Battery pole structure forming method and battery pole structure

Abstract

The embodiment of the invention discloses a battery pole structure forming method and a battery pole structure. The battery pole structure forming method comprises the steps that a bar is obtained; upsetting or extruding the bar to obtain a blank; the blank comprises a first end and a second end, and the section size of the first end is larger than that of the second end; upsetting the blank along a first direction to obtain a preformed piece of which the first end forms a pole body part of a columnar structure and the second end and / or the first end forms an adapter body part of a sheet structure; the first direction is perpendicular to the direction from the first end to the second end; and shaping and / or finely cutting the preformed part to obtain a finished part. The process disclosed by the invention is simple, the pole and the adapter sheet which are integrally formed are manufactured, and the pole and the adapter sheet do not need to be welded.

Description

Technical Field

[0001] The present invention relates to the technical field of new energy batteries, and in particular to a battery pole structure forming method and a battery pole structure. Background Art

[0002] In the manufacturing of new energy batteries, the formation of the pole and the adapter is one of the key steps. In the existing technology, there are many methods that can be used for the formation of the pole and the adapter.

[0003] A common method is to independently form the pole body and the adapter and then weld them together. This method has a high welding and installation failure rate, a complex pole forming method, high welding flatness requirements, and low material utilization.

[0004] Another common method is to use CNC (computer numerical control) and other machining methods to perform the forming process of battery poles and adapters. The material utilization rate is low, and the processing cost and processing time are long.

[0005] In summary, there are a variety of methods in the prior art that can be used to form battery poles and adapters, but they all have the problems of low material utilization, high processing costs, and long processing time. Summary of the Invention

[0006] Based on this, it is necessary to address the above problems and propose a battery pole structure forming method and a battery pole structure.

[0007] A method for forming a battery pole structure, comprising the following steps:

[0008] Get the bar stock;

[0009] Upsetting or extruding the bar to obtain a blank; the blank comprises a first end and a second end, and a cross-sectional dimension of the first end is greater than a cross-sectional dimension of the second end;

[0010] The blank is upset along a first direction to obtain a preform having a pole body portion with a columnar structure formed at the first end and a transfer plate body portion with a sheet structure formed at the second end; the first direction is perpendicular to a direction from the first end to the second end;

[0011] The preform is shaped and / or finely cut to obtain a finished product.

[0012] In the above solution, the step of upsetting the bar to obtain a blank includes:

[0013] The end of the bar is upset along a second direction to obtain a blank having a first end upset to a preset cross-sectional size and a second end having a cross-sectional size identical to that of the bar; the second direction is parallel to or coincides with a direction from the first end to the second end.

[0014] In the above solution, the step of upsetting the end of the bar along the second direction includes:

[0015] The first end of the blank is upset to a preset cross-sectional size by at least two times, and the upsetting length of the first end in the second direction during each upsetting is not greater than the width dimension value of the second end in the first direction; the first direction and the second direction are perpendicular to each other.

[0016] In the above scheme, when the bar is upset at least twice along the second direction, the length of the first end of the blank along the first direction is upset to a first value, the length along the second direction is upset to a second value, and the length along the third direction is upset to a third value; the third value is greater than the first value, the first value is equal to the width dimension value of the bar in the first direction, and the third direction is perpendicular to the first direction.

[0017] In the above solution, the step of extruding the bar material to obtain the blank comprises:

[0018] The side wall of one end of the bar is extruded in a direction perpendicular to the second direction to obtain a blank whose second end is extruded to a preset cross-sectional size and whose cross-sectional size at the first end is the same as the cross-sectional size of the bar; the second direction is parallel to or coincides with the direction from the first end to the second end.

[0019] In the above scheme, when the side wall of one end of the rod is extruded in a direction perpendicular to the second direction, the length of the second end of the billet along the first direction and the third direction is extruded to a fourth value, and the length along the second direction is extruded to a fifth value; the fourth value is equal to the width dimension value of the first end in the first direction; the sum of the fifth value and the length dimension value of the first end in the second direction is greater than the length dimension value of the rod in the second direction.

[0020] In the above solution, the step of extruding the bar material to obtain the blank comprises:

[0021] The rod material is extruded into a blank including a first end and a second end by an extrusion molding device; wherein the first end and the second end are extruded to a preset cross-sectional size.

[0022] In the above scheme, the step of upsetting the blank along the first direction to obtain a preformed part in which the first end forms a pole body part with a columnar structure and the second end and / or the first end form a adapter body part with a sheet structure includes: placing the blank at a preset position in the cavity of a first forming mold, the opening and closing directions of the first forming mold are the same as the first direction, and the first forming mold is closed so that the first end is upset to form a pole body part with a columnar structure, and the first end and the second end are simultaneously thinned to form a adapter body part with a sheet structure, so as to obtain a preformed part in which the pole body part and the adapter body part are perpendicular to each other.

[0023] In the above scheme, when the first molding mold is closed, the first end and the second end extend and become thinner along the second direction and the third direction to form the adapter plate main body; the extension amount of the first end and the second end in the second direction is less than the extension amount in the third direction; any two directions among the first direction, the second direction and the third direction are perpendicular to each other.

[0024] In the above solution, when the first molding die is closed, a first step is formed on the back of the first end; a second step is formed at the connection between the first end and the second end, and the volume of the first step is at least twice the volume of the second step.

[0025] In the above solution, the step of shaping the preform to obtain a finished product includes:

[0026] The preform is placed in the cavity of the second molding die, and the cavity of the second molding die is provided with a groove portion and a protrusion portion, and the groove portion is used to adapt to the pole body portion; when the mold is closed, the material of the first step is squeezed and filled to the second step, and the adapter body portion forms a connecting groove for placing the pole ear through the protrusion portion.

[0027] A battery pole structure is provided, which adopts the battery pole structure forming method described in any one of the above schemes to form an integrally formed pole and adapter.

[0028] By adopting the embodiment of the present invention, the process of the present invention is simple, and the pole and adapter are made into an integrally formed piece, and no welding is required between the pole and the adapter, which can improve material utilization, reduce processing costs, shorten processing time, strengthen the structure, and reduce installation processes. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. 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 paying any creative work.

[0030] in:

[0031] Figure 1 A flowchart of a method for forming a battery pole structure is provided for Example 1 of the present invention;

[0032] Figure 2 A schematic diagram of the structure after initial upsetting in a method for forming a battery pole structure is provided for embodiment 1 of the present invention;

[0033] Figure 3 for Figure 2 Middle AA section view;

[0034] Figure 4 A schematic structural diagram of a battery pole structure after final upsetting in a method for forming the battery pole structure is provided for embodiment 1 of the present invention;

[0035] Figure 5 for Figure 4 Middle BB section view;

[0036] Figure 6 A schematic structural diagram of a preformed part after upsetting the blank along a first direction in a method for forming a battery pole structure is provided for embodiment 1 of the present invention;

[0037] Figure 7 for Figure 6 Middle CC section view;

[0038] Figure 8 A cross-sectional view of a preformed part after shaping in a battery pole structure forming method according to Example 1 of the present invention is provided;

[0039] Figure 9 A schematic structural diagram of a preformed part after rough cutting in a method for forming a battery pole structure is provided for embodiment 1 of the present invention;

[0040] Figure 10 for Figure 9 Middle DD section view;

[0041] Figure 11 A schematic structural diagram of a preformed part after forming in a method for forming a battery pole structure is provided for embodiment 1 of the present invention;

[0042] Figure 12 for Figure 11 Middle EE section view;

[0043] Figure 13 A schematic structural diagram of a preformed part after precision cutting in a method for forming a battery pole structure is provided for embodiment 1 of the present invention;

[0044] Figure 14 for Figure 13 Middle FF section view;

[0045] Figure 15 A flowchart of a method for forming a battery pole structure is provided for embodiment 2 of the present invention;

[0046] Figure 16 A schematic diagram of the structure of a battery pole after extrusion in a method for forming a battery pole structure is provided for embodiment 2 of the present invention;

[0047] Figure 17 for Figure 16 Middle GG section view;

[0048] Figure 18 A flowchart of a battery pole structure forming method is provided for Example 3 of the present invention.

[0049] Figure 19 A schematic diagram of a blank after extrusion molding in a battery pole structure molding method according to Example 3 of the present invention is provided. DETAILED DESCRIPTION

[0050] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0051] An embodiment of the present invention provides a method for forming a battery pole structure, which comprises obtaining a rod material; upsetting or extruding the rod material to obtain a blank; the blank material comprises a first end and a second end, and the cross-sectional dimension of the first end is larger than the cross-sectional dimension of the second end; upsetting the blank material along a first direction to obtain a preformed part in which the first end forms a pole body portion with a columnar structure and the second end and / or the first end forms a adapter body portion with a sheet structure; the first direction is perpendicular to the direction from the first end to the second end; shaping and / or precision cutting the preformed part to obtain a finished part, thereby making an integrally formed pole and adapter plate, and no welding is required between the pole and the adapter plate, which can improve material utilization, reduce processing costs, shorten processing time, strengthen the structure, and reduce installation processes.

[0052] In the present invention, the cross-sectional dimension refers to the external dimension value at the cross section when the bar or billet is cut along the first direction.

[0053] Embodiment 1 of the present invention provides a method for forming a battery pole structure, such as Figure 1 As shown, the method is implemented by the following steps:

[0054] Step 101: Obtain bar material;

[0055] Specifically, the rod material has an elongated shape.

[0056] In this embodiment, the rod material may be a copper rod or an aluminum rod with a circular, elliptical or polygonal structure.

[0057] Step 102: Upsetting the bar to obtain a blank; the blank includes a first end 1 and a second end 2, and the cross-sectional dimension of the first end 1 is larger than the cross-sectional dimension of the second end 2;

[0058] Specifically, the bar is upset along the second direction to obtain a blank having a first end 1 upset to a preset cross-sectional size and a second end 2 having a cross-sectional size identical to that of the bar.

[0059] The first end 1 is upset to a preset cross-sectional size so that material sufficient to form the pole is upset to the first end 1 to avoid insufficient material at the pole.

[0060] The length of the second end 2 itself in the second direction is much greater than the length in the third direction or the second direction, so as to form a rectangular adapter piece respectively; at the same time, when upsetting along the first direction, the material flows along the second direction and the third direction, and the flow amount in the third direction is greater than the flow amount in the second direction, so as to form a rectangular sheet material, which is easier to form into a sheet.

[0061] The first end 1 of the blank is upset to a preset cross-sectional size through at least two upsets, and the upset length of the first end 1 in the second direction after each upset is not greater than the width dimension value of the second end 2 in the first direction; the second direction is parallel to or coincides with the direction from the first end 1 to the second end 2.

[0062] The length of each upsetting of the first end 1 in the second direction is not greater than the width dimension of the second end 2 in the first direction, which can make the material flow evenly and avoid the situation where the upsetting length is too long at one time, causing the material to flow only to one side and affecting the subsequent forming quality or making it impossible to proceed with the subsequent forming.

[0063] The first direction is perpendicular to the direction from the first end 1 to the second end 2 , and the second direction is parallel to or coincides with the direction from the first end 1 to the second end 2 .

[0064] When the bar is upset at least twice along the second direction, the length of the first end 1 of the blank along the first direction is upset to a first value, the length along the second direction is upset to a second value, and the length along the third direction is upset to a third value; the third value is greater than the first value, the first value is equal to the width dimension value of the bar in the first direction, and the third direction is perpendicular to the first direction.

[0065] After such upsetting, the material at the first end 1 flows laterally along the third direction, thereby obtaining a first end of the blank with an elliptical cross-sectional shape or a waist-shaped cross-sectional shape that is flat along the first direction and arc-shaped along the third direction, so that the flow of material in the subsequent upsetting step is smoother and more convenient.

[0066] In some embodiments, the process of obtaining a blank by upsetting the cylindrical bar twice is taken as an example for description.

[0067] like Figure 2 、 3 As shown in the figure, the Z-axis direction is the first direction, the Y-axis direction is the second direction, and the X-axis direction is the third direction.

[0068] The bar is initially upset, and the length of the first end 1 along the Z-axis direction remains unchanged (that is, the same as the diameter of the bar), and along the Y-axis direction (that is, the thickness) includes an upset section compressed to L1' and a connecting section connecting the upset section and the second end. The two side surfaces of the upset section along the X-axis direction extend outward to L2', and the shape of the connecting section does not change during the initial upset.

[0069] like Figure 4 、 5 As shown, the bar that has completed the initial upsetting is subjected to final upsetting, the length of the first end 1 along the Z-axis direction remains unchanged (that is, the same as the diameter of the bar), the upsetting section and the connecting section are compressed together along the Y-axis direction (that is, the thickness) to L1 (L1 is smaller than L1'), and the two side surfaces along the X-axis direction extend outward to L2 (L2 is larger than L2').

[0070] In step 102 , the elongated bar is subjected to at least two upsetting presses to form a thickened and shorted blank for subsequent forming processing.

[0071] Step 103: Upsetting the blank along a first direction to obtain a preform in which the first end 1 forms a pole body portion with a columnar structure and the second end 2 and / or the first end 1 form a transfer piece body portion with a sheet structure; the first direction is perpendicular to a direction from the first end 1 to the second end 2;

[0072] Specifically, the blank is placed at a preset position in the cavity of the first molding die, and the opening and closing directions of the first molding die are the same as the first direction; the first molding die is closed so that the first end 1 is upset to form a pole body part with a columnar structure, and the first end 1 and the second end 2 are simultaneously pressed to form a adapter body part with a sheet structure, so as to obtain a preformed part in which the pole body part and the adapter body part are perpendicular to each other.

[0073] Exemplarily, the blank is rotated so that the direction from the first end 1 to the second end 2 is perpendicular to the first direction, and is horizontally placed in the cavity of the first forming mold. When the upper and lower molds of the first forming mold are closed and pressed, the material in the middle of the first end 1 is pressed to form a pole body portion with a columnar structure, and the first end 1 and the second end 2 are simultaneously pressed to form a transfer piece body portion with a sheet structure, and the pole body portion and the transfer piece body portion are perpendicular to each other.

[0074] In some embodiments, from step 102 to step 103, the blank needs to be rotated 90° so that it can be placed flat in the cavity of the first molding die.

[0075] like Figure 6 、 7 As shown, in order to achieve the preset size of the product and avoid the risk of material shortage at the pole, a first step 11 is formed on the back of the first end 1 during upsetting; a second step 21 is formed at the connection between the first end 1 and the second end 2.

[0076] In some embodiments, in order to squeeze the material hidden on the back of the pole (ie, the first step 11 ) to fill the second step 21 of the pole in the subsequent upsetting process, the volume of the first step 11 is at least twice that of the second step 21 .

[0077] Preferably, the volume of the first step 11 is three times the volume of the second step 21 , so that the second step 21 is fully filled with the material of the first step 11 .

[0078] Step 104: shaping and / or precision cutting the preform to obtain a finished product.

[0079] Specifically, shaping the preform includes: Figure 13 、 14 As shown, one side of the first end 1 is extended downward into the lower mold cavity of the second forming mold, one side of the first step 11 is facing the upper mold punch, and the end face of the punch is flat. When the mold is closed, the material of the first step 11 is filled into the second step 21 by extrusion.

[0080] The preform is subjected to rough cutting, specifically comprising: Figure 9 、 10As shown, the tab via and the adapter shape located in the middle of the preformed adapter are roughly cut.

[0081] Among them, the tab through-hole is used for the tab to pass through. Roughly cutting the adapter plate shape and the tab through-hole in the middle can facilitate upsetting the third step 22, and the material has more flow space to facilitate better material flow.

[0082] The preform is formed, specifically comprising: Figure 11 、 12 As shown, the pole hole of the lower mold cavity of the second molding die is positioned with the first end 1. When the mold is closed, a groove portion and a protrusion portion are provided at the mold cavity of the second molding die, and the groove portion is used to adapt to the pole body portion; part of the material of the second end 2 flows along the second direction to form a third step 22, and the adapter body portion forms a connecting groove for supplying and placing the pole ear through the protrusion; the connecting groove formed at the third step 22 is used for supplying and placing the pole ear.

[0083] A limit is provided in the Y-axis direction to restrict the material from flowing in the Y-axis direction, thereby preventing the position of the pole and the adapter from changing, and causing the material to flow in the Z-axis direction to form the third step 22 .

[0084] The preform is finely cut, specifically comprising: Figure 13 、 14 As shown, a composite die blanking method is used to simultaneously precisely cut the tab via and the outer shape on the second end 2 to obtain an integrally formed pole and adapter.

[0085] Embodiment 2 of the present invention provides a method for forming a battery pole structure, such as Figure 15 As shown, the method is implemented by the following steps:

[0086] Step 201: Obtaining bar material;

[0087] Specifically, the bar material has a short and thick shape.

[0088] In this embodiment, the rod material may be a copper rod or an aluminum rod with a circular, elliptical or polygonal structure.

[0089] Step 202: Extruding the bar to obtain a blank; the blank includes a first end 1 and a second end 2, and the cross-sectional dimension of the first end 1 is larger than the cross-sectional dimension of the second end 2;

[0090] Specifically, the side wall of one end of the bar is extruded in a direction perpendicular to the second direction to obtain a blank in which the second end 2 is extruded to a preset cross-sectional size and the cross-sectional size of the first end 1 is the same as the cross-sectional size of the bar; the second direction is parallel to or coincides with the direction from the first end 1 to the second end 2, and the subsequent process provides the material required for upsetting the aluminum bar to form the pole.

[0091] The second end 2 is extruded to a preset cross-sectional size so that sufficient material for forming the adapter plate is squeezed to the second end 2 to avoid insufficient material at the adapter plate.

[0092] When the side wall of one end of the bar is extruded in a direction perpendicular to the second direction, the length of the second end 2 of the blank along the first direction and the third direction is extruded to a fourth value, and the length along the second direction is extruded to a fifth value; the fourth value is equal to the width dimension value of the first end in the first direction; the sum of the fifth value and the length dimension value of the first end in the second direction is greater than the length dimension value of the bar in the second direction; in this way, the second end 2 is extruded to a preset cross-sectional size, and the length of the second end 2 in the second direction is much greater than the length in the third direction or the second direction, in order to form a rectangular adapter respectively; at the same time, when upsetting along the first direction, the material flows along the second direction and the third direction, and the flow amount in the third direction is greater than the flow amount in the second direction, so as to form a rectangular sheet, which is easier to form into a sheet.

[0093] like Figure 16 、 17 As shown in the figure, the Z-axis direction is the first direction, the Y-axis direction is the second direction, and the X-axis direction is the third direction.

[0094] In some embodiments, after the bar is extruded along the Z-axis direction, the length of the second end 2 along the X-axis and Z-axis directions is extruded to L3, and the length along the Y-axis direction is extruded to L4.

[0095] After the rod is extruded, the first end 1 is elliptical and the second end 2 is extruded into a thin cylindrical structure; the diameter of the second end 2 is the same as the distance between the two side surfaces of the first end 1 along the Z-axis direction.

[0096] In step 202 , the short and thick bar material is extruded to form a slender blank for subsequent forming processing.

[0097] Step 203: Upsetting the blank along a first direction to obtain a preform in which the first end 1 forms a pole body portion with a columnar structure and the second end 2 and / or the first end 1 form a transfer plate body portion with a sheet structure; the first direction is perpendicular to a direction from the first end 1 to the second end 2;

[0098] Specifically, the blank is placed at a preset position in the cavity of the first molding die, and the opening and closing directions of the first molding die are the same as the first direction; the first molding die is closed so that the first end 1 is upset to form a pole body part with a columnar structure, and the first end 1 and the second end 2 are simultaneously pressed to form a adapter body part with a sheet structure, so as to obtain a preformed part in which the pole body part and the adapter body part are perpendicular to each other.

[0099] Exemplarily, the blank is rotated so that the direction from the first end 1 to the second end 2 is perpendicular to the first direction, and is horizontally placed in the cavity of the first forming mold. When the upper and lower molds of the first forming mold are closed and pressed, the material in the middle of the first end 1 is pressed to form a pole body portion with a columnar structure, and the first end 1 and the second end 2 are simultaneously pressed to form a transfer piece body portion with a sheet structure, and the pole body portion and the transfer piece body portion are perpendicular to each other.

[0100] In some embodiments, from step 202 to step 203, the blank needs to be rotated 90° so that it can be placed flat in the cavity of the first molding die.

[0101] In order to achieve the preset size of the product and avoid the risk of material shortage at the pole, a first step 11 is formed on the back of the first end 1 during upsetting; and a second step 21 is formed at the connection between the first end 1 and the second end 2.

[0102] In some embodiments, in order to squeeze the material hidden on the back of the pole (ie, the first step 11 ) to fill the second step 21 of the pole in the subsequent upsetting process, the volume of the first step 11 is at least twice that of the second step 21 .

[0103] Preferably, the volume of the first step 11 is three times the volume of the second step 21 , so that the second step 21 is fully filled with the material of the first step 11 .

[0104] Step 204: shaping and / or precision cutting the preform to obtain a finished product.

[0105] Specifically, shaping the preform includes: Figure 13 、 14 As shown, one side of the first end 1 is extended downward into the lower mold cavity of the second forming mold, one side of the first step 11 is facing the upper mold punch, and the end face of the punch is flat. When the mold is closed, the material of the first step 11 is filled into the second step 21 by extrusion.

[0106] The preform is subjected to rough cutting, specifically comprising: Figure 9 、 10 As shown, the tab via and the adapter shape located in the middle of the preformed adapter are roughly cut.

[0107] Among them, the tab through-hole is used for the tab to pass through. Roughly cutting the adapter plate shape and the tab through-hole in the middle can facilitate upsetting the third step 22, and the material has more flow space to facilitate better material flow.

[0108] The preform is formed, specifically comprising: Figure 11 、 12 As shown, the pole hole of the lower mold cavity of the second molding die is positioned with the first end 1. When the mold is closed, a groove portion and a protrusion portion are provided at the mold cavity of the second molding die, and the groove portion is used to adapt to the pole body portion; part of the material of the second end 2 flows along the second direction to form a third step 22, and the adapter body portion forms a connecting groove for supplying and placing the pole ear through the protrusion; the connecting groove formed at the third step 22 is used for supplying and placing the pole ear.

[0109] A limit is provided in the Y-axis direction to restrict the material from flowing in the Y-axis direction, thereby preventing the position of the pole and the adapter from changing, and causing the material to flow in the Z-axis direction to form the third step 22 .

[0110] The preform is finely cut, specifically comprising: Figure 13 、 14 As shown, a composite die blanking method is used to simultaneously precisely cut the tab via and the outer shape on the second end 2 to obtain an integrally formed pole and adapter.

[0111] Embodiment 3 of the present invention provides a method for forming a battery pole structure, such as Figure 18 As shown, the method is implemented by the following steps:

[0112] Step 301: Obtaining bar material;

[0113] In some embodiments, the bar material is an aluminum bar.

[0114] Step 302: Extruding the bar to obtain a blank; the blank includes a first end 1 and a second end 2, and the cross-sectional dimension of the first end 1 is larger than the cross-sectional dimension of the second end 2;

[0115] Specifically, if Figure 19 As shown, the rod is extruded into a blank including a first end 1 and a second end 2 by an extrusion molding device; wherein the first end 1 and the second end 2 are extruded to a preset cross-sectional size. In this way, the rod is directly extruded into the material required for forming the pole and the adapter by the extrusion molding device, reducing the molding process.

[0116] Step 303: Upsetting the blank along a first direction to obtain a preform having a pole body portion having a columnar structure at the first end 1 and a transfer plate body portion having a sheet structure at the second end 2; the first direction being perpendicular to a direction from the first end 1 to the second end 2;

[0117] Specifically, the blank is placed at a preset position in the cavity of the first molding die, and the opening and closing directions of the first molding die are the same as the first direction; the first molding die is closed so that the first end 1 is upset to form a pole body part with a columnar structure, and the first end 1 and the second end 2 are simultaneously pressed to form a adapter body part with a sheet structure, so as to obtain a preformed part in which the pole body part and the adapter body part are perpendicular to each other.

[0118] Exemplarily, the blank is rotated so that the direction from the first end 1 to the second end 2 is perpendicular to the first direction, and is horizontally placed in the cavity of the first forming mold. When the upper and lower molds of the first forming mold are closed and pressed, the material in the middle of the first end 1 is pressed to form a pole body portion with a columnar structure, and the first end 1 and the second end 2 are simultaneously pressed to form a transfer piece body portion with a sheet structure, and the pole body portion and the transfer piece body portion are perpendicular to each other.

[0119] In order to achieve the preset size of the product and avoid the risk of material shortage at the pole, a first step 11 is formed on the back of the first end 1 during upsetting; and a second step 21 is formed at the connection between the first end 1 and the second end 2.

[0120] In some embodiments, in order to squeeze the material hidden on the back of the pole (ie, the first step 11 ) to fill the second step 21 of the pole in the subsequent upsetting process, the volume of the first step 11 is at least twice that of the second step 21 .

[0121] Preferably, the volume of the first step 11 is three times the volume of the second step 21 , so that the second step 21 is fully filled with the material of the first step 11 .

[0122] Step 304: shaping and / or precision cutting the preform to obtain a finished product.

[0123] Specifically, shaping the preform includes: Figure 13 、 14 As shown, one side of the first end 1 is extended downward into the lower mold cavity of the second forming mold, one side of the first step 11 is facing the upper mold punch, and the end face of the punch is flat. When the mold is closed, the material of the first step 11 is filled into the second step 21 by extrusion.

[0124] The preform is subjected to rough cutting, specifically comprising: Figure 9 、10 As shown, the tab via and the adapter shape located in the middle of the preformed adapter are roughly cut.

[0125] Among them, the tab through-hole is used for the tab to pass through. Roughly cutting the adapter plate shape and the tab through-hole in the middle can facilitate upsetting the third step 22, and the material has more flow space to facilitate better material flow.

[0126] The preform is formed, specifically comprising: Figure 11 、 12 As shown, the pole hole of the lower mold cavity of the second molding die is positioned with the first end 1. When the mold is closed, a groove portion and a protrusion portion are provided at the mold cavity of the second molding die, and the groove portion is used to adapt to the pole body portion; part of the material of the second end 2 flows along the second direction to form a third step 22, and the adapter body portion forms a connecting groove for supplying and placing the pole ear through the protrusion; the connecting groove formed at the third step 22 is used for supplying and placing the pole ear.

[0127] A limit is provided in the Y-axis direction to restrict the material from flowing in the Y-axis direction, thereby preventing the position of the pole and the adapter from changing, and causing the material to flow in the Z-axis direction to form the third step 22 .

[0128] The preform is finely cut, specifically comprising: Figure 13 、 14 As shown, a composite die blanking method is used to simultaneously precisely cut the tab via and the outer shape on the second end 2 to obtain an integrally formed pole and adapter.

[0129] Embodiment 4 of the present invention provides a battery pole structure, which adopts the process method described in any one of the above embodiments 1-3 to form an integrally formed pole and adapter, and no welding is required between the pole and the adapter.

[0130] The above disclosure is merely a preferred embodiment of the present invention and certainly cannot be used to limit the scope of the present invention. Therefore, equivalent changes made according to the claims of the present invention are still within the scope of the present invention.

Claims

1. A method for forming a battery pole structure, characterized in that: The following steps are involved: Get the bar stock; Upsetting or extruding the bar to obtain a blank; the blank comprises a first end and a second end, and a cross-sectional dimension of the first end is greater than a cross-sectional dimension of the second end; The blank is upset along a first direction to obtain a preform having a pole body portion with a columnar structure formed at the first end and an adapter body portion with a sheet structure formed at the second end and / or the first end; the first direction is perpendicular to a direction from the first end to the second end; The preform is shaped and / or finely cut to obtain a finished product.

2. The method for forming a battery pole structure according to claim 1, wherein: The steps of upsetting the bar to obtain a blank include: The end of the bar is upset along a second direction to obtain a blank having a first end upset to a preset cross-sectional size and a second end having a cross-sectional size identical to that of the bar; the second direction is parallel to or coincides with a direction from the first end to the second end.

3. The method for forming a battery pole structure according to claim 2, wherein: The step of upsetting the end of the bar along the second direction comprises: The first end of the blank is upset to a preset cross-sectional size by at least two times, and the upsetting length of the first end in the second direction during each upsetting is not greater than the width dimension value of the second end in the first direction; the first direction and the second direction are perpendicular to each other.

4. The method for forming a battery pole structure according to claim 3, characterized in that: When the bar is upset at least twice along the second direction, the length of the first end of the blank along the first direction is upset to a first value, the length along the second direction is upset to a second value, and the length along the third direction is upset to a third value; the third value is greater than the first value, the first value is equal to the width dimension of the bar in the first direction, and the third direction is perpendicular to the first direction.

5. The method for forming a battery pole structure according to claim 1, wherein: The step of extruding the bar to obtain a blank comprises: The side wall of one end of the bar is extruded in a direction perpendicular to the second direction to obtain a blank whose second end is extruded to a preset cross-sectional size and whose cross-sectional size at the first end is the same as the cross-sectional size of the bar; the second direction is parallel to or coincides with the direction from the first end to the second end.

6. The method for forming a battery pole structure according to claim 5, characterized in that: When the side wall of one end of the bar is extruded in a direction perpendicular to the second direction, the length of the second end of the billet along the first direction is extruded to a fourth value, and the length along the second direction is extruded to a fifth value; the fourth value is equal to the width dimension value of the first end in the first direction; the sum of the fifth value and the length dimension value of the first end in the second direction is greater than the length dimension value of the bar in the second direction.

7. The method for forming a battery pole structure according to claim 1, wherein: The step of extruding the bar to obtain a blank comprises: The rod material is extruded into a blank including a first end and a second end by an extrusion molding device; wherein the first end and the second end are extruded to a preset cross-sectional size.

8. The method for forming a battery pole structure according to any one of claims 1 to 6, characterized in that: The step of upsetting the blank along a first direction to obtain a preformed part in which the first end forms a pole body part with a columnar structure and the second end and / or the first end form a transfer piece body part with a sheet structure includes: placing the blank at a preset position in the cavity of a first forming mold, and the opening and closing directions of the first forming mold are the same as the first direction; closing the first forming mold so that the first end is upset to form a pole body part with a columnar structure, and the first end and the second end are simultaneously thinned to form a transfer piece body part with a sheet structure, so as to obtain a preformed part in which the pole body part and the transfer piece body part are perpendicular to each other.

9. The method for forming a battery pole structure according to claim 8, characterized in that: When the first molding mold is closed, the first end and the second end extend and become thinner along the second direction and the third direction to form the adapter plate body; the extension amount of the first end and the second end in the second direction is less than the extension amount in the third direction; any two directions among the first direction, the second direction and the third direction are perpendicular to each other.

10. The method for forming a battery pole structure according to claim 9, characterized in that: When the first molding die is closed, a first step is formed on the back of the first end; a second step is formed at the connection between the first end and the second end, and the volume of the first step is at least twice that of the second step.

11. The method for forming a battery pole structure according to claim 10, wherein: The steps of shaping the preform to obtain a finished product include: The preform is placed in the cavity of the second molding die, and the cavity of the second molding die is provided with a groove portion and a protrusion portion, and the groove portion is used to adapt to the pole body portion; when the mold is closed, the material of the first step is squeezed and filled to the second step, and the adapter body portion forms a connecting groove for placing the pole ear through the protrusion portion.

12. A battery pole structure, characterized in that: The battery pole structure forming method according to any one of claims 1 to 11 is used to form an integrally formed pole and adapter.

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