Battery and electric equipment

Abstract

The utility model belongs to the technical field of batteries, and provides a battery and electric equipment, and the battery comprises a shell, an electrode assembly and a top cover; the shell is provided with an inner cavity; the electrode assembly is installed in an inner cavity of the shell. The top cover is installed on the shell to package the electrode assembly, and a concave part is arranged on the inner wall, facing the inner cavity, of the top cover and / or the shell and used for forming or expanding residual space in the shell. The utility model aims to reduce the pressure of gas on a battery cell and reduce the possible failure risk of the battery cell.

Description

Technical Field

[0001] The present application belongs to the field of battery technology, and in particular relates to a battery and an electrical device. Background Art

[0002] The battery includes a shell and a cell arranged inside the shell. The cell is also called an electrode assembly. During the use of the battery, the electrolyte inside is consumed and a certain amount of gas is generated. The cell is generally arranged inside the shell and is in a closed state. The generation of gas will generate a large pressure inside the shell, thereby causing a large pressure on the cell, increasing the risk of cell structure failure, thereby increasing the risk of causing safety and usage problems. Utility Model Content

[0003] In view of the above problems, the present application provides a battery and electrical equipment, aiming to reduce the pressure of gas on the battery cell and reduce the risk of possible failure of the battery cell.

[0004] To solve the above problems, in a first aspect, the present application provides a battery, comprising

[0005] a housing having an inner cavity;

[0006] an electrode assembly, the electrode assembly being installed in the inner cavity; and

[0007] A top cover is mounted on the shell to encapsulate the electrode assembly, and a recess is provided on the top cover and / or the inner wall of the shell, and the recess is used to form or expand the residual space in the shell. By providing the recess on the top cover and / or the inner wall of the shell, the residual space is formed or increased, so that when the gas is discharged, there is more space to accommodate the gas, which reduces the gas pressure inside the shell, reduces the gas pressure on the battery cell, reduces the risk of failure of the battery cell structure, and reduces the risk of safety accidents of the battery.

[0008] In an embodiment of the first aspect, the recessed portion forms a boss structure on a side of the top cover facing away from the inner cavity. Due to the presence of the boss structure, the depth of the recessed portion does not need to be limited within the thickness range of the top cover, and the volume of the recessed portion can be further increased, that is, the volume of the residual space is increased, thereby further reducing the gas pressure caused by the gas and the impact on the battery cell.

[0009] In an embodiment of the first aspect, a folded portion recessed into the inner cavity is formed on the side wall of the shell near the top cover, and the shell is provided with a folded edge at one end where the top cover is located, and the top cover is at least partially located between the folded portion and the folded edge, and the outer surface of the boss structure is flush with the outer surface of the folded edge or protrudes from the outer surface of the folded edge. The provision of the folded portion provides a good installation platform for the top cover, and the top cover can be installed and covered on the end of the shell without dead angles, and the folded edge is provided, which further ensures the stability and firmness of the top cover installation. The outer surface of the boss structure can be flush with the outer surface of the folded edge, or it can protrude from the outer surface. When it protrudes from the outer surface of the folded edge, the residual space can be well increased. When it is flush with the outer surface of the folded edge, the flatness of the overall appearance of the shell can be maintained, and the placement of the battery can be convenient.

[0010] In an embodiment of the first aspect, the top end of the electrode assembly abuts against the folded portion, the folded portion extends along the circumference of the shell, and the folded portion limits the electrode assembly in the inner cavity from the top. The electrode assembly is limited by the folded portion, which effectively ensures the overall stability of the electrode assembly.

[0011] In an embodiment of the first aspect, a first insulating seal is provided between the top cover and the folded portion, and a second insulating seal is provided between the top cover and the folded edge. The first insulating seal is used to achieve sealing and insulation of the inner cavity of the housing, and the structural assembly is reasonable and has good stability. A second insulating seal is also provided between the top cover and the folded edge to further ensure sealing and insulation.

[0012] In an embodiment of the first aspect, the first insulating gasket and the second insulating gasket are connected to insulate the top cover from the inner wall of the shell. The top cover and the shell are insulated by two gaskets, further ensuring the safety of the battery and the sealing effect.

[0013] In one embodiment of the first aspect, the recessed portion on the inner wall of the shell is a groove, and the groove forms a corresponding protrusion on the outer wall of the shell. The recessed portion provided on the inner wall of the shell is a groove, which can increase the residual space inside the shell. The different shapes of the grooves diversify the implementation methods of increasing the residual space, and can be selectively set according to the use requirements and the specific structure of the shell. Since the groove can form a protrusion on the outer wall of the shell, the residual space is further increased, the air pressure inside the shell is reduced, and the pressure on the electrode assembly is reduced.

[0014] In an embodiment of the first aspect, the recessed portion on the inner wall of the shell is a groove, the number of the grooves is multiple, the multiple grooves extend along the axial direction of the shell and are evenly spaced in the circumferential direction of the shell; or

[0015] The plurality of grooves extend along the circumference of the housing and are evenly spaced in the axial direction of the housing; or

[0016] The plurality of grooves are arranged in a scattered pattern. The specific arrangement of the grooves is provided so that the grooves are arranged reasonably and evenly, so that the overall appearance of the housing is reasonable and neat, and the arrangement of multiple grooves can effectively increase the residual space.

[0017] In an embodiment of the first aspect, the recessed portion on the inner wall of the shell is a groove, and the groove is arranged in a spiral form on the shell. A groove arranged in a spiral form is provided, and a corresponding convex portion in a spiral form can also be formed on the outer wall of the shell. The spiral groove forms a connected groove body in the entire length direction of the shell, which can accommodate gas at various places inside the shell and effectively relieve the gas pressure inside the shell.

[0018] In one embodiment of the first aspect, an insulating pad is provided on the surface of the housing;

[0019] The insulating pad covers the raised portion;

[0020] Alternatively, the protrusion is flush with the surface of the insulating pad. The provision of the protrusion does not reduce the energy density of the battery, and achieves the effect of increasing the residual space.

[0021] In an embodiment of the first aspect, the recessed portion is integrally formed with the top cover and / or the housing, which simplifies the processing technology, and the integral forming also makes the design of the recessed portion easier to control so that it can be formed into a desired size and shape.

[0022] The present application also provides an electrical device equipped with the battery provided in any of the above embodiments. Since the residual space of the battery is increased, it can accommodate more gas. When there is a certain amount of gas, it is equivalent to appropriately reducing the gas pressure of the residual space, which can maintain the stability of the battery, thereby ensuring the stability of the electrical device.

[0023] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Moreover, the same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0025] Figure 1 A schematic diagram of the structure of a vehicle according to some embodiments of the present application;

[0026] Figure 2 A schematic diagram of the structure of a battery in some embodiments of the present application;

[0027] Figure 3 for Figure 2 Schematic diagram of the cross-sectional structure along the axial direction;

[0028] Figure 4 for Figure 3 Schematic diagram of the local structure;

[0029] Figure 5 for Figure 4 A schematic diagram of the enlarged structure at A in the middle;

[0030] Figure 6 A schematic diagram of the structure of a battery in some embodiments of the present application;

[0031] Figure 7 for Figure 6 Schematic diagram of the cross-sectional structure along the axial direction.

[0032] The reference numerals in the specific implementation manner are as follows:

[0033] 1000. Vehicles;

[0034] 100, battery; 200, controller; 300, motor;

[0035] 10. Shell; 11. Electrode assembly; 12. Top cover; 13. Recessed portion; 14. Boss structure; 15. Raised portion; 16. Folded portion; 17. First insulating sealing gasket; 18. Second insulating sealing gasket; 19. Folded edge. DETAILED DESCRIPTION

[0036] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0038] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0039] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0040] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0041] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0042] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0043] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like 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 a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0044] At present, from the perspective of market development, the application of batteries is becoming more and more extensive. Batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as military equipment and aerospace and other fields. With the continuous expansion of battery application areas, its market demand is also constantly expanding.

[0045] In order to meet different power requirements, the battery may include one or more battery cells. When it is a battery cell, this battery cell can also be called a battery, wherein multiple battery cells can be connected in series, in parallel, or in mixed connection, and mixed connection refers to a mixture of series and parallel connection. Optionally, multiple battery cells can be connected in series, in parallel, or in mixed connection to form a battery module, and multiple battery modules can be connected in series, in parallel, or in mixed connection to form a battery. In other words, multiple battery cells can directly form a battery, or they can first form a battery module, and the battery module can then form a battery. The battery is further arranged in an electrical device to provide electrical energy to the electrical device.

[0046] The battery may include a lithium-ion secondary battery, a lithium-ion primary battery, a lithium-sulfur battery, a sodium-lithium-ion battery, a sodium-ion battery or a magnesium-ion battery, etc., which is not limited in the embodiments of the present application. The battery may be cylindrical, flat, rectangular or other shapes, etc., which is not limited in the embodiments of the present application. Batteries are generally divided into three types according to the packaging method: cylindrical batteries, square batteries and soft-pack batteries.

[0047] The battery may also be a secondary battery or a primary battery, wherein a secondary battery refers to a battery cell that can be used continuously by activating the active material by charging after the battery cell is discharged, and a primary battery refers to a battery cell that cannot be used continuously by activating the active material by charging after the power of the battery cell is exhausted. The battery cell may also be a lithium-ion battery, a sodium-ion battery, a sodium-lithium-ion battery, a lithium metal battery, a sodium metal battery, a lithium-sulfur battery, a magnesium-ion battery, a nickel-hydrogen battery, a nickel-cadmium battery, a lead-acid battery, etc., but is not limited thereto. The battery may be a cylindrical battery, a prismatic battery, a soft-pack battery or a battery of other shapes, wherein the prismatic battery includes a square shell battery, a blade-shaped battery, a polygonal prismatic battery, and a polygonal prismatic battery is, for example, a hexagonal prismatic battery, etc., and the present application has no particular restrictions.

[0048] When there are multiple battery cells, the multiple battery cells in the battery are stacked together along a certain direction. The multiple battery cells can be arranged along a first direction and a second direction, and the first direction and the second direction are perpendicular to each other.

[0049] When the battery includes a battery cell, the battery cell itself forms a battery. At this time, the battery includes a shell, an electrode assembly and an electrolyte. The electrode assembly and the electrolyte are both arranged in the shell. The electrode assembly is composed of a positive electrode sheet, a negative electrode sheet and a separator. It mainly relies on the movement of metal ions between the positive electrode sheet and the negative electrode sheet to work. The positive electrode sheet includes a positive electrode collector and a positive electrode active material layer. The positive electrode active material layer is coated on the surface of the positive electrode collector. The positive electrode collector not coated with the positive electrode active material layer protrudes from the positive electrode collector coated with the positive electrode active material layer. The positive electrode collector not coated with the positive electrode active material layer serves as a positive electrode ear. Taking lithium-ion batteries as an example, the material of the positive electrode collector can be aluminum, and the positive electrode active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganese oxide, etc. The negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer. The negative electrode active material layer is coated on the surface of the negative electrode current collector. The negative electrode current collector not coated with the negative electrode active material layer protrudes from the negative electrode current collector coated with the negative electrode active material layer. The negative electrode current collector not coated with the negative electrode active material layer serves as a negative electrode ear. The material of the negative electrode current collector can be copper, and the negative electrode active material can be carbon or silicon, etc.

[0050] The shell is generally provided with a top cover, which covers the shell to form a closed space. In the related art, the residual space is located between the top cover and the top of the battery cell, which has a smaller space, and relatively larger gas pressure will be generated when gas is generated.

[0051] The shape of the top cover can be compatible with the shape of the shell. For example, when the shell is a rectangular parallelepiped structure, the top cover can be a rectangular plate structure that is compatible with the open position of the shell. For another example, when the shell is a cylindrical structure, the top cover can be a circular plate structure that is compatible with the open position of the shell. In addition, the material of the top cover can be a variety of materials, such as copper, iron, aluminum, steel, aluminum alloy, etc. The material of the top cover can be the same as or different from that of the shell. Therefore, the general shell can also be made of alloy material, generally aluminum alloy, etc.

[0052] However, during the use of the battery, as the internal electrolyte is consumed, a certain amount of gas will be generated, and the gas will flow into the shell, increasing the gas pressure inside the shell. Generally, the battery cell is assembled inside the shell, and the space occupied by the battery cell is large, so the residual space left in the shell is small. When gas is generated, the gas pressure in the residual space will increase, thereby squeezing the battery cell.

[0053] Based on the above considerations, an embodiment of the present application provides a battery 100, which aims to appropriately increase the residual space inside the shell 10 of the battery 100, and when gas is generated, it can reduce the gas pressure inside the shell 10 to a certain extent, thereby reducing the pressure on the electrode assembly 11.

[0054] The present application also provides an electric device having the battery 100 provided in the above embodiment, that is, an electric device using the battery 100 as a power source or various energy storage systems using the battery 100 as an energy storage element, which can increase the safety of the electric device.

[0055] Among them, the electrical equipment can be vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys and electric tools, etc. Vehicles can be fuel vehicles, gas vehicles or new energy vehicles, and new energy vehicles can be pure electric vehicles, hybrid vehicles or extended-range vehicles, etc.; spacecraft include airplanes, rockets, space shuttles and spacecrafts, etc.; electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys and electric airplane toys, etc.; electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools and railway electric tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators and electric planers, etc. The embodiments of the present application do not impose special restrictions on the above-mentioned electrical equipment.

[0056] The battery 100 disclosed in the embodiment of the present application can be used in, but not limited to, electrical equipment such as vehicles, ships or aircraft. Electrical equipment can use a power supply system having the battery disclosed in the present application, which is conducive to improving the reliability of the electrical equipment.

[0057] For the convenience of explanation, the following embodiments are described by taking the electrical equipment provided in the embodiments of the present application as a vehicle as an example.

[0058] Please refer to Figure 1 , Figure 1 A schematic diagram of the structure of a vehicle 1000 provided for some embodiments of the present application. The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 100 is provided inside the vehicle 1000, and the battery 100 may be provided at the bottom, head or tail of the vehicle 1000. The battery 100 may be used to power the vehicle 1000, for example, the battery 100 may be used as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300, and the controller 200 is used to control the battery 100 to power the motor 300, for example, for starting, navigating and driving the vehicle 1000.

[0059] In some embodiments of the present application, the battery 100 can not only serve as an operating power source for the vehicle 1000, but also serve as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0060] In some embodiments of this application, please refer to Figure 2 , Figure 3 , Figure 4 and Figure 5 The battery 100 includes a shell 10, an electrode assembly 11, and a top cover 12. The shell 10 has an inner cavity; the electrode assembly 11 is installed in the inner cavity; the top cover 12 is installed on the shell 10 to encapsulate the electrode assembly 11, and a recessed portion 13 is provided on the inner wall of the top cover 12 and / or the shell 10, and the recessed portion 13 is used to form or expand the residual space in the shell 10.

[0061] Specifically, the housing 10 accommodates the electrode assembly 11, which is the battery cell, assembled inside the housing 10. The top cover 12 is arranged on the housing 10, thereby closing the housing 10 and isolating the battery cell from the external space. The tabs of the battery cell are connected to the poles at the housing 10 or the top cover 12 through the adapter, so that charging and discharging are possible.

[0062] The top cover 12 is a cover body located on the upper part of the shell 10, which is sealed on the shell 10. The shell 10 has an inner cavity that can accommodate the battery cell, and the cross-section of the shell 10 can be rectangular or circular. When the battery cell is installed in the inner cavity, when the bottom of the battery cell contacts the bottom of the shell 10, the top of the battery cell can be a certain distance away from the top cover 12. The residual space is the space not occupied by the battery cell. The air pressure in this space can be negative pressure or normal pressure. When gas is generated, the gas will enter this space, thereby increasing the air pressure in this space, and the air pressure will cause a certain pressure on the battery cell. Therefore, in order to reduce the pressure on the battery cell, this space can be made larger, and the air pressure can be appropriately reduced when the same amount of gas is discharged.

[0063] The residual space may be formed between the battery cell and the top cover 12. In this embodiment, a recess 13 is provided on the inner wall of the top cover 12 facing the inner cavity, and the recess 13 is used to form or expand the residual space not occupied by the electrode assembly 11 in the housing 10.

[0064] In the related art, there may be a certain distance between the top cover 12 and the battery cell, in which case there is residual space, or there is no gap between the two when they are in contact, in which case there is no residual space. In this embodiment, a recessed portion 13 is provided on the inner wall of the top cover 12 facing the inner cavity. Since the recessed portion 13 is provided, when the top cover 12 is in contact with the battery cell, the recessed portion 13 provides and forms a residual space, and when there is a gap between the top cover 12 and the battery cell, the recessed portion 13 expands the residual space. The recessed portion 13 can be a groove body opened on the inner wall of the top cover 12, which can be a rectangular groove, a circular groove, a groove-shaped groove, or a strip groove. The specific form is not limited, as long as it forms a concave structure lower than the inner wall surface. In this way, the recessed portion 13 has a space that can accommodate gas, which increases the residual space.

[0065] Alternatively, in some cases, the recessed portion 13 can also be provided on the inner wall of the housing 10 facing the inner cavity. Similarly, there is no interval or a very small interval between the general battery cell and the inner wall of the housing 10. When the distance is very small, the residual space is small, and a blue glue is also provided between the housing 10 and the battery cell, which further reduces the residual space. Therefore, in this case, the recessed portion 13 can be provided on this inner wall, increasing the residual space, or in other words, when there is no interval, the recessed portion 13 forms a residual space. The recessed portion 13 can also be a groove structure, which can be a circular groove, a groove-shaped groove, or a strip groove. The specific form is not limited, as long as it forms a concave structure lower than the inner wall surface. In this way, the recessed portion 13 has a space that can accommodate gas, which increases the residual space.

[0066] Of course, a recessed portion 13 can be formed on both the inner wall of the top cover 12 and the inner wall of the shell 10 to further increase the size of the residual space. It should be noted that when a recessed portion 13 is provided on the inner wall of the shell 10, the entire inner wall of the shell 10 cannot be concave, because the side wall of the battery cell has nothing to attach to, which is not conducive to the stability of the battery cell.

[0067] Therefore, the effect of this embodiment is that by providing a recessed portion 13 on the top cover 12 and / or the inner wall of the shell 10, a residual space is formed or increased, so that after the gas is discharged, there is a larger space to accommodate the gas, thereby reducing the gas pressure inside the shell 10, reducing the gas pressure on the battery cell, reducing the risk of battery cell structure failure, and reducing the risk of safety accidents of the battery 100.

[0068] In some embodiments, see Figure 4 The recessed portion 13 forms a boss structure 14 correspondingly on the side of the top cover 12 facing away from the inner cavity.

[0069] Specifically, the recessed portion 13 is formed on the side of the top cover 12 facing the inner cavity, but since the top cover 12 has a certain thickness, the depth of the recessed portion 13 can only be limited within the thickness range, which cannot further expand the space of the recessed portion 13, nor can it further expand the volume of the residual space. Therefore, in order to solve this problem, the recessed portion 13 provided in this embodiment forms a boss structure 14 on the side of the top cover 12 facing away from the inner cavity. In this way, due to the boss structure 14, the depth of the recessed portion 13 can be greater than the thickness of the top cover 12 itself, thereby expanding the volume of the residual space as much as possible.

[0070] Since the boss structure 14 is formed corresponding to the recessed portion 13, the shape of the boss structure 14 can be matched with the shape of the recessed portion 13, that is, when the recessed portion 13 is cylindrical, the boss structure 14 is cylindrical, and when the recessed portion 13 is a strip groove, the boss structure 14 is also strip-shaped. When the recessed portion 13 includes multiple components, that is, multiple strip-shaped or other shaped structures, the boss structure 14 is also multiple with matching shapes.

[0071] The effect of this embodiment is that, due to the presence of the boss structure 14, the depth of the recess 13 does not need to be limited within the thickness range of the top cover 12, and the volume of the recess 13 can be further increased, that is, the volume of the residual space is increased, thereby further reducing the gas pressure caused by the gas and the impact on the battery cell.

[0072] In some embodiments, see Figure 4 and Figure 5 A folded portion 16 recessed into the inner cavity is formed on the side wall of the shell 10 near the top cover 12, and a folded edge 19 is provided at one end of the shell 10 where the top cover 12 is located. The top cover 12 is at least partially located between the folded portion 16 and the folded edge 19, and the outer surface of the boss structure 14 is flush with the outer surface of the folded edge 19 or protrudes from the outer surface of the folded edge 19.

[0073] Specifically, the folding portion 16 can be understood as follows: the shell wall of the housing 10 is recessed toward one side of the inner cavity and formed into a folded shape, so that a folding portion 16 protruding from the inner wall is formed in the inner cavity, and the folding portion 16 has a flat upper surface and a flat bottom surface in the inner cavity. It provides a mounting platform for the top cover 12, and the top cover 12 is at least partially overlapped on the folding portion 16.

[0074] At least part of the top cover 12 overlaps the folded portion 16, that is, overlaps the upper surface of the folded portion 16. It can be understood that the remaining part of the top cover 12 excluding the boss structure 14 overlaps the upper surface of the folded portion 16, because the boss structure 14 is arranged at the center of the top cover 12, and the part excluding the boss structure 14 is an annular area surrounding the boss structure 14. This annular area can achieve good positioning of the top cover 12 by overlapping the folded portion 16.

[0075] When the top cover 12 is overlapped on the folding portion 16, a limiting structure is also required on the upper side of the top cover 12, so the housing 10 is provided with a folding edge 19 at one end where the top cover 12 is located. The folding edge 19 can be provided around the upper end of the housing 10, and at least part of the top cover 12 is provided between the folding edge 19 and the folding portion 16, so as to ensure the stability of the installation of the top cover 12. The folding edge 19 is an edge that maintains an angle with the main structure of the housing 10, and specifically can be an angle of 90 degrees, that is, when the housing 10 is provided vertically, the folding edge 19 is provided horizontally, and the bottom surface of the folding edge 19 is used to limit the top cover 12.

[0076] Therefore, when the boss structure 14 is provided, the outer surface of the boss structure 14 can be flush with the outer surface of the folded edge 19, or it can protrude from the outer surface. When it protrudes from the outer surface of the folded edge 19, the residual space can be increased well. When it is flush with the outer surface of the folded edge 19, the flatness of the overall appearance of the housing 10 can be maintained, and the placement of the battery 100 can be facilitated. Therefore, when the residual space is sufficient or reaches a reasonable volume, it can be preferred to be flush with the surface of the housing 10.

[0077] The effect of this embodiment is that the setting of the folding portion 16 provides a good installation platform for the top cover 12, so that the top cover 12 can be installed on the end of the shell 10 without dead angles, and the folding edge 19 is provided to further ensure the stability and firmness of the installation of the top cover 12.

[0078] For further information, please refer to Figure 4 and Figure 5 The top end of the electrode assembly 11 abuts against the folded portion 16 , and the folded portion 16 extends along the circumference of the shell 10 . The folded portion 16 limits the electrode assembly 11 in the inner cavity from the top.

[0079] Specifically, the electrode assembly 11 is arranged in the inner cavity of the shell 10, and its bottom contacts the bottom of the shell 10, and its top also needs to be limited, so as to ensure the overall stability of the electrode assembly 11, so the top of the electrode assembly 11 is abutted by the folding portion 16. The bottom surface of the folding portion 16 is used to contact the top surface of the electrode assembly 11, so as to limit the electrode assembly 11, so that the electrode assembly 11 is stably maintained in the inner cavity. And in order to increase the limiting effect, the folding portion 16 can be formed on the entire circumference of the shell 10, that is, it extends one circle on the entire circumference, so as to form an annular upper surface and bottom surface, so that the electrode assembly 11 can be limited on the entire circumference.

[0080] In this embodiment, the electrode assembly 11 is limited by the folding portion 16 , thereby effectively ensuring the overall stability of the electrode assembly 11 .

[0081] In some embodiments, please refer to Figure 4 and Figure 5 A first insulating sealing gasket 17 is provided between the top cover 12 and the folded portion 16 , and a second insulating sealing gasket 18 is provided between the top cover 12 and the folded edge 19 .

[0082] Since the folding portion 16 is provided, it is also beneficial to the sealing setting between the top cover 12 and the shell 10. Specifically, a first insulating sealing gasket 17 is provided between the folding portion 16 and the top cover 12, thereby achieving the sealing of the inner cavity of the shell 10 and the insulation between the top cover 12 and the folding portion 16.

[0083] And the top cover 12 also needs to be insulated from the folded edge 19. A second insulating seal 18 is also provided between the top cover 12 and the folded edge 19 to further ensure sealing and insulation. A second insulating seal 18 is provided between the bottom surface of the folded edge 19 and the top cover 12 to achieve extrusion, sealing and insulation.

[0084] This embodiment achieves sealing and insulation of the inner cavity of the housing 10 by means of the first insulating seal 17, and the structure assembly is reasonable and has good stability. A second insulating seal 18 is also arranged between the top cover 12 and the folded edge 19 to further ensure sealing and insulation.

[0085] For further information, please refer to Figure 4 and Figure 5 The first insulating seal gasket 17 and the second insulating seal gasket 18 are connected to insulate and isolate the top cover 12 from the inner wall of the shell 10.

[0086] Specifically, in addition to being squeezed between the top cover 12 and the folding portion 16, the first insulating sealing gasket 17 also contacts the inner wall of the shell 10, and in addition to being squeezed between the folding portion 16 and the folded edge 19, the second insulating sealing gasket 18 also contacts the inner wall of the shell 10. A gap may be left between the top cover 12 and the inner wall of the shell 10, and the first insulating sealing gasket 17 and the second insulating sealing gasket 18 both extend into the gap and are in contact with each other, so that the top cover 12 and the inner wall of the shell 10 are isolated by the two, and are insulated.

[0087] The effect of this embodiment is that the top cover 12 is insulated and isolated from the inner wall of the shell 10 by two sealing gaskets, thereby further ensuring the use safety and sealing effect of the battery 100.

[0088] In some embodiments, see Figure 4 , the diameter of the boss structure 14 is φ1, the diameter of the shell 10 is φ2, φ1 / φ2∈[0.5,1).

[0089] Specifically, when the battery shell 10 adopts a cylindrical structure, the boss structure 14 can be a boss with a circular cross-section. When it is circular, the boss has a diameter of φ1. At the same time, the shell 10 itself also has a diameter of φ2. The diameter of the boss structure 14 and the diameter of the shell 10 need to satisfy a certain relationship. The diameter of the boss structure 14 cannot be too large or too small. Specifically, the diameter of the shell 10 is used as a reference, specifically φ1 / φ2∈[0.5,1), that is, the diameter of the protruding structure must be greater than or equal to one-half of the diameter of the shell 10, but must be smaller than the diameter of the shell 10. In the long-term use practice, it is found that the boss structure 14 needs to be greater than or equal to one-half of the diameter of the shell 10, so that a sufficiently large residual space can be generated, and it must be smaller than the diameter of the shell 10. When it is equal to the diameter of the shell 10, it will make it difficult to assemble between the top cover 12 and the shell 10, and even when it is greater than the diameter of the shell 10, it is even more difficult to assemble.

[0090] The effect of this embodiment is that the diameter of the boss structure 14 , that is, the relationship between the boss structure 14 and the diameter of the shell 10 , can ensure that the residual space is increased while not affecting the structural assembly of the top cover 12 on the shell 10 .

[0091] In some embodiments, see Figure 4 , the thickness T1 of the top cover 12 is greater than or equal to 0.1 mm and less than or equal to 5 mm.

[0092] Specifically, the top cover 12 is a plate-like structure, which can have the above-mentioned boss structure 14. It can be specifically configured as follows: the top cover 12 can be selected to be circular, and the corresponding shell 10 is cylindrical. When the top cover 12 is circular, the boss structure 14 is also circular. The boss structure 14 is located in the middle area of ​​the top cover 12, and the part of the top cover 12 outside the boss structure 14 is assembled with the shell 10 for sealing. The thickness of the top cover 12 is greater than or equal to 0.1 mm and less than or equal to 5 mm, and the thickness of the boss structure 14 is also within this thickness range.

[0093] The effect of this embodiment is that the thickness of the top cover 12 is provided. When the boss structure 14 is not provided, it can ensure that the recessed portion 13 can be opened to a suitable depth and can facilitate the assembly of the top cover 12 so that it can be well installed on the shell 10.

[0094] In some embodiments, see Figure 2 and Figure 3 ,or Figure 6 and Figure 7 The recessed portion 13 on the inner wall of the housing 10 is a groove opened on the inner wall, and the groove forms a convex portion 15 on the outer wall of the housing 10 accordingly.

[0095] Specifically, the recessed portion 13 on the inner wall of the housing 10 is a groove, that is, a concave groove structure opened on the inner wall. The groove structure itself has a cavity, and this cavity is connected to the inner cavity of the housing 10, and this cavity forms or expands the residual space inside the housing 10.

[0096] Specifically, the electrode assembly 11 is arranged inside the shell 10, and there may be a gap or no gap between the electrode assembly 11 and the inner wall of the shell 10. When there is no gap, the opening of the groove forms a residual space that can accommodate gas. When there is a gap, the opening of the groove expands the residual space. Generally speaking, there is a gap between the electrode assembly 11 and the inner wall of the shell 10, but the gap is very small. And blue glue is also arranged between the electrode assembly 11 and the inner wall of the shell 10 to further reduce the gap. Therefore, opening a groove on the inner wall of the shell 10 can increase the residual space.

[0097] The groove may be a strip groove, a rectangular groove or a circular groove, and the specific form is not limited as long as it has a certain groove body space.

[0098] See also Figure 2 and Figure 3 ,or Figure 6 and Figure 7 When the protrusion 15 is not provided, the depth of the groove is limited to the thickness of the shell 10. Therefore, in order to increase the depth of the groove as much as possible, the present embodiment provides a protrusion 15 at a position corresponding to the groove, which is equivalent to the above-mentioned boss structure 14. The protrusion 15 is correspondingly provided on the outer wall of the shell 10. The shape of the protrusion 15 can be the same as the shape of the groove, which is equivalent to forming the groove wall of the groove.

[0099] The effect of this embodiment is that the recessed portion 13 provided on the inner wall of the housing 10 is a groove, which can increase the residual space inside the housing 10. The different shapes of the grooves diversify the implementation methods of increasing the residual space, and can be selectively provided according to the use requirements and the specific structure of the housing 10. Since the groove can form a convex portion 15 on the outer wall of the housing 10, the residual space is further increased, the internal air pressure of the housing 10 is reduced, and the pressure on the electrode assembly 11 is reduced.

[0100] In some embodiments, see Figure 2 and Figure 3 ,or Figure 6 and Figure 7 The width of the groove in the axial direction of the shell 10 is H1, the length of the shell 10 in the axial direction is H, and H1 / H∈(0.01, 1), the depth of the groove in the radial direction of the shell 10 is W1, the diameter of the shell 10 is φ2, and W1 / φ2∈(0, 0.5), generally W1 / φ2∈(0, 0.2) can be selected.

[0101] Specifically, the shell 10 can be selected as a cylindrical shell 10, so the shell 10 has an axial direction and a radial direction. The axial direction is the direction of the line between the centers of the two end faces of the shell 10, or the direction of the line between the bottom surface and the top cover 12, and the radial direction is the direction perpendicular to the axial direction. Therefore, the shell 10 has a length, that is, a height, in the axial direction, and a diameter in the radial direction. The groove is opened on the inner wall of the shell 10, and the groove itself has a certain space. This space has a certain width in the axial direction of the shell 10. This width is defined as H1. The shell 10 has a length H in the axial direction. The width H1 has certain requirements and cannot be too large or too small. Its width range is H1 / H∈(0.01, 1), that is, H1 should be smaller than H and larger than 0.01H, so that it will not be too small to make the residual space too small, and it will not be too large, and it should be smaller than H, because if it is equal to H, it will be unfavorable for the stability of the electrode assembly 11, and the electrode assembly 11 will shake in the radial direction. On the other hand, the groove has a certain depth, that is, the depth in the radial direction of the shell 10, which is positioned as W1. This depth also has certain requirements, namely W1 / φ2∈(0, 0.5). First, it must have a certain depth, so it cannot be 0. Secondly, it must be smaller than half of the diameter of the shell 10, preferably one-fifth. If it is too large, it will be detrimental to the structural stability of the battery 100 itself, making the appearance of the battery 100 shell 10 unreasonable and also affecting the energy density of the battery 100.

[0102] Therefore, the effect of this embodiment is that a reasonable size of the groove is set, so that the groove will not be too long in the axial direction of the shell 10 to affect the stability of the electrode assembly 11, and will not be too deep in the radial direction of the shell 10 to affect the energy density of the battery 100, while being able to generate a larger residual space to meet the use requirements.

[0103] In some embodiments, see Figure 6 and Figure 7 , the recessed portion 13 on the inner wall of the housing 10 is a groove, the number of the grooves is multiple, the multiple grooves extend along the axial direction of the housing 10 and are evenly spaced in the circumferential direction of the housing 10; or, refer to Figure 2 , Figure 3 , the plurality of grooves extend along the circumference of the housing 10 and are evenly spaced apart in the axial direction of the housing 10; or, the plurality of grooves are arranged in a scattered point shape.

[0104] Specifically, the groove has an extension direction, which can extend along the axial direction of the housing 10 to form a straight long strip, and the corresponding protrusion 15 also forms a straight long strip, or it can extend along the circumferential direction of the housing 10 to form an arc strip, and the corresponding protrusion 15 also forms an arc strip. In both cases, multiple grooves can be provided, and multiple protrusions 15 are formed accordingly. The multiple grooves extending along the axial direction are evenly arranged in the circumferential direction, and the multiple grooves extending along the circumferential direction are evenly arranged in the axial direction.

[0105] Alternatively, in some embodiments, the grooves may also be distributed in a scattered manner, that is, block-shaped grooves are distributed at intervals on the housing 10, and the distribution of these grooves may be regular or irregular.

[0106] This embodiment provides a specific arrangement of the grooves so that the grooves are reasonably arranged and can be evenly arranged, so that the overall appearance layout of the shell 10 is reasonable and neat, and setting a plurality of grooves can effectively increase the residual space.

[0107] In some embodiments, the recessed portion 13 on the inner wall of the housing 10 is a groove, and the groove is arranged in a spiral form on the housing 10. The spiral form can be understood as extending around the circumference of the housing 10 and extending along the axial direction of the housing 10, finally forming a spiral shape.

[0108] This embodiment provides a groove arranged in a spiral form, which can also form a spiral protrusion 15 on the outer wall of the shell 10. The spiral groove forms a connected groove body along the entire length direction of the shell 10, which can accommodate gas at various locations inside the shell 10 and effectively relieve the gas pressure inside the shell 10.

[0109] In some embodiments, an insulating pad is provided on the surface of the housing 10 ; the insulating pad covers the protrusion 15 .

[0110] Specifically, the insulating pad is an insulating protective pad, which is arranged on the surface of the shell 10 and surrounds the shell 10, forming a protective and insulating effect on the shell 10 to prevent interference with other batteries 100 or battery cells. The battery 100 has an energy density, that is, the amount of electricity that can be generated when the total volume of the battery 100 is certain. The total volume of the battery 100 generally includes the volume occupied by the shell 10 itself and the volume of the outer wall insulating pad. The raised portion 15 set in this embodiment is flush with the insulating pad, that is, the raised portion 15 is compatible with the thickness range of the insulating pad. Therefore, although the raised portion 15 is set, the radial size of the battery 100 is not increased, and the total volume of the battery 100 is not increased. Therefore, the setting of the raised portion 15 does not reduce the energy density of the battery 100.

[0111] Alternatively, in another case, the protrusion 15 is flush with the surface of the insulating pad, and the energy density of the battery is not reduced.

[0112] The effect of this embodiment is that the provision of the protrusion 15 does not reduce the energy density of the battery 100 and achieves the effect of increasing the residual space.

[0113] In some embodiments, the recessed portion 13 is integrally formed with the top cover 12 and / or the housing 10. The integrally formed structure can be uniformly cast by injection molding or other processes, avoiding the need to open the recessed portion on the top cover 12 or the housing 10 after the top cover 12 or the housing 10 is formed, thus simplifying the processing technology. In addition, the integrally formed structure can also make the design of the recessed portion easier to control, so that it can be formed into the required size and shape.

[0114] The present application also provides an electrical device, which is equipped with the battery 100 provided by any of the above embodiments. Since the residual space of the battery 100 is increased, it can accommodate more gas. When there is a certain amount of gas, it is equivalent to appropriately reducing the gas pressure of the residual space, which can maintain the stability of the battery 100, thereby ensuring the stability of the electrical device.

[0115] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; 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 included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery, characterized in that: include a housing having an inner cavity; an electrode assembly, the electrode assembly being installed in the inner cavity; as well as A top cover is mounted on the shell to encapsulate the electrode assembly. A recessed portion is provided on the top cover and / or the inner wall of the shell, and the recessed portion is used to form or expand the residual space in the shell.

2. The battery according to claim 1, characterized in that The recessed portion forms a boss structure corresponding to a side of the top cover facing away from the inner cavity.

3. The battery according to claim 2, characterized in that A folded portion recessed into the inner cavity is formed on the side wall of the shell near the top cover, and a folded edge is provided at the end of the shell where the top cover is located. The top cover is at least partially located between the folded portion and the folded edge, and the outer surface of the boss structure is flush with the outer surface of the folded edge or protrudes from the outer surface of the folded edge.

4. The battery according to claim 3, characterized in that The top end of the electrode assembly abuts against the folded portion, the folded portion extends along the circumference of the shell, and the folded portion limits the electrode assembly in the inner cavity from the top.

5. The battery according to claim 3 or 4, characterized in that A first insulating sealing pad is provided between the top cover and the folded portion, and a second insulating sealing pad is provided between the top cover and the folded edge.

6. The battery according to claim 5, characterized in that The first insulating seal pad and the second insulating seal pad are connected to insulate and isolate the top cover from the inner wall of the shell.

7. The battery according to any one of claims 1 to 6, characterized in that: The recessed portion on the inner wall of the shell is a groove, and the groove forms a corresponding raised portion on the outer wall of the shell.

8. The battery according to any one of claims 1 to 6, characterized in that: The recessed portion on the inner wall of the shell is a groove, the number of the grooves is multiple, the multiple grooves extend along the axial direction of the shell and are evenly spaced in the circumferential direction of the shell; or The plurality of grooves extend along the circumference of the housing and are evenly spaced in the axial direction of the housing; or The plurality of grooves are arranged in a scattered pattern.

9. The battery according to any one of claims 1 to 6, characterized in that: The recessed portion on the inner wall of the shell is a groove, and the groove is arranged in a spiral form on the shell.

10. The battery according to claim 7, characterized in that An insulating pad is provided on the surface of the shell; The insulating pad covers the raised portion; Alternatively, the protrusion is flush with the surface of the insulating pad.

11. The battery according to any one of claims 1 to 10, characterized in that: The recessed portion is integrally formed with the top cover and / or the shell.

12. An electrical equipment, characterized in that: The battery according to any one of claims 1 to 11 is installed.

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