A production process of a battery cover plate

Abstract

This invention relates to a manufacturing process for a battery cover plate, comprising the following steps: immersing the cover plate and electrode post in an alkaline solution for degreasing, followed by nano-sizing to form nanoscale uneven pits on the surface; then immersing them in a passivation solution for passivation to form a passivation film on the surface; and finally sealing the micropores to obtain the finished cover plate and electrode post. b. The assembly process of the cover plate and electrode post is as follows: placing the pre-treated electrode post on a pre-set fixture and heating the electrode post to a pre-set temperature; punching the resin film to obtain film 1; placing film 1 on the heated electrode post for positioning and bonding; continuously heating the electrode post until film 1 softens, causing the electrode post to naturally press down, allowing film 1 to wrap around the electrode post, thus obtaining electrode post 1; step five: naturally cooling the electrode post 1 to a pre-set temperature to obtain electrode post coated with adhesive 1. This process is simple, significantly improves the yield of finished products, and is very safe.

Description

Technical Field

[0001] This invention relates to the field of battery technology, and in particular to a manufacturing process for a battery cover. Background Technology

[0002] The advent of batteries has provided essential power for our lives, entertainment, and work. With social development and the progress of human civilization, primary batteries, due to their environmental pollution, low capacity, and short lifespan, will gradually be phased out, replaced by secondary batteries with advantages such as no pollution, large capacity, and long lifespan. Among these, lithium batteries, with their unique structure and performance, are widely used in various fields, such as laptops, power banks, and power tools.

[0003] However, the battery cover manufacturing process is quite complex. If the process is substandard and leaks occur during production, air and liquid leaks will occur during the installation of the entire battery. This is especially true for battery covers that are connected using fasteners, which can lead to serious safety issues. Summary of the Invention

[0004] This invention provides a manufacturing process for a battery cover that does not use fasteners for connection, thereby securing all components on the battery cover.

[0005] To solve the above-mentioned technical problems, one technical solution adopted by the present invention is to provide a manufacturing process for a battery cover, comprising the following steps:

[0006] a. The pretreatment of the cover plate and electrode post is as follows:

[0007] Step 1: Immerse the cover plate and electrode in an acid or alkaline solution for degreasing.

[0008] Step 2: Perform nano-processing on the metal surfaces of the degreased cover plate and electrode post to form nano-scale uneven pits on the surface of the cover plate and electrode post.

[0009] Step 3: Place the nano-sized cover plate and electrode into a passivation solution for passivation treatment to form a passivation film on the surface;

[0010] Step 4: The passivation film formed on the surface of the cover plate and the electrode post is sealed with micropores to obtain the finished cover plate and electrode post;

[0011] b. The assembly process for the cover plate and pole is as follows:

[0012] Step 1: Place the pre-treated electrode on the preset fixture and heat the electrode to the first preset temperature;

[0013] Step 2: Dig and cut the resin film to obtain film 1;

[0014] Step 3: Place film 1 on the heated electrode post and position it for proper adhesion;

[0015] Step 4: Continue heating the electrode post. After the film 1 softens, the electrode post will naturally press down, causing the film 1 to wrap around the electrode post, thus obtaining electrode post 1.

[0016] Step 5: Allow the electrode post 1 to cool naturally to the second preset temperature to obtain electrode post coating 1.

[0017] Furthermore, it also includes the following steps:

[0018] Step 6: Press the PPS ring into the electrode post coating 1 under cold loading to obtain electrode post coating 2.

[0019] Furthermore, it also includes the following steps:

[0020] Step 7: Place the cover plate into the reserved work station space for positioning, and use a CCD camera to detect its position;

[0021] Step 8: The electrode post 2 and the positioned cover plate are placed in the third preset temperature station for assembly to obtain the cover plate 2;

[0022] Step 9: Weld the light cover plate 2 to the cover plate to obtain the battery cover plate assembly 1;

[0023] Step 10: Perform secondary welding on battery cover assembly 1 to obtain battery cover assembly 2;

[0024] Step 11: Cool the battery assembly 2. After cooling, unloading is completed.

[0025] Furthermore, the step of immersing the cover plate and electrode in an acid or alkaline solution for degreasing includes:

[0026] The cover plate and electrode post are soaked in an alkaline solution for 3-5 minutes to degrease, and then soaked in an acidic solution for 1-3 minutes to neutralize.

[0027] Furthermore, the passivation film formed after the passivation treatment coats the surface of the nano-sized cover plate and the electrode post.

[0028] Furthermore, in step one of the assembly process, the first preset temperature for heating the pole is 100–300°C.

[0029] Furthermore, in step five of the assembly process, the material is naturally cooled to below the second preset temperature of 100°C.

[0030] Furthermore, in step eight of the assembly process, the third preset temperature is 80–100°C.

[0031] Furthermore, the welding method in step nine is pressure welding, with a working temperature of 100–300°C.

[0032] Furthermore, in step ten, the cooled battery cover assembly 2 is pressure welded again at a working temperature of 100–300°C.

[0033] The beneficial effects of this invention are as follows: The present invention relates to a battery cover plate manufacturing process, comprising the following steps: Step 1: placing the terminal post on a preset fixture and heating the terminal post to a first preset temperature; Step 2: punching the resin film to obtain film 1; Step 3: placing film 1 on the heated terminal post and positioning and bonding it; Step 4: continuously heating the terminal post until film 1 softens, and the terminal post naturally presses down, causing film 1 to wrap the terminal post, thus obtaining terminal post 1; Step 5: naturally cooling the terminal post 1 to a second preset temperature to obtain terminal post coating 1, fixing terminal post coating 1 to a smooth cover plate, and then fixing it to the cover plate to obtain the battery cover plate. This process is simple, significantly improves the yield of finished products, and is very safe. Attached Figure Description

[0034] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, wherein:

[0035] Figure 1 This is a schematic diagram of the manufacturing process of a battery cover provided by the present invention;

[0036] Figure 2 This is a schematic diagram of the pretreatment process for the production of a battery cover provided by the present invention;

[0037] Figure 3 This is a schematic diagram of the production and assembly process of a battery cover provided by the present invention. Detailed Implementation

[0038] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0039] A manufacturing process for a battery cover includes the following steps:

[0040] a. The pretreatment of the cover plate and electrode post is as follows:

[0041] Step 1: Immerse the cover plate and electrode in an acid or alkaline solution for degreasing. Rinse with pure water after degreasing.

[0042] Step 2: Nano-processing of the metal surfaces of the cover plate and electrode. The cover plate and electrode are immersed in a nano-processing solution at room temperature to 60℃ to roughen them, forming nanoscale uneven pits on their surfaces. This increases the bonding area of ​​the metal surface, resulting in stronger and more stable adhesion during subsequent connection processes. The nano-processing solution can be a mixture of various acids with a pH value less than 7 and metal salt solutions.

[0043] Step 3: Immerse the nano-sized cover plate and electrode in a passivation solution to form a passivation film on the surface. The temperature of the passivation solution can be room temperature to 60℃. Passivation treatment forms insoluble basic metal salts and their hydrates, which are deposited on the metal surface to form a passivation film. The passivation solution can be one or more mixtures of ferrous salts, chromates, etc. The passivation film can cover the uneven pits on the surface. After nano-sized treatment, the cover plate and electrode are rinsed with pure water and then dried. Pure water rinsing is used to prevent secondary reactions of residual substances from the nano-sized treatment, which could corrode the surface of the cover plate and electrode, causing damage. Drying only requires hot air blowing of the cover plate and electrode at 50–120℃ for 2–120 minutes.

[0044] Step 4: The passivation film formed on the surface of the cover plate and electrode post is subjected to micropore sealing treatment to obtain the finished cover plate and electrode post. The micropore treatment involves immersing the passivated cover plate and electrode post in a sealing solution at room temperature to 60°C to allow a chemical reaction, followed by rinsing with pure water and then baking at a high temperature of 50°C to 250°C to protect the original passivation film, thereby achieving the sealing purpose. The sealing solution can be a mixed solution containing one or more rare earth elements, molybdates, etc.

[0045] b. The assembly process for the cover plate and pole is as follows:

[0046] Step 1: Place the pre-treated electrode on the preset fixture and heat the electrode to the first preset temperature.

[0047] It should be noted that the fixture has a built-in heating device that transfers heat to the electrode post through contact heat transfer, without using an open flame to heat the electrode post. The fixture is also equipped with a temperature sensor. Once the preset temperature is reached, heating will stop and the temperature needs to be maintained. The first preset temperature for heating the electrode post is 100-300℃.

[0048] Step 2: Dig and cut the resin film to obtain film 1.

[0049] It should be noted that the resin film can be made of PP, PE, polyimide, epoxy resin, etc., but the resin film cannot contain conductive substances and must be an insulating material. Different materials correspond to different melting points, so different temperatures need to be set for the electrode post during the welding process.

[0050] Step 3: Place film 1 on the heated electrode post and position it for bonding.

[0051] It should be noted that film 1 is slightly larger than the electrode post to prepare for subsequent processes.

[0052] Step 4: Continue heating the electrode post until the film 1 softens. Then, the electrode post naturally presses down, allowing the film 1 to wrap around it, thus obtaining electrode post 1. After the film 1 softens, the electrode post is naturally pressed down. The fixture has mounting holes, so under the action of gravity, the softened film 1 is pressed inward without breaking, forming a cavity. The electrode post can then be embedded in this cavity. The film 1's surface area is slightly larger than the electrode post's surface area, preventing it from completely wrapping around it, thus achieving the desired effect. Allow it to cool naturally to the preset temperature of 23–50°C.

[0053] Step 5: Allow the electrode post 1 to cool naturally to the second preset temperature to obtain the electrode post coating 1. It should be noted that after the softened coating 1 is cooled and shaped, it forms a protective sleeve. The cover plate is then heated to a preset temperature of 100-300℃.

[0054] Step Six: Cold press the PPS ring into the electrode post coating 1 to obtain electrode post coating 2. Electrode holes are located at the non-adhesive film 1 position on the upper end of the electrode post. The PPS ring needs to be cold pressed in. Using a cold pressing process can save time and cost, especially when producing several identical cavities. Since the battery has positive and negative electrodes, there are at least two cavities, making the cold pressing process very suitable.

[0055] Step 7: Position the cover plate in the reserved workstation space and perform position detection using a CCD camera. In the above process, after the terminal post is manufactured, the other component of the battery cover, the cover plate, is placed in the reserved workstation space for positioning and position detection. High-precision position detection is required to ensure that there will be no leakage of liquid or gas during subsequent assembly.

[0056] Step 8: The electrode post coating 1 and the positioned cover plate are placed in a station at the third preset temperature for assembly to obtain the cover plate 2. In the battery cover plate manufacturing process, the third preset temperature is 80-100℃. During the assembly of the electrode post coating 1 and the cover plate, to ensure stable assembly of each component, it needs to be carried out in a constant temperature environment, preferably room temperature to 50℃. If the temperature is too high, the coating 1 will easily soften; if the temperature is too low, the components will begin to shrink due to the characteristics of metal, resulting in dimensional misalignment. Therefore, a constant temperature environment is required.

[0057] The battery cover assembly also includes a PP spacer. The cover plate 2 and the PP spacer are cold-fitted. It should be noted that there are 4 protruding metal pillars on the back of the cover plate 2, which are riveted to the PP spacer through the four corresponding riveting holes.

[0058] Step 9: Weld the light cover plate 2 to the cover plate to obtain the battery cover plate assembly 1. The welding method is pressure welding, and the working temperature is 100-300℃.

[0059] Step 10: Perform secondary welding on battery cover assembly 1 to obtain battery cover assembly 2. Then, perform pressure welding on the cooled battery cover assembly 2 at a working temperature of 100-300℃.

[0060] Step 11: Cool the battery assembly 2. After cooling, unloading is completed.

[0061] It should be noted that when assembling the other component of the battery cover assembly, the cover plate, which is already assembled with the above-mentioned process, requires high-precision fitting. Air and dust in the air can cause errors during assembly. Therefore, vacuuming is required to remove air bubbles. This prevents errors when welding the cover plate 2 to the cover plate. The welding method between the cover plate 2 and the cover plate is pressure welding, and the welding temperature is controlled between 100 and 300°C.

[0062] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A manufacturing process for a battery cover, characterized in that, Includes the following steps: a. The pretreatment of the cover plate and electrode post is as follows: Step 1: Immerse the cover plate and electrode in an acid or alkaline solution for degreasing. Step 2: Perform nano-processing on the metal surfaces of the degreased cover plate and electrode post to form nano-scale uneven pits on the surface of the cover plate and electrode post. Step 3: Place the nano-sized cover plate and electrode into a passivation solution for passivation treatment to form a passivation film on the surface; Step 4: The passivation film formed on the surface of the cover plate and the electrode post is sealed with micropores to obtain the finished cover plate and electrode post; b. The assembly process for the cover plate and pole is as follows: Step 1: Place the pre-treated electrode on the preset fixture and heat the electrode to the first preset temperature; Step 2: Dig and cut the resin film to obtain a film sheet; Step 3: Place the film onto the heated electrode post and position it for proper bonding; Step 4: Continue heating the electrode post until the film softens. The electrode post will then naturally press down, causing the film to wrap around the electrode post, resulting in a wrapped electrode post. Step 5: Allow the wrapped electrode to cool naturally to the second preset temperature to obtain the electrode coating.

2. The manufacturing process of the battery cover according to claim 1, characterized in that, It also includes the following steps: Step 6: Press the PPS ring into the electrode post with cold fitting to obtain an electrode post with PPS ring.

3. The manufacturing process of the battery cover according to claim 2, characterized in that, It also includes the following steps: Step 7: Place the cover plate into the reserved work station space for positioning, and use a CCD camera to detect its position; Step 8: The electrode post with PPS ring is coated with glue and the positioned cover plate is placed in the third preset temperature station for assembly to obtain the cover plate. Step 9: Weld the light cover plate to the cover plate to obtain the battery cover plate assembly; Step 10: Perform secondary welding on the above battery cover assembly to obtain the battery cover assembly after secondary welding; Step 11: Cool the battery cover assembly after secondary welding, and then unload it after cooling.

4. The manufacturing process of the battery cover according to claim 1, characterized in that, The step of immersing the cover plate and electrode in an acid or alkaline solution for degreasing includes: The cover plate and electrode post are soaked in an alkaline solution for 3-5 minutes to degrease, and then soaked in an acidic solution for 1-3 minutes to neutralize.

5. The manufacturing process of the battery cover according to claim 1, characterized in that, The passivation film formed after the passivation treatment wraps the surface of the nano-sized cover plate and the electrode.

6. The manufacturing process of the battery cover according to claim 1, characterized in that, In step one of the assembly process, the first preset temperature for heating the pole is 100~300℃.

7. The manufacturing process of the battery cover according to claim 1, characterized in that, In step five of the assembly process, the temperature is naturally cooled to below the second preset temperature of 100°C.

8. The manufacturing process of the battery cover according to claim 3, characterized in that, In step eight of the assembly process, the third preset temperature is 80~100℃.

9. The manufacturing process of the battery cover according to claim 3, characterized in that, The welding method in step nine is pressure welding, and the working temperature is 100~300℃.

10. The manufacturing process of the battery cover according to claim 3, characterized in that, In step ten, the cooled battery cover assembly is pressure welded again at a working temperature of 100~300℃.

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