Battery and electrical device

Abstract

Provided are a battery and an electrical device. The battery comprises a case, a plurality of battery cells, a first fixing member and a restraining member. The case comprises a first beam and a second beam which are arranged opposite each other in a first direction. The plurality of battery cells are accommodated in the case and arranged between the first beam and the second beam. At least part of the first fixing member is embedded into the first beam and is fixed to the first beam. The restraining member is connected to the first fixing member and the second beam. When a battery cell expands, the restraining member can provide restraining force for the first beam and the second beam, and deformation of the first beam and the second beam under the action of expansion force is reduced, thereby limiting the expansion amount of the battery cell, and improving the cycle performance of the battery cell.

Description

Batteries and electrical devices

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese patent application No. 202420644654.7, filed on March 29, 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] With the development of battery technology, batteries are being used in more and more fields and are gradually replacing traditional fossil energy in the field of automobile power. Batteries can store chemical energy and controllably convert chemical energy into electrical energy.

[0005] How to improve battery reliability is an important research direction in the industry. Summary of the Invention

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

[0007] In a first aspect, the present application provides a battery comprising a housing, a plurality of battery cells, a first fixing member, and a restraining member. The housing comprises a first beam and a second beam disposed opposite each other along a first direction. The plurality of battery cells are housed within the housing and arranged between the first beam and the second beam. The first fixing member is at least partially embedded in and secured to the first beam. The restraining member connects the first fixing member and the second beam.

[0008] When the battery cell expands, the restraint can provide a restraining force to the first beam and the second beam, reducing the deformation of the first beam and the second beam under the action of the expansion force, thereby limiting the expansion of the battery cell and improving the cycle performance of the battery cell. The first fixing member is embedded in the first beam, thereby improving the connection strength between the first fixing member and the first beam and reducing the risk of failure of the connection between the first fixing member and the first beam. The restraint can be connected to the first beam through the first fixing member, and the connection between the first fixing member and the restraint is not restricted by the first beam. In this way, the connection method between the first fixing member and the restraint can be flexibly selected as needed, thereby improving the connection strength between the first fixing member and the restraint. By providing the first fixing member, the connection strength between the restraint and the first beam can be improved, reducing the risk of separation between the restraint and the first beam under the action of the expansion force, improving the performance of the battery cell, and improving the reliability of the battery.

[0009] In some embodiments, the battery further includes a first connector that passes through the restraining member and is connected to the first fixing member. The first connector, passing through the restraining member, is subjected to shear forces when the battery cell expands. The first connector can withstand greater expansion forces, thereby reducing the risk of failure in the connection between the restraining member and the first fixing member.

[0010] In some embodiments, the first connecting member comprises a bolt, which has high strength and is not easily deformed under shear force, thereby maintaining a stable connection between the restraining member and the first fixing member.

[0011] In some embodiments, the battery includes multiple first fixing members spaced apart along a second direction intersecting the first direction. The battery also includes multiple restraining members arranged along the second direction, each of which is connected to at least one of the first fixing members. By providing multiple restraining members and multiple first fixing members, the restraining force on the first and second beams can be increased, reducing the risk of deformation of the first and second beams under the action of expansion forces.

[0012] In some embodiments, the first beam has multiple cavities within it. The provision of these cavities can reduce the weight of the first beam and increase the energy density of the battery. The walls of these cavities can also disperse stress, improving the bending resistance of the first beam and reducing the risk of the first beam tipping over.

[0013] In some embodiments, the first beam has a cavity inside, and the first fixing member is accommodated in the cavity. By providing the cavity, the first fixing member can be entirely embedded in the interior of the first beam, thereby improving the connection strength between the first fixing member and the first beam.

[0014] In some embodiments, the first beam comprises multiple beam components, which are connected to define multiple cavities. The first beam is a spliced ​​structure, with each beam component independently formed. This improves the balance of weight and strength of the first beam. Furthermore, the first fixing member can be fixed to a beam component before the first beam is assembled, thereby reducing the difficulty of assembling the first fixing member.

[0015] In some embodiments, the plurality of beam members are welded. Welding is easy to implement and can improve the connection strength between the beam members.

[0016] In some embodiments, the multiple beam components include a first beam component, a second beam component, and a third beam component. The first beam component and the second beam component are connected and define a storage space. At least a portion of the third beam component is disposed within the storage space, dividing the storage space into a plurality of cavities. The third beam component can function as a reinforcing rib and can transmit expansion force between the first beam component and the second beam component. The spliced ​​structure of the first beam component, the second beam component, and the third beam component can enhance the structural strength of the first beam component and its ability to resist the expansion force of the battery cell, thereby improving the reliability of the battery.

[0017] In some embodiments, the first beam component includes a first wall and a second wall connected to each other, and the second beam component includes a third wall and a fourth wall connected to each other. The first wall and the third wall are spaced apart along a first direction, and the first fixing member is disposed between the first wall and the third wall. In a third direction, the second wall and the fourth wall are stacked between the restraining member and the first fixing member, and the third direction intersects with the first direction. The battery also includes a first connecting member, which passes through the restraining member, the second wall and the fourth wall and is connected to the first fixing member. The second wall and the fourth wall form a double-layer structure, and the two can restrain the first connecting member, reducing the risk of the first connecting member tilting under the pulling force of the restraining member.

[0018] In some embodiments, the first wall is disposed on a side of the third wall facing away from the battery cells. The first wall is provided with a through hole, the wall of which is welded to the first fixing member. The provision of the through hole allows for welding the first wall and the first fixing member from the outside after the first beam is assembled, thereby further improving the connection strength between the first beam and the first fixing member.

[0019] In some embodiments, the third beam member includes a fifth wall located on a side of the first fixing member facing away from the fourth wall, and the fifth wall abuts against and connects to the first fixing member. The fifth wall can secure the first fixing member and, together with the fourth wall, limit the first fixing member from both sides, thereby further improving the connection strength between the first fixing member and the first beam.

[0020] In some embodiments, the housing includes a load-bearing plate, and the battery cell is connected to the load-bearing plate. The first beam component includes a first wall and a sixth wall connected to each other, and the second beam component includes a third wall and a seventh wall connected to each other. The first wall and the third wall are spaced apart along a first direction, and the first wall is arranged on the side of the third wall facing away from the battery cell. The seventh wall extends from an end of the third wall close to the load-bearing plate toward a side away from the battery cell, and the sixth wall extends from an end of the first wall close to the load-bearing plate toward a side away from the battery cell. The seventh wall is stacked and fixed with the load-bearing plate, and the sixth wall is located on the side of the seventh wall facing away from the load-bearing plate and fixed to the seventh wall. The seventh wall is bent relative to the third wall toward a side away from the battery cell, which can reduce the risk of interference between the seventh wall and the battery cell.

[0021] In some embodiments, the battery further includes a second connector connecting the seventh wall and the support plate. The sixth wall is provided with a clearance structure for clearing the second connector. The provision of the clearance structure reduces the risk of interference between the sixth wall and the second connector. The second connector only needs to connect the seventh wall and the support plate, not the sixth wall, thus simplifying installation.

[0022] In some embodiments, a recess is provided at one end of the first beam along a third direction intersecting the first direction. The first fixing member is at least partially accommodated in the recess. The recess is provided on the first beam to facilitate the first fixing member to be embedded in the first beam.

[0023] In some embodiments, a portion of the first beam is located between the first fixing member and the battery cell in the first direction. The first beam can limit the first fixing member in the first direction to reduce the risk of the first fixing member separating from the first beam under the tension of the restraint member.

[0024] In some embodiments, the first fixing member is welded to the first beam.

[0025] In some embodiments, the first fixing member includes a fixed body and a flange portion connected to each other, with at least a portion of the fixed body being accommodated in the recess. The fixed body is fixed to the restraining member, and the flange portion abuts against an end surface of the first beam along the third direction. The battery further includes a third connecting member connecting the flange portion and the first beam. In locations where there is no space for welding, the first fixing member can be connected via the third connecting member.

[0026] In some embodiments, the first beam is an integrally formed structure to enhance the structural strength of the first beam and reduce the assembly process of the first beam.

[0027] In some embodiments, the restraint is connected to at least two battery cells. Connecting the restraint to the battery cells can increase the connection strength between the battery cells and the casing, reduce the shaking of the battery cells relative to the casing when the battery is impacted, and improve the stability and reliability of the battery.

[0028] In some embodiments, the housing includes a support plate, with the battery cells and the first beam positioned on one side of the support plate along a third direction perpendicular to the first direction. Electrode terminals are provided on the side of the battery cells facing away from the support plate, and the restraining members are attached to the surface of the battery cells facing away from the support plate. In the third direction, the restraining members do not overlap with the electrode terminals. The restraining members avoid the electrode terminals, thereby reducing the risk of interference between the restraining members and the busbars connected to the electrode terminals.

[0029] In some embodiments, the battery further includes a second fixing member, at least a portion of which is embedded in the second beam and fixed to the second beam. The restraint member connects the first fixing member and the second fixing member.

[0030] In some embodiments, the restraining member is a strip-shaped structure. Using a strip-shaped restraining member can improve the space utilization inside the battery and increase the energy density of the battery.

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

[0032] The features, advantages and technical effects of exemplary embodiments of the present application will be described below with reference to the accompanying drawings.

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

[0034] FIG2 is a schematic structural diagram of a battery provided in some embodiments of the present application;

[0035] FIG3 is an enlarged schematic diagram of the circle frame in FIG2 ;

[0036] FIG4 is a partial cross-sectional schematic diagram taken along the AA direction in FIG3 ;

[0037] FIG5 is an enlarged schematic diagram of the circle frame of FIG4;

[0038] FIG6 is a schematic structural diagram of a first beam of a battery provided in some embodiments of the present application;

[0039] FIG7 is an exploded schematic diagram of a partial structure of a battery provided in some embodiments of the present application;

[0040] FIG8 is an enlarged schematic diagram of the circle frame of FIG7;

[0041] FIG9 is a schematic diagram showing the structure of batteries provided in some other embodiments of the present application;

[0042] FIG10 is an enlarged schematic diagram of the circle frame of FIG9;

[0043] FIG11 is a schematic partial cross-sectional view of a battery provided in some embodiments of the present application.

[0044] Description of the accompanying drawings: 1. vehicle; 2. battery; 3. controller; 4. motor; 10. housing; 11. load-bearing plate; 12. frame; 13. first beam; 131. first beam member; 1311. first wall; 1311a. through-hole; 1312. second wall; 1313. sixth wall; 132. second beam member; 1321. third wall; 1322. fourth wall; 1323. seventh wall; 133. third beam member; 1331. fifth wall; 1332. eighth wall; 1333. ninth wall; 13a. cavity; 13b. recess; 14. second beam; 15. third beam; 20. battery cell; 21. electrode terminal; 30. first fixing member; 31. fixing body; 32. flange; 40. Constraint; 41. Metal strip; 42. Insulation layer; 50. First connector; 51. Head; 52. Rod; 60. Second connector; 70. Second fixing member; 80. Third connector; S. Avoidance structure; X, first direction; Y, second direction; Z, third direction. DETAILED DESCRIPTION

[0045] 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 and completely described below in conjunction with the accompanying 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.

[0046] 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.

[0047] 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.

[0048] 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.

[0049] 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.

[0050] 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.

[0051] In the embodiments of this application, "parallel" includes not only absolute parallelism but also approximately parallelism as commonly understood in engineering practice. Similarly, "perpendicular" also includes not only absolute perpendicularity but also approximately perpendicularity as commonly understood in engineering practice. For example, if the angle between two directions is 85°-90°, they are considered perpendicular; if the angle between two directions is 0°-5°, they are considered parallel.

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

[0053] The battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity.

[0054] The battery cell may be a secondary battery cell. A secondary battery cell refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0055] The battery cells can be lithium-ion battery cells, sodium-ion battery cells, sodium-lithium-ion battery cells, lithium metal battery cells, sodium metal battery cells, lithium-sulfur battery cells, magnesium-ion battery cells, nickel-hydrogen battery cells, nickel-cadmium battery cells, lead-acid battery cells, etc.

[0056] In some embodiments, the battery may be an energy storage device. Exemplarily, the energy storage device includes an energy storage container, an energy storage cabinet, and the like.

[0057] In some embodiments, the battery further includes a box in which the battery cells are housed. The box can protect the battery cells from the outside, thereby reducing the risk of battery cell failure.

[0058] 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.

[0059] Currently, based on market developments, batteries are widely used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in power tools, drones, energy storage devices, and other fields. As the application areas of batteries continue to expand, market demand is also growing.

[0060] During battery use, battery cells may expand due to charging and discharging, or other factors. This uncontrolled expansion can cause performance degradation. To securely restrain the battery cells, expansion beams are typically installed within the enclosure. These beams resist the expansion force of the battery cells, limiting their expansion and slowing performance degradation while reducing the risk of enclosure deformation.

[0061] In some embodiments, in order to improve the expansion beam's ability to resist expansion force and reduce deformation of the expansion beam, a restraint is usually used to connect the expansion beam; the restraint can share part of the expansion force and reduce deformation of the expansion beam.

[0062] However, due to the structure of the expansion beam, if the restraint is directly connected to the expansion beam, there will be a problem of insufficient connection strength between the restraint and the expansion beam, which will cause the risk of separation of the restraint and the expansion beam under the action of the expansion force, resulting in the expansion force being unable to effectively restrain the battery cell, affecting the performance of the battery cell and the reliability of the battery.

[0063] In view of this, the present application provides a technical solution, which embeds a fixing part on the beam and uses the fixing part to connect with the restraint part, so that the connection method between the fixing part and the restraint part is more flexible, the connection strength between the beam and the restraint part is improved, the cycle performance of the battery cell is improved, and the reliability of the battery is improved.

[0064] The battery described in the embodiments of the present application is suitable for use in electrical devices that use the battery.

[0065] 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.

[0066] For the convenience of description, the following embodiments are described by taking a vehicle as an example of an electrical device.

[0067] FIG1 is a schematic structural diagram of a vehicle provided in some embodiments of the present application.

[0068] 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.

[0069] 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.

[0070] 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.

[0071] Figure 2 is a schematic diagram of the structure of a battery provided in some embodiments of the present application; Figure 3 is an enlarged schematic diagram of the circle frame of Figure 2; Figure 4 is a schematic diagram of a partial cross-section taken along the AA direction of Figure 3; Figure 5 is an enlarged schematic diagram of the circle frame of Figure 4; Figure 6 is a schematic diagram of the structure of a first beam of a battery provided in some embodiments of the present application; Figure 7 is an exploded schematic diagram of a partial structure of a battery provided in some embodiments of the present application; and Figure 8 is an enlarged schematic diagram of the circle frame of Figure 7.

[0072] 2 to 8 , an embodiment of the present application provides a battery 2 , which includes a housing 10 and a battery cell 20 . The battery cell 20 is accommodated in the housing 10 .

[0073] In the battery 2 , there can be one or more battery cells 20 . For example, there are multiple battery cells 20 , and the multiple battery cells 20 can be connected in series, in parallel, or in mixed connection. Mixed connection means that the multiple battery cells 20 are connected in both series and in parallel.

[0074] As an example, the battery cell 20 may be a prismatic battery cell, a soft-pack battery cell, or a battery cell of another shape. Prismatic battery cells include square-shell battery cells, blade-shaped battery cells, and polygonal battery cells. Polygonal battery cells are, for example, hexagonal battery cells.

[0075] The box 10 can be in various shapes, such as a cylinder, a cuboid, etc.

[0076] The material of the box body 10 can be steel, aluminum, aluminum alloy or other materials.

[0077] In some embodiments, the housing 10 includes a carrier plate 11 and a frame 12 connected to the carrier plate 11. The frame 12 and the carrier plate 11 enclose an interior space for accommodating the battery cells 20. For example, the frame 12 is disposed along the periphery of the carrier plate 11 and is fixedly connected to the carrier plate 11.

[0078] In some embodiments, the battery cells 20 are fixed to the carrier plate 11 . For example, the battery cells 20 may be bonded to the carrier plate 11 .

[0079] In some embodiments, the box body 10 also includes a cover plate (not shown), which is arranged opposite to the supporting plate 11, and the frame 12 connects the cover plate and the supporting plate 11. The frame 12, the cover plate and the supporting plate 11 together form a accommodating cavity of the box body 10, and multiple battery cells 20 can be arranged in the accommodating cavity.

[0080] When the battery 2 is installed in the electrical device, the cover plate can be located on the upper side of the carrier plate 11 or on the lower side of the carrier plate 11 .

[0081] In some embodiments, the frame 12 includes a plurality of side beams, which are arranged along the circumference of the bearing plate 11 and connected in sequence to form an annular frame.

[0082] In some embodiments, the battery 2 includes a housing 10, a plurality of battery cells 20, a first fixing member 30, and a restraining member 40. The housing 10 includes a first beam 13 and a second beam 14 disposed opposite each other along a first direction X. The plurality of battery cells 20 are housed within the housing 10 and arranged between the first beam 13 and the second beam 14. The first fixing member 30 is at least partially embedded in and secured to the first beam 13. The restraining member 40 connects the first fixing member 30 and the second beam 14.

[0083] For example, the first beam 13 and the second beam 14 can be used to resist the expansion force of the battery cell 20. The first beam 13 and the second beam 14 can also be called expansion beams of the box body 10.

[0084] The first beam 13 can be a side beam of the box body 10 or a beam inside the box body 10. The second beam 14 can be a side beam of the box body 10 or a beam inside the box body 10.

[0085] The first beam 13 may be an integrally formed component, for example, the first beam 13 may be a profile beam integrally formed by an extrusion process. Alternatively, the first beam 13 may be formed by splicing multiple components, for example, the first beam 13 may be welded from multiple sheet metal parts.

[0086] For example, the plurality of battery cells 20 may be arranged in one row or in multiple rows.

[0087] The first fixing member 30 may be entirely embedded in the first beam 13 , or may be only partially embedded in the first beam 13 .

[0088] There may be one or more first fixing members 30. For example, there may be more than one first fixing member 30, and the multiple first fixing members 30 may have the same structure or different structures.

[0089] The first fixing member 30 can be fixed to the first beam 13 by welding, clamping, riveting, bolting, bonding or other methods.

[0090] There can be one or more restraining members 40. One restraining member 40 can be connected to one first fixing member 30 or connected to multiple first fixing members 30 at the same time.

[0091] The restraining member 40 may be connected to the first fixing member 30 by welding, snapping, fastener connection or other connection methods.

[0092] The restraining member 40 is a strip structure, a line structure, a beam structure or other structures. Exemplarily, the restraining member 40 extends along the first direction X.

[0093] When the battery cell 20 expands, the restraint 40 provides a restraining force on the first beam 13 and the second beam 14, reducing deformation of the first beam 13 and the second beam 14 under the action of the expansion force, thereby limiting the expansion of the battery cell 20 and improving the cycling performance of the battery cell 20. The first fixing member 30 is embedded in the first beam 13, thereby enhancing the connection strength between the first fixing member 30 and the first beam 13 and reducing the risk of failure of the connection between the first fixing member 30 and the first beam 13. The restraint 40 can be connected to the first beam 13 through the first fixing member 30, and the connection between the first fixing member 30 and the restraint 40 is not restricted by the first beam 13. This allows for flexible selection of the connection method between the first fixing member 30 and the restraint 40 as needed, improving the connection strength between the first fixing member 30 and the restraint 40. The provision of the first fixing member 30 can enhance the connection strength between the restraint 40 and the first beam 13, reduce the risk of separation between the restraint 40 and the first beam 13 under the action of the expansion force, improve the performance of the battery cell 20, and enhance the reliability of the battery 2.

[0094] In some embodiments, the restraint 40 may apply a pre-tensioning force to the first beam 13 and the second beam 14 .

[0095] In some embodiments, both ends of the first beam 13 along the second direction Y are connected to the frame 12 of the box 10 . Both ends of the second beam 14 along the second direction Y are connected to the frame 12 of the box 10 .

[0096] In some embodiments, the restraining member 40 is a strip-shaped structure. The strip-shaped structure is low-cost and occupies little space. The use of the restraining member 40 with a strip-shaped structure can improve the space utilization inside the battery 2 and increase the energy density of the battery 2.

[0097] For example, compared to using a restraint with a beam-like structure, a restraint with a strip-like structure can improve energy density.

[0098] In some embodiments, the restraint 40 comprises a metal strap 41. Exemplarily, the restraint 40 comprises a steel strap.

[0099] In some embodiments, a cavity 13a is formed inside the first beam 13. There may be one or more cavity 13a.

[0100] In some embodiments, the first beam 13 has multiple cavities 13a within it. The provision of cavities 13a can reduce the weight of the first beam 13 and increase the energy density of the battery 2. The walls of the multiple cavities 13a also disperse stress, improving the bending resistance of the first beam 13 and reducing the risk of the first beam 13 toppling.

[0101] In some embodiments, the battery 2 further includes a first connecting member 50 , which passes through the restraining member 40 and is connected to the first fixing member 30 .

[0102] The first connector 50 passes through the restraining member 40 and is subject to shear forces when the battery cell 20 expands. Compared to welding the restraining member 40 to the first fixing member 30, the first connector 50 can withstand greater expansion forces, thereby reducing the risk of failure in the connection between the restraining member 40 and the first fixing member 30.

[0103] Exemplarily, the restraining member 40 includes a metal strip 41 , and the first connecting member 50 passes through the metal strip 41 along a thickness direction of the metal strip 41 .

[0104] In some embodiments, the first connecting member 50 comprises a fastener. Optionally, the fastener comprises a bolt, a screw, a rivet or a pin.

[0105] In some embodiments, the first connecting member 50 comprises a bolt. The bolt has high strength and is not easily deformed under the action of shear force, thereby maintaining a stable connection between the restraining member 40 and the first fixing member 30.

[0106] In some embodiments, the first fixing member 30 has a threaded hole. A portion of the first connecting member 50 extends into the threaded hole and is threadedly connected to the first fixing member 30 .

[0107] In some embodiments, the battery 2 includes a plurality of first fixing members 30 , which are spaced apart along a second direction Y, where the second direction Y intersects the first direction X. The battery 2 includes a plurality of restraining members 40 arranged along the second direction Y, each restraining member 40 being connected to at least one first fixing member 30 .

[0108] By providing a plurality of restraining members 40 and a plurality of first fixing members 30 , the restraining force on the first beam 13 and the second beam 14 can be increased, and the risk of deformation of the first beam 13 and the second beam 14 under the action of the expansion force can be reduced.

[0109] In some embodiments, the second direction Y is perpendicular to the first direction X. Exemplarily, both the first beam 13 and the second beam 14 extend along the second direction Y.

[0110] In some embodiments, the number of the restraining members 40 is the same as the number of the first fixing members 30 , and the plurality of restraining members 40 and the plurality of first fixing members 30 are arranged in a one-to-one correspondence.

[0111] In some embodiments, the first beam 13 has a cavity 13a therein, and the first fixing member 30 is accommodated in the cavity 13a. By providing the cavity 13a, the first fixing member 30 can be entirely embedded in the interior of the first beam 13, thereby improving the connection strength between the first fixing member 30 and the first beam 13.

[0112] For example, the first connecting member 50 includes a bolt that passes through the first beam 13 and is threadedly connected to the first fixing member 30. Accommodating the first fixing member 30 within the cavity 13a can increase the size of the bolt and the threaded connection length between the bolt and the first fixing member 30, thereby reducing the risk of the bolt tilting or deforming under the action of shear force.

[0113] In some embodiments, multiple first fixing members 30 are accommodated in the same cavity 13a. The multiple first fixing members 30 are spaced apart in the cavity 13a along the second direction Y, which can reduce the overall weight and volume of the multiple first fixing members 30 and improve energy density.

[0114] In some embodiments, the first beam 13 includes a plurality of beam members connected to define a plurality of cavities 13 a.

[0115] The first beam 13 is a spliced ​​structure, and each beam component is independently formed, which can better balance the weight and strength of the first beam 13. In addition, the first fixing member 30 can be fixed to a beam component before the first beam 13 is assembled, thereby reducing the difficulty of assembling the first fixing member 30.

[0116] In some embodiments, the plurality of beam members are welded. Welding is easy to implement and can improve the connection strength between the beam members.

[0117] In some embodiments, the beam member is a steel sheet metal member.

[0118] In some embodiments, the multiple beam components include a first beam component 131, a second beam component 132 and a third beam component 133. The first beam component 131 and the second beam component 132 are connected and define a receiving space. At least a portion of the third beam component 133 is disposed in the receiving space and divides the receiving space into multiple cavities 13a.

[0119] The third beam member 133 acts as a reinforcing rib and can transmit expansion forces between the first beam member 131 and the second beam member 132. The spliced ​​structure of the first beam member 131, the second beam member 132, and the third beam member 133 can enhance the structural strength of the first beam member 13 and its ability to resist the expansion forces of the battery cells 20, thereby improving the reliability of the battery 2.

[0120] In some embodiments, the first beam member 131 includes a first wall 1311 and a second wall 1312 connected to each other, and the second beam member 132 includes a third wall 1321 and a fourth wall 1322 connected to each other. The first wall 1311 and the third wall 1321 are spaced apart along the first direction X, and the first fixing member 30 is disposed between the first wall 1311 and the third wall 1321.

[0121] When the first fixing member 30 is subjected to the pulling force of the restraining member 40, the first wall 1311 and the third wall 1321 can limit the first fixing member 30 in the first direction X, thereby reducing the risk of relative movement between the first fixing member 30 and the first beam 13 and improving the stability of the connection between the first fixing member 30 and the first beam 13.

[0122] In some embodiments, the battery 2 further includes a first connecting member 50 , which passes through the restraining member 40 , the second wall 1312 , and the fourth wall 1322 and is connected to the first fixing member 30 .

[0123] The second wall 1312 and the fourth wall 1322 form a double-layer structure, which can restrain the first connecting member 50 and reduce the risk of the first connecting member 50 tilting under the pulling force of the restraint member 40.

[0124] In some embodiments, the restraining member 40 , the second wall 1312 , the fourth wall 1322 and the first fixing member 30 are stacked in sequence along the third direction Z. Exemplarily, the first direction X, the second direction Y and the third direction Z are perpendicular to each other.

[0125] In some embodiments, the first connecting member 50 includes a head 51 and a rod 52, the rod 52 passes through the restraining member 40, the second wall 1312 and the fourth wall 1322 and is connected to the first fixing member 30, and the head 51 and the first fixing member 30 clamp the restraining member 40, the second wall 1312 and the fourth wall 1322.

[0126] In some embodiments, the first wall 1311 is disposed on a side of the third wall 1321 facing away from the battery cell 20 . The first wall 1311 defines a through hole 1311 a , and a wall of the through hole 1311 a is welded to the first fixing member 30 .

[0127] By providing the through hole 1311 a , the first wall 1311 and the first fixing member 30 can be welded from the outside after the first beam 13 is assembled, thereby further improving the connection strength between the first beam 13 and the first fixing member 30 .

[0128] In some embodiments, the third beam member 133 includes a fifth wall 1331 . The fifth wall 1331 is located on a side of the first fixing member 30 away from the fourth wall 1322 , and the fifth wall 1331 abuts against and is connected to the first fixing member 30 .

[0129] The fifth wall 1331 can fix the first fixing member 30 and, together with the fourth wall 1322 , limit the first fixing member 30 from two sides, thereby further improving the connection strength between the first fixing member 30 and the first beam 13 .

[0130] In some embodiments, the fifth wall 1331 is inclined relative to the first direction X. When the first beam 13 is subjected to an expansion force, the inclined fifth wall 1331 can decompose the stress and reduce the risk of the first beam 13 falling.

[0131] In some embodiments, the fifth wall 1331 is welded to the first fixing member 30 .

[0132] In some embodiments, the first wall 1311 , the second wall 1312 , the third wall 1321 , the fourth wall 1322 and the fifth wall 1331 may limit the first fixing member 30 from the periphery, thereby reducing the stress on the weld on the first fixing member 30 and lowering the risk of weld cracking.

[0133] In some embodiments, the housing 10 includes a carrier plate 11, to which the battery cells 20 are connected. The first beam member 131 includes a first wall 1311 and a sixth wall 1313 connected to each other, and the second beam member 132 includes a third wall 1321 and a seventh wall 1323 connected to each other. The first wall 1311 and the third wall 1321 are spaced apart along a first direction X, with the first wall 1311 being located on the side of the third wall 1321 facing away from the battery cells 20. The seventh wall 1323 extends from an end of the third wall 1321 proximal to the carrier plate 11 toward a side away from the battery cells 20, and the sixth wall 1313 extends from an end of the first wall 1311 proximal to the carrier plate 11 toward a side away from the battery cells 20. The seventh wall 1323 is stacked and fixed to the carrier plate 11, with the sixth wall 1313 located on the side of the seventh wall 1323 facing away from the carrier plate 11 and fixed to the seventh wall 1323.

[0134] The seventh wall 1323 is bent relative to the third wall 1321 toward a side away from the battery cell 20 , which can reduce the risk of interference between the seventh wall 1323 and the battery cell 20 .

[0135] In some embodiments, the sixth wall 1313 is welded to the seventh wall 1323 .

[0136] In some embodiments, the battery 2 further includes a second connector 60 , which connects the seventh wall 1323 and the carrier plate 11 . The sixth wall 1313 is provided with an escape structure S for escaping the second connector 60 .

[0137] For example, the avoidance structure S may include a hole, a slot, a notch or other structures.

[0138] The avoidance structure S can reduce the risk of interference between the sixth wall 1313 and the second connector 60. The second connector 60 only needs to connect the seventh wall 1323 and the bearing plate 11, without being connected to the sixth wall 1313, which can reduce the difficulty of installing the second connector 60.

[0139] In some embodiments, the second connector 60 includes a rivet.

[0140] In some embodiments, the avoidance structure S includes a avoidance recess.

[0141] In some embodiments, the third beam member 133 further includes an eighth wall 1332 , at least a portion of the eighth wall 1332 being disposed between the sixth wall 1313 and the seventh wall 1323 .

[0142] Optionally, the eighth wall 1332 is also provided with an avoidance structure S for avoiding the second connecting member 60 , such as an avoidance gap.

[0143] In some embodiments, the eighth wall 1332 is welded to the sixth wall 1313 and the seventh wall 1323 .

[0144] In some embodiments, the third beam member 133 further includes a plurality of ninth walls 1333, and the plurality of ninth walls 1333 are sequentially connected between the eighth wall 1332 and the fifth wall 1331. Exemplarily, two adjacent ninth walls 1333 are bent relative to each other.

[0145] The plurality of ninth walls 1333 can improve the rigidity of the first beam 13 .

[0146] In some embodiments, the restraint 40 is connected to at least two battery cells 20. Connecting the restraint 40 to the battery cells 20 can increase the overall connection strength between the battery cells 20 and the housing 10, reduce the shaking of the battery cells 20 relative to the housing 10 when the battery 2 is impacted, and improve the stability and reliability of the battery 2.

[0147] In some embodiments, the plurality of battery cells 20 are arranged to form a plurality of battery columns, each battery column includes at least two battery cells 20 arranged along a first direction X, and the plurality of battery columns are arranged along a second direction Y.

[0148] In some embodiments, the restraint 40 is connected to the battery cells 20 of two adjacent battery columns.

[0149] In some embodiments, the restraint 40 is bonded to the battery cell 20 .

[0150] In some embodiments, the restraint 40 includes a metal strip 41 and an insulating layer 42 wrapped around the outside of the metal strip 41 , and the insulating layer 42 is bonded to the battery cell 20 .

[0151] In some embodiments, the box body 10 includes a supporting plate 11 , and the battery cells 20 and the first beams 13 are located on one side of the supporting plate 11 along a third direction Z, which is perpendicular to the first direction X.

[0152] The battery cell 20 is provided with an electrode terminal 21 on a side facing away from the carrier plate 11. The restraint member 40 is connected to the surface of the battery cell 20 facing away from the carrier plate 11. In the third direction Z, the restraint member 40 does not overlap with the electrode terminal 21.

[0153] Exemplarily, the electrode terminal 21 is used to lead out the electrical energy inside the battery cell 20 .

[0154] The restraining member 40 avoids the electrode terminal 21 , thereby reducing the risk of the restraining member 40 interfering with the busbar connected to the electrode terminal 21 .

[0155] In some embodiments, both electrode terminals 21 are disposed on a side of the battery cell 20 facing away from the carrier plate 11. One electrode terminal 21 is a positive electrode terminal, and the other electrode terminal 21 is a negative electrode terminal.

[0156] In some embodiments, the battery 2 further includes a second fixing member 70 , at least a portion of which is embedded in and fixed to the second beam 14 . The restraining member 40 connects the first fixing member 30 and the second fixing member 70 .

[0157] The structure of the second fixing member 70 may be the same as or different from that of the first fixing member 30 .

[0158] In some embodiments, the second fixing member 70 is entirely embedded in the second beam 14 .

[0159] In some embodiments, the box body 10 further includes a third beam 15 , which is disposed between the first beam 13 and the second beam 14 . A portion of the battery cells 20 are arranged between the first beam 13 and the third beam 15 , and another portion of the battery cells 20 are arranged between the second beam 14 and the third beam 15 .

[0160] In some embodiments, the restraint 40 is also connected to the third beam 15 .

[0161] FIG9 is a schematic structural diagram of batteries provided in some other embodiments of the present application; FIG10 is an enlarged schematic diagram of the circle frame of FIG9; and FIG11 is a schematic partial cross-sectional diagram of batteries provided in some embodiments of the present application.

[0162] 9 to 11 , in some embodiments, a recess 13 b is provided at one end of the first beam 13 along a third direction Z, which intersects the first direction X. At least a portion of the first fixing member 30 is accommodated in the recess 13 b. Providing the recess 13 b on the first beam 13 facilitates the insertion of the first fixing member 30 into the first beam 13 .

[0163] In some embodiments, a portion of the first beam 13 is located between the first fixing member 30 and the battery cell 20 in the first direction X. The first beam 13 can limit the first fixing member 30 in the first direction X to reduce the risk of the first fixing member 30 separating from the first beam 13 under the tension of the restraining member 40.

[0164] In some embodiments, the first fixing member 30 is welded to the first beam 13 .

[0165] In other embodiments, the first fixing member 30 includes a fixing body 31 and a flange portion 32 connected to each other, at least a portion of the fixing body 31 is accommodated in the recess 13b, the fixing body 31 is fixed to the restraining member 40, and the flange portion 32 is abutted against the end face of the first beam 13 along the third direction Z; the battery 2 also includes a third connecting member 80, which connects the flange portion 32 and the first beam 13.

[0166] For locations where there is no space for welding operations, the first fixing member 30 may be connected via the third connecting member 80 .

[0167] For example, if the first beam 13 is close to the side beam of the box body 10 and the first fixing member 30 cannot be fixed to the first beam 13 by welding, then the first fixing member 30 can be provided with a flange portion 32 to be fixed to the first beam 13 by rivets.

[0168] Exemplarily, the third connecting member 80 includes a rivet.

[0169] In some embodiments, there are multiple first fixing members 30. In some examples, all first fixing members 30 are welded to the first beam 13. In other examples, all first fixing members 30 are fixed to the first beam 13 via the third connecting member 80. In still other examples, some first fixing members 30 are welded to the first beam 13, while other first fixing members 30 are fixed to the first beam 13 via the third connecting member 80.

[0170] In some embodiments, the first beam 13 is an integrally formed structure to enhance the structural strength of the first beam 13 and reduce the assembly process of the first beam 13 .

[0171] In some embodiments, the first beam 13 is a multi-cavity profile structure and has reinforcing ribs disposed inside the first beam 13 to enhance its rigidity.

[0172] In some embodiments, the battery 2 further includes a second fixing member 70 , at least a portion of which is embedded in and fixed to the second beam 14 . The restraining member 40 connects the first fixing member 30 and the second fixing member 70 .

[0173] In some embodiments, the second fixing member 70 is riveted to the second beam 14 .

[0174] The present application also provides an electrical device, comprising the battery 2 of any of the above embodiments, the battery 2 being used to provide electrical energy to the electrical device. The electrical device may be any of the above-mentioned devices or systems using the battery 2.

[0175] 2 to 8 , an embodiment of the present application provides a box 10 , a plurality of battery cells 20 , a first fixing member 30 , a second fixing member 70 , and a restraining member 40 .

[0176] The box body 10 includes a supporting plate 11, a first beam 13, and a second beam 14. The first beam 13 and the second beam 14 are disposed on one side of the supporting plate 11 and connected to the supporting plate 11. The first beam 13 and the second beam 14 are disposed opposite to each other along a first direction X.

[0177] A plurality of battery cells 20 are housed in the box body 10 and arranged between the first beam 13 and the second beam 14 .

[0178] The first beam 13 is assembled from multiple components and defines multiple cavities. The cavities of the first beam 13 can be referred to as first cavities. Multiple first fixing members 30 are housed within the same first cavity of the first beam 13 and spaced apart along the second direction Y, with the first direction X being perpendicular to the second direction Y. Each first fixing member 30 is welded to the first beam 13.

[0179] The second beam 14 is assembled from multiple components and defines multiple cavities. The cavities of the second beam 14 can be referred to as second cavities. Multiple second fixing members 70 are accommodated within the same second cavity of the second beam 14 and are spaced apart along the second direction Y. Each second fixing member 70 is welded to the second beam 14.

[0180] Multiple restraining members 40 are provided. One end of each restraining member 40 is located on the side of the first beam 13 away from the load-bearing plate 11. A bolt passes through the restraining member 40 and the first beam 13 and is threadedly connected to the first fixing member 30. The other end of each restraining member 40 is located on the side of the second beam 14 away from the load-bearing plate 11. A bolt passes through the restraining member 40 and the second beam 14 and is threadedly connected to the second fixing member 70.

[0181] The present embodiment provides an expansion beam comprising a first beam member 131, a second beam member 132, a third beam member 133, and a first fixing member 30. The first beam member 131 and the second beam member 132 are connected and define a receiving space. At least a portion of the third beam member 133 is disposed within the receiving space, dividing the receiving space into a plurality of cavities 13a. The first fixing member 30 is received in one of the cavities 13a and fixed to the third beam member 133.

[0182] 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: The box body includes a first beam and a second beam arranged opposite to each other along a first direction; a plurality of battery cells housed in the box and arranged between the first beam and the second beam; a first fixing member, at least a portion of which is embedded in the first beam and fixed to the first beam; A restraining member connects the first fixing member and the second beam. 2 . The battery according to claim 1 , further comprising a first connecting member passing through the restraining member and connected to the first fixing member.

3. The battery according to claim 2, wherein The first connecting member includes a bolt.

4. The battery according to any one of claims 1 to 3, comprising a plurality of the first fixing members, the plurality of the first fixing members being spaced apart along a second direction, the second direction intersecting the first direction; The battery includes a plurality of the restraining members arranged along the second direction, and each of the restraining members is connected to at least one of the first fixing members.

5. The battery according to any one of claims 1 to 4, wherein The first beam has a plurality of cavities therein.

6. The battery according to any one of claims 1 to 5, wherein: The first beam has a cavity inside, and the first fixing member is accommodated in the cavity.

7. The battery according to claim 6, wherein The first beam includes a plurality of beam members connected to define a plurality of the cavities.

8. The battery according to claim 7, wherein The plurality of beam members are welded.

9. The battery according to claim 7 or 8, wherein The plurality of beam components include a first beam component, a second beam component and a third beam component. The first beam component and the second beam component are connected and define an accommodation space. At least a portion of the third beam component is disposed in the accommodation space and divides the accommodation space into a plurality of cavities.

10. The battery according to claim 9, wherein The first beam member includes a first wall and a second wall connected to each other, and the second beam member includes a third wall and a fourth wall connected to each other; The first wall and the third wall are spaced apart along the first direction, and the first fixing member is disposed between the first wall and the third wall; In a third direction, the second wall and the fourth wall are stacked between the restraining member and the first fixing member, and the third direction intersects with the first direction; The battery further includes a first connecting member passing through the restraining member, the second wall, and the fourth wall and connected to the first fixing member.

11. The battery according to claim 10, wherein The first wall is arranged on a side of the third wall away from the battery cell; The first wall is provided with a through hole, and the hole wall of the through hole is welded to the first fixing member.

12. The battery according to claim 10 or 11, wherein The third beam component includes a fifth wall, the fifth wall is located on a side of the first fixing member facing away from the fourth wall, and the fifth wall abuts against and is connected to the first fixing member.

13. The battery according to any one of claims 9 to 12, wherein: The box body includes a carrying plate, and the battery cells are connected to the carrying plate; The first beam member includes a first wall and a sixth wall connected to each other, and the second beam member includes a third wall and a seventh wall connected to each other; The first wall and the third wall are spaced apart along the first direction, and the first wall is arranged on a side of the third wall away from the battery cell; The seventh wall extends from an end of the third wall close to the carrier plate toward a side away from the battery cell, and the sixth wall extends from an end of the first wall close to the carrier plate toward a side away from the battery cell; The seventh wall is stacked and fixed to the carrying plate, and the sixth wall is located on a side of the seventh wall facing away from the carrying plate and is fixed to the seventh wall.

14. The battery according to claim 13, further comprising a second connecting member connecting the seventh wall and the carrying plate; The sixth wall is provided with an avoidance structure for avoiding the second connecting member.

15. The battery according to any one of claims 1 to 5, wherein: A recess is provided at one end of the first beam along a third direction, wherein the third direction intersects the first direction; At least a portion of the first fixing member is accommodated in the recess.

16. The battery according to claim 15, wherein A portion of the first beam is located between the first fixing member and the battery cell in the first direction.

17. The battery according to claim 15 or 16, wherein The first fixing member is welded to the first beam; and / or The first fixing member includes a fixing body and a flange portion connected to each other, at least a portion of the fixing body is accommodated in the recess, the fixing body is fixed to the restraining member, the flange portion abuts against the end surface of the first beam along the third direction, and the battery also includes a third connecting member, which connects the flange portion and the first beam.

18. The battery according to any one of claims 15 to 17, wherein: The first beam is an integrally formed structure.

19. The battery according to any one of claims 1 to 18, wherein The restraint member is connected to at least two of the battery cells.

20. The battery according to claim 19, wherein The box body includes a carrying plate, the battery cell and the first beam are located on one side of the carrying plate along a third direction, and the third direction is perpendicular to the first direction; The battery cell is provided with an electrode terminal on a side facing away from the carrier plate, and the restraining member is connected to a surface of the battery cell facing away from the carrier plate; In the third direction, the restraint member does not overlap with the electrode terminal.

21. The battery according to any one of claims 1 to 20, further comprising a second fixing member, at least a portion of the second fixing member being embedded in and fixed to the second beam; The restraining member connects the first fixing member and the second fixing member.

22. The battery according to any one of claims 1 to 21, wherein The restraining member is a belt-shaped structure.

23. An electrical device comprising the battery according to any one of claims 1 to 22, wherein the battery is used to provide electrical energy.

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