Battery pole forming method

Abstract

The present invention discloses a battery pole forming method, which comprises the following steps: providing a bar stock; pressing the bar stock along a first direction to obtain a bar stock body and a pole body extending to the periphery of the bar stock body along a second direction; the first direction is the axial direction of the bar stock, and the second direction is perpendicular to the first direction; pressing the bar stock body along the second direction to form a connecting piece body, so as to obtain a formed part in which the connecting piece body and the pole body are integrally formed. The present invention prepares the battery pole by pressing and forming, and the material loss in the battery pole forming process is small, the material utilization rate is improved, and the production cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of battery processing, and more specifically, to a battery pole forming method. Background Art

[0002] The pole is a component that connects the electrodes of adjacent single cells in a battery pack. One end of the pole is connected to the connecting piece, and the other end is connected to the external conductor. The pole is divided into a positive pole and a negative pole. The positive pole is generally made of copper or copper-aluminum composite materials, and the negative pole is generally made of aluminum. In addition, since the pole material requires the use of metals with good conductivity, the raw materials of copper and aluminum for manufacturing poles are expensive, and the material cost accounts for more than 60% of the production cost of the pole.

[0003] In the prior art, the pole and the connecting piece are usually formed separately and then welded together, or cut and formed by CNC or other cutting processing methods; the former has high welding requirements, resulting in a high welding defect rate, and the latter has a large amount of material cutting and a long processing time; this results in a low material utilization rate of the pole and the connecting piece during processing, a high processing cost, and is not conducive to processing and use. Summary of the invention

[0004] The purpose of the present invention is to overcome the above-mentioned defects in the prior art, provide a battery pole forming method, and improve the utilization rate of raw materials.

[0005] To achieve the above object, the technical solution of the present invention is as follows:

[0006] A battery pole forming method comprises the following steps:

[0007] Provide bar stock;

[0008] The bar is pressed along a first direction to obtain a bar body and a pole body extending to the periphery of the bar body along a second direction; the first direction is the axial direction of the bar, and the second direction is perpendicular to the first direction;

[0009] The bar body is pressed and formed into a connecting piece body along a second direction to obtain a molded part in which the connecting piece body and the pole body are integrally formed.

[0010] In one of the embodiments, when the rod is pressed along the first direction, the rod body and the pole body are obtained by pressing the rod along the first direction from the first end of the rod, or the rod body and the pole body are obtained by pressing the rod along the positive and negative directions of the first direction from the first end and the second end of the rod at the same time.

[0011] In one embodiment, when the bar is pressed along a first direction to obtain a bar body portion and a pole body portion, distances from the pole body portion to the first end and the second end are not equal.

[0012] In one embodiment, the maximum dimension of the bar body in the third direction is not less than the maximum dimension of the pole body in the third direction.

[0013] In one embodiment, a cross-sectional dimension of the bar in the first direction is the same as a cross-sectional dimension of the bar body in the first direction.

[0014] In one embodiment, the cross-section of the rod in the first direction is a circular, square, elliptical or polygonal structure.

[0015] In one embodiment, the following steps are also included:

[0016] Cutting: cutting the connecting piece body to a preset shape and size.

[0017] In one embodiment, when the bar is pressed along a first direction to obtain a bar body portion and a pole body portion extending to the periphery of the bar body portion along a second direction, the bar is formed into the pole body portion and the bar body portion by a first forming die.

[0018] In one embodiment, the first molding die includes a first block, the first block is provided with a first cavity for accommodating the bar material and a second cavity for molding the pole body, the first cavity is provided with an opening adapted to the punch of the first molding die at at least one end along the first direction, the second cavity is connected to the first cavity, and the inner cavity size of the second cavity is the same as the outer contour size of the pole body.

[0019] In one embodiment, when the rod body is pressed and formed into a connecting piece body along a second direction to obtain a molded part in which the connecting piece body and the pole body are integrally formed, the rod body is formed into the connecting piece body by a second molding die.

[0020] Implementing the embodiments of the present invention will have the following beneficial effects:

[0021] The embodiment of the present invention applies a pressing force to the rod along a first direction to obtain a rod body and a pole body extending to the peripheral side of the rod body along a second direction, and then presses the rod body along the second direction to form a connecting piece body to obtain a molded part in which the connecting piece body and the pole body are integrally formed. The battery pole is prepared by the pressing and holding molding method, and the material loss in the battery pole molding process is less, which improves material utilization and reduces production costs. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0023] in:

[0024] Figure 1 It is a front view of a rod material in a battery pole forming method according to a specific embodiment of the present invention.

[0025] Figure 2 It is a bottom view of a rod material in a battery pole forming method according to a specific embodiment of the present invention.

[0026] Figure 3 It is a front view of a molded part 1 in a battery pole molding method according to a specific embodiment of the present invention.

[0027] Figure 4 It is a bottom view of a molded part 1 in a battery pole molding method according to a specific embodiment of the present invention.

[0028] Figure 5 It is a front view of a molded part 2 in a battery pole molding method according to a specific embodiment of the present invention.

[0029] Figure 6 It is a bottom view of a molded part 2 in a battery pole molding method according to a specific embodiment of the present invention.

[0030] Figure 7 It is a front view of a finished battery pole in a battery pole forming method according to a specific embodiment of the present invention.

[0031] Figure 8 It is a bottom view of a finished battery pole in a battery pole forming method according to a specific embodiment of the present invention.

[0032] Fig. 9 It is a schematic diagram of the cross-sectional structure of a first molding die according to a specific embodiment of the present invention.

[0033] Fig.10It is a schematic diagram of the forming of the pole body according to a specific embodiment of the present invention.

[0034] Fig.11 It is a schematic diagram of the cross-sectional structure of a second molding die according to a specific embodiment of the present invention.

[0035] Fig.12 It is a schematic diagram of the molding of the connecting piece body according to a specific embodiment of the present invention.

[0036] Among them, 10, the first molding die; 11, the first block; 12, the first cavity; 13, the second cavity; 14, the opening; 20, the second molding die; 21, the second block; 22, the third cavity; 23, the fourth cavity; 30, the rod; 51, the pole body; 52, the connecting piece body; 60, the punch one; 70, the punch two; 80, the molded part one; 81, the rod body; 90, the molded part two. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only 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 ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] Please refer to Figure 1 to Figure 12 The present invention discloses a battery pole forming method, comprising the following steps:

[0039] Step 1: Provide a bar material 30. The bar material 30 is as follows: Figure 1 and Figure 2 shown.

[0040] Step 2: Press the bar 30 along the first direction to obtain the bar body 81 and the pole body 51 extending to the side of the bar body 81 along the second direction; wherein the first direction is the axial direction of the bar 30, and the second direction is perpendicular to the first direction. After this step is completed, a molded part 80 can be obtained. The molded part 80 is as shown in FIG. Figure 3 and Figure 4 shown.

[0041] Step 3: Press and hold the rod body 81 along the second direction to form the connecting piece body 52, so as to obtain a molded part in which the connecting piece body 52 and the pole body 51 are integrally formed. In this step, a molded part 90 can be obtained. The molded part 90 is as follows: Figure 5 and Figure 6 shown.

[0042] Figures 1 to 8, the direction indicated by arrow X is the first direction, the direction indicated by arrow Y is the second direction, and the direction indicated by arrow Z is the third direction.

[0043] It can be understood that the battery pole forming method of the present invention prepares the battery pole by a pressure-holding forming method, and the material loss during the battery pole forming process is small, thereby reducing the processing cost.

[0044] In one embodiment, after step 3, the battery pole forming method of this embodiment further includes step 4, which includes the following steps: cutting, cutting the connecting piece body 52 to a preset shape and size value, thereby forming a finished battery pole. The finished battery pole is as follows: Figure 7 and Figure 8 shown.

[0045] In one embodiment, the maximum dimension of the bar body 81 in the third direction is not less than the maximum dimension of the pole body 51 in the third direction. Furthermore, the third direction is perpendicular to the first direction and the second direction. By so doing, the integrity of the pressed pole body 51 can be ensured.

[0046] In one embodiment, the cross-sectional dimension of the rod 30 in the first direction is the same as the cross-sectional dimension of the rod body 81 in the first direction, thereby facilitating rapid pressing and forming of the pole body 51 around the rod body 81 .

[0047] In one embodiment, the method for preparing the bar 30 in step 1 comprises the following steps:

[0048] First, a rod 30 of appropriate diameter is selected according to the size of the final finished pole body 51, and the cross-sectional width of the rod 30 in the first direction is greater than or equal to the maximum cross-sectional width of the final finished pole body 51 in the second direction, so that a complete shape of the pole body 51 can be formed.

[0049] For details, please refer to Figure 1 and Figure 2 The cross section of the bar 30 in the first direction is circular, referring to Figure 3 and Figure 4 The cross section of the final finished column head body part 51 in the second direction is also circular, and the maximum cross-sectional diameter of the final finished column body part 51 is d, and the cross-sectional diameter of the rod material 30 is D1, D1≥d.

[0050] Then, the length H of the bar 30 is calculated according to the volume of the final pole product. Preferably, the volume of the final pole product is equal to 80% to 95% of the volume of the bar 30, leaving a small space for cutting waste to avoid wasting materials.

[0051] After the cross-sectional diameter and length of the bar 30 are determined, the bar 30 can be cut into pieces by a cutting die, and the bar can be cut to a required length H to obtain the bar 30 .

[0052] According to the above steps, the diameter and length of the required bar material 30 are calculated respectively, which can reduce waste as much as possible.

[0053] In one embodiment, the cross section of the rod 30 in the first direction is a circular, square, elliptical or polygonal structure, that is, the radial cross section of the rod 30 can be circular, elliptical or polygonal, so that the rod 30 can be selected as a square, rectangle, prism, triangle or a polygon with more than four sides. The battery pole forming method of the present invention is applicable to rods of various shapes and structures.

[0054] In one embodiment, in step 2, when the bar 30 is pressed along the first direction, the bar body 81 and the pole body 51 are obtained by pressing the bar 30 from the first end of the bar 30 along the first direction, or the bar 30 is pressed from the first end and the second end of the bar 30 in the positive and negative directions of the first direction respectively, so as to obtain the bar body 81 and the pole body 51. That is, in this step, not only the molding method of pressing at one end but also the molding method of pressing at both ends can be adopted.

[0055] Specifically, the bar 30 can be placed on the substrate, and a pressing tool, such as a punch, can be used to forge the bar 30 from one end, or pressing tools can be used to press the bar 30 from both ends.

[0056] The battery pole forming method of the present invention is a forging forming method, that is, a hammer, anvil, punch or die of a forging machine is used to apply pressure to the raw material to cause plastic deformation, thereby obtaining a forming processing method of a part with a desired shape and size.

[0057] Furthermore, in this embodiment, when the rod 30 is pressed along the first direction to obtain the rod body 81 and the pole body 51, the distances from the pole body 51 to the first end and the second end are not equal, thereby facilitating the forming of an eccentric pole and achieving the effect of improving material utilization.

[0058] In one embodiment, since the planar size of the connecting piece body 52 is larger than the planar size of the pole body 51 , preferably, the cross-sectional width of the bar 30 in the first direction is greater than or equal to the maximum cross-sectional width of the pole body 51 in the first direction.

[0059] When the bar 30 is forged along the axial direction of the bar 30, the length of the bar 30 along the axial direction becomes shorter. In order to facilitate the forging and forming of the pole body 51, the bar 30 should be restricted in the radial direction, and the length of the bar 30 along the axial direction becomes shorter. At the same time, the radial width of the bar 30 remains unchanged, so that the material part with the reduced length in the axial direction is deformed to form the pole body 51. Therefore, in step 2, the cross-sectional width of the formed bar body 81 in the first direction should be equal to or greater than the cross-sectional width of the bar in the first direction. Specifically, the cross-sectional width of the bar body 81 in the first direction is D2, D2≥D1, preferably, D1≤D2≤1.2D1, and further, D2 is D1, 1.05D1, 1.10 D1, 1.15 D1 or 1.20 D1.

[0060] In one embodiment, when the rod 30 is pressed along the first direction from the first end of the rod 30 to obtain the rod body 81 and the pole body 51 , the pole body 51 is close to the first end of the rod body 81 , and an eccentric pole can be formed.

[0061] In one embodiment, the first molding die 10 comprises a first block 11, wherein a first cavity 12 for accommodating the bar stock and a second cavity 13 for molding the pole body 51 are provided in the first block 11, wherein at least one end of the first cavity 12 along the first direction is provided with an opening 14 adapted to the punch 160 of the first molding die 10, and the second cavity 13 is connected to the first cavity 12, and the inner cavity size of the second cavity 13 is the same as the outer contour size of the pole body 51. The bar stock is deformed in the cavity to form the bar stock body 81 and the pole body 51 through the cavity restriction effect of the first molding die 10, so as to facilitate the molding of the molded part 80.

[0062] Furthermore, the extension direction of the second cavity 13 is perpendicular to the extension direction of the first cavity 12 .

[0063] The bar material 30 is placed in the first forming die 10, and pressure is applied to the bar material 30 along the axial direction of the bar material 30 from one or both ends of the bar material 30 to extrude the bar material 30, and the pole body 51 is formed from the side of the bar material 30 through the cavity restriction effect of the first forming die 10, while the remaining bar material is still in a bar shape, thereby obtaining a formed part 80. The remaining bar material is still in a bar shape, which is convenient for forming a regular-shaped connecting piece body 52 in step three.

[0064] Specifically, refer to Fig. 9 and Fig.10, the bar 30 is placed in the first cavity 12 from the opening 14, and a punch 60 is used to apply pressure along the axial direction of the bar 30 from the opening 14 to extrude the bar 30, and the bar 30 flows toward the second cavity 13 under the limitation of the first cavity 12, and the pole body 51 is formed on the side of the bar 30 to obtain a molded part 80. The molded part 80 includes the pole body 51 and the bar body 81.

[0065] In the above technical solution, the first cavity 12 limits the bar 30 to be in a bar shape after forging, so that a regular square connecting piece body 52 can be formed in the subsequent forging step of step 3, so that the waste of materials in the cutting step of step 4 is minimized, and the utilization rate of raw materials is improved. By forming the pole body 51 from the side of the bar 30, the distance between the formed pole body 51 and the upper and lower ends of the remaining bar can be different, thereby forming an eccentric pole.

[0066] In a preferred embodiment, the inner cavity size of the first cavity 12 is consistent with the outer contour size of the bar 30. The consistent size mentioned here means the same or substantially the same size, that is, the inner cavity width of the first cavity 12 is equal to or slightly larger than the cross-sectional width of the bar 30 in the first direction, and the inner cavity width of the first cavity 12 is larger than the cross-sectional width of the bar 30 in the first direction, so that the bar 30 can enter the first cavity 12 easily. The closer the inner cavity size of the first cavity 12 is to the size of the bar 30, not only can the length and width of the connecting piece body 52 be full when forging, but also the second cavity 13 can be filled when the material flows freely, thereby reducing the required forming force.

[0067] Specifically, the inner width of the first cavity 12 is between 1.00 and 1.10 times the cross-sectional width of the bar 30 in the first direction. Further, the inner width of the first cavity 12 is 1.00, 1.03, 1.05, 1.07 or 1.10 times the cross-sectional width of the bar 30 in the first direction.

[0068] In a preferred embodiment, the inner shape of the first cavity 12 is consistent with the outer contour of the bar 30. The shape consistency mentioned here refers to the same or substantially the same shape. For example, if the cross section of the bar 30 is circular, the inner shape of the first cavity 12 can be circular or an ellipse close to a circle. Of course, the inner shape of the first cavity 12 is the same as the outer contour of the bar 30, which is the best solution.

[0069] In a preferred embodiment, the inner cavity width of the first cavity 12 is greater than or equal to the maximum inner cavity width of the second cavity 13, so that the cross-sectional width of the bar material 30 accommodated in the first cavity 12 in the first direction is greater than or equal to the maximum cross-sectional width of the final finished pole body 51 in the second direction, so as to be able to extrude the complete shape of the pole body 51.

[0070] The inner shape of the first cavity 12 can be circular, elliptical or polygonal (eg, square, rectangular, prism, triangle or polygon with more than four sides, etc.).

[0071] Specifically, refer to Figure 1 and Figure 2 In one embodiment, the cross-sectional shape of the bar 30 in the first direction is circular, with a diameter of D1 and a length of H. Fig. 9 , the inner cavity shape of the first cavity 12 is also circular, with a diameter of D3. The cross-sectional shape of the bar body 81 of the molded part 80 formed in step 2 in the first direction is circular, with a diameter of D2. The outer contour shape and size of the bar body 81 are the same as the inner cavity shape and size of the first cavity 12, that is, D3=D2=D1. The length of the bar body 81 of the molded part 80 formed in step 2 is H1, and H1<H. Since the bar body 81 flows uniformly to the surroundings during the forging process in step 3, H1 is smaller than the length L1 of the connecting piece body 52 formed in step 2, and is also smaller than the length L of the connecting piece body 52 formed in step 4. D2 is smaller than the width W1 of the connecting piece body 52 formed in step 3, and is also smaller than the width W of the connecting piece body 52 formed in step 4.

[0072] In one embodiment, in step three, the bar body 81 is pressed along the second direction, and the bar body 81 flows to the surroundings and becomes thinner, forming the connecting piece body 52, and obtaining the second molded part 90. In this step, the bar body 81 is molded into the connecting piece body 52 by the second molding die 20. The connecting piece body 52 is formed by the cavity restriction effect of the second molding die 20.

[0073] Specifically, refer to Fig.11 and Fig.12 The second molding mold 20 includes a second block 21, and the surface of the second block 21 is provided with a third cavity 22 for molding the connecting piece body 52, and the bottom of the third cavity 22 is provided with a fourth cavity 23 for positioning and accommodating the pole body 51, and the fourth cavity 23 is connected to the third cavity 22, and the height of the third cavity 22 is equal to the thickness of the connecting piece body 52.

[0074] Reference Fig.12 , the pole body part 51 of the molded part 80 is accommodated downward in the fourth cavity 23, and the pressure along the axial direction of the pole body part 51 is applied from the side of the molded part 80 opposite to the pole body part 51 by the punch 70 to extrude the molded part 80, and the bar body part 81 of the molded part 80 flows evenly around and becomes thinner until the thickness of the connecting piece body part 52 is the same as the height of the third cavity 22, thereby obtaining the molded part 90.

[0075] In the above technical solution, since the pressure along the axial direction of the pole body 51 is applied from the side of the rod body 81 to extrude the molded part 80, the rod body 81 is in a rod shape, and therefore, the connecting piece body 52 of the obtained molded part 90 is in a square shape, as shown in FIG. Figure 5 and Figure 6 As shown, the square shape of the connecting piece body 52 in step three is closer to the final product, thereby improving the utilization rate of the raw materials.

[0076] In a preferred embodiment, after the connecting piece main body 52 is formed, there may be a serrated structure at the edge, so the inner cavity side length of the third cavity 22 should be 1mm~2mm longer than the side length of the connecting piece main body 52 of the final product. This leaves a certain amount of surplus space for cutting and shaping to ensure size and shape requirements, while also reducing the waste of excessive raw materials.

[0077] In a preferred embodiment, the inner shape of the third cavity 22 is square.

[0078] Specifically, Figure 5 and Figure 6 As shown, the length L1 and width W1 of the connecting piece body portion 52 of the molded part 2 90 obtained in step 3 are respectively 1 mm to 2 mm larger than the length L and width W of the final product in step 4. Figure 7 and Figure 8 As shown, the rectangular frame around the connecting piece body 52 in step 4 is the outer contour shape of the connecting piece body 52 of the molded part 2 90 obtained in step 3. It can be seen that the method of the present invention wastes less material and can greatly improve the utilization rate of materials. In this embodiment, Figure 5 and Figure 7 The middle dimension h is the thickness of the connecting piece body 52 .

[0079] In summary, the embodiment of the present invention forms the pole body 51 from the side of the rod 30 by using the first molding die 10, so that the distances between the formed pole body 51 and the upper and lower ends of the remaining rod can be different, thereby forming an eccentric pole, and the remaining rod 30 is restricted by the first cavity 12 and still maintains a rod-shaped structure, which is convenient for forming the connecting piece body 52 in the subsequent steps; the connecting piece body 52 is formed by applying pressure along the axial direction of the pole body 51 from the side of the rod 30 to extrude the material, and a square connecting piece body 52 similar to the longitudinal section shape of the rod 30 can be obtained, thereby minimizing the waste of material in the process of cutting the connecting piece body 52 to form the final product, thereby improving the utilization rate of raw materials.

[0080] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A battery pole forming method, characterized in that: The following steps are involved: Provide bar stock; The bar is pressed along a first direction to obtain a bar body and a pole body extending to the periphery of the bar body along a second direction; the first direction is the axial direction of the bar, and the second direction is perpendicular to the first direction; The bar body is pressed and formed into a connecting piece body along the second direction to obtain a molded part in which the connecting piece body and the pole body are integrally formed; wherein the length of the bar body in the first direction is less than the length of the connecting piece body in the first direction; Cutting: cutting the connecting piece body into a preset shape and size; When the bar is pressed along the first direction, the bar body and the pole body are obtained by pressing the bar from the first end of the bar along the first direction, or the bar body and the pole body are obtained by pressing the bar from the first end and the second end of the bar along the positive and negative directions of the first direction respectively; When the bar is pressed along a first direction to obtain a bar body and a pole body, the distances from the pole body to the first end and the second end are not equal; The maximum dimension of the bar body in the third direction is not less than the maximum dimension of the pole body in the third direction; When the bar is pressed along a first direction to obtain a bar body portion and a pole body portion extending to the periphery of the bar body portion along a second direction, the bar is formed into the pole body portion and the bar body portion by a first forming die; The first molding die comprises a first block, in which a first cavity for accommodating the bar material and a second cavity for molding the pole body are provided, the first cavity is provided with an opening adapted to the punch of the first molding die at at least one end along the first direction, the second cavity is connected to the first cavity, and the inner cavity size of the second cavity is the same as the outer contour size of the pole body.

2. The battery pole forming method according to claim 1, characterized in that: The cross-sectional dimension of the bar material in the first direction is the same as the cross-sectional dimension of the bar material body in the first direction.

3. The battery pole forming method according to claim 1, characterized in that: The cross section of the bar material in the first direction is arranged in a circular, elliptical or polygonal structure.

4. The battery pole forming method according to claim 1, characterized in that: When the bar body is pressed and formed into a connecting piece body along a second direction to obtain a molded part in which the connecting piece body and the pole body are integrally formed, the bar body is formed into the connecting piece body by a second molding die.

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