Box body of battery pack, battery pack and electric equipment

Abstract

The utility model relates to the technical field of power batteries, and particularly provides a box body of a battery pack, the battery pack and electric equipment. The box body of the battery pack comprises a frame, a first cover plate and a second cover plate; the frame comprises a first frame, a second frame and reinforcing ribs, the first frame surrounds to form an accommodating space for a battery pack cell, and the second frame is arranged on the outer side of the first frame at intervals and is connected with the first frame through the reinforcing ribs; and the first cover plate and the second cover plate are respectively connected with the top surface and the bottom surface of the first frame. According to the utility model, the actual use space of the battery of the battery pack is reduced, so that the external collision crumple space of the battery pack is increased, the safety of the battery pack under the collision condition of special working conditions and the structural rigidity of the whole battery pack are improved, and meanwhile, the die sizes of die parts such as an upper cover and a bottom plate of the battery pack can be reduced, so that the die cost is saved.

Description

Technical Field

[0001] The utility model relates to the technical field of power batteries, and specifically provides a battery pack box, a battery pack and electrical equipment. Background Art

[0002] With the development of new energy vehicles, the performance of power battery packs as core functional components has received more and more attention. In the existing technology, new energy vehicles with different mileages are usually matched with battery packs of different capacities. In order to ensure the consistency of the overall vehicle structure and the universality of parts adaptation and the requirements for upgrading the vehicle's mileage in the future, large-capacity battery packs and small-capacity battery packs will use the same size.

[0003] For battery packs of the same size, small-capacity battery packs usually have fewer cells, and the cells in the battery pack occupy a smaller volume, so there will be excess space in the battery pack and unreasonable distribution of cells. The solution for some existing battery packs is to directly replace several modules in the small-capacity battery pack with filling blocks of similar appearance to ensure that the space in the battery pack is completely filled. This solution is widely adopted due to its simple design and low cost. However, since the quality and structural strength of the filling blocks are somewhat different from those of the actual battery modules, it will affect the structural stability of the battery pack and may affect the quality balance of the entire vehicle.

[0004] In summary, a box structure for a small battery pack of the same size that can solve the above problems needs to be proposed. Utility Model Content

[0005] The utility model aims to solve the above technical problem, namely, the problem that the space of a small-capacity battery pack of the same size as a conventional-capacity battery pack cannot be reasonably configured.

[0006] To this end, in a first aspect, the utility model provides a battery pack box including a frame, a first cover plate, and a second cover plate; the frame includes a first frame, a second frame, and reinforcing ribs, the first frame surrounds and forms a storage space for battery cells in the battery pack, the second frame is arranged at an interval on the outside of the protected first frame and is connected to the first frame through reinforcing ribs; the first cover plate is connected to the top surface of the first frame, and the second cover plate is connected to the bottom surface of the first frame.

[0007] The utility model increases the external collision collapse space of the battery pack by reducing the actual use space of the battery pack, thereby improving the safety of the battery pack under special working collision conditions and the structural rigidity of the entire battery pack, and at the same time can also reduce the mold size of mold parts such as the battery pack cover and bottom plate, thereby saving mold costs.

[0008] In the optional technology of the present invention, the frame also includes: a third frame, the third frame is connected to the first frame, and together with the first frame, forms a storage space for the battery pack electrical components, and the second cover is connected to the bottom surface of the third frame.

[0009] In an optional technology of the present invention, the third frame is arranged on one side of the first frame in the first direction; the second frame is arranged on the other side in the first direction and on both sides in the second direction, and the first direction is orthogonal to the second direction.

[0010] In an optional technology of the present invention, a width W1 of the first frame on both sides in the second direction and a width W2 of the second frame on both sides in the second direction satisfy 70% W2≤W1≤86% W2.

[0011] In an optional technology of the present utility model, the third frame is arranged on one side of the first frame in the first direction, and the second frame is arranged on both sides in the second direction, and the first direction is orthogonal to the second direction.

[0012] In an optional technology of the present invention, a width W1 of the first frame on both sides in the second direction and a width W2 of the second frame on both sides in the second direction satisfy 60% W2≤W1≤80% W2.

[0013] In an optional technology of the present invention, the frame includes a mounting beam, and the mounting beam is arranged on the second frame.

[0014] In a second aspect, the utility model further provides a battery pack, comprising a box body of any one of the above technical solutions.

[0015] In a third aspect, the utility model further provides an electrical device, comprising the above-mentioned battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings.

[0017] In the figure:

[0018] Figure 1 This is the solution adopted by the prior art of the utility model;

[0019] Figure 2 It is a top view of the box body of the utility model;

[0020] Figure 3 This is a perspective view of the box of the utility model;

[0021] Figure 4 It is a three-dimensional diagram of another viewing angle of the box body of the utility model;

[0022] Figure 5 It is a three-dimensional diagram of an embodiment of the box body of the utility model;

[0023] Figure 6 It is a three-dimensional diagram of another embodiment of the box body of the present utility model. DETAILED DESCRIPTION

[0024] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not used to limit the protection scope of the present invention. Those skilled in the art can make adjustments to them as needed to adapt to specific application scenarios.

[0025] It should be noted that in the description of the present invention, the terms "inside", "outside" and other terms indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings, which are only for the convenience of description, and do not indicate or imply that the relevant devices or elements must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, ordinal numbers such as "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0026] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installation" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] like Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 As shown, a box body of a battery pack includes a frame 1, a first cover plate 2, and a second cover plate 3; the frame 1 includes two layers: a first frame 11 and a second frame 12, the first frame 11 surrounds a closed shape to form a battery compartment as a storage space for battery cells, and the second frame 12 is arranged at intervals on the outside of the protected first frame 11, and is connected to the first frame 11 through a reinforcing rib 13; the peripheries of the first cover plate 2 and the second cover plate 3 are respectively connected to the top and bottom surfaces of the first frame 11 to close the battery compartment and separate the battery cells from the external environment.

[0028] Compared with Figure 1In the solution of the prior art shown, in the box body of the present utility model, the first frame 11 on the inner side forms the space for actually accommodating the battery cells, which serves as the actual functional part of the battery pack. The second frame 12 is located on the outer side and forms the outer contour of the battery pack. The two are connected by the reinforcing ribs 13. When the electrical device using the battery pack is subjected to an external impact and the second frame 12 deforms, the interval from the second frame 12 to the first frame 11 is such that there is sufficient collapse space to prevent the battery cells from being affected. Due to the existence of multiple reinforcing ribs 13 between the first frame 11 and the second frame 12, when the second frame 12 deforms, the reinforcing ribs 13 have a resistance effect on the deformation, which can reduce the amount of deformation and avoid damaging the battery cells.

[0029] Since the first cover plate 2 and the second cover plate 3 are only connected to the first frame 11, that is, the first cover plate 2 and the second cover plate 3 are designed according to the size of the actual battery pack capacity, the materials required for manufacturing the first cover plate 2 and the second cover plate 3 can be reduced, and the cost can be lowered. In addition, since the first cover plate 2 and the second cover plate 3 are not connected to the second frame 12, when the second frame 12 deforms, the first cover plate 2 and the second cover plate 3 are not easily affected and deformed. That is to say, even if the battery pack is externally impacted, the first cover plate 2 and the second cover plate 3 can better maintain the closure of the battery compartment.

[0030] Similar to the conventional battery pack, structural beams can still be added in the accommodation cavity of the battery cells in the box body of the present utility model to strengthen the strength of the box body. The structural beams can be one or more, and the extending direction can be horizontally transverse or longitudinal or both; similarly, mounting components are provided on the structural beams as the middle mounting points, and adding fixing points for the battery cells on the structural beams and other solutions all belong to the scope of the prior art and will not be elaborated in the present utility model.

[0031] As Figure 2 、 Figure 3 and Figure 4 shown, in an embodiment of the present utility model, the box body further includes a third frame 14. The third frame 14 can be in a "C" shape. The two ends of the "C" - shaped third frame 14 are connected to the first frame 11, and together with the first frame 11, they enclose a accommodation space to serve as an electrical compartment for accommodating the electrical components of the battery pack. In this way, the electrical compartment and the battery compartment can share the same second cover plate 3. The second cover plate 3 is connected to the bottom surface of the third frame 14 to close the bottom of the electrical compartment.

[0032] Of course, the specific shape of the third frame 14 can be more than just a "C" shape, semi - circular arc, rectangle, semi - circle. As long as it is a circumferentially closed or semi - closed structure and can be connected to the first frame 11 to form a certain accommodation space, the purpose of sharing the same cover plate can be achieved. Through such a setting, the electrical compartment and the battery compartment are directly adjacent, and the area of the second cover plate 3 does not need to include the transition part between the two, further reducing its area.

[0033] For the convenience of battery pack maintenance, on the other side of the second cover plate 3, a separate electrical compartment cover 4 is adopted for the electrical compartment, which does not share the first cover plate 2.

[0034] It should be additionally noted that in the above embodiments, it is possible to share either the second cover plate 3 or the first cover plate 2 between the electrical compartment and the battery compartment. The separate electrical compartment cover 4 is not limited to being provided only on the top of the electrical compartment, that is, the electrical compartment cover 4 is not limited to connecting to the top surface of the third frame 14. Generally, both the electrical connection structure and the pipeline connection structure in the electrical compartment are on the top, and an opening needs to be made in the top cover plate to accommodate these connection structures. Setting the opening in the electrical compartment cover 4 with a relatively small overall area is beneficial for processing; however, the above conventional setting does not exclude the scheme of sharing the first cover plate 2 between the electrical compartment and the battery compartment, that is, the first cover plate 2 is connected to the top surface of the third frame 14. In cases where needed, those skilled in the art can fully adopt the following scheme:

[0035] The electrical compartment can share the same first cover plate 2 with the battery compartment. The first cover plate 2 is connected to the top surface of the third frame 14, and a separate electrical compartment cover 4 is adopted for the electrical compartment.

[0036] As Figure 3 shown, the second frame 12 includes a mounting beam 15, and the mounting beam 15 is used to connect the battery pack to the electrical equipment; specifically, the mounting beam 15 extends outward relatively from opposite sides in the second direction of the second frame 12, and a plurality of mounting components are provided on the mounting beam 15. The battery pack is fixed to the electrical equipment such as an electric vehicle through the bolts on the mounting components.

[0037] As Figure 5 For Figure 6 shown, for battery packs of the same size, the second frame 12 forming the outer contour has the same dimensions in the first and second directions. How to more reasonably arrange the space is essentially how the first frame 11 and the second frame 12 are combined and designed to form an interval space. In this regard, the present utility model has different frame design schemes:

[0038] As an embodiment, Figure 5 in it, the third frame 14 forming the periphery of the electrical compartment is provided on one side in the first direction of the first frame 11; therefore, the second frame 12 is provided on the other side in the first direction and on both sides in the second direction orthogonal to the first direction. Overall, the structure of the second frame 12 is continuous and presents an "L" shape. The second frame 12 as a whole is in a semi - surrounding shape with respect to the first frame 11, and the reinforcing rib 13 connects the first frame 11 and the second frame 12 to form a stable structure. The "L" - shaped second frame 12, in cooperation with the connecting reinforcing rib 13, realizes the protection of the battery in multiple directions to cope with various collision risks.

[0039] Specifically, in this embodiment, the width W1 of the first frame 11 on both sides in the second direction and the width W2 of the second frame 12 on both sides in the second direction satisfy 70% W2≤W1≤86% W2. When the distance between the first frame 11 and the second frame 12 is equal, the distance between the first frame 11 and the second frame 12 on one side accounts for 7-15% of the width of the entire battery pack. For a battery pack of conventional size, the distance between the first frame 11 and the second frame 12 is 25mm-40mm.

[0040] As another example, Figure 6 In the embodiment, the second frame 12 is arranged on both sides in the second direction, and the second frame 12 is not connected to the first frame 11 in the first direction. The second frame 12 presents a two-section strip structure as a whole, and the reinforcing rib 13 vertically connects the first frame 11 and the second frame 12 to form a stable structure.

[0041] Specifically, in this embodiment, the width W1 of the first frame 11 on both sides in the second direction and the width W2 of the second frame 12 on both sides in the second direction satisfy 60% W2≤W1≤80% W2. When the distance between the two sides is equal, the distance between the first frame 11 and the second frame 12 on one side accounts for 10-20% of the width of the entire battery pack. For a battery pack of conventional size, the spacing width is 35mm-50mm. In this embodiment, when the outer contour dimensions of the battery pack are consistent, more spacing spaces are set on both sides of the battery compartment to cope with side collisions.

[0042] By adopting the box bodies of the above two embodiments, when the rated capacity of the battery pack is 1 / 3 to 2 / 3 smaller than the rated capacity of a conventional battery pack but the external dimensions are the same, such a box body design can realize the rational utilization of more surplus space in the battery pack, thereby enhancing the structural strength of the battery pack while reducing the cost.

[0043] In each embodiment of the present invention, the frame 1 can be formed by integral casting, that is, the integral molding method facilitates processing and manufacturing and reduces costs.

[0044] As an example, Figure 5 , Figure 6 As shown, in the third direction, the first frame 11, the second frame 12, the third frame 14 and the reinforcing ribs 13 have the same height to ensure the flatness and consistency of the upper and lower surfaces and to reduce the cost of the casting mold.

[0045] In addition, if the box body further includes an internal structural beam, the structural beam can also be cast integrally with the frame 1; for the same purpose, the structural beam also has the same height in the third direction.

[0046] In addition, the utility model also provides a battery pack, comprising a box body of any one of the above technical solutions.

[0047] Furthermore, the utility model also provides an electrical device, including the above-mentioned battery pack.

[0048] So far, the technical solution of the present invention has been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. A battery pack box, characterized in that: It comprises a frame (1), a first cover plate (2), and a second cover plate (3); The frame (1) comprises a first frame (11), a second frame (12), and a reinforcing rib (13); the first frame (11) surrounds a storage space for battery cells; the second frame (12) is arranged on the outside of the first frame (11); and the reinforcing rib (13) is arranged between the first frame (11) and the second frame (12); The first cover plate (2) is connected to the top surface of the first frame, and the second cover plate (3) is connected to the bottom surface of the first frame.

2. The box according to claim 1, characterized in that: The frame (1) further comprises: a third frame (14), the third frame (14) being connected to the first frame (11) and surrounding the first frame (11) to form a storage space for electrical components, and the second cover plate (3) being connected to the bottom surface of the third frame (14).

3. The box according to claim 2, characterized in that: The third frame (14) is arranged on one side of the first frame (11) in a first direction; the second frame (12) is arranged on the other side in the first direction and on both sides in a second direction, and the first direction is orthogonal to the second direction.

4. The box according to claim 3, characterized in that: The width W1 of the first frame (11) on both sides in the second direction, and the width W2 of the second frame (12) on both sides in the second direction, satisfy 70%W2≤W1≤86%W2.

5. The box according to claim 2, characterized in that: The third frame (14) is arranged on one side of the first frame (11) in a first direction, and the second frame (12) is arranged on both sides in a second direction, and the first direction is orthogonal to the second direction.

6. The box according to claim 5, characterized in that: The width W1 of the first frame (11) on both sides in the second direction and the width W2 of the second frame (12) on both sides in the second direction satisfy 60%W2≤W1≤80%W2.

7. The box according to claim 1, characterized in that: The frame comprises a mounting beam (15), and the mounting beam (15) is arranged on the second frame.

8. The box according to claim 1, characterized in that: The frame (1) is formed by integral casting.

9. A battery pack, characterized in that: The battery pack comprises a casing as claimed in any one of claims 1 to 8.

10. An electrical device, characterized in that: Comprising the battery pack as claimed in claim 9.

Images