Processing method of novel single-pass aluminum shell cylindrical battery structure

Abstract

The invention belongs to the technical field of batteries, particularly relates to a processing method of a novel single-pass aluminum shell cylindrical battery structure, and provides the following scheme: the processing method comprises the following steps: step 1, welding a negative current collecting disc on the end surface of a tab; step 2, folding for the first time along a folding mark on the end surface of the collector plate; 3, the roll core is placed in the single-pass shell, and penetration welding is conducted on a reinforcing rib welding area at the bottom of the single-pass shell; step 4, carrying out secondary folding on the joint of the conductive handle and the negative electrode cover plate along the folding mark; step 5, performing circumferential welding on the negative electrode cover plate; step 6, welding at the positive electrode end by adopting a sealing nail; a battery structure used by the processing method comprises a single-pass shell, and a roll core is mounted in the single-pass shell. According to the processing method, the number of welding procedures of the technological process is small, positive electrode collector plate welding and positive electrode penetration welding are combined into one welding procedure, a shell bottom is replaced by a positive electrode collector plate, and the processing efficiency and the yield are remarkably improved.

Description

Technical Field

[0001] The invention relates to the technical field of batteries, and in particular to a processing method for a novel single-pass aluminum shell cylindrical battery structure. Background Art

[0002] At present, there are many welding processes for large cylindrical batteries, including negative collector plate welding, positive collector plate welding, penetration welding, sealing nail welding, and cover plate circumference welding. The many welding processes result in low process yield, low efficiency, and high cost. Moreover, most of them are eccentric injection. At present, most of the ear processing methods on the market are flattening methods. The flattened end surface is compacted, so it is difficult to inject liquid, which increases the battery process time and has low efficiency. Therefore, the present invention proposes a new processing method for single-pass aluminum shell cylindrical battery structure to solve the above problems. Summary of the invention

[0003] Based on the technical problems that many welding processes lead to low process yield, low efficiency and high cost, and most of them are eccentric injection, and most of the tab processing methods on the market are flattening, which makes the flattened end surface tight and difficult to inject and infiltrate, increasing the battery process time and low efficiency, the present invention proposes a new processing method for a single-pass aluminum shell cylindrical battery structure.

[0004] The present invention proposes a novel processing method for a single-pass aluminum shell cylindrical battery structure, comprising the following steps: Step 1, welding the negative electrode current collector to the end surface of the pole lug; Step 2, performing the first folding along the folding mark on the end surface of the collector plate; Step 3, placing the coil core into the single-pass shell, and performing penetration welding on the reinforcement rib welding area at the bottom of the single-pass shell; Step 4, folding the conductive handle and the negative electrode cover plate for the second time along the folding mark; Step 5, performing circumferential welding on the negative electrode cover; Step 6, welding with sealing nails at the positive end; The battery structure used in the processing method includes: a single-pass shell, a winding core is installed in the single-pass shell, and a negative electrode cover plate is arranged above the single-pass shell and sealed by a sealing nail.

[0005] Preferably, the battery is a cylindrical battery.

[0006] Preferably, the battery center is filled with liquid.

[0007] Preferably, a reinforcing rib groove is integrally formed inwardly at the bottom of the single-pass shell.

[0008] Preferably, the thickness of the negative electrode current collecting disk is 0.2-0.4 mm.

[0009] The beneficial effects of the present invention are: The single-pass shell has high structural strength, good thermal conductivity and low cost; Fewer structural parts and lower cost; The present invention has fewer welding steps in the process flow, combines the positive electrode current collecting plate welding and the positive electrode penetration welding into one welding step, replaces the shell bottom with the positive electrode current collecting plate, and significantly improves the process efficiency and yield. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 This is a three-dimensional schematic diagram of the structure of a novel single-pass aluminum shell cylindrical battery structure proposed by the present invention; Figure 2 A schematic diagram of a front view of a single-pass shell of a novel single-pass aluminum shell cylindrical battery structure proposed by the present invention; Figure 3 A schematic top view of a negative electrode cover plate of a novel single-pass aluminum shell cylindrical battery structure proposed by the present invention; Figure 4 A bottom view schematic diagram of a structural single-pass shell of a novel single-pass aluminum shell cylindrical battery structure proposed by the present invention; Figure 5 This is an enlarged schematic diagram of the bottom of a structural single-pass shell of a novel single-pass aluminum shell cylindrical battery structure proposed by the present invention; Figure 6 A bottom view schematic diagram of a negative electrode cover plate of a novel single-pass aluminum shell cylindrical battery structure proposed by the present invention; Figure 7 A bottom-up schematic diagram of a negative electrode current collector of a novel single-pass aluminum shell cylindrical battery structure proposed by the present invention; Figure 8 A schematic top view of a negative electrode current collector of a novel single-pass aluminum shell cylindrical battery structure proposed by the present invention; Fig. 9 A schematic diagram of the front view of a negative electrode cover plate of a novel single-pass aluminum shell cylindrical battery structure proposed by the present invention; Fig.10 The invention proposes a novel single-pass aluminum shell cylindrical battery structure. Fig. 9 Middle A is an enlarged schematic diagram; Fig.11 This is a three-dimensional schematic diagram of the main view and cross-section of a novel single-pass aluminum shell cylindrical battery structure proposed by the present invention: Fig.12 This is a simulation diagram of a processing method for a novel single-pass aluminum shell cylindrical battery structure proposed by the present invention: Fig.13 The present invention is a flowchart of a novel processing method for a single-pass aluminum shell cylindrical battery structure.

[0011] In the figure: 1. Single-pass shell; 2. Negative electrode cover plate; 3. Sealing pin; 4. Winding core; 5. Negative electrode collector plate. DETAILED DESCRIPTION

[0012] The present invention will be further explained below in conjunction with specific embodiments.

[0013] refer to Figure 1-13 In this embodiment, a novel processing method of a single-pass aluminum shell cylindrical battery structure is proposed, comprising the following steps: Step 1, welding the negative electrode current collector 5 to the end surface of the pole lug; Step 2, performing the first folding along the folding mark on the end surface of the collector plate; Step 3, placing the winding core 4 into the single-pass shell 1, and performing penetration welding on the reinforcement rib welding area at the bottom of the single-pass shell 1; Step 4, folding the conductive handle and the negative electrode cover plate 2 along the folding mark for the second time; Step 5, performing circumferential welding on the negative electrode cover plate 2; Step 6, welding with sealing nail 3 at the positive end; The battery structure used in the processing method includes: a single-pass shell 1, a winding core 4 is installed in the single-pass shell 1, a negative electrode cover plate 2 is arranged above the single-pass shell 1, and is sealed by a sealing nail 3.

[0014] In this embodiment, the battery is a cylindrical battery.

[0015] In this embodiment, liquid is injected into the center of the battery.

[0016] In this embodiment, a reinforcing rib groove is integrally formed inwardly at the bottom of the single-pass shell 1 .

[0017] In this embodiment, the thickness of the negative electrode current collecting disk 5 is 0.2-0.4 mm.

[0018] Working principle: The negative electrode current collector 5 is welded to the bottom of the negative electrode cover 2, and the first folding is performed along the folding mark on the end face of the current collector. The winding core 4 is placed inside the single-pass shell 1, and the bottom reinforcement rib welding area of ​​the single-pass shell 1 is penetrated and welded. A second folding is performed along the folding mark at the connection between the conductive handle and the cover. The circumference of the negative electrode cover 2 is welded to the single-pass shell 1, and the sealing pin 3 is welded to the bottom of the single-pass shell 1. The battery is a single-pass battery, the center of the battery is filled with liquid, and the battery has no positive electrode current collector structure.

[0019] The following are the parameter data of this application: As shown in the figure below, through thermal simulation results: the heat transfer speed of single-pass battery cells is faster than that of dual-pass battery cells. Compared with modules, single-pass heat dissipation efficiency is higher.

[0020] As shown in the figure below, through the mechanical simulation results, the explosion pressure resistance of the single-channel battery is better than that of the double-channel battery.

[0021] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A novel processing method for a single-pass aluminum shell cylindrical battery structure, characterized in that: The steps include: Step 1, welding the negative electrode current collector (5) onto the end surface of the electrode lug; Step 2, performing the first folding along the folding mark on the end surface of the collector plate; Step 3, placing the winding core (4) into the single-pass shell (1), and performing penetration welding on the reinforcement rib welding area at the bottom of the single-pass shell (1); Step 4, folding the conductive handle and the negative electrode cover plate (2) for a second time along the folding mark at the connection point; Step 5, performing circumferential welding on the negative electrode cover plate (2); Step 6, welding with a sealing nail (3) at the positive end; The battery structure used in the processing method comprises: a single-pass shell (1), a winding core (4) is installed in the single-pass shell (1), and a negative electrode cover plate (2) is arranged above the single-pass shell (1) and is sealed by a sealing pin (3).

2. The processing method according to claim 1, characterized in that: The battery is a cylindrical battery.

3. The processing method according to claim 1, characterized in that: The battery center is filled with liquid.

4. The processing method according to claim 1, characterized in that: The bottom of the single-pass shell (1) is integrally formed with a reinforcing rib groove facing inward.

5. The processing method according to claim 1, characterized in that: The thickness of the negative electrode current collecting disc (5) is 0.2-0.4 mm.

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