Battery monomer, battery device and electric device

Abstract

The utility model provides a battery monomer, a battery device and a power utilization device. The battery monomer comprises a shell, an electrode terminal, an electrode assembly, a first insulating part, an adapter plate and a second insulating part, the shell comprises a first wall, and the electrode terminal is arranged on the first wall. The electrode assembly is contained in the shell and comprises an electrode body and a tab, and the tab is led out from the electrode body towards the first end face of the first wall. The first insulator is disposed on a side of the first wall facing the electrode assembly. The adapter sheet is connected with the electrode terminal and the tab, and at least part of the first insulating part is arranged between the first wall and the adapter sheet in the thickness direction of the first wall. In the thickness direction of the first wall, at least part of the second insulating part is arranged between the switching piece and the electrode main body, and the tab is connected to the area, not overlapped with the second insulating part, of the switching piece in the thickness direction. According to the invention, the reliability of the battery monomer can be effectively improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery cell, a battery device, and an electrical device. Background Art

[0002] With the development of new energy technology, batteries are used more and more widely, for example, in mobile phones, laptops, electric vehicles, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes and power tools.

[0003] In the development of battery technology, the reliability of battery cells directly affects the reliability, cost of use, and user experience of end products. Therefore, how to effectively improve the reliability of battery cells is a technical issue that needs continuous improvement in battery technology. Utility Model Content

[0004] In view of the above problems, the present application provides a battery cell, a battery device and an electrical device, which can effectively improve the reliability of the battery cell.

[0005] In a first aspect, an embodiment of the present application provides a battery cell, which includes a shell, an electrode terminal, an electrode assembly, a first insulating member, a adapter plate, and a second insulating member. The shell includes a first wall, and the electrode terminal is arranged on the first wall. The electrode assembly is accommodated in the shell, and the electrode assembly includes an electrode body and a tab, and the tab is extended from the first end face of the electrode body toward the first wall. The first insulating member is placed on the side of the first wall facing the electrode assembly. The adapter plate connects the electrode terminal and the tab, and in the thickness direction of the first wall, at least a portion of the first insulating member is arranged 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 arranged between the adapter plate and the electrode body, and the tab is connected to the area of ​​the adapter plate that does not overlap with the second insulating member in the thickness direction.

[0006] The above technical solution sets a second insulating member between the adapter and the electrode body. The second insulating member can also space the adapter and the electrode body to insulate the adapter and the electrode body, reducing the risk of short circuit caused by contact between the adapter and the electrode body, thereby effectively improving the reliability of the battery cell.

[0007] In some embodiments of the first aspect, the second insulating member is disposed on at least one of the first insulating member and the adapter.

[0008] The above technical solution can reduce the difficulty of preparing the second insulating member, simplify the preparation process, and help reduce the overall production cost of the battery cell.

[0009] In some embodiments of the first aspect, the first insulating member comprises a first main portion and a protruding portion protruding from the first main portion towards the one side surface of the electrode body, and at least a portion of the first main portion is arranged between the first wall and the adapter tab. In the thickness direction, the distance between the protruding portion and the first end surface is less than or equal to the distance between the second insulating member and the first end surface.

[0010] The above technical solution can reduce the occupation of the second insulating member to the internal space of the battery monomer, and is beneficial to improve the energy density of the battery monomer.

[0011] In some embodiments of the first aspect, the protruding portion is flush with the one side surface of the second insulating member towards the electrode body.

[0012] The utilization rate of the internal space of the battery monomer and the consistency of the internal structure of the battery monomer can be effectively improved.

[0013] In some embodiments of the first aspect, the second insulating member is integrally formed with the first insulating member, at least a portion of the second insulating member is located on the one side of the first insulating member towards the electrode assembly, and a slot is formed between the second insulating member and the first insulating member, and a portion of the adapter tab is inserted into the slot.

[0014] The second insulating member of the above technical solution is integrally formed with the first insulating member, which is simple in structure, can simplify the preparation process and reduce the cost. In addition, the integrally formed second insulating member and the first insulating member can also help to improve the flushness between the protruding portion towards the one side surface of the electrode body and the one side surface of the second insulating member towards the electrode body.

[0015] In some embodiments of the first aspect, a recess is arranged on the second insulating member, the recess is recessed relative to the second insulating member in the thickness direction and towards the one side surface of the first insulating member, and the recess and the one side surface of the first insulating member towards the electrode assembly jointly define the slot.

[0016] The introduction of the recess can increase the internal space of the slot, facilitate the insertion of the adapter tab, and thus reduce the assembly difficulty of the adapter tab.

[0017] In some embodiments of the first aspect, a first avoiding hole is arranged on the second insulating member, and the first avoiding hole penetrates the second insulating member in the thickness direction. A terminal connecting member is arranged on the adapter tab, the terminal connecting member protrudes from the one side surface of the adapter tab towards the first wall and is connected to the electrode terminal, and the projection of the terminal connecting member in the thickness direction is located in the projection of the first avoiding hole in the thickness direction.

[0018] The above technical solution introduces the first avoiding hole, which facilitates the welding operation of the terminal connecting member and the electrode terminal, thereby reducing the connection difficulty between the terminal connecting member and the electrode terminal and improving the production efficiency.

[0019] 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.

[0020] The above technical solution can not only reduce the difficulty of preparing battery cells, but also improve the overall design flexibility of battery cells.

[0021] In some embodiments of the first aspect, the second insulating member is provided with a plug-in portion, and the first insulating member is provided with a plug-in fitting portion adapted to the plug-in portion, and the plug-in portion and the plug-in fitting portion are plugged and fixed.

[0022] The first insulating member and the second insulating member of the above technical solution are plugged and fixed, which has low assembly difficulty and helps to improve the overall assembly efficiency of the battery cell.

[0023] In some embodiments of the first aspect, the first insulating member includes a first main body and a protrusion, the protrusion protruding from a side surface of the first main body facing the electrode body, the protrusion abutting the first end surface, and at least a portion of the first main body is disposed between the first wall and the adapter plate. The second insulating member includes a second main body and a fixing portion, the fixing portion connected to the second main body and protruding from a side surface of the second main body facing the first wall, and at least a portion of the second main body is disposed between the adapter plate and the electrode body. The plug-in portion is disposed on the fixing portion, and the plug-in mating portion is disposed on the first main body.

[0024] The above technical solution can effectively reduce the difficulty of assembling the adapter and improve the production efficiency and quality of the battery cells.

[0025] In some embodiments of the first aspect, the adapter plate includes a first connecting portion and a second connecting portion, the first connecting portion being connected to the electrode terminal, the second connecting portion being connected to the tab, and the first connecting portion and the second connecting portion being arranged along a first direction. The second insulating member includes two fixing portions, the two fixing portions being respectively connected to ends of the second main portion along a second direction, with the first direction, the second direction, and the thickness direction being perpendicular to each other.

[0026] The above technical solution can further enhance the connection strength of the second insulating member by providing two fixing portions. Furthermore, by connecting the two fixing portions to the two ends of the second main body along the second direction, after the second insulating member is assembled to the first insulating member, the risk of interference between the fixing portions and the second connecting portion, which could lead to connection failure between the second connecting portion and the tab, can be reduced.

[0027] 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.

[0028] The above technical solution can reduce the difficulty of assembling the adapter and improve the integrity of the first insulating member and the second insulating member.

[0029] In some embodiments of the first aspect, the second insulating member is rotatably connected to the first insulating member.

[0030] The second insulating member is rotatably connected to the first insulating member, has a relatively simple structure, is relatively easy to set up, and helps to reduce the overall cost of the battery cell.

[0031] In some embodiments of the first aspect, the first insulating member includes a first main portion and a protrusion. The protrusion protrudes from a surface of the first main portion facing the electrode body, abuts the first end surface, and at least a portion of the first main portion is disposed between the first wall and the adapter plate. The protrusion and the second insulating member are disposed along a first direction, with the second insulating member located on a side of the protrusion proximate to the adapter plate. 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.

[0032] The above technical solution can not only reduce the influence of the protrusion on the rotation of the second insulating member, but also reduce the difficulty of setting the second insulating member.

[0033] In some embodiments of the first aspect, a snap-fit ​​portion is provided on the second insulating member, and the protrusion is provided with a snap-fitting portion adapted to the snap-fitting portion, and the snap-fitting portion is used to snap-fit ​​with the snap-fitting portion to fix the first insulating member and the second insulating member.

[0034] The above technical solution can improve the stability of the second insulating member in the battery cell, so as to reduce the risk of insulation failure caused by movement of the second insulating member.

[0035] In some embodiments of the first aspect, the second insulating member includes a first part and a second part, the first part and the second part are spaced apart and arranged opposite to each other along the second direction, the first part and the second part are both rotatably connected to the protrusion, and the first direction, the second direction and the thickness direction are perpendicular to each other.

[0036] The first part and the second part of the above technical solution can rotate independently of each other, which can further improve the flexibility of the adapter assembly process.

[0037] 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 plate.

[0038] The adapter plate has a relatively simple structure, making it relatively easy to position the second insulating member on the first insulating member. Furthermore, the second insulating member needs to cover a portion of the adapter plate, requiring some positioning during the placement of the second insulating member and the adapter plate. Therefore, placing the second insulating member on the adapter plate can also reduce the difficulty of positioning the second insulating member and the adapter plate.

[0039] In some embodiments of the first aspect, the second insulating member covers a portion of the adapter.

[0040] The second insulating member of the above technical solution is provided on the adapter in a wrapped form, which can not only improve the stability of the second insulating member, but also reduce the overall assembly complexity of the battery cell.

[0041] In some embodiments of the first aspect, a second avoidance hole is defined in the second insulating member, extending through the second insulating member along a thickness direction of the first insulating member. A terminal connector is provided on the adapter plate, projecting from a surface of the adapter plate facing the first wall and connected to the electrode terminal, with a projection of the terminal connector along the thickness direction located within a projection of the second avoidance hole along the thickness direction.

[0042] The above technical solution facilitates the welding operation between the terminal connector and the electrode terminal by introducing the second avoidance hole, thereby reducing the difficulty of connecting the terminal connector and the electrode terminal and improving production efficiency.

[0043] In some embodiments of the first aspect, the second insulating member is attached to a surface of the adapter facing the electrode body.

[0044] The above technical solution can reduce the difficulty of preparing the second insulating member, simplify the preparation process, improve the assembly efficiency of the second insulating member, and help reduce the overall production cost of the battery cell.

[0045] In some embodiments of the first aspect, the melting point of the second insulating member is greater than the melting point of the first insulating member.

[0046] The above technical solution sets a second insulating member with a higher melting point between the electrode body and the adapter plate. When the battery cell is heated, the second insulating member is not easy to melt. Even if the first insulating member softens and the supporting force decreases, the second insulating member can still space the adapter plate and the electrode body to insulate the adapter plate and the electrode body, which can further improve the reliability of the battery cell.

[0047] In some embodiments of the first aspect, 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, the two second surfaces are arranged 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 perpendicular to each other. A portion of the second insulating member located between the adapter plate 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 plate in the second direction, or the two side edges of the second insulating member in the second direction are flush with the two side edges of the adapter plate in the second direction.

[0048] The second insulating member of the above technical solution can focus on insulating and protecting the two side edges of the adapter along the second direction, thereby further reducing the risk of short circuit caused by contact between the adapter and the electrode body, and further improving the reliability of the battery cell.

[0049] In some embodiments of the first aspect, the volume energy density of the battery cell is less than or equal to 390Wh / L, and the melting point of the second insulating member 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 member is greater than or equal to 150°C.

[0050] The above technical solution can reduce the heat resistance overflow of the second insulating member while meeting the insulation protection requirements and reducing costs by specifically setting the melting point of the second insulating member according to the different volume energy densities of the battery cells.

[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 member is greater than or equal to 150° C.; alternatively, the energy density of the battery cell is greater than 390 Wh / L, and the melting point of the second insulating member is greater than or equal to 200° C. By increasing the lower limit of the melting point of the second insulating member, the insulation protection effect can be further improved.

[0052] In a second aspect, the present application provides a battery device comprising the battery cell provided in any embodiment of the first aspect.

[0053] In a third aspect, the present application provides an electrical device, which includes a battery cell provided by any embodiment of the first aspect or a battery device provided by any embodiment of the second aspect, and the battery cell or the battery device is used to store or provide electrical energy.

[0054] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present application. The same reference symbols are used throughout the drawings to represent the same components. In the drawings:

[0056] Figure 1 A schematic structural diagram of a vehicle provided in some embodiments of the present application;

[0057] Figure 2 A schematic diagram of an exploded structure of a battery device provided in some embodiments of the present application;

[0058] Figure 3 A schematic structural diagram of a battery module provided in some embodiments of the present application;

[0059] Figure 4 A schematic diagram of an exploded structure of a battery cell provided in some embodiments of the present application;

[0060] Figure 5 A schematic diagram of the matching structure of a first insulating member, a switching plate, and a second insulating member of a battery cell provided in some embodiments of the present application;

[0061] Figure 6 for Figure 5 An exploded schematic diagram of the structure shown;

[0062] Figure 7 A schematic diagram of the matching structure of a first insulating member, a switching plate, and a second insulating member of another battery cell provided in some embodiments of the present application;

[0063] Figure 8 for Figure 7 An exploded schematic diagram of the structure shown;

[0064] Figure 9 A schematic diagram of the matching structure of a first insulating member, a switching plate, and a second insulating member of another battery cell provided in some embodiments of the present application;

[0065] Figure 10 for Figure 9 An exploded schematic diagram of the structure shown;

[0066] Figure 11 for Figure 9 A schematic structural diagram of the second insulating member in FIG.

[0067] Figure 12 for Figure 10 Schematic diagram of the local enlarged structure at H;

[0068] Figure 13A schematic structural diagram of a first insulating member, a switching plate, and a second insulating member of another battery cell provided in some embodiments of the present application, wherein the second insulating member is in a first preset position;

[0069] Figure 14 A schematic structural diagram of a first insulating member, a switching plate, and a second insulating member of another battery cell provided in some embodiments of the present application, wherein the second insulating member is in a second preset position;

[0070] Figure 15 for Figure 14 An exploded schematic diagram of the structure shown;

[0071] Figure 16 for Figure 15 Schematic diagram of the local enlarged structure at K;

[0072] Figure 17 for Figure 15 Schematic diagram of the local enlarged structure at L;

[0073] Figure 18 for Figure 15 A schematic diagram of the local enlarged structure at M;

[0074] Figure 19 for Figure 15 Schematic diagram of the local enlarged structure at N;

[0075] Figure 20 A schematic diagram of the matching structure of a first insulating member, a switching plate, and a second insulating member of a battery cell provided in some embodiments of the present application;

[0076] Figure 21 for Figure 20 Exploded view of the structure shown.

[0077] The accompanying drawings in the specific implementation manner are as follows:

[0078] 1. Vehicle; 2. Battery device; 3. Controller; 4. Motor; 5. Housing; 5a. First housing portion; 5b. Second housing portion; 5c. Accommodation space; 6. Battery module; 7. Battery cell;

[0079] 10. housing; 11. first wall;

[0080] 20. Electrode terminals;

[0081] 30. Electrode assembly; 31. Electrode body; 311. First end surface; 32. Tab;

[0082] 40. First insulating member; 41. First main body; 42. Protrusion; 43. Insertion-fitting portion; 44. Rotation-fitting portion; 45. Snap-fitting portion;

[0083] 50. Adapter; 51. First connecting portion; 52. Second connecting portion;

[0084] 60. Second insulating member; 60a. First portion; 60b. Second portion; 61. Second main body; 62. Fixing portion; 63. Slot; 64. Recess; 65. First avoidance hole; 66. Insertion portion; 67. Rotation portion; 68. Clamping portion; 69. Second avoidance hole;

[0085] 70. Terminal connector;

[0086] X, thickness direction; Y, first direction; Z, second direction. DETAILED DESCRIPTION

[0087] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0088] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first" and "second" in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary-secondary relationship.

[0089] References to "embodiments" in this application mean that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments.

[0090] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connected," and "attached" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0091] The term "and / or" in this application simply describes an association between related objects, indicating that three possible relationships exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this application generally indicates that the related objects are in an "or" relationship.

[0092] In the embodiments of this application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components in different embodiments are omitted. It should be understood that the thickness, length, width, and other dimensions of the various components in the embodiments of this application, as well as the overall thickness, length, width, and other dimensions of the integrated device shown in the drawings are merely illustrative and should not constitute any limitation on this application.

[0093] The term "plurality" used in this application refers to two or more (including two).

[0094] In this application, the term "parallel" includes not only the absolutely parallel situation, but also the roughly parallel situation conventionally recognized in engineering; at the same time, "vertical" also includes not only the absolutely vertical situation, but also the roughly vertical situation conventionally recognized in engineering.

[0095] In the embodiment of the present application, the battery cell may be a secondary battery cell. A secondary battery cell refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0096] 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-hydrogen battery cell, a nickel-cadmium battery cell, a lead-acid battery cell, etc., and the embodiments of the present application are not limited to this.

[0097] A battery cell typically includes an electrode assembly. This assembly includes a positive electrode and a negative electrode. During the charge and discharge process of a battery cell, active ions (such as lithium ions) are intercalated and released back and forth between the positive and negative electrodes.

[0098] 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.

[0099] As an example, the positive electrode current collector has two surfaces facing each other in its thickness direction, and the positive electrode active material is provided on either or both of the two facing surfaces of the positive electrode current collector.

[0100] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0101] 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.

[0102] As an example, the negative electrode current collector has two surfaces facing each other in its thickness direction, and the negative electrode active material is provided on either or both of the two facing surfaces of the negative electrode current collector.

[0103] In some embodiments, the electrode assembly further includes a separator disposed between the positive electrode and the negative electrode.

[0104] The electrode assembly may be a wound structure, a laminated structure, or a mixed structure of wound and laminated structures.

[0105] In some embodiments, the electrode assembly is a wound structure, wherein the positive electrode sheet and the negative electrode sheet are wound into the wound structure.

[0106] In some embodiments, the electrode assembly is a laminate structure.

[0107] As an example, multiple positive electrode sheets and multiple negative electrode sheets can be provided respectively, and the multiple positive electrode sheets and the multiple negative electrode sheets can be alternately stacked.

[0108] As an example, a plurality of positive electrode sheets may be provided, and the negative electrode sheet may be folded to form a plurality of stacked folded segments, with a positive electrode sheet being sandwiched between adjacent folded segments.

[0109] As an example, both the positive electrode sheet and the negative electrode sheet are folded to form a plurality of stacked folded segments.

[0110] As an example, a plurality of separators may be provided, each of which is disposed between any adjacent positive electrode sheets or negative electrode sheets.

[0111] As an example, the separator may be provided continuously, and may be provided between any adjacent positive electrode sheets or negative electrode sheets by folding or winding.

[0112] In some embodiments, the shape of the electrode assembly can be cylindrical, flat, or polygonal.

[0113] In some embodiments, the electrode assembly is provided with tabs that can conduct current from the electrode assembly. The tabs include a positive tab and a negative tab.

[0114] In some embodiments, the battery cell can include a housing. The housing can be a steel housing, an aluminum housing, a plastic housing (e.g., polypropylene), a composite metal housing (e.g., copper-aluminum composite housing), an aluminum-plastic film, or the like. In some embodiments, the housing can be a sealed structure or a non-sealed structure. As an example, when the housing is a non-sealed structure, the housing serves to protect the electrode assembly, and a sealing bag is further included between the housing and the electrode assembly, which is used to encapsulate the electrode assembly and the electrolyte. Specifically, the sealing bag can be a bag-shaped insulating member or an aluminum-plastic film. When the housing is a sealed structure, the housing is used to encapsulate the electrode assembly, the electrolyte, and the like.

[0115] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes, and the prismatic battery cell includes a square-shaped battery cell, a blade-shaped battery cell, a multi-prismatic battery cell (e.g., a hexagonal battery cell), or the like.

[0116] In some embodiments, the housing includes an end cap and a housing body, and the housing body is provided with an opening, and the end cap is provided on the opening. The housing body can be provided with one or more openings. The end cap can also be provided with one or more openings.

[0117] 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 indirectly connected to the tab through a current collecting member. The electrode terminal can be provided on the end cap or on the housing body.

[0118] The battery apparatus mentioned in the embodiments of the present application can include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly can include a plurality of battery cells connected in series, in parallel, or in a mixed connection through a current collecting member.

[0119] In some embodiments, the battery cell assembly is generally formed by arranging a plurality of battery cells.

[0120] As an example, the battery cell assembly can be a battery module formed by arranging and fixing a plurality of battery cells into a separate module. As an example, the battery module can be formed by bundling a plurality of battery cells with a cable tie.

[0121] In some embodiments, the battery apparatus can be a battery pack including a box body and one or more battery cell assemblies accommodated in the box body.

[0122] As an example, the battery cell assembly may be a battery module, and the battery cell assembly may be accommodated in the box by fixing the battery module in the box.

[0123] As an example, the battery cell assembly may also be housed in the box by directly fixing the plurality of battery cells to the box.

[0124] As an example, the box may include a top cover, a frame, and a bottom plate, wherein the top cover and the bottom plate are respectively connected to the frame to form a closed space inside the box to accommodate the battery cell assembly.

[0125] In some embodiments, the box body can be used as a part of the chassis structure of the vehicle. For example, part of the box body can become at least a part of the floor of the vehicle, or part of the box body can become at least a part of the cross beam and longitudinal beam of the vehicle.

[0126] The technical solutions described in the embodiments of the present application are applicable to various electrical devices that use battery cells, such as mobile phones, portable devices, laptop computers, electric vehicles, electric toys, electric tools, vehicles, ships and spacecraft, for example, spacecraft include airplanes, rockets, space shuttles and spacecraft, etc.

[0127] With the development of new energy technology, batteries are used more and more widely, for example, in mobile phones, laptops, electric vehicles, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes and power tools.

[0128] In the development of battery technology, the reliability of battery cells will directly affect the reliability, usage cost and user experience of terminal products.

[0129] Currently, the lower plastic in the battery cell abuts against the electrode body of the electrode assembly, so that a certain space is formed between the lower plastic and the electrode body. The adapter is located in the space formed between the lower plastic and the electrode body.

[0130] Because there's no insulating member between the adapter and the electrode body, the adapter can easily come into contact with the electrode body when the battery cell is subjected to abnormal conditions, causing a short circuit and severely impacting the reliability of the battery cell. For example, when the battery cell is heated, the lower plastic of the battery cell can soften, reducing the support between the cell and the electrode body, making it easy for the adapter to slip into the electrode body and cause a short circuit. When the battery cell is vibrated, the adapter can easily wobble, causing contact between the adapter and the electrode body and causing a short circuit.

[0131] Based on the above considerations, an embodiment of the present application provides a battery cell, which includes a shell, an electrode terminal, an electrode assembly, a first insulating member, a adapter plate, and a second insulating member. The shell includes a first wall, and the electrode terminal is arranged on the first wall. The electrode assembly is accommodated in the shell, and the electrode assembly includes an electrode body and a tab, and the tab is extended from the first end face of the electrode body toward the first wall. The first insulating member is placed on the side of the first wall facing the electrode assembly. The adapter plate connects the electrode terminal and the tab, and in the thickness direction of the first wall, at least a portion of the first insulating member is arranged between the first wall and the adapter plate. At least a portion of the second insulating member is arranged between the adapter plate and the electrode body, and the tab is connected to the area of ​​the adapter plate that does not overlap with the second insulating member in the thickness direction.

[0132] The above technical solution sets a second insulating member between the adapter and the electrode body. The second insulating member can also space the adapter and the electrode body to insulate the adapter and the electrode body, reducing the risk of short circuit caused by contact between the adapter and the electrode body, thereby effectively improving the reliability of the battery cell.

[0133] The battery cells provided in the embodiments of the present application are introduced below with reference to the accompanying drawings.

[0134] Figure 1 A schematic structural diagram of a vehicle provided for some embodiments of the present application.

[0135] Continue to refer Figure 1 The vehicle 1 is provided with a battery device 2 inside. The battery device 2 can be provided at the bottom, head, or tail 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 an operating power source for the vehicle 1.

[0136] The vehicle 1 may further include a controller 3 and a motor 4 . The controller 3 is used to control the battery device 2 to supply power to the motor 4 , for example, to meet the power requirements of the vehicle 1 during startup, navigation, and driving.

[0137] In some embodiments of the present application, the battery device 2 can not only serve as the operating power source of the vehicle 1, but also serve as the driving power source of the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.

[0138] Figure 2 Schematic diagram of an explosion of a battery device provided in some embodiments of the present application.

[0139] Continue to refer Figure 2 The battery device 2 includes a box body 5 and a battery cell, and the battery cell is accommodated in the box body 5.

[0140] The housing 5 is used to house battery cells and can have various structures. In some embodiments, the housing 5 can include a first housing portion 5a and a second housing portion 5b. The first housing portion 5a and the second housing portion 5b overlap each other, and the first housing portion 5a and the second housing portion 5b together define a storage space 5c for accommodating the battery cells. The second housing portion 5b can be a hollow structure with one end open. The first housing portion 5a is a plate-like structure, and the first housing portion 5a overlaps the open side of the second housing portion 5b to form the housing 5 with the storage space 5c. The first housing portion 5a and the second housing portion 5b can also be hollow structures with one end open. The open side of the first housing portion 5a overlaps the open side of the second housing portion 5b to form the housing 5 with the storage space 5c. Of course, the first housing portion 5a and the second housing portion 5b can have various shapes, such as a cylinder, a rectangular parallelepiped, etc.

[0141] In order to improve the sealing performance after the first box body 5a and the second box body 5b are connected, a sealing member, such as a sealant, a sealing ring, etc., may also be provided between the first box body 5a and the second box body 5b.

[0142] Assuming that the first box body portion 5a covers the top of the second box body portion 5b, the first box body portion 5a can also be called an upper box cover, and the second box body portion 5b can also be called a lower box body.

[0143] In the battery device 2, there can be one or more battery cells. If there are multiple battery cells, they can be connected in series, in parallel, or in a hybrid connection. A hybrid connection refers to a combination of series and parallel connections. Multiple battery cells can be directly connected in series, in parallel, or in a hybrid connection, and then the entire battery unit can be housed within the housing 5. Alternatively, multiple battery cells can be first connected in series, in parallel, or in a hybrid connection to form a battery module 6, and then the multiple battery modules 6 can be connected in series, in parallel, or in a hybrid connection to form a single unit and housed within the housing 5.

[0144] Figure 3 for Figure 2 The schematic diagram of the battery module is shown.

[0145] In some embodiments, continue to refer to Figure 3 There are multiple battery cells 7, and the multiple battery cells 7 are first connected in series, in parallel, or in mixed series to form a battery module 6. The multiple battery modules 6 are then connected in series, in parallel, or in mixed series to form a whole, and are accommodated in the box.

[0146] The multiple battery cells 7 in the battery module 6 can be electrically connected via a busbar component to achieve parallel connection, series connection, or mixed connection of the multiple battery cells 7 in the battery module 6 .

[0147] Figure 4 This is a schematic diagram of the explosion structure of a battery cell provided in some embodiments of the present application. Figure 5 This is a schematic diagram of the matching structure of a first insulating member, a switching plate, and a second insulating member of a battery cell provided in some embodiments of the present application. Figure 6 for Figure 5 Exploded view of the structure shown.

[0148] Continue to refer Figures 4 to 6 The embodiment of the present application provides a battery cell 7, which includes a housing 10, an electrode terminal 20, an electrode assembly 30, a first insulating member 40, a transition piece 50, and a second insulating member 60. The housing 10 includes a first wall 11, and the electrode terminal 20 is disposed on the first wall 11. The electrode assembly 30 is accommodated in the housing 10, and the electrode assembly 30 includes an electrode body 31 and a tab 32. The tab 32 extends from the electrode body 31 toward the first end surface 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 transition piece 50 connects the electrode terminal 20 and the tab 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 transition piece 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 transition piece 50 and the electrode body 31. The tab 32 is connected to a region of the transition piece 50 that does not overlap with the second insulating member 60 in the thickness direction X.

[0149] Exemplarily, the housing 10 is a component used to create an internal environment for the battery cell 7. This internal environment can accommodate the electrode assembly 30, electrolyte, and other components. Optionally, the housing 10 can be made of, but is not limited to, metal or non-metallic materials. For example, metal materials can include copper, aluminum, or stainless steel; non-metallic materials can include polyethylene, polypropylene, or polyvinyl chloride.

[0150] In some examples, the housing 10 includes a shell and an end cover, wherein the shell has an opening and the end cover covers the opening.

[0151] The shell is a component used to cooperate with the end cap to form the internal environment of the battery cell 7. The internal environment formed can be used to accommodate the electrode assembly 30, electrolyte, and other components. The shell and the end cap can be independent components. An opening can be set in the shell, and the internal environment of the battery cell 7 is formed by closing the opening with the end cap. Optionally, the end cap and the shell can be integrated. Specifically, the end cap and the shell can form a common connection surface before other components are inserted into the shell. When the interior of the shell needs to be encapsulated, the end cap is closed with the shell. The shell can be of various shapes and sizes, such as rectangular, cylindrical, hexagonal, etc. Specifically, the shape of the shell can be determined according to the specific shape and size of the electrode assembly 30. The shell can be made of various materials. For example, the shell can be made of, but not limited to, metal or non-metallic materials. For example, metal materials can be copper, aluminum, or stainless steel; non-metallic materials can be polyethylene, polypropylene, or polyvinyl chloride.

[0152] The end cap refers to a component that covers the opening of the shell 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 shell to match the shell. 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 squeezed or collided, so that the battery cell 7 can have a higher structural strength and the reliability can also be improved. Functional components such as terminal groups can be provided on the end cap. The material of the end cap can also be various. For example, the end cap can be but not limited to being made of metal or non-metallic materials. For example, the metal material can be copper, aluminum or stainless steel, etc.; the non-metallic material can be polyethylene, polypropylene or polyvinyl chloride, etc.

[0153] Optionally, the end cap may be detachably connected to the housing or integrally formed on the housing. The end cap may be directly connected to the housing or secured to the housing via other components. For example, the end cap and the housing may be connected by, but is not limited to, welding, riveting, or bonding.

[0154] In some examples, the end cap is configured as the first wall 11 .

[0155] The electrode assembly 30 is the component within the battery cell 7 where the electrochemical reaction occurs. The electrode assembly 30 is primarily formed by winding or stacking positive and negative electrode sheets, with a separator typically 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 opposite ends of the main body. During the battery's charge and discharge processes, 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.

[0156] At least one electrode terminal 20 is disposed 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. The first electrode terminal and the second electrode terminal are spaced apart along the first direction Y.

[0157] 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 .

[0158] In some examples, the electrode tab 32 includes a positive electrode tab and a negative electrode tab, which are spaced apart along the first direction Y. The positive electrode tab is used to connect to the first electrode terminal, and the negative electrode tab is used to connect to the second electrode terminal.

[0159] In some examples, the battery cell 7 includes two adapter plates 50, which are configured as a first adapter plate and a second adapter plate. The first adapter plate and the second adapter plate are arranged at intervals along the first direction Y. The first adapter plate connects the first electrode terminal and the positive ear, and the second adapter plate connects the second electrode terminal and the negative ear.

[0160] In some examples, the battery cell 7 includes two second insulating members 60 , one of the two second insulating members 60 is disposed corresponding to the first adapter plate, and the other of the two second insulating members 60 is disposed corresponding to the second adapter plate.

[0161] 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. It can be understood that in the thickness direction X of the first wall 11, a portion of the first insulating member 40 is disposed between the first wall 11 and the adapter plate 50, or the entire first insulating member 40 is disposed between the first wall 11 and the adapter plate 50.

[0162] In some examples, a terminal connector 70 is provided on the adapter plate 50 . The terminal connector 70 protrudes from a surface of the adapter plate 50 facing the first wall 11 . The terminal connector 70 passes through the first insulating member 40 and is connected to the electrode terminal 20 .

[0163] Optionally, the first insulating member 40 may be, but is not limited to, a sheet-like structure, a film-layer structure, or a block-like structure.

[0164] Optionally, the first insulating member 40 may be made of, but is not limited to, polyethylene, polypropylene, polytetrafluoroethylene, polyimide, polyethylene terephthalate, rubber or other materials.

[0165] In some examples, the first insulating member 40 is connected to the first wall 11. The first insulating member 40 can be directly connected to the first wall 11 or can be restricted on the first wall 11 by other components.

[0166] 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 plate 50 and the electrode body 31. It can be understood that in the thickness direction X of the first wall 11, a portion of the second insulating member 60 is disposed between the adapter plate 50 and the electrode body 31, or the entire second insulating member 60 is disposed between the adapter plate 50 and the electrode body 31.

[0167] The tab 32 is connected to the region of the adapter plate 50 that does not overlap with the second insulating member 60 in the thickness direction X. In other words, the region of the adapter plate 50 that does not overlap with the second insulating member 60 in the thickness direction X is used to electrically connect to the tab 32 .

[0168] Optionally, the second insulating member 60 may be, but is not limited to, a sheet-like structure, a film-layer structure, or a block-like structure.

[0169] Optionally, the second insulating member 60 may be made of, but is not limited to, polyethylene, polypropylene, polytetrafluoroethylene, polyimide, polyethylene terephthalate, rubber or the like.

[0170] The above technical solution sets a second insulating member 60 between the adapter plate 50 and the electrode body 31. The second insulating member 60 can also space the adapter plate 50 and the electrode body 31 to insulate the adapter plate 50 from the electrode body 31, thereby reducing the risk of short circuit caused by contact between the adapter plate 50 and the electrode body 31, thereby effectively improving the reliability of the battery cell 7.

[0171] In some embodiments, the second insulating member 60 is disposed on at least one of the first insulating member 40 and the transfer plate 50 .

[0172] For example, the second insulating member 60 may be disposed on the first insulating member 40 , the second insulating member 60 may be disposed on the adapter plate 50 , or the second insulating member 60 may be disposed on both the first insulating member 40 and the adapter plate 50 .

[0173] It is understandable that the first insulating member 40 and the second insulating member 60 have similar structural characteristics, and it is relatively easy to arrange the second insulating member 60 on the first insulating member 40. In addition, the first insulating member 40 and the second insulating member 60 can be easily formed as one piece.

[0174] The structure of the adapter plate 50 is relatively simple, and the difficulty of placing the second insulating member 60 on the first insulating member 40 is relatively low. In addition, the second insulating member 60 needs to cover a portion of the adapter plate 50, and certain positioning operations are required during the installation process of the second insulating member 60 and the adapter plate 50. Therefore, placing the second insulating member 60 on the adapter plate 50 can also reduce the difficulty of positioning the second insulating member 60 and the adapter plate 50.

[0175] In this way, the above technical solution can reduce the difficulty of preparing the second insulating member 60 , simplify the preparation process, and help reduce the overall production cost of the battery cell 7 .

[0176] In some embodiments, the first insulating member 40 includes a first main portion 41 and a protrusion 42. The protrusion 42 protrudes from a side surface of the first main portion 41 facing the electrode body 31. The protrusion 42 is configured to abut against the first end surface 311. At least a portion of the first main portion 41 is disposed between the first wall 11 and the adapter plate 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 surface 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 surface 311.

[0177] 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 main body 41 and the electrode body 31, which can provide space for the setting of the adapter plate 50 and the second insulating member 60, thereby reducing the difficulty of assembling the adapter plate 50 and the second insulating member 60.

[0178] For example, the protrusion 42 can be detachably connected to the first main body 41 or integrally provided on the first main body 41. The protrusion 42 can be directly connected to the first main body 41 or be restrained on the first main body 41 by other components. As an example, the connection method between the protrusion 42 and the first main body 41 can be, but is not limited to, riveting or bonding.

[0179] In some examples, the first main body portion 41 and the protrusion 42 are an integrally formed structure.

[0180] On the one hand, there is no need to use an additional connection process to connect the first main body 41 and the protrusion 42, which simplifies the manufacturing process. At the same time, compared with connecting the first main body 41 and the protrusion 42 through an additional connection process, the integrated structure of the first main body 41 and the protrusion 42 has a higher connection strength.

[0181] 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. It can be understood that the surface of the second insulating member 60 facing the electrode body 31 does not extend beyond the surface of the protrusion 42 facing the electrode body 31 in the thickness direction X.

[0182] In other words, the second insulating member 60 is located in a receiving cavity formed between the first main body portion 41 and the electrode body 31 .

[0183] The above technical solution can reduce the occupation of the internal space of the battery cell 7 by the second insulating member 60 , which is beneficial to improving the energy density of the battery cell 7 .

[0184] 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 can effectively improve the utilization of the internal space of the battery cell 7 and the consistency of the internal structure of the battery cell 7.

[0185] Figure 7 This is a schematic diagram of the matching structure of the first insulating member, the adapter plate, and the second insulating member of another battery cell 7 provided in some embodiments of the present application. Figure 8 for Figure 7 Exploded view of the structure shown.

[0186] Continue to refer Figures 7 and 8 In some embodiments, the second insulating member 60 and the first insulating member 40 are an integrally formed structure, 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, and a portion of the adapter 50 is inserted into the slot 63.

[0187] The second insulating member 60 can separate the portion of the adapter 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 50 inserted into the slot 63 and the electrode body 31 .

[0188] The second insulating member 60 of the above-described technical solution is integrally formed with the first insulating member 40, resulting in a simple structure, which can simplify the manufacturing process and reduce costs. Furthermore, the integral formation of the second insulating member 60 and the first insulating member 40 can also help improve the flushness 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.

[0189] In some embodiments, a recess 64 is provided on the second insulating member 60, and the recess 64 is recessed relative to the second insulating member 60 along the thickness direction X and toward the side surface of the first insulating member 40, and the recess 64 and the side surface of the first insulating member 40 toward the electrode assembly 30 together define a slot 63.

[0190] The introduction of the recess 64 can increase the internal space of the slot 63 , making it easier for the adapter plate 50 to be inserted, thereby reducing the difficulty of assembling the adapter plate 50 .

[0191] In some embodiments, a first avoidance hole 65 is defined in the second insulating member 60 , and the first avoidance hole 65 penetrates the second insulating member 60 along the thickness direction X. A terminal connector 70 is defined on the adapter plate 50 , and the terminal connector 70 protrudes from a surface of the adapter plate 50 facing the first wall 11 and is connected to the electrode terminal 20 . The projection of the terminal connector 70 along the thickness direction X is located within the projection of the first avoidance hole 65 along the thickness direction X.

[0192] The first avoidance hole 65 is used to avoid the terminal connector 70. It is understandable that because the tab 32 is connected to the area of ​​the adapter plate 50 that does not overlap with the second insulating member 60 in the thickness direction X, the terminal connector 70 is often required to be disposed in the portion of the adapter plate 50 that is inserted into the slot 63. Furthermore, during the assembly process of the battery cell 7, the adapter plate 50 must first be inserted into the slot 63, and then the terminal connector 70 must be welded to the electrode terminal 20 on the side of the adapter plate 50 facing the second insulating member 60.

[0193] In this way, the above technical solution facilitates the welding operation between the terminal connector 70 and the electrode terminal 20 by introducing the first avoidance hole 65 , thereby reducing the connection difficulty between the terminal connector 70 and the electrode terminal 20 and improving production efficiency.

[0194] Optionally, the projection shape of the first avoidance hole 65 along the thickness direction X may be, but is not limited to, a circle, a rectangle, an ellipse or a polygon.

[0195] For example, the terminal connector 70 can be detachably connected to the adapter plate 50 or can be integrally provided on the adapter plate 50. The terminal connector 70 can be directly connected to the adapter plate 50 or can be restricted 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.

[0196] In some examples, the terminal connector 70 and the adapter plate 50 are integrally formed. This eliminates the need for an additional connection process to connect the terminal connector 70 and the adapter plate 50, simplifying the manufacturing process. Furthermore, compared to connecting the terminal connector 70 and the adapter plate 50 through an additional connection process, the integral structure provides a stronger connection between the terminal connector 70 and the adapter plate 50.

[0197] In some embodiments, the second insulating member 60 and the first insulating member 40 are independently formed, and the second insulating member 60 is disposed on the first insulating member 40 .

[0198] Exemplarily, the second insulating member 60 and the first insulating member 40 are independently formed, which means that the second insulating member 60 and the first insulating member 40 are formed separately by the same process or different processes, and then the second insulating member 60 and the first insulating member 40 are assembled and connected.

[0199] For example, the second insulating member 60 can be detachably connected to the first insulating member 40 or can be integrally provided on the first insulating member 40. The second insulating member 60 can be directly connected to the first insulating member 40 or can be restrained on 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.

[0200] The second insulating member 60 and the first insulating member 40 are formed independently, allowing for tailored designs based on the internal environment of the battery cell 7 and the structure of the adapter plate 50, thereby increasing overall design flexibility for the battery cell 7. The first and second insulating members 40 and 60 share similar structural characteristics, making it relatively easy to position the second insulating member 60 on the first insulating member 40.

[0201] Furthermore, during the assembly of the battery cell 7 , the above technical solution enables the adapter 50 to be welded to the electrode terminal 20 first, and then the second insulating member 60 to be assembled on the first insulating member 40 , thereby reducing the overall difficulty of preparing the battery cell 7 .

[0202] In this way, the above technical solution can not only reduce the difficulty of preparing the battery cell 7, but also improve the overall design flexibility of the battery cell 7.

[0203] Figure 9 This is a schematic diagram of the matching structure of the first insulating member, the adapter plate, and the second insulating member of another battery cell provided in some embodiments of the present application. Figure 10 for Figure 9 Exploded diagram of the structure shown, Figure 11 for Figure 9 A schematic structural diagram of the second insulating member in FIG. Figure 12 for Figure 10 Schematic diagram of the local enlarged structure at H.

[0204] Continue to refer 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 fitting portion 43 adapted to the plug-in portion 66, and the plug-in fitting portion 66 and the plug-in fitting portion 43 are plugged and fixed.

[0205] For example, the plug-in portion 66 may be a columnar structure, the plug-in fitting portion 43 may be a slot or hole that matches the columnar structure, and the plug-in portion 66 and the plug-in fitting portion 43 may be interference fit. Alternatively, the plug-in fitting portion 43 may be a columnar structure, and the plug-in portion 66 may be a slot or hole that matches the columnar structure.

[0206] The first insulating member 40 and the second insulating member 60 of the above technical solution are plugged and fixed, which has low assembly difficulty and helps to improve the overall assembly efficiency of the battery cell 7.

[0207] In some embodiments, the first insulating member 40 includes a first main portion 41 and a protrusion 42. The protrusion 42 protrudes from a side surface of the first main portion 41 facing the electrode body 31 and abuts the first end surface 311. At least a portion of the first main portion 41 is disposed between the first wall 11 and the adapter plate 50. The second insulating member 60 includes a second main portion 61 and a fixing portion 62. The fixing portion 62 is connected to the second main portion 61 and protrudes from a side surface of the second main portion 61 facing the first wall 11. At least a portion of the second main portion 61 is disposed between the adapter plate 50 and the electrode body 31. The plug-in portion 66 is disposed on the fixing portion 62, and the plug-in mating portion 43 is disposed on the first main portion 41.

[0208] 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 main body 41 and the electrode body 31, which can provide space for the setting of the adapter plate 50 and the second insulating member 60, thereby reducing the difficulty of assembling the adapter plate 50 and the second insulating member 60.

[0209] The plug-in portion 66 is disposed on the fixing portion 62, and the plug-in mating portion 43 is disposed on the first main portion 41, so that the second insulating member 60 is connected to the first main portion 41 of the first insulating member 40 via the fixing portion 62. The fixing portion 62 protrudes from the side surface of the second main portion 61 facing the first wall 11, forming a cavity between the second main portion 61 and the first main portion 41. The cavity provides space for the installation of the adapter plate 50, thereby reducing the difficulty of assembling the adapter plate 50.

[0210] For example, the fixing portion 62 may be detachably connected to the second main portion 61 or may be integrally provided on the second main portion 61. The fixing portion 62 may be directly connected to the second main portion 61 or may be restrained on the second main portion 61 by other components. As an example, the fixing portion 62 and the second main portion 61 may be connected by, but is not limited to, riveting or bonding.

[0211] In some examples, the fixing portion 62 and the second main body portion 61 are an integrally formed structure.

[0212] On the one hand, there is no need to use an additional connection process to connect the fixing portion 62 and the second main portion 61, which simplifies the manufacturing process. At the same time, compared with connecting the fixing portion 62 and the second main portion 61 through an additional connection process, the fixing portion 62 and the second main portion 61 in an integrated structure have a higher connection strength.

[0213] The above technical solution can effectively reduce the difficulty of assembling the adapter plate 50 and improve the production efficiency and quality of the battery cell 7.

[0214] In some embodiments, the adapter 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 the first direction Y. The second insulating member 60 includes two fixing portions 62 , which are respectively connected to the ends of the second main body 61 along the second direction Z. The first direction Y, the second direction Z, and the thickness direction X are perpendicular to each other.

[0215] For example, the first connection portion 51 refers to the portion where the adapter plate 50 connects to the electrode terminal 20, and the second connection portion 52 refers to the portion where the adapter plate 50 connects to the tab 32. The first connection portion 51 and the second connection portion 52 may be spaced apart along the first direction Y, or they may be adjacent to each other along the first direction Y. The first direction Y may be understood as the length direction of the first insulating member 40, and the second direction Z may be understood as the width direction of the first insulating member 40.

[0216] In some examples, a terminal connector 70 is provided on the adapter plate 50 . The terminal connector 70 protrudes from a 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 the first connecting portion 51 .

[0217] It can be understood that since the fixing portion 62 is connected to the first main body portion 41, the adapter plate 50 is located between the first main body portion 41 and the second main body portion 61, and the second connecting portion 52 is located on one side of the first connecting portion 51 along the first direction Y, the second insulating member 60 needs to be set corresponding to the first connecting portion 51.

[0218] Thus, the above technical solution can further improve the connection firmness of the second insulating member 60 by providing two fixing portions 62. Furthermore, by connecting the two fixing portions 62 to the two ends of the second main body 61 along the second direction Z, after the second insulating member 60 is assembled to the first insulating member 40, the risk of interference between the fixing portions 62 and the second connecting portion 52, which could lead to failure of the connection between the second connecting portion 52 and the tab 32, can be reduced.

[0219] Of course, the number of the fixing parts 62 can also be one, three, four or more, which can be selected according to the actual application environment.

[0220] Figure 13 This is a structural diagram of a first insulating member, a switching plate, and a second insulating member of another battery cell provided in some embodiments of the present application, wherein the second insulating member is in a first preset position. Figure 14 This is a structural diagram of a first insulating member, a switching plate, and a second insulating member of another battery cell provided in some embodiments of the present application, wherein the second insulating member is in a second preset position. Figure 15 for Figure 14 Exploded diagram of the structure shown, Figure 16 for Figure 15 Schematic diagram of the local enlarged structure at K, Figure 17 for Figure 15 Schematic diagram of the local enlarged structure at L, Figure 18 for Figure 15 Schematic diagram of the local enlarged structure at M, Figure 19 for Figure 15 Schematic diagram of the local enlarged structure at N.

[0221] Continue to refer 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.

[0222] For example, before assembling the adapter plate 50 and the first insulating member 40, the second insulating member 60 is first moved to a first preset position to avoid the adapter plate 50 and provide installation space for the adapter plate 50. After the adapter plate 50 is installed, the second insulating member 60 is moved to a second preset position, covering the side of the adapter plate 50 facing away from the first wall 11, so that in the finished battery cell 7, at least a portion of the second insulating member 60 is disposed between the adapter plate 50 and the electrode body 31.

[0223] In some examples, the second insulating member 60 is slidably connected to the first insulating member 40 , and the second insulating member 60 slides relative to the first insulating member 40 so that the second insulating member 60 can cover or avoid the adapter 50 .

[0224] The technical solution can reduce the assembly difficulty of the adapter piece 50 while improving the integrity of the first insulating piece 40 and the second insulating piece 60.

[0225] In some embodiments, the second insulating piece 60 is rotatably connected to the first insulating piece 40. The second insulating piece 60 is rotatably connected to the first insulating piece 40, which has a relatively simple structure and low installation difficulty, thereby helping to reduce the overall cost of the battery monomer 7.

[0226] In some embodiments, a friction piece is arranged at the rotatable connection between the second insulating piece 60 and the first insulating piece 40, and the friction piece is used to increase the friction at the rotatable connection between the second insulating piece 60 and the first insulating piece 40. The stability of the second insulating piece 60 when in the second preset position is improved.

[0227] In some embodiments, the first insulating piece 40 includes a first main body part 41 and a protruding part 42 protruding from a side surface of the first main body part 41 toward the electrode main body 31, the protruding part 42 abuts against the first end surface 311, and at least part of the first main body part 41 is arranged between the first wall 11 and the adapter piece 50. The protruding part 42 is arranged along the first direction Y with the second insulating piece 60, and the second insulating piece 60 is located on the side of the protruding part 42 close to the adapter piece 50. The second insulating piece 60 is rotatably connected to the protruding part 42, and the rotation axis of the second insulating piece 60 is parallel to the first direction Y, and the first direction Y intersects the thickness direction X.

[0228] The protruding part 42 abuts against the first end surface 311 of the electrode main body 31, so that the first main body part 41 and the electrode main body 31 can form a receiving cavity, which can provide space for the arrangement of the adapter piece 50 and the second insulating piece 60, thereby reducing the assembly difficulty of the adapter piece 50 and the second insulating piece 60.

[0229] The protruding part 42 is arranged along the first direction Y with the second insulating piece 60, and the second insulating piece 60 is located on the side of the protruding part 42 close to the adapter piece 50. The rotation axis of the second insulating piece 60 is parallel to the first direction Y, which can reduce the influence of the protruding part 42 on the rotation of the second insulating piece 60.

[0230] The second insulating piece 60 is rotatably connected to the protruding part 42. Since the protruding part 42 protrudes from a side surface of the first main body part 41 toward the electrode main body 31, the protruding part 42 can provide more space for the rotatable connection of the second insulating piece 60 relative to the first main body part 41, thereby reducing the installation difficulty of the second insulating piece 60.

[0231] In some embodiments, the second insulating piece 60 is provided with a rotating part 67, the protruding part 42 is provided with a rotating matching part 44 matched with the rotating part 67, and the rotating part 67 is inserted into the rotating matching part 44. The structure is simple, which can reduce the cost of the battery monomer 7.

[0232] For example, the rotating portion 67 may be a cylindrical structure, the rotating fitting portion 44 may be a groove or hole that matches the cylindrical structure, and the plug-in portion 66 may be clearance-fitted with the plug-in fitting portion 43. Alternatively, the rotating fitting portion 44 may be a cylindrical structure, and the rotating portion 67 may be a groove or hole that matches the cylindrical structure.

[0233] In some embodiments, a snap-fit ​​portion 68 is provided on the second insulating member 60 , and a snap-fit ​​portion 45 adapted to the snap-fit ​​portion 68 is provided on the protrusion 42 . The snap-fit ​​portion 68 is used to snap-fit ​​with the snap-fit ​​portion 45 to fix the first insulating member 40 and the second insulating member 60 .

[0234] For example, the snap-fitting portion 68 may be a block structure, and the snap-fitting portion 45 may be a groove or hole that matches the block structure; or the snap-fitting portion 45 may be a block structure, and the snap-fitting portion 68 may be a groove or hole that matches the block structure.

[0235] After the adapter plate 50 is installed, the second insulating member 60 is rotated to be located at the second preset position, and the engaging portion 68 is engaged with the engaging portion 45 to securely connect the first insulating member 40 and the second insulating member 60 .

[0236] The above technical solution can improve the stability of the second insulating member 60 in the battery cell 7, so as to reduce the risk of insulation failure caused by movement of the second insulating member 60.

[0237] In some embodiments, the second insulating member 60 includes a first part 60a and a second part 60b, and the first part 60a and the second part 60b are spaced apart and arranged opposite to each other along the second direction Z. The first part 60a and the second part 60b are both 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.

[0238] For example, the first portion 60a and the second portion 60b may be made of the same material, shape, and size, or may be different. In some examples, the first portion 60a and the second portion 60b may be made of the same material, shape, and size, which helps simplify the manufacturing process of the insulating member and reduce costs.

[0239] In some examples, the first portion 60a and the second portion 60b rotate in opposite directions to open and close. Specifically, the first portion 60a rotates clockwise to move to a first preset position, while the second portion 60b rotates counterclockwise to move to the first preset position, thereby avoiding the adapter plate 50 and providing installation space for the adapter plate 50. The first portion 60a rotates counterclockwise to move to a second preset position, while the second portion 60b rotates clockwise to move to the second preset position, so that the first portion 60a and the second portion 60b cover the side of the adapter plate 50 facing away from the first wall 11, so that in the finished battery cell 7, at least a portion of the second insulating member 60 is disposed between the adapter plate 50 and the electrode body 31.

[0240] The first portion 60 a and the second portion 60 b of the above technical solution can rotate independently of each other, which can further improve the flexibility of the adapter plate 50 during assembly.

[0241] In some embodiments, the second insulating member 60 and the first insulating member 40 are independently formed, and the second insulating member 60 is disposed on the transfer plate 50 .

[0242] For example, the second insulating member 60 can be detachably connected to the adapter plate 50 or can be integrally provided on the adapter plate 50. The second insulating member 60 can be directly connected to the adapter plate 50 or can be restrained on the adapter plate 50 by other components. As an example, the connection method between the second insulating member 60 and the adapter plate 50 can be, but is not limited to, bolt connection, plug connection, riveting, or bonding.

[0243] The structure of the adapter plate 50 is relatively simple, and the difficulty of placing the second insulating member 60 on the first insulating member 40 is relatively low. In addition, the second insulating member 60 needs to cover a portion of the adapter plate 50, and certain positioning operations are required during the installation process of the second insulating member 60 and the adapter plate 50. Therefore, placing the second insulating member 60 on the adapter plate 50 can also reduce the difficulty of positioning the second insulating member 60 and the adapter plate 50.

[0244] Figure 20 A schematic diagram of the matching structure of a first insulating member, a switching plate, and a second insulating member of a battery cell provided in some embodiments of the present application is provided. Figure 21 for Figure 20 Exploded view of the structure shown.

[0245] Continue to refer Figures 20 to 21 In some embodiments, the second insulating member 60 covers a portion of the transfer plate 50 .

[0246] Exemplarily, the second insulating member 60 wrapping a portion of the adapter tab 50 means that the second insulating member 60 wraps the portion of the adapter tab 50 in a form similar to a wrapped package, while also needing to expose a portion of the adapter tab 50 for connection with the tab 32 and the electrode terminal 20.

[0247] In the assembly process of the battery monomer 7, the second insulating member 60 and the adapter tab 50 can be assembled together, without the need for separate assembly of the second insulating member 60 and the adapter tab 50, thereby reducing the overall assembly steps of the battery monomer 7 and helping to improve assembly efficiency.

[0248] Optionally, the second insulating member 60 can be, but is not limited to, provided on the adapter tab 50 by means of adhesion, coating or spraying, etc.

[0249] The second insulating member 60 of the above technical solution is provided on the adapter tab 50 in a wrapped form, which not only improves the stability of the second insulating member 60, but also reduces the overall assembly complexity of the battery monomer 7.

[0250] In some embodiments, the second insulating member 60 is provided with a second avoiding hole 69, which penetrates the second insulating member 60 along the thickness direction X of the first insulating member 40. The adapter tab 50 is provided with a terminal connecting member 70, which protrudes from the side surface of the adapter tab 50 facing the first wall 11 and is connected to the electrode terminal 20, and the projection of the terminal connecting member 70 along the thickness direction X is located within the projection of the second avoiding hole 69 along the thickness direction X.

[0251] The second avoiding hole 69 is used to avoid the terminal connecting member 70. It can be understood that, since the tab 32 is connected to the region of the adapter tab 50 which does not overlap with the second insulating member 60 along the thickness direction X, the terminal connecting member 70 often needs to be provided on the portion of the adapter tab 50 wrapped by the second insulating member 60.

[0252] In this way, the above technical solution introduces the second avoiding hole 69, which facilitates the welding operation of the terminal connecting member 70 and the electrode terminal 20, thereby reducing the connection difficulty between the terminal connecting member 70 and the electrode terminal 20 and improving the production efficiency.

[0253] Optionally, the projection shape of the second avoiding hole 69 along the thickness direction X can be, but is not limited to, circular, rectangular, elliptical or polygonal, etc.

[0254] As shown in FIG. 1, in some embodiments, the second insulating member 60 is attached to the side surface of the adapter tab 50 facing the electrode body 31. Figures 5 and 6

[0255] Exemplarily, the attachment refers to adhesion or coating or spraying.

[0256] ​The above technical solution can reduce the difficulty of preparing the second insulating member 60 , simplify the preparation process, improve the assembly efficiency of the second insulating member 60 , and help reduce the overall production cost of the battery cell 7 .

[0257] In some embodiments, the melting point of the second insulating member 60 is greater than the melting point of the first insulating member 40 .

[0258] The melting point of the second insulating member 60 is greater than that of the first insulating member 40 , so that the second insulating member 60 has stronger heat resistance than the first insulating member 40 . In a high temperature environment, the second insulating member 60 is less likely to melt.

[0259] The above technical solution sets a second insulating member 60 with a higher melting point between the electrode body 31 and the adapter plate 50. When the battery cell 7 is heated, the second insulating member 60 is not easy to melt. Even if the first insulating member 40 softens and the supporting force decreases, the second insulating member 60 can still space the adapter plate 50 and the electrode body 31 to insulate the adapter plate 50 from the electrode body 31, which can further improve the reliability of the battery cell 7.

[0260] 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 that of the first surfaces. The first direction Y, the second direction Z, and the thickness direction X are perpendicular to each other. The portion of the second insulating member 60 located between the adapter plate 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 plate 50 in the second direction Z, or the two side edges of the second insulating member 60 in the second direction Z are flush with the two side edges of the adapter plate 50 in the second direction Z.

[0261] For example, the area of ​​the second surface is greater than that 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 between the adapter 50 and the electrode body 31 in the thickness direction X refers to the portion of the second insulating member 60 used to separate the insulating adapter 50 and the electrode body 31.

[0262] It is understandable that the electrode assembly 30 will expand to a certain extent during the cycle, and the expansion of the large surface of the electrode assembly 30 is relatively large. In other words, the expansion of the electrode assembly 30 along the second direction Z is relatively large. Therefore, after the electrode assembly 30 expands, the middle region of the electrode assembly 30 will be slightly concave relative to the large surface region. In other words, in the second direction Z, the middle region of the first end surface 311 will be slightly concave relative to the edges of the first end surface 311 near the two second surfaces. This increases the risk of overlapping of the two side edges of the adapter 50 along the second direction Z with the electrode body 31, resulting in a short circuit.

[0263] In this way, the second insulating member 60 of the above technical solution can focus on insulating and protecting the two side edges of the adapter plate 50 along the second direction Z, thereby further reducing the risk of short circuit caused by contact between the adapter plate 50 and the electrode body 31, and further improving the reliability of the battery cell 7.

[0264] In some embodiments, the volume 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.

[0265] Illustratively, when the volume 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°C, 120°C, 140°C, 160°C, 180°C, 200°C, 250°C, 300°C, 350°C, 400°C, 450°C, 500°C, etc.

[0266] When the volume energy density of the battery cell 7 is greater than 390Wh / L, the melting point of the second insulating member 60 may be, but is not limited to, 150°C, 190°C, 200°C, 220°C, 260°C, 280°C, 300°C, 320°C, 360°C, 380°C, 400°C, 450°C, 500°C, 550°C,

[0267] 600℃, 700℃, 800℃, etc.

[0268] It is understood that the higher the volumetric energy density of the battery cell 7, the higher the temperature of the battery cell 7 after thermal runaway occurs, and the higher the melting point requirement for the second insulating member 60. The lower the volumetric energy density of the battery cell 7, the lower the temperature of the battery cell 7 after thermal runaway occurs, and the lower the melting point requirement for the second insulating member 60.

[0269] The above technical solution can reduce the heat resistance overflow of the second insulating member 60 and reduce costs while meeting the insulation protection requirements by specifically setting the melting point of the second insulating member 60 according to the different volume energy densities of the battery cells 7.

[0270] 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 150°C; alternatively, 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 200°C. By increasing the lower limit of the melting point of the second insulating member 60, the insulation protection effect can be further improved.

[0271] According to some embodiments of the present application, the present application further provides a battery device, comprising a battery cell 7 according to any of the above solutions.

[0272] According to some embodiments of the present application, the present application further provides an electrical device, comprising a battery cell 7 or a battery device according to any of the above schemes, wherein the battery cell 7 or the battery device is used to store or provide electrical energy.

[0273] Unless otherwise specified, all embodiments and optional embodiments of the present application can be combined with each other to form a new technical solution. All technical features and optional technical features of the present application can be combined with each other to form a new technical solution.

[0274] In order to better understand the battery cell 7 provided in the embodiment of the present application, based on the same inventive concept, an embodiment of the above-mentioned battery cell 7 in actual application is provided here for illustration.

[0275] An embodiment of the present application provides a battery cell 7, which includes a shell 10, an electrode terminal 20, an electrode assembly 30, a first insulating member 40, a transition piece 50, and a second insulating member 60. The shell 10 includes a first wall 11, and the electrode terminal 20 is arranged on the first wall 11. The electrode assembly 30 is accommodated in the shell 10, and the electrode assembly 30 includes an electrode body 31 and a tab 32, and the tab 32 is extended from the electrode body 31 toward the first end surface 311 of the first wall 11. The first insulating member 40 is placed on the side of the first wall 11 facing the electrode assembly 30. The transition piece 50 connects the electrode terminal 20 and the tab 32. In the thickness direction X of the first wall 11, at least a portion of the first insulating member 40 is arranged between the first wall 11 and the transition piece 50. The second insulating member 60 is arranged on at least one of the first insulating member 40 and the transition piece 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 plate 50 and the electrode body 31 , and the tab 32 is connected to a region of the adapter plate 50 that does not overlap with the second insulating member 60 in the thickness direction X.

[0276] The first insulating member 40 includes a first main portion 41 and a protrusion 42. The protrusion 42 protrudes from a side surface of the first main portion 41 facing the electrode body 31. The protrusion 42 abuts the first end surface 311. At least a portion of the first main portion 41 is disposed between the first wall 11 and the adapter plate 50. The side surface of the protrusion 42 facing the electrode body 31 is flush with the side surface of the second insulating member 60 facing the electrode body 31.

[0277] The above technical solution sets a second insulating member 60 between the adapter plate 50 and the electrode body 31. The second insulating member 60 can also space the adapter plate 50 and the electrode body 31 to insulate the adapter plate 50 from the electrode body 31, thereby reducing the risk of short circuit caused by contact between the adapter plate 50 and the electrode body 31, thereby effectively improving the reliability of the battery cell 7.

[0278] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery cell, characterized in that: include: a housing comprising a first wall; an electrode terminal, disposed on the first wall; an electrode assembly housed in the housing, the electrode assembly comprising an electrode body and a tab, the tab extending from the electrode body toward the first end surface of the first wall; a first insulating member, disposed on a side of the first wall facing the electrode assembly; a transition piece connecting the electrode terminal and the tab, wherein at least a portion of the first insulating member is disposed between the first wall and the transition piece in a thickness direction of the first wall; The second insulating member is at least partially disposed between the adapter and the electrode body in the thickness direction of the first wall, and the electrode tab is connected to an area of ​​the adapter 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 member is disposed on at least one of the first insulating member and the adapter.

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

4. The battery cell according to claim 3, characterized in that A surface of the protrusion facing the electrode body is flush with a surface of the second insulating member facing the electrode body.

5. The battery cell according to claim 1, characterized in that The second insulating member and the first insulating member are an integrally formed structure. At least a portion of the second insulating member is located on a 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 is inserted into the slot.

6. The battery cell according to claim 5, characterized in that The second insulating member is provided with a recessed portion, which is sunken relative to the second insulating member along the thickness direction and toward one side surface of 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, characterized in that A first avoidance hole is formed on the second insulating member, and the first avoidance hole passes through the second insulating member along the thickness direction; A terminal connector is provided on the adapter plate, which 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 avoidance hole along the thickness direction.

8. The battery cell according to claim 1, wherein: The second insulating member and the first insulating member are formed independently, and the second insulating member is disposed on the first insulating member.

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

10. The battery cell according to claim 9, characterized in that The first insulating member includes a first main body and a convex portion, the convex portion protruding from a side surface of the first main body facing the electrode body, the convex portion abutting against the first end surface, and at least a portion of the first main body is disposed between the first wall and the adapter plate; The second insulating member includes a second main body portion and a fixing portion, wherein the fixing portion is connected to the second main body portion and protrudes from a side surface of the second main body portion facing the first wall, and at least a portion of the second main body portion is disposed between the adapter plate and the electrode body; The plug-in portion is arranged on the fixing portion, and the plug-in fitting portion is arranged on the first main body portion.

11. The battery cell according to claim 10, characterized in that The adapter plate includes a first connecting portion and a second connecting portion, the first connecting portion is connected to the electrode terminal, the second connecting portion is connected to the electrode tab, and the first connecting portion and the second connecting portion are arranged along a first direction; The second insulating member includes two fixing portions, and the two fixing portions are respectively connected to two ends of the second main body along the second direction. The first direction, the second direction and the thickness direction are perpendicular to each other.

12. The battery cell according to claim 8, characterized in that The second insulating member is movably connected to the first insulating member so that the second insulating member can cover or avoid the adapter plate.

13. The battery cell according to claim 12, characterized in that: The second insulating member is rotatably connected to the first insulating member.

14. The battery cell according to claim 13, characterized in that The first insulating member includes a first main body and a convex portion, the convex portion protruding from a side surface of the first main body facing the electrode body, the convex portion abutting against the first end surface, and at least a portion of the first main body is disposed between the first wall and the adapter plate; The protrusion and the second insulating member are arranged along the first direction, and the second insulating member is located on the side of the protrusion close to the adapter plate. 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, and the first direction intersects with the thickness direction.

15. The battery cell according to claim 14, characterized in that The second insulating member is provided with a clamping portion, the protrusion is provided with a clamping fitting portion adapted to the clamping portion, and the clamping portion is used to clamp with the clamping fitting portion to fix the first insulating member and the second insulating member.

16. The battery cell according to claim 14, characterized in that The second insulating member includes a first part and a second part, the first part and the second part are spaced apart and arranged opposite to each other along the second direction, the first part and the second part are both rotatably connected to the protrusion, and the first direction, the second direction and the thickness direction are perpendicular to each other.

17. The battery cell according to claim 1, characterized in that The second insulating member and the first insulating member are formed independently, and the second insulating member is arranged on the adapter plate.

18. The battery cell according to claim 17, characterized in that The second insulating member covers a portion of the adapter.

19. The battery cell according to claim 18, characterized in that A second avoidance hole is formed on the second insulating member, and the second avoidance hole passes through the second insulating member along the thickness direction of the first insulating member; A terminal connector is provided on the adapter plate, which 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 avoidance hole along the thickness direction.

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

21. The battery cell according to claim 1, characterized in that The melting point of the second insulating member is greater than the melting point of the first insulating member.

22. The battery cell according to claim 1, characterized in that 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, the two second surfaces are arranged opposite to each other along a second direction, the area of ​​the second surfaces is larger than that of the first surfaces, and the first direction, the second direction and the thickness direction are perpendicular to each other; A portion of the second insulating member located between the adapter plate and the electrode body in the thickness direction is extended along the second direction; In the second direction, the second insulating member exceeds two side edges of the adapter plate along the second direction, or two side edges of the second insulating member along the second direction are flush with two side edges of the adapter plate along the second direction.

23. The battery cell according to claim 1, characterized in that The volume energy density of the battery cell is less than or equal to 390Wh / L, and the melting point of the second insulating member 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 member is greater than or equal to 150°C.

24. The battery cell according to claim 23, characterized in that The volume energy density of the battery cell is less than or equal to 390Wh / L, and the melting point of the second insulating member 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 member is greater than or equal to 200°C.

25. A battery device, characterized in that: The invention comprises a plurality of battery cells according to any one of claims 1 to 24.

26. An electrical device, characterized in that: The battery cell according to any one of claims 1 to 24 or the battery device according to claim 25 is used to store or provide electrical energy.

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