A battery pack bottom guard plate trial production connecting structure

Abstract

The utility model relates to a kind of battery pack bottom fender trial production connecting structure, comprising: bottom fender, convex piece, several convex pieces are set in the edge of bottom fender and with bottom fender by welding mode mechanical connection;Bottom fender is provided with several notched parts, the shape and quantity of convex piece and notched part are adapted, and convex piece is mechanically connected notched part by welding mode in notched part position.The structure and connecting mode design of bottom fender and convex piece of battery pack are improved, compared with traditional scheme bottom fender, the strength and function of bottom fender are not weakened, and the cost is far lower than the development cost of traditional bottom fender mold, the scheme cost of the utility model embodiment is more optimal, the development cycle is shortened, and it is more suitable for the trial production development demand of multi-specification type battery pack bottom fender.

Description

Technical Field

[0001] This utility model belongs to the field of power battery technology and relates to a prototype connection structure for a battery pack bottom protection plate. Background Technology

[0002] With the rapid development of new energy vehicle manufacturing technology, the application of power batteries in new energy vehicles is becoming increasingly widespread. The increasing demands on the range and safety of new energy vehicles necessitate continuous improvements to the battery pack bottom protection plate structure. The battery pack bottom protection plate primarily serves to protect the bottom of the battery, and secondarily provides a degree of sealing and improves the ride comfort inside the vehicle. Traditional battery bottom protection plates are manufactured using a one-piece stamping process, where the steel plate is formed in a single mold. This process is fast and advantageous when product models are stable and mass production is feasible. However, the high cost of the molds diminishes this advantage when frequent design changes to new or old models are required. Mold modifications involve lengthy cycles, extending the overall battery pack development cycle and resulting in higher overall project costs.

[0003] The traditional method for installing battery bottom protection plates involves using bolts, which are screwed into rivet nuts pre-embedded in the lower casing of the battery to fix the bottom protection plate to the bottom of the battery pack. For example... Figure 1 and Figure 2 As shown, the battery bottom cover plate has a structure with numerous protrusions along its edge. This is to prevent interference with the screw heads used to mount the liquid cooling plate. Since the liquid cooling plate is typically only about 2mm thick, it's impossible to make the screw heads countersunk; therefore, the protrusions are necessary. When the dimensions of the battery pack's lower casing or the liquid cooling plate are adjusted, the number or position of the screws used to mount the liquid cooling plate changes, requiring corresponding modifications to the protrusions along the bottom cover plate's edge. This necessitates changes to the bottom cover plate mold. Because molds are expensive and have long production cycles, this increases the company's economic costs and limits the frequency of battery pack modifications, hindering innovative development in battery structure. Utility Model Content

[0004] The purpose of this utility model is to provide a prototype connection structure for a battery pack bottom guard plate. By improving the design of the structure and connection method of the battery pack bottom guard plate and the protruding part, the research and development cost is reduced and the research and development cycle is shortened.

[0005] To achieve the above objectives, an embodiment of this utility model provides a prototype connection structure for a battery pack bottom guard plate, comprising: a bottom guard plate and protruding parts, wherein a plurality of the protruding parts are disposed on the edge of the bottom guard plate and mechanically connected to the bottom guard plate by welding; the bottom guard plate is provided with a plurality of notches, the protruding parts are adapted to the shape and number of the notches, and the protruding parts are mechanically connected to the notches at the notch positions by welding.

[0006] Furthermore, the convex part includes: a first connecting surface, a second connecting surface, and a third connecting surface. The first connecting surface, the second connecting surface, and the third connecting surface are respectively disposed on the side of the convex part and form a cavity. The convex part is mechanically connected to the bottom guard plate by welding at the corresponding notch positions through the first connecting surface, the second connecting surface, and the third connecting surface.

[0007] Furthermore, the height of the cavity is greater than the height of the screw head to accommodate the screw head.

[0008] Optionally, the welding method is either spot welding or laser welding.

[0009] This utility model relates to a prototype connection structure for a battery pack bottom protector. The advantages are as follows: the structure of this utility model embodiment is simple and reasonable. Addressing the rapid design needs of new energy vehicle battery packs, by improving the structure and connection method of the battery pack bottom protector and the protruding parts, compared to traditional bottom protector solutions, the strength and function of the bottom protector are not weakened. The increased costs of molds, laser cutting, and welding for the protruding parts are far lower than the development costs of traditional bottom protector molds. This utility model embodiment offers a more cost-effective solution, shortens the R&D cycle, and is more suitable for the prototype development needs of bottom protectors for multi-specification battery packs. Attached Figure Description

[0010] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings of the embodiments will be briefly introduced below. Obviously, the drawings described below only involve some embodiments of this utility model, and are not intended to limit this utility model.

[0011] Figure 1 A schematic diagram of the connection structure of the original bottom guard plate of the battery pack provided in an embodiment of this utility model;

[0012] Figure 2 This is a schematic diagram of a partial assembly state of the connection structure of the original bottom guard plate of a battery pack, provided in an embodiment of the present utility model.

[0013] Figure 3 One of the schematic diagrams of a prototype connection structure for a battery pack bottom guard plate provided in this embodiment of the present invention;

[0014] Figure 4 for Figure 3 Local structural diagram;

[0015] Figure 5 A second schematic diagram of a prototype connection structure for a battery pack bottom guard plate provided in this embodiment of the present invention;

[0016] Figure 6This is a three-dimensional structural diagram of the convex bulge provided in an embodiment of the present utility model;

[0017] Figure 7 This is a schematic diagram of a partial assembly state of a prototype connection structure for a battery pack bottom guard plate provided in an embodiment of this utility model.

[0018] In the picture:

[0019] 1. Bottom protective plate; 11. Notch; 2. Protrusion; 21. First connecting surface; 22. Second connecting surface; 23. Third connecting surface; 24. Cavity; 3. Liquid cooling plate; 4. Original bottom protective plate; 41. Protrusion. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the described embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0021] Unless otherwise defined, the technical or scientific terms used in this disclosure should have the ordinary meaning understood by one of ordinary skill in the art to which this disclosure pertains. It should be noted that terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," "front," and "rear," indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are used only for the convenience of describing the present invention and for 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 the present invention. Furthermore, terms such as "first," "second," "third," and "fourth," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0022] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" 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 of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0023] The following is a detailed description of a prototype connection structure for a battery pack bottom guard plate provided in an embodiment of this utility model, with reference to the accompanying drawings.

[0024] Example

[0025] Figure 1 This diagram illustrates a connection structure of the original bottom protective plate of a battery pack according to an embodiment of the present invention. Figure 2 This diagram shows a partial assembly state of the battery pack bottom guard plate connection structure provided in an embodiment of the present invention. Figure 3 This illustration shows one of the schematic diagrams of a prototype connection structure for a battery pack bottom guard plate provided in an embodiment of the present invention; Figure 4 It shows Figure 3 Local structural diagram; Figure 5 This is a second schematic diagram of a prototype connection structure for a battery pack bottom guard plate provided in an embodiment of the present invention; Figure 6 A three-dimensional structural diagram of the convex bulge provided in an embodiment of this utility model is shown; Figure 7 This diagram shows a partial assembly state of a prototype connection structure for a battery pack bottom guard plate provided in an embodiment of the present invention. Figure 1 and Figure 2 The traditional battery bottom protector installation method and structure are shown. The original bottom protector 4 has several protrusions 41 along its edge, a traditional structure formed by stamping with a bottom protector mold. This structure is advantageous when product models are stable and mass production is feasible, but the molds are expensive. If frequent new model designs or modifications to existing models are required, this advantage is lost because mold modifications are involved, and the cycle for making or modifying molds is long, extending the overall battery pack development cycle. Furthermore, the high mold development costs lead to higher overall project costs. This utility model embodiment provides a prototype connection structure for a battery pack bottom protector, as shown... Figures 3 to 7As shown, the system includes: a bottom protective plate 1 and protruding parts 2. Several protruding parts 2 are disposed on the edge of the bottom protective plate 1 and mechanically connected to the bottom protective plate 1 by welding. Several notches 11 are provided on the bottom protective plate 1, which are located at the four edges of the bottom protective plate 1. The notches 11 can be formed by laser cutting, which is a mature and fast cutting method. The position of the notches 11 can be adjusted as needed. The shape and number of the protruding parts 2 are adapted to the notches 11, and they are corresponding one-to-one. The protruding parts 2 are mechanically connected to the notches 11 by welding at the positions of the notches 11. The edges of the protruding parts 2 are connected to the edges of the notches 11 by welding. The welding method is one of spot welding and laser welding, preferably spot welding, which can be widely used in steel plates, aluminum plates, etc. Since the bottom protective plate 1 is an open structure, sealing is not required, and the area of ​​the protruding parts 2 is small and the stress is not large. Therefore, full welding is not required during welding, and the weld bead is short. This process can be completed quickly, and the total welding time is short. Compared with the traditional bottom protective plate solution, the increased labor cost and welding cost are lower. The convex part 2 in this embodiment can be mass-produced using molds and is universal. Because the convex part 2 is small in size, the mold cost is low. The steel plate is stamped by the bottom protection plate mold to form the bottom protection plate 1. The mold of the bottom protection plate 1 no longer has the original protrusion 41 structure. The stamped bottom protection plate 1 has a flat edge. After the bottom protection plate 1 is formed, the edge of the bottom protection plate 1 is cut off by laser cutting equipment to form several notches 11. Then, the convex part 2 is welded to the bottom protection plate 1 by welding equipment. This is especially suitable for the trial production of multiple models of the bottom protection plate 1, which greatly saves the mold manufacturing cost of the bottom protection plate 1, shortens the research and development cycle, and facilitates rapid innovation and verification of the battery pack structure.

[0026] In a prototype connection structure for a battery pack bottom cover provided in this embodiment, the protruding member 2 includes a first connecting surface 21, a second connecting surface 22, and a third connecting surface 23. The first connecting surface 21, the second connecting surface 22, and the third connecting surface 23 are respectively disposed on the side of the protruding member 2 and form a cavity 24. The protruding member 2 is mechanically connected to the bottom cover 1 by welding, with the edges of the first connecting surface 21, the second connecting surface 22, and the third connecting surface 23 corresponding to the edges of the notch 11. Preferably, the notch 11 is square in shape, and the protruding member 2 forms a cuboid or cube-shaped box structure with an opening on one side through the first connecting surface 21, the second connecting surface 22, and the third connecting surface 23. The hollow portion of the box forms the cavity 24. The height of the cavity 24 is greater than the height of the screw head to accommodate the screw head. Furthermore, the length and width of the cavity 24 also need to be greater than the maximum horizontal outline dimension of the screw head. The screw head is mounted on the liquid cooling plate 3, and the bottom protective plate 1 is mechanically connected to the liquid cooling plate 3. In this way, the protruding part 2 provides necessary protection for the screw head on the liquid cooling plate 3, reducing the intrusion of external mud, sand and gravel, reducing the occurrence of screw loosening or corrosion, and also preventing the screw head on the liquid cooling plate 3 from causing positional interference or other adverse effects on the subsequent assembly of the bottom protective plate 1.

[0027] Compared with the prior art, the present invention has a simple and reasonable structural design. Targeting the rapid design needs of new energy vehicle battery packs, it improves the structure and connection method of the bottom guard plate 1 and the protruding part 2 of the battery pack. Compared with the traditional bottom guard plate, the strength and function of the bottom guard plate 1 are not weakened. The mold cost, laser cutting cost, welding cost, etc. of the added protruding part 2 are far lower than the mold development cost of the traditional bottom guard plate. The solution of the present invention is more cost-effective, shortens the research and development cycle, and is more suitable for the trial production and development needs of bottom guard plates for battery packs of various specifications and models.

[0028] The following points need to be explained:

[0029] (1) Unless otherwise defined, the same reference numerals in the embodiments of this utility model and the accompanying drawings have the same meaning.

[0030] (2) The accompanying drawings of this utility model embodiment only involve the structure involved in this utility model embodiment. Other structures can refer to the general design.

[0031] (3) For clarity, some structures in the drawings used to describe embodiments of the present invention may be enlarged or reduced, that is, these drawings are not drawn to actual scale.

[0032] (4) Where there is no conflict, the embodiments of this utility model and the features in the embodiments can be combined with each other to obtain new embodiments.

[0033] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A prototype connection structure for a battery pack bottom protective plate, characterized in that, include: Bottom plate (1), protruding parts (2), a plurality of the protruding parts (2) are disposed on the edge of the bottom plate (1) and are mechanically connected to the bottom plate (1) by welding; the bottom plate (1) is provided with a plurality of notches (11), the protruding parts (2) are adapted to the shape and number of the notches (11), and the protruding parts (2) are mechanically connected to the notches (11) by welding at the notches (11).

2. The prototype connection structure for the battery pack bottom protective plate according to claim 1, characterized in that, The protruding part (2) includes a first connecting surface (21), a second connecting surface (22), and a third connecting surface (23). The first connecting surface (21), the second connecting surface (22), and the third connecting surface (23) are respectively disposed on the side of the protruding part (2) and form a cavity (24). The protruding part (2) is mechanically connected to the bottom guard plate (1) by welding at the corresponding notch (11) positions through the first connecting surface (21), the second connecting surface (22), and the third connecting surface (23).

3. The prototype connection structure for the battery pack bottom protective plate according to claim 2, characterized in that, The height of the cavity (24) is greater than the height of the screw head to accommodate the screw head.

4. The prototype connection structure for the battery pack bottom protective plate according to any one of claims 1-3, characterized in that, The welding method is either spot welding or laser welding.

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