Battery device and electric device

Abstract

The application relates to the battery technical field and provides a battery device and a power utilization device. The battery device comprises a box body, a plurality of battery monomers, an expansion beam and a reinforcing piece. The plurality of battery monomers are arranged in the box body along a first direction. The expansion beam is arranged in the box body and abuts against the battery monomers at the end in the first direction. The reinforcing piece comprises a main body structure and a first limiting structure. The main body structure is connected to the outside of the box body. The first limiting structure is connected with the main body structure. The first limiting structure is arranged in the box body and is limited to the expansion beam to limit the movement of the expansion beam in the first direction away from the battery monomers. The reinforcing piece with the limiting function can effectively constrain the expansion beam and reasonably conduct the expansion force, solves the problem that the expansion beam is easy to fail, improves the overall rigidity and anti-deformation capacity of the box body, and effectively improves the reliability of the battery device.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, and particularly provides a battery device and a power utilization device. BACKGROUND

[0002] The battery device is a device for converting chemical energy into electrical energy, and is widely used in electric vehicles, energy storage systems and other equipment to provide required electrical energy output. However, the expansion beam of the existing battery device has a problem of installation failure in use, resulting in low reliability of the battery device. SUMMARY

[0003] In view of the above technical problems, the embodiments of the present application aim to provide a battery device and a power utilization device, and solve the problem of low reliability caused by the installation failure of the expansion beam of the existing battery device in use.

[0004] To achieve the above-mentioned purpose, the technical scheme adopted by the present application is:

[0005] In a first aspect, the embodiments of the present application provide a battery device, comprising:

[0006] a box body;

[0007] a plurality of battery monomers arranged in the box body along a first direction;

[0008] an expansion beam arranged in the box body and abutting against the battery monomer at the end in the first direction;

[0009] a reinforcing member comprising a main structure and a first limiting structure, the main structure being connected to the outside of the box body, the first limiting structure being connected to the main structure, and the first limiting structure being arranged in the box body and limited to the expansion beam to limit the movement of the expansion beam in the first direction away from the battery monomer.

[0010] In the above technical scheme, the reinforcing member with limiting function can effectively constrain the expansion beam and reasonably conduct the expansion force, solve the problem of easy failure of the expansion beam, and improve the overall stiffness and anti-deformation ability of the box body, thereby effectively improving the reliability of the battery device.

[0011] In some embodiments, the first limiting structure is located on the side of the expansion beam away from the battery monomer.

[0012] Alternatively, the first limiting structure is located at the end side of the extension direction of the expansion beam.

[0013] In the above technical scheme, the first limiting structure can be arranged at different positions of the expansion beam to limit the expansion beam, thereby meeting different installation requirements and improving the assembly flexibility.

[0014] In some embodiments, the first limiting structure is abutted to a side of the expansion beam away from the battery cell.

[0015] Alternatively, the first limiting structure is provided with a gap on a side of the expansion beam away from the battery cell.

[0016] In the above technical solution, the first limiting structure can directly contact the expansion beam for limiting, or can have a gap between the first limiting structure and the expansion beam. When the battery cell expands during use, the expansion beam can be moved until the first limiting structure is abutted, so that the position of the expansion beam is stable when bearing the continuous expansion force, and the load is effectively transmitted to the reinforcing member, thereby better playing the role of anti-expansion and anti-deformation. In addition, the gap can provide a buffer space to play a buffering role, effectively delaying and weakening the direct impact of the expansion beam on the first limiting structure, thereby improving the reliability of the first limiting structure.

[0017] In some embodiments, an end side of the expansion beam is provided with a limiting groove, and the first limiting structure is embedded in the limiting groove.

[0018] In the above technical solution, through the embedded mechanical limiting form, the position of the expansion beam is stable when bearing the continuous expansion force, and the load is effectively transmitted to the reinforcing member, thereby better playing the role of anti-expansion and anti-deformation.

[0019] In some embodiments, the box body includes a bottom wall, the expansion beam is arranged on the bottom wall, and a connecting structure is arranged between the expansion beam and the bottom wall.

[0020] In the above technical solution, by arranging the connecting structure between the expansion beam and the bottom wall, the installation stability of the expansion beam can be further improved, thereby improving the anti-expansion and anti-deformation capability.

[0021] In some embodiments, the main body structure is connected to a side of the bottom wall away from the expansion beam, and the first limiting structure is arranged through the bottom wall.

[0022] In the above technical solution, by arranging the main body structure below the bottom wall, the rigidity of the entire box body can be significantly improved without increasing the space occupation in the box body. By arranging the first limiting structure through the bottom wall, the first limiting structure can effectively position the expansion beam in the box body, so that the expansion beam cannot be deviated or detached when subjected to the expansion force, and the expansion force can be effectively transmitted from the expansion beam to the main body structure at the bottom, thereby improving the anti-expansion capability of the battery device.

[0023] In some embodiments, the box body comprises a peripheral wall, the peripheral wall is arranged at the edge of the bottom wall; the main body structure is connected to the side of the peripheral wall away from the expansion beam, and the first limiting structure is arranged through the peripheral wall.

[0024] In the above technical solution, by installing the main body structure on the outer side of the peripheral wall, the internal space of the box body is not occupied, thereby providing more arrangement space for the internal battery monomer and improving the rigidity of the entire box body. By arranging the first limiting structure through the peripheral wall, the position of the expansion beam in the box body can be effectively limited to prevent displacement or falling of the expansion beam due to the expansion force, and the expansion force can be effectively transmitted from the expansion beam to the main body structure on the outer side, thereby improving the anti-expansion capability of the battery device.

[0025] In some embodiments, the number of the reinforcing members is multiple, the peripheral wall is respectively provided with the main body structure on both sides along a first direction, and / or the peripheral wall is respectively provided with the main body structure on both sides along a second direction.

[0026] The first direction is perpendicular to the second direction.

[0027] In the above technical solution, by arranging multiple main body structures of the reinforcing members on the side edges in different directions of the peripheral wall, the overall rigidity of the box body can be improved, and the multi-point limiting of the expansion beam can be realized, thereby effectively improving the installation stability of the expansion beam, and the expansion force received by the expansion beam can be transmitted to the multiple main body structures, a multi-path load conduction design is formed, the risk of local stress concentration is significantly reduced, and the reliability of the expansion beam is improved.

[0028] In some embodiments, the main body structures on both sides of the peripheral wall along the first direction are connected to the main body structures on both sides of the peripheral wall along the second direction.

[0029] In the above technical solution, by connecting the multiple main body structures arranged along the first direction and the second direction, a ring-shaped reinforcing frame can be formed, the overall rigidity of the box body is further improved, and the anti-expansion capability of the battery device is further improved.

[0030] In some embodiments, the main body structure comprises a mounting portion, and the mounting portion is used for mounting the box body on an electric device.

[0031] In the above technical solution, by arranging the mounting portion, the main body structure can be used as a mounting beam and connected to the box body, the overall rigidity of the box body is improved, the expansion force of the battery monomer is effectively resisted by the constraint and limiting of the first limiting structure on the expansion beam, and the battery device can be quickly mounted on the electric device through the mounting portion. Therefore, the main body structure of the present application can realize the dual functions of strengthening and mounting by arranging the mounting portion, which can simplify the overall structure and reduce the manufacturing cost.

[0032] In some embodiments, a first flange part is arranged on a side edge of the peripheral wall away from the bottom wall; the main body structure comprises a main body part connected with the peripheral wall, the main body part is connected with the first limiting structure, the second flange part and the third flange part are connected to both sides of the main body part in the height direction, the second flange part is connected with the first flange part, and the third flange part is connected to a side of the bottom wall away from the expansion beam.

[0033] In the above technical solution, by arranging multiple flange parts on the peripheral wall and the main body structure and connecting them with each other, stable and reliable connection between the reinforcing part and the box body can be achieved, thereby improving the overall rigidity and anti-deformation capability of the battery device.

[0034] In some embodiments, the first limiting structure comprises a limiting body and a reinforcing rib plate, the limiting body is connected to the main body part and penetrates the peripheral wall, the limiting body is limited to the expansion beam, and the reinforcing rib plate is arranged in the limiting body.

[0035] In the above technical solution, by arranging the reinforcing rib plate in the limiting body, the rigidity of the first limiting structure can be improved, thereby enhancing the limiting reliability of the expansion beam and ensuring that the expansion beam effectively resists the expansion force of the battery monomer.

[0036] In some embodiments, the box body is provided with a positioning opening corresponding to the first limiting structure; a second limiting structure is arranged in the box body, the second limiting structure abuts against a side of the expansion beam away from the battery monomer, the second limiting structure is provided with a positioning cavity corresponding to the positioning opening in communication, and the first limiting structure is embedded in the positioning cavity through the positioning opening.

[0037] In the above technical solution, by introducing the positioning opening, the second limiting structure and the corresponding positioning cavity, efficient and reliable limiting can be achieved, which not only strengthens the constraint of the expansion beam, but also optimizes the force transmission path and improves the assembly efficiency.

[0038] In some embodiments, the number of expansion beams is two, and multiple battery monomers are arranged between the two expansion beams; the reinforcing part comprises two first limiting structures, each of which is limited to the expansion beam one by one, or the reinforcing part comprises four first limiting structures, one first limiting structure is arranged at each end of the expansion beam.

[0039] In the above technical solution, by arranging the expansion beam and the limiting structure at both ends of the multiple battery monomers respectively, bidirectional anti-expansion of the battery monomer and effective limiting of the expansion beam are realized, thereby preventing the battery monomer from expanding and deforming and improving the reliability of the battery device.

[0040] In a second aspect, the embodiments of the present application further provide a power utilization device, comprising the battery device described above.

[0041] The above description is only a summary of the technical solutions of the present application. In order to make the technical means of the present application more clear, the embodiments of the present application can be implemented according to the content of the description, and in order to make the above and other purposes, characteristics and advantages of the present application more obvious and easy to understand, the following will describe the specific embodiments of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0042] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0043] Figure 1 The structural schematic diagram of the vehicle provided by the embodiments of the present application is shown in the figure;

[0044] Figure 2 The structural explosion diagram of the battery device provided by the embodiments of the present application is shown in the figure;

[0045] Figure 3 The structural assembly diagram of the battery device provided by the embodiments of the present application from one perspective is shown in the figure;

[0046] Figure 4 The structural assembly diagram of the battery device provided by the embodiments of the present application from another perspective is shown in the figure;

[0047] Figure 5 The assembly schematic diagram of the first limiting structure provided by the embodiments of the present application is shown in the figure;

[0048] Figure 6 The structural schematic diagram of the expansion beam provided by the embodiments of the present application is shown in the figure;

[0049] Figure 7 The schematic diagram of the first limiting structure provided by the embodiments of the present application is shown in the figure;

[0050] Figure 8 The structural assembly diagram of the expansion beam provided by the embodiments of the present application is shown in the figure.

[0051] In the figure, various reference signs represent:

[0052] 1000, vehicle; 100, battery device; 200, controller; 300, motor;

[0053] 101, battery cell;

[0054] 102, box body; 1021, bottom wall; 1022, peripheral wall; 10221, positioning opening;

[0055] 10222, first flange part; 102221, first connecting hole;

[0056] 103, top cover;

[0057] 104, expansion beam; 1041, limiting groove;

[0058] 105, reinforcing member; 1051, main body structure; 10511, main body part; 105111, mounting hole;

[0059] 105112, side wall; 105113, hollow structure; 10512, second flange part;

[0060] 105121, second connecting hole; 10513, third flange part; 1052, first limiting structure;

[0061] 10521, limiting body; 105211, first wall; 105212, second wall; 105213, third wall;

[0062] 105214, fourth wall; 105215, limiting cavity; 10522, reinforcing rib plate;

[0063] 106, second limiting structure; 1061, positioning cavity;

[0064] 107, pressing strip. DETAILED DESCRIPTION

[0065] The embodiments of the technical scheme of the present application will be described in detail below with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical scheme of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0066] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terms used herein 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.

[0067] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified.

[0068] Reference herein to an "embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily mutually exclusive of one another. It is expressly understood that the embodiments described herein can be combined with each other in their various permutations and combinations.

[0069] In the description of the embodiments of the present application, the term "and / or" is merely an association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " herein generally represents an "or" relationship between the front and rear associated objects.

[0070] In the description of the embodiments of the present application, the term "a plurality of" refers to two or more (including two), and similarly, "a plurality of groups" refers to two or more groups (including two groups), and "a plurality of pieces" refers to two or more pieces (including two pieces).

[0071] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and are not intended to indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0072] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mounting", "connection", "connection", "fixing", and the like should be understood in a broad sense, for example, can be fixedly connected, or can be detachably connected, or can be integrated; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium; can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0073] At present, in a battery device, the battery monomer will expand in the charging and discharging cycle process or other factors, and the expansion force generated may cause the box containing the battery monomer to deform. Therefore, an expansion beam is usually used to resist the expansion force of the battery monomer, but the expansion beam is prone to displacement or installation failure under long-term stress or impact, resulting in weakened support effect, and further affecting the reliability of the battery device.

[0074] To improve the stability of the expansion beam and enhance the overall rigidity of the housing, this application provides a battery device with a reinforcing member. The main structure of the reinforcing member is directly connected to the housing, thereby enhancing the overall rigidity of the housing. The first limiting structure of the reinforcing member is connected to the main structure and extends into the housing, providing spatial restraint for the expansion beam, improving its installation stability and preventing displacement or detachment under stress. Furthermore, the first limiting structure transfers the expansion force on the expansion beam to the main structure. The main structure, as the main part of the reinforcing member, can bear and disperse the expansion force transmitted by the expansion beam, thus reducing the expansion force directly loaded on the housing. This significantly reduces the stress on the housing itself, thereby lowering the risk of deformation. Therefore, this application achieves effective constraint on the expansion beam and reasonable transmission of expansion force through the reinforcing member, improving the overall rigidity and deformation resistance of the housing, and thus effectively improving the reliability of the battery device.

[0075] The battery device disclosed in this application can be used in electrical devices that use the battery device as a power source or in various energy storage systems that use the battery device as an energy storage element. The electrical device can be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Among them, electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc., and spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0076] For ease of explanation, the following embodiments will be described using a vehicle 1000 as an example of an electrical device according to an embodiment of this application.

[0077] Reference Figure 1 As shown, Figure 1 This is a schematic diagram of the vehicle structure provided in an embodiment of this application. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device 100 is installed inside the vehicle 1000, and the battery device 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000; for example, the battery device 100 can serve as the operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle 1000 during starting, navigation, and driving.

[0078] In some embodiments, the battery device 100 can not only serve as an operating power source of the vehicle 1000, but also serve as a driving power source of the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0079] Referring to Figure 2 as shown, Figure 2 An exploded view of a battery device according to an embodiment of the present application is shown. The battery device 100 according to an embodiment of the present application can include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly can include a plurality of battery cells 101 connected in series, in parallel, or in a mixed connection through a busbar.

[0080] In some embodiments, the battery cell assembly is generally formed by arranging a plurality of battery cells 101.

[0081] As an example, the battery cell assembly can be a battery module formed by arranging and fixing a plurality of battery cells 101 into an independent module. As an example, the battery module can be formed by bundling a plurality of battery cells 101 with a cable tie.

[0082] In some embodiments, the battery device 100 can be a battery pack including a case 102 and one or more battery cell assemblies housed in the case 102.

[0083] As an example, a top cover 103 can be provided on the case 102. The case 102 and the top cover 103 are fastened to form a closed space inside the case 102 to house the battery cell assembly. Here, the closed space means covered or closed, which can be sealed or unsealed.

[0084] In some embodiments, the case 102 can be a part of a chassis structure of the vehicle 1000. For example, a part of the case 102 can be at least a part of a floor panel of the vehicle 1000, or a part of the case 102 can be at least a part of a cross beam and a longitudinal beam of the vehicle 1000.

[0085] The technical solutions described in the embodiments of the present application are applicable to various electric devices using battery cells 101, such as mobile phones, portable devices, notebook computers, electric vehicles, electric toys, electric tools, vehicles 1000, ships, and spacecraft, such as aircraft, rockets, space shuttles, and spacecraft.

[0086] In the embodiments of the present application, the battery cell 101 can be a secondary battery, which means that the battery cell 101 can be activated by charging after discharging to continue to be used.

[0087] The battery cell 101 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., and the present application is not limited thereto.

[0088] In some embodiments, referring to Figures 2 to 5 Figure 3 and Figure 4 a structural assembly diagram of the battery device provided by the present application, Figure 5 The present application provides a battery device, comprising: a box body 102, a plurality of battery cells 101, an expansion beam 104 and a reinforcing member 105. Wherein the plurality of battery cells 101 are arranged along the first direction X in the box body 102; the expansion beam 104 is arranged in the box body 102 and abuts against the battery cell 101 at the end in the first direction X; the reinforcing member 105 comprises a main body structure 1051 and a first limiting structure 1052, the main body structure 1051 is connected to the outside of the box body 102, the first limiting structure 1052 is connected with the main body structure 1051, and the first limiting structure 1052 is arranged in the box body 102 and limited to the expansion beam 104, so as to limit the movement of the expansion beam 104 along the first direction X away from the battery cell 101.

[0089] As shown in Figure 2 The first direction X can be the length direction of the box body 102, and the second direction Y can be the width direction of the box body 102, and the first direction X, the second direction Y and the height direction Z of the box body 102 are perpendicular to each other.

[0090] The box body 102 is the external support structure of the whole battery device, used for accommodating and protecting the internal battery cells 101. The plurality of battery cells 101 are arranged along the first direction X in the box body 102 to form a battery cell assembly. In the case where the reinforcing member 105 is not arranged, the battery cells 101 may expand in volume in the long-term charge and discharge cycle, generating an expansion force along the arrangement direction (i.e. the first direction X), thereby causing the deformation of the box body 102.

[0091] ​The expansion beam 104 is arranged in the box body 102 and abuts against the battery monomer 101 at the end of the first direction X, which can be understood as the outermost battery monomer 101 in the plurality of battery monomers 101 arranged along the first direction X. The expansion beam 104 is mainly used to resist the expansion force of the battery monomer 101 and prevent its deformation, thereby reducing the risk of deformation of the box body 102. The expansion beam 104 can be selected to have a certain rigidity and compression capacity to withstand continuous mechanical stress without deformation, for example, can be a metal profile, specifically a steel beam, an aluminum beam, etc. In the case that the expansion force of the battery monomer 101 is large and the number of battery monomers 101 in the same row is too large, the expansion beam 104 can also be added in the middle of the plurality of battery monomers 101 in the same row.

[0092] The reinforcing member 105 is a structural member with high rigidity, for example, can be selected from steel, aluminum alloy, etc. to ensure the bearing capacity. The reinforcing member 105 mainly includes two parts, i.e., the main structure 1051 and the first limiting structure 1052. The main structure 1051 is fixedly connected (such as welded, screwed, glued, etc.) with the box body 102, used to enhance the overall structural rigidity of the box body 102, share the mechanical load (including the expansion force of the battery monomer 101) originally borne by the box body 102, and improve the bending and torsional resistance. The first limiting structure 1052 is connected (such as welded, integrally formed, etc.) with the main structure 1051 and extends into the box body 102, used to limit and fix the expansion beam 104, prevent it from being displaced or falling off when subjected to the expansion force of the battery monomer 101, improve the installation stability of the expansion beam 104, and thus ensure the effectiveness of its resistance to the expansion force. The specific type of the first limiting structure 1052 of the embodiment of the present application is not particularly limited, for example, can be a boss, a bracket, a stop block, etc.

[0093] It can be understood that the reinforcing member 105 as a whole can play the role of enhancing the structural rigidity and limiting, and is also part of the force transmission path. Specifically, the battery monomer 101 expands during use, and the expansion force is transmitted to the expansion beam 104. The expansion beam 104 transmits the expansion force received to the first limiting structure 1052 of the reinforcing member 105. The first limiting structure 1052 conducts the expansion force to the main structure 1051 connected thereto. The main structure 1051 further disperses and transmits the expansion force to the box body 102. By optimizing the force transmission path, the present application can realize the shunting of the expansion force, so that the expansion force is preferentially borne and dispersed by the main structure 1051 with high rigidity, rather than directly loaded on the box body 102, thereby significantly reducing the stress borne by the box body 102 itself, and thus reducing the risk of deformation thereof.

[0094] And the main body structure 1051 is located outside the box body 102, and the first limiting structure 1052 is arranged in the box body 102. By arranging the main body structure 1051 outside the box body 102, the internal space of the box body 102 is not occupied, so that more arrangement space is provided for the internal battery monomer 101, the close arrangement between the battery monomers 101 is facilitated, the energy density is improved, and the rigidity of the box body 102 is improved. The first limiting structure 1052 is arranged in the box body 102, so that the effective limiting of the expansion beam 104 is realized.

[0095] Therefore, the battery device provided by the embodiment of the application can realize effective constraint of the expansion beam 104 and reasonable conduction of the expansion force through the reinforcing member 105 with the limiting function, solve the problem that the expansion beam 104 is prone to failure, and improve the overall rigidity and anti-deformation capability of the box body 102, thereby effectively improving the reliability of the battery device and facilitating the improvement of the energy density of the battery device.

[0096] In some embodiments, the first limiting structure 1052 is located on a side of the expansion beam 104 away from the battery monomer 101; or the first limiting structure 1052 is located on an end side of the expansion beam 104 in the extension direction.

[0097] The first limiting structure 1052 of the embodiment of the application can be arranged at different positions of the expansion beam 104 to limit the expansion beam 104, thereby meeting different installation requirements and improving assembly flexibility.

[0098] In some embodiments, referring to Figure 5 As shown in the figure, the first limiting structure 1052 abuts against a side of the expansion beam 104 away from the battery monomer 101.

[0099] In this mode, the first limiting structure 1052 is arranged on the outside of the expansion beam 104 (i.e., the side away from the battery monomer 101), forming a stop structure. When the battery monomer 101 expands to push the expansion beam 104 to move in the first direction X, the outside of the expansion beam 104 will contact the first limiting structure 1052, so that the expansion force is directly transmitted to the main body structure 1051 of the reinforcing member 105 through the first limiting structure 1052. This abutting stop limiting form is simple in structure and convenient to assemble, and can effectively ensure that the expansion beam 104 remains stable in position when bearing the continuous expansion force, avoids failure, and effectively transmits the load to the reinforcing member 105, thereby better playing the role of anti-expansion and anti-deformation.

[0100] In other embodiments, the first limiting structure 1052 is arranged with a gap on a side of the expansion beam 104 away from the battery monomer 101.

[0101] The first limiting structure 1052 and the expansion beam 104 have a gap. When the battery cell 101 expands during use, the expansion beam 104 can move along the first direction X until it abuts against the first limiting structure 1052. This ensures that the expansion beam 104 remains stable under continuous expansion force, preventing failure, and effectively transfers the load to the reinforcing member 105, thus better performing its anti-expansion and anti-deformation functions. Furthermore, the reserved gap provides buffer space, effectively delaying and weakening the direct impact of the expansion beam 104 on the first limiting structure 1052, thereby improving the reliability of the first limiting structure 1052.

[0102] In some embodiments, Figure 6 This is a schematic diagram of the expansion beam provided in an embodiment of this application. (Refer to...) Figure 6 As shown, a limiting groove 1041 is provided on the end side of the expansion beam 104 in the extension direction, and the first limiting structure 1052 is embedded in the limiting groove 1041.

[0103] In this method, a limiting groove 1041 matching the first limiting structure 1052 can be formed on the body of the expansion beam 104. The limiting groove 1041 can be a square groove, a T-shaped groove, a U-shaped groove, or a dovetail groove, etc. The first limiting structure 1052 is at least partially embedded in the limiting groove 1041, and the opening position of the limiting groove 1041 corresponds to the first limiting structure 1052. For example Figure 6 As shown, as an example, a limiting groove 1041 can be opened at the end of the expansion beam 104 along its extension direction (i.e., the second direction Y), and the first limiting structure 1052 can pass through the side of the box body 102 and be embedded in the groove. This interlocking method has higher connection stiffness and stability, thereby further improving the impact resistance and structural reliability of the expansion beam 104 under complex working conditions.

[0104] Therefore, the embedded mechanical fit limiting form provided in this application embodiment can ensure that the expansion beam 104 remains stable in position when subjected to continuous expansion force, avoids failure, and effectively transfers the load to the reinforcing member 105, thereby better playing the role of anti-expansion and anti-deformation.

[0105] In some embodiments, refer to Figure 3 As shown, the box body 102 includes a bottom wall 1021, an expansion beam 104 is disposed on the bottom wall 1021, and a connection structure (not shown in the figure) is provided between the expansion beam 104 and the bottom wall 1021.

[0106] In actual use, different battery monomers 101 and different use conditions (such as charge and discharge rate, ambient temperature, etc.) can cause different expansion forces of the battery monomers 101. Therefore, the embodiments of the present application can selectively set a connecting structure between the expansion beam 104 and the bottom wall 1021, so that the fixing mode and strength of the expansion beam 104 can be flexibly adjusted according to the actual expansion force of the battery monomer 101, thereby ensuring that the expansion beam 104 can effectively bear and disperse these forces. The specific type of the connecting structure of the embodiments of the present application is not particularly limited, for example, it can be a welding structure (such as welding wire, welding rod, etc.), a bolt, a structural adhesive, etc.

[0107] For example, in a high expansion force working condition, the bottom of the expansion beam 104 and the bottom wall 1021 of the battery box are fixedly connected through the connecting structure to enhance the overall structural rigidity of the expansion beam 104, ensure stability, and prevent displacement or overturning of the expansion beam 104 due to stress; while in a low expansion force working condition, no additional connecting structure can be provided between the bottom of the expansion beam 104 and the bottom wall 1021 of the battery box. At this time, the expansion beam 104 relies on the contact with the battery monomer 101 and the constraint provided by the first limiting structure 1052 to meet the anti-expansion requirement, thereby adapting to structural deformation and reducing assembly complexity. The expansion force of the battery monomer 101 can be obtained by simulation or testing. When the expansion force of the battery monomer 101 is greater than a preset threshold, it is a high expansion force working condition, otherwise it is a low expansion force working condition.

[0108] Therefore, the embodiments of the present application achieve precise response to the expansion force of the battery monomer 101 by setting an optional connecting structure between the expansion beam 104 and the bottom wall 1021 of the box, which can not only ensure the reliability of the structure, but also take into account cost effectiveness and manufacturing flexibility.

[0109] In some embodiments, the main body structure 1051 is connected to the side of the bottom wall 1021 away from the expansion beam 104, and the first limiting structure 1052 is provided through the bottom wall 1021.

[0110] The embodiments of the present application install the main body structure 1051 of the reinforcement 105 on the side of the bottom wall 1021 away from the expansion beam 104, i.e. below the bottom wall 1021, and the main body structure 1051 does not directly contact the expansion beam 104, but indirectly acts through the bottom wall 1021. This way can make full use of the space at the bottom of the box 102, avoiding additional occupation in the arrangement direction of the battery monomers 101, which is conducive to the compact layout of the battery monomers 101 and improves the energy density. The stiffness of the box 102 can be improved without increasing the space occupation in the box 102.

[0111] And, the first limiting structure 1052 is arranged through the bottom wall 1021, so that it can effectively position the expansion beam 104 in the box 102, which not only ensures that the expansion beam 104 will not be offset or fall off when subjected to the expansion force, but also effectively transmits the expansion force from the expansion beam 104 to the main structure 1051 at the bottom of the box 102 to bear and disperse, thereby improving the ability of the battery device to resist expansion.

[0112] In some embodiments, referring to Figure 3 As shown, the box 102 includes a peripheral wall 1022 surrounding the edge of the bottom wall 1021; the main structure 1051 is connected to the side of the peripheral wall 1022 away from the expansion beam 104, and the first limiting structure 1052 is arranged through the peripheral wall 1022.

[0113] In the embodiments of the present application, the main structure 1051 of the reinforcing member 105 is arranged on the side of the peripheral wall 1022 away from the expansion beam 104, i.e., the outer side of the peripheral wall 1022, so that it does not occupy the internal space of the box 102, thereby providing more arrangement space for the internal battery monomers 101, helping to maintain the close arrangement of the battery monomers 101, improving the energy density, and improving the rigidity of the box 102.

[0114] And, the first limiting structure 1052 is arranged through the peripheral wall 1022, so that it can effectively limit the position of the expansion beam 104 in the box 102, prevent it from being displaced or falling off due to the expansion force, and effectively transmit the expansion force from the expansion beam 104 to the main structure 1051 on the outer side of the box 102 to bear and disperse, thereby improving the anti-expansion ability of the battery device.

[0115] In some embodiments, the number of reinforcing members 105 is multiple, and the peripheral wall 1022 is respectively provided with a main structure 1051 on both sides along the first direction X, and / or the peripheral wall 1022 is respectively provided with a main structure 1051 on both sides along the second direction Y.

[0116] By arranging multiple main structures 1051 of the reinforcing member 105 on the sides of the peripheral wall 1022 in different directions, and respectively connecting a first limiting structure 1052 to each main structure 1051, a multi-directional reinforcing and multi-point limiting structure layout can be formed, the overall rigidity of the box 102 is improved, the expansion beam 104 is multi-point constrained, the installation stability of the expansion beam 104 is effectively improved, the expansion force received by the expansion beam 104 is respectively transmitted to multiple main structures 1051 for dispersion, a multi-path load conduction design is formed, the risk of local stress concentration is significantly reduced, and the reliability of the expansion beam 104 is improved.

[0117] In some embodiments, the body structures 1051 on both sides of the peripheral wall 1022 along the first direction X are connected to the body structures 1051 on both sides of the peripheral wall 1022 along the second direction Y.

[0118] When the plurality of body structures 1051 arranged along the first direction X and the second direction Y are connected to each other (such as welding, integral molding, etc.), they collectively constitute a closed annular reinforcing frame arranged continuously around the outside of the peripheral wall 1022 of the battery box 102, which can significantly improve the overall rigidity of the box 102. Moreover, when the expansion force of the expansion beam 104 is transmitted to the corresponding side body structure 1051 through the first limiting structure 1052, the load can be transmitted to the body structure 1051 in the adjacent direction through the connecting part between the body structures 1051, realizing multi-directional collaborative stress and dispersion, avoiding local overload, improving the load bearing efficiency of the body structure 1051, thereby ensuring the effectiveness of the expansion beam 104 and improving the anti-expansion capability of the battery device.

[0119] In some embodiments, the body structure 1051 comprises a mounting portion for mounting the box 102 on the electric device.

[0120] As shown in Figure 3 , the mounting portion can be the main body portion 10511 of the body structure 1051, so that the body structure 1051 of the reinforcing member 105 can serve as a mounting beam and be connected to the box 102, which can improve the overall rigidity of the box 102 and effectively resist the expansion force of the battery monomer 101 through the first limiting structure 1052. The mounting portion can be provided with mounting holes 105111, connecting ears or standard interfaces, which are connected to the electric device through bolts or other fasteners, thereby realizing quick installation and fixation of the battery device. Moreover, a plurality of reinforcing members 105 are provided, and the body structures 1051 of the plurality of reinforcing members 105 are arranged on both sides of the peripheral wall 1022 along the first direction X and / or the second direction Y, which can improve the stability of the mounting.

[0121] It can be understood that in the conventional design of the battery device, the battery box 102 needs to be separately provided with a reinforcing beam and a mounting bracket, resulting in a large number of structural parts and high manufacturing cost. However, the body structure 1051 of the reinforcing member 105 can realize the dual functions of structural reinforcement and mounting by serving as a mounting beam in the embodiments of the present application, i.e., one beam with multiple functions, thereby simplifying the overall structure and reducing the manufacturing cost.

[0122] In some embodiments, referring to Figure 3 and Figure 4As shown, the box body 102 is provided with a positioning opening 10221 corresponding to the first limiting structure 1052; the box body 102 is provided with a second limiting structure 106, the second limiting structure 106 abuts against one side of the expansion beam 104 away from the battery monomer 101, and the second limiting structure 106 is provided with a positioning cavity 1061 in communication with the positioning opening 10221, and the first limiting structure 1052 is embedded in the positioning cavity 1061 through the positioning opening 10221. It can be understood that, Figure 3 and Figure 4 The expansion beam 104 in Figure 8 As shown, Figure 8 is a structure assembly drawing of the expansion beam provided by the embodiment of the application.

[0123] The second limiting structure 106 can be made of a material with certain rigidity and pressure resistance to withstand continuous mechanical stress without deformation, for example, steel, aluminum alloy or the like. The second limiting structure 106 is arranged in the box body 102 and located at one side of the expansion beam 104 away from the battery monomer 101, directly abutting against the expansion beam 104 to provide additional support and limiting effect. The second limiting structure 106 is internally provided with a positioning cavity 1061, which is in communication with the positioning opening 10221 on the peripheral wall 1022 of the box body 102, the positioning opening 10221 is used to guide and fix the position of the first limiting structure 1052, to ensure that it is accurately embedded in the positioning cavity 1061 of the second limiting structure 106 to form a stable connection, thereby realizing the rapid and accurate assembly of the reinforcing member 105, simplifying the assembly process and improving the production efficiency.

[0124] It can be understood that the second limiting structure 106 directly contacts the expansion beam 104 to provide preliminary limiting to prevent the expansion beam 104 from being displaced or falling off due to the expansion force, avoiding failure. The first limiting structure 1052 is embedded in the positioning cavity 1061 of the second limiting structure 106 through the positioning opening 10221 to provide further limiting, which can improve the rigidity of the second limiting structure 106, thereby enhancing the restraining and limiting ability of the expansion beam 104, and through this double limiting form, the stability of the expansion beam 104 can be effectively ensured. In addition, in order to further improve the connection reliability between the first limiting structure 1052 and the second limiting structure 106, the positioning cavity 1061 of the second limiting structure 106 can also be filled with structural glue, thereby realizing the stable bonding between the limiting structures.

[0125] When the battery cell 101 expands, the expansion force acts on the expansion beam 104, which transmits the expansion force to the second limiting structure 106. Subsequently, the force is transmitted to the main structure 1051 through the first limiting structure 1052 for dispersion. This multi-level force transmission path helps to evenly disperse the expansion force, reduce local stress concentration, and thus extend the service life of the battery device.

[0126] Therefore, by introducing the positioning port 10221, the second limiting structure 106, and the corresponding positioning cavity 1061, the embodiments of this application can achieve efficient and reliable limiting, which not only strengthens the constraint on the expansion beam 104, but also optimizes the force transmission path and improves assembly efficiency.

[0127] In some embodiments, refer to Figure 3 and Figure 8 As shown, multiple battery cells 101 are arranged after pre-compression; the second limiting structure 106 is located on the side of the expansion beam 104 facing away from the battery cells 101, and has a preset assembly gap with the expansion beam 104; the assembly gap is configured such that when the battery cells 101 release the pre-compression rebound force, the expansion beam 104 is driven to move along the first direction X until it forms an abutment fit with the second limiting structure 106.

[0128] Before multiple battery cells 101 are assembled and placed into the box, they undergo pre-compression treatment in the first direction X. The second limiting structure 106 is located on the side of the expansion beam 104 facing away from the battery cell 101, and a preset assembly gap is left between the two. The existence of this gap is to provide space for the rebound of the battery cell 101 after the pre-compression is released, ensuring that the expansion beam 104 can move and eventually form an abutment fit with the second limiting structure 106.

[0129] Specifically, when the battery cells 101 are under pre-compression, they are tightly arranged into a battery cell assembly. At this time, there is a certain assembly gap between the expansion beam 104 connected to the end of the battery cell assembly and the second limiting structure 106, with a gap tolerance of ±0.5mm. When the battery cell assembly is placed into the housing 102, as the battery cells 101 gradually release the pre-compression, they begin to expand outward (spring back) along the first direction X. The expansion beam 104 is pushed and moves along the first direction X. As the battery cells 101 spring back, the expansion beam 104 gradually approaches the second limiting structure 106 until the two contact and form an abutment fit. At this time, the expansion beam 104 not only receives additional restraint, but the assembly of the battery cells 101 also achieves precise alignment and fixation, significantly improving the assembly accuracy.

[0130] Therefore, by setting the preset assembly gap between the expansion beam 104 and the second limiting structure 106, and by using the pre-pressing and rebounding characteristics of the battery monomer 101, the application can ensure that the gap is absorbed when the battery monomer 101 rebounds, and there is no gap between the battery monomer 101, the expansion beam 104 and the second limiting structure 106, thereby realizing automatic compensation of assembly positioning, improving the overall stiffness and anti-deformation ability of the expansion beam 104, and enhancing the reliability of the entire battery device.

[0131] In some embodiments, referring to Figure 3 and Figure 4 As shown, the second limiting structure 106 is arranged on the peripheral wall 1022 and is sealingly connected to the positioning opening 10221.

[0132] By directly installing the second limiting structure 106 on the inner side of the peripheral wall of the box 102, a stable connection with the box 102 structure can be formed, and the overall rigidity is improved. In addition, the second limiting structure 106 and the positioning opening 10221 on the peripheral wall 1022 are sealingly connected (such as welding, one-piece molding, etc.), which can realize the effect of not breaking the seal of the opening, ensure the sealing performance of the positioning opening 10221, prevent water vapor and conductive dust from entering the box 102, and avoid short circuit, corrosion and other problems, thereby improving the reliability of the battery device and prolonging the service life of the battery. As an example, the second limiting structure 106 and the box 102 are a one-piece molding structure. During molding, the outer side of the peripheral wall 1022 of the box 102 can be stamped by a mold, thereby forming the second limiting structure 106 recessed into the box 102 on the peripheral wall 1022, and forming the positioning opening 10221 at the stamped position of the peripheral wall 1022. The second limiting structure 106 can be a limiting block, which is simple in structure and easy to manufacture.

[0133] In some embodiments, referring to Figure 3 As shown, the side edge of the peripheral wall 1022 away from the bottom wall 1021 is provided with a first flange portion 10222; the main body structure 1051 includes a main body portion 10511, a second flange portion 10512 and a third flange portion 10513, the main body portion 10511 includes a side wall 105112 connected with the peripheral wall 1022, the side wall 105112 is connected with the first limiting structure 1052, the second flange portion 10512 and the third flange portion 10513 are connected to both sides of the side wall 105112 along the height direction Z, and the second flange portion 10512 is connected with the first flange portion 10222, and the third flange portion 10513 is connected to one side of the bottom wall 1021 away from the expansion beam 104.

[0134] The first flange 10222 is located on the upper edge of the peripheral wall 1022 away from the bottom wall 1021, and can provide a connection point for the second flange 10512. The main body 10511 includes a side wall 105112 adjacent to the peripheral wall 1022 of the housing, and the side wall 105112 can be connected to the peripheral wall 1022 by structural adhesive. The second flange 10512 is connected to the top side of the side wall 105112 along the height direction Z. The first flange 10222 can be provided with a plurality of first connecting holes 102221 at intervals along its length direction. The second flange 10512 is provided with second connecting holes 105121 corresponding to the first connecting holes 102221. The first connecting holes 102221 and the second connecting holes 105121 can be connected by fasteners such as bolts, thereby realizing the connection between the first flange 10222 and the second flange 10512, and further enhancing the connection between the main structure 1051 and the peripheral wall 1022. The third flange 10513 is connected to the bottom side of the side wall 105112 along the height direction Z, and can be connected to the bottom wall 1021 opposite to the lower side of the expansion beam 104 by structural adhesive, providing additional support and stability. The first limiting structure 1052 is connected to the side wall 105112 and passes through the positioning port 10221 in the peripheral wall 1022 to limit the expansion beam 104 and prevent it from displacing or failing due to expansion force.

[0135] It is understood that in this embodiment, the main structure 1051 is connected to the peripheral wall 1022 via the side wall 105112, and simultaneously, through the connection between the second flange 10512 and the first flange 10222, and the connection between the third flange 10513 and the bottom wall 1021, multi-point fixation is achieved. This effectively increases the contact area between the main structure 1051 and the housing 102, achieving a stable and reliable connection between the reinforcing member 105 and the housing 102, thereby improving the overall rigidity and deformation resistance of the battery device.

[0136] In some embodiments, refer to Figure 3 As shown, the main body 10511 has a hollow structure 105113.

[0137] The embodiment of the present application can use finite element analysis software and other tools to analyze the stress and deformation of the main structure 1051 of the reinforcing member 105, identify the areas with less or almost no stress, and perform targeted hollowing treatment on the areas. The number of hollow structures 105113 can be one or more, and the hollow structure 105113 can be a channel extending in the first direction X, and the cross-sectional shape of the channel can be circular, polygonal (such as triangular, square, pentagonal), etc. By introducing the hollow design in the main structure 1051, unnecessary material parts can be removed without affecting the reinforcing function as much as possible, thereby reducing the overall weight, which means longer cruising range for electric vehicles. It is worth mentioning that the hollow structure 105113 can also serve as a ventilation and heat dissipation channel, which helps to dissipate heat from the inside of the box 102 more quickly, thereby improving the temperature control management of the battery device and improving the reliability of the battery device.

[0138] In some embodiments, Figure 7 A schematic view of the first limiting structure provided by the embodiment of the present application is shown in FIG. 1. Referring to FIG. 1, Figure 3 and Figure 7 The first limiting structure 1052 includes a limiting body 10521 and a reinforcing rib plate 10522, the limiting body 10521 is connected to the side wall 105112 and penetrates the peripheral wall 1022, the limiting body 10521 is limited to the expansion beam 104, and the reinforcing rib plate 10522 is arranged in the limiting body 10521.

[0139] As shown in Figure 7 The limiting body 10521 is the main part of the first limiting structure 1052 and can be a limiting support, which includes a first wall 105211, a second wall 105212, a third wall 105213, and a fourth wall 105214. The first wall 105211 can be vertically welded to the side wall 105112, the second wall 105212 and the third wall 105213 are connected to the upper and lower sides of the first wall 105211, respectively, the second wall 105212 and the third wall 105213 are arranged transversely, and the fourth wall 105214 is connected between the first wall 105211, the second wall 105212, and the third wall 105213, respectively, and located on one side adjacent to the expansion beam 104, thereby enclosing a limiting cavity 105215 with an opening. The opening is located on the side away from the expansion beam 104.

[0140] The function of the limiting body 10521 is to withstand the expansion force from the expansion beam 104 and transmit it to the main structure 1051. The reinforcing rib 10522 can be laterally connected within the limiting cavity 105215. The reinforcing rib 10522 can be welded to the limiting body 10521 or integrally formed to enhance the rigidity and deformation resistance of the limiting body 10521. There can be one or more reinforcing ribs 10522; the specific number can be adjusted according to the expansion force of the battery cell 101. The greater the expansion force, the more reinforcing ribs 10522 are required, thereby improving the ability to resist the expansion force. The number of reinforcing ribs 10522 can be easily adjusted through an opening on one side of the limiting cavity 105215.

[0141] Therefore, by providing a reinforcing rib 10522 in the limiting body 10521, the rigidity of the first limiting structure 1052 can be improved, thereby enhancing the limiting reliability of the expansion beam 104 and ensuring that the expansion beam 104 effectively resists the expansion force of the battery cell 101.

[0142] In some embodiments, refer to Figure 3 and Figure 5 As shown, there are two expansion beams 104, and multiple battery cells 101 are disposed between the two expansion beams 104; the reinforcing member 105 includes two first limiting structures 1052, which are respectively positioned on the expansion beams 104, or the reinforcing member 105 includes four first limiting structures 1052, with one first limiting structure 1052 provided at each end of an expansion beam 104.

[0143] Multiple battery cells 101 are arranged along a first direction X to form a battery cell assembly. Two expansion beams 104 are located at both ends of the battery cell assembly to resist expansion forces from both ends of the battery cell assembly. Correspondingly, the reinforcing member 105 has a first limiting structure 1052 at each end along the first direction X. Each first limiting structure 1052 cooperates with one expansion beam 104 to form a pair of end constraints. Alternatively, a first limiting structure 1052 is provided at each end of an expansion beam 104, thereby forming two pairs of end constraints.

[0144] In addition, second limiting structures 106 can be respectively provided at both ends of the inner side of the box wall 1022 along the first direction X. Each first limiting structure 1052 can correspond to a second limiting structure 106. The first limiting structure 1052 passes through the positioning port 10221 on the peripheral wall 1022 and is embedded in the positioning cavity 1061 of the corresponding second limiting structure 106, thereby ensuring that the expansion beams 104 at both ends will not be displaced or deflected when subjected to expansion force.

[0145] When the battery monomer 101 expands during the charging and discharging process, the expansion force will be transmitted from the middle to the two ends, and the expansion beams 104 at both ends will bear the expansion force. Since there are two expansion beams 104 acting at the same time, the expansion force can be more evenly distributed at both ends, avoiding the risk of unilateral expansion beam 104 failure due to excessive load. The expansion beam 104 will transmit the received expansion force to the corresponding first limiting structure 1052 through the second limiting structure 106, and then the first limiting structure 1052 will further conduct the force to the main structure 1051 for dispersion, reducing the risk of local stress concentration.

[0146] In addition, during the pre-pressing release rebound process, the expansion beam 104 will move in the first direction X until it forms an abutting fit with the corresponding second limiting structure 106. The expansion beams 104 at both ends adjust synchronously, ensuring that the battery monomer 101 maintains the correct arrangement and close contact state in the entire box 102, thereby achieving automatic compensation of assembly positioning.

[0147] Therefore, the embodiments of the present application achieve bidirectional anti-expansion of the battery monomer 101 and effective limiting of the expansion beam 104 by arranging the expansion beam 104 and the limiting structure at both ends of the plurality of battery monomers 101, thereby preventing the battery monomer 101 from expanding and deforming and improving the reliability of the battery device.

[0148] In some embodiments, the expansion beam 104 is provided with a first limiting structure 1052 at both ends in the second direction Y.

[0149] The embodiments of the present application can limit the end side of the expansion beam 104 by arranging the first limiting structure 1052 at both ends of the expansion beam 104, further improving its stability, thereby facilitating the ability to resist expansion and deformation.

[0150] In some embodiments, referring to Figure 3 and Figure 8 , the number of expansion beams 104 is two, and the plurality of battery monomers 101 is arranged between the two expansion beams 104; the battery device includes a pressing strip 107, the pressing strip 107 is arranged on the plurality of battery monomers 101 along the first direction X, and the two ends of the pressing strip 107 are respectively connected with the two expansion beams 104 one by one.

[0151] The battery device of the present application further introduces the pressing strip 107 structure, which cooperates with the expansion beams 104 arranged at both ends to form a kind of pre-tightening anti-expansion frame structure, which can significantly improve the ability of the battery device to resist the expansion force of the battery monomer 101. The specific type of the pressing strip 107 of the present application is not particularly limited, for example, it can be a strip, a pull rod or the like. The material of the pressing strip 107 can be selected from high-strength steel, aluminum alloy or carbon fiber composite material, taking into account strength and lightweight.

[0152] Specifically, the plurality of battery monomers 101 are arranged into a battery monomer assembly along the first direction X, and two expansion beams 104 are respectively located at two ends of the battery monomer assembly along the first direction X. The pressing strip 107 extends along the first direction X and can be arranged above or beside the battery monomer assembly, and spans the entire battery monomer assembly. The two ends of the pressing strip 107 can be connected with the two expansion beams 104 respectively by welding, bolt connection, buckle connection or the like, to form a tension frame structure. During assembly, the pressing strip 107 can be pre-tightened (such as by bolt fastening, elastic crimping or the like) to exert an inward tension on the two expansion beams 104, which tightens the two expansion beams 104 in the middle and thus exerts a pre-pressure on the plurality of battery monomers 101 along the first direction X.

[0153] When the battery monomers 101 expand during charging and discharging, the expansion force generated thereby overcomes the pre-tightening force provided by the pressing strip 107. When the expansion force is greater than the pre-tightening force, the battery monomer assembly as a whole tends to elongate, and at this time the expansion beams 104 and the corresponding limiting structures bear the net thrust. Therefore, the pressing strip 107 plays a buffering role, effectively delaying and weakening the direct impact of the expansion force on the expansion beams 104, thereby improving the reliability of the expansion beams 104.

[0154] As an example, the side portion of each expansion beam 104 can be limited by the first limiting structure 1052 of the reinforcing member 105 and the second limiting structure 106, the bottom portion can be limited by bonding with the bottom wall 1021 of the box body by structural adhesive, and the upper portion can be limited by the pressing strip 107, thereby achieving multi-directional limiting and restraining of the expansion beam 104 and effectively ensuring the stability of the expansion beam 104.

[0155] Therefore, the embodiment of the present application can ensure the stability of the expansion beam 104 by introducing the pressing strip 107 structure, thereby improving the ability to resist the expansion force of the battery monomers 101.

[0156] In some embodiments, referring to Figure 7 It is shown that the number of the pressing strips 107 is positively correlated with the expansion force of the battery monomers 101.

[0157] When the length of the battery monomer assembly formed by the plurality of battery monomers 101 and the number of series and parallel connections are greater, the total expansion force is greater. The pressing strip 107, as a key structure for transmitting pre-tightening force, restraining the expansion beam 104 and maintaining the stability of the battery monomer assembly, can be reasonably configured according to the actual expansion force borne by the battery device. In high expansion force working conditions, the number of pressing strips 107 is increased to improve the overall constraint stiffness; in low expansion force working conditions, the number of pressing strips 107 is reduced to optimize the structural compactness and cost.

[0158] For example, the total expansion force F1 can be calculated based on the expansion force test data of the battery monomer 101 in combination with the number of battery monomer assembly strings, and then the required number of pressing strips N can be calculated according to the expansion force F2 that can be borne by a single pressing strip 107, that is, N = F1 / F2. As an example, 2-4 parallel pressing strips 107 can be arranged above the battery monomer assembly, respectively at the two sides and the center position, so as to form multi-point tensioning.

[0159] Therefore, by adjusting the number of pressing strips 107 to balance the expansion stress, the application embodiment can realize on-demand supply of structural strength, ensure the overall tensile stiffness, and thus ensure the effectiveness of the expansion beam 104 and the stability of the battery monomer assembly structure.

[0160] In some embodiments, the material of the box 102 is a composite material, and / or the material of the reinforcing member 105 is a metal material.

[0161] The composite material is a material composed of a base material and a reinforcing material. The base material can be resin, which can include unsaturated polyester resin and epoxy resin; the reinforcing material can be fiber, which can include glass fiber and carbon fiber according to the fiber material, and can include short fiber, long fiber and continuous glass fiber according to the fiber length. The composite material can be formed by processes such as resin transfer molding (RTM) or prepreg compression molding (PCM). For example, when using the RTM molding process, the glass fiber can be laid in the mold, and then the liquid resin is injected into the mold to be cured and formed. When using the PCM molding process, the glass fiber can be pre-impregnated with resin support prepreg, and then placed in the mold for heating and pressurization to cure and form.

[0162] In the application embodiment, the use of composite material for the box 102 can greatly reduce the overall weight, and when the battery device is applied to a vehicle, the vehicle's cruising range can be extended and energy consumption can be reduced. The use of metal materials (such as high-strength steel and aluminum alloy) for the reinforcing member 105 can withstand large mechanical loads and enhance the overall stiffness of the box 102 to ensure its reliability and stability. Therefore, the synergistic effect of the composite material box 102 and the metal reinforcing member 105 in the application embodiment can realize the lightweight of the battery device and ensure its structural strength and reliability under complex working conditions.

[0163] In some embodiments, the application also provides an electric device, which includes the battery device 100 of any of the above embodiments, and the battery device 100 is used to provide electric energy for the electric device.

[0164] The electric device can be a device or system that uses the battery device 100 as described above.

[0165] The above merely preferred embodiments of the present application and are not intended to limit the present application. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall fall within the scope of the present application. In particular, the technical features mentioned in each embodiment can be combined in any manner as long as there is no structural conflict. 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 device, characterized by, The application relates to a battery pack, comprising: a box body; a plurality of battery cells arranged in the box body along a first direction; an expansion beam arranged in the box body and abutting against the battery cells at the end in the first direction; a reinforcing member comprising a main structure connected to the outside of the box body and a first limiting structure connected to the main structure and arranged in the box body and limiting the expansion beam to move away from the battery cells in the first direction.

2. The battery device according to claim 1, characterized by The first limiting structure is located on the side of the expansion beam away from the battery cells. Alternatively, the first limiting structure is located on the end side of the extension direction of the expansion beam.

3. The battery device of claim 2, wherein When the first limiting structure is located on the side of the expansion beam away from the battery cells, the first limiting structure abuts against the side of the expansion beam away from the battery cells. Alternatively, when the first limiting structure is located on the side of the expansion beam away from the battery cells, the first limiting structure is arranged with a gap on the side of the expansion beam away from the battery cells.

4. The battery device of claim 2, wherein The end side of the expansion beam is provided with a limiting groove, and the first limiting structure is embedded in the limiting groove.

5. The battery device of claim 1, wherein The box body comprises a bottom wall, the expansion beam is arranged on the bottom wall, and a connecting structure is arranged between the expansion beam and the bottom wall.

6. The battery device of claim 5, wherein The main structure is connected to the side of the bottom wall away from the expansion beam, and the first limiting structure is arranged in the bottom wall.

7. The battery device of claim 5, wherein The box body comprises a peripheral wall arranged around the edge of the bottom wall; the main structure is connected to the side of the peripheral wall away from the expansion beam, and the first limiting structure is arranged in the peripheral wall.

8. The battery device of claim 7, wherein, The number of reinforcing members is plural, the peripheral wall is provided with the main structure on the two sides along a first direction, and / or the peripheral wall is provided with the main structure on the two sides along a second direction. The first direction is perpendicular to the second direction.

9. The battery device of claim 8, wherein, The main structures on the two sides of the peripheral wall along the first direction and the main structures on the two sides of the peripheral wall along the second direction are connected to each other.

10. The battery device of claim 8, wherein, The main structure comprises a mounting part for mounting the box body on an electric device.

11. The battery device of claim 7, wherein, The side edge of the peripheral wall away from the bottom wall is provided with a first flanging part; the main structure comprises a main part, a second flanging part and a third flanging part, the main part is connected to the peripheral wall, the main part is connected with the first limiting structure, the second flanging part and the third flanging part are connected to the two sides of the main part along the height direction, the second flanging part is connected to the first flanging part, and the third flanging part is connected to the side of the bottom wall away from the expansion beam.

12. The battery device of claim 11, wherein, The first limiting structure comprises a limiting body and a reinforcing rib plate, the limiting body is connected to the main part and arranged in the peripheral wall, the limiting body is limited to the expansion beam, and the reinforcing rib plate is arranged in the limiting body.

13. The battery device according to any one of claims 1 to 12, characterized by, The box is provided with a positioning opening corresponding to the first limiting structure; the box is provided with a second limiting structure inside, the second limiting structure abuts against one side of the expansion beam away from the battery monomer, and the second limiting structure is provided with a positioning cavity in communication with the positioning opening, and the first limiting structure is embedded in the positioning cavity through the positioning opening.

14. The battery device according to any one of claims 1 to 12, characterized by, The number of the expansion beams is two, and a plurality of battery monomers are arranged between the two expansion beams; the reinforcing member includes two first limiting structures, and the first limiting structures are respectively and correspondingly limited to the expansion beams, or the reinforcing member includes four first limiting structures, and one end of each of the expansion beams is provided with one first limiting structure.

15. An electrical device, comprising: The battery device of any one of claims 1 to 14, the battery device being used to provide electrical energy. The battery device of any one of claims 1 to 14, the battery device being used to provide electrical energy.

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