Aluminum sheet bracket for battery module

Abstract

The present invention provides an aluminum sheet bracket for a battery module, belonging to the technical field of power batteries, and comprising: an aluminum sheet terminal, the aluminum sheet terminal having two electrode mounting seats and two mounting parts, the aluminum sheet terminal being centrally symmetrical relative to a geometric center; a plastic bracket, the plastic bracket having a through hole adapted to the outer contour of the aluminum sheet terminal, the through hole being provided with two plug-in parts, the two mounting parts being fixedly connected to the two plug-in parts. By arranging the aluminum sheet terminal in the through hole, the battery cell is isolated, and a chain reaction caused by a battery cell explosion accident is avoided, and the structure reduces the probability of damage to the aluminum sheet bracket during preparation, transportation and assembly.

Description

Technical Field

[0001] The present application relates to the technical field of power batteries, and in particular to an aluminum sheet bracket for a battery module. Background Art

[0002] As the popularity of new energy vehicles in the market is gradually increasing and new energy battery technology is advancing by leaps and bounds, the most concerned issues about batteries are how to make batteries explosion-proof and how to efficiently complete assembly operations. As an important component of the battery module, the battery cover assembly is of utmost importance for how to scientifically design the battery cover assembly to meet the requirements of explosion-proof while avoiding damage during preparation, transportation and assembly. The aluminum sheet bracket is one of the battery cover assemblies. The aluminum sheet is used to electrically connect to the battery cell, and the bracket is used to provide good support for the aluminum sheet.

[0003] In the prior art, the number of cells corresponding to the aluminum sheet bracket is small, and most of them are single cell connections. For example, the Chinese invention patent with application number 201911144960.4 discloses only one cell. In this case, the preparation, transportation and assembly process of the aluminum sheet bracket is relatively simple, and the probability of damage during transportation is small. In the case of a large number of cells, the prior art uses soft conductive sheets to connect them, but the use of soft conductive sheets to connect cells may cause deformation of the soft conductive sheets, and it is difficult to weld the soft conductive sheets to the cells and cannot provide effective explosion-proof effects. Summary of the invention

[0004] In order to solve the above problems, the purpose of the present invention is to provide an aluminum sheet bracket for a battery module. By arranging the aluminum sheet terminal in the through hole, the battery cells are isolated to avoid the chain reaction caused by the battery cell explosion accident, and the structure reduces the probability of damage to the aluminum sheet bracket during preparation, transportation and assembly.

[0005] The present invention adopts the following technical solution:

[0006] An aluminum sheet bracket for a battery module comprises: an aluminum sheet terminal, the aluminum sheet terminal having two electrode mounting seats and two mounting portions, the aluminum sheet terminal being centrally symmetrical relative to a geometric center; a plastic bracket, the plastic bracket having a through hole adapted to the outer contour of the aluminum sheet terminal, two plug-in portions being arranged in the through hole, the two mounting portions being fixedly connected to the two plug-in portions.

[0007] Furthermore, the two plug-in parts include a first plug-in part and a second plug-in part, the first plug-in part can swing, the second plug-in part can elastically expand and contract, and the first plug-in part and the second plug-in part are respectively arranged on opposite sides of the through hole.

[0008] Furthermore, the first plug-in part includes: a first base, which is fixedly connected to the wall of the through hole; a first fixing part, which is fixedly connected to a mounting part of the aluminum sheet terminal; and a necked part, which is arranged between the first base and the first fixing part.

[0009] Furthermore, the cross-section of the necked portion has different cutout shapes on the inner side and the outer side; the cutout shape of the inner side is an isosceles trapezoid, and the cutout of the outer side is an isosceles triangle with an arc-shaped top angle; the axis of the isosceles trapezoid is closer to the mounting portion of the aluminum sheet terminal than the axis of the isosceles triangle.

[0010] Furthermore, the endpoint of the upper base of the isosceles trapezoid close to one side of the isosceles triangle intersects with the half side of the arc vertex of the isosceles triangle close to the aluminum sheet terminal mounting portion along the extension line of its own axis, and the arc length between the intersection and the endpoint of the arc close to one side of the aluminum sheet terminal mounting portion is 1 / 6-1 / 8 of the total length of the arc; the endpoint of the upper base of the isosceles trapezoid away from one side of the isosceles triangle is located on the edge of the isosceles triangle along the extension line of its own axis.

[0011] Furthermore, the second plug-in part includes: a second base, which is fixedly connected to the side wall of the through hole; a second fixing part, which is fixedly connected to another mounting part of the aluminum sheet terminal; and an elastic part, which is arranged between the second base and the second fixing part.

[0012] Furthermore, the cross-section of the elastic portion includes a first extension portion and a second extension portion of the same thickness; one end of the first extension portion is fixedly connected to the second base and extends toward the inner side surface, one end of the second extension portion is fixedly connected to the other end of the first extension portion and extends toward the outer side surface, and the other end of the second extension portion is fixedly connected to the second fixing portion.

[0013] Furthermore, the connection between the first extension portion and the second extension portion is in an arc shape, and the curvature radius of the arc line located on the inner side surface is greater than the curvature radius of the arc line on the outer side surface.

[0014] Furthermore, the angle α between the inner side surface or outer side surface of the first extension portion and the normal of the aluminum sheet terminal is smaller than the angle β between the inner side surface or outer side surface of the second extension portion and the normal of the aluminum sheet terminal, and the difference between the angle α and the angle β is between 7-10°, and the angle α satisfies: 45°≤α≤55°.

[0015] Furthermore, a first angle is formed between a line connecting an endpoint of the upper base of the isosceles trapezoid close to one side of the isosceles triangle and a line connecting the arc vertex of the isosceles triangle and the normal of the aluminum sheet terminal; arc lines at the connection between the first extension and the second extension are both circular arcs, and a second angle is formed between a line connecting the centers of the inner and outer side surfaces and the normal of the aluminum sheet terminal; the absolute value of the difference between the first angle and the second angle is not greater than 5°; the arc radius at the connection between the first extension and the second extension is greater than the arc curvature radius of the isosceles triangle; the inner and outer side surfaces of the necking portion have a first minimum distance L1, and the inner and outer side surfaces of the first extension and the second extension have a second minimum distance L2, and the first minimum distance L1 and the second minimum distance L2 satisfy the following formula:

[0016] L1=λL2 and the value range of L2 is 1-1.5mm;

[0017] In the formula, λ is a correction coefficient, and its value range is 1-1.1; the distance between the length L3 of the aluminum sheet terminal, the length L4 of the necked portion, and the length L5 of the elastic portion satisfies the following formula: L3: L4: L5 = (27-29): 1: (1.4-1.6).

[0018] The present invention provides an aluminum sheet bracket for a battery module, which has the following beneficial technical effects compared with the prior art:

[0019] By arranging the aluminum sheet terminal in the through hole, the battery cells are isolated to avoid chain reactions caused by battery cell explosion accidents; secondly, in order to provide good support for the aluminum sheet terminal, two plug-in parts are provided in each through hole to provide good support for the aluminum sheet terminal, so that the probability of damage to the aluminum sheet bracket during preparation, transportation and assembly is reduced; finally, the aluminum sheet terminal is centrally symmetrical with respect to the geometric center, so that the aluminum sheet terminal has high stability, and a large rotation angle along the line connecting the two plug-in parts is avoided during the process of fixing the aluminum sheet terminal to the battery cell, which increases the difficulty of matching and centering with the battery cell and reduces the assembly efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0021] Figure 1 A three-dimensional diagram of an aluminum sheet bracket provided in an embodiment of the present invention;

[0022] Figure 2 A structural diagram of an aluminum sheet terminal provided in an embodiment of the present invention;

[0023] Figure 3 A structural diagram of a plastic bracket provided in an embodiment of the present invention;

[0024] Figure 4 A schematic diagram of the structure of a first plug-in portion provided in an embodiment of the present invention;

[0025] Figure 5 A schematic diagram of the necking structure provided by an embodiment of the present invention;

[0026] Figure 6 A schematic diagram of the structure of a second plug-in portion provided in an embodiment of the present invention;

[0027] Figure 7 This is a schematic diagram of the elastic part structure provided by an embodiment of the present invention.

[0028] Figure markings: 01, inner side; 02, outer side; 1, aluminum sheet terminal; 10, electrode mounting seat; 11, mounting portion; 110, filling hole; 2, plastic bracket; 20, through hole; 21, plug-in portion; 210, first plug-in portion; 2100, first base; 2101, first fixing portion; 2102, necking portion; 21020, isosceles trapezoid; 21021, isosceles triangle; 211, second plug-in portion; 2110, second base; 2111, second fixing portion; 2112, elastic portion; 21120, first extension portion; 21121, second extension portion. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0030] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0032] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the product of the invention is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0033] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] The embodiment of the present invention discloses an aluminum sheet bracket of a battery module, such as Figure 1-3 As shown, it includes: an aluminum sheet terminal 1, the aluminum sheet terminal 1 has two electrode mounting seats 10 and two mounting parts 11, and the aluminum sheet terminal 1 is centrally symmetrical relative to the geometric center O; a plastic bracket 2, the plastic bracket 2 has a through hole 20 adapted to the outer contour of the aluminum sheet terminal 1, and two plug-in parts 21 are arranged in the through hole 20, and the two mounting parts 11 are fixedly connected to the two plug-in parts 21.

[0035] The present invention isolates the battery cells by arranging the aluminum sheet terminal 1 in the through hole 20 to avoid a chain reaction caused by a battery cell explosion accident; secondly, in order to provide good support for the aluminum sheet terminal 1, two plug-in parts 21 are provided in each through hole 20 to provide good support for the aluminum sheet terminal 1, thereby reducing the probability of damage to the aluminum sheet bracket during preparation, transportation and assembly; finally, the aluminum sheet terminal 1 is centrally symmetrical with respect to the geometric center, so that the aluminum sheet terminal 1 has high stability, avoiding a large rotation angle along the line connecting the two plug-in parts 21 during the process of fixing the aluminum sheet terminal 1 to the battery cell, increasing the difficulty of matching and centering with the battery cell, and reducing the assembly efficiency.

[0036] In the embodiment of the present invention, the aluminum sheet bracket cooperates with other brackets to achieve isolation of each battery cell. The material of the plastic bracket 2 is selected from conventional materials in the prior art. Specifically, the electrode mounting seat 10 is formed into a mounting groove by stamping, and a welding hole is provided in the middle thereof to facilitate the subsequent welding of the aluminum sheet terminal 1 and the battery cell. The mounting portion 11 is stamped to have a step-like structure, and has a filling hole 110 thereon, which is used to fill the filling hole 110 with plastic during the preparation of the aluminum sheet bracket, thereby further improving the bonding strength of the plastic bracket 2 to the aluminum sheet terminal 1.

[0037] Specifically, the two plug-in parts 21 include a first plug-in part 210 and a second plug-in part 211, the first plug-in part 210 can swing, the second plug-in part 211 can elastically expand and contract, and the first plug-in part 210 and the second plug-in part 211 are respectively arranged on opposite sides of the through hole 20. It should be pointed out that the first plug-in part 210 can be swung and existing technologies such as hinge connection can be adopted. The second plug-in part 211 can be connected by a spring. The first plug-in part 210 and the second plug-in part 211 cooperate to prevent the aluminum sheet terminal 1 from being separated from the plastic bracket 2 due to the inability to effectively absorb kinetic energy when the external impact force is large. The second plug-in part 211 can absorb the kinetic energy well and cooperate with the first plug-in part 210 to realize the conversion and release of kinetic energy; secondly, during the installation of the aluminum sheet bracket, it cannot be guaranteed that all the battery cells can be in good contact with the aluminum sheet terminal 1 of the aluminum sheet bracket. By setting the first plug-in part 210 to be swingable and the second plug-in part 211 to be elastically retractable, the accuracy requirement for the alignment of the aluminum sheet terminal 1 and the battery cell can be reduced.

[0038] Specifically, Figure 4 As shown, the first plug-in portion 210 includes: a first base 2100, the first base 2100 is fixedly connected to the wall of the through hole 20; a first fixing portion 2101, the first fixing portion 2101 is fixedly connected to a mounting portion 11 of the aluminum sheet terminal 1; and a necking portion 2102, the necking portion 2102 is arranged between the first base 2100 and the first fixing portion 2101.

[0039] Specifically, Figure 5As shown, the cross section of the necked portion 2102 has different cutout shapes on the inner and outer sides; the cutout shape of the inner side 01 is an isosceles trapezoid 21020, and the cutout of the outer side 02 is an isosceles triangle 21021 with an arc-shaped vertex angle; the axis X1 of the isosceles trapezoid 21020 is closer to the mounting portion 11 of the aluminum sheet terminal 1 than the axis X2 of the isosceles triangle 21021. In the embodiment of the present invention, the "inner side" is the side close to the battery cell, and the "outer side" is the side away from the battery cell. The cutouts on both sides of the necking portion 2102 are set to different shapes in consideration of subsequent elastic deformation and explosion-proof considerations. Specifically, the upper base of the isosceles triangle 21021 has two endpoints. When the aluminum sheet terminal 1 drives the first plug-in portion 210 to swing, stress concentration is likely to occur at the two endpoints. When the swing reaches a set amplitude value, such as greater than 20°, the first plug-in portion 210 first breaks at the endpoints of the upper base of the isosceles trapezoid 21020, and the crack gradually extends. The cutout of the outer side surface 02 is set to an isosceles triangle 21021 with an arc-shaped vertex angle, which reduces stress concentration and causes the arc-shaped vertex angle to break at the end, thereby controlling the fracture behavior of the first plug-in portion 210. During an explosion, the aluminum sheet terminal and the portion of the first plug-in portion 210 fixedly connected thereto break and detach along a preset direction, thereby preventing the detached aluminum sheet terminal from being electrically connected to other normally functioning aluminum sheet terminals, resulting in a short circuit and causing a greater accident.

[0040] Specifically, the upper base of the isosceles trapezoid 21020, which is close to the endpoint P0 on one side of the isosceles triangle 21021, intersects with the half side of the arc vertex of the isosceles triangle 21021 close to the mounting portion 11 of the aluminum sheet terminal 1 along the extension line of its own axis, and the arc length between the intersection P1 and the endpoint P2 of the arc close to the mounting portion 11 of the aluminum sheet terminal 1 is 1 / 6-1 / 8 of the total length of the arc; the upper base of the isosceles trapezoid 21020, which is away from the endpoint P3 on one side of the isosceles triangle 21021, is located on the edge of the isosceles triangle 21021 along the extension line of its own axis, that is, on the straight edge of the isosceles triangle 21021, and the intersection point is P4. A circle is drawn with the line X3 between the arc vertex and the end point P0 as the radius and the end point P0 as the center. Within this range, there is an area between the end point P0 and the vertex arc line that is not much different from the minimum thickness. Therefore, under the condition that the fracture direction is controllable, the area of ​​the fracture path is increased, thereby preventing the plastic bracket 2 from being unable to break under preset conditions due to the large size of the injection molded part, resulting in uneven density or other physical properties, and causing greater losses.

[0041] Specifically, Figure 6As shown, the second plug-in portion 211 includes: a second base 2110, the second base 2110 is fixedly connected to the side wall of the through hole 20; a second fixing portion 2111, the second fixing portion 2111 is fixedly connected to the other mounting portion 11 of the aluminum sheet terminal 1; and an elastic portion 2112, the elastic portion 2112 is arranged between the second base 2110 and the second fixing portion 2111. The elastic portion 2112 can be as follows Figure 6 The integrated structure shown may also be a spring or other structure, as long as it can achieve elastic pulling of the aluminum sheet terminal 1 .

[0042] Specifically, Figure 7 As shown, the cross section of the elastic part 2112 includes a first extension part 21120 and a second extension part 21121 of the same thickness; one end of the first extension part 21120 is fixedly connected to the second base 2110 and extends toward the inner side surface 01, one end of the second extension part 21121 is fixedly connected to the other end of the first extension part 21120 and extends toward the outer side surface 02, and the other end of the second extension part 21121 is fixedly connected to the second fixing part 2111. The structure is simple, and is formed by integral injection molding of plastic material, so the preparation process is simple, the manufacturing cost is reduced, and the production efficiency is improved.

[0043] Specifically, the connection between the first extension part 21120 and the second extension part 21121 is in an arc shape, and the radius of curvature of the arc located on the inner side surface 01 is greater than the radius of curvature of the arc located on the outer side surface 02. The fracture mode of the second plug-in part 211 is slightly different from that of the first plug-in part 210, mainly in that the second plug-in part 211 is an elastic connection, which is straightened during the elastic deformation process, and the preferred fracture position is located at the connection between the first extension part 21120 and the second extension part 21121, and the connection point located on the outer side surface 02 is more likely to produce cracks; secondly, because the first plug-in part 210 only swings, and the second plug-in part 211 needs to undergo a large elastic deformation before breaking, therefore, it is necessary to specially design the connection between the first extension part 21120 and the second extension part 21121. Specifically, the first extension part 211 is elastically connected and straightened during the elastic deformation process. The preferred fracture position is located at the connection between the first extension part 21120 and the second extension part 21121, and the connection point located on the outer side surface 02 is more likely to produce cracks; secondly, because the first plug-in part 210 only swings, and the second plug-in part 211 needs to undergo a large elastic deformation before breaking, therefore, it is necessary to specially design the connection between the first extension part 21120 and the second extension part 21121. Specifically, the first extension part 211 is elastically connected and straightened during the elastic deformation process. The connection between 21120 and the second extension part 21121 adopts an arc connection to prevent stress concentration and cracks under conditions of small strain, which makes it impossible to push the aluminum sheet terminal 1 to move in a specific direction after the battery cell explodes. However, there is a problem at this time. If the first extension part 21120 and the second extension part 21121 are connected by an arc with the same curvature radius, the thickness of the connection is relatively large, which increases the difficulty of predicting the subsequent crack extension direction. Therefore, the curvature radius of the arc of the inner side surface 01 is larger than the curvature radius of the arc of the outer side surface 02, so as to reduce the thickness of the connection and increase the accuracy of the fracture path prediction.

[0044] Further, such as Figure 7 , the angle α between the inner side surface 01 or the outer side surface 02 of the first extension portion 21120 and the normal X4 of the aluminum sheet terminal 1 is smaller than the angle β between the inner side surface 01 or the outer side surface 02 of the second extension portion 21121 and the normal X4 of the aluminum sheet terminal 1, and the difference between the angle α and the angle β is between 7-10°, and the angle α satisfies: 45°≤α≤55°. Since the first extension portion 21120 and the second extension portion 21121 have different angles, the fracture path is shown as the connecting line X5, which is more conducive to throwing the aluminum sheet terminal 1 along a specific direction. Secondly, the difference between the angle α and the angle β and the angle of the angle α are limited, mainly for cooperation with the first plug-in portion 210, so as to realize that the aluminum sheet terminal 1 carries part of the first plug-in portion 210 and part of the second plug-in portion 211 and is thrown away along a specific direction.

[0045] In order to achieve good cooperation between the first plug-in portion 210 and the second plug-in portion 211, the aluminum sheet terminal 1 is smoothly broken and separated at a preset angle during the explosion of the battery core. Figure 2 , 4 -7, there is a first angle α0 between the line X3 between the endpoint P0 of the upper base of the isosceles trapezoid 21020 close to one side of the isosceles triangle 21021 and the arc vertex P5 of the isosceles triangle 21021 and the normal X4 of the aluminum sheet terminal 1. Since the axis X2 is parallel to the normal X4, the angle α0 is represented by the angle between the axis X2 and the line X3; the arcs at the connection between the first extension portion 21120 and the second extension portion 21121 are both circular arcs, and the line X5 connecting the centers of the inner side surface 01 and the outer side surface 02 is perpendicular to the aluminum sheet. There is a second angle α1 between the normal X4 of the terminal 1; the absolute value of the difference between the first angle α0 and the second angle α1 is not greater than 5°; the arc radius at the connection between the first extension portion 21120 and the second extension portion 21121 is greater than the arc curvature radius of the isosceles triangle 21021; the inner and outer side surfaces of the necking portion 2102 have a first minimum distance L1, and the inner and outer side surfaces of the first extension portion 21120 and the second extension portion 21121 have a second minimum distance L2, and the first minimum distance L1 and the second minimum distance L2 satisfy the following formula:

[0046] L1=λL2 and the value range of L2 is 1-1.5mm;

[0047] In the formula, λ is the correction coefficient, and its value range is 1-1.1;

[0048] The distance between the length L3 of the aluminum sheet terminal 1, the length L4 of the necking portion 2102 and the length L5 of the elastic portion 2112 satisfies the following formula: L3: L4: L5 = (27-29): 1: (1.4-1.6). Since the arc-shaped top surface of the isosceles triangle 21021 of the outer side surface 02 of the first plug-in portion 210 is an arc line and is subjected to pressure, it is in the final stage of crack extension. Under the action of the lever with the first plug-in portion 210 as the end point, the first extension portion 21120 and the second extension portion 21121 are stretched between the two, and the connection is easy to break. In order to ensure that it breaks outside the preset angle range, the radius of curvature of the arc-shaped connection between the first extension portion 21120 and the second extension portion 21121 is greater than the arc-shaped top surface of the isosceles triangle 21021. Secondly, the lengths of L1, L2 and the aluminum sheet terminal 1 are limited to ensure that the first plug-in portion 210 and the second plug-in portion 211 can be broken at the line X3 of the necked portion 2102 and the line X5 of the elastic portion 2112 almost simultaneously.

[0049] The above description is only an embodiment of the present application and is not intended to limit the protection scope of the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An aluminum sheet bracket for a battery module, characterized in that: include: An aluminum sheet terminal, the aluminum sheet terminal having two electrode mounting seats and two mounting portions, the aluminum sheet terminal being centrally symmetrical relative to a geometric center; A plastic bracket, wherein the plastic bracket has a through hole adapted to the outer contour of the aluminum sheet terminal, two plug-in parts are arranged in the through hole, and the two mounting parts are fixedly connected to the two plug-in parts; The two plug-in parts include a first plug-in part and a second plug-in part, the first plug-in part can swing, the second plug-in part can elastically expand and contract, and the first plug-in part and the second plug-in part are respectively arranged on opposite sides of the through hole; The first plug-in portion includes: a first base, the first base is fixedly connected to the wall surface of the through hole; A first fixing portion, wherein the first fixing portion is fixedly connected to a mounting portion of the aluminum sheet terminal; A necked portion, the necked portion being disposed between the first base and the first fixing portion; The second plug-in portion includes: a second base, the second base is fixedly connected to the side wall of the through hole; A second fixing portion, the second fixing portion being fixedly connected to another mounting portion of the aluminum sheet terminal; The elastic part is arranged between the second base and the second fixing part.

2. The aluminum sheet bracket according to claim 1, characterized in that: The cross section of the necked portion has different cutout shapes on the inner side and the outer side; The cutout of the inner side surface is in the shape of an isosceles trapezoid, and the cutout of the outer side surface is in the shape of an isosceles triangle with an arc-shaped vertex angle; The axis of the isosceles trapezoid is closer to the mounting portion of the aluminum sheet terminal than the axis of the isosceles triangle.

3. The aluminum sheet bracket according to claim 2, characterized in that: The endpoint of the upper base of the isosceles trapezoid close to one side of the isosceles triangle is intersected along the extension line of its own axis with the half side of the arc vertex angle of the isosceles triangle close to the aluminum sheet terminal mounting portion, and the arc length between the intersection point and the endpoint of the arc close to one side of the aluminum sheet terminal mounting portion is 1 / 6-1 / 8 of the total length of the arc; the endpoint of the upper base of the isosceles trapezoid away from one side of the isosceles triangle is located on the edge of the isosceles triangle along the extension line of its own axis.

4. The aluminum sheet bracket according to claim 3, characterized in that: The cross section of the elastic portion includes a first extension portion and a second extension portion having the same thickness; One end of the first extension portion is fixedly connected to the second base and extends toward the inner side surface, one end of the second extension portion is fixedly connected to the other end of the first extension portion and extends toward the outer side surface, and the other end of the second extension portion is fixedly connected to the second fixing portion.

5. The aluminum sheet bracket according to claim 4, characterized in that: The connection between the first extension portion and the second extension portion is arc-shaped, and the curvature radius of the arc line located on the inner side surface is greater than the curvature radius of the arc line on the outer side surface.

6. The aluminum sheet bracket according to claim 5, characterized in that: The angle α between the inner side surface or outer side surface of the first extension portion and the normal of the aluminum sheet terminal is smaller than the angle β between the inner side surface or outer side surface of the second extension portion and the normal of the aluminum sheet terminal, and the difference between the angle α and the angle β is between 7-10°, and the angle α satisfies: 45°≤α≤55°.

7. The aluminum sheet bracket according to claim 6, characterized in that: A first angle is formed between a line connecting an end point of the upper base of the isosceles trapezoid close to one side of the isosceles triangle and an arc vertex of the isosceles triangle and a normal direction of the aluminum sheet terminal; The arc lines at the connection between the first extension part and the second extension part are both circular arcs, and a second angle is formed between a line connecting the centers of the inner side surface and the outer side surface and the normal direction of the aluminum sheet terminal; The absolute value of the difference between the first angle and the second angle is not greater than 5°; The arc radius at the connection between the first extension portion and the second extension portion is greater than the arc curvature radius of the isosceles triangle; The inner and outer sides of the necked portion have a first minimum distance L1, and the inner and outer sides of the first extension portion and the second extension portion have a second minimum distance L2. The first minimum distance L1 and the second minimum distance L2 satisfy the following formula: L1 = λL2 and the value range of L2 is 1-1.5mm; In the formula, λ is the correction coefficient, and its value range is 1-1.1; The distances among the length L3 of the aluminum sheet terminal, the length L4 of the necked portion, and the length L5 of the elastic portion satisfy the following formula: L3: L4: L5 = (27-29): 1: (1.4-1.6).

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