Battery pack buffer structure

Abstract

The utility model relates to a battery pack buffer structure which comprises a shell, a plurality of partition plate groups and a plurality of hollow particle groups, a plurality of hollow particles are arranged in each hollow particle group, and the wall thicknesses of the hollow particles of two adjacent buffer cavities are different. When the battery pack is used, a plurality of buffer structures can be arranged on the periphery of the shell of the battery pack, when the buffer structures are impacted, the shell deforms and is sunken inwards to extrude the hollow particles in the plurality of buffer cavities, and the hollow particles are stressed to deform and transmit impact force inwards at the same time; the impact force is gradually reduced under the transmission of the hollow particles of the plurality of buffer cavities so as to fully absorb the influence of external impact or impact on the shell of the battery pack, the buffer structure can absorb the impact force on the periphery of the battery pack, the structure of the battery pack does not need to be improved, and the distribution planning of the batteries in the battery pack is not influenced, so that the service life of the battery pack is prolonged. Buffering performance is good and utilization rate is high.

Description

Technical Field

[0001] The utility model relates to the field of batteries, and in particular to a battery pack buffer structure. Background Art

[0002] Compared to traditional fuel-powered vehicles, pure electric vehicles (BEVs) are widely favored by consumers due to their high efficiency, low noise, fast acceleration, low travel costs, and zero tailpipe emissions. As the number of BEVs increases, their safety is becoming a key concern. When operating in complex conditions, the battery pack, a core component of an electric vehicle, can be impacted by sharp objects on the road, squeezing and deforming the individual cells within. In severe cases, this can lead to fires, explosions, and other accidents.

[0003] In recent years, exploratory research has focused on the collision safety of power battery packs and electric vehicles. These studies primarily focus on the deformation of the battery case, battery pack installation location, and internal structure during a collision. In practical applications, these changes may require structural changes, even affecting the volume of the cells within the pack, reducing battery capacity and impacting performance. Utility Model Content

[0004] In view of the above problems, the present invention provides a battery pack buffer structure, which solves the problem that the buffer performance of the existing battery pack needs to be improved from the battery pack structure, which affects the battery pack capacity.

[0005] To achieve the above-mentioned objectives, the present application provides a battery pack buffer structure, including a shell, multiple partition groups and multiple hollow particle groups, the shell including a first bottom plate, a second bottom plate, a first side plate and a second side plate, the first bottom plate and the second bottom plate are arranged opposite to each other, the first side plate and the second side plate are arranged opposite to each other, the first side plate is arranged between the first bottom plate and the second bottom plate, the second side plate is arranged between the first bottom plate and the second bottom plate, the first side plate, the first bottom plate, the second side plate and the second bottom plate are sequentially enclosed to form a storage cavity; multiple partition groups are arranged in the storage cavity, the partition group includes multiple partitions, and the multiple partition groups are distributed in the storage cavity at intervals along the first direction, and the partition group is used to divide the storage cavity into multiple independent buffer cavities; each hollow particle group is filled into a buffer cavity, the hollow particle group includes multiple hollow particles, and the wall thickness of the hollow particles in two adjacent buffer cavities is different.

[0006] In some embodiments, each partition group includes a first partition and a second partition, the first partition is arranged between the first bottom plate and the second bottom plate, and the first partition is arranged at a first angle to the first side plate; the second partition is arranged between the first bottom plate and the second bottom plate, and the second partition is arranged at a second angle to the first side plate; one end of the first partition is connected to one end of the second partition.

[0007] In some embodiments, the end where the first partition plate is connected to the second partition plate is referred to as the first turning flange, and the central axes of the two first turning flanges of the two adjacent partition plate groups are referred to as the first reference axis; the two adjacent partition plate groups are centrally symmetrically distributed along the first reference axis.

[0008] In some embodiments, the buffer cavity includes a first buffer cavity and a second buffer cavity, the first buffer cavity and the second buffer cavity are adjacently arranged, and the shapes of the first buffer cavity and the second buffer cavity are different; the hollow particle group in the first buffer cavity is referred to as the first hollow particle group, the first hollow particle group includes a plurality of first hollow particles, and the first hollow particles have a first wall thickness and a first diameter; the hollow particle group in the second buffer cavity is referred to as the second hollow particle group, the second hollow particle group includes a plurality of second hollow particles, and the second hollow particles have a second wall thickness and a second diameter; the first wall thickness is different from the second wall thickness, and the first diameter is different from the second diameter.

[0009] In some embodiments, filling particles are further included. The filling particles have a third diameter that is smaller than the first diameter and the second diameter. The filling particles are placed in each buffer cavity.

[0010] In some embodiments, the first partition is provided with first connecting holes distributed in a first preset manner, and the first connecting holes are used for allowing filling particles to pass through; and / or, the second partition is provided with second connecting holes distributed in a second preset manner, and the second connecting holes are used for allowing filling particles to pass through.

[0011] In some embodiments, the filler particles have a third wall thickness that is smaller than both the first wall thickness and the second wall thickness.

[0012] In some embodiments, the partition plate group further includes a third partition plate, the thickness of the third partition plate is consistent with the thickness of the first side plate and the second side plate, the third partition plate is parallel to the first side plate and the second side plate, and the third partition plate is arranged in the buffer cavity.

[0013] In some embodiments, the shell and / or partition group are made of sheet metal; the hollow particles are made of one of polystyrene, polyethylene, polypropylene, polyurethane, polyester, aluminum oxide, silicon oxide, zirconium oxide, silicon carbide, boron nitride, aluminum alloy, steel, copper alloy and zinc.

[0014] In some embodiments, the diameter of the hollow particles is one of 10 mm, 12 mm, 14 mm, and 16 mm; the wall thickness of the hollow particles is one of 1 mm, 2 mm, and 3 mm.

[0015] Different from the prior art, in the above technical solution, the battery pack buffer structure includes a shell, multiple partition groups and multiple hollow particle groups, the shell includes a first bottom plate, a second bottom plate, a first side plate and a second side plate, the first bottom plate and the second bottom plate are arranged opposite to each other, the first side plate and the second side plate are arranged opposite to each other, the first side plate is arranged between the first bottom plate and the second bottom plate, the second side plate is arranged between the first bottom plate and the second bottom plate, the first side plate, the first bottom plate, the second side plate and the second bottom plate are sequentially enclosed to form a storage cavity; multiple partition groups are arranged in the storage cavity, the partition group includes multiple partitions, and the multiple partition groups are spaced apart in the storage cavity along the first direction, and the partition group is used to divide the storage cavity into multiple independent buffer cavities; each hollow particle group is filled into a buffer cavity, the hollow particle group includes multiple hollow particles, and the wall thickness of the hollow particles in two adjacent buffer cavities is different. During use, multiple buffer structures can be configured on the periphery of the battery pack shell. When the buffer structure is impacted, the shell is deformed and at the same time, it is concave inward to squeeze the hollow particles in the multiple buffer cavities. The hollow particles are deformed under the force and transmit the impact force inward. The impact force gradually decreases under the transmission of the hollow particles in the multiple buffer cavities to fully absorb the impact of external impact or shock on the battery pack shell. This buffer structure can absorb the impact force on the periphery of the battery pack without the need for structural improvement of the battery pack and will not affect the distribution planning of the batteries in the battery pack. It has good buffering performance and high utilization rate.

[0016] The above-mentioned records related to the content of the utility model are only an overview of the technical solution of the utility model. In order to enable ordinary technicians in this field to more clearly understand the technical solution of the utility model, and then implement it according to the text of the specification and the contents recorded in the drawings, and to make the above-mentioned purposes and other purposes, features and advantages of the utility model easier to understand, the following is an explanation in combination with the specific implementation methods and drawings of the utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings are only used to illustrate the principles, implementation methods, applications, characteristics and effects of the specific embodiments of the present invention and other related contents, and are not to be considered as limiting the present invention.

[0018] In the drawings of the specification:

[0019] Figure 1 is a schematic diagram of the housing described in the specific embodiment;

[0020] Figure 2 This is a first schematic diagram of a specific embodiment in which the shell is filled with hollow particles;

[0021] Figure 3 A second schematic diagram of a shell filled with hollow particles according to a specific embodiment;

[0022] Figure 4 A third schematic diagram of a specific embodiment in which the shell is filled with hollow particles;

[0023] Figure 5 Schematic diagram of different diameters of hollow particles described in a specific embodiment.

[0024] The reference numerals in the above drawings are described as follows:

[0025] 1. Shell;

[0026] 11. First base plate;

[0027] 12. Second base plate;

[0028] 13. First side panel;

[0029] 14. Second side panel;

[0030] 2. Partition group;

[0031] 21. First partition;

[0032] 22. Second partition;

[0033] 23. Third partition;

[0034] 24. Fourth partition;

[0035] 25. Fifth partition;

[0036] 3. The first buffer chamber;

[0037] 4. Second buffer chamber;

[0038] 5. First hollow particles;

[0039] 6. Second hollow particle;

[0040] α, first angle;

[0041] β, the second angle. DETAILED DESCRIPTION

[0042] In order to explain in detail the possible application scenarios, technical principles, specific solutions that can be implemented, and the purpose and effects of the present invention, the following is a detailed description of the specific embodiments listed in conjunction with the accompanying drawings. The embodiments described herein are only used to more clearly illustrate the technical solutions of the present invention and are therefore only examples and are not intended to limit the scope of protection of the present invention.

[0043] References to "embodiments" herein mean that the specific features, structures, or characteristics described in conjunction with the embodiments may be included in at least one embodiment of the present invention. The appearance of the term "embodiment" in various locations in the specification does not necessarily refer to the same embodiment, nor does it specifically limit its independence or relevance to other embodiments. In principle, in the present invention, as long as there are no technical contradictions or conflicts, the various technical features mentioned in the embodiments may be combined in any manner to form a corresponding implementable technical solution.

[0044] Unless otherwise defined, the technical terms used herein have the same meanings as those generally understood by those skilled in the art to which the present invention belongs. The use of relevant terms herein is only for describing specific embodiments and is not intended to limit the present invention.

[0045] In the description of this utility model, the term "and / or" is used to describe a logical relationship between objects, indicating that three relationships can exist. For example, A and / or B means: A exists, B exists, and both A and B exist. In addition, the character " / " in this document generally indicates that the objects before and after are in a logical "or" relationship.

[0046] In the present invention, terms such as "first" and "second" are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship of quantity, priority or sequence between these entities or operations.

[0047] Without further restrictions, in the present invention, the words "include", "comprise", "have" or other similar expressions used in sentences are intended to cover non-exclusive inclusion. These expressions do not exclude the presence of additional elements in the process, method or product including the elements, so that the process, method or product including a series of elements may include not only those limited elements, but also other elements not explicitly listed, or also include elements inherent to such process, method or product.

[0048] Consistent with the understanding in the Examination Guidelines, in this utility model, expressions such as "greater than," "less than," and "exceed" are understood to exclude the number itself; expressions such as "above," "below," and "within" are understood to include the number itself. Furthermore, in the description of the embodiments of this utility model, "multiple" means two or more (including two), and similar expressions related to "multiple," such as "multiple groups" and "multiple times," are also understood in this manner, unless otherwise specifically defined.

[0049] In the description of the embodiments of the present invention, the space-related expressions used, such as "center", "longitudinal", "transverse", "length", "width", "wall thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "vertical", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicate the orientation or position relationship based on the orientation or position relationship shown in the specific embodiments or drawings, and are only for the convenience of describing the specific embodiments of the present invention or facilitating the reader's understanding, and do not indicate or imply that the device or component referred to must have a specific position, a specific orientation, or be constructed or operated in a specific orientation. Therefore, it should not be understood as a limitation on the embodiments of the present invention.

[0050] Unless otherwise expressly specified or limited, in the description of the embodiments of the present invention, the terms "installed", "connected", "connected", "fixed", "set", etc. used should be understood in a broad sense. For example, the "connection" can be a fixed connection, a detachable connection, or an integrated setting; it can be a mechanical connection, an electrical connection, or a communication connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. For those skilled in the technical field of the present invention, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0051] See also Figures 1 to 5 The present embodiment provides a battery pack buffer structure, including a shell 1, multiple partition groups 2 and multiple hollow particle groups, the shell 1 includes a first bottom plate 11, a second bottom plate 12, a first side plate 13 and a second side plate 14, the first bottom plate 11 and the second bottom plate 12 are arranged opposite to each other, the first side plate 13 and the second side plate 14 are arranged opposite to each other, the first side plate 13 is arranged between the first bottom plate 11 and the second bottom plate 12, the second side plate 14 is arranged between the first bottom plate 11 and the second bottom plate 12, the first side plate 13, the first bottom plate 11, the second side plate 14 and the second bottom plate 12 are sequentially enclosed to form a storage cavity; multiple partition groups 2 are arranged in the storage cavity, the partition group 2 includes multiple partitions, and the multiple partition groups 2 are spaced apart along the first direction in the storage cavity, and the partition group 2 is used to divide the storage cavity into multiple independent buffer cavities; each hollow particle group is filled into a corresponding buffer cavity, the hollow particle group includes multiple hollow particles, and the wall thickness of the hollow particles in two adjacent buffer cavities is different.

[0052] In this embodiment, the battery pack buffer structure includes a shell 1, which includes a first side plate 13, a second side plate 14, a first bottom plate 11 and a second bottom plate 12. The shell 1 can be understood as a rectangular structure, wherein the first bottom plate 11 and the second bottom plate 12 are arranged opposite to each other, and the first side plate 13 and the second side plate 14 are arranged opposite to each other. The first side plate 13 is connected to the same side of the first bottom plate 11 and the second bottom plate 12, and the second side plate 14 is connected to the other side of the first bottom plate 11 and the second bottom plate 12, forming a square tube or rectangular tube structure. Then, the internal cavity of the square tube or rectangular tube is also the storage cavity, and the two ends of the square tube or rectangular tube have openings.

[0053] In this structure, the partition plate group 2 is arranged in the storage cavity, wherein the partition plate group 2 placed at the two openings of the shell 1 closes the two openings to ensure the sealing inside the storage cavity and prevent the hollow particles from flowing out. Figure 1 As shown, for example, there are two partition groups 2, so as to form a buffer cavity after closing the two openings; when there are three partition groups 2, two partition groups 2 close the two openings, and another partition group 2 is placed at the center of the storage cavity to divide the storage cavity into two, forming two buffer cavities, and so on.

[0054] In this embodiment, a partition group 2 includes multiple partitions. It should be noted that the partitions in the same partition group 2 have a connection relationship. For example, when the number of partitions is two, one end of the two partitions is connected, the other end of one of the partitions is connected to the first side plate 13, and the other end of the other partition is connected to the second side plate 14, forming a V-shaped or inverted V-shaped structure. For example, when the number of partitions is three, based on the connection of the aforementioned two partitions, the third partition is parallel to the first side plate 13, and one end of the third partition is connected to the current two partitions at one point to form an "individual" structure to further separate the storage cavity. Optionally, a fourth partition and a fifth partition can also be set, and the first partition, the second partition, the fourth partition and the fifth partition are connected in sequence to form a wavy or broken line structure, and then the third partition is set at one of the bends, such as Figure 2 When there are multiple partitions, this embodiment does not limit the connection method and connection structure of the multiple partitions, and different buffer chamber shapes can be split according to actual needs.

[0055] Furthermore, the present embodiment further provides a plurality of hollow particle groups, each hollow particle group is placed in a buffer cavity, and the hollow particle group includes a plurality of hollow particles. Optionally, the stacking forms of the same hollow particle group in the buffer cavity are different, specifically including regular stacking and irregular stacking. Regular stacking is as follows: Figures 2 to 4 As shown, the hollow particles in the same buffer cavity form an obvious layered structure when stacked.

[0056] In this embodiment, the wall thicknesses of the hollow particles in two adjacent buffer cavities are different, that is, the two adjacent buffer cavities have different buffering degrees, and the wall thicknesses of the hollow particles in the two adjacent buffer cavities are configured according to the strength distribution benchmark of the buffering degree. For example, if the buffering degree of the two adjacent buffer cavities changes from weak to strong, then, under the premise that the size and material of the hollow particles are the same, the wall thickness of the hollow particles in the buffer cavity with the weak buffering degree is less than the wall thickness of the hollow particles in the buffer cavity with the strong buffering degree. The thicker the wall, the less deformable capacity, the higher the absorption of the buffering force, and the better impact resistance.

[0057] Optionally, a flexible cloth bag or mesh bag may be added, and the hollow particle assembly may be filled into the flexible cloth bag or mesh bag to complete the assembly of the hollow particle group, which is then placed in the buffer cavity, which facilitates subsequent replacement and maintenance.

[0058] When in use, this embodiment can be configured with multiple buffer structures on the periphery of the battery pack shell. When the buffer structure is impacted, the shell 1 is deformed and at the same time recessed inward to squeeze the hollow particles in the multiple buffer cavities. The hollow particles are deformed under force and transmit the impact force inward. The impact force gradually decreases under the transmission of the hollow particles in the multiple buffer cavities to fully absorb the impact of external impacts or shocks on the battery pack shell. This buffer structure can absorb the impact force on the periphery of the battery pack without the need for structural improvements to the battery pack and will not affect the distribution planning of the batteries in the battery pack. It has good buffering performance and high utilization rate.

[0059] See also Figure 2 In some embodiments, each partition group 2 includes a first partition 21 and a second partition 22. The first partition 21 is arranged between the first bottom plate 11 and the second bottom plate 12, and the first partition 21 and the first side plate 13 are arranged at a first angle α; the second partition 22 is arranged between the first bottom plate 11 and the second bottom plate 12, and the second partition 22 and the first side plate 13 are arranged at a second angle β; one end of the first partition 21 is connected to one end of the second partition 22.

[0060] In this embodiment, the first partition 21 and the first side plate 13 are arranged at a first angle α. Here, it can be understood that the angle between the extended reference line overlapping with the first partition 21 and the first side plate 13 is the first angle α. Here, the first angle α is as follows: Figure 2 Similarly, the angle between the extended reference line overlapping the second partition 22 and the first side plate 13 is a second angle β, as shown Figure 2 When the first angle α is an acute angle, the second angle β is an obtuse angle. When the first angle α is an obtuse angle, the second angle β is an acute angle. The first partition 21 and the second partition 22 can be set according to actual needs.

[0061] The first partition 21 and the second partition 22 are connected to each other. Figure 2 As shown, one side of the first partition 21 is connected to one side of the second partition 22. In some optional embodiments, a fourth partition 24 and a fifth partition 25 are further included. The fourth partition 24 is parallel to the first partition 21, and the fifth partition 25 is parallel to the second partition 22. The fourth partition 24 is connected to the second partition 22, and the fifth partition 25 is connected to the fourth partition 24. The first partition 21, the second partition 22, the fourth partition 24, and the fifth partition 25 are sequentially connected to form a fold line structure. When multiple partition groups 2 are distributed in sequence, the storage cavity is divided into multiple buffer cavities with a fold line structure.

[0062] For further information, see Figure 2 In some embodiments, the end where the first partition plate 21 and the second partition plate 22 are connected is referred to as the first turning flange, and the central axis of the two first turning flanges of two adjacent partition plate groups 2 is referred to as the first reference axis; the two adjacent partition plate groups 2 are centrally symmetrically distributed along the first reference axis. This distribution method makes the structures of the two adjacent buffer chambers different, such as Figure 2 As shown, the structural complexity of multiple buffer cavities in the buffer structure is further improved, the complexity of the buffering degree in different areas of the buffer structure is improved, and different buffering scenarios are adapted.

[0063] In some embodiments, the buffer cavity includes a first buffer cavity 3 and a second buffer cavity 4, the first buffer cavity 3 and the second buffer cavity 4 are adjacently arranged, and the shapes of the first buffer cavity 3 and the second buffer cavity 4 are different; the hollow particle group in the first buffer cavity 3 is recorded as a first hollow particle 5 group, the first hollow particle 5 group includes a plurality of first hollow particles 5, and the first hollow particles 5 have a first wall thickness and a first diameter; the hollow particle group in the second buffer cavity 4 is recorded as a second hollow particle 6 group, the second hollow particle 6 group includes a plurality of second hollow particles 6, and the second hollow particles 6 have a second wall thickness and a second diameter; the first wall thickness is different from the second wall thickness, and the first diameter is different from the second diameter. By adjusting the shape of the first buffer cavity 3 and the second buffer cavity 4, the present embodiment can design different buffer areas according to specific needs to meet specific buffering requirements, and buffer cavities of different shapes can provide different buffering properties, such as energy absorption, dispersion of impact force, etc. At the same time, by setting the first hollow particles 5 and the second hollow particles 6 with different wall thicknesses and diameters, a more precise buffering effect for different types of impacts can be achieved. Hollow particles with different wall thicknesses can provide different degrees of buffering capacity, while hollow particles with different diameters can adapt to impact forces of different sizes; providing more diverse and more precise buffering effects to adapt to different application requirements and impact conditions.

[0064] In some embodiments, filler particles are further included, each having a third diameter that is smaller than both the first and second diameters, and are placed within each buffer cavity. In this embodiment, the filler particles are used to further refine the filling of each buffer cavity. The material of the filler particles can be different from that of the hollow particles being filled. For example, when the hollow particles within the buffer cavity are made of polyurethane, the filler particles can be made of polyester. This allows for a combination of particles of varying hardness and impact resistance within the same buffer cavity, thereby improving the damping resistance of the entire buffer cavity.

[0065] Furthermore, in some embodiments, the first partition 21 is provided with first connecting holes distributed in a first preset manner, and the first connecting holes are used for filling particles to pass through; and / or, the second partition 22 is provided with second connecting holes distributed in a second preset manner, and the second connecting holes are used for filling particles to pass through. The first preset manner and the second preset manner may be the same or different, and the first preset manner and the second preset manner may be set according to actual needs, which is not limited in this embodiment. When in use, the filling particles can serve as a flow medium in the storage cavity. For example, when the first buffer cavity is subjected to a large impact, the filling particles will partially move to the second buffer cavity when the first buffer cavity is under pressure to improve the impact resistance of the second buffer cavity. Similarly, the movement of the filling particles can achieve fine-tuning of the dynamic buffering performance of the entire buffer structure during impact or collision.

[0066] In some embodiments, the filler particles have a third wall thickness that is smaller than both the first and second wall thicknesses. In this embodiment, the filler particles having a third wall thickness also have a hollow structure. The third wall thickness of the filler particles being smaller than both the first and second wall thicknesses allows for a lighter and more flexible structure, improving the flowability of the filler particles within various buffer cavities.

[0067] See also Figure 2 In some embodiments, the baffle assembly 2 further includes a third baffle 23. The thickness of the third baffle 23 is consistent with that of the first side plate 13 and the second side plate 14. The third baffle 23 is parallel to the first side plate 13 and the second side plate 14, and is disposed within the buffer cavity. The third baffle 23 is disposed at the junction of the second baffle 22 and the fourth baffle 24. Optionally, the third baffle 23 may also be disposed at the junction of the first baffle 21 and the second baffle 22, or at the junction of the fourth baffle 24 and the fifth baffle 25. This allows for further separation of the individual buffer cavities, thereby increasing the complexity of the shape and structure of the buffer cavities and adapting to more complex impact scenarios.

[0068] It should be noted that the third partition 23 may not be completely connected to the first partition 21, the second partition 22, the fourth partition 24 and the fifth partition 25, that is, the third partition 23 may not need to completely separate the buffer cavity. In some embodiments, the third partition 23 may also separate the buffer cavity into two independent chambers that are not connected to each other, such as Figure 2 The specific setting location can be set according to actual needs.

[0069] In some embodiments, the shell 1 and / or the partition group 2 are made of sheet metal; the hollow particles are made of one of polystyrene, polyethylene, polypropylene, polyurethane, polyester, aluminum oxide, silicon oxide, zirconium oxide, silicon carbide, boron nitride, aluminum alloy, steel, copper alloy and zinc. It should be noted that the shell 1 shown in this embodiment is made of a material with a negative Poisson's ratio, and the battery pack is formed by bending sheet metal. Based on this idea, the shell 1 is also made of sheet metal. As a preferred embodiment, the material of the partition group 2 is also made of sheet metal. Optionally, the structure of the shell 1 is a rectangular parallelepiped or a cube structure, or it can be an isohedra structure, and the splicing form of multiple partitions in the partition group 2 can be square, triangular, diamond, special-shaped or other structures.

[0070] In certain embodiments, the making material of hollow particles can be divided into polymer materials, ceramic materials and metallic materials according to major categories, and subdivision includes one of polystyrene, polyethylene, polypropylene, polyurethane, polyester, aluminum oxide, silicon oxide, zirconium oxide, silicon carbide, boron nitride, aluminum alloy, steel, copper alloy and zinc. The specific material selection of hollow particles can be set according to actual demand, to achieve different degrees of cushioning effect. As an optional embodiment, the hollow particles of different materials can be placed in the same buffer chamber, to achieve the cushioning effect between the cushioning degree of the hollow particles made of two materials.

[0071] See also Figure 5 In some embodiments, the diameter of the hollow particles is one of 10 mm, 12 mm, 14 mm, and 16 mm; and the wall thickness of the hollow particles is one of 1 mm, 2 mm, and 3 mm. Hollow particles of varying diameters and wall thicknesses can adapt to different buffer cavities and withstand varying impact forces. By properly allocating hollow particles of varying diameters and wall thicknesses, the buffer structure can achieve optimal cushioning performance depending on the application scenario.

[0072] In the above technical solution, the battery pack buffer structure includes a shell 1, multiple partition groups 2 and multiple hollow particle groups. The shell 1 includes a first bottom plate 11, a second bottom plate 12, a first side plate 13 and a second side plate 14. The first bottom plate 11 and the second bottom plate 12 are arranged opposite to each other, and the first side plate 13 and the second side plate 14 are arranged opposite to each other. The first side plate 13 is arranged between the first bottom plate 11 and the second bottom plate 12, and the second side plate 14 is arranged between the first bottom plate 11 and the second bottom plate 12. The first side plate 13, the first bottom plate 11, the second side plate 14 and the second bottom plate 12 are sequentially enclosed to form a storage cavity; multiple partition groups 2 are arranged in the storage cavity, the partition group 2 includes multiple partitions, and the multiple partition groups 2 are spaced apart in the storage cavity along the first direction. The partition group 2 is used to divide the storage cavity into multiple independent buffer cavities; each hollow particle group is filled into a buffer cavity, and the hollow particle group includes multiple hollow particles. The wall thickness of the hollow particles in two adjacent buffer cavities is different. During use, multiple buffer structures can be configured on the periphery of the battery pack shell. When the buffer structure is impacted, the shell 1 is deformed and at the same time recessed inward to squeeze the hollow particles in the multiple buffer cavities. The hollow particles are deformed under force and transmit the impact force inward. The impact force gradually decreases under the transmission of the hollow particles in the multiple buffer cavities to fully absorb the impact of external impacts or shocks on the battery pack shell. This buffer structure can absorb the impact force on the periphery of the battery pack without the need for structural improvements to the battery pack and will not affect the distribution planning of the batteries in the battery pack. It has good buffering performance and high utilization rate.

[0073] Finally, it should be noted that although the above embodiments have been described in the specification and drawings of this utility model, this does not limit the scope of patent protection of this utility model. All technical solutions generated by replacing or modifying equivalent structures or equivalent processes based on the essential concept of this utility model using the contents recorded in the specification and drawings of this utility model, as well as directly or indirectly implementing the technical solutions of the above embodiments in other related technical fields, are included in the scope of patent protection of this utility model.

Claims

1. A battery pack buffer structure, characterized in that: include: The housing includes a first bottom plate, a second bottom plate, a first side plate, and a second side plate, wherein the first bottom plate and the second bottom plate are arranged opposite each other, the first side plate and the second side plate are arranged opposite each other, the first side plate is arranged between the first bottom plate and the second bottom plate, and the second side plate is arranged between the first bottom plate and the second bottom plate, and the first side plate, the first bottom plate, the second side plate, and the second bottom plate are sequentially enclosed to form a storage cavity; a plurality of partition plates arranged in the storage cavity, the partition plates comprising a plurality of partition plates, the plurality of partition plates being spaced apart in the storage cavity along a first direction, the partition plates being used to divide the storage cavity into a plurality of independent buffer cavities; A plurality of hollow particle groups are provided, each of the hollow particle groups is correspondingly filled into one of the buffer cavities, the hollow particle group includes a plurality of hollow particles, and the wall thicknesses of the hollow particles in two adjacent buffer cavities are different.

2. The battery pack buffer structure according to claim 1, characterized in that: Each of the baffle groups comprises: a first partition plate, disposed between the first bottom plate and the second bottom plate, wherein the first partition plate and the first side plate are disposed at a first angle; a second partition plate, disposed between the first bottom plate and the second bottom plate, the second partition plate being disposed at a second angle to the first side plate; One end of the first separator is connected to one end of the second separator.

3. The battery pack buffer structure according to claim 2, characterized in that: The end where the first baffle and the second baffle are connected is referred to as the first turning flange, and the central axes of the two first turning flanges of two adjacent baffle groups are referred to as the first reference axis; Two adjacent partition plate groups are centrally symmetrically distributed along the first reference axis.

4. The battery pack buffer structure according to claim 3, characterized in that: The buffer cavity includes a first buffer cavity and a second buffer cavity, the first buffer cavity and the second buffer cavity are adjacently arranged, and the first buffer cavity and the second buffer cavity have different shapes; The hollow particle group in the first buffer cavity is referred to as a first hollow particle group. The first hollow particle group includes a plurality of first hollow particles. The first hollow particles have a first wall thickness and a first diameter. The hollow particle group in the second buffer cavity is referred to as a second hollow particle group. The second hollow particle group includes a plurality of second hollow particles. The second hollow particles have a second wall thickness and a second diameter. The first wall thickness is different from the second wall thickness, and the first diameter is different from the second diameter.

5. The battery pack buffer structure according to claim 4, characterized in that: Also includes: Filling particles have a third diameter that is smaller than the first diameter and the second diameter. The filling particles are placed in each of the buffer cavities.

6. The battery pack buffer structure according to claim 5, characterized in that: The first separator is provided with first communicating holes distributed in a first preset manner, the first communicating holes being used for the filling particles to pass through; And / or, the second separator is provided with second communicating holes distributed in a second preset manner, and the second communicating holes are used for the filling particles to pass through.

7. The battery pack buffer structure according to claim 6, characterized in that: The filling particles have a third wall thickness, and the third wall thickness is smaller than the first wall thickness and the second wall thickness.

8. The battery pack buffer structure according to claim 3, characterized in that: The separator assembly further comprises: The third partition plate has a thickness consistent with that of the first side plate and the second side plate, is parallel to the first side plate and the second side plate, and is disposed in the buffer cavity.

9. The battery pack buffer structure according to any one of claims 1 to 8, characterized in that: The shell and / or the partition assembly are made of sheet metal; The hollow particles are made of one of polystyrene, polyethylene, polypropylene, polyurethane, polyester, aluminum oxide, silicon oxide, zirconium oxide, silicon carbide, boron nitride, aluminum alloy, steel, copper alloy and zinc.

10. The battery pack buffer structure according to claim 9, characterized in that: The diameter of the hollow particles is one of 10 mm, 12 mm, 14 mm and 16 mm; The wall thickness of the hollow particles is one of 1 mm, 2 mm and 3 mm.

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