Battery cell, battery device, and electric device

Abstract

The application provides a battery monomer, a battery device and a power utilization equipment. The battery monomer comprises a shell, an electrode assembly, an end cover assembly and a connecting assembly. The shell has an opening. The electrode assembly is accommodated in the shell. The end cover assembly comprises an end cover and an insulating piece. The end cover covers the opening, and the insulating piece is arranged on the side of the end cover facing the electrode assembly. The connecting assembly is arranged between the end cover and the insulating piece. The end cover and the insulating piece are connected through the connecting assembly. The connecting assembly comprises a first connecting piece and a second connecting piece. The number of the first connecting pieces is plural. The plural first connecting pieces are distributed along the circumference of the end cover assembly at intervals, and the plural first connecting pieces are arranged around the second connecting piece. The application is beneficial to improving the reliability of the battery monomer.

Description

Technical Field

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

[0002] Battery cells are widely used in electronic devices such as mobile phones, laptops, electric vehicles, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes, and power tools. Battery cells can include nickel-cadmium battery cells, nickel-metal hydride battery cells, lithium-ion battery cells, and secondary alkaline zinc-manganese battery cells, among others.

[0003] In the development of battery technology, how to improve the reliability of individual battery cells is a technical problem that urgently needs to be solved. Utility Model Content

[0004] In view of the above problems, this application provides a battery cell, a battery device, and an electrical device, which helps to improve the reliability of the battery cell.

[0005] In a first aspect, this application provides a battery cell, comprising: a housing having an opening; an electrode assembly housed within the housing; an end cap assembly including an end cap and an insulating member, the end cap closing onto the opening, and the insulating member disposed on the side of the end cap facing the electrode assembly; and a connecting assembly disposed between the end cap and the insulating member, the end cap and the insulating member being connected by the connecting assembly, the connecting assembly including a first connecting member and a second connecting member, the number of first connecting members being multiple, the multiple first connecting members being distributed circumferentially at intervals along the end cap assembly, and the multiple first connecting members being disposed around the second connecting member.

[0006] In some embodiments of the first aspect, the end cap and the insulating member are fixedly connected by a connecting assembly to form an end cap assembly. By configuring the connecting assembly to include a plurality of first connecting members spaced apart circumferentially along the end cap assembly, and a second connecting member surrounded by the plurality of first connecting members, it is beneficial to improve the connection strength between the end cap and the insulating member, effectively prevent deformation of the end cap assembly, thereby improving the reliability of the end cap assembly, and further improving the reliability of the battery cell.

[0007] In some embodiments, there are multiple second connectors, which are spaced apart. This arrangement further enhances the connection strength between the end cap and the insulating component, preventing deformation of the end cap assembly and thus improving the reliability of the battery cell.

[0008] In some embodiments, the orthographic projections of the first connector and the second connector intersect in the same projection plane perpendicular to the first direction; and / or, the orthographic projections of the first connector and the second connector intersect in the same projection plane perpendicular to the second direction; the first direction and the second direction intersect.

[0009] In the above technical solution, the staggered arrangement of the first connector and the second connector can effectively avoid stress concentration in the end cap assembly, prevent interference between them during assembly, and improve the uniform distribution of the connection position between the end cap and the insulating component, thereby improving the structural strength of the end cap assembly.

[0010] In some embodiments, the first connector includes a first connecting post disposed on the insulating member, and the end cap has a first groove that matches the first connecting post, with the first connecting post being received in the first groove; the second connector includes a second connecting post disposed on the insulating member, and the end cap has a second groove that matches the second connecting post, with the second connecting post being received in the second groove.

[0011] By using the above method, the connection tightness and compactness between the end cap and the insulating component can be improved.

[0012] In some embodiments, the first connecting post is a first hot-melt post, and / or the second connecting post is a second hot-melt post.

[0013] In the above technical solution, the end cap and the insulating component can be connected by a hot-melt process, which facilitates assembly, improves the assembly efficiency of the end cap assembly, reduces the production cost of the battery cell, and makes the connection between the end cap and the insulating component more compact.

[0014] In some embodiments, at least a portion of the cross-sectional area of ​​the first groove tends to increase in the direction from the insulating member to the end cap, and / or at least a portion of the cross-sectional area of ​​the second groove tends to increase.

[0015] By setting it in the above manner, it is beneficial to improve the stability of the first connecting post being accommodated in the first groove, and to improve the stability of the second connecting post being accommodated in the second groove, thereby improving the connection strength between the insulating component and the end cap.

[0016] In some embodiments, in the first direction, the distance between the midpoint of the second connector and the midpoint of the adjacent first connector is between 5 mm and 25 mm.

[0017] The above-mentioned arrangement is reasonable and can not only avoid interference between the first and second connectors during assembly, but also help ensure the connection strength between the end cap and the insulating component.

[0018] In some embodiments, in the first direction, the distance between the midpoint of the second connector and the midpoint of the adjacent first connector is between 15 mm and 20 mm. This arrangement helps to further improve the connection strength between the end cap and the insulating component.

[0019] In some embodiments, among two first connectors located on the same side of the second connector along the first direction and adjacent to the second connector, the distance between the midpoint of one first connector and the midpoint of the other first connector in the second direction is W, and the distance between the midpoint of any one of the two adjacent first connectors and the midpoint of the second connector in the second direction is C, where 1 / 4 ≤ C / W ≤ 3 / 4, and the first direction intersects the second direction.

[0020] The above-mentioned arrangement is reasonable and can not only avoid interference between the first and second connectors during assembly, but also help ensure the connection strength between the end cap and the insulating component.

[0021] In some embodiments, 3 / 8 ≤ C / W ≤ 5 / 8. This arrangement helps to further improve the connection strength between the end cap and the insulation.

[0022] In some embodiments, the end cap assembly is provided with a first electrode lead-out portion and a second electrode lead-out portion along a first direction, and a first connector and a second connector are provided between the first electrode lead-out portion and the second electrode lead-out portion.

[0023] In the above technical solution, since a first connector and a second connector are provided between the first electrode lead-out portion and the second electrode lead-out portion, deformation of the portion of the insulating component located between the first electrode lead-out portion and the second electrode lead-out portion can be avoided, which is beneficial to improving the connection strength between the end cap and the insulating component, thereby improving the reliability of the end cap assembly.

[0024] In some embodiments, in the first direction, among the plurality of first connectors located between the first electrode lead-out portion and the second electrode lead-out portion, at least one of the first connectors has a size of L1, wherein 3mm≤L1≤80mm.

[0025] In the above technical solution, by increasing the size of at least one first connector to increase the connection area between the end cap and the insulating component, it is beneficial to improve the connection strength between the end cap and the insulating component.

[0026] In some embodiments, 25mm ≤ L1 ≤ 80mm. This configuration improves the connection strength between the end cap and the insulation while facilitating manufacturing.

[0027] In some embodiments, 25mm ≤ L1 ≤ 30mm. This configuration can improve the connection strength between the end cap and the insulation while reducing costs.

[0028] In some embodiments, the end cap assembly further includes a liquid injection hole disposed between the first electrode lead-out portion and the second electrode lead-out portion. In the same projection plane perpendicular to the second direction, the orthographic projection of the liquid injection hole falls into the orthographic projection of the first connector with a size of L1, and the first direction intersects the second direction. This arrangement results in a reasonable layout.

[0029] In some embodiments, 3mm ≤ L1 < 25mm. This configuration can improve the connection strength between the end cap and the insulation while reducing costs.

[0030] In some embodiments, 10mm ≤ L1 ≤ 15mm. This configuration can improve the connection strength between the end cap and the insulation while further reducing costs.

[0031] In some embodiments, the end cap assembly further includes a liquid injection hole disposed between the first electrode lead-out portion and the second electrode lead-out portion. In the same projection plane perpendicular to the second direction, the orthographic projection of the liquid injection hole intersects with the orthographic projection of the first connector with a size of L1, and the first direction intersects the second direction. This arrangement results in a reasonable layout.

[0032] In some embodiments, in a first direction, a first connector is provided on the side of the first electrode lead-out that is away from the second electrode lead-out, and a first connector is provided on the side of the second electrode lead-out that is away from the first electrode lead-out.

[0033] The above technical solution has a reasonable layout, which can improve the structural strength of the end cap assembly on both sides of its length direction.

[0034] In some embodiments, the end cap assembly further includes a liquid injection hole disposed between the first electrode lead-out portion and the second electrode lead-out portion. In the same projection plane perpendicular to the second direction, the orthographic projection of the second connector and the orthographic projection of the liquid injection hole intersect, and the first direction intersects the second direction. This arrangement results in a reasonable layout.

[0035] In some embodiments, in the first direction, at least one second connector has a dimension of L2, wherein 3mm≤L2≤25mm.

[0036] In the above technical solution, by increasing the size of at least one second connector to increase the connection area between the end cap and the insulating component, it is beneficial to improve the connection strength between the end cap and the insulating component.

[0037] In some embodiments, 10mm ≤ L2 ≤ 15mm. This configuration can improve the connection strength between the end cap and the insulation while further reducing costs.

[0038] In a second aspect, this application provides a battery device including a plurality of battery cells provided according to any embodiment of the first aspect.

[0039] Thirdly, this application provides an electrical device, including a battery device according to any embodiment of the second aspect or a plurality of battery cells according to any embodiment of the first aspect, wherein the battery cells or battery device are used to store or provide electrical energy.

[0040] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

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

[0042] Figure 1 This application provides structural schematic diagrams of vehicles for some embodiments;

[0043] Figure 2 This application provides an exploded structural diagram of a battery device according to some embodiments.

[0044] Figure 3 This application provides an exploded structural diagram of a single battery cell for some embodiments.

[0045] Figure 4 This application provides a schematic diagram of the structure of a battery cell end cap assembly according to some embodiments;

[0046] Figure 5 A partial cross-sectional view of a battery cell end cap assembly provided for some embodiments of this application;

[0047] Figure 6 for Figure 5 Enlarged view of point P in the middle;

[0048] Figure 7 This application provides a schematic diagram of the structure of a battery cell end cap according to some embodiments;

[0049] Figure 8 This application provides a schematic diagram of the structure of an insulating component in a battery cell, as shown in some embodiments.

[0050] Figure 9 This application provides a schematic diagram of the structure of a battery cell end cap assembly in some other embodiments.

[0051] Figure 10 This application provides a schematic diagram of the structure of a battery cell end cap assembly in some other embodiments.

[0052] Figure 11 A schematic diagram of the structure of a battery cell end cap assembly provided in some embodiments of this application;

[0053] Figure 12 A schematic diagram of the structure of a battery cell end cap assembly provided in some embodiments of this application;

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

[0055] The reference numerals in the accompanying drawings for the specific embodiments are as follows:

[0056] 1000. Vehicle; 1. Battery unit; 2. Controller; 3. Motor; 4. Battery cell assembly;

[0057] 100. Battery cell; 200. Housing; 210. First housing; 220. Second housing;

[0058] 10. Shell; 11. Opening;

[0059] 20. Electrode assembly; 21. Electrode tab;

[0060] 30. End cap assembly; 31. End cap; 311. First groove; 312. Second groove; 32. Insulating component; 33. First electrode lead-out portion; 331. First lead-out portion; 332. Second lead-out portion; 34. Liquid injection hole; 341. First hole; 342. Second hole; 35. Pressure relief portion; 351. First pressure relief portion; 352. Second pressure relief portion; 36. Second electrode lead-out portion; 361. Third lead-out portion; 362. Fourth lead-out portion;

[0061] 40. Connecting component; 41. First connector; 411. First connecting post; 42. Second connector; 421. Second connecting post;

[0062] 50. Electrode terminal; 60. Sealing pin;

[0063] X, the second direction; Y, the first direction. Detailed Implementation

[0064] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0065] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0066] In this application, the reference to "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.

[0067] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0068] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0069] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0070] In this application, "multiple" means two or more (including two).

[0071] Currently, judging from market trends, the application of battery devices is becoming increasingly widespread. Battery devices are not only used in energy storage power systems such as hydropower, thermal power, wind power, and solar power plants, but also widely applied in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. With the continuous expansion of battery device applications, market demand is also constantly increasing.

[0072] In this embodiment of the application, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0073] The battery cell can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments of this application are not limited to this.

[0074] In related technologies, the connection between the end cap and the insulating component of a battery cell is not stable enough, which causes the insulating component to deform easily during normal operation, thereby affecting the safety of the electrode assembly and reducing the reliability of the battery cell.

[0075] Based on the above-mentioned technical problems, this application provides a battery cell including a housing, an electrode assembly, an end cap assembly, and a connecting assembly. The end cap and an insulating member are fixedly connected by the connecting assembly to form an end cap assembly. By setting the connecting assembly to include a plurality of first connecting members distributed circumferentially along the end cap assembly, and a second connecting member surrounded by the plurality of first connecting members, it is beneficial to improve the connection strength between the end cap and the insulating member, thereby improving the reliability of the end cap assembly, and further improving the reliability of the battery cell.

[0076] The technical solutions described in the embodiments of this application are applicable to various battery devices or electrical equipment that use individual battery cells, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles, ships, and spacecraft. For example, spacecraft include airplanes, rockets, space shuttles, and spacecraft.

[0077] It should be understood that the technical solutions described in the embodiments of this application are not limited to the devices described above, but can also be applied to all devices that use battery devices. However, for the sake of brevity, the following embodiments are all illustrated using electric vehicles as examples.

[0078] For example, such as Figure 1 As shown, Figure 1This is a schematic diagram of the structure of a vehicle 1000 according to one embodiment of this application. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. The vehicle 1000 can internally house a motor 3, a controller 2, and a battery device 1. The controller 2 controls the battery device 1 to supply power to the motor 3. For example, the battery device 1 can be located at the bottom, front, or rear of the vehicle 1000. The battery device 1 can be used to power the vehicle 1000; for example, it can serve as the operating power source for the vehicle 1000's electrical system, such as meeting the power requirements for starting, navigation, and operation. In another embodiment of this application, the battery device 1 can not only serve as the operating power source for the vehicle 1000 but also as the driving power source, replacing or partially replacing gasoline or natural gas to provide driving power to the vehicle 1000.

[0079] Please see Figure 2 The battery device 1 mentioned in the embodiments of this application may include one or more battery cell assemblies 4 for providing voltage and capacity. The battery cell assembly 4 may include multiple battery cells 100, which are connected in series, parallel or mixed connection through a busbar.

[0080] In some embodiments, the battery cell assembly 4 is typically formed by arranging multiple battery cells 100.

[0081] In some embodiments, the battery device 1 may be a battery pack, which includes a housing 200 and one or more battery cell assemblies 4, the battery cell assemblies 4 being housed in the housing 200.

[0082] As an example, the battery cell assembly 4 can be a battery module, and the battery cell assembly 4 can be housed in the housing 200 by fixing the battery module in the housing 200.

[0083] As an example, the battery cell assembly 4 can also be housed in the housing 200 by directly fixing multiple battery cells 100 to the housing 200.

[0084] As an example, the housing 200 may include a first housing 210 and a second housing 220. The first housing 210 and the second housing 220 are fastened together to form a receiving cavity, thereby creating a closed space inside the housing 200 to house the battery cell assembly 4. Here, "closed" refers to covering or closing, which can be either sealed or unsealed. The first housing 210 may be a top cover or a bottom plate.

[0085] As an example, the housing 200 may include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are respectively connected to the frame, so that the interior of the housing 200 forms an enclosed space to accommodate the battery cell assembly 4.

[0086] In some embodiments, the housing 200 may be part of the chassis structure of the vehicle 1000. For example, a portion of the housing 200 may be at least a portion of the floor of the vehicle 1000, or a portion of the housing 200 may be at least a portion of the crossbeams and longitudinal beams of the vehicle 1000.

[0087] The box 200 can be a simple three-dimensional structure such as a cuboid or a cylinder, or it can be a complex three-dimensional structure composed of simple three-dimensional structures such as cuboids or cylinders. The embodiments of this application do not limit this.

[0088] Specifically, the housing 200 can be a metal shell made of alloy steel, alloy aluminum, etc., or a composite material shell made of metal and polypropylene, etc.

[0089] As an example, the battery cell assembly 4 can be a battery module, which is formed by arranging and fixing multiple battery cells 100 together to form an independent module. As an example, the battery module can be formed by bundling multiple battery cells 100 together with cable ties.

[0090] like Figure 3 As shown, the battery cell 100 includes a housing 10, an electrode assembly 20, and an end cap assembly 30.

[0091] The housing 10 and the end cap assembly 30 are connected to form an outer shell, which is a component for forming the internal environment of the battery cell 100. The internal environment formed therein can be used to house the electrode assembly 20, as well as the electrolyte and other components.

[0092] Optionally, the housing 10 may be made of, but is not limited to, metallic or non-metallic materials. For example, metallic materials may be copper, aluminum, or stainless steel; non-metallic materials may be polyethylene, polypropylene, or polyvinyl chloride.

[0093] For example, the housing 10 can be a steel housing, an aluminum housing, a plastic housing (such as polypropylene), a composite metal housing (such as a copper-aluminum composite housing), or an aluminum-plastic film, etc.

[0094] The housing 10 has an opening 11, and the end cap assembly 30 is connected to the housing 10 to seal the opening 11. The housing 10 may have one or more openings 11. The end cap assembly 30 may also have one or more.

[0095] The shape of the housing 10 can be determined according to the specific shape of the electrode assembly 20. For example, if the electrode assembly 20 is a cuboid structure, a cuboid housing can be selected.

[0096] Electrode assembly 20 is a component in the battery cell 100 where an electrochemical reaction occurs, and the housing 10 may contain one or more electrode assemblies 20.

[0097] In some embodiments, the electrode assembly 20 may be cylindrical, flat, or polygonal in shape.

[0098] The electrode assembly 20 can be a wound structure, a stacked structure, or a hybrid structure of wound and stacked.

[0099] The electrode assembly 20 includes a positive electrode, a negative electrode, and a separator, with the separator positioned between the negative and positive electrodes. During the charging and discharging process of the battery cell 100, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, serves to prevent short circuits between the positive and negative electrodes while allowing active ions to pass through.

[0100] In some embodiments, the end cap assembly 30 is provided with at least one electrode terminal 50, which is electrically connected to the tab 21 of the electrode assembly 20. The electrode terminal 50 can be directly connected to the tab 21 or indirectly connected to the tab 21 through a current collector.

[0101] Electrode terminal 50 can be electrically connected to electrode assembly 20 for outputting or inputting electrical energy into battery cell 100. Electrode terminal 50 can be electrically connected to electrode assembly 20 by connecting to tab 21. Tab 21 electrically connected to electrode terminal 50 can be either a positive or negative tab.

[0102] In this application, the battery cell 100 may include, but is not limited to, one of a lithium-ion battery cell, a sodium-ion battery cell, or a magnesium-ion battery cell.

[0103] Please refer to the following: Figures 2 to 8According to an embodiment of this application, a battery cell 100 is provided, including a housing 10, an electrode assembly 20, an end cap assembly 30, and a connecting assembly 40. The housing 10 has an opening 11. The electrode assembly 20 is housed within the housing 10. The end cap assembly 30 includes an end cap 31 and an insulating member 32. The end cap 31 closes to the opening 11, and the insulating member 32 is disposed on the side of the end cap 31 facing the electrode assembly 20. The connecting assembly 40 is disposed between the end cap 31 and the insulating member 32, and the end cap 31 and the insulating member 32 are connected by the connecting assembly 40. The connecting assembly 40 includes a first connecting member 41 and a second connecting member 42. There are multiple first connecting members 41, which are distributed circumferentially around the end cap assembly 30 and arranged around the second connecting member 42.

[0104] End cap 31 is connected to housing 10 to accommodate electrode assembly 20. Insulator 32 is located between end cap 31 and electrode assembly 20 to improve the insulation performance of end cap 31 and electrode assembly 20, which helps to prevent electrolyte corrosion of end cap 31 and cause electrical connection problems in battery cell 100.

[0105] In this configuration, the insulating member 32 is disposed on the side of the end cap 31 facing the electrode assembly 20 along the thickness direction of the end cap 31. Alternatively, the insulating member 32 is disposed on the side of the end cap 31 facing the electrode assembly 20 along the height direction of the battery cell 100.

[0106] The end cap 31 and the insulating member 32 are fixedly connected by a connecting assembly 40 to form an end cap assembly 30. The connecting assembly 40 includes a plurality of first connecting members 41 distributed circumferentially along the end cap assembly 30, which can effectively disperse the connection stress generated between the end cap 31 and the insulating member 32, and help avoid the end cap assembly 30 from failing or deforming due to stress concentration. In addition, the connecting assembly 40 also includes a second connecting member 42 surrounded by a plurality of first connecting members 41. The setting of the second connecting member 42 can compensate for the situation where the connection between the end cap 31 and the insulating member 32 is not firm due to the lack of a connecting member in the middle. It can effectively prevent the area of ​​the insulating member 32 located in this part from swelling due to immersion in electrolyte during the operation of the battery cell 100, thus avoiding the compression of the tab 21 or even the breakage of the tab 21.

[0107] The circumferential direction of the end cap assembly 30 can be understood as a closed path surrounding the outer peripheral edge of the end cap assembly 30. For example, if the end cap assembly 30 is a cylindrical structure, the multiple first connectors 41 can form a ring structure around it. If the end cap assembly 30 is a square structure, the multiple first connectors 41 can form a polygonal structure around it.

[0108] The battery cell 100 provided in some embodiments of this application, by configuring the connecting assembly 40 to include a plurality of first connecting members 41 distributed circumferentially along the end cap assembly 30, and a second connecting member 42 surrounded by the plurality of first connecting members 41, the first connecting members 41 can connect the edge regions of the end cap 31 and the insulating member 32, and the second connecting member 42 can connect the middle regions of the end cap 31 and the insulating member 32, increases the connection position between the end cap 31 and the insulating member 32, thereby enhancing the connection strength between the end cap 31 and the insulating member 32, effectively preventing deformation of the insulating member 32, thereby improving the reliability of the end cap assembly 30, and thus improving the reliability of the battery cell 100.

[0109] Optionally, the first connector 41 can be configured as a snap-fit ​​structure. The first connector 41 may include a protrusion and a slot, one of which is disposed on the end cap 31 and the other is disposed on the insulating member 32, so that the end cap 31 and the insulating member 32 form a snap-fit ​​connection through the snap-fit ​​structure.

[0110] Optionally, the first connector 41 may also be configured as, but is not limited to, a fastener structure such as a bolt or screw, so that the end cap 31 and the insulating member 32 are fastened together by the fastener.

[0111] Optionally, the first connector 41 can be configured as a hot-melt pillar structure so that the end cap 31 and the insulating member 32 are fused together by the hot-melt pillar.

[0112] Alternatively, the second connector 42 can also be configured as any one of a snap-fit ​​structure, a fastener structure, and a thermoplastic column structure.

[0113] Optionally, the first connector 41 and the second connector 42 can be configured to have the same structure, or they can be configured to have different structures.

[0114] Optionally, the shape, area, and structure of each first connector 41 can be set to be the same or different.

[0115] Optionally, the number of second connectors 42 can be set to one or more.

[0116] Optionally, the area of ​​the second connector 42 can be the same as or different from the area of ​​the first connector 41.

[0117] Please continue reading. Figure 4 In some optional embodiments, there are multiple second connectors 42, which are spaced apart.

[0118] It should be noted that multiple first connectors 41 surround all of the second connectors 42.

[0119] The battery cell 100 provided in some embodiments of this application can further compensate for the defect of low connection strength between the end cap 31 and the insulating member 32 at the middle position by providing a plurality of second connectors 42, thereby improving the connection strength between the end cap 31 and the insulating member 32, so as to avoid deformation of the end cap assembly 30, thereby improving the reliability of the battery cell 100.

[0120] It should be noted that the first direction Y and the second direction X in this application are intersecting. In the embodiments of this application, the battery cell 100 can be a square battery cell. For example, the battery cell 100 is a rectangular battery cell, the first direction Y can be understood as the length direction of the end cap assembly 30, and the second direction X is the width direction of the end cap assembly 30, or the first direction Y can be understood as the width direction of the end cap assembly 30, and the second direction X is the length direction of the end cap assembly 30, wherein the first direction Y is perpendicular to the second direction X, and the dimension of the end cap assembly 30 along the first direction Y is larger than the dimension of the end cap assembly 30 along the second direction X.

[0121] Optionally, the battery cell 100 can also be a square battery cell. In this structure, the size of the end cap assembly 30 along the first direction Y is equal to the size of the end cap assembly 30 along the second direction X, wherein the first direction Y is perpendicular to the second direction X.

[0122] Optionally, the battery cell 100 can also be a cylindrical battery cell. In this structure, the first direction Y or the second direction X can be understood as the radial direction of the end cap assembly 30, or the radial direction of the battery cell 100.

[0123] Optionally, a plurality of second connectors 42 are spaced apart along the first direction Y.

[0124] The layout is reasonable and can effectively utilize the space of the end cap 31 and the insulating member 32 along the first direction Y.

[0125] Optionally, the midpoints of a plurality of second connectors 42, which are spaced apart along the first direction Y, are located on the same extension line.

[0126] By setting it in the above manner, the load can be evenly transmitted on the end cap assembly 30, thereby effectively avoiding stress concentration or deformation. It also facilitates the alignment and assembly of the end cap 31 and the insulating part 32, which helps to improve the assembly efficiency and connection stability of the end cap assembly 30.

[0127] like Figure 4 As shown, in some alternative embodiments, in the second direction X, the connecting component 40 has two spaced-apart first connecting groups, each first connecting group including a plurality of first connectors 41 spaced-apart along the first direction Y.

[0128] Optionally, the two first connection groups are symmetrically distributed in the second direction X, which helps to improve the uniformity of the connection between the end cap 31 and the insulating member 32, and also enables the end cap assembly 30 to uniformly transmit the load, which helps to improve the overall deformation resistance of the end cap assembly 30.

[0129] In some alternative embodiments, the midpoints of two first connectors 41, which are spaced apart along the second direction X, are located on the same extension line.

[0130] By aligning the midpoints of the multiple first connectors 41 in the second direction X, the load can be evenly distributed on the end cap assembly 30, thereby effectively avoiding stress concentration or deformation. It also facilitates the alignment and assembly of the end cap 31 and the insulating part 32, thus improving the assembly efficiency and connection stability of the end cap assembly 30.

[0131] In some alternative embodiments, the midpoints of two first connectors 41, which are spaced apart along the first direction Y, are located on the same extension line.

[0132] By aligning the midpoints of the multiple first connectors 41 in the first direction Y, the load can be evenly transmitted on the end cap assembly 30, thereby effectively avoiding stress concentration or deformation. It also facilitates the alignment and assembly of the end cap 31 and the insulating part 32, thus improving the assembly efficiency and connection stability of the end cap assembly 30.

[0133] Please continue reading. Figure 4 In some alternative embodiments, the orthographic projection of the first connector 41 and the orthographic projection of the second connector 42 are intersected in the same projection plane perpendicular to the first direction Y.

[0134] This can be understood as follows: in the projection plane perpendicular to the first direction Y, the orthographic projection of the first connector 41 and the orthographic projection of the second connector 42 do not overlap.

[0135] In some alternative embodiments, the orthographic projections of the first connector 41 and the second connector 42 intersect in the same projection plane perpendicular to the second direction X. The first direction Y intersects the second direction X.

[0136] This can be understood as follows: in the projection plane perpendicular to the second direction X, the orthographic projection of the first connector 41 and the orthographic projection of the second connector 42 do not overlap.

[0137] The battery cell 100 provided in some embodiments of this application can effectively avoid stress concentration in the end cap assembly 30 by staggering the first connector 41 and the second connector 42, and can also avoid interference between the two during assembly. It also helps to improve the uniform distribution of the connection position between the end cap 31 and the insulating member 32, thereby improving the structural strength of the end cap assembly 30.

[0138] Please see Figures 4 to 8 In some alternative embodiments, the first connector 41 includes a first connecting post 411 disposed on the insulating member 32, and the end cap 31 is provided with a first groove 311 that matches the first connecting post 411, and the first connecting post 411 is accommodated in the first groove 311.

[0139] The first groove 311 is provided in a one-to-one correspondence with the first connecting post 411. The multiple first connecting posts 411 are distributed at intervals along the circumference of the end cap assembly 30. Correspondingly, the multiple first grooves 311 are also distributed at intervals along the circumference of the end cap assembly 30.

[0140] Specifically, the end cap 31 is recessed inward along its thickness direction on one side of the surface facing the insulating member 32 to form a first groove 311. The insulating member 32 is provided with a first connecting post 411 that matches the first groove 311 on one side of the surface facing the end cap 31. The first connecting post 411 can be accommodated in the first groove 311 so that the insulating member 32 is fixed to the end cap 31.

[0141] With the above configuration, the first connecting post 411 can be inserted into and accommodated in the first groove 311 to achieve the connection between the end cap 31 and the insulating member 32. This not only improves the connection strength between the two, but also makes full use of the space between the end cap 31 and the insulating member 32, making their connection tighter.

[0142] In some embodiments, the first connector 41 may further include a first adhesive, and the first connecting post 411 is accommodated in the first groove 311 and bonded to the end cap 31 by the first adhesive, which facilitates assembly and also helps to improve the connection strength between the end cap 31 and the insulating member 32.

[0143] In other embodiments, the first connecting post 411 is a first hot melt post.

[0144] By setting the first connecting post 411 in the form of a first heat-fused post, assembly is facilitated, which helps to simplify the assembly efficiency of the end cap assembly 30, reduce the production cost of the battery cell 100, and also allows for a more compact connection between the end cap 31 and the insulating component 32. In addition, the integral connection of the end cap 31 and the insulating component 32 through heat fusion curing can also achieve better vibration resistance, thereby further improving the reliability of the battery cell 100.

[0145] Optionally, the shape of the first connecting post 411 can be set to, but is not limited to, any one of a circle, a square, a triangle, or an ellipse.

[0146] Optionally, the first connecting post 411 and the insulating component 32 are an integral structure. This arrangement not only improves the assembly efficiency between the two but also reduces the risk of the first connecting post 411 falling off before installation, thereby improving the connection strength between the end cap 31 and the insulating component 32.

[0147] Please see Figure 7 and Figure 8 In some alternative embodiments, the second connector 42 includes a second connecting post 421 disposed on the insulating member 32, and the end cap 31 is provided with a second groove 312 that matches the second connecting post 421, and the second connecting post 421 is accommodated in the second groove 312.

[0148] The second groove 312 and the second connecting post 421 are respectively provided. Specifically, the end cap 31 is recessed inward along its own thickness direction on the side surface facing the insulating member 32 to form the second groove 312. The side surface of the insulating member 32 facing the end cap 31 is provided with a second connecting post 421 that matches the second groove 312. The second connecting post 421 can be accommodated in the second groove 312 so that the insulating member 32 is fixed to the end cap 31.

[0149] With the above configuration, the second connecting post 421 can be inserted into and accommodated in the second groove 312 to achieve the connection between the end cap 31 and the insulating member 32. This not only improves the connection strength between the two, but also makes full use of the space between the end cap 31 and the insulating member 32, making their connection tighter.

[0150] In some embodiments, the second connector 42 may further include a second adhesive, and the second connecting post 421 is accommodated in the second groove 312 and bonded to the end cap 31 by the second adhesive, which facilitates assembly and also helps to improve the connection strength between the end cap 31 and the insulating member 32.

[0151] In other embodiments, the second connecting post 421 is a second hot melt post.

[0152] By setting the second connecting post 421 in the form of a second heat-fused post, electrolyte leakage or the intrusion of external impurities and other particles can be effectively prevented, thereby improving the reliability of the battery cell 100. Furthermore, it facilitates assembly, simplifies the assembly efficiency of the end cap assembly 30, reduces the production cost of the battery cell 100, and allows for a more compact connection between the end cap 31 and the insulating component 32. In addition, the integral connection of the end cap 31 and the insulating component 32 via heat fusion curing achieves better vibration resistance, further enhancing the reliability of the battery cell 100.

[0153] Optionally, the shape of the second connecting post 421 can be set to, but is not limited to, any one of a circle, square, triangle, or ellipse.

[0154] Optionally, the second connecting post 421 and the insulating component 32 are an integral structure. This arrangement not only improves the assembly efficiency between the two but also reduces the risk of the second connecting post 421 falling off before installation, thereby enhancing the connection strength between the end cap 31 and the insulating component 32.

[0155] For example, the first connector 41 includes a first connecting post 411, and the second connector 42 includes a second connecting post 421. The first connecting post 411 is a first hot-melt post, and the second connecting post 421 is a second hot-melt post. When the end cap 31 and the insulating member 32 are assembled, the first hot-melt post can be aligned with the first groove 311, and the second hot-melt post can be aligned with the second groove 312, so that the first hot-melt post is inserted into the first groove 311 and the second hot-melt post is inserted into the second groove 312. The first hot-melt post and the second hot-melt post are melted by heating. The first hot-melt post is completely melted and accommodated in the first groove 311, and the second hot-melt post is completely melted and accommodated in the second groove 312 to achieve a fixed connection between the end cap 31 and the insulating member 32.

[0156] In some alternative embodiments, at least a portion of the cross-sectional area of ​​the first groove 311 increases in the direction from the insulating member 32 to the end cap 31.

[0157] From the direction of the insulating member 32 toward the end cap 31, there are multiple planes extending along the first direction Y. "Cross-sectional area of ​​the first groove 311" refers to the area of ​​the first groove 311 after being cut by each of the planes extending along the first direction Y.

[0158] The phrase "at least a portion of the cross-sectional area of ​​the first groove 311 shows an increasing trend" can be understood as follows: the cross-sectional area of ​​the portion of the first groove 311 closer to the end cap 31 relative to the insulating member 32 is greater than the cross-sectional area of ​​the portion of the first groove 311 farther from the end cap 31 relative to the insulating member 32. Here, "closer" refers to the portion where, in the direction from the insulating member 32 to the end cap 31, the distance between the first groove 311 and the end cap 31 is less than the distance between the first groove 311 and the insulating member 32. Conversely, "farther" refers to the portion where, in the direction from the insulating member 32 to the end cap 31, the distance between the first groove 311 and the insulating member 32 is less than the distance between the first groove 311 and the end cap 31.

[0159] By setting it in the above manner, the possibility of the first connecting post 411 coming out of the first groove 311 can be effectively reduced, thereby improving the stability of the first connecting post 411 being contained in the first groove 311, which in turn helps to improve the connection strength between the end cover 31 and the insulating member 32, so as to improve the reliability of the battery cell 100.

[0160] Optionally, the first groove 311 can be configured as a countersunk hole, and the first groove 311 can be formed into a countersunk hole by die extrusion.

[0161] In some alternative embodiments, at least a portion of the cross-sectional area of ​​the second groove 312 tends to increase.

[0162] Depend on Figure 6 As shown, "the cross-sectional area of ​​at least a portion of the second groove 312 tends to increase" can be understood as the cross-sectional area of ​​the portion of the second groove 312 near the end cap 31 relative to the insulating member 32 being greater than the cross-sectional area of ​​the portion of the second groove 312 away from the end cap 31 relative to the insulating member 32.

[0163] By setting it in the above manner, the possibility of the second connecting post 421 coming out of the second groove 312 can be effectively reduced, thereby improving the stability of the second connecting post 421 being contained in the second groove 312, which in turn helps to improve the connection strength between the end cover 31 and the insulating member 32, so as to improve the reliability of the battery cell 100.

[0164] Optionally, the second groove 312 can be configured as a countersunk hole, and the second groove 312 can be formed into a countersunk hole by die extrusion.

[0165] Optionally, in the direction from the insulating member 32 to the end cap 31, the cross-sectional area of ​​a portion of the first groove 311 tends to increase, or the cross-sectional area of ​​all the first grooves 311 tends to increase.

[0166] Optionally, in the direction from the insulating member 32 to the end cap 31, the cross-sectional area of ​​a portion of the second groove 312 tends to increase, or the cross-sectional area of ​​all the second grooves 312 tends to increase.

[0167] In some embodiments, in the direction from the insulating member 32 to the end cap 31, at least one of the first groove 311 and the second groove 312 includes a first groove body and a second groove body that are connected together, the first groove body is disposed toward the insulating member 32, and at least a portion of the cross-sectional area of ​​the first groove body is smaller than the cross-sectional area of ​​the second groove body.

[0168] Furthermore, in the direction from the insulating member 32 to the end cap 31, the first groove includes a sub-groove and a connecting hole, the connecting hole connecting the sub-groove and the second groove, the cross-sectional area of ​​the sub-groove is greater than the cross-sectional area of ​​the second groove, and the cross-sectional area of ​​the second groove is greater than the cross-sectional area of ​​the connecting hole.

[0169] Please see Figure 4 and Figure 8 In some alternative embodiments, in the first direction Y, the distance between the midpoint of the second connector 42 and the midpoint of the adjacent first connector 41 is between 5 mm and 25 mm.

[0170] "Adjacent first connector 41" refers to one or more first connectors 41 that are closest to a certain second connector 42 in the first direction Y.

[0171] As an example, in the first direction Y, the distance between the midpoint of the second connector 42 and the midpoint of the adjacent first connector 41 can be, but is not limited to, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, etc.

[0172] If this spacing is set too small, i.e., less than 5mm, the second connector 42 and the adjacent first connector 41 will be designed too close in the first direction Y, which may cause the connection area to overlap, weaken the connection strength, and easily cause interference during assembly. If the first connector 41 is set to include the first hot melt pillar and the second connector 42 is set to include the second hot melt pillar, they may also easily fuse together. On the other hand, if this spacing is set too large, i.e., greater than 15mm, the second connector 42 and the adjacent first connector 41 will be designed too far apart in the first direction Y, which cannot effectively improve the connection strength between the end cap 31 and the insulating part 32, resulting in the insulating part 32 still having the risk of swelling and deformation.

[0173] Therefore, by setting the distance between the midpoint of the second connector 42 and the midpoint of the adjacent first connector 41 along the first direction Y between 5mm and 25mm, including two endpoint values ​​of 5mm and 15mm, the layout is reasonable. This not only avoids interference between the first connector 41 and the second connector 42 during assembly, but also helps to ensure the connection strength between the end cap 31 and the insulating part 32.

[0174] It is understandable that when the first connector 41 includes the first connecting post 411 and the second connector 42 includes the second connecting post 421, the distance between the midpoint of the second connector 42 and the midpoint of the adjacent first connector 41 can be regarded as the same as the distance between the midpoint of the second connecting post 421 and the midpoint of the adjacent first connecting post 411.

[0175] For example, such as Figure 8As shown, D1 refers to the distance between the midpoint of the first second connecting post 421 on the left and the midpoint of the adjacent first connecting post 411; D2 refers to the distance between the midpoint of the second second connecting post 421 on the left and the midpoint of the adjacent first connecting post 411; D3 refers to the distance between the midpoint of the third second connecting post 421 on the left and the midpoint of the adjacent first connecting post 411; and D4 refers to the distance between the midpoint of the first second connecting post 421 on the right and the midpoint of the adjacent first connecting post 411. Wherein, 5mm≤D1≤25mm, 5mm≤D2≤25mm, 5mm≤D3≤25mm, and 5mm≤D4≤25mm.

[0176] In some alternative embodiments, in the first direction Y, the distance between the midpoint of the second connector 42 and the midpoint of the adjacent first connector 41 is between 15 mm and 20 mm.

[0177] As an example, in the first direction Y of the end cap assembly 30, the distance between the midpoint of the second connector 42 and the midpoint of the adjacent first connector 41 can be, but is not limited to, 15mm, 16mm, 17mm, 19mm, 19mm, 20mm, etc.

[0178] By further setting the distance between the midpoint of the second connector 42 and the midpoint of the adjacent first connector 41 along the first direction Y to be between 5mm and 25mm, including two endpoint values ​​of 5mm and 15mm, it is beneficial to further improve the connection strength between the end cap 31 and the insulating member 32.

[0179] Furthermore, such as Figure 8 As shown, 15mm≤D1≤20mm, 15mm≤D2≤20mm, 15mm≤D3≤20mm, 15mm≤D4≤20mm.

[0180] Please see Figure 4 In some optional embodiments, among the two first connectors 41 located on the same side of the second connector 42 along the first direction Y and adjacent to the second connector 42, the distance between the midpoint of one first connector 41 and the midpoint of the other first connector 41 in the second direction X is W, and the distance between the midpoint of any one of the two adjacent first connectors 41 and the midpoint of the second connector 42 in the second direction X is C, where 1 / 4 ≤ C / W ≤ 3 / 4, and the first direction Y intersects the second direction X.

[0181] As an example, C / W can be, but is not limited to, 1 / 4, 3 / 8, 1 / 2, 5 / 8, 3 / 4, etc.

[0182] Taking any second connector 42 as an example, on the same side of the first direction Y, there are two first connectors 41 that are closest to this second connector 42. The distance between the midpoints of these two first connectors 41 in the second direction X is W. In the second direction X, the distance between the midpoint of this second connector 42 and the midpoint of one of the two first connectors 41 is C1, satisfying 1 / 4 ≤ C1 / W ≤ 3 / 4. The distance between the midpoint of this second connector 42 and the midpoint of the other of the two first connectors 41 is C2, satisfying 1 / 4 ≤ C2 / W ≤ 3 / 4. Here, C includes C1 and C2. C1 can be equal to C2, or C1 can not be equal to C2, as long as 1 / 4 ≤ C / W ≤ 3 / 4 is satisfied.

[0183] If the C / W ratio is set too small or too large, i.e., C / W < 1 / 4 or C / W > 3 / 4, the second connector 42 will be too close to one of the first connectors 41 along the second direction X, which may cause the connection areas to overlap and interference to easily occur during assembly. If the first connector 41 is set to include the first hot melt pillar and the second connector 42 is set to include the second hot melt pillar, it is also easy for the two to be fused together.

[0184] Therefore, by setting the C / W value between 1 / 4 and 3 / 4, including the two endpoint values ​​of 1 / 4 and 3 / 4, the layout is reasonable. This not only avoids interference between the first connector 41 and the second connector 42 during assembly, but also helps to ensure the connection strength between the end cap 31 and the insulating part 32.

[0185] In some alternative embodiments, 3 / 8 ≤ C / W ≤ 5 / 8.

[0186] By setting the C / W value between 3 / 8 and 5 / 8, including both endpoint values ​​of 3 / 8 and 5 / 8, the connection strength between the end cap 31 and the insulator 32 can be further improved.

[0187] In some alternative embodiments, C / W = 1 / 2.

[0188] This configuration facilitates the positioning of the first connector 41 and the second connector 42, and also enhances the structural strength of the end cap assembly 30, thereby improving the reliability of the battery cell 100.

[0189] For example, such as Figure 4As shown, in the second direction X, the connecting assembly 40 has two spaced-apart first connecting groups. Each first connecting group includes a plurality of first connecting members 41 spaced-apart along the first direction Y. The midpoints of two spaced-apart first connecting members 41 are located on the same extension line. The midpoints of the plurality of spaced-apart first connecting members 41 are located on the same extension line, and the midpoints of the plurality of spaced-apart second connecting members 42 are located on the same extension line. In the first direction Y, the distance between the midpoint of a second connecting member 42 and the midpoint of an adjacent first connecting member 41 is between 15mm and 20mm. In the second direction X, the distance between the midpoints of any two first connecting members 41 is W, and the distance between the midpoint of any second connecting member 42 and the midpoint of any first connecting member 41 is C, where C / W = 1 / 2.

[0190] Please see Figure 3 , Figure 4 , Figure 7 and Figure 8 In some optional embodiments, the end cap assembly 30 is provided with a first electrode lead-out portion 33 and a second electrode lead-out portion 36 along the first direction Y, and a first connector 41 and a second connector 42 are provided between the first electrode lead-out portion 33 and the second electrode lead-out portion 36.

[0191] The electrode assembly 20 has tabs 21 including a first tab and a second tab with opposite polarities, one of which is a positive tab and the other is a negative tab. The first electrode lead-out portion 33 includes a first lead-out portion 331 on the insulating member 32 and a second lead-out portion 332 on the end cap 31. The first tab can be connected to the electrode terminal 50 sequentially through the first lead-out portion 331 and the second lead-out portion 332. The second electrode lead-out portion 36 includes a third lead-out portion 361 on the insulating member 32 and a fourth lead-out portion 362 on the end cap 31. The second tab can be connected to the electrode terminal 50 sequentially through the third lead-out portion 361 and the fourth lead-out portion 362.

[0192] The battery cell 100 provided in some embodiments of this application, by providing a first connector 41 and a second connector 42 between the first electrode lead-out portion 33 and the second electrode lead-out portion 36, can avoid deformation of the portion of the insulating member 32 located between the first electrode lead-out portion 33 and the second electrode lead-out portion 36, which is beneficial to improving the connection strength between the end cover 31 and the insulating member 32, thereby improving the reliability of the end cover assembly 30.

[0193] Please see Figure 9 and Figure 10In some optional embodiments, in the first direction Y, among the plurality of first connectors 41 located between the first electrode lead-out portion 33 and the second electrode lead-out portion 36, at least one of the first connectors 41 has a size of L1, wherein 3mm≤L1≤80mm.

[0194] Here, L1 refers to the dimension of the first connector 41 in the first direction Y.

[0195] The battery cell 100 provided in some embodiments of this application increases the connection area between the end cap 31 and the insulating member 32 by increasing the size of at least one first connector 41. This is beneficial to improving the connection strength between the end cap 31 and the insulating member 32, thereby effectively preventing the insulating member 32 from swelling and deforming during normal operation of the battery cell 100, and thus improving the reliability of the battery cell 100.

[0196] For example, the value of L1 can be, but is not limited to, 3mm, 10mm, 15mm, 20mm, 30mm, 35mm, 40mm, 50mm, 60mm, 70mm, 80mm, etc.

[0197] Optionally, in the first direction Y, there is a first connector 41 with a size of L1 between the first electrode lead-out portion 33 and the second electrode lead-out portion 36, wherein 3mm≤L1≤80mm.

[0198] In some embodiments, 25mm ≤ L1 ≤ 80mm.

[0199] The battery cell 100 provided in some embodiments of this application further sets the size of L1 between 25mm and 80mm, including two endpoint values ​​of 25mm and 80mm, which can improve the connection strength between the end cover 31 and the insulating member 32 while reducing the number of first connectors 41, making it easier to process.

[0200] Furthermore, in some embodiments, 25mm ≤ L1 ≤ 30mm. This configuration allows for increased connection strength between the end cap 31 and the insulating member 32 while reducing the size of the first connector 41, thus helping to lower costs.

[0201] Please see Figure 4 In some optional embodiments, the end cap assembly 30 further includes an injection hole 34 disposed between the first electrode lead-out portion 33 and the second electrode lead-out portion 36. In the same projection plane perpendicular to the second direction X, the orthographic projection of the injection hole 34 falls into the first connector 41 with a size of L1, and the first direction Y intersects the second direction X. The layout is reasonable as described above.

[0202] Please see Figure 4 , Figure 7 ,and Figure 8 The electrolyte injection hole 34 is used to inject electrolyte into the interior of the battery cell 100. The electrolyte injection hole 34 includes a first hole 341 provided on the insulating member 32 and a second hole 342 provided on the end cap 31. The first hole 341 and the second hole 342 are provided correspondingly along the thickness direction of the end cap assembly 30.

[0203] like Figure 3 and Figure 4 As shown, optionally, the battery cell 100 also includes a sealing pin 60, which is welded to the end cap 31 to seal the liquid injection hole 34.

[0204] Optionally, in the same projection plane perpendicular to the second direction X, the orthographic projection of the injection hole 34 falls into the first connector 41 with a size of L1, wherein 25mm≤L1≤80mm.

[0205] Optionally, in the same projection plane perpendicular to the second direction X, the orthographic projection of the injection hole 34 falls into the first connector 41 with a size of L1, wherein 25mm≤L1≤30mm.

[0206] Please see Figure 11 and Figure 12 In some embodiments, 3mm ≤ L1 < 25mm.

[0207] The battery cell 100 provided in some embodiments of this application further reduces the size of the first connector 41 by setting the size of L1 between 3mm and 25mm and including an endpoint value of 3mm, which can improve the connection strength between the end cover 31 and the insulator 32 and further reduce the size of the first connector 41, thus helping to reduce costs.

[0208] Furthermore, in some embodiments, 10mm ≤ L1 ≤ 15mm. This configuration improves the connection strength between the end cap 31 and the insulator 32 while further reducing costs.

[0209] In some embodiments, within the same projection plane perpendicular to the second direction X, the orthographic projection of the injection hole 34 intersects with the orthographic projection of the first connector 41 with a size of L1. This arrangement results in a reasonable layout.

[0210] Optionally, in the same projection plane perpendicular to the second direction X, the orthographic projection of the injection hole 34 intersects with the orthographic projection of the first connector 41 with a size of L1, wherein 3mm≤L1<25mm.

[0211] Optionally, in the same projection plane perpendicular to the second direction X, the orthographic projection of the injection hole 34 intersects with the orthographic projection of the first connector 41 with a size of L1, wherein 10mm≤L1≤15mm.

[0212] Please see Figure 7 , Figure 8 , Figure 11 and Figure 12 In some optional embodiments, the end cap assembly 30 is provided with a first electrode lead-out portion 33, a liquid injection hole 34, a pressure relief portion 35 and a second electrode lead-out portion 36 in sequence along the first direction Y.

[0213] The pressure relief section 35 is used to release the internal gas of the battery cell 100. The pressure relief section 35 includes a first pressure relief section 351 provided on the insulating member 32 and a second pressure relief section 352 provided on the end cover 31. The first pressure relief section 351 and the second pressure relief section 352 are provided correspondingly along the thickness direction of the end cover assembly 30.

[0214] As an example, the internal pressure or temperature of the battery cell 100 is actuated to release the internal pressure or temperature when it reaches a predetermined threshold. When the internal pressure or temperature of the battery cell 100 reaches the predetermined threshold, the pressure relief section 35 is activated or a weak structure provided in the pressure relief section 35 is destroyed, thereby forming an opening or channel for the release of internal pressure or temperature. The threshold design varies depending on the design requirements.

[0215] Optionally, a first connector 41 and a second connector 42 are provided between the first electrode lead-out portion 33 and the liquid injection hole 34.

[0216] Optionally, a first connector 41 and a second connector 42 are provided between the injection hole 34 and the pressure relief part 35.

[0217] Optionally, a first connector 41 and a second connector 42 are provided between the pressure relief part 35 and the second electrode lead-out part 36.

[0218] Please see Figure 4 , Figure 11 and Figure 12 For example, a first connector 41 and a second connector 42 are provided between the first electrode lead-out portion 33 and the injection hole 34, a first connector 41 and a second connector 42 are provided between the injection hole 34 and the pressure relief portion 35, and a first connector 41 and a second connector 42 are provided between the pressure relief portion 35 and the second electrode lead-out portion 36.

[0219] By setting it in the above manner, the position of the first connector 41 or the second connector 42 can be flexibly set, which is beneficial to improving the flexibility of the use of the battery cell 100.

[0220] For example, such as Figure 10As shown, in the first direction Y, there are two first connectors 41 with a size of L1 between the first electrode lead-out portion 33 and the pressure relief portion 35. These two first connectors 41 are distributed at intervals along the second direction X. There are also two first connectors 41 with a size of L1 between the pressure relief portion 35 and the second electrode lead-out portion 36. These two first connectors 41 are distributed at intervals along the second direction X. Wherein, 25mm≤L1≤30mm.

[0221] For example, such as Figure 12 As shown, in the first direction Y, there are two first connectors 41 with a size of L1 between the first electrode lead-out portion 33 and the injection hole 34. These two first connectors 41 are distributed at intervals along the second direction X. There are two first connectors 41 with a size of L1 between the injection hole 34 and the pressure relief portion 35. These two first connectors 41 are distributed at intervals along the second direction X. There are four first connectors 41 with a size of L1 between the pressure relief portion 35 and the second electrode lead-out portion 36, wherein 10mm≤L1≤15mm.

[0222] Please see Figure 4 , Figure 9 and Figure 11 In some alternative embodiments, in the first direction Y, the first electrode lead-out portion 33 is provided with a first connector 41 on the side opposite to the second electrode lead-out portion 36, and the second electrode lead-out portion 36 is provided with a first connector 41 on the side opposite to the first electrode lead-out portion 33.

[0223] In the above technical solution, the layout is reasonable and can improve the structural strength of the end cap assembly 30 on both sides of its first direction Y, thereby better improving the reliability of the battery cell 100.

[0224] Please see Figure 4 , Figure 9 , Figure 11 and Figure 13 In some alternative embodiments, the orthographic projection of the second connector 42 and the orthographic projection of the injection hole 34 are intersected in the same projection plane perpendicular to the second direction X.

[0225] It should be noted that, in order to ensure the sealing of the battery cell 100, after the liquid filling is completed, a sealing pin 60 will be welded to the liquid filling hole 34 of the end cap assembly 30. Therefore, the second connector 42 and the liquid filling hole 34 are arranged in an alternating manner, which can avoid interference between the second connector 42 and the sealing pin 60, and can also effectively avoid stress concentration in the end cap assembly 30, thereby improving the reliability of the battery cell 100.

[0226] In some alternative embodiments, at least one orthographic projection of a second connector 42 overlaps with the orthographic projection of an injection hole 34 in the same projection plane perpendicular to the first direction Y.

[0227] The layout, set up in the above manner, is reasonable and easy to position.

[0228] like Figure 13 As shown, in some alternative embodiments, in the first direction Y, at least one second connector 42 has a size of L2, wherein 3mm≤L2≤25mm.

[0229] The battery cell 100 provided in some embodiments of this application increases the connection area between the end cap 31 and the insulator 32 by increasing the size of at least one second connector 42, which is beneficial to improving the connection strength between the end cap 31 and the insulator 32.

[0230] In some alternative embodiments, 10mm ≤ L2 ≤ 15mm.

[0231] This configuration can improve the connection strength between the end cap 31 and the insulator 32 while further reducing costs.

[0232] According to some embodiments of this application, this application also provides a battery device including a plurality of battery cells 100 provided in any of the above embodiments.

[0233] According to some embodiments of this application, this application provides an electrical device including a plurality of battery cells 100 provided in any of the embodiments or a battery device provided in any of the embodiments, wherein the battery cells 100 or the battery device are used to store or provide electrical energy.

[0234] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application.

[0235] Please refer to the following: Figures 3 to 8 According to some embodiments of this application, this application provides a battery cell 100, including a housing 10, an electrode assembly 20, an end cap assembly 30, and a connecting assembly 40, wherein the first direction Y is the length direction of the end cap assembly 30, and the second direction X is the width direction of the end cap assembly 30.

[0236] The housing 10 has an opening 11, and the electrode assembly 20 is housed inside the housing 10. The end cap assembly 30 includes an end cap 31 and an insulating member 32. The end cap 31 covers the opening 11, and the insulating member 32 is disposed on the side of the end cap 31 facing the electrode assembly 20. The end cap assembly 30 is provided with a first electrode lead-out portion 33, a liquid injection hole 34 and a second electrode lead-out portion 36 in sequence along the first direction Y.

[0237] A connecting assembly 40 is disposed between the end cap 31 and the insulating member 32, and includes a plurality of first connecting members 41 and a plurality of second connecting members 42. The plurality of first connecting members 41 are distributed circumferentially around the end cap assembly 30, and the plurality of second connecting members 42 are spaced apart. The plurality of first connecting members 41 are arranged around the plurality of second connecting members 42. The first connecting member 41 is a first hot-melt column, and the second connecting member 42 is a second hot-melt column. Both the first hot-melt column and the second hot-melt column are disposed on the insulating member 32. The end cap 31 has a first groove 311 that matches the first hot-melt column and a second groove 312 that matches the second hot-melt column. The first hot-melt column is accommodated in the first groove 311, and the second hot-melt column is accommodated in the second groove 312. From the insulating member 32 to the end cap 31, at least a portion of the cross-sectional area of ​​the first groove 311 and at least a portion of the cross-sectional area of ​​the second groove 312 tends to increase.

[0238] In the first direction Y, a first connector 41 and a second connector 42 are provided between the first electrode lead-out portion 33 and the second electrode lead-out portion 36. The first connector 41 is provided on the side of the first electrode lead-out portion 33 facing away from the second electrode lead-out portion 36, and the first connector 41 is provided on the side of the second electrode lead-out portion 36 facing away from the first electrode lead-out portion 33.

[0239] In a projection plane perpendicular to the first direction Y, the orthographic projections of the first connector 41 and the second connector 42 intersect. In the first direction Y, the distance between the midpoint of the second connector 42 and the midpoint of the adjacent first connector 41 is between 15mm and 20mm. In a projection plane perpendicular to the second direction X, the orthographic projections of the first connector 41 and the second connector 42 intersect, and the orthographic projection of the second connector 42 intersects with the orthographic projection of the injection hole 34. On the same side of the second connector 42 along the first direction Y, and among two adjacent first connectors 41, the distance between the midpoint of one first connector 41 and the midpoint of the other first connector 41 in the second direction X is W, and the distance between the midpoint of any one of the two adjacent first connectors 41 and the midpoint of the second connector 42 in the second direction X is C, where 3 / 8 ≤ C / W ≤ 5 / 8.

[0240] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0241] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features. However, these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A battery cell, characterized by, include: The shell has an opening; Electrode assembly, housed within the housing; An end cap assembly includes an end cap and an insulating member, the end cap closing onto the opening, and the insulating member being disposed on the side of the end cap facing the electrode assembly; A connecting component is disposed between the end cap and the insulating member, the end cap and the insulating member are connected by the connecting component, the connecting component includes a first connector and a second connector, the number of first connectors is multiple, the multiple first connectors are distributed circumferentially at intervals along the end cap component, and the multiple first connectors are arranged around the second connector.

2. The battery cell of claim 1, wherein, The number of the second connectors is multiple, and the multiple second connectors are spaced apart.

3. The battery cell of claim 1, wherein, Within the same projection plane perpendicular to the first direction, the orthographic projection of the first connector and the orthographic projection of the second connector intersect. And / or, in the same projection plane perpendicular to the second direction, the orthographic projection of the first connector and the orthographic projection of the second connector intersect; the first direction intersects the second direction.

4. The battery cell according to any one of claims 1 to 3, characterized in that, The first connector includes a first connecting post, which is disposed on the insulating member. The end cap is provided with a first groove that matches the first connecting post, and the first connecting post is accommodated in the first groove. And / or, the second connector includes a second connecting post disposed on the insulating member, and the end cap has a second groove that matches the second connecting post, the second connecting post being received in the second groove.

5. The battery cell of claim 4, wherein, The first connecting post is a first hot melt post, and / or the second connecting post is a second hot melt post.

6. The battery cell of claim 4, wherein, From the direction of the insulating member toward the end cap, at least a portion of the cross-sectional area of ​​the first groove tends to increase, and / or at least a portion of the cross-sectional area of ​​the second groove tends to increase.

7. The battery cell of any one of claims 1 to 3, wherein, In the first direction, the distance between the midpoint of the second connector and the midpoint of the adjacent first connector is between 5 mm and 25 mm.

8. The battery cell of claim 7, wherein, In the first direction, the distance between the midpoint of the second connector and the midpoint of the adjacent first connector is between 15mm and 20mm.

9. The battery cell of any one of claims 1 to 3, wherein, In the two first connectors located on the same side of the second connector along the first direction and adjacent to the second connector, the distance between the midpoint of one first connector and the midpoint of the other adjacent first connector in the second direction is W, and the distance between the midpoint of any one of the two adjacent first connectors and the midpoint of the second connector in the second direction is C, where 1 / 4 ≤ C / W ≤ 3 / 4, and the first direction intersects the second direction.

10. The battery cell of claim 9, wherein, 3 / 8 ≤ C / W ≤ 5 / 8.

11. The battery cell of claim 2, wherein, The end cap assembly is provided with a first electrode lead-out portion and a second electrode lead-out portion along a first direction, and a first connector and a second connector are provided between the first electrode lead-out portion and the second electrode lead-out portion.

12. The battery cell of claim 11, wherein, In the first direction, among the plurality of first connectors located between the first electrode lead-out portion and the second electrode lead-out portion, at least one of the first connectors has a size of L1, wherein 3mm≤L1≤80mm.

13. The battery cell of claim 12, wherein, 25mm≤L1≤80mm.

14. The battery cell of claim 13, wherein, 25mm≤L1≤30mm.

15. The battery cell of claim 13, wherein, The end cap assembly also includes a liquid injection hole disposed between the first electrode lead-out portion and the second electrode lead-out portion. In the same projection plane perpendicular to the second direction, the orthographic projection of the liquid injection hole falls into the orthographic projection of the first connector with a size of L1, and the first direction intersects the second direction.

16. The battery cell of claim 12, wherein, 3mm≤L1<25mm.

17. The battery cell of claim 16, wherein, 10mm≤L1≤15mm.

18. The battery cell of claim 16, wherein, The end cap assembly also includes a liquid injection hole disposed between the first electrode lead-out portion and the second electrode lead-out portion. In the same projection plane perpendicular to the second direction, the orthographic projection of the liquid injection hole intersects with the orthographic projection of the first connector with a size of L1, and the first direction intersects with the second direction.

19. The battery cell of claim 11, wherein, In the first direction, the first electrode lead-out portion is provided with the first connector on the side opposite to the second electrode lead-out portion, and the second electrode lead-out portion is provided with the first connector on the side opposite to the first electrode lead-out portion.

20. The battery cell of claim 11, wherein, The end cap assembly also includes a liquid injection hole disposed between the first electrode lead-out portion and the second electrode lead-out portion. In the same projection plane perpendicular to the second direction, the orthographic projection of the second connector and the orthographic projection of the liquid injection hole are intersected, and the first direction intersects the second direction.

21. The battery cell of claim 11, wherein, In the first direction, at least one of the second connectors has a size of L2, wherein 3mm ≤ L2 ≤ 25mm.

22. The battery cell of claim 21, wherein, 10mm≤L2≤15mm.

23. A battery device, characterized by It includes multiple battery cells according to any one of claims 1 to 22.

24. An electrical device, comprising: It includes the battery device according to claim 23 or a plurality of battery cells according to any one of claims 1 to 22, wherein the battery cells or the battery device are used to store or provide electrical energy.

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