Battery pack housing and battery pack

Abstract

This utility model belongs to the field of battery technology and discloses a battery pack housing and a battery pack. The battery pack housing includes a base plate and a frame. The frame is installed on the base plate, and multiple frames are provided. The multiple frames and the base plate together form a receiving cavity. At least one frame has a cavity, and the top of the frame has a filling hole communicating with the cavity. Foam is poured into the cavity through the filling hole, so that the foam extends towards both ends along the length direction of the frame. The radial cross-sectional area of ​​the filling hole is S. The cured foam forms a buffer structure with a length L1 ranging from 0.014 to 3.15. By setting the range of 0.014 to 3.15, it is ensured that the foam poured from the filling hole can fill the cavity towards both ends along the length direction of the frame, which helps to improve the uniformity of filling in the cavity.

Description

Technical Field

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

[0002] Most battery pack enclosures use hollow, irregularly shaped profiles (such as extruded aluminum). These profiles are relatively thin, have limited internal support area, and are generally weak in rigidity. This makes the battery pack enclosure prone to deformation under impact, resulting in poor impact resistance and potential damage to the batteries or other components inside. Related technologies typically fill the battery pack enclosure frame with expanding foam. However, during the filling process, foam is usually injected from one end of the cavity, making it difficult to ensure the cavity is completely filled along its length.

[0003] Therefore, there is an urgent need for a battery pack housing and battery pack to solve the above-mentioned technical problems. Utility Model Content

[0004] The purpose of this utility model is to provide a battery pack housing and battery pack, which aims to solve the problem in the prior art that when filling the frame of the battery pack housing with expanding foam, it is usually poured from one end of the cavity in the frame, which makes it difficult to ensure that the cavity is filled with expanding foam along its length. The battery pack housing and battery pack can ensure that the expanding foam poured from the filling hole fills the cavity at both ends along the length of the frame, thereby improving the uniformity of the filling in the cavity.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] A battery pack housing includes a base plate and a frame. Multiple frames are mounted on the base plate, and the multiple frames and the base plate together form a receiving cavity. At least one frame has a cavity. The top of each frame has a potting hole communicating with the cavity. Expanding foam is injected into the cavity through the potting hole, causing the expanding foam to extend along both ends of the frame's length. The radial cross-sectional area of ​​the potting hole is S. The cured expanding foam forms a buffer structure with a length L1. The range is 0.014-3.15.

[0007] A battery pack, comprising a battery pack housing as described above.

[0008] The beneficial effects of this utility model are:

[0009] The battery pack housing provided by this utility model has a potting hole at the top of the frame that communicates with the cavity. Expanding foam is poured into the cavity through the potting hole, causing the foam to extend towards both ends along the length of the frame. The radial cross-sectional area of ​​the potting hole is S, and the length of the buffer structure is L1. This is achieved by setting... The range is 0.014-3.15, ensuring that the expanding foam injected from the injection hole fills the cavity in both directions along the length of the frame, which helps improve the uniformity of the filling within the cavity. If If the value is too large, it can easily lead to poor structural strength of the border; if If the value is too small, it can easily lead to low glue-filling efficiency and fail to meet glue-filling requirements. In addition, by setting up a buffer structure, the buffering capacity of the battery pack housing under long-term vibration or impact is improved.

[0010] The battery pack provided by this utility model includes a battery pack body as described above. The expanding foam injected from the injection hole can fill the cavity in both directions along the length of the frame, resulting in high uniformity of injection. By setting a buffer structure, the battery pack has a strong buffering capacity when subjected to vibration or impact for a long time. Attached Figure Description

[0011] Figure 1 This is a top view of the battery pack provided in an embodiment of the present utility model;

[0012] Figure 2 This is a schematic diagram of the structure of the battery pack housing provided in this embodiment of the utility model;

[0013] Figure 3 This is a schematic diagram of the assembly structure of the frame or beam structure filled with expanding foam provided in this embodiment of the utility model;

[0014] Figure 4 This is a schematic diagram of the cavity structure of the frame or beam structure provided in the embodiment of this utility model;

[0015] Figure 5 This is a schematic diagram of a frame or beam structure with a potting hole provided in an embodiment of the present invention;

[0016] Figure 6 This is a schematic diagram of L2 and L3 according to an embodiment of the present utility model;

[0017] Figure 7 This is a schematic diagram of L4 according to an embodiment of the present utility model;

[0018] Figure 8 This is a schematic diagram of L5 according to an embodiment of the present utility model;

[0019] Figure 9 This is a schematic diagram of a frame or beam structure with two glue-filling holes provided in an embodiment of the present invention;

[0020] Figure 10 This is a three-dimensional view of the battery pack housing according to the first embodiment of this utility model;

[0021] Figure 11 yes Figure 10 A magnified view of a section at point C;

[0022] Figure 12 This is a three-dimensional view of the crossbeam provided in this embodiment of the utility model;

[0023] Figure 13 yes Figure 12 A magnified view of a section at point D;

[0024] Figure 14 yes Figure 12 A magnified view of a section at point E in the middle;

[0025] Figure 15 This is a three-dimensional view of the longitudinal beam provided in this embodiment of the utility model;

[0026] Figure 16 yes Figure 15 A magnified view of a section at point F in the middle;

[0027] Figure 17 yes Figure 15 A magnified view of a section at point G in the middle;

[0028] Figure 18 yes Figure 15 A magnified view of a section at point H in the middle;

[0029] Figure 19 This is a three-dimensional view of the battery pack housing according to the second embodiment of this utility model.

[0030] In the picture:

[0031] 100, Frame; 200, Glue-filling hole; 300, Base plate; 400, Beam structure; 410, Crossbeam; 411, Second slot; 420, Longitudinal beam; 421, First slot; 430, Sub-beam body; 500, Battery unit; 600, Connector; 610, Fixing part; 620, Overlapping part; 700, First threaded part; 800, Second threaded part; 900, Connecting post; 910, Connecting groove; 1000, Third threaded part; 1100, Connecting structure; 1110, First connecting piece; 1120, Second connecting piece; 1130, Support piece; 1200, Fourth threaded part; 1300, Buffer structure; 1400, Cavity; 1410, Separating cavity; 1500, Horizontal isolation rib. Detailed Implementation

[0032] 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.

[0033] 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.

[0034] 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.

[0035] In the description of this embodiment, the terms "upper," "lower," "right," 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.

[0036] A battery pack typically includes battery cells (composed of multiple individual battery cells connected in series and / or parallel), a battery management system (BMS), a thermal management system, electrical connection systems (high-voltage / low-voltage connectors, wiring harnesses, etc.), structural components (casing, brackets, etc.), and protective parts. A battery pack is a complete functional unit that directly outputs electrical energy by placing the above components inside a battery pack housing and sealing it with a cover. As a rechargeable battery, the battery pack is the power source for new energy vehicles.

[0037] A battery pack enclosure is a closed or semi-closed structure made of materials such as metal and plastic. It serves as the physical carrier of the battery cells, and its design and manufacturing must meet the safety, reliability, and functionality requirements of the battery pack under different usage scenarios. The battery pack enclosure provides installation space for the battery cells, BMS, thermal management system, electrical connection system, etc., and through a reasonable structural design, fixes these components within the enclosure, ensuring they maintain a relatively stable position during battery pack operation and preventing damage or loosening of connections due to vibration, impact, or other factors. The shape of the battery pack enclosure can be cylindrical, cuboid, cube, etc.

[0038] like Figures 1 to 19 As shown, this embodiment provides a battery pack housing, including a base plate 300 and a frame 100. Multiple frames 100 are mounted on the base plate 300, and the multiple frames 100 and the base plate 300 together form a receiving cavity. At least one frame 100 has a cavity 1400. The top of the frame 100 has a potting hole 200 communicating with the cavity 1400. Expanding foam is injected into the cavity 1400 through the potting hole 200, causing the expanding foam to extend towards both ends along the length of the frame 100. The radial cross-sectional area of ​​the potting hole 200 is S. The cured expanding foam forms a buffer structure 1300 with a length L1. The range is 0.014-3.15. For example, The range can be any value from 0.014, 0.016, 0.018, 0.02, 0.5, 0.8, 1.2, 1.8, 2, 2.8, 3.15 or 0.014-3.15.

[0039] The battery pack housing provided in this embodiment has a potting hole 200 at the top of the frame 100 that communicates with the cavity 1400. Expanding foam is injected into the cavity 1400 through the potting hole 200, causing the foam to extend towards both ends along the length of the frame 100. The radial cross-sectional area of ​​the potting hole 200 is S, and the length of the buffer structure 1300 is L1. [The last sentence appears to be incomplete and possibly refers to a different embodiment.] The range is 0.014-3.15, ensuring that the expanding foam injected from the injection hole 200 fills the cavity 1400 in the direction of both ends along the length of the frame 100, which helps to improve the uniformity of the filling within the cavity 1400. If If the value is too large, it can easily lead to poor structural strength of the 100mm border; if... If the value is too small, it will easily lead to low glue-filling efficiency and fail to meet the glue-filling requirements. In addition, by setting the buffer structure 1300, the buffering capacity of the battery pack box under long-term vibration or impact is improved.

[0040] Optionally, the diameter of the potting hole 200 is d, where 6mm < d < 20mm, and 28mm is an acceptable value.2 <S<315mm 2 If the area of ​​the dispensing hole 200 is too large, the flow rate of the foaming adhesive will be too fast during the dispensing process, easily leading to overflow. Furthermore, the high flow rate will trap air, forming bubbles and affecting structural strength. If the area of ​​the dispensing hole 200 is too small, the adhesive flow will be limited, affecting the continuity of dispensing and resulting in low dispensing efficiency. For example, d can be 8mm, 10mm, 12mm, 15mm, or 18mm, etc., and can be set as needed.

[0041] Optionally, 100mm < L1 < 2000mm. If the length L1 of the buffer structure 1300 is too large, it may cause uneven internal cell structure, leading to uneven heat dissipation during curing and affecting overall strength. If the length L1 of the buffer structure 1300 is too small, it will reduce the effective bonding area, resulting in weak adhesion. For example, L1 can be 120mm, 260mm, 500mm, 800mm, or 2000mm, etc., and can be set as needed.

[0042] See Figure 6 Optionally, the distance between the potting hole 200 and the end face of the first end of the frame 100 is L2, and the length of the frame 100 is L3. The range is 0.2-0.8. This can be achieved by setting... The range is 0.2-0.8, ensuring that the expanding foam injected through the injection hole 200 can evenly fill both ends of the frame 100 along its length, improving the uniformity of the filling within the cavity 1400, and thus effectively enhancing the overall impact resistance of the battery pack housing. It should be noted that the middle area of ​​the frame has a weaker impact resistance; this is addressed by limiting... The range ensures that the expanding foam injected through the injection hole 200 can evenly fill both ends of the frame 100 along its length, and also better ensures the structural strength of the frame approximately in the middle area. For example, The range can be any value among 0.2, 0.4, 0.6, 0.7, 0.8, or 0.2-0.8.

[0043] Preferably, the top of the frame 100 is provided with a plurality of glue-filling holes 200, which are spaced apart along the length of the frame 100. By providing a plurality of glue-filling holes 200 spaced apart along the length of the frame 100 at the top of the frame 100, the glue filling degree and glue uniformity in the cavity 1400 are improved.

[0044] See Figure 7In this embodiment, the distance between adjacent injection holes 200 is L4, and the range of L4 is 40cm-150cm. If the value of L4 is too large, it will affect the uniformity of the distribution of the expanding foam in the cavity 1400 and reduce the impact resistance; if the value of L4 is too small, it will not be conducive to the flow of liquid expanding foam towards both ends of the frame 100 along the length direction. For example, the range of L4 can be any value among 40cm, 50cm, 55cm, 60cm, 70cm, 80cm, 90cm, 100cm, 120cm, 140cm, 150cm or 40cm-150cm.

[0045] See Figure 8 In one possible implementation, the distance between adjacent buffer structures 1300 corresponding to adjacent potting holes 200 is L5, where L5 < 10cm. If the value of L5 is too large, the filling amount of the buffer structure 1300 in the cavity 1400 will be too small, reducing the impact resistance. For example, L5 can be 8cm, 7cm, 6cm, or 5cm, etc., and can be set as needed.

[0046] See Figure 9 In another possible implementation, adjacent buffer structures 1300 corresponding to adjacent potting holes 200 are in contact with each other. By setting adjacent buffer structures 1300 corresponding to adjacent potting holes 200 to be in contact with each other, the filling uniformity and fullness of the buffer structures 1300 in the cavity 1400 are improved.

[0047] In this embodiment, at least one horizontal isolation rib 1500 parallel to the base plate 300 is provided within the cavity 1400. The horizontal isolation rib 1500 divides the cavity 1400 into at least two partition chambers 1410. The horizontal isolation rib 1500 has through holes corresponding to the glue-filling holes 200. Expanding foam is injected into the entire cavity 1400 through the glue-filling holes 200, and each partition chamber 1410 is filled with foam through the through holes. After the foam cures, it forms a buffer structure 1300. The combination of the buffer structure 1300 and the horizontal isolation rib 1500 helps to improve the overall impact resistance of the frame 100. Figure 4 As shown, exemplarily, three horizontal isolation ribs 1500 are provided within the cavity 1400, dividing the cavity 1400 into four partitioned chambers 1410. The four partitioned chambers 1410 are spaced apart and stacked. In other embodiments, the number of partitioned chambers 1410 can be set to other values, such as three or five, as needed. Exemplarily, the horizontal isolation ribs 1500 also include additional through-holes that do not correspond to the glue-filling hole 200 to improve the flowability of the foamed adhesive.

[0048] Alternatively, at least one vertical isolation rib is provided in the cavity 1400, which is perpendicular to the base plate 300. The vertical isolation rib divides the cavity 1400 into at least two partition cavities 1410, and the vertical isolation rib is provided with a through hole connecting the two adjacent partition cavities 1410.

[0049] Preferably, the via is positioned 300 mm away from the base plate, which helps to improve the flowability of the foam adhesive.

[0050] Optionally, a plurality of reinforcing ribs are provided within the cavity 1400, and the reinforcing ribs are connected to two opposite sidewalls of the cavity 1400. The reinforcing ribs increase the strength of the frame 100 without affecting the flow of the expanding foam. Exemplarily, the reinforcing ribs can be welded to the frame 100 or integrally formed, depending on the requirements.

[0051] Optionally, the first end of the cavity 1400 is left open and sealed by a sealing structure, which helps to reduce wind noise. Exemplarily, the sealing structure can be a sealant structure, prepared by a potting process.

[0052] Preferably, the bottom of the frame 100 is provided with a glue-filling hole 200. That is, providing glue-filling holes 200 at both the bottom and top of the frame 100 is beneficial to improving glue-filling efficiency.

[0053] The battery pack housing in this embodiment also includes a beam structure 400. The beam structure 400 is mounted on the base plate 300 and divides the accommodating cavity into at least two sub-cavities for mounting the battery units 500. The beam structure 400 has a cavity 1400, and the top of the beam structure 400 is provided with a potting hole 200 communicating with the cavity 1400. Foaming adhesive is poured into the cavity 1400 through the potting hole 200. The foaming adhesive is poured into the cavity 1400 through the potting hole 200 so that the foaming adhesive extends to both ends along the length direction of the beam structure 400 to fill the cavity 1400, thereby improving the uniformity of potting adhesive in the cavity 1400.

[0054] In one possible implementation, the beam structure 400 includes a horizontal beam 410 and a longitudinal beam 420 arranged perpendicularly to each other. The horizontal beam 410 overlaps with the longitudinal beam 420. At least one of the horizontal beam 410 and the longitudinal beam 420 may be provided with a cavity 1400, and the horizontal beam 410 and the longitudinal beam 420 are detachably connected by a connector 600. This improves the ease of assembly and disassembly.

[0055] Optionally, each compartment contains a battery unit 500, which includes several battery modules arranged side-by-side. The battery modules in adjacent battery units 500 are arranged in the same direction or intersect each other. Figure 1As shown, one crossbeam 410 and one longitudinal beam 420 are each provided. The crossbeam 410 and the longitudinal beam 420 divide the accommodating cavity into four sub-cavities. The battery structure includes four battery units 500, with one battery unit 500 disposed in each sub-cavity. The battery modules of each battery unit 500 are arranged in the same direction. In other embodiments, the arrangement directions of the battery modules of adjacent battery units 500 can be set to intersect each other. For example, the arrangement directions of adjacent battery units 500 can be perpendicular to each other, etc., as needed.

[0056] like Figures 10 to 18 As shown, optionally, the longitudinal beam 420 has a first slot 421 for accommodating a portion of the crossbeam 410, and the crossbeam 410 has a second slot 411 for accommodating a portion of the longitudinal beam 420. The connector 600 includes a fixing part 610 and an overlapping part 620. Two fixing parts 610 are provided, and the two fixing parts 610 are respectively provided at both ends of the overlapping part 620. The overlapping part 620 is provided on the crossbeam 410 and connected to the crossbeam 410 through a first threaded member 700. The fixing part 610 is provided on the longitudinal beam 420, and the two fixing parts 610 are respectively located on both sides of the crossbeam 410. The fixing part 610 is connected to the longitudinal beam 420 through a second threaded member 800. During assembly, the crossbeam 410 overlaps with the longitudinal beam 420, part of the crossbeam 410 is stored in the first slot 421, and part of the longitudinal beam 420 is stored in the second slot 411. Then the connector 600 is connected to the crossbeam 410 and the longitudinal beam 420 respectively. The operation is simple and the disassembly and assembly are convenient.

[0057] In this embodiment, a connecting post 900 protrudes from the inner side of the frame 100, and a connecting groove 910 is recessed on the end face of the connecting post 900. A through hole is provided in the crossbeam 410, penetrating both ends along its length. The connecting post 900 is inserted into the through hole and connected to the crossbeam 410 via a third threaded component 1000. During assembly, after the connecting post 900 is inserted into the through hole, the third threaded component 1000 passes sequentially through the cavity wall of the crossbeam 410 and the groove wall of the connecting groove 910, fixing the connecting post 900 and the crossbeam 410. This method is simple to operate and convenient to assemble and disassemble.

[0058] Optionally, the distance between the dispensing hole 200 and the end face of the connecting groove 910 is not less than 10mm. This setting avoids the dispensing hole 200 and the end face of the connecting groove 910 being too small, which would affect the flowability of the expanding foam. For example, the distance between the dispensing hole 200 and the end face of the connecting groove 910 can be 10mm, 12mm, 13mm, 15mm, 18mm, or 30mm, etc., and can be set as needed.

[0059] Optionally, the end of the longitudinal beam 420 is connected to the frame 100 via a connecting structure 1100. The connecting structure 1100 includes a first connecting piece 1110 and a second connecting piece 1120 that are parallel to each other, and a support piece 1130 that connects the first connecting piece 1110 and the second connecting piece 1120. The first connecting piece 1110 is attached to the longitudinal beam 420 and connected to the longitudinal beam 420 via a fourth threaded component 1200. The second connecting piece 1120 is attached to the frame 100 and connected via a fifth threaded component. The support piece 1130 raises the height of the second connecting piece 1120, ensuring that the second connecting piece 1120 and the top surface of the frame 100 are fully fitted together, resulting in stable and reliable assembly.

[0060] In another possible implementation, the beam structure 400 includes a sub-beam 430, both ends of which are connected to the frame 100 to divide the accommodating cavity into at least two sub-cavities, each containing a battery unit 500, and the sub-beam 430 having a cavity 1400. Figure 19 As shown, the beam structure 400 includes a sub-beam 430 parallel to the length direction of the battery pack, which divides the accommodating cavity into two sub-cavities. In other embodiments, the number of sub-beams 430 can be set as needed.

[0061] Optionally, the frame 100 may be made of metal; and / or the beam structure 400 may be made of metal or plastic. By making the frame 100 of metal, such as aluminum alloy, the metal material effectively ensures sufficient strength and improves impact resistance. The beam structure 400 may be made of metal or plastic, such as aluminum alloy or polytetrafluoroethylene (PTFE). Metal ensures high strength, while plastic is easy to process, has low manufacturing costs, and is lightweight. In actual implementation, the specific material can be selected according to the needs.

[0062] In this embodiment, the thickness d1 of the frame 100 is ≥ 1.5 mm; the thickness d2 of the beam structure 400 is ≥ 1.5 mm. This setting avoids the overall strength of the battery pack being too low due to the small thickness of the frame 100 and the beam structure 400. For example, the thickness d1 of the frame 100 can be set to 1.5 mm, 2 mm, 3 mm, 4 mm, 5 mm, or 6 mm, etc.; the thickness d2 of the beam structure 400 can be set to 1.5 mm, 2 mm, 3 mm, 4 mm, 5 mm, or 6 mm, etc.

[0063] Preferably, the density of the buffer structure 1300 is 0.1-0.5; and / or, the elastic modulus of the buffer structure 1300 is greater than 70 MPa; and / or, the shear strength of the buffer structure 1300 is greater than 1.5 MPa. During the molding process, the liquid foam is filled with gas and expands in volume. Upon impact, it bubbles, deforms, and compresses, thereby absorbing energy and protecting the battery cell. Secondly, liquid foam is a special form of structural adhesive with a high degree of chemical cross-linking, forming a high-strength polymer after curing. Furthermore, during the curing process, the chemical groups in the liquid foam actively adsorb onto the surface groups of the substrate, thus forming a bond between the adhesive and the substrate. The buffer structure 1300 simultaneously possesses energy absorption, reinforcement, and adhesion functions, enabling it to effectively protect the frame 100 and the beam structure 400. For example, the density of the cured foam structure can be any value among 0.1, 0.2, 0.3, 0.4, 0.5 or 0.1-0.5; the elastic modulus of the cured foam structure can be 80MPa, 85MPa, 90MPa or 100MPa, etc.; and the shear strength of the cured foam structure can be 2MPa, 5MPa or 20MPa, etc.

[0064] Optionally, the foaming material can be organic or inorganic. Organic foaming materials have better elasticity and aging resistance, and are lightweight, reducing the overall weight of the battery pack casing. Inorganic foaming materials effectively isolate moisture and humidity; their water solubility makes them non-flammable and releases fewer harmful gases, resulting in higher safety. Organic foaming materials can be based on organic polymers such as polyurethane or acrylic acid, achieving foaming through chemical reactions or physical foaming agents. Inorganic foaming materials can be based on inorganic materials such as carbonates or sodium silicate, achieving foaming through physical or chemical decomposition to generate gas. In specific implementations, the specific material of the foaming material can be selected according to requirements.

[0065] In this embodiment, organic or inorganic foam adhesive is injected into the filling hole 200 through the injection structure. Exemplarily, the injection structure includes a funnel and a dispensing section that are interconnected. The dispensing section is located at the small end of the funnel. During injection, the injection structure overlaps above the filling hole 200, so that the dispensing nozzle of the dispensing section is aligned with the filling hole 200. The glue gun injects liquid foam adhesive from the large end of the funnel, and the liquid foam adhesive flows into the filling hole 200 through the small end of the funnel and the dispensing section. By providing an injection structure with an interconnected funnel and dispensing section, the funnel facilitates the injection of liquid foam adhesive into the injection structure; the dispensing section allows a portion of the injection structure to extend into the filling hole 200, ensuring that the liquid foam adhesive can smoothly enter the filling hole 200, thus improving the ease and efficiency of injecting liquid foam adhesive into the filling hole 200.

[0066] This embodiment also provides a battery pack, including the battery pack housing described above. Foam injected from the injection hole 200 can fill the cavity 1400 in both directions along the length of the frame 100, resulting in high injection uniformity.

[0067] 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 battery pack case characterized by comprising: include: A base plate (300) and a frame (100) are provided. The frame (100) is installed on the base plate (300). Multiple frames (100) are provided. The multiple frames (100) and the base plate (300) together form a receiving cavity. At least one frame (100) is provided with a cavity (1400). The top of the frame (100) is provided with a potting hole (200) communicating with the cavity (1400). Expanding foam is injected into the cavity (1400) through the potting hole (200), so that the expanding foam extends to both ends along the length direction of the frame (100). The radial cross-sectional area of ​​the potting hole (200) is S. The cured expanding foam forms a buffer structure (1300). The length of the buffer structure (1300) is L1. The range is 0.014-3.

15.

2. The battery pack enclosure of claim 1, wherein, The diameter of the glue hole (200) is d, 6mm < d < 20mm, 28mm 2 <S < 315mm 2 .

3. The battery pack enclosure of claim 1, wherein, 100mm < L1 < 2000mm.

4. The battery pack enclosure of claim 1, wherein, The distance between the glue injection hole (200) and the end face of the first end of the frame (100) is L2, and the length of the frame (100) is L3, is in the range of 0.2-0.

8.

5. The battery pack enclosure of claim 1, wherein, The top of the frame (100) is provided with a plurality of glue-filling holes (200), and the plurality of glue-filling holes (200) are spaced apart along the length direction of the frame (100).

6. The battery pack housing according to claim 5, characterized in that, The distance between adjacent potting holes (200) is L4, and L4 ranges from 40cm to 150cm.

7. The battery pack enclosure of claim 5, wherein, The distance between adjacent buffer structures (1300) corresponding to adjacent glue-filling holes (200) is L5, where L5 < 10 cm.

8. The battery pack enclosure of claim 5, wherein, The adjacent buffer structures (1300) corresponding to adjacent potting holes (200) are in contact with each other.

9. The battery pack enclosure of claim 1, wherein, At least one horizontal isolation rib (1500) is provided in the cavity (1400) and is parallel to the base plate (300). The horizontal isolation rib (1500) divides the cavity (1400) into at least two partition cavities (1410). The horizontal isolation rib (1500) is provided with a through hole corresponding to the glue injection hole (200).

10. The battery pack enclosure of claim 1, wherein, At least one vertical isolation rib is provided in the cavity (1400) and is perpendicular to the base plate (300). The vertical isolation rib divides the cavity (1400) into at least two partition cavities (1410). The vertical isolation rib is provided with a through hole connecting the two adjacent partition cavities (1410).

11. The battery pack enclosure of claim 1, wherein, The cavity (1400) is provided with a number of reinforcing ribs, which are connected to the two opposite side walls of the cavity (1400).

12. The battery pack housing according to claim 1, characterized in that, The first end of the cavity (1400) is open and sealed by a sealing structure.

13. The battery pack enclosure of claim 1, wherein, The bottom of the frame (100) is provided with the glue-filling hole (200).

14. The battery pack enclosure of claim 1, wherein, The battery pack housing also includes a beam structure (400), which is mounted on the base plate (300) and divides the accommodating cavity into at least two sub-cavities for installing battery units (500). The beam structure (400) is provided with the cavity (1400), and the top of the beam structure (400) is provided with the glue-filling hole (200) communicating with the cavity (1400). The foaming adhesive is poured into the cavity (1400) through the glue-filling hole (200).

15. The battery pack enclosure of claim 14, wherein, The beam structure (400) includes a horizontal beam (410) and a longitudinal beam (420) arranged perpendicularly to each other. The horizontal beam (410) overlaps the longitudinal beam (420), and the horizontal beam (410) and the longitudinal beam (420) are detachably connected by a connector (600). The horizontal beam (410) and / or the longitudinal beam (420) are provided with the cavity (1400).

16. The battery pack enclosure of claim 15, wherein, The inner side of the frame (100) is provided with a connecting post (900), and the end face of the connecting post (900) is provided with a connecting groove (910). The crossbeam (410) is provided with a through hole that passes through both ends along the length direction. The connecting post (900) is inserted into the through hole and is connected to the crossbeam (410) through a third threaded part (1000).

17. The battery pack housing according to claim 16, characterized in that, The distance between the glue-filling hole (200) and the end face of the connecting groove (910) is not less than 10mm.

18. The battery pack enclosure of claim 15, wherein, The end of the longitudinal beam (420) is connected to the frame (100) through a connecting structure (1100). The connecting structure (1100) includes a first connecting piece (1110) and a second connecting piece (1120) that are parallel to each other, and a support piece (1130) that connects the first connecting piece (1110) and the second connecting piece (1120). The first connecting piece (1110) is attached to the longitudinal beam (420) and connected to the longitudinal beam (420) through a fourth threaded component (1200). The second connecting piece (1120) is attached to the frame (100) and connected through a fifth threaded component.

19. The battery pack enclosure of claim 14, wherein, The beam structure (400) includes a sub-beam body (430), both ends of which are connected to the frame (100) to divide the accommodating cavity into at least two sub-cavities. Each sub-cavity is provided with a battery unit (500), and the sub-beam body (430) is provided with the cavity (1400).

20. The battery pack enclosure of claim 14, wherein, The frame (100) is made of metal; and / or the beam structure (400) is made of metal or plastic.

21. The battery pack enclosure of claim 14, wherein, The thickness d1 of the frame (100) is ≥1.5mm.

22. The battery pack enclosure of claim 14, wherein, The thickness d2 of the beam structure (400) is ≥1.5mm.

23. The battery pack enclosure of claim 1, wherein, The density of the buffer structure (1300) is 0.1-0.

5.

24. The battery pack enclosure of claim 1, wherein, The elastic modulus of the buffer structure (1300) is greater than 70 MPa.

25. The battery pack enclosure of claim 1, wherein, The shear strength of the buffer structure (1300) is greater than 1.5 MPa.

26. The battery pack enclosure of claim 1, wherein, The foaming material is either organic or inorganic.

27. A battery pack, characterized by Includes the battery pack housing as described in any one of claims 1-26.

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