Battery device and electric device

Abstract

The utility model discloses a battery device and a power utilization device, the battery device comprises a shell and a battery module, the battery module is mounted in the shell, the battery module comprises a battery monomer assembly, an end plate, a connecting piece and a pre-tightening piece, and the battery monomer assembly comprises a plurality of battery monomers which are sequentially arranged along a first direction; the two end plates are arranged on the two sides of the battery cell assembly in the first direction; the connecting piece extends from the outer side of one end plate to the outer side of the other end plate, so that the battery monomer assembly is clamped between the two end plates; the pre-tightening piece is arranged on at least one of the two end plates, the pre-tightening piece is connected with the adjusting piece, the pre-tightening piece comprises an elastic piece, and the elastic piece is used for adjusting the tightness of the adjusting piece. According to the battery device, the binding force of the connecting piece can be adjusted according to the volume change of the battery monomer assembly, so that the battery monomer assembly is well fixed in the use process, the structural stability of the battery monomer assembly can be improved, and the performance and safety of the battery monomer assembly can be ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electronic battery, in particular to a battery device and a power utilization device. BACKGROUND

[0002] In the related art, the battery structure is bound by steel belts. During the charging and discharging process, the battery will expand and shrink. Since the elastic force of the steel belt cannot be adjusted, it cannot adapt to the volume change of the battery, and stress concentration will occur inside the battery module. Long-term effects may cause damage to key components such as battery pole pieces and separators, affecting the normal use of the battery and reducing the overall life of the battery module. Moreover, when the grouping force of the battery module is large, the fixed elastic force of the steel belt may not be enough to provide sufficient restraint force, resulting in loosening and displacement of the battery module during use, affecting the structural stability of the module. When the battery expansion force is large, the steel belt cannot increase the elastic buffer accordingly, which may cause local deformation of the module, damage the connection and arrangement between the batteries, and further affect the performance and safety of the battery module. SUMMARY

[0003] The present application aims to at least solve one of the technical problems existing in the prior art. To this end, one object of the present application is to provide a battery device that can adjust the restraint force of the connecting piece according to the volume change of the battery module, thereby improving the performance and safety of the battery module.

[0004] The battery device according to an embodiment of the present application comprises: a housing and a battery module, the battery module being installed in the housing, the battery module comprising: a battery monomer group, the battery monomer group comprising a plurality of battery monomers arranged in a first direction; end plates, the end plates being provided in two, the two end plates being arranged on both sides of the first direction of the battery monomer group; a connecting piece, the connecting piece extending from the outside of one of the end plates to the outside of the other end plate to clamp the battery monomer group between the two end plates; a pre-tightening piece, the pre-tightening piece being provided on at least one of the two end plates, the pre-tightening piece being connected to the adjusting piece, the pre-tightening piece comprising an elastic piece, the elastic piece being used to adjust the tightness of the adjusting piece.

[0005] In the above example, the pre-tightening piece can better tension the connecting piece, so that the connecting piece can better fix the battery monomer assembly and the two end plates. At the same time, when the battery monomer assembly expands or shrinks during the charging and discharging process, the elastic piece of the pre-tightening piece can adjust the restraint force of the connecting piece, better adapt to the volume change of the battery monomer assembly, reduce the risk of stress concentration inside the battery monomer assembly, thereby improving the structural stability of the battery monomer assembly, avoiding local deformation of the battery monomer assembly, and thus ensuring the performance and safety of the battery monomer assembly.

[0006] In some embodiments of the present application, one end of the elastic member is connected to the connecting member, and the other end is connected to the end plate.

[0007] In the above example, the elastic member is directly connected between the connecting member and the end plate, which is simple in structure, and the tightness of the connecting member can be well adjusted by the elastic force of the elastic member, so that the connecting member can always keep the battery monomer assembly effectively fixed, and prevent the battery monomer assembly from being unstable due to the loose connecting member.

[0008] In some embodiments of the present application, the end plate has a receiving cavity therein, a side wall of the receiving cavity facing the connecting member is a first side wall, the first side wall is provided with a first through hole in communication with the receiving cavity, the pre-tightening member includes an elastic member and an adjusting member, the adjusting member is movably arranged in the first through hole, and one end of the adjusting member abuts against or is connected to the connecting member, the elastic member is arranged in the receiving cavity, the other end of the adjusting member abuts against or is connected to the elastic member, and the elastic member is used to adjust the extension amount of the adjusting member extending out of the first through hole.

[0009] In the above example, the receiving cavity provides a stable installation space for the elastic member, so that the elastic member is not disturbed by external factors, and its performance is stable. The elastic member can flexibly extend and contract in the receiving cavity according to the state change of the battery monomer assembly, and when the battery monomer assembly expands or shrinks, the adjusting member transmits the force to the connecting member, so that the binding force of the connecting member is adjusted in time, the stress concentration phenomenon is effectively avoided, and the service life of the battery monomer assembly is prolonged. At the same time, this structure design makes the whole pre-tightening member compact in layout, does not occupy too much space, and is beneficial to the miniaturization design of the battery device. Moreover, placing the elastic member in the receiving cavity can also play a certain protection role, reduce the damage to the elastic member caused by accidental situations such as collision and extrusion, and improve the reliability and stability of the pre-tightening member and the whole battery device.

[0010] In some embodiments of the present application, the adjusting member includes a bolt and a nut, the connecting member is provided with a through hole, the end of the bolt extends into the receiving cavity through the through hole and the first through hole in sequence, and is threadedly connected with the nut, and the two ends of the elastic member abut against the nut and the first side wall, respectively.

[0011] In the above examples, the threaded connection between the bolt and the nut is tight and easy to adjust. During installation, the pre-tightening degree of the elastic member can be accurately adjusted by rotating the nut to adapt to the needs of battery monomer assemblies of different specifications, ensuring that the connecting member obtains appropriate initial tension. On the other hand, this connection structure is simple and reliable, easy to assemble and disassemble, and is conducive to the production and maintenance of the battery device. At the same time, the elastic member abuts against the nut and the first side wall at both ends, making the force transmission path clear and direct. When the volume of the battery monomer assembly changes, the deformation force of the elastic member can be efficiently transmitted to the connecting member through the adjusting member, further improving the dynamic adaptability and stability of the entire pre-tightening system to the battery monomer assembly.

[0012] In some embodiments of the present application, the adjusting member is provided with a plurality of elastic members, and the plurality of elastic members correspond one-to-one to the plurality of adjusting members, or the elastic member is provided with a plurality of second through holes allowing the bolt to pass through, and the plurality of bolts pass through the plurality of second through holes one-to-one.

[0013] In the above examples, by arranging the adjusting member and the elastic member, the elastic restoring force generated by the elastic member can be effectively transmitted to the connecting member when the volume of the battery monomer assembly changes during charging and discharging, thereby dynamically adjusting the binding force of the connecting member to the battery monomer assembly. This helps to avoid stress concentration inside the battery monomer assembly due to improper binding force, reduces the risk of deformation of the battery monomer assembly, damage to the pole piece and the separator, prolongs the service life of the battery monomer assembly, and ensures the structural stability, performance reliability and safety of the battery device under different working conditions, maintaining the good charging and discharging performance and energy conversion efficiency of the battery monomer assembly.

[0014] In some embodiments of the present application, the connecting member is provided with a plurality of adjusting members, and the plurality of connecting members correspond one-to-one to the plurality of adjusting members.

[0015] In the above examples, when the volume of the battery monomer assembly changes, each connecting member can independently adjust the binding force according to the corresponding elastic member, better adapt to the expansion or contraction of different parts of the module, effectively prevent the deformation or damage of the module caused by uneven local stress, significantly improve the stability and reliability of the overall structure of the battery monomer assembly, and ensure the long-term stable operation and good performance of the battery device.

[0016] In some embodiments of the present application, the plurality of connecting members are arranged at intervals along a second direction, and the second direction is the length direction of the end plate.

[0017] In the above example, the plurality of connecting pieces arranged at intervals along the length direction of the end plate can replace the upper pressing strip and the bottom pressing adhesive limiting film of the battery monomer assembly, optimize the Z-direction constraint of the battery cell to improve the main frequency, effectively constrain the expansion deformation of the battery cell end, ensure the uniformity of the pressing adhesive thickness, and comprehensively improve the safety, reliability, stability and assembly precision of the battery monomer assembly.

[0018] In some embodiments of the present application, the plurality of connecting pieces includes a first connecting piece, a second connecting piece and at least one third connecting piece, the second direction is the length direction of the battery monomer, and the first connecting piece and the second connecting piece are respectively bound on the two side edges of the battery monomer in the second direction, and the third connecting piece is bound between the first connecting piece and the second connecting piece.

[0019] In the above example, the first connecting piece and the second connecting piece are located on the two side edges in the length direction of the battery monomer, which can directly and effectively fix the edges of the battery monomer, constrain the lateral displacement and expansion deformation of the battery monomer during charging and discharging, and ensure the neatness and stability of the arrangement of the battery monomer. The at least one third connecting piece arranged between the two can further share the binding pressure of the whole and precisely control the middle region of the battery monomer. When the battery monomer expands or shrinks in the length direction, the third connecting piece cooperates with the first connecting piece and the second connecting piece to uniformly disperse the stress according to the elastic adjustment of the pre-tightening piece, thereby avoiding excessive local stress. This not only reduces the risk of damage to the battery monomer due to uneven strain and prolongs the service life of the battery monomer, but also improves the structural strength and reliability of the entire battery monomer assembly, ensuring that the battery device can stably operate under various working conditions and maintain good performance.

[0020] In some embodiments of the present application, the side wall of the accommodating cavity away from the connecting piece is a second side wall, and the second side wall is provided with a recessed groove opposite the bolt.

[0021] In the above example, during the operation of the battery device, especially when the pre-tightening piece and the adjusting piece act due to the volume change of the battery monomer assembly, the bolt can produce a certain displacement or swing. The recessed groove provides space for the movement of the bolt, avoids collision or friction between the bolt and the second side wall of the accommodating cavity, prevents damage of the components caused by mechanical interference, ensures that the pre-tightening piece and the adjusting piece can smoothly play their elastic adjustment and force transmission functions, thereby ensuring the stability and reliability of the entire battery device, prolonging its service life and reducing the risk of failure.

[0022] In some embodiments of the present application, the elastic piece includes a spring sheet.

[0023] In the above examples, the elastic sheet has good elastic deformation capability and can quickly and sensitively generate corresponding elastic restoring force when the volume of the battery monomer assembly changes. Compared with other elastic structures, the elastic sheet has small volume and compact structure, which is conducive to layout in the limited accommodating cavity and realizes the miniaturization design of the battery device. The stress uniformity is good, which can stably transmit the force to the connecting piece through the adjusting piece, effectively adjust the binding force of the connecting piece, reduce the stress concentration inside the battery monomer assembly, and protect the structural integrity and performance stability of the battery monomer assembly.

[0024] In some embodiments of the present application, the elastic sheet is bent on both sides of the third direction towards the first side wall to form a concave structure with an opening facing the first side wall.

[0025] In the above examples, the concave structure design of the elastic sheet can enhance the elastic stability and deformation predictability, increase the contact area, make the force distribution more uniform, effectively protect the battery monomer assembly, and prolong its service life.

[0026] In some embodiments of the present application, the end plate further has two avoiding cavities, which are arranged on both sides of the third direction of the accommodating cavity and communicate with the accommodating cavity, and are used for allowing the deformed elastic sheet to extend into.

[0027] In the above examples, when the battery monomer assembly has a large volume change during charging and discharging, the elastic sheet will deform greatly. The avoiding cavity provides space for the deformed elastic sheet to extend, avoiding the elastic sheet being squeezed or hindered due to lack of space, ensuring that the elastic sheet can freely deform and thus continuously and stably play its elastic adjusting function. This helps to maintain the balanced transmission of force between the pre-tightening piece and the connecting piece, ensuring that the battery monomer assembly can obtain appropriate binding force under different working conditions, and improving the reliability and durability of the overall battery device.

[0028] In some embodiments of the present application, the accommodating cavity extends along the second direction and has an opening on at least one side of the end plate in the second direction, which communicates with the accommodating cavity, wherein the first direction and the second direction are perpendicular.

[0029] In the above examples, the opening is arranged to facilitate the installation and maintenance of the elastic piece. During assembly, the elastic piece can be easily placed into the accommodating cavity and connected, reducing the assembly difficulty and cost. When the elastic piece fails or needs to be replaced, it can also be conveniently taken out or repaired through the opening. At the same time, the accommodating cavity extending along the second direction is compatible with the layout of the connecting piece, which can work better in cooperation, so that the pre-tightening force is uniformly distributed in the corresponding area of the battery monomer assembly, enhancing the restraint effect on the battery monomer assembly and improving the overall stability.

[0030] In some embodiments of the present application, a plurality of the connecting members are provided, and the plurality of the connecting members are spaced apart in the second direction, and each of the connecting members is connected with at least one of the pre-tightening members.

[0031] In the above examples, each of the connecting members can be independently adjusted by the pre-tightening members to bind the battery monomer assembly, and can accurately adapt to the volume change of different parts of the battery monomer assembly during charging and discharging. Whether it is a local slight expansion or a whole expansion, it can effectively disperse stress and avoid damage to the battery monomer assembly caused by stress concentration, significantly enhance the structural stability of the battery monomer assembly, improve the safety and reliability of the battery device, and ensure efficient and stable operation.

[0032] In some embodiments of the present application, the connecting member is annular and surrounds the outside of the battery monomer assembly and the two end plates, or the connecting member is long strip-shaped, and when the connecting member is tied on the outside of the battery monomer assembly and the two end plates, the two ends of the connecting member overlap, and the two ends of the connecting member are fixedly connected with the end plates by one pre-tightening member, or the connecting member is long strip-shaped, and when the connecting member is tied on the outside of the battery monomer assembly and the two end plates, the two ends of the connecting member are spaced apart and fixedly connected with the end plates, respectively, wherein at least one of the two ends of the connecting member is fixedly connected with the end plate by the pre-tightening member.

[0033] In the above examples, the connecting member is connected in these ways, and the pre-tightening force can be accurately adjusted by the pre-tightening member to effectively cope with the volume change of the battery monomer assembly, avoid uneven stress, strengthen the binding effect, and improve the stability and reliability of the battery device.

[0034] In some embodiments of the present application, the side surface of the end plate facing the connecting member is provided with a recess, and the pre-tightening member is arranged in the recess and is adapted to press the connecting member towards the recess.

[0035] In the above examples, the end plate is provided with a recess, the pre-tightening member is arranged in the recess to press the connecting member, and the recess provides a storage space for the connecting member. In the case of expansion of the battery monomer assembly or the like, the bent connecting member in the recess can be stretched. This structure design makes the adjustment range of the pre-tightening force larger and more flexible, can better adapt to the volume change of the battery monomer assembly, effectively disperses stress, ensures the structural stability of the battery monomer assembly, reduces the performance degradation or safety hazards caused by improper pre-tightening force, and improves the overall reliability and safety of the battery device.

[0036] In some embodiments of the present application, the recess is a groove, or the end plate is provided with at least two protrusions, and the two protrusions are spaced apart in the length direction of the connecting member to form the recess between the two adjacent protrusions.

[0037] In the above examples, the recess structure in the form of a groove is simple, easy to manufacture, and can effectively accommodate the connecting piece and assist the pre-tightening piece. The recess formed by the protrusion can enhance the strength of the end plate structure while providing a stable positioning space for the connecting piece, so that the connecting piece is not easily offset during the pre-tightening process. Both forms help the pre-tightening piece to better compress the connecting piece, evenly distribute the pre-tightening force, reduce uneven stress on the battery monomer assembly, improve the reliability and stability of the battery device, and ensure efficient operation.

[0038] In some embodiments of the present application, the recess is a long strip extending in a second direction, and a plurality of connecting pieces are arranged at intervals in the second direction, each of the connecting pieces being compressed in the recess by the pre-tightening piece.

[0039] In the above examples, multiple connecting pieces can constrain the battery monomer assembly from multiple positions, and in combination with the pre-tightening piece, the pre-tightening force can be flexibly adjusted according to the expansion or contraction difference of each part of the battery monomer assembly, achieving precise and uniform force transmission, effectively reducing the risk of stress concentration inside the battery monomer assembly, enhancing the overall structural stability, ensuring reliable operation of the battery device and prolonging the service life. The long strip-shaped recess provides a good bending basis for the connecting piece, so that the pre-tightening force of the connecting piece can be more flexibly adjusted.

[0040] In some embodiments of the present application, a limiting portion is provided on the end plate for limiting the connecting piece.

[0041] In the above examples, the limiting portion can limit the position of the connecting piece, prevent the connecting piece from shifting or sliding during the operation of the battery monomer assembly, and ensure that the connecting piece is always in a good constraint state. It can help to maintain a stable binding force on the battery monomer assembly and effectively resist the expansion force and vibration caused by battery charging and discharging. At the same time, it reduces problems such as friction and misalignment between battery monomers caused by loose connecting pieces, improves the safety and reliability of the battery monomer assembly, and thus ensures the stable operation and service life of the entire battery device.

[0042] In some embodiments of the present application, the limiting portion is a limiting groove.

[0043] In the above examples, the limiting groove can provide accurate and stable guidance and positioning for the connecting piece, so that the connecting piece is tightly embedded after installation, effectively avoiding horizontal or vertical displacement caused by external interference. When the battery monomer assembly undergoes repeated charging and discharging cycles, the limiting groove can limit the excessive deformation of the connecting piece, ensure uniform stress, and thus maintain reliable constraint on the battery monomer assembly, reduce the risk of battery monomer loosening, enhance the stability and safety of the overall structure of the battery device, and prolong its service life.

[0044] In some embodiments of the present application, the battery device further comprises a first glue layer, which is arranged between the connecting member and the battery monomer assembly.

[0045] In the above examples, on the one hand, the first glue layer can enhance the connection strength between the connecting member and the battery monomer assembly, so that the connecting member can more stably fix the battery monomer assembly, and reduce the possibility of loosening of the connecting member due to vibration or volume change of the battery. On the other hand, the first glue layer can play a buffering role, effectively dispersing stress when the battery monomer assembly expands or shrinks, avoiding local stress concentration to cause damage to the battery monomer assembly, thereby improving the stability, safety and overall reliability of the battery device, prolonging the service life of the battery monomer assembly and ensuring its performance stability.

[0046] In some embodiments of the present application, the connecting member is a metal strip integrally formed of a metal material.

[0047] In the above examples, the integral forming process makes the metal strip have high structural integrity. The metal material endows the connecting member with high strength and good toughness, which can effectively withstand the expansion force and impact force generated by the battery monomer assembly during charging and discharging, reliably constrain the battery monomer assembly, and prevent it from deforming or displacing. Its excellent thermal conductivity can also assist the battery monomer assembly in dissipating heat, ensuring that the battery device can stably, safely and efficiently operate under various working conditions, and prolonging the service life.

[0048] The present application provides a power consuming device comprising the battery device of the above embodiments.

[0049] In the above technical solution, by arranging the above battery device, the battery device has good structural stability, which can ensure the performance and safety of the battery device, so that the power consuming device with the battery device has good performance and safety.

[0050] Additional aspects and advantages of the present application will be in part apparent and in part pointed out hereinafter. BRIEF DESCRIPTION OF DRAWINGS

[0051] The above and / or additional aspects and advantages of the present application will become apparent and be readily appreciated from the following description, including the appended drawings.

[0052] Figure 1 is an isometric view of a battery device according to some embodiments of the present application.

[0053] Figure 2 is a front view of a battery device according to some embodiments of the present application.

[0054] Figure 3 is Figure 2 is a sectional view along line A-A in FIG.

[0055] Figure 4 is Figure 3 is an enlarged view of the B region in FIG.

[0056] Figure 5 is Figure 2 is a sectional view along line C-C in FIG.

[0057] Figure 6 is Figure 5 is an enlarged view of the D region in FIG.

[0058] Figure 7 is a top view of a battery device according to some embodiments of the present application.

[0059] Figure 8 is Figure 7 is a sectional view along line E-E in FIG.

[0060] Figure 9 is Figure 8 is an enlarged view of the F region in FIG.

[0061] Figure 10 is a structural schematic view of an electric device according to some embodiments of the present application.

[0062] Reference Signs:

[0063] 1000, electric device; 100, battery device; 200, vehicle body;

[0064] 1, battery module; 10, battery cell assembly; 11, battery cell;

[0065] 2, end plate; 21, accommodating cavity; 211, opening; 22, first side wall; 221, first through hole; 23, second side wall; 231, avoiding groove; 24, avoiding cavity; 25, recess;

[0066] 3, connecting piece; 31, first connecting piece; 32, second connecting piece; 33, third connecting piece; 34, via hole;

[0067] 4, pre-tightening piece; 41, elastic piece; 411, second through hole; 42, adjusting piece; 421, bolt; 422, nut;

[0068] 5, second glue coating layer.

[0069] X, first direction; Y, second direction; Z, third direction. DETAILED DESCRIPTION

[0070] In order to make the objects, 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 described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0071] Unless otherwise defined, all technical and scientific terms used in the present application have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs; the terms used in the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "include" and "have" and any variations thereof in the specification and claims of the present application and the above description of drawings are intended to cover non-exclusive inclusion. The terms "first", "second" and the like in the specification and claims of the present application and the above description of drawings are used to distinguish different objects, not to describe a particular order or primary and secondary relationship.

[0072] In the present application, the phrase "embodiments" means that the 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 at various places in the specification does not necessarily all refer to the same embodiments, nor are they necessarily mutually exclusive or alternative embodiments to each other.

[0073] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mount", "connect", "connect", "attach" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0074] In the present application, the term "and / or" is only a description of the association relationship between the associated objects, which means that there can be three kinds of relationships, for example, A and / or B can represent the existence of A alone, the existence of A and B together, and the existence of B alone. In addition, the character " / " in the present application generally represents that the front and rear associated objects have an "or" relationship.

[0075] In the embodiments of the present application, the same reference signs represent the same parts, and for the sake of brevity, detailed description of the same parts is omitted in different embodiments. It should be understood that the thickness, length and width of various components in the embodiments of the present application shown in the drawings, and the overall thickness, length and width of the integrated device are only exemplary and should not constitute any limitation on the present application.

[0076] "plurality" appearing in the present application refers to two or more (including two).

[0077] In the embodiments of the present application, all the embodiments and optional embodiments of the present application can be combined with each other to form new technical solutions if no special instructions are given.

[0078] In the embodiments of the present application, all the technical features and optional technical features of the present application can be combined with each other to form new technical solutions if no special instructions are given.

[0079] In the embodiments of the present application, the battery apparatus can include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly can include a plurality of battery cells connected in series, in parallel, or in a mixed connection through a busbar component. For example, the battery cell assembly is usually formed by arranging a plurality of battery cells; the battery cell assembly can be a battery module formed by arranging and fixing a plurality of battery cells into an independent module. As an example, the battery module can be formed by bundling a plurality of battery cells with a cable tie.

[0080] In the embodiments of the present application, the battery cell can be a secondary battery, which refers to a battery cell that can be activated by charging after discharging; the battery cell can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel-hydrogen battery, a nickel-cadmium battery, a lead-acid battery, etc., which are not limited in the embodiments of the present application. The battery cell can be a flat body, a cuboid, etc.

[0081] The battery apparatus can be a battery pack including a box body and one or more battery cell assemblies accommodated in the box body. The battery cell assembly can be a battery module, which can be accommodated in the box body by fixing the battery module in the box body; the battery cell assembly can also be accommodated in the box body by directly fixing a plurality of battery cells in the box body.

[0082] In the embodiments of the present application, the box body can include a first box body and a second box body. The first box body and the second box body are buckled to form a closed space inside the box body to accommodate the battery cell assembly. Here, closed means covered or closed, which can be sealed or unsealed. The first box body can be a top cover or a bottom plate. For example, the box body can include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are respectively connected with the frame, so that a closed space is formed inside the box body to accommodate the battery cell assembly.

[0083] In embodiments of the present application, the box can be part of the chassis structure of the vehicle. For example, parts of the box can become at least part of the floor of the vehicle, or parts of the box can become at least part of the cross beams and longitudinal beams of the vehicle.

[0084] The technical solutions described in the embodiments of the present application are applicable to various battery monomer using electric devices, such as mobile phones, portable devices, notebook computers, electric vehicles, electric toys, electric tools, vehicles, ships and spacecraft, etc., for example, spacecraft including airplanes, rockets, space shuttles and spaceships, etc.

[0085] At present, from the development of market situation, the application of battery is more and more widely. The battery is not only applied to the energy storage power supply system of hydropower, thermal power, wind power and solar power station, but also widely used in electric bicycles, electric motorcycles, electric vehicles and other electric vehicles, as well as military equipment, aerospace and other fields. With the continuous expansion of the application field of power battery, the market demand is also increasing.

[0086] In the related art, the battery structure is bound by steel belt. The battery will expand and shrink during charging and discharging. Because the elastic force of the steel belt cannot be adjusted, it cannot adapt to the volume change of the battery, and stress concentration will be generated inside the battery module. Long-term effect may cause damage to the key components such as battery pole piece and diaphragm, affect the normal use of the battery, and reduce the overall life of the battery module. Moreover, when the grouping force of the battery module is large, the fixed elastic force of the steel belt may not be enough to provide sufficient restraint force, resulting in loose, displacement and other situations of the battery module during use, affecting the structural stability of the module. When the battery expansion force is large, the steel belt cannot increase the elastic buffer accordingly, which may cause local deformation of the module, damage the connection and arrangement between the batteries, and further affect the performance and safety of the battery module.

[0087] Therefore, the present application provides a battery device 100. The pre-tightening piece 4 can better tension the connecting piece 3, so that the connecting piece 3 can better fix the battery monomer assembly 10 and the two end plates 2. At the same time, when the battery monomer assembly 10 expands or shrinks during charging and discharging, the elastic piece 41 of the pre-tightening piece 4 can adjust the restraint force of the connecting piece 3, which can better adapt to the volume change of the battery monomer assembly 10, reduce the risk of stress concentration inside the battery monomer assembly 10, thereby improving the structural stability of the battery monomer assembly 10, avoiding local deformation of the battery monomer assembly 10, and ensuring the performance and safety of the battery monomer assembly 10.

[0088] Please refer to Figure 1 , Figure 1 is the isometric view of the battery device 100 according to some embodiments of the present application.

[0089] Please refer to Figure 2 , Figure 2 is a front view of a battery device 100 according to some embodiments of the present application.

[0090] Please refer to Figure 3 , Figure 3 is Figure 2 is a sectional view along line A-A in

[0091] Please refer to Figure 4 , Figure 4 is Figure 3 is an enlarged view of region B in

[0092] The battery device 100 according to embodiments of the present application comprises a housing and a battery module 1 installed in the housing, the battery module 1 comprising a battery monomer assembly 10, end plates 2, a connecting piece 3 and a pre-tightening piece 4, the battery monomer assembly 10 comprising a plurality of battery monomers 11 arranged in a first direction X, two end plates 2 arranged on both sides of the battery monomer assembly 10 in the first direction X, the connecting piece 3 extending from the outer side of one end plate 2 to the outer side of the other end plate 2 to sandwich the battery monomer assembly 10 between the two end plates 2, and the pre-tightening piece 4 arranged on at least one of the two end plates 2, the pre-tightening piece 4 being connected to the connecting piece 3, the pre-tightening piece 4 comprising an elastic piece 41 for adjusting the tightness of the connecting piece 3.

[0093] That is, the two end plates 2 are respectively located on both sides of the battery monomer assembly 10 in the first direction X, and the battery monomer assembly 10 is sandwiched therebetween, the connecting piece 3 can be annular as shown in Figure 1 , the connecting piece 3 is wrapped around the outer sides of the battery monomer assembly 10 and the two end plates 2 to play a role of preliminary fixation. In the initial state, the pre-tightening piece 4 tightens the connecting piece 3. In this way, the connecting piece 3 can bind the battery monomer assembly 10 through the end plates 2 with appropriate force, ensuring the relative positions between the components of the battery monomer assembly 10 stable and preventing them from loosening or shifting.

[0094] When the battery monomer assembly 10 expands during charging and discharging, the outward expanding force will be transmitted to the connecting piece 3. At this time, the elastic piece 41 of the pre-tightening piece 4 will adaptively deform according to the force condition, increasing the binding space of the connecting piece 3 within a certain range, thereby buffering the expansion force of the battery monomer assembly 10 and avoiding stress concentration inside the battery monomer assembly 10 due to excessive binding. When the battery monomer assembly 10 shrinks, the elastic piece 41 of the pre-tightening piece 4 can also appropriately tighten the connecting piece 3 using the elastic restoring force, so that the connecting piece 3 always maintains effective fixation of the battery monomer assembly 10, preventing the battery monomer assembly 10 from being unstable due to the connecting piece 3 being too loose.

[0095] Through the elastic adjustment mechanism, the pre-tightening member 4 cooperates with the connecting member 3, which not only effectively responds to the volume change of the battery monomer assembly 10 during use, reduces the risk of damage to the internal structure, but also always maintains the structural integrity of the battery monomer assembly 10, guarantees the stable performance output of the battery monomer assembly 10 under different working conditions, and better improves the safety and reliability of the battery monomer assembly 10, which is beneficial to the efficient and durable operation of the battery device 100.

[0096] For example, the pre-tightening member 4 and the connecting member 3 can be fixedly connected on both end plates 2, and at least one pre-tightening member 4 can be arranged on each end plate 2.

[0097] For example, the pre-tightening member 4 and the connecting member 3 are fixedly connected on only one end plate 2, and at least one pre-tightening member 4 can be arranged on the end plate 2.

[0098] In the above examples, the pre-tightening member 4 can better tension the connecting member 3, so that the connecting member 3 can better fix the battery monomer assembly 10 and the two end plates 2. At the same time, when the battery monomer assembly 10 expands or shrinks during charging and discharging, the elastic member 41 of the pre-tightening member 4 can adjust the binding force of the connecting member 3, which can better adapt to the volume change of the battery monomer assembly 10, reduce the risk of stress concentration in the battery monomer assembly 10, thereby improving the structural stability of the battery monomer assembly 10, avoiding local deformation of the battery monomer assembly 10, and thus ensuring the performance and safety of the battery monomer assembly 10.

[0099] In some embodiments of the present application, one end of the elastic member 41 is connected with the connecting member 3, and the other end is connected with the end plate 2, that is, the elastic member 41 is directly connected between the connecting member 3 and the end plate 2, and the elasticity of the elastic member 41 can better adjust the tightness of the connecting member 3. When the battery monomer assembly 10 expands during charging and discharging, the outward expansion force will be transmitted to the connecting member 3. At this time, the elastic member 41 will adaptively deform according to the stress condition, and increase the binding space of the connecting member 3 within a certain range, thereby buffering the expansion force of the battery monomer assembly 10 and avoiding stress concentration in the battery monomer assembly 10 due to excessive binding. When the battery monomer assembly 10 shrinks, the elastic member 41 can also use the elastic restoring force to appropriately tighten the connecting member 3, so that the connecting member 3 always maintains effective fixation of the battery monomer assembly 10, preventing the battery monomer assembly 10 from being unstable due to the connecting member 3 being too loose. Moreover, the elastic member 41 is directly connected between the connecting member 3 and the end plate 2, which is simple in structure.

[0100] For example, the two ends of the elastic member 41 can be connected with the connecting member 3 and the end plate 2 respectively by welding, screwing or the like, which is not limited in the present application.

[0101] In the above example, the elastic member 41 is directly connected between the connecting member 3 and the end plate 2, which is simple in structure and can better adjust the tightness of the connecting member 3 through the elastic force of the elastic member 41, so that the connecting member 3 can always be effectively fixed to the battery monomer assembly 10 and prevent the battery monomer assembly 10 from being unstable due to the over-looseness of the connecting member 3.

[0102] In some embodiments of the present application, please refer to Figure 4 , the end plate 2 has a receiving cavity 21 therein, a side wall of the receiving cavity 21 towards the connecting member 3 is a first side wall 22, the first side wall 22 is provided with a first through hole 221 in communication with the receiving cavity 21, the pre-tightening member 4 includes an elastic member 41 and an adjusting member 42, the adjusting member 42 is movably arranged in the first through hole 221 and one end thereof abuts against or is connected to the connecting member 3, the elastic member 41 is arranged in the receiving cavity 21, the other end of the adjusting member 42 abuts against or is connected to the elastic member 41, and the elastic member 41 is used to adjust the extension amount of the adjusting member 42 extending out of the first through hole 221.

[0103] For the abutment described above, please refer to Figure 4 , the head of the bolt 421 presses against the connecting member 3; for the connection, the adjusting member 42 can be welded to the connecting member 3, or can be riveted, etc., which is not limited in the present application, and the abutment between the adjusting member 42 and the elastic member 41 can also be the same as that shown in Figure 4 , or can be welded, riveted, etc.

[0104] In the above example, the receiving cavity 21 provides a stable mounting space for the elastic member 41, so that the elastic member 41 is not disturbed by external factors and its performance is stable. The elastic member 41 can flexibly extend and contract in the receiving cavity 21 according to the state change of the battery monomer assembly 10, and when the battery monomer assembly 10 expands or shrinks, the adjusting member 42 transmits the force to the connecting member 3 to timely adjust the binding force of the connecting member 3, effectively avoids stress concentration phenomenon, and prolongs the service life of the battery monomer assembly 10. At the same time, this structure design makes the whole pre-tightening member 4 compactly arranged without occupying too much space, which is beneficial to the miniaturization design of the battery device 100. Moreover, placing the elastic member 41 in the receiving cavity 21 can also play a certain protection role, reduce the damage to the elastic member 41 caused by accidental situations such as collision and extrusion, and improve the reliability and stability of the pre-tightening member 4 and even the whole battery device 100.

[0105] In some embodiments of the present application, please refer to Figure 4 , the adjusting member 42 includes a bolt 421 and a nut 422, the connecting member 3 is provided with a through hole 34, the end of the bolt 421 extends into the receiving cavity 21 through the through hole 34 and the first through hole 221 in sequence to be threadedly connected to the nut 422, and the two ends of the elastic member 41 abut against the nut 422 and the first side wall 22, respectively.

[0106] In the above examples, the threaded connection between the bolt 421 and the nut 422 is tight and easy to adjust. During installation, the pre-tightening degree of the elastic member 41 can be accurately adjusted by rotating the nut 422 to adapt to the needs of battery monomer assemblies 10 of different specifications, so as to ensure that the connecting member 3 obtains appropriate initial tension. On the other hand, this connection structure is simple and reliable, easy to assemble and disassemble, and is conducive to the production and maintenance of the battery device 100. At the same time, the elastic member 41 abuts against the nut 422 and the first side wall 22 at both ends, so that the force transmission path is clear and direct. When the volume of the battery monomer assembly 10 changes, the deformation force of the elastic member 41 can be efficiently transmitted to the connecting member 3 through the adjusting member 42, further improving the dynamic adaptability and stability of the entire pre-tightening system to the battery monomer assembly 10.

[0107] Please refer to Figure 5 、 Figure 6 , Figure 5 is Figure 2 the cross-sectional view along the line C-C in FIG. 4. Figure 6 is Figure 5 an enlarged view of region D in FIG. 4.

[0108] In some embodiments of the present application, the adjusting member 42 is provided with multiple adjusting members, the elastic member 41 is provided with multiple elastic members, and the multiple elastic members 41 correspond one-to-one to the multiple adjusting members 42. Alternatively, the adjusting member 42 is provided with multiple adjusting members, the elastic member 41 is provided with multiple second through holes 411 allowing the bolt 421 to pass through, and the multiple bolts 421 pass through the multiple second through holes 411 one-to-one.

[0109] For example, if there are three adjusting members 42, there will be three elastic members 41 corresponding to them respectively. Each elastic member 41 is arranged in the corresponding part of the accommodating cavity 21, and the two ends thereof abut against the corresponding nut 422 and the first side wall 22 respectively. When the battery monomer assembly 10 expands or shrinks, each elastic member 41 can independently stretch and deform according to the force borne by the part of the connecting member 3 connected thereto, generate a corresponding elastic restoring force, and transmit the elastic restoring force to the connecting member 3 through the corresponding adjusting member 42. This one-to-one design can make the pre-tightening force more evenly and accurately act on different parts of the battery monomer assembly 10, avoid deformation or damage of the battery monomer assembly 10 caused by uneven local stress, and improve the stability and reliability of the binding of the battery monomer assembly 10. This design is especially suitable for battery monomer assemblies 10 with larger size or more complex structure, and can better adapt to the expansion or shrinkage changes of different regions thereof.

[0110] Exemplarily, the adjusting member 42 is provided with a plurality of second through holes 411 allowing the bolts 421 to pass through, and the elastic member 41 is provided with a plurality of second through holes 411 allowing the bolts 421 to pass through one by one. When the battery monomer assembly 10 changes in volume, the elastic member 41 will deform as a whole, and the elastic restoring force is transmitted to different positions of the connecting member 3 through the plurality of bolts 421 and the adjusting member 42. The advantage of this design is that the number of elastic members 41 is reduced, the structure is simplified, and the production cost and assembly difficulty are reduced. At the same time, since the connection points of the plurality of bolts 421 are distributed on the same elastic member 41, the force cooperation can be ensured to a certain extent, the tension adjustment of the elastic member 41 to the connecting member 3 during deformation is more coordinated and consistent, the pre-tightening force imbalance problem caused by the possible performance difference between the plurality of elastic members 41 is reduced, the stability and consistency of the entire pre-tightening system are improved, and it is suitable for the case that the cost control is relatively strict and the battery monomer assembly 10 has a relatively simple structure and uniform volume change.

[0111] In the above examples, through the arrangement of the adjusting member 42 and the elastic member 41, the elastic restoring force generated by the elastic member 41 can be effectively transmitted to the connecting member 3 when the battery monomer assembly 10 changes in volume during charging and discharging, so as to dynamically adjust the binding force of the connecting member 3 to the battery monomer assembly 10. This helps to avoid stress concentration inside the battery monomer assembly 10 due to improper binding force, reduce the risk of deformation of the battery monomer assembly 10, damage of the pole piece and the diaphragm, prolong the service life of the battery monomer assembly 10, and ensure the structural stability, performance reliability and safety of the battery device 100 under different working conditions, so as to maintain the good charging and discharging performance and energy conversion efficiency of the battery monomer assembly 10.

[0112] In some embodiments of the present application, the connecting member 3 is provided with a plurality of connecting members 3, and the plurality of connecting members 3 and the plurality of adjusting members 42 correspond one by one.

[0113] In the above examples, when the battery monomer assembly 10 changes in volume, each connecting member 3 can independently adjust the binding force according to the expansion and contraction of the corresponding elastic member 41, better adapt to the expansion or contraction of different parts of the module, effectively prevent the deformation or damage of the module caused by uneven stress, significantly improve the stability and reliability of the overall structure of the battery monomer assembly 10, and ensure the long-term stable operation and good performance of the battery device 100.

[0114] Please refer to Figure 1 , Figure 7 , Figure 8 , Figure 9 , Figure 7 is a top view of a battery device according to some embodiments of the present application. Figure 8 is Figure 7 is a sectional view of E-E in Figure 9 isFigure 8 Enlarged view of the middle F region.

[0115] In some embodiments of the present application, the plurality of connectors 3 are arranged at intervals along the second direction Y, which is the length direction of the end plate 2.

[0116] That is, these connectors 3 can effectively replace the upper pressing strip of the original battery monomer assembly 10. By constraining the battery cell Z direction (third direction Z), the tension of the connector 3 can be accurately adjusted, so that the battery cell is more uniformly and stably stressed in the Z direction (third direction Z), thereby improving the main frequency of the battery monomer assembly 10 and optimizing its electrical performance. At the same time, its unique layout can strengthen the constraint on the expansion deformation of the end of the battery cell. During the charging and discharging process of the battery, the end of the battery cell is prone to large expansion force. The plurality of connectors 3 arranged along the length direction of the end plate 2 cooperate with the pre-tightening piece 4, which can dynamically adjust the binding force according to the expansion of the end, effectively prevent the battery monomer assembly 10 from being strained too much, and avoid problems such as rupture of the separator and damage to the pole piece caused by excessive deformation, greatly improving the safety and reliability of the battery monomer assembly 10.

[0117] Further, the arrangement of the present example can also replace the bottom pressing adhesive limiting film of the battery cell. Due to the uniform distribution of the connectors 3 and the reasonable force transmission mechanism, the pressure on the bottom of the battery cell can be uniformly ensured under different working conditions, thereby ensuring the uniformity of the pressing adhesive thickness. This not only helps to maintain the stability of the battery cell in the bottom direction, but also improves the assembly precision and consistency of the entire battery monomer assembly 10, reduces the local stress concentration and electrical performance difference that may be caused by uneven pressing adhesive thickness, and lays a solid foundation for long-term stable operation of the battery device 100.

[0118] For example, a second adhesive layer 5 can be arranged between the bottom of the battery monomer assembly 10 and the battery bottom plate. In the present application, the connectors 3 are tied in the manner shown, so that the distance between the bottom of the battery monomer assembly 10 and the battery bottom plate is relatively constant, so that the second adhesive layer 5 is relatively uniform and has good consistency. Figure 7 、 Figure 8 、 Figure 9 Thus, the distance between the bottom of the battery monomer assembly 10 and the battery bottom plate is relatively constant, so that the second adhesive layer 5 is relatively uniform and has good consistency.

[0119] In the above example, the plurality of connectors 3 arranged at intervals along the length direction of the end plate 2 can replace the upper pressing strip and the bottom pressing adhesive limiting film of the battery monomer assembly 10, optimize the Z direction constraint of the battery cell to improve the main frequency, effectively constrain the expansion deformation of the end of the battery cell, ensure the uniformity of the pressing adhesive thickness, and comprehensively improve the safety, reliability, stability and assembly precision of the battery monomer assembly 10.

[0120] In some embodiments of the present application, please refer to Figure 1The plurality of connecting members 3 includes a first connecting member 31, a second connecting member 32, and at least one third connecting member 33, the second direction Y is the length direction of the battery monomer 11, the first connecting member 31 and the second connecting member 32 are respectively bound on both side edges of the battery monomer 11 in the second direction Y, and the third connecting member 33 is bound between the first connecting member 31 and the second connecting member 32.

[0121] In the above example, the first connecting member 31 and the second connecting member 32 are located on both side edges of the battery monomer 11 in the length direction, which can directly and effectively fix the edges of the battery monomer 11, constrain the lateral displacement and expansion deformation of the battery monomer 11 during charging and discharging, and ensure the neatness and stability of the arrangement of the battery monomer 11. The at least one third connecting member 33 arranged between the first connecting member 31 and the second connecting member 32 can further share the restraint pressure of the whole and precisely control the middle region of the battery monomer 11. When the battery monomer 11 expands or shrinks in the length direction, the third connecting member 33 cooperates with the first connecting member 31 and the second connecting member 32 to uniformly disperse stress according to the elastic adjustment of the pre-tightening member 4, thereby avoiding excessive local stress. This not only reduces the risk of damage to the battery monomer 11 due to uneven strain and prolongs the service life of the battery monomer 11, but also improves the structural strength and reliability of the entire battery monomer assembly 10, thereby ensuring that the battery device 100 can stably operate under various working conditions and maintain good performance.

[0122] In some embodiments of the present application, please refer to Figure 4 and Figure 6 The side wall of the accommodating cavity 21 away from the connecting member 3 is a second side wall 23, and the second side wall 23 is provided with a recess 231 which is opposite to the bolt 421.

[0123] In the above example, during the operation of the battery device 100, especially when the volume change of the battery monomer assembly 10 causes the pre-tightening member 4 and the adjusting member 42 to act, the bolt 421 can produce a certain displacement or swing. The recess 231 provides space for the movement of the bolt 421, avoids the collision or friction between the bolt 421 and the second side wall 23 of the accommodating cavity 21, prevents damage of components caused by mechanical interference, ensures that the pre-tightening member 4 and the adjusting member 42 can smoothly play their elastic adjustment and force transmission functions, thereby ensuring the stability and reliability of the entire battery device 100, prolonging the service life and reducing the risk of failure.

[0124] In some embodiments of the present application, the elastic member 41 includes a spring sheet.

[0125] In the above examples, the elastic sheet has good elastic deformation capability and can quickly and sensitively generate corresponding elastic restoring force when the battery monomer assembly 10 changes in volume. Compared with other elastic structures, the elastic sheet has small volume and compact structure, which is conducive to layout in the limited accommodating cavity 21 and realizes the miniaturization design of the battery device 100. The stress uniformity is good, which can stably transmit the force to the connecting piece 3 through the adjusting piece 42, effectively adjust the binding force of the connecting piece 3, reduce the stress concentration inside the battery monomer assembly 10, and protect the structural integrity and performance stability of the battery monomer assembly 10.

[0126] In some embodiments of the present application, please refer to Figure 6 The elastic sheet is bent on both sides of the third direction Z towards the first side wall 22 to form a concave structure with the opening 211 facing the first side wall 22.

[0127] That is, this shape enables the elastic sheet to deform along a specific bending path when compressed or stretched, enhancing the elastic stability and deformation predictability of the elastic sheet. When the battery monomer assembly 10 changes in volume, it can more accurately generate elastic restoring force and transmit it to the connecting piece 3, effectively dealing with different degrees of expansion and contraction. At the same time, the concave structure increases the contact area with the nut 422 and the first side wall 22, making the force distribution more uniform, reducing local stress concentration, improving the protection effect on the battery monomer assembly 10, and prolonging its service life.

[0128] In the above examples, the concave structure design of the elastic sheet can enhance the elastic stability and deformation predictability, increase the contact area, make the force distribution more uniform, effectively protect the battery monomer assembly 10, and prolong its service life.

[0129] In some embodiments of the present application, please refer to Figure 6 The end plate 2 also has two avoidance cavities 24, which are arranged on both sides of the third direction Z of the accommodating cavity 21 and communicate with the accommodating cavity 21, and the avoidance cavities 24 are used to allow the deformed elastic sheet to extend into.

[0130] In the above examples, when the battery monomer assembly 10 changes in volume during charging and discharging, the elastic sheet will deform by a large amplitude. The avoidance cavity 24 provides space for the deformed elastic sheet to extend, avoiding the elastic sheet from being squeezed or hindered due to lack of space, ensuring that the elastic sheet can freely stretch and deform, thereby continuously and stably exerting its elastic adjusting function. This helps to maintain the balanced transmission of force between the pre-tightening piece 4 and the connecting piece 3, ensuring that the battery monomer assembly 10 can obtain appropriate binding force under different working conditions, and improving the reliability and durability of the battery device 100 as a whole.

[0131] In some embodiments of the present application, the accommodating cavity 21 extends along the second direction Y, and has an opening 211 in communication with the accommodating cavity 21 on at least one side of the second direction Y of the end plate 2, wherein the first direction X and the second direction Y are perpendicular.

[0132] In the above example, the opening 211 facilitates the installation and maintenance of the elastic member 41. During assembly, the elastic member 41 can be easily placed into the accommodating cavity 21 and connected, reducing the difficulty and cost of assembly. When the elastic member 41 fails or needs to be replaced, it can also be conveniently removed or repaired through the opening 211. At the same time, the accommodating cavity 21 extending along the second direction Y is compatible with the layout of the connecting member 3, and can work better in cooperation, so that the pre-tightening force is uniformly distributed in the corresponding area of the battery monomer assembly 10, enhancing the restraint effect on the battery monomer assembly 10 and improving the overall stability.

[0133] In some embodiments of the present application, please refer to Figure 1 , the connecting member 3 is provided with a plurality of connecting members 3, and the plurality of connecting members 3 are spaced apart along the second direction Y, and each connecting member 3 is connected with at least one pre-tightening member 4.

[0134] In the above example, each connecting member 3 can independently adjust the binding force on the battery monomer assembly 10 through the pre-tightening member 4, and can accurately adapt to the volume change of different parts of the battery monomer assembly 10 during charging and discharging. Whether it is a local slight expansion or a whole expansion, it can effectively disperse stress and avoid damage to the battery monomer assembly 10 caused by stress concentration, significantly enhance the structural stability of the battery monomer assembly 10, improve the safety and reliability of the battery device 100, and ensure its efficient and stable operation.

[0135] In some embodiments of the present application, please refer to Figure 1 , the connecting member 3 is annular and surrounds the outside of the battery monomer assembly 10 and the two end plates 2, or the connecting member 3 is long strip-shaped, the connecting member 3 surrounds the outside of the battery monomer assembly 10 and the two end plates 2, the two ends of the connecting member 3 overlap, and exemplarily, the two ends of the connecting member 3 are fixedly connected with the end plate 2 by one pre-tightening member 4.

[0136] In the above example, when the connecting member 3 is annular and surrounds the outside of the battery monomer assembly 10 and the end plate 2, or is long strip-shaped and has two ends overlapping and is fixed by one pre-tightening member 4, the connecting member 3 can uniformly apply force to the entire battery monomer assembly 10 and the end plate 2, effectively constrain the expansion and deformation of the battery monomer assembly 10, enhance the fastening effect of the connecting member 3 on the battery monomer assembly 10, reduce the stress concentration inside the battery monomer assembly 10, improve the stability and safety of the battery device 100, and ensure its reliable operation.

[0137] In some embodiments of the present application, the connecting member 3 is long strip-shaped, and when the connecting member 3 is wrapped around the outside of the battery monomer assembly 10 and the two end plates 2, the two ends of the connecting member 3 are spaced apart and fixedly connected to the same end plate 2 or to the two end plates 2 respectively. For example, at least one of the two ends of the connecting member 3 is connected to the end plate 2 by the pre-tightening member 4. For the convenience of description, the two end plates 2 are referred to as the first end plate and the second end plate respectively.

[0138] For example, one end of the connecting member 3 is fixed to the first end plate, and the other end is wrapped around the battery monomer assembly 10 and the second end plate and then fixed to the first end plate again by the pre-tightening member 4.

[0139] For example, one end of the connecting member 3 is fixed to the first end plate, and the other end is wrapped around the battery monomer assembly 10 and the second end plate and then fixed to the first end plate again by the pre-tightening member 4.

[0140] For example, one end of the connecting member 3 is fixed to the first end plate, and the other end is wrapped around the battery monomer assembly 10 and the second end plate and then fixed to the first end plate again by the pre-tightening member 4.

[0141] For example, one end of the connecting member 3 is fixed to the first end plate, and the other end is wrapped around the battery monomer assembly 10 and the second end plate and then fixed to the first end plate again by the pre-tightening member 4.

[0142] For example, one end of the connecting member 3 is fixed to the first end plate, and the other end is wrapped around the battery monomer assembly 10 and the second end plate and then fixed to the first end plate again by the pre-tightening member 4.

[0143] For example, one end of the connecting member 3 is fixed to the first end plate, and the other end is wrapped around the battery monomer assembly 10 and the second end plate and then fixed to the first end plate again by the pre-tightening member 4.

[0144] For example, one end of the connecting member 3 is fixed to the first end plate, and the other end is wrapped around the battery monomer assembly 10 and the second end plate and then fixed to the first end plate again by the pre-tightening member 4.

[0145] In the above examples, the long strip-shaped connecting member 3 is connected in these ways, and the pre-tightening force can be adjusted by the pre-tightening member 4, which effectively deals with the volume change of the battery monomer assembly 10, avoids uneven stress, strengthens the binding effect, and improves the stability and reliability of the battery device 100.

[0146] In some embodiments of the present application, please refer to Figure 4 The side of the end plate 2 facing the connecting member 3 is provided with a recess 25, and the pre-tightening member 4 is arranged in the recess 25 and is adapted to press the connecting member 3 towards the recess 25.

[0147] In the above examples, the end plate 2 is provided with a recess 25, and the pre-tightening member 4 is in pressure connection with the connecting member 3 in the recess 25. The recess 25 provides a receiving space for the connecting member 3. In the case of expansion of the battery monomer assembly 10 or the like, the connecting member 3 bent in the recess 25 can be stretched. This structure design makes the adjustment range of the pre-tightening force larger and more flexible, better adapts to the volume change of the battery monomer assembly 10, effectively disperses the stress, guarantees the structural stability of the battery monomer assembly 10, reduces the battery performance degradation or safety hazards caused by improper pre-tightening force, and improves the overall reliability and safety of the battery device 100.

[0148] In some embodiments of the present application, the recess 25 is a groove, or the end plate 2 is provided with at least two protrusions, which are spaced apart in the length direction of the connecting member 3 to form a recess 25 between the two adjacent protrusions.

[0149] In the above examples, the recess 25 in the form of a groove has a simple structure, is easy to process and manufacture, and can effectively receive the connecting member 3 and assist the pre-tightening member 4 to work. The recess 25 formed by the protrusion can enhance the structural strength of the end plate 2 while providing a stable positioning space for the connecting member 3, so that the connecting member 3 is not easy to deviate during the pre-tightening process. Both forms can help the pre-tightening member 4 to better press the connecting member 3, uniformly disperse the pre-tightening force, reduce the uneven stress of the battery monomer assembly 10, improve the reliability and stability of the battery device 100, and guarantee its efficient operation.

[0150] In some embodiments of the present application, the recess 25 is a long strip extending along the second direction Y, and the connecting members 3 are spaced apart along the second direction Y. Each connecting member 3 is pressed in the recess 25 by the pre-tightening member 4.

[0151] In the above examples, the plurality of connecting members 3 can constrain the battery monomer assembly 10 from multiple positions, and in combination with the pre-tightening member 4, the pre-tightening force can be flexibly adjusted according to the expansion or contraction difference of each part of the battery monomer assembly 10, to realize precise and uniform force transmission, effectively reduce the risk of stress concentration inside the battery monomer assembly 10, enhance the overall structural stability, guarantee the reliable operation of the battery device 100 and prolong the service life. The long strip-shaped recess 25 provides a good bending basis for the connecting member 3, so that the pre-tightening force of the connecting member 3 can be adjusted more flexibly.

[0152] In some embodiments of the present application, the end plate 2 is provided with a limiting portion for limiting the connecting member 3.

[0153] In the above examples, the limiting part can limit the position of the connecting piece 3, prevent the connecting piece 3 from moving or sliding during the operation of the battery monomer assembly 10, and ensure that the connecting piece 3 is always in a better constraint state. It can help to maintain a stable binding force on the battery monomer assembly 10, effectively resist the expansion force and vibration caused by battery charging and discharging. At the same time, it reduces the problems of friction and misalignment between battery monomers 11 caused by the loosening of the connecting piece 3, improves the safety and reliability of the battery monomer assembly 10, and further ensures the stable operation and service life of the entire battery device 100.

[0154] In some embodiments of the present application, the limiting part is a limiting groove.

[0155] Illustratively, the connecting piece 3 can be fitted in the limiting groove.

[0156] In the above examples, the limiting groove can provide accurate and stable guidance and positioning for the connecting piece 3, so that the connecting piece 3 is tightly embedded therein after installation, effectively avoiding horizontal or vertical displacement caused by external interference. When the battery monomer assembly 10 undergoes repeated charging and discharging cycles, the limiting groove can limit the excessive deformation of the connecting piece 3, ensure uniform stress, and further maintain reliable constraint on the battery monomer assembly 10, reduce the risk of loosening of the battery monomer 11, enhance the stability and safety of the overall structure of the battery device 100, and prolong its service life.

[0157] In some embodiments of the present application, the battery device 100 further comprises a first glue coating layer, which is arranged between the connecting piece 3 and the battery monomer assembly 10.

[0158] In the above examples, on the one hand, the first glue coating layer can enhance the connection strength between the connecting piece 3 and the battery monomer assembly 10, so that the connecting piece 3 can more stably fix the battery monomer assembly 10, and reduce the possibility of loosening of the connecting piece 3 caused by vibration or volume change of the battery. On the other hand, the first glue coating layer can play a buffering role, effectively dispersing stress when the battery monomer assembly 10 expands or shrinks, avoiding local stress concentration from damaging the battery monomer assembly 10, thereby improving the stability, safety and overall reliability of the battery device 100, prolonging the service life of the battery monomer assembly 10 and ensuring its performance stability.

[0159] In some embodiments of the present application, the connecting piece 3 is an integrally formed metal strip.

[0160] In the above examples, the one-piece forming process makes the metal strip structure have high integrity. The metal material endows the connecting piece 3 with high strength and good toughness, can effectively withstand the expansion force and impact force generated by the battery monomer assembly 10 during charging and discharging, reliably constrain the battery monomer assembly 10, and prevent it from deforming or displacing. Its excellent thermal conductivity also helps the battery monomer assembly 10 dissipate heat, ensuring that the battery device 100 can stably, safely and efficiently operate under various working conditions, and prolonging the service life.

[0161] Referring to Figure 10 The application provides a power utilization device 1000 comprising the battery device 100 of the above embodiments.

[0162] In the above technical solution, by arranging the battery device 100, the battery device 100 has good structural stability, which can ensure the performance and safety of the battery device 100, so that the power utilization device 1000 with the battery device 100 has good performance and safety.

[0163] In some embodiments, the power utilization device 1000 is a vehicle, and the longitudinal direction of the vehicle is the first direction X.

[0164] When the battery device 100 is used in a vehicle, the longitudinal direction of the vehicle refers to the arrangement direction of the head and tail of the vehicle body 200, the lateral direction of the vehicle is perpendicular to the longitudinal direction of the vehicle and perpendicular to the up-down direction, the up-down direction can refer to the Z direction in the drawings, the longitudinal direction of the vehicle is the first direction X, and the lateral direction of the vehicle is the second direction Y.

[0165] In the above technical solution, when the battery device 100 is used in a vehicle and the longitudinal direction of the vehicle is the first direction X, the heat exchange assembly of the battery device 100 has high temperature regulation efficiency for the battery monomer 11 assembly, which can improve the safety of the vehicle during driving; and when the length direction of the battery device 100 is arranged along the longitudinal direction of the vehicle, the longitudinal space of the vehicle can be fully utilized, which is beneficial to improve the capacity of the battery device 100.

[0166] The vehicle disclosed in the application can be a new energy vehicle, which can be a pure electric vehicle, a hybrid vehicle or a range-extender vehicle. The vehicle is internally provided with a battery device 100, which can be arranged at the bottom of the vehicle. The battery device 100 can be used for power supply of the vehicle, for example, can be used as a driving power source of the vehicle, instead of or partially instead of fuel or natural gas to provide driving power for the vehicle. The battery device 100 can not only be used as a driving power source of the vehicle, but also be used as an operating power source of the vehicle. The vehicle can further comprise a controller and a motor, the controller being used to control the battery device 100 to supply power to the motor, for example, for the power demand of starting, navigation and driving of the vehicle.

[0167] In the description of the application, reference has been made to descriptive terms such as "one embodiment", "some embodiments", "an embodiment", "example", "specific example" or "some examples" etc. It is emphasized that each of these terms refers to a specific feature, structure, material or characteristic described in connection with a particular embodiment or example. The descriptive terms are not necessarily referring to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples.

[0168] While the embodiments of the application have been shown and described, it is to be understood that the embodiments described are only by way of example and that various changes, modifications, substitutions and alterations can be made thereto without departing from the spirit and scope of the application as set forth in the claims and equivalents thereof.

Claims

1. A battery device (100), characterized by, The application relates to a battery module. The battery module comprises: a battery cell assembly (10) comprising a plurality of battery cells (11) arranged in a first direction (X); end plates (2) arranged on both sides of the battery cell assembly (10) in the first direction (X); a connecting piece (3) extending from the outer side of one end plate (2) to the outer side of the other end plate (2) to sandwich the battery cell assembly (10) between the two end plates (2); a pre-tightening piece (4) arranged on at least one of the end plates (2), connected with the connecting piece (3), and comprising an elastic piece (41) for adjusting the tightness of the connecting piece (3).

2. The battery device (100) according to claim 1, characterized in that One end of the elastic piece (41) is connected with the connecting piece (3), and the other end is connected with the end plate (2).

3. The battery device (100) according to claim 1, characterized in that The end plate (2) has a receiving cavity (21), the side wall of which towards the connecting piece (3) is a first side wall (22) provided with a first through hole (221) in communication with the receiving cavity (21), the pre-tightening piece (4) comprises an elastic piece (41) and an adjusting piece (42), the adjusting piece (42) is movably arranged in the first through hole (221) and one end thereof abuts against or is connected with the connecting piece (3), the elastic piece (41) is arranged in the receiving cavity (21), the other end of the adjusting piece (42) abuts against or is connected with the elastic piece (41), and the elastic piece (41) is used for adjusting the extension amount of the adjusting piece (42) extending out of the first through hole (221).

4. The battery device (100) according to claim 3, characterized in that The adjusting piece (42) comprises a bolt (421) and a nut (422), the connecting piece (3) is provided with a through hole (34), the end of the bolt (421) extends into the receiving cavity (21) through the through hole (34) and the first through hole (221) in sequence to be threadedly connected with the nut (422), and the two ends of the elastic piece (41) abut against the nut (422) and the first side wall (22) respectively.

5. The battery device (100) according to claim 4, characterized in that The adjusting piece (42) is provided with a plurality of adjusting pieces (42), wherein The elastic piece (41) is provided with a plurality of elastic pieces (41) corresponding to the plurality of adjusting pieces (42), or The elastic piece (41) is provided with a plurality of second through holes (411) allowing the bolt (421) to pass through, and the plurality of bolts (421) pass through the plurality of second through holes (411) one by one.

6. The battery device (100) according to claim 5, characterized in that The connecting pieces (3) are provided in plurality, the connecting pieces (3) and the adjusting pieces (42) are one-to-one corresponding, the connecting pieces (3) are arranged at intervals along a second direction (Y), the second direction (Y) is a length direction of the end plate (2), and the first direction (X) and the second direction (Y) are perpendicular.

7. The battery device (100) according to claim 6, characterized in that The connecting pieces (3) include a first connecting piece (31), a second connecting piece (32) and at least one third connecting piece (33), the length direction of the battery monomer (11) is the second direction (Y), the first connecting piece (31) and the second connecting piece (32) are respectively bound on both side edges of the battery monomer (11) in the second direction (Y), and the third connecting piece (33) is bound between the first connecting piece (31) and the second connecting piece (32).

8. The battery device (100) according to claim 4, characterized in that The side wall of the accommodating cavity (21) away from the connecting piece (3) is a second side wall (23), and the second side wall (23) is provided with a avoiding groove (231) opposite to the bolt (421).

9. The battery device (100) according to any one of claims 3-8, characterized in that, The elastic piece (41) includes an elastic sheet, the elastic sheet is bent on both sides in a third direction (Z) to face the first side wall (22), so as to be configured as a concave structure with an opening (211) facing the first side wall (22), and the first direction (X) and the third direction (Z) are perpendicular.

10. The battery device (100) according to claim 9, characterized in that The end plate (2) further has two avoiding cavities (24), the avoiding cavities (24) are arranged on both sides of the accommodating cavity (21) in the third direction (Z) and communicate with the accommodating cavity (21), and the avoiding cavities (24) are used for allowing the deformed elastic sheet to extend into.

11. The battery device (100) according to claim 3, characterized in that The accommodating cavity (21) extends along the second direction (Y) and has an opening (211) on at least one side of the end plate (2) in the second direction (Y) and communicating with the accommodating cavity (21), and the first direction (X) and the second direction (Y) are perpendicular.

12. The battery device (100) according to claim 1, characterized in that The connecting pieces (3) are provided in plurality, the connecting pieces (3) are arranged at intervals along a second direction (Y), and each connecting piece (3) is connected with at least one pre-tightening piece (4), and the first direction (X) and the second direction (Y) are perpendicular.

13. The battery device (100) according to claim 1, characterized in that, the connecting piece (3) is annular and surrounds the outside of the battery monomer assembly (10) and the two end plates (2), or the connecting piece (3) is long strip-shaped, surrounds the outside of the battery monomer assembly (10) and the two end plates (2), and the two ends of the connecting piece (3) overlap, or the connecting piece (3) is long strip-shaped, surrounds the outside of the battery monomer assembly (10) and the two end plates (2), and the two ends of the connecting piece (3) are spaced apart and respectively fixed to the same end plate (2) or the two end plates (2).

14. The battery device (100) according to claim 13, characterized in that When the connecting piece (3) is long strip-shaped, at least one of the two ends of the connecting piece (3) is connected to the end plate (2) through the pre-tightening piece (4).

15. The battery device (100) according to claim 1, characterized in that The end plate (2) is provided with a recess (25) on the side facing the connecting piece (3), the pre-tightening piece (4) is arranged in the recess (25) and is adapted to press the connecting piece (3) towards the recess (25). 16.The battery device (100) according to claim 15, characterized in that, The recess (25) is a groove, or the end plate (2) is provided with at least two protrusions, which are arranged at intervals in the length direction of the connecting piece (3) to form the recess (25) between the two adjacent protrusions.

17. The battery device (100) according to claim 15, characterized in that The recess (25) is a long strip extending along a second direction (Y), and the connecting pieces (3) are arranged at intervals along the second direction (Y), and each connecting piece (3) is pressed by the pre-tightening piece (4) on the recess (25), and the first direction (X) and the second direction (Y) are perpendicular.

18. The battery device (100) according to claim 1, characterized in that The end plate (2) is provided with a limiting portion for limiting the connecting piece (3).

19. The battery device (100) according to claim 18, characterized in that The limiting portion comprises a limiting groove.

20. The battery device (100) according to claim 1, characterized in that Further comprising a first glue layer, which is arranged between the connecting piece (3) and the battery monomer assembly (10).

21. The battery device (100) according to claim 1, characterized in that The connecting piece (3) is a metal strip integrally formed by a metal material.

22. An electrically powered device (1000), characterized in that The battery device (100) according to any one of claims 1-21.

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