Battery monomer, battery device and electric equipment

Abstract

The utility model discloses a battery monomer, a battery device and electric equipment, and relates to the technical field of battery devices. The battery device comprises a shell, an electrode assembly and a clamping sleeve, the shell is provided with a containing cavity, and the side wall of the shell is provided with a sunken area sunken towards the interior of the containing cavity; the electrode assembly is installed in the containing cavity, and the sunken area abuts against the electrode assembly. At least part of the clamping sleeve is arranged outside the concave area in a sleeving mode and abuts against the concave area. According to the technical scheme, the problem that the outer-layer pole piece of the electrode assembly in the battery monomer is loosened is solved.

Description

TECHNICAL FIELD

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

[0002] In some battery monomers, the battery monomer includes a shell and an electrode assembly, and the electrode assembly is wound and arranged in the shell. Generally, the battery monomer requires that the interlayer stress of the battery monomer should be in a suitable range. However, after the electrode assembly is wound, the outer electrode sheet is in a relaxed state, and the outer electrode sheet and the shell are not pressed against each other. CONTENT OF THE UTILITY MODEL

[0003] The main purpose of the present application is to provide a battery monomer, a battery device and an electric equipment, which aims to reduce the probability of the outer electrode sheet of the electrode assembly in the battery monomer being relaxed.

[0004] To achieve the above-mentioned purpose, the battery monomer provided by the present application includes a shell, an electrode assembly and a clamping sleeve. The shell has a receiving cavity, and the side wall of the shell has a recessed area recessed towards the inside of the receiving cavity. The electrode assembly is installed in the receiving cavity, and the recessed area abuts against the electrode assembly. At least part of the clamping sleeve is sleeved outside the recessed area and abuts against the recessed area.

[0005] The technical scheme of the present application installs the electrode assembly in the receiving cavity, so that the shell has a good protection effect on the electrode assembly. By arranging the recessed area on the side wall of the shell and sleeving at least part of the clamping sleeve outside the recessed area and abutting against the recessed area, the recessed area of the shell can be deformed and the inner side wall of the recessed area of the shell can abut against the electrode assembly, so as to realize the effect of mutual extrusion of the shell and the electrode assembly, and further make the outer layer of the electrode assembly and the shell have a certain compressive stress, thereby improving the problem of the outer electrode sheet of the electrode assembly in the battery monomer being relaxed. In addition, by arranging the recessed area on the side wall of the shell and sleeving at least part of the clamping sleeve outside the recessed area, the clamping sleeve does not occupy much space after being sleeved outside the shell.

[0006] In an embodiment of the present application, the clamping sleeve is an elastic sleeve.

[0007] In this way, the installation through the connecting piece is reduced, so that the installation efficiency can be improved. In addition, in this way, the clamping sleeve is always in the state of clamping the shell and the shell abutting against the electrode assembly when the electrode assembly is in the charging and discharging state.

[0008] In an embodiment of the present application, the elastic sleeve is a columnar body in an integral structure.

[0009] In this way, the structure of the elastic sleeve is simple, the cost is low, and the installation efficiency is high.

[0010] In an embodiment of the present application, the shell has two opposite end faces, the direction of the perpendicular line of the two end faces is defined as the first direction, the size of the recessed area in the first direction is H1, and the distance between the two end faces is H2, 0.85H2≤H1<H2.

[0011] In this way, the contact area of the shell and the electrode assembly can be increased, so that the solid-state electrolyte in the electrode assembly can be in good contact with the active particles, the resistance can be reduced, and the conductivity can be improved.

[0012] In an embodiment of the present application, the projection of the clamping sleeve on the plane where the end face is located is located within the outer contour of the end face.

[0013] In this way, when the clamping sleeve expands outward during the expansion of the electrode assembly, the size of the clamping sleeve occupying the space outside the battery monomer is reduced, thereby providing a certain expansion amount for the expansion of the battery monomer.

[0014] In an embodiment of the present application, the side wall of the shell further comprises an end portion connecting the end faces; the recessed area is cylindrical, the inner radius of the recessed area is R; the distance between the outer surface of the clamping sleeve and the outer surface of the end portion is L, 0.1R≤L≤0.12R.

[0015] In this way, the clamping sleeve can always be located in the groove structure formed by the recessed area and the portions connecting the two ends thereof during the expansion process, thereby reducing the occupation of excessive space by the clamping sleeve. At the same time, the outer diameter of the end portion of the shell is also reduced, thereby reducing the occupation of excessive space and the processing difficulty of the shell.

[0016] In an embodiment of the present application, the side wall of the shell further comprises an end portion and an arc-shaped transition area, one end of the arc-shaped transition area is connected with the end portion, and the other end is connected with the recessed area.

[0017] In this way, the recessed area and the end portion are not easy to have a sharp corner structure, thereby reducing the stress concentration phenomenon.

[0018] In an embodiment of the present application, the two ends of the arc-shaped transition area are respectively tangent to the end portion and the recessed area.

[0019] In this way, the sharp corner structure is avoided at the connection between the end portion and the arc-shaped transition area and at the connection between the recessed area and the arc-shaped transition area, thereby further reducing the probability of occurrence of the stress concentration phenomenon and improving the strength and service life of the shell.

[0020] In an embodiment of the present application, the arc-shaped transition region comprises a first arc-shaped segment and a second arc-shaped segment, the first arc-shaped segment is connected with the end portion and protrudes in a direction away from the accommodating cavity; one end of the second arc-shaped segment is connected with the first arc-shaped segment and the other end is connected with the recessed region; the second arc-shaped segment is opposite to the protruding direction of the first arc-shaped segment.

[0021] In this way, the number of arc-shaped segments of the arc-shaped transition region is not too large, so that the arc-shaped transition region is convenient to process.

[0022] In an embodiment of the present application, the end portion of the inner wall of the clamping sleeve is arc-shaped, and the arc-shaped surface is at least arranged in abutment with the second arc-shaped segment.

[0023] In this way, the use stability of the battery monomer is further improved, and the service life of the battery monomer is improved.

[0024] The present application also provides a battery device comprising the battery monomer.

[0025] The technical scheme of the present application comprises the battery monomer, and the electrode assembly of the battery monomer is installed in the accommodating cavity of the shell, so that the shell has a good protection effect on the electrode assembly. By arranging the recessed region on the side wall of the shell and at least partially sleeving the clamping sleeve outside the recessed region and abutting against the recessed region, the recessed region of the shell can be deformed and the inner side wall of the recessed region of the shell can abut against the electrode assembly, so that the effect of mutual extrusion of the shell and the electrode assembly is achieved, and a certain compressive stress is generated between the outer layer of the electrode assembly and the shell, thereby improving the problem of relaxation of the outer layer of the electrode assembly in the battery monomer. In addition, by arranging the recessed region on the side wall of the shell and at least partially sleeving the clamping sleeve outside the recessed region, the clamping sleeve does not occupy much space after being sleeved outside the shell.

[0026] The present application also provides a battery device comprising the battery monomer. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the drawings needed in the following embodiment or prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0028] Figure 1 The structure schematic diagram of the vehicle of some embodiments of the present application;

[0029] Figure 2 The exploded structure schematic diagram of the battery device of some embodiments of the present application;

[0030] Figure 3 exploded view of a battery cell for some embodiments of the present application;

[0031] Figure 4 external structure view of a battery cell for some embodiments of the present application;

[0032] Figure 5 for Figure 4 sectional view along A-A.

[0033] BRIEF DESCRIPTION OF DRAWINGS

[0034] 1000, vehicle;

[0035] 100, battery device; 200, controller; 300, motor;

[0036] 10, box; 11, first part; 12, second part;

[0037] 30, battery cell; 301, end cover; 301a, electrode terminal; 302, shell; 3021, recessed area; 3022, end; 3023, arc-shaped transition area; 3023a, first arc-shaped segment; 3023b, second arc-shaped segment; 303, electrode assembly; 303a, tab; 304, clamping sleeve.

[0038] The implementation, functional features and advantages of the present application will be further described with reference to the embodiments in combination with the accompanying drawings. DETAILED DESCRIPTION

[0039] The technical solutions in the embodiments of the present application will be described clearly and completely below in combination with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0040] It should be noted that if the present application involves directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement condition, etc. between components in a certain posture, and if the certain posture changes, the directional indications also change accordingly.

[0041] In addition, if the description of "first", "second", etc. is involved in the embodiments of the present application, the description of "first", "second", etc. is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can be explicitly or implicitly included at least one of the features. In addition, if "and / or" or "and / or" appears throughout the text, it means that the three parallel schemes are included, for example, "A and / or B" includes A scheme, or B scheme, or A and B scheme. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of the ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, nor within the protection scope required by the present application.

[0042] At present, from the development of market situation, the application of power battery is more and more widely. Power battery is not only applied to energy storage power supply system of water power, thermal power, wind power and solar power station, but also widely used in electric bicycle, electric motorcycle, electric vehicle and other electric vehicles, military equipment and aerospace and other fields. With the continuous expansion of the application field of power battery, the demand of its market is also increasing.

[0043] The embodiments of the present application provide a power consumption equipment using a battery device as a power supply. The power consumption equipment can be, but is not limited to, a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, an electric car, an electric vehicle, a ship, a spacecraft, etc. Among them, the electric toy can include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys and electric plane toys, etc. The spacecraft can include airplanes, rockets, space shuttles and spaceships, etc.

[0044] The following embodiments are described for convenience with a power consumption equipment of an embodiment of the present application as an example of vehicle 1000.

[0045] Please refer to Figure 1 , Figure 1A structural schematic diagram of a vehicle 1000 is provided for some embodiments of the present application. The vehicle 1000 can be a fuel vehicle, a gas vehicle, or a new energy vehicle, which can be a pure electric vehicle, a hybrid vehicle, or a range extended vehicle, etc. The vehicle 1000 is internally provided with a battery device 100, which can be arranged at the bottom, head or 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 source 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 the working power demand of the vehicle 1000 during starting, navigation and driving.

[0046] In some embodiments of the present application, the battery device 100 can not only be used as an operating power source of the vehicle 1000, but also be used as a driving power source of the vehicle 1000, instead of or partially instead of fuel or natural gas to provide driving power for the vehicle 1000.

[0047] Please refer to Figure 2 , Figure 2 A disassembly view of the battery device 100 is provided for some embodiments of the present application. The battery device 100 includes battery monomers 30, and can further include a box body 10, the battery monomers 30 being accommodated in the box body 10. The box body 10 is used to provide an accommodation space for the battery monomers 30, and can adopt various structures. In some embodiments, the box body 10 can include a first part 11 and a second part 12, the first part 11 and the second part 12 being mutually covered, and the first part 11 and the second part 12 jointly defining an accommodation space for accommodating the battery monomers 30 and a control module. The second part 12 can be a hollow structure with one end open, and the first part 11 can be a plate-shaped structure, the first part 11 being covered on the open side of the second part 12 to jointly define the accommodation space with the second part 12; the first part 11 and the second part 12 can also be hollow structures with one side open, the open side of the first part 11 being covered on the open side of the second part 12. Of course, the box body 10 formed by the first part 11 and the second part 12 can have various shapes, such as a cylinder, a cuboid, etc.

[0048] Each battery monomer 30 can be a secondary battery or a primary battery; can also be a lithium-sulfur battery, a sodium-ion battery or a magnesium-ion battery, but is not limited thereto. The battery monomer 30 can be in the shape of a cylinder, a flat body, a cuboid or other shapes, etc.

[0049] In the battery device 100, there can be multiple battery cells 30, which can be connected in series, parallel, or in a mixed configuration. A mixed configuration means that multiple battery cells 30 are connected in both series and parallel connections. Multiple battery cells 30 can be directly connected in series, parallel, or in a mixed configuration, and then the entire assembly of the multiple battery cells 30 is housed within the housing 10. Alternatively, the battery device 100 can also be formed by first connecting multiple battery cells 30 in series, parallel, or in a mixed configuration to form a battery cell assembly, and then connecting these battery cell assemblies in series, parallel, or in a mixed configuration to form a whole, which is also housed within the housing 10. The battery device 100 may also include other structures; for example, it may include a busbar component for electrical connection between the multiple battery cells 30.

[0050] Please refer to Figure 3 , Figure 3 This is an exploded structural diagram of a battery cell 30 provided in some embodiments of this application. The battery cell 30 refers to the smallest unit constituting the battery device 100. For example... Figure 3 The battery cell 30 includes an end cap 301, a housing 302, an electrode assembly 303, and other functional components.

[0051] End cap 301 refers to a component that covers the opening of housing 302 to isolate the internal environment of battery cell 30 from the external environment. The shape of end cap 301 can be adapted to the shape of housing 302 to fit it. Optionally, end cap 301 can be made of a material with certain hardness and strength (such as aluminum alloy), so that end cap 301 is not easily deformed under pressure and impact, giving battery cell 30 higher structural strength and improved service life. Functional components such as electrode terminals 301a can be provided on end cap 301. Electrode terminals 301a can be used for electrical connection with electrode assembly 303 to output or input electrical energy to battery cell 30. In some embodiments, end cap 301 can also be provided with a pressure relief mechanism for releasing internal pressure when the internal pressure or temperature of battery cell 30 reaches a threshold. The material of end cap 301 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this application embodiment does not impose special limitations on this. In some embodiments, an insulating element may be provided on the inner side of the end cap 301. The insulating element can be used to isolate the electrical connection components within the housing 302 from the end cap 301 to reduce the risk of short circuits. For example, the insulating element may be made of plastic, rubber, etc.

[0052] The shell 302 is a component for fitting the end cover 301 to form an internal environment of the battery cell 30, wherein the formed internal environment can be used to accommodate the electrode assembly 303, electrolyte and other components. The shell 302 and the end cover 301 can be independent components, and an opening can be provided on the shell 302, and the end cover 301 is fitted to cover the opening to form the internal environment of the battery cell 30. Without limitation, the end cover 301 and the shell 302 can also be integrated, specifically, the end cover 301 and the shell 302 can form a common connecting surface before other components enter the shell, and when it is necessary to seal the internal environment of the shell 302, the end cover 301 is fitted to cover the shell 302. The shell 302 can be various shapes and sizes, such as a cuboid, a cylinder, a hexagonal prism, etc. Specifically, the shape of the shell 302 can be determined according to the specific shape and size of the electrode assembly 303. The material of the shell 302 can 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.

[0053] The electrode assembly 303 is a component where electrochemical reactions occur in the battery cell 30. One or more electrode assemblies 303 can be contained in the shell 302. The electrode assembly 303 is mainly formed by winding or stacking the positive and negative electrode sheets, and a separator is usually provided between the positive and negative electrode sheets. The positive and negative electrode sheets have a portion of active material constituting the main body of the electrode assembly 303, and a portion of the positive and negative electrode sheets without active material each constitutes a tab 303a. The positive and negative tabs can be located at one end of the main body or at two ends of the main body, respectively. During the charging and discharging process of the battery device 100, the positive and negative active materials react with the electrolyte, and the tab 303a connects the electrode terminal 301a to form a current loop.

[0054] Generally, the battery cell 30 requires that the interlayer pressure stress should be within a suitable range for cycle performance, however, after the electrode assembly 303 in some battery cells 30 is wound, the outer electrode sheet is in a relaxed state, and the electrode assembly and the shell 302 are not pressed against each other, i.e., the initial state cannot provide the required pressure demand for cycling, resulting in a decrease in the charge and discharge performance and capacity of the battery cell.

[0055] In order to reduce the relaxed state of the outer electrode sheet of the electrode assembly 303 in the battery cell 30, please refer to Figure 4 and Figure 5The application provides a battery monomer 30, which comprises a shell 302, an electrode assembly 303 and a clamping sleeve 304; the shell 302 has a containing cavity, and the side wall of the shell 302 has a recessed area 3021 which is recessed towards the inside of the containing cavity; the electrode assembly 303 is installed in the containing cavity, and the recessed area 3021 abuts against the electrode assembly 303; at least a part of the clamping sleeve 304 is sleeved outside the recessed area 3021 and abuts against the recessed area 3021.

[0056] The structure of the electrode assembly 303 can refer to the structure of the electrode assembly 303 described above, and will not be described in detail here.

[0057] The shell 302 can be in various shapes and sizes, such as cuboid, cylinder, hexagonal prism, etc. The accommodating cavity of the shell 302 refers to the cavity for accommodating the electrode assembly 303. The shell 302 has an opening for mounting the electrode assembly 303, and the end cover 301 is arranged at the opening, which is used to cover the opening, and then the two ends of the shell 302 connected with the end cover 301 and the end opposite to the end cover 301 are defined as the two ends of the shell 302, and the wall surface connecting the two ends of the shell 302 is the side wall of the shell 302. For example, when the shell 302 is in a cylindrical shape, the two circular planes in the shell 302 are the two end faces of the shell 302, and the wall surface connecting the two circular planes is the side wall of the shell 302. The side wall of the shell 302 has a recessed area 3021, which is recessed towards the inside of the accommodating cavity, and the recessed area 3021 can be arranged only in the middle of the side wall, or arranged in the middle of the side wall and near the end 3022. The shape of the recessed area 3021 can be rectangular, arc-shaped or circular, etc. By arranging the recessed area 3021 on the side wall of the shell 302, the inner wall surface of the recessed area 3021 can be closer to the electrode assembly 303 in the accommodating cavity, and more specifically, the inner wall surface of the recessed area 3021 can be closer to the active area of the electrode assembly 303. The recessed area 3021 can be formed in the shell 302 before the electrode assembly 303 is mounted in the shell 302, in which case the inner cavity size of the shell 302 at the position of the recessed area 3021 can be larger than the size of the electrode assembly 303, so as to facilitate the mounting of the electrode assembly 303 in the shell 302 and reduce the risk of scratching the electrode assembly 303 by the inner wall of the shell 302. Alternatively, the recessed area 3021 can be formed after the electrode assembly 303 is mounted in the shell 302, for example, when the electrode assembly 303 is not mounted, the shell 302 can be in a straight cylinder shape, and the inner diameter size of the straight cylinder is larger than the outer diameter size of the electrode assembly 303, so as to facilitate the assembly of the electrode assembly 303; after the electrode assembly 303 is assembled in the shell 302, the shell 302 can be subjected to extrusion treatment at the position corresponding to at least the active area of the electrode assembly 303, so as to recess the position towards the inside of the accommodating cavity to form the recessed area 3021. It should be noted that at this time, although the position of the shell 302 corresponding to at least the active area of the electrode assembly 303 is formed into the recessed area 3021, the inner wall of the recessed area 3021 is only in contact with the electrode assembly 303, and does not have the effect of extruding each other.

[0058] The clamping sleeve 304 refers to a component for clamping at least the recessed area 3021 of the side wall of the shell 302. The clamping sleeve 304 can be a sleeve structure, which can be made of elastic material, so as to realize the clamping effect on the shell 302 by the elastic force of the clamping sleeve 304, and thus deform the position of the shell 302 corresponding to the clamping sleeve 304 and exert pressure on the electrode assembly 303. Alternatively, the clamping sleeve 304 can include two half-ring shells, which can be connected by a connecting piece, so as to realize the clamping effect of the inner surface of the recessed area 3021 of the side wall of the shell 302 on the electrode assembly 303 by the pre-tightening force of the connecting piece. Alternatively, the clamping sleeve 304 includes at least two arc-shaped shells, which are arranged along the circumference of the side wall of the shell 302, i.e., the at least two arc-shaped shells surround the periphery of the side wall of the shell 302, and the adjacent two arc-shaped shells are elastically connected by elastic members. When the clamping sleeve 304 is sleeved on the shell 302, it can wrap the entire shell 302 or only part of the side wall of the shell 302.

[0059] The technical scheme of the present application can realize the clamping effect of the shell 302 on the electrode assembly 303 by installing the electrode assembly 303 in the accommodating cavity. By arranging the recessed area 3021 on the side wall of the shell 302 and sleeving at least part of the clamping sleeve 304 on the outside of the recessed area 3021 and abutting against the recessed area 3021, the recessed area 3021 of the shell 302 can be deformed and abut against the electrode assembly 303, so as to realize the mutual extrusion effect of the shell 302 and the electrode assembly 303, and thus improve the problem of relaxation of the outer layer of the electrode assembly 303 in the battery monomer 30. In addition, by arranging the recessed area 3021 on the side wall of the shell 302 and sleeving at least part of the clamping sleeve 304 on the outside of the recessed area 3021, the clamping sleeve 304 does not occupy much space after being sleeved on the shell 302.

[0060] In an embodiment of the present application, the clamping sleeve 304 is an elastic sleeve.

[0061] The elastic sleeve can be a sleeve structure made of elastic material, or the elastic sleeve can be a sleeve structure in which a plurality of rigid pieces are arranged around the periphery of the side wall of the shell 302, and the adjacent two rigid pieces are elastically connected by elastic members.

[0062] By setting the clamping sleeve 304 as an elastic sleeve, the elastic sleeve can be quickly sleeved outside the shell 302 in an expanded state, reducing the installation through the connecting piece, thereby improving the installation efficiency. In addition, by thus setting, the elastic sleeve can be expanded and contracted, for example, the elastic sleeve automatically clamps the shell 302 in the contraction process, thereby automatically adapting to the contraction of the electrode assembly 303 during discharging; and in the expansion state during charging of the electrode assembly 303, the clamping sleeve 304 can be automatically expanded to adapt to the expansion amount of the electrode assembly 303, so as to ensure that the clamping sleeve 304 is always in the state of clamping the shell 302 and the shell 302 is always in contact with the electrode assembly 303.

[0063] In an embodiment of the present application, please refer to Figure 4 and Figure 5 , the elastic sleeve is a columnar body in an integral structure.

[0064] When the elastic sleeve is a columnar body in an integral structure, that is, the material of the elastic sleeve is selected from elastic materials such as rubber and silica gel.

[0065] By setting the elastic sleeve as a columnar body in an integral structure, the structure of the elastic sleeve is simple, the cost is low, and the installation efficiency is high.

[0066] As shown in Figure 5 , in an embodiment of the present application, the shell 302 has two opposite end faces, the direction of the perpendicular line of the two end faces is defined as the first direction, the size of the recessed area 3021 in the first direction is H1, and the distance between the perpendicular lines of the two end faces is H2, 0.85H2≤H1<H2.

[0067] When the shell 302 is a cylinder, the two opposite end faces of the shell 302 refer to two opposite circular planes. The first direction is the direction of the perpendicular line of the two end faces, that is, the axial direction of the cylinder, that is, the height direction of the cylinder. The size H1 of the recessed area 3021 in the first direction can be 0.85 times, 0.86 times, 0.87 times, 0.88 times, 0.89 times, 0.90 times, 0.91 times, 0.92 times, 0.93 times, 0.94 times, 0.95 times, 0.96 times, 0.97 times, 0.98 times, or 0.99 times of the distance H2 between the perpendicular lines of the two end faces, etc.

[0068] By setting the relationship between the size H1 of the recessed area 3021 in the first direction and the distance H2 between the perpendicular lines of the two end faces as 0.85H2≤H1<H2, the contact area of the shell 302 and the electrode assembly 303 can be improved, so as to ensure that the solid-state electrolyte in the electrode assembly 303 is in good contact with the active particles, reduce the resistance, and thereby improve the conductivity.

[0069] As shown in Figure 5As shown, in one embodiment of this application, the projection of the clamping sleeve 304 on the plane where the end face is located is within the outer contour of the end face.

[0070] It is understandable that when the side wall of the housing 302 has a recessed area 3021, the recessed area 3021 and the parts connected to its two ends together form a groove structure.

[0071] By placing the projection of the clamping sleeve 304 on the plane of the end face within the outer contour of the end face, the outer surface of the clamping sleeve 304 is placed within the groove structure formed by the recessed area 3021 and the connection between its two ends, and is misaligned with the opening of the groove. As a result, when the clamping sleeve 304 expands outward during the expansion of the electrode assembly 303, the size of the clamping sleeve 304 occupying space other than the battery cell 30 is reduced, thereby providing a certain amount of expansion for the expansion of the battery cell 30.

[0072] like Figure 5 As shown, in one embodiment of this application, the sidewall of the housing 302 further includes an end 3022 for connecting the end face; the recessed area 3021 is cylindrical, and the inner radius of the recessed area 3021 is R; the distance between the outer surface of the clamping sleeve 304 and the outer surface of the end 3022 is L, 0.1R≤L≤0.12R.

[0073] Specifically, L can be 0.1R, 0.11R, or 0.12R, as long as L is within the range of 0.1R≤L≤0.12R.

[0074] The expansion amount of electrode assembly 303 is typically 10% of its own outer diameter, that is, the expansion amount of electrode assembly 303 is typically 0.1 times the inner radius R of recessed region 3021.

[0075] By limiting the distance L between the outer surface of the clamping sleeve 304 and the outer surface of the end 3022 to L≥0.1R, it can be ensured that the clamping sleeve 304 is always within the groove structure formed by the recessed area 3021 and the parts connected to its two ends during the expansion process, thereby reducing the situation where the clamping sleeve 304 occupies too much space.

[0076] In addition, by limiting the distance L between the outer surface of the clamping sleeve 304 and the outer surface of the end 3022 to L≤0.12R, the situation where the outer diameter of the end 3022 of the housing 302 is too large and occupies too much space can be reduced, and the processing difficulty of the housing 302 can also be reduced.

[0077] like Figure 5 As shown, in one embodiment of this application, the sidewall of the housing 302 further includes an end portion 3022 and an arc-shaped transition region 3023, one end of which is connected to the end portion 3022 and the other end is connected to the recessed region 3021.

[0078] End portion 3022 refers to the part of the side wall of housing 302 near the end face of housing 302. It can be understood that housing 302 has two ends, and the side wall of housing 302 can have two end portions 3022, each located near one end face of housing 302. When housing 302 is a cylinder, end portion 3022 is annular; when housing 302 is a cuboid, end portion 3022 is a cylindrical body formed by four rectangles.

[0079] The arc-shaped transition area 3023 refers to the area located between the end 3022 and the recessed area 3021. The projection of the arc-shaped transition area 3023 onto the plane perpendicular to the end face of the shell 302 is arc-shaped. The arc-shaped transition area 3023 can be one arc segment, two arc segments, or even three or four segments. When the end 3022 is located at both ends of the side wall of the shell 302, there can also be two arc-shaped transition areas 3023. That is, the side wall of the shell 302, in the direction perpendicular to the end face of the shell 302, has a recessed area 3021 in its middle. The two ends of the recessed area 3021 are respectively connected to two arc-shaped transition areas 3023, and the side of each arc-shaped transition area 3023 away from the recessed area 3021 is connected to the end 3022.

[0080] By setting the end 3022 and the arc transition area 3023, it is not easy for sharp corner structures to appear between the recessed area 3021 and the end 3022, thereby reducing the phenomenon of stress concentration.

[0081] like Figure 5 As shown, in one embodiment of this application, the two ends of the arc-shaped transition region 3023 are respectively tangent to the end 3022 and the recessed region 3021.

[0082] By setting the two ends of the arc-shaped transition region 3023 tangent to the end 3022 and the recessed region 3021 respectively, the transition from the end 3022 to the arc-shaped transition region 3023 and the transition from the recessed region 3021 to the arc-shaped transition region 3023 are both smooth. This avoids sharp corner structures at the connection between the end 3022 and the arc-shaped transition region 3023 and the connection between the recessed region 3021 and the arc-shaped transition region 3023, further reducing stress concentration and improving the strength and service life of the shell 302.

[0083] like Figure 5 As shown, in one embodiment of this application, the arc-shaped transition region 3023 includes a first arc-shaped segment 3023a and a second arc-shaped segment 3023b. The first arc-shaped segment 3023a is connected to the end 3022 and protrudes in a direction away from the receiving cavity. One end of the second arc-shaped segment 3023b is connected to the first arc-shaped segment 3023a, and the other end is connected to the recessed region 3021. The protrusion direction of the second arc-shaped segment 3023b is opposite to that of the first arc-shaped segment 3023a.

[0084] This design ensures that the number of arc segments in the arc transition region 3023 is not too large, thus making the arc transition region 3023 easier to process; in addition, it also ensures that the arc transition region 3023 does not protrude beyond the outer periphery of the surface where the end 3022 is located, thereby reducing the space occupied by the arc transition region 3023.

[0085] like Figure 2 As shown, in one embodiment of this application, the end 3022 of the inner wall of the clamping sleeve 304 is an arc surface, and the arc surface is at least in contact with the second arc segment 3023b.

[0086] By setting the inner end 3022 of the clamping sleeve 304 as an arc surface, and the arc surface is at least in contact with the second arc segment 3023b, the arc surface will evenly distribute the pressure along the arc transition area 3023 of the housing 302. This not only tightly wraps the arc transition area 3023 of the housing 302, but also adapts to the slight dimensional deviations that the housing 302 may have, ensuring that the clamping sleeve 304 always maintains a stable contact with the housing 302, further improving the stability of the battery cell 30 and increasing the service life of the battery cell 30.

[0087] This application also proposes a battery device 100. For example... Figure 1 As shown, the battery device 100 includes a battery cell 30. The specific structure of the battery cell 30 is as described in the above embodiments. Since this electrical device adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0088] This application also proposes an electrical appliance. For example... ​ As shown, the electrical device includes a battery device 100. The specific structure of the battery device 100 is as described in the above embodiments. Since this electrical device adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be repeated here. Specifically, the electrical device can be any of the aforementioned devices or systems that use the battery device 100.

[0089] The above are merely exemplary embodiments of this application and do not limit the patent scope of this application. Any equivalent structural transformations made based on the technical concept of this application and the contents of the specification and drawings of this application, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this application.

Claims

1. A battery cell, characterized by, The battery cell comprises: a housing having a receiving cavity, a side wall of the housing having a recessed area recessed towards an inside of the receiving cavity; an electrode assembly installed in the receiving cavity, the recessed area abutting the electrode assembly; and a clamping sleeve, at least a portion of the clamping sleeve being sleeved outside the recessed area and abutting the recessed area. The clamping sleeve is a resilient sleeve.

2. The battery cell of claim 1, wherein, The resilient sleeve is a columnar body of an integral structure.

3. The battery cell of claim 2, wherein, The housing has two opposite end faces, a direction of a perpendicular line of the two end faces being a first direction, a size of the recessed area in the first direction being H1, a distance between the two end faces being H2, and 0.85H2≤H1<H2.

4. The battery cell according to any one of claims 1 to 3, wherein A projection of the clamping sleeve on a plane in which the end faces are located is located within an outer contour of the end faces.

5. The battery cell of claim 4, wherein the cathode comprises a lithium metal oxide. The side wall of the housing further comprises end portions connecting the end faces; the recessed area is cylindrical, an inner radius of the recessed area being R; a distance between an outer surface of the clamping sleeve and an outer surface of the end portion is L, and 0.1R≤L≤0.12R.

6. The battery cell of claim 5, wherein, The side wall of the housing further comprises:

7. The battery cell according to any one of claims 1 to 3, wherein an end portion; and an arc-shaped transition area, one end of the arc-shaped transition area being connected to the end portion and the other end being connected to the recessed area. The two ends of the arc-shaped transition area are respectively tangent to the end portion and the recessed area.

8. The battery cell of claim 7, wherein the cathode comprises a lithium metal oxide. The arc-shaped transition area comprises:

9. The battery cell of claim 7, wherein the cathode comprises a lithium metal oxide. a first arc-shaped segment, the first arc-shaped segment being connected to the end portion and being convex in a direction away from the receiving cavity; and a second arc-shaped segment, one end of the second arc-shaped segment being connected to the first arc-shaped segment and the other end being connected to the recessed area; the second arc-shaped segment being opposite to the convex direction of the first arc-shaped segment. An end portion of an inner wall of the clamping sleeve is an arc surface, the arc surface being at least in contact with the second arc-shaped segment.

10. The battery cell of claim 9, wherein the cathode comprises a lithium metal oxide. The battery device comprises the battery cell as claimed in any one of claims 1 to 10.

11. A battery device characterized by comprising: The battery device comprises the battery cell as claimed in claim 11.

12. An electrical device, characterized by ​

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