Battery monomer, battery device and electric device

Abstract

The utility model provides a battery monomer, a battery device and a power utilization device. Each single battery comprises a shell, an end cover assembly and an insulating assembly, the end cover assembly comprises an end cover plate and an electrode terminal, the end cover plate covers an opening of the shell, the end cover plate comprises a protruding part and a connecting part, the electrode terminal is arranged on the connecting part, and the protruding part is arranged in a protruding mode relative to the connecting part in the direction away from the cavity; the insulating assembly comprises a first insulating part and a second insulating part, the first insulating part is arranged on the connecting part, the second insulating part is arranged on the protruding part, the insulating assembly is configured to enable the first insulating part to be fused at a first preset temperature and enable the second insulating part to be fused at a second preset temperature, and the second preset temperature is set to be higher than the first preset temperature. The utility model aims to solve the problems that the end cover plate is provided with a protruding part, the distance between an electrode terminal and / or an electric connecting piece and a second insulating part is reduced, the second insulating part is easily heated and melted, and the short-circuit risk of lap joint of the end cover plate and other devices is improved, and the reliability of the battery monomer is improved.

Description

Technical Field

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

[0002] Battery devices are widely used in electronic devices, such as mobile phones, laptop computers, battery cars, electric vehicles, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes and electric tools, etc.

[0003] In the related art, a plurality of battery cells are accommodated in a box body, and the plurality of battery cells can be connected together in series or in parallel. An insulating patch is usually provided on the outer surface of the end cover plate of the battery cell to insulate the end cover plate and the electrical connector. How to improve the reliability of the insulating patch to reduce the risk of short circuit in the battery device is an urgent problem to be solved. Summary of the Utility Model

[0004] In view of the above problems, the present application provides a battery cell, a battery device and an electrical device, which can enhance the reliability of the insulating patch and reduce the risk of short circuit in the battery device.

[0005] In a first aspect, the present application provides a battery cell, including: a housing including a chamber with an opening; an end cover assembly including an end cover plate and an electrode terminal, the end cover plate covering the opening, the end cover plate including a protruding portion and a connecting portion, the electrode terminal being disposed on the connecting portion, the protruding portion protruding relative to the connecting portion in a direction away from the chamber; an insulating assembly including a first insulating portion and a second insulating portion, the first insulating portion being disposed on the connecting portion, the second insulating portion being disposed on the protruding portion, wherein the insulating assembly is configured to melt the first insulating portion at a first preset temperature; and melt the second insulating portion at a second preset temperature, and the second preset temperature is greater than the first preset temperature.

[0006] In the solution of the embodiment of the present application, the battery cell includes a housing, an end cover assembly and an insulating assembly. The end cover assembly includes an end cover plate and an electrode terminal. The end cover plate covers the opening of the housing. The end cover plate includes a protruding portion and a connecting portion. The electrode terminal is disposed on the connecting portion. The protruding portion protrudes relative to the connecting portion in a direction away from the chamber. The insulating assembly includes a first insulating portion and a second insulating portion. The first insulating portion is disposed on the connecting portion, and the second insulating portion is disposed on the protruding portion to insulate the end cover plate from other components. The insulating assembly is configured to melt the first insulating portion at a first preset temperature and melt the second insulating portion at a second preset temperature, and by setting the second preset temperature to be greater than the first preset temperature, to improve the problem that when a protruding portion is provided on the end cover plate, the distance between the electrode terminal and / or the electrical connector and the second insulating portion becomes smaller, the second insulating portion is easily melted by heat, and the risk of short circuit between the end cover plate and other devices is increased, thereby improving the reliability of the battery cell.

[0007] In some embodiments, the insulating assembly further includes a heat insulating portion, which is disposed on a side of the second insulating portion facing away from the end cover plate.

[0008] In the solution of the embodiment of the present application, the heat insulating portion is disposed on a side of the second insulating portion facing away from the end cover plate, and the heat insulating portion blocks at least part of the heat conducted by the electrical connection member and / or the electrode terminal to the second insulating portion, so as to reduce the risk of the second insulating portion being melted through by heat.

[0009] In some embodiments, the insulating assembly further includes a heat conducting portion. The second insulating portion includes a receiving space, and the heat conducting portion is disposed in the receiving space, or the heat conducting portion is disposed on a side of the second insulating portion facing away from the end cover plate.

[0010] In the solution of the embodiment of the present application, disposing the heat conducting portion in the receiving space helps to improve the insulation performance between the heat conducting portion and other devices, or disposing the heat conducting portion on a side of the second insulating portion facing away from the end cover plate helps to reduce the processing difficulty of the insulating assembly. The heat conducting portion disposed on the second insulating portion can transfer the heat conducted by the electrical connection member and / or the electrode terminal to the second insulating portion to the outside, thereby reducing the risk of the second insulating portion being melted through by heat.

[0011] In some embodiments, the first insulating portion and the second insulating portion are formed separately.

[0012] In the solution of the embodiment of the present application, the first insulating portion and the second insulating portion are formed separately to facilitate adjusting the materials and dimensions of the first insulating portion and the second insulating portion, so as to improve the adaptability between the insulating assembly and different specifications of end cover assemblies.

[0013] In some embodiments, the melting point of the second insulating portion is greater than that of the first insulating portion.

[0014] In the solution of the embodiment of the present application, the melting point of the second insulating portion is greater than that of the first insulating portion, which not only reduces the risk of the second insulating portion being melted through, but also helps to reduce the thickness of the second insulating portion and improve the energy density of the battery cell.

[0015] In some embodiments, the first insulating portion and the second insulating portion are integrally formed.

[0016] In the solution of the embodiment of the present application, the first insulating portion and the second insulating portion are integrally formed, and there is no splicing gap or partition structure in the overall insulating assembly. When facing external impacts and vibrations, the stress dispersion effect is better.

[0017] In some embodiments, the protruding portion includes an end wall and a side wall. The side wall is connected to the end wall and the connecting portion. The battery cell further includes an adhesive, and the adhesive is disposed between the connecting portion and the first insulating portion, and between the second insulating portion and the end wall. The side wall and the adhesive are spaced apart.

[0018] In the solution of the embodiment of the present application, the first insulating part and the second insulating part are fixed to the end cover plate through an adhesive, and the side wall and the adhesive are arranged at intervals. On the one hand, the volume of the adhesive can be reduced, and the processing cost of the battery cell can be reduced. On the other hand, it also helps to reduce the difficulty of replacing and repairing the insulating component.

[0019] In some embodiments, the battery cell further includes a pressure relief mechanism, the pressure relief mechanism is arranged on the protruding part, and at least part of the orthographic projection of the second insulating part in its thickness direction coincides with the pressure relief mechanism.

[0020] In the solution of the embodiment of the present application, at least part of the orthographic projection of the second insulating part in its thickness direction coincides with the pressure relief mechanism. The second insulating part can help the pressure relief mechanism block external impurities, so as to improve the problem of external impurities blocking the pressure relief mechanism and enhance the reliability of the battery cell.

[0021] In some embodiments, the second insulating part includes a main body part and a shielding part. The main body part is connected to the first insulating part and the shielding part. At least part of the orthographic projection of the shielding part in its thickness direction is located inside the pressure relief mechanism. The main body part and the shielding part are connected through a weakening structure.

[0022] In the solution of the embodiment of the present application, the main body part and the shielding part are connected through a weakening structure, so that when the pressure relief mechanism is activated, the shielding part and the main body part can be separated to reduce the blocking effect of the insulating component on the pressure relief mechanism and enhance the reliability of the pressure relief mechanism.

[0023] In some embodiments, the electrode terminal includes a connection area for connecting to an electrical connection member. The minimum distance S 1 from the connection area to the first insulating part, and the minimum distance S 2 from the connection area to the second insulating part satisfy S 2 <S 1 .

[0024] In the solution of the embodiment of the present application, when the minimum distance from the connection area to the second insulating part satisfies the above conditions, setting the melting point of the second insulating part to be greater than the melting point of the first insulating part can effectively reduce the risk of the second insulating part being melted through by the temperature of the connection area and enhance the reliability of the insulating component.

[0025] In a second aspect, the present application provides a battery device, including the battery cell of the first aspect embodiment described above.

[0026] In a third aspect, the present application provides an electrical device, including the battery device of the second aspect embodiment described above. Description of the Drawings

[0027] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the following detailed description of the preferred embodiments. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present application. Moreover, throughout the drawings, the same reference numerals are used to denote the same components. In the drawings:

[0028] Figure 1 is a schematic structural diagram of a vehicle provided by an embodiment of the present application;

[0029] Figure 2 is a schematic structural diagram of a battery device provided by an embodiment of the present application;

[0030] Figure 3 is a schematic structural diagram of a battery module provided by an embodiment of the application;

[0031] Figure 4 is an exploded view of a battery cell provided by an embodiment of the present application;

[0032] Figure 5 is a schematic structural diagram of a battery cell provided by an embodiment of the present application;

[0033] Figure 6 is a schematic structural diagram of a battery device provided by an embodiment of the present application;

[0034] Figure 7 is a side view of a battery cell provided by an embodiment of the present application;

[0035] Figure 8 is a schematic structural diagram of an insulating assembly of a battery cell provided by an embodiment of the present application;

[0036] Figure 9 is a schematic structural diagram of an insulating assembly of a battery cell provided by another embodiment of the present application;

[0037] Figure 10 is Figure 9 an enlarged schematic structural diagram of part A in

[0038] Figure 11 is an exploded view of a battery cell provided by another embodiment of the present application;

[0039] Figure 12 is an exploded view of a battery cell provided by still another embodiment of the present application;

[0040] Figure 13 is an exploded view of a battery cell provided by still another embodiment of the present application;

[0041] Figure 14 is an exploded view of a battery cell provided by still another embodiment of the present application;

[0042] Figure 15 It is a schematic structural diagram of an insulation assembly of a battery cell provided by another embodiment of the present application.

[0043] Explanation of reference numerals:

[0044] 1. Vehicle; 101. Motor; 102. Controller;

[0045] 2. Battery device; 201. Battery module; 202. Box body; 2021. First box body; 2022. Second box body; 203. Electrical connection member;

[0046] 3. Battery cell;

[0047] 4. Housing; 41. Chamber;

[0048] 5. Electrode assembly;

[0049] 6. End cover assembly; 61. Electrode terminal; 62. End cover plate; 621. Connection portion; 622. Protruding portion; 623. End wall; 624. Side wall; 611. Connection area;

[0050] 7. Insulation assembly; 731. First insulation portion; 732. Second insulation portion; 74. Heat insulation portion; 75. Heat conduction portion; 733. Accommodating space; 734. Main body portion; 735. Shielding portion; 736. Weakening structure;

[0051] 8. Pressure relief mechanism;

[0052] 9. Adhesive;

[0053] X. First direction; Y. Second direction. Detailed implementation manners

[0054] Hereinafter, embodiments of the technical solutions of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to illustrate the technical solutions of the present application more clearly, and thus are only examples and cannot be used to limit the protection scope of the present application.

[0055] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in the embodiments of the present application should have the ordinary meanings understood by those skilled in the art to which the embodiments of the present application belong.

[0056] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the embodiments of the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation on the embodiments of the present application.

[0057] In addition, the technical terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. In the description of the embodiments of the present application, the meaning of "a plurality" is more than two, unless otherwise specifically defined.

[0058] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, the technical terms "mount", "connect", "couple", "fix", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can also be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0059] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, the first feature being "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature can be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature can be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0060] Currently, from the perspective of the development of the market situation, the application of power batteries is becoming more and more extensive. Power batteries are not only used in energy storage power systems such as hydroelectric, thermal, wind, and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in many fields such as military equipment and aerospace. With the continuous expansion of the application fields of power batteries, the market demand is also continuously increasing.

[0061] A number of battery cells are provided inside the battery device, and the battery cells are connected in parallel or in series with each other through electrical connectors. Specifically, the electrical connectors are connected to the electrode terminals. In order to reduce the risk of conduction between the electrical connectors and the end cover plate, an insulating patch is provided on the end cover plate. Currently, the insulating patch has the problem of being easily melted by high temperature.

[0062] In the related art, in order to increase the internal space size of the battery cell housing, a scheme in which a part of the end cover assembly protrudes can be adopted. After adopting this scheme, a protruding portion that protrudes toward the electrical connector is formed on the end cover plate, and the distance between the electrode terminal and / or the electrical connector and the protruding portion becomes smaller. The insulating patch provided on the protruding portion is subjected to a higher temperature, and the melting risk of this part of the insulating patch is increased.

[0063] Based on the above problems, the present application provides a battery cell, which includes a housing, an end cover assembly and an insulating assembly. The end cover assembly includes an end cover plate and an electrode terminal. The end cover plate covers the opening of the housing. The end cover plate includes a protruding portion and a connecting portion. The electrode terminal is disposed on the connecting portion. The protruding portion protrudes relative to the connecting portion in a direction away from the chamber. The insulating assembly includes a first insulating portion and a second insulating portion. The first insulating portion is disposed on the connecting portion, and the second insulating portion is disposed on the protruding portion to insulate the end cover plate from other components. The insulating assembly is configured to melt the first insulating portion at a first preset temperature and melt the second insulating portion at a second preset temperature, and by setting the second preset temperature to be greater than the first preset temperature, to improve the problem that when a protruding portion is provided on the end cover plate, the distance between the electrode terminal and / or the electrical connector and the second insulating portion becomes smaller, and the second insulating portion is easily melted by heat, and the risk of short circuit between the end cover plate and other devices is increased, thereby improving the reliability of the battery cell.

[0064] The technical solutions described in the embodiments of the present application are applicable to battery devices and electrical devices using battery devices.

[0065] The electrical device can be a vehicle, a mobile phone, a portable device, a laptop computer, a ship, a spacecraft, an electric toy, an electric tool, etc. The vehicle can be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc.; the spacecraft includes an airplane, a rocket, a space shuttle, a spaceship, etc.; the electric toy includes a fixed or mobile electric toy, for example, a game console, an electric vehicle toy, an electric ship toy, an electric airplane toy, etc.; the electric tool includes a metal cutting electric tool, a grinding electric tool, an assembly electric tool and a railway electric tool, for example, an electric drill, an electric grinding wheel, an electric wrench, an electric screwdriver, a hammer drill, an impact electric drill, a concrete vibrator, a power planer, etc. The embodiments of the present application do not impose special restrictions on the above electrical devices.

[0066] In the embodiments of the present application, the battery cell may be a secondary battery, which refers to a battery cell that can be activated by charging after discharging to continue to be used.

[0067] The battery cell may be a lithium-ion battery, a sodium-ion battery, a sodium-lithium-ion battery, a lithium-metal battery, a sodium-metal battery, a lithium-sulfur battery, a magnesium-ion battery, a nickel-metal hydride battery, a nickel-cadmium battery, a lead-acid battery, etc., and the embodiments of the present application are not limited thereto. The battery cell may be in a cylindrical shape, a flat shape, a cuboid shape or other shapes, and the embodiments of the present application are not limited thereto either.

[0068] The battery device mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide a higher voltage and capacity. For example, the battery device mentioned in the present application may include a battery module or a battery pack, etc. A battery pack generally includes a box for encapsulating one or more battery cells. The box can prevent liquids or other foreign objects from affecting the charging or discharging of the battery cells.

[0069] The battery cell includes an electrode assembly and an electrolyte. The electrode assembly includes a positive electrode sheet, a negative electrode sheet and a separator. The battery cell mainly works by the movement of metal ions between the positive electrode sheet and the negative electrode sheet. The positive electrode sheet includes a positive electrode current collector and a positive electrode active material layer, and the positive electrode active material layer is coated on the surface of the positive electrode current collector; the positive electrode current collector includes a positive electrode current collecting part and a welding part for connecting the positive electrode tab, the positive electrode current collecting part is coated with the positive electrode active material layer, and the positive electrode tab is not coated with the positive electrode active material layer. Taking a lithium-ion battery as an example, the material of the positive electrode current collector can be aluminum, and the positive electrode active material layer includes a positive electrode active material, and the positive electrode active material can be lithium cobaltate, lithium iron phosphate, ternary lithium or lithium manganate, etc. The negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer, and the negative electrode active material layer is coated on the surface of the negative electrode current collector; the negative electrode current collector includes a negative electrode current collecting part and a welding part for connecting the negative electrode tab, the negative electrode current collecting part is coated with the negative electrode active material layer, and the negative electrode tab is not coated with the negative electrode active material layer. The material of the negative electrode current collector can be copper, and the negative electrode active material layer includes a negative electrode active material, and the negative electrode active material can be carbon or silicon, etc. The material of the separator can be PP (polypropylene) or PE (polyethylene), etc.

[0070] It should be understood that the technical solutions described in the embodiments of the present application are not only limited to the battery devices and electrical equipment described above, but also applicable to all battery devices including boxes and electrical equipment using battery devices. However, for the sake of simplicity of description, the following embodiments are all described by taking an electric vehicle as an example.

[0071] Please refer to Figure 1 , Figure 1Schematic diagram of the structure of vehicle 1 provided by some embodiments of the present application. Vehicle 1 can be a fuel vehicle, a gas vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle, an extended-range vehicle, etc. A battery device 2 is provided inside vehicle 1. The battery device 2 can be arranged at the bottom, head, or tail of vehicle 1. The battery device 2 can be used to supply power to vehicle 1. For example, the battery device 2 can serve as the operating power source of vehicle 1. Vehicle 1 can also include a controller 102 and a motor 101. The controller 102 is used to control the battery to supply power to the motor 101. For example, it is used for the working power requirements during the start, navigation, and driving of vehicle 1.

[0072] In some embodiments of the present application, the battery device 2 can not only serve as the operating power source of vehicle 1, but also serve as the driving power source of vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for vehicle 1.

[0073] Figure 2 Schematic diagram of the structure of the battery device according to an embodiment of the present application is shown.

[0074] The battery device 2 mentioned in the embodiments of the present application may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly may include a plurality of battery cells 3. The plurality of battery cells 3 are connected in series, parallel, or in a hybrid connection through a busbar component.

[0075] In some embodiments, the battery cell assembly is generally formed by arranging a plurality of battery cells 3.

[0076] As an example, the battery cell assembly can be a battery module 201. The battery module 201 is formed by arranging and fixing a plurality of battery cells 3 into an independent module. As an example, the battery module 201 can be formed by bundling a plurality of battery cells 3 with cable ties.

[0077] In some embodiments, the battery device can be a battery pack. The battery pack includes a box body 202 and one or more battery cell assemblies. The battery cell assemblies are accommodated in the box body 202.

[0078] As an example, the battery cell assembly can be a battery module 201. The battery cell assembly can be accommodated in the box body by fixing the battery module 201 in the box body.

[0079] As an example, the battery cell assembly can also be accommodated in the box body 202 by directly fixing a plurality of battery cells 3 to the box body 202.

[0080] As an example, the housing 202 may include a first housing 2021 and a second housing 2022. The first housing 2021 and the second housing 2022 are snapped together so that a closed space is formed inside the housing 202 to accommodate the battery cell assembly. The term "closed" here means covered or closed, which can be sealed or non-sealed. The first housing 2021 may be an end cap or a bottom plate.

[0081] As an example, the housing 202 may include an end cap, a frame, and a bottom plate. The end cap and the bottom plate are respectively connected to the frame so that a closed space is formed inside the housing 202 to accommodate the battery cell assembly.

[0082] In some embodiments, the housing 202 may be part of the chassis structure of a vehicle. For example, a part of the housing 202 may form at least a part of the floor of the vehicle, or a part of the housing 202 may form at least a part of the cross member and longitudinal member of the vehicle.

[0083] Figure 3 The structural schematic diagram of a battery module 201 according to an embodiment of the present application is shown.

[0084] In some embodiments, as Figure 2 and Figure 3 shown, there are multiple battery cells 3. The multiple battery cells 3 are first connected in series, parallel, or in a hybrid connection to form the battery module 201. The multiple battery modules 201 are then connected in series, parallel, or in a hybrid connection to form a whole and are accommodated in the housing 202.

[0085] The multiple battery cells 3 in the battery module 201 can be electrically connected through a busbar component to achieve parallel, series, or hybrid connection of the multiple battery cells 3 in the battery module 201.

[0086] Figure 4 is an exploded view of a battery cell provided by an embodiment of the present application. The battery cell 3 refers to the smallest unit that makes up a battery. As Figure 4 shown, the battery cell 3 includes an end cap assembly 6, a housing 4, and an electrode assembly 5.

[0087] The electrode assembly 5 is the component in the battery cell 3 where an electrochemical reaction occurs. The housing 4 may contain one or more electrode assemblies 5. The electrode assembly 5 is mainly formed by winding or stacking electrode plates. The electrode plates are divided into positive electrode plates and negative electrode plates, and usually an insulating separator is provided between the positive electrode plate and the negative electrode plate. The parts of the positive electrode plate and the negative electrode plate with active materials constitute the electrode body, and the parts of the positive electrode plate and the negative electrode plate without active materials respectively constitute the electrode tabs. The positive electrode tab and the negative electrode tab can be located at one end of the electrode body together or at both ends of the electrode body respectively. During the charging and discharging process of the battery cell 3, the positive active material and the negative active material react with the electrolyte, and the electrode tabs are connected to the electrode terminals to form a current loop.

[0088] The electrode assembly 5 can be a wound structure, a stacked structure, or a hybrid structure of winding and stacking.

[0089] In some embodiments, the electrode assembly 5 is a wound structure. The positive electrode sheet and the negative electrode sheet are wound into a wound structure.

[0090] In some embodiments, the electrode assembly 5 is a stacked structure. As an example, multiple positive electrode sheets and multiple negative electrode sheets can be respectively provided. The multiple positive electrode sheets and the multiple negative electrode sheets are alternately stacked. Multiple separators can be provided and are respectively disposed between any adjacent positive electrode sheet or negative electrode sheet. Alternatively, the separators can be continuously provided and are disposed between any adjacent positive electrode sheet or negative electrode sheet in a folded manner.

[0091] In some embodiments, the shape of the electrode assembly 5 can be cylindrical, flat, prismatic, etc.

[0092] In some embodiments, the electrode assembly 5 is provided with tabs. The tabs can conduct current out of the electrode assembly. The tabs include a positive tab and a negative tab.

[0093] The battery cell 3 can include a housing. The housing 4 is a component for cooperating with the end cap assembly 6 to form the internal environment of the battery cell 3. Among them, the formed internal environment can be used to accommodate the electrode assembly 5, the electrolyte (not shown in the figure), and other components. The housing 4 can be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite housing), or an aluminum-plastic film, etc. In some embodiments, the housing 4 can be a sealed structure or a non-sealed structure. As an example, when the housing 4 is a non-sealed structure, the housing 4 plays a role in protecting the electrode assembly 5. A sealed bag is further included between the housing 4 and the electrode assembly 5. The sealed bag is used to encapsulate the electrode assembly and the electrolyte. Specifically, the sealed bag can be a bag-shaped insulating part or an aluminum-plastic film. When the housing 4 is a sealed structure, it is used to encapsulate components such as the electrode assembly 5 and the electrolyte.

[0094] As an example, the battery cell 3 can be a cylindrical battery cell, a prismatic battery cell, a soft-pack battery cell, or a battery cell of other shapes. The prismatic battery cell includes a square-shell battery cell, a blade-shaped battery cell, a multi-prismatic battery. The multi-prismatic battery is, for example, a hexagonal-prismatic battery, etc. There is no special limitation in this application.

[0095] The housing 4 and the end cap assembly 6 can be independent components. One or more openings can be provided on the housing 4. One or more end cap assemblies 6 cover the openings to form the internal environment of the battery cell 3. Optionally, the end cap assembly 6 and the housing 4 can also be integrated. Optionally, the end cap assembly 6 and the housing 4 can first form a common connection surface before other components are put into the housing. When it is necessary to encapsulate the inside of the housing 4, then the end cap assembly 6 covers the housing 4.

[0096] In some embodiments, the electrode terminal 61 can be disposed on the end cap assembly 6 or on the housing 4, and the electrode terminal 61 is electrically connected to the tab. The electrode terminal 61 can be directly connected to the tab or indirectly connected to the tab through a transfer mechanism.

[0097] Please refer to Figure 5 and Figure 6 , Figure 5 which is a schematic structural diagram of a battery cell provided by an embodiment of the present application.

[0098] In a first aspect, as Figures 4 to 6 shown, the present application provides a battery cell 3, which includes a housing 4, an end cap assembly 6, and an insulating assembly 7. The housing 4 includes a chamber 41 with an opening; the end cap assembly 6 includes an end cap plate 62 and an electrode terminal 61. The end cap plate 62 covers the opening. The end cap plate 62 includes a protruding portion 622 and a connecting portion 621. The electrode terminal 61 is disposed on the connecting portion 621. The protruding portion 622 protrudes in a direction away from the chamber 41 relative to the connecting portion 621; the insulating assembly 7 includes a first insulating portion 731 and a second insulating portion 732. The first insulating portion 731 is disposed on the connecting portion 621, and the second insulating portion 732 is disposed on the protruding portion 622. Wherein, the insulating assembly 7 is configured to melt the first insulating portion 731 at a first preset temperature and melt the second insulating portion 732 at a second preset temperature, and the second preset temperature is greater than the first preset temperature.

[0099] In the solution of the embodiment of the present application, the battery cell 3 includes a housing 4, an end cap assembly 6, and an insulating assembly 7. The end cap assembly 6 includes an end cap plate 62 and an electrode terminal 61. The end cap plate 62 covers the opening of the housing 4. The end cap plate 62 includes a protruding portion 622 and a connecting portion 621. The electrode terminal 61 is disposed on the connecting portion 621. The protruding portion 622 protrudes in a direction away from the chamber 41 relative to the connecting portion 621. The insulating assembly 7 includes a first insulating portion 731 and a second insulating portion 732. The first insulating portion 731 is disposed on the connecting portion 621, and the second insulating portion 732 is disposed on the protruding portion 622 to insulate the end cap plate 62 from other components. The insulating assembly 7 is configured to melt the first insulating portion 731 at a first preset temperature and melt the second insulating portion 732 at a second preset temperature. By setting the second preset temperature to be greater than the first preset temperature, the problem that when the protruding portion 622 is provided on the end cap plate 62, the distance between the electrode terminal 61 and / or the electrical connection member 203 and the second insulating portion 732 becomes smaller, and the second insulating portion 732 is easily melted by heat, and the risk of short circuit between the end cap plate 62 and other devices is increased is improved, and the reliability of the battery cell 3 is enhanced.

[0100] Specifically, the housing 4 includes a chamber 41 that is open at at least one end in its first direction X. The battery cell 3 further includes an electrode assembly 5, which is received in the chamber 41. The end cover plate 62 covers the opening, and the electrode terminal 61 is connected to the electrode assembly 5.

[0101] Optionally, the end cover plate 62 includes a protruding portion 622 and a connecting portion 621. A partial area of the end cover plate 62 protrudes away from the housing 4 to form the protruding portion 622. The electrode terminal 61 is disposed on the connecting portion 621. A through hole is provided on the connecting portion 621. One end of the electrode terminal 61 is connected to the electrode assembly 5 through this through hole, and the other end is used to connect to the electrical connector 203. Exemplarily, the electrical connector 203 can be a bus bar.

[0102] Optionally, the specific setting positions, numbers, and shapes of the protruding portion 622 and the connecting portion 621 can be designed by oneself. Exemplarily, the protruding portion 622 is disposed in the middle region of the end cover plate 62 in the second direction Y, and the two connecting portions 621 are respectively disposed at both ends of the end cover plate 62 in its second direction Y, or the protruding portion 622 is disposed in the middle region of the end cover plate 62 in the second direction Y, and the connecting portion 621 is disposed around the protruding portion 622, or a plurality of protruding portions 622 and a plurality of connecting portions 621 are arranged at intervals in the second direction Y.

[0103] Optionally, the protruding portion 622 is formed with a groove facing the housing 4, so as to increase the internal space of the battery cell 3 after the end cover plate 62 covers the housing 4.

[0104] Specifically, the first insulating portion 731 is disposed on the outer surface of the connecting portion 621, that is, the first insulating portion 731 is disposed on the surface of the connecting portion 621 facing away from the chamber 41; the second insulating portion 732 is disposed on the outer surface of the protruding portion 622, that is, the second insulating portion 732 is disposed on the surface of the connecting portion 621 facing away from the chamber 41, so that the connecting portion 621 and the protruding portion 622 can be insulated from external devices (such as the electrical connector 203) through the first insulating portion 731 and the second insulating portion 732.

[0105] The first insulating portion 731 is provided with a through hole for avoiding the electrode terminal 61.

[0106] Optionally, the first insulating portion 731 and the second insulating portion 732 are connected to each other, so that the insulating component 7 provides a more perfect insulating effect for the end cover assembly 6.

[0107] The materials of the first insulating portion 731 and the second insulating portion 732 can include polyimide, polyethylene, ceramic, polyethylene terephthalate, etc. The material types of the first insulating portion 731 and the second insulating portion 732 are the same or different.

[0108] The insulation assembly 7 is configured to melt the first insulation part 731 at a first preset temperature and melt the second insulation part 732 at a second preset temperature, which means that when the insulation assembly 7 is in an environment with the first preset temperature, after a preset time t, the first insulation part 731 will melt; when the insulation assembly 7 is in an environment with the second preset temperature, after a preset time t, the second insulation part 732 will melt. The specific values of the first preset temperature, the second preset temperature, and the preset time can be designed by oneself and are not limited here.

[0109] It should be clear that the first preset temperature and the second preset temperature are not the surface temperatures of the first insulation part 731 and the second insulation part 732, but the ambient temperature on the peripheral side of the insulation assembly 7.

[0110] Exemplarily, after the insulation assembly 7 is assembled to the battery cell 3, a heat source spaced apart from it is provided on the peripheral side of the insulation assembly 7. The same area of test regions are taken on the first insulation part 731 and the second insulation part 732 respectively, and the distances from the heat source to the two test regions are the same. Then when the heat source is at the first preset temperature, the test region of the first insulation part 731 melts, and when the heat source is at the second preset temperature, the test region of the second insulation part 732 melts.

[0111] In the related art, the electrical connector 203 and the electrode terminal 61 conduct electricity to generate heat. The end cover plate 62 is usually a flat plate, and the insulation assembly 7 covers the surface of the end cover plate 62. However, in the embodiment of the present application, with the provision of the convex portion 622, the distance between the electrical connector 203 and / or the electrode terminal 61 and the second insulation part 732 is reduced, the second insulation part 732 is heated more, and the risk of melting of the second insulation part 732 is increased.

[0112] However, in the embodiment of the present application, the second preset temperature is greater than the first preset temperature, that is, after the insulation assembly 7 is arranged on the end cover assembly 6, the second insulation part 732 can withstand a higher temperature compared with the first insulation part 731, so the risk of melting of the second insulation part 732 can be reduced.

[0113] Exemplarily, the purpose that the second insulation part 732 can withstand a higher temperature compared with the first insulation part 731 can be achieved by methods such as replacing the material of the second insulation part 732 to increase the melting point of the second insulation part 732, providing a heat insulation layer on the second insulation part 732 to block at least part of the heat acting on the second insulation part 732 from the outside, and enhancing the heat dissipation efficiency of the second insulation part 732 to improve the temperature rise of the second insulation part 732.

[0114] Please refer to Figure 7 , Figure 7 which is a side view of a battery cell provided by an embodiment of the present application.

[0115] In some embodiments, such as Figures 5 to 7As shown, the electrode terminal 61 includes a connection area 611 for connecting to the electrical connector 203. The minimum distance S from the connection area 611 to the first insulating part 731 1 , and the minimum distance S from the connection area 611 to the second insulating part 732 2 , satisfy S 2 < S 1 .

[0116] In these embodiments, when the minimum distance from the connection area 611 to the second insulating part 732 satisfies the above conditions, by setting the melting point of the second insulating part 732 to be greater than that of the first insulating part 731, the risk of the connection area 611 melting through the second insulating part 732 due to the temperature can be effectively reduced, and the reliability of the insulating component 7 can be improved.

[0117] The electrical connector 203 is connected to the connection area 611 of the electrode terminal 61. The specific position, shape, and area of the connection area 611 on the electrode terminal 61 can be designed according to actual situations. Exemplarily, the connection area 611 is provided on the end face of the electrode terminal 61 facing away from the electrode assembly 5.

[0118] Due to overcurrent heat generation in the electrical connector 203 and the electrode terminal 61, in the area where the electrical connector 203 and the electrode terminal 61 are connected, due to the contact resistance, its resistance value is larger and more heat is generated, that is, the temperature of the connection area 611 is higher than that of other areas of the electrode terminal 61.

[0119] Considering the minimum distance S from the connection area 611 to the first insulating part 731 1 , and in this case the first insulating part 731 is not melted through, then when the minimum distance S from the connection area 611 to the second insulating part 732 2 ≥ S 1 , the melting risk of the second insulating part 732 is relatively low; while when the minimum distance S from the connection area 611 to the second insulating part 732 2 < S 1 , the distance between the second insulating part 732 and the connection area 611 is small, and the melting risk of the second insulating part 732 increases. At this time, improving the insulating component 7 to increase the temperature range that the second insulating part 732 can withstand can effectively reduce the melting risk of the second insulating part 732.

[0120] Exemplarily, the insulating component 7 is provided on the end cover component 6. When the electrode terminal 61 is connected to the electrical connector, when the temperature at the connection area 611 reaches the first preset temperature, the first insulating part 731 melts, and when the temperature at the connection area 611 reaches the second preset temperature, the second insulating part 732 melts.

[0121] Optionally, the second insulating part 732 includes a fusible area, and the distances from the fusible area to the connection area 611 are all less than S1 , the ability of the fusible region to withstand high temperatures can be improved only in the second insulating portion 732, so as to reduce the manufacturing cost of the insulating component 7.

[0122] Please refer to Figure 8 , Figure 8 , which is a schematic structural diagram of an insulating component of a battery cell provided by an embodiment of the present application.

[0123] In some embodiments, as Figures 4 to 6 and Figure 8 shown, the insulating component 7 further includes a heat insulating portion 74, and the heat insulating portion 74 is disposed on a side of the second insulating portion 732 facing away from the end cover plate 62.

[0124] In these embodiments, the heat insulating portion 74 is disposed on a side of the second insulating portion 732 facing away from the end cover plate 62, and the heat insulating portion 74 blocks at least part of the heat conducted by the electrical connection member 203 and / or the electrode terminal 61 to the second insulating portion 732, so as to reduce the risk of the second insulating portion 732 being melted through by heat.

[0125] The heat insulating portion 74 is disposed on a side of the second insulating portion 732 facing away from the end cover plate 62. By blocking the external heat with the heat insulating portion 74, the influence of the external heat on the second insulating portion 732 is reduced, so that the second insulating portion 732 can withstand a higher temperature.

[0126] Optionally, the material of the heat insulating portion 74 can be ceramic fiber, silica gel, glass fiber, rubber, aerogel, etc.

[0127] Optionally, the heat insulating portion 74 can be disposed on the first insulating portion 731 in a form of bonding, coating or vacuum adsorption.

[0128] Optionally, the heat insulating portion 74 can be a plate-shaped heat insulating plate member or a layer-shaped heat insulating coating, etc.

[0129] Optionally, the heat insulating portion 74 is disposed on at least part of the surface of the second insulating portion 732 facing away from the end cover plate 62. Exemplarily, the heat insulating portion 74 is only disposed in the fusible region to save the material cost of the insulating component 7; or the heat insulating portion 74 covers the entire second insulating portion 732 to improve the heat insulating reliability of the heat insulating portion 74.

[0130] Optionally, the second insulating portion 732 includes a receiving space 733, and the heat insulating portion 74 is disposed in the receiving space 733, so that the heat insulating portion 74 is insulated from other devices through a sub-insulating layer, and the heat insulating portion 74 is fixed by the second insulating portion 732, reducing the risk of the heat insulating portion 74 being displaced and falling off.

[0131] Please refer to Figure 9 and Figure 10 , Figure 9 , which is a schematic structural diagram of an insulating component of a battery cell provided by another embodiment of the present application;Figure 10 Yes Figure 9 It is a schematic enlarged view of the structure at position A in the figure.

[0132] In some embodiments, such as Figure 4 , Figure 5 , Figure 8 and Figure 9 shown, the insulating component 7 further includes a heat conducting portion 75. The second insulating portion 732 includes a receiving space 733. The heat conducting portion 75 is disposed in the receiving space 733, or the heat conducting portion 75 is disposed on a side of the second insulating portion 732 facing away from the end cover plate 62.

[0133] In these embodiments, disposing the heat conducting portion 75 in the receiving space 733 of the second insulating portion 732 helps to improve the insulation performance between the heat conducting portion 75 and other devices. Or disposing the heat conducting portion 75 on a side of the second insulating portion 732 facing away from the end cover plate 62 helps to reduce the processing difficulty of the insulating component 7. The heat conducting portion 75 disposed on the second insulating portion 732 can transfer the heat conducted from the electrical connection member 203 and / or the electrode terminal 61 to the second insulating portion 732 to the outside, thereby reducing the risk of the second insulating portion 732 being melted through by heat.

[0134] When the heat conducting portion 75 is disposed on a side of the second insulating portion 732 facing away from the end cover plate 62, the heat of the second insulating portion 732 is conducted through the heat conducting portion 75, reducing the heat accumulated in the second insulating portion 732, so that the second insulating portion 732 can withstand a higher temperature.

[0135] Optionally, the second insulating portion 732 includes two sub-insulating layers, and the two sub-insulating layers are spaced apart to form the receiving space 733; or the edges of the two sub-insulating layers are connected to form the receiving space 733 in the middle thereof.

[0136] Optionally, one end of the heat conducting portion 75 extends to the fusible area, so that the heat conducting portion 75 can transfer the heat in the fusible area to other parts to relieve the temperature rise in the fusible area.

[0137] Optionally, the orthographic projection of the heat conducting portion 75 in its thickness direction covers the second insulating portion 732, so that the heat conducting portion 75 can effectively conduct and equalize the temperature of the second insulating portion 732.

[0138] Optionally, when the heat conducting portion 75 is disposed in the receiving space 733, the heat conducting portion 75 is insulated from other components through the second insulating portion 732, and the material selection range of the heat conducting portion 75 is larger. Exemplarily, the heat conducting portion 75 can be a metal material, a graphite material, a silicone heat conducting material, etc. Exemplarily, the heat conducting portion 75 is a copper foil, and the thickness of the copper foil is between 0.01 mm and 0.5 mm. Exemplarily, the thickness of the copper foil is 0.01 mm, 0.1 mm, 0.3 mm, 0.5 mm, etc.

[0139] Optionally, when the heat-conducting part 75 is disposed on the side of the second insulating part 732 away from the end cover plate 62, the processing difficulty is low, and the heat-conducting part 75 receives and conducts temperature more directly. At this time, the heat-conducting part 75 should be made of insulating material. Exemplarily, the heat-conducting part 75 can be made of materials such as aluminum nitride, alumina, anodized aluminum, diamond, etc.

[0140] Please refer to Figure 11 , Figure 11 which is an exploded view of a battery cell provided by another embodiment of the present application.

[0141] In some embodiments, as Figure 11 shown, the first insulating part 731 and the second insulating part 732 are formed separately.

[0142] In these embodiments, the first insulating part 731 and the second insulating part 732 are formed separately to facilitate adjusting the materials and dimensions of the first insulating part 731 and the second insulating part 732, so as to improve the adaptability of the insulating component 7 and the end cover components 6 of different specifications.

[0143] After the first insulating part 731 and the second insulating part 732 are formed separately, they are respectively disposed on the connecting part 621 and the protruding part 622 by means of bonding or vacuum adsorption. The materials of the first insulating part 731 and the second insulating part 732 are the same or different.

[0144] Optionally, the first insulating part 731 and the second insulating part 732 are connected together by an insulating colloid, and the insulating colloid fills the gap between the first insulating part 731 and the second insulating part 732 to improve the overall insulation performance of the insulating component 7.

[0145] Optionally, only the second insulating part 732 forms a receiving space 733 for receiving the heat-conducting part 75.

[0146] In some embodiments, as Figure 10 shown, the melting point of the second insulating part 732 is greater than that of the first insulating part 731.

[0147] In these embodiments, the melting point of the second insulating part 732 is greater than that of the first insulating part 731, which not only reduces the risk of melting through of the second insulating part 732, but also helps to reduce the thickness of the second insulating part 732 and improve the energy density of the battery cell 3.

[0148] The first insulating part 731 and the second insulating part 732 are formed separately, and different materials can be used for the first insulating part 731 and the second insulating part 732 so that the melting point of the second insulating part 732 is greater than that of the first insulating part 731. Exemplarily, the material of the first insulating part 731 can be polyethylene, polyethylene terephthalate, etc., and the material of the second insulating part 732 can be polyimide or ceramic, etc.

[0149] Optionally, while using a material with a higher melting point for the second insulating portion 732, the heat insulating portion 74 or the heat conducting portion 75 can also be provided on the second insulating portion 732 to enhance the high temperature resistance of the second insulating portion 732.

[0150] Please refer to Figure 12 , Figure 12 which is an exploded view of a battery cell provided by another embodiment of the present application.

[0151] In some embodiments, as Figure 12 shown, the first insulating portion 731 and the second insulating portion 732 are integrally formed.

[0152] In these embodiments, the first insulating portion 731 and the second insulating portion 732 are integrally formed, and there are no splicing gaps or partition structures in the overall insulating component 7, so the stress dispersion effect is better when facing external impacts and vibrations.

[0153] Specifically, the first insulating portion 731 and the second insulating portion 732 are integrally formed. The first insulating portion 731 and the second insulating portion 732 are a single entity, and they are made of the same material. The high temperature resistance of the second insulating portion 732 can be enhanced by providing the heat insulating portion 74 or the heat conducting portion 75 on the second insulating portion 732.

[0154] Optionally, the heat insulating portion 74 or the heat conducting portion 75 can extend to the first insulating portion 731 and the second insulating portion 732 to enhance the overall high temperature resistance of the insulating component 7.

[0155] Optionally, the first insulating portion 731 and the second insulating portion 732 are a single entity, and this entity includes a receiving space 733 capable of receiving the heat conducting portion 75.

[0156] Please refer to Figure 13 , Figure 13 which is an exploded view of a battery cell provided by another embodiment of the present application.

[0157] In some embodiments, as Figure 13 shown, the protruding portion 622 includes an end wall 623 and a side wall 624. The side wall 624 is connected to the end wall 623 and the connecting portion 621. The battery cell 3 further includes an adhesive member 9. The adhesive member 9 is provided between the connecting portion 621 and the first insulating portion 731, and between the second insulating portion 732 and the end wall 623. The side wall 624 and the adhesive member 9 are spaced apart.

[0158] In these embodiments, the first insulating portion 731 and the second insulating portion 732 are fixed to the end cover plate 62 by the adhesive member 9, and the side wall 624 and the adhesive member 9 are spaced apart. On the one hand, the volume of the adhesive member 9 can be reduced, and the processing cost of the battery cell 3 can be lowered. On the other hand, it also helps to reduce the difficulty of replacing and repairing the insulating component 7.

[0159] Optionally, the bonding member 9 can be double-sided tape, dot glue, etc.

[0160] The first insulating portion 731 and the second insulating portion 732 are an integral body. The side wall 624 is disposed between the end wall 623 and the connecting portion 621. When bonding spaces are provided between the connecting portion 621 and the first insulating portion 731, and between the second insulating portion 732 and the end wall 623, the first insulating portion 731 and the second insulating portion can be stably connected to the end cover plate 62.

[0161] Optionally, the connecting portion 621 is disposed around the protruding portion 622 to improve the problem that external impurities invade the inside of the end cover assembly 6 through the gap between the side wall 624 and the second insulating portion 732.

[0162] The side wall 624 and the bonding member 9 are spaced apart, that is, the bonding member 9 is not provided on the side wall 624, which reduces the difficulty of setting the bonding member 9, the difficulty of the second insulating portion 732 detaching from the end cover plate 62 during maintenance and replacement, and the difficulty of cleaning residual glue.

[0163] Please refer to Figure 14 , Figure 14 which is an exploded view of the battery cell provided by another embodiment of the present application.

[0164] In some embodiments, as Figure 13 shown, the battery cell 3 further includes a pressure relief mechanism 8. The pressure relief mechanism 8 is disposed on the protruding portion 622, and at least a part of the second insulating portion 732 in its thickness direction coincides with the pressure relief mechanism 8.

[0165] In these embodiments, at least a part of the second insulating portion 732 in its thickness direction coincides with the pressure relief mechanism 8. The second insulating portion 732 can help the pressure relief mechanism 8 block external impurities, so as to improve the problem that the external impurities block the pressure relief mechanism 8 and enhance the reliability of the battery cell 3.

[0166] Optionally, the second insulating portion 732 completely covers the pressure relief mechanism 8, further improving the problem that the external impurities block the pressure relief mechanism 8 and enhancing the reliability of the battery cell 3.

[0167] Exemplarily, when the pressure relief mechanisms 8 of adjacent battery cells 3 are actuated, the emissions of the adjacent battery cells 3 can be blocked by the second insulating portion 732, so as to reduce the risk that the pressure relief mechanism 8 cannot be normally actuated due to the accumulation of emissions on the pressure relief mechanism 8.

[0168] As an example, the pressure relief mechanism 8 is actuated to release the internal pressure or temperature when the internal pressure or temperature of the battery cell 3 reaches a predetermined threshold. When the internal pressure or temperature of the battery cell 3 reaches the predetermined threshold, the pressure relief mechanism 8 performs an action or a weak structure provided in the pressure relief mechanism 8 is damaged, thereby forming an opening or a channel for releasing the internal pressure or temperature. This threshold design varies according to different design requirements. The threshold may depend on one or several materials among the positive electrode plate, negative electrode plate, electrolyte, and separator membrane in the battery cell 3.

[0169] As an example, the pressure relief mechanism 8 can be integrally formed with the housing 4. For example, a notch is made on the housing 4 to form a weak structure, and this weak structure serves as the pressure relief mechanism 8.

[0170] As the pressure relief mechanism 8 can also be separately provided and connected to the housing 4. For example, the pressure relief mechanism 8 is welded to the housing 4 or connected through other components. As an example, a notch is provided on the pressure relief mechanism 8 to form a weak structure.

[0171] As an example, the pressure relief mechanism 8 can be in the form of, such as, an explosion-proof valve, a balance valve, a gas valve, a pressure relief valve, or a safety valve, etc.

[0172] The "actuation" mentioned in this application means that the pressure relief mechanism 8 generates an action or is activated to a certain state, so that the internal pressure and temperature of the battery cell 3 can be released. The actions generated by the pressure relief mechanism 8 can include, but are not limited to: the components in the pressure relief mechanism 8 move to form an exhaust channel, at least a part of the pressure relief mechanism 8 breaks, shatters, is torn, or opens, etc. When the pressure relief mechanism 8 is actuated, the high-temperature and high-pressure substances inside the battery cell 3 will be discharged outward from the actuated part as emissions. In this way, the battery cell 3 can be depressurized and cooled under a controllable pressure or temperature, thereby avoiding potential more serious accidents.

[0173] The emissions from the battery cell 3 mentioned in this application include, but are not limited to: electrolyte, dissolved or split positive and negative electrode plates, fragments of the separator membrane, high-temperature and high-pressure gases generated by the reaction, flames, etc.

[0174] Please refer to Figure 15 , Figure 15 which is a schematic structural diagram of the insulation assembly of the battery cell provided by another embodiment of this application.

[0175] In some embodiments, such as Figure 14 and Figure 15As shown, the second insulating portion 732 includes a main body portion 734 and a shielding portion 735. The main body portion 734 is connected to the first insulating portion 731 and the shielding portion 735. At least a partial orthographic projection of the shielding portion 735 in its thickness direction is located within the pressure relief mechanism 8. The main body portion 734 and the shielding portion 735 are connected by a weakening structure 736.

[0176] In these embodiments, the main body portion 734 and the shielding portion 735 are connected by a weakening structure 736 to facilitate the detachment of the shielding portion 735 and the main body portion 734 when the pressure relief mechanism 8 is activated, so as to reduce the hindrance of the insulating component 7 to the pressure relief mechanism 8 and improve the reliability of the pressure relief mechanism 8.

[0177] The main body portion 734 and the shielding portion 735 are connected by a weakening structure 736. The weakening structure 736 reduces the connection strength between the main body portion 734 and the shielding portion 735, so that when the pressure relief mechanism 8 is actuated, the pressure exerted by the expelled matter on the shielding portion 735 can cause the second insulating portion 732 to break at the weakening structure 736, the main body portion 734 and the shielding portion 735 are separated, and the battery cell 3 is exhausted and depressurized by the pressure relief mechanism 8.

[0178] Exemplarily, the weakening structure 736 can be a scoring groove provided between the main body portion 734 and the shielding portion 735 and surrounding the shielding portion 735, or the weakening structure 736 can be a plurality of through holes provided between the main body portion 734 and the shielding portion 735 and spaced around the shielding portion 735 to form a breaking line.

[0179] Optionally, the orthographic projection of the shielding portion 735 in its thickness direction covers the entire pressure relief mechanism 8 to reduce the hindrance of the second insulating portion 732 to the pressure relief mechanism 8.

[0180] In a second aspect, as Figures 4 to 6 shown, the present application provides a battery device 2, including the battery cell 3 of the above first aspect embodiments.

[0181] Since the battery device 2 provided in the second aspect embodiments of the present application includes the battery cell 3 of any one of the above first aspect embodiments, the battery device 2 provided in the second aspect embodiments of the present application has the beneficial effects of the battery cell 3 of any one of the above first aspect embodiments, which will not be elaborated herein.

[0182] In a third aspect, the present application provides an electrical device, including the battery device of the above second aspect embodiments.

[0183] Since the electrical device provided in the third aspect embodiments of the present application includes the battery device of any one of the above second aspect embodiments, the electrical device provided in the third aspect embodiments of the present application has the beneficial effects of the battery device of the above second aspect embodiments, which will not be elaborated herein.

[0184] In some embodiments, as Figures 1 to 15 shown, the battery cell 3 includes a housing 4, an end cap assembly 6, an insulating assembly 7, an adhesive 9, and a pressure relief mechanism 8. The housing 4 includes a chamber 41 with an opening; the end cap assembly 6 includes an end cap plate 62 and electrode terminals 61. The end cap plate 62 covers the opening. The end cap plate 62 includes a protruding portion 622 and a connecting portion 621. The electrode terminals 61 are disposed on the connecting portion 621, and the pressure relief mechanism 8 is disposed on the protruding portion 622. The protruding portion 622 protrudes from the connecting portion 621 in a direction away from the chamber 41; the insulating assembly 7 includes a first insulating portion 731 and a second insulating portion 732. The first insulating portion 731 is disposed on the connecting portion 621, and the second insulating portion 732 is disposed on the protruding portion 622. The insulating assembly 7 is configured such that the first insulating portion 731 melts at a first preset temperature and the second insulating portion 732 melts at a second preset temperature, and the second preset temperature is greater than the first preset temperature. Wherein, the insulating assembly 7 further includes a heat insulating portion 74 or a heat conducting portion 75. The heat insulating portion 74 is disposed on a side of the second insulating portion 732 away from the end cap plate 62. The second insulating portion 732 includes a receiving space 733. The heat conducting portion 75 is disposed within the receiving space 733. The first insulating portion 731 and the second insulating portion 732 are formed separately, and the melting point of the second insulating portion 732 is greater than that of the first insulating portion 731, or the first insulating portion 731 and the second insulating portion 732 are integrally formed. The protruding portion 622 includes an end wall 623 and a side wall 624. The side wall 624 is connected to the end wall 623 and the connecting portion 621. The adhesive 9 is disposed between the connecting portion 621 and the first insulating portion 731, and between the second insulating portion 732 and the end wall 623. The side wall 624 and the adhesive 9 are spaced apart. The second insulating portion 732 includes a main body portion 734 and a shielding portion 735. The main body portion 734 is connected to the first insulating portion 731 and the shielding portion 735. At least a part of the orthographic projection of the shielding portion 735 in its thickness direction is located within the pressure relief mechanism 8. The main body portion 734 and the shielding portion 735 are connected by a weakening structure 736.

[0185] In these embodiments, the battery cell 3 includes a housing 4, an end cap assembly 6, and an insulating assembly 7. The end cap assembly 6 includes an end cap plate 62 and electrode terminals 61. The end cap plate 62 covers the opening of the housing 4. The end cap plate 62 includes a protruding portion 622 and a connecting portion 621. The electrode terminals 61 are disposed on the connecting portion 621. The protruding portion 622 protrudes relative to the connecting portion 621 in a direction away from the chamber 41. The insulating assembly 7 includes a first insulating portion 731 and a second insulating portion 732. The first insulating portion 731 is disposed on the connecting portion 621, and the second insulating portion 732 is disposed on the protruding portion 622 to insulate the end cap plate 62 from other components. The insulating assembly 7 is configured such that the first insulating portion 731 melts at a first preset temperature and the second insulating portion 732 melts at a second preset temperature. By setting the second preset temperature to be greater than the first preset temperature, the problem that when a protruding portion 622 is provided on the end cap plate 62, the distance between the electrode terminal 61 and / or the electrical connector 203 and the second insulating portion 732 becomes smaller, and the second insulating portion 732 is easily melted by heat, increasing the risk of short circuit due to the overlap between the end cap plate 62 and other devices is improved, and the reliability of the battery cell 3 is enhanced.

[0186] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit them. Although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features. These modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be covered within the scope of the claims and the description of the present application. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized in that: include: a housing including a chamber having an opening; An end cap assembly, comprising an end cap plate and an electrode terminal, wherein the end cap plate covers the opening, the end cap plate comprises a protruding portion and a connecting portion, the electrode terminal is arranged on the connecting portion, and the protruding portion is arranged to protrude relative to the connecting portion in a direction away from the chamber; The insulating component comprises a first insulating portion and a second insulating portion, wherein the first insulating portion is arranged on the connecting portion, and the second insulating portion is arranged on the protruding portion. The insulating component is configured such that the first insulating part melts at a first preset temperature and the second insulating part melts at a second preset temperature, and the second preset temperature is greater than the first preset temperature.

2. The battery cell according to claim 1, characterized in that: The insulation assembly further includes a heat insulation portion, which is arranged on a side of the second insulation portion facing away from the end cover plate.

3. The battery cell according to claim 1, characterized in that: The insulating assembly further includes a heat conducting part, the second insulating part includes a containing space, the heat conducting part is arranged in the containing space, or the heat conducting part is arranged on a side of the second insulating part away from the end cover plate.

4. The battery cell according to any one of claims 1 to 3, characterized in that: The first insulating portion and the second insulating portion are formed and arranged respectively.

5. The battery cell according to claim 4, characterized in that: The melting point of the second insulating portion is greater than the melting point of the first insulating portion.

6. The battery cell according to any one of claims 1 to 3, characterized in that: The first insulating portion and the second insulating portion are integrally formed.

7. The battery cell according to claim 6, characterized in that: The protruding portion includes an end wall and a side wall, wherein the side wall is connected to the end wall and the connecting portion. The battery cell further includes an adhesive member, which is disposed between the connecting portion and the first insulating portion, and between the second insulating portion and the end wall, and the side wall and the adhesive member are spaced apart.

8. The battery cell according to claim 1, characterized in that: The battery cell further includes a pressure relief mechanism, which is disposed on the protruding portion, and at least a portion of the orthographic projection of the second insulating portion in the thickness direction thereof overlaps with the pressure relief mechanism.

9. The battery cell according to claim 8, characterized in that: The second insulating part includes a main body and a shielding part, the main body is connected to the first insulating part and the shielding part, at least part of the shielding part's orthographic projection in the thickness direction is located within the pressure relief mechanism, and the main body and the shielding part are connected via a weakening structure.

10. The battery cell according to claim 1, characterized in that: The electrode terminal includes a connection area, the connection area is used to connect to an electrical connector, a minimum distance S1 between the connection area and the first insulating portion, and a minimum distance S2 between the connection area and the second insulating portion satisfy S2<S1.

11. A battery device, characterized in that: The invention comprises an electrical connector and the battery cell according to any one of claims 1 to 10, wherein the electrical connector is connected to the electrode terminal.

12. An electrical device, characterized in that: A battery device comprising the battery device described in claim 11 above.

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