Collecting disc structure

Abstract

The utility model relates to the technical field of batteries, and discloses a collector plate structure which comprises a shell assembly, a pole is arranged in the center of the top of the shell assembly, a collector plate is welded to the top of the inner side of the shell assembly, a middle protruding face is arranged in the center of the top face of the collector plate, and a middle thinning groove is formed in the top face of the middle protruding face. According to the utility model, after the through hole of the pole mentioned in the step 3 and the collector plate are assembled, a welding position is formed at the contact part, and then laser landing edge welding is carried out, so that a battery manufacturer can ensure high quality and high reliability of a battery assembly by adopting a laser landing edge welding technology; and meanwhile, the production efficiency is improved, the cost is reduced, laser welding becomes one of the preferred welding technologies in the battery manufacturing industry through the advantages, and the beneficial effects of improving the production efficiency and controlling the cost are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a current collecting disc structure. Background Art

[0002] At present, there are two main ways to connect the positive current collector and the positive electrode column for large cylindrical batteries, one is ultrasonic torque welding and the other is laser welding.

[0003] Ultrasonic torque welding has low production efficiency, high welding needle cost and short life. From the perspective of production cost, it is not suitable for mass production. Laser welding has high production efficiency and simple equipment maintenance, so it is widely used in lithium battery production.

[0004] Laser welding can be divided into many types according to the relative position of the welding part and the welded part, such as penetration welding, lap welding, butt welding, etc. Among them, penetration welding is mostly used for welding the positive collector and the positive electrode pole. However, the disadvantage of penetration welding is that the welding quality of the welding part and the welded part cannot be detected after welding, and after adopting this structure, if the injection hole is set on the pole, it will cause welding slag to fall into the battery from the injection hole, thereby affecting the battery performance.

[0005] Therefore, the utility model proposes a lap welding structure to solve the problem that the welding quality cannot be detected. At the same time, the injection hole is arranged on the pole to prevent welding slag from falling into the battery. Utility Model Content

[0006] In view of the shortcomings of the prior art, the utility model provides a collecting plate structure, which has the advantages of being able to detect welding quality and prevent welding slag from falling into the battery during laser welding, thereby solving the problem of being unable to detect welding quality. At the same time, the liquid injection hole is set on the pole, and the problem of welding slag falling into the battery is prevented.

[0007] In order to achieve the above-mentioned purpose of being able to detect the welding quality and prevent welding slag from falling into the battery during laser welding, the utility model provides the following technical solutions: a current collecting plate, including a shell assembly, a pole is arranged at the top center of the shell assembly, a current collecting plate is welded on the top of the inner side of the shell assembly, a middle raised surface is arranged at the center of the top surface of the current collecting plate, a middle thinning groove is arranged on the top surface of the middle raised surface, and a cross notch is arranged on the top surface of the middle thinning groove.

[0008] Preferably, the basic structure is as follows: a welded overlap is installed on the top of the current collecting disk and below the pole, and a winding core is installed below the current collecting disk.

[0009] Preferably, a through hole is opened in the middle of the pole, and the through hole has two options A and B. A is a through hole with a uniform diameter, and B is a through hole with different step diameters. The diameter of the through hole in contact with the collecting disk is smaller than the outer diameter of the protrusion on the collecting disk.

[0010] Preferably, the material of the collecting plate is the same as that of the pole, and the material is one of aluminum, steel, copper and other metal materials.

[0011] Preferably, after the through hole of the pole is assembled with the current collecting plate, a welding position is formed at the contact point thereof, and laser lap welding is performed.

[0012] Preferably, the collecting plate is designed with a protrusion in the middle, and a blind hole is provided in the middle of the protrusion; a cross notch is provided at the position of the blind hole.

[0013] Preferably, the upper surface of the middle raised surface is an arc surface, so as to ensure better contact with the pole through hole during assembly.

[0014] Preferably, the cross notch is in a cross shape or a C shape.

[0015] Preferably, the cross notch is pierced with a tool to become a through hole before liquid injection, and used as a liquid injection hole.

[0016] Compared with the prior art, the utility model provides a collecting plate structure, which has the following beneficial effects:

[0017] 1. After the through hole of the pole is assembled with the collector plate, the utility model forms a welding position at the contact point, and then performs laser lap welding. This design and process bring the following advantages: Improve welding efficiency: Laser lap welding is a high-speed and high-efficiency welding technology that can complete high-quality welding work in a short time, thereby improving overall production efficiency; Enhance welding accuracy: Laser welding technology can achieve very fine welding, which means that the welding position and weld size can be accurately controlled to ensure the consistency and reliability of welding quality; Reduce heat-affected zone: The heat-affected zone generated by laser welding is smaller, which helps to maintain the structural integrity and stability of the battery assembly and reduce material deformation or performance degradation caused by overheating; Avoid pollution: Since laser welding is a non-contact welding method, it does not produce residues such as welding slag, which helps to maintain the battery inside Clean the inside of the battery to avoid internal contamination; Improve welding strength: Laser lap welding can achieve high-strength welded joints, which is crucial for the long-term reliability and stability of the battery, especially when subjected to vibration or impact; Simplify subsequent processes: Due to the high precision and high quality of laser welding, it helps to reduce subsequent welding inspections and repairs, thereby simplifying the production process and reducing manufacturing costs; Good adaptability: Laser welding technology is suitable for a variety of materials and thicknesses, which makes it very flexible in battery manufacturing and can adapt to different design requirements. By adopting laser lap welding technology, battery manufacturers can ensure the high quality and reliability of battery components while improving production efficiency and reducing costs. The above advantages make laser welding one of the preferred welding technologies in the battery manufacturing industry, and its use has achieved the beneficial effects of improving production efficiency and cost control.

[0018] 2. The utility model uses a cross notch, that is, a pre-designed puncturable blind hole on the positive current collecting plate, which is punctured into a through hole using a specific tool before injection to serve as an injection hole. The advantages of this process are as follows: Precise control: By presetting the notch position and size, the position and size of the injection hole can be precisely controlled to ensure the accuracy and consistency of the injection process; Avoid contamination: After the notch is punctured, the material of the blind hole is designed not to fall off, thus avoiding internal contamination during battery assembly or injection, keeping the battery clean and reducing the risk of battery performance degradation; Simplify the process: This step integrates multiple processes in the manufacturing process. For example, the step of making a separate injection hole is omitted because the notch has been designed to be It can be quickly converted into an injection hole when needed; Improve production efficiency: This design allows the injection holes to be made quickly and in batches, because no additional cutting or drilling operations are required, saving time and improving overall production efficiency; Enhance structural integrity: The material around the notch remains in place after being punctured, which helps maintain the structural integrity of the collector plate and avoids cracks or deformation caused by traditional drilling methods; Reduce manufacturing costs: The need for additional equipment and process steps is reduced, thereby reducing the overall battery manufacturing cost. In summary, the cross-notch design provides an efficient, economical and environmentally friendly solution for creating injection holes in the battery manufacturing process, while achieving beneficial effects on the quality and reliability of battery products. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a front cross-sectional view of the housing assembly of the utility model;

[0020] Figure 2 This is a front cross-sectional view of the current collecting plate of the utility model;

[0021] Figure 3 This is a top view of the current collecting plate of the utility model;

[0022] Figure 4 This is a flow chart of the welding method of the utility model.

[0023] Among them: 1. Shell assembly; 101. Pole; 102. Through hole; 2. Collector plate; 201. Middle raised surface; 202. Middle thinning groove; 203. Cross notch; 3. Winding core; 4. Welding overlap. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] Specifically, a current collecting plate includes a shell component 1, a pole 101 is arranged at the top center of the shell component 1, a current collecting plate 2 is welded on the inner top of the shell component 1, a middle raised surface 201 is arranged at the top center of the current collecting plate 2, a middle thinning groove 202 is arranged on the top surface of the middle raised surface 201, and a cross notch 203 is arranged on the top surface of the middle thinning groove 202.

[0026] Specifically, the basic structure is as follows: a welding overlap 4 is installed on the top of the current collecting plate 2 and below the pole 101 , and a winding core 3 is installed below the current collecting plate 2 .

[0027] Specifically, the welding method includes the following steps:

[0028] Step 1: Current collector plate welding: The positive end of the current collector plate 2 and the winding core 3 are first laser welded;

[0029] Step 2: Insert into the shell: Then assemble the coil core with the current collecting plate welded on it, with the positive electrode facing inward, onto the shell assembly 1, and ensure that the middle raised surface 201 is in good contact with the inner bottom surface of the through hole 102;

[0030] Step 3: Overlap welding: laser welding is performed on the overlap 4;

[0031] Step 4: Welding the negative electrode collector plate and the steel shell of the battery and welding the cover plate;

[0032] Step 5: Puncture the blind hole: Use a steel rod or a rod made of other materials to puncture the cross mark 203;

[0033] Step 6: Inject liquid into the battery from the punctured hole.

[0034] Step 7: seal and weld the injection hole;

[0035] Step 8: Clean, oil, heat shrink and inkjet the battery;

[0036] Step 9. The battery is completed.

[0037] Specifically, the pole 101 has a through hole in the middle, and the through hole 102 has two options, A and B. A is a through hole with a uniform diameter, and B is a through hole with different step diameters, but the diameter of the side in contact with the collecting disk is smaller than the outer diameter of the protrusion on the collecting disk.

[0038] Specifically, the material of the collecting plate 2 is the same as that of the pole 101 , and the material is one of aluminum, steel, copper and other metal materials.

[0039] Specifically, after the through hole 102 of the pole 101 and the current collecting plate 2 are assembled in step 3, a welding position is formed at the contact point thereof, and laser lap welding is performed.

[0040] The advantage is that after the through hole 102 of the pole 101 mentioned in step three is assembled with the collecting plate 2, a welding position is formed at the contact point, and then laser lap welding is performed. This design and process brings the following advantages: Improve welding efficiency: Laser lap welding is a high-speed and high-efficiency welding technology that can complete high-quality welding work in a short time, thereby improving overall production efficiency; Enhance welding accuracy: Laser welding technology can achieve very fine welding, which means that the welding position and weld size can be accurately controlled to ensure the consistency and reliability of welding quality; Reduce heat-affected zone: The heat-affected zone generated by laser welding is smaller, which helps to maintain the structural integrity and stability of the battery assembly and reduce material deformation or performance degradation caused by overheating; Avoid pollution: Since laser welding is a non-contact welding method, it does not produce residues such as welding slag, which It helps to keep the inside of the battery clean and avoid internal contamination; improve welding strength: laser lap welding can achieve high-strength weld joints, which is crucial for the long-term reliability and stability of the battery, especially when subjected to vibration or impact; simplify subsequent processes: due to the high precision and high quality of laser welding, it helps to reduce subsequent welding inspections and repairs, thereby simplifying the production process and reducing manufacturing costs; good adaptability: laser welding technology is suitable for a variety of materials and thicknesses, which makes it very flexible in battery manufacturing and can adapt to different design requirements. By adopting laser lap welding technology, battery manufacturers can ensure the high quality and reliability of battery components while improving production efficiency and reducing costs. The above advantages make laser welding one of the preferred welding technologies in the battery manufacturing industry, and its use has achieved the beneficial effects of improving production efficiency and cost control.

[0041] Specifically, the collecting plate 2 is designed with a protrusion in the middle, and a blind hole is located in the middle of the protrusion; a cross notch 203 is provided at the blind hole.

[0042] Specifically, the upper surface of the middle raised surface 201 is an arc surface, which ensures better contact with the pole through hole during assembly.

[0043] Specifically, the cross notch 203 is in a cross shape or a C shape.

[0044] Specifically, the cross notch 203 in step five is punctured by a tool before injection to become a through hole for use as an injection hole; after the notch is punctured, the material of the blind hole will not fall off.

[0045] The advantage is that the utility model uses the cross notch 203 mentioned in step five, that is, a pre-designed puncturable blind hole on the positive current collecting plate, which is punctured into a through hole using a specific tool before injection to serve as an injection hole. The advantages of this process are as follows: Precise control: By presetting the notch position and size, the position and size of the injection hole can be precisely controlled to ensure the accuracy and consistency of the injection process; Avoid contamination: After the notch is punctured, the material of the blind hole is designed not to fall off, thus avoiding internal contamination during battery assembly or injection, keeping the battery clean and reducing the risk of battery performance degradation; Simplify the process: This step integrates multiple steps in the manufacturing process. For example, the step of making a separate injection hole is omitted because the notch has been Designed to be quickly converted into injection holes when needed; Improve production efficiency: This design allows the injection holes to be made quickly and in batches because no additional cutting or drilling operations are required, saving time and improving overall production efficiency; Enhance structural integrity: The material around the notch remains in place after being punctured, which helps maintain the structural integrity of the collector plate and avoids cracks or deformation caused by traditional drilling methods; Reduce manufacturing costs: The need for additional equipment and process steps is reduced, thereby reducing the overall battery manufacturing cost. In summary, the notch design in step five provides an efficient, economical and environmentally friendly solution for creating injection holes in the battery manufacturing process, while achieving beneficial effects on the quality and reliability of battery products. Example

[0046] Figure 1-3 is a diagram of Example 1

[0047] S1.1, the core is made through homogenization, coating, rolling, slitting, winding and flattening;

[0048] S1.2. Weld the positive and negative collector plates onto the winding core;

[0049] S1.3. Roll the core into the shell and perform laser lap welding on the contact position between the collector plate and the pole from the pole through hole;

[0050] S1.4. Weld the negative electrode collector plate and the steel shell of the battery, and weld the cover plate;

[0051] S1.5. Use a plastic rod to puncture the blind hole of the collector plate;

[0052] S1.6. Inject the electrolyte into the punctured hole.

[0053] S1.7, perform sealing welding on the injection hole;

[0054] S1.8, clean and oil the battery, perform heat shrinking and inkjet printing;

[0055] S1.9, the battery is manufactured.

[0056] Comparative Example 1

[0057] S2.1, the core is made by homogenization, coating, rolling, slitting, winding and flattening;

[0058] S2.2, weld the positive and negative collector plates onto the winding core;

[0059] S2.3. Roll the core into the shell and perform overlapping arc welding on the contact position between the collector plate and the pole from the pole through-hole;

[0060] S2.4. Weld the negative electrode collector plate and the steel shell of the battery, and weld the cover plate;

[0061] S2.5. Use a plastic rod to puncture the blind hole of the collector plate;

[0062] S2.6, inject the electrolyte into the punctured hole;

[0063] S2.7, perform sealing welding on the injection hole;

[0064] S2.8, clean and oil the battery, perform heat shrinking and inkjet printing;

[0065] S2.9, the battery is manufactured.

[0066] Comparative Example 2

[0067] S3.1, the core is made by homogenization, coating, rolling, slitting, winding and flattening;

[0068] S3.2, weld the positive and negative collector plates onto the winding core;

[0069] S3.3. Roll the core into the shell and perform laser lap welding on the contact position between the collector plate and the pole from the pole through hole;

[0070] S3.4. Weld the negative electrode collector plate and the steel shell of the battery, and weld the cover plate;

[0071] S3.5, clean and oil the battery, perform heat shrinking and inkjet printing;

[0072] S3.6, the battery is manufactured.

[0073] 1. Embodiment 1 ensures welding quality through relevant detection means, and effectively solves the problem of welding slag falling into the battery during laser welding by specially designing a puncturable blind hole on the positive current collecting plate as a liquid injection hole, thereby improving the safety and reliability of the battery.

[0074] Second, in contrast, Comparative Example 1 describes a method of overlapping arc welding using electrodes. Although this is a traditional welding technique, it does not mention any measures for detecting welding quality, nor does it address the risk of welding slag falling into the battery during welding.

[0075] 3. Comparative Example 2 points out a situation in which no puncturable blind hole is provided on the current collecting plate as a liquid injection hole. This means that even if welding slag is generated during the laser welding process, there is no special mechanism to prevent the welding slag from entering the battery, which leads to a decrease in battery performance and even safety hazards.

[0076] In summary, the laser lap welding structure of Example 1 shows obvious technical advantages compared with the electrode lap arc welding (Comparative Example 1) and Comparative Example 2 (collecting plate without injection holes), especially in improving battery safety and quality inspection.

[0077] Although embodiments of the present invention have been shown and described, it is understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A collecting plate structure, comprising a housing assembly (1), characterized in that: A pole (101) is arranged at the top center of the shell component (1), a current collecting plate (2) is welded at the inner top of the shell component (1), a middle raised surface (201) is arranged at the top center of the current collecting plate (2), a middle thinning groove (202) is arranged on the top of the middle raised surface (201), and a cross notch (203) is arranged on the top of the middle thinning groove (202).

2. A current collecting plate structure according to claim 1, characterized in that: A welding overlap (4) is installed on the top of the current collecting plate (2) and below the pole (101), and a winding core (3) is installed below the current collecting plate (2).

3. A current collecting plate structure according to claim 2, characterized in that: A through hole (102) is provided in the middle of the pole (101), and the diameter of the through hole (102) on the contact side with the current collecting disk is smaller than the outer diameter of the protrusion on the current collecting disk.

4. A current collecting plate structure according to claim 3, characterized in that: After the through hole (102) of the pole (101) and the current collecting plate (2) are assembled, a welding position is formed at the contact point and laser lap welding is performed.

5. A current collecting plate structure according to claim 4, characterized in that: The collecting plate (2) is designed with a protrusion in the middle, and a blind hole is located in the middle of the protrusion; a cross notch (203) is provided at the position of the blind hole.

6. A current collecting plate structure according to claim 5, characterized in that: The upper surface of the middle raised surface (201) is an arc surface, which is used to ensure better contact with the pole through hole during assembly.

7. A current collecting plate structure according to claim 6, characterized in that: The cross notch (203) is in a cross shape or a C shape.

8. A current collecting plate structure according to claim 7, characterized in that: The cross notch (203) is pierced by a tool before liquid injection to become a through hole, which is used as a liquid injection hole.

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