Pole

Abstract

The invention relates to the technical field of battery structures, and discloses a pole, which comprises a first sub-pole, a second sub-pole, a third sub-pole, a fourth sub-pole and a fifth sub-pole, the second sub-pole post is sunken to form a mounting groove; the second metal column is inserted into the mounting groove and is welded and fixed with the second sub-pole column; the volume of the first metal column is V1, the volume of the second metal column is V2, and V2 / (V2 + V1) is more than or equal to 0.1 and less than or equal to 0.5; according to the post terminal provided by the invention, the first sub-post terminal and the second sub-post terminal are arranged, the first sub-post terminal comprises the first metal post and the second metal post, the second metal post is matched with the mounting groove and is welded and fixed with the second sub-post terminal, and meanwhile, the ratio of the volume V1 of the first metal post to the overall volume (V2 + V1) of the first sub-post terminal is selected within the range of 0.1 < = V2 / (V2 + V1) < = 0.5; on the premise of meeting the structural strength requirement of the pole, the processing process is simple and convenient, a friction welding processing mode is replaced, and the production efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of battery structures, and in particular to a pole. Background Art

[0002] The electrodes include positive electrodes and negative electrodes. The negative electrode refers to the component in the battery used to connect the negative electrode to the external circuit. Its structural design must ensure good conductivity and mechanical strength.

[0003] In the related art, in order to meet the structural strength requirements of the poles during production, friction welding is often used. However, when the poles are produced by friction welding, the workpieces, such as the aluminum rod and the base plate, rotate at a relatively high speed to generate heat, which causes the aluminum rod and the base plate to be welded together. The welding process is complicated, affecting production efficiency. Summary of the Invention

[0004] In view of this, the present invention provides a pole to solve the problem that in order to meet the structural strength requirements of the pole, the pole is often processed by friction welding, but the welding process is complicated, which affects the production efficiency.

[0005] The present invention provides a pole, comprising: a first sub-pole, comprising a first metal column and a second metal column connected to one axial end of the first metal column; a second sub-pole, having a first surface and a second surface arranged opposite to each other in the axial direction, and a mounting groove formed by a depression at the first surface; at least a portion of the second metal column is inserted into the mounting groove and welded to the second sub-pole; wherein the volume of the first metal column is V1, the volume of the second metal column is V2, and 0.1≤V2 / (V2+V1)≤0.5 is satisfied.

[0006] Beneficial effect: The pole provided in this embodiment has a simple processing process while meeting the requirements of the pole structure strength. Specifically, by setting the first sub-pole and the second sub-pole, the first sub-pole includes a first metal column and a second metal column, and the second sub-pole is provided with a mounting groove. At the same time, the second metal column cooperates with the mounting groove, and the second metal column is welded and fixed to the second sub-pole, so that the first sub-pole and the second sub-pole are combined to form a pole as a whole. The processing process is simple. At the same time, the ratio of the volume V1 of the first metal column to the overall volume of the first sub-pole (V2+V1) is selected within the range of 0.1≤V2 / (V2+V1)≤0.5 to avoid affecting the bonding strength between the first metal column and the second metal column, thereby meeting the structural strength requirements of the pole, and further replacing the friction welding processing method to improve production efficiency.

[0007] In an optional embodiment, the second metal column includes a first column and a second column; the first end of the second column along the axial direction is connected to the first column, and the second end of the second column along the axial direction is connected to the first metal column; the first column is inserted into the mounting groove, the second sub-pole surrounds the mounting groove to form the inner wall of the groove, and the outer peripheral wall of the first column is fitted with the inner wall of the groove.

[0008] Beneficial effects: By setting the second metal column as a two-section structure, the first column is inserted into the installation slot and fits against the inner wall of the slot, which can preliminarily and evenly disperse the stress during the installation process or use. At the same time, the cooperation between the first column and the installation slot can also enable the pole to be accurately positioned during the installation process, reducing installation errors while improving production efficiency; the second column can prevent the accumulated electrolyte from corroding the surface where the first metal column and the second metal column are connected, thereby effectively extending the service life of the pole and ensuring that the pole maintains stable structural strength and conductive performance during long-term use.

[0009] In an optional embodiment, the first column is radially protruded relative to the second column to form a step surface between the first column and the second column, the step surface is flush with the first surface, and the outer peripheral wall of the second column is flush with the outer peripheral wall of the first metal column.

[0010] Beneficial effects: the step surface is flush with the first surface, the axial height of the first column is the same as the depth of the mounting groove, the outer peripheral wall of the second column is flush with the outer peripheral wall of the first metal column, and the diameter of the second column is the same as the diameter of the first metal column, ensuring that the plate body and the column body of the pole are both flat plate sections or flat column sections, and the structural design of the first sub-pole and the second sub-pole is reasonable, so that after the first sub-pole and the second sub-pole are fixed together, there are no redundant protrusions on the plate body and the column body of the pole, and the pole product can be directly obtained without turning and trimming work. At the same time, the flushing of the step surface with the first surface can also enable the first column and the second sub-pole to be accurately aligned during the assembly process. Workers can judge whether the installation is in place based on whether the step surface is aligned with the first surface, thereby improving assembly efficiency and assembly accuracy, and can achieve rapid assembly without the need for complex positioning tools, further reducing production costs.

[0011] In an optional embodiment, along the axial direction, the height of the first column is H1, wherein the value range of H1 is 0.5 mm ≤ H1 ≤ 1.5 mm.

[0012] Beneficial effect: The height H1 of the first column can be in the range of 0.5mm≤H1≤1.5mm. This setting ensures that the connection strength between the first column and the second sub-pole is met while avoiding unnecessary waste; specifically, if the height of the first column is too low, such as the height H1<0.5mm, it will lead to insufficient strength of the first column, affecting the connection strength between the first column and the second sub-pole, and thus affecting the structural strength of the pole; and when the pole is press-formed, if the height of the first column is too low, it is easy to deform during forming; if the height of the first column is too high, such as the height H1>1.5mm, on the one hand, it leads to structural redundancy, the axial dimension of the first column is related to the axial depth of the mounting groove, and then to the axial height of the second sub-pole. If the height of the first column is set too high, it will affect the design of the overall structure, resulting in unnecessary material use, waste of materials, and cost impact.

[0013] In an optional embodiment, along the axial direction, the height of the second column is H2, wherein the value range of H2 is 0.1 mm≤H2≤0.5 mm.

[0014] Beneficial effect: The height H2 of the second column can be in the range of 0.1mm≤H2≤0.5mm. Such a setting can effectively prevent the electrolyte from corroding the joint surface between the second column and the first metal column, while avoiding structural redundancy and unnecessary material waste; specifically, since the electrolyte can easily penetrate into the side of the pole during use and accumulate on the step surface of the pole, if the height of the second column is too low, such as H2<0.1mm, it is easy to cause the joint surface between the second column and the first metal column to be corroded by the accumulated electrolyte, and even cause the pole to break, affecting the battery performance; if the height of the second column is too high, such as H2>0.5mm, it will lead to material waste and increase costs.

[0015] In an optional embodiment, along the axial direction, the height of the first metal column is H3, wherein the value range of H3 is 3mm≤H3≤6mm.

[0016] In an optional embodiment, the second sub-pole forms a groove bottom wall at the bottom of the mounting groove, and the axial distance between the groove bottom wall and the second surface is H4, wherein the value range of H4 is 0.5mm≤H4≤1.5mm.

[0017] Beneficial effect: The vertical spacing H4 between the bottom wall of the slot and the second surface can be in the range of 0.5mm≤H4≤1.5mm. This setting ensures that the second sub-pole has sufficient structural strength and that the plate body of the second sub-pole located at the bottom side of the bottom wall of the slot has sufficient thickness. In the subsequent battery assembly process, when the pole and the tab are welded, the second sub-pole is prevented from being penetrated by deep welding due to insufficient strength of the second sub-pole and insufficient thickness of the plate body located at the bottom side of the bottom wall of the slot. At the same time, material waste is avoided, cost increase is avoided, and a certain degree of structural redundancy is generated.

[0018] In an optional embodiment, along the radial direction, the diameter of the second cylinder is D2, wherein the value range of D2 is 3mm≤D2≤15mm; the diameter of the first cylinder is D1, satisfying 1.5mm≤(D1-D2)≤3mm.

[0019] In an optional embodiment, welding is performed at the fitting position between the outer peripheral side of the first column and the inner wall of the groove to form a weld; a first accommodating groove is recessed at a position close to the weld on the first surface; a second accommodating groove is recessed at a position close to the weld on the step surface, and the second accommodating groove is connected to the first accommodating groove.

[0020] Beneficial effect: By respectively arranging the first accommodating groove and the second accommodating groove at positions close to the weld on the first surface and the step surface, the first accommodating groove corresponds to and communicates with the second accommodating groove, forming a space for accommodating the weld mark. The weld mark formed during welding can be correspondingly located in the above-mentioned space, effectively avoiding the weld mark from protruding relative to the first surface and the step surface, avoiding the weld mark from affecting the pole structure, and further avoiding the weld mark from interfering with the subsequent assembly of the pole and other components.

[0021] In an optional embodiment, a first joint surface is formed at the connection position between the first metal column and the second metal column, and at least a portion of the wall of the first joint surface is protruding and / or recessed; a second joint surface is formed at the connection position between the second metal column and the first metal column, and at least a portion of the wall of the second joint surface is protruding and / or recessed; the shape of the second joint surface is adapted to that of the first joint surface. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0023] Figure 1is a schematic diagram of the first sub-pole of the present invention;

[0024] Figure 2 is a schematic diagram of the second sub-pole of the present invention;

[0025] Figure 3 It is a cross-sectional schematic diagram of the first sub-pole and the second sub-pole matched together according to the present invention;

[0026] Figure 4 Exploded view of the first sub-pole and the second sub-pole of the present invention;

[0027] Figure 5 This is a schematic diagram of the structure of the first sub-pole and the second sub-pole in cooperation with each other according to the present invention;

[0028] Figure 6 is a schematic diagram of a first joint surface and a second joint surface according to an embodiment of the present invention;

[0029] Figure 7 is a schematic diagram of a first joint surface and a second joint surface according to another embodiment of the present invention;

[0030] Figure 8 is a schematic diagram of a first joint surface and a second joint surface according to yet another embodiment of the present invention;

[0031] Figure 9 For the present invention Figure 8 Exploded view of the first sub-pole in the embodiment.

[0032] Description of reference numerals:

[0033] 1. First sub-pole; 11. First metal column; 111. First joint surface; 12. Second metal column; 121. First column; 122. Second column; 123. Step surface; 124. Second accommodating groove; 125. Second joint surface; 2. Second sub-pole; 21. First surface; 211. Mounting groove; 212. First accommodating groove; 22. Second surface; 23. Inner wall of groove; 24. Bottom wall of groove; 3. Weld DETAILED DESCRIPTION

[0034] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying 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. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of the present invention.

[0035] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0036] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0037] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0038] The following combination Figures 1 to 9 , describing embodiments of the present invention.

[0039] According to an embodiment of the present invention, a pole is provided, comprising: a first sub-pole 1, comprising a first metal column 11 and a second metal column 12 connected to one axial end of the first metal column 11; a second sub-pole 2, having a first surface 21 and a second surface 22 arranged opposite to each other in the axial direction, and a mounting groove 211 recessed at the first surface 21; at least a portion of the second metal column 12 is inserted into the mounting groove 211 and is welded to the second sub-pole 2; wherein the volume of the first metal column 11 is V1, the volume of the second metal column 12 is V2, and 0.1≤V2 / (V2+V1)≤0.5 is satisfied.

[0040] It should be noted that the electrode can be but is not limited to a negative electrode.

[0041] Specifically, the metal materials of the first metal column 11 and the second metal column 12 are different, and the metal material of the second metal column 12 and the second sub-pole 2 is the same; wherein, the first metal column 11 can be metal aluminum, and the second metal column 12 and the second sub-pole 2 are metal copper; such an arrangement ensures that the second metal column 12 and the second sub-pole 2 can be smoothly welded and fixed.

[0042] Furthermore, since the first sub-pole 1 includes a first metal column 11 and a second metal column 12, the first sub-pole 1 can be formed by pressing a copper-aluminum composite plate; the second sub-pole 2 can be formed by stamping; both the first sub-pole 1 and the second sub-pole 2 can be obtained directly by molding without the need for additional processing such as turning.

[0043] Furthermore, in the first sub-pole 1, the ratio of the volume of the second metal column 12 to the overall volume of the first sub-pole 1 affects the bonding strength between the first metal column 11 and the second metal column 12; in this embodiment, the ratio of the volume V2 of the second metal column 12 to the overall volume (V2+V1) of the first sub-pole 1 is selected within the range of 0.1≤V2 / (V2+V1)≤0.5, thereby ensuring that the bonding strength between the first metal column 11 and the second metal column 12 is always excellent, thereby ensuring that the structural strength of the pole meets the requirements.

[0044] On the one hand, if the proportion of the second metal column 12 relative to the overall first sub-pole 1 is too high, such as higher than 50%, that is, V2 / (V2+V1)>0.5, during the pier forming and subsequent use process, since the second metal column 12 is a metal copper material and the first metal column 11 is a metal aluminum material, first of all, the physical properties of the metal copper and the metal aluminum are different, such as different thermal expansion coefficients. Due to temperature changes, the first metal column 11 and the second metal column 12 expand and contract. Since the proportion of the second metal column 12 is large, a large internal stress is generated at the copper-aluminum interface. The large internal stress will cause cracks at the copper-aluminum interface, thereby greatly weakening the bonding strength between the first metal column 11 and the second metal column 12; and if the proportion of the second metal column 12 relative to the overall first sub-pole 1 exceeds 50%, the thickness of the copper layer in the copper-aluminum composite plate used in the pier forming is too large, affecting the bonding strength between the copper layer and the aluminum layer in the composite plate, and then affecting the bonding strength between the first metal column 11 and the second metal column 12.

[0045] On the other hand, the ratio of the volume of the second metal column 12 to the overall volume of the first sub-pole 1 cannot be too small. If the proportion of the second metal column 12 relative to the overall first sub-pole 1 is less than 10%, that is, V2 / (V2+V1)<0.1, during the pier forming process, due to the small volume proportion of the second metal column 12, the bearing capacity of the second metal column 12 is weak, and it is easy to generate a large number of cracks at the second metal column 12, thereby affecting the bonding effect between the first metal column 11 and the second metal column 12; and if the proportion of the second metal column 12 relative to the overall first sub-pole 1 is less than 10%, the thickness of the copper layer in the copper-aluminum composite plate used in the pier forming is too thin, affecting the bonding strength between the copper layer and the aluminum layer in the composite plate, thereby affecting the bonding strength between the first metal column 11 and the second metal column 12.

[0046] The pole provided in this embodiment has a simple processing process while meeting the requirements for pole structural strength. Specifically, by providing a first sub-pole 1 and a second sub-pole 2, the first sub-pole 1 includes a first metal column 11 and a second metal column 12, and a mounting groove 211 is provided at the second sub-pole 2. At the same time, the second metal column 12 cooperates with the mounting groove 211, and the second metal column 12 is welded and fixed to the second sub-pole 2, so that the first sub-pole 1 and the second sub-pole 2 are combined to form a pole as a whole. The processing process is simple. At the same time, the ratio of the volume V1 of the first metal column 11 to the overall volume of the first sub-pole 1 (V2+V1) is selected within the range of 0.1≤V2 / (V2+V1)≤0.5 to avoid affecting the bonding strength between the first metal column 11 and the second metal column 12, thereby meeting the structural strength requirements of the pole, and further replacing the friction welding processing method to improve production efficiency.

[0047] Optional, combined Figure 5 As shown, in this embodiment, the shape of the first metal column 11 is a cylinder. In other embodiments, the shape of the first metal column 11 can also be, but not limited to, other shapes such as a prism, which can be determined according to different usage requirements in actual situations.

[0048] In some embodiments, combined Figure 1 As shown, the second metal column 12 includes a first column 121 and a second column 122; the first end of the second column 122 along the axial direction is connected to the first column 121, and the second end of the second column 122 along the axial direction is connected to the first metal column 11; the first column 121 is inserted into the mounting groove 211, and the second sub-pole 2 surrounds the mounting groove 211 to form a groove inner wall 23, and the outer peripheral wall of the first column 121 is fitted with the groove inner wall 23.

[0049] Specifically, the second metal column 12 is composed of two sections, a first column 121 and a second column 122. The first column 121 is connected to the second sub-pole 2, and the second column 122 is connected to the first metal column 11; wherein the first column 121 is inserted into the mounting groove 211, and the outer peripheral side of the first column 121 is fitted with the inner wall 23 of the groove. The first column 121 is welded and fixed to the second sub-pole 2, so that the first sub-pole 1 and the second sub-pole 2 are well fixed; the first end of the second column 122 along the axial direction is connected to the first column 121, and the second The second end of the column 122 along the axial direction is connected to the first metal column 11, so that there is a certain distance between the surface where the second column 122 is connected to the first metal column 11 and the second surface 22. The distance value is the height value of the second column 122 along the axial direction. Since the electrolyte can easily penetrate into the side of the pole during use and accumulate at the plate part of the pole (the matching structure of the first column 121 and the second sub-pole 2), the second column 122 can prevent the accumulated electrolyte from corroding the surface where the first metal column 11 and the second metal column 12 are connected.

[0050] In this embodiment, by setting the second metal column 12 as a two-section structure, the first column 121 and the second column 122 are respectively connected to the first metal column 11 and the second sub-pole 2, and at the same time, the first column 121 is inserted into the installation groove 211 and fits against the inner wall 23 of the groove, which can preliminarily and evenly disperse the stress during the installation process or use. At the same time, the cooperation between the first column 121 and the installation groove 211 can also enable the pole to be accurately positioned during the installation process, reducing installation errors and improving production efficiency; the second column 122 can prevent the accumulated electrolyte from corroding the surface where the first metal column 11 and the second metal column 12 are connected, thereby effectively extending the service life of the pole and ensuring that the pole maintains stable structural strength and conductive performance during long-term use.

[0051] In some embodiments, combined Figure 1 As shown, the first column 121 is radially protruded relative to the second column 122 to form a step surface 123 between the first column 121 and the second column 122. The step surface 123 is flush with the first surface 21, and the outer peripheral wall of the second column 122 is flush with the outer peripheral wall of the first metal column 11.

[0052] Specifically, the step surface 123 is flush with the first surface 21, the axial height of the first column 121 is the same as the depth of the mounting groove 211, the outer peripheral wall of the second column 122 is flush with the outer peripheral wall of the first metal column 11, and the diameter of the second column 122 is the same as the diameter of the first metal column 11, ensuring that the plate body and the column body of the pole (the matching structure of the second column 122 and the first metal column 11) are both flat plate segments or flat column segments, and the structural design of the first sub-pole 1 and the second sub-pole 2 is reasonable, so that the first sub-pole After the column 1 and the second sub-pole 2 are fixed together, there are no unnecessary protrusions on the plate body and the column body of the pole, and the pole product can be directly obtained without turning and trimming work. At the same time, the step surface 123 is flush with the first surface 21, which can also enable the first column 121 and the second sub-pole 2 to be accurately aligned during the assembly process. Workers can judge whether the installation is in place based on whether the step surface 123 is aligned with the first surface 21, thereby improving assembly efficiency and assembly accuracy, and can achieve rapid assembly without the need for complex positioning tools, further reducing production costs.

[0053] In some embodiments, combined Figure 3 As shown, along the axial direction, the height of the first column 121 is H1, wherein the value range of H1 is 0.5mm≤H1≤1.5mm.

[0054] Specifically, in the axial direction, the height H1 of the first column 121 can be in the range of 0.5 mm ≤ H1 ≤ 1.5 mm. This setting ensures that the connection strength between the first column 121 and the second sub-pole 2 is met while avoiding unnecessary waste. Specifically, if the height of the first column 121 is too low, such as the height H1 < 0.5 mm, the strength of the first column 121 will be insufficient, affecting the connection strength between the first column 121 and the second sub-pole 2, thereby affecting the structural strength of the pole. Moreover, when the pole is press-formed, if the height of the first column 121 is too low, it is easy to deform during forming. If the height of the first column 121 is too high, such as the height H1 > 1.5 mm, on the one hand, it leads to structural redundancy. The axial dimension of the first column 121 is related to the axial depth of the mounting groove 211, and further to the axial height of the second sub-pole 2. If the height of the first column 121 is set too high, it will affect the design of the overall structure, resulting in unnecessary material consumption, waste of materials, and cost impact.

[0055] Optionally, the value of the height H1 can be any value among 0.5 mm, 0.7 mm, 0.8 mm, 1 mm, 1.2 mm, 1.4 mm, 1.5 mm, etc., or a value between any two values.

[0056] In some embodiments, combined Figure 3 As shown, along the axial direction, the height of the second column 122 is H2, wherein the value range of H2 is 0.1mm≤H2≤0.5mm.

[0057] Specifically, the height H2 of the second column 122 can be in the range of 0.1mm≤H2≤0.5mm. Such a setting can effectively prevent the electrolyte from corroding the joint surface between the second column 122 and the first metal column 11, while avoiding structural redundancy and unnecessary material waste; specifically, since the electrolyte can easily penetrate into the side of the pole during use and accumulate on the step surface 123 of the pole, if the height of the second column 122 is too low, such as H2<0.1mm, it is easy to cause the joint surface between the second column 122 and the first metal column 11 to be corroded by the accumulated electrolyte, and even cause the pole to break, affecting the battery performance; if the height of the second column 122 is too high, such as H2>0.5mm, it will cause material waste and increase costs.

[0058] Optionally, the value of the spacing H24 can be any value among 0.1 mm, 0.11 mm, 0.24 mm, 0.37 mm, 0.4 mm, 0.49 mm, 0.5 mm, etc., or a value between any two values.

[0059] In some embodiments, combined Figure 3 As shown, along the axial direction, the height of the first metal pillar 11 is H3, wherein the value range of H3 is 3mm≤H3≤6mm.

[0060] Specifically, the height H3 of the first metal post 11 is in the range of 3mm≤H3≤6mm. This setting ensures that the column portion of the pole has sufficient height to meet the use requirements, and prevents the height of the column portion of the pole from being too small due to the height of the first metal post 11 being too small, affecting the assembly of the pole with other components, and affecting the structural strength of the pole; on the other hand, it avoids the height of the first metal post 11 being too high, which makes the column portion of the pole too high, resulting in stress concentration at the bottom end of the column portion close to the plate portion when the column portion is subjected to force, causing local stress overload and even leading to defects such as pole breakage.

[0061] In some embodiments, combined Figure 3 As shown, the second sub-pole 2 is formed with a groove bottom wall 24 at the bottom of the mounting groove 211 , and the axial distance between the groove bottom wall 24 and the second surface 22 is H4, wherein the value range of H4 is 0.5mm≤H4≤1.5mm.

[0062] Specifically, along the axial direction, the vertical spacing H4 between the bottom wall 24 of the slot and the second surface 22 can be in the range of 0.5mm≤H4≤1.5mm. This setting ensures that the second sub-pole 2 has sufficient structural strength, and ensures that the plate body of the second sub-pole 2 located at the bottom side of the bottom wall 24 of the slot has sufficient thickness. In the subsequent battery assembly process, when the pole and the pole ear are welded, the second sub-pole 2 is prevented from being penetrated by deep welding due to insufficient strength of the second sub-pole 2 and insufficient thickness of the plate body located at the bottom side of the bottom wall 24 of the slot, while avoiding material waste, increasing costs, and generating a certain degree of redundancy in the structure.

[0063] Optionally, the value of the interval H4 can be any value among 0.5 mm, 0.7 mm, 0.8 mm, 1 mm, 1.2 mm, 1.4 mm, 1.5 mm, etc., or a value between any two values.

[0064] In some embodiments, combined Figure 3 As shown, along the radial direction, the diameter of the second column 122 is D2, wherein the value range of D2 is 3mm≤D2≤15mm; the diameter of the first column 121 is D1, satisfying 1.5mm≤(D1-D2)≤3mm.

[0065] Specifically, along the radial direction, the diameter D2 of the second column 122 can be in the range of 3mm≤D2≤15mm. With this setting, since the diameter of the second column 122 is the same as the diameter of the first metal column 11, on the one hand, it ensures that the column part of the pole has sufficient structural strength to prevent deformation or breakage due to external force during use; on the other hand, it avoids material waste caused by excessive diameter.

[0066] Specifically, the difference (D1-D2) between the diameter D1 of the first cylinder 121 and the diameter D2 of the second cylinder 122 also corresponds to the size of the protruding portion of the first cylinder 121 relative to the second cylinder 122 in the radial direction. The value range of the difference (D1-D2) is 1.5mm≤(D1-D2)≤3mm. This setting, on the one hand, ensures that the pole has good structural strength and ensures a smooth welding process, and on the other hand, avoids unnecessary waste of materials.

[0067] Optionally, the diameter D1 of the first column 121 may be any value among 3 mm, 3.1 mm, 6 mm, 8.8 mm, 10 mm, 14 mm, 14.9 mm, 15 mm, etc., or a value between any two values.

[0068] Specifically, since the first column 121 is inserted into the installation groove 211 and fits against the inner wall 23 of the groove, the first column 121 can initially and evenly disperse the stress during the installation process or use. If the difference (D1-D2) is too small, such as the difference (D1-D2) <1.5mm, the diameter of the first column 121 is too small, and it is difficult to effectively disperse the stress during installation or use, affecting the structural strength of the pole. In addition, if the difference (D1-D2) is too small, it will also cause the first column 121 to be relatively The protruding part of the second column 122 is too small. When welding, a clamping tool such as a protective cover is required to be set to press on the step surface 123 of the first column 121. If the protruding part of the first column 121 relative to the second column 122 is too small, it will affect the setting position of the clamping tool, resulting in no placement space for the clamping tool. The clamping tool is an existing component and will not be described here. If the difference (D1-D2) is too large, such as the difference (D1-D2)>3mm, unnecessary material waste will occur, increasing costs.

[0069] Optionally, the difference (D1-D2) may be any value of 1.5 mm, 1.6 mm, 1.8 mm, 1.9 mm, 2.3 mm, 2.9 mm, 3 mm, etc., or a value between any two values.

[0070] In some embodiments, combined Figure 3 As shown, the outer peripheral side of the first column 121 and the inner wall 23 of the groove are welded at the fitting position to form a weld 3; the first surface 21 is recessed with a first accommodating groove 212 at a position close to the weld 3; the step surface 123 is recessed with a second accommodating groove 124 at a position close to the weld 3, and the second accommodating groove 124 is connected to the first accommodating groove 212.

[0071] Specifically, the purpose of setting the first accommodating groove 212 and the second accommodating groove 124 is to accommodate weld marks. Weld marks refer to excess deposits formed at the welding interface after the solder solidifies during welding. By respectively setting the first accommodating groove 212 and the second accommodating groove 124 at positions close to the weld 3 on the first surface 21 and the step surface 123, the first accommodating groove 212 and the second accommodating groove 124 correspond to and communicate with each other, forming a space for accommodating weld marks. The weld marks formed during welding can be correspondingly located in the above-mentioned space, effectively avoiding the weld marks from protruding relative to the first surface 21 and the step surface 123, avoiding the weld marks from affecting the pole structure, and further avoiding the weld marks from interfering with the subsequent assembly of the pole and other components.

[0072] In some embodiments, combined Figures 6 to 9 As shown, the first metal column 11 forms a first joint surface 111 at the connection position with the second metal column 12, and at least part of the wall of the first joint surface 111 is convex and / or concave; the second metal column 12 forms a second joint surface 125 at the connection position with the first metal column 11, and at least part of the wall of the second joint surface 125 is convex and / or concave; the second joint surface 125 is adapted to the shape of the first joint surface 111.

[0073] In one embodiment, combined Figure 6 As shown, the wall of the first joint surface 111 is convex toward the side close to the second metal column 12, and the shape of the first joint surface 111 can be but not limited to an arc; the wall of the second joint surface 125 is concave toward the side away from the first metal column 11, and the shape of the second joint surface 125 can be but not limited to an arc; the shapes of the first joint surface 111 and the second joint surface 125 are matched, and the first joint surface 111 and the second joint surface 125 are fitted together, thereby increasing the contact area between the first metal column 11 and the second metal column 12, and can also disperse the stress applied to the pole during use, thereby improving the connection strength and stability between the first metal column 11 and the second metal column 12, and ensuring that the pole still maintains good performance during long-term use.

[0074] In one embodiment, combined Figure 7 As shown, compared with the previous embodiment, in this embodiment, the wall of the first bonding surface 111 is recessed toward the side away from the second metal column 12, and the wall of the second bonding surface 125 is convex toward the side close to the first metal column 11. The shapes of the first bonding surface 111 and the second bonding surface 125 can be, but not limited to, arc-shaped; wherein, the shapes of the first bonding surface 111 and the second bonding surface 125 match, and the first bonding surface 111 and the second bonding surface 125 are fitted together, so as to achieve the effect of improving the connection strength and stability between the first metal column 11 and the second metal column 12.

[0075] In another embodiment, combined Figure 8 and Figure 9 As shown, the wall of the first joint surface 111 is recessed toward the side away from the second metal column 12, and the wall of the second joint surface 125 is protruded toward the side close to the first metal column 11. Compared with the previous embodiment, in this embodiment, the recessed depth of part of the wall of the first joint surface 111 is larger, so as to form a local recess at the first joint surface 111, and the protruding height of part of the wall of the second joint surface 125 is larger, so as to form a local protrusion at the second joint surface 125. The two are interlocked with each other to further increase the contact area, thereby achieving the effect of improving the connection strength and stability between the first metal column 11 and the second metal column 12; at the same time, the relative movement of the first metal column 11 and the second metal column 12 is limited by means of the geometric shape, thereby effectively improving the tensile strength and shear resistance of the pole.

[0076] Optionally, there is no limit on the number and position of the local depressions and local protrusions, as long as the overall shapes of the first joint surface 111 and the second joint surface 125 are matched, so that the first joint surface 111 and the second joint surface 125 are fitted together.

[0077] The specific production process of the pole is as follows: the copper-aluminum composite plate is press-formed to obtain the first sub-pole 1, and the metal copper material is stamped to obtain the second sub-pole 2; the second column 122 of the second metal part of the first sub-pole 1 is inserted into the installation groove 211 of the second sub-pole 2, and welded at the position where the outer peripheral side of the second column 122 and the inner wall 23 of the groove are in contact; before welding, a first accommodating groove 212 is provided on the first surface 21 near the position to be welded, and a second accommodating groove 124 is provided on the step surface 123 near the position to be welded; laser welding is performed to fix the first column 121 and the second sub-pole 2, and then the first sub-pole 1 and the second sub-pole 2 are fixed to obtain the pole; the first accommodating groove 212 and the second accommodating groove 124 accommodate the weld marks generated during the welding process.

[0078] Furthermore, the ratio of the volume V2 of the second metal pillar 12 to the overall volume (V2+V1) of the first sub-pole 1 is selected within the range of 0.1≤V2 / (V2+V1)≤0.5, where V1 is the volume of the first metal pillar 11. Since the second pillar 122 has the same diameter as the first metal pillar 11, V1 can be calculated using the height H3 of the first metal pillar 11 and the diameter D2 of the second pillar 122, i.e., V1=π×(D2 / 2). 2 × H3; V2 is calculated by the height H1 of the first column 121, the diameter D1 of the first column 121, and the height H2 of the second column 122, the diameter D2 of the second column 122, that is, V2 = π × (D1 / 2) 2 ×H1+π×(D2 / 2) 2 ×H2.

[0079] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Although the embodiments of the present invention have been described with reference to the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the present invention.

Claims

1. A pole, characterized in that: include: A first sub-pole, comprising a first metal column and a second metal column connected to one axial end of the first metal column; The second sub-pole has a first surface and a second surface arranged opposite to each other in the axial direction, and the first surface is recessed to form a mounting groove; at least a portion of the second metal column is inserted into the mounting groove and is welded to the second sub-pole; The volume of the first metal column is V1, the volume of the second metal column is V2, and 0.1≤V2 / (V2+V1)≤0.5 is satisfied.

2. The pole according to claim 1, characterized in that The second metal column includes a first column and a second column; A first end of the second column along the axial direction is connected to the first column, and a second end of the second column along the axial direction is connected to the first metal column; The first column is inserted into the installation slot, the second sub-pole surrounds the installation slot to form an inner wall of the slot, and the outer peripheral wall of the first column is fitted with the inner wall of the slot.

3. The pole according to claim 2, characterized in that The first column is radially protruded relative to the second column to form a step surface between the first column and the second column. The step surface is flush with the first surface, and the outer peripheral wall of the second column is flush with the outer peripheral wall of the first metal column.

4. The pole according to claim 3, characterized in that Along the axial direction, the height of the first column is H1, wherein the value range of H1 is 0.5 mm ≤ H1 ≤ 1.5 mm.

5. The pole according to claim 3, characterized in that: Along the axial direction, the height of the second column is H2, wherein the value range of H2 is 0.1mm≤H2≤0.5mm.

6. The pole according to any one of claims 3 to 5, characterized in that: Along the axial direction, the height of the first metal column is H3, wherein the value range of H3 is 3mm≤H3≤6mm.

7. The pole according to claim 6, characterized in that The second sub-pole has a bottom wall formed at the bottom of the mounting groove, and the axial distance between the bottom wall and the second surface is H4, wherein the value range of H4 is 0.5mm≤H4≤1.5mm.

8. The pole according to claim 7, characterized in that In the radial direction, the diameter of the second cylinder is D2, wherein the value range of D2 is 3mm≤D2≤15mm; The diameter of the first column is D1, which satisfies 1.5 mm ≤ (D1 - D2) ≤ 3 mm.

9. The pole according to claim 8, characterized in that Welding is performed at the fitting position between the outer circumference of the first column and the inner wall of the groove to form a weld; The first surface is recessed at a position close to the weld to form a first receiving groove; The step surface is recessed at a position close to the weld to form a second accommodating groove, and the second accommodating groove is correspondingly connected to the first accommodating groove.

10. The pole according to claim 1, characterized in that A first joint surface is formed at the joint position between the first metal column and the second metal column, and at least a portion of the wall of the first joint surface is convex and / or concave; A second joint surface is formed at the second metal column at the joint position with the first metal column, and at least a portion of the wall of the second joint surface is convex and / or concave.

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