Battery cell, battery and electric device

Abstract

The utility model is suitable for the technical field of batteries, and provides a battery monomer, a battery and an electric device. Each battery monomer comprises a shell, an electrode assembly, an insulating member and a supporting member; the shell comprises a wall part; the electrode assembly is accommodated in the shell; the insulating component is arranged on one side, facing the electrode assembly, of the wall part, and an accommodating space is formed in the insulating component; the supporting component is arranged in the accommodating space; wherein the insulating component comprises a light-transmitting part, and at least part of the light-transmitting part and at least part of the supporting component are oppositely arranged; the insulating component further comprises a component body, and the light-transmitting part and the containing space are both arranged on the component body. The light-transmitting part comprises a through part communicating the containing space and the external space. According to the battery monomer, the battery and the power utilization device provided by the invention, whether the supporting component is neglected to be mounted or not can be detected.

Description

Technical Field

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

[0002] In the related art, a support member is arranged between the outer shell and the insulating member of the battery cell to facilitate exhaust of the battery cell in the later stage of thermal runaway. However, after the insulating member and the outer shell are assembled, the support member will be blocked by the insulating member, making it difficult to detect whether the support member is missing. Utility Model Content

[0003] In view of the above problems, the present application provides a battery cell, a battery and an electrical device, aiming to improve the technical problem that it is difficult to detect whether a supporting member is missing.

[0004] In the first aspect, an embodiment of the present application provides a battery cell, comprising: a housing, including a wall portion; an electrode assembly, contained in the housing; an insulating member, disposed on a side of the wall portion facing the electrode assembly, and a containing space is provided on the insulating member; and a supporting member, disposed in the containing space; wherein the insulating member comprises a light-transmitting portion, and at least a portion of the light-transmitting portion is disposed opposite to at least a portion of the supporting member. In the battery cell provided by the embodiment of the present application, a light-transmitting portion is disposed in the insulating member, and at least a portion of the light-transmitting portion is disposed opposite to at least a portion of the supporting member, and through the light-transmitting portion, it is possible to observe whether the supporting member is installed, thereby reducing the risk of missing the supporting member.

[0005] In some embodiments, the light-transmitting portion includes a through portion connecting the accommodating space and the external space. The light-transmitting portion includes the through portion, which has a simple structure and is easy to prepare.

[0006] In some embodiments, the light-transmitting portion includes a light-transmitting material. Compared with the light-transmitting portion including the through portion, the light-transmitting portion including the light-transmitting material can simplify the processing of the insulating component and has less impact on the supporting strength of the insulating component.

[0007] In some embodiments, the insulating member forms a boss on one side facing the electrode assembly, and the boss forms the accommodation space on the side facing away from the electrode assembly. Since the accommodation space can accommodate the entire support member, and the support member is provided with a second exhaust channel, the dimension of the support member in the normal direction of the wall portion of the support member facing the support member is generally greater than the thickness of the main body of the insulating member. The solution provided in this embodiment can reduce the thickness of the main body of the insulating member, which is convenient for the lightweight design of the battery cell.

[0008] In some embodiments, the boss is located at the end and / or the middle of the insulating member in the length direction, which will not affect the installation of the electrode tab in the electrode assembly.

[0009] In some embodiments, the light-transmitting portion is disposed on the side wall of the accommodation space. Since the support member is disposed in the accommodation space, the light-transmitting portion is disposed on the side wall of the accommodation space so that the light-transmitting portion is close to the support member, making it easy to observe whether the support member is located in the accommodation space.

[0010] In some embodiments, the height of the light-transmitting portion is greater than 0.5 mm and less than or equal to the height of the insulating member. The height of the light-transmitting portion is greater than 0.5 mm and less than or equal to the height of the insulating member, which is convenient for observing whether the supporting member is installed through the light-transmitting portion, and also makes the height of the light-transmitting portion not exceed the height of the insulating member, which is convenient for the preparation of the light-transmitting portion.

[0011] In some embodiments, the height of the light-transmitting portion is 0.5 mm to 10 mm. When the height of the light-transmitting portion is 0.5 mm to 10 mm, it is convenient to observe whether the supporting member is installed through the light-transmitting portion, and the height of the light-transmitting portion does not exceed the accommodation space, which is convenient for the preparation of the light-transmitting portion when the light-transmitting portion includes the above-mentioned through portion.

[0012] In some embodiments, the height of the light-transmitting portion is 0.5 mm to 4 mm. When the height of the light-transmitting portion is 0.5 mm to 4 mm, it is convenient to observe whether the supporting member is installed through the light-transmitting portion, and a certain distance is left between the light-transmitting portion and the bottom surface of the boss, so that when the light-transmitting portion includes the above-mentioned through portion, the setting position of the light-transmitting portion will not have a significant impact on the supporting strength of the insulating member.

[0013] In some embodiments, the battery cell further includes an insulating film, which is coated on the outside of the electrode assembly and connected to the insulating member via a connecting portion. The provision of the insulating film can further reduce the risk of electrical connection between the electrode assembly and the housing, thereby improving the safety of the battery cell.

[0014] In some embodiments, the connection portion and the light-transmitting portion are staggered, so that the connection portion and the light-transmitting portion do not affect each other, which is convenient for the detection of missing support components and ensures a stable connection between the insulating film and the insulating component.

[0015] In some embodiments, the connecting portion is located on a side of the light-transmitting portion close to the electrode assembly. In this way, when the light-transmitting portion includes the through-portion, the through-portion can be located outside the cavity surrounded by the insulating film and the insulating member, so that the electrode assembly is located in the cavity with good insulation performance, which can improve the safety of the battery cell to a certain extent.

[0016] In some embodiments, the distance between the connecting portion and the light-transmitting portion is greater than or equal to 0.5 mm, so that the connecting portion and the light-transmitting portion can still be spaced apart when there is a processing error.

[0017] In some embodiments, the support member is connected to the wall portion, so that after the insulating member is melted, the position of the support member does not change, so that it can still be supported between the wall portion and the main body of the electrode assembly to ensure the exhaust effect of the second exhaust channel.

[0018] In some embodiments, the support member includes: a first support portion connected to the wall portion; and a second support portion provided between the first support portion and the insulating member and connected to the first support portion, wherein the second support portion and the first support portion form an exhaust channel. The support member adopts the structure provided in this embodiment, which is simple in structure and easy to process.

[0019] In some embodiments, the second support portion includes: a first sheet disposed opposite to the first support portion; and a second sheet connecting the first sheet and the first support portion. The second support portion adopts the structure provided by this embodiment, which is simple in structure and easy to process.

[0020] In some embodiments, the second sheet and the first sheet can be deformed under the action of an external force to enclose an exhaust channel with a triangular cross section with at least part of the first support portion. By adopting the solution provided in this embodiment, in the case of thermal runaway, when the electrode assembly moves toward the wall, the second sheet will not fit with the first support portion to squeeze out the second exhaust channel, but the first sheet, the second sheet and the first support portion will form an exhaust channel with a triangular cross section, thereby achieving stable support for the electrode assembly and ensuring that the second exhaust channel still exists, which can improve the safety of the battery cell in the case of thermal runaway to a certain extent.

[0021] In some embodiments, the second sheet is integrally formed with the first sheet, so that the connection structure between the second sheet and the first sheet is stable.

[0022] In some embodiments, the wall portion is an end cover of the housing, and the insulating member is located on the top of the electrode assembly. The solution provided in this embodiment is suitable for a battery cell with a pressure relief mechanism disposed on the top of the housing.

[0023] In some embodiments, the wall portion is the bottom plate of the housing, and the insulating member is located at the bottom of the electrode assembly to support the electrode assembly. The solution provided in this embodiment is suitable for battery cells with a pressure relief mechanism disposed on the bottom plate of the housing.

[0024] In a second aspect, an embodiment of the present application provides a battery, comprising a battery cell provided by any of the above solutions.

[0025] The battery provided in the embodiments of the present application, including the battery cell provided in any of the above embodiments, can detect whether the supporting member is missing.

[0026] In a third aspect, an embodiment of the present application provides an electrical device, comprising a battery provided by any of the above solutions.

[0027] The electrical device provided in the embodiment of the present application, including the battery provided in any of the above embodiments, can detect whether the supporting member is missing.

[0028] 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

[0029] 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. Moreover, the same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0030] Figure 1 A schematic diagram of the structure of a vehicle according to some embodiments of the present application;

[0031] Figure 2 A schematic diagram of the exploded structure of a battery according to some embodiments of the present application;

[0032] Figure 3 A schematic diagram of the exploded structure of a battery cell according to some embodiments of the present application;

[0033] Figure 4 for Figure 3 The schematic diagram of the main structure of the battery cell shown;

[0034] Figure 5 For battery cells Figure 4 Schematic diagram of the cross-sectional structure in the AA direction;

[0035] Figure 6 for Figure 5 A schematic diagram of the local enlarged structure at point A in the middle;

[0036] Figure 7 A partially enlarged structural schematic diagram of a battery cell in some embodiments of the present application;

[0037] Figure 8 for Figure 3 Schematic diagram of the exploded structure of the insulating member and the supporting member;

[0038] Fig. 9 for Figure 8 A schematic diagram of the local enlarged structure at B in the middle;

[0039] Fig.10 A schematic side view of an end cover and an insulating component assembly in a battery cell in some embodiments of the present application;

[0040] Fig.11 A partially enlarged structural schematic diagram of a battery cell in some embodiments of the present application;

[0041] Fig.12 This is a schematic diagram of the structure of a support component in a battery cell according to some embodiments of the present application.

[0042] The reference numerals in the specific implementation manner are as follows:

[0043] 1000. Vehicles;

[0044] 100, battery; 200, controller; 300, motor;

[0045] 10. Box body; 11. First part; 12. Second part;

[0046] 20. Battery cell; 20', housing; 21. End cap; 21a. Electrode terminal; 22. Housing; 22a. Wall; 22b. Pressure relief mechanism; 23. Electrode assembly; 23a. Tab; 23b. Main body; 24. Insulating member; 24a. First exhaust channel; 24b. Accommodating space; 24c. Translucent part; 25. Support member; 25a. Second exhaust channel; 26. Insulating film; 26a. Connecting part; 27. Adapter; 28. Bottom support plate; 29. ​​Wrapping paper;

[0047] 241, light-transmitting portion; 242, component body; 243, boss; 251, first supporting portion; 252, second supporting portion;

[0048] 24b1, first side wall; 2521, first sheet body; 2522, second sheet body;

[0049] H1, height of the light-transmitting portion; H2, height of the insulating component; H3, distance between the connecting portion and the light-transmitting portion. DETAILED DESCRIPTION

[0050] 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.

[0051] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein 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 figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0052] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0053] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations 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. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0054] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may 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 article generally indicates that the associated objects before and after are in an "or" relationship.

[0055] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0056] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0057] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like 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 mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0058] 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.

[0059] Research on battery thermal runaway is becoming increasingly important. Battery thermal runaway refers to a cumulative enhancement of current and battery temperature and gradual damage when the battery is charged at a constant voltage. This is mainly due to the fact that the heat generation rate inside the battery is much higher than the heat dissipation rate, and a large amount of heat is accumulated inside the battery, causing a chain reaction, leading to battery fire and explosion. There are both internal and external factors that cause battery thermal runaway. Among them, the internal factors are mainly: internal short circuit caused by defects in battery production; improper use of batteries, resulting in the generation of lithium dendrites inside, causing short circuits between the positive and negative electrodes, etc. The external factors are mainly: external factors such as extrusion and puncture causing battery short circuits; external short circuits of batteries causing excessive accumulation of heat inside the battery, etc.

[0060] In order to reduce the risk of explosion in the state of thermal runaway of the battery, an explosion-proof valve is generally provided on the battery. In addition, an insulating component is generally provided between the electrode assembly of the battery and the explosion-proof valve. The insulating component is provided with an exhaust channel so that the gas on the electrode assembly side can quickly pass through the exhaust channel to the location of the explosion-proof valve in the state of thermal runaway, and exhaust is achieved through the explosion-proof valve, so that the pressure can be released in time during the thermal runaway process of the battery.

[0061] However, the current insulating components have a low melting point and are easily melted in a thermal runaway state. At the same time, the electrode assembly is easily moved toward the side of the explosion-proof valve under the impact of the high-pressure airflow in the battery casing, thereby abutting against the side wall of the battery cell equipped with the explosion-proof valve, closing the exhaust channel between the electrode assembly and the explosion-proof valve, and preventing the gas in the side cavity from quickly flowing to the bottom of the explosion-proof valve for exhaust, causing the side weld of the battery cell to burst, and high-temperature metal particles to spray to adjacent battery cells, causing heat spread.

[0062] In order to improve the above problems, in the related art, a support member with a higher melting point than the insulating member is added to the battery cell, and a second exhaust channel is set in the support member. In this way, the structural reliability of the support member can be higher than that of the insulating member, and the battery cell can be exhausted to the location of the pressure relief mechanism through the first exhaust channel in the early stage of thermal runaway. After the first exhaust channel is melted in the later stage of thermal runaway, exhaust can be achieved with the help of the second exhaust channel, so that the battery cell provided in this embodiment can continue to maintain the connection between the side cavity and the pressure relief mechanism at all stages of thermal failure, so as to reduce the risk of cracking on the side of the battery cell and improve the safety of the battery cell. However, when the battery cell is assembled, the insulating member will block the support member after being installed on the shell, making it difficult to detect whether the support member is missing.

[0063] To solve the above problems, an embodiment of the present application provides a battery cell, in which a light-transmitting portion is arranged in an insulating component, and at least a portion of the light-transmitting portion is arranged opposite to at least a portion of the supporting component. Through the light-transmitting portion, it can be observed whether the supporting component is installed, thereby reducing the risk of missing the supporting component.

[0064] The battery cell disclosed in the embodiments of the present application can be used in electrical devices that use batteries as power sources or various energy storage systems that use batteries as energy storage elements. Electrical devices can be, but are not limited to, mobile phones, tablets, laptops, electric toys, electric tools, battery cars, electric cars, ships, spacecraft, etc. Among them, electric toys can include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc., and spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0065] 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.

[0066] 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.

[0067] 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.

[0068] Please refer to Figure 2 , Figure 2 An exploded view of a battery 100 provided in some embodiments of the present application. The battery 100 includes a box 10 and a battery cell 20, and the battery cell 20 is contained in the box 10. Among them, the box 10 is used to provide a storage space for the battery cell 20, and the box 10 can adopt a variety of structures. In some embodiments, the box 10 may include a first part 11 and a second part 12, the first part 11 and the second part 12 cover each other, and the first part 11 and the second part 12 jointly define a storage space for accommodating the battery cell 20. The second part 12 may be a hollow structure with one end open, the first part 11 may be a plate-like structure, and the first part 11 covers the open side of the second part 12, so that the first part 11 and the second part 12 jointly define a storage space; the first part 11 and the second part 12 may also be hollow structures with one side open, and the open side of the first part 11 covers the open side of the second part 12. Of course, the box 10 formed by the first part 11 and the second part 12 may be in a variety of shapes, such as a cylinder, a cuboid, etc. In some cases, the battery cells can also be directly installed in the vehicle without a box or shell, that is, there is no need to form a battery pack, and the structure of the vehicle body itself serves as a fixing structure for the battery cells.

[0069] In the battery 100, there may be multiple battery cells 20, and the multiple battery cells 20 may be connected in series, in parallel, or in a mixed connection. A mixed connection means that the multiple battery cells 20 are both connected in series and in parallel. The multiple battery cells 20 may be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by the multiple battery cells 20 is accommodated in the box 10; of course, the battery 100 may also be a battery module formed by connecting multiple battery cells 20 in series, in parallel, or in a mixed connection, and then the multiple battery modules are connected in series, in parallel, or in a mixed 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 the multiple battery cells 20.

[0070] Each battery cell 20 may be a secondary battery or a primary battery, or 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.

[0071] Please refer to Figure 3 , Figure 3The schematic diagram of the exploded structure of the battery cell 20 provided in some embodiments of the present application. The battery cell 20 refers to the smallest unit that constitutes the battery. Figure 3 The battery cell 20 includes a shell 20', an electrode assembly 23 and other functional components. Among them, the shell 20' is a closed structure, which can form the internal environment of the battery cell 20, and generally includes an end cover 21 and a shell 22. The shell 22 and the end cover 21 can be two independent components. An opening can be set on the shell 22, and the shell 20' is formed by covering the opening with the end cover 21. Without limitation, the shell 20' can also be an integrated structure, that is, the end cover 21 and the shell 22 are integrated. Specifically, the end cover 21 and the shell 22 can form a common connection surface before other components are put into the shell. When the interior of the shell 22 needs to be encapsulated, the end cover 21 is covered with the shell 22.

[0072] Among them, the end cap 21 refers to a component that covers the opening of the shell 22 to isolate the internal environment of the battery cell 20 from the external environment. Without limitation, the shape of the end cap 21 can be adapted to the shape of the shell 22 to match the shell 22. Optionally, the end cap 21 can be made of a material with a certain hardness and strength, such as an aluminum alloy, so that the end cap 21 is not easily deformed when squeezed and collided, so that the battery cell 20 can have a higher structural strength and the safety performance can also be improved. Functional components such as electrode terminals 21a can be provided on the end cap 21. The electrode terminal 21a can be used to electrically connect to the electrode assembly 23 for outputting or inputting electrical energy of the battery cell 20. In some embodiments, the end cap 21 can also be provided with a pressure relief mechanism for releasing the internal pressure when the internal pressure or temperature of the battery cell 20 reaches a threshold. The material of the end cap 21 can also be a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiment of the present application does not impose any special restrictions on this. In some embodiments, an insulating member may be provided inside the end cap 21 to isolate the electrical connection components in the housing 22 from the end cap 21 to reduce the risk of short circuit. For example, the insulating member may be plastic, rubber, or the like.

[0073] The shell 22 is a component used to cooperate with the end cap 21 to form the internal environment of the battery cell 20, wherein the formed internal environment can be used to accommodate the electrode assembly 23, the electrolyte and other components. The shell 22 can be of various shapes and sizes, such as a rectangular parallelepiped, a cylindrical shape, a hexagonal prism, etc. Specifically, the shape of the shell 22 can be determined according to the specific shape and size of the electrode assembly 23. The material of the shell 22 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application do not impose any special restrictions on this.

[0074] The electrode assembly 23 is a component in the battery cell 100 where electrochemical reactions occur. One or more electrode assemblies 23 may be included in the housing 22. The electrode assembly 23 is mainly formed by winding or stacking positive and negative electrode sheets, and a separator is usually provided between the positive and negative electrode sheets. The parts of the positive and negative electrode sheets with active materials constitute the main body of the electrode assembly, and the parts of the positive and negative electrode sheets without active materials each constitute a tab 23a. The positive tab and the negative tab may be located together at one end of the main body or at both ends of the main body, respectively. During the charge and discharge process of the battery, the positive active material and the negative active material react with the electrolyte, and the tab 23a connects the electrode terminals to form a current loop.

[0075] like Figures 3 to 6 As shown, an embodiment of the present application provides a battery cell 20. The battery cell 20 includes a shell 20', an electrode assembly 23, an insulating member 24 and a support member 25. The shell 20' includes a wall portion 22a. The electrode assembly 23 is accommodated in the shell 20'. The insulating member 24 is arranged on the side of the wall portion 22a facing the electrode assembly 23, and a receiving space 24b is provided on the insulating member 24. The support member 25 is arranged in the receiving space 24b. Among them, the insulating member 24 includes a light-transmitting portion 241. At least a portion of the light-transmitting portion 241 is arranged opposite to at least a portion of the support member 25.

[0076] As mentioned above, the outer shell 20' is a closed structure, which is used to form the internal environment of the battery cell 20, and generally includes an end cover 21 and a shell 22. The shell 22 and the end cover 21 can be two independent parts, or an integrated structure, which will not be repeated here. Among them, the shell 22 generally has multiple side walls and a bottom wall, and the end cover 21 is generally a single board or a combined board with a certain thickness. The wall portion 22a can be a side wall in the shell 22 or the bottom wall of the shell 22, or it can be an end cover 21, which can be set according to the specific needs of use.

[0077] The insulating member 24 is a member disposed between the wall portion 22a and the electrode assembly 23, and may be composed of one component or a combination of multiple components. The insulating member 24 may be made of insulating materials in all parts, or may be made of insulating materials in one part and non-insulating materials in another part. For example, the insulating member 24 includes a metal member and an insulating sleeve coated on the outside of the metal member. Regardless of the arrangement of the insulating member 24, as long as the insulating member 24 can achieve insulating contact between the electrode assembly 23 and the housing 20'.

[0078] Generally, the insulating member 24 is provided with a first exhaust channel 24a. The first exhaust channel 24a can be a hole, a microporous structure, an opening, etc. opened on the insulating member 24, and can be determined according to the specific use needs. Through the first exhaust channel 24a, the gas located on the side of the main body 23b of the electrode assembly 23 (i.e., in the first space) can flow to the space between the insulating member 24 and the wall 22a (i.e., the second space). Among them, the main body 23b of the electrode assembly 23 is the part of the electrode assembly 23 where the positive electrode sheet has an active material layer and the negative electrode sheet has an active material layer, and is also the part of the electrode assembly 23 except the tab 23a.

[0079] The support member 25 is generally provided with a second exhaust channel 25a, which can be a hole, a microporous structure, an opening, etc., opened on the support member 25, and can be determined according to the use requirements. Through the second exhaust channel 25a, the gas located on the side where the main body 23b of the electrode assembly 23 is located (i.e., in the first space) can flow into the space between the insulating member 24 and the wall 22a (i.e., the second space).

[0080] The support member 25 can be supported between the main body 23b and the wall 22a of the electrode assembly 23 after at least part of the insulating member 24 is heat-melted, so that the gas on the side of the main body 23b of the electrode assembly 23 (i.e., the gas in the first space) can flow to the location of the pressure relief mechanism 22b (i.e., the second space) through the second exhaust channel 25a on the support member 25. Exemplarily, the support member 25 can be made of a material such as metal or ceramic having a higher melting point than the melting point of the insulating member 24. The melting point is the temperature at which a solid changes its physical state from a solid state (melts) to a liquid state. The melting point of the support member 25 is the temperature at which the physical state of the support member 25 changes (melts) from a solid state to a liquid state, and the melting point of the insulating member 24 is the temperature at which the physical state of the insulating member 24 changes (melts) from a solid state to a liquid state.

[0081] It is understandable that in the initial state, that is, before the insulating component 24 is hot-melted, the second exhaust channel 25a can be blocked or exposed, as long as the first space and the second space can be connected after the insulating component 24 is hot-melted.

[0082] The accommodating space 24b may be a groove, a cavity, etc. formed on the insulating member 24, and its size is generally larger than the supporting member 25, and is mainly used to accommodate the supporting member 25. The accommodating space 24b may be arranged in a staggered manner with the first exhaust passage 24a, and the two may also partially overlap, or even completely overlap, depending on the specific use needs. When the accommodating space 24b and the first exhaust passage 24a are arranged in a staggered manner, the arrangement of the supporting member 25 will not adversely affect the function of the first exhaust passage 24a. When the accommodating space 24b at least partially overlaps with the first exhaust passage 24a, the structure of the insulating member 24 can be made compact and easy to process.

[0083] The light-transmitting portion 241 refers to a structure or component that allows light to pass through, such as a through hole or a notch that communicates with the inner cavity of the accommodating space 24b, or a solid structure that allows light to pass through, such as glass, resin, etc. The insulating member 24 includes the light-transmitting portion 241 in at least the following cases: first, the insulating member 24 can be composed of only the light-transmitting portion 241, in which case the light-transmitting portion 241 is a solid structure made of a light-transmitting material; second, the insulating member 24 includes not only the light-transmitting portion 241 but also other components, in which case the light-transmitting portion 241 can be a solid structure that allows light to pass through, or a virtual structure such as a through hole or a notch, which can be determined according to the use requirements.

[0084] At least part of the light-transmitting portion 241 is disposed opposite to at least part of the supporting member 25, including at least the following situations: first, part of the light-transmitting portion 241 is disposed opposite to part of the supporting member 25; second, the entire light-transmitting portion 241 is disposed opposite to part of the supporting member 25; third, part of the light-transmitting portion 241 is disposed opposite to the entire supporting member 25; fourth, the light-transmitting portion 241 is disposed opposite to the supporting member 25. Regardless of which of the above situations is adopted, it is sufficient as long as the existence of the supporting member 25 can be observed through the light-transmitting portion 241.

[0085] The battery cell 20 provided in the embodiment of the present application has a light-transmitting portion 241 arranged in the insulating member 24, and at least a portion of the light-transmitting portion 241 is arranged opposite to at least a portion of the support member 25. Through the light-transmitting portion 241, it can be observed whether the support member 25 is installed, thereby reducing the risk of missing the support member 25.

[0086] like Figure 6 and Figure 7 As shown, in some embodiments, the light-transmitting portion 241 includes a through portion connecting the accommodating space 24b and the external space.

[0087] The through portion may be a through hole, a notch, a tube, etc. connecting the accommodating space 24b and the external space. It may be arranged through the side wall of the accommodating space 24b, or through the bottom wall of the accommodating space 24b, depending on the specific usage requirements.

[0088] It is understandable that if the light-transmitting portion 241 includes a solid structure in addition to the above-mentioned through-portion, the insulating component 24 may include only the light-transmitting portion 241, or include both the light-transmitting portion 241 and other structures. If the light-transmitting portion 241 includes only the above-mentioned through-portion, the insulating component 24 includes not only the light-transmitting portion 241, but also a component body 242, and the light-transmitting portion 241 and the accommodating space 24b are both arranged on the component body 242. The component body 242 is the main component of the insulating component 24, and may be composed of one component or a combination of multiple components. The component body 242 may be made of insulating materials in all parts, or may be made of insulating materials in one part and non-insulating materials in another part, which may be determined according to the needs of use.

[0089] The light-transmitting portion 241 includes a through portion, has a simple structure, and is easy to prepare.

[0090] In other embodiments, the light-transmitting portion 241 includes a light-transmitting material. The light-transmitting material is a material that allows light to pass through, such as glass, resin, etc. The body is a solid structure made of light-transmitting material, which can be a solid structure or a hollow structure, depending on the specific use requirements.

[0091] The light-transmitting portion 241 includes a light-transmitting material. Compared with the light-transmitting portion 241 including the through portion, the processing technology of the insulating component 24 can be simplified and the support strength of the insulating component 24 is less affected.

[0092] like Figure 8 and Fig. 9 As shown, in some embodiments, a boss 243 is formed on a side of the insulating member 24 facing the electrode assembly 23 , and a receiving space 24 b is formed on a side of the boss 243 facing away from the electrode assembly 23 .

[0093] The boss 243 is generally a block protruding from one side of the insulating member 24 toward the electrode assembly 23, and one or more bosses may be provided. The boss 243 may be integrally formed on the main body of the insulating member 24, or may be installed on the main body of the insulating member 24 by plugging, snapping, etc. The main body of the insulating member 24 refers to the portion of the insulating member 24 other than the boss 243. It is understood that when the insulating member 24 includes the above-mentioned member main body 242, the main body of the insulating member 24 is the above-mentioned member main body 242.

[0094] Since the accommodating space 24b can accommodate the entire support member 25, and a second exhaust channel 25a is provided on the support member 25, the dimension of the support member 25 in the normal direction of the wall portion 22a facing the side of the support member 25 is generally larger than the thickness of the main body of the insulating member 24. The solution provided in this embodiment can make the thickness of the main body of the insulating member 24 smaller, which is convenient for the lightweight design of the battery cell 20.

[0095] In some embodiments, the boss 243 is located at an end and / or a middle portion of the insulating member 24 in the length direction X.

[0096] The insulating member 24 is generally a three-dimensional structure with a certain length, width, and height. The length direction X of the insulating member 24 is the extending direction of the long side of the insulating member 24.

[0097] The boss 243 is located at the end and / or middle of the length direction of the insulating member 24, including at least the following situations: the boss 243 is only located at the end of the length direction of the insulating member 24; the second, the boss 243 is only located in the middle of the length direction of the insulating member 24; the third, the boss 243 is provided at the end of the length direction of the insulating member 24, and the boss 243 is also provided in the middle of the length direction of the insulating member 24. It can be understood that when the boss 243 is provided at the end of the length direction of the insulating member 24, the boss 243 can be provided one or more, such as the boss 243 is provided at both ends of the length direction of the insulating member 24. No matter which setting method is used, it will not affect the installation of the pole ear 23a in the electrode assembly 23.

[0098] In some embodiments, the light-transmitting portion 241 is disposed on a side wall of the accommodating space 24b.

[0099] The accommodating space 24b is generally surrounded by a plurality of side walls.

[0100] Since the support member 25 is disposed in the accommodation space 24b, the light-transmitting portion 241 is disposed on the side wall of the accommodation space 24b, so that the light-transmitting portion 241 is close to the support member 25, making it easy to observe whether the support member 25 is located in the accommodation space 24b.

[0101] like Fig.10 As shown, in some embodiments, the height H1 of the light-transmissive portion 241 is greater than 0.5 mm and less than or equal to the height H2 of the insulating member.

[0102] The height H1 of the light-transmitting portion 241 is the dimension of the light-transmitting portion 241 in the depth direction of the accommodation space 24b. The height H2 of the insulating member is also the dimension of the insulating member in the depth direction of the accommodation space 24b.

[0103] The height H1 of the light-transmitting portion 241 is greater than 0.5 mm and less than or equal to the height H2 of the insulating member, which makes it easy to observe whether the supporting member 25 is installed through the light-transmitting portion 241 and ensures that the height H1 of the light-transmitting portion 241 does not exceed the height H2 of the insulating member, thereby facilitating the preparation of the light-transmitting portion 241.

[0104] In some embodiments, the height H1 of the light-transmissive portion 241 is 0.5 mm-10 mm.

[0105] When the height H1 of the light-transmitting portion 241 is 0.5mm-10mm, it is convenient to observe whether the supporting member 25 is installed through the light-transmitting portion 241, and the height H1 of the light-transmitting portion 241 does not exceed the accommodating space 24b, which facilitates the preparation of the light-transmitting portion 241 when the light-transmitting portion 241 includes the above-mentioned through portion.

[0106] In some embodiments, the height H1 of the light-transmissive portion 241 is 0.5 mm-4 mm.

[0107] When the height H1 of the light-transmitting portion 241 is 0.5mm-4mm, it is convenient to observe whether the supporting member 25 is installed through the light-transmitting portion 241, and there is a certain distance between the light-transmitting portion 241 and the bottom surface of the boss 243, so that when the light-transmitting portion 241 includes the above-mentioned through portion, the setting position of the light-transmitting portion 241 will not have a significant impact on the supporting strength of the insulating member 24.

[0108] like Fig.11 As shown, in some embodiments, the battery cell 20 further includes an insulating film 26 , which is coated on the outside of the electrode assembly 23 , and the insulating film 26 is connected to the insulating member 24 via a connecting portion 26 a .

[0109] The insulating film 26 can be made of mylar, or other insulating materials according to the use requirements. Mylar refers to a tough polyester polymer.

[0110] The connecting portion 26a is generally a connecting structure formed when the insulating film 26 and the insulating component 24 are hot-melt welded. It can also include both the above-mentioned connecting structure and other structures, such as a sealant connecting the above-mentioned connecting structure and the insulating component 24, etc. The specific structure can be determined according to the needs of use.

[0111] The provision of the insulating film 26 can further reduce the risk of electrical connection between the electrode assembly 23 and the housing 20 ′, thereby improving the safety of the battery cell 20 .

[0112] In some embodiments, the connecting portion 26 a and the light-transmitting portion 241 are staggered.

[0113] The staggered arrangement of the connecting portion 26a and the light-transmitting portion 241 means that the two are respectively located in different areas of the component body 242. In this way, the arrangement of the connecting portion 26a and the light-transmitting portion 241 does not affect each other, which is convenient for the detection of missing installation of the supporting component 25 and makes the connection between the insulating film 26 and the insulating component 24 stable.

[0114] In some embodiments, the connection portion 26 a is located on a side of the light-transmitting portion 241 close to the electrode assembly 23 .

[0115] In this way, when the light-transmitting portion 241 includes the through portion, the through portion can be located outside the cavity surrounded by the insulating film 26 and the insulating member 24, so that the electrode assembly 23 is located in the cavity with good insulation performance, which can improve the safety of the battery cell 20 to a certain extent.

[0116] In some embodiments, a distance H3 between the connecting portion 26 a and the light-transmitting portion 241 is greater than or equal to 0.5 mm.

[0117] In this way, even if there are processing errors, the connecting portion 26a and the light-transmitting portion 241 can still be spaced apart.

[0118] In some embodiments, the support member 25 is connected to the wall portion 22a.

[0119] The support member 25 and the wall portion 22a may be connected by welding, integral molding, or the like.

[0120] In this way, after the insulating member 24 is melted, the position of the supporting member 25 will not change, so that it can still be supported between the wall portion 22a and the main body 23b of the electrode assembly 23 to ensure the exhaust effect of the second exhaust channel 25a.

[0121] like Fig.12 As shown, in some embodiments, the support member 25 includes a first support portion 251 and a second support portion 252. The first support portion 251 is connected to the wall portion 22a. The second support portion 252 is disposed between the first support portion 251 and the insulating member 24 and is connected to the first support portion 251. The second support portion 252 and the first support portion 251 form a second exhaust channel 25a.

[0122] The first support portion 251 and the second support portion 252 are both part of the support member 25, wherein the first support portion 251 is the portion of the support member 25 used to connect with the wall portion 22a, and the second support portion 252 is the portion of the support member 25 that does not contact the wall portion 22a and is located at the first support portion 251 away from the wall portion 22a.

[0123] The first support portion 251 and the second support portion 252 may each consist of one component, such as a sheet or a plate, or may each consist of multiple components, such as two spaced-apart sheets or plates, etc., depending on the usage requirements.

[0124] The first support portion 251 and the second support portion 252 may be integrally formed or may be two separately prepared components, which may be connected by welding, plugging, or the like.

[0125] The supporting member 25 adopts the structure provided in this embodiment, which is simple in structure and easy to process.

[0126] like Fig.12 As shown, in some embodiments, the second support portion 252 includes a first sheet 2521 and a second sheet 2522. The first sheet 2521 is disposed opposite to the first support portion 251. The second sheet 2522 connects the first sheet 2521 and the first support portion 251.

[0127] The first sheet 2521 and the second sheet 2522 are respectively a part of the second supporting portion 252 , and the two may be integrally formed, or may be two separately prepared sheets connected by welding, plugging, or the like.

[0128] The second supporting portion 252 adopts the structure provided in this embodiment, which has a simple structure and is easy to process.

[0129] In some embodiments, the second sheet 2522 and the first sheet 2521 can be deformed under the action of an external force to enclose an exhaust channel with a triangular cross-section together with at least a portion of the first support portion 251 .

[0130] In this embodiment, the second sheet 2522 can be tilted toward the side where the first support portion 251 is located under the action of the upward thrust, so that the first sheet 2521 and at least part of the first support portion 251 form an exhaust passage with a triangular cross section. It can be understood that the above triangle can be a closed triangle or a triangle with an opening. The triangle with an opening means that the second sheet 2522 is not in contact with the first support portion 251, and there is a gap between the two to form an opening.

[0131] By adopting the solution provided in this embodiment, in the case of thermal runaway, when the electrode assembly 23 moves toward the wall portion 22a, the second sheet 2522 will not fit into the first support portion 251 to squeeze the second exhaust channel 25a away. Instead, the first sheet 2521, the second sheet 2522 and the first support portion 251 will form an exhaust channel with a triangular cross-section, thereby achieving stable support for the electrode assembly 23 and ensuring that the second exhaust channel 25a still exists. This can improve the safety of the use of the battery cell 20 in the case of thermal runaway to a certain extent.

[0132] In some embodiments, the second sheet 2522 and the first sheet 2521 are integrally formed, so that the connection structure between the second sheet 2522 and the first sheet 2521 is stable.

[0133] like Fig.12 As shown, in some embodiments, two second support portions 252 are provided, and the two second support portions 252 are spaced apart and disposed at two ends of the first support portion 251 .

[0134] The interval arrangement means that there is a certain interval between the two second support parts 252. The two ends of the first support part 251 are respectively arranged at the two ends of the first support part 251 in the length direction.

[0135] By adopting the structure provided in this embodiment, the above-mentioned opening can be formed between the two second supporting portions 252 to facilitate welding of the supporting member 25 and the wall portion 22a.

[0136] In some embodiments, support member 25 comprises a metal member.

[0137] The structure provided in this embodiment makes the supporting member 25 have a stable structure, a strong supporting strength and a high melting point.

[0138] In some embodiments, support member 25 is an integrally formed structure.

[0139] In this embodiment, the support member 25 can be manufactured by an integral forming process such as casting, molding, and bending.

[0140] The solution provided in this embodiment is adopted to ensure that the structure of the supporting member 25 is stable.

[0141] In some embodiments, the wall portion 22 a is an end cover 21 of the housing 20 ′, and the insulating member 24 is located on the top of the electrode assembly 23 .

[0142] The insulating member 24 in this embodiment may be made of plastic material, generally referred to as lower plastic.

[0143] The solution provided in this embodiment is suitable for the battery cell 20 in which the pressure relief mechanism 22b is arranged on the top of the housing 20'.

[0144] In some other embodiments, the wall portion 22a is a bottom plate of the housing 20 ′. The insulating member 24 is located at the bottom of the electrode assembly 23 and is used to support the electrode assembly 23 .

[0145] In this embodiment, the insulating component 24 may be a bottom support plate 28 located at the bottom of the electrode assembly 23 .

[0146] The solution provided in this embodiment is suitable for the battery cell 20 in which the pressure relief mechanism 22b is arranged on the bottom plate of the housing 20'.

[0147] According to some embodiments of the present application, the present application also provides a battery, which includes the battery cell provided by any of the above embodiments.

[0148] The battery provided in the embodiments of the present application, including the battery cell provided in any of the above embodiments, can detect whether the supporting member is missing.

[0149] According to some embodiments of the present application, the present application further provides an electrical device, which includes the battery provided by any of the above embodiments.

[0150] The power-consuming device may be any of the aforementioned devices or systems using batteries.

[0151] The electrical device provided in the embodiment of the present application, including the battery provided in any of the above embodiments, can detect whether the supporting member is missing.

[0152] Please refer to Figures 3 to 12 As shown, the embodiment of the present application embodies a battery cell 20. The battery cell 20 includes a shell 20', an electrode assembly 23, an insulating member 24 and a support member 25. The shell 20' includes a wall portion 22a. The electrode assembly 23 is accommodated in the shell 20'. The insulating member 24 is arranged on the side of the wall portion 22a facing the electrode assembly 23, and a receiving space 24b is provided on the insulating member 24. The support member 25 is arranged in the receiving space 24b. Among them, the insulating member 24 includes a light-transmitting portion 241. At least a portion of the light-transmitting portion 241 is arranged opposite to at least a portion of the support member 25.

[0153] In some embodiments, the insulating member 24 further includes a member body 242, and the light-transmitting portion 241 and the accommodating space 24b are both disposed on the member body 242. The light-transmitting portion 241 includes a through portion connecting the accommodating space 24b and the external space. The through portion may be a through hole, a notch, a tube, etc. connecting the accommodating space 24b and the external space. In other embodiments, the light-transmitting portion 241 includes a light-transmitting material.

[0154] The side of the insulating member 24 facing the electrode assembly 23 forms a boss 243, and the side of the boss 243 away from the electrode assembly 23 forms a receiving space 24b. There are two bosses 243, and the two bosses 243 are respectively arranged at both ends of the length direction X of the insulating member 24.

[0155] The light-transmitting portion 241 is disposed on the first side wall 24b1 of the accommodation space 24b, and the first side wall 24b1 is a side wall of the side wall surrounding the accommodation space 24b that is away from the other boss 243. Since the tab of the electrode assembly 23 is generally disposed between the two bosses 243, the light-transmitting portion 241 is disposed on the first side wall 24b1. When the light-transmitting portion 241 includes the above-mentioned through portion, the electrode assembly 23 is not easy to achieve electrical connection with the housing 20' through the light-transmitting portion 241, the support member 25, etc., which can provide safety in the use of the battery cell 20 to a certain extent.

[0156] The height H1 of the light-transmitting portion 241 is greater than 0.5 mm and less than or equal to the height H2 of the insulating member. For example, the height H1 of the light-transmitting portion 241 is 0.5 mm-10 mm, or the height H1 of the light-transmitting portion 241 is 0.5 mm-4 mm. H2 is between 1 mm-10 mm, preferably between 1 mm-5 mm.

[0157] The battery cell 20 further includes an insulating film 26, which is coated on the outside of the electrode assembly 23 and connected to the boss 243 via a connecting portion 26a. The connecting portion 26a is located on a side of the light-transmitting portion 241 close to the electrode assembly 23. The spacing H3 between the connecting portion 26a and the light-transmitting portion 241 is greater than or equal to 0.5 mm.

[0158] The support member 25 is connected to the wall portion 22a. The support member 25 is an integrally formed metal member.

[0159] The support member 25 includes a first support portion 251 and a second support portion 252. The first support portion 251 is connected to the wall portion 22a. The second support portion 252 is disposed between the first support portion 251 and the insulating member 24, and is connected to the first support portion 251. The second support portion 252 and the first support portion 251 enclose a second exhaust passage 25a. The second support portion 252 includes a first sheet 2521 and a second sheet 2522. The first sheet 2521 is disposed opposite to the first support portion 251. The second sheet 2522 connects the first sheet 2521 and the first support portion 251. The second sheet 2522 and the first sheet 2521 can be deformed under the action of an external force to enclose an exhaust passage having a triangular cross section with at least part of the first support portion 251. Two second support portions 252 are provided, and the two second support portions 252 are disposed at intervals and are disposed at both ends of the first support portion 251.

[0160] The wall portion 22a is the end cover 21 of the housing 20'. The insulating member 24 is located on the top of the electrode assembly 23 and is made of lower plastic.

[0161] In the related art, the support member 25 is completely wrapped inside the insulating member 24. In actual engineering applications, it is difficult to identify whether the support member 25 is missing.

[0162] When assembling the battery cell 20 provided in the embodiment of the present application, the support member 25 can be first installed on the end cover 21 by welding, bonding or clamping, and then the insulating member 24 and the end cover 21 can be assembled together, so that the support member 25 is just located on the boss 243 of the insulating member 24, and does not occupy the installation space of the electrode assembly 23.

[0163] The light-transmitting portion 241 can be obtained by opening a hole on the side wall of the boss 243, and the cross-section of the hole can be square, circular, track-shaped, elliptical, triangular, rhombus-shaped, etc. The hole can be one hole, or multiple discontinuous holes. No matter how the hole is opened, as long as the support member 25 can be seen through the hole. The hole can be on the left side of the boss 243, or on the right side, or on both sides. In order to ensure a certain insulation effect and avoid overlapping of the pole ear 23a with the support member 25, it is preferred that the above-mentioned hole is opened on the outside of the boss 243 (that is, close to the side of the shell 20', that is, the side away from the pole ear 23a), and the inner side of the boss 243 is not opened.

[0164] In order to ensure that the hot melt welding mark of the insulating film 26 is not affected, the opening area does not overlap with the hot melt area, that is, the transparent portion 241 does not overlap with the above-mentioned connecting portion 26a. The spacing H3 between the transparent portion 241 and the connecting portion 26a can be greater than or equal to 0.5mm, so that the two can not interfere with each other due to process fluctuations.

[0165] In addition to the above configuration, the insulating member 24 can also be directly made into a transparent polypropylene (PP) structure, or only the area where the accommodating space is located can be made into a transparent PP structure for observation.

[0166] Regardless of which of the above methods is adopted, the battery cell 20 provided by the present application can effectively identify whether the supporting member 25 is missing.

[0167] 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, including a wall portion; an electrode assembly, contained in the housing; An insulating member, disposed on a side of the wall portion facing the electrode assembly, and having a receiving space; as well as A supporting member, disposed in the accommodation space; The insulating member includes a light-transmitting portion, and at least a portion of the light-transmitting portion is disposed opposite to at least a portion of the supporting member.

2. The battery cell according to claim 1, characterized in that: The light-transmitting portion includes a through portion communicating the accommodating space with an external space.

3. The battery cell according to claim 1, characterized in that: The light-transmitting portion includes a light-transmitting material.

4. The battery cell according to any one of claims 1 to 3, characterized in that: A boss is formed on a side of the insulating member facing the electrode assembly, and a side of the boss facing away from the electrode assembly forms the accommodation space.

5. The battery cell according to claim 4, characterized in that: The boss is located at an end and / or a middle portion of the insulating component in the length direction.

6. The battery cell according to any one of claims 1 to 5, characterized in that: The light-transmitting portion is arranged on a side wall of the accommodating space.

7. The battery cell according to any one of claims 1 to 6, characterized in that: The height of the light-transmitting portion is greater than 0.5 mm and less than or equal to the height of the insulating member.

8. The battery cell according to any one of claims 1 to 7, characterized in that: The height of the light-transmitting portion is 0.5 mm-10 mm.

9. The battery cell according to any one of claims 1 to 8, characterized in that: The height of the light-transmitting portion is 0.5 mm-4 mm.

10. The battery cell according to any one of claims 1 to 9, characterized in that: The battery cell further includes an insulating film, the insulating film is coated on the outer side of the electrode assembly, and the insulating film is connected to the insulating member through a connecting portion.

11. The battery cell according to claim 10, characterized in that: The connecting portion and the light-transmitting portion are arranged staggered.

12. The battery cell according to claim 10, characterized in that: The connecting portion is located on a side of the light-transmitting portion close to the electrode assembly.

13. The battery cell according to claim 12, characterized in that: The distance between the connecting portion and the light-transmitting portion is greater than or equal to 0.5 mm.

14. The battery cell according to any one of claims 1 to 13, characterized in that: The supporting member is connected to the wall portion.

15. The battery cell according to any one of claims 1 to 14, characterized in that: The supporting member comprises: A first supporting portion connected to the wall portion; and The second support portion is disposed between the first support portion and the insulating component and connected to the first support portion. The second support portion and the first support portion form an exhaust passage.

16. The battery cell according to claim 15, characterized in that: The second supporting portion comprises: A first sheet body, disposed opposite to the first supporting portion; and The second sheet body connects the first sheet body and the first supporting part.

17. The battery cell according to claim 16, characterized in that: The second sheet and the first sheet can be deformed under the action of an external force to enclose an exhaust channel with a triangular cross section together with at least a portion of the first support portion.

18. The battery cell according to claim 16 or 17, characterized in that: The second sheet body is integrally formed with the first sheet body.

19. The battery cell according to any one of claims 1 to 18, characterized in that: The wall portion is an end cover of the housing, and the insulating member is located on the top of the electrode assembly.

20. The battery cell according to any one of claims 1 to 18, characterized in that: The wall portion is a bottom plate of the housing, and the insulating member is located at the bottom of the electrode assembly to support the electrode assembly.

21. A battery, characterized in that: A battery cell comprising the battery cell according to any one of claims 1 to 20.

22. An electrical device, characterized in that: Comprising the battery of claim 21.

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