Battery and electric device

Abstract

The present application discloses a battery and an electric device. The battery comprises battery cells and a case, and the battery cells are accommodated in the case. One side of each battery cell in a first direction is provided with a pressure relief mechanism. The case comprises a first case wall, the pressure relief mechanisms face the first case wall in the first direction, and recess portions are provided on the side of the first case wall facing the pressure relief mechanisms. In the first direction, the recess portions at least partially overlap the pressure relief mechanisms. When thermal runaway occurs in a battery cell, the pressure relief mechanism is actuated to release a substance from the battery cell, thereby reducing the risk of explosion of the battery cell. The recess portions can provide clearances for the pressure relief mechanisms when the pressure relief mechanisms are actuated, thereby reducing interference with the pressure relief mechanisms from the first case wall, increasing the pressure relief rate, and improving the reliability of the battery.

Description

Batteries and electrical devices

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese patent application No. 202420429365.5, filed on March 6, 2024, entitled “Battery and Electrical Device,” the entire contents of which are incorporated herein by reference. Technical Field

[0003] The present application relates to the field of batteries, and in particular to a battery and an electrical device. Background Art

[0004] Batteries are widely used in electronic devices such as mobile phones, laptops, electric vehicles, electric airplanes, electric boats, electric toy cars, electric toy boats, electric toy airplanes and power tools, etc.

[0005] How to improve battery reliability is a research direction in battery technology. Summary of the Invention

[0006] The present application provides a battery and an electrical device, which can improve reliability.

[0007] In a first aspect, the present application provides a battery comprising a battery cell and a housing, wherein the battery cell is housed within the housing. A pressure relief mechanism is provided on one side of the battery cell along a first direction. The housing includes a first wall, wherein the pressure relief mechanism faces the first wall along the first direction, and wherein a recess is provided on a side of the first wall facing the pressure relief mechanism. In the first direction, the recess at least partially overlaps with the pressure relief mechanism.

[0008] In the event of thermal runaway of a battery cell, the pressure relief mechanism activates and releases the contents of the battery cell, thereby reducing the risk of explosion. The recessed portion clears the pressure relief mechanism during activation, reducing interference from the first chamber wall, increasing the pressure relief rate, and improving battery reliability.

[0009] In some embodiments, the pressure relief mechanism includes a pressure relief zone, which comprises a main body and a weakened portion disposed around the main body. In a first direction, the projection of the pressure relief zone lies within the projection of the recessed portion. When the weakened portion ruptures, the recessed portion can clear the main body and provide space for the main body, thereby reducing obstruction of the pressure relief passage by the main body and improving pressure relief efficiency.

[0010] In some embodiments, the battery further comprises a protective layer, at least a portion of which is accommodated in the recess. In a first direction, the protective layer at least partially overlaps with the pressure relief mechanism; and the recess comprises an escape space between the protective layer and the pressure relief mechanism in the first direction.

[0011] The material released by the battery cells during thermal runaway acts on the protective layer, which reduces the thermal shock to the first wall and the amount of heat transferred to it, lowering the risk of melting through the first wall and improving battery reliability. The protective layer only partially fills the recess, creating a relief space. This relief space reduces interference with the pressure relief mechanism, increasing the pressure relief rate and enhancing battery reliability.

[0012] In some embodiments, the protective layer is accommodated in the recess and connected to the first box wall. In the first direction, the depth of the recess is greater than the thickness of the protective layer, thereby forming an escape space.

[0013] In some embodiments, the battery includes multiple battery cells. In a first direction, the protective layer overlaps the pressure relief mechanisms of at least two battery cells. The protective layer can withstand the high-temperature substances released by at least two battery cells, thereby reducing the number of protective layers and simplifying assembly.

[0014] In some embodiments, the battery includes multiple battery cells; multiple protective layers are provided, each corresponding to the pressure relief mechanisms of the multiple battery cells. The protective layers can be flexibly positioned based on the location of the pressure relief mechanisms, thereby reducing the overall amount of protective layers used and increasing the energy density of the battery cells.

[0015] In some embodiments, the battery includes multiple battery cells. In a first direction, the recess overlaps with the pressure relief mechanisms of at least two battery cells. The recess can avoid the pressure relief mechanisms of at least two battery cells, thereby reducing the number of recesses and simplifying the molding difficulty of the first box wall.

[0016] In some embodiments, the battery includes at least one battery column including at least two battery cells arranged along a second direction, the first direction being perpendicular to the second direction, and projections of the pressure relief mechanisms of the battery cells in the battery column in the first direction are all located within the projection of the recess.

[0017] The recess increases the exhaust space inside the box, improving exhaust efficiency. In the event of thermal runaway, the material discharged from the battery cell can enter the recess, guiding its flow, thereby reducing material accumulation and lowering the risk of blockage of the battery cell's pressure relief channel and the risk of melting through the first box wall. This improves exhaust efficiency, reduces the risk of seal failure, and enhances reliability.

[0018] In some embodiments, there are multiple recesses and multiple battery cells, and the pressure relief mechanisms of the multiple battery cells are arranged in a one-to-one correspondence with the multiple recesses.

[0019] In some embodiments, the first wall includes multiple recesses spaced apart along a second direction, with partitions positioned between adjacent recesses. The second direction is perpendicular to the first direction; the partitions include channels connecting adjacent recesses. The provision of partitions enhances the structural strength of the first wall. If a battery cell experiences thermal runaway and releases high-temperature material, the high-temperature material can flow through the channels within the multiple recesses, thereby reducing the accumulation of high-temperature material.

[0020] In some embodiments, the first box wall includes a wall body and a convex portion, the convex portion protrudes from a side of the wall body away from the battery cell, and the concave portion is recessed relative to a surface of the wall body facing the battery cell and corresponds to the position of the convex portion.

[0021] The provision of the convex portion reduces restrictions on the recessed portion's depth, thereby increasing the distance between the first tank wall and the pressure relief mechanism and improving the exhaust space. The concave-convex structure formed by the concave and convex portions improves the structural strength of the first tank wall while minimizing its weight, thereby enhancing the battery's reliability and energy density.

[0022] In some embodiments, the wall body and the protrusion are integrally formed to reduce assembly processes and improve sealing performance.

[0023] In some embodiments, the first box wall includes a wall body and a cover plate. The wall body has a through hole, and the cover plate is connected to the wall body and covers the through hole. The cover plate and the hole wall of the through hole define a recess. The wall body and the cover plate are formed independently, which can simplify the molding process of the first box wall.

[0024] In some embodiments, at least a portion of the cover plate is accommodated in the through hole, which can provide space for the cover plate, thereby reducing the maximum dimension of the first box wall in the first direction and improving space utilization.

[0025] In some embodiments, the through hole includes a first hole segment and a second hole segment. The first hole segment is located on a side of the second hole segment away from the battery cell, and the first hole segment has a bottom surface surrounding the second hole segment. The battery also includes a protective layer, which is accommodated within the first hole segment. The bottom surface of the protective layer at least partially overlaps with the protective layer in the axial direction of the through hole. The bottom surface of the first hole segment can limit the protective layer, reducing the risk of the protective layer falling onto the pressure relief mechanism.

[0026] In a second aspect, the present application provides an electrical device, which includes a battery provided by any embodiment of the first aspect, and the battery is used to provide electrical energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The features, advantages and technical effects of exemplary embodiments of the present application will be described below with reference to the accompanying drawings.

[0028] FIG1 is a schematic structural diagram of a vehicle provided in some embodiments of the present application;

[0029] FIG2 is a schematic diagram of an explosion of a battery provided in some embodiments of the present application;

[0030] FIG3 is a schematic cross-sectional view of a battery provided in some embodiments of the present application;

[0031] FIG4 is an enlarged schematic diagram of the circle frame in FIG3 ;

[0032] FIG5 is a schematic diagram of the first box wall and the protective layer shown in FIG2 at another angle;

[0033] FIG6 is a schematic diagram of a first box wall and a protective layer of a battery provided in other embodiments of the present application;

[0034] FIG7 is a schematic diagram of a first box wall and a protective layer of a battery provided in some other embodiments of the present application;

[0035] FIG8 is a schematic diagram of a first box wall and a protective layer of a battery provided in some further embodiments of the present application;

[0036] FIG9 is an enlarged schematic diagram of the circle frame of FIG8;

[0037] FIG10 is a partial cross-sectional schematic diagram of batteries provided in some other embodiments of the present application;

[0038] FIG11 is a partial cross-sectional schematic diagram of batteries provided in some other embodiments of the present application;

[0039] FIG12 is a schematic diagram of an explosion of a battery provided in some other embodiments of the present application.

[0040] Description of the accompanying drawings: 1. vehicle; 2. battery; 3. controller; 4. motor; 10. battery cell; 10a. battery array; 11. housing; 111. housing; 112. end cap; 12. electrode assembly; 13. pressure relief mechanism; 131. pressure relief area; 131a. main body; 131b. weak portion; 132. connecting portion; 20. housing; 20a. first housing portion; 20b. second housing portion; 21. first housing wall; 211. recess; 211a. bottom surface of recess; 212. wall body; 2121. through hole; 2122. first hole section; 2123. second hole section; 2124. bottom surface; 213. protrusion; 213a. top surface; 214. partition; 214a. channel; 215. cover plate; 22. first cavity; 23. second cavity; 30, protective layer; 40, explosion-proof valve; G, avoidance space; X, second direction; Y, third direction; Z, first direction. DETAILED DESCRIPTION

[0041] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0042] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first" and "second" 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-secondary relationship.

[0043] References to "embodiments" in this application mean that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments.

[0044] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0045] The term "and / or" in this application simply describes an association between related objects, indicating that three possible relationships exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this application generally indicates that the related objects are in an "or" relationship.

[0046] In the embodiments of this application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components in different embodiments are omitted. It should be understood that the thickness, length, width, and other dimensions of the various components in the embodiments of this application, as well as the overall thickness, length, width, and other dimensions of the integrated device shown in the drawings are merely illustrative and should not constitute any limitation on this application.

[0047] The term "plurality" used in this application refers to two or more (including two).

[0048] In the embodiments of the present application, a battery may refer to a single physical module including one or more battery cells to provide higher voltage and capacity.

[0049] In the embodiment of the present application, the battery cell may be a secondary battery. A secondary battery refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0050] As an example, the battery cell can be a lithium ion battery cell, a sodium ion battery cell, a sodium lithium ion battery cell, a lithium metal battery cell, a sodium metal battery cell, a lithium sulfur battery cell, a magnesium ion battery cell, a nickel hydrogen battery cell, a nickel cadmium battery cell, a lead storage battery cell, etc.

[0051] As an example, the battery cells may be cylindrical, prismatic, soft-pack or other shaped battery cells. Prismatic battery cells include square-shell, blade-shaped, and polygonal batteries. Polygonal batteries may be, for example, hexagonal batteries.

[0052] A battery cell typically includes an electrode assembly. This assembly includes a positive electrode, a negative electrode, and a separator. During the charge and discharge process of a battery cell, active ions (such as lithium ions) are inserted and removed between the positive and negative electrodes. The separator, placed between the positive and negative electrodes, prevents short circuits between the positive and negative electrodes while allowing the active ions to pass through.

[0053] Batteries typically include a casing that encloses one or more battery cells. The casing reduces the risk of liquids or other foreign matter from affecting the battery cells.

[0054] 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.

[0055] In some embodiments, the battery may be an energy storage device, including an energy storage container, an energy storage cabinet, and the like.

[0056] The development of battery technology must take into account multiple design factors at the same time, such as energy density, cycle life, discharge capacity, charge and discharge rate and other performance parameters. In addition, battery reliability must also be considered.

[0057] The pressure relief mechanism on a battery cell has a significant impact on its reliability. For example, short circuits and overcharging can cause thermal runaway within the cell, leading to a sudden increase in pressure. In these situations, the pressure relief mechanism activates to release the internal pressure, preventing explosion or fire.

[0058] A pressure relief mechanism can be an element or component that activates when a battery cell reaches certain conditions. For example, it can be activated to release internal pressure and / or internal materials when the internal pressure or temperature of the battery cell reaches a predetermined threshold. This threshold design varies depending on design requirements. This threshold may depend on the materials of one or more of the positive electrode sheet, negative electrode sheet, electrolyte, and separator in the battery cell.

[0059] The pressure relief mechanism can take the form of an explosion-proof valve, an air valve, a pressure relief valve, or a safety valve, and can specifically employ a pressure-sensitive element or structure. Specifically, when the internal pressure of the battery cell reaches a predetermined threshold, the pressure relief mechanism activates or a weak area within the pressure relief mechanism ruptures, thereby forming a pressure relief channel for internal pressure relief. Alternatively, the pressure relief mechanism can employ a temperature-sensitive element or structure. Specifically, when the internal temperature of the battery cell reaches a predetermined threshold, the pressure relief mechanism activates, thereby forming a pressure relief channel for internal pressure relief. Alternatively, the pressure relief mechanism can be an actively actuated component. For example, the pressure relief mechanism can be actuated upon receiving a control signal from the battery.

[0060] The pressure relief mechanism can also take other forms. For example, the pressure relief mechanism can be a relatively low-strength structure on the battery cell's outer shell. When the battery cell experiences thermal runaway, the relatively low-strength structure cracks or deforms, forming a pressure relief channel for internal pressure relief. For example, the pressure relief mechanism can be a weld mark on the battery cell's outer shell.

[0061] The "activation" mentioned in this application refers to the action of the pressure relief mechanism or its activation to a certain state, so that the internal pressure and / or internal substances of the battery cell can be released. The action produced by the pressure relief mechanism may include but is not limited to: at least a part of the pressure relief mechanism is broken, shattered, torn or opened, etc. When the pressure relief mechanism is actuated, the high-temperature and high-speed substances inside the battery cell will be discharged outward from the actuated part as emissions. In this way, the battery cell can be depressurized under controllable pressure, thereby avoiding potential more serious accidents.

[0062] The emissions from the battery cells mentioned in this application include but are not limited to: electrolyte, dissolved or split positive and negative electrode plates, fragments of separators, high-temperature and high-speed gases generated by the reaction, flames, etc.

[0063] In order to improve the space utilization inside the battery, the distance between the box wall and the pressure relief mechanism is usually reduced; however, when the battery cell experiences thermal runaway, the box wall may block the pressure relief mechanism, thereby reducing the pressure relief efficiency of the battery cell and affecting the reliability of the battery.

[0064] In view of this, an embodiment of the present application provides a technical solution, which provides a recess on the box wall of the box body to avoid the pressure relief mechanism of the battery cell when the battery cell thermal runaways, so that the battery cell can release pressure in time and improve the reliability of the battery.

[0065] The battery cells described in the embodiments of the present application are suitable for use in batteries and electrical devices using the batteries.

[0066] The battery cells, batteries, and electrical devices disclosed in the embodiments of the present application can be used in electrical devices that use batteries as power sources or various energy storage systems that use batteries as energy storage elements. The electrical devices can be, but are not limited to, mobile phones, tablets, laptops, electric toys, power tools, battery-powered vehicles, electric vehicles, ships, spacecraft, and the like. Among them, electric toys can include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, and the like, and spacecraft can include airplanes, rockets, space shuttles, and spacecraft, and the like.

[0067] For the convenience of description, the following embodiments are described by taking a vehicle as an example of an electrical device.

[0068] FIG1 is a schematic structural diagram of a vehicle provided in some embodiments of the present application.

[0069] As shown in FIG1 , a battery 2 is provided inside the vehicle 1. The battery 2 may be provided at the bottom, head, or tail of the vehicle 1. The battery 2 may be used to power the vehicle 1. For example, the battery 2 may serve as an operating power source for the vehicle 1.

[0070] The vehicle 1 may further include a controller 3 and a motor 4 . The controller 3 is used to control the battery 2 to supply power to the motor 4 , for example, to meet the power requirements of the vehicle 1 during startup, navigation, and driving.

[0071] In some embodiments of the present application, the battery 2 can not only serve as the operating power source of the vehicle 1, but also serve as the driving power source of the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.

[0072] Figure 2 is an exploded schematic diagram of a battery provided in some embodiments of the present application; Figure 3 is a cross-sectional schematic diagram of a battery provided in some embodiments of the present application; Figure 4 is an enlarged schematic diagram of the circle frame in Figure 3; and Figure 5 is a schematic diagram of the first box wall and protective layer shown in Figure 2 at another angle.

[0073] 2 to 5 , an embodiment of the present application provides a battery 2 , which includes a battery cell 10 and a box 20 , wherein the battery cell 10 is accommodated in the box 20 .

[0074] In the battery 2, there can be one or more battery cells 10. If there are multiple battery cells 10, the multiple battery cells 10 can be connected in series, in parallel, or in a hybrid connection. A hybrid connection refers to a combination of series and parallel connections among the multiple battery cells 10. The multiple battery cells 10 can be directly connected in series, in parallel, or in a hybrid connection, and then the entire battery cell 10 can be housed in the housing 20. Alternatively, multiple battery cells 10 can be first connected in series, in parallel, or in a hybrid connection to form a battery module, and then the multiple battery modules can be connected in series, in parallel, or in a hybrid connection to form a single unit and housed in the housing 20.

[0075] The housing 20 may be an outer envelope of the battery 2, with the battery cells 10 located inside the outer envelope. The housing 20 may block external foreign matter (such as liquids or particles), thereby reducing the effect of external foreign matter on the charging or discharging of the battery cells 10.

[0076] In some embodiments, the box body 20 may include a first box body portion 20 a and a second box body portion 20 b . The first box body portion 20 a and the second box body portion 20 b cover each other, and the first box body portion 20 a and the second box body portion 20 b together define an accommodating space for accommodating the battery cell 10 .

[0077] In some examples, the second box portion 20b can be a hollow structure with one end open, and the first box portion 20a is a plate-shaped structure, with the first box portion 20a covering the open side of the second box portion 20b to form the box 20 with a storage space. In other examples, the first box portion 20a and the second box portion 20b can both be hollow structures with one end open, with the open side of the first box portion 20a covering the open side of the second box portion 20b to form the box 20 with a storage space.

[0078] The first box portion 20a and the second box portion 20b can be in various shapes, such as a cylinder, a rectangular parallelepiped, etc.

[0079] In some embodiments, the battery 2 further includes a sealant (not shown) disposed between the first housing portion 20a and the second housing portion 20b to improve sealing after the first housing portion 20a and the second housing portion 20b are connected. For example, the sealant may be a sealant or a sealing ring.

[0080] In some embodiments, the battery cell 10 includes a housing 11 and an electrode assembly 12 accommodated in the housing 11 .

[0081] The housing 11 is hollow, forming a space within which the electrode assembly 12 and the electrolyte are housed. The shape of the housing 11 can be determined based on the specific shape of the electrode assembly 12. For example, if the electrode assembly 12 is a rectangular parallelepiped, a rectangular housing can be used; if the electrode assembly 12 is a cylindrical structure, a cylindrical housing can be used.

[0082] As an example, the housing 11 includes a shell 111 and an end cover 112 . The shell 111 has an opening, and the end cover 112 is used to cover the opening.

[0083] The housing 111 is a component used to cooperate with the end cover 112 to form an internal cavity of the battery cell 10. The formed internal cavity can be used to accommodate the electrode assembly 12, electrolyte and other components.

[0084] The housing 111 and the end cap 112 may be separate components. For example, an opening may be provided on the housing 111 , and the end cap 112 may be placed over the opening to form an internal cavity of the battery cell 10 .

[0085] The housing 111 can have various shapes and sizes, such as a rectangular parallelepiped, a cylindrical shape, a hexagonal prism, etc. Specifically, the shape of the housing 111 can be determined based on the specific shape and size of the electrode assembly 12. The housing 111 can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, etc., and the present embodiment does not impose any particular limitation on this.

[0086] The shape of the end cap 112 can be adapted to the shape of the housing 111 to fit the housing 111. The material of the end cap 112 can be the same as or different from the material of the housing 111. Optionally, the end cap 112 can be made of a material with a certain hardness and strength (e.g., copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.). In this way, the end cap 112 is less likely to deform when squeezed or collided, thereby providing the battery cell 10 with higher structural strength and improved reliability.

[0087] The end cover 112 is connected to the housing 111 by welding, bonding, clamping or other methods.

[0088] The housing 111 may be open at one end or at both ends. In some examples, the housing 111 may be open at one end, with one end cap 112 provided to cover the housing 111. In other examples, the housing 111 may be open at both ends, with two end caps 112 provided to cover the two openings of the housing 111, respectively.

[0089] In some embodiments, the battery cell 10 includes a pressure relief mechanism 13. For example, the pressure relief mechanism 13 can be actuated to release gas within the housing 11 when the internal pressure or temperature of the battery cell 10 reaches a threshold.

[0090] In some embodiments, the pressure relief mechanism 13 is disposed on the housing 11 .

[0091] In some embodiments, the pressure relief mechanism 13 is disposed on the end cap 112. In some examples, the pressure relief mechanism 13 and the end cap 112 are independently formed components, and the pressure relief mechanism 13 and the end cap 112 can be connected by welding, bonding, or other means. In other examples, the pressure relief mechanism 13 and the end cap 112 are an integrally formed structure.

[0092] In some embodiments, the pressure relief mechanism 13 is disposed in the housing 111. In some examples, the pressure relief mechanism 13 and the housing 111 are independently formed components, and the pressure relief mechanism 13 and the housing 111 can be connected by welding, bonding, or other means. In other examples, the pressure relief mechanism 13 and the housing 111 are an integrally formed structure.

[0093] In some embodiments, the battery 2 includes a housing 20 and a battery cell 10 housed within the housing 20. A pressure relief mechanism 13 is provided on one side of the battery cell 10 along a first direction Z. The housing 20 includes a first wall 21, and the pressure relief mechanism 13 faces the first wall 21 along the first direction Z. A recess 211 is provided on the side of the first wall 21 facing the pressure relief mechanism 13. In the first direction Z, the recess 211 at least partially overlaps with the pressure relief mechanism 13.

[0094] As an example, the first box wall 21 may be a top wall located above the battery cell 10 , a bottom wall located below the battery cell 10 , or a side wall of the box body 20 located on one side of the battery cell 10 .

[0095] As an example, the first box wall 21 may be a part of the first box body portion 20 a or a part of the second box body portion 20 b .

[0096] The first box wall 21 can be in a flat plate shape, a curved plate shape or other shapes.

[0097] The first box wall 21 can be an integrally formed structure, or can be formed by connecting a plurality of independent components.

[0098] There may be one or more battery cells 10. For example, there are multiple battery cells 10. Optionally, the pressure relief mechanisms 13 of the multiple battery cells 10 are all facing the first box wall 21.

[0099] The first box wall 21 may have one recess 211 or may have multiple recesses 211 .

[0100] In some examples, the recess 211 partially overlaps with the pressure relief mechanism 13 in the first direction Z; in other words, the projection of the recess 211 along the first direction Z partially overlaps with the projection of the pressure relief mechanism 13 along the first direction Z. In other examples, the recess 211 completely overlaps with the pressure relief mechanism 13 in the first direction Z; in other words, the projection of the recess 211 along the first direction Z completely overlaps with the projection of the pressure relief mechanism 13 along the first direction Z.

[0101] Optionally, in the first direction Z, the projection of the pressure relief mechanism 13 is located within the projection of the recess 211 .

[0102] As an example, there are multiple battery cells 10 , and one recess 211 may overlap with the pressure relief mechanism 13 of only one battery cell 10 in the first direction Z, or may overlap with the pressure relief mechanisms 13 of multiple battery cells 10 in the first direction Z at the same time.

[0103] When a battery cell 10 experiences thermal runaway, the pressure relief mechanism 13 activates and releases the contents of the battery cell 10, thereby reducing the risk of explosion of the battery cell 10. The recess 211 can avoid the pressure relief mechanism 13 when activated, thereby reducing interference with the pressure relief mechanism 13 by the first box wall 21, increasing the pressure relief rate, and improving the reliability of the battery 2.

[0104] In addition, the recess 211 can also reduce the weight of the box 20 and increase the energy density of the battery 2 .

[0105] In some embodiments, the first direction Z may be parallel to the vertical direction. When the battery 2 is installed in an electrical device, the first box wall 21 may be located at the bottom side of the battery cell 10 or at the top side of the battery cell 10 .

[0106] In some embodiments, the pressure relief mechanism 13 includes a pressure relief area 131 , and the pressure relief area 131 includes a main body 131 a and a weak portion 131 b disposed around the main body 131 a .

[0107] The weak portion 131b is a relatively weak portion of the pressure relief mechanism 13, which is a portion that is easily broken, shattered, torn or opened. For example, the strength of the pressure relief mechanism 13 is less than the strength of the portion of the pressure relief mechanism 13 near the weak portion 131b.

[0108] The weak portion 131 b can be ruptured when the internal pressure or temperature of the battery cell 10 reaches a threshold value to release the substance in the outer case 11 .

[0109] In some examples, the present application may provide grooves, notches, or other structures in a predetermined region of the pressure relief mechanism 13 to reduce the local strength of the pressure relief mechanism 13, thereby forming a weak portion 131b on the pressure relief mechanism 13. For example, a thinning process may be performed on the predetermined region of the pressure relief mechanism 13, and the thinned portion of the pressure relief mechanism 13 forms the weak portion 131b. In other examples, a material treatment may be performed on the predetermined region of the pressure relief mechanism 13 to make the strength of the region weaker than that of other regions. In other words, the region serves as the weak portion 131b.

[0110] In some examples, the weak portion 131b is annular and surrounds the main portion 131a. In other examples, the ends of the weak portion 131b are not closed, and the line connecting the two ends of the weak portion 131b and the weak portion 131b together define the main portion 131a. For example, the weak portion 131b is U-shaped.

[0111] After at least a portion of the weak portion 131 b is ruptured, the main body portion 131 a may be turned over or fly out under the internal pressure of the battery cell 10 .

[0112] In some embodiments, the pressure relief mechanism 13 only includes the pressure relief area 131 ; the pressure relief mechanism 13 and the end cover 112 are integrally formed, or the pressure relief mechanism 13 and the housing 111 are integrally formed.

[0113] In other embodiments, the pressure relief mechanism 13 further includes a connecting portion 132, and the weak portion 131b connects the main portion 131a and the connecting portion 132. The connecting portion 132 is connected to the housing 11. For example, the connecting portion 132 is welded to the end cover 112 or the housing 111.

[0114] In some embodiments, in the first direction Z, the projection of the pressure relief area 131 is located within the projection of the recess 211 .

[0115] For example, the pressure relief area 131 may be a portion of the pressure relief mechanism 13 that is used to open and form a pressure relief channel.

[0116] When the weak portion 131b ruptures, the recess 211 can avoid the entire main body 131a and provide an accommodating space for the main body 131a, thereby reducing the obstruction of the pressure relief channel by the main body 131a and improving the pressure relief efficiency.

[0117] In some embodiments, in the first direction Z, the projection of the pressure relief mechanism 13 is located within the projection of the recess 211 .

[0118] In some embodiments, the battery 2 further includes a protective layer 30, at least partially contained within the recess 211. The protective layer 30 at least partially overlaps the pressure relief mechanism 13 in the first direction Z. The recess 211 includes a relief space G between the protective layer 30 and the pressure relief mechanism 13 in the first direction Z.

[0119] The protective layer 30 may be entirely accommodated in the recess 211 , or only partially accommodated in the recess 211 .

[0120] In some examples, the protective layer 30 partially overlaps with the pressure relief mechanism 13 in the first direction Z; in other words, the projection of the protective layer 30 along the first direction Z partially overlaps with the projection of the pressure relief mechanism 13 along the first direction Z. In other examples, the protective layer 30 completely overlaps with the pressure relief mechanism 13 in the first direction Z; in other words, the projection of the protective layer 30 along the first direction Z completely overlaps with the projection of the pressure relief mechanism 13 along the first direction Z. Optionally, in the first direction Z, the projection of the pressure relief mechanism 13 is located within the projection of the protective layer 30.

[0121] As an example, there are multiple battery cells 10 , and the protective layer 30 may overlap with the pressure relief mechanism 13 of only one battery cell 10 in the first direction Z, or may overlap with the pressure relief mechanisms 13 of multiple battery cells 10 in the first direction Z at the same time.

[0122] The substances released by the battery cell 10 during thermal runaway act on the protective layer 30. This layer reduces the thermal shock to the first wall 21 and the amount of heat transferred to it, lowering the risk of melting through the first wall 21 and improving the reliability of the battery 2. The protective layer 30 only fills a portion of the recess 211, forming a relief space G. This relief space G reduces interference with the pressure relief mechanism 13, increasing the pressure relief rate and improving the reliability of the battery 2.

[0123] In some embodiments, the protective layer 30 comprises a high-temperature resistant material. Exemplarily, the protective layer 30 comprises at least one of mica, carbon fiber, and aerogel. The protective layer 30 exhibits good thermal shock resistance, thereby reducing the risk of the protective layer 30 being penetrated. Optionally, the melting point of the protective layer 30 is greater than that of the first box wall 21.

[0124] In some embodiments, the protective layer 30 includes an insulating material. For example, the protective layer 30 includes at least one of aluminum oxide and silicon nitride. The protective layer 30 can provide insulation, thereby reducing the risk of electrical conduction between the battery cell 10 and the housing 20.

[0125] In some embodiments, the protective layer 30 includes a buffering material. For example, the protective layer 30 includes at least one of foam and silicone rubber. The protective layer 30 can provide a buffering function. When the battery 2 is subjected to an external impact, the battery cells 10 may come into contact with the protective layer 30 due to vibration. The protective layer 30 can deform to provide a buffering effect, thereby reducing the risk of damage to the battery cells 10 and improving reliability.

[0126] In some embodiments, the protective layer 30 is accommodated in the recess 211, thereby improving space utilization. During assembly, the recess 211 can also play a positioning role.

[0127] One recess 211 can accommodate one protective layer 30 or multiple protective layers 30 at the same time.

[0128] In some embodiments, the protective layer 30 is connected to the first box wall 21 to reduce the risk of the protective layer 30 falling off when the battery 2 is subjected to external impact.

[0129] In some embodiments, in the first direction Z, the depth of the recess 211 is greater than the thickness of the protective layer 30 , thereby forming a relief space G.

[0130] In some embodiments, the protective layer 30 may be bonded to the first box wall 21. For example, the protective layer 30 is bonded to the bottom surface 211a of the recess.

[0131] In some embodiments, the battery 2 includes multiple battery cells 10. In the first direction Z, the protective layer 30 overlaps the pressure relief mechanisms 13 of at least two battery cells 10. This allows the protective layer 30 to withstand the high-temperature substances released by at least two battery cells 10, thereby reducing the number of protective layers 30 and simplifying assembly.

[0132] In some embodiments, the plurality of battery cells 10 are arranged in one or more columns.

[0133] In some embodiments, the battery 2 includes at least one battery column 10 a , and the battery column 10 a includes at least two battery cells 10 arranged along a second direction X. The first direction Z is perpendicular to the second direction X.

[0134] In the first direction Z, the protective layer 30 overlaps with the pressure relief mechanisms 13 of the battery cells 10 of the battery column 10 a. The protective layer 30 can separate the pressure relief mechanisms 13 of the battery cells 10 of a column from the first box wall 21 .

[0135] In some embodiments, in the first direction Z, the projections of all the pressure relief mechanisms 13 of a battery column 10 a are located within the projection of a protective layer 30 .

[0136] In some embodiments, the battery 2 includes a plurality of battery columns 10 a , and the plurality of battery columns 10 a are arranged along a third direction Y. Exemplarily, the third direction Y is perpendicular to the first direction Z and the second direction X.

[0137] In some embodiments, there are multiple protective layers 30 , and the multiple protective layers 30 are arranged along the third direction Y. Exemplarily, the number of protective layers 30 is the same as the number of battery columns 10 a , and the multiple protective layers 30 are arranged in a one-to-one correspondence with the multiple battery columns 10 a .

[0138] In some embodiments, the battery 2 includes a plurality of battery cells 10 . In the first direction Z, the recess 211 overlaps with the pressure relief mechanisms 13 of at least two battery cells 10 .

[0139] The recesses 211 can at least avoid the pressure relief mechanisms 13 of two battery cells 10 , thereby reducing the number of recesses 211 and lowering the difficulty of forming the first box wall 21 .

[0140] In some embodiments, the battery 2 includes at least one battery column 10 a , which includes at least two battery cells 10 arranged along a second direction X. The first direction Z is perpendicular to the second direction X. In the first direction Z, the projections of the pressure relief mechanisms 13 of the battery cells 10 in the battery column 10 a are all located within the projection of the recess 211 .

[0141] The recessed portion 211 can simultaneously avoid the pressure relief mechanisms 13 of a row of battery cells 10 arranged along the second direction X.

[0142] The recess 211 also increases the exhaust space within the housing 20, improving exhaust efficiency. In the event of thermal runaway of the battery cell 10, the material discharged from the battery cell 10 can enter the recess 211, which guides the material flow, thereby reducing material accumulation, lowering the risk of blockage of the pressure relief passage of the battery cell 10 and the risk of melting through the first housing wall 21. This improves exhaust efficiency, reduces the risk of seal failure, and enhances reliability.

[0143] For example, the recess 211 can guide particles discharged from the battery cells 10 , thereby reducing particles adhering to other normal battery cells 10 , reducing the risk of failure and ignition of other normal battery cells 10 , and slowing down heat spread.

[0144] In some embodiments, the battery 2 further includes an explosion-proof valve 40 disposed on the housing 20. When activated, the explosion-proof valve 40 can discharge the material in the recess 211 to the outside of the housing 20, thereby reducing the risk of fire or explosion of the battery 2.

[0145] In some embodiments, the plurality of recesses 211 are arranged along the third direction Y, and a protective layer 30 is disposed in each recess 211 .

[0146] In some embodiments, the recess 211 extends along the second direction X. For example, a cross section of the recess 211 perpendicular to the second direction X may be rectangular, trapezoidal, triangular, semicircular, semi-elliptical, or other shapes.

[0147] Exemplarily, there are multiple recesses 211 , and the cross-sections of the multiple recesses 211 may be the same or different.

[0148] In some embodiments, the first box wall 21 includes a wall body 212 and a protrusion 213. The protrusion 213 protrudes from the side of the wall body 212 away from the battery cell 10. The recess 211 is recessed relative to the surface of the wall body 212 facing the battery cell 10 and corresponds to the position of the protrusion 213.

[0149] The wall body 212 and the protrusion 213 may be integrally formed, or connected by bonding, welding or other methods.

[0150] One convex portion 213 may be provided corresponding to one concave portion 211 , or a plurality of concave portions 211 may be formed correspondingly.

[0151] The provision of the convex portion 213 reduces the depth restriction on the concave portion 211, thereby increasing the distance between the first tank wall 21 and the pressure relief mechanism 13 and improving the exhaust space. The concave and convex portions 211 and 213 form a concave-convex structure, which improves the structural strength of the first tank wall 21 and has a minimal effect on the weight of the first tank wall 21, thereby improving the reliability and energy density of the battery 2.

[0152] The concave-convex structure can improve the structural strength of the first box wall 21 and reduce abnormal noise generated by the battery 2 under vibration conditions.

[0153] In some embodiments, the wall body 212 and the protrusion 213 are integrally formed to reduce assembly processes and improve sealing performance.

[0154] For example, the first box wall 21 can be made by a stamping process.

[0155] In some alternative embodiments, the wall body 212 and the protrusion 213 are welded.

[0156] In some embodiments, the area of ​​the top surface 213a of the convex portion is S1, and the area of ​​the pressure relief mechanism 13 is S2.

[0157] Exemplarily, the top surface 213 a of the convex portion may be a plane perpendicular to the first direction Z. The area of ​​the pressure relief mechanism 13 may be the area of ​​a projection of the pressure relief mechanism 13 along the first direction Z.

[0158] In some embodiments, the battery column 10 a includes n battery cells 10 , where n is a positive integer greater than or equal to 2. 1≤S1 / (n×S2)≤5.

[0159] In this embodiment of the present application, S1 / (n×S2) is limited to less than or equal to 5 to reduce the weight increase of the battery 2 and the extent of the protruding area of ​​the first box wall 21, thereby facilitating the integration of the battery 2 with the vehicle. S1 / (n×S2) is limited to greater than or equal to 1 to enhance the ability of the recess 211 to collect and guide airflow, thereby reducing the impact of the high-temperature material formed by the battery cells 10 on other components.

[0160] In some embodiments, S1 / (n×S2) is 1, 2, 3, 4, or 5.

[0161] In some embodiments, the energy density of the battery cell 10 is E Wh / kg, and the wall thickness of the protrusion 213 is d mm. 0.0016≤E / d≤0.005.

[0162] For example, d may be the minimum distance between the top surface 213a of the convex portion and the bottom surface 211a of the concave portion along the first direction Z. For example, the battery cell 10 may be labeled with capacity and platform voltage, where E=(capacity×platform voltage) / battery cell weight.

[0163] In the embodiment of the present application, E / d is limited to 0.0016-0.005, which can balance the strength and weight of the first box wall 21, reduce the loss of energy density, and improve the overall structural strength of the battery 2.

[0164] In some embodiments, E / d is 0.0016, 0.002, 0.0025, 0.003, 0.0035, 0.004, 0.0045, or 0.005.

[0165] FIG6 is a schematic diagram of a first box wall and a protective layer of a battery provided in other embodiments of the present application.

[0166] 6 , in some embodiments, the battery 2 includes a plurality of battery cells 10 , and a plurality of protective layers 30 are provided, each corresponding to the pressure relief mechanisms 13 of the plurality of battery cells 10 .

[0167] In the embodiment of the present application, the protective layer 30 can be flexibly arranged according to the position of the pressure relief mechanism 13 , thereby reducing the overall usage of the protective layer 30 and improving the energy density of the battery cell 10 .

[0168] In some embodiments, one protective layer 30 may be provided corresponding to one recess 211 , or multiple protective layers 30 may be provided at the same time.

[0169] In some embodiments, a plurality of protective layers 30 are arranged in an array.

[0170] For example, the plurality of recesses 211 are arranged in a one-to-one correspondence with the plurality of battery columns 10 a , and at least two protection layers 30 arranged along the second direction X are disposed in each recess 211 .

[0171] FIG7 is a schematic diagram of a first box wall and a protective layer of a battery provided in some other embodiments of the present application.

[0172] As shown in FIG. 7 , in some embodiments, there are multiple recesses 211 and multiple battery cells 10 , and the pressure relief mechanisms 13 of the multiple battery cells 10 are disposed in a one-to-one correspondence with the multiple recesses 211 .

[0173] In some embodiments, a protective layer 30 is disposed in each recess 211 .

[0174] In some embodiments, the number of the concave portions 211 is the same as the number of the convex portions 213, and they are arranged in a one-to-one correspondence. For example, adjacent convex portions 213 are arranged at intervals.

[0175] In some embodiments, the area of ​​the top surface 213a of the convex portion is S1, and the area of ​​the pressure relief mechanism 13 is S2. 1≤S1 / S2≤5.

[0176] FIG8 is a schematic diagram of a first box wall and a protective layer of a battery provided in some further embodiments of the present application; FIG9 is an enlarged schematic diagram of the circle frame of FIG8 .

[0177] 8 and 9 , in some embodiments, the first wall 21 includes a plurality of recesses 211 spaced apart along the second direction X, with partitions 214 disposed between adjacent recesses 211. The partitions 214 can enhance the structural strength of the first wall 21.

[0178] In some embodiments, the partition 214 is provided with a channel 214a communicating with adjacent recesses 211. Exemplarily, the channel 214a includes a notch, a groove, a through hole or other structures.

[0179] When a battery cell 10 thermally runs away and releases high-temperature substances, the high-temperature substances can flow through the channels 214 a in the plurality of recesses 211 , thereby reducing the accumulation of the high-temperature substances.

[0180] FIG10 is a schematic partial cross-sectional view of batteries provided in some other embodiments of the present application.

[0181] As shown in FIG10 , in some embodiments, the first box wall 21 includes a wall body 212 and a cover plate 215. The wall body 212 has a through hole 2121. The cover plate 215 is connected to the wall body 212 and covers the through hole 2121. The cover plate 215 and the hole wall of the through hole 2121 define a recess 211.

[0182] The cover plate 215 may be located outside the wall body 212 , or may be at least partially accommodated in the through hole 2121 .

[0183] The cover plate 215 may be in a flat plate shape, a curved plate shape, or other shapes.

[0184] The embodiment of the present application can simplify the molding process of the first box wall 21 .

[0185] In some embodiments, the cover plate 215 is a flat plate.

[0186] In some embodiments, the battery 2 further includes a protective layer 30 , which is located on the inner side of the cover plate 215 . Exemplarily, the protective layer 30 is bonded to the cover plate 215 .

[0187] In some embodiments, at least a portion of the protective layer 30 is accommodated in the through hole 2121 , thereby improving space utilization.

[0188] In some embodiments, the through hole 2121 includes a first hole segment 2122 and a second hole segment 2123. The first hole segment 2122 is located on a side of the second hole segment 2123 away from the battery cell 10. The first hole segment 2122 has a bottom surface 2124 that surrounds the second hole segment 2123. The battery 2 also includes a protective layer 30, which is accommodated in the first hole segment 2122. In the axial direction of the through hole 2121, the bottom surface 2124 at least partially overlaps with the protective layer 30.

[0189] The shapes of the first hole section 2122 and the second hole section 2123 can be the same or different. For example, the first hole section 2122 and the second hole section 2123 are both round holes, or one of the first hole section 2122 and the second hole section 2123 is a round hole and the other is a square hole.

[0190] Exemplarily, the axial direction of the through hole 2121 is parallel to the first direction Z.

[0191] The bottom surface 2124 of the first hole section 2122 can limit the protective layer 30 to reduce the risk of the protective layer 30 falling onto the pressure relief mechanism 13.

[0192] FIG11 is a schematic partial cross-sectional view of a battery provided in some other embodiments of the present application.

[0193] As shown in Figure 11, in some embodiments, at least a portion of the cover plate 215 is accommodated in the through hole 2121. The through hole 2121 can provide space for the cover plate 215, thereby reducing the maximum size of the first box wall 21 in the first direction Z and improving space utilization.

[0194] In some embodiments, the cover plate 215 is entirely accommodated in the through hole 2121 to further increase space utilization.

[0195] In some embodiments, the protection layer 30 is sandwiched between the cover plate 215 and the bottom surface 2124 .

[0196] FIG12 is a schematic diagram of an explosion of a battery provided in some other embodiments of the present application.

[0197] In some embodiments, the second housing portion 20b has a first cavity 22 and a second cavity 23 spaced apart from each other. The battery cell 10 is accommodated in the first cavity 22, and the recess 211 connects the first cavity 22 with the second cavity 23. In the event of thermal runaway of a battery cell 10, the recess 211 can direct high-temperature material into the second cavity 23, thereby reducing the impact of the high-temperature material on other battery cells 10 and slowing down the spread of heat.

[0198] In some embodiments, the explosion-proof valve 40 is disposed on the outer wall of the second housing portion 20b that encloses the second cavity 23. When the battery cell 10 experiences thermal runaway, the explosion-proof valve 40 can discharge the material in the second cavity 23, thereby reducing the risk of battery 2 explosion and improving the reliability of battery 2.

[0199] According to some embodiments of the present application, the present application further provides an electrical device, comprising the battery 2 of any of the above embodiments, the battery 2 being used to provide power to the electrical device. The electrical device may be any of the aforementioned devices or systems using the battery 2.

[0200] 2 to 5 , an embodiment of the present application provides a battery 2 , which includes a housing 20 , a plurality of battery cells 10 , and a plurality of protective layers 30 .

[0201] A pressure relief mechanism 13 is provided on one side of the battery cell 10 along the first direction Z. The box body 20 includes a first box wall 21 , and the pressure relief mechanism 13 faces the first box wall 21 along the first direction Z.

[0202] The battery 2 includes a plurality of battery cells 10 arranged in an array. Specifically, the battery 2 includes a plurality of battery columns 10 a, each battery column 10 a including at least two battery cells 10 arranged along a second direction X. The plurality of battery columns 10 a are arranged along a third direction Y, and the first direction Z, the second direction X, and the third direction Y are perpendicular to each other.

[0203] A plurality of recesses 211 are formed on a side of the first box wall 21 facing the pressure relief mechanism 13 . Each recess 211 extends along the second direction X. The recesses 211 are spaced apart along the third direction Y. The number of recesses 211 is the same as the number of battery arrays 10 a .

[0204] The plurality of recesses 211 are disposed in a one-to-one correspondence with the plurality of battery columns 10 a . Specifically, in the first direction Z, the projections of the pressure relief mechanisms 13 of all the battery cells 10 in one battery column 10 a are located within the projection of a corresponding recess 211 .

[0205] Each recess 211 accommodates a protective layer 30 . In the first direction Z, the projections of the pressure relief mechanisms 13 of all battery cells 10 in a battery array 10 a lie within the projection of a corresponding protective layer 30 . The recess 211 includes an escape space G between the protective layer 30 and the pressure relief mechanism 13 in the first direction Z.

[0206] The first box wall 21 includes a wall body 212 and a plurality of protrusions 213. Each protrusion 213 protrudes from the side of the wall body 212 away from the battery cell 10. The recesses 211 are recessed relative to the surface of the wall body 212 facing the battery cell 10. The plurality of recesses 211 and the plurality of protrusions 213 are arranged in a one-to-one correspondence.

[0207] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and components may be replaced with equivalents without departing from the scope of the present application. In particular, the various technical features described in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions within the scope of the claims.

Claims

1. A battery comprising: A battery cell, wherein a pressure relief mechanism is provided on one side of the battery cell along a first direction; A box body, wherein the battery cell is accommodated in the box body, the box body includes a first box wall, the pressure relief mechanism faces the first box wall along the first direction, and a recess is provided on the side of the first box wall facing the pressure relief mechanism, and in the first direction, the recess and the pressure relief mechanism at least partially overlap.

2. The battery according to claim 1, wherein The pressure relief mechanism includes a pressure relief area, and the pressure relief area includes a main body and a weak portion arranged around the main body; In the first direction, a projection of the pressure relief area is located within a projection of the recess.

3. The battery according to claim 1 or 2, further comprising a protective layer, at least a portion of which is accommodated in the recess; In the first direction, the protective layer and the pressure relief mechanism at least partially overlap; the recess includes an escape space between the protective layer and the pressure relief mechanism in the first direction.

4. The battery according to claim 3, wherein The protective layer is accommodated in the recess and connected to the first box wall; In the first direction, the depth of the recess is greater than the thickness of the protective layer.

5. The battery according to claim 3 or 4, comprising a plurality of said battery cells; In the first direction, the protective layer overlaps with the pressure relief mechanisms of at least two of the battery cells.

6. The battery according to claim 3 or 4, comprising a plurality of battery cells; the protective layers are multiple, and the multiple protective layers are arranged in a one-to-one correspondence with the pressure relief mechanisms of the multiple battery cells. 7 . The battery according to claim 1 , comprising a plurality of battery cells; in the first direction, the recess overlaps with the pressure relief mechanisms of at least two of the battery cells.

8. The battery according to claim 7, comprising at least one battery column, wherein the battery column comprises at least two battery cells arranged along a second direction, the first direction being perpendicular to the second direction; In the first direction, projections of the pressure relief mechanisms of the battery cells in the battery column are all located within the projection of the recess.

9. The battery according to any one of claims 1, 2, 3, 4 and 6, wherein There are a plurality of recesses and a plurality of battery cells, and the pressure relief mechanisms of the plurality of battery cells are arranged in a one-to-one correspondence with the plurality of recesses.

10. The battery according to any one of claims 1 to 9, wherein The first box wall includes a plurality of recesses spaced apart along a second direction, with partitions provided between adjacent recesses. The second direction is perpendicular to the first direction; the partitions are provided with channels communicating with adjacent recesses.

11. The battery according to any one of claims 1 to 10, wherein: The first box wall includes a wall body and a convex portion. The convex portion protrudes from a side of the wall body away from the battery cell. The concave portion is recessed relative to a surface of the wall body facing the battery cell and corresponds to the position of the convex portion.

12. The battery according to claim 11, wherein The wall body and the convex portion are integrally formed.

13. The battery according to any one of claims 1 to 10, wherein: The first box wall includes a wall body and a cover plate, the wall body has a through hole, and the cover plate is connected to the wall body and covers the through hole; The cover plate and the hole wall of the through hole define the recess.

14. The battery according to claim 13, wherein At least a portion of the cover plate is received in the through hole.

15. The battery according to claim 13 or 14, wherein The through hole includes a first hole segment and a second hole segment, the first hole segment is located on a side of the second hole segment away from the battery cell, and the first hole segment has a bottom surface surrounding the second hole segment; The battery further includes a protective layer, which is accommodated in the first hole segment. In the axial direction of the through hole, the bottom surface at least partially overlaps with the protective layer.

16. An electrical device comprising the battery according to any one of claims 1 to 15, wherein the battery is used to provide electrical energy.

Images