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 first frame, a second frame, a first bottom plate and a second bottom plate; the first bottom plate is connected to the bottom of the first frame to form a first containing cavity, and the second bottom plate and the second frame are arranged in the first containing cavity. The second bottom plate is connected to the bottom of the second frame to form a second accommodating cavity, a battery cell module of the battery pack is arranged in the second accommodating cavity, and the second bottom plate supports the battery cell module; the second frame is fixedly connected to the first frame, and the second bottom plate and the first bottom plate are arranged at intervals. The double-layer frame structure of the box body makes full use of the surplus space in the battery pack, and meets the requirements of the battery pack for structural safety and thermal insulation performance.

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 increase the distance between each group of cells and use wide beams to separate the cell groups so that smaller cell groups can be distributed relatively evenly in large battery boxes. However, this method does not fully utilize the excess space of the battery to improve battery performance. The excess space is divided into multiple discontinuous places; and overly dispersed cell groups are not conducive to the integration of the battery pack. The compact arrangement of the cell groups affects the strength and also brings about the problem of rising costs.

[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, the box comprising a first frame, a second frame, a first bottom plate and a second bottom plate; the first bottom plate is connected to the bottom of the first frame to form a first accommodating cavity, and the second bottom plate and the second frame are arranged in the first accommodating cavity; the second bottom plate is connected to the bottom of the second frame to form a second accommodating cavity, the battery cell module of the battery pack is arranged in the second accommodating cavity, and the second bottom plate supports the battery cell module; the second frame is fixedly connected to the first frame, and the second bottom plate is spaced apart from the first bottom plate.

[0007] In an optional technology of the present invention, the bottom of the first frame extends into the first accommodating cavity to form a supporting portion, and the top of the second frame extends outward to form a hanging portion, which is connected to the top of the supporting portion through a fastener in a fixing hole of the frame.

[0008] In an optional technology of the present invention, a plurality of side edges of the first frame are provided with supporting parts and a plurality of side edges of the second frame are provided with hanging parts.

[0009] In an optional technology of the present invention, the second bottom plate has a flow channel for fluid to pass through.

[0010] In an optional technology of the present invention, the second frame includes a plurality of cross beams and a plurality of longitudinal beams, and the cross beams and the longitudinal beams divide the second accommodating cavity into a plurality of sub-accommodating cavities.

[0011] In the optional technology of the present invention, a plurality of mounting holes are provided on the cross beam and / or the longitudinal beam, and a module hanging ear is provided on the battery cell module; the module hanging ear is fixed on the mounting hole, so that the battery cell module is fixed in a plurality of sub-accommodating cavities.

[0012] In an optional technology of the present utility model, the box body further includes: an upper cover plate, which is connected to the top surface of the first frame 11.

[0013] In an optional technology of the present invention, the first frame includes a mounting beam.

[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, in which:

[0017] Figure 1 This is an overall schematic diagram of the utility model after the box body is installed with the battery cell;

[0018] Figure 2 It is a schematic diagram of the combination of the first frame 11 and the first bottom plate 13 of the box body of the utility model;

[0019] Figure 3 It is a schematic diagram of the combination of the second frame 12 and the second bottom plate 14 of the box body of the utility model;

[0020] Figure 4 It is an overall schematic diagram of the second frame 12 and the second bottom plate 14 of the box of the utility model after the battery cells are installed;

[0021] Figure 5 It is a cross-sectional view of the second frame 12 and the second bottom plate 14 of the box of the utility model after the battery cells are installed;

[0022] Figure 6 It is a cross-sectional view of the utility model after the box body is installed with the battery core. DETAILED DESCRIPTION

[0023] 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.

[0024] 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.

[0025] 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.

[0026] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 As shown, a box body 1 of a battery pack includes a first frame 11, a second frame 12, a first bottom plate 13 and a second bottom plate 14; the first bottom plate 13 is connected to the bottom of the first frame 11 to form a first accommodating cavity, and the second bottom plate 14 and the second frame 12 are arranged in the first accommodating cavity; the second bottom plate 14 is connected to the bottom of the second frame 12 to form a second accommodating cavity, and the second accommodating cavity is used to accommodate battery cells and these battery cells are supported by the second bottom plate 14; at the same time, the second frame 12 is fixedly connected to the first frame 11, specifically by connecting the outer periphery of the second frame 12 to the inner periphery of the second frame 12, and the second bottom plate 14 is spaced apart from the first bottom plate 13.

[0027] The outer periphery of the second frame 12 is connected to the inner periphery of the second frame 12 so that a gap is left between the second frame 12 and the first frame 11 , which serves as a collapse space for the first frame 11 to deform when the battery pack is hit.

[0028] In one embodiment of the present invention, Figure 6As shown, a support portion 111 is provided on the inner side of the bottom of the first frame 11, and a hanging portion 121 is provided on the outer side of the top of the second frame 12. The hanging portion 121 is connected to the upper side of the support portion 111 through a fastener 123 in a frame fixing hole 122; wherein the distance from the bottom surface of the hanging portion 121 to the bottom surface of the second bottom plate 14 is smaller than the distance from the top surface of the support portion 111 to the first bottom plate 13. In this way, the battery cell in the second accommodation cavity is suspended on the first frame 11 through the second frame 12.

[0029] Further, if Figure 2 and Figure 3 As shown, multiple sides of the first frame 11 each have a supporting portion 111 and multiple sides of the second frame 12 each have a hanging portion 121 to enable a more stable installation.

[0030] Through the above scheme, the battery cells in the battery pack structure are not in direct contact with the outermost box structure of the battery pack, namely the first frame 11 and the first bottom plate 13, thereby avoiding heat exchange inside and outside the battery pack to the greatest extent; the double-layer frame structure fully utilizes the surplus space in the battery pack and improves the collision safety performance of the battery pack.

[0031] The second bottom plate 14 has a flow channel for fluid to pass through, that is, the second bottom plate 14 integrates a heat exchange plate, and the battery cells carried by the second floor are cooled or heated by the fluid in the heat exchange flow channel. Due to the spacing between the second bottom plate 14 and the first bottom plate 13, the heat exchange plate will not be directly in contact with the external box, causing the internal fluid to be affected by the external environment.

[0032] like Figure 4 As shown, in one embodiment of the present utility model, the second frame 12 includes a plurality of cross beams and a plurality of longitudinal beams, and the cross beams and the longitudinal beams divide the second accommodating cavity into a plurality of sub-accommodating cavities, and the battery cells are arranged in the plurality of sub-accommodating cavities.

[0033] Due to the gap between the second frame 12 and the first frame 11, by increasing the size of the gap and then reducing the spacing between the battery cell groups, the size of the beams and longitudinal beams constituting the second frame 12 can be set to be equivalent to the size of the beams and longitudinal beams in the conventional battery pack box, which is conducive to the standardization of some parts and reduces costs. Similarly, by increasing the gap between the second frame 12 and the first frame 11, the size of the second accommodating space is reduced, and the area of ​​the second bottom plate 14 is reduced. When the heat exchange plate is integrated on the second bottom plate 14, the required area of ​​the heat exchange plate will also be reduced, which is conducive to reducing the difficulty and cost of manufacturing.

[0034] The second frame 12 may be formed by connecting multiple sections of profiles as cross beams and longitudinal beams, or may be integrally formed by a process such as die casting.

[0035] A plurality of module mounting holes 124 are provided on the cross beam and / or the longitudinal beam, and the battery cells in the second accommodating cavity are combined to form a plurality of modules 2, and each module 2 is respectively arranged in each sub-accommodating cavity. A module hanging ear 22 is provided on the module 2, and a connecting hole is provided on the module hanging ear 22. The module 2 is fixed to the second frame 12 by a connecting piece passing through the connecting hole of the module hanging ear 22 and the module mounting hole 124.

[0036] The box body 1 further includes an upper cover plate 15 , which is connected to the top surface of the first frame 11 to close the first accommodating cavity and isolate the battery cell from the space outside the box body.

[0037] like Figure 2 and Figure 6 As shown, the first frame 11 includes mounting beams 112; the mounting beams 112 are located on both sides of the first frame and are used to fix and connect electrical equipment, such as an electric car.

[0038] In the above-mentioned multiple embodiments, the box structure in the utility model reduces the damage to the battery cells during collision to avoid safety accidents, and at the same time reduces the heat transfer between the battery cells and the external environment; it takes into account the structural safety and thermal insulation performance requirements of the battery pack, and at the same time, some structures can continue the specifications required for small-capacity battery packs, thereby reducing some costs.

[0039] In addition, the utility model also provides a battery pack, comprising a box body of any one of the above technical solutions.

[0040] Furthermore, the utility model also provides an electrical device, such as an electric car, comprising the aforementioned battery pack.

[0041] So far, the technical solution of the utility model has been described in conjunction with the preferred embodiments shown in the accompanying drawings, but it is easy for those skilled in the art to understand that the protection scope of the utility model is obviously not limited to these specific embodiments. Without departing from the principle of the utility model, 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 utility model.

Claims

1. A battery pack box, characterized in that: It comprises a first frame (11), a second frame (12), a first bottom plate (13) and a second bottom plate (14); The first bottom plate (13) is connected to the bottom of the first frame (11) to form a first accommodating cavity, and the second bottom plate (14) and the second frame (12) are arranged in the first accommodating cavity; The second bottom plate (14) is connected to the bottom of the second frame (12) to form a second accommodating cavity, the battery cell module (2) of the battery pack is arranged in the second accommodating cavity, and the second bottom plate (14) supports the battery cell module (2); The second frame (12) is fixedly connected to the first frame (11), and the second bottom plate (14) is spaced apart from the first bottom plate (13).

2. The box according to claim 1, characterized in that: A supporting portion (111) is provided on the inner side of the first frame (11), and a hanging portion (121) is provided on the outer side of the second frame (12); the hanging portion (121) is connected to the upper side of the supporting portion (111) via a fastener (123) in a frame fixing hole (122).

3. The box according to claim 2, characterized in that: The supporting parts (111) are provided on a plurality of side edges of the first frame (11), and the hanging parts (121) are provided on a plurality of side edges of the second frame (12).

4. The box according to claim 1, characterized in that: The second bottom plate (14) has a flow channel for fluid to pass through.

5. The box according to claim 1, characterized in that: The second frame (12) comprises a plurality of transverse beams and a plurality of longitudinal beams, and the transverse beams and the longitudinal beams divide the second accommodating cavity into a plurality of sub-accommodating cavities.

6. The box according to claim 5, characterized in that: The cross beam and / or the longitudinal beam are provided with a plurality of mounting holes (124), and the battery cell module (2) is provided with a module mounting lug; The module hanging ear (22) is fixed on the mounting hole (124), so that the battery core module (2) is fixed in the plurality of sub-accommodating cavities.

7. The box according to claim 1, characterized in that: The box body further comprises: an upper cover plate (15), wherein the upper cover plate (15) is connected to the top surface of the first frame (11).

8. The box according to claim 1, characterized in that: The first frame (11) comprises a mounting beam (112).

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

10. An electrical device, characterized in that: A battery pack comprising the battery pack of claim 9.

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