Battery cell, battery, and electric device

Abstract

The application relates to the technical field of battery structures, and provides a battery monomer, a battery and an electric equipment, wherein the battery monomer comprises a shell, an electrode assembly and an insulation protective layer; the shell has a containing cavity; the electrode assembly is arranged in the containing cavity; and the insulation protective layer is wrapped around the electrode assembly; the battery monomer provided by the application utilizes the insulation protective layer to wrap the electrode assembly, separates the electrode assembly and the shell through the insulation protective layer, improves the creepage distance between the shell and the electrode assembly, can realize the purpose of improving the withstand voltage between the shell and the electrode assembly, and can effectively improve the high-voltage withstand capability of the shell, and realizes the purpose of reducing the probability of combustion or explosion of the battery monomer.

Description

Technical Field

[0001] This application relates to the field of battery structure technology, and in particular provides a battery cell, a battery, and an electrical device. Background Technology

[0002] In related technologies, multiple battery cells are connected in series and then in parallel to form a group; however, multiple battery cells connected in series will generate high voltage. When one of the battery cells melts, a high voltage will be formed between the battery cell's casing and the electrode assembly. The casing is prone to high voltage breakdown, which may lead to the risk of the battery cell burning or exploding. Summary of the Invention

[0003] The purpose of this application is to provide a battery cell, a battery, and an electrical device, which aims to solve the problem that the casing of the battery cell is prone to high-voltage breakdown under high-voltage conditions.

[0004] To achieve the above objectives, the technical solution adopted in the embodiments of this application is as follows:

[0005] In a first aspect, embodiments of this application provide a battery cell including a casing, an electrode assembly, and an insulating protective layer. The casing has a receiving cavity, the electrode assembly is disposed within the receiving cavity, and the insulating protective layer covers the electrode assembly.

[0006] The beneficial effects of the embodiments of this application are as follows: The battery cell provided in the embodiments of this application uses an insulating protective layer to cover the electrode assembly. The insulating protective layer separates the electrode assembly and the shell, thereby increasing the creepage distance between the shell and the electrode assembly. This can improve the breakdown voltage between the shell and the electrode assembly, and thus effectively improve the high voltage breakdown resistance of the shell, thereby reducing the probability of the battery cell burning or exploding.

[0007] In some embodiments, the housing includes an end cap and a housing, the housing having a receiving cavity with an opening, the end cap being disposed at the opening; a lower plastic layer is disposed on the inner surface of the end cap, the lower plastic layer being at least partially connected to the insulating protective layer and forming a sealed connection segment.

[0008] By adopting the above technical solution, at least a portion of the lower plastic layer is connected to at least a portion of the insulating protective layer to form a sealed connection section. The lower plastic layer and the insulating protective layer work together to provide insulation and protection for the electrode assembly, further increasing the creepage distance between the electrode assembly and the casing, thereby further improving the breakdown voltage between the casing and the electrode assembly, optimizing the high voltage breakdown resistance of the casing, and further reducing the probability of battery cells burning or exploding.

[0009] In some embodiments, the battery cell further includes an adapter piece electrically connected to the electrode assembly, and at least a portion of the adapter piece has a sealed connection section between it and the housing.

[0010] By adopting the above technical solution, by setting a sealed connection section between at least part of the adapter piece and the housing, that is, by connecting the lower plastic layer and the insulating protective layer between at least part of the adapter piece and the housing to form a separation, the creepage distance between the adapter piece and the housing is effectively improved, thereby improving the housing's resistance to high voltage breakdown.

[0011] In some embodiments, the housing includes a plurality of sidewalls, and a sealing connection section is provided between the adapter plate and each sidewall.

[0012] By adopting the above technical solution, a sealed connection section is formed between the adapter plate and each side wall of the housing through a lower plastic layer and an insulating protective layer. As a result, the creepage distance between the adapter plate and each side wall of the housing is improved, that is, the breakdown voltage between the adapter plate and any side of the housing is improved, and the high voltage breakdown resistance of the housing is effectively improved.

[0013] In some embodiments, the adapter piece has an outer edge, and the sealing connection section is configured to block the shortest path from the outer edge to the sidewall.

[0014] By adopting the above technical solution, the sealed connection section can block the shortest path from the outer edge to the side wall, and the creepage distance between any point on the outer edge and any side wall can be increased, thereby improving the breakdown voltage between the adapter piece and any side of the housing and effectively improving the high voltage breakdown capability of the housing.

[0015] In some embodiments, the sealing connection section is annular and wrapped around the adapter piece.

[0016] By adopting the above technical solution, the sealing connection section is arranged around the adapter plate, which means that the sealing connection section can fully separate the adapter plate and the housing, effectively improving the breakdown voltage between the adapter plate and the housing, and effectively improving the high voltage breakdown capability of the housing.

[0017] In some embodiments, there is a gap between the adapter plate and the sealing connection section.

[0018] By adopting the above technical solution, the sealing connection section and the adapter piece are set at intervals, that is, there is a gap between the connection between the lower plastic layer and the insulating protective layer and the adapter piece, thereby effectively improving the convenience of connecting the lower plastic layer and the insulating protective layer and reducing the interference between the sealing connection section and the adapter piece.

[0019] In some embodiments, the gap width between the adapter plate and the sealing connection section is M, where 0 < M ≤ 50 mm.

[0020] By adopting the above technical solution, the gap width between the adapter piece and the sealing connection section is set to be greater than 0 and less than or equal to 50 mm. The sealing connection section can form a gap with the adapter piece, effectively providing insulation protection for the adapter piece, thereby increasing the creepage distance between the adapter piece and the housing and improving the adapter piece's resistance to high voltage breakdown.

[0021] In some embodiments, the gap width between the adapter plate and the sealing connection section is M, where 3mm ≤ M ≤ 10mm.

[0022] By adopting the above technical solution, the gap width between the adapter piece and the sealing connection section is set to be greater than or equal to 3 mm and less than or equal to 10 mm. The sealing connection section can form a gap with the adapter piece, effectively providing insulation protection for the adapter piece, thereby increasing the creepage distance between the adapter piece and the housing and improving the adapter piece's resistance to high voltage breakdown.

[0023] In some embodiments, the sealing connection section has a sealing width N, where 0 < N ≤ 3 mm.

[0024] By adopting the above technical solution, the sealing width of the sealing connection section is set to be greater than 0 and less than or equal to 3 mm, so that the connection between the lower plastic layer and the insulating protective layer has a certain sealing width, thereby ensuring the insulating protective performance of the sealing connection section.

[0025] In some embodiments, the sealing connection section has a sealing width N, where 1 mm ≤ N ≤ 3 mm.

[0026] By adopting the above technical solution, the sealing width of the sealing connection section is set to be greater than or equal to 1 mm and less than or equal to 3 mm, so that the connection between the lower plastic layer and the insulating protective layer has a certain sealing width, thereby ensuring the insulating protective performance of the sealing connection section.

[0027] In some embodiments, the insulating protective layer includes a first insulating portion and a second insulating portion, with a sealing crease between the first insulating portion and the second insulating portion, and the first insulating portion and / or the second insulating portion is configured to be able to bend around the sealing crease.

[0028] By adopting the above technical solution, the first insulating part can be used to provide insulation protection for the side of the electrode assembly, and the first insulating part and / or the second insulating part can be used to provide insulation protection for the bottom of the electrode assembly after bending around the sealing crease, which effectively improves the insulation protection effect of the insulating protective layer on the electrode assembly.

[0029] Secondly, embodiments of this application also provide a battery, including the battery cell as described above.

[0030] The beneficial effects of the embodiments of this application are as follows: The battery provided in the embodiments of this application includes the above-mentioned battery cell. Based on the fact that the casing of the battery cell has better resistance to high voltage breakdown, the probability of the battery burning or exploding is effectively reduced.

[0031] Thirdly, embodiments of this application also provide an electrical device, including the battery as described above.

[0032] The beneficial effects of the embodiments of this application are as follows: The electrical equipment provided in the embodiments of this application includes the battery described above. Since the probability of the battery burning or exploding is low, the probability of the electrical equipment burning or exploding is also low. Attached Figure Description

[0033] 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.

[0034] Figure 1 This application provides structural schematic diagrams of vehicles for some embodiments;

[0035] Figure 2 Exploded views of batteries provided for some embodiments of this application;

[0036] Figure 3 This is an exploded structural diagram of a battery cell provided in some embodiments of this application;

[0037] Figure 4 This is a schematic diagram of the internal structure of a battery cell provided in some embodiments of this application;

[0038] Figure 5 for Figure 4 A magnified view of part A;

[0039] Figure 6 for Figure 4 A magnified view of part B;

[0040] Figure 7 This is a schematic diagram of the end cap structure provided in some embodiments of this application;

[0041] Figure 8 A schematic diagram illustrating the positional relationship between an adapter piece and a sealing connector provided in some embodiments of this application;

[0042] Figure 9 This is a schematic diagram showing the positional relationship between an adapter piece and a sealing connector, provided for some embodiments of this application.

[0043] The following are the labeling elements in the figure:

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

[0045] Box 10, Part 11, Part 2 12;

[0046] Battery cell 20, casing 21, receiving cavity 21a, end cap 211, electrode terminal 211a, housing 212, electrode assembly 22, electrode tab 22a, connecting cavity 221, insulating protective layer 23, first insulating part 231, second insulating part 232, sealing crease 233, lower plastic layer 24, sealing connection section 25, adapter piece 26, first adapter part 261, second adapter part 262, outer edge part 263. Detailed Implementation

[0047] 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.

[0048] 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.

[0049] 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.

[0050] 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.

[0051] 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.

[0052] Battery cells are typically connected in series or parallel to form battery modules or batteries for use. During the operation of a battery or battery module, a battery cell may melt. In this case, a high voltage may be generated between the electrode components and the casing of the battery cell, which may cause the casing to break down under high voltage, thus leading to the risk of the battery cell burning or exploding.

[0053] Based on the above considerations, in order to solve the problem that the casing of a battery cell is prone to high-voltage breakdown under high-voltage conditions, a battery cell is designed in which an insulating protective layer is wrapped around the electrode assembly. This allows the insulating protective layer to separate the electrode assembly from the casing, thereby increasing the creepage distance between the casing and the electrode assembly. This improves the breakdown voltage between the casing and the electrode assembly, effectively enhancing the casing's ability to withstand high-voltage breakdown and reducing the probability of the battery cell burning or exploding.

[0054] The battery cells disclosed in this application can be used in electrical devices that use batteries as a power source or in 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, 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.

[0055] 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.

[0056] Please refer to Figure 1 , Figure 1This is a schematic diagram of the structure 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 100 is disposed inside the vehicle 1000, and the battery 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery 100 can be used to power the vehicle 1000; for example, the battery 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 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle 1000 during startup, navigation, and driving.

[0057] In some embodiments of this application, the battery 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.

[0058] Please refer to Figure 2 , Figure 2 This is an exploded view of a battery 100 provided in some embodiments of this application. The battery 100 includes a housing 10 and a battery cell 20, with the battery cell 20 housed within the housing 10. The housing 10 provides a space for the battery cell 20 and can have various structures. In some embodiments, the housing 10 may include a first portion 11 and a second portion 12, which overlap each other, jointly defining a space for accommodating the battery cell 20. The second portion 12 may be a hollow structure with one open end, and the first portion 11 may be a plate-like structure, covering the open side of the second portion 12 so that the first portion 11 and the second portion 12 jointly define the space; alternatively, the first portion 11 and the second portion 12 may both be hollow structures with one open side, with the open side of the first portion 11 covering the open side of the second portion 12. Of course, the housing 10 formed by the first portion 11 and the second portion 12 can have various shapes, such as a cylinder, a cuboid, etc.

[0059] In battery 100, there can be multiple battery cells 20, which can be connected in series, parallel, or in a mixed manner. A mixed connection means that multiple battery cells 20 are connected in both series and parallel configurations. Multiple battery cells 20 can be directly connected in series, parallel, or in a mixed manner, and then the entire assembly of the multiple battery cells 20 is housed within the housing 10. Alternatively, battery 100 can also be composed of multiple battery cells 20 first connected in series, parallel, or in a mixed manner to form a battery module, and then multiple battery modules are connected in series, parallel, or in a mixed manner to form a whole, which is also housed within the housing 10. Battery 100 may also include other structures; for example, it may include a busbar component for electrical connection between the multiple battery cells 20.

[0060] Each battery cell 20 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited to these. The battery cell 20 can be cylindrical, flat, cuboid, or other shapes.

[0061] Please refer to Figure 3 , Figure 3 This is an exploded structural diagram of a battery cell 20 provided in some embodiments of this application. The battery cell 20 refers to the smallest unit that makes up a battery. Figure 3 The battery cell 20 includes a casing 21, an electrode assembly 22, and other functional components; wherein the casing 21 includes an end cap 211 and a housing 212.

[0062] End cap 211 refers to a component that covers the opening of housing 212 to isolate the internal environment of battery cell 20 from the external environment. The shape of end cap 211 can be adapted to the shape of housing 212 to fit it. Optionally, end cap 211 can be made of a material with certain hardness and strength (such as aluminum alloy), so that end cap 211 is not easily deformed under pressure and impact, giving battery cell 20 higher structural strength and improved reliability. Functional components such as electrode terminals 211a can be provided on end cap 211. Electrode terminals 211a can be electrically connected to electrode assembly 22 for outputting or inputting electrical energy into battery cell 20. Each electrode terminal 211a includes a positive terminal, a negative terminal, and an outer plastic layer. One end of the positive and negative terminals can be directly connected to a busbar, and the other end can be connected to one of the terminals of an adjacent battery cell 20 in the battery 100 or battery module. In some embodiments, the end cap 211 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 211 can be made of various materials, including but not limited to copper, iron, aluminum, stainless steel, and aluminum alloy.

[0063] The housing 212 is a component used to cooperate with the end cap 211 to form the internal environment of the battery cell 20. This internal environment can accommodate the electrode assembly 22, electrolyte, and other components. The housing 212 and the end cap 211 can be independent components. An opening can be provided on the housing 212, and the end cap 211 can be used to close the opening to form the internal environment of the battery cell 20. Alternatively, the end cap 211 and the housing 212 can be integrated. Specifically, the end cap 211 and the housing 212 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 212, the end cap 211 closes the housing 212. The housing 212 can be of various shapes and sizes, such as cuboid, cylindrical, hexagonal prism, etc. Specifically, the shape of the housing 212 can be determined according to the specific shape and size of the electrode assembly 22. The housing 212 can be made of various materials, including but not limited to copper, iron, aluminum, stainless steel, and aluminum alloy.

[0064] Electrode assembly 22 is the component in the battery cell 20 where electrochemical reactions occur. The casing 212 may contain one or more electrode assemblies 22. The electrode assembly 22 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 22, while the portions of the positive and negative electrode sheets without active material each constitute a tab 22a. 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 22a connect to the electrode terminals to form a current loop.

[0065] According to some embodiments of this application, please refer to Figure 3 and Figure 4 This application provides a battery cell 20, including a housing 21, an electrode assembly 22 and an insulating protective layer 23. The housing 21 has a receiving cavity 21a, the electrode assembly 22 is disposed in the receiving cavity 21a, and the insulating protective layer 23 covers the electrode assembly 22.

[0066] Among them, the insulating protective layer 23 is an insulating layer structure. The insulating protective layer 23 can be, but is not limited to, an insulating coating, an insulating film, an insulating adhesive layer, etc. The insulating protective layer 23 can be directly connected to the electrode assembly 22, for example, by coating, bonding or other means and set on the outer surface of the electrode assembly 22; or, the insulating protective layer 23 can be set on the outer surface of the electrode assembly 22 by sleeve or covering.

[0067] Understandably, the electrode assembly 22 is disposed in the receiving cavity 21a of the housing 21. The distance between the electrode assembly 22 and the housing 21 is small, so the creepage distance between the electrode assembly 22 and the housing 21 is small. Under the condition that a high voltage environment is formed between the electrode assembly 22 and the housing 21, the housing 21 is prone to high voltage breakdown. Therefore, by using the insulating protective layer 23 to cover the electrode assembly 22 to separate the electrode assembly 22 and the housing 21, the creepage distance between the electrode assembly 22 and the housing 21 can be increased. Therefore, the electrode assembly 22 and the housing 21 can withstand higher voltages without being broken down. That is, the breakdown voltage between the housing 21 and the electrode assembly 22 is improved, and the high voltage breakdown resistance of the housing 21 is also effectively improved.

[0068] The battery cell 20 provided in this application embodiment uses an insulating protective layer 23 to cover the electrode assembly 22. The insulating protective layer 23 separates the electrode assembly 22 from the outer casing 21, thereby increasing the creepage distance between the outer casing 21 and the electrode assembly 22. This can improve the breakdown voltage between the outer casing 21 and the electrode assembly 22, and thus effectively improve the high voltage breakdown resistance of the outer casing 21, thereby reducing the probability of the battery cell 20 burning or exploding.

[0069] According to some embodiments of this application, please refer to Figures 3 to 5 The outer casing 21 includes an end cap 211 and a housing 212. The housing 212 has a receiving cavity 21a with an opening, and the end cap 211 is disposed on the opening. A lower plastic layer 24 is disposed on the inner surface of the end cap 211. The lower plastic layer 24 is at least partially connected to the insulating protective layer 23 and forms a sealed connection section 25.

[0070] The lower plastic layer 24 is disposed on the inner wall of the end cap 211 and serves to provide insulation and protection for the inner wall of the end cap 211. The lower plastic layer 24 can be fixed to the inner wall of the end cap 211 by adhesion. Understandably, the inner wall of the end cap 211 refers to the wall surface of the end cap 211 facing the housing 212.

[0071] The aforementioned sealing connection section 25 refers to the junction of the lower plastic layer 24 and the insulating protective layer 23. Understandably, the lower plastic layer 24 and the insulating protective layer 23 can be connected by heat fusion, melting portions of both layers and fusing them together. After cooling, the lower plastic layer 24 and the insulating protective layer 23 will form an integral structure, and the junction where they are fused together is the sealing connection section 25. Alternatively, the lower plastic layer 24 and the insulating protective layer 23 can be connected by adhesive bonding, fixing portions of both layers together. The junction where the lower plastic layer 24 and the insulating protective layer 23 are bonded together is the sealing connection section 25.

[0072] Optionally, the insulating protective layer 23 can be connected to the end face of the lower plastic layer 24 facing the electrode assembly 22, that is, the sealing connection section 25 formed by the connection of the insulating protective layer 23 and the lower plastic layer 24 is formed on the end face of the lower plastic layer 24 facing the electrode assembly 22; or, the insulating protective layer 23 can also be connected to the side where the lower plastic layer 24 intersects with the inner wall of the end cap 211, the sealing connection section 25 formed by the connection of the insulating protective layer 23 and the lower plastic layer 24 is formed on the side where the lower plastic layer 24 intersects with the inner wall of the end cap 211, that is, the insulating protective layer 23 covers the electrode assembly 22 and extends toward the end cap 211, and the insulating protective layer 23 can cover the outer surface (side surface of the lower plastic layer 24) of the lower plastic layer 24 and form the sealing connection section 25, such as Figure 7 As shown, the insulating protective layer 23 can be attached to the side of the lower plastic layer 24 in the figure, at the location indicated by the shaded line.

[0073] The insulating protective layer 23 may be partially connected to the lower plastic layer 24, or the insulating protective layer 23 may surround the lower plastic layer and be connected to the lower plastic layer to form a sealed connection section 25.

[0074] This configuration connects at least a portion of the lower plastic layer 24 with at least a portion of the insulating protective layer 23 to form a sealed connection section 25. The lower plastic layer 24 and the insulating protective layer 23 work together to provide insulation and protection for the electrode assembly 22, further increasing the creepage distance between the electrode assembly 22 and the housing 21. This further improves the breakdown voltage between the housing 21 and the electrode assembly 22, optimizing the high-voltage breakdown resistance of the housing 212, and further reducing the probability of the battery cell 20 burning or exploding.

[0075] According to some embodiments of this application, please refer to Figures 3 to 7 The battery cell 20 also includes an adapter piece 26, which is electrically connected to the electrode assembly 22. At least a portion of the adapter piece 26 is provided with a sealed connection section 25 between it and the housing 212.

[0076] The adapter piece 26 is used to connect the terminals (including positive terminals, negative terminals, etc.) provided on the end cap 211 to the tabs of the electrode assembly 22 to form a current conduction. Understandably, the adapter piece 26 is generally located between the electrode assembly 22 and the end cap 211, and is in contact with the terminals on the end cap 211. Another part of the adapter piece 26 is located in the receiving cavity 21a and is in contact with the tabs of the electrode assembly 22.

[0077] The adapter piece 26 is a live structure, therefore, high voltage may also be generated between the adapter piece 26 and the housing 212, as well as between the adapter piece 26 and the weld between the housing 212 and the end cap 211. A sealed connection section 25 is formed between the adapter piece 26 and the housing 212 by using the lower plastic layer 24 and the insulating protective layer 23. The sealed connection section 25 separates the adapter piece 26 and the housing 212, thereby increasing the creepage distance between the adapter piece 26 and the housing 212, and thus improving the high voltage breakdown resistance of the housing 212.

[0078] Optionally, a sealing connection section 25 may be provided between the housing 212 and part of the adapter piece 26; or, a sealing connection section 25 may be provided between both the housing 212 and the adapter piece 26, that is, the sealing connection section 25 can surround the adapter piece 26 to improve the creepage between the adapter piece 26 and the housing 212.

[0079] This configuration effectively increases the creepage distance between the adapter piece 26 and the housing 212 by providing a sealed connection section 25 between at least a portion of the adapter piece 26 and the housing 212, i.e., connecting the lower plastic layer 24 and the insulating protective layer 23 between at least a portion of the adapter piece 26 and the housing 212 to form a separation, thereby improving the high voltage breakdown resistance of the housing 212.

[0080] According to some embodiments of this application, please refer to Figures 4 to 9 The housing 212 includes several side walls, and a sealing connection section 25 is provided between the adapter piece 26 and each side wall.

[0081] Here, the sidewall of housing 212 refers to the ring of walls surrounding housing 212 along the height direction. Understandably, the sidewall of housing 212 forms an opening at one end in the height direction and is used for welding and assembly with end cap 211.

[0082] The housing 212 of the battery cell 20 may be, but is not limited to, a cylindrical housing 212, a rectangular housing 212, or other housing configurations 212. For example, when the housing 212 is a cylindrical housing 212, the cylindrical housing 212 includes an annular sidewall, and the lower plastic layer 24 and the insulating protective layer 23 can be connected to form a sealing connection section 25, and the sealing connection section 25 is annularly disposed around the adapter piece 26, so that the sealing connection section 25 can separate the adapter piece 26 from the annular sidewall; or, when the housing 212 is a rectangular housing 212, the rectangular housing 212 includes four sidewalls connected in sequence, and the lower plastic layer 24 and the insulating protective layer 23 can be connected to form four sealing connection sections 25, each sealing connection section 25 being formed between the adapter piece 26 and the corresponding sidewall, so that each sealing connection section 25 can separate the adapter piece 26 from the corresponding sidewall, specifically as follows: Figure 8 As shown; or, when the housing 212 is a rectangular housing 212, the rectangular housing 212 includes four side walls connected in sequence, the lower plastic layer 24 and the insulating protective layer 23 can be connected to form a sealing connection section 25, and the sealing connection section 25 is circumferentially disposed around the adapter piece 26, so that the sealing connection section 25 can circumferentially displace the adapter piece 26 and separate it from all four side walls, specifically as shown. Figure 9 As shown.

[0083] With this configuration, a sealed connection section 25 is formed between the adapter piece 26 and each side wall of the housing 212 through the lower plastic layer 24 and the insulating protective layer 23. As a result, the creepage distance between the adapter piece 26 and each side wall of the housing 212 is increased, that is, the breakdown voltage between the adapter piece 26 and any side of the housing 212 is increased, and the high voltage breakdown resistance of the housing 212 is effectively improved.

[0084] According to some embodiments of this application, please refer to Figures 4 to 8 The adapter piece 26 has an outer edge 263, and the sealing connection section 25 is configured to block the shortest path from the outer edge 263 to the sidewall.

[0085] The outer edge 263 of the adapter piece 26 refers to the side surface of the adapter piece 26 surrounding its own thickness.

[0086] The shortest path from the outer edge 263 to the side wall refers to the path formed by any point on the outer edge 263 along a direction perpendicular to the side wall and reaching the side wall. The length of the shortest path is the distance between that point on the outer edge 263 and the side wall.

[0087] The sealing connection section 25 can block the shortest path from the outer edge 263 to the side wall. This means that any point on the outer edge 263 must pass through the sealing connection section 25 between the side wall and the adapter piece 26 to reach the side wall. Thus, the sealing connection section 25 can effectively block the creepage between the adapter piece 26 and the side wall, thereby increasing the creepage distance and improving the breakdown voltage between the adapter piece 26 and any side of the housing 212. This effectively improves the high voltage breakdown resistance of the housing 212.

[0088] Understandably, the shortest path from the outer edge 263 to any sidewall can be blocked by the sealing connection section 25 disposed between the sidewall and the adapter piece 26.

[0089] With this configuration, the sealed connection section 25 can block the shortest path from the outer edge 263 to the side wall, and the creepage distance between any point on the outer edge 263 and any side wall can be increased, thereby improving the breakdown voltage between the adapter piece 26 and any side wall of the housing 212, and effectively improving the high voltage breakdown resistance of the housing 212.

[0090] It should be understood that the electrode assembly 22 includes a tab 22a, and the adapter piece 26 can be connected at one end to the tab 22a and at the other end to the pole provided on the end cap 211; at this time, the outer edge 263 of the adapter piece 26 is a side wall surface of the adapter piece 26 around its own thickness direction.

[0091] Alternatively, the adapter piece 26 may include a first adapter portion 261 and a second adapter portion 262. The first adapter portion 261 is disposed between the electrode tab 22a and the end cap 211, and is used to connect to the electrode post disposed on the end cap 211. The electrode tab 22a can extend between the first adapter portion 261 and the second adapter portion 262, and is used to connect with the second adapter portion 262. In this case, the outer edge 263 of the adapter piece 26 refers to a ring of sidewall surface of the first adapter portion 261 around its own thickness direction, specifically as follows: Figure 5 and Figure 7 As shown.

[0092] The first adapter 261 and the second adapter 262 can be, but are not limited to, sheet structures, block structures, etc.; the first adapter 261 and the second adapter 262 can be welded together, or the first adapter 261 and the second adapter 262 can be integrally formed. The second adapter 262 can be connected to the electrode tab 22a by welding.

[0093] The tab 22a is bent to fit into the second adapter 262, thereby connecting with the second adapter 262; optionally, the tab 22a can be bent to form a connecting cavity 221 for insertion into the second adapter 262, thereby achieving a reliable connection between the tab 22a and the second adapter 262.

[0094] According to some embodiments of this application, please refer to Figures 4 to 7 as well as Figure 9 The sealing connection section 25 is annular and wrapped around the adapter piece 26.

[0095] Understandably, the sealing connection section 25 is annular, that is, the lower plastic layer 24 and the insulating protective layer 23 surround the adapter piece 26 for connection, and the sealing connection section 25 formed by the connection of the lower plastic layer 24 and the insulating protective layer 23 can surround the adapter piece 26, effectively improving the creepage distance between the adapter piece 26 and the housing 212.

[0096] With this configuration, the sealing connection section 25 is wound around the adapter piece 26, which means that the sealing connection section 25 can fully separate the adapter piece 26 and the housing 212, effectively improving the breakdown voltage between the adapter piece 26 and the housing 212, and effectively improving the high voltage breakdown resistance of the housing 212.

[0097] According to some embodiments of this application, please refer to Figure 4 and Figure 5 There is a gap between the adapter piece 26 and the sealing connection section 25.

[0098] Understandably, when the adapter plate 26 includes a first adapter portion 261 and a second adapter portion 262, the gap between the adapter plate 26 and the sealing connection section 25 can be formed between the first adapter portion 261 and the sealing connection section 25.

[0099] This arrangement, with the sealing connection section 25 and the adapter piece 26 spaced apart, creates a gap between the connection between the lower plastic layer 24 and the insulating protective layer 23 and the adapter piece 26, providing operating space between the sealing connection section 25 and the adapter piece 26. This effectively improves the ease of assembly between the lower plastic layer 24, the insulating protective layer 23, and the adapter piece 26, while also reducing interference between the sealing connection section 25 and the adapter piece 26.

[0100] According to some embodiments of this application, please refer to Figure 4 and Figure 5 The gap width between the adapter piece 26 and the sealing connection section 25 is M, where 0 < M ≤ 50 mm (hereinafter referred to as "mm" instead of millimeters).

[0101] Understandably, in this embodiment, the gap width M between the adapter piece 26 and the sealing connection section 25 can specifically be the gap width between the first adapter portion 261 of the adapter piece 26 and the sealing connection section 25 on the corresponding side, specifically as follows: Figure 5 As shown.

[0102] With this configuration, the gap width between the adapter piece 26 and the sealing connection section 25 is set to be greater than 0 and less than or equal to 50 mm. The sealing connection section 25 can form a gap with the adapter piece 26, effectively providing insulation protection for the adapter piece 26. This achieves the purpose of increasing the creepage distance between the adapter piece 26 and the housing 212 and improving the high voltage breakdown resistance of the adapter piece 26.

[0103] According to some embodiments of this application, please refer to Figure 4 and Figure 5 The gap width between the adapter piece 26 and the sealing connection section 25 is M, 3mm≤M≤10mm.

[0104] This configuration optimizes the gap width between the adapter piece 26 and the sealing connection section 25 to 3mm to 10mm, thereby further reducing the interference between the sealing connection section 25 and the adapter piece 26, while increasing the creepage distance between the adapter piece 26 and the housing 212, and improving the high voltage breakdown resistance of the adapter piece 26.

[0105] According to some embodiments of this application, please refer to Figure 4 and Figure 5 The sealing connection section 25 has a sealing width N, where 0 < N ≤ 3 mm.

[0106] The sealing width of the sealing connection section 25 refers to the width of the connection between the lower plastic layer 24 and the insulating protective layer 23. Optionally, when the insulating protective layer 23 is connected to the side of the lower plastic layer 24 to form the sealing connection section 25, the sealing width of the sealing connection section 25 is specifically the width along the thickness direction of the lower plastic layer 24.

[0107] With this setting, the sealing width of the sealing connection section 25 is set to be greater than 0 and less than or equal to 3 mm, so that the connection between the lower plastic layer 24 and the insulating protective layer 23 has a certain sealing width, thereby ensuring the insulating protective performance of the sealing connection section 25.

[0108] According to some embodiments of this application, please refer to Figure 4 and Figure 5 The sealing connection section 25 has a sealing width N, where 1mm ≤ N ≤ 3mm.

[0109] This configuration optimizes the width of the sealing connection section 25 to 1mm to 3mm, so that the sealing connection section 25 has the required insulation protection.

[0110] According to some embodiments of this application, please refer to Figures 4 to 7 The insulating protective layer 23 includes a first insulating portion 231 and a second insulating portion 232, with a sealing crease 233 between the first insulating portion 231 and the second insulating portion 232, and the first insulating portion 231 and / or the second insulating portion 232 are configured to be able to bend around the sealing crease 233.

[0111] Understandably, the first insulating portion 231 and the second insulating portion 232 are different parts of the insulating protective layer 23. The first insulating portion 231 can be used to cover the side of the electrode assembly 22 and separate the side wall of the housing 212 from the side of the electrode assembly 22; the second insulating portion 232 can be used to cover the end face of the electrode assembly 22, for example, it can cover the end face opposite to the end cap 211 and separate the corresponding end face of the inner wall of the housing 212 from the end face of the electrode assembly 22.

[0112] The aforementioned sealing crease 233 refers to a structure between the first insulating portion 231 and the second insulating portion 232, used for folding the first insulating portion 231 or the second insulating portion 232. Understandably, the first insulating portion 231 or the second insulating portion 232 can be folded around the sealing crease 233 to form an angle, thereby allowing the first insulating portion 231 and the second insulating portion 232 to simultaneously cover different sides of the electrode assembly 22.

[0113] The sealing crease 233 refers to a mark that does not penetrate the insulating protective layer 23 and is used to improve the ease of folding. Optionally, the sealing crease 233 may be a continuous groove formed between the first insulating portion 231 and the second insulating portion 232; or, the sealing crease 233 may be an intermittent groove structure formed between the first insulating portion 231 and the second insulating portion 232.

[0114] The first insulating part 231 is used to cover the side of the electrode assembly 22, and the second insulating part 232 is used to cover the end face of the electrode assembly 22 opposite to the end cover 211. At the same time, the insulating protective layer 23 and the lower plastic layer 24 are connected to form a sealed connection section 25, so as to fully separate the electrode assembly 22 from the housing 21. This can effectively increase the creepage distance between the electrode assembly 22 and the housing 21, thereby improving the high voltage breakdown resistance of the housing 21.

[0115] With this configuration, the first insulating part 231 can be used to provide insulation protection for the side of the electrode assembly 22, and the second insulating part 232 can be used to provide insulation protection for the bottom of the electrode assembly 22 after being bent around the sealing crease 233, which effectively improves the insulation protection effect of the insulating protective layer 23 on the electrode assembly 22.

[0116] For example, in some specific embodiments, the battery cell 20 includes a housing 212, an end cap 211, an electrode assembly 22, and an insulating protective film. The electrode assembly 22 is disposed within the receiving cavity 21a of the housing 212, and the tabs of the electrode assembly 22 are electrically connected to the terminals of the end cap 211 via an adapter piece 26. An insulating protective film is covered on the surface of the electrode assembly 22, which completely covers the side surface of the electrode assembly 22 and the end face facing away from the end cap 211. The insulating protective film also extends towards the end cap 211 until it meets the lower plastic film disposed on the inner wall of the end cap 211. Layer 24 is connected; the insulating protective film can be surrounded on the side of the lower plastic layer 24, and the insulating protective film is connected to the lower plastic layer 24 by full heat fusion to form a sealed connection section 25. Specifically, a sealed connection section 25 is formed between the adapter piece 26 and the side wall of each side of the housing 212, thereby increasing the creepage distance between the adapter piece 26 and the electrode assembly 22 and the housing 212, thereby achieving the purpose of improving the breakdown voltage between the housing 21 and the electrode assembly 22, and effectively improving the high voltage breakdown resistance of the housing 21, thereby reducing the probability of the battery cell 20 burning or exploding.

[0117] According to some embodiments of this application, please refer to Figures 2 to 4 This application also provides a battery 100, including a battery cell 20 as described above. The battery 100 uses any of the battery cells 20 described in the above embodiments, which will not be repeated here.

[0118] Based on some embodiments of this application, please continue to refer to Figure 1 and Figure 2 This application also provides an electrical device, including the battery 100 as described above. The electrical device can be any of the electrical devices described in the above embodiments, such as a vehicle 1000, which will not be elaborated further here.

[0119] 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 battery cell, characterized in that, include: The outer casing has a receiving cavity; An electrode assembly disposed within the receiving cavity; as well as An insulating protective layer, the insulating protective layer covering the electrode assembly; The outer casing includes a housing and an end cap. The housing has an opening in the receiving cavity. The end cap covers the opening. A lower plastic layer is provided on the inner surface of the end cap. The lower plastic layer is at least partially connected to at least partially of the insulating protective layer to form a sealing connection segment. The battery cell also includes an adapter piece. The adapter piece is electrically connected to the electrode assembly. At least a portion of the adapter piece is provided with the sealing connection segment between it and the housing. The housing includes several sidewalls. The sealing connection segment is provided between the adapter piece and each of the sidewalls. The adapter piece has an outer edge, which is a ring-shaped side surface of the adapter piece in its thickness direction. The sealing connection segment is configured to block the shortest path from the outer edge to the sidewall. The sealing connection segment is annular and wrapped around the adapter piece. The gap width between the adapter piece and the sealing connection segment is M, where 0 < M ≤ 50 mm. The sealing connection segment has a sealing width N, where 0 < N ≤ 3 mm.

2. The battery cell according to claim 1, characterized in that: The gap width between the adapter plate and the sealing connection section is M, where 3mm ≤ M ≤ 10mm.

3. The battery cell according to claim 1 or 2, characterized in that: The sealed connection section has a sealing width N, where 1mm ≤ N ≤ 3mm.

4. The battery cell according to claim 1 or 2, characterized in that: The insulating protective layer includes a first insulating portion and a second insulating portion, with a sealing crease between the first insulating portion and the second insulating portion, and the first insulating portion and / or the second insulating portion being configured to be able to bend around the sealing crease.

5. A battery, characterized in that: The battery comprises a battery cell as described in any one of claims 1 to 4.

6. An electrical appliance, characterized in that: The electrical equipment includes the battery as described in claim 5.

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