A method for manufacturing a battery soft connection

Abstract

A method for making a battery soft connection includes step 1, blanking; step 2, polymer diffusion welding short side; step 3, pre-bending; step 4, polymer diffusion welding long side; step 5, long side shaping; step 6, pre-cutting at the layering; step 7, punching countersunk heads and positioning holes; step 8, punching special-shaped holes and trimming the long side; step 9, punching holes and trimming the short side; step 10, cleaning oil stains; step 11, drying; step 12: full inspection and packaging. The battery soft connection made by the present invention has the advantages of large welding area, and the soft connection can buffer vibration to prevent the solder joint from falling off.

Description

Technical Field

[0001] The invention belongs to the technical field of battery accessories, and in particular relates to a method for manufacturing a battery soft connection. Background Art

[0002] When multiple cells are connected in parallel inside a single square-shell battery using hard-connected plates, the cells need to be precisely aligned, making the processing difficult and hard to control. The entire module can easily have solder joints fall off during vibration, affecting battery performance. In severe cases, the entire battery pack may be scrapped. Summary of the invention

[0003] The present invention aims to provide a method for manufacturing a battery soft connection to manufacture a battery soft connection, thereby offsetting vibration through the soft connection and preventing the welding point from falling off during the vibration process.

[0004] In order to achieve the above object, the present invention adopts the following technical scheme:

[0005] A method for manufacturing a battery soft connection comprises the following steps:

[0006] Step 1: Cutting: Cutting sheets of fixed length and width;

[0007] Step 2: polymer diffusion welding of short edges: stack several sheets of material, draw a line on the top sheet, divide the sheet into long edge segments and short edge segments by drawing a line, perform polymer diffusion welding on the short edge segments, and weld the short edge segments of all sheets together;

[0008] Step 3, pre-bending: bend the product in step 2 along the marked line so that the short side segment and the long side segment form a certain angle;

[0009] Step 4: Polymer diffusion welding long side: polymer diffusion welding is performed on the long side segments of the product in step 3, and the long side segments of all the sheets are welded together, and the bending parts are not welded;

[0010] Step 5, long side shaping: shaping the long side of the product in step 4;

[0011] Step 6: Pre-cutting at the layering: trimming the edges on both sides of the bending part of the product in step 4;

[0012] Step 7, punching countersunk heads and positioning holes: punching a plurality of sets of countersunk heads symmetrically on both sides of the long side of the product in step 6, and punching positioning holes at the end of the product away from the bending part;

[0013] Step 8, punching special-shaped holes and trimming the long side: punching a number of special-shaped holes as liquid seepage holes on the product in step 7, and trimming the long side of the product on both sides;

[0014] Step 9, short side punching and trimming: punching holes on the short side of the product in step 8, and trimming both sides of the short side of the product;

[0015] Step 10, cleaning oil stains: cleaning the product in step 9;

[0016] Step 11, drying: drying the product of step 10;

[0017] Step 12: Full inspection and packaging: Inspect the products in step 11 to obtain the final qualified products and package them.

[0018] Preferably, the material of the sheet is AL1060.

[0019] Preferably, during the polymer diffusion welding in step 2, the same position is welded three times, and the pressure is maintained once each time, wherein the first welding + pressure holding time is 10s, the second welding + pressure holding time is 8s, and the third welding + pressure holding time is 6s.

[0020] Preferably, in step three, the long side segment and the short side segment form an angle of 90°.

[0021] Preferably, during the polymer diffusion welding in step 4, the same position is welded three times, and the pressure is maintained once each time, wherein the first welding + pressure holding time is 10s, the second welding + pressure holding time is 8s, and the third welding + pressure holding time is 6s.

[0022] Furthermore, the widths of the trimmings in step six, step eight and step nine are equal.

[0023] Furthermore, in step eight, the special-shaped hole is located on the midline of the long side segment along the long side, and the position of the special-shaped hole corresponds to the position of the countersunk heads on both sides.

[0024] Furthermore, in step nine, a circular hole is punched and located on the midline of the short side segment along the long side.

[0025] Furthermore, in step eight and step nine, the corners of the long side segments and the short side segments of the product are rounded respectively.

[0026] Beneficial effects of the present invention:

[0027] The product manufactured by the present invention forms a soft connection at the bending part, forming a buffer zone, which protects the solder joint from falling off easily; in addition, a countersunk structure is punched out on the long side section, and the position of this countersunk structure is the welding area, which can prevent the solder joint from being too high during subsequent welding, causing the solder joint to contact the shell after assembly and cause a short circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a process flow chart of the present invention;

[0029] Figure 2 It is a schematic diagram of the material structure in the present invention;

[0030] Figure 3 This is a schematic diagram of the product structure in step 2 of the present invention;

[0031] Figure 4 This is a schematic diagram of the product structure in step three of the present invention;

[0032] Figure 5 This is a schematic diagram of the product structure in step 4 of the present invention;

[0033] Figure 6 This is a schematic diagram of the product structure in step six of the present invention;

[0034] Figure 7 This is a schematic diagram of the product structure in step seven of the present invention;

[0035] Figure 8 This is a schematic diagram of the product structure in step eight of the present invention;

[0036] Fig. 9 This is a schematic diagram of the product structure in step nine of the present invention;

[0037] In the figure: 1 short side segment, 2 long side segment, 3 bending point, 4 countersunk head, 5 positioning hole, 6 special-shaped hole, 7 round hole. DETAILED DESCRIPTION

[0038] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only preferred embodiments of the present application, rather than all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0039] refer to Figure 1 , a method for making a battery soft connection, which includes the following specific steps:

[0040] Step 1, cutting: In this application, the preferred material is AL1060 rolled aluminum sheet to cut into required sheets. In this embodiment, the width of the sheet can be selected according to the width of the final product of the flexible connection plus 2.0mm on one side, and the cutting length is based on the actual length of the final product of the flexible connection plus 10mm margin. A special slicer is used for cutting, and the slicer speed is adjustable from 10-99R / S. By controlling the speed, sheets of different lengths can be cut, and the speed is controlled to be constant when cutting sheets of the same length.

[0041] Step 2: Polymer diffusion welding short side: Take several pieces of material and stack them, such as Figure 3As shown, a line is drawn on the topmost sheet, and the sheet is divided into a long side segment 2 and a short side segment 1 by drawing a line, and the short side segment 1 is subjected to polymer diffusion welding. The power of the polymer diffusion welding machine is 80KW, the set temperature is 618℃, the current is 38A, and the pressure is 6T. When welding, the short side segment is placed in the polymer diffusion welding machine, and the short side segment 1 is welded in the same position, and welded 3 times, and the pressure is maintained once each time, wherein the first welding + pressure maintenance time is: 10 seconds; the second welding + pressure maintenance time is: 8 seconds, and the third welding + pressure maintenance time is: 6 seconds, so that the short side segments 1 of all the sheets are welded together. In this embodiment, the stacking thickness of the sheet is 2mm, and when the single-layer thickness of the sheet is 0.1mm, 20 layers need to be stacked; the single-layer thickness of the sheet is 0.2mm, 10 layers are required.

[0042] Step 3, pre-bending: refer to Figure 4 , the product in step 2 is then passed through a 16T punch Figure 3 Bend 90° at the center line.

[0043] Step 4, polymer diffusion welding long side: polymer diffusion welding is performed on the long side segment 2 of the product in step 3. The power of the polymer diffusion welding machine is 80KW, the set temperature is 618℃, the current is 38A, and the pressure is 6T. When welding, the long side segment 2 is placed in the polymer diffusion welding machine, and the long side segment 2 is welded in the same position for 3 times, and the pressure is maintained for 1 time each time, wherein the first welding + pressure maintenance time is: 10 seconds; the second welding + pressure maintenance time is: 8 seconds, and the third welding + pressure maintenance time is: 6 seconds, so as to weld the long side segments 2 of all the sheets together. Among them, the bend 3 is not welded to maintain the layered structure.

[0044] Step 5, long side shaping: shaping the long side segments of the product in step 4. When high-resolution diffusion welding is performed on the long side segment 2 in step 4, due to the long length of the long side segment 2, there is a situation where the long side segment 2 is partially arched after welding. At this time, the long side segment 2 needs to be placed in a shaping tool for shaping, and the long side segment 2 needs to be trimmed until the surface is smooth and the whole is straight.

[0045] Step 6: Pre-cut at the layer: refer to Figure 5 , 6 , put the product shaped in step 5 into the profiling fixture and completely fit it. The profiling fixture has a 90° angle protrusion feature to facilitate the fitting of the soft connection bending part. The profiling fixture has 90° protrusion features on both sides to fix the product and prevent the product from moving during punching. Start the punch press to punch both sides of the bend 3. The punching width is based on the width added in step 1. In this embodiment, it is 2mm. The punch press tonnage is 16T.

[0046] Step 7: Punch countersunk head and positioning hole: refer to Figure 7, the product in step 6 is placed on the fixing fixture of the 200T punch press, and the punches required for punching the countersunk head and the positioning hole are successively installed on the 200T punch press, and the countersunk head 4 and the auxiliary positioning hole 5 with a depth of 0.5mm are successively formed. Among them, the depth of the countersunk head 4 can be selected according to the thickness of different products, and 0.5mm is the preferred depth in this embodiment. The positioning hole 5 penetrates the product to assist the positioning function during the forming step 8.

[0047] In reference Figure 7 The countersunk heads 4 are symmetrically arranged along the long side segment 2 , and two symmetrically distributed countersunk heads 4 form a group. The distance between each group of countersunk heads 4 is reasonably arranged according to the number of battery cells to be connected and the length of the long side segment 2 .

[0048] Step 8: Punch special-shaped holes and trim the edges on the long side: refer to Figure 7 , 8 , place the product in step 7 on the fixture of a 25T punching machine, install the punch for punching special-shaped holes on the 25T punching machine, start the punching machine to punch special-shaped holes 6 on the long side section 2 as liquid seepage holes, and let the electrolyte flow into the battery cell through the liquid seepage holes. The special-shaped holes 6 are preferably as follows Figure 8 The structure shown is a circular hole in the middle, with long strip holes connected on both sides of the circular hole. The special-shaped holes 6 are located on the midline of the long side section 2 along the long side, and each special-shaped hole 6 corresponds to a group of countersunk heads 4. Then, the punch is replaced to punch the two sides of the long side section 2, and the punching width is the same as the width added in step 1, which is 2 mm in this embodiment.

[0049] Step 9, short side punching and trimming: refer to Figure 8 , 9 , place the product in step 8 on the fixture of a 16T punching machine, install the punch on the 16T punching machine, punch out a circular hole 7 on the short side segment 1, and the circular hole 7 passes through the product. Then replace the punch to punch both sides of the short side segment 1. The punching width is based on the width added in step 1, which is 2 mm in this embodiment. The circular hole 7 is located on the midline of the short side segment 1 along the long side.

[0050] Step 10, cleaning grease: put cleaning solution into the cleaning pool, the ratio of cleaning solution to water is 1:5 (volume ratio); (the ingredients of the solution are a mixture of detergent and special agent for cleaning aluminum parts) put the product in step 9 and soak for 10 minutes, then take out the product and rinse it with clean water.

[0051] Step 11, drying: put the products rinsed in step 10 into the dryer, set the temperature to 120-150 degrees, and start baking for 5 minutes.

[0052] Step 12, full inspection and packaging: Inspect the final product size and appearance according to the drawings and issue a test report, and finally pack it.

[0053] It should be noted that the tonnage of the above punch presses is the optimal choice for this embodiment, and those skilled in the art can select the appropriate tonnage according to actual needs. In addition, those skilled in the art can design the above shaping tooling and various fixtures based on existing technical means and the product of this application, and can also adopt other existing technical means to achieve it.

Claims

1. A method for manufacturing a battery soft connection, characterized in that: The steps include: Step 1: Cutting: Cutting sheets of fixed length and width; Step 2: polymer diffusion welding of short edges: stack several sheets of material, draw a line on the top sheet, divide the sheet into long edge segments and short edge segments by drawing a line, perform polymer diffusion welding on the short edge segments, and weld the short edge segments of all sheets together; Step 3, pre-bending: bend the product in step 2 along the marked line so that the short side segment and the long side segment form a certain angle; Step 4: Polymer diffusion welding long side: polymer diffusion welding is performed on the long side segments of the product in step 3, and the long side segments of all the sheets are welded together, and the bending parts are not welded; Step 5, long side shaping: shaping the long side of the product in step 4; Step 6: Pre-cutting at the layering: trimming the edges on both sides of the bending part of the product in step 4; Step 7, punching countersunk heads and positioning holes: punching a plurality of sets of countersunk heads symmetrically on both sides of the long side of the product in step 6, and punching positioning holes at the end of the product away from the bending part; Step 8, punching special-shaped holes and trimming the long side: punching a number of special-shaped holes as liquid seepage holes on the product in step 7, and trimming the long side of the product on both sides; Step 9, short side punching and trimming: punching holes on the short side of the product in step 8, and trimming both sides of the short side of the product; Step 10, cleaning oil stains: cleaning the product in step 9; Step 11, drying: drying the product of step 10; Step 12: Full inspection and packaging: Inspect the products in step 11 to obtain the final qualified products and package them.

2. A method for manufacturing a battery flexible connection according to claim 1, characterized in that: The material of the sheet is AL1060.

3. A method for manufacturing a battery flexible connection according to claim 1, characterized in that: During the polymer diffusion welding in step 2, the same position is welded three times, and the pressure is maintained once each time. The first welding + pressure holding time is 10 seconds, the second welding + pressure holding time is 8 seconds, and the third welding + pressure holding time is 6 seconds.

4. A method for manufacturing a battery flexible connection according to claim 1, characterized in that: In the step three, the long side segment and the short side segment form an angle of 90°.

5. A method for manufacturing a battery flexible connection according to claim 1, characterized in that: During the polymer diffusion welding in step 4, the same position is welded three times, and the pressure is maintained once each time. The first welding + pressure holding time is 10 seconds, the second welding + pressure holding time is 8 seconds, and the third welding + pressure holding time is 6 seconds.

6. A method for manufacturing a battery flexible connection according to claim 1, characterized in that: The widths of the trimmings in step six, step eight and step nine are equal.

7. A method for manufacturing a battery flexible connection according to claim 1, characterized in that: In the step eight, the special-shaped hole is located on the midline of the long side segment along the long side, and the position of the special-shaped hole corresponds to the position of the countersunk heads on both sides.

8. A method for manufacturing a battery flexible connection according to claim 1, characterized in that: In the step nine, a circular hole is punched, and the circular hole is located on the midline of the short side segment along the long side.

9. A method for manufacturing a battery flexible connection according to claim 1, characterized in that: In the steps eight and nine, the corners of the long side segments and the short side segments of the product are rounded respectively.

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