Support components, support devices, and the battery pack itself are used to support the bottom of the battery pack.

Abstract

This application relates to a support member, support device, and battery pack for the bottom of a battery pack, belonging to the technical field of battery packs. It absorbs impact energy and reduces cell deformation through the deformation of the support member; the support device consists of a sandwich structure of a bottom protective plate, the support member, and a liquid cooling plate, possessing high rigidity and cavity buffering energy absorption function; the liquid cooling plate is bonded to the battery module, and the casing is integrated with bolts for connection; additional reinforcing members further enhance local rigidity. This application, through structural optimization and layered collaborative design, absorbs impact energy through cross-sectional deformation, effectively reducing cell deformation and avoiding the energy absorption attenuation problem caused by plastic deformation in traditional rigid supports.

Description

Technical Field

[0001] This application relates to the field of battery pack technology, and in particular to a support member, support device, and battery pack for supporting the bottom of a battery pack. Background Technology

[0002] With the development of battery integration technology for new energy vehicles, compact design technology for high-energy-density battery packs has emerged. This technology optimizes the internal space layout of the battery pack to achieve high-density cell stacking and system lightweighting, thereby improving the driving range of electric vehicles.

[0003] To meet safety requirements under complex working conditions, related technologies often use a single support pad or simple reinforcing rib structure between the bottom protective plate and the liquid cooling plate to balance the deformation control of the water cooling plate and the protection requirements of the foundation.

[0004] However, the aforementioned traditional bottom protection methods have significant drawbacks: First, it is difficult to balance rigid support structures with energy absorption and buffering functions. Simple reinforcing ribs or foam supports are prone to plastic deformation under severe impact, leading to a rapid decline in energy absorption efficiency. Second, the bottom protection and thermal management system lack coordinated design. Existing support structures cannot achieve thermal-mechanical coupling optimization with liquid cooling plate channels, and the heat dissipation path is easily affected by impact deformation. Third, the structural parameters are coarse, lacking control over the size ratios for different working conditions (such as cavity width-to-height ratio, tower gradient ratio, etc.), making it difficult to balance protection effectiveness and space utilization. Summary of the Invention

[0005] Therefore, it is necessary to provide a support component, support device, and battery pack for supporting the bottom of the battery pack, so as to take into account both rigidity and energy absorption function, improve the bottom safety of the entire battery pack and the reliability of the cells during use, and have obvious economic benefits and value.

[0006] A support member for supporting the bottom of a battery pack, the support member comprising any one of the following structural forms or any combination of two or more of the following structures:

[0007] A square structure, including a long strip or variable cross-section support profile, is used to absorb impacts from the bottom, wherein the cross-section of the square structure does not include a hollow cavity;

[0008] The structure is shaped like a square, with a hollow cavity in the cross-section, which serves as a deformation buffer.

[0009] The hybrid structure has a cross-sectional shape consisting of multiple rectangular hollow cavities and / or square hollow cavities arranged side by side, which enable multi-energy deformation and buffer energy absorption through the rectangular and square cavities.

[0010] The pyramid-shaped structure has a cross-sectional shape set as a pyramid-shaped hollow cavity structure to achieve bottom energy absorption and buffering. The cross-section of the pyramid-shaped structure includes at least two rectangular cross-sections of different lengths.

[0011] The multi-cavity structure, with a cross-sectional shape consisting of multiple spaced-apart hollow cavities, achieves energy absorption and buffering by compressing these cavities under stress and deformation.

[0012] The flow channel structure includes a flow channel cavity that matches the flow channel of the liquid cooling plate, used to realize heat exchange and transfer between the liquid cooling plate and the flow channel;

[0013] The cross-sectional shape of the support member is configured to absorb impact energy and reduce cell deformation through deformation in the battery pack support device.

[0014] In one embodiment, the cross-section of the pyramid-shaped structure includes a first rectangular section at the top in the height direction, a second rectangular section in the middle, and a third rectangular section at the bottom, wherein the length of the second rectangular section is less than the length of the third rectangular section but greater than the length of the first rectangular section.

[0015] In one embodiment, the width of the first rectangular section at the top is 35% to 45% of the overall height.

[0016] In one embodiment, in the multi-cavity structure, the width of each cavity is 20% to 35% of the overall height, and the height of each cavity is 50% to 75% of the overall height.

[0017] On the other hand, this application also relates to a support device for supporting the bottom of a battery pack, comprising:

[0018] Such as the support structure used at the bottom of the battery pack;

[0019] The support member is positioned below the liquid cooling plate and connected to the bottom protective plate. The deformation of the support member absorbs the impact from the bottom to achieve cushioning.

[0020] A liquid cooling plate is positioned above the bottom protective plate, so that the support component is located between the bottom protective plate and the liquid cooling plate;

[0021] The battery module is in contact with and mounted on the liquid cooling plate.

[0022] The housing is used to house the battery modules;

[0023] The bottom protective plate, support member, and liquid cooling plate together form a sandwich structure. The deformation of the support member buffers and absorbs energy, thereby improving the impact resistance of the bottom of the battery pack.

[0024] In one embodiment, a reinforcing member is further provided between the support member and the bottom protective plate.

[0025] In one embodiment, the liquid cooling plate is bonded to the battery module by a thermally conductive structural adhesive, which provides thermal conductivity and connection.

[0026] In one embodiment, the liquid cooling plate is bolted to the housing.

[0027] In one embodiment, when the support is configured as a flow channel structure, the flow channel of the liquid cooling plate matches the flow channel cavity on the support to form an integrated heat exchange and energy absorption buffer channel.

[0028] On the other hand, this application also relates to a battery pack, including the aforementioned support device for supporting the bottom of the battery pack.

[0029] The aforementioned support components for supporting the bottom of the battery pack offer a variety of structural forms, which can be flexibly selected according to different working conditions. All structural forms can absorb impact energy through cross-sectional deformation, effectively reducing cell deformation and avoiding the energy absorption attenuation problem caused by plastic deformation in traditional rigid supports. The bottom protective plate, support components, and liquid cooling plate of this application form a layered structure. The deformation buffering and energy absorption of the support components and the rigid support of the liquid cooling plate work together to significantly improve the bottom impact resistance. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the battery pack support device of this application under an explosion condition.

[0031] Figure 2 This is a schematic diagram of the support structure in Embodiment 2 of this application.

[0032] Figure 3 for Figure 2 Sectional view along direction AA.

[0033] Figure 4 This is a schematic diagram of the support structure in Embodiment 3 of this application.

[0034] Figure 5 for Figure 4 BB-direction sectional view.

[0035] Figure 6 This is a schematic diagram of the support structure in Embodiment 4 of this application.

[0036] Figure 7 for Figure 6 CC-direction sectional view.

[0037] Figure 8 This is a schematic diagram of the support structure in Embodiment 5 of this application.

[0038] Figure 9 for Figure 8 DD section view.

[0039] Figure 10 This is a schematic diagram of the support structure in Embodiment Six of this application.

[0040] Figure 11 for Figure 10 EE section view.

[0041] The components are as follows: 100, battery module; 200, liquid cooling plate; 300, housing; 400, support component; 500, bottom protective plate; 600, reinforcing component. Detailed Implementation

[0042] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0043] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and 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 this application.

[0044] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0045] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., 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, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0046] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0047] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0048] Example 1:

[0049] See Figure 1 , Figure 1 The diagram shows an exploded state of the support device in one embodiment of this application. The battery pack support device provided in one embodiment of this application includes a bottom protective plate 500, a support member 400, a liquid cooling plate 200, a battery module 100, and a housing 300.

[0050] In this embodiment, the support member 400 is a square structure with a long strip or variable cross-section profile, and is installed between the bottom protective plate 500 and the liquid cooling plate 200. When the bottom is impacted, the support member 400 absorbs energy through the deformation of the square structure, reducing the impact force transmitted to the battery module 100.

[0051] In this embodiment, the bottom protective plate 500, the support member 400 and the liquid cooling plate 200 are connected by bolts to form a sandwich structure. The liquid cooling plate 200 is bonded to the battery module 100 by thermally conductive structural adhesive to ensure heat transfer efficiency.

[0052] In this embodiment, a reinforcing member 600 is added between the support member 400 and the bottom protective plate 500 to improve local rigidity.

[0053] Example 2:

[0054] Please see Figures 2 to 3 In this embodiment, the support member 400 adopts a U-shaped cavity structure, the cross-section of which is composed of a closed hollow cavity (e.g., Figure 3 (As shown in the AA section). When the bottom is impacted, the hollow cavity absorbs energy through the compression deformation of the sidewalls, while the deformation inside the cavity is coordinated to avoid stress concentration.

[0055] In this embodiment, the flow channel of the liquid cooling plate 200 does not directly interfere with the hollow cavity, ensuring that the thermal management system operates independently.

[0056] In this embodiment, the bottom protective plate 500 is fixed to the box body 300 by bolts, and the deformation of the support member 400 is controlled by the cavity height.

[0057] Example 3:

[0058] Please see Figures 4 to 5 In this embodiment, the support member 400 adopts a hybrid structure, the cross-section of which consists of rectangular cavities and square cavities arranged side by side (e.g., Figure 5 (As shown in the BB section).

[0059] In this embodiment, different cavities deform sequentially under impact load. The rectangular cavity absorbs energy primarily through lateral bending, while the square cavity further buffers energy through axial compression, thus achieving multi-stage energy absorption.

[0060] Example 4:

[0061] Please see Figures 6 to 7 In this embodiment, the support member 400 adopts a pyramid-shaped structure. The cross-section of the pyramid-shaped structure includes a first rectangular section at the top in the height direction, a second rectangular section in the middle, and a third rectangular section at the bottom, wherein the length of the second rectangular section is less than the length of the third rectangular section and greater than the length of the first rectangular section.

[0062] For example, the cross-section of the pyramid-shaped structure is divided from top to bottom into a pyramid-shaped top, a drum-shaped middle section, and a pedestal-shaped bottom (e.g., Figure 7 (As shown in the CC section).

[0063] In this embodiment, the cross-sectional shape of the support member 400 is set as a tower-shaped structure with increasing width to optimize the distribution of impact loads.

[0064] Specifically, the top width is 35%-45% of the overall height, the width increases in the middle, and the bottom surface is in contact with the bottom guard plate 500. When subjected to impact, the impact load is dispersed by the top conical structure, the middle waist drum-shaped cavity absorbs energy through radial expansion, and the bottom pedestal-shaped structure provides stable support.

[0065] In this embodiment, the liquid cooling plate 200 is connected to the housing 300 by bolts, and the tower-shaped gradient design of the support 400 optimizes the load distribution and reduces the risk of cell deformation.

[0066] Example 5:

[0067] Please see Figures 8 to 9 In this embodiment, the support member 400 adopts a multi-cavity structure, and its cross-section is composed of multiple independent cavities arranged side by side (e.g., Figure 9 (As shown in the DD cross-section).

[0068] In this embodiment, the width of each cavity is 20%-35% of the overall height, and the height is 50%-75% of the overall height. When the cavity is impacted, the adjacent cavities deform and squeeze each other, which enhances the energy absorption efficiency.

[0069] Example 6:

[0070] Please see Figures 10 to 11 In this embodiment, the support member 400 adopts a flow channel structure, and its cross-section is provided with a flow channel cavity that matches the flow channel of the liquid cooling plate 200 (e.g., Figure 11 (As shown in the EE cross-section).

[0071] In this embodiment, the cooling channel of the liquid cooling plate 200 is embedded in the cavity of the support member 400 to form an integrated heat exchange channel; under impact load, the channel cavity absorbs energy through deformation, while the coolant circulates in the channel to achieve thermal-mechanical synergistic optimization.

[0072] In this embodiment, the bottom protective plate 500 and the box body 300 are fixed with bolts to ensure structural sealing.

[0073] In all the above embodiments, the bottom protective plate 500, the support member 400, and the liquid cooling plate 200 constitute a sandwich structure. The deformation energy absorption of the support member 400 complements the rigid support of the liquid cooling plate 200. The liquid cooling plate 200 is bonded to the battery module 100 with thermally conductive structural adhesive and connected to the housing 300 with bolts to ensure overall stability. When a flow channel structure is adopted, the integrated flow channel design of the liquid cooling plate 200 and the support member 400 improves both heat dissipation efficiency and impact resistance.

[0074] In summary, the support member 400 of this application achieves efficient absorption of impact energy and control of cell deformation through various structural designs. The bottom protective plate 500, support member 400, and liquid cooling plate 200 of this application constitute a sandwich structure, which significantly improves the stability and safety of the bottom of the battery pack.

[0075] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0076] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A support for supporting a bottom of a battery pack, characterized by, The support member (400) includes any of the following structural forms or any combination of two or more structures: A square structure, including a long strip or variable cross-section support profile, is used to absorb impacts from the bottom, wherein the cross-section of the square structure does not include a hollow cavity; The structure is shaped like a square, with a hollow cavity in the cross-section, which serves as a deformation buffer. The hybrid structure has a cross-sectional shape consisting of multiple rectangular hollow cavities and / or square hollow cavities arranged side by side, which enable multi-energy deformation and buffer energy absorption through the rectangular and square cavities. The pyramid-shaped structure has a cross-sectional shape set as a pyramid-shaped hollow cavity structure to achieve bottom energy absorption and buffering. The cross-section of the pyramid-shaped structure includes at least two rectangular cross-sections of different lengths. The multi-cavity structure has a cross-sectional shape consisting of multiple spaced-apart hollow cavities. These cavities deform under stress and then compress against each other to achieve energy absorption and buffering. as well as The flow channel structure includes a flow channel cavity that matches the flow channel of the liquid cooling plate (200) for heat exchange and transfer between the liquid cooling plate (200); The cross-sectional shape of the support member (400) is configured in the battery pack support device to absorb impact energy and reduce cell deformation through deformation.

2. The support for supporting a battery pack bottom according to claim 1, characterized by, The cross-section of the pyramid-shaped structure includes a first rectangular section at the top, a second rectangular section in the middle, and a third rectangular section at the bottom in the height direction, wherein the length of the second rectangular section is less than the length of the third rectangular section but greater than the length of the first rectangular section.

3. The support for supporting a battery pack bottom according to claim 2, characterized by, The width of the first rectangular section at the top is 35% to 45% of the overall height.

4. The support for supporting a battery pack bottom according to claim 1, characterized by, In the multi-cavity structure, the width of each cavity is 20% to 35% of the overall height, and the height of each cavity is 50% to 75% of the overall height.

5. A support device for supporting a bottom of a battery pack, characterized by, include: Support (400) for the bottom of the battery pack as described in any one of claims 1 to 4; The support member (400) is disposed below the liquid cooling plate (200) and connected to the bottom protective plate (500). The support member (400) deforms to absorb the impact at the bottom to achieve buffering. A liquid cooling plate (200) is disposed above the bottom protective plate (500), so that the support member (400) is located between the bottom protective plate (500) and the liquid cooling plate (200); The battery module (100) is in contact with the liquid cooling plate (200) and is disposed on the liquid cooling plate (200); A housing (300) for accommodating the battery module (100); The bottom protective plate (500), the support member (400) and the liquid cooling plate (200) together form a sandwich structure. The deformation of the support member (400) buffers and absorbs energy, thereby improving the impact resistance of the bottom of the battery pack.

6. The support apparatus for supporting a battery pack bottom according to claim 5, characterized by, A reinforcing member (600) is also provided between the support member (400) and the bottom guard plate (500).

7. The support apparatus for supporting a battery pack bottom according to claim 5, characterized by, The liquid cooling plate (200) is bonded to the battery module (100) by thermally conductive structural adhesive, which provides thermal conductivity and connection.

8. The support device for supporting the bottom of a battery pack according to claim 5, characterized in that, The liquid cooling plate (200) is bolted to the housing (300).

9. The support apparatus for supporting a battery pack bottom according to claim 5, characterized by, When the support member (400) is configured as a flow channel type structure, the flow channel of the liquid cooling plate (200) matches the flow channel cavity on the support member (400) to form an integrated heat exchange and energy absorption buffer channel.

10. A battery pack, characterized by, Includes a support device for supporting the bottom of the battery pack as described in any one of claims 5 to 9.

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