A hybrid multi-cell thin-walled structure energy-absorbing tube and battery pack

Abstract

The present invention discloses a hybrid multi-cell thin-walled structure energy-absorbing tube and a battery pack, the energy-absorbing tube comprises: an outer shell, provided with a plurality of outer planes, the connection of the plurality of outer planes all have a collapse groove concave toward the center, the collapse groove has a groove bottom surface and a groove wall surface, and the connection between the groove bottom surface and the groove wall surface forms a first rib; a central structure, which is passed through the outer shell and is concentrically arranged with the outer shell; the central structure has a plurality of second ribs, the number of the second ribs is equal to the number of the first ribs, and the plurality of second ribs correspond to the plurality of first ribs one by one; a plurality of first connecting structures, used to connect the corresponding first ribs and second ribs; a plurality of second connecting structures, the two ends of which are respectively connected to the first connecting structures of adjacent collapse grooves, and the second connecting structure is provided with a plurality of third ribs; a plurality of third connecting structures, which are parallel to the groove wall surface and are used to connect the third ribs and the outer plane. The energy-absorbing tube according to the embodiment of the present invention has good energy absorption effect, simple structure and low manufacturing cost.

Description

Technical Field

[0001] The present invention relates to the technical field of battery manufacturing, and in particular to a mixed multi-cell thin-walled energy-absorbing tube and a battery pack. Background Art

[0002] An automotive battery pack generally includes an outer shell and a battery assembly. The periphery of the battery assembly is connected to the outer shell through multiple energy-absorbing tubes. The energy-absorbing tubes are used to absorb impact energy when the battery pack collides, thereby protecting the battery assembly. Therefore, an energy-absorbing tube with good energy-absorbing effect is needed. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a mixed multi-cell thin-walled energy-absorbing tube, which has low manufacturing cost and good energy-absorbing effect.

[0004] The present invention also provides a battery pack having the above-mentioned mixed multi-cell thin-wall structure energy-absorbing tube.

[0005] The mixed multi-cell thin-walled energy absorbing tube according to the first embodiment of the present invention comprises:

[0006] The outer shell is provided with a plurality of outer planes, and the connection points of the plurality of outer planes are all provided with a collapse groove which is concave toward the center, and the collapse groove has a groove bottom surface and two groove wall surfaces, and the connection point between the groove bottom surface and the groove wall surface forms a first rib;

[0007] A central structure is provided through the outer shell and is concentrically arranged with the outer shell; the central structure has a plurality of second ribs, the number of the second ribs is equal to the number of the first ribs, and the plurality of the second ribs correspond to the plurality of the first ribs one by one;

[0008] A plurality of first connecting structures, used for connecting the corresponding first ribs and the second ribs;

[0009] A plurality of second connection structures, both ends of which are respectively connected to the first connection structures of adjacent collapse grooves, and the second connection structures are provided with a plurality of third ribs;

[0010] A plurality of third connection structures are parallel to the groove wall surface and are used to connect the third edges and the outer plane.

[0011] The mixed multi-cell thin-walled energy-absorbing tube according to the embodiment of the present invention has at least the following beneficial effects:

[0012] By arranging a collapse groove at the connection between adjacent outer surfaces of the outer shell, the energy absorption effect can be improved; the central structure and the outer shell are connected by a first connecting structure, a second connecting structure and a third connecting structure, and the structure is simple and the manufacturing cost is low; the component structures of the mixed multi-cellular thin-walled structure energy-absorbing tube of this embodiment have regular shapes and can be formed by one-time extrusion, thereby reducing processing costs.

[0013] According to some embodiments of the present invention, the outer shell and the central structure are both axisymmetric and central rotationally symmetrical structures.

[0014] According to some embodiments of the present invention, the central structure has a plurality of first surfaces and a plurality of second surfaces, the plurality of first surfaces and the second surfaces are alternately arranged around a circumference, and the second ribs are formed at the connection between the first surfaces and the second surfaces;

[0015] The first surface is parallel to the outer plane, and the second surface is parallel to the groove bottom surface.

[0016] According to some embodiments of the present invention, the first connecting structure includes a thick-walled section and a thin-walled section, the thick-walled section is connected to the central structure, and the thin-walled section is connected to the outer shell; the connection between the thick-walled section and the thin-walled section is connected to the end of the second connecting structure.

[0017] According to some embodiments of the present invention, the second connecting structure is bent in a direction away from the central structure to form a plurality of the third ribs.

[0018] According to some embodiments of the present invention, the second connecting structure is provided with a third surface and a fourth surface, the third surface is parallel to the first surface, the fourth surface is used to connect the third surface and the first connecting structure, and the connection between the third surface and the fourth surface forms the third edge.

[0019] According to some embodiments of the present invention, the distance between the two oppositely arranged outer planes is H, and the thicknesses of the outer shell, the central structure, the first connecting structure, the second connecting structure and the third connecting structure are not greater than 0.05H.

[0020] According to some embodiments of the present invention, the thickness of each position of the outer shell is equal, and the thickness of the outer shell is not greater than the thickness of the central structure, the first connecting structure, the second connecting structure, and the third connecting structure.

[0021] According to some embodiments of the present invention, the mixed multi-cellular thin-walled structure energy-absorbing tube is made of one material.

[0022] According to the second aspect of the present invention, the battery pack includes a shell, a battery assembly and the above-mentioned hybrid multi-cell thin-walled structure energy-absorbing tube, the battery assembly is installed in the shell, and the periphery of the battery assembly is connected to the shell through a plurality of the hybrid multi-cell thin-walled structure energy-absorbing tubes.

[0023] The battery pack according to the embodiment of the present invention comprises the above-mentioned mixed multi-cell thin-wall structure energy-absorbing tube, and therefore at least possesses all the beneficial effects of the mixed multi-cell thin-wall structure energy-absorbing tube; the battery pack of this embodiment has good energy absorption effect, can reduce damage to battery components, and has high safety.

[0024] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0026] Figure 1 It is a schematic structural diagram of a mixed multi-cell thin-walled energy-absorbing tube according to an embodiment of the first aspect of the present invention;

[0027] Figure 2 A schematic cross-sectional diagram of a hybrid multi-cell thin-walled structure energy-absorbing tube according to an embodiment of the first aspect of the present invention;

[0028] Figure 3 A schematic diagram of the cross-sectional dimensions of a mixed multi-cell thin-walled structure energy-absorbing tube according to an embodiment of the first aspect of the present invention;

[0029] Figure 4 It is a schematic cross-sectional view of an existing conventional window-type multi-cellular structure energy-absorbing tube;

[0030] Figure 5 It is a schematic cross-sectional view of an existing bionic tree-like fractal structure energy-absorbing tube;

[0031] Figure 6 This is a schematic structural diagram of a battery pack according to an embodiment of the second aspect of the present invention.

[0032] Figure Number:

[0033] The outer shell 100, the outer plane 110, the collapse groove 120, the groove bottom surface 121, the groove wall surface 122, and the first rib 123;

[0034] Central structure 200, second ribs 210, first surface 220, second surface 230;

[0035] A first connecting structure 300, a thick-walled section 310, and a thin-walled section 320;

[0036] The second connection structure 400, the third surface 410, the fourth surface 420, and the third edge strip 430;

[0037] A third connection structure 500;

[0038] Casing 600 , battery assembly 610 , and mixed multi-cell thin-walled structure energy-absorbing tube 620 . DETAILED DESCRIPTION

[0039] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0040] In the description of the present invention, it should be understood that descriptions involving orientation, such as orientation or positional relationship indicated as up, down, etc., are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0041] In the description of the present invention, "a plurality" means more than two. If there is a description of "first" or "second", it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0042] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0043] Reference Figures 1 to 3 The hybrid multi-cell thin-walled energy absorbing tube 620 of an embodiment of the present invention comprises an outer shell 100, a central structure 200, a first connecting structure 300, a second connecting structure 400 and a third connecting structure 500. The outer shell 100 has a plurality of outer planes 110. The connection of the plurality of outer planes 110 has a collapse groove 120 that is concave toward the center. The collapse groove 120 has a groove bottom surface 121 and two groove walls 122. The connection between the groove bottom surface 121 and the groove wall surface 122 forms a first rib 123, that is, there are two first ribs 123 in one collapse groove 120. The length extension direction of the first rib 123 is parallel to the length extension direction of the outer shell 100. The two first ribs 123 of the same collapse groove 120 are parallel. The outer shell 100 is an axially symmetrical figure and a central rotationally symmetrical figure.

[0044] Furthermore, the central structure 200 passes through the outer shell 100 and is arranged concentrically with the outer shell 100; the central structure 200 is a polygon, so the central structure 200 has a plurality of second ribs 210, the number of the second ribs 210 is equal to the number of the first ribs 123, the plurality of second ribs 210 correspond one-to-one to the plurality of first ribs 123, and the first ribs 123 correspond to the second ribs 210 closest to them; after the plurality of first ribs 123 and the plurality of second ribs 210 are connected one-to-one, there are no intersecting first ribs 123, intersecting second ribs 210, and intersecting first ribs 123 and second ribs 210.

[0045] In an embodiment of the present invention, the first connection structure 300 is used to connect the corresponding first ribs 123 and the second ribs 210. The first connection structure 300 is provided in plurality, and the plurality of first connection structures 300 are respectively used to connect the corresponding first ribs 123 and the second ribs 210. The two ends of the second connection structure 400 are respectively connected to the first connection structure 300 of the adjacent collapse groove 120. The second connection structure 400 is provided with a plurality of third ribs 430. The second connection structure 400 is also provided with a plurality, and the plurality of second connection structures 400 are also rotationally symmetrical about the center. The third connection structure 500 is parallel to the groove wall surface 122, and is used to connect the third ribs 430 and the outer plane 110. The third connection structure 500 is also provided with a plurality. Reference Figure 2 , Figure 3 As shown, the central structure 200 of the hybrid multi-cell thin-walled structure energy-absorbing tube 620 of the present embodiment is an octagon, and therefore has eight second ribs 210; the outer shell 100 is provided with four collapse grooves 120, four outer planes 110, and eight first ribs 123, and the eight first ribs 123 correspond one to one with the eight second ribs 210; accordingly, eight first connecting structures 300 are provided, and the eight first connecting structures 300 are respectively used to connect the eight first ribs 123 and the second ribs 210; four second connecting structures 400 are provided, and the four second connecting structures 400 are respectively used to connect two adjacent first connecting structures 300, and a single second connecting structure 400 is provided with two third ribs 430; eight third connecting structures 500 are provided, and the eight third connecting structures 500 are respectively used to connect the third ribs 430 and the outer plane 110, and each outer plane 110 is connected with two third connecting structures 500. By providing a collapse groove 120 at the connection between adjacent outer surfaces of the outer shell 100, the energy absorption effect can be improved; the central structure 200 and the outer shell 100 are connected by the first connecting structure 300, the second connecting structure 400 and the third connecting structure 500, the structure is simple and the manufacturing cost is low.

[0046] In an embodiment of the present invention, the mixed multi-cellular thin-walled structure energy absorbing tube 620 of this embodiment is made of one material, and preferably a material with good plasticity and certain strength, such as some O-state aluminum alloys. The mixed multi-cellular thin-walled structure energy absorbing tube 620 made of the same material, that is, the outer shell 100, the central structure 200, the first connecting structure 300, the second connecting structure 400 and the third connecting structure 500 are all made of the same material, such a design can effectively reduce production costs; further, since the various component structures of the mixed multi-cellular thin-walled structure energy absorbing tube 620 of this embodiment have regular shapes, they can also be formed by one-time extrusion, thereby improving processing efficiency.

[0047] In the embodiment of the present invention, the central structure 200 is an axisymmetric, central rotation symmetric structure; as can be seen from the above, the outer shell 100 is also an axisymmetric, central rotation symmetric structure; specifically, refer to Figure 2 , Figure 3 As shown, the cross section of the mixed multi-cellular thin-walled structure energy absorbing tube 620 of this embodiment is an axisymmetric and central rotationally symmetrical structure. The mixed multi-cellular thin-walled structure energy absorbing tube 620 designed in this way has better stability and better energy absorption effect.

[0048] In the embodiment of the present invention, the central structure 200 has a plurality of first surfaces 220 and a plurality of second surfaces 230, and the plurality of first surfaces 220 and the second surfaces 230 are alternately arranged around the circumference, and the connection between the first surface 220 and the second surface 230 forms a second rib 210; the first surface 220 is parallel to the outer plane 110, and the second surface 230 is parallel to the groove bottom surface 121. As can be seen from the above, the central structure 200 in this embodiment is an octagon, and therefore has four first surfaces 220 and four second surfaces 230, and the first surface 220 and the second surface 230 are alternately arranged. It should be understood that the sizes of the first surface 220 and the second surface 230 are not necessarily the same. The main difference between the first surface 220 and the second surface 230 is that the widths of the two can be different, but the difference in width between the first surface 220 and the second surface 230 will affect the energy absorption effect, so it is preferred that the first surface 220 and the second surface 230 have the same shape and size.

[0049] In the embodiment of the present invention, the first connection structure 300 includes a thick-walled section 310 and a thin-walled section 320, wherein the thick-walled section 310 is connected to the central structure 200, and the thin-walled section 320 is connected to the outer shell 100; the connection between the thick-walled section 310 and the thin-walled section 320 is connected to the end of the second connection structure 400. Figure 2 , Figure 3As shown, the thick-walled section 310 and the thin-walled section 320 are collinear, and the widths of the thick-walled section 310 and the thin-walled section 320 are substantially the same, that is, the first connecting structure 300 is generally a thick-walled section 310 and half a thin-walled section 320, so that a better energy absorption effect can be obtained.

[0050] In the embodiment of the present invention, the second connection structure 400 is bent in a direction away from the central structure 200 to form a plurality of third ribs 430. Figure 2 , Figure 3 As shown, the second connection structure 400 includes a third surface 410 and two fourth surfaces 420. The two fourth surfaces 420 are respectively connected to the two sides of the third surface 410. The third surface 410 is parallel to the first surface 220. The fourth surface 420 is used to connect the third surface 410 and the first connection structure 300. The connection between the third surface 410 and the fourth surface 420 forms a third rib 430. Since it includes two fourth surfaces 420, the second connection structure 400 has two third ribs 430.

[0051] In an embodiment of the present invention, the spacing between two relatively arranged outer planes 110 is H, and the thickness of the outer shell 100, the central structure 200, the first connecting structure 300, the second connecting structure 400 and the third connecting structure 500 are not greater than 0.05H. As can be seen from the above, the mixed multicellular thin-walled structure energy absorbing tube 620 of this embodiment is mainly formed by extrusion. If the thickness of each component structure of the mixed multicellular thin-walled structure energy absorbing tube 620 is too large, it may lead to problems such as poor extrusion effect or increased extrusion difficulty. At the same time, it will also affect the energy absorption effect of the mixed multicellular thin-walled structure energy absorbing tube 620, because the larger the thickness of each structure, the larger the grain size of the material, the worse the plasticity of the thin wall, which is not conducive to the thin wall plastic deformation energy absorption. Specifically, in order to enable the mixed multicellular thin-walled structure energy absorbing tube 620 to obtain better deformation ability, this embodiment needs to limit some parameters of the mixed multicellular thin-walled structure energy absorbing tube 620, among which, with reference to Figure 2 As shown, Figure 2 , the distance D1 between the first surface 220 of the central structure 200 and the third surface 410 of the second connection structure 400, the distance D2 between the third surface 410 and the outer plane 110 of the outer shell 100, and the width B of the second surface 230 are indicated, wherein:

[0052] 0.15H≤D1≤0.25H, 0.15H≤D2≤0.25H, 0.1H≤B≤0.15H.

[0053] In the embodiment of the present invention, the thickness of each position of the outer shell 100 is equal, and the thickness of the outer shell 100 is not greater than the thickness of the central structure 200, the first connection structure 300, the second connection structure 400, and the third connection structure 500. Specifically, the equal thickness of each position of the outer shell 100 means that the thickness of the outer plane 110, the groove bottom surface 121, and the groove wall surface 122 are all equal, which can facilitate processing; in addition, the relationship between the thickness of the central structure 200, the first connection structure 300, the second connection structure 400, and the third connection structure 500 is as follows:

[0054] Take the maximum wall thickness of the mixed multi-cell thin-walled structure energy absorbing tube 620 as T, and then refer to Figure 2 As shown, the thickness of the outer shell 100 is defined as T1, the thickness of the second connection structure 400 is defined as T2, the thickness of the central structure 200 is defined as T3, the thickness of the third connection structure 500 is defined as T4, the thickness of the thick-walled section 310 of the first connection structure 300 is defined as T5, and the thickness of the thin-walled section 320 of the first connection structure 300 is defined as T6, wherein 0.25T≤T1≤0.5T, 0.8T≤T2≤1T, 0.8T≤T3≤1T, 0.5T≤T4≤0.8T, 0.7T≤T5≤0.9T, 0.5T≤T6≤0.8T; wherein preferably, T6=T4, that is, the thickness of the thin-walled section 320 of the first connection structure 300 is preferably equal to the thickness of the third connection structure 500. The above thickness parameters are obtained based on the dynamic topology optimization method of the equivalent static load method. The specific thickness of each structure of the mixed multi-cell thin-walled structure energy absorbing tube 620 can be referred to. Figure 3 Schematic diagram shown.

[0055] It should be understood that the thickness of each position of the central structure 200, the first connection structure 300, the second connection structure 400, and the third connection structure 500 is substantially equal. The maximum wall thickness of the mixed multi-cell thin-walled structure energy absorbing tube 620 means that the maximum thickness of the energy absorbing tube is anchored as T. For example, if the thickness of the central structure 200 of the energy absorbing tube is the largest, then T=T3. Similarly, if the thickness of the second connection structure 400 is the largest, then T=T2. If the thickness of the central structure 200 and the second connection structure 400 are equal, then T=T3=T2.

[0056] In order to verify the energy absorption effect of the mixed multi-cell thin-walled structure energy absorption tube 620 of this embodiment, this embodiment designs a control experiment. The control experiment adopts Figure 4 The traditional window-type multi-cell structure energy-absorbing tube shown, Figure 5 The bionic tree-like fractal structure energy-absorbing tube shown in the figure is shown in the figure. Figure 4 , Figure 5It can be seen that the internal structure of the energy absorbing tube in the control experiment is quite different from that of the energy absorbing tube in this embodiment. Currently, the key indicators commonly used to measure the energy absorption performance of thin-walled structures are as follows: overall energy absorption EA, specific energy absorption SEA, average collision force MCF, maximum peak collision force PCF, and collision efficiency CFE, where the specific definitions of each key parameter are as follows:

[0057] The total energy absorption EA, in kJ, refers to the total energy absorbed by the structure during the impact process and is defined as follows:

[0058]

[0059] In the formula, F(x) represents the instantaneous impact force, and d refers to the effective impact distance.

[0060] Specific energy absorption SEA, in kJ / kg, refers to the energy absorbed by a structure per unit mass and is defined as follows:

[0061]

[0062] Where M is the structural mass.

[0063] The mean collision force MCF, in kN, refers to the average load on the structure during the impact process and is defined as follows:

[0064]

[0065] Where d refers to the effective impact distance.

[0066] The maximum peak impact force PCF, in kN, represents the strongest reaction force generated by the structure when it is impacted. Excessive impact force may cause serious injury and damage to personnel or structures; for axial impact, the maximum peak impact force usually occurs in the initial stage of compression, and the specific definition is as follows:

[0067] PCF = max(F(x));

[0068] Collision efficiency CFE refers to the ratio of MCF to PCF. The closer the value of this index is to 1, the more stable the energy absorption process of the structure is. It is defined as follows:

[0069]

[0070] The experimental data are shown in the following table:

[0071]

[0072] Among them, MMTS represents the mixed multi-cellular thin-walled structure energy absorbing tube 620 of this embodiment, WMCS represents the traditional window-type multi-cellular structure energy absorbing tube, TFS represents the bionic tree-like fractal structure energy absorbing tube; T represents the depth of the depression.

[0073] It can be seen from the above table that the values ​​of various parameters of the hybrid multi-cellular thin-walled structure energy-absorbing tube 620 of this embodiment, including overall energy absorption EA, specific energy absorption SEA, average collision force MCF, maximum peak collision force PCF, and collision efficiency CFE, are better than those of the other two energy-absorbing tubes. Therefore, the hybrid multi-cellular thin-walled structure energy-absorbing tube 620 of this embodiment has a better energy absorption effect, and can thus better protect the safety of the vehicle battery.

[0074] Reference Figure 6 As shown, the battery pack of the second embodiment of the present invention comprises a housing 600, a battery assembly 610 and the above-mentioned energy absorbing tube, the battery assembly 610 is installed in the housing 600, and the periphery of the battery assembly 610 is connected to the housing 600 through a plurality of mixed multi-cell thin-walled structure energy absorbing tubes 620. Since the battery pack of the embodiment of the present invention comprises the above-mentioned energy absorbing tube, it at least has all the beneficial effects of the energy absorbing tube; the battery pack of this embodiment has good energy absorbing effect, can reduce the damage of the battery assembly 610, and has high safety.

[0075] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification.

[0076] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. An energy absorbing tube, characterized in that: include: The outer shell is provided with a plurality of outer planes, and the connection points of the plurality of outer planes are all provided with a collapse groove which is concave toward the center, and the collapse groove has a groove bottom surface and two groove wall surfaces, and the connection point between the groove bottom surface and the groove wall surface forms a first rib; A central structure is provided through the outer shell and is concentrically arranged with the outer shell; the central structure has a plurality of second ribs, the number of the second ribs is equal to the number of the first ribs, and the plurality of the second ribs correspond to the plurality of the first ribs one by one; A plurality of first connecting structures, used for connecting the corresponding first ribs and the second ribs; A plurality of second connection structures, both ends of which are respectively connected to the first connection structures of adjacent collapse grooves, and the second connection structures are provided with a plurality of third ribs; A plurality of third connection structures are parallel to the groove wall surface and are used to connect the third edges and the outer plane.

2. The energy absorbing tube according to claim 1, characterized in that: The outer shell and the central structure are both axisymmetric and central rotationally symmetrical structures.

3. The energy absorbing tube according to claim 1, characterized in that: The central structure has a plurality of first surfaces and a plurality of second surfaces, the plurality of first surfaces and the second surfaces are alternately arranged around a circumference, and the second ribs are formed at the connection between the first surfaces and the second surfaces; The first surface is parallel to the outer plane, and the second surface is parallel to the groove bottom surface.

4. The energy absorbing tube according to claim 1, characterized in that: The first connection structure includes a thick-walled section and a thin-walled section, the thick-walled section is connected to the central structure, and the thin-walled section is connected to the outer shell; the connection between the thick-walled section and the thin-walled section is connected to the end of the second connection structure.

5. The energy absorbing tube according to claim 1, characterized in that: The second connecting structure is bent in a direction away from the central structure to form a plurality of the third ribs.

6. The energy absorbing tube according to claim 3, characterized in that: The second connection structure is provided with a third surface and a fourth surface, the third surface is parallel to the first surface, the fourth surface is used to connect the third surface and the first connection structure, and the connection between the third surface and the fourth surface forms the third rib.

7. The energy absorbing tube according to claim 1, characterized in that: The distance between the two oppositely arranged outer planes is H, and the thickness of the outer shell, the central structure, the first connecting structure, the second connecting structure and the third connecting structure is no more than 0.05H.

8. The energy absorbing tube according to claim 1, characterized in that: The thickness of each position of the outer shell is equal, and the thickness of the outer shell is not greater than the thickness of the central structure, the first connecting structure, the second connecting structure, and the third connecting structure.

9. The energy absorbing tube according to claim 1, characterized in that: The energy absorbing tube is made of one material.

10. A battery pack, characterized in that: It comprises a shell, a battery assembly and the energy absorbing tube as claimed in any one of claims 1 to 9, wherein the battery assembly is installed in the shell, and the periphery of the battery assembly is connected to the shell through a plurality of the energy absorbing tubes.

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