Battery cell, battery device and electric device

Abstract

A battery cell, a battery device and an electric device. The battery cell comprises a casing, electrode terminals, an electrode assembly, a first insulating member, adapter pieces and second insulating members. The casing comprises a first wall, the electrode terminals being disposed on the first wall. The electrode assembly is accommodated in the casing, and comprises an electrode body and tabs, the tabs being led out from the electrode body towards a first end face of the first wall. The first insulating member is disposed on the side of the first wall facing the electrode assembly. The adapter pieces connect the electrode terminals and the tabs; and in the direction of thickness of the first wall, at least part of the first insulating member is disposed between the first wall and the adapter pieces. In the direction of thickness of the first wall, at least part of the second insulating members are disposed between the adapter pieces and the electrode body, and the tabs are connected to the areas of the adapter pieces that do not overlap the second insulating members in the direction of thickness.

Description

Battery cells, battery packs and electrical devices

[0001] Cross-references to related applications

[0002] This application claims priority to Chinese Patent Application No. 202422668011.9, filed on November 1, 2024, entitled “Battery Cell, Battery Device and Power Consumption Device”, the entire contents of which are incorporated herein by reference. Technical Field

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

[0004] With the development of new energy technologies, batteries are being used more and more widely, for example in mobile phones, laptops, electric vehicles, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes, and power tools.

[0005] In the development of battery technology, the reliability of individual battery cells directly affects the reliability, cost of use, and user experience of end products. Therefore, how to effectively improve the reliability of individual battery cells is a continuous technical challenge in battery technology. Summary of the Invention

[0006] In view of the above problems, this application provides a battery cell, a battery device, and an electrical device, which can effectively improve the reliability of the battery cell.

[0007] In a first aspect, embodiments of this application provide a battery cell, which includes a casing, electrode terminals, an electrode assembly, a first insulating member, an adapter plate, and a second insulating member. The casing includes a first wall, and the electrode terminals are disposed on the first wall. The electrode assembly is housed within the casing and includes an electrode body and a tab, with the tab extending from a first end face of the electrode body towards the first wall. The first insulating member is disposed on the side of the first wall facing the electrode assembly. The adapter plate connects the electrode terminals and the tab, and at least a portion of the first insulating member is disposed between the first wall and the adapter plate in the thickness direction of the first wall. At least a portion of the second insulating member is disposed between the adapter plate and the electrode body in the thickness direction of the first wall, and the tab connects to an area of ​​the adapter plate that does not overlap with the second insulating member in the thickness direction.

[0008] The above technical solution provides a second insulating element between the adapter plate and the electrode body. This second insulating element can also create a gap between the adapter plate and the electrode body, thereby insulating the adapter plate from the electrode body and reducing the risk of short circuit caused by contact between the adapter plate and the electrode body. This effectively improves the reliability of the battery cell.

[0009] In some embodiments of the first aspect, the second insulating element is disposed in at least one of the first insulating element and the adapter piece.

[0010] The above technical solution can reduce the difficulty of preparing the second insulating component, simplify the preparation process, and help reduce the overall production cost of the battery cell.

[0011] In some embodiments of the first aspect, the first insulating member includes a first main body portion and a protrusion, the protrusion protruding from the side surface of the first main body portion facing the electrode body, and at least a portion of the first main body portion is disposed between the first wall and the adapter piece. In the thickness direction, the distance between the side surface of the protrusion facing the electrode body and the first end face is less than or equal to the distance between the side surface of the second insulating member facing the electrode body and the first end face.

[0012] The above technical solution can reduce the space occupied by the second insulating component in the internal space of the battery cell, which is beneficial to improving the energy density of the battery cell.

[0013] In some embodiments of the first aspect, the surface of the protrusion facing the electrode body is flush with the surface of the second insulating member facing the electrode body.

[0014] It can effectively improve the utilization rate of the internal space of the battery cell and the consistency of the internal structure of the battery cell.

[0015] In some embodiments of the first aspect, the second insulating member and the first insulating member are integrally formed, at least a portion of the second insulating member is located on the side of the first insulating member facing the electrode assembly, and a slot is formed between the second insulating member and the first insulating member, and a portion of the adapter piece is inserted into the slot.

[0016] The second insulating component of the above-mentioned technical solution is integrally formed with the first insulating component, resulting in a simple structure that simplifies the manufacturing process and reduces costs. Furthermore, the integral forming of the second and first insulating components helps improve the flatness between the surface of the protrusion facing the electrode body and the surface of the second insulating component facing the electrode body.

[0017] In some embodiments of the first aspect, a recess is provided on the second insulating member, the recess being recessed relative to the side surface of the second insulating member in the thickness direction and facing the first insulating member, the recess and the side surface of the first insulating member facing the electrode assembly together defining a slot.

[0018] The introduction of the recess increases the internal space of the slot, making it easier to insert the adapter piece, thereby reducing the assembly difficulty of the adapter piece.

[0019] In some embodiments of the first aspect, a first clearance hole is provided on the second insulating member, the first clearance hole penetrating the second insulating member along the thickness direction. A terminal connector is provided on the adapter piece, the terminal connector protruding from the side surface of the adapter piece facing the first wall and connected to the electrode terminal, the projection of the terminal connector along the thickness direction being located within the projection of the first clearance hole along the thickness direction.

[0020] The above technical solution introduces a first clearance hole, which facilitates the welding operation between the terminal connector and the electrode terminal, thereby reducing the connection difficulty between the terminal connector and the electrode terminal and improving production efficiency.

[0021] In some embodiments of the first aspect, the second insulating member and the first insulating member are formed independently, and the second insulating member is disposed on the first insulating member.

[0022] The above technical solutions can not only reduce the difficulty of manufacturing battery cells, but also improve the overall design flexibility of battery cells.

[0023] In some embodiments of the first aspect, a plug-in portion is provided on the second insulating member, and a plug-in mating portion adapted to the plug-in portion is provided on the first insulating member, wherein the plug-in portion and the plug-in mating portion are plugged in and fixed.

[0024] The first and second insulating components of the above technical solution are inserted and fixed, which reduces the assembly difficulty and helps to improve the overall assembly efficiency of the battery cell.

[0025] In some embodiments of the first aspect, the first insulating member includes a first main body portion and a protrusion. The protrusion protrudes from the side surface of the first main body portion facing the electrode body and abuts against a first end face. At least a portion of the first main body portion is disposed between the first wall and the adapter piece. The second insulating member includes a second main body portion and a fixing portion. The fixing portion is connected to the second main body portion and protrudes from the side surface of the second main body portion facing the first wall. At least a portion of the second main body portion is disposed between the adapter piece and the electrode body. A plug-in portion is disposed on the fixing portion, and a plug-in mating portion is disposed on the first main body portion.

[0026] The above technical solution can effectively reduce the assembly difficulty of the adapter piece and improve the production efficiency and quality of the battery cell.

[0027] In some embodiments of the first aspect, the adapter includes a first connecting portion and a second connecting portion, the first connecting portion being connected to an electrode terminal and the second connecting portion being connected to an electrode tab, the first connecting portion and the second connecting portion being disposed along a first direction. The second insulating member includes two fixing portions, the two fixing portions being respectively connected to both ends of the second main body portion along a second direction, the first direction, the second direction and the thickness direction being perpendicular to each other.

[0028] The above technical solution, by providing two fixing parts, can further improve the connection firmness of the second insulating member. Furthermore, by connecting the two fixing parts to the two ends of the second main body along the second direction, after the second insulating member is assembled with the first insulating member, the risk of interference between the fixing parts and the second connecting part, leading to connection failure between the second connecting part and the electrode tab, can be reduced.

[0029] In some embodiments of the first aspect, the second insulating member is movably connected to the first insulating member so that the second insulating member can cover or avoid the adapter piece.

[0030] The above technical solution can reduce the assembly difficulty of the adapter piece while improving the integration of the first and second insulating components.

[0031] In some embodiments of the first aspect, the second insulating member is rotatably connected to the first insulating member.

[0032] The second insulating component is rotatably connected to the first insulating component. The structure is relatively simple and the installation is less difficult, which helps to reduce the overall cost of the battery cell.

[0033] In some embodiments of the first aspect, the first insulating member includes a first main body portion and a protrusion. The protrusion protrudes from the surface of the first main body portion facing the electrode body and abuts against a first end face. At least a portion of the first main body portion is disposed between the first wall and the adapter piece. The protrusion and the second insulating member are disposed along a first direction, and the second insulating member is located on the side of the protrusion closer to the adapter piece. The second insulating member is rotatably connected to the protrusion, and the axis of rotation of the second insulating member is parallel to the first direction, which intersects the thickness direction.

[0034] The above technical solution can not only reduce the impact of the protrusion on the rotation of the second insulating component, but also reduce the difficulty of setting the second insulating component.

[0035] In some embodiments of the first aspect, the second insulating member is provided with a snap-fit ​​portion, and the protrusion is provided with a snap-fit ​​mating portion adapted to the snap-fit ​​portion. The snap-fit ​​portion is used to snap into the snap-fit ​​mating portion to fix the first insulating member and the second insulating member.

[0036] The above technical solution can improve the stability of the second insulating component in the battery cell, thereby reducing the risk of insulation failure caused by the movement of the second insulating component.

[0037] In some embodiments of the first aspect, the second insulating member includes a first portion and a second portion, the first portion and the second portion being spaced apart and disposed opposite to each other along a second direction, the first portion and the second portion being rotatably connected to the protrusion, and the first direction, the second direction and the thickness direction being perpendicular to each other.

[0038] The first and second parts of the above technical solution can rotate independently of each other, which can further improve the flexibility of the adapter assembly process.

[0039] In some embodiments of the first aspect, the second insulating member and the first insulating member are formed independently, and the second insulating member is disposed on the adapter piece.

[0040] The adapter plate has a relatively simple structure, and the difficulty of placing the second insulating component on the first insulating component is also relatively low. Furthermore, the second insulating component needs to cover a portion of the adapter plate, and certain positioning operations are required during the placement of the second insulating component and the adapter plate. Therefore, placing the second insulating component on the adapter plate can also reduce the difficulty of positioning the second insulating component and the adapter plate.

[0041] In some embodiments of the first aspect, the second insulating element covers a portion of the adapter piece.

[0042] The second insulating component of the above-mentioned technical solution is disposed on the adapter piece in the form of a cover, which can not only improve the stability of the second insulating component, but also reduce the overall assembly complexity of the battery cell.

[0043] In some embodiments of the first aspect, a second clearance hole is provided on the second insulating member, and the second clearance hole penetrates the second insulating member along the thickness direction of the first insulating member. A terminal connector is provided on the adapter piece, the terminal connector protruding from the side surface of the adapter piece facing the first wall and connected to the electrode terminal, and the projection of the terminal connector along the thickness direction is located within the projection of the second clearance hole along the thickness direction.

[0044] The above technical solution introduces a second clearance hole, which facilitates the welding operation between the terminal connector and the electrode terminal, thereby reducing the connection difficulty between the terminal connector and the electrode terminal and improving production efficiency.

[0045] In some embodiments of the first aspect, the second insulating element is attached to the side surface of the adapter plate facing the electrode body.

[0046] The above technical solution can reduce the difficulty of manufacturing the second insulating component, simplify the manufacturing process, improve the assembly efficiency of the second insulating component, and help reduce the overall production cost of the battery cell.

[0047] In some embodiments of the first aspect, the melting point of the second insulating element is greater than that of the first insulating element.

[0048] The above technical solution provides a second insulating component with a high melting point between the electrode body and the adapter plate. When the battery cell is heated, the second insulating component is less likely to melt. Even if the first insulating component softens and the supporting force decreases, the second insulating component can still create a gap between the adapter plate and the electrode body to insulate the adapter plate from the electrode body, thereby further improving the reliability of the battery cell.

[0049] In some embodiments of the first aspect, the electrode body includes two first surfaces and two second surfaces, the two first surfaces being disposed opposite to each other along a first direction, and the two second surfaces being disposed opposite to each other along a second direction. The area of ​​the second surfaces is larger than the area of ​​the first surfaces, and the first direction, the second direction, and the thickness direction are mutually perpendicular. A portion of the second insulating member located between the adapter piece and the electrode body in the thickness direction extends along the second direction. In the second direction, the second insulating member extends beyond the two side edges of the adapter piece along the second direction, or the two side edges of the second insulating member along the second direction are flush with the two side edges of the adapter piece along the second direction.

[0050] The second insulating component of the above-mentioned technical solution can provide insulation protection for both sides of the adapter plate along the second direction, thereby further reducing the risk of short circuit caused by contact between the adapter plate and the electrode body, and further improving the reliability of the battery cell.

[0051] In some embodiments of the first aspect, the volumetric energy density of the battery cell is less than or equal to 390 Wh / L, and the melting point of the second insulating element is greater than or equal to 100°C; or, the energy density of the battery cell is greater than 390 Wh / L, and the melting point of the second insulating element is greater than or equal to 150°C.

[0052] The above technical solution sets the melting point of the second insulating component according to the different volumetric energy densities of the battery cells, which can reduce the overflow of the heat resistance performance of the second insulating component while meeting the insulation protection requirements, and also reduce costs.

[0053] In some embodiments of the first aspect, the volumetric energy density of the battery cell is less than or equal to 390 Wh / L, and the melting point of the second insulating component is greater than or equal to 150°C; or, the energy density of the battery cell is greater than 390 Wh / L, and the melting point of the second insulating component is greater than or equal to 200°C. By raising the lower limit of the melting point of the second insulating component, the insulation protection effect can be further improved.

[0054] Secondly, this application provides a battery device that includes a battery cell provided in any of the embodiments of the first aspect.

[0055] Thirdly, this application provides an electrical device that includes a battery cell provided in any embodiment of the first aspect or a battery device provided in any embodiment of the second aspect, wherein the battery cell or battery device is used to store or provide electrical energy.

[0056] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0057] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0058] Figure 1 is a schematic diagram of the vehicle structure provided in some embodiments of this application;

[0059] Figure 2 is an exploded structural diagram of a battery device provided in some embodiments of this application;

[0060] Figure 3 is a schematic diagram of the structure of a battery module provided in some embodiments of this application;

[0061] Figure 4 is a schematic diagram of the exploded structure of a battery cell provided in some embodiments of this application;

[0062] Figure 5 is a schematic diagram of the mating structure of a first insulating member, an adapter piece, and a second insulating member of a battery cell provided in some embodiments of this application;

[0063] Figure 6 is an explosion diagram of the structure shown in Figure 5;

[0064] Figure 7 is a schematic diagram of the mating structure of the first insulating member, the adapter piece, and the second insulating member of another battery cell provided in some embodiments of this application;

[0065] Figure 8 is an exploded schematic diagram of the structure shown in Figure 7;

[0066] Figure 9 is a schematic diagram of the mating structure of the first insulating component, the adapter piece, and the second insulating component of another battery cell provided in some embodiments of this application;

[0067] Figure 10 is an exploded schematic diagram of the structure shown in Figure 9;

[0068] Figure 11 is a schematic diagram of the structure of the second insulating component in Figure 9;

[0069] Figure 12 is a partial enlarged structural diagram of point H in Figure 10;

[0070] Figure 13 is a structural schematic diagram of the cooperation of a first insulating member, an adapter piece, and a second insulating member in another battery cell provided in some embodiments of this application, with the second insulating member in a first preset position.

[0071] Figure 14 is a schematic diagram of the structure of a battery cell provided in some embodiments of this application, showing the first insulating member, the adapter piece, and the second insulating member in a second preset position.

[0072] Figure 15 is an explosion diagram of the structure shown in Figure 14;

[0073] Figure 16 is a partial enlarged structural diagram of point K in Figure 15;

[0074] Figure 17 is a partial enlarged structural diagram of point L in Figure 15;

[0075] Figure 18 is a partial enlarged structural diagram of point M in Figure 15;

[0076] Figure 19 is a partial enlarged structural diagram of point N in Figure 15;

[0077] Figure 20 is a schematic diagram of the mating structure of the first insulating member, the adapter piece, and the second insulating member of a battery cell provided in some embodiments of this application;

[0078] Figure 21 is an exploded view of the structure shown in Figure 20.

[0079] The reference numerals in the detailed embodiments are as follows: 1. Vehicle; 2. Battery device; 3. Controller; 4. Motor; 5. Housing; 5a. First housing section; 5b. Second housing section; 5c. Accommodation space; 6. Battery module; 7. Battery cell; 10. Outer shell; 11. First wall; 20. Electrode terminal; 30. Electrode assembly; 31. Electrode body; 311. First end face; 32. Tab; 40. First insulating component; 41. First main body section; 42. Protrusion; 43. Insertion mating part; 44. Rotation mating part; 45. Snap-fit ​​mating part; 50. Adapter piece; 51. First connecting part; 52. Second connecting part; 60. Second insulating member; 60a. First part; 60b. Second part; 61. Second main body part; 62. Fixing part; 63. Slot; 64. Recess; 65. First clearance hole; 66. Insertion part; 67. Rotating part; 68. Snap-fit ​​part; 69. Second clearance hole; 70. Terminal connector; X, thickness direction; Y, first direction; Z, second direction. Detailed Implementation

[0080] 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 and completely 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.

[0081] 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 specification 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 specification, claims, and foregoing drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the specification, claims, or foregoing drawings of this application are used to distinguish different objects, rather than to describe a specific order or hierarchy.

[0082] 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.

[0083] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0084] 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.

[0085] 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.

[0086] In this application, "multiple" means two or more (including two).

[0087] In this application, the term "parallel" includes not only the case of absolute parallelism, but also the case of approximate parallelism as commonly understood in engineering; similarly, "perpendicular" includes not only the case of absolute perpendicularity, but also the case of approximate perpendicularity as commonly understood in engineering.

[0088] 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.

[0089] 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.

[0090] A single battery cell typically includes an electrode assembly. The electrode assembly consists of a positive electrode and a negative electrode. 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.

[0091] 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.

[0092] As an example, the positive current collector has two surfaces opposite each other in its own thickness direction, and the positive active material is disposed on either or both of the two opposite surfaces of the positive current collector.

[0093] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0094] As an example, the negative electrode sheet 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.

[0095] As an example, the negative electrode current collector has two surfaces opposite each other in its own thickness direction, and the negative electrode active material is disposed on either or both of the two opposite surfaces of the negative electrode current collector.

[0096] In some embodiments, the electrode assembly further includes an isolator disposed between the positive and negative electrodes.

[0097] The electrode assembly can be a wound structure, a stacked structure, or a hybrid structure of wound and stacked.

[0098] In some implementations, the electrode assembly is a wound structure. The positive and negative electrode sheets are wound into a wound structure.

[0099] In some implementations, the electrode assembly is a stacked structure.

[0100] As an example, multiple positive and negative electrodes can be set, and multiple positive and multiple negative electrodes can be stacked alternately.

[0101] As an example, multiple positive electrode plates can be provided, and negative electrode plates can be folded to form multiple stacked folded segments, with a positive electrode plate sandwiched between adjacent folded segments.

[0102] As an example, both the positive and negative electrode plates are folded to form multiple stacked folded segments.

[0103] As an example, multiple separators can be provided, each positioned between any adjacent positive or negative electrode plates.

[0104] As an example, the separators can be continuously arranged, either by folding or rolling between any adjacent positive or negative electrode plates.

[0105] In some embodiments, the electrode assembly can be cylindrical, flat, or polygonal, etc.

[0106] In some embodiments, the electrode assembly has tabs that allow current to be drawn from the electrode assembly. The tabs include a positive tab and a negative tab.

[0107] In some embodiments, the battery cell may include a casing. The casing may be a steel casing, an aluminum casing, a plastic casing (such as a polypropylene casing), a composite metal casing (such as a copper-aluminum composite casing), or an aluminum-plastic film, etc. In some embodiments, the casing may be a sealed structure or a non-sealed structure. As an example, when the casing is a non-sealed structure, the casing serves to protect the electrode assembly, and a sealing bag is included between the casing and the electrode assembly to encapsulate the electrode assembly and electrolyte. Specifically, the sealing bag may be a bag-shaped insulating component or an aluminum-plastic film. When the casing is a sealed structure, it is used to encapsulate components such as the electrode assembly and electrolyte.

[0108] As an example, a battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic batteries, such as hexagonal prismatic batteries.

[0109] In some embodiments, the housing includes an end cap and a housing, the housing having an opening, and the end cap covering the opening. The housing may have one or more openings. The end cap may also have one or more.

[0110] In some embodiments, at least one electrode terminal is provided on the housing, and the electrode terminal is electrically connected to the tab. The electrode terminal can be directly connected to the tab, or it can be indirectly connected to the tab through a current collector. The electrode terminal can be provided on the end cap or on the housing.

[0111] The battery apparatus 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 connected in series, parallel, or mixed connections via a busbar.

[0112] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells.

[0113] As an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells together to form an independent module. As another example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0114] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cells housed within the housing.

[0115] As an example, the battery cell assembly can be a battery module, which can be housed in a housing by fixing the battery module in the housing.

[0116] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0117] As an example, the enclosure may include a top cover, a frame, and a bottom plate. The top cover and bottom plate are connected to the frame, creating an enclosed space inside the enclosure to house the individual battery cells.

[0118] 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.

[0119] The technical solutions described in the embodiments of this application are applicable to various electrical devices that use individual battery cells, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles, ships, and spacecraft. For example, spacecraft include airplanes, rockets, space shuttles, and spacecraft.

[0120] With the development of new energy technologies, batteries are being used more and more widely, for example in mobile phones, laptops, electric vehicles, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes, and power tools.

[0121] In the development of battery technology, the reliability of individual battery cells directly affects the reliability, cost of use, and user experience of end products.

[0122] Currently, the lower plastic in the battery cell is in contact with the electrode body of the electrode assembly, creating a certain space between the lower plastic and the electrode body. The adapter piece is located in this space between the lower plastic and the electrode body.

[0123] Because there is no insulating material between the adapter and the electrode body, the adapter can easily come into contact with the electrode body under abnormal conditions, leading to a short circuit and severely affecting the reliability of the battery cell. For example, when the battery cell is heated, the lower plastic of the cell can soften, reducing the support between it and the electrode body, making it easy for the adapter to insert into the electrode body and cause a short circuit. When the battery cell is subjected to vibration, the adapter can easily wobble, which can also cause it to come into contact with the electrode body and trigger a short circuit.

[0124] Based on the above considerations, this application provides a battery cell, which includes a casing, electrode terminals, an electrode assembly, a first insulating member, an adapter plate, and a second insulating member. The casing includes a first wall, and the electrode terminals are disposed on the first wall. The electrode assembly is housed within the casing and includes an electrode body and a tab, with the tab extending from a first end face of the electrode body towards the first wall. The first insulating member is disposed on the side of the first wall facing the electrode assembly. The adapter plate connects the electrode terminals and the tab, and at least a portion of the first insulating member is disposed between the first wall and the adapter plate in the thickness direction of the first wall. At least a portion of the second insulating member is disposed between the adapter plate and the electrode body, and the tab connects to the area of ​​the adapter plate that does not overlap with the second insulating member in the thickness direction.

[0125] The above technical solution provides a second insulating element between the adapter plate and the electrode body. This second insulating element can also create a gap between the adapter plate and the electrode body, thereby insulating the adapter plate from the electrode body and reducing the risk of short circuit caused by contact between the adapter plate and the electrode body. This effectively improves the reliability of the battery cell.

[0126] The battery cell provided in the embodiments of this application is described below with reference to the accompanying drawings.

[0127] Figure 1 is a schematic diagram of the structure of a vehicle provided in some embodiments of this application.

[0128] Referring again to Figure 1, a battery device 2 is installed inside the vehicle 1. The battery device 2 can be located at the bottom, front, or rear of the vehicle 1. The battery device 2 can be used to power the vehicle 1; for example, the battery device 2 can serve as the operating power source for the vehicle 1.

[0129] The 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, for the power needs of the vehicle 1 during starting, navigation and driving.

[0130] 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.

[0131] Figure 2 is an exploded schematic diagram of a battery device provided in some embodiments of this application.

[0132] Referring again to Figure 2, the battery device 2 includes a housing 5 and individual battery cells, with the individual battery cells housed within the housing 5.

[0133] The housing 5 is used to house individual battery cells, and the housing 5 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, and together define a housing space 5c for housing the individual battery cells. The second housing portion 5b may be a hollow structure with one end open, and the first housing portion 5a may be a plate-like structure, with the first housing portion 5a covering the open side of the second housing portion 5b to form a housing 5 with the housing space 5c; alternatively, both the first housing portion 5a and the second housing portion 5b may be hollow structures with one side open, with the open side of the first housing portion 5a covering the open side of the second housing portion 5b to form a housing 5 with the housing space 5c. Of course, the first housing portion 5a and the second housing portion 5b can have various shapes, such as cylinders, cuboids, etc.

[0134] 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.

[0135] 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.

[0136] In battery device 2, there can be one or more battery cells. If there are multiple battery cells, they can be connected in series, parallel, or in a mixed manner. A mixed connection means that multiple battery cells are connected in both series and parallel. Multiple battery cells can be directly connected in series, parallel, or in a mixed manner, and then the whole assembly of multiple battery cells is housed in housing 5. Alternatively, multiple battery cells can first be connected in series, parallel, or in a mixed manner to form battery module 6, and then multiple battery modules 6 can be connected in series, parallel, or in a mixed manner to form a whole assembly, which is then housed in housing 5.

[0137] Figure 3 is a schematic diagram of the battery module shown in Figure 2.

[0138] In some embodiments, continuing to refer to FIG3, there are multiple battery cells 7, which are first connected in series, parallel, or mixed to form a battery module 6. The multiple battery modules 6 are then connected in series, parallel, or mixed to form a whole and housed in a housing.

[0139] Multiple battery cells 7 in battery module 6 can be electrically connected through a busbar component to achieve parallel, series, or mixed connection of multiple battery cells 7 in battery module 6.

[0140] Figure 4 is an exploded structural diagram of a battery cell provided in some embodiments of this application; Figure 5 is a schematic diagram of the mating structure of a first insulating member, an adapter piece, and a second insulating member of a battery cell provided in some embodiments of this application; and Figure 6 is an exploded structural diagram of the structure shown in Figure 5.

[0141] Referring again to Figures 4 to 6, this embodiment of the application provides a battery cell 7, which includes a housing 10, electrode terminals 20, an electrode assembly 30, a first insulating member 40, an adapter plate 50, and a second insulating member 60. The housing 10 includes a first wall 11, and the electrode terminals 20 are disposed on the first wall 11. The electrode assembly 30 is housed within the housing 10 and includes an electrode body 31 and tabs 32, with the tabs 32 extending from the electrode body 31 toward a first end face 311 of the first wall 11. The first insulating member 40 is positioned on the side of the first wall 11 facing the electrode assembly 30. The adapter plate 50 connects the electrode terminals 20 and the tabs 32, and at least a portion of the first insulating member 40 is disposed between the first wall 11 and the adapter plate 50 in the thickness direction X of the first wall 11. In the thickness direction X of the first wall 11, at least a portion of the second insulating member 60 is disposed between the adapter piece 50 and the electrode body 31, and the tab 32 is connected to the area of ​​the adapter piece 50 that does not overlap with the second insulating member 60 in the thickness direction X.

[0142] Exemplarily, the housing 10 is a component used to form the internal environment of the battery cell 7. The formed internal environment can accommodate the electrode assembly 30, electrolyte, and other components. Optionally, the housing 10 can be, but is not limited to, made of metallic or non-metallic materials. For example, metallic materials can be copper, aluminum, or stainless steel; non-metallic materials can be polyethylene, polypropylene, or polyvinyl chloride.

[0143] In some examples, housing 10 includes a housing and an end cap, the housing having an opening and the end cap closing onto the opening.

[0144] The housing is a component used to fit the end cap to form the internal environment of the battery cell 7. This internal environment can accommodate the electrode assembly 30, electrolyte, and other components. The housing and end cap can be separate components, with an opening in the housing. The end cap closes the opening to form the internal environment of the battery cell 7. Optionally, the end cap and housing can be integrated. Specifically, the end cap and housing can form a common connection surface before other components are inserted into the housing. When it is necessary to encapsulate the interior of the housing, the end cap closes the housing. The housing can have various shapes and sizes, such as cuboid, cylindrical, hexagonal prism, etc. Specifically, the shape of the housing can be determined according to the specific shape and size of the electrode assembly 30. The housing can be made of various materials; for example, the housing can be made of, but is not limited to, metallic or non-metallic materials. For example, metallic materials can be copper, aluminum, or stainless steel; non-metallic materials can be polyethylene, polypropylene, or polyvinyl chloride, etc.

[0145] An end cap is a component that covers the opening of the housing to isolate the internal environment of the battery cell 7 from the external environment. Optionally, the shape of the end cap can be adapted to the shape of the housing to fit the housing. Optionally, the end cap can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the end cap is not easily deformed when subjected to compression and impact, giving the battery cell 7 higher structural strength and improved reliability. Functional components such as terminal groups can be set on the end cap. The material of the end cap can also be various. For example, the end cap can be made of, but is not limited to, metallic or non-metallic materials. For example, metallic materials can be copper, aluminum, or stainless steel; non-metallic materials can be polyethylene, polypropylene, or polyvinyl chloride.

[0146] Optionally, the end cap can be detachably attached to the housing or integrally mounted on the housing. The end cap can be directly connected to the housing or constrained to the housing by other components. As an example, the connection method between the end cap and the housing can be, but is not limited to, welding, riveting, or bonding.

[0147] In some examples, the end cap is configured as a first wall 11.

[0148] The electrode assembly 30 is the component in the battery cell 7 where the electrochemical reaction occurs. The electrode assembly 30 is mainly formed by winding or stacking positive and negative electrode sheets, and typically a separator is provided between the positive and negative electrode sheets. The portions of the positive and negative electrode sheets containing active material constitute the main body of the electrode assembly 30, while the portions of the positive and negative electrode sheets without active material each constitute a tab 32. The positive and negative tabs 32 can be located together at one end of the main body or separately at both ends of the main body. During the charging and discharging process of the battery, the positive and negative active materials react with the electrolyte, and the tabs 32 connect to the electrode terminals 20 to form a current loop.

[0149] At least one electrode terminal 20 is provided on the first wall 11. In some examples, the battery cell 7 includes two electrode terminals 20, which are configured as a first electrode terminal and a second electrode terminal, and the first electrode terminal and the second electrode terminal are spaced apart along a first direction Y.

[0150] In some examples, the first direction Y is perpendicular to the thickness direction X of the first wall 11. The first direction Y can be understood as the length direction of the electrode assembly 30, and the thickness direction X of the first wall 11 can also be understood as the thickness direction X of the electrode assembly 30.

[0151] In some examples, the tab 32 includes a positive tab and a negative tab, which are spaced apart along a first direction Y. The positive tab is used to connect to a first electrode terminal, and the negative tab is used to connect to a second electrode terminal.

[0152] In some examples, the battery cell 7 includes two adapter pieces 50, which are configured as a first adapter piece and a second adapter piece. The first adapter piece and the second adapter piece are spaced apart along a first direction Y. The first adapter piece connects a first electrode terminal and a positive electrode tab, and the second adapter piece connects a second electrode terminal and a negative electrode tab.

[0153] In some examples, the battery cell 7 includes two second insulating members 60, one of which is disposed corresponding to the first adapter piece, and the other of which is disposed corresponding to the second adapter piece.

[0154] In the thickness direction X of the first wall 11, at least a portion of the first insulating member 40 is disposed between the first wall 11 and the adapter piece 50. This can be understood as a portion of the first insulating member 40 being disposed between the first wall 11 and the adapter piece 50, or all of the first insulating member 40 being disposed between the first wall 11 and the adapter piece 50.

[0155] In some examples, the adapter plate 50 is provided with a terminal connector 70, which protrudes from the side surface of the adapter plate 50 facing the first wall 11, passes through the first insulating member 40 and is connected to the electrode terminal 20.

[0156] Optionally, the first insulating element 40 may be, but is not limited to, a sheet-like structure, a film-like structure, or a block-like structure.

[0157] Optionally, the first insulating element 40 may be, but is not limited to, made of materials such as polyethylene, polypropylene, polytetrafluoroethylene, polyimide, polyethylene terephthalate, or rubber.

[0158] In some examples, the first insulator 40 is connected to the first wall 11. The first insulator 40 may be directly connected to the first wall 11 or may be constrained to the first wall 11 by other components.

[0159] In the thickness direction X of the first wall 11, at least a portion of the second insulating member 60 is disposed between the adapter piece 50 and the electrode body 31. This can be understood as a portion of the second insulating member 60 being disposed between the adapter piece 50 and the electrode body 31, or the entire second insulating member 60 being disposed between the adapter piece 50 and the electrode body 31.

[0160] The tab 32 is connected to the area of ​​the adapter 50 that does not overlap with the second insulator 60 in the thickness direction X. In other words, the area of ​​the adapter 50 that does not overlap with the second insulator 60 in the thickness direction X is used for electrical connection with the tab 32.

[0161] Optionally, the second insulating element 60 may be, but is not limited to, a sheet-like structure, a film-like structure, or a block-like structure.

[0162] Optionally, the second insulating element 60 may be, but is not limited to, made of materials such as polyethylene, polypropylene, polytetrafluoroethylene, polyimide, polyethylene terephthalate, or rubber.

[0163] The above technical solution provides a second insulating element 60 between the adapter piece 50 and the electrode body 31. The second insulating element 60 can also space the adapter piece 50 and the electrode body 31 to insulate the adapter piece 50 from the electrode body 31, thereby reducing the risk of short circuit caused by contact between the adapter piece 50 and the electrode body 31, and thus effectively improving the reliability of the battery cell 7.

[0164] In some embodiments, the second insulating member 60 is disposed on at least one of the first insulating member 40 and the adapter piece 50.

[0165] For example, the second insulating member 60 may be disposed on the first insulating member 40, or the second insulating member 60 may be disposed on the adapter piece 50, or the second insulating member 60 may be disposed on both the first insulating member 40 and the adapter piece 50.

[0166] It is understandable that the structural characteristics of the first insulating member 40 and the second insulating member 60 are similar, and it is relatively easy to set the second insulating member 60 on the first insulating member 40. Furthermore, the first insulating member 40 and the second insulating member 60 are easy to form as a single piece.

[0167] The adapter piece 50 has a relatively simple structure, and the difficulty of placing the second insulating member 60 on the first insulating member 40 is also relatively low. Furthermore, the second insulating member 60 needs to cover a portion of the adapter piece 50, and certain positioning operations are required during the placement of the second insulating member 60 and the adapter piece 50. Therefore, placing the second insulating member 60 on the adapter piece 50 can also reduce the positioning difficulty between the second insulating member 60 and the adapter piece 50.

[0168] Thus, the above technical solution can reduce the difficulty of manufacturing the second insulating component 60, simplify the manufacturing process, and help reduce the overall production cost of the battery cell 7.

[0169] In some embodiments, the first insulating member 40 includes a first main body portion 41 and a protrusion 42. The protrusion 42 protrudes from the side surface of the first main body portion 41 facing the electrode body 31 and is used to abut against the first end face 311. At least a portion of the first main body portion 41 is disposed between the first wall 11 and the adapter piece 50. In the thickness direction X, the distance between the side surface of the protrusion 42 facing the electrode body 31 and the first end face 311 is less than or equal to the distance between the side surface of the second insulating member 60 facing the electrode body 31 and the first end face 311.

[0170] The protrusion 42 abuts against the first end face 311 of the electrode body 31, so that a receiving cavity can be formed between the first body part 41 and the electrode body 31, which can provide space for the installation of the adapter piece 50 and the second insulating member 60, and reduce the assembly difficulty of the adapter piece 50 and the second insulating member 60.

[0171] For example, the protrusion 42 can be detachably connected to the first main body portion 41, or it can be integrally formed on the first main body portion 41. The protrusion 42 can be directly connected to the first main body portion 41, or it can be constrained to the first main body portion 41 by other components. As an example, the connection method between the protrusion 42 and the first main body portion 41 can be, but is not limited to, riveting or bonding.

[0172] In some examples, the first main body 41 and the protrusion 42 are integrally formed structures.

[0173] On the one hand, the manufacturing process is simplified because there is no need to connect the first main body 41 and the protrusion 42 through an additional connecting process. On the other hand, compared with connecting the first main body 41 and the protrusion 42 through an additional connecting process, the first main body 41 and the protrusion 42, which have an integral structure, have a higher connection strength.

[0174] In the thickness direction X, the distance between the surface of the protrusion 42 facing the electrode body 31 and the first end face 311 is less than or equal to the distance between the surface of the second insulating member 60 facing the electrode body 31 and the first end face 311. This can be understood as the surface of the second insulating member 60 facing the electrode body 31 not extending beyond the surface of the protrusion 42 facing the electrode body 31 in the thickness direction X.

[0175] In other words, the second insulating member 60 is located between the first main body 41 and the electrode body 31 and can form a receiving cavity.

[0176] The above technical solution can reduce the space occupied by the second insulating component 60 in the internal space of the battery cell 7, which is beneficial to improving the energy density of the battery cell 7.

[0177] In some embodiments, the surface of the protrusion 42 facing the electrode body 31 is flush with the surface of the second insulating member 60 facing the electrode body 31. This effectively improves the utilization rate of the internal space of the battery cell 7 and the consistency of the internal structure of the battery cell 7.

[0178] Figure 7 is a schematic diagram of the mating structure of the first insulating member, the adapter piece, and the second insulating member of another battery cell 7 provided in some embodiments of this application, and Figure 8 is an exploded view of the structure shown in Figure 7.

[0179] Referring again to Figures 7 and 8, in some embodiments, the second insulating member 60 and the first insulating member 40 are integrally formed. At least a portion of the second insulating member 60 is located on the side of the first insulating member 40 facing the electrode assembly 30, and a slot 63 is formed between the second insulating member 60 and the first insulating member 40. A portion of the adapter piece 50 is inserted into the slot 63.

[0180] The second insulating member 60 can space the portion of the adapter piece 50 inserted into the slot 63 from the electrode body 31. In other words, at least a portion of the second insulating member 60 is disposed between the portion of the adapter piece 50 inserted into the slot 63 and the electrode body 31.

[0181] The second insulating member 60 and the first insulating member 40 are integrally formed in the above-mentioned technical solution, which has a simple structure, simplifies the manufacturing process, and reduces costs. In addition, the integral forming of the second insulating member 60 and the first insulating member 40 can also help improve the flatness between the side surface of the protrusion 42 facing the electrode body 31 and the side surface of the second insulating member 60 facing the electrode body 31.

[0182] In some embodiments, a recess 64 is provided on the second insulating member 60. The recess 64 is recessed relative to the side surface of the second insulating member 60 along the thickness direction X and facing the first insulating member 40. The recess 64 and the side surface of the first insulating member 40 facing the electrode assembly 30 together define a slot 63.

[0183] The introduction of the recess 64 can increase the internal space of the slot 63, making it easier to insert the adapter piece 50, thereby reducing the assembly difficulty of the adapter piece 50.

[0184] In some embodiments, a first clearance hole 65 is provided on the second insulating member 60, and the first clearance hole 65 penetrates the second insulating member 60 along the thickness direction X. A terminal connector 70 is provided on the adapter piece 50, the terminal connector 70 protrudes from the side surface of the adapter piece 50 facing the first wall 11 and is connected to the electrode terminal 20, and the projection of the terminal connector 70 along the thickness direction X is located within the projection of the first clearance hole 65 along the thickness direction X.

[0185] The first clearance hole 65 is used to avoid the terminal connector 70. It is understood that since the tab 32 is connected to the area of ​​the adapter 50 that does not overlap with the second insulator 60 in the thickness direction X, the terminal connector 70 is often required to be located at the portion of the adapter 50 that inserts into the slot 63. Furthermore, during the assembly of the battery cell 7, the adapter 50 must first be inserted into the slot 63, and then the terminal connector 70 is soldered to the electrode terminal 20 on the side of the adapter 50 facing the second insulator 60.

[0186] Thus, by introducing the first clearance hole 65, the above technical solution facilitates the welding operation between the terminal connector 70 and the electrode terminal 20, thereby reducing the connection difficulty between the terminal connector 70 and the electrode terminal 20 and improving production efficiency.

[0187] Optionally, the projection shape of the first clearance hole 65 along the thickness direction X can be, but is not limited to, a circle, a rectangle, an ellipse, or a polygon.

[0188] For example, the terminal connector 70 can be detachably connected to the adapter plate 50, or it can be integrally disposed on the adapter plate 50. The terminal connector 70 can be directly connected to the adapter plate 50, or it can be constrained to the adapter plate 50 by other components. As an example, the connection method between the terminal connector 70 and the adapter plate 50 can be, but is not limited to, welding, riveting, or bonding.

[0189] In some examples, the terminal connector 70 and the adapter piece 50 are integrally molded. On one hand, this eliminates the need for additional connection processes to link the terminal connector 70 and the adapter piece 50, simplifying the manufacturing process. On the other hand, compared to connecting the terminal connector 70 and the adapter piece 50 through additional connection processes, the integrally molded terminal connector 70 and the adapter piece 50 offer a higher degree of connection strength.

[0190] In some embodiments, the second insulating member 60 and the first insulating member 40 are formed independently, and the second insulating member 60 is disposed on the first insulating member 40.

[0191] For example, the fact that the second insulating component 60 and the first insulating component 40 are formed independently means that the second insulating component 60 and the first insulating component 40 are formed separately by the same process or different processes, and then the second insulating component 60 and the first insulating component 40 are assembled and connected.

[0192] For example, the second insulating member 60 can be detachably connected to the first insulating member 40, or it can be integrally formed on the first insulating member 40. The second insulating member 60 can be directly connected to the first insulating member 40, or it can be constrained to the first insulating member 40 by other components. As an example, the connection method between the second insulating member 60 and the first insulating member 40 can be, but is not limited to, bolt connection, plug connection, riveting, or bonding.

[0193] The second insulating component 60 and the first insulating component 40 are formed independently, allowing for targeted design of the second insulating component 60 and the first insulating component 40 according to different internal environments of the battery cell 7 and the structure of the adapter piece 50, which helps to improve the overall design flexibility of the battery cell 7. The structural characteristics of the first insulating component 40 and the second insulating component 60 are similar, making it relatively easy to place the second insulating component 60 on the first insulating component 40.

[0194] Furthermore, during the assembly of the battery cell 7, the above-mentioned technical solution enables the adapter piece 50 to be welded to the electrode terminal 20 first, and then the second insulating component 60 to be assembled onto the first insulating component 40, thereby reducing the overall manufacturing difficulty of the battery cell 7.

[0195] Thus, the above technical solution can not only reduce the difficulty of manufacturing the battery cell 7, but also improve the overall design flexibility of the battery cell 7.

[0196] Figure 9 is a schematic diagram of the mating structure of the first insulating member, the adapter piece, and the second insulating member of another battery cell provided in some embodiments of this application. Figure 10 is an exploded view of the structure shown in Figure 9. Figure 11 is a structural schematic diagram of the second insulating member in Figure 9. Figure 12 is a partially enlarged structural schematic diagram of point H in Figure 10.

[0197] Referring again to Figures 9 to 12, in some embodiments, the second insulating member 60 is provided with a plug-in portion 66, and the first insulating member 40 is provided with a plug-in mating portion 43 adapted to the plug-in portion 66. The plug-in portion 66 and the plug-in mating portion 43 are plugged in and fixed.

[0198] For example, the insertion part 66 may be a columnar structure, and the insertion mating part 43 may be a groove or hole adapted to the columnar structure, with the insertion part 66 and the insertion mating part 43 having an interference fit. Alternatively, the insertion mating part 43 may be a columnar structure, and the insertion part 66 may be a groove or hole adapted to the columnar structure.

[0199] The first insulating component 40 and the second insulating component 60 of the above technical solution are inserted and fixed, which reduces the assembly difficulty and helps to improve the overall assembly efficiency of the battery cell 7.

[0200] In some embodiments, the first insulating member 40 includes a first main body portion 41 and a protrusion 42. The protrusion 42 protrudes from the surface of the first main body portion 41 facing the electrode body 31 and abuts against the first end face 311. At least a portion of the first main body portion 41 is disposed between the first wall 11 and the adapter piece 50. The second insulating member 60 includes a second main body portion 61 and a fixing portion 62. The fixing portion 62 is connected to the second main body portion 61 and protrudes from the surface of the second main body portion 61 facing the first wall 11. At least a portion of the second main body portion 61 is disposed between the adapter piece 50 and the electrode body 31. A plug-in portion 66 is disposed on the fixing portion 62, and a plug-in mating portion 43 is disposed on the first main body portion 41.

[0201] The protrusion 42 abuts against the first end face 311 of the electrode body 31, so that a receiving cavity can be formed between the first body part 41 and the electrode body 31, which can provide space for the installation of the adapter piece 50 and the second insulating member 60, and reduce the assembly difficulty of the adapter piece 50 and the second insulating member 60.

[0202] A plug-in portion 66 is disposed on a fixing portion 62, and a plug-in mating portion 43 is disposed on a first main body portion 41, so that the second insulating member 60 is connected to the first main body portion 41 of the first insulating member 40 through the fixing portion 62. The fixing portion 62 protrudes from the surface of the second main body portion 61 facing the first wall 11, so that a cavity can be formed between the second main body portion 61 and the first main body portion 41. The cavity can provide space for the adapter piece 50 and reduce the assembly difficulty of the adapter piece 50.

[0203] For example, the fixing part 62 can be detachably connected to the second main body part 61, or it can be integrally provided on the second main body part 61. The fixing part 62 can be directly connected to the second main body part 61, or it can be constrained to the second main body part 61 by other components. As an example, the connection method between the fixing part 62 and the second main body part 61 can be, but is not limited to, riveting or bonding.

[0204] In some examples, the fixing part 62 and the second main body part 61 are integrally formed structures.

[0205] On the one hand, the manufacturing process is simplified because there is no need to connect the fixing part 62 and the second main body part 61 through an additional connection process. On the other hand, compared with connecting the fixing part 62 and the second main body part 61 through an additional connection process, the fixed part 62 and the second main body part 61, which are of an integral structure, have a higher connection strength.

[0206] The above technical solution can effectively reduce the assembly difficulty of the adapter piece 50 and improve the production efficiency and quality of the battery cell 7.

[0207] In some embodiments, the adapter piece 50 includes a first connecting portion 51 and a second connecting portion 52. The first connecting portion 51 is connected to the electrode terminal 20, and the second connecting portion 52 is connected to the tab 32. The first connecting portion 51 and the second connecting portion 52 are arranged along a first direction Y. The second insulating member 60 includes two fixing portions 62, which are respectively connected to both ends of the second main body portion 61 along a second direction Z. The first direction Y, the second direction Z, and the thickness direction X are perpendicular to each other.

[0208] For example, the first connecting portion 51 refers to the portion where the adapter piece 50 connects to the electrode terminal 20, and the second connecting portion 52 refers to the portion where the adapter piece 50 connects to the tab 32. The first connecting portion 51 and the second connecting portion 52 can be spaced apart along the first direction Y, or they can be adjacent to each other along the first direction Y. The first direction Y can be understood as the length direction of the first insulating member 40, and the second direction Z can be understood as the width direction of the first insulating member 40.

[0209] In some examples, the adapter plate 50 is provided with a terminal connector 70, which protrudes from the side surface of the adapter plate 50 facing the first wall 11 and is connected to the electrode terminal 20. The terminal connector 70 is configured as a first connection portion 51.

[0210] It is understandable that, since the fixing part 62 is connected to the first main body part 41, the adapter piece 50 is located between the first main body part 41 and the second main body part 61, and the second connecting part 52 is located on one side of the first connecting part 51 along the first direction Y, the second insulating member 60 needs to be provided corresponding to the first connecting part 51.

[0211] Thus, by providing two fixing parts 62, the above technical solution can further improve the connection firmness of the second insulating member 60. Furthermore, by connecting the two fixing parts 62 to the two ends of the second main body 61 along the second direction Z, after the second insulating member 60 is assembled with the first insulating member 40, the risk of interference between the fixing parts 62 and the second connecting part 52, leading to connection failure between the second connecting part 52 and the tab 32, can be reduced.

[0212] Of course, the number of fixing parts 62 can be one, three, four or more, depending on the actual application environment.

[0213] Figure 13 is a structural schematic diagram of the first insulating member, the adapter piece, and the second insulating member of another battery cell provided in some embodiments of this application, with the second insulating member in a first preset position. Figure 14 is a structural schematic diagram of the first insulating member, the adapter piece, and the second insulating member of another battery cell provided in some embodiments of this application, with the second insulating member in a second preset position. Figure 15 is an exploded view of the structure shown in Figure 14. Figure 16 is a partially enlarged structural schematic diagram of point K in Figure 15. Figure 17 is a partially enlarged structural schematic diagram of point L in Figure 15. Figure 18 is a partially enlarged structural schematic diagram of point M in Figure 15. Figure 19 is a partially enlarged structural schematic diagram of point N in Figure 15.

[0214] Referring again to Figures 13 to 19, in some embodiments, the second insulating member 60 is movably connected to the first insulating member 40 so that the second insulating member 60 can cover or avoid the adapter piece.

[0215] For example, before the adapter piece 50 is assembled with the first insulating member 40, the second insulating member 60 is moved to a first preset position to avoid the adapter piece 50 and provide installation space for the adapter piece 50. After the adapter piece 50 is installed, the second insulating member 60 is moved to a second preset position, covering the side of the adapter piece 50 facing away from the first wall 11, so that at least a portion of the second insulating member 60 is disposed between the adapter piece 50 and the electrode body 31 in the finished battery cell 7.

[0216] In some examples, the second insulator 60 is slidably connected to the first insulator 40, and the sliding of the second insulator 60 relative to the first insulator 40 enables the second insulator 60 to cover or avoid the adapter piece 50.

[0217] The above technical solution can reduce the assembly difficulty of the adapter piece 50 while improving the integration of the first insulating component 40 and the second insulating component 60.

[0218] In some embodiments, the second insulating member 60 is rotatably connected to the first insulating member 40. The rotatable connection between the second insulating member 60 and the first insulating member 40 results in a relatively simple structure, lower installation difficulty, and helps reduce the overall cost of the battery cell 7.

[0219] In some embodiments, a friction element is provided at the rotatable connection between the second insulating member 60 and the first insulating member 40. The friction element is used to increase the frictional force at the rotatable connection between the second insulating member 60 and the first insulating member 40, thereby improving the stability of the second insulating member 60 when it is in a second preset position.

[0220] In some embodiments, the first insulating member 40 includes a first main body portion 41 and a protrusion 42. The protrusion 42 protrudes from the surface of the first main body portion 41 facing the electrode body 31 and abuts against the first end face 311. At least a portion of the first main body portion 41 is disposed between the first wall 11 and the adapter piece 50. The protrusion 42 and the second insulating member 60 are disposed along a first direction Y, and the second insulating member 60 is located on the side of the protrusion 42 near the adapter piece 50. The second insulating member 60 is rotatably connected to the protrusion 42, and the axis of rotation of the second insulating member 60 is parallel to the first direction Y, which intersects the thickness direction X.

[0221] The protrusion 42 abuts against the first end face 311 of the electrode body 31, so that a receiving cavity can be formed between the first body part 41 and the electrode body 31, which can provide space for the installation of the adapter piece 50 and the second insulating member 60, and reduce the assembly difficulty of the adapter piece 50 and the second insulating member 60.

[0222] The protrusion 42 and the second insulating member 60 are arranged along the first direction Y, and the second insulating member 60 is located on the side of the protrusion 42 close to the adapter piece 50. The rotation axis of the second insulating member 60 is parallel to the first direction Y, which can reduce the influence of the protrusion 42 on the rotation of the second insulating member 60.

[0223] The second insulating member 60 is rotatably connected to the protrusion 42. Since the protrusion 42 protrudes from the surface of the first main body 41 facing the electrode body 31, the protrusion 42 can provide a larger installation space for the rotatable connection of the second insulating member 60 relative to the first main body 41, thereby reducing the installation difficulty of the second insulating member 60.

[0224] In some embodiments, the second insulating member 60 is provided with a rotating part 67, and the protrusion 42 is provided with a rotating mating part 44 adapted to the rotating part 67, and the rotating part 67 is inserted into the rotating mating part 44. The structure is simple and can reduce the cost of the battery cell 7.

[0225] For example, the rotating part 67 may be a cylindrical structure, the rotating mating part 44 may be a groove or hole adapted to the cylindrical structure, and the insertion part 66 may be clearance-fitted with the insertion mating part 43. Alternatively, the rotating mating part 44 may be a cylindrical structure, and the rotating part 67 may be a groove or hole adapted to the cylindrical structure.

[0226] In some embodiments, the second insulating member 60 is provided with a snap-fit ​​portion 68, and the protrusion 42 is provided with a snap-fit ​​mating portion 45 adapted to the snap-fit ​​portion 68. The snap-fit ​​portion 68 is used to snap with the snap-fit ​​mating portion 45 to fix the first insulating member 40 and the second insulating member 60.

[0227] For example, the snap-fit ​​part 68 may be a block structure and the snap-fit ​​mating part 45 may be a groove or hole adapted to the block structure; or the snap-fit ​​mating part 45 may be a block structure and the snap-fit ​​part 68 may be a groove or hole adapted to the block structure.

[0228] After the adapter piece 50 is installed, the second insulating member 60 is rotated to position it in the second preset position, and at the same time, the snap-fit ​​part 68 is used to snap-fit ​​with the snap-fit ​​mating part 45 so that the first insulating member 40 and the second insulating member 60 are fixedly connected.

[0229] The above technical solution can improve the stability of the second insulating member 60 in the battery cell 7, thereby reducing the risk of insulation failure caused by the movement of the second insulating member 60.

[0230] In some embodiments, the second insulating member 60 includes a first portion 60a and a second portion 60b, which are spaced apart and disposed opposite to each other along the second direction Z. Both the first portion 60a and the second portion 60b are rotatably connected to the protrusion 42, and the first direction Y, the second direction Z and the thickness direction X are perpendicular to each other.

[0231] For example, the first part 60a and the second part 60b may be made of the same material, have the same shape, and be different in size. In some examples, the first part 60a and the second part 60b are made of the same material, have the same shape, and are different in size, which helps to simplify the manufacturing process of the insulating component and reduce costs.

[0232] In some examples, the first part 60a and the second part 60b open and close in opposite directions of rotation. Specifically, the first part 60a rotates clockwise to move to a first preset position, while the second part 60b rotates counterclockwise to move to the first preset position, thereby avoiding the adapter piece 50 and providing installation space for the adapter piece 50; the first part 60a rotates counterclockwise to move to a second preset position, while the second part 60b rotates clockwise to move to the second preset position, so that the first part 60a and the second part 60b cover the side of the adapter piece 50 facing away from the first wall 11, so that at least a portion of the second insulating member 60 is disposed between the adapter piece 50 and the electrode body 31 in the finished battery cell 7.

[0233] The first part 60a and the second part 60b of the above technical solution can rotate independently of each other, which can further improve the flexibility of the adapter piece 50 during the assembly process.

[0234] In some embodiments, the second insulating member 60 and the first insulating member 40 are formed independently, and the second insulating member 60 is disposed on the adapter piece 50.

[0235] For example, the second insulating member 60 can be detachably connected to the adapter piece 50, or it can be integrally disposed on the adapter piece 50. The second insulating member 60 can be directly connected to the adapter piece 50, or it can be constrained to the adapter piece 50 by other components. As an example, the connection method between the second insulating member 60 and the adapter piece 50 can be, but is not limited to, bolt connection, plug connection, riveting, or bonding.

[0236] The adapter piece 50 has a relatively simple structure, and the difficulty of placing the second insulating member 60 on the first insulating member 40 is also relatively low. Furthermore, the second insulating member 60 needs to cover a portion of the adapter piece 50, and certain positioning operations are required during the placement of the second insulating member 60 and the adapter piece 50. Therefore, placing the second insulating member 60 on the adapter piece 50 can also reduce the positioning difficulty between the second insulating member 60 and the adapter piece 50.

[0237] Figure 20 is a schematic diagram of the mating structure of the first insulating member, the adapter piece, and the second insulating member of a battery cell provided in some embodiments of this application, and Figure 21 is an exploded view of the structure shown in Figure 20.

[0238] Referring again to Figures 20 and 21, in some embodiments, the second insulating element 60 covers a portion of the adapter piece 50.

[0239] For example, the second insulating member 60 covering a portion of the adapter piece 50 means that the second insulating member 60 covers a portion of the adapter piece 50 in a similar wrapping manner, while also leaving a portion of the adapter piece 50 exposed for connection with the tab 32 and the electrode terminal 20.

[0240] During the assembly of the battery cell 7, the second insulating component 60 and the adapter piece 50 can be assembled together, eliminating the need to assemble the second insulating component 60 and the adapter piece 50 separately. This reduces the overall assembly steps of the battery cell 7 and helps improve assembly efficiency.

[0241] Optionally, the second insulating element 60 may be, but is not limited to, being disposed on the adapter piece 50 by means of adhesion, coating or spraying.

[0242] The second insulating component 60 of the above technical solution is disposed on the adapter piece 50 in the form of a cover, which can not only improve the stability of the second insulating component 60, but also reduce the overall assembly complexity of the battery cell 7.

[0243] In some embodiments, a second clearance hole 69 is provided on the second insulating member 60, and the second clearance hole 69 penetrates the second insulating member 60 along the thickness direction X. A terminal connector 70 is provided on the adapter piece 50, the terminal connector 70 protrudes from the side surface of the adapter piece 50 facing the first wall 11 and is connected to the electrode terminal 20, and the projection of the terminal connector 70 along the thickness direction X is located within the projection of the second clearance hole 69 along the thickness direction X.

[0244] The second clearance hole 69 is used to avoid the terminal connector 70. It is understood that since the tab 32 is connected to the area of ​​the adapter 50 that does not overlap with the second insulator 60 in the thickness direction X, the terminal connector 70 often needs to be provided in the part of the adapter 50 covered by the second insulator 60.

[0245] Thus, by introducing the second clearance hole 69, the above technical solution facilitates the welding operation between the terminal connector 70 and the electrode terminal 20, thereby reducing the connection difficulty between the terminal connector 70 and the electrode terminal 20 and improving production efficiency.

[0246] Optionally, the projection shape of the second clearance hole 69 along the thickness direction X can be, but is not limited to, a circle, a rectangle, an ellipse, or a polygon.

[0247] As shown in Figures 5 and 6, in some embodiments, the second insulating member 60 is attached to the side surface of the adapter piece 50 facing the electrode body 31.

[0248] For example, attachment means adhesion, coating, or spraying.

[0249] The above technical solution can reduce the difficulty of manufacturing the second insulating component 60, simplify the manufacturing process, improve the assembly efficiency of the second insulating component 60, and help reduce the overall production cost of the battery cell 7.

[0250] In some embodiments, the melting point of the second insulating member 60 is greater than the melting point of the first insulating member 40.

[0251] The melting point of the second insulating component 60 is greater than that of the first insulating component 40, which makes the heat resistance of the second insulating component 60 stronger than that of the first insulating component 40. Under high temperature environment, the second insulating component 60 is less likely to melt.

[0252] The above technical solution provides a second insulating element 60 with a high melting point between the electrode body 31 and the adapter piece 50. When the battery cell 7 is heated, the second insulating element 60 is less likely to melt. Even if the first insulating element 40 softens and the supporting force decreases, the second insulating element 60 can still space the adapter piece 50 and the electrode body 31 to insulate the adapter piece 50 from the electrode body 31, thereby further improving the reliability of the battery cell 7.

[0253] In some embodiments, the electrode body 31 includes two first surfaces and two second surfaces. The two first surfaces are arranged opposite to each other along a first direction Y, and the two second surfaces are arranged opposite to each other along a second direction Z. The area of ​​the second surfaces is larger than the area of ​​the first surfaces, and the first direction Y, the second direction Z, and the thickness direction X are mutually perpendicular. The portion of the second insulating member 60 located between the adapter piece 50 and the electrode body 31 in the thickness direction X extends along the second direction Z. In the second direction Z, the second insulating member 60 extends beyond the two side edges of the adapter piece 50 along the second direction Z, or the two side edges of the second insulating member 60 along the second direction Z are flush with the two side edges of the adapter piece 50 along the second direction Z.

[0254] For example, the area of ​​the second surface is larger than the area of ​​the first surface, and the second surface may also be referred to as the large surface of the electrode assembly 30. The portion of the second insulating member 60 located in the thickness direction X between the adapter piece 50 and the electrode body 31 refers to the portion of the second insulating member 60 used to space the insulating adapter piece 50 and the electrode body 31.

[0255] It is understandable that the electrode assembly 30 will expand during cycling, and the expansion of the larger surface area of ​​the electrode assembly 30 is relatively large, that is, the expansion of the electrode assembly 30 along the second direction Z is relatively large. Therefore, after the electrode assembly 30 expands, the middle area of ​​the electrode assembly 30 will be recessed relative to the larger surface area. In other words, in the second direction Z, the middle area of ​​the first end face 311 will be recessed relative to the edges of the first end face 311 near the two second surfaces. This makes the risk of short circuit due to the overlap between the two edges of the adapter piece 50 and the electrode body 31 along the second direction Z relatively high.

[0256] Thus, the second insulating component 60 of the above-mentioned technical solution can provide insulation protection for both sides of the adapter piece 50 along the second direction Z, thereby further reducing the risk of short circuit caused by contact between the adapter piece 50 and the electrode body 31, and further improving the reliability of the battery cell 7.

[0257] In some embodiments, the volumetric energy density of the battery cell 7 is less than or equal to 390Wh / L, and the melting point of the second insulating member 60 is greater than or equal to 100°C; or, the energy density of the battery cell 7 is greater than 390Wh / L, and the melting point of the second insulating member 60 is greater than or equal to 150°C.

[0258] For example, when the volumetric energy density of the battery cell 7 is less than or equal to 390Wh / L, the melting point of the second insulating member 60 may be, but is not limited to, 100℃, 120℃, 140℃, 160℃, 180℃, 200℃, 250℃, 300℃, 350℃, 400℃, 450℃, 500℃, etc.

[0259] When the volumetric energy density of the battery cell 7 is greater than 390Wh / L, the melting point of the second insulating component 60 may be, but is not limited to, 150℃, 190℃, 200℃, 220℃, 260℃, 280℃, 300℃, 320℃, 360℃, 380℃, 400℃, 450℃, 500℃, 550℃, 600℃, 700℃, 800℃, etc.

[0260] Understandably, the higher the volumetric energy density of the battery cell 7, the higher the temperature after thermal runaway occurs, and the greater the requirement for the melting point of the second insulating component 60. Conversely, the lower the volumetric energy density of the battery cell 7, the lower the temperature after thermal runaway occurs, and the smaller the requirement for the melting point of the second insulating component 60.

[0261] The above technical solution sets the melting point of the second insulating component 60 according to the different volumetric energy densities of the battery cell 7, which can reduce the overflow of the heat resistance performance of the second insulating component 60 while meeting the insulation protection requirements, and also reduce costs.

[0262] In some embodiments, the volumetric energy density of the battery cell 7 is less than or equal to 390 Wh / L, and the melting point of the second insulating member 60 is greater than or equal to 150°C; or, the energy density of the battery cell 7 is greater than 390 Wh / L, and the melting point of the second insulating member 60 is greater than or equal to 200°C. By raising the lower limit of the melting point of the second insulating member 60, the insulation protection effect can be further improved.

[0263] According to some embodiments of this application, this application also provides a battery device including a battery cell 7 of any of the above schemes.

[0264] According to some embodiments of this application, this application also provides an electrical device, including a battery cell 7 or a battery device of any of the above schemes, wherein the battery cell 7 or the battery device is used to store or provide electrical energy.

[0265] Unless otherwise specified, all embodiments and optional embodiments of this application can be combined to form new technical solutions. All technical features and optional technical features of this application can be combined to form new technical solutions.

[0266] To better understand the battery cell 7 provided in the embodiments of this application, based on the same inventive concept, embodiments of the battery cell 7 in practical applications are provided here for illustration.

[0267] This application provides a battery cell 7, which includes a housing 10, electrode terminals 20, an electrode assembly 30, a first insulating member 40, an adapter plate 50, and a second insulating member 60. The housing 10 includes a first wall 11, and the electrode terminals 20 are disposed on the first wall 11. The electrode assembly 30 is housed within the housing 10 and includes an electrode body 31 and tabs 32, with the tabs 32 extending from the electrode body 31 towards a first end face 311 of the first wall 11. The first insulating member 40 is disposed on the side of the first wall 11 facing the electrode assembly 30. The adapter plate 50 connects the electrode terminals 20 and the tabs 32. In the thickness direction X of the first wall 11, at least a portion of the first insulating member 40 is disposed between the first wall 11 and the adapter plate 50. The second insulating member 60 is disposed on at least one of the first insulating member 40 and the adapter plate 50. In the thickness direction X of the first wall 11, at least a portion of the second insulating member 60 is disposed between the adapter piece 50 and the electrode body 31, and the tab 32 is connected to the area of ​​the adapter piece 50 that does not overlap with the second insulating member 60 in the thickness direction X.

[0268] The first insulating member 40 includes a first main body portion 41 and a protrusion 42. The protrusion 42 protrudes from the surface of the first main body portion 41 facing the electrode body 31 and abuts against the first end face 311. At least a portion of the first main body portion 41 is disposed between the first wall 11 and the adapter piece 50. The surface of the protrusion 42 facing the electrode body 31 is flush with the surface of the second insulating member 60 facing the electrode body 31.

[0269] The above technical solution provides a second insulating element 60 between the adapter piece 50 and the electrode body 31. The second insulating element 60 can also space the adapter piece 50 and the electrode body 31 to insulate the adapter piece 50 from the electrode body 31, thereby reducing the risk of short circuit caused by contact between the adapter piece 50 and the electrode body 31, and thus effectively improving the reliability of the battery cell 7.

[0270] 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 single battery cell, comprising: The outer shell, including the first wall; Electrode terminals are disposed on the first wall; An electrode assembly is housed within the housing. The electrode assembly includes an electrode body and a tab, the tab extending from a first end face of the electrode body toward the first wall. A first insulating element is disposed on the side of the first wall facing the electrode assembly; An adapter plate connects the electrode terminal and the electrode tab, and at least a portion of the first insulating member is disposed between the first wall and the adapter plate in the thickness direction of the first wall; The second insulating member, at least a portion of which is disposed between the adapter plate and the electrode body in the thickness direction of the first wall, wherein the tab is connected to the area of ​​the adapter plate that does not overlap with the second insulating member in the thickness direction.

2. The battery cell according to claim 1, wherein, The second insulating element is disposed in at least one of the first insulating element and the adapter piece.

3. The battery cell according to claim 1 or 2, wherein, The first insulating member includes a first main body portion and a protrusion portion, the protrusion portion protruding from the side surface of the first main body portion facing the electrode body, and at least a portion of the first main body portion is disposed between the first wall and the adapter piece; In the thickness direction, the distance between the side surface of the protrusion facing the electrode body and the first end face is less than or equal to the distance between the side surface of the second insulating member facing the electrode body and the first end face.

4. The battery cell according to claim 3, wherein, The surface of the protrusion facing the electrode body is flush with the surface of the second insulating member facing the electrode body.

5. The battery cell according to any one of claims 1-4, wherein, The second insulating member and the first insulating member are integrally formed. At least a portion of the second insulating member is located on the side of the first insulating member facing the electrode assembly, and a slot is formed between the second insulating member and the first insulating member. A portion of the adapter piece is inserted into the slot.

6. The battery cell according to claim 5, wherein, The second insulating member has a recessed portion, which is recessed relative to the second insulating member along the thickness direction and toward the first insulating member. The recessed portion and the side surface of the first insulating member toward the electrode assembly together define the slot.

7. The battery cell according to claim 5, wherein, The second insulating member has a first clearance hole, which penetrates the second insulating member along the thickness direction; The adapter plate is provided with a terminal connector. The terminal connector protrudes from the side surface of the adapter plate facing the first wall and is connected to the electrode terminal. The projection of the terminal connector along the thickness direction is located within the projection of the first clearance hole along the thickness direction.

8. The battery cell according to any one of claims 1-7, wherein, The second insulating element and the first insulating element are formed independently, and the second insulating element is disposed on the first insulating element.

9. The battery cell according to claim 8, wherein, The second insulating member is provided with a plug-in portion, and the first insulating member is provided with a plug-in mating portion adapted to the plug-in portion. The plug-in portion and the plug-in mating portion are plugged in and fixed.

10. The battery cell according to claim 9, wherein, The first insulating member includes a first main body portion and a protrusion portion. The protrusion portion protrudes from the side surface of the first main body portion facing the electrode body and abuts against the first end face. At least a portion of the first main body portion is disposed between the first wall and the adapter piece. The second insulating member includes a second main body and a fixing part. The fixing part is connected to the second main body and protrudes from the side surface of the second main body facing the first wall. At least a portion of the second main body is disposed between the adapter piece and the electrode body. The insertion part is disposed on the fixing part, and the insertion mating part is disposed on the first main body part.

11. The battery cell according to claim 10, wherein, The adapter includes a first connecting part and a second connecting part, the first connecting part being connected to the electrode terminal, and the second connecting part being connected to the electrode tab, the first connecting part and the second connecting part being arranged along a first direction; The second insulating member includes two fixing parts, which are respectively connected to both ends of the second main body along the second direction, and the first direction, the second direction and the thickness direction are perpendicular to each other.

12. The battery cell according to claim 8, wherein, The second insulating element is movably connected to the first insulating element so that the second insulating element can cover or avoid the adapter piece.

13. The battery cell according to claim 12, wherein, The second insulating element is rotatably connected to the first insulating element.

14. The battery cell according to claim 13, wherein, The first insulating member includes a first main body portion and a protrusion portion. The protrusion portion protrudes from the side surface of the first main body portion facing the electrode body and abuts against the first end face. At least a portion of the first main body portion is disposed between the first wall and the adapter piece. The protrusion and the second insulating member are disposed along a first direction, and the second insulating member is located on the side of the protrusion near the adapter piece. The second insulating member is rotatably connected to the protrusion, and the rotation axis of the second insulating member is parallel to the first direction, which intersects the thickness direction.

15. The battery cell according to claim 14, wherein, The second insulating member is provided with a snap-fit ​​portion, and the protrusion is provided with a snap-fit ​​mating portion adapted to the snap-fit ​​portion. The snap-fit ​​portion is used to snap into the snap-fit ​​mating portion to fix the first insulating member and the second insulating member.

16. The battery cell according to claim 14, wherein, The second insulating member includes a first part and a second part, which are spaced apart and disposed opposite to each other along a second direction. Both the first part and the second part are rotatably connected to the protrusion. The first direction, the second direction and the thickness direction are perpendicular to each other.

17. The battery cell according to any one of claims 1-16, wherein, The second insulating element and the first insulating element are formed independently, and the second insulating element is disposed on the adapter piece.

18. The battery cell according to claim 17, wherein, The second insulating element covers a portion of the adapter piece.

19. The battery cell according to claim 18, wherein, The second insulating member has a second clearance hole, which penetrates the second insulating member along the thickness direction of the first insulating member; The adapter plate is provided with a terminal connector. The terminal connector protrudes from the side surface of the adapter plate facing the first wall and is connected to the electrode terminal. The projection of the terminal connector along the thickness direction is located within the projection of the second clearance hole along the thickness direction.

20. The battery cell according to claim 17, wherein, The second insulating element is attached to the side surface of the adapter plate facing the electrode body.

21. The battery cell according to any one of claims 1-20, wherein, The melting point of the second insulating component is greater than that of the first insulating component.

22. The battery cell according to any one of claims 1-21, wherein, The electrode body includes two first surfaces and two second surfaces. The two first surfaces are arranged opposite to each other along a first direction, and the two second surfaces are arranged opposite to each other along a second direction. The area of ​​the second surface is larger than the area of ​​the first surface. The first direction, the second direction and the thickness direction are perpendicular to each other. The portion of the second insulating member located between the adapter piece and the electrode body in the thickness direction extends along the second direction; In the second direction, the second insulating member extends beyond the two side edges of the adapter piece along the second direction, or the two side edges of the second insulating member along the second direction are flush with the two side edges of the adapter piece along the second direction.

23. The battery cell according to any one of claims 1-22, wherein, The volumetric energy density of the battery cell is less than or equal to 390 Wh / L, and the melting point of the second insulating component is greater than or equal to 100°C; or, The energy density of the battery cell is greater than 390Wh / L, and the melting point of the second insulating component is greater than or equal to 150℃.

24. The battery cell according to claim 23, wherein, The volumetric energy density of the battery cell is less than or equal to 390 Wh / L, and the melting point of the second insulating component is greater than or equal to 150°C; or, The energy density of the battery cell is greater than 390Wh / L, and the melting point of the second insulating component is greater than or equal to 200℃.

25. A battery device comprising a plurality of battery cells as described in any one of claims 1-24.

26. An electrical device comprising a battery cell as claimed in any one of claims 1-24 or a battery device as claimed in claim 25, wherein the battery cell or the battery device is used to store or provide electrical energy.

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