Battery and electric device

Abstract

The utility model discloses a battery and an electric device. The battery comprises a box body, a plurality of battery monomers, a first fixing piece and a restraining piece, the box body comprises a first beam and a second beam which are oppositely arranged in the first direction. A plurality of battery cells are housed within the case and disposed between the first beam and the second beam. At least part of the first fixing piece is embedded into the first beam and fixed to the first beam. The restraining piece is connected with the first fixing piece and the second beam. When the battery monomer is expanded, the restraining piece 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 the expansion force is reduced, so that the expansion amount of the battery monomer is limited, and the cycle performance of the battery monomer is improved.

Description

Technical Field

[0001] This application relates to the field of batteries, and particularly to a battery and an electrical device. Background Art

[0002] With the development of battery technology, batteries are applied in more and more fields and gradually replace traditional petrochemical energy in the field of automotive power. A battery can store chemical energy and controllably convert the chemical energy into electrical energy.

[0003] How to improve the reliability of batteries is an important research direction in the industry. Summary of the Utility Model

[0004] This application provides a battery and an electrical device, which can improve the reliability of the battery.

[0005] In a first aspect, this application provides a battery, which includes a box body, a plurality of battery cells, a first fixing member, and a constraining member. The box body includes a first beam and a second beam that are oppositely arranged in a first direction. The plurality of battery cells are accommodated in the box body and arranged between the first beam and the second beam. At least a part of the first fixing member is embedded in the first beam and fixed to the first beam. The constraining member connects the first fixing member and the second beam.

[0006] When the battery cells expand, the constraining member can provide a binding 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 amount of the battery cells and improving the cycling performance of the battery cells. The first fixing member is embedded in the first beam, thereby enhancing the connection strength between the first fixing member and the first beam and reducing the risk of connection failure between the first fixing member and the first beam. The constraining member can be connected to the first beam through the first fixing member, and the connection between the first fixing member and the constraining member is not restricted by the first beam. In this way, the connection method between the first fixing member and the constraining member can be flexibly selected according to needs, improving the connection strength between the first fixing member and the constraining member. By providing the first fixing member, the connection strength between the constraining member and the first beam can be enhanced, reducing the risk of separation between the constraining member and the first beam under the action of the expansion force, improving the performance of the battery cells, and improving the reliability of the battery.

[0007] In some embodiments, the battery further includes a first connecting member, which passes through the constraining member and is connected to the first fixing member. The first connecting member passes through the constraining member and is subjected to a shearing force when the battery cells expand. The first connecting member can withstand a greater expansion force, thereby reducing the risk of connection failure between the constraining member and the first fixing member.

[0008] In some embodiments, the first connecting member includes a bolt. The bolt has high strength and is not easily deformed under the action of the shearing force, thereby maintaining the stable connection between the constraining member and the first fixing member.

[0009] In some embodiments, the battery includes a plurality of first fixing members, the plurality of first fixing members are arranged at intervals in a second direction, and the second direction intersects the first direction. The battery includes a plurality of restraining members arranged in the second direction, and each restraining member is connected to at least one first fixing member. By providing the plurality of restraining members and the plurality of first fixing members, the restraining force applied to the first beam and the second beam can be increased, and the risk of deformation of the first beam and the second beam under the action of the expansion force can be reduced.

[0010] In some embodiments, the first beam has a plurality of cavities inside. By providing the cavities, the weight of the first beam can be reduced, and the energy density of the battery can be improved. The cavity walls of the plurality of cavities can also disperse stress, improve the bending resistance of the first beam, and reduce the risk of the first beam toppling over.

[0011] In some embodiments, the first beam has a cavity inside, and the first fixing member is received in the cavity. By providing the cavity, the first fixing member can be integrally embedded inside the first beam, improving the connection strength between the first fixing member and the first beam.

[0012] In some embodiments, the first beam includes a plurality of beam components, and the plurality of beam components are connected and define a plurality of cavities. The first beam is a splicing structure, and each beam component is independently formed, which can better balance the weight and strength of the first beam. In addition, the first fixing member can be fixed to a certain beam component before the first beam is assembled and formed, thereby reducing the assembly difficulty of the first fixing member.

[0013] In some embodiments, the plurality of beam components are welded. Welding is easy to implement and can improve the connection strength between the beam components.

[0014] In some embodiments, 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 a receiving space, and at least a part of the third beam component is disposed in the receiving space and divides the receiving space into a plurality of cavities. The third beam component can act as a reinforcing rib and can transfer the expansion force between the first beam component and the second beam component. The splicing structure of the first beam component, the second beam component, and the third beam component can improve the structural strength of the first beam and the ability of the first beam to resist the expansion force of the battery cell, thereby improving the reliability of the battery.

[0015] In some embodiments, 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 in a first direction, and a 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 restraint member and the first fixing member, and the third direction intersects the first direction. The battery further includes a first connecting member that passes through the restraint 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 both can restrain the first connecting member, reducing the risk of the first connecting member tilting under the pulling force of the restraint member.

[0016] In some embodiments, the first wall is disposed on a side of the third wall facing 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. By providing the through hole, after the first beam is assembled, the first wall and the first fixing member can be welded from the outside, thereby further improving the connection strength between the first beam and the first fixing member.

[0017] In some embodiments, the third beam member includes a fifth wall that is located on a side of the first fixing member facing away from the fourth wall and abuts against and is connected to the first fixing member. The fifth wall can fix the first fixing member and limit the first fixing member from both sides with the fourth wall, thereby further improving the connection strength between the first fixing member and the first beam.

[0018] In some embodiments, the box body includes a bearing plate, and the battery cell is connected to the bearing 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 in a first direction, and the first wall is disposed on a 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 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 bearing plate toward a side away from the battery cell. The seventh wall is stacked and fixed with the bearing plate, and the sixth wall is located on a side of the seventh wall facing away from the bearing plate and is fixed to the seventh wall. The seventh wall is bent toward a side away from the battery cell relative to the third wall, which can reduce the risk of interference between the seventh wall and the battery cell.

[0019] In some embodiments, the battery further includes a second connecting member that connects the seventh wall and the bearing plate. The sixth wall is provided with an avoidance structure for avoiding the second connecting member. By providing the avoidance structure, the risk of interference between the sixth wall and the second connecting member can be reduced. The second connecting member only needs to connect the seventh wall and the bearing plate and does not need to be connected to the sixth wall, which can reduce the installation difficulty of the second connecting member.

[0020] In some embodiments, one end of the first beam in the third direction is provided with a recess, and the third direction intersects the first direction. At least a part of the first fixing member is received in the recess. By providing the recess on the first beam, it is convenient for the first fixing member to be embedded in the first beam.

[0021] In some embodiments, a part 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 position of the first fixing member in the first direction to reduce the risk of the first fixing member separating from the first beam under the tensile force of the restraint member.

[0022] In some embodiments, the first fixing member is welded to the first beam.

[0023] In some embodiments, the first fixing member includes a fixing main body and a flange portion connected to each other. At least part of the fixing main body is received in the recess, the fixing main body is fixed to the restraint member, the flange portion abuts against the end face of the first beam in the third direction, and the battery further includes a third connecting member connecting the flange portion and the first beam. For positions where there is no welding operation space, the first fixing member can be connected by the third connecting member.

[0024] In some embodiments, the first beam is an integrally formed structure to improve the structural strength of the first beam and reduce the assembly process of the first beam.

[0025] In some embodiments, the restraint member is connected to at least two battery cells. Connecting the restraint member to the battery cells can increase the connection strength between the battery cells and the overall box body, reduce the shaking of the battery cells relative to the box body when the battery is impacted, and improve the stability and reliability of the battery.

[0026] In some embodiments, the box body includes a bearing plate, the battery cells and the first beam are located on one side of the bearing plate in the third direction, and the third direction is perpendicular to the first direction. An electrode terminal is provided on the side of the battery cell facing away from the bearing plate, and the restraint member is connected to the surface of the battery cell facing away from the bearing plate; in the third direction, the restraint member does not overlap with the electrode terminal. The restraint member avoids the electrode terminal, thereby reducing the risk of interference between the restraint member and the bus bar connecting the electrode terminals.

[0027] In some embodiments, the battery further includes a second fixing member, and at least part of the second fixing member 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.

[0028] In some embodiments, the restraint member is a strip structure. Using a strip-structured restraint member can improve the space utilization rate inside the battery and increase the energy density of the battery.

[0029] In a second aspect, the present application provides an electrical device, including the battery provided in any of the embodiments of the first aspect, and the battery is used to provide electrical energy. Description of the Drawings

[0030] The features, advantages, and technical effects of the exemplary embodiments of the present application will be described below with reference to the drawings.

[0031] Figure 1 Schematic structural diagram of a vehicle provided by some embodiments of the present application;

[0032] Figure 2 Schematic structural diagram of a battery provided by some embodiments of the present application;

[0033] Figure 3 is Figure 2 Enlarged schematic diagram at the circular frame;

[0034] Figure 4 is Figure 3 Partial sectional schematic diagram taken along the A-A direction;

[0035] Figure 5 is Figure 4 Enlarged schematic diagram at the circular frame;

[0036] Figure 6 Schematic structural diagram of the first beam of a battery provided by some embodiments of the present application;

[0037] Figure 7 Exploded schematic diagram of a partial structure of a battery provided by some embodiments of the present application;

[0038] Figure 8 is Figure 7 Enlarged schematic diagram at the circular frame;

[0039] Figure 9 Schematic structural diagram of a battery provided by some other embodiments of the present application;

[0040] Figure 10 is Figure 9 Enlarged schematic diagram at the circular frame;

[0041] Figure 11 Partial sectional schematic diagram of a battery provided by some embodiments of the present application.

[0042] Explanation of reference numerals is as follows:

[0043] 1. Vehicle; 2. Battery; 3. Controller; 4. Motor;

[0044] 10. Box body; 11. Bearing plate; 12. Frame; 13. First beam; 131. First beam component; 1311. First wall; 1311a. Through hole; 1312. Second wall; 1313. Sixth wall; 132. Second beam component; 1321. Third wall; 1322. Fourth wall; 1323. Seventh wall; 133. Third beam component; 1331. Fifth wall; 1332. Eighth wall; 1333. Ninth wall; 13a. Cavity; 13b. Recess; 14. Second beam; 15. Third beam;

[0045] 20. Battery cell; 21. Electrode terminal;

[0046] 30. First fixing member; 31. Fixing main body; 32. Flange portion;

[0047] 40. Restraining member; 41. Metal strip; 42. Insulating layer; 50. First connecting member; 51. Head portion; 52. Rod portion; 60. Second connecting member; 70. Second fixing member; 80. Third connecting member;

[0048] S. Avoidance structure; X. First direction; Y. Second direction; Z. Third direction. Detailed implementation manners

[0049] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Apparently, the described embodiments are some, but not all, of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the protection scope of the present application.

[0050] Unless otherwise defined, all technical and scientific terms used in the present application have the same meanings as those commonly understood by those of ordinary skill in the technical field to which the present application belongs; the terms used in the description of the present application in the specification are only for the purpose of describing specific embodiments, and are not intended to limit the present application; the terms "including" and "having" and any variations thereof in the description and claims of the present application and the above drawings are intended to cover non-exclusive inclusion. The terms "first", "second", etc. in the description and claims of the present application or the above drawings are used to distinguish different objects, rather than to describe a specific order or primary-secondary relationship.

[0051] Referring to "embodiments" in the present application means that specific features, structures or characteristics described in connection with the embodiments can be included in at least one embodiment of the present application. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments.

[0052] In the description of the present application, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0053] In this application, the term "and / or" is merely a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. Additionally, in this application, the character " / " generally indicates that the associated objects before and after are in an "or" relationship.

[0054] In the embodiments of this application, the same reference numerals represent the same components. And for the sake of brevity, in different embodiments, the detailed description of the same components is omitted. It should be understood that the thickness, length, width, etc. of various components shown in the drawings in the embodiments of this application, as well as the overall thickness, length, width, etc. of the integrated device, are only for illustrative purposes and should not constitute any limitation to this application.

[0055] In the embodiments of this application, "parallel" includes not only the case of absolute parallelism but also the case of approximately parallelism as conventionally recognized in engineering; at the same time, "perpendicular" also includes not only the case of absolute perpendicularity but also the case of approximately perpendicularity as conventionally recognized in engineering. Exemplarily, if the included angle between two directions is 85° - 90°, the two directions can be considered perpendicular; if the included angle between two directions is 0° - 5°, the two directions can be considered parallel.

[0056] The term "a plurality of" as used in this application refers to two or more (including two).

[0057] The battery mentioned in the embodiments of this application refers to a single physical module that includes one or more battery cells to provide higher voltage and capacity.

[0058] The battery cell can be a secondary battery cell, which refers to a battery cell that can be activated by charging after discharging to continue use.

[0059] The battery cell can be a lithium-ion battery cell, a sodium-ion battery cell, a sodium-lithium-ion battery cell, a lithium-metal battery cell, a sodium-metal battery cell, a lithium-sulfur battery cell, a magnesium-ion battery cell, a nickel-metal hydride battery cell, a nickel-cadmium battery cell, a lead-acid battery cell, etc.

[0060] In some embodiments, the battery can be an energy storage device. Exemplarily, the energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0061] In some embodiments, the battery further includes a box body, and the battery cells are accommodated in the box body. The box body can protect the battery cells from the outside and reduce the risk of battery cell failure.

[0062] In some embodiments, the box body can be part of the chassis structure of a vehicle. For example, part of the box body can become at least part of the floor of the vehicle, or part of the box body can become at least part of the crossbeam and longitudinal beam of the vehicle.

[0063] At present, from the perspective of the development of the market situation, batteries have been widely used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in many fields such as electric tools, drones, and energy storage devices. With the continuous expansion of the fields where batteries are used, the market demand is also continuously increasing.

[0064] During the use of the battery, the battery cell may expand due to charging and discharging or other factors. The free expansion of the battery cell will cause the performance of the battery cell to decline. In order to firmly restrain the battery cell, an expansion beam is usually provided in the box body. The expansion beam can resist the expansion force of the battery cell, limit the expansion amount of the battery cell, slow down the performance decline of the battery cell, and reduce the risk of box body deformation.

[0065] In some embodiments, in order to improve the ability of the expansion beam to resist the expansion force and reduce the 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 the deformation of the expansion beam.

[0066] However, limited by 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 lead to the risk of separation between 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 and affecting the performance of the battery cell and the reliability of the battery.

[0067] In view of this, the present application provides a technical solution, which embeds a fixing member on the beam and uses the fixing member to connect with the restraint, so that the connection method between the fixing member and the restraint is more flexible, improves the connection strength between the beam and the restraint, improves the cycling performance of the battery cell, and improves the reliability of the battery.

[0068] The battery described in the embodiments of the present application is applicable to electrical devices that use batteries.

[0069] The electrical device can be a vehicle, a mobile phone, a portable device, a laptop computer, a ship, a spacecraft, an electric toy, and an electric tool, etc. The vehicle can be a fuel vehicle, a gas vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle, or an extended-range electric vehicle, etc.; the spacecraft includes an airplane, a rocket, a space shuttle, and a spaceship, etc.; the electric toy includes a fixed or mobile electric toy, for example, a game console, an electric vehicle toy, an electric ship toy, and an electric airplane toy, etc.; the electric tool includes a metal cutting electric tool, a grinding electric tool, an assembly electric tool, and a railway electric tool, for example, an electric drill, an electric grinding wheel, an electric wrench, an electric screwdriver, a hammer drill, an impact drill, a concrete vibrator, and a planer, etc. The embodiments of the present application do not make special restrictions on the above electrical devices.

[0070] For the convenience of description, the following embodiments take an electric device as a vehicle as an example for illustration.

[0071] Figure 1 Schematic structural diagram of a vehicle provided in some embodiments of the present application.

[0072] As shown in Figure 1 , a battery 2 is disposed inside the vehicle 1. The battery 2 can be disposed at the bottom, head or tail of the vehicle 1. The battery 2 can be used for power supply of the vehicle 1. For example, the battery 2 can be used as the operating power source of the vehicle 1.

[0073] 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, it is used for the working power requirements during the start, navigation and driving of the vehicle 1.

[0074] In some embodiments of the present application, the battery 2 can not only be used as the operating power source of the vehicle 1, but also be used 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.

[0075] Figure 2 Schematic structural diagram of a battery provided in some embodiments of the present application; Figure 3 is Figure 2 an enlarged schematic diagram at the round frame; Figure 4 is Figure 3 a partial sectional schematic diagram taken along the A-A direction; Figure 5 is Figure 4 an enlarged schematic diagram at the round frame; Figure 6 Schematic structural diagram of the first beam of the battery provided in some embodiments of the present application; Figure 7 Exploded schematic diagram of a partial structure of the battery provided in some embodiments of the present application; Figure 8 is Figure 7 an enlarged schematic diagram at the round frame.

[0076] Referring to Figures 2 to 8 , some embodiments of the present application provide a battery 2, which includes a box body 10 and battery cells 20. The battery cells 20 are accommodated in the box body 10.

[0077] In the battery 2, the number of the battery cells 20 can be one or more. Exemplarily, the number of the battery cells 20 is multiple. The multiple battery cells 20 can be connected in series, in parallel or in a hybrid connection. The hybrid connection means that there are both series and parallel connections among the multiple battery cells 20.

[0078] As an example, the battery cell 20 can be a prismatic battery cell, a soft-pack battery cell or a battery cell with other shapes. The prismatic battery cell includes a square-shell battery cell, a blade-shaped battery cell, a multi-prismatic battery cell, and the multi-prismatic battery cell is, for example, a hexagonal-prismatic battery cell, etc.

[0079] The box body 10 can be of various shapes, such as a cylinder, a cuboid, etc.

[0080] The material of the box body 10 can be steel, aluminum, aluminum alloy or other materials.

[0081] In some embodiments, the box body 10 includes a bearing plate 11 and a frame 12 connected to the bearing plate 11. The frame 12 and the bearing plate 11 enclose an internal space for accommodating the battery cells 20. Exemplarily, the frame 12 is disposed along the periphery of the bearing plate 11 and is fixedly connected to the bearing plate 11.

[0082] In some embodiments, the battery cells 20 are fixed to the bearing plate 11. Exemplarily, the battery cells 20 can be bonded to the bearing plate 11.

[0083] In some embodiments, the box body 10 further includes a cover plate (not shown), the cover plate is disposed opposite to the bearing plate 11, the frame 12 connects the cover plate and the bearing plate 11, and the frame 12, the cover plate and the bearing plate 11 enclose an accommodation cavity of the box body 10, and a plurality of battery cells 20 can be disposed in the accommodation cavity.

[0084] When the battery 2 is installed in the electrical device, the cover plate can be located on the upper side of the bearing plate 11 or on the lower side of the bearing plate 11.

[0085] In some embodiments, the frame 12 includes a plurality of side beams, and the plurality of side beams are disposed along the circumferential direction of the bearing plate 11 and are connected in sequence to form an annular frame body.

[0086] In some embodiments, the battery 2 includes a box body 10, a plurality of battery cells 20, a first fixing member 30 and a restraint member 40. The box body 10 includes a first beam 13 and a second beam 14 disposed opposite to each other along the first direction X. The plurality of battery cells 20 are accommodated in the box body 10 and are arranged between the first beam 13 and the second beam 14. At least a part of the first fixing member 30 is embedded in the first beam 13 and is fixed to the first beam 13. The restraint member 40 connects the first fixing member 30 and the second beam 14.

[0087] Exemplarily, the first beam 13 and the second beam 14 can be used to resist the expansion force of the battery cells 20. The first beam 13 and the second beam 14 can also be referred to as the expansion beams of the box body 10.

[0088] 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.

[0089] The first beam 13 can be an integrally formed component. For example, the first beam 13 can be a profile beam, which is integrally formed by an extrusion process. Alternatively, the first beam 13 can also be formed by splicing a plurality of components. For example, the first beam 13 is formed by welding a plurality of sheet metal parts.

[0090] Exemplarily, multiple battery cells 20 can be arranged in a row or in multiple rows.

[0091] The first fixing member 30 can be integrally embedded into the first beam 13 or only partially embedded into the first beam 13.

[0092] The first fixing member 30 can be one or multiple. Exemplarily, the first fixing member 30 can be multiple, and the multiple first fixing members 30 can have the same structure or different structures.

[0093] The first fixing member 30 can be fixed to the first beam 13 by welding, snap connection, riveting, bolt connection, bonding or other means.

[0094] The restraint member 40 can be one or multiple. One restraint member 40 can be connected to one first fixing member 30 or simultaneously connected to multiple first fixing members 30.

[0095] The restraint member 40 can be connected to the first fixing member 30 by welding, snap connection, fastener connection or other connection means.

[0096] The restraint member 40 is in a strip structure, linear structure, beam structure or other structures. Exemplarily, the restraint member 40 extends along the first direction X.

[0097] When the battery cell 20 expands, the restraint member 40 can provide a binding force to the first beam 13 and the second beam 14, reduce the deformation of the first beam 13 and the second beam 14 under the action of the expansion force, thereby limiting the expansion amount of the battery cell 20 and improving the cycling performance of the battery cell 20. The first fixing member 30 is embedded into 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 connection failure between the first fixing member 30 and the first beam 13. The restraint member 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 member 40 is not restricted by the first beam 13. In this way, the connection method between the first fixing member 30 and the restraint member 40 can be flexibly selected according to needs, and the connection strength between the first fixing member 30 and the restraint member 40 can be improved. By providing the first fixing member 30, the connection strength between the restraint member 40 and the first beam 13 can be enhanced, the risk of separation between the restraint member 40 and the first beam 13 under the action of the expansion force can be reduced, the performance of the battery cell 20 can be improved, and the reliability of the battery 2 can be enhanced.

[0098] In some embodiments, the restraint member 40 can apply a pre-tightening tensile force to the first beam 13 and the second beam 14.

[0099] In some embodiments, both ends of the first beam 13 in the second direction Y are connected to the frame 12 of the box body 10. Both ends of the second beam 14 in the second direction Y are connected to the frame 12 of the box body 10.

[0100] In some embodiments, the restraint 40 is a strip structure. The strip structure has a low cost and occupies a small space; by using the strip-structured restraint 40, the space utilization rate inside the battery 2 can be improved, and the energy density of the battery 2 can be increased.

[0101] Exemplarily, compared with using a restraint having a beam structure, the strip-structured restraint can increase the energy density.

[0102] In some embodiments, the restraint 40 includes a metal strip 41. Exemplarily, the restraint 40 includes a steel strip.

[0103] In some embodiments, the first beam 13 has a cavity 13a inside. The cavity 13a can be one or multiple.

[0104] In some embodiments, the first beam 13 has multiple cavities 13a inside. By providing the cavities 13a, the weight of the first beam 13 can be reduced, and the energy density of the battery 2 can be increased. The cavity walls of the multiple cavities 13a can also disperse stress, improve the bending resistance of the first beam 13, and reduce the risk of the first beam 13 tipping over.

[0105] In some embodiments, the battery 2 further includes a first connecting member 50, and the first connecting member 50 passes through the restraint 40 and is connected to the first fixing member 30.

[0106] When the first connecting member 50 passes through the restraint 40, it is subjected to a shearing force when the battery cell 20 expands. Compared with the scheme of welding the restraint 40 to the first fixing member 30, the first connecting member 50 can withstand a greater expansion force, thereby reducing the risk of the connection between the restraint 40 and the first fixing member 30 failing.

[0107] Exemplarily, the restraint 40 includes a metal strip 41, and the first connecting member 50 passes through the metal strip 41 in the thickness direction of the metal strip 41.

[0108] In some embodiments, the first connecting member 50 includes a fastener. Optionally, the fastener includes a bolt, a screw, a rivet or a pin.

[0109] In some embodiments, the first connecting member 50 includes a bolt. The bolt has high strength and is not easily deformed under the action of a shearing force, thereby maintaining a stable connection between the restraint 40 and the first fixing member 30.

[0110] In some embodiments, the first fixing member 30 has a threaded hole. A part of the first connecting member 50 extends into the threaded hole and is threadedly connected to the first fixing member 30.

[0111] In some embodiments, the battery 2 includes a plurality of first fixing members 30, which are arranged at intervals along the second direction Y, and 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, and each restraining member 40 is connected to at least one first fixing member 30.

[0112] By providing a plurality of restraining members 40 and a plurality of first fixing members 30, the binding 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.

[0113] 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.

[0114] In some embodiments, the number of the restraining members 40 is the same as that of the first fixing members 30, and the plurality of restraining members 40 and the plurality of first fixing members 30 are arranged in one-to-one correspondence.

[0115] In some embodiments, the first beam 13 has a cavity 13a inside, and the first fixing member 30 is received in the cavity 13a. By providing the cavity 13a, the first fixing member 30 can be integrally embedded inside the first beam 13, improving the connection strength between the first fixing member 30 and the first beam 13.

[0116] Exemplarily, the first connecting member 50 includes a bolt, and the bolt passes through the first beam 13 and is threadedly connected to the first fixing member 30. Receiving the first fixing member 30 in the cavity 13a can increase the size of the bolt and the screwed connection length between the bolt and the first fixing member 30, thereby reducing the risk of the bolt tilting and deforming under the action of the shear force.

[0117] In some embodiments, a plurality of first fixing members 30 are received in the same cavity 13a. The plurality of first fixing members 30 are arranged at intervals along the second direction Y in the cavity 13a, which can reduce the overall weight and volume of the plurality of first fixing members 30 and improve the energy density.

[0118] In some embodiments, the first beam 13 includes a plurality of beam members, and the plurality of beam members are connected and define a plurality of cavities 13a.

[0119] The first beam 13 is a splicing structure, and each beam member 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 certain beam member before the first beam 13 is assembled and formed, thereby reducing the assembly difficulty of the first fixing member 30.

[0120] 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.

[0121] In some embodiments, the beam member is a steel sheet metal part.

[0122] In some embodiments, the plurality of beam members include a first beam member 131, a second beam member 132, and a third beam member 133. The first beam member 131 and the second beam member 132 are connected and define an accommodation space. At least a part of the third beam member 133 is disposed in the accommodation space and divides the accommodation space into a plurality of cavities 13a.

[0123] The third beam member 133 can act as a reinforcing rib and can transfer the expansion force between the first beam member 131 and the second beam member 132. The splicing structure of the first beam member 131, the second beam member 132, and the third beam member 133 can improve the structural strength of the first beam 13 and the ability of the first beam 13 to resist the expansion force of the battery cell 20, thereby improving the reliability of the battery 2.

[0124] 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 a first direction X, and a first fixing member 30 is disposed between the first wall 1311 and the third wall 1321.

[0125] When the first fixing member 30 is subjected to the pulling force of the restraint member 40, the first wall 1311 and the third wall 1321 can limit the first fixing member 30 in the first direction X, reducing the risk of relative movement between the first fixing member 30 and the first beam 13 and improving the connection stability between the first fixing member 30 and the first beam 13.

[0126] In some embodiments, the battery 2 further includes a first connecting member 50. The first connecting member 50 passes through the restraint member 40, the second wall 1312, and the fourth wall 1322 and is connected to the first fixing member 30.

[0127] The second wall 1312 and the fourth wall 1322 form a double-layer structure, and both can restrain the first connecting member 50, reducing the risk of the first connecting member 50 tilting under the pulling force of the restraint member 40.

[0128] In some embodiments, the restraint member 40, the second wall 1312, the fourth wall 1322, and the first fixing member 30 are stacked in sequence along a third direction Z. Exemplarily, the first direction X, the second direction Y, and the third direction Z are perpendicular to each other.

[0129] In some embodiments, the first connecting member 50 includes a head 51 and a rod portion 52. The rod portion 52 passes through the restraint member 40, the second wall 1312, and the fourth wall 1322 and is connected to the first fixing member 30. The head 51 and the first fixing member 30 clamp the restraint member 40, the second wall 1312, and the fourth wall 1322.

[0130] 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 is provided with a through hole 1311a, and the hole wall of the through hole 1311a is welded to the first fixing member 30.

[0131] By providing the through hole 1311a, after the first beam 13 is assembled, the first wall 1311 and the first fixing member 30 can be welded from the outside, thereby further improving the connection strength between the first beam 13 and the first fixing member 30.

[0132] 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 facing away from the fourth wall 1322, and the fifth wall 1331 abuts against and is connected to the first fixing member 30.

[0133] The fifth wall 1331 can fix the first fixing member 30 and limit the first fixing member 30 from both sides together with the fourth wall 1322, thereby further improving the connection strength between the first fixing member 30 and the first beam 13.

[0134] In some embodiments, the fifth wall 1331 is inclined with respect 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 toppling over.

[0135] In some embodiments, the fifth wall 1331 is welded to the first fixing member 30.

[0136] In some embodiments, the first wall 1311, the second wall 1312, the third wall 1321, the fourth wall 1322, and the fifth wall 1331 can limit the first fixing member 30 from the outside, thereby reducing the stress on the weld of the first fixing member 30 and reducing the risk of weld cracking.

[0137] In some embodiments, the box body 10 includes a bearing plate 11, and the battery cell 20 is connected to the bearing plate 11. 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 the first direction X, and the first wall 1311 is disposed on a side of the third wall 1321 away from the battery cell 20. The seventh wall 1323 extends from an end of the third wall 1321 close to the bearing plate 11 toward a side away from the battery cell 20, and the sixth wall 1313 extends from an end of the first wall 1311 close to the bearing plate 11 toward a side away from the battery cell 20. The seventh wall 1323 is stacked and fixed with the bearing plate 11, and the sixth wall 1313 is located on a side of the seventh wall 1323 away from the bearing plate 11 and is fixed to the seventh wall 1323.

[0138] 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.

[0139] In some embodiments, the sixth wall 1313 is welded to the seventh wall 1323.

[0140] In some embodiments, the battery 2 further includes a second connecting member 60, and the second connecting member 60 connects the seventh wall 1323 and the bearing plate 11. The sixth wall 1313 is provided with an avoidance structure S for avoiding the second connecting member 60.

[0141] Exemplarily, the avoidance structure S may include a hole, a groove, a notch or other structures.

[0142] By providing the avoidance structure S, the risk of interference between the sixth wall 1313 and the second connecting member 60 can be reduced. The second connecting member 60 only needs to connect the seventh wall 1323 and the bearing plate 11 and does not need to be connected to the sixth wall 1313, which can reduce the installation difficulty of the second connecting member 60.

[0143] In some embodiments, the second connecting member 60 includes a rivet.

[0144] In some embodiments, the avoidance structure S includes an avoidance recess.

[0145] In some embodiments, the third beam member 133 further includes an eighth wall 1332, and at least a part of the eighth wall 1332 is disposed between the sixth wall 1313 and the seventh wall 1323.

[0146] Optionally, the eighth wall 1332 is also provided with an avoidance structure S for avoiding the second connecting member 60, such as an avoidance notch.

[0147] In some embodiments, the eighth wall 1332 is welded to the sixth wall 1313 and the seventh wall 1323.

[0148] 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.

[0149] The plurality of ninth walls 1333 can enhance the stiffness of the first beam 13.

[0150] 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 connection strength between the battery cells 20 and the overall box body 10, reduce the sway of the battery cells 20 relative to the box body 10 when the battery 2 is impacted, and improve the stability and reliability of the battery 2.

[0151] In some embodiments, a 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 the first direction X, and the plurality of battery columns are arranged along the second direction Y.

[0152] In some embodiments, the restraint 40 is connected to the battery cells 20 of two adjacent battery columns.

[0153] In some embodiments, the restraint 40 is bonded to the battery cells 20.

[0154] In some embodiments, the restraint 40 includes a metal strip 41 and an insulating layer 42 covering the outside of the metal strip 41, and the insulating layer 42 is bonded to the battery cells 20.

[0155] In some embodiments, the box body 10 includes a bearing plate 11, and the battery cells 20 and the first beam 13 are located on one side of the bearing plate 11 along the third direction Z, and the third direction Z is perpendicular to the first direction X.

[0156] An electrode terminal 21 is provided on the side of the battery cell 20 facing away from the bearing plate 11. The restraint 40 is connected to the surface of the battery cell 20 facing away from the bearing plate 11. In the third direction Z, the restraint 40 does not overlap with the electrode terminal 21.

[0157] Exemplarily, the electrode terminal 21 is used to lead out the electric energy inside the battery cell 20.

[0158] The restraint 40 avoids the electrode terminal 21, thereby reducing the risk of interference between the restraint 40 and the bus bar connecting the electrode terminal 21.

[0159] In some embodiments, both electrode terminals 21 are provided on the side of the battery cell 20 facing away from the bearing plate 11. One electrode terminal 21 is a positive terminal, and the other electrode terminal 21 is a negative terminal.

[0160] In some embodiments, the battery 2 further includes a second fixing member 70, and at least a part of the second fixing member 70 is embedded in the second beam 14 and fixed to the second beam 14. The restraint member 40 connects the first fixing member 30 and the second fixing member 70.

[0161] The structure of the second fixing member 70 may be the same as or different from the structure of the first fixing member 30.

[0162] In some embodiments, the second fixing member 70 is entirely embedded in the second beam 14.

[0163] In some embodiments, the box body 10 further includes a third beam 15 disposed between the first beam 13 and the second beam 14. A part of the battery cells 20 is arranged between the first beam 13 and the third beam 15, and another part of the battery cells 20 is arranged between the second beam 14 and the third beam 15.

[0164] In some embodiments, the restraint member 40 is also connected to the third beam 15.

[0165] Figure 9 Schematic structural diagram of the battery provided in other embodiments of the present application; Figure 10 is Figure 9 Enlarged schematic diagram at the circular frame; Figure 11 Partial cross-sectional schematic diagram of the battery provided in some embodiments of the present application.

[0166] Referring to Figures 9 to 11 , in some embodiments, one end of the first beam 13 in the third direction Z is provided with a recess 13b, and the third direction Z intersects with the first direction X. At least a part of the first fixing member 30 is received in the recess 13b. By providing the recess 13b on the first beam 13, it is convenient for the first fixing member 30 to be embedded in the first beam 13.

[0167] In some embodiments, a part 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 position of 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 pulling force of the restraint member 40.

[0168] In some embodiments, the first fixing member 30 is welded to the first beam 13.

[0169] In other embodiments, the first fixing member 30 includes a fixing main body 31 and a flange portion 32 connected to each other. At least a part of the fixing main body 31 is received in the recess 13b, the fixing main body 31 is fixed to the restraint member 40, and the flange portion 32 abuts against the end face of the first beam 13 in the third direction Z; the battery 2 further includes a third connecting member 80, and the third connecting member 80 connects the flange portion 32 and the first beam 13.

[0170] For positions without welding operation space, the first fixing member 30 can be connected through a third connecting member 80.

[0171] Exemplarily, if the first beam 13 is relatively 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.

[0172] Exemplarily, the third connecting member 80 includes a rivet.

[0173] In some embodiments, there are multiple first fixing members 30. In some examples, all the first fixing members 30 are welded to the first beam 13. In other examples, all the first fixing members 30 are fixed to the first beam 13 through the third connecting member 80. In still other examples, some of the first fixing members 30 are welded to the first beam 13, and the other part of the first fixing members 30 are fixed to the first beam 13 through the third connecting member 80.

[0174] In some embodiments, the first beam 13 is an integrally formed structure to improve the structural strength of the first beam 13 and reduce the assembly process of the first beam 13.

[0175] In some embodiments, the first beam 13 is a multi-chamber profile structure. The first beam 13 is provided with reinforcing ribs inside to improve its own stiffness.

[0176] In some embodiments, the battery 2 further includes a second fixing member 70, and at least part of the second fixing member 70 is embedded in the second beam 14 and fixed to the second beam 14. The restraint member 40 connects the first fixing member 30 and the second fixing member 70.

[0177] In some embodiments, the second fixing member 70 is riveted to the second beam 14.

[0178] This application also provides an electrical device, including the battery 2 in any of the above embodiments. The battery 2 is used to provide electrical energy for the electrical device. The electrical device can be any of the foregoing devices or systems that apply the battery 2.

[0179] Refer to Figures 2 to 8 , this application embodiment provides a box body 10, multiple battery cells 20, a first fixing member 30, a second fixing member 70, and a restraint member 40.

[0180] The box body 10 includes a bearing plate 11, a first beam 13, and a second beam 14. The first beam 13 and the second beam 14 are arranged on one side of the bearing plate 11 and connected to the bearing plate 11. The first beam 13 and the second beam 14 are arranged opposite to each other along the first direction X.

[0181] Multiple battery cells 20 are accommodated in the box body 10 and arranged between the first beam 13 and the second beam 14.

[0182] The first beam 13 is formed by splicing a plurality of components and defines a plurality of cavities. The cavities of the first beam 13 can be referred to as the first cavities. A plurality of first fixing members 30 are received in the same first cavity of the first beam 13 and are spaced apart along the second direction Y, and the first direction X is perpendicular to the second direction Y. Each first fixing member 30 is welded to the first beam 13.

[0183] The second beam 14 is formed by splicing a plurality of components and defines a plurality of cavities. The cavities of the second beam 14 can be referred to as the second cavities. A plurality of second fixing members 70 are received in 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.

[0184] A plurality of restraint members 40 are provided. One end of the restraint member 40 is located on the side of the first beam 13 away from the bearing plate 11. A bolt passes through the restraint member 40 and the first beam 13 and is threadedly connected to the first fixing member 30. The other end of the restraint member 40 is located on the side of the second beam 14 away from the bearing plate 11. A bolt passes through the restraint member 40 and the second beam 14 and is threadedly connected to the second fixing member 70.

[0185] An embodiment of the present application provides an expansion beam, which includes 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 an accommodation space. At least a part of the third beam member 133 is disposed in the accommodation space and divides the accommodation space into a plurality of cavities 13a. The first fixing member 30 is received in one cavity 13a and fixed to the third beam member 133.

[0186] Although the present application has been described with reference to the preferred embodiments, various improvements can be made to it and components therein can be replaced with equivalents without departing from the scope of the present application. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery, characterized in that: include: The box body comprises a first beam and a second beam which are arranged opposite to each other along a first direction; A plurality of battery cells are contained 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, characterized in that The battery further includes a first connecting member, which passes through the restraining member and is connected to the first fixing member.

3. The battery according to claim 2, characterized in that The first connecting member includes a bolt.

4. The battery according to any one of claims 1 to 3, characterized in that: The battery comprises a plurality of the first fixing members, the plurality of the first fixing members are arranged at intervals along a second direction, and the second direction intersects with 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, characterized in that: The first beam has a plurality of cavities inside.

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

7. The battery according to claim 6, characterized in that The first beam includes a plurality of beam members, and the plurality of beam members are connected and define a plurality of the cavities.

8. The battery according to claim 7, characterized in that The plurality of beam members are welded.

9. The battery according to claim 7 or 8, characterized in that: 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 a receiving space. At least a portion of the third beam component is disposed in the receiving space and divides the receiving space into a plurality of cavities.

10. The battery according to claim 9, characterized in that 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, which passes through the restraining member, the second wall and the fourth wall and is connected to the first fixing member.

11. The battery according to claim 10, characterized in that 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, characterized in that: The third beam component includes a fifth wall, the fifth wall is located on a side of the first fixing member 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, characterized in that: The box body includes a carrying plate, and the battery monomer is 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 one end of the third wall close to the carrier plate toward a side away from the battery cell, and the sixth wall extends from one 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 away from the carrying plate and is fixed to the seventh wall.

14. The battery according to claim 13, characterized in that The battery further comprises a second connecting member, the 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, characterized in that: A concave portion is provided at one end of the first beam along a third direction, and the third direction intersects with the first direction; At least a portion of the first fixing member is accommodated in the recess.

16. The battery according to claim 15, characterized in that 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, characterized in that: 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 an 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, characterized in that: The first beam is an integrally formed structure.

19. The battery according to any one of claims 1 to 18, characterized in that: The restraining member is connected to at least two of the battery cells.

20. The battery according to claim 19, characterized in that The box body includes a bearing plate, the battery cell and the first beam are located on one side of the bearing 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 one side away from the carrier plate, and the restraining member is connected to the surface of the battery cell away from the carrier plate; In the third direction, the restraining member does not overlap with the electrode terminal.

21. The battery according to any one of claims 1 to 20, characterized in that: 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 restraining member connects the first fixing member and the second fixing member.

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

23. An electrical device, characterized in that: Comprising a battery according to any one of claims 1-22, the battery is used to provide electrical energy.

Images