Battery cell, battery device and electric device

Abstract

The utility model discloses a battery monomer, a battery device and a power utilization device. The battery monomer comprises a shell, an electrode assembly and an electrode terminal, and the shell is provided with an electrode lead-out hole; the electrode assembly is arranged in the shell and comprises a main body part and a tab led out from the end part of the main body part; the electrode terminal comprises a connecting part and a terminal main body, the terminal main body protrudes out of the connecting part and is at least partially accommodated in the electrode lead-out hole, the connecting part and the tab are welded to form a welding mark, a groove is formed in one side, deviating from the terminal main body, of the connecting part, and the groove is arranged close to the welding mark. The risk that the shell is burnt and damaged by high temperature is reduced, and the reliability of the single battery is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery, in particular to a battery monomer, a battery device and a power consumption device. BACKGROUND

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

[0003] In the development of battery technology, how to improve the reliability of the battery monomer is a research direction in the battery technology. UTILITY MODEL CONTENT

[0004] The present application provides a battery monomer, a battery device and a power consumption device, which can improve the reliability of the battery monomer.

[0005] In a first aspect, the embodiments of the present application provide a battery monomer, which comprises a shell, an electrode assembly and an electrode terminal, the shell has an electrode lead-out hole; the electrode assembly is arranged in the interior of the shell, and the electrode assembly comprises a main body part and a tab led out from the end of the main body part; the electrode terminal comprises a connecting part and a terminal main body, the terminal main body protrudes from the connecting part and is at least partially accommodated in the electrode lead-out hole, the connecting part is welded with the tab to form a welding mark, the connecting part is provided with a groove on the side away from the terminal main body, and the groove is arranged close to the welding mark.

[0006] In the above scheme, by arranging the groove on the side of the connecting part away from the terminal main body and arranging the groove close to the welding mark, even if there is no adapter between the tab and the terminal main body, the heat generated by direct welding will be partially dissipated in the air in the groove, reducing the heat transferred to other positions of the connecting part, thereby reducing the heat transferred to the shell through the electrode terminal, reducing the risk of high temperature burning and damaging the shell, and improving the reliability of the battery monomer.

[0007] In some embodiments, the battery monomer further comprises a sealing member arranged around the terminal main body, and at least part of the sealing member is clamped between the end cover and the connecting part.

[0008] In the above scheme, the sealing member can enhance the sealing effect between the shell and the electrode terminal, reduce the probability of battery monomer liquid leakage, and further improve the reliability of the battery monomer.

[0009] In some embodiments, in the thickness direction of the connecting part, the projection of at least part of the groove is located between the projection of the sealing member and the projection of the welding mark.

[0010] The groove is arranged between the welding mark and the sealing element, so that the risk of burn damage of the sealing element caused by high temperature is reduced, and the reliability of the battery cell is further improved.

[0011] In some embodiments, the number of grooves is multiple, and the multiple grooves are arranged at intervals.

[0012] In the above scheme, by increasing the number of grooves and arranging multiple grooves at intervals, the heat transferred to the shell can be further reduced.

[0013] In some embodiments, the connecting part includes a first connecting subpart and a second connecting subpart, the first connecting subpart corresponds to the terminal body, and the second connecting subpart is located at the outer periphery of the first connecting subpart, the second connecting subpart is welded with the tab, and the thickness of the second connecting subpart is greater than that of the first connecting subpart.

[0014] In the above scheme, the second connecting subpart welded with the tab is arranged to be thicker, which can reduce the internal resistance of the second connecting subpart, reduce the heat generation, and to a certain extent, prevent the shell from being damaged by burning.

[0015] In some embodiments, the cross-sectional area of the connecting part is S, and S satisfies: 100mm 2 ≤S≤1000mm 2 .

[0016] In the above scheme, by increasing the cross-sectional area of the connecting part, the size of the connecting part can be increased, thereby reducing the impedance, reducing the heat generation during welding, and reducing the risk of burning the shell.

[0017] In some embodiments, S satisfies: 500mm 2 ≤S≤700mm 2 .

[0018] In the above scheme, by further limiting the range of the cross-sectional area of the connecting part, the risk of burning the shell can be reduced, and the space inside the battery cell will not be occupied too much, and the energy density of the battery cell will not be affected.

[0019] In some embodiments, the diameter of the terminal body is R, and R satisfies: 5mm≤R≤30mm.

[0020] In the above scheme, by increasing the diameter of the terminal body, the impedance can be reduced, the heat generation during welding can be reduced, and the risk of burning the shell can be reduced.

[0021] In some embodiments, R satisfies: 15mm≤R≤20mm.

[0022] In the above scheme, by further limiting the diameter of the terminal body, the risk of burning the shell can be reduced, and the space of the shell will not be occupied too much, and the arrangement of other components will not be hindered.

[0023] In some embodiments, the diameter of the terminal body is R, the volume of the connecting portion is V, R and V satisfy: 20mm 2 ≤V / R≤150mm 2 .

[0024] In the above scheme, by limiting the ratio of the volume of the connecting portion to the diameter of the terminal body, the connecting portion and the terminal body are both in a suitable size, which can reduce the heat transferred to the shell and does not affect the electrical conduction efficiency of the electrode terminal.

[0025] In some embodiments, R and V satisfy: 80mm 2 ≤V / R≤100mm 2 .

[0026] In the above scheme, the size ratio of the connecting portion and the terminal body is further limited, which further reduces the heat transferred to the shell and to a certain extent guarantees the electrical conduction efficiency of the electrode terminal.

[0027] In a second aspect, the embodiments of the present application further provide a battery device, which comprises the battery monomer of any of the above embodiments.

[0028] In a third aspect, the embodiments of the present application further provide a power consuming device, which comprises the battery device, and the battery device is used to provide electric energy.

[0029] The above description is only a summary of the technical solutions of the present application. In order to make the technical means of the present application more clear, the embodiments of the present application can be implemented according to the content of the description, and in order to make the above and other purposes, characteristics and advantages of the present application more obvious and easy to understand, the following will be the specific embodiments of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0030] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments of the present application. Obviously, the drawings described below are only some embodiments of the present application, and other drawings can be obtained by the drawings without paying creative labor for the person skilled in the art.

[0031] Figure 1 The schematic diagram of the vehicle of some embodiments of the present application;

[0032] Figure 2 The structural schematic diagram of the battery of some embodiments of the present application;

[0033] Figure 3 The structural schematic diagram of the battery module shown in the figure; Figure 2

[0034] Figure 4 ​A schematic exploded view of a battery cell according to some embodiments of the present application;

[0035] Figure 5 A schematic exploded view of an end cap and an electrode terminal according to some embodiments of the present application;

[0036] Figure 6 A schematic view of an electrode terminal according to some embodiments of the present application;

[0037] Figure 7 A schematic view of an electrode terminal according to some embodiments of the present application from another angle;

[0038] Figure 8 A schematic view of an electrode terminal according to some other embodiments of the present application.

[0039] In the drawings, the drawings are not drawn according to the actual proportions.

[0040] Explanation of reference signs:

[0041] 1000, vehicle; 100, battery; 200, controller; 300, motor; 30, box; 10, upper cover; 400, battery module; 20, battery cell; 22, housing; 21, end cap; 211, cap body; 212, insulating member; 24, outer shell; 241, electrode lead-out hole; 26, electrode terminal; 23, electrode assembly; 231, main body portion; 232, tab; 261, connecting portion; 262, terminal body; 263, solder mark; 264, groove; 265, first connecting sub-portion; 266, second connecting sub-portion; 50, sealing member; X, thickness direction. DETAILED DESCRIPTION

[0042] The embodiments of the present application will be described in further detail below with reference to the accompanying drawings and embodiments. The detailed description and drawings of the following embodiments are used to exemplarily illustrate the principles of the present application, but cannot be used to limit the scope of the present application, i.e., the present application is not limited to the described embodiments.

[0043] In the description of the present application, it should be noted that, unless otherwise specified, the meaning of "a plurality of" is two or more; the orientations or positional relationships indicated by the terms "upper", "lower", "left", "right", "inner", "outer" and the like are merely for the purpose of facilitating the description of the present application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third", etc. are only for the purpose of description and cannot be understood as indicating or implying relative importance. "Vertical" is not strictly vertical, but within the allowable range of error. "Parallel" is not strictly parallel, but within the allowable range of error.

[0044] Reference to an "embodiment" in this application means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily mutually exclusive of one another. It is expressly understood that that the embodiments described herein with the aid of the drawings are merely examples and that the claims are intended to cover all possible embodiments.

[0045] The directional terms appearing in the following description are relative to the directions shown in the drawings and are not intended to limit the specific structure of the application. In the description of the application, it should also be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting" should be interpreted broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

[0046] In the present application, the battery cell can include a lithium ion secondary battery cell, a lithium ion primary battery cell, a lithium-sulfur battery cell, a sodium lithium ion battery cell, a sodium ion battery cell, or a magnesium ion battery cell, etc. The embodiments of the present application are not limited thereto. The battery cell can be in the shape of a cylinder, a flat body, a cuboid, or other shapes, etc. The embodiments of the present application are also not limited thereto. The battery cell is generally divided into three types according to the packaging method: cylindrical battery cells, square battery cells, and soft package battery cells, etc. The embodiments of the present application are also not limited thereto.

[0047] The battery device mentioned in the embodiments of the present application can include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly can include a plurality of battery cells connected in series, in parallel, or in a mixed connection through a busbar component.

[0048] In some embodiments, the battery cell assembly is generally formed by arranging a plurality of battery cells; as an example, the battery cell assembly can be a battery module, which is formed by arranging and fixing a plurality of battery cells into an independent module. As an example, the battery module can be formed by bundling a plurality of battery cells with a cable tie.

[0049] In some embodiments, the battery device can be a battery pack, which includes a box body and one or more battery cell assemblies, and the battery cell assemblies are accommodated in the box body.

[0050] As an example, the battery cell assembly can be a battery module, and the battery cell assembly can be accommodated in the box body by fixing the battery module in the box body.

[0051] As an example, the battery cell assembly can also be accommodated in the box body by directly fixing a plurality of battery cells in the box body.

[0052] The embodiments of the present application provide a power consumption device using a battery as a power supply. The power consumption device can be, but is not limited to, a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, an electric vehicle, an electric automobile, a ship, a spacecraft, and the like. The electric toy can include a fixed or mobile electric toy, such as a game console, an electric automobile toy, an electric ship toy, an electric aircraft toy, and the like. The spacecraft can include an airplane, a rocket, a space shuttle, a spacecraft, and the like.

[0053] The following embodiments are described by taking a power consumption device of an embodiment of the present application as a vehicle 1000 for example for convenience of description.

[0054] Please refer to Figure 1 , Figure 1 A structural schematic diagram of a vehicle is provided for some embodiments of the present application. The vehicle 1000 can be a fuel automobile, a gas automobile, or a new energy automobile, which can be a pure electric automobile, a hybrid electric automobile, or a range extended automobile. The vehicle 1000 is internally provided with a battery device 100, which can be arranged at the bottom, the head, or the tail of the vehicle 1000. The battery device 100 can be used for power supply of the vehicle 1000, for example, the battery device 100 can be used as an operating power supply of the vehicle 1000. The vehicle 1000 can further include a controller 200 and a motor 300, the controller 200 being used to control the battery device 100 to supply power to the motor 300, for example, for power demand of the vehicle 1000 during starting, navigation, and driving.

[0055] In some embodiments of the present application, the battery device 100 can not only be used as an operating power supply of the vehicle 1000, but also be used as a driving power supply of the vehicle 1000, to replace or partially replace fuel or natural gas to provide driving power for the vehicle 1000.

[0056] Please refer to Figure 2 , Figure 2 An exploded view of the device is provided for some embodiments of the present application. The battery device 100 includes a battery box and a battery monomer 20. In some embodiments, the battery box can include an upper cover 10 and a box 30, the upper cover 10 and the box 30 are mutually covered, and the upper cover 10 and the box 30 jointly define a containing cavity for containing the battery monomer 20. The box 30 can be a hollow structure with one end open, and the upper cover 10 can be a plate-shaped structure, the upper cover 10 being covered on the open side of the box 30 to jointly define the containing cavity with the box 30; the upper cover 10 and the box 30 can also be hollow structures with one side open, and the open side of the upper cover 10 is covered on the open side of the box 30. Of course, the battery box formed by the upper cover 10 and the box 30 can be various shapes, such as a cylinder, a cuboid, and the like.

[0057] Figure 3 A structural schematic diagram of a battery module according to some embodiments of the present application. In the battery device 100, the battery cells 20 can be multiple, and the multiple battery cells 20 can be connected in series, in parallel, or in a mixed manner. The mixed manner means that the multiple battery cells 20 are connected in both series and parallel. The multiple battery cells 20 can be directly connected in series, in parallel, or in a mixed manner, and the whole of the multiple battery cells 20 is accommodated in a box. Of course, the battery device 100 can also be in the form that the multiple battery cells 20 are first connected in series, in parallel, or in a mixed manner to form a battery module 400, and the multiple battery modules 400 are connected in series, in parallel, or in a mixed manner to form a whole, and the whole is accommodated in a box. The battery device 100 can also include other structures. For example, the battery device 100 can also include a current collecting component for realizing electrical connection between the multiple battery cells 20.

[0058] Each battery cell 20 can be a secondary battery cell or a primary battery cell, and 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.

[0059] Please refer to Figure 4 , Figure 4 A disassembled structural schematic diagram of a battery cell according to some embodiments of the present application. The battery cell 20 refers to the smallest unit that constitutes a battery. The battery cell 20 includes a housing, an electrode assembly 23, and other functional components.

[0060] The housing includes an end cover 21 and a shell 22. The end cover 21 refers to a component that covers the opening of the shell 22 to isolate the internal environment of the battery cell 20 from the external environment. Without limitation, the shape of the end cover 21 can be adapted to the shape of the shell 22 to fit the shell 22. Optionally, the end cover 21 can be made of a material with certain hardness and strength (such as aluminum alloy), so that the end cover 21 is not easy to deform when subjected to extrusion and collision, so that the battery cell 20 can have higher structural strength, and the safety performance can also be improved. The end cover 21 can be provided with functional components such as an electrode terminal 26. The electrode terminal 26 can be used for electrical connection with the electrode assembly 23 for output or input of the electrical energy of the battery cell 20. In some embodiments, the end cover 21 can also be provided with a pressure relief mechanism for relieving the internal pressure of the battery cell 20 when the internal pressure or temperature of the battery cell 20 reaches a threshold value. The material of the end cover 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 limitations thereon. In some embodiments, an insulating piece can also be provided on the inner side of the end cover 21. The insulating piece can be used to isolate the electrical connection components in the shell 22 from the end cover 21 to reduce the risk of short circuit. Exemplarily, the insulating piece can be plastic, rubber, etc.

[0061] Currently, the tab and the electrode terminal in some battery monomer are directly welded by laser, without ultrasonic welding the tab and the adapter component, and then laser welding the adapter component and the electrode terminal. When directly welding the tab and the electrode terminal, the high-temperature heat generated is transferred to the shell, which may burn and damage some components of the shell. For example, the high-temperature heat is easy to burn the insulating part of the end cover, causing partial failure of the insulating part, and easy to cause short circuit and other phenomena, reducing the reliability of the battery monomer.

[0062] To solve the above technical problems, the embodiments of the present application provide a battery monomer. By setting a groove on the side of the connecting part away from the terminal body, and the groove is close to the welding mark, even if there is no adapter component between the tab and the electrode terminal body, the heat generated by direct welding will be partially lost in the air of the groove when passing through the groove, reducing the heat transferred to other positions of the connecting part, thereby reducing the heat transferred to the shell through the electrode terminal, reducing the risk of high temperature burning and damaging the shell, and improving the reliability of the battery monomer.

[0063] Figure 5 The exploded view of the end cover and the electrode terminal of some embodiments of the present application; Figure 6 The structure diagram of the electrode terminal of some embodiments of the present application.

[0064] Please refer to Figure 5 and Figure 6 , in the first aspect, the embodiments of the present application provide a battery monomer 20, the battery monomer 20 includes a shell 24, an electrode assembly 23 and an electrode terminal 26, the shell 24 has an electrode lead-out hole 241; the electrode assembly 23 is arranged inside the shell 24, the electrode assembly 23 includes a main body part 231 and a tab 232 led out from the end of the main body part 231; the electrode terminal 26 includes a connecting part 261 and a terminal body 262, the terminal body 262 protrudes from the connecting part 261 and is at least partially contained in the electrode lead-out hole 241, the connecting part 261 is welded with the tab 232 to form a welding mark 263, the connecting part 261 is provided with a groove 264 on the side away from the terminal body 262, and the groove 264 is arranged close to the welding mark 263.

[0065] The shell 24 can include a shell 22 and an end cover 21 arranged on the shell 22, and the electrode lead-out hole 241 can be arranged on the end cover 21 or the shell 22. For the convenience of understanding, the embodiments of the present application are explained and described by taking the electrode lead-out hole 241 arranged on the end cover 21 as an example. The end cover 21 can include a cover body 211 and an insulating part 212, the cover body 211 is a metal part, and the insulating part 212 is arranged on the side facing the electrode assembly 23, and the insulating part 212 can prevent short circuit to a certain extent. The electrode lead-out hole 241 penetrates the cover body 211 and the insulating part 212 in turn.

[0066] The electrode terminal 26 can be integrally formed and made of metal material, and can be electrically conductive. The terminal body 262 protrudes upward relative to the connecting portion 261, and when the electrode terminal 26 is assembled, the terminal body 262 is inserted into the electrode lead-out hole 241 from the side of the end cover 21 toward the electrode assembly 23.

[0067] The connecting portion 261 of the electrode terminal 26 can be rectangular, square, or circular, or other shapes. The terminal body 262 can be cylindrical, square, cuboid, or other irregular shapes. The connecting portion 261 of the electrode terminal 26 can be directly welded to the tab 232 by laser welding without the need for an adapter component. The electrical energy of the electrode assembly 23 is transmitted to the outside through the tab 232, the connecting portion 261, and the terminal body 262 in turn.

[0068] The groove 264 on the connecting portion 261 can be long strip-shaped, arc-shaped, S-shaped, or other shapes. The groove 264 can extend along the length direction or the width direction of the connecting portion 261, as long as the groove 264 is close to the welding mark 263. One groove 264 or multiple grooves 264 can be provided on the connecting portion 261.

[0069] In the above scheme, by providing the groove 264 on the side of the connecting portion 261 away from the terminal body 262, and the groove 264 is close to the welding mark 263, even if there is no adapter component between the tab 232 and the terminal body 262 of the electrode terminal 26, the heat generated by direct welding will be partially dissipated in the air in the groove 264 when passing through the groove 264, reducing the heat transferred to other positions of the connecting portion 261, thereby reducing the heat transferred to the shell 24 through the electrode terminal 26, reducing the risk of high temperature burning and damaging the shell 24, and improving the reliability of the battery monomer 20. For example, by providing the groove 264, the heat transferred to the insulating part 212 of the end cover 21 can be reduced, to some extent to prevent high temperature from burning the insulating part 212.

[0070] Figure 7 Another perspective view of the structure of the electrode terminal of some embodiments of the application.

[0071] As Figure 7 shown, in some embodiments, the battery monomer 20 further comprises a sealing member 50 arranged around the terminal body 262, and at least part of the sealing member 50 is clamped between the end cover 21 and the connecting portion 261.

[0072] The sealing member 50 can be a sealing ring surrounding the outer periphery of the terminal body 262; or the sealing member 50 can include multiple sealing blocks arranged at intervals along the outer periphery of the terminal body 262.

[0073] The sealing member 50 can be made of a compressible material such as rubber or foam. The sealing member 50 is arranged in a compressed state between the end cover 21 and the connecting portion 261.

[0074] In the above scheme, the sealing member 50 can enhance the sealing effect between the shell 24 and the electrode terminal 26, reduce the probability of leakage of the battery monomer 20, and further improve the reliability of the battery monomer 20.

[0075] In some embodiments, in the thickness direction X of the connecting portion 261, the projection of at least part of the groove 264 is located between the projection of the sealing member 50 and the projection of the welding mark 263.

[0076] That is, the orthographic projection of at least part of the groove 264 on the connecting portion 261 is located between the orthographic projection of the sealing member 50 on the connecting portion 261 and the orthographic projection of the welding mark 263 on the connecting portion 261.

[0077] The number of grooves 264 can be multiple, all of the grooves 264 can be arranged between the welding mark 263 and the sealing member 50, or part of the grooves 264 can be arranged between the welding mark 263 and the sealing member 50. The number of grooves 264 can also be one, and part of the groove 264 can be arranged between the welding mark 263 and the sealing member 50, and the remaining part extends to other positions.

[0078] When the connecting portion 261 of the tab 232 and the electrode terminal 26 is welded, a part of the high-temperature heat is lost in the air in the groove 264 when passing through the groove 264, so the heat transmitted to the sealing member 50 is reduced.

[0079] In the above scheme, by arranging the groove 264 between the welding mark 263 and the sealing member 50, the risk of burn damage of the sealing member 50 by high temperature can be reduced, and the reliability of the battery monomer 20 is further improved.

[0080] In some embodiments, the number of grooves 264 is multiple, and the multiple grooves 264 are arranged in a spaced manner.

[0081] In the above scheme, by increasing the number of grooves 264 and arranging the multiple grooves 264 in a spaced manner, the heat transmitted to the shell 24 can be further reduced.

[0082] Figure 8 Structure schematic diagram of the electrode terminal of another embodiment of the present application.

[0083] As Figure 8As shown, in some embodiments, the connecting portion 261 includes a first connecting sub-portion 265 corresponding to the terminal body 262 and a second connecting sub-portion 266 located at the outer periphery of the first connecting sub-portion 265, and the thickness of the second connecting sub-portion 266 is greater than that of the first connecting sub-portion 265.

[0084] The first connecting sub-portion 265 is located below the terminal body 262. In the thickness direction X of the connecting portion 261, the projection of the terminal body 262 can be located within the projection of the first connecting sub-portion 265, or the projection of the terminal body 262 overlaps with the projection of the first connecting sub-portion 265, or the projection of the terminal body 262 coincides with the projection of the first connecting sub-portion 265.

[0085] In the above scheme, the second connecting sub-portion 266 to be welded with the tab 232 is arranged to be thicker, which can reduce the internal resistance of the second connecting sub-portion 266, reduce the heat generation, and to a certain extent, prevent the shell 24 from being damaged by burns.

[0086] In some embodiments, the cross-sectional area of the connecting portion 261 is S, and S satisfies: 100mm 2 ≤S≤1000mm 2 .

[0087] It should be noted that the cross-sectional area of the connecting portion 261 refers to the area in the direction parallel to the end cover 21, i.e., the cross-sectional area in the horizontal direction.

[0088] In some embodiments, S can be any value less than 100mm 2 -1000mm 2 . For example, S can be 100mm 2 , 200mm 2 , 300mm 2 , 400mm 2 , 600mm 2 , 800mm 2 , 900mm 2 , 1000mm 2 , etc.

[0089] In the above scheme, by increasing the cross-sectional area of the connecting portion 261, the size of the connecting portion 261 can be increased, thereby reducing the impedance and reducing the heat generation during welding, and reducing the risk of burns of the shell 24.

[0090] In some embodiments, S satisfies: 500mm 2 ≤S≤700mm 2 .

[0091] In some embodiments, S can be any value less than 500mm 2 -700mm2 For example, S can be 500 mm 2 , 550 mm 2 , 590 mm 2 , 650 mm 2 , 700 mm 2 , etc.

[0092] In the above solution, by further limiting the range of the cross-sectional area of the connecting portion 261, the risk of burning the shell 24 can be reduced, and the space inside the battery monomer 20 is not occupied too much, and the energy density of the battery monomer 20 is not affected.

[0093] In some embodiments, the diameter of the terminal body 262 is R, and R satisfies: 5 mm≤R≤30 mm.

[0094] It should be noted that the terminal body 262 is in a cylindrical shape. If the terminal body 262 is composed of cylinders with different diameters in sequence, the diameter R of the terminal body 262 refers to the average diameter of the terminal body 262.

[0095] Wherein, R can be any value less than 5 mm-30 mm. For example, R can be 5 mm, 7 mm, 10 mm, 26 mm, 30 mm, etc.

[0096] In the above solution, by increasing the diameter of the terminal body 262, the impedance can be reduced, the heat generated during welding can be reduced, and the risk of burning the shell 24 can be reduced.

[0097] In some embodiments, R satisfies: 15 mm≤R≤20 mm.

[0098] Wherein, R can be any value less than 15 mm-20 mm. For example, R can be 15 mm, 16 mm, 17 mm, 18 mm, 19 mm, 20 mm, etc.

[0099] In the above solution, by further limiting the diameter of the terminal body 262, the risk of burning the shell 24 can be reduced, and the space of the shell 24 is not occupied too much, and the arrangement of other components is not affected.

[0100] Of course, in other embodiments, the size of the electrode terminal 26 can also be increased by increasing the thickness of the connecting portion 261 or the height of the terminal body 262.

[0101] In some embodiments, the diameter of the terminal body 262 is R, and the volume of the connecting portion 261 is V, and R and V satisfy: 20 mm 2 ≤V / R≤150 mm 2 .

[0102] Wherein, V / R can be less than 20 mm2 -150mm 2 of any value. For example, V / R can be 20mm 2 , 40mm 2 , 60mm 2 , 90mm 2 , 120mm 2 , 150mm 2 , etc.

[0103] In the above scheme, by limiting the ratio of the volume of the connecting portion 261 to the diameter of the terminal body 262, the connecting portion 261 and the terminal body 262 can be in appropriate sizes, which can reduce the heat transferred to the shell 24 and does not affect the electrical conduction efficiency of the electrode terminal 26.

[0104] In some embodiments, R and V satisfy: 80mm 2 ≤V / R≤100mm 2 .

[0105] wherein V / R can be any value less than 80mm 2 -100mm 2 . For example, V / R can be 80mm 2 , 82mm 2 , 85mm 2 , 90mm 2 , 95mm 2 , 100mm 2 , etc.

[0106] In the above scheme, the size ratio of the connecting portion 261 and the terminal body 262 is further limited, which further reduces the heat transferred to the shell 24 and to a certain extent guarantees the electrical conduction efficiency of the electrode terminal 26.

[0107] In a second aspect, the embodiments of the present application also provide a battery 100 device, which comprises the battery monomer 20 of any of the above embodiments.

[0108] In a third aspect, the embodiments of the present application also provide a power consumption device, which comprises the battery 100 device, and the battery 100 device is used to provide electric energy.

[0109] According to some embodiments of the present application, the present application provides a battery cell 20, the battery cell 20 comprising a housing 24, an electrode assembly 23 and an electrode terminal 26, the housing 24 having an electrode lead-out hole 241; the electrode assembly 23 being arranged inside the housing 24, the electrode assembly 23 comprising a main body part 231 and a tab 232 led out from an end of the main body part 231; the electrode terminal 26 comprising a connecting part 261 and a terminal main body 262, the terminal main body 262 protruding from the connecting part 261 and being at least partially accommodated in the electrode lead-out hole 241, the connecting part 261 being welded with the tab 232 to form a welding mark 263, the connecting part 261 being provided with a groove 264 on a side away from the terminal main body 262, the groove 264 being arranged close to the welding mark 263. The battery cell 20 further comprises a sealing member 50 arranged around the terminal main body 262, at least part of the sealing member 50 being clamped between the end cover 21 and the connecting part 261. In some embodiments, in a thickness direction X of the connecting part 261, a projection of at least part of the groove 264 is located between a projection of the sealing member 50 and a projection of the welding mark 263.

[0110] It should be noted that the embodiments and features of the embodiments in the present application can be combined with each other without conflict.

[0111] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacements for some technical features, but these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery cell, characterized in that, include: The outer casing has electrode lead-out holes; An electrode assembly is disposed inside the housing, the electrode assembly including a main body and tabs extending from an end of the main body; An electrode terminal includes a connecting portion and a terminal body. The terminal body protrudes from the connecting portion and is at least partially accommodated in the electrode lead-out hole. The connecting portion is welded to the electrode tab to form a solder mark. The connecting portion has a groove on the side opposite to the terminal body, and the groove is located close to the solder mark.

2. The battery cell according to claim 1, characterized in that, The battery cell also includes a seal surrounding the terminal body, at least a portion of which is clamped between the housing and the connection portion.

3. The battery cell according to claim 2, characterized in that, Along the thickness direction of the connection, at least a portion of the projection of the groove lies between the projection of the seal and the projection of the solder mark.

4. The battery cell according to claim 1, characterized in that, The number of grooves is multiple, and the multiple grooves are distributed at intervals.

5. The battery cell according to claim 1, characterized in that, The connecting portion includes a first connecting sub-part and a second connecting sub-part. The first connecting sub-part corresponds to the terminal body, and the second connecting sub-part is located on the outer periphery of the first connecting sub-part. The second connecting sub-part is welded to the electrode tab, and the thickness of the second connecting sub-part is greater than the thickness of the first connecting sub-part.

6. The battery cell according to claim 1, characterized in that, The cross-sectional area of ​​the connecting part is S, and S satisfies: 100mm 2 ≤S≤1000mm 2 .

7. The battery cell according to claim 6, characterized in that, The S satisfies: 500mm 2 ≤S≤700mm 2 .

8. The battery cell according to claim 1, characterized in that, The diameter of the terminal body is R, and R satisfies: 5mm≤R≤30mm.

9. The battery cell according to claim 8, characterized in that, The R satisfies: 15mm≤R≤20mm.

10. The battery cell according to claim 1, characterized in that, The diameter of the terminal body is R, and the volume of the connecting part is V, wherein R and V satisfy: 20mm. 2 ≤V / R≤150mm 2 .

11. The battery cell according to claim 10, characterized in that, The R and V satisfy: 80mm 2 ≤V / R≤100mm 2 .

12. A battery device, characterized in that, Includes the battery cell according to any one of claims 1-10.

13. An electrical appliance, characterized in that, Includes the battery device according to claim 12, the battery device being used to provide electrical energy.

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