Batteries and electrical equipment.

Abstract

Invention details;

Description

Batteries and electrical devices Technical Field

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

[0002] In recent years, the emergence of new energy vehicles has played a huge role in promoting social development and environmental protection. Power batteries, as a rechargeable battery, are the power source of new energy vehicles and are widely used in the field of new energy vehicles.

[0003] In the existing technology, the energy density of the battery is not high, resulting in space waste, which in turn affects the performance of the electrical device; moreover, the existing battery has poor rigidity and cannot directly withstand the load brought by other parts of the electrical device, which is prone to safety accidents and affects the safety of the electrical device.

[0004] Summary of the Invention

[0005] The embodiments of the present application provide a battery and an electrical device that can improve the energy density and safety of the battery.

[0006] In a first aspect, embodiments of the present application provide a battery comprising a housing, battery cells, and a stabilizing assembly. The housing has a top and a bottom facing each other along its height; a plurality of battery cells are inverted within the housing, with the top covers of the battery cells facing the bottom of the housing; and the stabilizing assembly is fixedly connected to the battery cells.

[0007] In the above technical solution, the box has a relative top and bottom in the height direction. By setting the top cover plate of the battery cell toward the bottom of the box, the energy density of the battery can be improved, and by setting a stable component fixedly connected to the battery cell, the stability of the battery structure can be improved.

[0008] In some embodiments, the stabilizing assembly includes a first support plate and a second support plate. The first support plate is arranged at the top of the box and fixedly connected to the battery cell. The second support plate is arranged at the bottom of the box and fixedly connected to the battery cell to fix the position of the battery cell.

[0009] In some embodiments, a surface of the second support plate facing the battery cells is provided with suspension beams, and a plurality of suspension beams are spaced apart along the second support plate in the length direction of the box body and extend on the second support plate in the width direction of the box body.

[0010] In the above technical solution, the top cover of the battery is prevented from directly abutting against the second support plate, thereby affecting the performance of the battery.

[0011] In some embodiments, the top cover plate includes a functional area and shoulders, the functional area is provided with electrode terminals, the shoulders are located on both sides of the functional area along the length direction, and the battery cell is fixed to the suspension beam through the shoulders.

[0012] In the above technical solution, the functional area is arranged between the shoulders, which can provide a certain degree of protection for the functional area. The battery cells are connected to the suspension beam via the shoulders, which can prevent the functional area from being damaged due to stress and extend the life of the battery cells.

[0013] In some embodiments, the electrode terminal is disposed between two adjacent suspension beams, and the electrode terminal is spaced apart from the second support plate.

[0014] In the above technical solution, the electrode terminal is prevented from contacting the second support plate, which facilitates electrical connection of the electrode terminal to the outside world.

[0015] In some embodiments, in a height direction, an extension height of the suspension beam is greater than an extension height of the electrode terminal.

[0016] In the above technical solution, the electrode terminals are suspended between the suspension beams.

[0017] In some embodiments, the functional area is further provided with a pressure relief mechanism, which is spaced apart from the second support plate. In the length direction, the electrode terminals are provided on both sides of the pressure relief mechanism.

[0018] In the above technical solution, the pressure relief mechanism and the second support plate are spaced apart, which can provide a larger pressure relief space for the pressure relief mechanism, reduce the risk caused by the discharge of emissions, and improve the safety of the battery.

[0019] In some embodiments, the shoulders of two adjacent battery cells are fixed to the same suspension beam.

[0020] In the above technical solution, adjacent battery cells share the same suspension beam, which can reduce the number of suspension beams as much as possible and facilitate the manufacture of the second support plate.

[0021] In some embodiments, in the length direction, the width D1 of the suspension beam and the extended width D2 of the shoulder satisfy: 0.5D2≤D1≤2D2.

[0022] In the above technical solution, the suspension beam is prevented from only being able to carry the battery cells on one side due to bias, and the suspension beam is made to contact only the shoulders of two adjacent battery cells, while avoiding contact with the functional area to affect the function of the battery cells.

[0023] In some embodiments, two adjacent battery cells are electrically connected via a busbar component. In the width direction, an extension length of one of the two adjacent suspension beams is smaller than an extension length of the other to form an avoidance gap for avoiding the busbar component.

[0024] In the above technical solution, the suspension beam is better adapted to the structure of the battery, making it easier for the battery cells to be connected in series, in parallel, and in mixed connection.

[0025] In some embodiments, the suspension beam is integrally formed with the second support plate or is detachably connected to facilitate manufacturing or adjust the position of the suspension beam according to the arrangement of the battery cells.

[0026] In some embodiments, in the height direction, the extension height of the suspension beam is a first dimension H1 , and the first dimension H1 satisfies 0.5 mm ≤ H1 ≤ 30 mm to keep the battery volume moderate.

[0027] In some embodiments, a ratio H1 / M of the first dimension H1 to the weight M of a single battery cell satisfies 0.05 mm / Kg≤H1 / M≤50 mm / Kg.

[0028] In the above technical solution, the battery has good energy density and suitable structural strength.

[0029] In some embodiments, the box body further includes a cover body disposed at the bottom, and the cover body is fixedly connected to the box body.

[0030] In some embodiments, the second support plate is fixedly connected to the cover to increase the structural firmness of the battery.

[0031] In a second aspect, an embodiment of the present application provides an electrical device, comprising a battery cell according to any embodiment of the first aspect, wherein the battery cell is used to provide electrical energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments of the present application. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the drawings without creative work.

[0033] FIG1 is a schematic structural diagram of a vehicle provided in some embodiments of the present application;

[0034] FIG2 is a schematic diagram of the assembly structure of batteries according to some embodiments of the present application;

[0035] FIG3 is a schematic diagram of an explosion of a battery according to some embodiments of the present application;

[0036] FIG4 is a schematic structural diagram of a second support plate and a suspension beam of a battery in some embodiments of the present application;

[0037] FIG5 is a schematic structural diagram of a battery cell according to some embodiments of the present application;

[0038] FIG6 is a schematic cross-sectional view of the battery shown in FIG2 ;

[0039] FIG7 is an enlarged schematic diagram of FIG6 at the circle B;

[0040] FIG8 is a schematic structural diagram of a collision test device for performing a collision test on a battery according to some embodiments of the present application;

[0041] FIG9 is a schematic structural diagram of a battery cover according to some embodiments of the present application;

[0042] FIG10 is a schematic diagram of the internal structure of a battery cell according to some embodiments of the present application.

[0043] The reference numerals of the specific embodiments are as follows:

[0044] 1000, vehicle; 100, battery; 200, controller; 300, motor; 1, housing; 101, top; 102, bottom; 103, opening; 11, side panel; 2, battery cell; 201, functional area; 202, shoulder; 21, top cover; 211, electrode terminal; 212, pressure relief mechanism; 22, housing; 23, electrode assembly; 24, current collector; 3, stabilizing assembly; 31, first support plate; 32, second support plate; 321, suspension beam; 322, avoidance notch; 4, cover; 41, main body; 42, mating portion;

[0045] X, length direction; Y, width direction; Z, height direction. DETAILED DESCRIPTION

[0046] 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.

[0047] 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.

[0048] 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.

[0049] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connected," and "attached" should be understood in a broad sense. 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.

[0050] 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.

[0051] 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.

[0052] The term "plurality" used in this application refers to two or more (including two).

[0053] In this application, the term "parallel" includes not only the absolutely parallel situation, but also the roughly parallel situation conventionally recognized in engineering; at the same time, "vertical" also includes not only the absolutely vertical situation, but also the roughly vertical situation conventionally recognized in engineering.

[0054] In the present application, battery cells may include lithium-ion secondary battery cells, lithium-ion primary battery cells, lithium-sulfur battery cells, sodium-lithium-ion battery cells, sodium-ion battery cells or magnesium-ion battery cells, etc., and the embodiments of the present application are not limited to this.

[0055] In the present application, a battery refers to a single physical module that includes one or more battery cells to provide higher voltage and capacity. For example, the battery mentioned in the present application may be a battery module or a battery pack, etc. A battery generally includes a casing for encapsulating one or more battery cells. The casing can prevent liquids or other foreign matter from affecting the charging or discharging of the battery cells. In a battery, multiple battery cells can be connected in series, in parallel, or in mixed connection. Mixed connection means that multiple battery cells are connected in series and in parallel. Multiple battery cells can be directly connected in series, in parallel, or in mixed connection, and then the whole formed by the multiple battery cells is accommodated in the casing; of course, the battery can also be a battery in which multiple battery cells are first connected in series, in parallel, or in mixed connection to form a battery, and then the multiple batteries are connected in series, in parallel, or in mixed connection to form a whole, and then accommodated in the casing.

[0056] Currently, market developments indicate that power batteries are becoming increasingly widely used. They are not only used in energy storage systems such as hydropower, thermal, wind, and solar power plants, but are also widely used in electric vehicles like electric bicycles, electric motorcycles, and electric vehicles, as well as in military equipment and aerospace. As power battery applications continue to expand, market demand is also growing.

[0057] In the related art, the opening of the battery box is usually oriented upward in the vertical direction, the battery cells are fixed to the bottom of the battery, and the electrode terminals face the cover covering the box opening.

[0058] However, in the battery arranged as described above, the inventors noticed that, since the bottom of the battery is bonded to the electrical device when it is arranged in the electrical device, and the battery cells are fixed to the bottom of the battery, the rigidity of the top of the battery, which is more susceptible to collisions, is poor. In addition, during a collision, the internal battery cells are subjected to uneven force, which makes the battery prone to damage, resulting in poor battery safety and affecting the battery's performance.

[0059] In view of this, an embodiment of the present application provides a battery, so that the box has a relative top and bottom in the height direction. By setting the top cover plate of the battery cell toward the bottom of the box, the energy density of the battery can be improved, and by setting a stabilizing component fixedly connected to the battery cell, the stability of the battery structure can be improved.

[0060] The technical solutions described in the embodiments of the present application are applicable to batteries and electrical devices powered by batteries.

[0061] Electrical devices may include vehicles, mobile phones, portable devices, laptop computers, ships, spacecraft, electric toys, and electric tools, etc. Vehicles may include fuel vehicles, gas vehicles, or new energy vehicles. New energy vehicles may include pure electric vehicles, hybrid vehicles, or extended-range vehicles, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools, and railway electric tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. The embodiments of the present application do not impose any special restrictions on the above-mentioned electrical devices.

[0062] It should be understood that the technical solutions described in the embodiments of the present application are not limited to being applicable to the electrical devices described above, but for the sake of simplicity, the following embodiments are all described using vehicle 1000 as an example.

[0063] Figure 1 is a schematic diagram of the structure of a vehicle 1000 provided in some embodiments of the present application. As shown in Figure 1 , vehicle 1000 can be a fuel-powered vehicle, a gas-powered vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle. Vehicle 1000 is internally provided with a battery 100, which can be located at the bottom, front, or rear of vehicle 1000.

[0064] The battery 100 can be used to power the vehicle 1000. For example, the battery 100 can serve as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery 100 to power the motor 300, for example, to meet the power requirements of the vehicle 1000 during startup, navigation, and driving. In some embodiments of the present application, the battery 100 can serve not only as an operating power source for the vehicle 1000, but also as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0065] FIG2 is a schematic diagram of the assembly structure of the battery 100 in some embodiments of the present application. FIG3 is a schematic diagram of the explosion of the battery 100 in some embodiments of the present application. As shown in FIG2 and FIG3, in the embodiment of the present application, the battery 100 includes a housing 1, a battery cell 2, and a stabilizing assembly 3. The housing 1 has a top 101 and a bottom 102 relative to each other along the height direction of the housing 1. A plurality of battery cells 2 are inverted in the housing 1, and the top cover plates 21 of the battery cells 2 are arranged toward the bottom 102 of the housing 1. The stabilizing assembly 3 is fixedly connected to the battery cell 2.

[0066] The housing 1 has a top 101 and a bottom 102 relative to each other along its height. This indicates that the top 101 and bottom 102 of the housing 1 are arranged sequentially along the height direction from top to bottom. For ease of description, in this embodiment of the present application, the height direction of the housing 1 is referred to as the Z direction, i.e., the vertical direction. It should be understood that the Z direction of the height of the housing 1 can also be along other directions. These other directions will be further defined in the following text to indicate other factors, such as the arrangement direction of the battery cells 2. This description is not provided here.

[0067] Multiple battery cells 2 are placed upside down within the housing 1, with the top covers 21 of the battery cells 2 facing the top 101 of the housing 1. This indicates that the battery cells 2 are inverted relative to the housing 1 in the height direction Z, with the bottoms 102 of the battery cells 2 located at the top 101 of the housing 1. By placing the battery cells 2 upside down relative to the housing 1, the rigidity of the top 101 of the battery 100 is increased, thereby enhancing the safety of the battery 100. Furthermore, with the top covers 21 of the battery cells 2 facing the bottom 102 of the battery 100, the energy density of the battery 100 is increased, improving its usability.

[0068] The stabilizing assembly 3 is fixedly connected to the battery cell 2 , that is, the stabilizing assembly 3 is fixedly connected to the bottom 102 of the battery cell 2 and both ends of the top cover plate 21 , thereby supporting the battery cell 2 and increasing the structural strength of the battery 100 .

[0069] In some embodiments of the present application, the stabilizing assembly 3 includes a first support plate 31 and a second support plate 32. The first support plate 31 is arranged at the top 101 of the box body 1 and is fixedly connected to the battery cell 2. The second support plate 32 is arranged at the bottom 102 of the box body 1 and is fixedly connected to the battery cell 2.

[0070] The first support plate 31 and the second support plate 32 are respectively disposed on the top 101 and the bottom 102 of the box body 1 and are fixedly connected to the battery cells 2 to fix the position of the battery cells 2 and enhance the structural stability of the battery 100 .

[0071] Optionally, the first support plate 31 can be located at the top 101 of the box body 1 as a part of the box body 1, or it can be an independent plate arranged between the box body 1 and the battery cell 2, with one side fixedly connected to the box body 1 and the other side fixedly connected to the battery cell 2. This embodiment of the present application does not limit this.

[0072] Optionally, the battery cell 2 may be directly bonded to the first support plate 31 and the second support plate 32 by adhesive, or may be fixedly connected to the first support plate 31 and the second support plate 32 by other means.

[0073] Figure 4 is a schematic diagram of the structure of the second support plate 32 and suspension beams 321 of the battery 100 in some embodiments of the present application. As shown in Figure 4, in some embodiments of the present application, the surface of the second support plate 32 facing the battery cell 2 is provided with suspension beams 321. Multiple suspension beams 321 are spaced apart along the second support plate 32 in the longitudinal direction of the box body 1 and extend on the second support plate 32 in the width direction of the box body 1.

[0074] For ease of description, in the embodiment of this application, the length direction of the box 1 is the X direction, and the width direction is the Y direction. The length direction X and the width direction Y are each perpendicular to the height direction Z. It should be understood that when the angles between the length direction X, the height direction Z, and the width direction Y are 85°-95°, they can be considered perpendicular to each other. The length direction X and the width direction Y can also be other directions, and both do not need to be perpendicular to the height direction Z. This application does not elaborate on this.

[0075] The suspension beams 321 protrude from the second support plate 32 along the height direction Z toward the battery cells 2, thereby supporting and carrying the battery cells 2. Multiple suspension beams 321 are spaced apart on the second support plate 32 along the length direction X. In other words, the suspension beams 321 are arranged along the length direction X to support the battery cells 2 at multiple locations. Because multiple battery cells 2 are disposed within the housing 1 and arranged in an array, the suspension beams 321 extend along the width direction Y, allowing a single suspension beam 321 to support multiple battery cells 2 along the width direction Y.

[0076] The suspension beam 321 is provided on the second support plate 32 to improve the structural stability of the battery 100 and prevent the top cover of the battery 100 from directly abutting against the second support plate 32 and affecting the performance of the battery 100 .

[0077] Figure 5 is a schematic diagram of the structure of a battery cell 2 according to an embodiment of the present application. As shown in Figure 5, in some embodiments of the present application, the top cover plate 21 includes a functional area 201 and a shoulder portion 202. The functional area 201 is provided with electrode terminals 211. The shoulders 202 are located on both sides of the functional area 201 along the length direction X. The battery cell 2 is fixed to the suspension beam 321 via the shoulder portion 202.

[0078] Functional area 201 indicates the area on the top cover plate 21 where the battery cells 2 are located, enabling them to function or interact with the outside world. This includes, for example, electrode terminals 211, which allow the battery cells 2 to electrically connect to the outside world. Because functional area 201 often contains components such as electrode terminals 211, it is not recommended that these areas be subjected to stress during use of the battery 100. Shoulder 202 indicates the area of ​​the top cover plate 21 outside of the functional area 201 that can be subjected to stress.

[0079] The functional area 201 with the electrode terminals 211 is arranged between the shoulders 202, so that the shoulders 202 can provide a certain degree of protection for the functional area 201. The battery cell 2 is connected to the suspension beam 321 via the shoulders 202, which can prevent the electrode terminals 211 in the functional area 201 from being damaged due to stress, thereby extending the life of the battery cell 2.

[0080] Optionally, the battery cell 2 may be directly bonded to the suspension beam 321 by adhesive, or may be fixedly connected to the suspension beam 321 by other means, which is not limited in the embodiment of the present application.

[0081] In some embodiments of the present application, the electrode terminal 211 is disposed between two adjacent suspension beams 321 , and the electrode terminal 211 is spaced apart from the second support plate 32 .

[0082] Since the functional area 201 is located between the two shoulders 202, the shoulders 202 are overlapped on the suspension beam 321, and the electrode terminal 211 of the functional area 201 is also located between the two adjacent suspension beams 321. The electrode terminal 211 is spaced apart from the second support plate 32, that is, the electrode terminal 311 does not contact the second support plate 32. The electrode terminal 211 can be regarded as being suspended between the two suspension beams 321, so as to facilitate the extraction of electrical energy from the battery cell 2 through the electrode terminal 211, thereby improving the availability of the battery cell 2.

[0083] In some embodiments of the present application, in the height direction Z, the extension height of the suspension beam 321 is greater than the extension heights of the electrode terminal 211 and the pressure relief mechanism 212 .

[0084] In the height direction Z, the extension height of the suspension beam 321 is greater than the extension height of the electrode terminal 211 , so that the electrode terminal 211 and the pressure relief mechanism 212 can be suspended between adjacent suspension beams 321 to avoid contact with other components and affect their functions.

[0085] In some embodiments of the present application, the functional area 201 is further provided with a pressure relief mechanism 212 . The pressure relief mechanism 212 is spaced apart from the second support plate 32 . In the length direction X, the electrode terminals 211 are provided on both sides of the pressure relief mechanism 212 .

[0086] The pressure relief mechanism 212 is an element or component that is activated to release the internal pressure of the battery cell 2 when the internal pressure reaches a predetermined threshold. Specifically, when the internal pressure of the battery cell 2 reaches the predetermined threshold, the pressure relief mechanism 212 activates or is activated to a certain state, thereby releasing the internal pressure of the battery cell 2. The action of the pressure relief mechanism 212 may include, but is not limited to, rupturing, breaking, tearing, or opening at least a portion of the pressure relief mechanism 212, thereby forming an opening 103 or channel for releasing the internal pressure. At this point, the high-temperature, high-pressure substances within the battery cell 2 are discharged from the activated portion as exhaust. This method allows the pressure of the battery cell 2 to be released under controllable pressure, thereby avoiding potentially more serious accidents. The pressure relief mechanism 212 may take the form of an explosion-proof valve, an air valve, a pressure relief valve, or a safety valve, and may specifically employ a pressure-sensitive element or structure.

[0087] Placing the electrode terminals 211 on either side of the pressure relief mechanism 212 can reduce the impact of the pressure relief structure 212 on the electrode terminals 211 during pressure relief. Furthermore, the pressure relief mechanism 212 is spaced apart from the second support plate 32, meaning that the pressure relief mechanism 212 does not contact the second support plate 32. This provides the pressure relief mechanism 212 with more space for pressure relief, reduces the risk of emissions, and improves the safety of the battery 100.

[0088] In some embodiments of the present application, the shoulders 202 of two adjacent battery cells 2 are fixed to the same suspension beam 321 .

[0089] When multiple battery cells 2 are arranged in the box body 1, the multiple battery cells 2 are arranged adjacent to each other in the box body 1. Since the suspension beam 321 is arranged at intervals along the second support plate 32 along the length direction X, the shoulders 202 are located on both sides of the functional area 201 in the length direction X, so that the shoulders 202 can be located at the junction of adjacent battery cells 2, so that the shoulders 202 of two adjacent battery cells 2 are fixed together on the same suspension beam 321.

[0090] The battery cells 2 adjacent to each other in the length direction X share the same suspension beam 321 , which can reduce the number of suspension beams 321 as much as possible and facilitate the manufacture of the second support plate 32 .

[0091] In some embodiments of the present application, in the length direction X, the width D1 of the suspension beam 321 and the extended width D2 of the shoulder 202 satisfy: 0.5D2≤D1≤2D2.

[0092] When the width D1 of the suspension beam 321 is greater than or equal to 0.5 times the extended width D2 of the shoulder portion 202, sufficient support is provided for the battery cell 2. Furthermore, when the suspension beam 321 simultaneously supports two adjacent battery cells 2, the width of the suspension beam 321 in the length direction X is less than or equal to twice the extended width of the shoulder portion 202. This ensures that the suspension beam 321 only contacts the shoulders 202 of the two adjacent battery cells 2, avoiding contact with the functional area 201 and potentially affecting the function of the battery cells 2.

[0093] Preferably, the relationship between the width D1 of the suspension beam 321 and the extended width D2 of the shoulder 202 satisfies D2 ≤ D1 ≤ 2D2. Because the suspension beam 321 may be offset between adjacent battery cells 2, ensuring that the width of the suspension beam 321 in the length direction X is greater than or equal to the extended width of the shoulder 202 allows the suspension beam 321 to simultaneously support two adjacent battery cells 2, rather than causing the battery 100 to suffer structural instability due to uneven force and only supporting one side due to offset.

[0094] Referring to Figure 4 again, as shown in Figure 4, in some embodiments of the present application, two adjacent battery cells 2 are electrically connected through a busbar component 24, and in the width direction Y, the extension length of one of the two adjacent suspension beams 321 is smaller than the extension length of the other to form an avoidance gap 322, which is used to avoid the busbar component 24.

[0095] The busbar assembly 24 is a component that enables electrical connection between multiple battery cells 2. The busbar assembly 24 spans between the electrode terminals 211 of adjacent battery cells 2 to connect the multiple battery cells 2 in series, parallel, or mixed. In this embodiment of the present application, the busbar assembly 24 spans between the electrode terminals 211 of adjacent battery cells 2 in the length direction X. Therefore, at least a portion of the suspension beam 321 extending in the width direction Y needs to be cleared to form a clearance gap 322.

[0096] The extension length of one of the two adjacent suspension beams 321 is smaller than the extension length of the other, that is, the suspension beams 321 with longer extension lengths and the suspension beams 321 with shorter extension lengths are alternately distributed. Optionally, the length of the suspension beams 321 can also be adjusted according to the arrangement of the conduit component 24. Moreover, the extension length of the suspension beams 321 in the width direction Y only indicates the total length of the suspension beams 321 in the width direction Y. In other words, the avoidance gap 322 can be set at one end of the suspension beam 321 or in the middle of the suspension beam 321, depending on the arrangement of the conduit component 24. This embodiment of the present application does not impose any special restrictions on this.

[0097] Providing the avoidance notch 322 on the suspension beam 321 can make the suspension beam 321 better adapted to the structure of the battery 100 , and facilitate the battery cells 2 to be connected in series, in parallel, and in mixed connection.

[0098] In some embodiments of the present application, the suspension beam 321 and the second support plate 32 may be integrally formed or detachably connected.

[0099] When the suspension beam 321 and the second support plate 32 are integrally formed, the second support plate 32 can be easily manufactured. When the suspension beam 321 and the second support plate 32 are detachably connected to each other, the position of the suspension beam 321 can be easily adjusted according to the arrangement of the battery cells 2, making the battery 100 have a more stable structure.

[0100] In some optional embodiments, the surfaces of the second support plate 32 and the suspension beam 321 are covered with insulating material.

[0101] To avoid affecting the electrical connection between the battery cells 2, the second support plate 32 and the suspension beam 321 are insulating components. It is understood that the second support plate 32 and the suspension beam 321 can be entirely made of an insulating material, or their surfaces can be coated with an insulating material to provide overall insulation. When the second support plate 32 and the suspension beam 321 are coated with an insulating material, the core material can be metal, an insulating material, or a composite material, and the outer surface of the core material can be coated with an insulating material.

[0102] Figure 6 is a schematic cross-sectional view of the battery 100 shown in Figure 2. Figure 7 is an enlarged schematic view of Figure 6 at circle B. As shown in Figures 6 and 7, in some embodiments of the present application, in the height direction Z, the extension height of the suspension beam 321 is a first dimension H1, and the first dimension H1 satisfies 0.5 mm ≤ H1 ≤ 30 mm.

[0103] The suspension beam 321 has a certain dimension in the height direction Z, allowing it to protrude from the second support plate 32 to support the battery cell 2. The suspension beam 321 maintains a first dimension H1, which allows the top cover plate 21 of the battery cell 2 to maintain a certain distance from the bottom 102 of the box body 1, thereby maintaining a moderate energy density of the battery 100.

[0104] In some embodiments of the present application, a ratio H1 / M of the first size H1 to the weight M of a single battery cell 2 satisfies 0.05 mm / Kg≤H1 / M≤50 mm / Kg.

[0105] The ratio H1 / M of the first dimension H1 to the weight M of a single battery cell 2 can indicate the energy density and structural strength of the battery 100. When the ratio H1 is too large, the energy density of the battery 100 is too low. When the ratio H1 is too small, the structural strength of the battery 100 is insufficient, potentially leading to a safety accident in a collision. Therefore, the ratio H1 / M of the first distance H1 to the weight M of a single battery cell 2 satisfies 0.05 mm / kg ≤ H1 / M ≤ 50 mm / kg. Within this range, the battery 100 has good energy density and suitable structural strength.

[0106] To verify that the battery 100 has good performance when the ratio H1 / M of the first dimension H1 to the weight M of a single battery cell 2 is within an appropriate range, a structural strength test can be performed on the battery 100. During the structural strength test of the battery 100, the structural strength of the battery 100 can be determined, for example, through multiple tests such as a shear strength test and a compressive strength test.

[0107] In a shear strength test, for example, the battery 100 can be secured between the clamps of a shear tester. The test head of the shear tester then moves the battery 100 at a speed of 5 mm / min along the width direction X or length direction Y. When the box 1 is damaged, the tensile force F applied by the test head is recorded. The projected area of ​​the battery 100 in the height direction Z is defined as area A. The value of F / A is the shear strength that the battery 100 can withstand.

[0108] In the compressive strength test, for example, an extrusion head can be used to apply pressure to the battery 100 in the height direction Z and the width direction X or the length direction Y, and advance toward the battery 100 at a speed of 2 m / s. The pressure is stopped when the extrusion force reaches 50 KN or the deformation of the battery 100 reaches 30%, and the pressure is maintained for 10 minutes. After the compressive strength test, the battery 100 is left to stand at ambient temperature for 2 hours for observation.

[0109] Optionally, the structural strength of the battery 100 may be tested by other structural strength tests, which are not limited in the embodiments of the present application.

[0110] Table 1 shows the test results of the structural strength of the battery 100 using the above method when the first distance H1, the weight M of a single battery cell 2, and the value of H1 / M are different.

[0111] Table 1

[0112] H1 (mm) M (Kg) H1 / M (mm / Kg) Structural strength test Example 1 0.5 10 0.05 Good Example 2 5 5 1 Good Example 3 10 4 2.5 Good Example 4 10 25 Good Example 5 20 120 Excellent Example 6 30 0.650 Good Comparative Example 1 0.2 5 0.04 Poor Comparative Example 2 5 2 1 5 2 Poor

[0113] As shown in Table 1, when H1 satisfies 0.5 mm ≤ H1 ≤ 30 mm and H1 / M satisfies 0.05 mm / Kg ≤ H1 / M ≤ 50 mm / Kg, the battery 100 has good structural strength in the strength structure test.

[0114] In some other optional embodiments, the battery cells 2 may not be fixedly connected to the suspension beams 321 of the second support plate 32 , but may only be mounted on the suspension beams 321 .

[0115] At this time, the first dimension H1 satisfies 5mm≤H1≤30mm, and the ratio H1 / M of the first dimension H1 to the weight M of a single battery cell 2 satisfies 0.5mm / Kg≤H1 / M≤50mm / Kg. Preferably, H1 / M satisfies 1mm / Kg≤H1 / M≤30mm / Kg. Within this value range, the battery 100 has good energy density and suitable structural strength.

[0116] Figure 8 is a schematic structural diagram of a collision test device A for performing a collision test on a battery 100 in some embodiments of the present application. In order to verify that the battery 100 has good performance when the ratio H1 / M of the first distance H1 to the weight M of a single battery cell 2 is within an appropriate range, the battery 100 is subjected to a collision test using a collision test device A, for example. As shown in Figure 8, the collision test device A includes an impact head A1, a launch device A2, and a rack A3. During the test, the battery 100 is placed on the rack A3 so that the impact head A1 is driven by the launch device A2 to collide with the battery 100 at a certain speed. Among them, the test conditions can be selected as: the collision direction is the height direction Z, the collision position is the weak point of the battery 100, and the collision energy is 90J.

[0117] Since battery 100 is used in an electrical device such as vehicle 1000 and is mounted on vehicle 1000 via top 101, impacting bottom 102 of battery 100 in height direction Z can simulate the situation after battery 100 is installed in vehicle 1000. The weak point of battery 100 indicates the location of battery 100 that is susceptible to damage. This point is typically within a 240mm radius from the geometric center of battery 100. Impacting the weak point of battery 100 can simulate the state of battery 100 after impact at a location with relatively weak structural strength. The impact energy of 90J is equivalent to impacting battery 100 with impact head A1 at a velocity of 4.2m / s. It is understood that other impact energies can also be used to impact battery 100, for example, 120J (impact velocity of 4.9m / s) or 150J (impact velocity of 5.5m / s). In an actual experiment, the battery 100 may be impacted multiple times with one impact energy, or multiple impact energies.

[0118] After the battery 100 is impacted by the collision test device A, it is observed at ambient temperature for two hours to detect whether the battery 100 ignites or explodes. Optionally, after the battery 100 is impact tested by the collision test device A, the battery 100 may also be subjected to tests such as the enclosure protection grade, which are not limited in this embodiment of the present application.

[0119] Table 2 shows the test results of the collision test on the battery 100 using the above method when the battery cell 2 is mounted on the suspension beam 321 and different values ​​are used for the first distance H1, the weight M of a single battery cell 2, and H1 / M.

[0120] Table 2

[0121] No.H1(mm)M(Kg)H1 / M(mm / Kg)Collision testExample 75100.5No fire, no explosionExample 81052No fire, no explosionExample 91535No fire, no explosion

[0122] Example 1030130 does not catch fire or explode Example 11250.550 does not catch fire or explode Comparative Example 3350.2 catches fire or explodes Comparative Example 452152 catches fire or explodes

[0123] As shown in Table 2, when H1 satisfies 5mm≤H1≤30mm and H1 / M satisfies 0.5mm / Kg≤H1 / M≤50mm / Kg, the battery 100 will not catch fire or explode in a collision test of a certain intensity, and has good safety.

[0124] FIG9 is a schematic structural diagram of the cover 4 of the battery 100 in some embodiments of the present application. As shown in FIG9 , in some embodiments of the present application, the box 1 further includes a cover 4 disposed on the bottom 102 , and the cover 4 is fixedly connected to the box 1 .

[0125] When the bottom 102 of the box body 1 has the cover 4 , that is, the bottom 102 of the box body 1 has an opening 103 , the opening 103 faces downward in the height direction Z, and the cover 4 covers the opening 103 , so that the box body 1 has a relatively sealed structure.

[0126] In some optional embodiments, the cover 4 includes a main body 41 and a mating portion 42. The mating portion 42 is disposed circumferentially around the main body 41 and mates with the side panel 11. In other words, the main body 41 covers the opening 103 formed by the side panel 11, and the mating portion 42 is secured to the side panel 11, thereby securely connecting the cover 4 to the side panel 11. Alternatively, the mating portion 42 and the side panel 11 may be bolted together, or they may be securely connected using other methods.

[0127] In the height direction Z, the main body 41 protrudes beyond the extended surface of the bottom 102 relative to the mating portion 42. This creates a relatively large distance between the battery cells 2 disposed within the housing 1 and the cover 4, allowing for clearance between the current collecting member 24 or the second support plate 32. It should be understood that the distance the main body 41 protrudes relative to the mating portion 42 should be selected based on the energy density of the battery 100 and should not be too large, thereby increasing the volume of the battery 100 and reducing its energy density.

[0128] In some embodiments of the present application, the second support plate 32 may be fixedly connected to the cover 4 to increase the structural strength of the battery 100. Alternatively, the second support plate 32 may also abut against the cover 4, which is not limited in this embodiment of the present application.

[0129] It should be understood that the above description of some embodiments of the battery 100 is merely exemplary, and the battery 100 may also have other structures.

[0130] Referring again to Figures 2 and 3 , in some optional embodiments, the first support plate 31 is located at the top 101 of the housing 1 and is a part of the housing 1. The housing 1 also includes side panels 11, which are arranged around an opening 103 facing the bottom 102. The first support plate 31 and the cover 4 are respectively fixedly connected to the side panels 11. Specifically, the first support plate 31, the side panels 11, and the cover 4 are arranged sequentially from top to bottom along the height direction Z. The first support plate 31 is a plate extending along the length direction X, and the side panels 11 are plates extending along the height direction Z. The side panels 11 surround the first support plate 31, forming an opening 103 at the bottom 102. The cover 4 covers the opening 103, creating space within the housing 1 for the battery cells 2. The placement of the battery cells 2 on the first support plate 31 increases the rigidity of the top 101 of the battery 100 and reduces the likelihood of damage to the battery 100 in a collision.

[0131] Optionally, the side panel 11 can be integrally formed with the first support plate 31, or can be fixedly connected to the first support plate 31 by welding, bonding, fasteners, or hot-melt self-tapping technology, etc., and this embodiment of the application does not limit this.

[0132] In some optional embodiments, a cooling channel (not shown) is embedded within the first support plate 31. Since the battery cells 2 are mounted on the first support plate 31, the bottoms 102 of the battery cells 2 are in contact with the first support plate 31. To improve the performance of the battery 100, a cooling channel is embedded within the first support plate 31. Cooling gas or liquid flows through the channel, which cools the battery 100 while it is operating, thereby increasing the lifespan and usability of the battery 100.

[0133] In other optional embodiments, the cooling channel can also be provided as a water-cooling plate between the battery cell 2 and the first support plate 31, or formed as any other component that can be provided to achieve a cooling effect, which is not limited in the embodiments of the present application.

[0134] Optionally, the box body 1 may be a simple three-dimensional structure such as a cuboid or a cylinder, or a complex three-dimensional structure composed of simple three-dimensional structures such as cuboids or cylinders. The material of the box body 1 may be an alloy material such as aluminum alloy, iron alloy, or a polymer material such as polycarbonate, polyisocyanurate foam plastic, or a composite material such as glass fiber and epoxy resin. In order to improve the sealing performance of the box body 1, a sealing member such as a sealant, a sealing ring, etc. may also be provided between the cover body 4 and the side panel 11. The embodiments of the present application do not limit the above feasible settings.

[0135] Optionally, in the battery 100, multiple battery cells 2 may be connected in series, in parallel, or in a hybrid configuration. A hybrid configuration refers to multiple battery cells 2 being connected both in series and in parallel. Multiple battery cells 2 may be directly connected in series, in parallel, or in a hybrid configuration, and then the entire structure formed by the multiple battery cells 2 is housed within the housing 1. Alternatively, the battery 100 may be constructed by first connecting multiple battery cells 2 in series, in parallel, or in a hybrid configuration to form a battery module 100. Multiple battery modules 100 may then be connected in series, in parallel, or in a hybrid configuration to form a single structure, which is then housed within the housing 1.

[0136] Each battery cell 2 may be a secondary battery or a primary battery; it may also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 2 may be cylindrical, flat, rectangular, or in other shapes.

[0137] Figure 10 is a schematic diagram of the internal structure of a battery cell 2 according to some embodiments of the present application. A battery cell 2 is the smallest unit that makes up a battery 100. As shown in Figure 10 , a battery cell 2 further includes a top cover 21, a housing 22, an electrode assembly 23, and other functional components.

[0138] The top cover plate 21 is a component that covers the opening of the housing 22 to isolate the internal environment of the battery cell 2 from the external environment. The shape of the top cover plate 21 can be adapted to the shape of the housing 22 to fit the housing 22. Optionally, the top cover plate 21 can be made of a material with a certain degree of hardness and strength (such as an aluminum alloy). This prevents the top cover plate 21 from deforming when subjected to compression or collision, thus providing the battery cell 2 with greater structural strength and improved safety. Functional components such as electrode terminals 211 and explosion-proof valves are provided on the top cover plate 21. The electrode terminals 211 can be used to electrically connect to the electrode assembly 23 for inputting or outputting electrical energy to or from the battery cell 2. In some embodiments, the top cover plate 21 can also be provided with a pressure relief mechanism 212 for relieving internal pressure when the internal pressure or temperature of the battery cell 2 reaches a threshold. The top cover plate 21 can be made of a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this is not particularly limited in the present embodiment. In some embodiments, an insulating member may be provided on the inner side of the top cover plate 21 to isolate the electrical connection plate in the housing 22 from the top cover plate 21 to reduce the risk of short circuit.

[0139] The housing 22 is a component that cooperates with the top cover plate 21 to form the internal environment of the battery cell 2. This internal environment can be used to accommodate the electrode assembly 23, electrolyte (not shown), and other components. The housing 22 and top cover plate 21 can be separate components. An opening can be provided in the housing 22, and the top cover plate 21 is placed over the opening to form the internal environment of the battery cell 2. Alternatively, the top cover plate 21 and the housing 22 can be integrated. Specifically, the top cover plate 21 and the housing 22 can form a common connection surface before other components are inserted into the housing. When the interior of the housing 22 needs to be enclosed, the top cover plate 21 is placed over the housing 22. The housing 22 can be of various shapes and sizes, such as a rectangular parallelepiped, a cylinder, a hexagonal prism, etc. Specifically, the shape of the housing 22 can be determined based on the specific shape and size of the electrode assembly 23. The housing 22 can be made of a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this embodiment of the present application does not impose any particular limitations on this.

[0140] The electrode assembly 23 is a component in the battery cell 2 where electrochemical reactions occur. One or more electrode assemblies 23 may be contained in the housing 22. The electrode assembly 23 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 23, and the parts of the positive and negative electrode sheets without active materials each constitute a tab. The positive and negative electrode tabs 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 electrode active material and the negative electrode active material react with the electrolyte, and the tabs are connected to the electrode terminals 211 to form a current loop.

[0141] In some optional embodiments of the present application, a battery 100 includes a housing 1, a plurality of battery cells 2, and a stabilizing assembly 3. The battery cells 2 are placed upside down in the housing 1, with the top cover 21 facing the bottom 102 of the housing 1 in the height direction Z. The stabilizing assembly 3 includes a first support plate 31 and a second support plate 32. The first support plate 3 is disposed at the top 101 of the housing 1 in the height direction Z and is fixedly connected to the battery cells 2. The second support plate 32 is disposed at the bottom 102 of the housing 1 and is fixedly connected to the battery cells 2.

[0142] It should be noted that, unless there is any conflict, the embodiments and features in the embodiments of this application can be combined with each other.

[0143] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

DEPCT671. A battery assembled with a box body (1) with an upper (101) and lower (102) tops facing each other in the direction of the height of the box body (1), a number of battery cells (2) arranged inverted in the box body (1), a top cover plate (21) of each battery cell (2) arranged facing the lower (102) of the box body (1), and a stabilizing assembly (3) firmly connected to the battery cells (2).

2. A battery under claim 1 in which the stabilizing assembly (3) is assembled with a first support plate (31) and a second support plate (32), in which the first support plate (31) is arranged at the upper (101) of the box body (1) and firmly connected to the battery cells (2), and the second support plate (32) is arranged at the lower (102) of the box body (1) and firmly connected to the battery cells (2).3.Battery under claim 2, in which the surface of the second support plate (32) facing the battery cell (2) is provided with a number of suspension beams (321) and these beams (321) are arranged at intervals along the second support plate (32) in the direction along the length of the box body (1) and extend on the second support plate (32) in the direction along the width of the box body (1).

4. Battery under claim 3, in which the top cover plate (21) is incorporated with the working area (201) and the shoulder (202), in which the working area (201) is provided with the electrodeterminal electrodes. )(211), shoulder(202) is positioned on two sides of the working area(201) in the longitudinal direction and the battery cell(2) is fixed in place to the support beam(321) via the shoulder(202).

5. Battery under claim 4 in which the electrode(211) is arranged between two adjacent support beams(321) and the electrode(211) is arranged spaced apart from the second support plate(32).

6. Battery under claim 5 in which, in the height direction of the support beam(321), the height of the extension is greater than the height of the extension of the electrode(211).7.

8. A battery under claim 5 in which the working area (201) is provided with an additional pressure relief mechanism (212), in which the pressure relief mechanism (212) is arranged spaced apart from the second support plate (32), and the electrodes (211) are arranged on both sides of the pressure relief mechanism (212) in the longitudinal direction.

9. A battery under claim 4 in which the shoulders (202) of two adjacent battery cells (2) are attached together to the same support beam (321).

10. A battery under claim 8 in which in the longitudinal direction the width D1 of the support beam ( 321) and the width of the extension D2 of the shoulder (202) corresponds to: 0.5D2 less than or equal to D1 less than or equal to 2D210. A battery according to claim 3 in which two adjacent battery cells (2) are electrically connected via a bus component (24) and the length of the extension of one of the two adjacent support beams (321) is less than the length of the extension of the other in the width direction to form a bypass groove (322) in which the bypass groove (322) is configured to bypass the bus component (24)11.

12. A battery under claim 3 in which the support beam (321) is formed as a single unit with or detached from a second support plate (32).

13. A battery under claim 12 in which, in the height direction, the height of the extension of the support beam (321) is dimension one H1, in which dimension one H1 corresponds to 0.5 mm less than or equal to H1 less than or equal to 30 mm.

14. A battery under claim 12 in which the ratio H1 / M of dimension one H1 to the weight M of a single battery cell (2) corresponds to 0.05 mm / kg less than or equal to 30 mm.

14. A battery under claim 2 in which the box body (1) is incorporated with an additional body of the enclosure (4) arranged at the bottom (102) and the body of the enclosure (4) is permanently connected to the box body (1).

15. A battery under claim 14 in which a second support plate (32) is permanently connected to the body of the enclosure (4).

16. An electrical device incorporating any of the batteries under claims 1-15 in which the batteries are configured to supply electrical power;

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