Battery pack and electric device

Abstract

The application provides a battery pack and an electric device. The battery pack comprises a box body having a receiving cavity, a battery module arranged in the receiving cavity, an expansion beam arranged in the receiving cavity and connected with the box body, a reinforcing beam arranged in the receiving cavity and connected with the box body and the expansion beam, and a tensioning assembly extending along a second direction and connected with the battery module and the expansion beam. The tensioning assembly and the reinforcing beam are arranged along a first direction. The battery pack can prevent the interference between the connecting block of the expansion beam and the reinforcing beam during assembly, reduce the assembly difficulty and improve the assembly efficiency.

Description

Technical Field

[0001] This application belongs to the field of battery technology, specifically relating to a battery pack and an electrical device. Background Technology

[0002] Battery packs, as an important power source for electrical equipment, are widely used in new energy vehicles, aerospace, and other technological fields. Currently, battery packs contain multiple battery cells. During charging and discharging, these cells expand. Expansion beams are installed inside the pack to resist the expansion forces of the cells during charging and discharging. Reinforcing beams connect the expansion beams to the pack body to improve the overall strength of the battery pack.

[0003] However, during the assembly of the expansion beam and the reinforcing beam, interference can easily occur between the reinforcing beam and the components connected to the expansion beam, which increases the assembly difficulty, affects the structural strength and load-bearing capacity of the reinforcing beam, and increases manufacturing costs and process difficulty. Utility Model Content

[0004] This application aims to provide a battery pack and power supply device to solve the problem that existing reinforcing beams and components connected to expansion beams are prone to interference, which increases assembly difficulty, affects the structural strength and load-bearing capacity of the reinforcing beams, and increases manufacturing costs and process difficulty.

[0005] To solve the above-mentioned technical problems, this application is implemented as follows:

[0006] In a first aspect, this application discloses a battery pack having a first orientation, the battery pack comprising:

[0007] The housing has a receiving cavity;

[0008] The battery module is disposed within the receiving cavity;

[0009] An expansion beam is disposed within the receiving cavity and connected to the box body;

[0010] A reinforcing beam is disposed within the receiving cavity and is connected to both the box body and the expansion beam.

[0011] A tensioning assembly extending along the second direction and connecting the battery module to the expansion beam;

[0012] The tensioning assembly and the reinforcing beam are spaced apart along the first direction.

[0013] Optionally, the expansion beam divides the receiving cavity into a first sub-cavity and a second sub-cavity;

[0014] The battery pack includes a battery module and a control module. The battery module is disposed in the first sub-cavity and is connected to the expansion beam and the housing.

[0015] The control module and the reinforcing beam are disposed in the second sub-cavity, and the control module is electrically connected to the battery module;

[0016] The expansion beam includes a first surface adjacent to the first sub-cavity.

[0017] The tensioning assembly is connected to the first surface.

[0018] Optionally, the expansion beam divides the receiving cavity into a first sub-cavity and a second sub-cavity;

[0019] The battery pack includes a battery module and a control module. The battery module is disposed in the first sub-cavity and is connected to the expansion beam and the housing.

[0020] The control module and the reinforcing beam are disposed in the second sub-cavity, and the control module is electrically connected to the battery module;

[0021] The expansion beam includes a second surface, which is adjacent to the second sub-cavity;

[0022] The tensioning assembly is connected to the second surface.

[0023] Optionally, the control module includes electrical components connected to the second surface, and the electrical components and the tensioning assembly are spaced apart along the first direction.

[0024] Optionally, the tensioning assembly includes a connecting block and a tensioning member;

[0025] The connecting block is connected to the expansion beam;

[0026] The tensioning member extends along the second direction and is connected to the connecting block.

[0027] Optionally, the expansion beam is provided with a connecting groove, and the connecting block is disposed in the connecting groove and welded to the expansion beam;

[0028] The connecting groove and the reinforcing beam are spaced apart along the first direction.

[0029] Optionally, the housing includes two first sidewalls arranged opposite each other along the first direction and two second sidewalls arranged opposite each other along the second direction, the second sidewalls being connected to the first sidewalls, and the first sidewalls and the second sidewalls enclosing the receiving cavity;

[0030] There are at least two expansion beams, each expansion beam is connected to one of the two first sidewalls, and the at least two expansion beams are spaced apart along the second direction, and the connecting blocks on the at least two expansion beams are aligned along the second direction;

[0031] The tensioning member is connected to the connecting block on at least two of the expansion beams.

[0032] Optionally, the second sidewall and the expansion beam are spaced apart along the second direction;

[0033] There are multiple reinforcing beams, which are respectively connected to the second sidewall and the expansion beam.

[0034] Optionally, the expansion beam includes a first connecting portion and a second connecting portion;

[0035] The second connecting portion has a third surface, which is disposed close to the reinforcing beam. The first connecting portion is connected to the third surface, and one end of the second connecting portion away from the bottom of the receiving cavity extends beyond the first connecting portion.

[0036] The reinforcing beam is connected to the first connecting part;

[0037] The connecting block is connected to the end of the second connecting part away from the bottom of the receiving cavity.

[0038] Secondly, this application also discloses an electrical device comprising a battery pack as described in any of the preceding claims.

[0039] In this embodiment of the application, by setting the tensioning component connected to the expansion beam and the reinforcing beam at intervals along the first direction, interference between the tensioning component and the reinforcing beam on the expansion beam during the assembly process can be prevented, thereby reducing assembly difficulty and improving assembly efficiency.

[0040] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0041] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0042] Figure 1 This is a schematic diagram of the structure of a battery pack provided in an embodiment of this application;

[0043] Figure 2 This is a front view of a battery pack provided in an embodiment of this application;

[0044] Figure 3This is an exploded view of a battery pack provided in an embodiment of this application;

[0045] Figure 4 This is a cross-sectional view of a battery pack provided in an embodiment of this application;

[0046] Figure 5 This is a schematic diagram of another battery pack structure provided in an embodiment of this application;

[0047] Figure 6 This is a front view of another battery pack provided in an embodiment of this application;

[0048] Figure 7 This is an exploded view of another battery pack provided in an embodiment of this application;

[0049] Figure 8 This is a cross-sectional view of another battery pack provided in an embodiment of this application;

[0050] Figure 9 This is a structural schematic diagram of the reinforcing beam and expansion beam of a battery pack provided in an embodiment of this application.

[0051] Figure label:

[0052] 1 – Housing; 11 – Receiving cavity; 111 – First sub-cavity; 112 – Second sub-cavity; 12 – First side wall; 13 – Second side wall; 2 – Expansion beam; 21 – First surface; 22 – Second surface; 23 – Connecting groove; 24 – First connecting part; 25 – Second connecting part; 251 – Third surface; 3 – Reinforcing beam; 4 – Connecting block; 41 – Threaded hole; 5 – Tensioning component; 51 – Through hole; 6 – Battery module; 7 – Electrical component; 8 – Connecting bolt; 9 – Tensioning assembly; 10 – Control module; X – First direction; Y – Second direction. Detailed Implementation

[0053] The embodiments of this application will now be described in detail. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0054] The terms "first" and "second" in the specification and claims of this application may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise stated, "multiple" means two or more. Furthermore, "and / or" in the specification and claims indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0055] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0056] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0057] Battery packs, as an important power source for electrical equipment, are widely used in new energy vehicles, aerospace, and other technological fields. Currently, battery packs contain multiple battery cells. During charging and discharging, these cells expand. Expansion beams are installed inside the pack to resist the expansion forces of the cells during charging and discharging. Reinforcing beams connect the expansion beams to the pack body to improve the overall strength of the battery pack.

[0058] However, during the assembly of the expansion beam and the reinforcing beam, interference can easily occur between the reinforcing beam and the components connected to the expansion beam, increasing the assembly difficulty. To avoid interference, it is necessary to cut or shorten the size of the reinforcing beam, which reduces the structural strength and load-bearing capacity of the reinforcing beam. In addition, an additional avoidance structure is required, which is complex to process, thereby increasing manufacturing costs and process difficulty.

[0059] Based on the above analysis, this application provides a battery pack, which will be described in detail below with reference to the accompanying drawings.

[0060] Reference Figure 1 - Figure 9 The battery pack provided in this application embodiment has a first direction X and includes: a housing 1 having a receiving cavity 11; a battery module 6 disposed in the receiving cavity 11; an expansion beam 2 disposed in the receiving cavity 11 and connected to the housing 1; a reinforcing beam 3 disposed in the receiving cavity 11 and connected to the housing 1 and the expansion beam 2 respectively; and a tensioning assembly 9 extending along a second direction Y and connecting the battery module 6 and the expansion beam 2; wherein the tensioning assembly 9 and the reinforcing beam 3 are spaced apart along the first direction X.

[0061] Specifically, the first direction X is as follows: Figure 2 The first direction X is shown as the X-axis direction, and the second direction Y is shown as the Y-axis direction. The first direction X and the second direction Y intersect.

[0062] The housing 1 can be made of a metal material, such as aluminum alloy. The housing 1 has a receiving cavity 11, which provides space for the placement and arrangement of components inside the battery pack. The shape of the receiving cavity 11 can be cuboid, cylindrical, or other shapes, and this application does not specifically limit it.

[0063] The expansion beam 2 extends along the first direction X within the receiving cavity 11, and its two ends along the first direction X are fixedly connected to the housing 1, wherein the fixed connection methods include, but are not limited to, welding, screwing, and integral molding. The expansion beam 2 is used to connect to the battery module 6 to resist the expansion force generated by the battery module 6 during charging and discharging. The cross-sectional shape of the expansion beam 2 can be U-shaped, C-shaped, rectangular tubular, or a multi-cavity composite structure to improve load-bearing capacity while achieving lightweight design.

[0064] A reinforcing beam 3 is disposed inside the receiving cavity 11, extending along a second direction Y, wherein the second direction Y is perpendicular to the first direction X, or the angle between the second direction Y and the first direction X can be less than 90°. Both ends of the reinforcing beam 3 are fixedly connected to the housing 1 and the expansion beam 2, respectively, wherein the fixed connection methods include, but are not limited to, welding, screwing, and integral molding. The reinforcing beam 3 can be made of high-strength metal materials, such as high-strength steel or aluminum alloy extruded profiles, possessing high bending and torsional stiffness. The reinforcing beam 3 is used to enhance the strength of the expansion beam 2, preventing accidental deformation under non-collision conditions and improving the overall strength of the battery pack. The cross-sectional shape of the reinforcing beam 3 can be U-shaped, C-shaped, rectangular tubular, or a multi-cavity composite structure to improve load-bearing capacity while achieving lightweight design.

[0065] The connecting block 4 and the reinforcing beam 3 are spaced apart by a preset distance along the first direction X. In some embodiments, the preset distance is not less than 10mm to ensure that the two have sufficient installation space during assembly and reduce positional interference.

[0066] In this embodiment of the application, by setting the connecting block 4 on the expansion beam 2 and the reinforcing beam 3 at intervals along the first direction X, interference between the connecting block 4 on the expansion beam 2 and the reinforcing beam 3 during the assembly process can be prevented, thereby reducing assembly difficulty, improving assembly efficiency, maintaining the structural strength and load-bearing capacity of the reinforcing beam 3, and simplifying manufacturing, reducing manufacturing costs and process difficulty.

[0067] Optionally, the expansion beam 2 divides the receiving cavity 11 into a first sub-cavity 111 and a second sub-cavity 112; the battery pack includes a battery module 6 and a control module 10, the battery module 6 is disposed in the first sub-cavity 111 and connected to the expansion beam 2 and the housing 1; the control module 10 and the reinforcing beam 3 are disposed in the second sub-cavity 112, and the control module 10 is electrically connected to the battery module 6; the expansion beam 2 has a first surface 21, the first surface 21 is close to the first sub-cavity 111, and the tensioning assembly 9 is connected to the first surface 21.

[0068] Specifically, such as Figure 1 - Figure 4 As shown, the battery module 6 includes multiple battery cells, which are arranged in an array within the first sub-cavity 111. The multiple battery cells can be connected in series, parallel, or a combination thereof. A combination thereof means that some of the multiple battery cells are connected in series and others in parallel. The multiple battery cells can be directly connected in series, parallel, or a combination thereof, and then the battery module 6 composed of the multiple battery cells is housed within the housing cavity 11. The battery module 6 may also include a busbar component for realizing the electrical connection between the multiple battery cells.

[0069] The control module 10 is located within the second sub-cavity 112 and is electrically connected to the battery module 6. The control module 10 is used for signal transmission and energy management. For example, the control module 10 may include a high-voltage power distribution module and a battery management system. The battery management system may include a main control board and a slave control board, used for monitoring the status of the battery module 6, performing charge / discharge control, and implementing functions such as fault diagnosis and safety protection. In practical applications, because the control module 10 and the battery module 6 are arranged in different sub-cavities, physical isolation between the high-voltage power system and the low-voltage control system is achieved, which helps prevent safety hazards such as short circuits and leakage, and also facilitates later maintenance and replacement.

[0070] like Figure 2 As shown, the expansion beam 2 has a first surface 21, which is located near the first sub-cavity 111. The tensioning assembly 9 is connected to the first surface 21. This arrangement of the tensioning assembly 9 near the first sub-cavity 111 increases the distance between the tensioning assembly 9 and the reinforcing beam 3, further preventing interference between the tensioning assembly 9 and the reinforcing beam 3 during assembly. This further reduces assembly difficulty and reduces constraints on the design of the control module 10, thereby reducing the chain reaction impact on the overall battery pack design.

[0071] Optionally, the expansion beam 2 divides the receiving cavity 11 into a first sub-cavity 111 and a second sub-cavity 112; the battery pack includes a battery module 6 and a control module 10, the battery module 6 is disposed in the first sub-cavity 111 and connected to the expansion beam 2 and the housing 1; the control module 10 and the reinforcing beam 3 are disposed in the second sub-cavity 112, and the control module 10 is electrically connected to the battery module 6; the expansion beam 2 has a second surface 22, which is close to the second sub-cavity 112; the connecting block 4 is connected to the second surface 22.

[0072] Specifically, such as Figure 5 - Figure 8 As shown, the battery module 6 includes multiple battery cells, and the array of multiple battery cells is arranged in the first sub-cavity 111. The control module 10 is arranged in the second sub-cavity 112, and the control module 10 is electrically connected to the battery module 6. The control module 10 is used to realize signal transmission and energy management.

[0073] like Figure 6 As shown, the expansion beam 2 has a second surface 22, which is located close to the second sub-cavity 112. The tensioning assembly 9 is connected to the second surface 22. This arrangement of the tensioning assembly 9 close to the second sub-cavity 112 can reduce damage to the insulating film or other components of the battery module 6, reduce the occurrence of insulation failure and other problems, and thus improve the safety of the battery pack.

[0074] Optionally, the control module 10 includes an electrical component 7, which is connected to the second surface 22, and the electrical component 7 and the connecting block 4 are spaced apart along the first direction X.

[0075] Specifically, the electrical component 7 can be fixedly connected to the second surface 22 of the expansion beam 2 by means of welding, snap-fit, etc. For example, the electrical component 7 can be a slave control board of the battery management system, which is fixedly connected to the expansion beam 2.

[0076] In practical applications, by setting the electrical component 7 and the connecting block 4 at a certain distance along the first direction X, the electrical component 7 and the connecting block 4 can have sufficient assembly space during the assembly of the electrical component 7 and the connecting block 4 on the second surface 22 of the expansion beam 2, avoiding positional interference and further reducing the assembly difficulty.

[0077] In some alternative embodiments, the tensioning assembly 9 includes a connecting block 4 and a tensioning member 5, the connecting block 4 being connected to the expansion beam 2, the tensioning member 5 extending along the second direction Y, and the tensioning member 5 being connected to the connecting block 4.

[0078] like Figure 1 - Figure 8As shown, the connecting block 4 can be fixedly connected to the expansion beam 2 by welding, snap-fitting, or bonding. The connecting block 4 can be any shape, such as cuboid, sheet, or frustum. The material of the connecting block 4 can be metal, plastic, or other materials. The connecting block 4 is used to connect the tensioning member 5 and the expansion beam 2, and can disperse the local stress peaks applied to the expansion beam 2 by the tensioning member 5, thereby improving the strength of the expansion beam 2.

[0079] The tensioning component 5 can be fixedly connected to the connecting block 4 by means of bolts, welding, or other methods, and thus fixed to the expansion beam 2. The tensioning component 5 can be strip-shaped, sheet-shaped, block-shaped, or other shapes; the material of the tensioning component 5 can be metal, plastic, or other materials. The tensioning component 5 is connected to the expansion beam 2, enhancing the strength of the expansion beam 2 and improving the battery pack's resistance to expansion forces.

[0080] In some embodiments, the tensioning member 5 is fixed to the connecting block 4 by connecting bolts 8. Specifically, such as... Figure 3 and Figure 4 , Figure 5 and Figure 6 As shown, the connecting block 4 has a threaded hole 41 or a nut is embedded in the connecting block 4, and the tensioning member 5 has a through hole 51. When installing the tensioning member 5, the through hole 51 on the tensioning member 5 is opposite to the threaded hole 41 or nut on the connecting block 4, and then the connecting bolt 8 is passed through the through hole 51 and threaded into the threaded hole 41 or nut.

[0081] Optionally, the expansion beam 2 is provided with a connecting groove 23, and the connecting block 4 is disposed in the connecting groove 23 and welded to the expansion beam 2; wherein the connecting groove 23 and the reinforcing beam 3 are spaced apart along the first direction X.

[0082] Specifically, such as Figure 2 and Figure 3 , Figure 6 and Figure 7 As shown, the connecting groove 23 refers to the groove structure opened on the expansion beam 2. The shape of the connecting block 4 is adapted to the shape of the connecting groove 23 so that the connecting block 4 can be accommodated in the connecting groove 23.

[0083] It is understandable that, such as Figure 4 As shown, the connecting groove 23 is disposed near the first surface 21 of the expansion beam 2 and penetrates the first surface 21, so that the connecting block 4 is disposed near the first sub-cavity 111. Or as... Figure 6 As shown, the connecting groove 23 is disposed near the second surface 22 of the expansion beam 2 and is in communication with the second surface 22, so that the connecting block 4 is disposed near the second sub-cavity 112.

[0084] The connecting block 4 is housed within the connecting groove 23. The outer wall of the connecting block 4 can be fixedly connected to the inner wall of the connecting groove 23 by welding, bonding, or other means. In this way, the fixed wall of the connecting groove 23 can be connected to the connecting block 4 from multiple different directions. When the expansion beam 2 is subjected to the expansion force of the battery module 6, the force on the connecting block 4 can be dispersed to various directions of the expansion beam 2 through the inner wall of the connecting block 4 and the connecting groove 23. This can disperse the local stress peak applied to the expansion beam 2 by the tensioning member 5, thereby reducing the force at the connection between the connecting block 4 and the expansion beam 2 and increasing the stability of the connection between the connecting block 4 and the expansion beam 2.

[0085] The connecting block 4 is welded to the expansion beam 2. In practical applications, welding is a relatively robust connection method, which can improve the reliability of the connection between the connecting block 4 and the expansion beam 2. Furthermore, the connecting block 4 and the expansion beam 2 can be welded to the expansion beam 2 using a cold metal transfer (CMT) process. This effectively avoids the relative positional misalignment between the expansion beam 2 and the tensioning member 5 caused by welding thermal deformation. After welding, the weld seam needs to be ground so that it is lower than or flush with the upper surface of the connecting block 4 along its thickness direction. Grinding the weld seam helps increase the contact area between the tensioning member 5 and the connecting block 4, reducing the impact load directly transmitted to the threads.

[0086] Optionally, the housing 1 includes two first sidewalls 12 arranged opposite each other along a first direction X and two second sidewalls 13 arranged opposite each other along a second direction Y. The second sidewalls 13 are connected to the first sidewalls 12, and the first sidewalls 12 and the second sidewalls 13 enclose a receiving cavity 11. There are at least two expansion beams 2, which are respectively connected to the two first sidewalls 12, and the at least two expansion beams 2 are spaced apart along the second direction Y. The connecting blocks 4 on the at least two expansion beams 2 are aligned along the second direction Y. The tensioning members 5 are respectively connected to the connecting blocks 4 on the at least two expansion beams 2.

[0087] Specifically, the housing 1 can be composed of two first sidewalls 12 and two second sidewalls 13, the first sidewalls 12 and the second sidewalls 13 are arranged at an angle and can be connected to each other by welding or integral molding. The first sidewalls 12 and the second sidewalls 13 enclose and form a receiving cavity 11.

[0088] There can be 2, 3, 4, etc. The first sub-cavity 111 can be formed by enclosing two first sidewalls 12 and any two expansion beams 2. The second sub-cavity 112 can be formed by enclosing one second sidewall 13, two first sidewalls 12 and one expansion beam 2.

[0089] Each expansion beam 2 is fixedly connected to a connecting block 4, and the connecting blocks 4 on the expansion beam 2 are aligned along the second direction Y. In this way, the two ends of the tensioning member 5 along the second direction Y can be connected to the connecting blocks 4 on the two expansion beams 2 respectively, which can optimize the force transmission path, limit the deformation of the expansion beam 2, enhance the strength of the expansion beam 2, and thus improve the overall strength of the battery pack.

[0090] When there are multiple tensioning parts 5, there are also multiple connecting blocks 4.

[0091] Optionally, the second sidewall 13 and the expansion beam 2 are spaced apart along the second direction Y; there are multiple reinforcing beams 3, which are respectively connected to the second sidewall 13 and the expansion beam 2.

[0092] Specifically, multiple reinforcing beams 3, expansion beams 2, and the second sidewall 13 can be fixedly connected together by methods such as welding or riveting. Alternatively, the reinforcing beams 3, expansion beams 2, and the second sidewall 13 can be integrally formed structures; this embodiment does not specifically limit this.

[0093] For example, there can be 2, 3, 4, etc., and this application embodiment does not specifically limit this.

[0094] In this embodiment, by setting multiple reinforcing beams 3, which are connected to the expansion beam 2 and the second sidewall 13, the strength of the expansion beam 2 can be further improved, thereby further improving the overall rigidity of the battery pack.

[0095] Optionally, the expansion beam 2 includes a first connecting portion 24 and a second connecting portion 25 arranged at an angle; the second connecting portion 25 has a third surface 251, which is disposed near the reinforcing beam 3, the first connecting portion 24 is connected to the third surface 251, and one end of the second connecting portion 25 away from the bottom of the receiving cavity 11 extends beyond the first connecting portion 24; the reinforcing beam 3 is connected to the first connecting portion 24; and the connecting block 4 is connected to one end of the second connecting portion 25 away from the bottom of the receiving cavity 11.

[0096] Specifically, such as Figure 9 As shown, both the first connecting part 24 and the second connecting part 25 can be square tubular side beam structures. The second connecting part 25 has a third surface 251, which is located near the reinforcing beam 3. The first connecting part 24 is connected to the third surface 251. The end of the second connecting part 25 away from the bottom of the receiving cavity 11 extends beyond the first connecting part 24. The heights of the first connecting part 24 and the second connecting part 25 along the third direction Z are different, so that there is an angle between them. This angle can be 90°, so that the first connecting part 24 and the second connecting part 25 can be arranged in an L-shape.

[0097] The reinforcing beam 3 and the first connecting part 24 can be fixedly connected by welding, bolting or other means, and the connecting block 4 can be fixedly connected to the second connecting part 25 so that the connecting block 4 and the reinforcing beam 3 are spaced apart in the height direction.

[0098] In practical applications, by setting the first connecting part 24 and the second connecting part 25 at an angle, interference between the connecting block 4 and the reinforcing beam 3 during the assembly process can be further prevented, thereby reducing the assembly difficulty.

[0099] In summary, the battery pack provided in this application embodiment has at least the following advantages:

[0100] In this embodiment of the application, by setting the connecting block 4 on the expansion beam 2 and the reinforcing beam 3 at intervals along the first direction X, interference between the tensioning component 9 on the expansion beam 2 and the reinforcing beam 3 during the assembly process can be prevented, thereby reducing assembly difficulty, improving assembly efficiency, maintaining the structural strength and load-bearing capacity of the reinforcing beam 3, and simplifying manufacturing, reducing manufacturing costs and process difficulty.

[0101] This application also provides an electrical device, which includes the battery pack described in any of the above embodiments.

[0102] Battery packs can provide power to electrical devices, including but not limited to vehicles, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, and so on.

[0103] It should be noted that in this embodiment, the structure of the battery pack is the same as that of the battery pack described in any of the above embodiments, and its beneficial effects are similar, so it will not be described in detail here.

[0104] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0105] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A battery pack having intersecting first direction (X) and second direction (Y), characterized in that, The battery pack includes: The housing (1) has a receiving cavity (11); A battery module (6) is disposed within the receiving cavity (11); An expansion beam (2) extends along the first direction (X) and is disposed in the receiving cavity (11) and is connected to the box body (1); A reinforcing beam (3) extends along the second direction (Y) and is disposed in the receiving cavity (11), and the reinforcing beam (3) is connected to the box body (1) and the expansion beam (2) respectively; And a tensioning assembly (9) extending along the second direction (Y), and the tensioning assembly (9) connecting the expansion beam (2) and the battery module (6); The tensioning assembly (9) and the reinforcing beam (3) are spaced apart along the first direction (X).

2. The battery pack according to claim 1, characterized in that, The expansion beam (2) divides the receiving cavity (11) into a first sub-cavity (111) and a second sub-cavity (112); The battery pack also includes a control module (10), and the battery module (6) is disposed in the first sub-cavity (111) and connected to the expansion beam (2) and the housing (1); The control module (10) and the reinforcing beam (3) are disposed in the second sub-cavity (112), and the control module (10) is electrically connected to the battery module (6); The expansion beam (2) has a first surface (21) that is close to the first sub-cavity (111). The tensioning assembly (9) is connected to the first surface (21).

3. The battery pack according to claim 1, characterized in that, The expansion beam (2) divides the receiving cavity (11) into a first sub-cavity (111) and a second sub-cavity (112); The battery pack also includes a battery module (6) and a control module (10). The battery module (6) is disposed in the first sub-cavity (111) and is connected to the expansion beam (2) and the housing (1). The control module (10) and the reinforcing beam (3) are disposed in the second sub-cavity (112), and the control module (10) is electrically connected to the battery module (6); The expansion beam (2) has a second surface (22) which is close to the second sub-cavity (112); The tensioning assembly (9) is connected to the second surface (22).

4. The battery pack according to claim 3, characterized in that, The control module (10) includes an electrical component (7) connected to the second surface (22), and the electrical component (7) and the tensioning assembly (9) are spaced apart along the first direction (X).

5. The battery pack according to claim 1, characterized in that, The tensioning assembly (9) includes a connecting block (4) and a tensioning member (5); The connecting block (4) is connected to the expansion beam (2); The tensioning member (5) extends along the second direction (Y) and is connected to the connecting block (4).

6. The battery pack according to claim 5, characterized in that, The expansion beam (2) is provided with a connecting groove (23), and the connecting block (4) is disposed in the connecting groove (23) and welded to the expansion beam (2); The connecting groove (23) and the reinforcing beam (3) are spaced apart along the first direction (X).

7. The battery pack according to claim 5, characterized in that, The housing (1) includes two first sidewalls (12) arranged opposite to each other along the first direction (X) and two second sidewalls (13) arranged opposite to each other along the second direction (Y). The second sidewalls (13) are connected to the first sidewalls (12), and the first sidewalls (12) and the second sidewalls (13) enclose the receiving cavity (11). There are at least two expansion beams (2), each expansion beam (2) is connected to two of the first sidewalls (12), and at least two expansion beams (2) are spaced apart along the second direction (Y), and the connecting blocks (4) on at least two expansion beams (2) are aligned along the second direction (Y); The tensioning member (5) is connected to the connecting block (4) on at least two of the expansion beams (2).

8. The battery pack according to claim 7, characterized in that, The second sidewall (13) and the expansion beam (2) are spaced apart along the second direction (Y); There are multiple reinforcing beams (3), and the reinforcing beams (3) are respectively connected to the second side wall (13) and the expansion beam (2).

9. The battery pack according to any one of claims 1-8, characterized in that, The expansion beam (2) includes a first connecting part (24) and a second connecting part (25); The second connecting part (25) has a third surface (251) which is disposed near the reinforcing beam (3), the first connecting part (24) is connected to the third surface (251), and one end of the second connecting part (25) away from the bottom of the receiving cavity (11) extends beyond the first connecting part (24); The reinforcing beam (3) is connected to the first connecting part (24); The tensioning assembly (9) is connected to one end of the second connection (25) away from the bottom of the receiving cavity (11).

10. An electrical appliance, characterized in that, The electrical device includes a battery pack as described in any one of claims 1-9.

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