Preformed assembly, battery pack and electric device

Abstract

The utility model provides a preformed assembly, a battery pack and an electric device. The preformed assembly comprises a fin, a row of battery cells and a limiting structure, each fin comprises two attaching faces. The two binding faces are oppositely arranged in the first direction. And the battery cell is bonded on one of the bonding surfaces. The fin can further comprise two connecting ends, and the two connecting ends are the two ends of the fin in the second direction respectively. And the two connecting ends are fixedly connected in a box body of the battery pack. The limiting structure comprises two check blocks arranged in the box body. The plurality of preformed assemblies are sequentially arranged along a first direction and are fixed to form a battery module, and the two stop blocks are used for limiting the movement of the battery module in the first direction. The battery module is limited and fixed in the second direction and the first direction, so that displacement or shaking of each column of battery cells in the battery module and the battery module in the box body of the battery pack is avoided, the assembly reliability of the battery module is improved, and the assembly quality of the battery pack is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a pre-assembly component, a battery pack and a power utilization device. BACKGROUND

[0002] The battery module can include multiple columns of battery cells stacked in the same direction. In the assembly process of the battery pack, one or several columns of battery cells are taken as the minimum assembly unit, and all the battery cells are placed in the box to complete the assembly in the box body of the battery pack, thereby forming the battery module.

[0003] In the related art, the multiple columns of battery cells will displace or shake in the box body before the assembly of the battery module is completed, which affects the reliability of the assembly of the battery module, thereby affecting the assembly quality of the battery pack. UTILITY MODEL CONTENT

[0004] The present application provides a pre-assembly component, a battery pack and a power utilization device, which reduces the assembly difficulty of the battery module and reduces the time cost of the assembly.

[0005] In a first aspect, the present application provides a pre-assembly component, which includes a fin, a column of battery cells and a limiting structure. The fin includes two adhering surfaces. The two adhering surfaces are oppositely arranged along a first direction. The first direction is the length direction of the battery pack. The battery cells are adhered to one of the adhering surfaces. The fin can further include two connecting ends, which are the two ends of the fin in a second direction. The second direction is perpendicular to the first direction. The two connecting ends are fixedly connected in the box body of the battery pack. The limiting structure includes two stop blocks arranged in the box body. The two stop blocks are arranged along the first direction and there is a first installation space between the two stop blocks. Multiple pre-assembly components are sequentially arranged and fixed in the first installation space along the first direction. All the pre-assembly components in the first installation space form a battery module, and the two stop blocks are used to limit the movement of the battery module in the first direction.

[0006] According to the first aspect, the pre-assembly component is the minimum assembly unit of the battery module. The pre-assembly component can include a column of battery cells and a fin, wherein the column of battery cells is adhered to the adhering surface of the fin. The two connecting ends of the fin arranged along the second direction are fixedly connected in the box body of the battery pack, which is used to limit and fix the battery module in the second direction. The limiting structure in the box body of the battery pack includes two stop blocks arranged along the first direction, and each column of battery cells is arranged between the two stop blocks along the first direction to form the battery module, which is used to limit and fix the battery module in the first direction. The limitation and fixation of the battery module in the second direction and the first direction avoid the displacement or shaking of each column of battery cells in the battery module and the battery module in the box body of the battery pack, which improves the reliability of the assembly of the battery module, thereby improving the assembly quality of the battery pack.

[0007] In a possible design, the fins can be profiled plates. The profiled plates can include one or more cavity structures.

[0008] Based on the description of the above embodiments, the profiled plates can reduce the weight of the fins, thereby reducing the material cost. Further, the cavity structures in the profiled plates can also circulate external air for cooling the battery cells.

[0009] In a possible design, the cavity structure is in communication with the current collector pipe in the battery pack.

[0010] Based on the description of the above embodiments, the cavity structure is in communication with the current collector pipe in the battery pack, which can increase multiple cold plates in the thermal management system of the battery pack, thereby improving the cooling efficiency of the thermal management system to meet the cooling requirements of the 4C battery.

[0011] In a possible design, the pre-assembled component can further include two first connectors. The two first connectors are respectively arranged at the two connecting ends, and are used to fix the two connecting ends in the box. The first connector is a “Ji” type connecting piece. The “Ji” type connecting piece includes a clamping groove and a fixing plate. The clamping groove is clamped on the fin, and the fixing plate is connected in the box.

[0012] Based on the description of the above embodiments, the first connector arranged at the two connecting ends is a “Ji” type connecting piece. The “Ji” type connecting piece has a clamping groove and a fixing plate, which can fix the fin in the box, so that the pre-assembled component is fixed in the box.

[0013] In a second aspect, the application provides a battery pack, including: a box and a plurality of pre-assembled components according to any one of the above claims. The plurality of pre-assembled components are arranged in the box along a first direction to form a battery module.

[0014] In a possible design, the box can include a first structural beam, a second structural beam and a mounting plate. The first structural beam and the second structural beam are arranged in sequence along the first direction. The first structural beam and the second structural beam are both configured as the stopper in the pre-assembled component. The mounting plate is connected at the bottom of the first structural beam and the second structural beam, and is used to support the battery module.

[0015] Based on the description of the above embodiments, the first structural beam and the second structural beam in the box are configured as the stopper in the pre-assembled component, which reduces the parts in the battery pack and reduces the production cost of the battery pack.

[0016] In a possible design, the box can further include a third structural beam and a fourth structural beam arranged oppositely in a second direction. The length direction of the third structural beam and the fourth structural beam is the first direction. One end of the second structural beam is detachably connected to the third structural beam. The other end of the second structural beam is detachably connected to the fourth structural beam.

[0017] Based on the description of the above embodiment, one end of the second structural beam is detachably connected to the third structural beam, and one end of the second structural beam is detachably connected to the fourth structural beam, so that the size of the first mounting space can be changed to adapt to battery modules of different specifications, thereby making the battery pack universal.

[0018] In a possible design, the box body can further include two second connecting pieces. The second connecting pieces are L-shaped connecting plates. One of the second connecting pieces is used to connect the second structural beam and the third structural beam, and the other second connecting piece is used to connect the second structural beam and the fourth structural beam.

[0019] Based on the description of the above embodiment, the second structural beam is connected to the third structural beam and the fourth structural beam through the L-shaped connecting plates, thereby ensuring the reliability of the connection relationship between the second structural beam and the third structural beam and the fourth structural beam.

[0020] In a possible design, the second connecting piece is provided with a reinforcing rib.

[0021] Based on the description of the above embodiment, the reinforcing rib is used to improve the structural strength of the second connecting piece, thereby improving the reliability of the connection.

[0022] In a third aspect, the application provides a power consumption device, comprising the battery pack in any one of the above embodiments. The battery pack is used to provide electric energy.

[0023] The battery pack provided in the second aspect and the power consumption device provided in the third aspect have the beneficial effects of the first aspect and the possible implementation manners of the first aspect, which will not be described here. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor.

[0025] Figure 1 It is a structural schematic view of a pre-assembled component in an embodiment of the application.

[0026] Figure 2 It is a structural schematic view of a box body in an embodiment of the application.

[0027] Figure 3 It is a structural schematic view of a box body in an embodiment of the application. Figure 2 It is an enlarged view of part A in FIG.

[0028] Figure 4 It is another angle view of FIG. Figure 1 ​

[0029] Figure 5 is Figure 2 Another view of the other angle.

[0030] Figure 6 is Figure 5 Enlarged view of part B in

[0031] BRIEF DESCRIPTION OF DRAWINGS

[0032] 1 - pre-assembly;

[0033] 11 - fin; 112 - cavity structure;

[0034] 12 - a row of cells;

[0035] 13 - first connecting piece; 131 - clamping groove; 132 - fixed plate;

[0036] 2 - box;

[0037] 21 - first structural beam (stop); 22 - second structural beam (stop); 23 - third structural beam; 24 - four structural beam;

[0038] 25 - second connecting piece; 251 - reinforcing rib;

[0039] 3 - battery module;

[0040] X - first direction; Y - second direction; Z - third direction. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the technical scheme in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are some embodiments of the present application, not all embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0042] 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 terminology used in the description herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application.

[0043] The terms "comprising" and "having", and any variations thereof, used in the specification and claims of the present application, are intended to cover both the case where the recited elements are present and the case where the recited elements are not present. The word "a" or "an" does not exclude the presence of more than one.

[0044] Reference to "an embodiment" herein 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 an embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily all referring to a common embodiment, or an embodiment that is independent of all other embodiments. One of ordinary skill in the art will recognize that an implementation including "an embodiment" encompasses one or more implementations that include "an embodiment".

[0045] The term "and / or", merely describes association relationship of associated objects, and means that three relationships can exist, for example, A and / or B can mean that A exists alone, A and B exist together, and B exists alone. In addition, the character " / " in the present application generally represents an "or" relationship between the front and rear associated objects.

[0046] The orientation words appearing in the following description are the directions shown in the drawings, and are not limited to the specific structure of the application. For example, in the description of the application, the 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 based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the application.

[0047] In addition, the expressions of the indicating directions for describing the operation and structure of each component of the embodiments, such as X direction, Y direction and Z direction, are not absolute but relative, and although these indications are appropriate when each component is in the position shown in the drawings, these directions should be interpreted differently to correspond to the changes when these positions change.

[0048] In addition, the terms "first", "second", and the like in the specification and claims of the application or the above drawings are used to distinguish different objects, and are not used to describe a particular order, and can explicitly or implicitly include one or more of the features.

[0049] In the description of the application, unless otherwise specified, the meaning of "a plurality of" is two or more (including two), and similarly, "a plurality of groups" means two or more groups (including two groups).

[0050] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting" should be understood in a broad sense, for example, the "connection" or "connecting" of mechanical structures can mean physical connection, for example, the physical connection can be fixed connection, for example, fixed connection by screws, bolts or other fixing members; the physical connection can also be detachable connection, for example, mutual clamping or clamping connection; the physical connection can also be integrally connected, for example, welding, bonding or integrally formed connection. The "connection" or "connecting" of circuit structures can mean not only physical connection, but also electrical connection or signal connection, for example, it can be direct connection, that is, physical connection, or indirect connection through at least one intermediate element, as long as the circuit is connected, it can also be the connection between two elements; signal connection can not only be signal connection through circuit, but also signal connection through media medium, for example, radio wave. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0051] The battery module can include a plurality of columns of battery cells stacked in the same direction. During assembly of the battery pack, one or several columns of battery cells are taken as the minimum assembly unit, and all the battery cells are placed in the box to complete the assembly in the box of the battery pack, thereby forming the battery module.

[0052] In the related art, during assembly of the battery module, the plurality of columns of battery cells will be displaced or shaken in the box, affecting the reliability of the assembly of the battery module, thereby affecting the assembly quality of the battery pack.

[0053] Therefore, the present application provides a pre-assembly component, a battery pack and a power utilization device, which divides the columns of battery cells in the battery module into a plurality of pre-assembly components, and fixes the pre-assembly components in the battery pack respectively, so as to prevent the displacement or shaking of the battery cells in the box, thereby realizing the accurate installation of the columns of battery cells in the battery module and the battery module in the box, reducing the assembly difficulty of the battery module and the time cost of the assembly. The present application will be described in detail below. Figures 1-6

[0054] ​In a first aspect, the application provides a pre-assembled component 1 applied to a battery pack. The pre-assembled component 1 can include a fin 11, a row of battery cells 12, and a limiting structure. The fin 11 includes two bonding surfaces. The two bonding surfaces are oppositely arranged along a first direction X. The first direction X is the length direction of the battery pack. The battery cells are bonded to one of the bonding surfaces. The fin 11 can further include two connecting ends, which are the two ends of the fin 11 in a second direction Y. The second direction Y is perpendicular to the first direction X. The two connecting ends are fixedly connected in the box 2 of the battery pack. The limiting structure includes two stop blocks arranged in the box 2. The two stop blocks are arranged along the first direction X and there is a first installation space between the two stop blocks. A plurality of pre-assembled components 1 are sequentially arranged and fixed in the first installation space along the first direction X. All the pre-assembled components 1 in the first installation space form a battery module 3. The two stop blocks are used to limit the movement of the battery module 3 in the first direction X.

[0055] As shown in Figure 1 , a pre-assembled component 1 can include a row of battery cells 12 and a fin 11.

[0056] The fin 11 can be a long strip-shaped plate structure. The length of the fin 11 is matched with the length of the row of battery cells 12.

[0057] Specifically, the fin 11 can include two bonding surfaces oppositely arranged along the first direction X. The battery cells are bonded to one of the bonding surfaces. The pre-assembled component 1 formed by the row of battery cells 12 and the fin 11 becomes the smallest assembly unit of the battery module 3.

[0058] Further, the fin 11 can further include two connecting ends oppositely arranged along the second direction Y. The second direction Y is perpendicular to the first direction X. The two connecting ends are fixedly connected in the box 2 of the battery pack. The limiting and fixing of the pre-assembled component 1 in the second direction Y can be achieved. It is obvious that when each pre-assembled component 1 in the battery module 3 can achieve the limiting and fixing in the second direction Y, the battery module 3 can also achieve the limiting and fixing in the second direction Y.

[0059] In order to further achieve the limiting of the pre-assembled component 1, the box 2 of the battery pack can further include a limiting structure. The limiting structure includes two stop blocks. The stop blocks can be structural beams in the box 2. The two stop blocks are arranged along the first direction X and there is a first installation space between the two stop blocks. A plurality of pre-assembled components 1 are sequentially arranged and fixed in the first installation space along the first direction X, so that all the pre-assembled components 1 in the first installation space form a battery module 3. The two stop blocks are used to limit the movement of the battery module 3 in the first direction X, and the limiting and fixing of all the pre-assembled components 1 in the first direction X can be achieved. That is, the limiting and fixing of the battery module 3 in the first direction X can be achieved.

[0060] Specifically, one of the two stoppers is used to limit the movement of the preformed assembly 1 abutting thereto in one direction, and the other stopper is used to limit the movement of the preformed assembly 1 abutting thereto in the other direction. Figure 2 It can be seen that the two preformed assemblies 1 abutting the two stoppers are the preformed assemblies 1 at the two side edges of the battery module 3 in the first direction X.

[0061] It can be seen from the above that the preformed assembly 1 can be limited and fixed in the second direction Y and the first direction X, so as to avoid the displacement or shaking of each row of battery cells in the battery module 3 and the battery module 3 in the box 2, and improve the reliability of the assembly of the battery module 3.

[0062] In summary, the preformed assembly 1 is the smallest assembly unit of the battery module 3. The preformed assembly 1 can include one row of battery cells 12 and one fin 11, wherein the row of battery cells 12 is bonded to the bonding surface of the fin 11. The two connecting ends of the fin 11 arranged in the second direction Y are fixedly connected in the box 2 of the battery pack, for limiting and fixing the battery module 3 in the second direction Y. The limiting structure in the box 2 of the battery pack includes two stoppers arranged in the first direction X, and each row of battery cells arranged in the first direction X to form the battery module 3 is arranged between the two stoppers, for limiting and fixing the battery module 3 in the first direction X. The limiting and fixing of the battery module 3 in the second direction Y and the first direction X avoid the displacement or shaking of each row of battery cells in the battery module 3 and the battery module 3 in the box 2 of the battery pack, and improve the reliability of the assembly of the battery module 3, thereby improving the assembly quality of the battery pack.

[0063] In some embodiments, as shown in FIG. 1, the fin 11 can be a profiled plate. The profiled plate includes one or more cavity structures 112. Figure 3

[0064] Based on the description of the above embodiments, the profiled plate can reduce the weight of the fin 11, thereby reducing the material cost. Further, the cavity structure 112 in the profiled plate can also circulate external air, for cooling the battery cells.

[0065] In the existing market, 2C batteries and 4C batteries are common specifications. Among them, the charge rate of the 4C battery is greater than that of the 2C battery. For example, the 2C battery can be fully charged in 30 minutes, while the 4C battery can be fully charged in 15 minutes. The difference in the above charging speed has different requirements for the thermal management system of the battery.

[0066] Specifically, as the charge rate increases, the heat generated by the battery per unit time also increases accordingly. Therefore, the 4C battery generates more heat during charging than the 2C battery, and therefore requires a thermal management system with higher cooling efficiency to maintain the working temperature of the battery within a safe range.​

[0067] Based on the above problems, and in combination with Figure 1 It can be known that the cooling requirement of the 4C battery is also improved as follows in the application.

[0068] In some embodiments, the cavity structure 112 is in communication with a current collecting pipe (not shown in the figure) in the battery pack.

[0069] The current collecting pipe belongs to the thermal management system of the battery and is used to realize the circulation of the cooling liquid in the battery pack. When the cavity structure 112 is in communication with the current collecting pipe, the cooling liquid can flow into the cavity in the fin 11, so that the fin 11 can serve as a cold plate of the battery cell and join the circulation.

[0070] Based on the above description, the cavity structure 112 in communication with the current collecting pipe in the battery pack can increase the number of cold plates in the thermal management system of the battery pack, thereby improving the cooling efficiency of the thermal management system to realize the cooling requirement of the 4C battery.

[0071] It should be noted that the fin 11 can be a solid plate or a profiled plate. The solid plate can be suitable for a 2C battery, and the profiled plate can use a 2C or 4C battery. The operator can select and match according to the requirement.

[0072] In some embodiments, the pre-assembled component 1 can further include two first connecting pieces 13. The two first connecting pieces 13 are respectively arranged at the two connecting ends. The two first connecting pieces 13 are used to fix the two connecting ends in the box body 2. The first connecting piece 13 is a “j” type connecting piece. The “j” type connecting piece includes a clamping groove 131 and a fixing plate 132. The clamping groove 131 is clamped on the fin 11, and the fixing plate 132 is connected in the box body 2.

[0073] As shown in Figure 3 and Figure 4 The “j” type connecting piece can include the clamping groove 131 and two fixing plates 132. The two fixing plates 132 are respectively connected on both sides of the clamping groove 131 along the first direction X. The clamping direction of the clamping groove 131 is the third direction Z. The third direction Z can be perpendicular to the first direction X and the second direction Y.

[0074] In order to facilitate understanding, all the above three directions are presented on the fin 11. It can be concluded that the first direction X is the thickness direction of the fin 11, the second direction Y is the length direction of the fin 11, and the third direction Z is the height direction of the fin 11.

[0075] Based on the above content, it can be understood that the clamping groove 131 of the "ji" - shaped connecting piece is clamped at the connecting end of the fin 11 along the height direction of the fin 11, restricting the movement of the fin 11 within the clamping groove 131. The fixing plate 132 is connected to the box body 2, fixing the clamping groove 131 in the box body 2, and further fixing the fin 11 in the box body 2.

[0076] Based on the description of the above embodiment, the first connecting piece 13 provided at the two connecting ends is a "ji" - shaped connecting piece. The "ji" - shaped connecting piece having the clamping groove 131 and the fixing plate 132 can fix the fin 11 in the box body 2, thereby fixing the pre - formed component 1 in the box body 2.

[0077] In a second aspect, the present application provides a battery pack, including: a box body 2 and a plurality of pre - formed components 1 as described in any one of the above claims. The plurality of pre - formed components 1 are arranged in the box body 2 along the first direction X to form a battery module 3.

[0078] In some embodiments, the box body 2 may include a first structural beam 21, a second structural beam 22, and a mounting plate. The first structural beam 21 and the second structural beam 22 are arranged in sequence along the first direction X. Both the first structural beam 21 and the second structural beam 22 are configured as stoppers in the pre - formed component 1. The mounting plate is connected to the bottoms of the first structural beam 21 and the second structural beam 22 for supporting the battery module 3.

[0079] A structural beam is a basic element for carrying and transmitting loads. The functions of the structural beam in the battery box body 2 may include: providing structural support, enhancing safety protection, optimizing space layout, and improving the modularization and standardization of components within the battery pack.

[0080] Specifically, as Figure 2 shown, the box body 2 may include a first structural beam 21, a second structural beam 22, a third structural beam 23, a fourth structural beam 24, and a fifth structural beam.

[0081] The first structural beam 21, the second structural beam 22, and the fifth structural beam are arranged in the first direction X in sequence, and the second structural beam 22 is located between the first structural beam 21 and the fifth structural beam. The third structural beam 23 and the fourth structural beam 24 are arranged in the second direction Y in sequence. The two ends of the first structural beam 21, the second structural beam 22, and the fifth structural beam are respectively overlapped on the third structural beam 23 and the fourth structural beam 24. And the two ends of the third structural beam 23 and the fourth structural beam 24 are respectively overlapped on the first structural beam 21 and the fifth structural beam. According to the above content, it can be known that the first structural beam 21, the third structural beam 23, the fourth structural beam 24, and the fifth structural beam can be four edge beams of the battery pack. The second structural beam 22 divides the battery pack into a first installation space and a second installation space arranged in the first direction X. The first installation space is used for installing the battery module 3, and the second space can be used for installing the battery management system and other components in the battery pack. In addition, the mounting plate is connected to the bottom of the first structural beam 21, the second structural beam 22, the third structural beam 23, the fourth structural beam 24, and the fifth structural beam, which can provide installation positions for the battery module 3 in the battery pack and other components in the battery pack such as the battery management system.

[0082] Based on the description of the above embodiment, the first structural beam 21 and the second structural beam 22 in the box body 2 are configured as the stop blocks of the pre-assembled component 1, which reduces the components in the battery pack and reduces the production cost of the battery pack.

[0083] In some embodiments, as shown in Figure 2 The box body 2 can further include the third structural beam 23 and the fourth structural beam 24 arranged opposite in the second direction Y. The length direction of the third structural beam 23 and the fourth structural beam 24 is the first direction X. One end of the second structural beam 22 is detachably connected to the third structural beam 23. The other end of the second structural beam 22 is detachably connected to the fourth structural beam 24.

[0084] Based on the description of the above embodiment, one end of the second structural beam 22 is detachably connected to the third structural beam 23, and the other end of the second structural beam 22 is detachably connected to the fourth structural beam 24, so that the size of the first installation space can be changed to adapt to battery modules 3 of different specifications, thereby making the battery pack have universality.

[0085] In some embodiments, as shown in Figure 5 and Figure 6 The box body 2 can further include two second connecting pieces 25. The second connecting piece 25 is an L-shaped connecting sheet. One of the second connecting pieces 25 is used to connect the second structural beam 22 and the third structural beam 23, and the other second connecting piece 25 is used to connect the second structural beam 22 and the fourth structural beam 24.

[0086] Specifically, the L-shaped connecting piece can include a first adapter plate and a second adapter plate. The first adapter plate is perpendicular to the second adapter plate.

[0087] The first adapter plate is welded with the second structural beam 22, and the second adapter plate is detachably connected with the third structural beam 23, so as to realize the detachable connection of the second structural beam 22.

[0088] According to the description of the above embodiment, the second structural beam 22 is connected with the third structural beam 23 and the fourth structural beam 24 through the L-shaped connecting piece, so as to ensure the reliability of the connection relationship between the second structural beam 22 and the third structural beam 23 and the fourth structural beam 24.

[0089] In some embodiments, the second connecting piece 25 is provided with a reinforcing rib 251.

[0090] According to the description of the above embodiment, the reinforcing rib 251 is used to improve the structural strength of the second connecting piece 25, so as to improve the reliability of the connection.

[0091] In a third aspect, the application provides a power utilization device, comprising the battery pack in any one of the above embodiments. The battery pack is used to provide electric energy.

[0092] Those skilled in the art can understand that although some embodiments herein include certain features included in other embodiments rather than other features, the combination of features of different embodiments means to be within the scope of the application and form different embodiments. For example, in the claims, any one of the claimed embodiments can be used in any combination.

[0093] The above description is only used to illustrate the technical solutions of the application, and is not limited thereto; although the application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can still be modified, or some technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the application.

Claims

1. A preassembled component, characterized by, Applied to a battery pack, the prefabricated component includes: fins, a row of battery cells, and a limiting structure; The fin includes two mating surfaces; The two mating surfaces are arranged opposite to each other in the first direction; Wherein, the first direction is the length direction of the battery pack; The battery cell is bonded to one of the mating surfaces; The fin further includes two connecting ends, and the two connecting ends are respectively the two ends of the fin in the second direction; Wherein, the second direction is perpendicular to the first direction; Both of the two connecting ends are fixedly connected to the inside of the box body of the battery pack; The limiting structure includes two stoppers arranged inside the box body; The two stoppers are arranged along the first direction and there is a first installation space between the two stoppers; Multiple prefabricated components are arranged in sequence along the first direction and fixed in the first installation space; All the prefabricated components in the first installation space form a battery module, and the two stoppers are used to limit the movement of the battery module in the first direction.

2. The preassembled component of claim 1, wherein, The fin is a profiled plate; One or more cavity structures are included in the profiled plate; 3. The preassembled component of claim 2, wherein, The cavity structure is communicated with the current collector pipe in the battery pack; 4. The preassembled component of claim 1, wherein, Two first connecting pieces are further included; The two first connecting pieces are respectively arranged at the two connecting ends and are used to fix the two connecting ends in the box body; The first connecting piece is a "U"-shaped connecting piece; The "U"-shaped connecting piece includes a clamping groove and a fixing plate; The clamping groove is clamped on the fin, and the fixing plate is connected to the box body.

5. A battery pack, characterized by, Includes: A box body and multiple prefabricated components according to any one of claims 1-4; Multiple prefabricated components are arranged in the box body along the first direction to form a battery module.

6. The battery pack of claim 5, wherein, The box body includes a first structural beam, a second structural beam, and a mounting plate; The first structural beam and the second structural beam are arranged in sequence along the first direction; Both the first structural beam and the second structural beam are configured as the stoppers in the prefabricated component; The mounting plate is connected to the bottoms of the first structural beam and the second structural beam and is used to support the battery module.

7. The battery pack of claim 6, wherein, The box body further includes a third structural beam and a fourth structural beam arranged opposite to each other in the second direction; And the length directions of both the third structural beam and the fourth structural beam are the first direction; One end of the second structural beam is detachably connected to the third structural beam; The other end of the second structural beam is detachably connected to the fourth structural beam.

8. The battery pack of claim 7, wherein, Two second connecting pieces are further included in the box body; The second connecting piece is an L-shaped connecting piece; One of the second connecting pieces is used to connect the second structural beam and the third structural beam, and the other second connecting piece is used to connect the second structural beam and the fourth structural beam.

9. The battery pack of claim 8, wherein, Reinforcing ribs are arranged on the second connecting piece.

10. An electrical device, characterized by Includes the battery pack according to any one of claims 5-8; The battery pack is used to provide electric energy.

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