Battery cell, battery apparatus and electrical apparatus
Patent Information
- Application Number
- PCT/CN2025/132968
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Priority Date
- 2025-02-19
- Filing Date
- 2025-11-06
- Publication Date
- 2026-08-27
Smart Images
Figure CN2025132968_27082026_PF_FP_ABST
Abstract
Description
Battery cells, battery packs and electrical devices
[0001] This application claims priority to Chinese Patent Application No. 202520268291.6, filed on February 19, 2025, entitled “Battery Cell, Battery Device and Power Consumption Device”, which is incorporated herein by reference in its entirety. Technical Field
[0002] This application relates to the field of battery structure technology, and in particular provides a battery cell, a battery device, and an electrical device. Background Technology
[0003] With the development of new energy sources, more and more fields are adopting new energy sources as power sources. Due to their advantages such as high energy density, rechargeability, safety, and environmental friendliness, battery devices are widely used in new energy vehicles, consumer electronics, energy storage systems, and other fields.
[0004] In related technologies, battery devices include multiple battery cells. Each battery cell includes a housing, an end cap, an electrode assembly disposed inside the housing, an insulating component disposed on the inner side of the end cap, and an insulating film for covering the electrode assembly. The insulating film is fixedly connected to the side wall of the insulating component by heat fusion. However, as the volumetric energy density of battery cells increases, the thickness of the insulating component on the end cap becomes thinner, resulting in a smaller heat-fusible area between the insulating film and the insulating component. This weakens the connection strength between the insulating film and the insulating component, increasing the probability of the insulating film detaching.
[0005] Application content
[0006] The purpose of this application is to provide a battery cell, a battery device, and an electrical device, which aims to solve the problem that the connection strength between the insulating film and the insulating component is weakened due to the small heat-fusible area of the insulating component and the insulating film.
[0007] To achieve the above objectives, the technical solution adopted in the embodiments of this application is as follows:
[0008] In a first aspect, embodiments of this application provide a battery cell including a casing, an electrode assembly, an insulating film, and an insulating member. The casing has an internal cavity and a first wall. The electrode assembly is housed within the cavity, and the insulating film covers at least a portion of the electrode assembly. The insulating member is disposed on the inner sidewall of the first wall and has an outer peripheral wall circumferentially arranged around the thickness direction of the first wall. The insulating film is connected to the outer peripheral wall. A clearance groove is provided on the inner sidewall of the first wall, and a portion of the insulating member is disposed within the clearance groove so that a portion of the outer peripheral wall is located within the clearance groove.
[0009] The beneficial effects of the embodiments of this application are as follows: The battery cell provided in this application provides a relief groove on the inner side wall of the first wall, and a portion of the insulating component is disposed in the relief groove so that a portion of the outer peripheral wall is located in the relief groove. As a result, the dimension of the outer peripheral wall of the insulating component along the thickness direction of the first wall is increased, the connection area between the insulating film and the outer peripheral wall is also increased, and the connection strength between the insulating film and the outer peripheral wall of the insulating component is effectively improved. Therefore, the probability of the insulating film falling off is reduced, and the reliability of the battery cell is stronger.
[0010] In some embodiments, the clearance groove is disposed on the inner side wall surface of the first wall; in the thickness direction of the first wall, the projection position of the outer peripheral wall is within the range of the clearance groove.
[0011] By adopting the above technical solution, the entire outer peripheral wall of the insulating component can extend into the clearance groove to increase its size, thereby further increasing the connection area between the outer peripheral wall and the insulating component, and further improving the connection strength between the outer peripheral wall and the insulating component.
[0012] In some embodiments, the first wall has a first direction and a second direction that are both perpendicular to the thickness direction; in the first direction, at least one end of the inner sidewall of the first wall is provided with a clearance groove; and / or, in the second direction, at least one end of the inner sidewall of the first wall is provided with a clearance groove.
[0013] By adopting the above technical solution, the clearance groove can be formed at the opposite ends of the first wall in the first direction, so that the insulating film can form a large connection area with the outer peripheral wall of the insulating member at the opposite ends in the first direction; and / or, the clearance groove can be formed at the opposite ends of the first wall in the second direction, so that the insulating film can form a large connection area with the outer peripheral wall of the insulating member at the opposite ends in the second direction; thus, the connection strength between the insulating film and the insulating member can be further improved.
[0014] In some embodiments, in a first direction, the first wall includes a middle section and side sections connected to opposite ends of the middle section, at least a portion of the middle section protruding outward from the receiving cavity, an insulating member connecting the middle section and the side sections; and a clearance groove is formed on the inner wall surface of the side sections.
[0015] By adopting the above technical solution, when the first wall includes an outwardly convex middle section and side sections located at opposite ends of the middle section along the first direction, since the middle section is outwardly convex, the thickness of the insulating component at the middle section can be set to be relatively thick, while the thickness of the insulating component at the side sections is relatively thin. Therefore, the clearance groove is opened on the side section, so that the outer peripheral wall of the side section can extend into the clearance groove to increase the size of the outer peripheral wall along the thickness direction of the first wall. This allows the insulating film to form a large connection area when connecting the outer peripheral wall of the insulating component located on the side section, thereby further improving the connection strength between the insulating component and the insulating film.
[0016] In some embodiments, the clearance groove includes a first groove and a second groove, the first groove being formed at one end of the side section away from the middle section in a first direction, and the second groove being formed at opposite ends of the side section in a second direction; wherein the first direction is perpendicular to the second direction.
[0017] By adopting the above technical solution, by opening a first groove at both ends in the first direction and a second groove at both ends in the second direction perpendicular to the first direction, the insulating component has a larger outer peripheral wall in both the first and second directions perpendicular to the first direction. The connection strength between the insulating film and the insulating component in both the first and second directions perpendicular to the first direction is improved, thereby improving the connection stability between the insulating film and the insulating component.
[0018] In some embodiments, in the same side segment, the first groove is connected to two second grooves.
[0019] By adopting the above technical solution, the outer peripheral wall of the insulating component has a larger size at the connection between the first and second grooves, thereby improving the connection stability between the insulating film and the insulating component.
[0020] In some embodiments, the housing includes a shell, the interior of which forms a receiving cavity with an opening, a first wall sealing the opening; and a clearance groove communicating with the outside in a direction perpendicular to the thickness direction of the first wall.
[0021] By adopting the above technical solution, the clearance groove is connected to the outside in the direction perpendicular to the thickness direction of the first wall. That is, there is no wall obstruction on the outward side of the clearance groove, and the connection operation between the insulating film and the outer peripheral wall located at the clearance groove is more convenient.
[0022] In some embodiments, the insulating element abuts against the bottom wall of the clearance groove.
[0023] By adopting the above technical solution, the outer peripheral wall of the insulating component has a larger size, thereby increasing the connection area between the insulating component and the insulating film and further improving the connection strength between the insulating component and the insulating film.
[0024] In some embodiments, the thickness of the first wall is H, and the depth of the clearance groove is D, wherein 0.05H≤D≤0.5H.
[0025] By adopting the above technical solution, the depth D of the clearance groove is limited to 5% or more and less than or equal to 50% of the thickness H of the first wall. This ensures that the clearance groove has sufficient depth to increase the size of the peripheral sidewall of the insulating component, and avoids the problem of the clearance groove being too deep and affecting the structural strength of the first wall.
[0026] In some embodiments, a welding area is provided at the outer edge of the first wall, and the distance between the insulating element and the welding area is M, where 0.8mm≤M≤3mm.
[0027] By adopting the above technical solution, the distance between the welding area and the outer peripheral wall of the insulating component is set to be greater than or equal to 0.88 mm and less than or equal to 3 mm, so that there is sufficient gap between the insulating component and the welding area to reduce the impact on the insulating component and its outer peripheral wall during the welding assembly of the first wall.
[0028] In some embodiments, 1mm ≤ M ≤ 2mm.
[0029] By adopting the above technical solution, the distance between the welding area and the outer peripheral wall of the insulating component is further limited to greater than or equal to 1 mm and less than or equal to 2 mm, so as to further reduce the impact on the insulating component and its outer peripheral wall during the welding assembly of the first wall.
[0030] In some embodiments, the distance between the insulating film and the first wall is N, where 0 mm < N ≤ 2 mm.
[0031] By adopting the above technical solution, the distance between the insulating film and the first wall is limited to greater than 0 and less than or equal to 2 mm, so that a gap is formed between the insulating component and the first wall, thereby reducing the influence of the first wall on the connection operation between the insulating film and the insulating component.
[0032] In some embodiments, 0.5mm ≤ N ≤ 1.5mm.
[0033] By adopting the above technical solution, the distance between the insulating film and the first wall is further limited to greater than or equal to 0.5 mm and less than or equal to 1.5 mm, so as to further reduce the influence of the first wall on the connection operation between the insulating film and the insulating component.
[0034] In some embodiments, in the thickness direction of the first wall, at least a portion of the outer peripheral wall of the insulating member has a dimension greater than or equal to 4 mm.
[0035] By adopting the above technical solution, by limiting the dimension of at least part of the outer peripheral wall of the insulating member along the thickness direction of the first wall to be greater than or equal to 4 mm, the connection strength between the insulating film and the outer peripheral wall of the insulating member can be guaranteed, thereby reducing the probability of the insulating film falling off.
[0036] Secondly, embodiments of this application also provide a battery device, including a housing and a battery cell as described above, wherein the battery cell is housed within the housing.
[0037] The beneficial effects of the embodiments of this application are as follows: The battery device provided in the embodiments of this application includes the above-mentioned battery cell. When the connection strength of the insulating film and insulating component of the battery cell is better, the reliability of the battery device is better.
[0038] Thirdly, embodiments of this application also provide an electrical device, including a battery cell as described above, and / or a battery device as described above, wherein the battery cell and / or battery device are used to provide electrical energy.
[0039] The beneficial effects of the embodiments of this application are as follows: The electrical device provided in the embodiments of this application includes the above-mentioned battery cell and / or battery device, thereby improving the reliability of the electrical device. Attached Figure Description
[0040] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0041] Figure 1 is a structural schematic diagram of the vehicle provided in an embodiment of this application;
[0042] Figure 2 is an exploded view of the battery device provided in an embodiment of this application;
[0043] Figure 3 is a schematic diagram of the exploded structure of the first type of battery cell provided in the embodiment of this application;
[0044] Figure 4 is a schematic diagram of the structure of the inner wall of the first wall of the first type of battery cell provided in the embodiment of this application;
[0045] Figure 5 is an exploded structural diagram of the second type of battery cell provided in the embodiments of this application;
[0046] Figure 6 is a cross-sectional view of the internal structure of the second type of battery cell provided in the embodiment of this application;
[0047] Figure 7 is a magnified view of part A in Figure 6;
[0048] Figure 8 is a schematic diagram of the structure of the first wall of the second type of battery cell provided in the embodiment of this application;
[0049] Figure 9 is a magnified view of part B in Figure 8.
[0050] In the figures, the following labels are used: 1000, vehicle; 100, battery device; 200, controller; 300, motor; 10, housing; 11, first housing; 12, second housing; 20, battery cell; 210, outer casing; 210a, first wall; 21, end cap; 211, middle section; 212, side section; 21a, electrode terminal; 21b, clearance groove; 21b1, first groove; 21b2, second groove; 21c, welding area; 22, housing; 221, opening; 222, receiving cavity; 23, electrode assembly; 23a, electrode tab; 24, insulating film; 25, insulating component; 251, outer peripheral wall; X, first direction; Y, second direction; Z, thickness direction. Detailed Implementation
[0051] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.
[0052] In the description of this application, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.
[0053] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.
[0054] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.
[0055] Currently, judging from market trends, the application of power batteries is becoming increasingly widespread. Power batteries are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but also extensively used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. With the continuous expansion of power battery applications, market demand is also constantly increasing.
[0056] In related technologies, battery devices include multiple battery cells. Each battery cell includes a housing, an end cap, an electrode assembly disposed inside the housing, an insulating component disposed on the inner side of the end cap, and an insulating film for covering the electrode assembly. The insulating film is fixedly connected to the side wall of the insulating component by heat fusion. However, as the volumetric energy density of battery cells increases, the thickness of the insulating component on the end cap becomes thinner, resulting in a smaller heat-fusible area between the insulating film and the insulating component. This weakens the connection strength between the insulating film and the insulating component, increasing the probability of the insulating film detaching.
[0057] Based on the above considerations, in order to solve the problem that the small heat-fusible area between the insulating component and the insulating film leads to a weakened connection strength between the insulating film and the insulating component, a battery cell is designed. By forming a relief groove on the inner side wall of the first wall and placing part of the insulating component in the relief groove, so that part of the outer peripheral wall is located in the relief groove, the dimension of the outer peripheral wall of the insulating component along the thickness direction of the first wall is increased, the connection area between the insulating film and the outer peripheral wall is also increased, thereby effectively improving the connection strength between the insulating film and the outer peripheral wall, reducing the probability of the insulating film falling off, and making the battery cell more reliable.
[0058] The battery cells disclosed in this application can be used in electrical devices that use battery devices as a power source or in various energy storage systems that use battery devices as energy storage elements. Electrical devices can be, but are not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.
[0059] For ease of explanation, the following embodiments will be described using a vehicle 1000 as an example of an electrical device according to an embodiment of this application.
[0060] Please refer to Figure 1, which is a structural schematic diagram of a vehicle 1000 provided in some embodiments of this application. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device 100 is installed inside the vehicle 1000, and the battery device 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000; for example, the battery device 100 can serve as the operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle 1000 during startup, navigation, and driving.
[0061] In some embodiments of this application, the battery device 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.
[0062] Please refer to Figure 2, which is an exploded view of a battery device 100 provided in some embodiments of this application. The battery device 100 mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly may include multiple battery cells 20, which are connected in series, parallel, or mixed connection via a busbar.
[0063] In some embodiments, the battery cell assembly is typically formed by arranging a plurality of battery cells 20.
[0064] As an example, the battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells 20 into a single module. As an example, the battery module can be formed by bundling multiple battery cells 20 together with cable ties.
[0065] In some embodiments, the battery device may be a battery pack, which includes a housing 10 and one or more battery cell assemblies housed in the housing 10.
[0066] As an example, the battery cell assembly can be a battery module, and the battery cell assembly can be housed in the housing 10 by fixing the battery module in the housing 10.
[0067] As an example, the battery cell assembly can also be housed in the housing 10 by directly fixing multiple battery cells 20 to the housing 10.
[0068] As an example, the housing 10 may include a first housing 11 and a second housing 12. The first housing 11 and the second housing 12 are fastened together to form a closed space inside the housing 10 to house the battery cell assembly. Here, "closed" refers to covering or closing, and can be either sealed or unsealed. The first housing 11 may be a top cover or a bottom plate.
[0069] As an example, the housing 10 may include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are respectively connected to the frame, so that the interior of the housing 10 forms an enclosed space to accommodate the battery cell assembly.
[0070] In some embodiments, the housing 10 may be part of the chassis structure of the vehicle 1000. For example, a portion of the housing 10 may be at least a portion of the floor of the vehicle 1000, or a portion of the housing 10 may be at least a portion of the crossbeams and longitudinal beams of the vehicle 1000.
[0071] The technical solutions described in the embodiments of this application are applicable to various electrical devices that use battery cells 20, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles, ships and spacecraft, etc. For example, spacecraft include airplanes, rockets, space shuttles and spacecraft.
[0072] In this embodiment of the application, the battery cell 20 can be a secondary battery, which refers to a battery cell 20 that can be used again after the battery cell has been discharged by recharging to activate the active materials.
[0073] The battery cell 20 can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments of this application are not limited to this.
[0074] Please refer to Figure 3, which is an exploded structural diagram of a battery cell 20 provided in some embodiments of this application. A battery cell 20 refers to the smallest unit constituting a battery device 100. As shown in Figure 3, the battery cell 20 includes a housing 210, electrode assemblies 23, and other functional components.
[0075] The outer casing 210 can refer to a component used to house the electrode assembly 23. In some embodiments, the outer casing 210 may include an end cap 21 and a housing 22. The end cap 21 is a component that closes onto the opening 221 of the housing 22 to isolate the internal environment of the battery cell 20 from the external environment. The shape of the end cap 21 may be adapted to the shape of the housing 22 to fit it; for example, the end cap 21 may be, but is not limited to, square, rectangular, circular, or other configurations. Optionally, the end cap 21 may be made of a material with a certain hardness and strength (such as aluminum alloy), so that the end cap 21 is less prone to deformation under pressure and impact, enabling the battery cell 20 to have higher structural strength and improved reliability. Functional components such as electrode terminals 21a may be provided on the end cap 21. The electrode terminals 21a can be used for electrical connection with the electrode assembly 23 to output or input electrical energy to the battery cell 20. In some embodiments, the end cap 21 may also be provided with a pressure relief mechanism for releasing internal pressure when the internal pressure or temperature of the battery cell 20 reaches a threshold. The end cap 21 can be made of various materials, such as, but not limited to, copper, iron, aluminum, stainless steel, aluminum alloy, and plastic. In some embodiments, an insulating element may be provided on the inner side of the end cap 21. This insulating element can be used to isolate the electrical connection components within the housing 22 from the end cap 21 to reduce the risk of short circuits. For example, the insulating element may be made of plastic, rubber, etc.
[0076] The housing 22 is a component used to cooperate with the end cap 21 to form the internal environment of the battery cell 20. This internal environment can accommodate the electrode assembly 23, electrolyte, and other components. The housing 22 and the end cap 21 can be independent components. An opening can be provided on the housing 22, and the end cap 21 closes the opening to form the internal environment of the battery cell 20. Alternatively, the end cap 21 and the housing 22 can be integrated. Specifically, the end cap 21 and the housing 22 can form a common connecting surface before other components are inserted into the housing. When it is necessary to encapsulate the interior of the housing 22, the end cap 21 closes the housing 22. The housing 22 can be of various shapes and sizes, such as cuboid, cylindrical, hexagonal prism, etc. Specifically, the shape of the housing 22 can be determined according to the specific shape and size of the electrode assembly 23. The housing 22 can be made of various materials, such as, but not limited to, copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.
[0077] Electrode assembly 23 is the component in the battery cell 20 where electrochemical reactions occur. The casing 22 may contain one or more electrode assemblies 23. The electrode assembly 23 is mainly formed by winding or stacking positive and negative electrode sheets, and typically a separator is provided between the positive and negative electrode sheets. The portions of the positive and negative electrode sheets containing active material constitute the main body of the electrode assembly 23, while the portions of the positive and negative electrode sheets without active material each constitute a tab 23a. The positive and negative tabs may be located together at one end of the main body or separately at both ends of the main body. During the charging and discharging process of the battery, the positive and negative active materials react with the electrolyte, and the tabs 23a connect to the electrode terminals 21a to form a current loop.
[0078] According to some embodiments of this application, referring to Figures 3 and 4, this application provides a battery cell 20, including a housing 210, an electrode assembly 23, an insulating film 24, and an insulating member 25. The housing 210 has a receiving cavity 222 formed inside, and the housing 210 includes a first wall 210a. The electrode assembly 23 is housed in the receiving cavity 222, and the insulating film 24 covers at least a portion of the electrode assembly 23. The insulating member 25 is disposed on the inner sidewall of the first wall 210a, and the insulating member 25 has an outer peripheral wall 251 circumferentially arranged around the thickness direction Z of the first wall 210a. The insulating film 24 is connected to the outer peripheral wall 251. A clearance groove 21b is provided on the inner sidewall of the first wall 210a, and a portion of the insulating member 25 is disposed in the clearance groove 21b so that a portion of the outer peripheral wall 251 is located in the clearance groove 21b.
[0079] The insulating film 24 is an insulating film structure that wraps around the surface of the electrode assembly 23 and insulatingly separates the electrode assembly 23 from the housing 210 to reduce the probability of leakage in the electrode assembly 23. Exemplarily, the insulating film 24 can be, but is not limited to, a plastic film made of polyester film or similar structures.
[0080] The insulating film 24 can be wrapped around the surface of the electrode assembly 23 and adhere to the surface of the electrode assembly 23; or, the insulating film 24 can wrap around the electrode assembly 23 and form a gap with part of the surface of the electrode assembly 23.
[0081] The housing 210 includes a first wall 210a; the first wall 210a may refer to the side wall of the housing 210 opposite to the tab 23a of the electrode assembly 23. It should be understood that the electrode terminal 21a can be disposed on the first wall 210a and electrically connected to the tab 23a to achieve charging and discharging operation. Exemplarily, in some embodiments, the housing 210 may include an end cap 21 and a housing 22, the end cap 21 being used to cover the opening 221 of the housing 22, in which case the end cap 21 is the first wall 210a mentioned above; or, in other embodiments, when the electrode terminal 21a is disposed on the housing 22, the first wall 210a may refer to the side wall of the housing 22 where the electrode terminal 21a is disposed.
[0082] The inner wall surface of the first wall 210a is provided with a clearance groove 21b. Optionally, the clearance groove 21b may be, but is not limited to, a rectangular groove, a strip groove, an annular groove, etc. The number of clearance grooves 21b may be one, two, or more. When there are multiple clearance grooves 21b, the multiple clearance grooves 21b may be independent of each other, or at least two of the multiple clearance grooves 21b may be interconnected. For example, in some embodiments, the number of clearance grooves 21b may be one, and the clearance groove 21b may be an annular groove; or, in other embodiments, the number of clearance grooves 21b may be multiple, for example, two. The two clearance grooves 21b may be symmetrically provided on the inner wall surface of the first wall 210a, and the two clearance grooves 21b are respectively located at the outer edges of opposite ends of the inner wall surface of the first wall 210a.
[0083] The inner wall surface of the first wall 210a mentioned above refers to the side wall surface of the first wall 210a located inside the receiving cavity 222 and facing the electrode assembly 23. It should be understood that when the electrode assembly 23 is placed inside the receiving cavity 222 inside the housing 210, the side wall surface of the first wall 210a facing the electrode assembly 23 will be located inside the receiving cavity 222. Therefore, in this application, the inner wall surface of the first wall 210a refers to the side wall surface of the first wall 210a facing the electrode assembly 23 for ease of description and understanding.
[0084] An insulating element 25 is also provided on the inner wall surface of the first wall 210a. The insulating element 25 has a structure with good insulation performance and can be used to isolate the first wall 210a from electrical connection components or electrode assemblies 23 and other charged structures within the receiving cavity 222, thereby reducing the risk of short circuits. For example, the insulating element 25 can be made of plastic, rubber, or other similar materials; it can be, but is not limited to, a layer structure, a block structure, or a film structure. The insulating element 25 can be fixedly connected to the inner wall surface of the first wall 210a by means of adhesion, snap-fit connection, or locking. For example, in some embodiments, the insulating element 25 can be a plastic layer, and this plastic layer can be glued and fixed to the inner wall surface of the first wall 210a.
[0085] The insulating member 25 has an outer peripheral wall 251 circumferentially disposed around the thickness direction Z of the first wall 210a; wherein, the outer peripheral wall 251 of the insulating member 25 refers to the side wall surface formed on the outer periphery of the insulating member 25 around the thickness direction Z of the first wall 210a. It should be understood that the outer peripheral wall 251 of the insulating member 25 is intersecting with the first wall 210a; in some embodiments, the outer peripheral wall 251 and the first wall 210a may be perpendicular. An insulating film 24 is attached to the outer peripheral wall 251; the insulating film 24 is used to wrap at least a portion of the electrode assembly 23, and the insulating film 24 is attached to the outer peripheral wall 251 of the insulating member 25; thus, the insulating film 24 and the insulating member 25 can be used together to insulate the housing 210 and the electrode assembly 23. Optionally, the insulating film 24 and the outer peripheral wall 251 can be connected and fixed by means of adhesive bonding, heat fusion bonding, etc.
[0086] A portion of the insulating member 25 is disposed within the clearance groove 21b, such that a portion of the outer peripheral wall 251 is located within the clearance groove 21b. Understandably, when the portion of the insulating member 25 including the outer peripheral wall 251 is disposed within the clearance groove 21b, along the thickness direction Z of the first wall 210a, the outer peripheral wall 251 includes a portion located within the clearance groove 21b and a portion disposed outside the clearance groove 21b. Compared to a solution without a clearance groove 21b, in this embodiment, the outer peripheral wall 251 extends into the clearance groove 21b, effectively increasing the dimension of the outer peripheral wall 251 along the thickness direction Z of the first wall 210a. Therefore, when the insulating film 24 is connected to the outer peripheral wall 251, because the outer peripheral wall 251 has a larger dimension along the thickness direction Z of the first wall 210a, the connection dimension between the insulating film 24 and the outer peripheral wall 251 along the thickness direction Z of the first wall 210a is also increased.
[0087] The battery cell 20 provided in this application embodiment has an avoidance groove 21b formed on the inner sidewall of the first wall 210a, and a portion of the insulating member 25 is disposed in the avoidance groove 21b, so that a portion of the outer peripheral wall 251 is located in the avoidance groove 21b. As a result, the dimension of the outer peripheral wall 251 of the insulating member 25 along the thickness direction Z of the first wall 210a is increased, and the connection area between the insulating film 24 and the outer peripheral wall 251 is also increased. Consequently, the connection strength between the insulating film 24 and the outer peripheral wall 251 is effectively improved, thus reducing the probability of the insulating film 24 falling off and making the battery cell 20 more reliable.
[0088] Referring to Figures 3 and 4, in some embodiments, the clearance groove 21b is arranged around the inner wall surface of the first wall 210a; in the thickness direction Z of the first wall 210a, the projection position of the outer peripheral wall 251 is within the range of the clearance groove 21b.
[0089] In this embodiment, the clearance groove 21b can be an annular groove, and the clearance groove 21b is arranged around the inner wall surface of the first wall 210a; at the same time, in the thickness direction Z of the first wall 210a, the projection position of the outer peripheral wall 251 is within the range of the clearance groove 21b. Thus, the insulating member 25 is disposed on the inner wall surface of the first wall 210a, and the insulating member 25 is located within the range of the clearance groove 21b. The entire outer peripheral wall 251 of the insulating member 25 can extend into the clearance groove 21b, thereby increasing the size of the entire outer peripheral wall 251 of the insulating member 25 in the thickness direction Z of the first wall 210a.
[0090] With this configuration, the entire outer peripheral wall 251 of the insulating member 25 can extend into the clearance groove 21b to increase its size, thereby further increasing the connection area between the outer peripheral wall 251 and the insulating member 25, and further improving the connection strength between the outer peripheral wall 251 and the insulating member 25.
[0091] Referring to Figures 5 to 8, in some embodiments, the first wall 210a has a first direction X and a second direction Y, both perpendicular to the thickness direction Z; in the first direction X, at least one end of the inner wall surface of the first wall 210a is provided with a clearance groove 21b; and / or, in the second direction Y, at least one end of the inner wall surface of the first wall 210a is provided with a clearance groove 21b.
[0092] Understandably, the first direction X and the second direction Y refer to two intersecting directions perpendicular to the thickness direction Z of the first wall 210a. The first direction X can be, but is not limited to, any direction such as the width or length direction of the first wall 210a; the second direction Y can also be, but is not limited to, any direction such as the width or length direction of the first wall 210a. For example, in some embodiments, the first direction X can refer to the length direction of the first wall 210a, and the second direction Y can refer to the width direction of the first wall 210a, with the first direction X and the second direction Y being perpendicular.
[0093] In the first direction X, at least one end of the inner wall surface of the first wall 210a is provided with a clearance groove 21b; optionally, the clearance groove 21b may be provided only at one end of the inner wall surface of the first wall 210a along the first direction X; or, clearance grooves 21b may be provided at both opposite ends of the inner wall surface of the first wall 210a along the first direction X. Wherein, at least one clearance groove 21b may be provided at one end of the inner wall surface of the first wall 210a in the first direction X, for example, one, two, or more clearance grooves 21b may be provided; when there are multiple clearance grooves 21b, the multiple clearance grooves 21b may be arranged sequentially at intervals along the first direction X.
[0094] In the second direction Y, at least one end of the inner wall surface of the first wall 210a is provided with a clearance groove 21b; optionally, the clearance groove 21b may be provided only at one end of the inner wall surface of the first wall 210a along the second direction Y; or, clearance grooves 21b may be provided at both opposite ends of the inner wall surface of the first wall 210a along the second direction Y. Specifically, in the second direction Y, at least one clearance groove 21b may be provided at one end of the inner wall surface of the first wall 210a, for example, one, two, or more clearance grooves 21b may be provided; when there are multiple clearance grooves 21b, the multiple clearance grooves 21b may be arranged sequentially at intervals along the second direction Y.
[0095] For example, in some embodiments, in the first direction X, clearance grooves 21b are provided at both ends of the inner sidewall of the first wall 210a, and in the second direction Y, clearance grooves 21b are provided at both ends of the inner sidewall of the first wall 210a; wherein, the first direction X is the length direction of the first wall 210a, and the second direction Y is the width direction of the first wall 210a.
[0096] With this configuration, the clearance groove 21b can be formed at opposite ends of the first wall 210a in the first direction X, so that the insulating film 24 can form a larger connection area with the outer peripheral wall 251 of the insulating member 25 at opposite ends in the first direction X; and / or, the clearance groove 21b can be formed at opposite ends of the first wall 210a in the second direction Y, so that the insulating film 24 can form a larger connection area with the outer peripheral wall 251 of the insulating member 25 at opposite ends in the second direction Y; thus, the connection strength between the insulating film 24 and the insulating member 25 can be further improved.
[0097] Referring to Figures 5 and 8, in some embodiments, in the first direction X, the first wall 210a includes a middle section 211 and side sections 212 connected to opposite ends of the middle section 211. At least a portion of the middle section 211 protrudes outward from the receiving cavity 222. An insulating member 25 connects the middle section 211 and the side sections 212. A clearance groove 21b is formed on the inner wall surface of the side section 212.
[0098] It should be understood that the middle section 211 and the side section 212 refer to the three segments formed sequentially along the first direction X of the first wall 210a; wherein, in the first direction X, the middle section is the middle section 211, and the two sections at opposite ends of the middle section 211 are the side sections 212.
[0099] At least a portion of the intermediate section 211 protrudes outward toward the receiving cavity 222; optionally, a portion of the intermediate section 211 may protrude outward toward the receiving cavity 222, i.e., form an outward protrusion structure opposite to the electrode assembly 23; or, the entire intermediate section 211 protrudes outward toward the receiving cavity 222.
[0100] In this embodiment, the clearance groove 21b can be formed on the inner wall surface of the side section 212, so that the part of the insulating member 25 connected to the side end can extend into the clearance groove 21b to increase the size of the outer peripheral wall 251 of the insulating member 25 at that location.
[0101] With this configuration, when the first wall 210a includes an outwardly convex middle section 211 and side sections 212 located at opposite ends of the middle section 211 along the first direction X, since the middle section 211 is outwardly convex, the thickness of the insulating member 25 at the middle section 211 can be set to be relatively thick, while the thickness of the insulating member 25 at the side sections 212 is relatively thin. Therefore, the clearance groove 21b is opened on the side section 212, so that the outer peripheral wall 251 of the insulating member 25 located on the side section 212 can extend into the clearance groove 21b to increase the size of the outer peripheral wall 251 along the thickness direction Z of the first wall 210a. This allows the insulating film 24 to still form a large connection area when connecting the outer peripheral wall 251 of the insulating member 25 located on the side section 212, thereby further improving the connection strength between the insulating member 25 and the insulating film 24.
[0102] It should be understood that, in some embodiments, a clearance groove 21b may also be provided on the inner wall surface of the intermediate section 211.
[0103] Referring to Figures 5, 7, and 9, in some embodiments, the clearance groove 21b includes a first groove 21b1 and a second groove 21b2. The first groove 21b1 is formed at one end of the side section 212 away from the middle section 211 in the first direction X, and the second groove 21b2 is formed at opposite ends of the side section 212 in the second direction Y; wherein, the first direction X is perpendicular to the second direction Y.
[0104] It should be understood that the first groove 21b1 and the second groove 21b2 refer to the two recessed portions of the clearance groove 21b. Specifically, in the first direction X, the first groove 21b1 is formed on the inner wall of the side section 212 and away from one end of the intermediate section 211; in the second direction Y, the second groove 21b2 is formed at opposite ends of the inner wall of the side section 212. Thus, the insulating member 25 can extend into the corresponding first groove 21b1 and second groove 21b2 at the opposite ends of the side sections 212 of the intermediate section 211, respectively, meaning that the dimension of at least a portion of the outer peripheral wall 251 of the insulating member 25 connected to the opposite ends of the side sections 212 of the intermediate section 211 is increased.
[0105] With this configuration, by opening the first groove 21b1 at opposite ends in the first direction X and the second groove 21b2 at opposite ends in the perpendicular second direction Y, the insulating member 25 has a larger outer peripheral wall 251 in both the perpendicular first direction X and the perpendicular second direction Y. The connection strength between the insulating film 24 and the insulating member 25 in both the perpendicular first direction X and the perpendicular second direction Y is improved, resulting in better connection stability between the insulating film 24 and the insulating member 25.
[0106] Referring to Figures 5, 7 and 9, in some embodiments, in the same side segment 212, the first groove 21b1 is connected to two second grooves 21b2.
[0107] In this embodiment, the first groove 21b1 in the same side segment 212 is connected to two second grooves 21b2. As a result, the dimensions of the outer peripheral wall 251 of the insulating member 25 are increased at the first groove 21b1, the second groove 21b2, and the connection points between the first groove 21b1 and the second groove 21b2. Consequently, when the insulating film 24 is connected to the outer peripheral wall 251 of the insulating member 25 along the first direction X, the outer peripheral wall 251 along the second direction Y, and the corners of the outer peripheral wall 251 along the first direction X and the outer peripheral wall 251 along the second direction Y, the connection area between the insulating member 25 and the insulating film 24 is increased, thereby improving the connection stability between the insulating film 24 and the insulating member 25.
[0108] Referring to Figures 5, 7, and 9, in some embodiments, the outer casing 210 includes a housing 22, the interior of which forms a receiving cavity 222 with an opening 221, and a first wall 210a covers the opening 221; in a direction perpendicular to the thickness direction Z of the first wall 210a, a clearance groove 21b communicates with the outside.
[0109] It should be understood that the clearance groove 21b connects to the outside in the direction perpendicular to the thickness direction Z of the first wall 210a; that is, the clearance groove 21b is formed by a bottom wall along the thickness direction Z of the first wall 210a and a side wall along the side perpendicular to the thickness direction Z of the first wall 210a and facing the center of the first wall 210a. The other side, perpendicular to the thickness direction Z of the first wall 210a and away from the center of the first wall 210a, connects to the outside without the obstruction of a side wall.
[0110] With this configuration, the clearance groove 21b is connected to the outside in the direction perpendicular to the thickness direction Z of the first wall 210a. That is, the clearance groove 21b has no wall obstruction on the outward side, making the connection operation between the insulating film 24 and the outer peripheral wall 251 located at the clearance groove 21b more convenient.
[0111] Referring to Figures 5 and 7, in some embodiments, the insulating member 25 abuts against the bottom wall of the clearance groove 21b.
[0112] In this embodiment, the insulating member 25 is inserted into the clearance groove 21b and abuts against the bottom wall of the clearance groove 21b. In some embodiments, the extended portion of the insulating member 25 can also be fixedly connected to the bottom wall of the clearance groove 21b by adhesive bonding.
[0113] With this configuration, the insulating member 25 abuts against the bottom wall of the clearance groove 21b, thereby making the size of the insulating member 25 extending into the clearance groove 21b larger, and thus the outer peripheral wall 251 of the insulating member 25 has a larger size; thereby making the insulating member 25 and the insulating film 24 form a larger connection area, and the connection strength between the insulating member 25 and the insulating film 24 is further improved.
[0114] Referring to Figures 5 and 7, in some embodiments, the thickness of the first wall 210a is H, and the depth of the clearance groove 21b is D, wherein 0.05H≤D≤0.5H.
[0115] Optionally, the depth D of the clearance groove 21b may be, but is not limited to, 0.05H, 0.1H, 0.15H, 0.2H, 0.25H, 0.3H, 0.35H, 0.4H, 0.45H, 0.5H, etc.
[0116] This configuration limits the depth D of the clearance groove 21b to 0.05 times greater than or equal to 0.05 times the thickness H of the first wall 210a and less than or equal to 0.5 times the thickness H of the first wall 210a. This ensures that the clearance groove 21b has a certain depth to allow the extension insertion of the insulating member 25, while reducing the impact on the structural strength of the first wall 210a due to the excessive depth of the clearance groove 21b.
[0117] Referring to Figures 5 and 7, in some embodiments, a welding area 21c is provided at the outer edge of the first wall 210a, and the distance between the insulating member 25 and the welding area 21c is M, 0.8mm≤M≤3mm.
[0118] The welding area 21c refers to the region of the first wall 210a that is used to contact and weld with other parts of the housing 210 to form an integral unit. In some embodiments, the first wall 210a may be an end cap 21. The first wall 210a is welded to the housing 22 in the welding area 21c to form a fixed structure.
[0119] The distance M between the insulating member 25 and the welding area 21c refers to the shortest distance between any point on the outer peripheral wall 251 of the insulating member 25 and the welding area 21c in the direction perpendicular to the thickness direction Z of the first wall 210a. Optionally, the distance M between the insulating member 25 and the welding area 21c may be, but is not limited to, 0.8mm, 1mm, 1.2mm, 1.5mm, 1.8mm, 2mm, 2.1mm, 2.5mm, 2.7mm, 3mm, etc.
[0120] With this configuration, the distance between the welding area 21c and the outer peripheral wall 251 of the insulating member 25 is set to be greater than or equal to 0.88 mm and less than or equal to 3 mm, so that there is a sufficient gap between the insulating member 25 and the welding area 21c to reduce the impact on the insulating member 25 and its outer peripheral wall 251 when the first wall 210a is welded to other parts of the outer casing 210.
[0121] Please refer to Figures 5 and 7. In some embodiments, 1mm ≤ M ≤ 2mm.
[0122] Optionally, in this embodiment, the distance M between the insulating member 25 and the welding area 21c can be, but is not limited to, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2mm, etc.
[0123] This configuration further limits the distance between the welding area 21c and the outer peripheral wall 251 of the insulating member 25 to greater than or equal to 1 mm and less than or equal to 2 mm, so as to further reduce the impact on the insulating member 25 and its outer peripheral wall 251 when the first wall 210a is welded to other parts of the housing 210.
[0124] Referring to Figures 5 and 7, in some embodiments, the distance between the insulating film 24 and the first wall 210a is N, where 0 mm < N ≤ 2 mm.
[0125] It should be understood that the distance N between the insulating film 24 and the first wall 210a refers to the distance between the end of the insulating film 24 facing the first wall 210a and the inner wall surface of the first wall 210a in the thickness direction Z of the first wall 210a.
[0126] Optionally, the spacing N between the insulating film 24 and the first wall 210a may be, but is not limited to, 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2mm, etc.
[0127] This configuration limits the distance between the insulating film 24 and the first wall 210a to greater than 0 and less than or equal to 2 mm, so that a gap is formed between the insulating member 25 and the first wall 210a, thereby reducing the impact of the first wall 210a on the connection operation between the insulating film 24 and the insulating member 25; at the same time, the gap does not exceed 2 mm, so as to ensure the connection area between the insulating film 24 and the insulating member 25.
[0128] Please refer to Figures 5 and 7. In some embodiments, 0.5mm ≤ N ≤ 1.5mm.
[0129] This configuration further limits the distance between the insulating film 24 and the first wall 210a to greater than or equal to 0.5 mm and less than or equal to 1.5 mm, thereby further reducing the impact of the first wall 210a on the connection operation between the insulating film 24 and the insulating component 25 and further ensuring the connection area between the insulating film 24 and the insulating component 25.
[0130] Referring to Figures 5 and 7, in some embodiments, in the thickness direction Z of the first wall 210a, the dimension of at least a portion of the outer peripheral wall 251 of the insulating member 25 is greater than or equal to 4 mm.
[0131] In this embodiment, the dimension K of the outer peripheral wall 251 of the insulating member 25 can be as shown in FIG7. The dimension K of at least part of the outer peripheral wall 251 of the insulating member 25 can be set to be greater than or equal to 4mm, so that the insulating film 24 and the outer peripheral wall 251 of the insulating member 25 have sufficient connection area.
[0132] With this configuration, by limiting the dimension of at least a portion of the outer peripheral wall 251 of the insulating member 25 along the thickness direction Z of the first wall 210a to be greater than or equal to 4 mm, a sufficient connection area can be formed between the insulating film 24 and the outer peripheral wall 251, so that the connection strength between the insulating film 24 and the outer peripheral wall 251 can be guaranteed, thereby reducing the probability of the insulating film 24 falling off.
[0133] The battery cell 20 provided in this application will now be described in detail according to specific embodiments.
[0134] Referring to Figures 5 to 9, in this embodiment, the battery cell 20 includes a housing 210, an electrode assembly 23, an insulating film 24, and an insulating element 25. The housing 210 has an internal cavity 222 and includes a first wall 210a. In this embodiment, the first wall 210a may refer to an end cap 21. The housing 210 also includes a shell 22; the end cap 21 seals the opening 221 of the shell 22 and together they enclose the cavity 222. The electrode assembly 23 is housed within the cavity 222, and the insulating film 24 covers at least a portion of the electrode assembly 23. An insulating member 25 is disposed on the inner wall surface of the first wall 210a (i.e., the end cap 21). The insulating member 25 has an outer peripheral wall 251 circumferentially arranged around the thickness direction Z of the end cap 21, and an insulating film 24 is connected to the outer peripheral wall 251. A clearance groove 21b is provided on the inner wall surface of the end cap 21, and a portion of the insulating member 25 is disposed in the clearance groove 21b so that a portion of the outer peripheral wall 251 is located in the clearance groove 21b.
[0135] The end cap 21 has a thickness direction Z and a first direction X and a second direction Y perpendicular to the thickness direction Z. In this embodiment, the first direction X can refer to the length direction of the end cap 21, and the second direction Y can refer to the width direction of the end cap 21. In the first direction X, the end cap 21 includes a middle section 211 and side sections 212 connected to opposite ends of the middle section 211. At least a portion of the middle section 211 protrudes outward from the receiving cavity 222. An insulating member 25 connects the middle section 211 and the side sections 212. A clearance groove 21b is provided on the inner wall surface of both side sections 212.
[0136] The clearance groove 21b includes a first groove 21b1 and a second groove 21b2. The first groove 21b1 is formed at the end of the side section 212 away from the middle section 211 in the first direction X. The second grooves 21b2 are formed at opposite ends of the side section 212 in the second direction Y. In the same side section 212, the first groove 21b1 is connected to the two second grooves 21b2. Thus, the insulating member 25 can be bonded and fixed to the inner wall surface of the middle section 211 and the side section 212. At the same time, a portion of the insulating member 25 can also be disposed in the first groove 21b1 and the second groove 21b2, so that a portion of the outer peripheral wall 251 is located in the first groove 21b1 and the second groove 21b2. Therefore, the outer peripheral wall 251 has a larger size along the thickness direction Z of the end cap 21. When the insulating film 24 is connected to the outer peripheral wall 251, a larger connection area can be formed between the insulating film 24 and the outer peripheral wall 251, thereby effectively improving the connection strength between the insulating film 24 and the insulating element 25.
[0137] Referring to Figure 2, this application embodiment also provides a battery device 100, including a housing and a battery cell 20 as described above, wherein the battery cell 20 is housed within the housing.
[0138] The battery device 100 provided in this application embodiment includes the aforementioned battery cell 20. When the connection strength of the insulating film 24 and the insulating member 25 of the aforementioned battery cell 20 is better, the reliability of the battery device 100 is better.
[0139] Referring to Figure 1, this application embodiment also provides an electrical device, including a battery cell 20 as described above, and / or a battery device 100 as described above, wherein the battery cell 20 and / or the battery device 100 are used to provide electrical energy.
[0140] The electrical device provided in this application includes the aforementioned battery cell 20 and / or battery device 100, thereby improving the reliability of the electrical device.
[0141] The above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.
Claims
1. A single battery cell, characterized in that: include An outer shell having an internal cavity, the outer shell including a first wall; The electrode assembly is housed within the receiving cavity; An insulating film is used to enclose at least a portion of the electrode assembly; as well as An insulating element is disposed on the inner sidewall surface of the first wall; the insulating element has an outer peripheral wall circumferentially arranged around the thickness direction of the first wall, and the insulating film is connected to the outer peripheral wall; The inner side wall of the first wall is provided with a clearance groove, and a portion of the insulating component is disposed in the clearance groove so that a portion of the outer peripheral wall is located in the clearance groove.
2. The battery cell according to claim 1, characterized in that: The clearance groove is disposed on the inner side wall of the first wall; in the thickness direction of the first wall, the projection of the outer peripheral wall is located within the range of the clearance groove.
3. The battery cell according to claim 1, characterized in that: The first wall has a first direction and a second direction that are both perpendicular to the thickness direction; in the first direction, at least one end of the inner sidewall of the first wall is provided with the clearance groove; and / or, in the second direction, at least one end of the inner sidewall of the first wall is provided with the clearance groove.
4. The battery cell according to claim 3, characterized in that: In the first direction, the first wall includes a middle section and side sections connected to opposite ends of the middle section, at least a portion of the middle section protruding outward from the receiving cavity, the insulating member connecting the middle section and the side sections; the clearance groove is formed on the inner wall surface of the side sections.
5. The battery cell according to claim 4, characterized in that: The clearance groove includes a first groove and a second groove. The first groove is formed at one end of the side segment away from the middle segment in the first direction, and the second groove is formed at opposite ends of the side segment in the second direction. The first direction is perpendicular to the second direction.
6. The battery cell according to claim 5, characterized in that: In the same side section, the first groove is connected to two second grooves.
7. The battery cell according to any one of claims 1 to 6, characterized in that: The outer casing includes a housing, the interior of which forms the receiving cavity with an opening, and the first wall seals the opening; The clearance groove connects to the outside in a direction perpendicular to the thickness direction of the first wall.
8. The battery cell according to any one of claims 1 to 7, characterized in that: The insulating element abuts against the bottom wall of the clearance groove.
9. The battery cell according to any one of claims 1 to 8, characterized in that: The thickness of the first wall is H, and the depth of the clearance groove is D, wherein 0.05H≤D≤0.5H.
10. The battery cell according to any one of claims 1 to 9, characterized in that: A welding area is provided at the outer edge of the first wall, and the distance between the insulating component and the welding area is M, where 0.8mm≤M≤3mm.
11. The battery cell according to claim 10, characterized in that: 1mm≤M≤2mm.
12. The battery cell according to any one of claims 1 to 11, characterized in that: The distance between the insulating film and the first wall is N, where 0 mm < N ≤ 2 mm.
13. The battery cell according to claim 12, characterized in that: 0.5mm≤N≤1.5mm.
14. The battery cell according to any one of claims 1 to 13, characterized in that: In the thickness direction of the first wall, at least a portion of the outer peripheral wall has a dimension greater than or equal to 4 mm.
15. A battery device, characterized in that: It includes a housing and a battery cell as described in any one of claims 1 to 14, wherein the battery cell is housed within the housing.
16. An electrical appliance, characterized in that: Includes a battery cell as described in any one of claims 1 to 14, and / or includes a battery device as described in claim 15, wherein the battery cell and / or the battery device are used to provide electrical energy.