12.

[0136] The dimension of the second insulating member 50 extending beyond the first tab 12 along the third direction Z refers to the dimension of the portion of the second insulating member 50 extending beyond the first tab 12 on one side.

[0137] Optionally, the second insulating member 50 extends beyond the first tab 12 in the third direction Z by a dimension of 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, 5.5 mm, 6 mm, 6.5 mm, 7 mm, or any value between two of these.

[0138] In some embodiments, the first end cap assembly 30 includes a first end cap 32 and a third insulating member 33. At least a portion of the third insulating member 33 is disposed between the first end cap 32 and the main body portion 11 along a first direction X. A recess 31 penetrates the third insulating member 33 along a second direction Y, and a first insulating member 40 is connected to the third insulating member 33.

[0139] The first end cap 32 is connected to the housing 20 and covers the first opening 20a. The shape of the first end cap 32 is adapted to the shape of the housing 20. For example, the housing 20 is cuboid and the first end cap 32 is square.

[0140] The material of the first end cap 32 can be the same as or different from the material of the shell 20.

[0141] The third insulating element 33 is connected to the first end cap 32. The connection method between the third insulating element 33 and the first end cap 32 includes, but is not limited to, heat fusion or bonding.

[0142] The material of the third insulating element 33 can be various. For example, the third insulating element 33 is a plastic part.

[0143] The third insulating member 33 can insulate and isolate the electrode assembly 10 and the first end cap 32, reducing the risk of short circuit. The recess 31 penetrates the third insulating member 33 along the second direction Y, and at least a portion of the third insulating member 33 is located on both sides of the first electrode tab 12 along the third direction Z, thereby insulating and isolating the first electrode tab 12 from the second shell wall 22 and reducing the risk of the first electrode tab 12 and the second shell wall 22 overlapping.

[0144] In some embodiments, refer to Figure 4 , Figure 6 and Figure 7 The third insulating member 33 includes at least two support portions 331 spaced apart along the third direction Z. The support portions 331 are used to abut against the main body portion 11. The first direction X, the second direction Y, and the third direction Z are perpendicular to each other. Along the third direction Z, the recess 31 is located between two adjacent support portions 331, and the first insulating member 40 is connected to the support portion 331.

[0145] The support part 331 can abut against the main body part 11, which helps to reduce the shaking of the main body part 11.

[0146] In one example, there are two supports 331 and one recess 31, with the recess 31 located between the two supports 331.

[0147] In another example, there are three or more support portions 331 and two or more recesses 31, with one recess 31 between every two adjacent support portions 331. There may be one first electrode tab 12, which is at least partially accommodated in any one of the recesses 31. Alternatively, there may be multiple first electrode tabs 12, each at least partially accommodated in a multiple recesses 31.

[0148] The first insulating member 40 extends a portion of the main body 11 along the first direction X, overlaps with the support portion 331, and is connected to the support portion 331. At least two support portions 331 provide multiple connection points for the first insulating member 40, which helps to improve the connection stability between the first insulating member 40 and the first end cap assembly 30.

[0149] The portion of the first insulating member 40 extending beyond the main body 11 along the first direction X overlaps with the recess 31 along the second direction Y. The overlapping portion of the first insulating member 40 and the recess 31 is more prone to warping or folding due to the lack of connection and support. The second insulating member 50 is stacked between the first shell wall 21 and the first tab 12, which helps prevent the first tab 12 from overlapping with the first shell wall 21 after the first insulating member 40 warps or folds, reducing the risk of corrosion of the shell 20.

[0150] In some embodiments, refer to Figure 4 , Figure 6 and Figure 7 The third insulating member 33 includes a connecting portion 332 that connects two adjacent support portions 331. At least a portion of the support portion 331 protrudes from a first surface 332a of the connecting portion 332 facing the main body portion 11 along the first direction X. A recess 31 is located on the side of the connecting portion 332 closer to the main body portion 11 along the first direction X.

[0151] Optionally, the connecting part 332 and the supporting part 331 are integrally formed.

[0152] Optionally, the connecting part 332 is plate-shaped or sheet-shaped.

[0153] The two adjacent support parts 331 are connected by the connecting part 332 to form a whole. This is not only beneficial for assembly, but also helps to limit the displacement of the support part 331 along the third direction Z, thereby improving the stability of the support part 331. It also helps to control the distance between the two adjacent support parts 331, that is, to control the size of the recess 31 along the third direction Z, thereby reducing the risk of interference between the first electrode 12 and the support part 331 and damaging the first electrode 12.

[0154] The support portion 331 is closer to the main body portion 11 than the connecting portion 332. A recess 31 can be formed on the side of the connecting portion 332 facing the main body portion 11. The connecting portion 332 can insulate and isolate the first electrode tab 12 and the first end cap 32.

[0155] In some embodiments, along the third direction Z, the size of the second insulating member 50 is less than or equal to the size of the recess 31, and neither end of the second insulating member 50 extends beyond the recess 31 along the third direction Z. The first direction X, the second direction Y, and the third direction Z are perpendicular to each other.

[0156] Optionally, along the third direction Z, the second insulating member 50 is spaced apart from the support portion 331.

[0157] The second insulating member 50 extends beyond the recess 31 at both ends along the third direction Z, which helps to reduce interference between the second insulating member 50 and other structures, and lowers the risk of the edge of the second insulating member 50 warping or tearing under the interference of other structures. For example, the second insulating member 50 has a smaller dimension along the third direction Z, making it less likely to interfere with the support portion 331, and also less likely to interfere with the connection position between the first insulating member 40 and the support portion 331.

[0158] In some embodiments, refer to Figures 9 to 11 The first end cap assembly 30 includes a first end cap 32 and a third insulating member 33. Along the first direction X, at least a portion of the third insulating member 33 is disposed between the first end cap 32 and the main body portion 11. The second insulating member 50 includes a first insulating portion 51 and a second insulating portion 52. Along the second direction Y, at least a portion of the first insulating portion 51 is disposed between the electrode assembly 10 and the first housing wall 21. Along the first direction X, at least a portion of the second insulating portion 52 is disposed between the electrode assembly 10 and the first end cap 32.

[0159] Optionally, the first insulating part 51 and the second insulating part 52 are integrally formed.

[0160] Optionally, the second insulating portion 52 is connected to the first end cap assembly 30. The connection method between the second insulating portion 52 and the first end cap assembly 30 includes, but is not limited to, bonding or heat fusion.

[0161] Optionally, the first insulating portion 51 is connected to at least one of the main body portion 11, the first insulating member 40, and the first end cap assembly 30.

[0162] In one example, the second insulating member 50 is generally L-shaped. The second insulating member 50 includes a first insulating portion 51, which is disposed on either side of the first tab 12 along the first direction X, and the second insulating portion 52 is connected to the first insulating portion 51.

[0163] In another example, the second insulating member 50 is U-shaped. The second insulating member 50 includes two first insulating portions 51, which are respectively disposed on both sides of the first electrode tab 12 along the second direction Y, and the second insulating portion 52 connects the two first insulating portions 51.

[0164] In another example, the second insulating member 50 includes two first insulating portions 51 and two second insulating portions 52. The two first insulating portions 51 are respectively disposed on both sides of the first electrode tab 12 along the second direction Y, and the two second insulating portions 52 are spaced apart along the second direction Y and respectively connected to the two first insulating portions 51. The first insulating portions 51 and the second insulating portions 52 are connected to form an L-shaped structure.

[0165] The first insulating part 51 insulates and isolates the electrode assembly 10 and the first housing wall 21. The provision of the second insulating part 52 is beneficial to increasing the insulating area of ​​the second insulating member 50, and also beneficial to increasing the cooperation between the second insulating member 50 and other structures (such as the first end cap assembly 30), and facilitates the installation and fixation of the second insulating member 50.

[0166] In some embodiments, refer to Figure 10 The battery cell 6 includes an electrode terminal 61 and a first adapter 71. The electrode terminal 61 is disposed on the first end cap assembly 30, and the first adapter 71 is disposed on the side of the main body 11 near the first end cap assembly 30, and connects the first tab 12 and the electrode terminal 61. Along the first direction X, at least a portion of the second insulating portion 52 is disposed between the first adapter 71 and the third insulating portion 33.

[0167] The first adapter 71 is used to realize the electrical connection between the electrode terminal 61 and the first tab 12. Along the first direction X, the first adapter 71 is disposed between the electrode assembly 10 and the first end cap assembly 30.

[0168] The first electrode 12 is connected to the first adapter 71 by welding, bonding or other means. Exemplarily, the first electrode 12 and the first adapter 71 are laser welded.

[0169] Electrode terminal 61 is connected to first adapter 71 by welding, bonding or other means. Exemplarily, electrode terminal 61 and first adapter 71 are laser welded.

[0170] In one example, the second insulating portion 52 is connected to at least one of the first adapter 71 and the third insulating portion 33. Exemplarily, the second insulating portion 52 is bonded to either the first adapter 71 or the third insulating portion 33.

[0171] In another example, the second insulating portion 52 is not connected to the first adapter 71 and the third insulating portion 33. The second insulating portion 52 may contact or overlap with the first adapter 71.

[0172] In yet another example, the second insulating part 52 is sandwiched between the first adapter 71 and the third insulating part 33.

[0173] The second insulating part 52 is confined between the first adapter 71 and the third insulating part 33, which facilitates the arrangement of the second insulating part 52 using the gap between the first adapter 71 and the third insulating part 33, thereby improving space utilization.

[0174] In some embodiments, refer to Figure 10The electrode terminal 61 includes a first limiting portion 612. Along the first direction X, at least a portion of the first limiting portion 612 and the second insulating portion 52 are disposed between the third insulating member 33 and the first adapter 71. In the same plane perpendicular to the first direction X, the orthographic projections of the first limiting portion 612 and the second insulating portion 52 are spaced apart.

[0175] Optionally, the first limiting portion 612 surrounds the outer periphery of the second insulating portion 52.

[0176] The first limiting part 612 is located between the third insulating member 33 and the first adapter 71. Through the cooperation of the first limiting part 612 and the first end cap assembly 30, the risk of the electrode terminal 61 detaching from the first end cap assembly 30 is reduced. The second insulating part 52 is at least partially disposed between the third insulating member 33 and the first adapter 71, and does not overlap with the first limiting part 612. The space occupied by the first limiting part 612 in the first direction X can be used to arrange the second insulating part 52. In the first direction X, there is no thickness overlap between the first limiting part 612 and the second insulating part 52, which helps to improve space utilization and increase the energy density of the battery cell 6.

[0177] In some embodiments, the second insulating member 50 is fixed to the first end cap assembly 30.

[0178] At least one of the first insulating part 51 and the second insulating part 52 is fixed to the first end cap assembly 30.

[0179] The fixing methods between the second insulating member 50 and the first end cap assembly 30 include, but are not limited to, at least one of bonding, clamping, and heat fusion.

[0180] The fixed position of the second insulating member 50 relative to the first end cap assembly 30 helps to improve the accuracy of the relative position of the second insulating member 50 and the first electrode 12, reduce the displacement of the second insulating member 50, and improve the insulation and isolation effect.

[0181] In some embodiments, refer to Figure 11 At least a portion of the second insulating part 52 is sandwiched between the first end cap 32 and the third insulating member 33. This improves the installation stability of the second insulating member 50 and simplifies the assembly process of the second insulating part 52.

[0182] Before the first end cap 32 and the third insulating member 33 are connected, at least a portion of the second insulating part 52 is placed between the first end cap 32 and the third insulating member 33. After the first end cap 32 and the third insulating member 33 are connected, at least a portion of the second insulating part 52 is clamped by the first end cap 32 and the third insulating member 33, thereby fixing the second insulating part 52 and the first end cap assembly 30.

[0183] Optionally, the second insulating part 52 is bonded to one of the first end cap 32 and the third insulating member 33 to reduce the possibility of the second insulating part 52 shifting during the connection of the first end cap 32 and the third insulating member 33, thereby improving the positional accuracy of the second insulating part 52 relative to the first end cap assembly 30.

[0184] In some embodiments, refer to Figure 12 The battery cell 6 includes an electrode terminal 61, which is disposed on the first end cap assembly 30 and electrically connected to the first tab 12. Along the first direction X, a portion of the electrode terminal 61 is located on the side of the first end cap assembly 30 near the electrode assembly 10, and at least a portion of the second insulating portion 52 is sandwiched between the electrode terminal 61 and the third insulating member 33.

[0185] The first end cap assembly 30 is provided with an electrode lead-out hole, which extends through the first end cap assembly 30 along the first direction X. The electrode terminal 61 passes through the electrode lead-out hole. During assembly, after the electrode terminal 61 passes through the electrode lead-out hole, a portion of the electrode terminal 61 presses the second insulating part 52 against the third insulating member 33, thereby fixing the second insulating member 50 relative to the first end cap assembly 30.

[0186] Specifically, the electrode terminal 61 includes a terminal body 611 and a first limiting portion 612. At least a portion of the terminal body 611 is accommodated in an electrode lead-out hole, and the first limiting portion 612 protrudes from the outer peripheral surface of the terminal body 611. The first limiting portion 612 is located on the side of the first end cap assembly 30 near the main body 11. A portion of the second insulating portion 52 is sandwiched between the first limiting portion 612 and the third insulating member 33.

[0187] Optionally, the electrode terminal 61 includes a second limiting portion 613, which is disposed on the side of the first end cap assembly 30 away from the electrode assembly 10 along the first direction X. The second limiting portion 613 surrounds the outer periphery of the terminal body 611 and is connected to the terminal body 611.

[0188] Optionally, the second insulating portion 52 surrounds the outer periphery of the terminal body 611.

[0189] In this embodiment, the second insulating member 50 is fixed to the first end cap assembly 30 by assembling the electrode terminal 61 and the first end cap assembly 30, which helps to improve the stability of the second insulating member 50 and simplify the assembly process of the second insulating member 50.

[0190] In some embodiments, refer to Figure 7 The second insulating part 52 is provided with a limiting hole 521 extending through in the first direction X. The battery cell 6 includes an electrode terminal 61, which is disposed on the first end cap assembly 30 and electrically connected to the first tab 12. The electrode terminal 61 passes through the limiting hole 521.

[0191] In one example, the terminal body 611 passes through the limiting hole 521. The second insulating part 52 is held between the first end cap 32 and the third insulating member 33, or the second insulating part 52 is held between the first limiting part 612 and the third insulating member 33.

[0192] In another example, along the first direction X, a portion of the electrode terminal 61 is located on the side of the first end cap assembly 30 near the electrode assembly 10 and passes through the limiting hole 521. Exemplarily, a first limiting portion 612 passes through the limiting hole 521, and a second insulating portion 52 surrounds the outer periphery of the first limiting portion 612.

[0193] The electrode terminal 61 passes through the limiting hole 521. The second insulating part 50 can be positioned by the mutual cooperation between the second insulating part 52 and the electrode terminal 61, thereby reducing the risk of misalignment between the second insulating part 50 and the first electrode tab 12 and improving the insulation effect.

[0194] In some embodiments, refer to Figure 4 The second insulating member 50 includes two first insulating portions 51, which are spaced apart along a second direction Y. A second insulating portion 52 connects the two first insulating portions 51. Along the second direction Y, at least a portion of one of the first insulating portions 51 is disposed between the first tab 12 and one of the first housing walls 21, and at least a portion of the other first insulating portion 51 is disposed between the first tab 12 and the other first housing wall 21.

[0195] The second insulating component 50 is U-shaped overall.

[0196] The two first insulating parts 51 respectively insulate and isolate the first tab 12 and the two first shell walls 21 on both sides of the second direction Y, which helps to reduce the risk of short circuit caused by the first tab 12 overlapping with either of the first shell walls 21 or corrosion of the shell 20.

[0197] The second insulating part 52 connects the two first insulating parts 51, which simplifies the structure of the second insulating member 50 and facilitates tensioning of the entire second insulating member 50, thereby improving the insulation effect of the second insulating member 50. For example, the second insulating member 50 is tensioned by connecting the two first insulating parts 51 to the main body 11 or the first insulating member 40. The side of the first insulating part 51 near the first end cap assembly 30 along the first direction X does not need to be connected or fixed to other structures, and the second insulating part 52 also does not need to be connected or fixed to other structures.

[0198] In some embodiments, refer to Figure 6 In the same plane perpendicular to the second direction Y, the orthographic projection of the second insulating member 50 overlaps with the orthographic projection of the main body 11.

[0199] The second insulating member 50 includes a first insulating portion 51, which is stacked with the first insulating member 40 along the second direction Y. A portion of the first insulating portion 51 is located between the first housing wall 21 and the first tab 12, and another portion of the first insulating portion 51 is located between the first housing wall 21 and the main body portion 11.

[0200] Along the second direction Y, the second insulating member 50 partially overlaps with the main body 11, which helps to increase the size of the second insulating member 50 along the first direction X and reduce the risk of insulation failure caused by the edge of the second insulating member 50 lifting or tearing; it also helps to increase the connection points between the second insulating member 50 and other structures. For example, the second insulating member 50 can be connected to the main body 11, which improves the firmness of the second insulating member 50.

[0201] In some embodiments, refer to Figure 6 The dimension of the portion of the second insulating member 50 that overlaps with the main body 11 along the first direction X is L1, and the dimension of the main body 11 along the first direction X is L2. L1 ≥ 5 mm, and L1 / L2 ≤ 0.5.

[0202] Optionally, L1 / L2 is 0.1, 0.15, 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, 0.5 or any two of these values.

[0203] In this embodiment, L1 is set to be greater than or equal to 5mm. The portion of the second insulating member 50 overlapping with the main body 11 has a larger dimension along the first direction X, which helps reduce the risk of insulation failure caused by edge warping or tearing of the second insulating member 50. In this embodiment, L1 / L2 is set to be less than or equal to 0.5, which helps limit the dimension of the portion of the second insulating member 50 overlapping with the main body 11 along the first direction X, reduces interference between the second insulating member 50 and other structures during assembly, and reduces assembly difficulty; it also helps reduce the probability of wrinkles forming in the portion of the second insulating member 50 overlapping with the main body 11, improves the flatness of the second insulating member 50, and reduces the space occupied by the second insulating member 50.

[0204] In some embodiments, refer to Figure 6 , Figures 9 to 12 The battery cell 6 includes an electrode terminal 61 and a first adapter 71. The electrode terminal 61 is disposed on the first end cap assembly 30. Along the first direction X, the first adapter 71 is disposed between the main body 11 and the first end cap assembly 30, and the first adapter 71 connects the first tab 12 and the electrode terminal 61. Along the second direction Y, a portion of the second insulating member 50 and a portion of the first insulating member 40 are stacked between the first adapter 71 and the first shell wall 21.

[0205] In one example, along the first direction X, the first tab 12 is located entirely between the first adapter 71 and the main body 11.

[0206] In another example, along the first direction X, a portion of the first tab 12 is located between the first adapter 71 and the first end cap assembly 30.

[0207] Along the direction from the main body 11 toward the first end cap assembly 30, a portion of the first insulating member 40 extends beyond the main body 11. The portion of the first insulating member 40 extending beyond the main body 11 is located between the first housing wall 21 and the first adapter 71 along the second direction Y, thereby insulating and isolating the first housing wall 21 and the first adapter 71.

[0208] Along the second direction Y, a portion of the second insulating member 50 is disposed between the first housing wall 21 and the first adapter 71, thereby insulating and isolating the first housing wall 21 and the first adapter 71.

[0209] Both the first insulating member 40 and the second insulating member 50 can prevent the first adapter 71 from overlapping with the first housing wall 21. A portion of the first insulating member 40 and at least a portion of the second insulating member 50 are stacked between the first housing wall 21 and the first adapter 71, forming a double-layer insulation barrier between the first housing wall 21 and the first adapter 71. This helps to reduce the risk of the first housing wall 21 and the first adapter 71 overlapping due to warping, wrinkling, or damage of either the first insulating member 40 or the second insulating member 50, thereby improving the reliability of the battery cell 6.

[0210] In some embodiments, along the third direction Z, the size of the second insulating member 50 is greater than or equal to the size of the first adapter 71, and the two ends of the first adapter 71 along the third direction Z do not extend beyond the second insulating member 50, and the first direction X, the second direction Y and the third direction Z are perpendicular to each other.

[0211] The second insulating member 50 can prevent the first adapter 71 from overlapping with the first shell wall 21 in any area of ​​the third direction Z, thereby improving the insulation and isolation effect of the second insulating member 50 on the first adapter 71 and the first shell wall 21.

[0212] In some embodiments, in the same plane perpendicular to the second direction Y, the orthographic projection of the first adapter 71 lies within the orthographic projection of the second insulator 50.

[0213] Along the second direction Y, the second insulating member 50 can completely cover the first adapter 71, preventing any area of ​​the first adapter 71 from overlapping with the first shell wall 21, thereby improving the insulation and isolation effect of the second insulating member 50 on the first adapter 71 and the first shell wall 21.

[0214] In some embodiments, along the second direction Y, the total thickness of the stacked portion of the first insulating member 40 and the second insulating member 50 is greater than or equal to 0.15 mm. This helps to reduce the risk of the first insulating member 40 and the second insulating member 50 being punctured by metal particles or burrs, thereby improving the insulation effect.

[0215] Optionally, the total thickness of the stacked portion of the first insulating member 40 and the second insulating member 50 is 0.15mm-0.5mm. Exemplarily, the total thickness of the stacked portion of the first insulating member 40 and the second insulating member 50 is 0.15mm, 0.16mm, 0.17mm, 0.18mm, 0.19mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, or any value between any two of these.

[0216] In some embodiments, refer to Figures 10 to 12 Along the second direction Y, at least a portion of the second insulating member 50 is located between the first insulating member 40 and the first tab 12.

[0217] The second insulating member 50 includes a first insulating portion 51, which is stacked with the first insulating member 40 along the second direction Y. Along the second direction Y, the first insulating portion 51 is located on the side of the first insulating member 40 closest to the electrode assembly 10.

[0218] In one example, along the second direction Y, the first insulating portion 51 does not overlap with the main body portion 11. The first insulating portion 51 is connected to the third insulating member 33, for example, the first insulating portion 51 is connected to the support portion 331.

[0219] In another example, along the second direction Y, a portion of the first insulating portion 51 is located between the first tab 12 and the first insulating member 40, and another portion of the first insulating portion 51 is located between the main body portion 11 and the first insulating member 40.

[0220] During assembly, the second insulating member 50, the first end cap assembly 30 and the electrode assembly 10 are first assembled together, and then the first insulating member 40 is wrapped around the outside of the main body 11, with a portion of the first insulating member 40 covering at least a portion of the outside of the second insulating member 50.

[0221] At least a portion of the second insulating member 50 is located on the side of the first insulating member 40 facing the first electrode 12. This helps to reduce interference between the first insulating member 40 and the second insulating member 50 during the process of the first insulating member 40 covering the main body 11. It also helps to determine the relative position between the second insulating member 50 and the first electrode 12 before the first insulating member 40 covers the main body 11, thereby improving the insulation and isolation effect of the second insulating member 50.

[0222] In some embodiments, refer to Figures 10 to 12Along the second direction Y, a portion of the second insulating member 50 is disposed between the main body portion 11 and the first insulating member 40, and is connected to at least one of the main body portion 11 and the first insulating member 40. The main body portion 11 and the first insulating member 40 can provide a large surface area for connection with the second insulating member 50, which is beneficial to improving the robustness and stability of the second insulating member 50.

[0223] The second insulating member 50 includes a first insulating portion 51, which is stacked with the first insulating member 40 along the second direction Y. A portion of the first insulating portion 51 is located between the first tab 12 and the first insulating member 40, and another portion of the first insulating portion 51 is located between the main body portion 11 and the first insulating member 40. The portion of the first insulating portion 51 located between the main body portion 11 and the first insulating member 40 is connected to at least one of the main body portion 11 and the first insulating member 40.

[0224] The connection between the second insulating member 50 and the main body 11 includes, but is not limited to, adhesive bonding. The connection between the second insulating member 50 and the first insulating member 40 includes, but is not limited to, adhesive bonding.

[0225] In some embodiments, refer to Figure 6 and Figure 7 The battery cell 6 includes an adhesive member 80, which is adhered to the main body 11 and to the portion of the second insulating member 50 located between the main body 11 and the first insulating member 40.

[0226] Optionally, a portion of the first insulating portion 51 is located between the main body portion 11 and the first insulating member 40. The adhesive member 80 is bonded to the surface of the first insulating portion 51 facing away from the main body portion 11 and to the surface of the main body portion 11.

[0227] By bonding the main body 11 and the second insulating member 50 with the adhesive member 80, the second insulating member 50 can be fixed. Furthermore, the second insulating member 50 itself does not need to have an adhesive layer, which helps to reduce impurities such as dust or particulate matter adhering to the surface of the second insulating member 50 and reduces the risk of the second insulating member 50 and the first insulating member 40 being worn or punctured by impurities.

[0228] In some embodiments, refer to Figure 13 A portion of the second insulating member 50 is disposed on the side of the first insulating member 40 away from the electrode assembly 10 along the second direction Y, and is connected to the first insulating member 40. In this way, the second insulating member 50 provides a certain degree of protection to the first insulating member 40, which helps to reduce the phenomenon of the first insulating member 40 warping or breaking.

[0229] Optionally, the first insulating portion 51 is located between the first housing wall 21 and the first insulating member 40.

[0230] Optionally, the second insulating member 50 may be attached to the surface of the first insulating member 40 facing away from the electrode assembly 10 by adhesive bonding or other means.

[0231] During assembly, the first insulating member 40 is first wrapped around the outside of the main body 11, and then a portion of the second insulating member 50 is covered on the side of the first insulating member 40 facing away from the electrode assembly 10.

[0232] In some embodiments, the material of the second insulating member 50 includes polyethylene terephthalate and / or polyimide.

[0233] Polyethylene terephthalate and / or polyimide have high tensile strength and elastic modulus, strong puncture resistance, and are also beneficial in resisting the mechanical impact caused by the expansion and contraction of the electrode assembly 10, reducing the risk of the second insulating component 50 breaking.

[0234] Polyethylene terephthalate and / or polyimide have good electrical insulation and chemical stability, which helps to reduce the risk of the second insulating component 50 being corroded by the electrolyte and improve the insulation effect.

[0235] In some embodiments, refer to Figure 9 The electrode assembly 10 includes a second electrode tab 13, and the first electrode tab 12 and the second electrode tab 13 have opposite polarities. The second electrode tab 13 is connected to the main body 11 and electrically connected to the housing 20.

[0236] Optionally, the first electrode 12 is the negative electrode and the second electrode 13 is the positive electrode.

[0237] In one example, the second tab 13 is directly connected to the housing 20. Exemplarily, the second tab 13 is welded to one of the shell walls of the housing 20.

[0238] In another example, the second tab 13 is indirectly connected to the housing 20 via a conductive structure. Optionally, the conductive structure includes at least one of an adapter and an end cap.

[0239] The second tab 13 is electrically connected to the housing 20, which is energized. If the first tab 12 and the housing 20 come into contact, it will cause a short circuit. The first insulating member 40 and the second insulating member 50 form a double-layer insulation between the first housing wall 21 and the first tab 12, which helps to prevent the first tab 12 and the first housing wall 21 from coming into contact and reduces the risk of short circuit.

[0240] In some embodiments, refer to Figure 4The housing 20 has a second opening 20b, and the second opening 20b and the first opening 20a are disposed opposite to each other along a first direction X. The battery cell 6 includes a second end cap assembly 90, which includes a second end cap 91. The second end cap 91 is connected to the housing 20 and covers the second opening 20b. The second electrode tab 13 is electrically connected to the second end cap 91.

[0241] The second end cap assembly 90 includes a fourth insulating member 92 disposed between the second end cap 91 and the main body 11 along the first direction X.

[0242] In one example, the second tab 13 is directly connected to the second end cap 91. A portion of the second tab 13 passes through the fourth insulator 92 and is soldered to the second end cap 91. The second tab 13 can be soldered to the second end cap 91 on the side of the second end cap 91 closer to the body portion 11, or it can pass through the second end cap 91 and be soldered to the second end cap 91 on the side of the second end cap 91 away from the body portion 11.

[0243] In another example, the second tab 13 is indirectly connected to the second end cap 91.

[0244] The second tab 13 is electrically connected to the second end cap 91, which can serve as another electrode terminal, thus saving the need for additional electrode terminals and simplifying the structure of the battery cell 6.

[0245] In some embodiments, the second end cap 91 is provided with a first through hole 911. The second tab 13 is housed within the housing 20, and the battery cell 6 includes a second adapter 72, which connects to the second tab 13 and passes through the first through hole 911. Along the first direction X, a portion of the second adapter 72 is located on the side of the second end cap 91 away from the main body 11 and is welded to the second end cap 91.

[0246] The second adapter 72 is welded to the second end cap 91 on the side of the second end cap 91 away from the main body 11, which helps to reduce the probability of welding particles falling into the housing 20 and reduce the risk of internal short circuit in the battery cell 6; it also helps to reduce the adverse effects of welding heat on the solder marks of the second tab 13 and the second adapter 72.

[0247] In some embodiments, the second end cap assembly 90 includes a cover 93 connected to the second end cap 91 and covering the first through hole 911 to prevent external impurities from entering the housing 20 through the first through hole 911.

[0248] Optionally, the cover 93 covers the welded portion between the second end cap 91 and the second adapter 72 along the first direction X.

[0249] Optionally, the cover 93 is a conductive component, electrically connected to the second end cap 91, and used for connection to the busbar component. The cover 93 can also serve as another electrode terminal for connection to an external circuit.

[0250] According to a second aspect of this application, embodiments of this application also provide a battery device 2, referring to... Figure 2 The battery device 2 includes a battery cell 6 provided according to any embodiment of the first aspect of this application.

[0251] According to a third aspect of this application, embodiments of this application also provide an electrical device, which includes a battery device 2 provided according to any embodiment of the second aspect of this application, the battery device 2 being used to provide electrical energy.

[0252] This application provides a battery cell 6, which includes an electrode assembly 10, a housing 20, a first end cap assembly 30, a first insulating member 40, and a second insulating member 50. The housing 20 has a first opening 20a on one side along a first direction X. The housing 20 includes two first housing walls 21 spaced apart along a second direction Y. The first end cap assembly 30 is connected to the housing 20 and covers the first opening 20a. The electrode assembly 10 includes a main body 11 and a first tab 12. The main body 11 is housed in the housing 20, and the first tab 12 is connected to the main body 11. Along the first direction X, at least a portion of the first tab 12 is located between the first end cap assembly 30 and the main body 11. The second direction Y is parallel to the thickness direction of the electrode assembly 10. The first insulating member 40 covers at least a portion of the outer side of the main body 11 and is connected to the first end cap assembly 30. The second insulating member 50 includes two first insulating portions 51 and a second insulating portion 52 connecting the two first insulating portions 51. Two first insulating portions 51 are respectively disposed on both sides of the electrode assembly 10 along the second direction Y. At least a portion of the first insulating portion 51 and a portion of the first insulating member 40 are stacked between the first housing wall 21 and the first tab 12. Along the first direction X, at least a portion of the second insulating portion 52 is disposed between the electrode assembly 10 and the first end cap assembly 30. Along the third direction Z, the size of the second insulating member 50 is greater than or equal to the size of the first tab 12, and the two ends of the first tab 12 along the third direction Z do not extend beyond the second insulating member 50. The first direction X, the second direction Y, and the third direction Z are perpendicular to each other. Along the second direction Y, the first insulating portion 51 is located between the first insulating member 40 and the electrode assembly 10 and is connected to the main body portion 11.

[0253] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. 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 housing has a first opening on one side along a first direction, and the housing includes two first shell walls spaced apart along a second direction, the second direction being perpendicular to the first direction; A first end cap assembly is connected to the housing and covers the first opening; An electrode assembly includes a main body and a first tab. The main body is housed in a housing, and the first tab is connected to the main body. At least a portion of the first tab is located between a first end cap assembly and the main body along a first direction, and a second direction is parallel to the thickness direction of the electrode assembly. Along the first direction, the first end cap assembly has a recess on the side facing the main body, and the recess extends through the first end cap assembly along the second direction. The first tab is at least partially housed in the recess. A first insulating element covers at least a portion of the outer side of the main body and is connected to the first end cap assembly; as well as A second insulating member, along the second direction, wherein at least a portion of the second insulating member and a portion of the first insulating member are stacked between the first housing wall and the first tab.

2. The battery cell according to claim 1, characterized in that, Along the third direction, the size of the second insulating member is greater than or equal to the size of the first electrode tab, and the two ends of the first electrode tab along the third direction do not extend beyond the second insulating member; The first direction, the second direction, and the third direction are perpendicular to each other.

3. The battery cell according to claim 1 or 2, characterized in that, In the same plane perpendicular to the second direction, the orthographic projection of the first electrode lies within the orthographic projection of the second insulating member.

4. The battery cell according to claim 1, characterized in that, Along a third direction, at least one end of the second insulating member extends beyond the first tab, the first direction, the second direction, and the third direction are perpendicular to each other, and the dimension by which the second insulating member extends beyond the first tab along the third direction is greater than or equal to 1 mm.

5. The battery cell according to claim 1, characterized in that, The first end cap assembly includes a first end cap and a third insulating member, wherein at least a portion of the third insulating member is disposed between the first end cap and the main body portion along the first direction; The recess extends through the third insulating member along the second direction, and the first insulating member is connected to the third insulating member.

6. The battery cell according to claim 5, characterized in that, The third insulating member includes at least two support portions spaced apart along a third direction, the support portions being used to abut against the main body portion, the first direction, the second direction and the third direction being perpendicular to each other; Along the third direction, the recess is located between two adjacent support portions, and the first insulating member is connected to the support portion.

7. The battery cell according to claim 6, characterized in that, The third insulating member includes a connecting portion that connects two adjacent support portions. Along the first direction, at least a portion of the support portion protrudes from a first surface of the connecting portion facing the main body portion, and the recess is located on the side of the connecting portion closer to the main body portion along the first direction.

8. The battery cell according to claim 1, characterized in that, Along the third direction, the size of the second insulating member is less than or equal to the size of the recess, and the two ends of the second insulating member along the third direction do not exceed the recess, and the first direction, the second direction and the third direction are perpendicular to each other.

9. The battery cell according to claim 1, characterized in that, The first end cap assembly includes a first end cap and a third insulating member, wherein at least a portion of the third insulating member is disposed between the first end cap and the main body portion along the first direction; The second insulating member includes a first insulating portion and a second insulating portion. Along the second direction, at least a portion of the first insulating portion is disposed between the electrode assembly and the first housing wall, and along the first direction, at least a portion of the second insulating portion is disposed between the electrode assembly and the first end cap.

10. The battery cell according to claim 9, characterized in that, The battery cell includes an electrode terminal and a first adapter. The electrode terminal is disposed on the first end cap assembly, and the first adapter is disposed on the side of the main body near the first end cap assembly and connects the first tab and the electrode terminal. Along the first direction, at least a portion of the second insulating portion is disposed between the first adapter and the third insulating portion.

11. The battery cell according to claim 10, characterized in that, The electrode terminal includes a first limiting portion. Along the first direction, at least a portion of the first limiting portion and the second insulating portion are disposed between the third insulating member and the first adapter. In the same plane perpendicular to the first direction, the orthographic projections of the first limiting portion and the second insulating portion are spaced apart.

12. The battery cell according to claim 9, characterized in that, The second insulating element is fixed to the first end cap assembly.

13. The battery cell according to claim 12, characterized in that, At least a portion of the second insulating portion is sandwiched between the first end cap and the third insulating member.

14. The battery cell according to claim 12, characterized in that, The battery cell includes an electrode terminal disposed on the first end cap assembly and electrically connected to the first tab; along the first direction, a portion of the electrode terminal is located on the side of the first end cap assembly closer to the electrode assembly, and at least a portion of the second insulating portion is sandwiched between the electrode terminal and the third insulating member.

15. The battery cell according to claim 9, characterized in that, The second insulating part is provided with a limiting hole that extends through the first direction; The battery cell includes an electrode terminal, which is disposed on the first end cap assembly and electrically connected to the first tab, and the electrode terminal passes through the limiting hole.

16. The battery cell according to claim 9, characterized in that, The second insulating member includes two first insulating portions, which are spaced apart along the second direction, and the second insulating portion connects the two first insulating portions; Along the second direction, at least a portion of one of the first insulating portions is disposed between the first tab and one of the first housing walls, and at least a portion of the other first insulating portion is disposed between the first tab and the other first housing wall.

17. The battery cell according to claim 1, characterized in that, In the same plane perpendicular to the second direction, the orthographic projection of the second insulating member overlaps with the orthographic projection of the main body.

18. The battery cell according to claim 17, characterized in that, The dimension of the portion of the second insulating member that overlaps with the main body along the first direction is L1, and the dimension of the main body along the first direction is L2, where L1 ≥ 5 mm and L1 / L2 ≤ 0.

5.

19. The battery cell according to claim 1, characterized in that, The battery cell includes an electrode terminal and a first adapter. The electrode terminal is disposed on the first end cap assembly. Along the first direction, the first adapter is disposed between the main body and the first end cap assembly. The first adapter connects the first tab and the electrode terminal. Along the second direction, a portion of the second insulating member and a portion of the first insulating member are stacked between the first adapter and the first shell wall.

20. The battery cell according to claim 19, characterized in that, Along the third direction, the size of the second insulating member is greater than or equal to the size of the first adapter member, and the two ends of the first adapter member along the third direction do not extend beyond the second insulating member; The first direction, the second direction, and the third direction are perpendicular to each other.

21. The battery cell according to claim 19 or 20, characterized in that, In the same plane perpendicular to the second direction, the orthographic projection of the first adapter lies within the orthographic projection of the second insulator.

22. The battery cell according to claim 1, characterized in that, Along the second direction, the total thickness of the stacked portion of the first insulating element and the second insulating element is greater than or equal to 0.15 mm.

23. The battery cell according to claim 1, characterized in that, Along the second direction, at least a portion of the second insulating member is located between the first insulating member and the first tab.

24. The battery cell according to claim 23, characterized in that, Along the second direction, a portion of the second insulating member is disposed between the main body and the first insulating member, and is connected to at least one of the main body and the first insulating member.

25. The battery cell according to claim 24, characterized in that, The battery cell includes an adhesive component, which is adhered to the main body portion and to the portion of the second insulating component located between the main body portion and the first insulating component.

26. The battery cell according to claim 1, characterized in that, A portion of the second insulating member is disposed on the side of the first insulating member away from the electrode assembly along the second direction and is connected to the first insulating member.

27. The battery cell according to claim 1, characterized in that, The material of the second insulating element includes polyethylene terephthalate and / or polyimide.

28. The battery cell according to claim 1, characterized in that, The electrode assembly includes a second tab, the first tab and the second tab having opposite polarities, the second tab being connected to the main body and electrically connected to the housing.

29. The battery cell according to claim 28, characterized in that, The housing has a second opening, and the second opening and the first opening are disposed opposite to each other along the first direction; The battery cell includes a second end cap assembly, the second end cap assembly includes a second end cap, the second end cap is connected to the housing and covers the second opening, and the second electrode tab is electrically connected to the second end cap.

30. The battery cell according to claim 29, characterized in that, The second end cap is provided with a first through hole; The second tab is housed within the housing. The battery cell includes a second adapter, which connects to the second tab and passes through the first through hole. Along the first direction, a portion of the second adapter is located on the side of the second end cap away from the main body and is welded to the second end cap.

31. A battery device, characterized in that, It includes multiple battery cells according to any one of claims 1-30.

32. An electrical appliance, characterized in that, Includes the battery device according to claim 31, the battery device being used to provide electrical energy.

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