Battery monomer, battery and electric device

Abstract

The utility model discloses a battery monomer, a battery and a power utilization device. The single battery comprises a shell, an electrode assembly, a detection assembly and a protection structure, the shell is provided with a containing cavity, the electrode assembly is contained in the containing cavity, the detection assembly is connected to the shell and used for detecting the working state of the single battery, and the protection structure covers at least part of the surface of the detection assembly. According to the embodiment of the invention, the safety and reliability of the battery monomer can be effectively improved.

Description

Technical Field

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

[0002] Battery cells are widely used in electronic devices, such as mobile phones, laptop computers, electric vehicles, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes, and electric tools, etc. Battery cells can include nickel-cadmium battery cells, nickel-hydrogen battery cells, lithium-ion battery cells, and secondary alkaline zinc-manganese battery cells, etc.

[0003] In the development of battery technology, how to improve the safety and reliability of battery cells is a research direction in battery technology. Summary of the invention

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

[0005] In a first aspect, an embodiment of the present application provides a battery cell, which includes a shell, an electrode assembly, a detection assembly and a protective structure, wherein the shell has a accommodating cavity, the electrode assembly is accommodated in the accommodating cavity, the detection assembly is connected to the shell and is used to detect the working status of the battery cell, and the protective structure covers at least a portion of the surface of the detection assembly.

[0006] In the above technical solution, by arranging a detection component and a protective structure for protecting the detection component on the battery cell, the detection component can detect the working state of the battery cell in real time, and can quickly warn of abnormal parameters in the operation of the battery cell, so that the corresponding safety agencies or personnel can respond in time, thereby improving the safety and reliability of the battery cell. The protective structure covers at least part of the surface of the detection component, which can reduce the risk of the detection component being damaged during the production or use of the battery cell.

[0007] In some embodiments of the first aspect, the housing includes a first wall, and the detection assembly is connected to the first wall.

[0008] In some embodiments of the first aspect, the detection component is located on the side of the first wall away from the accommodating cavity, which can reduce the occupation of the detection component in the internal space of the battery cell, which is conducive to improving the energy density of the battery cell. Furthermore, the detection component is located on the side of the first wall away from the accommodating cavity, which also facilitates the assembly of the detection component.

[0009] In some embodiments of the first aspect, the housing includes an electrode terminal, which protrudes from a side surface of the first wall away from the accommodating cavity, the electrode terminal is electrically connected to the electrode ear of the electrode assembly, and the detection assembly is electrically connected to the electrode terminal.

[0010] In some embodiments of the first aspect, along the thickness direction of the first wall, a surface of the protection structure facing away from the first wall is not higher than a surface of the electrode terminal facing away from the first wall.

[0011] In the above technical solution, the protective structure covers the surface of the detection component without additionally increasing the thickness of the first wall, which is beneficial to reducing the overall volume of the battery cell. Further, it can reduce the risk of interference between the protective structure and other components in the battery.

[0012] In some embodiments of the first aspect, the detection component is located on the side of the first wall facing the accommodating cavity, which is beneficial to reducing the overall volume of the battery cell. Furthermore, the detection component is located on the side of the first wall facing the accommodating cavity and can also improve the flatness and integrity of the outer surface of the battery cell.

[0013] In some embodiments of the first aspect, the first wall is provided with a recess, which is formed by a side surface of the first wall facing away from the accommodating cavity and being recessed in a direction toward the accommodating cavity; or, the recess is formed by a side surface of the first wall facing the accommodating cavity and being recessed in a direction away from the accommodating cavity; and the detection component is at least partially accommodated in the recess.

[0014] In the above technical solution, by providing a recess on the first wall, the detection assembly is at least partially accommodated in the recess, which can improve the flatness of the surface of the first wall and reduce the risk of interference between the detection assembly and other components in the battery.

[0015] In some embodiments of the first aspect, the shape and size of the protection structure match the shape and size of the outer contour of the recess, which can improve the tightness of the fit between the protection structure and the recess and further enhance the protection effect of the protection structure.

[0016] In some embodiments of the first aspect, along the thickness direction of the first wall, the surface of the protection structure away from the first wall is not higher than the side surface of the first wall away from the accommodating cavity, which can further improve the flatness of the first wall surface.

[0017] In some embodiments of the first aspect, the protection structure includes a main body portion, and the main body portion covers at least a portion of the surface of the detection component.

[0018] In the above technical solution, the main body has a certain thickness and hardness, and thus has a strong ability to resist deformation, and can more effectively protect the detection component.

[0019] In some embodiments of the first aspect, the protection structure further includes a side portion, which is connected to the main body portion to form a receiving space, and the receiving space is used to receive the detection component.

[0020] In the above technical solution, by setting the protective structure as a cover-shaped structure with a accommodating space, the detection component can be accommodated in the accommodating space while covering and protecting the detection component, thereby reducing the risk of interference between the protective structure and the detection component and further improving the protective effect of the protective structure.

[0021] In some embodiments of the first aspect, the protective structure is a film layer structure, and the film layer structure is attached to at least a portion of the surface of the detection component.

[0022] In the above technical solution, the protective structure is set as a film layer structure, which has a relatively thin thickness and can be attached to the surface of the detection component, which can effectively reduce the structural complexity of the protective structure. Furthermore, the film layer structure can be attached to the surface of the detection component during the manufacturing process of the detection component to form a protective structure, which is conducive to simplifying the process flow.

[0023] In some embodiments of the first aspect, the protection structure is connected to the housing by snapping or bonding.

[0024] In the above technical solution, when the protective structure is connected to the outer shell of the battery cell by bonding, the protective effect of the protective structure can be further enhanced. When the protective structure is connected to the outer shell of the battery cell by snapping, it is conducive to improving the convenience of installing the protective structure.

[0025] In some embodiments of the first aspect, the battery cell further includes an insulating member for insulating the electrode terminal from the first wall; the detection assembly includes a sensing component and a wire connected to each other, and the sensing component is electrically connected to the electrode terminal through the wire.

[0026] In some embodiments of the first aspect, a connection portion is provided on a surface of the electrode terminal that is away from the first wall, and the wire is connected to the connection portion to electrically connect the sensor component to the electrode terminal.

[0027] In some embodiments of the first aspect, the insulating member has a protrusion protruding from a side surface of the electrode terminal away from the first wall, and the protrusion is used to separate the side surface of the electrode terminal away from the first wall from the connecting portion.

[0028] In the above technical solution, by providing a convex portion to separate the connecting portion from the central area of ​​the surface of the electrode terminal facing away from the first wall, the risk of the detection assembly being damaged during the formation process of the battery cell can be reduced.

[0029] In some embodiments of the first aspect, a through hole is provided on the insulating member, and the wire is connected to the electrode terminal through the through hole.

[0030] In the above technical solution, the wire passes through the through hole to connect with the electrode terminal located inside the insulating member, and the connecting portion between the wire and the electrode terminal is located inside the insulating member, reducing the risk of damage to the connecting portion between the wire and the electrode terminal due to exposure to the external environment.

[0031] In some embodiments of the first aspect, the housing includes a shell and an end cover, the shell has an opening, and the end cover is used to cover the opening; the end cover is a first wall of the housing.

[0032] In some embodiments of the first aspect, a reinforcement portion is provided on the protection structure, and the reinforcement portion is formed by protrusions on a surface of the protection structure on a side facing away from the detection component.

[0033] In the above technical solution, by arranging a reinforcement portion on the protective structure, the compressive strength of the protective structure can be enhanced, and the protective effect of the protective structure is further improved.

[0034] In some embodiments of the first aspect, the material of the protection structure is an insulating and heat-insulating material.

[0035] In the above technical solution, by using insulating and heat-insulating materials to make the protection structure, the influence of the heat generated by the battery cells during use on the protection structure can be reduced, thereby increasing the service life of the protection structure. At the same time, the risk of short circuit caused by contact interference between the protection structure and the detection component can be reduced, thereby affecting the normal use of the detection component.

[0036] In a second aspect, an embodiment of the present application provides a battery, comprising a battery cell provided in any embodiment of the second aspect.

[0037] In a third aspect, an embodiment of the present application provides an electrical device, comprising a battery cell provided by any embodiment of the second aspect, wherein the battery cell is used to provide electrical energy.

[0038] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Also, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0040] Figure 1 A schematic diagram of the structure of a vehicle provided in some embodiments of the present application;

[0041] Figure 2 An exploded schematic diagram of a battery provided in some embodiments of the present application;

[0042] Figure 3 for Figure 2 A schematic diagram of the structure of the battery module shown;

[0043] Figure 4 An exploded schematic diagram of a battery cell provided in some embodiments of the present application;

[0044] Figure 5 An exploded schematic diagram of a first wall of a battery cell provided in some embodiments of the present application;

[0045] Figure 6 A schematic diagram of a protective structure provided in some embodiments of the present application;

[0046] Figure 7 A schematic diagram of another protective structure provided for some embodiments of the present application;

[0047] Figure 8 An exploded schematic diagram of a first wall of another battery cell provided in some embodiments of the present application;

[0048] Fig. 9 A schematic diagram of a local structure of an electrode terminal of a battery cell provided in some embodiments of the present application;

[0049] Fig.10 A schematic diagram of a local structure of an electrode terminal of another battery cell provided in some embodiments of the present application;

[0050] Fig.11 A schematic diagram of a partial structure of an electrode terminal of another battery cell provided in some embodiments of the present application;

[0051] Fig.12 A schematic structural diagram of another protective structure provided for some embodiments of the present application.

[0052] The reference numerals in the specific implementation manner are as follows:

[0053] 1. Vehicle; 2. Battery; 3. Controller; 4. Motor; 5. Box; 5a. First box part; 5b. Second box part; 5c. Accommodation space; 6. Battery module; 7. Battery cell; 10. Electrode assembly; 20. Housing; 30. First wall; 31. Electrode terminal; 32. Recess; 33. Insulator; 331. Protrusion; 332. Through hole; 40. Detection assembly; 41. Sensor component; 42. Wire; 43. Connecting part; 50. Protective structure; 51. Main body; 52. Side; 53. Reinforcement. DETAILED DESCRIPTION

[0054] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0055] 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 and completely 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.

[0056] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as those commonly understood by technicians in the technical field to which this application belongs; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first", "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.

[0057] 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.

[0058] 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.

[0059] 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.

[0060] 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.

[0061] The term "plurality" used in the present application refers to two or more (including two).

[0062] In the present application, the term "parallel" includes not only the absolutely parallel situation, but also the roughly parallel situation conventionally recognized in engineering; meanwhile, "vertical" includes not only the absolutely vertical situation, but also the roughly vertical situation conventionally recognized in engineering.

[0063] At present, from the perspective of market development, the application of power batteries is becoming more and more extensive. Power batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as military equipment and aerospace and other fields. With the continuous expansion of the application field of power batteries, the market demand is also constantly expanding.

[0064] In the present application, the battery cell may include a lithium-ion secondary battery cell, a lithium-ion primary battery cell, a lithium-sulfur battery cell, a sodium-lithium-ion battery cell, a sodium-ion battery cell or a magnesium-ion battery cell, etc., and the embodiments of the present application do not limit this. The battery cell may be cylindrical, flat, rectangular or other shapes, etc., and the embodiments of the present application do not limit this.

[0065] 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. The box can prevent liquid or other foreign matter from affecting the charging or discharging of the battery cells.

[0066] The battery cell includes an electrode assembly and an 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 current collector not coated with the positive electrode active material layer protrudes from the current collector coated with the positive electrode active material layer. The current collector not coated with the positive electrode active material layer is stacked as a positive electrode tab. 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. The negative electrode sheet includes a negative electrode collector and a negative electrode active material layer. The negative electrode active material layer is coated on the surface of the negative electrode collector. The current collector not coated with the negative electrode active material layer protrudes from the current collector coated with the negative electrode active material layer. The current collector not coated with the negative electrode active material layer is stacked as a negative electrode tab. The material of the negative electrode collector can be copper, and the negative electrode active material can be carbon or silicon. The material of the separator may be PP or PE, 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.

[0067] The battery cell also includes a shell, which includes a shell, an end cap, an electrode terminal and an insulating member. The shell has an opening, and the end cap covers the opening and is sealed to form a sealed space for accommodating the electrode assembly and the electrolyte. The insulating member is sleeved on the electrode terminal to prevent a short circuit at the electrode terminal.

[0068] The inventor of the present application has noticed that currently available battery cells are not equipped with detection components, so it is impossible to detect the working status of the battery cells in real time. The working status of the battery cells includes but is not limited to voltage, temperature and other related data. At the same time, currently available battery cells are not equipped with a protection structure for protecting the detection components.

[0069] In order to solve the problem of being unable to detect the working status of battery cells in real time, the inventors of this application have found that the working status of battery cells can be detected in real time by setting up a detection component. The detection component can control the working status of the battery cell in real time, and can quickly warn of abnormal parameters in the operation of the battery cell, so that the corresponding safety agencies or personnel can respond in time, thereby improving the safety and reliability of the battery cell. At the same time, setting up a protective structure for protecting the detection component can reduce the risk of damage to the detection component during the use of the battery cell.

[0070] Based on the above considerations, the inventors have conducted in-depth research and designed a battery cell. By setting a detection component and a protective structure for protecting the detection component on the battery cell, the working status of the battery cell can be controlled in real time, while the risk of damage to the detection component during the use of the battery cell can be reduced.

[0071] The technical solutions described in the embodiments of the present application are applicable to battery cells, batteries, and electrical devices using batteries.

[0072] The electrical device may be a vehicle, a mobile phone, a portable device, a laptop computer, a ship, a spacecraft, an electric toy, an electric tool, and the like. The vehicle 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, and the like; the spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, and the like; 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, and the like; the electric tool may include a metal cutting electric tool, a grinding electric tool, an assembly electric tool, and an electric tool for railways, such as an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact drill, a concrete vibrator, and an electric planer, and the like. The embodiments of the present application do not impose any special restrictions on the above-mentioned electrical devices.

[0073] It should be understood that the technical solutions described in the embodiments of the present application are not limited to the batteries and electrical equipment described above, but can also be applied to all batteries including a box and electrical equipment using the battery. However, for the sake of simplicity, the following embodiments are described using electric vehicles as an example.

[0074] Figure 1 A schematic diagram of the structure of a vehicle provided for some embodiments of the present application.

[0075] like Figure 1 As shown, a battery 2 is disposed inside the vehicle 1, and the battery 2 may be disposed at the bottom, head, or tail of the vehicle 1. The battery 2 may be used to power the vehicle 1, for example, the battery 2 may be used as an operating power source for the vehicle 1.

[0076] The vehicle 1 may further include a controller 3 and a motor 4 , wherein the controller 3 is used to control the battery 2 to supply power to the motor 4 , for example, to meet the power requirements of starting, navigating, and driving the vehicle 1 .

[0077] In some embodiments of the present application, the battery 2 can not only serve as an operating power source for the vehicle 1, but also serve as a driving power source for the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.

[0078] Figure 2 An exploded schematic diagram of a battery provided for some embodiments of the present application.

[0079] like Figure 2 As shown, the battery 2 includes a box body 5 and a battery cell, and the battery cell is accommodated in the box body 5 .

[0080] The box 5 is used to accommodate the battery cells, and the box 5 can be of various structures. In some embodiments, the box 5 can include a first box portion 5a and a second box portion 5b, the first box portion 5a and the second box portion 5b cover each other, and the first box portion 5a and the second box portion 5b jointly define a storage space 5c for accommodating the battery cells. The second box portion 5b can be a hollow structure with one end open, the first box portion 5a is a plate-like structure, and the first box portion 5a covers the open side of the second box portion 5b to form a box 5 with a storage space 5c; the first box portion 5a and the second box portion 5b can also be hollow structures with one side open, and the open side of the first box portion 5a covers the open side of the second box portion 5b to form a box 5 with a storage space 5c. Of course, the first box portion 5a and the second box portion 5b can be of various shapes, such as a cylinder, a cuboid, etc.

[0081] In order to improve the sealing performance after the first box body part 5a and the second box body part 5b are connected, a sealing member, such as a sealant, a sealing ring, etc., may also be provided between the first box body part 5a and the second box body part 5b.

[0082] Assuming that the first box body portion 5a covers the top of the second box body portion 5b, the first box body portion 5a can also be called an upper box cover, and the second box body portion 5b can also be called a lower box.

[0083] In the battery 2, there can be one or more battery cells. If there are multiple battery cells, the multiple battery cells can be connected in series, in parallel, or in mixed connection. Mixed connection means that the multiple battery cells are both connected in series and in parallel. The multiple battery cells can be directly connected in series, in parallel, or in mixed connection, and then the whole formed by the multiple battery cells is accommodated in the box 5; of course, multiple battery cells can also be connected in series, in parallel, or in mixed connection to form a battery module 6, and the multiple battery modules 6 are then connected in series, in parallel, or in mixed connection to form a whole, and accommodated in the box 5.

[0084] Figure 3 for Figure 2 Schematic diagram of the structure of the battery module shown.

[0085] In some embodiments, Figure 3 As shown, there are multiple battery cells 7, and the multiple battery cells 7 are first connected in series, in parallel, or in mixed connection to form a battery module 6. The multiple battery modules 6 are then connected in series, in parallel, or in mixed connection to form a whole, and are accommodated in a box.

[0086] The multiple battery cells 7 in the battery module 6 can be electrically connected through a busbar component to achieve parallel connection, series connection or mixed connection of the multiple battery cells 7 in the battery module 6 .

[0087] Figure 4 An exploded schematic diagram of a battery cell provided in some embodiments of the present application.

[0088] like Figure 4 As shown, the battery cell 7 provided in the embodiment of the present application includes an electrode assembly 10 and a housing 20, wherein the electrode assembly 10 is accommodated in the housing 20. The housing 20 can also be used to accommodate an electrolyte, such as an electrolyte solution.

[0089] In some embodiments, the housing 20 includes a first wall 30, and the housing 20 may be in various shapes, such as a cylinder, a cuboid, etc. The shape of the housing 20 may be determined according to the specific shape of the electrode assembly 10. For example, if the electrode assembly 10 is a cylindrical structure, a cylindrical housing may be selected; if the electrode assembly 10 is a cuboid structure, a cuboid housing may be selected.

[0090] In the battery cell 7, the electrode assembly 10 accommodated in the housing 20 may be one, two or more. Figure 4 In the embodiment, there are two electrode assemblies 10.

[0091] Figure 5 A schematic exploded view of a first wall of a battery cell provided in some embodiments of the present application.

[0092] Continue to refer Figure 5 The embodiment of the present application provides a battery cell 7, which includes a housing 20, an electrode assembly 10, a detection assembly 40 and a protective structure 50. The housing 20 has a receiving cavity. The electrode assembly 10 is received in the receiving cavity, the detection assembly 40 is connected to the housing 20 and is used to detect the working state of the battery cell 7, and the protective structure 50 covers at least part of the surface of the detection assembly 40.

[0093] Optionally, the detection component 40 can be arranged on the side of the shell 20 away from the accommodating cavity, or on the side of the shell 20 facing the accommodating cavity. The detection component 40 is arranged on the side of the shell 20 away from the accommodating cavity, which can reduce the occupation of the internal space of the battery cell 7 by the detection component 40; the detection component 40 is arranged on the side of the shell 20 facing the accommodating cavity, which can reduce the overall volume of the battery cell 7. The detection component 40 can perform real-time detection of the working state of the battery cell 7, wherein the working state of the battery cell 7 includes but is not limited to voltage, temperature and other related data. By arranging the detection component 40 on the battery cell 7, it is convenient to control the working state of the battery cell 7 in real time, and can quickly warn of abnormal parameters in the operation of the battery cell 7, so that the corresponding safety agency or personnel can respond in time, thereby improving the safety and reliability of the battery cell 7.

[0094] In some embodiments, the housing 20 includes a first wall 30, and the detection assembly 40 is connected to the first wall 30. The first wall 30 may be any wall portion surrounding the housing 20 of the battery cell 7, and the connection between the detection assembly 40 and the first wall 30 may be, but is not limited to, welding, clamping, or bonding.

[0095] In some embodiments, the detection assembly 40 is located on the side of the first wall 30 away from the accommodating cavity, that is, the detection assembly 40 is located outside the battery cell 7. This can reduce the occupation of the internal space of the battery cell 7 by the detection assembly 40, which is conducive to improving the energy density of the battery cell 7. Furthermore, the detection assembly 40 is located on the side of the first wall 30 away from the accommodating cavity, which also facilitates the assembly of the detection assembly 40.

[0096] The protective structure 50 covers at least part of the surface of the detection assembly 40, which can reduce the risk of the detection assembly 40 being damaged during the production or use of the battery cell 7. Along the thickness direction of the first wall 30, the shape of the orthographic projection of the protective structure 50 on the first wall 30 can be rectangular, triangular or circular, etc. This application does not limit the shape of the orthographic projection of the protective structure 50 on the detection assembly 40, which can be selected according to actual conditions. Exemplarily, the protective structure 50 can be, but is not limited to, a sheet-like structure, a cover-like structure or a film-layer structure, etc.

[0097] In the above technical solution, by arranging the detection component 40 and the protection structure 50 for protecting the detection component 40 on the battery cell 7, the detection component 40 can detect the working state of the battery cell 7 in real time, and can quickly warn of abnormal parameters in the operation of the battery cell 7, so that the corresponding safety agencies or personnel can respond in time, thereby improving the safety and reliability of the battery cell 7. The protection structure 50 covers at least part of the surface of the detection component 40, which can reduce the risk of the detection component 40 being damaged during the production or use of the battery cell 7.

[0098] In some embodiments, the housing 20 includes an electrode terminal 31 , which protrudes from a surface of the first wall 30 facing away from the accommodating cavity. The electrode terminal 31 is electrically connected to the tab of the electrode assembly 10 , and the detection assembly 40 is electrically connected to the electrode terminal 31 .

[0099] Exemplarily, the connection method between the electrode terminal 31 and the first wall 30 may be, but is not limited to, welding, riveting or bonding, etc. The detection component 40 is electrically connected to the electrode terminal 31, and can detect the voltage, temperature and other related data at the electrode terminal 31 of the battery cell 7, so as to facilitate real-time control of the working state of the battery cell 7, and can quickly warn of abnormal parameters in the operation of the battery cell 7, so that the corresponding safety agency or personnel can respond in time, thereby improving the safety and reliability of the battery cell 7.

[0100] In some embodiments, along the thickness direction of the first wall 30 , a surface of the protection structure 50 facing away from the first wall 30 is not higher than a surface of the electrode terminal 31 facing away from the first wall 30 .

[0101] Exemplarily, in this embodiment, the concept of the present invention is explained by taking the detection component 40 disposed on the side of the first wall 30 away from the accommodating cavity as an example. The electrode terminal 31 protrudes from the surface of the side of the first wall 30 away from the accommodating cavity, and the protective structure 50 covers at least part of the surface of the detection component 40. Along the thickness direction of the first wall 30, the surface of the protective structure 50 away from the first wall 30 is not higher than the surface of the electrode terminal 31 away from the first wall 30, that is, the sum of the thickness of the protective structure 50 and the detection component 40 is not greater than the thickness of the surface of the electrode terminal 31 protruding from the side of the first wall 30 away from the accommodating cavity.

[0102] In the above technical solution, the protective structure 50 covers the surface of the detection component 40 without additionally increasing the thickness of the first wall 30, which is beneficial to reducing the overall volume of the battery cell 7. Further, it can reduce the risk of interference between the protective structure 50 and other components in the battery.

[0103] In some embodiments, the detection assembly 40 is located on the side of the first wall 30 facing the accommodating cavity, that is, the detection assembly 40 is located inside the battery cell 7. This is beneficial to reducing the overall volume of the battery cell 7. Furthermore, the detection assembly 40 being located on the side of the first wall 30 facing the accommodating cavity can also improve the flatness and integrity of the outer surface of the battery cell 7.

[0104] In some embodiments, the first wall 30 is provided with a recess 32, which is formed by a side surface of the first wall 30 that is away from the accommodating cavity and is recessed in a direction toward the accommodating cavity; or, the recess 32 is formed by a side surface of the first wall 30 that is toward the accommodating cavity and is recessed in a direction away from the accommodating cavity; the detection component 40 is at least partially accommodated in the recess 32.

[0105] Exemplarily, when the detection component 40 is disposed on the side of the first wall 30 away from the accommodating cavity, the recess 32 is formed by a surface of the first wall 30 on the side away from the accommodating cavity being recessed in a direction toward the accommodating cavity, and the detection component is at least partially accommodated in the recess 32. Along the thickness direction of the first wall 30, the shape of the orthographic projection of the recess 32 on the first wall 30 can be a rectangle, a triangle, a circle, etc., or can be a shape matching the outline of the detection component 40.

[0106] When the detection component 40 is disposed on the side of the first wall 30 facing the accommodating cavity, the recess 32 is formed by the surface of the first wall 30 facing the accommodating cavity being recessed in a direction away from the accommodating cavity, and the detection component is at least partially accommodated in the recess 32. Along the thickness direction of the first wall 30, the shape of the orthographic projection of the recess 32 on the first wall 30 can be a rectangle, a triangle, a circle, etc., or a shape matching the outline of the detection component 40.

[0107] Along the thickness direction of the first wall 30, the depth of the recess 32 may be greater than the thickness of the detection component 40, may be equal to the thickness of the detection component 40, or may be less than the thickness of the detection component 40. The present application does not limit the specific depth of the recess 32, which may be selected according to actual conditions.

[0108] By providing the recess 32 on the first wall 30 , the detection assembly 40 is at least partially accommodated in the recess 32 , thereby improving the flatness of the surface of the first wall 30 and reducing the risk of interference between the detection assembly 40 and other components in the battery.

[0109] In some embodiments, the shape and size of the protection structure 50 match the shape and size of the outer contour of the recess 32 .

[0110] The shape and size of the protection structure 50 match the shape and size of the outer contour of the recess 32 so that the protection structure 50 can be embedded in the recess 32, which can improve the tightness of the cooperation between the protection structure 50 and the recess 32 and further enhance the protection effect of the protection structure 50.

[0111] In some optional embodiments, along the thickness direction of the first wall 30 , the surface of the protection structure 50 away from the first wall 30 is not higher than the side surface of the first wall 30 away from the accommodating cavity, which can further improve the flatness of the surface of the first wall 30 .

[0112] Figure 6 A structural schematic diagram of a protection structure provided for some embodiments of the present application.

[0113] Continue to refer Figure 6 In some embodiments, the protection structure 50 includes a main body 51 , and the main body 51 covers at least a portion of the surface of the detection component 40 .

[0114] Specifically, the main body 51 of the protective structure 50 is a sheet-like structure. The main body 51 may be, but is not limited to, made of materials such as polyester resin, polyethylene or polypropylene. The specific implementation method of the main body 51 covering at least part of the surface of the detection component 40 may be that the main body 51 is connected to the first wall 30 and covers at least part of the surface of the detection component 40, wherein the connection method of the main body 51 and the first wall 30 may be, but is not limited to, welding, clamping or bonding. It is also possible that the main body 51 is directly connected to at least part of the surface of the detection component 40, wherein the connection method of the main body 51 and the detection component 40 may be, but is not limited to, welding, clamping or bonding. The sheet-like structure has a certain thickness and hardness, and thus has a strong ability to resist deformation, and can more effectively protect the detection component 40.

[0115] In the above technical solution, the main body 51 has a certain thickness and hardness, and thus has a strong ability to resist deformation, and can more effectively protect the detection component 40.

[0116] Figure 7 A schematic diagram of another protective structure provided for some embodiments of the present application;

[0117] Continue to refer Figure 7 In some embodiments, the protection structure 50 further includes a side portion 52 , which surrounds and is connected to the main body 51 to form a receiving space for receiving the detection component.

[0118] Specifically, the side portion 52 is connected around the main body 51 to form a cover-shaped structure with a storage space. The side portion 52 can be made of, but not limited to, polyester resin, polyethylene or polypropylene. The main body 51 and the side portion 52 can be an integrally formed structure, which can effectively improve the structural strength of the protective structure 50. The storage space can accommodate the detection component 40.

[0119] In the above technical solution, by setting the protective structure 50 as a cover-shaped structure with a accommodating space, the detection component 40 can be accommodated in the accommodating space while covering and protecting the detection component 40, thereby reducing the risk of interference between the protective structure 50 and the detection component 40, and further improving the protective effect of the protective structure 50.

[0120] In some embodiments, the protection structure 50 is a film layer structure, and the film layer structure is attached to at least a portion of the surface of the detection component 40 .

[0121] The membrane structure is made of high-strength flexible film material and auxiliary structure to generate a certain pre-tension stress inside it in a certain way, and achieve a certain spatial shape under the control of stress to form a covering structure. The membrane structure has sufficient rigidity to resist external loads.

[0122] In the above technical solution, the protective structure 50 is set as a film layer structure, which has a relatively thin thickness and can be attached to the surface of the detection component 40, which can effectively reduce the structural complexity of the protective structure 50. Furthermore, the film layer structure can be attached to the surface of the detection component 40 during the manufacturing process of the detection component 40 to form the protective structure 50, which is conducive to simplifying the process flow.

[0123] In some embodiments, the protection structure 50 is connected to the housing 20 by snapping or bonding.

[0124] Exemplarily, when the protective structure 50 is connected to the outer shell 20 of the battery cell 7 by bonding, the protective structure 50 includes a substrate and an adhesive layer, wherein the adhesive layer is used to bond with the outer shell 20 so that the protective structure 50 is fixedly connected to the outer shell 20. The substrate of the protective structure 50 has a higher hardness than the adhesive layer, and can effectively protect the detection component 40 from damage. At the same time, since the adhesive layer is relatively soft and has a high deformation capacity, after the protective structure 50 is connected to the outer shell 20 through the adhesive layer, the adhesive layer can play a certain sealing role in the gap between the protective structure 50 and the outer shell 20, preventing debris or dust from contacting the detection component 40 through the gap, thereby affecting the operation of the detection component 40. The protective effect of the protective structure 50 is further enhanced.

[0125] When the protective structure 50 is connected to the housing 20 of the battery cell 7 in a snap-fit ​​manner, the protective structure 50 includes a base and a snap-fit ​​member disposed on the base, and a snap-fit ​​structure corresponding to the snap-fit ​​member is disposed on the housing 20, and the snap-fit ​​member cooperates with the snap-fit ​​structure to snap-fit ​​the protective structure 50 to the housing 20. This is conducive to improving the convenience of installing the protective structure 50.

[0126] Figure 8 An exploded schematic diagram of a first wall of another battery cell provided in some embodiments of the present application.

[0127] Continue to refer Figure 8 In some embodiments, the battery cell 7 further includes an insulating member 33 for insulating the electrode terminal 31 from the first wall 30 ; the detection assembly 40 includes a sensing component 41 and a wire 42 connected to each other, and the sensing component 41 is electrically connected to the electrode terminal 31 through the wire 42 .

[0128] The location of the insulating member 33 is not limited. For example, the insulating member 33 can be disposed on the side of the first wall 30 away from the accommodating cavity, or on the side of the first wall 30 facing the accommodating cavity, or on both the side of the first wall 30 away from the accommodating cavity and the side of the first wall 30 facing the accommodating cavity. As long as the insulating member 33 can insulate the electrode terminal 31 from the first wall 30, it will be sufficient.

[0129] For example, in this embodiment, the insulating member 33 is disposed on the side of the first wall 30 away from the accommodating cavity to illustrate the concept of the present invention. The insulating member 33 is sleeved on the portion of the electrode terminal 31 protruding from the surface of the first wall 30 away from the accommodating cavity, and the insulating member 33 and the electrode terminal 31 are in contact with each other. The insulating member 33 is used to insulate the electrode terminal 31 from the first wall 30. The detection component 40 is disposed on the surface of the first wall 30 away from the accommodating cavity.

[0130] The detection assembly 40 includes a sensing component 41 and a wire 42 connected to each other. Exemplarily, the sensing component 41 is used to detect the working state of the battery cell 7. The sensing component 41 includes but is not limited to a temperature sensor, a pressure sensor, etc. The wire 42 is used to transmit an electrical signal to the sensing component 41, and the sensing component 41 is electrically connected to the electrode terminal 31 through the wire 42.

[0131] Fig. 9 A schematic diagram of the local structure of an electrode terminal of a battery cell provided in some embodiments of the present application.

[0132] Continue to refer Fig. 9 In some embodiments, a connection portion 43 is provided on a surface of the electrode terminal 31 facing away from the first wall 30, and the wire 42 is connected to the connection portion 43, so that the sensing component 41 is electrically connected to the electrode terminal 31. The connection portion 43 is the connection point between the electrode terminal 31 and the wire 42.

[0133] Fig.10 A schematic diagram of the local structure of an electrode terminal of another battery cell provided in some embodiments of the present application.

[0134] Continue to refer Fig.10In some embodiments, the insulating member 33 has a protrusion 331 protruding from a side surface of the electrode terminal 31 away from the first wall 30 , and the protrusion 331 is used to separate the side surface of the electrode terminal 31 away from the first wall 30 from the connecting portion 43 .

[0135] Since the battery cell 7 is not charged when it is assembled, it needs to be charged and activated. The process of charging the battery cell 7 for the first time is called formation, which is used to activate the active materials in the battery cell 7. During the formation of the battery cell 7, the formation nails will be inserted into the central area of ​​the electrode terminal 31 for formation. During this process, if the insertion of the formation nails is deviated, it is easy to accidentally touch the detection component 40, thereby causing damage to the detection component 40.

[0136] The insulating member 33 has a convex portion 331 protruding from the side surface of the electrode terminal 31 away from the first wall 30, and the convex portion 331 is used to separate the central area of ​​the side surface of the electrode terminal 31 away from the first wall 30 from the connecting portion 43. Among them, the convex portion 331 and the insulating member 33 can be an integrally formed structure. The insulating member 33 is integrally formed with the convex portion 331 by a stamping process, so that the convex portion 331 and the insulating member 33 are an integral structure. On the one hand, it is convenient to apply the convex portion 331 of this embodiment to the design of the existing insulating member 33 without making too many changes to the design of the existing insulating member 33; on the other hand, the insulating member 33 forms the convex portion 331 by a stamping process, the manufacturing process is simple, and the convex portion 331 can be formed without adding other materials.

[0137] By providing the protrusion 331 to separate the connection portion 43 from the central area of ​​the surface of the electrode terminal 31 facing away from the first wall 30 , the risk of the detection assembly 40 being damaged during the formation process of the battery cell 7 can be reduced.

[0138] Fig.11 A schematic diagram of the local structure of an electrode terminal of another battery cell provided in some embodiments of the present application.

[0139] Continue to refer Fig.11 In some embodiments, a through hole 332 is provided on the insulating member 33 , and the wire 42 is connected to the electrode terminal 31 through the through hole 332 .

[0140] Specifically, the insulating member 33 is provided with a through hole 332 on one side close to the detection component, and the sensing component 41 in the detection component is electrically connected to the electrode terminal 31 located inside the insulating member 33 through a wire 42 passing through the through hole 332 .

[0141] In the above technical solution, the wire 42 passes through the through hole 332 to be connected to the electrode terminal 31 located inside the insulating member 33, and the connecting portion 43 between the wire 42 and the electrode terminal 31 is located inside the insulating member 33, thereby reducing the risk of damage to the connecting portion 43 between the wire 42 and the electrode terminal 31 due to exposure to the external environment.

[0142] In some embodiments, the housing 20 includes a shell and an end cover, the shell has an opening, and the end cover is used to cover the opening; the end cover is the first wall 30 of the housing 20 .

[0143] The shell can be in various shapes, such as a cylinder, a cuboid, etc. The shape of the shell can be determined according to the specific shape of the electrode assembly 10. For example, if the electrode assembly 10 is a cylindrical structure, a cylindrical shell can be selected; if the electrode assembly 10 is a cuboid structure, a cuboid shell can be selected.

[0144] The end cap can be of various structures, for example, the end cap is a plate-like structure, a hollow structure with one end open, etc. Exemplarily, the housing is a rectangular parallelepiped structure, the end cap is a plate-like structure, and the end cap covers the opening at the top of the housing. The end cap can be made of an insulating material (such as plastic) or a conductive material (such as metal).

[0145] In the embodiment of the present application, the first wall 30 may be an end cap. Optionally, the detection assembly 40 may be disposed on a side of the end cap away from the accommodating cavity, or may be disposed on a side of the end cap facing the accommodating cavity. The connection method between the detection assembly 40 and the end cap may be, but is not limited to, welding, clamping or bonding.

[0146] Fig.12 A schematic structural diagram of another protective structure provided for some embodiments of the present application.

[0147] Continue to refer Fig.12 In some embodiments, a reinforcement portion 53 is provided on the protection structure 50 , and the reinforcement portion 53 is formed by protruding from the surface of the protection structure 50 on the side facing away from the detection component 40 .

[0148] Specifically, the reinforcing portion 53 may be a reinforcing rib provided on the surface of the protective structure 50 on the side facing away from the detection component 40. The reinforcing portion 53 may reduce the deformation of the protective structure 50, enhance the compressive strength of the protective structure 50, and thereby increase the service life of the protective structure 50. The reinforcing portion 53 and the protective structure 50 may be an integrally formed structure. The protective structure 50 is integrally formed with the reinforcing portion 53 by a stamping process, and the manufacturing process is simple and does not require the addition of other materials. The reinforcing portion 53 is formed by protruding from the surface of the protective structure 50 on the side facing away from the detection component 40, which can avoid contact between the reinforcing portion 53 and the detection component 40, and can reduce the risk of interference between the protective structure 50 and the detection component 40.

[0149] In the above technical solution, by providing the reinforcement portion 53 on the protection structure 50 , the compressive strength of the protection structure 50 can be enhanced, and the protection effect of the protection structure 50 is further improved.

[0150] In some embodiments, the material of the protection structure 50 is an insulating material.

[0151] The battery cell 7 is continuously charged and discharged during use, and a lot of heat is generated during the charging and discharging process. The protection structure 50 and the detection component 40 are prone to the risk of contact interference. Exemplary insulating materials can be polytetrafluoroethylene, polyphenylene sulfide, polyetheretherketone, polyphenyl ester, etc. This application does not limit the specific material, and it can be selected according to actual conditions.

[0152] By using insulating and heat-insulating materials to make the protection structure 50, the influence of the heat generated by the battery cell 7 during use on the protection structure 50 can be reduced, thereby increasing the service life of the protection structure 50. At the same time, the risk of short circuit caused by contact interference between the protection structure 50 and the detection component 40 can be reduced, thereby affecting the normal use of the detection component 40.

[0153] According to some embodiments of the present application, the present application also provides a battery, comprising the battery cell of the above solution.

[0154] According to some embodiments of the present application, the present application also provides an electrical device, comprising a battery cell according to the above solution, wherein the battery cell is used to provide electrical energy.

[0155] In order to better understand the battery cells provided in the embodiments of the present application, based on the same inventive concept, embodiments of the above-mentioned battery cells in practical applications are provided herein for illustration.

[0156] The embodiment of the present application provides a battery cell 7, which includes a shell, an electrode assembly 10, an end cover, an electrode terminal 31, an insulating member 33, a detection assembly 40 and a protective structure 50. The shell has an opening and a receiving cavity, the electrode assembly 10 is received in the receiving cavity, and the end cover covers the opening of the shell. The end cover is provided with a recess 32, which is formed by a side surface of the end cover facing away from the receiving cavity and concave in the direction toward the receiving cavity; the detection assembly 40 is at least partially received in the recess 32, and the protective structure 50 covers at least part of the surface of the detection assembly 40. The material of the protective structure 50 is an insulating and heat-insulating material.

[0157] Furthermore, the electrode terminal 31 protrudes from a side surface of the end cover away from the accommodating cavity, the electrode terminal 31 is electrically connected to the electrode tab of the electrode assembly 10 , and the detection assembly 40 is electrically connected to the electrode terminal 31 .

[0158] Furthermore, the insulating member 33 is used to insulate the electrode terminal 31 from the end cap; the detection assembly 40 includes a sensing component 41 and a wire 42 that are connected to each other, and the sensing component 41 is electrically connected to the electrode terminal 31 through the wire 42.

[0159] In the above technical solution, by arranging the detection component 40 and the protection structure 50 for protecting the detection component 40 on the battery cell 7, the detection component 40 can detect the working state of the battery cell 7 in real time, and can quickly warn of abnormal parameters in the operation of the battery cell 7, so that the corresponding safety agencies or personnel can respond in time, thereby improving the safety and reliability of the battery cell 7. The protection structure 50 covers at least part of the surface of the detection component 40, which can reduce the risk of the detection component 40 being damaged during the production or use of the battery cell 7.

[0160] 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.

[0161] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery cell, characterized in that: include: A housing having a receiving cavity; An electrode assembly, accommodated in the accommodation cavity; A detection component, connected to the housing and used to detect the working state of the battery cell; A protective structure covering at least a portion of the surface of the detection component; The protective structure includes a main body and a side portion, wherein the main body covers at least a portion of the surface of the detection component, and the side portion surrounds and is connected to the main body to form a receiving space, and the receiving space is used to receive the detection component.

2. The battery cell according to claim 1, characterized in that: The housing includes a first wall, and the detection component is connected to the first wall.

3. The battery cell according to claim 2, characterized in that: The detection component is located on a side of the first wall away from the accommodating cavity.

4. The battery cell according to claim 3, characterized in that: The housing includes an electrode terminal, which protrudes from a surface of the first wall on one side away from the accommodating cavity, is electrically connected to a tab of the electrode assembly, and the detection assembly is electrically connected to the electrode terminal.

5. The battery cell according to claim 4, characterized in that: Along the thickness direction of the first wall, a surface of the protection structure facing away from the first wall is not higher than a surface of the electrode terminal facing away from the first wall.

6. The battery cell according to claim 2, characterized in that: The detection component is located on a side of the first wall facing the accommodating cavity.

7. The battery cell according to any one of claims 2 to 6, characterized in that: The first wall is provided with a concave portion, and the concave portion is formed by a surface of the first wall on one side facing away from the accommodating cavity and concave in a direction toward the accommodating cavity; Alternatively, the recessed portion is formed by a surface of one side of the first wall facing the accommodating cavity being recessed in a direction away from the accommodating cavity; The detection component is at least partially accommodated in the recess.

8. The battery cell according to claim 7, characterized in that: The shape and size of the protection structure match the shape and size of the outer contour of the recess.

9. The battery cell according to claim 7, characterized in that: Along the thickness direction of the first wall, a surface of the protection structure facing away from the first wall is not higher than a side surface of the first wall facing away from the accommodating cavity.

10. The battery cell according to any one of claims 1 to 6, characterized in that: The protection structure is a film layer structure, and the film layer structure is attached to at least a portion of the surface of the detection component.

11. The battery cell according to claim 1, characterized in that: The protection structure is connected to the housing by means of clamping or bonding.

12. The battery cell according to claim 4 or 5, characterized in that: The battery cell further includes an insulating member, the insulating member being used to insulate the electrode terminal from the first wall; The detection component includes a sensing component and a wire connected to each other, and the sensing component is electrically connected to the electrode terminal through the wire.

13. The battery cell according to claim 12, characterized in that: A connecting portion is provided on a surface of the electrode terminal on one side away from the first wall, and the wire is connected to the connecting portion so that the sensor component is electrically connected to the electrode terminal.

14. The battery cell according to claim 13, characterized in that: The insulating member has a protrusion protruding from a side surface of the electrode terminal away from the first wall, and the protrusion is used to separate the side surface of the electrode terminal away from the first wall from the connecting portion.

15. The battery cell according to claim 12, characterized in that: The insulating member is provided with a through hole, and the wire is connected to the electrode terminal through the through hole.

16. The battery cell according to claim 2, characterized in that: The housing comprises a shell and an end cover, the shell has an opening, and the end cover is used to cover the opening; The end cap is a first wall of the housing.

17. The battery cell according to claim 1, characterized in that: The protection structure is provided with a reinforcement portion, and the reinforcement portion is formed by protruding from the surface of the protection structure on a side facing away from the detection component.

18. The battery cell according to claim 1, characterized in that: The material of the protection structure is insulating and heat-insulating material.

19. A battery, characterized in that: The invention comprises a plurality of battery cells according to any one of claims 1 to 18.

20. An electrical device, characterized in that: The battery cell comprises the battery cell according to any one of claims 1 to 18, wherein the battery cell is used to provide electrical energy.

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