Battery pack, protective base for battery pack, box body and vehicle

Abstract

The application discloses a protective base for a battery pack, a battery pack box, a battery pack directly integrated with battery cells and a vehicle. The protective base for the battery pack comprises a main body and a collision-resistant structure. The main body comprises a top plate, a bottom plate and side plates, and the top plate, the bottom plate and the side plates jointly form a first containing space. The collision-resistant structure is arranged in the first containing space, and the collision-resistant structure comprises a plurality of first collision-resistant substructures and a plurality of second collision-resistant substructures which are alternately arranged along a first direction and are connected with each other. The protective base is formed with a plurality of liquid cooling channels which are arranged at intervals along the first direction. The protective base of the application combines the liquid cooling channels with the collision-resistant structure. In the application process, the collision-resistant structure can effectively inhibit the damage of external impact on the battery, and meanwhile, the cooling liquid in the liquid cooling channels can timely absorb the heat generated by the battery pack.

Description

Technical Field

[0001] This invention relates to the field of battery and vehicle component technology, and particularly to a protective base for a battery pack, a battery pack housing, a battery pack with direct cell integration, and a vehicle. Background Technology

[0002] The battery pack is the "heart" of electric engineering vehicles, and its performance directly determines the overall vehicle performance. However, electric engineering vehicles have high-power battery packs that require fast charging, long lifespan, long range, and thermal safety. Furthermore, the complex road conditions they operate in also place demands on the battery pack's impact resistance. Due to the increasing demands for power performance and energy density in engineering vehicle battery packs, in addition to using high-energy-density cells, the industry has primarily opted for a CTP (cell-to-pack) battery pack structure, eliminating the intermediate modules between individual cells and the pack. However, this compact structure makes the battery pack more prone to heat accumulation and increased temperature differences between individual cells, significantly increasing the risk of thermal runaway. This structure also reduces the rigidity and strength of the battery pack due to the lack of supporting modules. Given the complex road conditions in which electric engineering vehicles operate, if the battery pack is impacted by hard objects such as gravel, resulting in compression, dents, damage to individual cell casings, leakage from liquid cooling plates, rupture of cell separators, or short circuits between the positive and negative electrodes, it can cause violent reactions and even fires. Summary of the Invention

[0003] In view of at least some of the problems and deficiencies in the prior art, embodiments of the present invention disclose a protective base for a battery pack, a housing for a battery pack, a battery pack with direct cell integration, and a vehicle.

[0004] On one hand, an embodiment of the present invention provides a protective base for a battery pack, comprising:

[0005] The system comprises a main body and a crash-resistant structure. The main body includes a top plate, a bottom plate, and side plates, which together form a first accommodating space. The crash-resistant structure is disposed within the first accommodating space and includes multiple first crash-resistant substructures and multiple second crash-resistant substructures arranged alternately and interconnected along a first direction. Each first crash-resistant substructure includes N first hollow cell structures, where N is an integer greater than 1. Each second crash-resistant substructure includes N-1 first hollow cell structures and two second hollow cell structures. Each first hollow cell structure and each second hollow cell structure extends along a second direction perpendicular to the first direction. The N first hollow cell structures of the first crash-resistant substructure are sequentially stacked and connected between the top plate and the bottom plate along a third direction perpendicular to the plane defined by the first and second directions. The first of the two second hollow cell structures of the second impact-resistant substructure, the N-1 first hollow cell structures, and the second of the two second hollow cell structures are sequentially stacked and connected between the base plate and the top plate along the third direction. The second of the two second hollow cell structures and the top plate together form a liquid cooling channel extending along the second direction, thereby making the protective base have multiple liquid cooling channels spaced apart along the first direction.

[0006] In some embodiments of the present invention, the protective base further includes: a plurality of connecting pipes connected in series with the plurality of liquid cooling channels to form a liquid cooling pipeline; and two coolant inlets connected to the inlet and outlet of the liquid cooling pipeline, respectively.

[0007] In some embodiments of the present invention, N=4, such that the first impact-resistant substructure includes four first hollow cell structures, and the second impact-resistant substructure includes three first hollow cell structures and two second hollow cell structures.

[0008] In some embodiments of the present invention, the first hollow cell structure includes a first horizontal side, a second horizontal side, a first inclined side, a second inclined side, a third inclined side, and a fourth inclined side. The lengths of the first horizontal side and the second horizontal side are equal, the lengths of the first inclined side and the second inclined side are equal, and the lengths of the third inclined side and the fourth inclined side are equal. The first horizontal side and the second horizontal side are arranged parallel to each other. One end of the first inclined side and one end of the second inclined side are respectively connected to the opposite ends of the first horizontal side. The first inclined side and the second inclined side are inclined in a direction away from the first horizontal side, moving closer to each other. The minimum distance between the first inclined side and the second inclined side is a first distance. One end of the third inclined side and one end of the fourth inclined side are respectively connected to the opposite ends of the second horizontal side. The third inclined side and the fourth inclined side are inclined in a direction away from the second horizontal side, moving closer to each other, and respectively connect to the other ends of the first inclined side and the second inclined side.

[0009] In some embodiments of the present invention, the two second hollow cell structures can be combined together to form a first hollow cell structure.

[0010] In some embodiments of the present invention, in the first direction, the lengths of the first horizontal edge and the second horizontal edge are both 10 mm, and the first distance is 6.25 mm. In the third direction, the height of the first hollow cell structure is 10 mm.

[0011] In some embodiments of the present invention, the thickness of the top plate in the third direction is 1 mm, the thickness of the bottom plate in the third direction is 1 mm, the wall thickness of the first inclined side, the second inclined side, the third inclined side and the fourth inclined side are all 1 mm, and the wall thickness of the first horizontal side and the second horizontal side are both 1 mm.

[0012] On the other hand, an embodiment of the present invention provides a battery pack housing, comprising: a protective base as described in any of the foregoing embodiments; a cover; and a gasket, which is sandwiched between the protective base and the cover and is fixed together with the protective base and the cover to jointly form a second accommodating space.

[0013] In another aspect, an embodiment of the present invention provides a directly integrated battery pack comprising: a plurality of individual battery cells and the aforementioned housing; the plurality of individual battery cells are housed within the second accommodating space of the housing, and each pair of adjacent individual battery cells are electrically connected by a connecting metal sheet, such as a copper sheet.

[0014] In another aspect, an embodiment of the present invention provides a vehicle comprising: a vehicle body and the aforementioned directly integrated battery pack, wherein the directly integrated battery pack is disposed on the vehicle body.

[0015] As can be seen from the above, the technical solutions of the above embodiments of the present invention may have one or more of the following features.

[0016] Beneficial effects:

[0017] 1. The battery pack protective base integrates the liquid cooling channel into the impact-resistant structure. While ensuring that external impacts do not damage the battery pack, coolant is introduced into the liquid cooling channel to absorb the heat generated by the battery pack, so that the battery pack protective base integrates the functions of impact protection and heat dissipation.

[0018] 2. By setting up liquid cooling pipes in the protective base of the battery pack, the thermal management performance of the battery pack directly integrated with the cells can be effectively improved. The liquid cooling channel absorbs the heat generated by the battery pack through circulating coolant or coolant, and carries away the heat to keep the battery operating within a suitable temperature range.

[0019] 3. By incorporating an impact-resistant structure into the protective base of the battery pack, the battery pack is effectively protected from damage caused by foreign objects, such as squeezing, denting, cell casing breakage, liquid cooling plate leakage, cell separator rupture, and short circuits between the positive and negative terminals leading to fire. This improves the safety and reliability of the battery pack. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a three-dimensional structural diagram of a protective base for a battery pack provided in an embodiment of the present invention;

[0022] Figure 2 for Figure 1 A three-dimensional structural diagram of the protective base for the battery pack, shown from another perspective;

[0023] Figure 3 for Figure 2 An enlarged schematic diagram of region A in the diagram;

[0024] Figure 4 for Figure 2 An enlarged schematic diagram of region B in the image;

[0025] Figure 5 for Figure 1A side view of the protective base for the battery pack shown;

[0026] Figure 6 for Figure 5 An enlarged schematic diagram of region C in the diagram;

[0027] Figure 7 for Figure 1 The diagram shows a cross-sectional view of the protective base for the battery pack, parallel to the XZ plane.

[0028] Figure 8 for Figure 7 An enlarged schematic diagram of region D in the diagram;

[0029] Figure 9 A schematic diagram of a single first hollow cell structure;

[0030] Figure 10 for Figure 1 The diagram shown illustrates the structure of the battery pack protective base after the top plate has been removed.

[0031] Figure 11 for Figure 10 An enlarged schematic diagram of region E in the diagram;

[0032] Figure 12 This is an exploded three-dimensional structural diagram of a battery pack housing provided in an embodiment of the present invention;

[0033] Figure 13 for Figure 12 The diagram shows a cross-sectional view of the battery pack housing in the assembled state, parallel to the XZ plane.

[0034] Figure 14 This is a cross-sectional view of a battery pack with directly integrated cells parallel to the XZ plane, provided as an embodiment of the present invention.

[0035] [Explanation of Labels in the Attached Image]

[0036] 11: Protective base; 110: Main body; 1101: Top plate; 1102: Bottom plate; 1103: Side plate; 1104: First accommodating space; 112: Impact-resistant structure; 112a: First impact-resistant substructure; 1120: First hollow cell structure; 11201: First horizontal edge; 11202: Second horizontal edge; 11203: First inclined edge; 11204: Second inclined edge; 11205: Third inclined edge; 11206: Fourth inclined edge; 11 2b: Second impact-resistant substructure; 1122a: Second hollow cell structure; 1122b: Second hollow cell structure; 114: Liquid cooling channel; 115: Liquid cooling pipeline; 116: Connecting pipe; 118a: One of the coolant interfaces; 118b: Another coolant interface; 100: Housing; 13: Gasket; 15: Cover; 101: Second accommodating space; 1000: Battery pack directly integrated with battery cells; 300: Single battery cell; 500: Connecting metal sheet. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0038] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such terms can be used interchangeably where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0039] It should also be noted that the division of multiple embodiments in this invention is only for the convenience of description and should not constitute a special limitation. Features in various embodiments can be combined and referenced in each other without contradiction.

[0040] See Figure 1 and Figure 2The present invention provides a protective base 11 for a battery pack, comprising: a main body 110 and an impact-resistant structure 112. The main body 110 includes a top plate 1101, a bottom plate 1102 and a side plate 1103, which together form a first accommodating space 1104.

[0041] See Figure 7 and Figure 8 As shown, the impact-resistant structure 112 is disposed within the first accommodating space 1104. The impact-resistant structure 112 includes a plurality of first impact-resistant substructures 112a and a plurality of second impact-resistant substructures 112b arranged alternately and interconnected along the X direction. Each first impact-resistant substructure 112a includes N first hollow cell structures 1120, where N is an integer greater than 1. Each second impact-resistant substructure 112b includes N-1 first hollow cell structures 1120 and two second hollow cell structures 1122a and 1122b. Each first hollow cell structure 1120 and each second hollow cell structure 1122a and 1122b extends along the Y direction, which is perpendicular to the X direction. The N first hollow cell structures 1120 of the first impact-resistant substructure 112a extend along the plane defined by the X and Y directions. The second hollow cell structure 1122a, N-1 first hollow cell structures 1120, and second hollow cell structure 1122b of the second impact-resistant substructure 112b are sequentially stacked and connected between the top plate 1101 and the bottom plate 1101 along the third direction Z. The second hollow cell structure 1122b and the top plate 1101 together form a liquid cooling channel 114 extending along the second direction, thus creating multiple liquid cooling channels 114 spaced apart along the X direction on the protective base 11. Figure 5 and Figure 6 As shown.

[0042] More specifically, the impact-resistant structure 112 is located within the first accommodating space 1104 of the main body 110 and is spaced apart from, for example, the edges of the top plate 1101 and bottom plate 1102 of the main body 110. Several mounting holes are provided on the edges of the top plate 1101 that are spaced from the impact-resistant structure 112, for fixing to the battery cover and gasket 13 via positioning pins. The material of the main body 110 has good mechanical strength, corrosion resistance, and thermal conductivity; for example, aluminum alloy has a high strength-to-weight ratio and good thermal conductivity, making it a relatively ideal choice. Although copper alloy has better thermal conductivity, it is relatively heavy. When applied to the impact-resistant structure 112, to simultaneously meet the requirements of lightweighting and heat transfer performance, exemplarily, 6063 high-hardness aluminum alloy, which is actually used in engineering, is selected as the material.

[0043] In some embodiments of the present invention, the impact-resistant structure 112 is, for example, designed as a thin-walled inner hexagonal square tube. The inner hexagonal square tube impact-resistant structure 112 has a unique geometry, which may exhibit a negative Poisson's ratio effect when subjected to external forces. Normally, a structure deforms to some extent when subjected to an impact. For traditional structures with a positive Poisson's ratio, they contract laterally when subjected to longitudinal tension and expand laterally when subjected to longitudinal compression. However, the negative Poisson's ratio effect exhibited by the inner hexagonal square tube impact-resistant structure 112 is the opposite. When this structure is impacted, it is compressed longitudinally but contracts laterally. This unique deformation pattern allows the structure to absorb energy more effectively during a collision.

[0044] Furthermore, the shape of an inner hexagon inherently possesses a certain degree of stability. When subjected to external forces, the edges and corners can support each other, distributing stress. The square tube structure further increases the overall strength and rigidity of the structure, enabling it to withstand greater impact forces.

[0045] Furthermore, the negative Poisson's ratio effect allows the structure to undergo lateral contraction upon impact, thereby increasing the material's density and enhancing its energy absorption capacity. This contraction process converts impact energy into the material's deformation energy, thus reducing the impact on the protected object.

[0046] In traditional battery pack designs, the liquid cooling system piping and impact protection structure are usually separate components, which takes up considerable space. Integrating the liquid cooling piping into the protective base allows for full utilization of the base's internal space, resulting in a more compact overall battery pack layout. When applied to electric engineering vehicles, this integrated design provides more installation space for other components or allows for the installation of larger capacity batteries within the same space, thereby improving the overall system performance.

[0047] In some embodiments of the present invention, see Figure 3 , Figure 4 , Figure 10 and Figure 11 As shown, the protective base 11 includes multiple connecting pipes 116, which are connected in series with multiple liquid cooling channels 114 to form a liquid cooling pipeline 115. In addition, the protective base 11 includes two coolant inlets 118a and 118b, which are respectively connected to the inlet and outlet of the liquid cooling pipeline 115.

[0048] More specifically, each pair of adjacent liquid cooling channels 114 are connected in series by connecting pipes 116, and finally multiple connecting pipes 116 are connected in series to form a liquid cooling pipeline 115. The inlet and outlet of the liquid cooling pipeline 115 are located on opposite sides near the top plate 1101. The liquid cooling pipeline 115 is integrated into the impact-resistant structure 112 and is used for the introduction and recovery of coolant. In some embodiments, the coolant flowing through the liquid cooling pipe 115 directly contacts the top plate 1101, so that the heat generated by the multiple battery cells 300 during operation is dissipated by the liquid cooling pipe 115, allowing the multiple battery cells 300 to be in the normal operating temperature range of 20-30°C. At the same time, the impact-resistant structure 112 is a square tube with an inner hexagonal shape, which has a negative Poisson's ratio effect for impact energy absorption. When the bottom of the vehicle is scraped, impacted, or colliding with a step surface, it can effectively protect the battery cells 300 and prevent fire or explosion caused by thermal runaway of the battery pack 1000 due to damage to the cooling system of the battery cell directly integrated battery pack 1000, thermal runaway of the battery cell, or internal short circuit.

[0049] In some embodiments of the present invention, see Figure 8 As shown, N=4, so that the first impact-resistant substructure 112a includes four first hollow cell structures 1120, and the second impact-resistant substructure 112b includes three first hollow cell structures 1120 and two second hollow cell structures 1122a and 1122b. In this illustrative embodiment, the impact-resistant structure 112, being a four-layer cell structure array, exhibits superior impact resistance performance. Compared to single-layer or fewer-layer cell structure arrays, the four-layer cell structure array provides more energy absorption pathways. When subjected to impact, the cell structures of different layers can deform sequentially, thereby gradually absorbing the impact energy and effectively reducing the degree of damage to the structure from the impact load. Simultaneously, the multi-layer cell structure array increases the overall stability of the structure. Due to the interaction between the cell structures of each layer, the structure can better maintain its shape when subjected to impact, reducing the occurrence of local deformation.

[0050] In some embodiments of the present invention, see Figure 9 As shown, the first hollow cell structure 1120 includes, for example, a first horizontal side 11201, a second horizontal side 11202, a first inclined side 11203, a second inclined side 11204, a third inclined side 11205, and a fourth inclined side 11206. The lengths of the first horizontal side 11201 and the second horizontal side 11202 are equal, the lengths of the first inclined side 11203 and the second inclined side 11204 are equal, and the lengths of the third inclined side 11205 and the fourth inclined side 11206 are equal.

[0051] As described above, the first horizontal side 11201 and the second horizontal side 11202 are arranged parallel to each other. One end of the first inclined side 11203 and one end of the second inclined side 11204 are respectively connected to the opposite ends of the first horizontal side 11201. The first inclined side 11203 and the second inclined side 11204 are inclined in a way that they are close to each other in a direction away from the first horizontal side 11201. The minimum distance between the first inclined side 11203 and the second inclined side 11204 is the first distance D. One end of the third inclined side 11205 and one end of the fourth inclined side 11206 are respectively connected to the opposite ends of the second horizontal side 11202. The third inclined side 11205 and the fourth inclined side 11206 are inclined in a way that they are close to each other in a direction that is away from the second horizontal side 11202, and are respectively connected to the other end of the first inclined side 11203 and the other end of the second inclined side 11204.

[0052] More specifically, the first hollow cell structure 1120 is, for example, an inner hexagon in a two-dimensional plane. The third hypotenuse 11205, the fourth hypotenuse 11206, the second horizontal side 11202, and the top plate 1101 enclose and form the second hollow cell structure 1122b. The first hypotenuse 11203, the second hypotenuse 11204, the first horizontal side 11201, and the bottom plate 1102 enclose and form the second hollow cell structure 1122b. In this illustrative embodiment, the concave hexagonal structure has been shown to possess very unique mechanical properties and a negative Poisson's ratio effect. When subjected to tensile conditions, the hypotenuse of the concave hexagonal structure changes, causing lateral displacement of the hypotenuse portion, thus producing a negative Poisson's ratio effect.

[0053] In some embodiments of the present invention, see Figure 8 and Figure 9 As shown, two second hollow cell structures 1122a and 1122b can be combined to form a first hollow cell structure 1120. More specifically, the two second hollow cell structures are, for example, isosceles trapezoids in a two-dimensional plane. Connecting the second hollow cell structures 1122b, i.e., connecting the first hypotenuse 11203 and the third hypotenuse 11205, and connecting the second hypotenuse 11204 and the fourth hypotenuse 11206, can combine them into a complete first hollow cell structure 1120.

[0054] In this embodiment, by rationally designing the combination of the second hollow cell structure and the first hollow cell structure, the peak impact force can be reduced. When impacted, the second and first hollow cell structures can mitigate the transmission of impact force through deformation and energy absorption, thereby reducing the peak impact force. Simultaneously, the combination can delay the occurrence of the peak impact force. During the collision, the deformation and energy absorption processes of the second and first hollow cell structures require a certain amount of time, which delays the occurrence of the peak impact force, thus providing more protection time for the impacted object. Secondly, the combination of the second and first hollow cell structures can improve the stability of the impact-resistant structure 112. By rationally combining the second and first hollow cell structures, the structure can maintain a more stable shape during collisions, reducing structural collapse and damage. In the case of repeated collisions, the combination can reduce fatigue damage to the structure and extend its service life.

[0055] In some embodiments of the present invention, see Figure 7 and Figure 9 As shown, in the X direction, the lengths of the first horizontal side 11201 and the second horizontal side 11202 are both 10 mm, for example, and the first distance D is, for example, 6.25 mm; and in the Z direction, the height H of the first hollow cell structure 1120 is, for example, 10 mm.

[0056] As mentioned above, this structural parameter configuration offers superior energy absorption compared to other configurations. When the structural parameters are in specific combinations, the cellular structure may form unique mechanical structures, providing more energy absorption pathways. For example, the structure may undergo specific deformation modes upon impact, such as bending, compression, and torsion. These deformation modes effectively convert impact energy into structural deformation energy, thus achieving energy absorption. Appropriate side length ratios and heights allow the structure to maintain good shape and mechanical properties under stress, preventing structural failure due to excessive deformation. Improved stability helps ensure the reliability and continuity of the energy absorption process, thereby enhancing the overall impact resistance of the structure. Furthermore, while ensuring good energy absorption, appropriate structural parameters can reduce material usage and weight; suitable side lengths and heights reduce material consumption, thus lowering costs. Simultaneously, a lighter structure also contributes to improved energy efficiency and performance of the entire system.

[0057] In some embodiments of the present invention, see Figure 8 and Figure 9As shown, the thickness of the top plate 1101 in the Z direction is, for example, 1 mm, the thickness of the bottom plate 1102 in the Z direction is, for example, 1 mm, the wall thickness of the first inclined side 11203, the second inclined side 11204, the third inclined side 11205 and the fourth inclined side 11206 is, for example, 1 mm, and the wall thickness of the first horizontal side 11201 and the second horizontal side 11202 is, for example, 1 mm.

[0058] More specifically, when performing simulation calculations, the cell structure model does not include wall thickness (i.e., a sheet without thickness). The wall thickness is set in the software. For example, a wall thickness of 1mm means that the shared edge between a single cell structure and adjacent cell structures is thickened inward by 0.5mm. Thus, the wall thickness of the impact-resistant structure 112 is a uniform 1mm.

[0059] In some embodiments, the wall thickness needs to be reduced as much as possible while meeting the impact resistance requirements to reduce thermal conductivity and improve heat dissipation. Under the same structural parameter ratio, increasing the wall thickness t of the impact-resistant structure 112 can enhance the structural rigidity, but the two are not positively linearly correlated. After t exceeds a certain value, a significant boundary effect begins to appear, and the improvement in the overall impact performance of the structure gradually decreases. For example, when t = 1 mm, it can meet the processing requirements and make the overall structural deformation process more uniform and stable, which is beneficial to enhancing the negative Poisson's ratio effect during structural compression.

[0060] See Figure 12 and Figure 13 As shown, an embodiment of the present invention provides a battery pack housing 100, including: the aforementioned protective base 11; a cover 15; and a gasket 13, which is sandwiched between the protective base 11 and the cover 15 and is fixed together with the protective base 11 and the cover 15 to jointly form a second accommodating space 101.

[0061] More specifically, the gasket 13 and the cover 15 are provided with mounting holes around their perimeter, corresponding to the mounting holes around the top plate 1101. The housing 100 is formed by mounting and fixing the housing 100 by passing positioning pins sequentially through the mounting holes of the cover 15, gasket 13, and protective base from top to bottom. The second accommodating space 101 within this housing is used to hold multiple individual battery cells 300. In some embodiments, when the housing 100 is impacted, the gasket 13 can absorb the impact energy through its own deformation. This energy absorption capability can effectively reduce the impact force transmitted to the individual battery cells 300, reducing the risk of damage to the individual battery cells 300.

[0062] See Figure 14As shown, an embodiment of the present invention provides a direct-integration battery pack 1000, comprising: a plurality of individual battery cells 300 and the aforementioned housing 100; the plurality of individual battery cells 300 are housed in a second housing space 101 of the housing 100, and each pair of adjacent individual battery cells 300 are electrically connected by a connecting metal sheet 500, such as a copper sheet.

[0063] More specifically, the battery pack is directly composed of multiple individual battery cells 300, thereby reducing the waste of internal space in the battery pack caused by supporting structures, etc. For example, the individual battery cells 300 are made of materials such as lithium-ion, nickel-metal hydride, or lead-acid, and are used to store and release electrical energy.

[0064] In addition, an embodiment of the present invention provides a vehicle, for example including: a vehicle body and the aforementioned cell-integrated battery pack 1000; the cell-integrated battery pack 1000 is disposed on the vehicle body.

[0065] In summary, this embodiment of the invention integrates the liquid cooling pipe 115 into the crash-resistant structure 112, which can greatly optimize the internal space layout of the battery pack. In electric vehicle applications, it can reduce the space occupied by the liquid cooling pipe alone in the traditional layout, providing more installation space for the battery and other key components; it helps to improve the energy density of the battery pack, enabling the vehicle to carry more battery capacity in the same volume, thereby increasing the driving range. Because the liquid cooling pipe 115 is closer to the battery, it can more quickly absorb and carry away the heat generated by the individual battery cells 300 during charging and discharging, which helps to improve thermal management efficiency. At the same time, integrating the liquid cooling pipe 115 into the crash-resistant structure 112 can further enhance the crash resistance of the overall structure. In the event of a collision, the crash-resistant structure 112 can provide additional protection for the liquid cooling pipe 115, reducing the risk of pipe rupture and leakage.

[0066] It is worth mentioning that the geometry of the impact-resistant structure 112 is relatively complex. For cases with strict dimensional requirements, its fabrication process can adopt 3D printing technology. By selecting a suitable printing method and printing equipment, such as powder bed welding (PBF) or direct energy deposition (DED), the process parameters of printing can be controlled during the fabrication process to ensure the processing accuracy and quality of the finished product. In addition, the high degree of automation in manufacturing improves material utilization efficiency and reduces manufacturing difficulty and cost.

[0067] It is understood that the foregoing embodiments are merely illustrative examples of the present invention. Provided that the technical features do not conflict, the structure is not contradictory, and the purpose of the invention is not violated, the technical solutions of the various embodiments can be arbitrarily combined and used.

[0068] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A protective base for a battery pack, characterized in that, include: The main body and the impact-resistant structure, the main body including a top plate, a bottom plate and side plates, the top plate, the bottom plate and the side plates together forming a first accommodating space; The impact-resistant structure is disposed within the first accommodating space, and the impact-resistant structure includes a plurality of first impact-resistant substructures and a plurality of second impact-resistant substructures that are alternately arranged and interconnected along a first direction; Each of the first impact-resistant substructures includes N first hollow cell structures, where N is an integer greater than 1. Each of the second impact-resistant substructures includes N-1 first hollow cell structures and two second hollow cell structures. Each of the first hollow cell structures and each of the second hollow cell structures extends along a second direction perpendicular to the first direction. The N first hollow cell structures of the first impact-resistant substructure are sequentially stacked and connected between the top plate and the bottom plate along a third direction perpendicular to the plane defined by the first and second directions. The first of the two second hollow cell structures of the second impact-resistant substructure, the N-1 first hollow cell structures, and the second of the two second hollow cell structures are sequentially stacked and connected between the bottom plate and the top plate along the third direction. The second of the two second hollow cell structures and the top plate together form a liquid cooling channel extending along the second direction, thereby forming a plurality of liquid cooling channels spaced apart along the first direction.

2. The protective base according to claim 1, characterized in that, Also includes: Multiple connecting pipes are connected in series with the multiple liquid cooling channels to form a liquid cooling pipeline; as well as Two coolant inlets are connected to the inlet and outlet of the liquid cooling pipeline, respectively.

3. The protective base according to claim 1, characterized in that, N=4, such that the first impact-resistant substructure includes four first hollow cell structures, and the second impact-resistant substructure includes three first hollow cell structures and two second hollow cell structures.

4. The protective base according to claim 3, characterized in that, The first hollow cell structure includes a first horizontal side, a second horizontal side, a first oblique side, a second oblique side, a third oblique side, and a fourth oblique side. The lengths of the first horizontal side and the second horizontal side are equal, the lengths of the first oblique side and the second oblique side are equal, and the lengths of the third oblique side and the fourth oblique side are equal. The first horizontal side and the second horizontal side are arranged parallel to each other. One end of the first inclined side and one end of the second inclined side are respectively connected to the opposite ends of the first horizontal side. The first inclined side and the second inclined side are inclined in a way that they are close to each other in a direction away from the first horizontal side. The minimum distance between the first inclined side and the second inclined side is the first distance. One end of the third inclined side and one end of the fourth inclined side are respectively connected to the opposite ends of the second horizontal side. The third inclined side and the fourth inclined side are inclined in a way that they are close to each other in a direction away from the second horizontal side and are respectively connected to the other end of the first inclined side and the other end of the second inclined side.

5. The protective base according to claim 4, characterized in that, The two second hollow cell structures can be combined together to form a first hollow cell structure.

6. The protective base according to claim 4, characterized in that, In the first direction, the lengths of the first horizontal edge and the second horizontal edge are both 10 mm, and the first distance is 6.25 mm; and in the third direction, the height of the first hollow cell structure is 10 mm.

7. The protective base according to claim 5, characterized in that, The thickness of the top plate in the third direction is 1 mm, the thickness of the bottom plate in the third direction is 1 mm, the wall thickness of the first inclined side, the second inclined side, the third inclined side and the fourth inclined side are all 1 mm, and the wall thickness of the first horizontal side and the second horizontal side are both 1 mm.

8. A battery pack housing, characterized in that, include: The protective base according to any one of claims 1 to 7; Cover; as well as A gasket is sandwiched between the protective base and the cover, and is fixed together with the protective base and the cover to form a second accommodating space.

9. A battery pack with directly integrated battery cells, characterized in that, include: Multiple individual battery cells and the housing according to claim 8; The plurality of battery cells are housed in the second accommodating space of the housing, and each pair of adjacent battery cells are electrically connected by a connecting metal sheet.

10. A vehicle, characterized in that, include: The vehicle body and the cell-integrated battery pack according to claim 9, wherein the cell-integrated battery pack is disposed on the vehicle body.

Images