Box frame and battery pack

Abstract

The utility model belongs to the technical field of batteries, and discloses a box frame and a battery pack. The box frame comprises an edge beam, a first buffer structure and a second buffer structure, the edge beam is internally provided with a containing space used for being filled with the first buffer structure, the second buffer structure is arranged on the side wall, facing the external environment, of the edge beam in a protruding mode and comprises a buffer strip and a supporting rib, and the buffer strip is of an annular structure and used for wrapping the supporting rib. And the buffer strip is supported and shaped through the supporting ribs. Through the arrangement, when the battery pack is subjected to side impact, the buffer strip can effectively absorb part of energy and dissipate part of energy, so that the force actually applied to the boundary beam and the energy which can be transmitted to the interior of the boundary beam main body are reduced, and the energy transmitted to the interior of the boundary beam main body is further absorbed and dispersed by the first buffer structure; therefore, the influence on the battery module can be greatly reduced, and the structural strength of the boundary beam and the internal safety of the battery pack are further improved.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a housing frame and battery pack. Background Technology

[0002] Cars are prone to side collisions at intersections and other locations. Because cars are equipped with high-energy-density battery packs, the internal batteries can easily be squeezed after a collision. The batteries can deform under the force, which can lead to thermal runaway and fire.

[0003] Existing battery pack solutions for side impact protection mostly involve increasing the safety distance between the battery pack and the side beams of the battery pack housing, which sacrifices the space utilization of the battery pack and reduces the energy density of the battery pack; or adding elastic mechanisms inside the battery pack, but this method requires a lot of space and also reduces the overall space utilization of the pack.

[0004] Therefore, it is necessary to design a housing frame and battery pack to solve the problems existing in the current battery pack solutions. Utility Model Content

[0005] The purpose of this invention is to provide a housing frame and battery pack that can ensure the structural strength of the battery pack in the event of a side collision, and also ensure that the energy density of the battery pack is not significantly affected, thereby enhancing the safety and practicality of the battery pack.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] The box frame includes a side beam, a first buffer structure, and a second buffer structure. The side beam has an internal space for filling the first buffer structure. The second buffer structure protrudes from the side wall of the side beam facing the external environment. The second buffer structure includes a buffer strip and a support rib. The buffer strip is a ring-shaped structure and is used to wrap the support rib so as to support and shape the buffer strip through the support rib.

[0008] Preferably, the buffer strip is triangular or semi-circular, and the side of the buffer strip away from the side beam is defined to form an anti-collision surface;

[0009] Alternatively, the buffer strip is quadrilateral, and the side of the buffer strip away from the side beam defines a collision protection surface.

[0010] Preferably, the buffer strip is triangular or semi-circular; the supporting rib is horizontally arranged, with one end of the supporting rib abutting against the buffer strip near the side beam, and the other end of the supporting rib supporting the anti-collision surface.

[0011] Preferably, the buffer strip is quadrilateral; the supporting ribs include horizontal reinforcing ribs and vertical reinforcing ribs, one end of the horizontal reinforcing rib abuts against the side of the buffer strip near the side beam, the other end of the horizontal reinforcing rib supports the anti-collision surface, the vertical reinforcing ribs are cross-connected with the horizontal reinforcing ribs, and the two ends of the vertical reinforcing ribs are respectively supported at the two ends of the buffer strip.

[0012] Preferably, the buffer strip is triangular and the anti-collision surface is arc-shaped;

[0013] Alternatively, the buffer strip is quadrilateral, and the corners at both ends of the anti-collision surface are rounded.

[0014] Preferably, the buffer strip and the supporting rib are integrally formed;

[0015] And / or, the buffer strip and the supporting rib are silicone rubber strips; and, the first buffer structure is a silicone rubber block or a moisture-curing foam adhesive.

[0016] Preferably, the side beam includes a side beam body and a mounting beam. The side beam body has the accommodating space, the mounting beam is disposed on the outside of the side beam body, and the second buffer structure is disposed on the outside of the mounting beam. The mounting beam is configured to have mounting points for mounting the battery pack.

[0017] Preferably, an adhesive layer is sandwiched between the buffer strip and the side beam to bond the buffer strip to the side beam.

[0018] Preferably, the accommodating space is provided with a plurality of partitions spaced at intervals along the vertical direction to divide the accommodating space into a plurality of independent partitions distributed along the vertical direction, and each independent partition is filled with the first buffer structure; and the filling volume of the first buffer structure in each independent partition is 1 / 3 to 2 / 3 of the volume of each independent partition.

[0019] The battery pack includes a battery module and the aforementioned housing frame, wherein the battery module is disposed within the housing frame.

[0020] The beneficial effects of this utility model are as follows: By setting a first buffer structure inside the side beam in the box frame and a second buffer structure outside the side beam, when the battery pack is subjected to a side impact, the buffer strip can effectively absorb and dissipate some of the energy, reducing the actual force applied to the side beam and the energy that can be transferred to the side beam body. The energy transferred to the side beam body will be further absorbed and dispersed by the first buffer structure, thereby greatly reducing the impact on the battery module, and thus improving the structural strength of the box frame and the safety of the battery pack. Attached Figure Description

[0021] Figure 1 This is an exploded view of the battery pack provided in this embodiment of the utility model;

[0022] Figure 2 This is a structural cross-sectional view of the side beam provided in an embodiment of this utility model.

[0023] In the picture:

[0024] 100. Battery module; 200. BDU;

[0025] 1. Top cover;

[0026] 2. Lower box body; 21. Side beam; 211. Side beam main body; 2111. Partition plate; 2112. Independent partition; 212. Hanging beam; 22. First buffer structure; 23. Second buffer structure; 231. Buffer strip; 232. Supporting rib. Detailed Implementation

[0027] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0028] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between 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.

[0029] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0030] In the description of this embodiment, the terms "upper," "lower," "right," and "left," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, 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. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0031] Example 1

[0032] See Figures 1 to 2 As shown, this embodiment provides a housing frame for a battery pack. The housing frame includes an upper cover 1 and a lower housing 2, wherein the lower housing 2 is used to house the battery module 100. The upper cover 1 is sealed over the top opening of the lower housing 2 to encapsulate the battery module 100 within the lower housing 2, thereby ensuring the safe use of the battery module 100. In this embodiment, the lower housing 2 includes a bottom plate, side beams 21, a first buffer structure 22, and a second buffer structure 23. It can be understood that the bottom plate and the side beams 21 together form a cavity for housing the battery module 100.

[0033] Among them, reference Figure 2 As shown, the side beam 21 includes a side beam body 211 and a mounting beam 212. In this embodiment, the side beam body 211 has a quadrilateral structure, and a mounting beam 212 is provided on the outer side of one set of opposite sides of the side beam body 211. The mounting beam 212 is provided with mounting points, which are used to mount the battery pack to the electrical equipment by means of mounting structures such as bolts. Preferably, in this embodiment, the side beam body 211 and the mounting beam 212 are integrally formed by an extrusion process. In addition, the interior of the side beam body 211 has a receiving space for filling the first buffer structure 22. The first buffer structure 22 is used to absorb the impact energy when the battery pack is subjected to a side impact, thereby playing a role in protecting the internal battery module 100 to a certain extent.

[0034] More specifically, multiple partitions 2111 are arranged vertically at intervals within the accommodating space of the side beam body 211 to divide the accommodating space into multiple independent partitions 2112 distributed vertically. In one embodiment, three partitions 2111 are arranged at intervals within the accommodating space to cut the accommodating space into four independent partitions 2112, and each independent partition 2112 is filled with the aforementioned first buffer structure 22, so that the first buffer structure 22 can be distributed along the height direction of the side beam body 211, which is beneficial for better absorbing the impact force generated by collision.

[0035] It should be noted that the number of first buffer structures 22 in each independent compartment 2112 is adjusted according to the specific design, and it is also necessary to determine whether the first buffer structure 22 needs to be filled in each independent compartment 2112 according to the actual structure, for example, it is necessary to avoid the upper and lower rivet nuts and the exhaust channels inside the whole package.

[0036] Of course, this invention does not limit the material used for the first buffer structure 22, as long as it has a buffering effect. For example, in this embodiment, the first buffer structure 22 is a silicone rubber block, which can be filled by cutting silicone rubber blocks that match the size of the independent partition 2112.

[0037] It is understood that in other parallel embodiments, the first buffer structure 22 can also be a moisture-curing expanding foam, which can be directly sprayed into the independent partition 2112 until it is completely filled. The components of the expanding foam can be single-component polyurethane adhesive, single-component polyethylene adhesive, etc., and this invention is not limited to this. The above-mentioned filling method of the first buffer structure 22 is simple, portable, and highly operable, and can effectively reduce the production cost of the box frame.

[0038] Furthermore, in this embodiment, the first buffer structure 22 within the independent partition 2112 has a filling volume of 1 / 3 to 2 / 3 of the volume of the independent partition 2112. This not only avoids the box frame being too heavy and affecting its use, but also meets the required buffering effect and optimizes the design cost.

[0039] In this embodiment, the second buffer structure 23 protrudes from the outer side of the mounting beam 212 and includes a buffer strip 231 and a support rib 232. The buffer strip 231 is a ring-shaped structure used to wrap around the support rib 232, thus supporting and shaping the buffer strip 231. In this configuration, the support rib 232 further enhances the structural strength of the side beam 21, improving its resistance to deformation. Furthermore, the support rib 232 provides necessary support for the buffer strip 231. Since the buffer strip 231 is a buffer material with a certain degree of elasticity and hardness, when the battery pack is subjected to a side impact, the buffer strip 231 can effectively absorb and dissipate some energy, reducing the force actually applied to the side beam 21 and the energy that can be transferred to the side beam body 211. The energy transferred to the side beam body 211 is further absorbed and dispersed by the first buffer structure 22, thereby greatly reducing the impact on the battery module 100 and improving the structural strength of the side beam 21 and the safety of the battery pack.

[0040] In one embodiment of this invention, the buffer strip 231 is triangular or semi-circular (only the structural schematic diagram when the buffer strip 231 is triangular is shown in the figure), and the side of the buffer strip 231 away from the side beam 21 is defined to form an anti-collision surface. The triangular or semi-circular buffer strip 231 can effectively disperse the pressure during a side impact and reduce the impact of concentrated impact, thereby giving the buffer strip 231 a better cushioning effect.

[0041] Furthermore, in this embodiment, when the buffer strip 231 is triangular, the anti-collision surface is arc-shaped to eliminate the sharp parts on the second buffer structure 23. On the one hand, this will be more conducive to the even distribution of the side impact force on the buffer strip 231, and on the other hand, it can prevent the handling personnel from being cut during handling, thereby ensuring the safety of the handling personnel.

[0042] Furthermore, the buffer strip 231 is a silicone rubber strip to give the buffer strip 231 the required hardness and elasticity.

[0043] Furthermore, the buffer strip 231 and the support rib 232 are integrally formed and made of the same material. This improves the structural strength of the buffer strip 231 and the support rib 232, thereby ensuring that the support rib 232 provides the necessary support for the buffer strip 231.

[0044] Optionally, in this embodiment, an adhesive layer is sandwiched between the buffer strip 231 and the mounting beam 212, so that the buffer strip 231 is bonded to the outside of the mounting beam 212, thereby facilitating the installation of the second buffer structure 23 and effectively controlling the overall weight of the box frame. Preferably, in this embodiment, the adhesive layer is a cured adhesive, and the material of the adhesive is not limited in this utility model.

[0045] Continue to refer to Figure 2 As shown, in this embodiment, the support rib 232 is horizontally arranged, and one end of the support rib 232 abuts against the side of the buffer strip 231 near the side beam body 211, and the other end of the support rib 232 is supported on the anti-collision surface, so as to ensure that the anti-collision surface of the buffer strip 231 has a certain structural strength, improve the compressive and impact resistance of the anti-collision surface, and improve the service durability.

[0046] This embodiment also provides a battery pack, including a battery module 100 and the aforementioned housing frame. The battery module 100 is disposed within the housing frame. Since a first buffer structure 22 is provided inside the side beam 21 of the housing frame, and a second buffer structure 23 is provided on the outside of the side beam 21, the battery pack can effectively absorb and disperse the lateral impact force when subjected to a lateral impact, thereby significantly reducing the impact on the battery module 100 and improving the safety, reliability, and durability of the battery pack.

[0047] Optionally, refer to Figure 1 As shown, the battery pack provided in this embodiment also includes a BDU200 (battery pack circuit breaker unit). The BDU200 is installed in the high-voltage area of ​​the lower housing 2. When the battery module 100 malfunctions (such as short circuit, overcharge or over-discharge), the BDU200 can disconnect the electrical connection of the battery pack, thereby further ensuring the safety of the battery pack.

[0048] Example 2

[0049] This embodiment provides a box frame, and the structure of the box frame provided in this embodiment is basically the same as that of the box frame provided in Embodiment 1. The only difference is that the buffer strip 231 is quadrilateral, and the side of the buffer strip 231 away from the side beam body 211 defines an anti-collision surface. Unlike the technical effect brought by the triangular or semi-circular buffer strip 231, the quadrilateral buffer strip 231 has better resistance to deformation. By using a material with higher hardness, the ability of the buffer strip 231 to resist the side impact force is improved, thereby avoiding excessive deformation of the buffer strip 231 during the collision, which would lead to a decrease in the protective effect.

[0050] It is understandable that when the buffer strip 231 is quadrilateral, the corners at both ends of the impact protection surface are rounded, which can also achieve the purpose of more evenly distributing the side impact force onto the buffer strip 231 and protecting the handling personnel.

[0051] Specifically, in this embodiment, the support rib 232 includes horizontal and vertical reinforcing ribs. One end of the horizontal reinforcing rib abuts against the buffer strip 231 near the side beam body 211, while the other end of the horizontal reinforcing rib supports the anti-collision surface to support and shape the buffer strip 231 in the horizontal direction, ensuring that the buffer strip 231 has a certain structural strength and stability in the horizontal direction. The vertical reinforcing rib is connected to the horizontal reinforcing rib in a cross shape, and both ends of the vertical reinforcing rib are respectively supported at both ends of the buffer strip 231 to support both ends of the buffer strip 231. This ensures the stability and strength of the buffer strip 231 in the vertical direction, so that the buffer strip 231 has sufficient support force in practical applications to cope with external impact forces.

[0052] In the description of this specification, references to terms such as "some embodiments," "other embodiments," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0053] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A box frame, characterized in that, The device includes a side beam (21), a first buffer structure (22), and a second buffer structure (23). The side beam (21) has an internal space for filling the first buffer structure (22). The second buffer structure (23) is protruding from the side wall of the side beam (21) facing the external environment. The second buffer structure (23) includes a buffer strip (231) and a support rib (232). The buffer strip (231) is a ring structure and is used to wrap the support rib (232) so that the buffer strip (231) is supported and shaped by the support rib (232).

2. The box frame according to claim 1, characterized in that, The buffer strip (231) is triangular or semi-circular, and the side of the buffer strip (231) away from the side beam (21) is defined to form an anti-collision surface; Alternatively, the buffer strip (231) is quadrilateral, and the side of the buffer strip (231) away from the side beam (21) defines a collision protection surface.

3. The box frame according to claim 2, characterized in that, The buffer strip (231) is triangular or semi-circular; the support rib (232) is horizontally arranged, one end of the support rib (232) abuts against the side of the buffer strip (231) near the side beam (21), and the other end of the support rib (232) is supported by the anti-collision surface.

4. The box frame according to claim 2, characterized in that, The buffer strip (231) is quadrilateral; the supporting rib (232) includes a horizontal reinforcing rib and a vertical reinforcing rib. One end of the horizontal reinforcing rib abuts against the side of the buffer strip (231) near the side beam (21), and the other end of the horizontal reinforcing rib supports the anti-collision surface. The vertical reinforcing rib is cross-connected with the horizontal reinforcing rib, and the two ends of the vertical reinforcing rib are respectively supported at the two ends of the buffer strip (231).

5. The box frame according to claim 2, characterized in that, The buffer strip (231) is triangular, and the anti-collision surface is arc-shaped; Alternatively, the buffer strip (231) is quadrilateral, and the corners at both ends of the anti-collision surface are rounded.

6. The box frame according to claim 1, characterized in that, The buffer strip (231) and the supporting rib (232) are integrally formed; and / or, The buffer strip (231) and the support rib (232) are silicone rubber strips; and the first buffer structure (22) is a silicone rubber block or a moisture-curing foam adhesive.

7. The box frame according to claim 1, characterized in that, The side beam (21) includes a side beam body (211) and a mounting beam (212). The side beam body (211) has the accommodating space inside. The mounting beam (212) is disposed on the outside of the side beam body (211), and the second buffer structure (23) is disposed on the outside of the mounting beam (212). The mounting beam (212) is configured to have mounting points for mounting the battery pack.

8. The box frame according to claim 1, characterized in that, An adhesive layer is sandwiched between the buffer strip (231) and the side beam (21) so that the buffer strip (231) is bonded to the side beam (21).

9. The box frame according to claim 1, characterized in that, The accommodating space is provided with a plurality of partitions (2111) arranged at intervals along the vertical direction to divide the accommodating space into a plurality of independent partitions (2112) distributed along the vertical direction. Each independent partition (2112) is filled with the first buffer structure (22). The filling volume of the first buffer structure (22) in each independent partition (2112) is 1 / 3 to 2 / 3 of the volume of each independent partition (2112).

10. A battery pack, characterized in that, It includes a battery module (100) and a housing frame according to any one of claims 1-9, wherein the battery module (100) is disposed within the housing frame.

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