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

Abstract

The embodiment of the invention discloses a protective base for a battery pack, a battery pack box body, a battery cell directly integrated battery pack and a vehicle, the protective base for the battery pack comprises a main body and an anti-collision 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 define a first accommodating space; the anti-collision structure is arranged in the first containing space and comprises a plurality of first anti-collision substructures and a plurality of second anti-collision substructures which are alternately arranged in the first direction and connected with one another. A plurality of liquid cooling channels which are arranged at intervals in the first direction are formed in the protective base. According to the protective base disclosed by the embodiment of the invention, the liquid cooling channel and the collision-resistant structure are combined, in the application process, the collision-resistant structure can effectively inhibit damage of external collision to the battery, and meanwhile, the cooling liquid is introduced into the liquid cooling channel so that heat generated by the battery pack can be absorbed in time.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries and vehicle parts, and in particular to a protective base for a battery pack, a battery pack box, a battery pack with directly integrated cells, and a vehicle. Background Art

[0002] The battery pack is the "heart" of electric engineering vehicles, and its performance directly determines the performance of the entire vehicle. However, the battery pack of electric engineering vehicles has high power, and requires fast charging, long life, long endurance, and thermal safety during use. In addition, due to the complex road conditions, the impact resistance of the battery pack is also required. Due to the growing demand for power performance and energy density of battery packs for engineering vehicles, in addition to the use of high-energy density batteries, the use of modules that cancel the transition between the battery cell and the battery pack, and directly composed of a large number of battery cells, the CTP (cell to pack) type battery pack structure has become the main choice of the industry. However, the compact space is more likely to cause heat enrichment in the battery pack and increase the temperature difference between the battery cells, and the risk of thermal runaway is significantly increased. This structure also reduces the rigidity and strength of the battery pack due to the lack of module component support. The actual working road conditions of electric engineering vehicles are complex. If the battery pack is squeezed and dented by hard objects such as gravel, the battery cell shell is damaged, the liquid cooling plate leaks, the battery cell diaphragm is ruptured, and the positive and negative electrodes are short-circuited, it will cause violent reactions and even fires. Summary of the invention

[0003] In view of at least some of the problems and shortcomings in the prior art, embodiments of the present invention disclose a protective base for a battery pack, a box for a battery pack, a battery pack directly integrated with battery cells, and a vehicle.

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

[0005] A main body and a crash-resistant structure, wherein the main body includes a top plate, a bottom plate and a side plate, and the top plate, the bottom plate and the side plate together enclose a first accommodating space. The crash-resistant structure is arranged in the first accommodating space, and the crash-resistant structure includes a plurality of first crash-resistant sub-structures and a plurality of second crash-resistant sub-structures that are alternately arranged and interconnected along a first direction. Each of the first crash-resistant sub-structures includes N first hollow cellular structures, wherein N is an integer greater than 1, and each of the second crash-resistant sub-structures includes N-1 first hollow cellular structures and two second hollow cellular structures; each of the first hollow cellular structures and each of the second hollow cellular structures extend along a second direction perpendicular to the first direction. The N first hollow cellular structures of the first crash-resistant sub-structure 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 direction and the second direction. The first of the two second hollow cellular structures of the second impact-resistant sub-structure, the N-1 first hollow cellular structures and the second of the two second hollow cellular structures are sequentially stacked along the third direction and connected between the bottom plate and the top plate, and the second of the two second hollow cellular structures and the top plate together form a liquid cooling channel extending along the second direction, so that the protective base is formed with a plurality of liquid cooling channels arranged at intervals along the first direction.

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

[0007] In some embodiments of the present invention, N=4, so that the first impact-resistant substructure includes four first hollow cellular structures, and the second impact-resistant substructure includes three first hollow cellular structures and two second hollow cellular 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 hypotenuse, a second hypotenuse, a third hypotenuse, and a fourth hypotenuse. The lengths of the first horizontal side and the second horizontal side are equal, the lengths of the first hypotenuse and the second hypotenuse are equal, and the lengths of the third hypotenuse and the fourth hypotenuse are equal. The first horizontal side and the second horizontal side are arranged in parallel with each other, one end of the first hypotenuse and one end of the second hypotenuse are respectively connected to the opposite ends of the first horizontal side, the first hypotenuse and the second hypotenuse are inclined in a direction away from the first horizontal side in a manner close to each other, and the minimum distance between the first hypotenuse and the second hypotenuse is the first distance. One end of the third hypotenuse and one end of the fourth hypotenuse are respectively connected to the opposite ends of the second horizontal side, the third hypotenuse and the fourth hypotenuse are inclined in a direction away from the second horizontal side in a manner close to each other, and are respectively connected to the other end of the first hypotenuse and the other end of the second hypotenuse.

[0009] In some embodiments of the present invention, the two second hollow cellular structures can be assembled together to form one first hollow cellular structure.

[0010] In some embodiments of the present invention, in the first direction, the lengths of the first horizontal side and the second horizontal side 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 hypotenuse, the second hypotenuse, the third hypotenuse and the fourth hypotenuse are all 1 mm, and the wall thickness of the first horizontal edge and the second horizontal edge are both 1 mm.

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

[0013] On the other hand, an embodiment of the present invention provides a battery pack with directly integrated battery cells, comprising: a plurality of battery cell units and the aforementioned box body; the plurality of battery cell units are accommodated in the second accommodation space of the box body, and each adjacent two battery cell units are electrically connected by connecting metal sheets such as copper sheets.

[0014] On the other hand, an embodiment of the present invention provides a vehicle, comprising: a vehicle body and the aforementioned battery pack directly integrated with battery cells, wherein the battery pack directly integrated with battery cells is arranged on the vehicle body.

[0015] It can be seen from the above that the technical solutions of the above embodiments of the present invention may have one or more of the following:

[0016] Beneficial effects:

[0017] 1. The protective base for the battery pack integrates the liquid cooling channel into the collision-resistant structure. While effectively preventing the battery pack from being damaged by external impact, coolant is passed into the liquid cooling channel to absorb the heat generated by the battery pack, so that the protective base for the battery pack integrates the anti-collision and heat dissipation functions into one.

[0018] 2. The thermal management performance of the battery pack directly integrated with the battery cells can be effectively improved by setting up liquid cooling pipelines in the protective base for the battery pack. The liquid cooling channel absorbs the heat generated by the battery pack by circulating coolant or cooling liquid, and takes the heat away to keep the battery running within an appropriate temperature range.

[0019] 3. By setting up a collision-resistant structure in the protective base for the battery pack, the battery pack can be effectively prevented from being squeezed, dented, damaged, leaked, ruptured, and short-circuited by positive and negative electrodes, resulting in fire, etc. after being hit by foreign objects, thereby improving the safety and reliability of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

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

[0022] Figure 2 for Figure 1 A schematic diagram of the three-dimensional structure of the protective base for the battery pack shown in another perspective;

[0023] Figure 3 for Figure 2 An enlarged schematic diagram of region A in FIG.

[0024] Figure 4 for Figure 2 An enlarged schematic diagram of region B in FIG.

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

[0026] Figure 6 for Figure 5 An enlarged schematic diagram of region C in FIG.

[0027] Figure 7 for Figure 1 The schematic cross-sectional view of the structure of the protective base for the battery pack shown is parallel to the XZ plane;

[0028] Figure 8 for Figure 7 An enlarged schematic diagram of region D in FIG.

[0029] Fig. 9 is a schematic structural diagram of a single first hollow cell structure;

[0030] Fig.10 for Figure 1 The schematic diagram of the structure of the protective base for the battery pack shown in the figure after removing the top plate;

[0031] Fig.11 for Fig.10 An enlarged schematic diagram of region E in FIG.

[0032] Fig.12 A schematic exploded view of a three-dimensional structure of a box for a battery pack provided in an embodiment of the present invention;

[0033] Fig.13 for Fig.12 The schematic structural cross-sectional view of the battery pack box parallel to the XZ plane when it is in an assembled state;

[0034] Fig.14 A schematic cross-sectional view of the structure of a battery pack directly integrated with battery cells parallel to the XZ plane provided in an embodiment of the present invention.

[0035] [Description of Reference Numerals]

[0036] 11: protective base; 110: main body; 1101: top plate; 1102: bottom plate; 1103: side plate; 1104: first accommodation space; 112: anti-collision structure; 112a: first anti-collision substructure; 1120: first hollow cell structure; 11201: first horizontal edge; 11202: second horizontal edge; 11203: first oblique edge; 11204: second oblique edge; 11205: third oblique edge; 11206: fourth oblique edge; 11 2b: second anti-collision 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 cooling liquid interfaces; 118b: the second cooling liquid interface; 100: box body; 13: gasket; 15: cover body; 101: second accommodating space; 1000: battery cell directly integrated into battery pack; 300: battery cell monomer; 500: connecting metal sheet. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the specific embodiments of the present invention and the corresponding drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0038] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchangeable where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

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

[0040] See also Figure 1 and Figure 2A protective base 11 for a battery pack provided in an embodiment of the present invention includes: a main body 110 and a collision-resistant structure 112, the main body 110 includes a top plate 1101, a bottom plate 1102 and a side plate 1103, and the top plate 1101, the bottom plate 1102 and the side plate 1103 together form a first accommodating space 1104.

[0041] See also Figure 7 and Figure 8 As shown, the crash-resistant structure 112 is disposed in the first accommodating space 1104, and the crash-resistant structure 112 includes a plurality of first crash-resistant substructures 112a and a plurality of second crash-resistant substructures 112b that are alternately arranged and interconnected along the X direction. Each first crash-resistant substructure 112a includes N first hollow cellular structures 1120, wherein N is an integer greater than 1, and each second crash-resistant substructure 112b includes N-1 first hollow cellular structures 1120 and two second hollow cellular structures 1122a, 1122b; each first hollow cellular structure 1120 and each second hollow cellular structure 1122a, 1122b extend along the Y direction that is perpendicular to the X direction; the N first hollow cellular structures 1120 of the first crash-resistant substructure 112a extend along the plane defined by the X direction and the Y direction. The second hollow cellular structure 1122a of the second anti-collision substructure 112b, N-1 first hollow cellular structures 1120 and the second hollow cellular structure 1122b are sequentially stacked and connected between the bottom plate 1102 and the top plate 1101 along the third direction Z, and the second hollow cellular structure 1122b and the top plate 1101 jointly form a liquid cooling channel 114 extending along the second direction, so that the protective base 11 is formed with a plurality of liquid cooling channels 114 arranged at intervals along the X direction, such as Figure 5 and Figure 6 shown.

[0042] More specifically, the crash-resistant structure 112 is in the first accommodation space 1104 of the main body 110 and is, for example, spaced a distance from the edges of the top plate 1101 and the bottom plate 1102 of the main body 110. A number of mounting holes are provided on the edges of the top plate 1101 spaced from the crash-resistant structure 112, which are used to fix the battery cover and the gasket 13 through positioning pins. The material of the main body 110 has, for example, good mechanical strength, corrosion resistance and thermal conductivity; for example, aluminum alloy has a high strength-to-weight ratio and good thermal conductivity, and is an ideal choice. Although copper alloy has better thermal conductivity, it is relatively heavy. When applied to the crash-resistant structure 112, in order to meet the lightweight requirements and heat transfer performance at the same time, illustratively, the material is selected from the 6063 high-hardness aluminum alloy actually used in engineering.

[0043] In some embodiments of the present invention, the collision-resistant structure 112 is designed with a thin-walled inner hexagonal square tube, for example. The inner hexagonal square tube collision-resistant structure 112 has a unique geometric shape, and this structure may exhibit a negative Poisson's ratio effect when subjected to external force. Normally, a structure will deform to a certain extent when subjected to external force impact. For traditional structures with a positive Poisson's ratio, when subjected to longitudinal stretching, it will shrink laterally; when subjected to longitudinal compression, it will expand laterally. The negative Poisson's ratio effect exhibited by the inner hexagonal square tube collision-resistant structure 112 is the opposite. When the structure is hit, it is compressed longitudinally but shrinks laterally. This unique deformation method enables the structure to absorb energy more effectively during a collision.

[0044] In addition, the inner hexagonal shape itself has a certain stability. When subjected to external forces, the sides and corners can support each other and disperse the stress. The square tube structure 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 shrink laterally during a collision, thereby increasing the density of the material and improving its energy absorption capacity. This shrinkage process can convert the impact energy into deformation energy of the material, thereby reducing the impact on the protected object.

[0046] In traditional battery pack designs, the liquid cooling system pipelines and the crash protection structure are usually set up independently, which takes up a lot of space. Integrating the liquid cooling pipelines into the protection base can make full use of the internal space of the protection base, making the overall layout of the battery pack more compact. When applied to electric engineering vehicles, this integrated design can provide more installation space for other components, or install larger capacity batteries in the same space, thereby improving the performance of the entire system.

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

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

[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 cellular structures 1120, and the second impact-resistant substructure 112b includes three first hollow cellular structures 1120 and two second hollow cellular structures 1122a and 1122b. In this illustrative embodiment, the impact-resistant structure 112 has better impact-resistant performance when it is a 4-layer cellular structure array. Compared with a single-layer or less-layer cellular structure array, a 4-layer cellular structure array can provide more energy absorption pathways. When impacted, the cellular structures of different layers can deform in sequence, thereby gradually absorbing the impact energy, which can effectively reduce the degree of damage to the structure caused by the impact load. At the same time, a multi-layer cellular structure array can increase the overall stability of the structure. Due to the interaction between the cellular 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 Fig. 9 As shown, the first hollow cell structure 1120 includes, for example, a first horizontal side 11201, a second horizontal side 11202, a first oblique side 11203, a second oblique side 11204, a third oblique side 11205, and a fourth oblique side 11206. The lengths of the first horizontal side 11201 and the second horizontal side 11202 are equal, the lengths of the first oblique side 11203 and the second oblique side 11204 are equal, and the lengths of the third oblique side 11205 and the fourth oblique side 11206 are equal.

[0051] Based on the above, the first horizontal side 11201 and the second horizontal side 11202 are arranged parallel to each other, one end of the first hypotenuse 11203 and one end of the second hypotenuse 11204 are respectively connected to the opposite ends of the first horizontal side 11201, the first hypotenuse 11203 and the second hypotenuse 11204 are inclined and arranged in a direction away from the first horizontal side 11201 so as to approach each other, and the minimum distance between the first hypotenuse 11203 and the second hypotenuse 11204 is the first distance D; one end of the third hypotenuse 11205 and one end of the fourth hypotenuse 11206 are respectively connected to the opposite ends of the second horizontal side 11202, the third hypotenuse 11205 and the fourth hypotenuse 11206 are inclined and arranged in a direction away from the second horizontal side 11202 so as to approach each other, and respectively connect the other end of the first hypotenuse 11203 and the other end of the second hypotenuse 11204.

[0052] More specifically, the first hollow cell structure 1120 is, for example, an inner hexagon on a two-dimensional plane, and the third hypotenuse 11205, the fourth hypotenuse 11206, the second horizontal side 11202 and the top plate 1101 are enclosed to form a second hollow cell structure 1122b, and the first hypotenuse 11203, the second hypotenuse 11204, the first horizontal side 11201 and the bottom plate 1102 are enclosed to form a second hollow cell structure 1122b. In this illustrative embodiment, the concave hexagonal structure has been proven to have very unique mechanical properties and negative Poisson's ratio effects. When the concave hexagonal structure is subjected to a tensile condition, the hypotenuse of the structure will change, and at the same time, the hypotenuse part will be displaced laterally, thereby producing a negative Poisson's ratio effect.

[0053] In some embodiments of the present invention, see Figure 8 and Fig. 9 As shown, the two second hollow cellular structures 1122a and 1122b can be assembled together to form a first hollow cellular structure 1120. More specifically, the two second hollow cellular structures are, for example, isosceles trapezoids on a two-dimensional plane, and the second hollow cellular structure 1122b and the second hollow cellular structure 1122b are connected, that is, the first hypotenuse 11203 and the third hypotenuse 11205 are connected, and the second hypotenuse 11204 and the fourth hypotenuse 11206 are connected, and then they can be assembled into a complete first hollow cellular structure 1120.

[0054] In this embodiment, by reasonably designing the combination of the second hollow cell structure and the first hollow cell structure, the peak value of the collision force can be reduced. When impacted, the second hollow cell structure and the first hollow cell structure can slow down the transmission of the collision force through deformation and energy absorption, thereby reducing the peak value of the collision force. At the same time, the combination method can also delay the occurrence time of the peak value of the collision force. During the collision process, the deformation and energy absorption process of the second hollow cell structure and the first hollow cell structure requires a certain amount of time, which can delay the occurrence time of the peak value of the collision force, thereby providing more protection time for the collided object. Secondly, the combination of the second hollow cell structure and the first hollow cell structure can improve the stability of the collision-resistant structure 112. By reasonably combining the second hollow cell structure and the first hollow cell structure, the structure can maintain a more stable shape during the collision process, reducing the collapse and damage of the structure. In the case of repeated collisions, the combination method can reduce fatigue damage to the structure and extend the service life of the structure.

[0055] In some embodiments of the present invention, see Figure 7 and Fig. 9 As shown, in the X direction, the lengths of the first horizontal edge 11201 and the second horizontal edge 11202 are, for example, both 10 mm, 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, the use of this structural parameter can have a better energy absorption effect, which has obvious advantages over other structural parameters. When the structural parameters are in a specific numerical combination, the cell structure may form a specific mechanical structure, thereby providing more energy absorption pathways. For example, the structure may undergo specific deformation modes when impacted, such as bending, compression, twisting, etc. These deformation modes can effectively convert the impact energy into the deformation energy of the structure, thereby achieving energy absorption. Reasonable side length ratio and height can enable the structure to maintain a good shape and mechanical properties during the force process, avoiding structural failure due to excessive deformation. Improved stability helps to ensure the reliability and continuity of the energy absorption process, thereby improving the crashworthiness of the entire structure. In addition, under the premise of ensuring a good energy absorption effect, reasonable structural parameters can reduce the amount and weight of materials used, and appropriate side length and height can reduce material consumption, thereby reducing costs. At the same time, a lighter structure also helps to improve the energy efficiency and performance of the entire system.

[0057] In some embodiments of the present invention, see Figure 8 and Fig. 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 hypotenuse 11203, the second hypotenuse 11204, the third hypotenuse 11205 and the fourth hypotenuse 11206 are, for example, all 1 mm, and the wall thickness of the first horizontal edge 11201 and the second horizontal edge 11202 are, for example, all 1 mm.

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

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

[0060] See also Fig.12 and Fig.13 As shown, a battery pack box 100 provided in an embodiment of the present invention includes: 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 fixed together with the protective base 11 and the cover 15 to jointly enclose a second accommodating space 101.

[0061] More specifically, the gasket 13 and the cover 15 are provided with mounting holes around them, which correspond to the mounting holes around the top plate 1101. The housing 100 is formed by positioning pins through the mounting holes of the cover 15, the gasket 13 and the protective base from top to bottom, and the second accommodating space 101 is used to place multiple battery cells 300. In some embodiments, when the housing 100 is hit, the gasket 13 can absorb the impact energy by its own deformation. This energy absorption capacity can effectively reduce the impact force transmitted to the battery cell 300 and reduce the risk of damage to the battery cell 300.

[0062] See also Fig.14As shown, a battery pack 1000 with directly integrated battery cells provided in an embodiment of the present invention includes: a plurality of battery cell units 300 and the aforementioned box body 100; the plurality of battery cell units 300 are accommodated in the second accommodation space 101 of the box body 100, and each two adjacent battery cell units 300 are electrically connected by connecting metal sheets 500, such as copper sheets.

[0063] More specifically, a battery pack is directly composed of a plurality of battery cells 300, thereby reducing the waste of internal space of the battery pack by support structures, etc. Exemplarily, the 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, a vehicle provided by an embodiment of the present invention, for example, includes: a vehicle body and the aforementioned battery pack 1000 directly integrated with battery cells; the battery pack 1000 directly integrated with battery cells is arranged on the vehicle body.

[0065] In summary, the embodiment of the present invention integrates the liquid cooling line 115 into the crash-resistant structure 112, which can greatly optimize the internal space layout of the battery pack. In electric vehicle applications, the space occupied by the liquid cooling line alone in the traditional layout can be reduced, providing more installation space for other key components such as batteries; it helps to improve the energy density of the battery pack, so that the vehicle can carry more battery capacity in the same volume, thereby increasing the cruising range. Since the liquid cooling line 115 is closer to the battery, it can absorb the heat generated by the battery cell 300 during the charging and discharging process more quickly and take it away, which helps to improve the thermal management efficiency. At the same time, integrating the liquid cooling line 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 line 115 and reduce the risk of line rupture and leakage.

[0066] It is worth mentioning that the geometric shape of the crash-resistant structure 112 is relatively complex. For situations with strict dimensional requirements, its preparation process can adopt 3D printing technology by selecting suitable printing methods and printing equipment, for example, powder bed fusion (PBF), direct energy deposition (DED) and other methods can be selected; controlling the printing process parameters during the preparation process can ensure the processing accuracy and quality of the finished product. In addition, the high degree of manufacturing automation improves the material utilization efficiency and can reduce the manufacturing difficulty and cost.

[0067] It can be understood that the aforementioned embodiments are merely exemplary descriptions of the present invention. The technical solutions of the various embodiments can be arbitrarily combined and used in combination, provided that the technical features do not conflict, the structures do not contradict, and the purpose of the present invention is not violated.

[0068] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions 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: A main body and a crash-resistant structure, wherein the main body comprises a top plate, a bottom plate and side plates, and the top plate, the bottom plate and the side plates together enclose a first accommodating space; The crash-resistant structure is disposed in the first accommodating space, and includes a plurality of first crash-resistant sub-structures and a plurality of second crash-resistant sub-structures that are alternately arranged and interconnected along a first direction; Each of the first impact-resistant substructures includes N first hollow cellular structures, wherein N is an integer greater than 1, and each of the second impact-resistant substructures includes N-1 first hollow cellular structures and two second hollow cellular structures; each of the first hollow cellular structures and each of the second hollow cellular structures extend along a second direction perpendicular to the first direction; the N first hollow cellular 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 direction and the second direction; the first of the two second hollow cellular structures of the second impact-resistant substructure, the N-1 first hollow cellular structures and the second of the two second hollow cellular structures are sequentially stacked and connected between the bottom plate and the top plate along the third direction, and the second of the two second hollow cellular structures and the top plate together form a liquid cooling channel extending along the second direction, so that the protective base is formed with a plurality of liquid cooling channels arranged at intervals along the first direction.

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

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

4. The protective base according to claim 3, characterized in that: The first hollow cell structure comprises a first horizontal side, a second horizontal side, a first hypotenuse, a second hypotenuse, a third hypotenuse, and a fourth hypotenuse, the first horizontal side and the second horizontal side are of equal length, the first hypotenuse and the second hypotenuse are of equal length, and the third hypotenuse and the fourth hypotenuse are of equal length; The first horizontal side and the second horizontal side are arranged parallel to each other, one end of the first hypotenuse and one end of the second hypotenuse are respectively connected to the opposite ends of the first horizontal side, the first hypotenuse and the second hypotenuse are inclined in a direction away from the first horizontal side so as to approach each other, and the minimum distance between the first hypotenuse and the second hypotenuse is a first distance; one end of the third hypotenuse and one end of the fourth hypotenuse are respectively connected to the opposite ends of the second horizontal side, the third hypotenuse and the fourth hypotenuse are inclined in a direction away from the second horizontal side so as to approach each other and respectively connect the other end of the first hypotenuse and the other end of the second hypotenuse.

5. The protective base according to claim 4, characterized in that: The two second hollow cellular structures can be assembled together to form one first hollow cellular structure.

6. The protective base according to claim 4, characterized in that: In the first direction, the lengths of the first horizontal side and the second horizontal side 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 hypotenuse, the second hypotenuse, the third hypotenuse and the fourth hypotenuse are all 1 mm, and the wall thickness of the first horizontal edge and the second horizontal edge are both 1 mm.

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

9. A battery pack directly integrated with battery cells, characterized in that: include: A plurality of battery cells and a box according to claim 8; The plurality of battery cells are accommodated in the second accommodation space of the box body, and each two adjacent battery cells are electrically connected via a connecting metal sheet.

10. A vehicle, characterized in that: include: A vehicle body and a battery pack with directly integrated battery cells according to claim 9, wherein the battery pack with directly integrated battery cells is arranged on the vehicle body.

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