Battery monomer, battery and electric device

Abstract

The utility model discloses a battery monomer, a battery and a power utilization device. The battery monomer comprises a shell and an electrode assembly, the electrode assembly is arranged in the shell, the electrode assembly comprises a positive pole piece and a negative pole piece, each of the positive pole piece and the negative pole piece comprises a main body part and a tab connected to the main body part, and a flame-retardant part is at least arranged in the tab of the positive pole piece and the tab of the negative pole piece, which have the smallest overcurrent sectional area. And the flame-retardant part can also prevent thermal runaway of the battery monomer to a certain extent, and can also cancel a fusing area of the confluence component, so that the overcurrent capability of the battery monomer is improved, the current high-rate charge and discharge requirements on the battery monomer are met, and the reliability of the battery monomer is improved.

Description

Technical Field

[0001] This application relates to the technical field of batteries, and particularly to a battery cell, a battery, and an electrical device. Background Art

[0002] In recent years, with the rapid development of new energy technologies, new energy vehicles have been more and more widely used and gradually replaced traditional fuel vehicles to become one of the mainstream means of transportation. As the power source of new energy vehicles, power batteries are one of the core devices of new energy vehicles. Therefore, the safety performance of power batteries has become the focus of people's attention.

[0003] In the development of battery technologies, how to improve the reliability of battery cells is a research direction in battery technologies. Summary of the Utility Model

[0004] Embodiments of this application provide a battery cell, a battery, and an electrical device, which can improve the reliability of the battery cell.

[0005] In a first aspect, embodiments of this application provide a battery cell. The battery cell includes a housing and an electrode assembly. The electrode assembly is disposed inside the housing. The electrode assembly includes a positive electrode tab and a negative electrode tab. Both the positive electrode tab and the negative electrode tab include a main body portion and a tab connected to the main body portion. A flame retardant portion is provided at least on the tab of the positive electrode tab and the tab of the negative electrode tab with the smallest cross-sectional area for current flow.

[0006] In the above solution, by providing a flame retardant portion at the tab of the positive electrode tab and the tab of the negative electrode tab with the smallest cross-sectional area for current flow, that is, providing a flame retardant portion at the tab with the smallest current carrying capacity, even when fusing occurs at this tab during high-rate discharge, the flame retardant portion can, to a certain extent, prevent the battery cell from experiencing thermal runaway. Moreover, the fusing area of the current collecting component can be eliminated, improving the current carrying capacity of the battery cell, meeting the current high-rate charge and discharge requirements for the battery cell, and improving the reliability of the battery cell.

[0007] In some embodiments, the tab includes a blank area and a flame retardant area. The flame retardant portion is provided in the flame retardant area, and the flame retardant area is provided at a position of the tab close to the main body portion.

[0008] In the above solution, by providing the flame retardant portion at a position of the tab close to the main body portion, if fusing occurs on the side of the flame retardant portion of the tab close to the main body portion, it can, to a certain extent, prevent heat from spreading to the side of the flame retardant portion away from the main body portion (where the area of this part of the tab is larger), further reducing the risk of the battery cell experiencing thermal runaway.

[0009] In some embodiments, the flame retardant area is provided on the side of the blank area close to the main body portion.

[0010] In the above solution, there is no gap between the flame retardant area and the main body, which can prevent the battery cell from thermal runaway to the greatest extent.

[0011] In some embodiments, a preset gap is provided between the flame retardant area and the main body in the width direction of the main body.

[0012] In the above solution, the risk of the flame retardant material in the flame retardant area entering the main body can be reduced, thereby ensuring the energy density of the battery cell to a certain extent.

[0013] In some embodiments, in the width direction of the main body, the distance between the flame retardant area and the main body is D, and D satisfies: 3 mm ≤ D ≤ 10 mm.

[0014] In the above solution, the distance between the flame retardant area and the main body is within a reasonable range, which can not only ensure the energy density of the battery cell to a certain extent, but also further reduce the risk of thermal runaway of the battery cell.

[0015] In some embodiments, D satisfies: 5 mm ≤ D ≤ 7 mm, further ensuring the energy density of the battery cell and reducing the risk of thermal runaway of the battery cell.

[0016] In some embodiments, in the width direction of the main body, the width of the flame retardant area is L1, and the width of the entire tab is L2, and L1 and L2 satisfy: 0.05 ≤ L1 / L2 ≤ 0.3.

[0017] In the above solution, the ratio range of the width of the flame retardant area to the entire tab is reasonable, which can not only ensure the flame retardant effect of the flame retardant area to a certain extent, but also does not affect the function of the tab in transmitting electric energy.

[0018] In some embodiments, L1 and L2 satisfy: 0.05 ≤ L1 / L2 ≤ 0.15, further ensuring the flame retardant effect of the flame retardant area and not affecting the function of the tab in transmitting electric energy.

[0019] In some embodiments, the flame retardant part is continuous along the length direction of the main body, and the flame retardant part is relatively easy to coat, which is convenient for process preparation.

[0020] In some embodiments, the flame retardant part includes a plurality of flame retardant sub-parts, and the plurality of flame retardant sub-parts are arranged at intervals.

[0021] In the above solution, the flame retardant part is discontinuously arranged, and there is still a conductive part of the tab between adjacent flame retardant sub-parts, which can increase the conductive area of the tab.

[0022] In a second aspect, an embodiment of the present application further provides a battery, including the battery cell according to any one of the above embodiments.

[0023] In a third aspect, an embodiment of the present application further provides an electrical device, including the above battery, and the battery is used to provide electrical energy.

[0024] The above description is only an overview of the technical solution of the present application. In order to be able to understand the technical means of the present application more clearly, it can be implemented according to the content of the description. And in order to make the above and other purposes, features and advantages of the present application more obvious and understandable, the specific embodiments of the present application are specifically given below. Description of the Drawings

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required to be used in the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0026] Figure 1 Structural schematic diagram of a vehicle according to some embodiments of the present application;

[0027] Figure 2 Explosion diagram of a battery according to some embodiments of the present application;

[0028] Figure 3 Structural schematic diagram of a battery module according to some embodiments of the present application;

[0029] Figure 4 Exploded structural schematic diagram of a battery cell according to some embodiments of the present application;

[0030] Figure 5 Partial structural schematic diagram of a positive electrode plate or a negative electrode plate according to some embodiments of the present application;

[0031] Figure 6 Structural schematic diagram of an electrode assembly according to some embodiments of the present application;

[0032] Figure 7 Structural schematic diagram of an electrode assembly according to some other embodiments of the present application;

[0033] Figure 8 Partial structural schematic diagram of a positive electrode plate or a negative electrode plate according to some other embodiments of the present application;

[0034] Figure 9 Partial structural schematic diagram of a positive electrode plate or a negative electrode plate according to some other embodiments of the present application;

[0035] Figure 10 Partial structural schematic diagram of a positive electrode plate or a negative electrode plate according to still some other embodiments of the present application.

[0036] Description of the Reference Numerals:

[0037] 1000, Vehicle; 100, Battery; 200, Controller; 300, Motor; 10, Upper Cover; 30, Box Body; 400, Battery Module; 20, Battery Cell; 22, Housing; 21, End Cover; 23, Electrode Assembly; 26, Electrode Terminal; 27, Positive Electrode Plate; 28, Negative Electrode Plate; 40, Main Body; 50, Tab; 51, Blank Area; 52, Flame Retardant Area; 60, Flame Retardant Part. Detailed Embodiment

[0038] The following further describes the embodiments of the present application in detail in conjunction with the accompanying drawings and examples. The detailed description and drawings of the following examples are used to exemplarily illustrate the principle of the present application, but cannot be used to limit the scope of the present application, that is, the present application is not limited to the described embodiments.

[0039] In the description of the present application, it should be noted that unless otherwise specified, the meaning of "a plurality" is two or more; the orientation or positional relationships indicated by the terms "upper", "lower", "left", "right", "inner", "outer", etc. are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present application. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. "Vertical" is not strictly vertical, but within the allowable error range. "Parallel" is not strictly parallel, but within the allowable error range.

[0040] Referring to "embodiment" in the present application means that the specific features, structures or characteristics described in connection with the embodiment can be included in at least one embodiment of the present application. The appearance of this phrase in various positions in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art explicitly and implicitly understand that the embodiments described in the present application can be combined with other embodiments.

[0041] The orientation words appearing in the following description are all the directions shown in the figures, and do not limit the specific structure of the present application. In the description of the present application, it should also be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0042] In this application, the battery cell may include a lithium-ion secondary battery cell, a lithium-ion primary battery cell, a lithium-sulfur battery cell, a sodium-lithium-ion battery cell, a sodium-ion battery cell, a magnesium-ion battery cell, etc., and the embodiments of this application are not limited thereto. The battery cell can be in the shape of a cylinder, a flat body, a cuboid, or other shapes, and the embodiments of this application are not limited thereto either. Generally, battery cells are divided into three types according to the encapsulation method: cylindrical battery cells, square battery cells, and soft-pack battery cells, and the embodiments of this application are not limited thereto either.

[0043] The battery mentioned in the embodiments of this application refers to a single physical module that includes one or more battery cells to provide higher voltage and capacity. For example, the battery mentioned in this application may include a battery module or a battery pack, etc. Generally, a battery includes a box body for encapsulating one or more battery cells. The box body can prevent liquids or other foreign objects from affecting the charging or discharging of the battery cells.

[0044] The embodiments of this application provide an electrical device that uses a battery as a power source. The electrical device can be, but is not limited to, a mobile phone, a tablet computer, a laptop computer, an electric toy, an electric tool, a battery car, an electric vehicle, a ship, a spacecraft, etc. Among them, the electric toy can include a fixed or mobile electric toy. For example, a game console, an electric vehicle toy, an electric ship toy, an electric airplane toy, etc. The spacecraft can include an airplane, a rocket, a space shuttle, a spaceship, etc.

[0045] For the convenience of description in the following embodiments, a vehicle 1000 in an embodiment of this application is taken as an example for illustration.

[0046] Please refer to Figure 1 , Figure 1 which is a schematic structural diagram of a vehicle provided in some embodiments of this application. The vehicle 1000 can be a fuel vehicle, a gas vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle, an extended-range vehicle, etc. A battery 100 is disposed inside the vehicle 1000. The battery 100 can be disposed at the bottom, the head, or the tail of the vehicle 1000. The battery 100 can be used for power supply of the vehicle 1000. For example, the battery 100 can be used as the operating power source of the vehicle 1000. The vehicle 1000 may further 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, it is used for the working power requirements during the start, navigation, and driving of the vehicle 1000.

[0047] In some embodiments of this application, the battery 100 can not only be used as the operating power source of the vehicle 1000, but also as the driving power source of the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0048] Please refer toFigure 2 , Figure 2 An exploded view of a battery provided for some embodiments of the present application. The battery 100 includes a battery case and battery cells 20. In some embodiments, the battery case may include an upper cover 10 and a case body 30. The upper cover 10 and the case body 30 cover each other, and the upper cover 10 and the case body 30 together define a receiving cavity for receiving the battery cells 20. The case body 30 may be a hollow structure with one end open, and the upper cover 10 may be a plate-like structure. The upper cover 10 covers the open side of the case body 30 so that the upper cover 10 and the case body 30 together define the receiving cavity; the upper cover 10 and the case body 30 may also both be hollow structures with one side open, and the open side of the upper cover 10 covers the open side of the case body 30. Of course, the battery case formed by the upper cover 10 and the case body 30 can be in various shapes, such as a cylinder, a cuboid, etc.

[0049] Figure 3 A schematic structural diagram of a battery module for some embodiments of the present application. In the battery 100, there may be multiple battery cells 20. The multiple battery cells 20 can be connected in series, in parallel, or in a mixed connection. A mixed connection means that there are both series and parallel connections among the multiple battery cells 20. The multiple battery cells 20 can be directly connected in series, in parallel, or in a mixed connection together, and then the whole formed by the multiple battery cells 20 is received in the case; of course, the battery 100 can also be in the form that multiple battery cells 20 are first connected in series, in parallel, or in a mixed connection to form battery modules, and then the multiple battery modules are connected in series, in parallel, or in a mixed connection to form a whole and are received in the case. The battery 100 may further include other structures. For example, the battery 100 may further include a busbar component for realizing the electrical connection among the multiple battery cells 20.

[0050] Among them, each battery cell 20 can be a secondary battery cell or a primary battery cell; it can also be a lithium-sulfur battery cell, a sodium-ion battery cell, or a magnesium-ion battery cell, but is not limited thereto. The battery cell 20 can be in the shape of a cylinder, a flat body, a cuboid, or other shapes, etc.

[0051] Please refer to Figure 4 , Figure 4 An exploded structural diagram of a battery cell provided for some embodiments of the present application. The battery cell 20 refers to the smallest unit that makes up a battery. The battery cell 20 includes an end cap 21, a housing 22, an electrode assembly 23, and other functional components.

[0052] The end cap 21 refers to a component that covers the opening of the housing 22 to isolate the internal environment of the battery cell 20 from the external environment. Without limitation, the shape of the end cap 21 can be adapted to the shape of the housing 22 to cooperate with the housing 22. Optionally, the end cap 21 can be made of a material with a certain hardness and strength (such as aluminum alloy). In this way, the end cap 21 is not easily deformed when subjected to extrusion and collision, enabling the battery cell 20 to have higher structural strength and improved safety performance. Functional components such as electrode terminals 26 can be provided on the end cap 21. The electrode terminal 26 can be used for electrical connection with the electrode assembly 23 to output or input the electrical energy of the battery cell 20. In some embodiments, a pressure relief mechanism for releasing the internal pressure when the internal pressure or temperature of the battery cell 20 reaches a threshold can also be provided on the end cap 21. The material of the end cap 21 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application do not make special restrictions on this. In some embodiments, an insulating member can also be provided on the inner side of the end cap 21. The insulating member can be used to isolate the electrical connection components in the housing 22 from the end cap 21 to reduce the risk of short circuit. Exemplarily, the insulating member can be plastic, rubber, etc.

[0053] Currently, the large-current protection method applied inside the battery cell is as follows: a fusing area is provided on the busbar component, which is suitable for fusing at high temperatures to resist problems such as reverse high voltage generated by the battery cell after passing through a large current. The safety of the battery cell is ensured by the fusing of the busbar component. However, the method of providing a fusing area on the busbar component reduces its over-current capacity and cannot meet the current requirements for high-rate charging and discharging of the battery cell.

[0054] To solve the above technical problems, the embodiments of the present application provide a battery cell. The battery cell includes a housing and an electrode assembly. The electrode assembly is disposed inside the housing. The electrode assembly includes a positive electrode tab and a negative electrode tab. Both the positive electrode tab and the negative electrode tab include a main body portion and a tab connected to the main body portion. A flame-retardant portion is provided at least on the tab with the smallest cross-sectional area for current flow among the tabs of the positive electrode tab and the negative electrode tab.

[0055] In the above solution, by providing a flame-retardant portion at the tab with the smallest cross-sectional area for current flow among the tabs of the positive electrode tab and the negative electrode tab, that is, providing a flame-retardant portion at the tab with the smallest over-current capacity, even when a high-rate discharge occurs and fusing occurs at this tab, the flame-retardant portion can, to a certain extent, prevent the battery cell from experiencing thermal runaway. Moreover, the fusing area of the busbar component can be cancelled, improving the over-current capacity of the battery cell, meeting the current requirements for high-rate charging and discharging of the battery cell, and improving the reliability of the battery cell.

[0056] Figure 5 It is a partial structural schematic diagram of the positive electrode tab or the negative electrode tab in some embodiments of the present application.

[0057] As Figure 5 shown, in a first aspect, an embodiment of the present application provides a battery cell 20, which includes a housing 22 and an electrode assembly 23 disposed inside the housing 22. The electrode assembly 23 includes a positive electrode tab 27 and a negative electrode tab 28. Both the positive electrode tab 27 and the negative electrode tab 28 include a main body portion 40 and a tab 50 connected to the main body portion 40. A flame retardant portion 60 is provided at least on the tab 50 of the positive electrode tab 27 and the tab 50 of the negative electrode tab 28 with the smallest current-carrying cross-sectional area.

[0058] The electrode assembly 23 can be formed by winding the positive electrode tab 27, the separator, and the negative electrode tab 28, or by laminating a plurality of positive electrode tabs 27, the separator, and the negative electrode tab 28. The main body portion 40 of the positive electrode tab 27 and the negative electrode tab 28 is coated with an active material, and the portion without the active material coating is sheared to form the tab 50. The tab 50 is located at the end of the main body portion 40, and the area of the tab 50 is smaller than the area of the main body portion 40, and is used to lead out the electric energy of the battery cell 20 to the outside.

[0059] Figure 6 is a schematic structural diagram of an electrode assembly according to some embodiments of the present application; Figure 7 is a schematic structural diagram of an electrode assembly according to some other embodiments of the present application.

[0060] As Figure 6 shown, the flame retardant portion 60 can be provided only on the tab 50 of the positive electrode tab 27 and the tab 50 of the negative electrode tab 28 with the smallest current-carrying cross-sectional area. Or as Figure 7 shown, the flame retardant portion 60 can also be provided on both the tab 50 of the positive electrode tab 27 and the electrode tab 50 of the negative electrode tab 28.

[0061] It should be noted that the current-carrying cross-sectional areas of the tab 50 of the positive electrode tab 27 and the tab 50 of the negative electrode tab 28 respectively refer to: along the thickness direction of the positive electrode tab 27, the total cross-sectional area of all the tabs 50 of the positive electrode tabs 27 of a battery cell 20, and along the thickness direction of the negative electrode tab 28, the total cross-sectional area of all the tabs 50 of the negative electrode tabs 28 of a battery cell 20.

[0062] The materials of the main body portion 40 of the positive electrode tab 27 and the main body portion 40 of the negative electrode tab 28 are different. Generally, the base material of the positive electrode tab 27 is aluminum, and the base material of the negative electrode tab 28 is generally copper.

[0063] Exemplarily, two electrode assemblies 23 are arranged in a battery cell 20. The base material of the positive electrode tab 27 is made of aluminum foil. The number of tabs 50 is 20, the width of the tab 50 is 22 mm, and the thickness is 13 μm. The base material of the negative electrode tab 28 is made of copper foil. The number of negative tabs 50 is 21, the width of the negative tab 50 is 22 mm, and the thickness is 6 μm. Then the current-carrying cross-sectional area of the positive tab 50 is 20 * 0.013 * 2 * 22 = 11.44 mm 2 , and the current-carrying cross-sectional area of the negative tab 50 is 20 * 0.006 * 2 * 22 = 5.8 mm 2 . Therefore, the current-carrying cross-sectional area of the tab 50 of the negative electrode tab 28 is the smallest. The flame retardant part 60 can be provided only at the tab 50 of the negative electrode tab 28, or the flame retardant part 60 can be provided at the tabs 50 of both the negative electrode tab 28 and the positive electrode tab 27.

[0064] The flame retardant part 60 can be prepared by directly coating a flame retardant material on the base material. The flame retardant material can include materials such as polyimide, ammonium polyphosphate, and calcium gluconate.

[0065] During coating, uncoated areas can be provided on both opposite sides of the main body part 40 in the width direction of the main body part 40. The flame retardant material is coated in the uncoated areas to form the flame retardant part 60. Then, it is cut along the length direction of the positive electrode tab 27 or the negative main body part 40, and the tab 50 is cut in the uncoated area. Then, the electrode assembly 23 can be obtained by winding.

[0066] Since the flame retardant part 60 is provided at the tab 50 with the smallest current-carrying cross-sectional area among the tabs 50 of the positive electrode tab 27 and the tabs 50 of the negative electrode tab 28, the melting position after passing a large current is at the position with the smallest current-carrying cross-sectional area. Since the flame retardant part 60 is provided here, problems such as reverse high voltage generated can be prevented, and the melting area of the bus bar component can be cancelled, and the current-carrying capacity of the bus bar component is improved.

[0067] In the above solution, by providing the flame retardant part 60 at the tab 50 with the smallest current-carrying cross-sectional area among the tabs 50 of the positive electrode tab 27 and the tabs 50 of the negative electrode tab 28, that is, providing the flame retardant part 60 at the tab 50 with the smallest current-carrying capacity, even when discharging at a high rate and melting at the tab 50, the flame retardant part 60 can prevent the battery cell 20 from thermal runaway to a certain extent, and the melting area of the bus bar component can also be cancelled, improving the current-carrying capacity of the battery cell 20, meeting the current high-rate charge and discharge requirements of the battery cell 20, and improving the reliability of the battery cell 20.

[0068] In some embodiments, the tab 50 includes a blank area 51 and a flame retardant area 52. The flame retardant part 60 is provided in the flame retardant area 52, and the flame retardant area 52 is provided at a position of the tab 50 close to the main body part 40.

[0069] The blank area 51 is the area where the flame retardant material is not coated, and the flame retardant area 52 is the area where the flame retardant part 60 is provided. The continuous flame retardant part 60 can be provided in the flame retardant area 52, or the discontinuous flame retardant part 60 can be provided in the flame retardant area 52. The flame retardant area 52 can have a certain gap with the main body part 40, or can be provided adjacent to the main body part 40.

[0070] In the above solution, by arranging the flame retardant part 60 at the position of the tab 50 close to the main body part 40, if the tab 50 is melted on the side of the flame retardant part 60 close to the main body part 40, to a certain extent, it can prevent heat from spreading to the side of the flame retardant part 60 away from the main body part 40 (the area ratio of this part in the tab 50 is larger), and further reduce the risk of thermal runaway of the battery cell 20.

[0071] In some embodiments, the flame retardant area 52 is arranged on the side of the blank area 51 close to the main body part 40.

[0072] In the above solution, there is no gap between the flame retardant area 52 and the main body part 40, which can prevent the battery cell 20 from having thermal runaway to the greatest extent.

[0073] Figure 8 It is a partial structural schematic diagram of the positive electrode tab or the negative electrode tab in some other embodiments of the present application.

[0074] As Figure 8 shown, in some embodiments, a preset gap is provided between the flame retardant area 52 and the main body part 40 in the width direction of the main body part 40.

[0075] In the above solution, the risk of the flame retardant material in the flame retardant area 52 entering the main body part 40 can be reduced, thereby ensuring the energy density of the battery cell 20 to a certain extent.

[0076] In some embodiments, in the width direction of the main body part 40, the distance between the flame retardant area 52 and the main body part 40 is D, and D satisfies: 3 mm ≤ D ≤ 10 mm.

[0077] Optionally, the distance D between the flame retardant area 52 and the main body part 40 can be any value from 3 mm to 10 mm. Exemplarily, the distance D between the flame retardant area 52 and the main body part 40 can be 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm.

[0078] In the above solution, the distance between the flame retardant area 52 and the main body part 40 is within a reasonable range, which can not only ensure the energy density of the battery cell 20 to a certain extent, but also further reduce the risk of thermal runaway of the battery cell 20.

[0079] In some embodiments, D satisfies: 5 mm ≤ D ≤ 7 mm.

[0080] Optionally, the distance D between the flame retardant region 52 and the main body portion 40 can be any value between 5 mm and 7 mm. Exemplarily, the distance D between the flame retardant region 52 and the main body portion 40 can be 5 mm, 5.5 mm, 6 mm, 6.5 mm, 7 mm, further ensuring the energy density of the battery cell 20 and reducing the risk of thermal runaway of the battery cell 20.

[0081] In some embodiments, in the width direction of the main body portion 40, the width of the flame retardant region 52 is L1, and the width of the entire tab 50 is L2, and L1 and L2 satisfy: 0.05 ≤ L1 / L2 ≤ 0.3.

[0082] Optionally, L1 / L2 can be any value between 0.05 and 0.3. Exemplarily, L1 / L2 can be 0.05, 0.1, 0.2, 0.25, 0.3.

[0083] In the above solution, the ratio range of the width of the flame retardant region 52 in the entire tab 50 is reasonable, which can ensure the flame retardant effect of the flame retardant region 52 to a certain extent without affecting the function of the tab 50 in transmitting electric energy.

[0084] In some embodiments, L1 and L2 satisfy: 0.05 ≤ L1 / L2 ≤ 0.15.

[0085] Optionally, L1 / L2 can be any value between 0.05 and 0.15. Exemplarily, L1 / L2 can be 0.05, 0.06, 0.07, 0.12, 0.15, further ensuring the flame retardant effect of the flame retardant region 52 and not affecting the function of the tab 50 in transmitting electric energy.

[0086] In some embodiments, the flame retardant portion 60 is continuous along the length direction of the main body portion 40. The flame retardant portion 60 can be rectangular, wavy or other shapes. The continuous flame retardant portion 60 is relatively easy to coat and is convenient for process preparation.

[0087] Figure 9 It is a partial structural schematic diagram of the positive electrode tab or the negative electrode tab in still some other embodiments of the present application; Figure 10 It is a partial structural schematic diagram of the positive electrode tab or the negative electrode tab in still some other embodiments of the present application.

[0088] Please refer to Figure 9 and Figure 10 , in some embodiments, the flame retardant portion 60 includes a plurality of flame retardant sub-portions, and the plurality of flame retardant sub-portions are arranged at intervals. The flame retardant sub-portions can be circular, triangular or other shapes. The flame retardant portion 60 is discontinuously arranged, and there is still a conductive portion of the tab 50 between adjacent flame retardant sub-portions, which can increase the conductive area of the tab 50.

[0089] In a second aspect, an embodiment of the present application further provides a battery 100, including the battery cell 20 of any of the above embodiments.

[0090] In a third aspect, an embodiment of the present application further provides an electrical device, including the above battery 100, and the battery 100 is used to provide electrical energy.

[0091] According to some embodiments of the present application, the present application provides a battery cell 20, which includes a housing 22 and an electrode assembly 23. The electrode assembly 23 is disposed inside the housing 22. The electrode assembly 23 includes a positive electrode tab 27 and a negative electrode tab 28. Both the positive electrode tab 27 and the negative electrode tab 28 include a main body portion 40 and a tab 50 connected to the main body portion 40. At least a flame retardant portion 60 is provided on the tab 50 with the smallest current-carrying cross-sectional area among the tabs 50 of the positive electrode tab 27 and the negative electrode tab 28. The tab 50 includes a blank area 51 and a flame retardant area 52. The flame retardant portion 60 is provided in the flame retardant area 52, and the flame retardant area 52 is provided at a position of the tab 50 close to the main body portion 40.

[0092] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be covered by the scope of the claims and the description of the present application. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized in that, Comprising: A housing; An electrode assembly disposed inside the housing, the electrode assembly including a positive electrode tab and a negative electrode tab, both the positive electrode tab and the negative electrode tab including a main body portion and a tab connected to the main body portion, and a flame retardant portion is provided at least in the tab of the positive electrode tab and the tab of the negative electrode tab with the smallest cross-sectional area for current flow.

2. The battery cell according to claim 1, characterized in that, The tab includes a blank area and a flame retardant area, the flame retardant portion is provided in the flame retardant area, and the flame retardant area is provided at a position of the tab close to the main body portion.

3. The battery cell according to claim 2, wherein, The flame retardant area is provided on a side of the blank area close to the main body portion.

4. The battery cell according to claim 2, wherein, A preset gap is provided between the flame retardant area and the main body portion in a width direction of the main body portion.

5. The battery cell according to claim 4, characterized in that, In a width direction of the main body portion, a distance between the flame retardant area and the main body portion is D, and the D satisfies: 3 mm ≤ D ≤ 10 mm.

6. The battery cell according to claim 5, wherein The D satisfies: 5 mm ≤ D ≤ 7 mm.

7. The battery cell according to claim 2, wherein, In a width direction of the main body portion, a width of the flame retardant area is L1, and a width of the entire tab is L2, and the L1 and L2 satisfy: 0.05 ≤ L1 / L2 ≤ 0.

3.

8. The battery cell according to claim 7, characterized in that, The L1 and L2 satisfy: 0.05 ≤ L1 / L2 ≤ 0.

15.

9. The battery cell according to claim 1, characterized in that, The flame retardant portion is in a continuous shape extending along a length direction of the main body portion.

10. The battery cell according to claim 1, characterized in that, The flame retardant portion includes a plurality of flame retardant sub-portions, and the plurality of flame retardant sub-portions are spaced apart.

11. A battery, characterized in that, Including a battery cell according to any one of claims 1 to 10.

12. An electrical device, characterized in that, Including a battery according to claim 11, the battery being used to provide electrical energy.

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