Shell assembly, battery cell, battery and electric device

Abstract

The utility model discloses a shell assembly, a battery monomer, a battery and an electric device, the shell assembly comprises: a shell, which is provided with a first through hole and a second through hole; the first pole is arranged corresponding to the first through hole; the first insulating part is connected with the first pole and the shell and is used for insulating the first pole and the shell; the second pole is arranged corresponding to the second through hole, and the resistivity of the second pole is smaller than that of the first pole; and the second insulating part is connected with the second pole and the shell and is used for insulating the second pole and the shell, and the softening point of the second insulating part is smaller than that of the first insulating part. The first insulating part has relatively high heat resistance, so that the probability that the first insulating part is softened when the first pole column generates heat can be reduced, the reliability of the first insulating part is improved, the probability that the first insulating part has insulation failure is reduced, the reliability of the battery monomer is effectively improved, and the use performance of the battery monomer is improved.

Description

Technical Field

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

[0002] In recent years, new energy vehicles have developed by leaps and bounds. In the field of electric vehicles, power batteries, as the power source of electric vehicles, play an irreplaceable and important role. The battery consists of a box and multiple battery cells contained in the box. Among them, batteries, as core components of new energy vehicles, have high requirements in terms of safety and service life. However, the battery cells in the battery will generate a lot of heat during the continuous charging and discharging process, which will cause the reliability of the battery cells to have insulation failure, affecting the reliability of the battery cells and the battery. Utility Model Content

[0003] The embodiments of the present application provide a housing assembly, a battery cell, a battery and an electrical device, which can effectively improve the reliability of the battery cell, the battery and the electrical device.

[0004] In a first aspect, an embodiment of the present application provides a shell assembly, comprising: an outer shell, the outer shell having a first through hole and a second through hole; a first pole, the first pole is arranged corresponding to the first through hole; a first insulating member, the first insulating member connects the first pole and the outer shell, and is used to insulate the first pole and the outer shell; a second pole, the second pole is arranged corresponding to the second through hole, the resistivity of the second pole is less than the resistivity of the first pole; a second insulating member, the second insulating member connects the second pole and the outer shell, and is used to insulate the second pole and the outer shell, and the softening point of the second insulating member is less than the softening point of the first insulating member.

[0005] In the above technical solution, since the resistivity of the second pole is lower than that of the first pole, when the electrode assembly inside the battery cell is cycled at high current and high temperature, the first pole generates more heat than the second pole. By setting the softening point of the second insulating member to be lower than the softening point of the first insulating member, the first insulating member has higher heat resistance, thereby reducing the probability of the first insulating member softening when the first pole generates heat, improving the stability and reliability of the first insulating member, and reducing the probability of insulation failure of the first insulating member, thereby effectively improving the reliability of the battery cell and improving the performance of the battery cell.

[0006] In some embodiments of the present application, the first insulating member is disposed on the outside of the housing and surrounds the circumference of the first pole.

[0007] In the above technical solution, the first insulating member can serve as the outer insulating structure of the shell assembly, and play an insulating and sealing role between the peripheral edge of the first pole and the outer side of the shell. In addition, since the first insulating member has high heat resistance, it can reduce the probability of insulation failure and sealing failure between the first pole and the outer side of the shell under high current circulation of the battery cell, effectively improve the insulation and sealing reliability between the first pole and the outer side of the shell, thereby further reducing the probability of short circuit between the first pole and the shell and the probability of leakage, and improving the reliability of the battery cell.

[0008] In some embodiments of the present application, the first insulating member is disposed between the first pole and the housing and is used to seal the first through hole.

[0009] In the above technical solution, the first insulating member can be a sealing member between the first pole and the shell, which is mainly responsible for forming a sealing interface between the first pole and the shell, reducing the probability of electrolyte leakage from the first through hole, which is conducive to improving the reliability of the battery cell. Since the first insulating member has high heat resistance, it can further improve the sealing reliability between the first pole and the outer side of the shell, effectively reduce the probability of leakage of the shell assembly, and is conducive to further improving the reliability of the battery cell.

[0010] In some embodiments of the present application, the shell assembly further includes: an insulating component, which is disposed on the inner side of the shell and partially passes through the first through hole and is connected to the first pole, and the portion of the insulating component passing through the first through hole forms a first insulating member.

[0011] In the above technical solution, the insulating component may refer to the insulating structure on the inner side of the battery cell. The first insulating member is formed by passing the insulating component through the part of the first through hole, thereby improving the insulation reliability between the first pole and the inner side of the outer shell, so that the insulation between the first pole and the inner side of the outer shell of the electrode assembly in the battery cell is more reliable when a large current circulates, reducing the probability of insulation failure, and improving the reliability of the battery cell.

[0012] In some embodiments of the present application, the material of the first insulating member includes at least one of liquid crystal polymer, polyaryletherketone, polyimide, and polyamide-imide.

[0013] In the above technical solution, by setting the material of the first insulating member to include at least one of liquid crystal polymer, polyaryletherketone, polyimide, and polyamide-imide, more options can be provided for the first insulating member, thereby improving the selectability of the first insulating member and helping to reduce the manufacturing difficulty of the first insulating member.

[0014] In some embodiments of the present application, the material of the first insulating member further includes a thermally conductive material.

[0015] In the above technical solution, by setting the material of the first insulating member to also include a heat-conductive material, it is helpful to conduct the heat of the first insulating member and the first pole to other components such as the outer shell and the electrode assembly, thereby improving the thermal conductivity of the first insulating member, which is helpful to reduce the temperature of the first insulating member and the first pole, thereby reducing the risk of softening of the first insulating member.

[0016] In some embodiments of the present application, the thermally conductive material includes at least one of beryllium oxide, aluminum nitride, boron nitride, magnesium oxide, aluminum oxide, and silicon carbide.

[0017] In the above technical solution, by setting the thermally conductive material to include at least one of beryllium oxide, aluminum nitride, boron nitride, magnesium oxide, aluminum oxide, and silicon carbide, more choices can be provided for the thermally conductive material added to the first insulating member, thereby improving the selectability of the first insulating member and helping to reduce the manufacturing difficulty of the first insulating member.

[0018] In some embodiments of the present application, the material of the first insulating member also includes heat-resistant fibers and fillers.

[0019] In the above technical solution, by setting the material of the first insulating member to also include heat-resistant fibers and fillers, the thermal stability of the first insulating member can be improved, thereby reducing the probability of softening of the first insulating member, which is beneficial to improving the reliability of the battery cell.

[0020] In some embodiments of the present application, the mass of the first pole is greater than the mass of the second pole; and / or the mass of the first insulating member is greater than the mass of the second insulating member.

[0021] In the above technical solution, when the electrode assembly inside the battery cell circulates at a high current, since the mass of the first pole is greater than the mass of the second pole, the heating rate of the first pole can be slowed down, and the final temperature of the first pole as a whole can be reduced, thereby reducing the probability of the first insulating member reaching the softening point, reducing the possibility of the first insulating member softening, and improving the reliability of the battery cell. If the mass of the first insulating member is greater than the mass of the second insulating member, when the heat of the first pole is transferred to the first insulating member, the final temperature of the first insulating member can be reduced, thereby reducing the probability of the first insulating member reaching the softening point, reducing the possibility of the first insulating member softening, and improving the reliability of the battery cell.

[0022] In some embodiments of the present application, the unit heat capacity of the first pole is greater than the unit heat capacity of the second pole; and / or the unit heat capacity of the first insulating member is greater than the unit heat capacity of the second insulating member.

[0023] In the above technical solution, the unit heat capacity of the first pole is greater than that of the second pole, so that the first pole has higher thermal stability and needs to absorb or release more heat to keep the temperature relatively stable. In other words, the first pole needs to absorb more heat to increase the temperature, so that the temperature rise of the first pole is slower, which can reduce the heat transferred to the first insulating member and reduce the risk of softening of the first insulating member. The unit heat capacity of the first insulating member is greater than that of the second insulating member, which also makes the first insulating member need to absorb more heat to increase the temperature, and the second insulating member is not easy to reach the softening point temperature, thereby reducing the probability of softening of the second insulating member, thereby improving the reliability of the battery cell.

[0024] In some embodiments of the present application, the material of the second insulating member includes at least one of polyphenylene sulfide, polypropylene, polybutylene terephthalate, and high-temperature nylon.

[0025] In the above technical solution, by setting the material of the second insulating part to include at least one of polyphenylene sulfide, polypropylene, polybutylene terephthalate, and high-temperature nylon, a variety of options can be provided for the manufacture of the second insulating part, thereby improving the selectability of the second insulating part and helping to reduce the difficulty of manufacturing the second insulating part.

[0026] In some embodiments of the present application, the housing includes a shell body and an end cover, the shell body has an opening, the end cover is arranged on the opening, and the first pole, the second pole, the first insulating member and the second insulating member are arranged on the end cover.

[0027] In the above technical solution, by arranging the first pole, the second pole, the first insulating member and the second insulating member on the end cover, the number of parts on the shell body can be reduced, and most of the non-parts are concentrated on the end cover, which is conducive to reducing the size of the shell assembly. In addition, since the end cover is lighter and smaller than the shell body, it is convenient to arrange and assemble the first pole, the second pole, the first insulating member and the second insulating member, which can reduce the complexity of assembly and improve the assembly efficiency of the battery cell.

[0028] In some embodiments of the present application, the housing includes a shell body and an end cover, the shell body has an opening, the end cover is arranged on the opening, and the first pole, the second pole, the first insulating member and the second insulating member are arranged on the shell body.

[0029] In the above technical solution, since the shell body has a greater thickness than the end cover, the first pole, the second pole, the first insulating member and the second insulating member are arranged on the shell body, which can improve the installation stability and reliability of the first pole and the second pole.

[0030] In some embodiments of the present application, the first pole is a positive pole, and the second pole is a negative pole.

[0031] In a second aspect, an embodiment of the present application further provides a battery cell, which includes the aforementioned shell assembly.

[0032] In the above technical solution, the probability of insulation failure of the pole in the shell assembly is relatively low, and it has good reliability and stability. The use of this shell assembly can further improve the reliability of the battery cell, improve the performance of the battery cell, and help to extend the service life of the battery cell.

[0033] In a third aspect, an embodiment of the present application further provides a battery, comprising the battery cell described above.

[0034] In the above technical solution, in the structure of the battery cell, the probability of insulation failure of the pole in the shell assembly is relatively low, it has good reliability and stability, good performance, and a longer service life. The use of this battery cell can improve the reliability of the battery.

[0035] In a fourth aspect, an embodiment of the present application also provides an electrical device, comprising the battery cell or battery as described above.

[0036] In the above technical solution, since the battery cell has higher insulation reliability, the reliability of the battery cell can be made stronger and the probability of damage is relatively low. Therefore, the electrical device using the battery cell or using a battery with the battery cell can improve the electrical reliability of the device itself. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0038] Figure 1 A schematic diagram of the structure of a vehicle provided in some embodiments of the present application;

[0039] Figure 2 An exploded view of the structure of a battery provided in some embodiments of the present application;

[0040] Figure 3 A schematic diagram of the structure of a housing assembly provided in some embodiments of the present application;

[0041] Figure 4 An exploded view of a portion of the structure of a housing assembly provided in some embodiments of the present application;

[0042] Figure 5 A three-dimensional schematic diagram of a partial structure of a housing assembly provided in some embodiments of the present application;

[0043] Figure 6 A top view of a partial structure of a housing assembly provided in some other embodiments of the present application;

[0044] Figure 7 for Figure 6 Sectional view along line AA;

[0045] Figure 8 A partial structural schematic diagram of a housing assembly provided in some embodiments of the present application;

[0046] Fig. 9 A partial structural schematic diagram of a housing assembly provided in another embodiment of the present application;

[0047] Fig.10 A partial structural schematic diagram of a housing assembly provided in yet another embodiment of the present application;

[0048] Fig.11 A schematic structural diagram of a housing assembly provided in another embodiment of the present application.

[0049] icon:

[0050] 1000. Vehicles;

[0051] 100, battery; 10, box; 11, first box body; 12, second box body; 20, battery cell; 2, shell assembly; 21, shell; 21a, first through hole; 21b, second through hole; 211, shell; 212, end cover; 22, first pole; 23, first insulating member; 24, second pole; 25, second insulating member; 26, insulating member; 27, third insulating member; 27a, first hole; 27b, second hole; 28, sealing member; 29, fourth insulating member;

[0052] 200, controller; 300, motor; X, first direction; Y, second direction; Z, third direction. DETAILED DESCRIPTION

[0053] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0054] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0055] Reference to "embodiment" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments.

[0056] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0057] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0058] In the embodiments of the present application, the same reference numerals represent 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 the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary descriptions and should not constitute any limitation to the present application.

[0059] The term "plurality" used in the present application refers to two or more (including two).

[0060] In the present application, battery cells may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries or magnesium-ion batteries, etc., and the embodiments of the present application do not limit this. Battery cells may be cylindrical, flat, rectangular or other shapes, etc., and the embodiments of the present application do not limit this. Battery cells are generally divided into three types according to the packaging method: cylindrical battery cells, square battery cells and soft-pack battery cells, and the embodiments of the present application do not limit this.

[0061] The battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity. For example, the battery mentioned in the present application may include a battery module or a battery pack. The battery generally includes a box for encapsulating one or more battery cells or multiple battery modules. The box can prevent liquid or other foreign matter from affecting the charging or discharging of the battery cells.

[0062] The battery cell includes a shell, an electrode assembly and an electrolyte, and the shell is used to contain the electrode assembly and the electrolyte. The electrode assembly is composed of a positive electrode sheet, a negative electrode sheet and a separator. The battery cell mainly relies on the movement of metal ions between the positive electrode sheet and the negative electrode sheet to work. The positive electrode sheet includes a positive electrode collector and a positive electrode active material layer. The positive electrode active material layer is coated on the surface of the positive electrode collector. The positive electrode collector not coated with the positive electrode active material layer protrudes from the positive electrode collector coated with the positive electrode active material layer. The positive electrode collector not coated with the positive electrode active material layer serves as a positive electrode ear. Taking lithium-ion batteries as an example, the material of the positive electrode collector can be aluminum, and the positive electrode active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganese oxide, etc. The negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer. The negative electrode active material layer is coated on the surface of the negative electrode current collector. The negative electrode current collector not coated with the negative electrode active material layer protrudes from the negative electrode current collector coated with the negative electrode active material layer. The negative electrode current collector not coated with the negative electrode active material layer serves as a negative electrode tab. The material of the negative electrode current collector can be copper, and the negative electrode active material can be carbon or silicon, etc. In order to ensure that a large current passes without melting, the number of positive electrode tabs is multiple and stacked together, and the number of negative electrode tabs is multiple and stacked together.

[0063] The material of the isolation film may be PP (polypropylene) or PE (polyethylene), etc. In addition, the electrode assembly may be a winding structure or a stacked structure, but the embodiments of the present application are not limited thereto.

[0064] In recent years, new energy vehicles have developed by leaps and bounds. In the field of electric vehicles, power batteries, as the power source of electric vehicles, play an irreplaceable and important role. The battery consists of a box and multiple battery cells contained in the box. Among them, batteries, as core components of new energy vehicles, have high requirements in terms of safety and cycle life.

[0065] In general battery cells, an insulating structure is set between the pole and the shell to insulate the pole and the shell, and the reliability of the insulating structure will affect the reliability of the battery cell. Specifically, since the materials of the positive pole and the negative pole are usually different (for example, the positive pole can be a pure aluminum pole), when the battery cell inside the battery cell circulates at high current and high temperature, the thermal conductivity of the positive pole is poorer than that of the negative pole, and the heat generated is more. Therefore, the local temperature rise of the positive pole is higher than that of the negative pole. Therefore, the insulating structure between the positive pole and the shell softens due to the high-temperature and high-rate cycling of the battery cell, resulting in poor stability of the insulating structure, affecting the insulation effect, and further affecting the reliability of the battery cell.

[0066] Based on the above considerations, in order to solve the problem that when the battery cells inside the battery cell are circulated at high current and high temperature, the positive electrode column and the negative electrode column are made of different materials, and the local temperature of the positive electrode column is higher, thereby affecting the reliability of the insulation structure between the positive electrode column and the shell, thereby affecting the reliability of the battery cell. The present application designs a shell assembly, including: a shell, the shell has a first through hole and a second through hole; a first pole, the first pole is arranged corresponding to the first through hole; a first insulating member, the first insulating member connects the first pole and the shell, and is used to insulate the first pole and the shell; a second pole, the second pole is arranged corresponding to the second through hole, and the resistivity of the second pole is less than the resistivity of the first pole; a second insulating member, the second insulating member connects the second pole and the shell, and is used to insulate the second pole and the shell, and the softening point of the second insulating member is less than the softening point of the first insulating member.

[0067] In a shell assembly of this structure, since the resistivity of the second pole is lower than that of the first pole, when the electrode assembly inside the battery cell is cycled at high current and high temperature, the first pole generates more heat than the second pole. By setting the softening point of the second insulating member to be lower than the softening point of the first insulating member, the first insulating member has higher heat resistance, thereby reducing the probability of the first insulating member softening when the first pole generates heat, improving the stability and reliability of the first insulating member, and reducing the probability of insulation failure of the first insulating member, thereby effectively improving the reliability of the battery cell and enhancing the performance of the battery cell.

[0068] The battery cells and batteries disclosed in the embodiments of the present application can be used in, but are not limited to, electrical devices such as vehicles, ships or aircraft. A power supply system having the battery cells and batteries disclosed in the present application can be used to form the electrical device, which is conducive to improving the application range of the battery cells and batteries.

[0069] The embodiment of the present application provides an electric device using a battery as a power source, and the electric device may be, but is not limited to, a mobile phone, a tablet, a laptop, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, etc. Among them, the electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc., and the spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0070] For the convenience of description, the following embodiments are described by taking a vehicle 1000 as an example of an electrical device according to an embodiment of the present application.

[0071] Please refer to Figure 1 , Figure 1 A schematic diagram of the structure of a vehicle 1000 provided for some embodiments of the present application. The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 100 is provided inside the vehicle 1000, and the battery 100 may be provided at the bottom, head or tail of the vehicle 1000. The battery 100 may be used to power the vehicle 1000, for example, the battery 100 may be used as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300, and the controller 200 is used to control the battery 100 to power the motor 300, for example, for starting, navigating and driving the vehicle 1000.

[0072] In some embodiments of the present application, the battery 100 can not only serve as an operating power source for the vehicle 1000, but also serve as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0073] Please refer to Figure 2 , Figure 2The structural exploded diagram of the battery 100 provided for some embodiments of the present application. The battery 100 includes a box body 10 and a plurality of battery cells 20, and the battery cells 20 are used to be accommodated in the box body 10. Among them, the box body 10 is used to provide an assembly space for the battery cells 20, and the box body 10 can adopt a variety of structures. In some embodiments, the box body 10 may include a first box body 11 and a second box body 12, and the first box body 11 and the second box body 12 cover each other, and the first box body 11 and the second box body 12 jointly define an assembly space for accommodating the battery cells 20. The second box body 12 can be a hollow structure with one end open, and the first box body 11 can be a plate-like structure. The first box body 11 covers the open side of the second box body 12, so that the first box body 11 and the second box body 12 jointly define the assembly space; the first box body 11 and the second box body 12 can also be hollow structures with one side open, and the open side of the first box body 11 covers the open side of the second box body 12. Of course, the box body 10 formed by the first box body 11 and the second box body 12 can be in various shapes, such as a cylinder, a cuboid, etc.

[0074] In the battery 100, multiple battery cells 20 can be connected in series, in parallel, or in a hybrid connection. A hybrid connection means that multiple battery cells 20 are connected in series and in parallel. Multiple battery cells 20 can be directly connected in series, in parallel, or in a hybrid connection, and then the whole formed by multiple battery cells 20 is accommodated in the box 10; of course, the battery 100 can also be a battery module formed by connecting multiple battery cells 20 in series, in parallel, or in a hybrid connection, and then multiple battery modules are connected in series, in parallel, or in a hybrid connection to form a whole, and accommodated in the box 10. The battery 100 may also include other structures, for example, the battery 100 may also include a busbar component for realizing electrical connection between multiple battery cells 20.

[0075] Please refer to Figure 2 , Figure 2 A partial structural diagram of a battery 100 provided in some embodiments of the present application. The battery 100 includes multiple rows of battery cells 20, which are arranged along the length direction of the box 10, and each row of battery cells 20 includes multiple battery cells 20 along the width direction of the box 10; or, multiple rows of battery cells 20 are arranged along the width direction of the box 10, and each row of battery cells 20 includes multiple battery cells 20 along the length direction of the box 10.

[0076] Each battery cell 20 may be a secondary battery or a primary battery; it may also be a lithium-sulfur battery, a sodium-ion battery or a magnesium-ion battery, but is not limited thereto. The battery cell 20 may be cylindrical, flat, rectangular or in other shapes. Figure 2 In the figure, the battery cell 20 is in the shape of a rectangular parallelepiped.

[0077] According to some embodiments of the present application, referring to Figure 3 and Figure 4 The embodiment of the present application provides a shell assembly 2, including: a shell 21, a first pole 22, a first insulating member 23, a second pole 24 and a second insulating member 25, the shell 21 has a first through hole 21a and a second through hole 21b; the first pole 22 is arranged corresponding to the first through hole 21a; the first insulating member 23 connects the first pole 22 and the shell 21, and is used to insulate the first pole 22 and the shell 21; the second pole 24 is arranged corresponding to the second through hole 21b, and the resistivity of the second pole 24 is less than the resistivity of the first pole 22; the second insulating member 25 connects the second pole 24 and the shell 21, and is used to insulate the second pole 24 and the shell 21, and the softening point of the second insulating member 25 is less than the softening point of the first insulating member 23.

[0078] The housing 21 may refer to a protective outer package including the electrode assembly and the electrolyte. The housing 21 is generally made of a metal material, including but not limited to steel and aluminum, etc. The shape of the housing 21 may include but not limited to a circle, a square, etc.

[0079] The first through hole 21a may refer to a through hole that passes through the inner side and the outer side of the housing 21. The first pole 22 is disposed corresponding to the first through hole 21a, so that the first pole 22 can be electrically connected to the tab in the housing 21.

[0080] The second through hole 21 b may refer to a through hole that passes through the inner side and the outer side of the housing 21 . The second pole 24 is disposed corresponding to the second through hole 21 b, so that the second pole 24 can be electrically connected to another pole tab in the housing 21 .

[0081] The first pole 22 and the second pole 24 may refer to the positive pole and the negative pole of the battery cell 20. Specifically, the first pole 22 may be one of the positive pole and the negative pole, and the second pole 24 may refer to the other of the positive pole and the negative pole. The positive pole usually refers to the place where the chemical reaction inside the battery cell 20 generates electrons to flow out, and the negative pole is the place where the electrons flow into the battery cell 20. Among them, the material of the positive pole may include but is not limited to lithium copper alloy, nickel chromium alloy, copper and aluminum, etc., and the material of the negative pole may include but is not limited to graphite and lithium titanate, etc. And the shapes of the first pole 22 and the second pole 24 may include but are not limited to cylindrical and quadrangular prism, etc.

[0082] The first insulating member 23 may refer to a material or structure used to isolate and protect the first pole 22 and the housing 21 and to play an insulating role. The second insulating member 25 may refer to a material or structure used to isolate and protect the second pole 24 and the housing 21. Since the first pole 22, the second pole 24 and the housing 21 are usually made of conductive metal, in order to prevent a direct short circuit or current leakage between them, an insulating member is required to isolate them. The first insulating member 23 and the second insulating member 25 are usually made of materials with good insulation properties, including but not limited to plastics, rubber or ceramics, etc.

[0083] The “softening point” mentioned above may refer to the temperature at which the first insulating member 23 or the second insulating member 25 begins to gradually soften, bend or deform during the heating process.

[0084] When the electrode assembly in the battery cell 20 is cycled at a high current (such as 3C-10C or 500A-1000A) and high temperature, since the resistivity of the second pole 24 is less than that of the first pole 22, the heat generated by the second pole 24 is small, and the heat generated by the first pole 22 is large. The temperature at the location of the second insulating member 25 is relatively low compared to the location of the first insulating member 23, and the probability of softening of the second insulating member 25 is relatively small, the reliability is relatively high, and the probability of insulation failure of the second insulating member 25 is relatively low. For the first pole 22 with a large heat generation, by setting the softening point of the second insulating member 25 to be lower than the softening point of the first insulating member 23, the first insulating member 23 has a higher softening point, that is, the first insulating member 23 has a higher heat resistance and can withstand a higher temperature, so that when the first pole 22 generates a large amount of heat, the probability of softening of the first insulating member 23 can be reduced, thereby improving the reliability of the first insulating member 23, which is conducive to reducing the probability of insulation failure of the first insulating member 23.

[0085] In the above technical solution, since the resistivity of the second pole 24 is lower than that of the first pole 22, when the electrode assembly inside the battery cell 20 is cycled at high current and high temperature, the first pole 22 generates more heat than the second pole 24. By setting the softening point of the second insulating member 25 to be lower than the softening point of the first insulating member 23, the first insulating member 23 has higher heat resistance, thereby reducing the probability of the first insulating member 23 softening when the first pole 22 generates heat, improving the stability and reliability of the first insulating member 23, and reducing the probability of insulation failure of the first insulating member 23, thereby effectively improving the reliability of the battery cell 20 and improving the performance of the battery cell 20.

[0086] In some embodiments of the present application, reference Figures 3 to 8 The first insulating member 23 is disposed on the outer side of the housing 21 and surrounds the circumference of the first pole 22 .

[0087] The peripheral side of the first pole 22 may refer to the peripheral edge around the first pole 22. Figure 4 The circumferential side of the first pole 22 may refer to the circumferential side of the first pole 22 around the third direction Z.

[0088] It can be understood that, since the first insulating member 23 is arranged on the outside of the shell 21 and surrounds the circumference of the first pole 22, the first insulating member 23 can serve as the outer insulating structure of the shell assembly 2 (which can be the upper plastic commonly referred to), so that the circumferential edge of the first pole 22 and the outside of the shell 21 are insulated, thereby reducing the probability of a short circuit between the first pole 22 and the outside of the shell 21.

[0089] Since the first insulating member 23 is arranged around the first pole 22, the first insulating member 23 can cover part of the outer peripheral surface of the first pole 22, which can provide protection and fixation for the first pole 22, reduce the impact of mechanical impact and extrusion on the first pole 22, and increase the strength and stability of the first pole 22. On the other hand, it can reduce the exposed surface of the first pole 22, thereby reducing the humid air, dust and other impurities between the first pole 22 and the external environment, and reduce the probability of the first pole 22 reacting with the substances in the external environment, which is beneficial to improve the electrochemical stability of the battery cell 20. In addition, the first insulating member 23 can also play a certain sealing role on the side of the first pole 22, reduce the probability of the substances in the external environment entering the shell 21 along the first through hole 21a, and reduce the probability of the electrolyte in the shell 21 flowing out of the first through hole 21a, which is beneficial to improve the electrochemical stability inside the battery cell 20.

[0090] Optionally, in the above embodiment, reference Figure 4 The housing assembly 2 may further include a third insulating member 27 and a sealing member 28. The third insulating member 27 may be disposed on the inner side of the housing 21, and a sealing member 28 is disposed between the first pole 22 and the first through hole 21a, and between the second pole 24 and the second through hole 21b.

[0091] The third insulating member 27 may refer to a material or structure used to isolate and protect the housing 21 from the internal electrode assembly and other components and to play an insulating role. It can be understood that the third insulating member 27 may be the lower plastic structure of the housing assembly 2, the first insulating member 23 may be the upper plastic structure of the housing assembly 2, and the sealing member 28 is a sealing ring. The first insulating member 23 and the second insulating member 25 in the housing assembly 2 thus constituted are not prone to softening, which can effectively reduce the probability of insulation failure, so that the housing assembly 2 has a higher reliability.

[0092] The third insulating member 27 may be provided with a hollow structure, so that the first pole 22 and the second pole 24 can pass through the hollow structure and be electrically connected to the pole tab of the electrode assembly. Figure 4 The third insulating member 27 may also be provided with a first hole 27a and a second hole 27b. The first hole 27a and the first through hole 21a are provided correspondingly, and the second hole 27b and the second through hole 21b are provided correspondingly. Thus, the first pole 22 can be electrically connected to the pole ear of the electrode assembly through the first hole 27a, and the second pole 24 can be electrically connected to the pole ear of the electrode assembly through the second hole 27b.

[0093] In the above technical solution, the first insulating member 23 can serve as the outer insulating structure of the housing assembly 2, and play an insulating and sealing role between the peripheral edge of the first pole 22 and the outer side of the shell 21. In addition, since the first insulating member 23 has high heat resistance, the probability of insulation failure and sealing failure between the first pole 22 and the outer side of the shell 21 of the battery cell 20 under large current circulation can be reduced, and the insulation and sealing reliability between the first pole 22 and the outer side of the shell 21 can be effectively improved, thereby further reducing the probability of short circuit and leakage between the first pole 22 and the shell 21, and improving the reliability of the battery cell 20.

[0094] In some embodiments of the present application, reference Fig. 9 The first insulating member 23 is disposed between the first pole 22 and the housing 21 and is used to seal the first through hole 21 a.

[0095] It can be understood that the first insulating member 23 may refer to a sealing component (eg, a sealing ring or a sealing gasket) between the first pole 22 and the housing 21 , and the shape of the first insulating member 23 may include but is not limited to a circular ring and a square ring.

[0096] In this embodiment, optionally, reference Fig. 9 The housing assembly 2 may further include a third insulating member 27 and a fourth insulating member 29 . The third insulating member 27 may be disposed on the inner side of the housing 21 , and the fourth insulating member 29 may be disposed on the outer side of the housing 21 and seal the first pole 22 and the outer side of the housing 21 .

[0097] The fourth insulating member 29 may refer to a material or structure used to isolate and protect the first pole 22 and the housing 21 and to perform an insulating function. It can be understood that the first insulating member 23 is a sealing ring used to seal the first through hole 21a in the housing assembly 2, the third insulating member 27 is a lower plastic structure, and the fourth insulating member 29 is an upper plastic structure.

[0098] In the above technical solution, the first insulating member 23 can be a sealing component between the first pole 22 and the shell 21, and is mainly responsible for forming a sealing interface between the first pole 22 and the shell 21, reducing the probability of electrolyte leakage from the first through hole 21a, which is beneficial to improving the reliability of the battery cell 20. Since the first insulating member 23 has high heat resistance, it can further improve the sealing reliability between the first pole 22 and the outer side of the shell 21, effectively reduce the probability of leakage of the shell assembly 2, and is beneficial to further improve the reliability of the battery cell 20.

[0099] In some embodiments of the present application, reference Fig.10 The shell assembly 2 also includes: an insulating component 26, which is arranged on the inner side of the shell 21, and partially penetrates the first through hole 21a and is connected to the first pole 22, and the portion of the insulating component 26 that penetrates the first through hole 21a forms a first insulating member 23.

[0100] In the above embodiment, optionally, reference Fig.10 The housing assembly 2 may further include a fourth insulating member 29 and a sealing member 28 . The fourth insulating member 29 is disposed on the outside of the housing 21 and insulates the first pole 22 from the housing 21 . The sealing member 28 is disposed between the first pole 22 and the housing 21 .

[0101] The sealing member 28 may refer to a member that performs a sealing function, and may include but is not limited to a sealing ring and a sealing pad, etc. It can be understood that the insulating member 26 is a lower plastic structure of the housing assembly 2, wherein a portion of the insulating member 26 can form the first insulating member 23, and the fourth insulating member 29 is an upper plastic structure, and the sealing member 28 is a sealing ring for sealing the first through hole 21a.

[0102] In the above technical solution, the insulating component 26 may refer to the insulating structure on the inner side of the battery cell 20 (usually understood as the lower plastic). The first insulating member 23 is formed by passing the insulating component 26 through the part of the first through hole 21a, thereby improving the insulation reliability between the first pole 22 and the inner side of the outer shell 21, so that the insulation between the first pole 22 and the inner side of the outer shell 21 of the electrode assembly in the battery cell 20 is more reliable when a large current circulates, reducing the probability of insulation failure, and improving the reliability of the battery cell 20.

[0103] In some embodiments of the present application, the material of the first insulating member 23 includes at least one of liquid crystal polymer, polyaryletherketone, polyimide, and polyamide-imide.

[0104] It can be understood that the first insulating member 23 can be made of engineering plastic material, specifically, at least one of liquid crystal polymer, polyaryletherketone, polyimide, and polyamide-imide.

[0105] In the above technical solution, by setting the material of the first insulating member 23 to include at least one of liquid crystal polymer, polyaryletherketone, polyimide, and polyamide-imide, more options can be provided for the first insulating member 23, thereby improving the selectability of the first insulating member 23 and helping to reduce the manufacturing difficulty of the first insulating member 23.

[0106] In some embodiments of the present application, the material of the first insulating member 23 also includes a thermally conductive material.

[0107] Thermally conductive material may refer to a material with good thermal conductivity that can effectively conduct heat.

[0108] In the above technical solution, by setting the material of the first insulating member 23 to also include a heat-conducting material, it is helpful to conduct the heat of the first insulating member 23 and the first pole 22 to other components such as the outer shell 21 and the electrode assembly, thereby improving the thermal conductivity of the first insulating member 23, which is helpful to reduce the temperature of the first insulating member 23 and the first pole 22, thereby reducing the risk of softening of the first insulating member 23.

[0109] In some embodiments of the present application, the thermally conductive material includes at least one of beryllium oxide, aluminum nitride, boron nitride, magnesium oxide, aluminum oxide, and silicon carbide.

[0110] It can be understood that the thermally conductive material can be a thermally conductive ceramic material, specifically at least one of beryllium oxide, aluminum nitride, boron nitride, magnesium oxide, aluminum oxide, and silicon carbide.

[0111] In the above technical solution, by setting the thermal conductive material to include at least one of beryllium oxide, aluminum nitride, boron nitride, magnesium oxide, aluminum oxide, and silicon carbide, more choices can be provided for the thermal conductive material added to the first insulating member 23, thereby improving the selectability of the first insulating member 23 and helping to reduce the manufacturing difficulty of the first insulating member 23.

[0112] In some embodiments of the present application, the material of the first insulating member 23 also includes heat-resistant fibers and fillers.

[0113] Heat-resistant fiber can refer to a fiber material that can maintain stability and withstand high temperature conditions in a high temperature environment. Heat-resistant fiber can include but is not limited to asbestos fiber, glass fiber, carbon fiber, whisker, and the like.

[0114] The filler may refer to a material filled in the first insulating member 23 , and may specifically include but is not limited to calcium carbonate, talc, wollastonite, mica, calcined clay, bauxite, asbestos, and the like.

[0115] In the above technical solution, by setting the material of the first insulating member 23 to also include heat-resistant fibers and fillers, the thermal stability of the first insulating member 23 can be improved, thereby reducing the probability of softening of the first insulating member 23, which is beneficial to improving the reliability of the battery cell 20.

[0116] In some embodiments of the present application, the mass of the first pole 22 is greater than the mass of the second pole 24 ; and / or the mass of the first insulating member 23 is greater than the mass of the second insulating member 25 .

[0117] It can be understood that the mass of the first pole 22 can be greater than the mass of the second pole 24; or, the mass of the first insulating member 23 is greater than the mass of the second insulating member 25; or, the mass of the first pole 22 can be greater than the mass of the second pole 24, and the mass of the first insulating member 23 is greater than the mass of the second insulating member 25.

[0118] In the above technical solution, when the electrode assembly inside the battery cell 20 circulates at a high current, since the mass of the first pole 22 is greater than the mass of the second pole 24, the temperature rise rate of the first pole 22 can be slowed down, and the final temperature of the first pole 22 as a whole can be reduced, thereby reducing the probability of the first insulating member 23 reaching the softening point, reducing the possibility of the first insulating member 23 softening, and improving the reliability of the battery cell 20. If the mass of the first insulating member 23 is greater than the mass of the second insulating member 25, when the heat of the first pole 22 is transferred to the first insulating member 23, the final temperature of the first insulating member 23 can be reduced, thereby reducing the probability of the first insulating member 23 reaching the softening point, reducing the possibility of the first insulating member 23 softening, and improving the reliability of the battery cell 20.

[0119] In some embodiments of the present application, the unit heat capacity of the first pole 22 is greater than the unit heat capacity of the second pole 24 ; and / or the unit heat capacity of the first insulating member 23 is greater than the unit heat capacity of the second insulating member 25 .

[0120] Unit heat capacity refers to the energy required for a substance to absorb or release heat. It can represent the amount of heat absorbed or released by a substance per unit mass or unit volume when the temperature changes.

[0121] It can be understood that, in the above scheme, the unit heat capacity of the first pole 22 can be greater than the unit heat capacity of the second pole 24; or, the unit heat capacity of the first insulating member 23 is greater than the unit heat capacity of the second insulating member 25; or, the unit heat capacity of the first pole 22 can be greater than the unit heat capacity of the second pole 24, and the unit heat capacity of the first insulating member 23 is greater than the unit heat capacity of the second insulating member 25.

[0122] In the above technical solution, the unit heat capacity of the first pole 22 is greater than the unit heat capacity of the second pole 24, so that the first pole 22 has a higher thermal stability and needs to absorb or release more heat to keep the temperature relatively stable, that is, the first pole 22 needs to absorb more heat to increase the temperature, so that the temperature rise of the first pole 22 is slower, which can reduce the heat transferred to the first insulating member 23 and reduce the risk of softening of the first insulating member 23. The unit heat capacity of the first insulating member 23 is greater than the unit heat capacity of the second insulating member 25, which also makes the first insulating member 23 need to absorb more heat to increase the temperature, which makes it difficult for the second insulating member 25 to reach the softening point temperature, thereby reducing the probability of softening of the second insulating member 25, thereby improving the reliability of the battery cell 20.

[0123] In some embodiments of the present application, the material of the second insulating member 25 includes at least one of polyphenylene sulfide, polypropylene, polybutylene terephthalate, and high-temperature nylon.

[0124] In the above technical solution, by setting the material of the second insulating member 25 to include at least one of polyphenylene sulfide, polypropylene, polybutylene terephthalate, and high-temperature nylon, a variety of options can be provided for the manufacture of the second insulating member 25, thereby improving the selectability of the second insulating member 25 and helping to reduce the difficulty of manufacturing the second insulating member 25.

[0125] In some embodiments of the present application, reference is made to Fig.11 The housing 21 includes a shell body 211 and an end cover 212 . The shell body 211 has an opening. The end cover 212 is disposed on the opening. The first pole 22 , the second pole 24 , the first insulating member 23 and the second insulating member 25 are disposed on the end cover 212 .

[0126] The shell body 211 may refer to the main structure of the outer shell 21 , and generally refers to a hollow container with an open opening.

[0127] The end cap 212 may refer to a component connected to the shell body 211 and closing the opening. The end cap 212 is generally a flat or convex structure having a shape and size corresponding to the shell body 211. The materials of the end cap 212 and the shell body 211 may include but are not limited to steel and aluminum.

[0128] In the above technical solution, by arranging the first pole 22, the second pole 24, the first insulating member 23 and the second insulating member 25 on the end cover 212, the number of parts on the shell body 211 can be reduced, and most of the non-parts are concentrated on the end cover 212, which is conducive to reducing the size of the shell assembly 2. Moreover, since the end cover 212 is lighter and smaller in size than the shell body 211, it is convenient to arrange and assemble the first pole 22, the second pole 24, the first insulating member 23 and the second insulating member 25, which can reduce the complexity of assembly and improve the assembly efficiency of the battery cell 20.

[0129] In some embodiments of the present application, reference Fig.11 The housing 21 includes a shell body 211 and an end cover 212 . The shell body 211 has an opening, and the end cover 212 is disposed on the opening. The first pole 22 , the second pole 24 , the first insulating member 23 and the second insulating member 25 are disposed on the shell body 211 .

[0130] It should be noted that the first pole 22 and the second pole 24 can be arranged on the same shell wall or different shell walls of the shell body 211. The shell body 211 can have a first direction X, a second direction Y and a third direction Z, and the first direction X, the second direction Y and the third direction Z can represent different directions of the shell body 211. Exemplarily, the first direction X can be the length direction of the shell body 211, the second direction Y can be the width direction of the shell body 211, and the third direction Z can be the height direction of the shell body 211, so that the first pole 22 and the second pole 24 can be arranged on one or more of the shell walls of the shell body 211 at both ends of the first direction X, the shell walls at both ends of the second direction Y, and the shell wall at one end of the third direction Z.

[0131] In the above technical solution, since the shell body 211 has a greater thickness than the end cover 212, the first pole 22, the second pole 24, the first insulating member 23 and the second insulating member 25 are arranged on the shell body 211, which can improve the installation stability and reliability of the first pole 22 and the second pole 24.

[0132] In some embodiments of the present application, the first pole 22 is a positive pole, and the second pole 24 is a negative pole.

[0133] In the above technical solution, by setting the first pole 22 as a positive pole and the second pole 24 as a negative pole,

[0134] In the above technical solution, by setting the first pole 22 as the positive pole and the second pole 24 as the negative pole, the first insulating member 23 can insulate the positive pole and the outer shell 21, so that the insulating member at the position of the positive pole has higher heat resistance, so that the positive pole can select a material with poor thermal conductivity and high heat generation but relatively outstanding other properties (such as a pure aluminum positive pole), thereby providing more options for the design of the battery cell 20, which is beneficial to take into account performance and cost considerations, thereby improving the performance of the battery cell 20.

[0135] According to the shell assembly 2 provided in the embodiment of the present application, the shell assembly 2 includes: a shell 21, a positive pole, a negative pole, a first upper plastic, and a second upper plastic. The positive pole is a pure aluminum pole, and the resistivity is higher than the resistivity of the negative pole. The first upper plastic is arranged between the positive pole and the shell 21, and the second upper plastic is arranged between the negative pole and the shell 21. Among them, the first upper plastic is an engineering plastic, and the softening point of the first upper plastic is greater than the softening point of the second upper plastic.

[0136] In a second aspect, an embodiment of the present application further provides a battery cell 20 , which includes the aforementioned housing assembly 2 .

[0137] In the above technical solution, the probability of insulation failure of the pole in the shell assembly 2 is relatively low, and it has good reliability and stability. The use of the shell assembly 2 can further improve the reliability of the battery cell 20, improve the performance of the battery cell 20, and help to extend the service life of the battery cell 20.

[0138] In a third aspect, the embodiment of the present application further provides a battery 100 , comprising the battery cell 20 described above.

[0139] In the above technical solution, in the structure of the battery cell 20, the probability of insulation failure of the pole in the shell assembly 2 is relatively low, it has good reliability and stability, good performance, and a longer service life. The use of the battery cell 20 can improve the reliability of the battery 100.

[0140] In a fourth aspect, an embodiment of the present application further provides an electrical device, comprising the battery cell 20 or the battery 100 as described above.

[0141] In the above technical solution, since the battery cell 20 has higher insulation reliability, the reliability of the battery cell 20 can be made stronger and the probability of damage is relatively low. Therefore, the electrical device using the battery cell 20 or the battery 100 having the battery cell 20 can improve the electrical reliability of the device itself.

[0142] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0143] The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A housing assembly, characterized in that: include: A housing having a first through hole and a second through hole; A first pole, wherein the first pole is arranged corresponding to the first through hole; A first insulating member, the first insulating member connecting the first pole and the housing and used to insulate the first pole from the housing; a second pole, the second pole is arranged corresponding to the second through hole, and the resistivity of the second pole is less than the resistivity of the first pole; A second insulating member connects the second pole and the shell and is used to insulate the second pole and the shell, and a softening point of the second insulating member is lower than a softening point of the first insulating member.

2. The housing assembly according to claim 1, characterized in that: The first insulating member is arranged on the outer side of the housing and surrounds the circumference of the first pole.

3. The housing assembly according to claim 1 or 2, characterized in that: The first insulating member is disposed between the first pole and the housing and is used to seal the first through hole.

4. The housing assembly according to claim 1, characterized in that: The housing assembly further includes an insulating component, which is disposed on the inner side of the housing and partially penetrates the first through hole and is connected to the first pole. The portion of the insulating component that penetrates the first through hole forms the first insulating member.

5. The housing assembly according to claim 1, characterized in that: The material of the first insulating member is one of liquid crystal polymer, polyaryletherketone, polyimide and polyamide-imide.

6. The housing assembly according to claim 5, characterized in that: The material of the first insulating member also includes a heat-conducting material.

7. The housing assembly according to claim 6, characterized in that: The thermal conductive material is one of beryllium oxide, aluminum nitride, boron nitride, magnesium oxide, aluminum oxide, and silicon carbide.

8. The housing assembly according to any one of claims 5 to 7, characterized in that: The material of the first insulating member also includes heat-resistant fiber and filler.

9. The housing assembly according to claim 1, characterized in that: The mass of the first pole is greater than the mass of the second pole; and / or the mass of the first insulating member is greater than the mass of the second insulating member.

10. The housing assembly according to claim 1, characterized in that The unit heat capacity of the first pole is greater than the unit heat capacity of the second pole; and / or the unit heat capacity of the first insulating member is greater than the unit heat capacity of the second insulating member.

11. The housing assembly according to claim 1, characterized in that: The material of the second insulating member is one of polyphenylene sulfide, polypropylene, polybutylene terephthalate, and high-temperature nylon.

12. The housing assembly according to claim 1, wherein: The shell includes a shell body and an end cover, the shell body has an opening, the end cover is arranged on the opening, and the first pole, the second pole, the first insulating member and the second insulating member are arranged on the end cover.

13. The housing assembly according to claim 1, characterized in that The shell comprises a shell body and an end cover, the shell body has an opening, the end cover is arranged on the opening, and the first pole, the second pole, the first insulating member and the second insulating member are arranged on the shell body.

14. The housing assembly according to claim 1, wherein: The first pole is a positive pole, and the second pole is a negative pole.

15. A battery cell, characterized in that: Comprising the housing assembly according to any one of claims 1 to 14.

16. A battery, characterized in that: Comprising the battery cell as claimed in claim 15.

17. An electrical device, characterized in that: Comprising the battery cell as claimed in claim 15, or the battery as claimed in claim 16.

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