Battery pack box body and battery pack

Abstract

The utility model provides a battery pack box body and a battery pack. The battery pack box body comprises a box body frame and an upper cover plate, the battery pack box body further comprises a supporting structure connected to the box body frame, and the supporting structure comprises two mounting parts which are respectively connected to the box body frame; and the supporting part is connected between the two mounting parts, crosses the cavity area of the box body frame and supports the upper cover plate. According to the battery pack box body disclosed by the utility model, the supporting structure is arranged between the box body frame and the upper cover plate, so that the upper cover plate above a larger cavity area in the box body frame can be supported in an auxiliary manner, the deformation of the upper cover plate is smaller when the upper cover plate is extruded downwards, and the abnormal sound of the battery pack box body is further reduced; when the upper cover plate is pressed, the supporting structure can transmit force to the box body frame, and the box body frame decomposes and dissipates the force, so that the structural strength and the anti-pressure capability of the battery pack box body are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of battery pack boxes, and particularly relates to a battery pack box. The utility model also relates to a battery pack equipped with the above battery pack box. Background Art

[0002] With the attention to safety performance and energy, the safety performance of the battery pack becomes increasingly important, and the structural strength of the battery pack will directly affect the overall safety performance of the battery pack. A battery pack is an integrated unit formed by assembling multiple battery modules, connectors, battery management systems, heat dissipation systems, electrical interfaces, battery pack boxes, etc., for storing and providing electrical energy.

[0003] The battery pack box includes a box frame and an upper cover plate. The battery module is arranged inside the box frame, and the upper cover plate covers the inside of the box frame to enclose the box frame. When the battery pack is used as an energy storage device on a vehicle, it is usually arranged at the lower part of the vehicle, under the floor. The upper cover plate of the battery pack box can support the vehicle floor. However, due to the arrangement form of components inside the box frame, there will be a relatively large cavity area, and the upper cover plate has no support from the battery module at this place. After the occupants enter the vehicle, they will step on the floor, and the floor will exert pressure on the top of the battery pack box. The support of the upper cover plate above the cavity area to the floor is insufficient, which may cause the battery pack box to deform and generate abnormal noises. Summary of the Utility Model

[0004] In view of this, the utility model aims to provide a battery pack box to reduce the abnormal noises generated by the battery pack box due to extrusion.

[0005] To achieve the above object, the technical solution of the utility model is realized as follows:

[0006] A battery pack box includes a box frame and an upper cover plate. The battery pack box further includes a support structure connected to the box frame. The support structure includes:

[0007] Two mounting parts, respectively connected to the box frame;

[0008] A support part, connected between the two mounting parts, spanning the cavity area of the box frame, and constituting the support for the upper cover plate.

[0009] Further, the support part is detachably connected to the mounting part, and the mounting part is welded to the box frame.

[0010] Further, the ratio of the length a of the support part to the total length L of the support structure is 0.9 - 0.95.

[0011] Further, the width d of the support part is the same as the height n, and the ratio between the width d of the support part and the total length L of the support structure is 0.01-0.02.

[0012] Further, the installation part is connected to the inner side wall of the box body frame, and the support part overlaps on the top of the installation part; the total height of the support structure is H, the height of the installation part is H-n, and the width m of the installation part = H-n≥2*d.

[0013] Further, the support part has connecting lugs, and bolt holes are provided on the connecting lugs. The bolt holes allow a bolt to pass through to form a bolt connection between the connecting lugs and the installation part.

[0014] Further, a buffer layer is filled between the support part and the upper cover plate.

[0015] Further, the longitudinal section of the support part is in the shape of "I", having two wing plates and a web plate fixedly connected between the two wing plates.

[0016] Further, an arched reinforcing rib is vertically and fixedly connected to the web plate. The foot of the reinforcing rib is fixedly connected to the lower wing plate, and the top of the reinforcing rib is fixedly connected to the upper wing plate.

[0017] Further, a support rib is vertically and fixedly connected to the web plate. The support rib is fixedly connected between the top end of the reinforcing rib and the lower wing plate.

[0018] Compared with the prior art, the present utility model has the following advantages:

[0019] For the battery pack box body of the present utility model, by arranging a support structure between the box body frame and the upper cover plate, it can play an auxiliary supporting role for the upper cover plate above a relatively large cavity area inside the box body frame, so that when the upper cover plate is subjected to downward extrusion, the deformation is small, thereby reducing the abnormal noise generated by the battery pack box body; when the upper cover plate is pressed, the force will first be transmitted to the support part, and then transmitted from the support part to the installation part. The installation part transmits the force to the box body frame, and the box body frame decomposes and dissipates the force, improving the structural strength and compressive capacity of the battery pack box body.

[0020] The support part and the installation part are detachably connected. When it is necessary to disassemble the battery pack, only the support part needs to be disassembled to disassemble the inside of the battery pack, improving the disassembly ability of the battery pack box body; welding the installation part to the box body frame can make the installation part have a high connection strength on the box body frame; the support part is bolt-connected to the installation part, making it convenient to disassemble the support part, and at the same time, the bolt connection can also firmly fix the support part and the installation part.

[0021] The ratio between the length a of the support part and the total length L of the support structure being 0.9 to 0.95 can reserve the installation space on the installation parts at both ends of the support part.

[0022] Setting d to be the same as n, with the ratio to L being 0.01 to 0.02, can enable the support part to have good bending strength while saving the use of materials.

[0023] The installation part is arranged on the inner wall of the box body frame, and the support part is lapped on the installation part, which neither affects the installation connection between the upper cover plate and the upper edge of the box body frame, nor can the support part fully support the upper cover plate; setting m = H - n ≥ 2*d can enable the support structure to provide good support stiffness.

[0024] The ear plates of the support part can facilitate bolt connection with the installation part and increase the contact area between the support part and the installation part.

[0025] Setting the buffer layer can prevent the support part from directly contacting and rubbing with the upper cover plate, so as to prevent the support part from wearing the upper cover plate, and at the same time can also play a buffering role for the upper cover plate.

[0026] Setting the support part to have an "I"-shaped cross-section can reduce the overall weight of the support part, and the support part also has good support strength for the upper cover plate, thereby enhancing the top strength of the battery pack box body.

[0027] Setting strengthening ribs between the wing plates can enhance the vertical support ability of the support part, and the arch-shaped strengthening ribs have strong force-bearing support ability and good support effect.

[0028] The support ribs can further support and reinforce the top of the strengthening ribs, so that the vertical compression resistance of the support part is improved and it is not easy to deform.

[0029] Another object of the present utility model is to provide a battery pack, and the battery pack is equipped with the battery pack box body as described above.

[0030] The battery pack described in the present utility model has the same beneficial effects as the battery pack box body as described above compared with the prior art, and will not be elaborated here. Description of the Drawings

[0031] The drawings constituting a part of the present utility model are used to provide a further understanding of the present utility model. The schematic embodiments of the present utility model and their descriptions are used to explain the present utility model and do not constitute an improper limitation to the present utility model. In the drawings:

[0032] Figure 1 It is a schematic structural diagram of the battery pack box body according to Embodiment 1 of the present utility model;

[0033] Figure 2Schematic diagram of the support structure and the buffer layer according to Embodiment 1 of the present utility model;

[0034] Figure 3 Front view of the support structure according to Embodiment 1 of the present utility model;

[0035] Figure 4 Right view of the support structure according to Embodiment 1 of the present utility model.

[0036] Explanation of reference numerals:

[0037] 1. Box body frame;

[0038] 2. Buffer layer;

[0039] 3. Support structure;

[0040] 301. Installation part; 302. Support part; 3021. Ear plate; 3022. Wing plate; 3023. Web plate; 3024. Reinforcing rib; 3025. Support rib; 303. Bolt. Detailed implementation manner

[0041] It should be noted that, without conflict, the embodiments in the present utility model and the features in the embodiments can be combined with each other.

[0042] In the description of the present utility model, it should be noted that if terms indicating orientation or positional relationship such as "upper", "lower", "inner", "outer", etc. appear, they are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model. In addition, if terms such as "first", "second", etc. appear, they are also only for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0043] In addition, in the description of the present utility model, unless otherwise clearly defined, the terms "installation", "connection", "connection", "connection member" 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 directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood in combination with specific situations.

[0044] The present utility model will be described in detail below with reference to the drawings and in combination with embodiments.

[0045] Embodiment 1

[0046] This embodiment relates to a battery pack housing, aiming to optimize the structure of the battery pack housing to enhance the structural strength and support capacity of the battery pack housing, thereby reducing abnormal noises generated when the battery pack housing is squeezed.

[0047] In terms of the overall structure, referring to Figures 1-4 as shown, a battery pack housing in this embodiment includes a housing frame 1 and an upper cover plate. The battery pack housing further includes a support structure 3 connected to the housing frame 1. The support structure 3 includes:

[0048] Two mounting parts 301, respectively connected to the housing frame 1.

[0049] A support part 302, connected between the two mounting parts 301, spanning the cavity area of the housing frame 1, and constituting a support for the upper cover plate.

[0050] With the above settings, for the battery pack housing of this embodiment, by providing the support structure 3 between the housing frame 1 and the upper cover plate, it can play an auxiliary support role for the upper cover plate above the relatively large cavity area inside the housing frame 1, so that when the upper cover plate is squeezed downward, the deformation is smaller, thereby reducing the abnormal noise emitted by the battery pack housing. When the upper cover plate is pressed, the force will first be transmitted to the support part 302, and then from the support part 302 to the mounting part 301. The mounting part 301 transmits the force to the housing frame 1, and the housing frame 1 decomposes and dissipates the force, improving the structural strength and compressive capacity of the battery pack housing.

[0051] Based on the above overall introduction, referring to Figure 1 and Figure 2 as shown, specifically, the housing frame 1 is a rectangular frame. Due to the arrangement of the internal battery modules, a relatively large cavity area will be formed on at least one side. There is no support from the battery modules at the corresponding upper cover plate of the cavity area, and large deformation will occur when it is pressed, resulting in abnormal noise. The support part 302 is strip-shaped and extends along the length direction of the cavity area to support the upper cover plate.

[0052] Regarding the specific arrangement form between the support part 302 and the mounting part 301, in this embodiment, the mounting part 301 is connected to the inner side wall of the housing frame 1, and the support part 302 is lapped on the top of the mounting part 301. By arranging the mounting part 301 on the inner wall of the housing frame 1 and lapping the support part 302 on the mounting part 301, it neither affects the installation connection between the upper cover plate and the upper edge of the housing frame 1, nor can the support part 302 fully support the upper cover plate.

[0053] For the convenience of disassembling and assembling the support portion 302, the support portion 302 is detachably connected to the mounting portion 301, and the mounting portion 301 is welded to the box body frame 1. When the operator needs to disassemble the components inside the box body frame 1, only by disassembling the support portion 302 can the blocking of the support structure 3 to the internal components of the battery pack be released, which has high operability and enables the battery pack box body to have a good disassembly function. It should be noted that if the components inside the battery pack box do not need to be disassembled from the support structure 3, the support portion 302 and the mounting portion 301 can also be fixedly connected, which can enhance the overall structural strength of the box body frame 1.

[0054] Secondly, welding the mounting portion 301 to the box body frame 1 can make the mounting portion 301 have a high connection strength on the box body frame 1 and is not easily detached under the action of external forces. The support portion 302 is bolted to the mounting portion 301, which makes it convenient to disassemble the support portion 302, and conventional tools can be used for disassembly and installation. The bolt connection method can firmly fix the support portion 302 and the mounting portion 301 and is not easily loosened during use. Of course, other detachable connection methods between the support portion 302 and the mounting portion 301 can also be selected, such as snap connection, plug connection, etc., as long as the detachable connection of the support portion 302 can be achieved.

[0055] For the purpose of increasing the connection strength between the support portion 302 and the mounting portion 301, the support portion 302 has connecting ear plates 3021. Bolt holes are provided on the connecting ear plates 3021, and a bolt is allowed to pass through the bolt holes to form a bolt connection between the connecting ear plates 3021 and the mounting portion 301. Ear plates 3021 are fixedly connected to both ends in the length direction of the support portion 302. The ear plates 3021 are arranged at the bottom end of the support portion 302 and extend away from the support portion 302. As a preferred implementation manner, the mounting portion 301 is cut from a rectangular pipe, through holes are provided at positions corresponding to the bolt holes of the support portion 302, the pipe mouth end abuts against the inner side wall of the box body frame 1 and is welded, and a part of the bottom of the free end is cut off to facilitate the installation of the bolt 303. The ear plates 3021 are abutted against the mounting portion 301, and the bolt 303 is used to sequentially pass through the bolt holes and the through holes and install nuts. After fastening, the support portion 302 and the mounting portion 301 can be firmly fixed.

[0056] In order to design the support part 302 to be lightweight, the longitudinal section of the support part 302 is in the shape of an "I" character, and has two wing plates 3022 and a web 3023 fixed between the two wing plates 3022. The use of the "I"-shaped cross section can reduce the weight of the support part 302 and achieve lightweight design. When the support part 302 with the "I"-shaped cross section is subjected to bending load, the stress can be distributed on the wing plates 3022 on the upper and lower sides, while the web 3023 mainly bears the shear force. This distribution method makes the support part 302 have higher bending strength and rigidity, and can withstand larger vertical loads without being easily deformed. Both ends of the support part 302 in the length direction are provided with sealing plates, and the sealing plates are welded to the ends of the two wing plates 3022 and the web 3023, which are used to enhance the structural strength of the support part 302 at the end, so that the end of the support part 302 is not easily deformed when it is bumped.

[0057] Furthermore, in order to enhance the load capacity of the support portion 302, an arched reinforcing rib 3024 is vertically fixed to the web 3023, the foot of the reinforcing rib 3024 is fixed to the lower wing plate 3022, and the top of the reinforcing rib 3024 is fixed to the upper wing plate 3022. The reinforcing rib 3024 is arranged between the wing plates 3022, which can enhance the vertical load capacity of the support portion 302. The reinforcing rib 3024 is arranged in an arched shape, the top of which is welded to the middle of the upper wing plate 3022, and the two feet are welded to the two ends of the lower wing plate 3022. When the support portion 302 is subjected to a load, the reinforcing rib 3024 can assist in transmitting and dispersing part of the force to the two ends, so that the support portion 302 has a better supporting capacity, reduces deformation under stress, and improves the supporting effect.

[0058] As a further reinforcement of the structure of the support portion 302, a support rib 3025 is vertically fixed to the web 3023, and the support rib 3025 is fixed between the top of the reinforcing rib 3024 and the lower wing plate 3022. The support rib 3025 is arranged in the middle of the support portion 302, and can support and connect the top of the reinforcing rib 3024 and the middle of the upper wing plate 3022 in the vertical direction, so as to maintain the middle distance between the upper and lower wing plates 3022, so that the upper and lower wing plates 3022 can be better positioned, thereby improving the support stability of the support portion 302.

[0059] In this embodiment, the web 3023 is symmetrically provided with reinforcing ribs 3024 and supporting ribs 3025 on both sides, so that the support portion 302 as a whole is more uniform when subjected to force, which is conducive to transmitting the force downward. Figure 4As shown in the figure, the total length of the support structure 3 is L, the total height is H, the length of the support part 302 is a, the lengths of the two side mounting parts 301 are c, the width is d, the height is n, and the thickness of the wing plate 3022 is t1. The length of the upper long side of the mounting part 301 is h, the length of the lower short side is i, the height of the long side part is j, the height of the short side part is k, the width of the rectangular tube for making the mounting part 301 is m, the height is H - n, and the thickness is t2. Figure 3 The dimension of the chamfer at the middle is R.

[0060] Based on the above dimension introduction, in this embodiment, L is the same as the inner width of the box body frame 1. a = (0.9 - 0.95) * L to leave installation positions for the bolts 303 on both sides of the mounting part 301. c = 20mm - 30mm, which can not only ensure the installation spacing of the bolts 303 but also enable the ear plate 3021 to have good structural strength at the bolt holes. d = n = (0.01 - 0.02) * L, which can make the bending stiffness of the support part 302 meet the requirements and save material costs. t1 ≥ 1.5mm to ensure the bending stiffness of the support part 302. h ≥ 4 * c, i ≥ c can leave a screwing space for the bolts 303 between the two side mounting parts 301 and the support part 302. t2 ≥ 1.5mm, j ≥ 5 * t2, k ≥ 2 * t2 can meet the structural strength of the mounting part 301. R ≥ 2mm can avoid stress concentration caused by sharp corners. m = H - n ≥ 2 * d. By setting like this, the support structure 3 can provide sufficient support stiffness.

[0061] A buffer layer 2 is filled between the support part 302 and the upper cover plate. Setting the buffer layer 2 can prevent the support part 302 from directly contacting and rubbing with the upper cover plate, so as to prevent the support part 302 from wearing the upper cover plate, and at the same time, it can also play a buffering role for the upper cover plate. In this embodiment, the buffer layer 2 is made of foam material, such as polyurethane foam, polyethylene foam, rubber foam, etc.

[0062] In this embodiment, by setting the support structure 3, the structural strength and load capacity of the battery pack box body are improved, and the situation of abnormal noise generated by the battery pack box body due to extrusion is reduced.

[0063] Embodiment Two

[0064] This embodiment relates to a battery pack, which is equipped with the battery pack box body of Embodiment One.

[0065] By assembling and using the battery pack box of the first embodiment in the battery pack, the anti-deformation ability of the battery pack when pressed from the top can be improved, thereby reducing the generation of abnormal noises. Secondly, the support structure can also enhance the overall stiffness of the battery pack, making the battery pack safer and more reliable during use. When the battery pack of this embodiment is used in a vehicle, the deformation of the top of the battery pack is relatively small when a member steps on the floor, and it is not easy to generate abnormal noises, which can correspondingly improve the NVH (Noise, Vibration, Harshness) performance of the vehicle and improve the vehicle use quality.

[0066] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A battery pack housing, comprising a housing frame and an upper cover plate, characterized in that, The battery pack housing further includes a support structure connected to the housing frame, and the support structure includes: Two mounting parts, respectively connected to the housing frame; A support part, connected between the two mounting parts, spanning the cavity area of the housing frame, and constituting a support for the upper cover plate.

2. The battery pack housing according to claim 1, wherein: The support part is detachably connected to the mounting part, and the mounting part is welded to the housing frame.

3. The battery pack housing according to claim 2, wherein: The ratio of the length a of the support part to the total length L of the support structure is 0.9 to 0.95; and / or, The width d of the support part is the same as the height n, and the ratio to the total length L of the support structure is 0.01 to 0.

02.

4. The battery pack housing according to claim 3, wherein: The mounting part is connected to the inner side wall of the housing frame, and the support part overlaps on the top of the mounting part; the total height of the support structure is H, the height of the mounting part is H - n, and the width m of the mounting part = H - n ≥ 2d.

5. The battery pack housing according to claim 2, wherein: The support part has a connecting ear plate, and bolt holes are provided on the connecting ear plate, and the bolt holes allow a bolt to pass through to form a bolt connection between the connecting ear plate and the mounting part.

6. The battery pack housing according to claim 1, wherein: A buffer layer is filled between the support part and the upper cover plate.

7. The battery pack housing according to any one of claims 1 to 6, wherein: The longitudinal section of the support part is in the shape of "I", having two wing plates and a web fixedly connected between the two wing plates.

8. The battery pack housing according to claim 7, wherein: An arched reinforcing rib is vertically and fixedly connected to the web, the foot of the reinforcing rib is fixedly connected to the lower wing plate, and the top of the reinforcing rib is fixedly connected to the upper wing plate.

9. The battery pack housing according to claim 8, wherein: A support rib is vertically and fixedly connected to the web, and the support rib is fixedly connected between the top of the reinforcing rib and the lower wing plate.

10. A battery pack, wherein: The battery pack is equipped with the battery pack housing according to any one of claims 1 to 9.

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