Battery and electric device

Abstract

The utility model discloses a battery and a power utilization device, the battery comprises a box body, a battery monomer and a bottom protection plate, the box body comprises a bottom plate and a side plate, the side plate is arranged on the peripheral side edge of the bottom plate in a surrounding mode, the side plate and the bottom plate define a containing space used for containing the battery monomer, the battery monomer is arranged in the containing space, and the bottom protection plate is arranged in the containing space. The battery monomer comprises a first surface with the largest surface area, the first surface is perpendicular to the first direction and faces the bottom plate, and the bottom protection plate and the bottom plate are opposite in the first direction and are arranged at an interval to form a buffer space. Therefore, a buffer gap can be formed between the bottom protection plate and the bottom plate, so that when the battery monomers are expanded, the bottom plate can be extruded by the battery monomers to deform, and a part of space occupied by the buffer gap is released to accommodate the expansion amount of the battery monomers; the space originally reserved in the battery for accommodating the swelling capacity of the battery monomer can be reduced, so that the overall structure of the battery is more compact, and the space utilization rate is higher.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery and an electrical device. Background Art

[0002] In the related art, a bottom plate and a side plate define a accommodating space, a battery cell is arranged in the accommodating space, and a bottom guard plate is arranged under the bottom plate to improve the safety and reliability of the battery. However, during the charging and discharging process, the battery will expand and deform, squeezing the bottom plate and the bottom guard plate, and even causing the shell of the battery cell to rupture, thereby causing leakage, short circuit, thermal runaway, etc., resulting in low safety and reliability of the battery cell. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, one purpose of the utility model is to provide a battery that can meet the expansion buffering requirements and also has reliable protection performance, thereby improving the reliability and safety of the battery.

[0004] The present application further proposes an electrical device using the above battery.

[0005] In the first aspect, the present application proposes a battery, comprising: a box body, a battery cell and a bottom guard plate, the box body comprises a bottom plate and side plates, the side plates are arranged around the peripheral edges of the bottom plate, and the side plates and the bottom plate define a accommodating space for accommodating the battery cell, the battery cell is arranged in the accommodating space, and the battery cell comprises a first surface with the largest surface area among multiple surfaces, the first surface is perpendicular to a first direction and faces the bottom plate, and the bottom guard plate and the bottom plate are opposite to each other and spaced apart along the first direction to form a buffer space.

[0006] According to the battery of the embodiment of the present application, a buffer gap can be formed between the bottom guard plate and the bottom plate, so that when the battery cell expands, the bottom plate can be squeezed by the battery cell to deform it, and then part of the space occupied by the buffer gap is released to accommodate the expansion of the battery cell. On the basis of the battery having the ability to resist bottom ball impact, the space originally reserved in the battery to accommodate the expansion of the battery cell can be reduced, so that the overall structure of the battery is more compact and the space utilization rate is higher.

[0007] According to some embodiments of the present application, the battery includes a plurality of battery cells that are opposite to each other and arranged in sequence along a first direction, and first surfaces of the plurality of battery cells are perpendicular to the first direction.

[0008] In the above technical solution, multiple battery cells can be arranged in a first direction, and the expansion generated by each battery cell is accumulated in the first direction. They can be squeezed against each other and act together on the bottom plate to deform it, thereby releasing part of the space occupied by the buffer gap to accommodate the expansion of the battery cell, thereby improving the utilization of the space between the bottom plate and the bottom guard plate, and allowing more battery cells to be arranged in the battery and higher energy density.

[0009] According to some embodiments of the present application, the battery includes a plurality of battery cells arranged along a second direction, the second direction is perpendicular to the first direction, and the first surfaces of the plurality of battery cells all face the bottom plate.

[0010] In the above technical solution, if any one of the multiple battery cells arranged along the second direction expands along the first direction, the bottom plate can be squeezed to release part of the space occupied by the buffer gap to accommodate the expansion of the battery cell, thereby improving the utilization of the space between the bottom plate and the bottom guard plate, and allowing more battery cells to be arranged in the battery and higher energy density.

[0011] According to some embodiments of the present application, when projected along the first direction, the first surfaces of the plurality of battery cells coincide with the projection of the buffer space.

[0012] In the above technical solution, under the projection in the first direction, the entire first surface is located in the buffer space, so that the expansion deformation generated in the middle area and the edge area of ​​the first surface can be buffered and absorbed by the buffer space located at one end of the first direction, thereby improving the buffering effect and buffering stability of the buffer space, thereby effectively improving the reliability and safety of the battery.

[0013] According to some embodiments of the present application, the box body also includes a reinforcing structure, which is connected to the bottom guard plate along the first direction; or the bottom guard plate is formed with a reinforcing structure, which is protruding from a side surface of the bottom guard plate along the first direction.

[0014] In the above technical solution, a reinforcing structure is provided on the bottom guard plate, and the reinforcing structure is integrally formed with the bottom guard plate (that is, the bottom guard plate protrudes toward the surface of the bottom plate to form a reinforcing structure), or is a split structure and is provided on the bottom guard plate (that is, the reinforcing structure is connected to the bottom guard plate). The bottom guard plate is a thin plate structure with low structural strength. The reinforcement structure is provided in cooperation with the bottom guard plate to increase the overall structural strength.

[0015] According to some embodiments of the present application, the reinforcement structure is connected to the bottom guard plate, and the reinforcement structure is located between the bottom guard plate and the bottom plate.

[0016] According to some embodiments of the present application, the bottom guard plate is convex toward the surface of the bottom plate, and the surface of the bottom guard plate is concave away from the bottom plate to form a reinforcement structure.

[0017] According to some embodiments of the present application, a maximum dimension of the reinforcement structure along the first direction is 1 mm to 4 mm.

[0018] In the above technical scheme, the raised height of the reinforced structure can be made more reasonable. On the one hand, sufficient buffer space can be reserved for the edge area of ​​the battery cell to effectively absorb the expansion force of the battery cell; on the other hand, the raised height of the raised structure can meet the structural strength requirements and avoid the raised height being too low, so as to improve the protective performance of the bottom guard plate.

[0019] According to some embodiments of the present application, the reinforcing structure is spaced apart from the base plate.

[0020] In the above technical solution, a certain gap is provided between the reinforcing structure and the bottom plate, and the gap can absorb the expansion of the edge area of ​​the battery cell defining the fitting surface, so as to further improve the buffering stability and reliability, thereby improving the stability and safety of the battery.

[0021] According to some embodiments of the present application, the first surface includes an edge along a second direction, the second direction is perpendicular to the first direction, and the battery also includes a reinforcement structure, the projection of the reinforcement structure along the first direction covers the projection of the edge along the first direction.

[0022] In the above technical scheme, on the one hand, the bottom guard plate structure can be effectively strengthened, and the buffer space can also meet the expansion requirements of the battery cells, so as to take into account the absorption of the expansion force of the battery cells and the protective performance of the bottom guard plate, and overcome the technical constraints of the existing technology that a reinforcing structure cannot be set on the bottom guard plate due to the expansion demand. On the other hand, the targeted setting of the reinforcing structure can further improve the ball impact protection performance of the bottom guard plate.

[0023] According to some embodiments of the present application, the first surface includes a first edge and a second edge arranged opposite to each other along a second direction, the reinforcement structure includes a first reinforcement portion and a second reinforcement portion, the projection of the first reinforcement portion along the first direction covers the projection of the first edge along the first direction, the projection of the second reinforcement portion along the first direction covers the projection of the second edge along the first direction, and the first reinforcement portion and the second reinforcement portion are arranged at intervals.

[0024] In the above technical solution, not only can the structural strength of the bottom guard plate be improved by the first reinforcement portion, but the first reinforcement portion is also arranged corresponding to the first edge, and the expansion deformation of the first edge area is small, so that the first reinforcement portion has less impact on the expansion space occupancy, while taking into account the expansion absorption of the battery cell.

[0025] Therefore, on the one hand, by setting a second reinforcement portion corresponding to the second edge and connecting the second reinforcement portion with the first reinforcement portion, the structure of the bottom guard plate in the direction of the second edge can be enhanced to further improve the structural strength of the bottom guard plate. On the other hand, the second reinforcement portion can also take into account the absorption of the expansion force of the battery cell.

[0026] In addition, it can be understood that the first reinforcement part and the second reinforcement part are arranged at intervals, so that the spacing space between the first reinforcement part and the second reinforcement part can at least partially overlap with the first surface, so that the expansion force and expansion deformation of the angular area where the first edge and the second edge intersect can be released into the spacing space, thereby improving the buffering effect and further improving the protection effect on the battery cell.

[0027] According to some embodiments of the present application, the battery cell includes a first battery cell and a second battery cell adjacent to each other along a second direction, the first battery cell includes a first edge, the second battery cell includes a second edge, the first edge and the second edge are adjacent to each other along the second direction, the reinforcement structure includes a first reinforcement portion, projected along the first direction, the projection of the same first reinforcement portion covers at least a portion of the first edge and at least a portion of the second edge, the first edge and the second edge are both perpendicular to the second direction, or the first edge and the second edge are parallel to the second direction.

[0028] In the above technical scheme, the first edge of the first battery cell and the second edge of the second battery cell may be adjacent, that is, the end of the first edge is adjacent to the end of the second edge, or the side of the first edge is adjacent to the side of the second edge. For example, the side surfaces of the battery cells are arranged in sequence in the second direction relative to each other, and the first edge and the second edge may both be width edges or both be length edges, and the first edge and the second edge may correspond to the same first reinforcement portion, which can increase the size of the reinforcement structure, improve the structural strength of the bottom guard plate, and the number of first reinforcement portions provided can be smaller, and the design difficulty and processing difficulty can also be lower, which can further reduce the cost of the bottom guard plate.

[0029] According to some embodiments of the present application, the battery cell includes a shell and an end cover, the end cover is connected to the shell to form a connecting portion, and a projection of the reinforcing structure along the first direction is completely misaligned with a projection of the connecting portion along the first direction.

[0030] According to some embodiments of the present application, the box body further includes an elastic member, which is disposed between the bottom plate and the bottom guard plate, and a projection of the elastic member along the first direction covers a projection of the connecting portion along the first direction.

[0031] In the above technical solution, by arranging an elastic part, the protective effect of the area where the second sub-edge is located can be improved, the probability of rupture failure in the heat-affected part and the area where the weld is located (i.e., the connecting part) can be reduced, and the stability and reliability of the battery cell can be improved. At the same time, according to the expansion and deformation distribution of the battery cell, the expansion of the connecting part and the heat-affected part is relatively small, and the elastic part can also avoid excessive local stress in the area where the connecting part and the heat-affected part are located, so as to extend the life of the battery cell.

[0032] According to some embodiments of the present application, the end cover and the shell are welded together, the battery cell includes a heat-affected portion, the heat-affected portion includes a shell portion on the shell with a spacing less than or equal to 5 mm from the connecting portion, and the projection of the reinforcement structure along the first direction is completely misaligned with the projection of the heat-affected portion along the first direction.

[0033] In the above technical scheme, the present application makes the projection of the reinforcement structure and the connecting part in the first direction completely misaligned, that is, no reinforcement structure is provided in the area where the connecting part is located, so that the distance between the structural weak area of ​​the battery cell and the bottom guard plate can be larger, the protection effect of the structural weak area (that is, the connecting part) is better, and the stability and safety of the battery are higher.

[0034] According to some embodiments of the present application, the battery includes n layers of battery cells stacked along a first direction, the thickness dimension of the battery cells along the first direction is D, the maximum distance between the bottom plate and the bottom guard plate along the first direction is H, and the battery satisfies: H≥n*D, 1≤n≤4, 25mm≤D≤80mm, H≥5mm.

[0035] In the above technical solution, the number of battery cells in each battery stack is not less than 1 and not more than 3, which can take into account both buffering effect and space utilization. If the battery height exceeds the battery stack height by 5 mm, the buffer space arrangement is less difficult and the buffering effect of the buffer space is better.

[0036] According to some embodiments of the present application, the battery satisfies: H≥n*D, n=2, 45mm≤D≤55mm, H≥9mm.

[0037] In a second aspect, the present application provides an electrical device, including: the battery described in the above embodiment.

[0038] According to some embodiments of the present application, the battery includes an upper cover, which is arranged opposite to the bottom plate along a first direction, and the electrical device includes a first component facing the upper cover, and the first component and the upper cover are spaced apart.

[0039] In the above technical solution, the deformation of the upper cover can be absorbed by the gap between the first component and the upper cover, that is, deformation space is reserved for the upper cover to avoid the expansion deformation of the first surface from being transmitted to the upper cover. The upper cover and the first component are rigidly connected without deformation space, which may cause damage to the battery cell, and the protection effect can be further improved.

[0040] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0042] Figure 1 is a schematic diagram of an electrical device according to an embodiment of the present application;

[0043] Figure 2 is a schematic diagram of a battery according to an embodiment of the present application;

[0044] Figure 3 is a schematic diagram of the cooperation between the box and the battery cell according to an embodiment of the present application;

[0045] Figure 4 is a partial enlarged schematic diagram of the cooperation between the box and the battery cell according to an embodiment of the present application;

[0046] Figure 5 is a schematic diagram of the coordination of a box body, a battery cell and a first buffer structure according to an embodiment of the present application;

[0047] Figure 6 is a bottom view of a battery according to an embodiment of the present application;

[0048] Figure 7 is a partially enlarged schematic diagram of a bottom guard plate according to an embodiment of the present application;

[0049] Figure 8 is a schematic diagram of a battery cell, a bottom guard plate, a bottom plate, and a first buffer structure according to an embodiment of the present application;

[0050] Fig. 9 is a schematic diagram of the coordination of a battery cell, a bottom guard plate, and a bottom plate according to an embodiment of the present application;

[0051] Fig.10 is a schematic diagram of a battery cell according to an embodiment of the present application.

[0052] Reference numerals:

[0053] Battery 100,

[0054] Box body 10, bottom plate 11, side plate 12,

[0055] Battery cell 20, first surface 20a, housing 21, end cover 22,

[0056] Bottom guard plate 30,

[0057] Reinforcement structure 40, elastic member 50,

[0058] Electric device 200, controller 300, motor 400,

[0059] The first direction is X, and the second direction is Y. DETAILED DESCRIPTION

[0060] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0061] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application 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 drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0062] Reference to "embodiment" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various places 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.

[0063] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" 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 direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0064] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can 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 application generally indicates that the associated objects before and after are in an "or" relationship.

[0065] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary descriptions and should not constitute any limitation to the present application.

[0066] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention 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 present invention.

[0067] In the description of the present invention, a first feature being “above” or “below” a second feature may include that the first and second features are directly in contact with each other, or may include that the first and second features are not in direct contact but are in contact with each other via another feature therebetween.

[0068] In the description of the present invention, a first feature “above”, “over” and “above” a second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature.

[0069] The term "plurality" used in the present application refers to two or more (including two).

[0070] At present, the application of batteries is becoming more and more extensive. Batteries are not only used in energy storage systems such as hydropower, thermal power, wind power and hybrid solar power stations, but are also widely used in electric bicycles, electric motorcycles, electric car lights and electric transportation vehicles, as well as military equipment and aerospace and other fields. With the continuous expansion of battery application fields, its market demand is also constantly expanding.

[0071] The battery cell may be a secondary battery, which refers to a battery cell that can be continuously used by activating the active material by charging after the battery cell is discharged.

[0072] The battery cell can 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 storage battery, etc., which is not limited in the embodiments of the present application.

[0073] The battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity. When there are multiple battery cells, the multiple battery cells are connected in series, in parallel or in hybrid connection through a busbar.

[0074] In some embodiments, a plurality of battery cells may be combined into a battery unit, that is, when there are a plurality of battery cells, the plurality of battery cells are arranged and fixed to form a battery unit.

[0075] In some embodiments, the battery includes a case and a battery cell, at least one battery cell or at least one battery unit is accommodated in the case, and the case has an accommodating space, and at least one battery cell or at least one battery unit is accommodated in the accommodating space.

[0076] In some embodiments, the box body can be used as a part of the chassis structure of the vehicle. For example, part of the box body can become at least a part of the floor of the vehicle, or part of the box body can become at least a part of the cross beam and longitudinal beam of the vehicle.

[0077] In some embodiments, a bottom guard plate is further provided under the bottom plate of the box body, and the bottom guard plate is spaced apart from the bottom plate to form a buffer space, which is used to absorb the expansion and deformation of the battery cells and can improve the impact protection under the box body.

[0078] In some embodiments, the battery or battery unit may be part of an energy storage system. The energy storage system may be an energy storage container, an energy storage cabinet, etc., in which the battery and the energy shutdown module are integrated.

[0079] The development of battery technology must take into account many design factors at the same time, such as energy density, cycle life, discharge capacity, charge and discharge rate and other performance parameters. In addition, the safety performance of the battery must also be considered.

[0080] The technical solutions described in the embodiments of the present application are applicable to batteries and electrical devices using batteries.

[0081] The electrical device may be a vehicle, a mobile phone, a portable device, a laptop computer, a ship, a spacecraft, an electric toy, an electric tool, and the like. The vehicle 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, and the like; the spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, and the like; the electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, and the like; the electric tool may include a metal cutting electric tool, a grinding electric tool, an assembly electric tool, and an electric tool for railways, such as an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact drill, a concrete vibrator, and an electric planer, and the like. The embodiments of the present application do not impose any special restrictions on the above-mentioned electrical devices.

[0082] For the convenience of description, the following embodiments are described by taking the electric device as a vehicle as an example.

[0083] Please refer to Figure 1 , Figure 1 A schematic diagram of the structure of a vehicle provided in some embodiments of the present application. A battery 100 is provided inside the vehicle, and the battery 100 can be provided at the bottom, head, or tail of the vehicle. The battery 100 can be used to power the vehicle, for example, the battery 100 can be used as an operating power source for the vehicle.

[0084] The vehicle may further include a controller 300 and a motor 400 . The controller 300 is used to control the battery 100 to supply power to the motor 400 . The motor 400 serves as a load, for example, to meet the power requirements for starting, navigating and driving the vehicle.

[0085] In some embodiments of the present application, the battery 100 can not only be used as an operating power source for the vehicle, but also as a driving power source for the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0086] Please refer to Figure 2 , Figure 2 The exploded view of the battery 100 provided in some embodiments of the present application. The battery 100 comprises a battery 100 unit and a box 10, and the box 10 is used to accommodate the battery 100 unit (ie, the battery 100 module).

[0087] Among them, the box 10 is a component for accommodating the battery 100 unit, and the box 10 provides a placement space for multiple battery cells 20 in the battery 100 unit. The box 10 can adopt a variety of structures. In some embodiments, the box 10 may include a tray and a box 10, and the tray and the box 10 cover each other to define a placement space for accommodating the battery cells 20. The tray and the box 10 can be in various shapes, such as a rectangular parallelepiped, a cylinder, etc. The tray can be a hollow structure with one side open, and the box 10 can also be a hollow structure with one side open. The open side of the box 10 covers the open side of the tray, so as to form a box 10 with a placement space. It can also be that the tray is a hollow structure with one side open, and the box 10 is a plate-like structure. The box 10 covers the open side of the tray, so as to form a box 10 with a placement space. As an example, the battery cell 20 can be a cylindrical battery cell 20, a prismatic battery cell 20, or a battery cell 20 of other shapes, and there is no special limitation in this application.

[0088] In the battery 100, there can be one or more battery cells 20. If there are more than one battery cell 20, the battery cells 20 can be connected in series, in parallel or in mixed connection. Mixed connection means that the battery cells 20 are both connected in series and in parallel. The battery 100 unit can be composed of multiple battery cells 20 connected in series, in parallel or in mixed connection, and the battery 100 units are then connected in series, in parallel or in mixed connection to form a whole and accommodated in the box 10. All battery cells 20 can also be directly connected in series, in parallel or in mixed connection, and then the whole formed by all battery cells 20 is accommodated in the box 10.

[0089] The battery cell 20 serves as a battery 100 unit and the smallest energy unit of the battery 100. The battery 100 unit or the battery 100 includes a plurality of battery cells 20. The battery cell 20 includes a shell 21, an end cover 22 and an electrode assembly arranged in the shell 21. The shell 21 is welded to the end cover 22. The large surface of the battery cell 20 is defined by the width edge and the length edge of the shell 21, the small surface of the battery cell 20 is defined by the width edge and the height edge, and the end surface of the battery cell 20 is defined by the length edge and the width edge.

[0090] The battery cell 20 includes: a shell 21, an end cover 22 and an electrode assembly. The shell 21 defines a containing space with a mounting opening, and the electrode assembly and other functional components can be arranged in the containing space. The end cover 22 covers the mounting opening of the shell 21 to isolate the internal environment of the battery cell 20 from the external environment. The shape of the end cover 22 is adapted to the shape of the shell 21. The end cover 22 can be supported by a material with a certain hardness and strength (such as aluminum alloy, carbon fiber plate), and the end cover 22 can effectively protect the safety and reliability of the internal components of the shell 21 during extrusion and collision.

[0091] In some embodiments, the end cap 22 may also be provided with a pressure relief mechanism for releasing the internal pressure when the internal pressure or temperature of the battery cell 20 reaches a threshold value. The material of the end cap 22 may also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application do not impose any special restrictions on this. In some embodiments, an insulating member may also be provided on the inner side of the end cap 22, and the insulating member may be used to isolate the electrical connection components in the housing 21 from the end cap 22 to reduce the risk of short circuit. Exemplarily, the insulating member may be plastic, rubber, etc.

[0092] The shell 21 is a component used to cooperate with the end cap 22 to form the internal environment of the battery cell 20, wherein the formed internal environment can be used to accommodate the electrode assembly, electrolyte and other components. The shell 21 and the end cap 22 can be independent components, and a mounting port can be set on the shell 21, and the internal environment of the battery cell 20 is formed by covering the opening of the end cap 22 at the mounting port. The shell 21 can be of various shapes and sizes, such as a rectangular parallelepiped, a cylindrical shape, a hexagonal prism, etc. Specifically, the shape of the shell 21 can be determined according to the specific shape and size of the electrode assembly. The material of the shell 21 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application do not impose any special restrictions on this.

[0093] The electrode assembly is a component in the battery cell 20 where electrochemical reactions occur. One or more electrode assemblies may be contained in the housing 21. The electrode assembly is mainly formed by winding or stacking positive and negative electrode sheets, and a separator is usually provided between the positive and negative electrode sheets. The parts of the positive and negative electrode sheets with active materials constitute the main body of the electrode assembly, and the parts of the positive and negative electrode sheets without active materials each constitute a tab. The positive tab and the negative tab may be located together at one end of the main body or respectively at both ends of the main body. During the charge and discharge process of the battery 100, the positive active material and the negative active material react with the electrolyte, and the tabs connect the electrode terminals to form a current loop.

[0094] In the prior art, the battery cell 20 is arranged in the box body 10. During the charging and discharging process, the battery cell 20 may swell, and the swollen battery cell 20 squeezes the bottom plate 11 and the bottom guard plate 30, which may cause the shell 21 of the battery cell 20 to rupture, or even leakage, short circuit, thermal runaway, etc., thereby reducing the safety and reliability of the battery 100 and the battery cell 20.

[0095] Therefore, it is necessary to set a buffer space between the bottom guard plate 30 and the bottom plate 11 to buffer the expansion force of the battery cell 20. However, in order to meet the expansion and deformation requirements of the battery cell 20, a buffer structure cannot be set in the buffer space. When the battery 100 is bottomed out, hit by a ball, etc., the edge position (i.e., the edge area) of the battery cell 20 is prone to large deformation, thereby reducing the safety and reliability of the battery cell 20.

[0096] In view of this, the embodiment of the present application provides a battery 100, wherein a buffer space is formed between the bottom guard plate 30 and the bottom plate 11, and a buffer structure is provided on the bottom guard plate 30, and the buffer structure and the bottom plate 11 are connected to each other.

[0097] The edges of the fitting surfaces of the battery cell 20 are opposite to each other. The buffer structure is used to improve the structural strength of the bottom guard plate 30 to improve the battery cell 20's ability to resist ball impacts and improve the stability and safety of the battery cell 20. At the same time, the buffer structure is arranged in the buffer space and is opposite to the edge area of ​​the battery cell 20 where the expansion and deformation are smaller. It has less effect on the expansion absorption of the battery cell 20, and can take into account both the expansion absorption and the structural strength of the box body 10, thereby improving the safety and reliability of the battery 100.

[0098] Reference below Figure 3-Figure 10 A battery 100 and an electric device 200 according to an embodiment of the present invention are described.

[0099] like Figure 3 and Figure 6 As shown, the present application provides a battery 100 , including: a box body 10 , at least one battery cell 20 , and a bottom guard plate 30 .

[0100] Among them, the box body 10 includes a bottom plate 11 and a side plate 12, the side plate 12 is arranged around the peripheral edge of the bottom plate 11, and the side plate 12 and the bottom plate 11 define a accommodating space for accommodating a battery cell 20, the battery cell 20 is arranged in the accommodating space, and the battery cell 20 includes a first surface 20a with the largest surface area among multiple surfaces, the first surface 20a is perpendicular to the first direction and faces the bottom plate 11, and the bottom guard plate 30 is opposite to the bottom plate 11 and is spaced apart along the first direction to form a buffer space.

[0101] It should be pointed out that the battery cell 20 has at least one side surface and two end surfaces, and the surface with the largest surface area among the side surface and the two end surfaces is defined as the first surface 20a. The first surface 20a is in contact with the base plate 11, and the battery cell 20 can be fixed by setting a mounting position on the base plate 11 or by gluing.

[0102] Furthermore, the bottom guard plate 30 is arranged opposite to and spaced from the bottom plate 11 to define a buffer space for buffering the expansion of the battery cell 20. The buffer space is suitable for absorbing the expansion of the battery cell 20 when the battery cell 20 is charged and discharged, so as to avoid the expansion force of the battery cell 20 directly acting on the bottom guard plate 30 and form a safety gap between the bottom guard plate 30 and the bottom plate 11.

[0103] At the same time, the first surface 20a of the battery cell 20 (i.e., the surface with the largest surface area) faces the bottom plate 11 and can be arranged in close contact with the bottom plate 11, which can reduce the restraint on the battery cell 20, especially reduce the restraint force of the first surface 20a, and extend the life of the battery cell 20.

[0104] According to the battery 100 of the embodiment of the present application, a buffer gap can be formed between the bottom guard plate 30 and the bottom plate 11, so that when the battery cell 20 expands, the bottom plate 11 can be squeezed by the battery cell 20 to deform it, thereby releasing part of the space occupied by the buffer gap to accommodate the expansion of the battery cell 20. On the basis that the battery 100 has the ability to resist bottom ball impact, the space originally reserved in the battery 100 to accommodate the expansion of the battery cell 20 can be reduced, so that the overall structure of the battery 100 is more compact and the space utilization rate is higher.

[0105] Furthermore, the battery 100 includes a plurality of battery cells 20 that are opposite to and sequentially arranged along a first direction, and first surfaces 20 a of the plurality of battery cells 20 are all perpendicular to the first direction.

[0106] Exemplarily, the first direction is the height direction, and multiple battery cells 20 can be arranged in the first direction, and the expansion generated by each battery cell 20 is accumulated in the first direction, and can be deformed by squeezing each other and acting together on the bottom plate 11, thereby releasing part of the space occupied by the buffer gap to accommodate the expansion of the battery cell 20, thereby improving the utilization of the space between the bottom plate 11 and the bottom guard plate 30, and allowing more battery cells 20 to be set in the battery 100.

[0107] Furthermore, the battery 100 includes a plurality of battery cells 20 arranged along a second direction, the second direction is perpendicular to the first direction, and the first surfaces 20 a of the plurality of battery cells 20 all face the bottom plate 11 .

[0108] Specifically, taking the first direction as the height direction as an example, the second direction can be the left-right direction and the front-back direction. The battery cells 20 stacked in sequence in the first direction are defined as a cell stack. Then, multiple cell stacks can be arranged in sequence along the left-right direction and / or the front-back direction to form multiple battery cells 20 arranged regularly in the accommodating space, thereby improving space utilization and improving the energy density of the battery 100. At the same time, the battery cells 20 in the multiple battery stacks can all absorb the accumulated expansion along the first direction through the buffer space between the bottom plate 11 and the bottom guard plate 30. Multiple battery stacks can share a buffer space to improve the protection effect of the bottom guard plate 30 on the battery cells 20 and extend the service life of the battery cells 20.

[0109] It should be noted that, when projected along the first direction, the first surfaces 20 a of the plurality of battery cells 20 coincide with the projection of the buffer space.

[0110] That is to say, under the projection in the first direction, the first surface 20a is entirely located in the buffer space, so that the expansion deformation generated in the middle area and the edge area of ​​the first surface 20a can be buffered and absorbed by the buffer space located at one end of the first direction, thereby improving the buffering effect and buffering stability of the buffer space, thereby effectively improving the reliability and safety of the battery 100.

[0111] Furthermore, the box body 10 also includes a reinforcing structure 40, which is connected to the bottom guard plate 30 along the first direction; or the bottom guard plate 30 is formed with a reinforcing structure 40, which is protruding from one side surface of the bottom guard plate 30 along the first direction.

[0112] That is to say, a reinforcing structure 40 is provided on the bottom guard plate 30, and the reinforcing structure 40 is integrally formed with the bottom guard plate 30 (that is, the bottom guard plate 30 protrudes toward the surface of the bottom plate 11 to form the reinforcing structure 40), or is a split structure and is provided on the bottom guard plate 30 (that is, the reinforcing structure 40 is connected to the bottom guard plate 30). The bottom guard plate 30 is a thin plate structure with low structural strength. The reinforcement structure 40 is provided to cooperate with the bottom guard plate 30 to increase the overall structural strength.

[0113] It can be understood that in the embodiment where the reinforcing structure 40 is connected to the bottom guard plate 30, the reinforcing structure 40 is located between the bottom guard plate 30 and the bottom plate 11. In the embodiment where the surface of the bottom guard plate 30 protrudes toward the bottom plate 11 to form the reinforcing structure 40, the surface of the bottom guard plate 30 facing away from the bottom plate 11 is recessed to form the reinforcing structure 40. That is, the processing of the bottom guard plate 30 and the reinforcing structure 40 can be achieved by stamping, which has lower processing difficulty, higher efficiency, and lower cost.

[0114] According to some embodiments of the present application, the protrusion height of the reinforcement structure 40 is 1 mm to 4 mm.

[0115] Exemplarily, the protrusion height of the reinforcement structure 40 is 1 mm, 2 mm, 3 mm, 4 mm, etc.

[0116] In this way, the protrusion height of the reinforcing structure 40 can be made more reasonable. On the one hand, sufficient buffer space can be reserved for the edge area of ​​the battery cell 20 to effectively absorb the expansion force of the battery cell 20; on the other hand, the protrusion height of the protrusion structure can meet the structural strength requirements and avoid the protrusion height being too low, so that the protective performance of the bottom guard plate 30 is better.

[0117] See also Figure 8 and Fig. 9 As shown, according to some embodiments of the present application, the reinforcing structure 40 is spaced apart from the bottom plate 11 , that is, the protruding height of the reinforcing structure 40 is smaller than the gap between the bottom plate 11 and the bottom guard plate 30 .

[0118] Exemplarily, the gap between the bottom guard plate 30 and the bottom plate 11 is 4 mm, and the gap between the reinforcement structure 40 and the bottom plate 11 is 2 mm.

[0119] In this way, there is a certain gap between the reinforcing structure 40 and the bottom plate 11 , which can absorb the expansion of the edge area of ​​the bonding surface defined by the battery cell 20 to further improve the buffering stability and reliability, thereby improving the stability and safety of the battery 100 .

[0120] In some embodiments, the first surface 20a includes: an edge along a second direction, the second direction is perpendicular to the first direction, and a projection of the reinforcement structure 40 of the battery 100 along the first direction covers a projection of the edge along the first direction.

[0121] Among them, the first direction is the height direction, and the second direction is the horizontal direction, such as the left-right direction, the front-back direction, etc.

[0122] Exemplarily, taking the first direction as the height direction as an example, in the height direction, the projection of the edge is located within the projection contour of the reinforcement structure 40 .

[0123] The bottom guard plate 30 is spaced from the bottom plate 11, and the spacing area is formed as a buffer space. Optionally, a buffer space with a height dimension of 3% to 35% of the thickness dimension of the battery cell 20 should be reserved between the bottom plate 11 and the bottom guard plate 30. When the battery cell 20 expands, the bottom plate 11 can bulge downward and invade into the buffer space to absorb the expansion of the battery cell 20, so that the battery cell 20 can release the expansion force stably and reliably.

[0124] However, in order to meet the expansion space size of the battery cell 20, a buffer structure cannot be set between the bottom plate 11 and the bottom guard plate 30, resulting in a higher risk of ball impact for the battery 100 as a whole. When the edge of the battery cell 20 (the edge that defines the fitting surface) is hit, it is easy to cause the battery cell 20 to deform to a large extent, and even cause the shell 21 of the battery cell 20 to rupture, thereby causing dangerous situations such as leakage and thermal runaway.

[0125] Based on this, the present application sets a reinforcing structure 40 on the bottom guard plate 30, and the reinforcing structure 40 can improve the structural strength of the bottom guard plate 30. Taking a single battery cell 20 as an example, the edge of the first surface 20a of the single battery cell 20 is located within the projection contour of the reinforcing structure 40 (overlapping or located within it), and the intersection area of ​​the two surfaces of the battery cell 20 is defined as the edge. The edge can be narrowly understood as a straight line, and the edge can also be broadly understood as an arc surface or a curved surface defined by the intersection area of ​​the two surfaces, and the arc surface or the curved surface is located within the projection range of the reinforcing structure 40.

[0126] It can be understood that the battery cell 20 defines that the expansion deformation of the edge area of ​​the first surface 20a is smaller than the expansion deformation of the central area of ​​the first surface 20a, and the projection of at least part of the edge of the first surface 20a is located within the projection contour of the reinforcing structure 40 (such as: the first surface 20a has four edges, and one, two, three or four of them are located within the projection contour of the reinforcing structure 40), that is, the reinforcing structure 40 is arranged on the area of ​​the bottom guard plate 30 corresponding to the smaller expansion deformation of the battery cell 20, so that the structural reinforcement of the bottom guard plate 30 is realized to improve the protective performance of the bottom guard plate 30, so that the central area of ​​the first surface 20a still has sufficient buffer space to take into account the expansion absorption of the battery cell 20, and more importantly, the reinforcing structure 40 is opposite to at least part of the edge of the single battery cell 20 in the height direction (such as: facing, at least partially facing), and the edge area is more likely to deform when hit by a ball. The targeted setting of the reinforcing structure 40 can especially improve the ball hit protection capability.

[0127] Therefore, on the one hand, the structure of the bottom guard plate 30 can be effectively strengthened, and the buffer space can also meet the expansion requirements of the battery cell 20, so as to take into account the absorption of the expansion force of the battery cell 20 and the protective performance of the bottom guard plate 30, thereby overcoming the technical constraints of the prior art that a reinforcing structure 40 cannot be set on the bottom guard plate 30 due to the expansion requirements. On the other hand, the targeted setting of the reinforcing structure 40 can further improve the ball impact protection performance of the bottom guard plate 30.

[0128] According to some embodiments of the present application, the reinforcement structure 40 is configured as one or more of a reinforcement rib and a reinforcement beam.

[0129] For example, Figure 6 , Figure 7 and Fig. 9 As shown, in some embodiments, the reinforcing structure 40 is constructed as a reinforcing rib, which can be directly integrally formed on the bottom guard plate 30, with low processing difficulty and low cost. The shape of the reinforcing rib can be L-shaped, U-shaped, V-shaped, C-shaped, arc-shaped, etc. In other embodiments, the reinforcing structure 40 can be constructed as a reinforcing beam, which is welded or glued to the bottom guard plate 30, thereby having a better structural reinforcement effect on the bottom guard plate 30.

[0130] Of course, the specific structural form of the reinforcement structure 40 of the embodiment of the present application is not limited thereto. In other embodiments, the reinforcement structure 40 may include a first part and a second part, the first part being constructed as a reinforcement rib, and the second part being constructed as a reinforcement beam. The first part and the second part may be separated by a projection contour in the height direction, or at least part of the projection contour may overlap, or be connected. In still other embodiments, the reinforcement structure 40 may not be constructed as a reinforcement rib or a reinforcement beam, and a foam structure may be selected. The foam structure is constructed in a grid shape to adapt to the technical solution of multiple battery cells 20.

[0131] Combination Figure 6 and Figure 7 As shown, according to some embodiments of the present application, the reinforcement structure 40 protrudes toward the bottom plate 11 .

[0132] That is to say, the reinforcing structure 40 is formed on the side of the bottom guard plate 30 facing the bottom plate 11, and the surface of the bottom guard plate 30 facing the bottom plate 11 is defined as the upper surface, and the surface of the bottom guard plate 30 opposite to the first surface 20a is defined as the lower surface. The reinforcing structure 40 is located above the upper surface and protrudes toward the bottom plate 11, and the surface of the side of the reinforcing structure 40 away from the lower surface can be a plane or a curved surface.

[0133] Therefore, by setting the reinforcing structure 40, while achieving structural reinforcement of the bottom guard plate 30 and meeting the buffer space requirements, the area forming the reinforcing structure 40 can be recessed toward the upper surface, or the lower surface can be kept flat, and the probability of the battery 100 being supported or scratched can be reduced.

[0134] Combination Figure 4 , Figure 5 as well as Fig.10 As shown, according to some embodiments of the present application, the battery cell 20 includes a first edge and a second edge relatively arranged along a second direction, the reinforcement structure 40 includes a first reinforcement portion and a second reinforcement portion, the projection of the first reinforcement portion along the first direction covers the projection of the first edge along the first direction, the projection of the second reinforcement portion along the first direction covers the projection of the second edge along the first direction, and the first reinforcement portion and the second reinforcement portion are arranged at intervals.

[0135] Among them, the battery cell 20 has a first edge (i.e., a length edge), a second edge (i.e., a width edge) and a third edge (following the height edge). The first edge and the second edge define the large surface of the battery cell 20 (i.e., the first surface 20a), the first edge and the third edge define the end surface of the battery cell 20, and the second edge and the third edge define the small surface of the battery cell 20.

[0136] Specifically, the first edge can be a length edge, the second edge can be a width edge, and the third edge can be a height edge, so as to define the large surface of the battery cell 20, the small surface of the battery cell 20 and the end surface of the battery cell 20 through the cooperation of the first edge, the second edge and the third edge respectively. The surface area of ​​the large surface of the battery cell 20 is the largest, which is defined as the first surface 20a. The contact area between the battery cell 20 and the bottom plate 11 is larger, the large surface of the battery cell 20 is less constrained, the expansion deformation is larger, and the expansion force is smaller, which can extend the life of the battery cell 20.

[0137] It should be pointed out that in order to leave enough space between the bottom plate 11 and the bottom guard plate 30 for the battery cell 20 to expand, the present application distributes the reinforcing structure 40 on the bottom guard plate 30 correspondingly at the edge position that defines the large surface of the battery cell 20. Since the expansion of the edge position of the battery cell 20 is relatively small, a part of the height gap can be used to accommodate the reinforcing structure 40, which not only improves the structural strength of the bottom guard plate 30 to increase the bottom ball protection effect, but also does not affect the expansion force absorption effect.

[0138] Combination Figure 3 , Figure 6 , Figure 7 as well as Fig. 9 As shown, according to some embodiments of the present application, the reinforcement structure 40 includes a first reinforcement portion and a second reinforcement portion, and the first reinforcement portion is arranged corresponding to the first edge, such as Figure 4 and Figure 6 As shown, the second reinforcement portion is arranged corresponding to the second edge, and a plurality of second reinforcement portions are all connected to the same first reinforcement portion.

[0139] Specifically, the first edge defining the first surface 20a includes two opposite first edges, and a first reinforcement portion can be set on both first edges or at least one of them. The second edge defining the first surface 20a includes two opposite second edges, and a second reinforcement portion can be set on both second edges or at least one of them.

[0140] In this way, not only can the structural strength of the bottom guard plate 30 be improved by the first reinforcement portion, but the first reinforcement portion is also arranged corresponding to the first edge, and the expansion deformation of the first edge area is smaller, so that the first reinforcement portion has a smaller impact on the expansion space occupancy, while taking into account the expansion absorption of the battery cell 20.

[0141] Therefore, on the one hand, by setting a second reinforcement portion corresponding to the second edge and connecting the second reinforcement portion with the first reinforcement portion, the structure of the bottom guard plate 30 in the direction of the second edge can be enhanced, thereby further improving the structural strength of the bottom guard plate 30. On the other hand, the second reinforcement portion can also take into account the absorption of the expansion force of the battery cell 20.

[0142] In addition, it can be understood that the first reinforcement portion and the second reinforcement portion are arranged at intervals, so that the spacing space between the first reinforcement portion and the second reinforcement portion can at least partially overlap with the first surface 20a, so that the expansion force and expansion deformation of the angular area where the first edge and the second edge intersect can be released into the spacing space, thereby improving the buffering effect and further improving the protection effect on the battery cell 20.

[0143] Further, the battery cell 20 includes a first battery cell 20 and a second battery cell 20 adjacent to each other along a second direction, the first battery cell 20 includes a first edge, the second battery cell 20 includes a second edge, the first edge and the second edge are adjacent to each other along the second direction, the reinforcement structure 40 includes a first reinforcement portion, projected along the first direction, the projection of the same first reinforcement portion covers at least a portion of the first edge and at least a portion of the second edge, the first edge and the second edge are both perpendicular to the second direction, or the first edge and the second edge are parallel to the second direction.

[0144] That is to say, the first edge of the first battery cell 20 and the second edge of the second battery cell 20 may be adjacent, the end of the first edge is adjacent to the end of the second edge, or the side of the first edge is adjacent to the side of the second edge. For example, the sides of the battery cells 20 are arranged in sequence in the second direction relative to each other, and the first edge and the second edge may both be width edges or both be length edges. The first edge and the second edge may correspond to the same first reinforcement portion, which can increase the size of the reinforcement structure 40, improve the structural strength of the bottom guard plate 30, and the number of first reinforcement portions provided can be smaller, the design difficulty and processing difficulty can also be lower, and the cost of the bottom guard plate 30 can be further reduced.

[0145] According to some embodiments of the present application, the battery cell 20 includes a shell 21 and an end cover 22, the end cover 22 is connected to the shell 21 to form a connecting portion, and the projection of the reinforcing structure 40 along the first direction is completely misaligned with the projection of the connecting portion along the first direction.

[0146] That is to say, the end cover 22 covers the shell 21, and the connection area between the end cover 22 and the shell 21 forms a connection portion, and the connection portion is a weak area of ​​the battery cell 20. If the end cover 22 and the shell 21 are welded and fixed, the weld and the heat-affected area will become structural weak areas. In the technical solution in which the first surface 20a is bonded to the bottom plate 11, when the impact occurs in the weld or the heat-affected area, it is more likely to cause the battery cell 20 to have dangerous situations such as leakage and thermal runaway.

[0147] Based on this, the present application completely misaligns the projection of the reinforcing structure 40 and the connecting part in the first direction, that is, the reinforcing structure 40 is not provided in the area where the connecting part is located, so that the distance between the structurally weak area of ​​the battery cell 20 and the bottom guard plate 30 can be larger, the protection effect of the structurally weak area (that is, the connecting part) is better, and the stability and safety of the battery 100 are higher.

[0148] like Figure 4 , Figure 5 and Figure 8 As shown, according to some embodiments of the present application, the box body 10 further includes an elastic member 50, which is disposed between the bottom plate 11 and the bottom guard plate 30, and the projection of the elastic member 50 along the first direction covers the projection of the connecting portion along the first direction.

[0149] In other words, the elastic member 50 is disposed on the bottom guard plate 30 or the bottom plate 11 , and is disposed opposite to the connecting portion in the height direction.

[0150] Specifically, in some embodiments, the elastic member 50 is disposed on the bottom guard plate 30 and is disposed opposite to the bottom plate 11. In other embodiments, the elastic member 50 is disposed on the bottom plate 11 and is disposed opposite to the bottom guard plate 30, and the elastic member 50 is disposed opposite to the connecting part in the height direction (e.g., the projection contour of the connecting part falls within the contour range of the elastic member 50).

[0151] Exemplarily, the end cover 22 is welded to the shell 21, the battery cell 20 includes a heat-affected portion, the heat-affected portion includes a shell portion on the shell 21 with a spacing less than or equal to 5 mm from the connecting portion, and the projection of the reinforcement structure 40 along the first direction is completely misaligned with the projection of the heat-affected portion along the first direction.

[0152] Therefore, by providing the elastic member 50, the protective effect of the area where the second sub-edge is located can be improved, the probability of rupture failure in the heat-affected part and the area where the weld is located (i.e., the connecting part) can be reduced, and the stability and reliability of the battery cell 20 can be improved. At the same time, according to the expansion and deformation distribution of the battery cell 20, the expansion of the connecting part and the heat-affected part is relatively small, and the elastic member 50 can also avoid excessive local stress in the area where the connecting part and the heat-affected part are located, so as to extend the life of the battery cell 20.

[0153] According to some embodiments of the present application, the battery 100 includes n layers of battery cells 20 stacked along a first direction, the thickness dimension of the battery cell 20 along the first direction is D, the maximum distance between the bottom plate 11 and the bottom guard plate 30 along the first direction is H, and the battery 100 satisfies: H≥n*D, 1≤n≤4, 25m≤D≤80mm, H≥5mm. In other words, the height dimension of a single battery cell 20 is 25mm~80mm, the number of battery cells 20 is 1~4, and the height of the battery 100 is greater than the height of the battery stack by no less than 5mm.

[0154] As a result, the number of battery cells 20 in each battery stack is not less than 1 and not more than 4, which can take into account both the buffering effect and the space utilization. The height of the battery 100 exceeds the height of the battery stack by 5 mm, which makes it easier to arrange the buffer space and provides a better buffering effect.

[0155] Furthermore, the battery 100 satisfies: H≥n*D, n=2, 45mm≤D≤55mm, H≥9mm.

[0156] Exemplarily, the number of battery cells 20 in the battery stack is two, the height of the battery stack is 110 mm, and the height of the battery 100 is 119 mm.

[0157] like Figure 6 and Figure 7 As shown, according to some embodiments of the present application, in the direction of the first edge, the battery cells 20 define a battery column 100 , and the length of the first reinforcement portion is less than or equal to the length of the battery column 100 .

[0158] As a result, the length of the first reinforcement portion is made more reasonable. While strengthening the structure of the bottom guard plate 30, under the projection in the height direction, the area of ​​the bottom guard plate 30 located outside the range of the battery cell 20 does not need to be provided with the first reinforcement portion. The flatness of this area is higher, which can reduce the deformation of the bottom guard plate 30 during the processing and improve the flatness of the bottom guard plate 30.

[0159] In a second aspect, the present application provides an electrical device 200, comprising: the battery 100 described in the above embodiment.

[0160] Other structures and operations of the battery 100 and the electrical device 200 according to the embodiment of the present invention are known to those skilled in the art and will not be described in detail here.

[0161] Furthermore, the battery 100 includes an upper cover, which is arranged opposite to the bottom plate 11 along a first direction, and the electrical device 200 includes a first component facing the upper cover, which is spaced apart from the upper cover.

[0162] Therefore, the deformation of the upper cover can be absorbed by the gap between the first component and the upper cover, that is, deformation space is reserved for the upper cover to avoid the expansion deformation of the first surface 20a being transmitted to the upper cover. The upper cover and the first component are rigidly connected without deformation space, which causes damage to the battery cell 20, and the protection effect can be further improved.

[0163] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0164] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A battery, characterized in that: include: A box body (10), the box body (10) comprising a bottom plate (11) and a side plate (12), the side plate (12) being arranged around the peripheral edge of the bottom plate (11), and the side plate (12) and the bottom plate (11) defining a containing space; A battery cell (20), the battery cell (20) being arranged in the accommodating space, and the battery cell (20) comprising a first surface (20a) having the largest surface area among a plurality of surfaces, the first surface (20a) being perpendicular to a first direction and facing the bottom plate (11); A bottom guard plate (30), the bottom guard plate (30) and the bottom plate (11) are arranged opposite to each other and spaced apart along the first direction to form a buffer space.

2. The battery according to claim 1, characterized in that The battery comprises a plurality of battery cells (20) arranged opposite to each other and in sequence along the first direction, and the first surfaces (20a) of the plurality of battery cells (20) are all perpendicular to the first direction.

3. The battery according to claim 1, characterized in that The battery comprises a plurality of battery cells (20) arranged along a second direction, the second direction being perpendicular to the first direction, and the first surfaces (20a) of the plurality of battery cells (20) all face the bottom plate (11).

4. The battery according to claim 3, characterized in that Projected along the first direction, the first surfaces (20a) of the plurality of battery cells (20) coincide with the projection of the buffer space.

5. The battery according to claim 1, characterized in that The box body (10) further comprises a reinforcing structure (40), wherein the reinforcing structure (40) is connected to the bottom guard plate (30) along the first direction; or, The bottom guard plate (30) is formed with the reinforcement structure (40), and the reinforcement structure (40) is protruding from a side surface of the bottom guard plate (30) along the first direction.

6. The battery according to claim 5, characterized in that The reinforcement structure (40) is connected to the bottom guard plate (30), and the reinforcement structure (40) is located between the bottom guard plate (30) and the bottom plate (11).

7. The battery according to claim 5, characterized in that The bottom guard plate (30) is convex toward the surface of the bottom plate (11), and the bottom guard plate (30) is concave toward the surface of the bottom plate (11), so as to form the reinforcement structure (40).

8. The battery according to any one of claims 5 to 7, characterized in that: The maximum dimension of the reinforcement structure (40) along the first direction is 1 mm to 4 mm.

9. The battery according to claim 5, characterized in that The reinforcement structure (40) is spaced apart from the bottom plate (11).

10. The battery according to claim 1, characterized in that The first surface (20a) includes an edge along a second direction, the second direction being perpendicular to the first direction, and the battery further includes a reinforcing structure (40), the projection of the reinforcing structure (40) along the first direction covering the projection of the edge along the first direction.

11. The battery according to claim 10, characterized in that The first surface (20a) includes a first edge and a second edge arranged opposite to each other along the second direction, and the reinforcing structure (40) includes a first reinforcing portion and a second reinforcing portion, the projection of the first reinforcing portion along the first direction covers the projection of the first edge along the first direction, the projection of the second reinforcing portion along the first direction covers the projection of the second edge along the first direction, and the first reinforcing portion and the second reinforcing portion are arranged at intervals.

12. The battery according to claim 10, characterized in that The battery cell (20) comprises a first battery cell (20) and a second battery cell (20) adjacent to each other along the second direction, the first battery cell (20) comprises a first edge, the second battery cell (20) comprises a second edge, the first edge and the second edge are adjacent to each other along the second direction, the reinforcing structure (40) comprises a first reinforcing portion, and when projected along the first direction, the projection of the same reinforcing structure (40) covers at least a portion of the first edge and at least a portion of the second edge, the first edge and the second edge are both perpendicular to the second direction, or the first edge and the second edge are parallel to the second direction.

13. The battery according to claim 10, characterized in that The battery cell (20) comprises a shell (21) and an end cover (22), the end cover (22) being connected to the shell (21) to form a connecting portion, and a projection of the reinforcing structure (40) along the first direction is completely misaligned with a projection of the connecting portion along the first direction.

14. The battery according to claim 13, characterized in that The box body (10) further comprises an elastic member (50), wherein the elastic member (50) is arranged between the bottom plate (11) and the bottom guard plate (30), and the projection of the elastic member (50) along the first direction covers the projection of the connecting portion along the first direction.

15. The battery according to claim 13, characterized in that The end cover (22) and the shell (21) are welded together, the battery cell (20) comprises a heat-affected portion, the heat-affected portion comprises a shell portion on the shell (21) with a spacing of less than or equal to 5 mm from the connecting portion, and a projection of the reinforcement structure (40) along the first direction is completely misaligned with a projection of the heat-affected portion along the first direction.

16. The battery according to claim 1, characterized in that The battery comprises n layers of battery cells (20) stacked along the first direction, the thickness dimension of the battery cells (20) along the first direction is D, the maximum distance between the bottom plate (11) and the bottom guard plate (30) along the first direction is H, and the battery satisfies: H≥n*D, 1≤n≤4, 25mm≤D≤80mm, H≥5mm.

17. The battery according to claim 16, characterized in that The battery satisfies: H≥n*D, n=2, 45mm≤D≤55mm, H≥9mm.

18. An electrical device, characterized in that: include: The battery according to any one of claims 1 to 17.

19. The electrical device according to claim 18, characterized in that: The battery comprises an upper cover, the upper cover and the bottom plate (11) are arranged opposite to each other along the first direction, and the electrical device comprises a first component facing the upper cover, the first component and the upper cover are arranged at a distance.

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