Cantilever part and lithium battery equipment

Abstract

The utility model discloses a cantilever piece and lithium battery equipment, the cantilever piece is used for the lithium battery equipment, the cantilever piece is connected with a base frame of the lithium battery equipment, the cantilever piece comprises a base body, and the base body is arranged in an extending mode along a first direction and is used for fixing a battery. A connecting part is arranged at one end, in the first direction, of the base body and suitable for being connected with a base frame. In the first direction, the base body is provided with a first part close to the connecting part and a second part away from the connecting part. Wherein the plane perpendicular to the first direction is a first projection plane. In the first direction, the first part forms a first orthographic projection on the first projection plane, and the second part forms a second orthographic projection on the first projection plane. The projection area of the second orthographic projection is smaller than that of the first orthographic projection, and the second orthographic projection is located in the first orthographic projection. The battery bearing stability of the cantilever part can be improved, and the processing quality of the battery is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium battery equipment, in particular to a cantilever component and lithium battery equipment. Background Art

[0002] Lithium battery equipment is used to process batteries. The cantilever structure in the lithium battery equipment is used to carry the batteries. One end of the cantilever structure is connected to the large plate base frame through a motor module, and can move relative to the large plate base frame to realize the transportation of the batteries. In the related technology, the cross-sectional area of ​​the cantilever structure along its extension direction is evenly arranged. When the lithium battery equipment is in a high-speed and heavy-load condition, the end of the cantilever structure that is away from the large plate base frame is prone to large vibrations, which seriously affects the stability of the cantilever structure in carrying the battery and affects the processing quality of the battery. Utility Model Content

[0003] The main purpose of the utility model is to provide a cantilever component and a lithium battery device, aiming to solve the technical problem of excessive shaking amplitude of the cantilever structure.

[0004] To achieve the above-mentioned purpose, the first embodiment of the utility model provides a cantilever for a lithium battery device, wherein the lithium battery device comprises a base frame, the cantilever is connected to the base frame, and the cantilever comprises:

[0005] A base body is arranged to extend along a first direction, the base body is used to fix the battery, one end of the base body along the first direction is provided with a connecting portion, the connecting portion is suitable for connecting with the base frame, and along the first direction, the base body has a first portion close to the connecting portion and a second portion away from the connecting portion;

[0006] Among them, the plane perpendicular to the first direction is the first projection plane, along the first direction, the first part forms a first orthographic projection on the first projection plane, the second part forms a second orthographic projection on the first projection plane, the projection area of ​​the second orthographic projection is smaller than the projection area of ​​the first orthographic projection and the second orthographic projection is located within the first orthographic projection.

[0007] In some embodiments, along the first direction, the substrate includes a third portion located between the first portion and the second portion, the third portion forms a third orthographic projection on the first projection plane, the projection area of ​​the third orthographic projection is smaller than the projection area of ​​the first orthographic projection and the third orthographic projection is located within the first orthographic projection.

[0008] In some embodiments, the base includes a first supporting portion and a second supporting portion arranged opposite to each other along a second direction, the second direction being perpendicular to the first direction, the first supporting portion having a first end located at the first portion and a second end located at the second portion, the second supporting portion having a third end located at the first portion and a fourth end located at the second portion;

[0009] The first end is connected to the third end, the second end is connected to the fourth end, and the first supporting portion and the second supporting portion together enclose a first gap extending along a vertical direction, and the vertical direction is perpendicular to the first direction and the second direction.

[0010] In some embodiments, the first support portion is provided with a plurality of second gaps extending along the second direction, and each of the second gaps is arranged at intervals along the first direction; and / or, the second support portion is provided with a plurality of third gaps extending along the second direction, and each of the third gaps is arranged at intervals along the first direction.

[0011] In some embodiments, a plane perpendicular to the second direction is a second projection plane, and along the second direction, the first support portion forms a fourth orthographic projection on the second projection plane, and the second support portion forms a fifth orthographic projection on the second projection plane, and the fourth orthographic projection coincides with the fifth orthographic projection.

[0012] In some embodiments, the base has a middle surface parallel to the second projection plane, the first support portion and the second support portion are symmetrically arranged about the middle surface, and along the second direction, the first support portion has a side wall facing away from the middle surface;

[0013] From the first part to the second part, the distance from the side wall to the middle surface along the second direction gradually decreases, and the first gap gradually decreases.

[0014] In some embodiments, the material of the substrate is an aluminum alloy material, and the first supporting portion and the second supporting portion are arranged integrally.

[0015] In some embodiments, the base is provided with a plurality of fourth gaps extending along the second direction, each of the fourth gaps is arranged at intervals along the first direction, and the second direction is perpendicular to the first direction.

[0016] In some embodiments, the first part has a first top surface located on the upper side, the second part has a second top surface located on the upper side, the first part and the second part are arranged integrally, and along the vertical direction, the first top surface is located on the side of the second top surface away from the fourth gap, and the vertical direction is perpendicular to the first direction and the second direction.

[0017] The second aspect of the present invention provides a lithium battery device, comprising the cantilever member described in the above embodiment, and also comprising a base frame, wherein the cantilever member is connected to the base frame.

[0018] Compared with the prior art, the beneficial effects of the utility model include:

[0019] In the technical solution of the utility model, the cantilever member includes a base, and the connecting portion of one end of the base along the first direction is connected to the base frame. Along the first direction, the base has a first part close to the connecting portion and a second part away from the connecting portion. The plane perpendicular to the first direction is set as the first projection plane, and the first part forms a first orthographic projection on the first projection plane, and the second part forms a second orthographic projection on the first projection plane. Compared with the solution of using a uniform cross-sectional area in the existing cantilever structure, the projection area of ​​the second orthographic projection in this solution is smaller than the projection area of ​​the first orthographic projection and the second orthographic projection is located within the first orthographic projection, that is, the cross-sectional area of ​​the first part along the direction perpendicular to the first direction is greater than the cross-sectional area of ​​the second part along the direction perpendicular to the first direction. Therefore, the connection between the first part of the cantilever member and the base frame in this solution is more stable, and because the second part is smaller in structure relative to the first part, the solution can effectively suppress the vibration of the second part, improve the stability of the cantilever member carrying the battery, and ensure the processing quality of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0021] Figure 1 This is a schematic diagram of the structure of the lithium battery device in the first embodiment of the utility model, wherein the cantilever and the base frame are shown;

[0022] Figure 2 It is a schematic diagram of the structure of the lithium battery device in the second embodiment of the utility model, wherein the cantilever and the base frame are shown;

[0023] Figure 3 It is a structural schematic diagram of the cantilever member in the first embodiment of the utility model;

[0024] Figure 4 It is a schematic diagram of the cantilever member in the first embodiment of the utility model observed along the vertical direction;

[0025] Figure 5 It is a schematic structural diagram of a cantilever member in a second embodiment of the utility model;

[0026] Figure 6 It is a schematic diagram of the cantilever member in the second embodiment of the utility model observed along the second direction.

[0027] Description of Figure Numbers:

[0028] Lithium battery equipment 1;

[0029] Cantilever member 10;

[0030] Base 100; connecting portion 110; first portion 120; first top surface 121; second portion 130;

[0031] The second top surface 131; the third portion 140; the first support portion 150; the first end 151; the second end 152;

[0032] second gap 153; side wall 154; second support portion 160; third end 161; fourth end 162; third gap 163; first gap 170; fourth gap 180; middle surface 190;

[0033] Base frame 20;

[0034] First direction X; second direction Y; vertical direction Z.

[0035] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0037] The first embodiment of the utility model proposes a cantilever member 10, which is used for a lithium battery device 1. The cantilever member 10 can ensure its stability when carrying a battery. It should be noted that the lithium battery device 1 includes a base frame 20, and the cantilever member 10 is connected to the base frame 20. Furthermore, the cantilever member 10 can be connected to the base frame 20 through a driving component, so that the cantilever member 10 can move relative to the base frame 20 to realize the transportation of the battery. The specific driving setting of the cantilever member 10 can refer to the relevant known technology. Figures 1 to 6 The cantilever component 10 according to the embodiment of the present application is introduced. Specifically, the cantilever component 10 includes a base body 100 .

[0038] Reference Figure 1 and Figure 2, the specific substrate 100 is introduced below. For the convenience of description and understanding, a first direction X is defined, and the substrate 100 is arranged to extend along the first direction X. Figure 1 The orientation in FIG. 1 is for reference, that is, the base 100 is arranged to extend in the left-right direction. The base 100 is used to fix the battery. Specifically, refer to Figure 1 In some embodiments, the base 100 can fix two rollers arranged opposite to each other, and the gap between the two rollers can be used to fix the separator of the battery. Figure 2 In other embodiments, the substrate 100 can absorb and fix the pole piece of the battery. The specific use of the substrate 100 can be determined according to actual conditions.

[0039] The specific arrangement of the substrate 100 is described below. A connecting portion 110 is provided at one end of the substrate 100 along the first direction X, and the connecting portion 110 is suitable for connecting to the base frame 20. It can be understood that the connecting portion 110 can be detachably connected to the base frame 20. Specifically, the connecting portion 110 can be bolted to the base frame 20. Along the first direction X, the substrate 100 has a first portion 120 close to the connecting portion 110 and a second portion 130 away from the connecting portion 110. The division arrangement of the first portion 120 and the second portion 130 is described below. It is assumed that the substrate 100 has a middle plane perpendicular to the first direction X, and the distances from the two ends of the substrate 100 along the first direction X to the center plane are equal. The portion of the substrate 100 on the side of the center plane close to the connecting portion 110 is the first portion 120, and the portion of the substrate 100 on the side of the center plane away from the connecting portion 110 is the second portion 130.

[0040] The relative sizes of the first part 120 and the second part 130 are introduced below. For ease of understanding, a first projection plane is defined. The plane perpendicular to the first direction X is set as the first projection plane. Along the first direction X, the first part 120 forms a first orthographic projection on the first projection plane, and the second part 130 forms a second orthographic projection on the first projection plane. The projection area of ​​the second orthographic projection is smaller than the projection area of ​​the first orthographic projection and the second orthographic projection is located within the first orthographic projection. In other words, the cross-sectional area of ​​the first part 120 along the direction perpendicular to the first direction X is greater than the cross-sectional area of ​​the second part 130 along the direction perpendicular to the first direction X, and when observed along the first direction X, the second part 130 is within the first part 120.

[0041] In the technical solution of the utility model, the cantilever member 10 includes a base 100, and a connecting portion 110 at one end of the base 100 along a first direction X is connected to a base frame 20. The base 100 has a first portion 120 close to the connecting portion 110 and a second portion 130 away from the connecting portion 110 along the first direction X. A plane perpendicular to the first direction X is set as a first projection plane, and the first portion 120 forms a first orthographic projection on the first projection plane, and the second portion 130 forms a second orthographic projection on the first projection plane. Compared with the existing cantilever structure using a uniform cross-sectional area, the projection area of ​​the second orthographic projection in this solution is smaller than the projection area of ​​the first orthographic projection and the second orthographic projection is located within the first orthographic projection, that is, the cross-sectional area of ​​the first part 120 along the direction perpendicular to the first direction X is greater than the cross-sectional area of ​​the second part 130 along the direction perpendicular to the first direction X. Therefore, in this solution, the connection between the first part 120 of the cantilever member 10 and the base frame 20 is more stable, and because the second part 130 is smaller than the first part 120, the present solution can effectively suppress the vibration of the second part 130, thereby improving the stability of the cantilever member 10 in carrying the battery and ensuring the processing quality of the battery.

[0042] Reference Figure 1 and Figure 2 , the third part 140 of the substrate 100 is introduced below. In some embodiments, along the first direction X, the substrate 100 includes the third part 140 located between the first part 120 and the second part 130. In some embodiments, the two ends of the third part 140 along the first direction X can be connected to the first part 120 and the second part 130 respectively. In other embodiments, the third part 140 can also be spaced from the first part 120 and the second part 130. Some embodiments of the present application are described by taking the third part 140 as an example of connecting the first part 120 and the second part 130.

[0043] The third part 140 forms a third orthographic projection on the first projection plane, and the projection area of ​​the third orthographic projection is smaller than the projection area of ​​the first orthographic projection and the third orthographic projection is located within the first orthographic projection. In other words, the cross-sectional area of ​​the third part 140 along the perpendicular direction X is smaller than the cross-sectional area of ​​the first part 120 along the perpendicular direction X. When viewed along the first direction X, the third part 140 is within the first part 120. The above arrangement of this solution can further suppress the vibration of the second part 130 and improve the stability of the cantilever 10 carrying the battery.

[0044] It should be noted that in some embodiments, the projection area of ​​the third orthographic projection may be equal to the projection area of ​​the second orthographic projection. In other embodiments, the projection area of ​​the third orthographic projection may also be greater than the projection area of ​​the second orthographic projection. The relative sizes of the second portion 130 and the third portion 140 may be determined according to actual conditions.

[0045] Reference Figure 3 and Figure 4 The specific structure of the substrate 100 in some embodiments is described below. For ease of description and understanding, a second direction Y and a vertical direction Z are defined. The second direction Y is perpendicular to the first direction X, and the vertical direction Z is perpendicular to the first direction X and the second direction Y. Figure 3 With the orientation in as reference, the second direction Y points to the left and right direction, and the vertical direction Z points to the up and down direction.

[0046] The base 100 includes a first support portion 150 and a second support portion 160 arranged opposite to each other along the second direction Y. The first support portion 150 and the second support portion 160 can carry a battery together. The specific structures of the first support portion 150 and the second support portion 160 can be the same or different. Some embodiments of the present application are described by taking the first support portion 150 and the second support portion 160 having the same structure as an example.

[0047] The first support portion 150 has a first end 151 and a second end 152 that are oppositely arranged along the first direction X. The first end 151 is located at the first portion 120, and the second end 152 is located at the second portion 130. Figure 3 As a reference, the first end 151 is located at the left end of the first support portion 150, and the second end 152 is located at the right end of the first support portion 150. The second support portion 160 has a third end 161 and a fourth end 162 arranged opposite to each other along the first direction X, the third end 161 is located at the first portion 120, and the fourth end 162 is located at the second portion 130. Figure 3 As a reference, the third end 161 is located at the left end of the first support portion 150, and the fourth support portion is located at the right end of the first support portion 150. The first end 151 is connected to the third end 161, the second end 152 is connected to the fourth end 162, and the first support portion 150 and the second support portion 160 are together surrounded to form a first gap 170 extending along the vertical direction Z. The first gap 170 is provided in this solution, which can reduce the self-weight of the base 100 while ensuring the structural strength of the base 100, and can not only reduce the vibration of the cantilever 10, but also save materials.

[0048] Reference Figure 3In some embodiments, the first support portion 150 is provided with a plurality of second gaps 153 extending along the second direction Y, and each second gap 153 is arranged at intervals along the first direction X. It can be understood that the size and shape of each second gap 153 can be the same or different. The specific setting of the number, size and shape of the second gaps 153 can be determined according to actual conditions. It should be noted that the second gap 153 can be formed by openings in the first support portion 150, or can be formed by setting reinforcing ribs. Some embodiments of the present application are explained by taking the second gap 153 enclosed by reinforcing ribs as an example. In this solution, the first support portion 150 is provided with a plurality of second gaps 153, that is, it can reduce the self-weight of the base 100 on the basis of ensuring that the first support portion 150 has sufficient structural strength, improve the deformation resistance of the cantilever 10, and save materials.

[0049] Reference Figure 3 In some embodiments, the second support portion 160 is provided with a plurality of third gaps 163 extending along the second direction Y, and each third gap 163 is arranged at intervals along the first direction X. It can be understood that the size and shape of each third gap 163 can be the same or different. The specific setting of the number, size and shape of the third gaps 163 can be determined according to actual conditions. It should be noted that the third gap 163 can be formed by openings in the second support portion 160, or can be enclosed by setting reinforcing ribs. Some embodiments of the present application are described by taking the third gap 163 enclosed by reinforcing ribs as an example. In this solution, the second support portion 160 is provided with a plurality of third gaps 163, that is, it can reduce the self-weight of the base 100 on the basis of ensuring that the second support portion 160 has sufficient structural strength, improve the deformation resistance of the cantilever 10, and save materials.

[0050] Reference Figure 4 In some embodiments, in order to facilitate the description and understanding of the specific structural relationship between the first support portion 150 and the second support portion 160, a second projection plane is defined, and the plane perpendicular to the second direction Y is set as the second projection plane. Along the second direction Y, the first support portion 150 forms a fourth orthographic projection on the second projection plane, and the second support portion 160 forms a fifth orthographic projection on the second projection plane. The fourth orthographic projection coincides with the fifth orthographic projection. In other words, the shape and size of the first support portion 150 are the same as those of the second support portion 160. The above arrangement is convenient for processing the first support portion 150 and the second support portion 160, and can also ensure the stability of the structure on both sides of the substrate 100 along the second direction Y.

[0051] Reference Figure 3 and Figure 4In some embodiments, the base 100 is gradually arranged along the first direction X. Specifically, it is first set that the base 100 has a middle surface 190 parallel to the second projection plane, and the first support portion 150 and the second support portion 160 are symmetrically arranged about the middle surface 190. Along the second direction Y, the first support portion 150 has a side wall 154 that faces away from the middle surface 190. From the first part 120 to the second part 130, the distance from the side wall 154 to the middle surface 190 along the second direction Y gradually decreases, that is, the base 100 is arranged in a contracted manner. Moreover, from the first part 120 to the second part 130, the first gap 170 gradually decreases. This solution can effectively improve the deformation resistance of the base 100, improve the stability of the cantilever 10 carrying the battery, and can also save materials.

[0052] In some embodiments, the first support portion 150 and the second support portion 160 are arranged in one piece, which can simplify the assembly and disassembly process between the base 100 and the base frame 20, avoid the problem of too large installation clearance, improve the stability of the overall structure of the cantilever 10, and ensure the reliability of the movement of the cantilever 10 relative to the base frame 20. In other embodiments, the material of the base 100 is an aluminum alloy material. Compared with the solution of using steel material as the base 100, this solution can effectively reduce the weight of the cantilever 10, reduce the inertia, and improve the deformation resistance of the base 100. It should be noted that the base 100 can be processed by casting.

[0053] Reference Figure 5 and Figure 6 The following describes the structural arrangement of the substrate 100 in other embodiments. For ease of description and understanding, a second direction Y and a vertical direction Z are defined. The second direction Y is perpendicular to the first direction X, and the vertical direction Z is perpendicular to the first direction X and the second direction Y. Figure 5 With the orientation in as reference, the second direction Y points to the left and right direction, and the vertical direction Z points to the up and down direction.

[0054] Reference Figure 5 , the base 100 is provided with a plurality of fourth gaps 180 extending along the second direction Y. Each fourth gap 180 is arranged at intervals along the first direction X, and the shape of the fourth gap 180 can be circular, polygonal or long strip, etc. It can be understood that the size and shape of each fourth gap 180 can be the same or different. The specific setting of the number, size and shape of the fourth gap 180 can be determined according to actual conditions. Further, the fourth gap 180 can be formed by openings in the base 100. In this solution, the base 100 is provided with a plurality of fourth gaps 180, that is, it can reduce the weight of the base 100 on the basis of ensuring that the base 100 has sufficient structural strength, improve the deformation resistance of the cantilever 10, and save materials. It should be noted that the cantilever 10 of this embodiment can be used to adsorb the pole piece of the battery, which can improve the alignment of the pole piece, reduce the risk of wrinkles, and ensure the quality of battery molding.

[0055] Reference Figure 5 and Figure 6 In some embodiments, the first part 120 has a first top surface 121 located at the upper side, the second part 130 has a second top surface 131 located at the upper side, and the first part 120 and the second part 130 are arranged integrally. Figure 6 The orientation in is used as a reference, that is, along the up-down direction, the first top surface 121 is located on the side of the second top surface 131 away from the fourth gap 180. In other words, along the up-down direction, the first top surface 121 is higher than the second top surface 131. The above arrangement of this solution can not only improve the stability of the cantilever 10 carrying the battery, but also facilitate the processing of the base 100 and save materials.

[0056] The following describes the specific design process of the cantilever 10 in some embodiments. Specifically, the cantilever 10 can be topologically optimized by using the simulation software Hyperwork in combination with the computer-aided engineering method. The optimization mathematical model can be expressed as: objective function: f(X) = f(x1, x2…x n ). Constraint: g j (X)≤0, j=1, …m; h k (X)≤0, k=1, …m; Where X=(x1,x2…x n ) is a design variable, such as the structural dimensions of the product; f(X) is a design goal, such as mechanical properties or weight; g(X) and h(X) are constrained design responses, such as structural working deformation and stress constraints. Find the optimal material distribution and mechanical transfer path in a given design space, so as to obtain the lightest design while meeting various performance requirements. The structural design method flow includes the following steps: by defining the design and non-design areas, the model is meshed discretized, the center of gravity of the load-bearing object is coupled with the joint of the manipulator, a three-dimensional unit load is applied, the deformation (stiffness) under unit load is taken as the target, the target is maximized, the upper limit (mass) of the material removal volume is constrained, the structure is 3D reconstructed through topology optimization, and the processed structure is output.

[0057] Reference Figure 1 and Figure 2 The second embodiment of the utility model proposes a lithium battery device 1, which includes the cantilever member 10 of the above embodiment and also includes a base frame 20. The cantilever member 10 is connected to the base frame 20. The connection between the first part 120 of the cantilever member 10 and the base frame 20 in the lithium battery device 1 of this solution is more stable, and because the second part 130 is smaller than the first part 120, the solution can effectively suppress the vibration of the second part 130, improve the stability of the cantilever member 10 carrying the battery, and ensure the processing quality of the battery.

[0058] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0059] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or", "and / or" or "and / or" appears in the full text, its meaning includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0060] The above are only preferred embodiments of the present invention, and do not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the utility model concept, or directly / indirectly used in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A cantilever member (10) for a lithium battery device (1), wherein the lithium battery device (1) comprises a base frame (20), the cantilever member (10) being connected to the base frame (20), characterized in that: The cantilever member (10) comprises: A base (100) is arranged to extend along a first direction, the base (100) is used to fix a battery, one end of the base (100) along the first direction is provided with a connecting portion (110), the connecting portion (110) is suitable for connecting to the base frame (20), and along the first direction, the base (100) has a first portion (120) close to the connecting portion (110) and a second portion (130) away from the connecting portion (110); Among them, the plane perpendicular to the first direction is a first projection plane, along the first direction, the first part (120) forms a first orthographic projection on the first projection plane, and the second part (130) forms a second orthographic projection on the first projection plane, the projection area of ​​the second orthographic projection is smaller than the projection area of ​​the first orthographic projection and the second orthographic projection is located within the first orthographic projection.

2. The cantilever member (10) according to claim 1, characterized in that: Along the first direction, the substrate (100) includes a third portion (140) located between the first portion (120) and the second portion (130), and the third portion (140) forms a third orthographic projection on the first projection plane, and the projection area of ​​the third orthographic projection is smaller than the projection area of ​​the first orthographic projection and the third orthographic projection is located within the first orthographic projection.

3. The cantilever member (10) according to claim 1, characterized in that: The base (100) comprises a first supporting portion (150) and a second supporting portion (160) arranged opposite to each other along a second direction, the second direction being perpendicular to the first direction, the first supporting portion (150) having a first end (151) located at the first portion (120) and a second end (152) located at the second portion (130), and the second supporting portion (160) having a third end (161) located at the first portion (120) and a fourth end (162) located at the second portion (130); The first end (151) is connected to the third end (161), the second end (152) is connected to the fourth end (162), and the first supporting portion (150) and the second supporting portion (160) are together formed to form a first gap (170) extending along a vertical direction, wherein the vertical direction is perpendicular to the first direction and the second direction.

4. The cantilever member (10) according to claim 3, characterized in that: The first supporting portion (150) is provided with a plurality of second gaps (153) extending along the second direction, and each of the second gaps (153) is arranged at intervals along the first direction; and / or, The second supporting portion (160) is provided with a plurality of third gaps (163) extending along the second direction, and the third gaps (163) are arranged at intervals along the first direction.

5. The cantilever member (10) according to claim 3, characterized in that: A plane perpendicular to the second direction is a second projection plane. Along the second direction, the first support portion (150) forms a fourth orthographic projection on the second projection plane, and the second support portion (160) forms a fifth orthographic projection on the second projection plane. The fourth orthographic projection coincides with the fifth orthographic projection.

6. The cantilever member (10) according to claim 5, characterized in that: The base (100) has a middle surface (190) parallel to the second projection plane, the first support portion (150) and the second support portion (160) are symmetrically arranged about the middle surface (190), and along the second direction, the first support portion (150) has a side wall (154) facing away from the middle surface (190); From the first part (120) to the second part (130), the distance from the side wall (154) to the middle surface (190) along the second direction gradually decreases, and the first gap (170) gradually decreases.

7. The cantilever member (10) according to claim 3, characterized in that: The material of the base (100) is an aluminum alloy material, and the first support portion (150) and the second support portion (160) are arranged in one piece.

8. The cantilever member (10) according to claim 1, characterized in that: The base body (100) is provided with a plurality of fourth gaps (180) extending along a second direction, each of the fourth gaps (180) being arranged at intervals along the first direction, and the second direction is perpendicular to the first direction.

9. The cantilever member (10) according to claim 8, characterized in that: The first part (120) has a first top surface (121) located on the upper side, and the second part (130) has a second top surface (131) located on the upper side. The first part (120) and the second part (130) are arranged integrally. In the vertical direction, the first top surface (121) is located on the side of the second top surface (131) away from the fourth gap (180), and the vertical direction is perpendicular to the first direction and the second direction.

10. A lithium battery device (1), characterized in that: It comprises the cantilever member (10) according to any one of claims 1 to 9, and also comprises a base frame (20), wherein the cantilever member (10) is connected to the base frame (20).

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