Secondary battery and its manufacturing method

Abstract

To provide a secondary battery having a simple structure, being easy to assemble, and having a high assembly effect, and a method for manufacturing the same. [Solution] A method for manufacturing a secondary battery includes the steps of: placing a PCBA substrate at an end of a battery body, contacting the positive electrode contact piece with the positive electrode can, bringing the negative electrode contact piece close to or in contact with the negative electrode can, and connecting the negative electrode contact piece and the negative electrode can by welding to position the PCBA substrate at the end of the battery body to obtain a semi-finished product; and transferring the semi-finished product to a mold, which is provided with a positioning cavity and a molding cavity, the battery body is positioned in the positioning cavity, parts at the end of the battery body are positioned in the molding cavity, and injection molding or resin injection is performed into the molding cavity, and after hardening, an end cover sheet capable of covering all parts at the end of the battery body is formed, whereby a positive electrode cap is exposed on the top surface of the end cover sheet, thereby obtaining a secondary battery.

Description

[Technical field]

[0001] The present invention relates to the technical field of batteries, and more particularly to a secondary battery and a method for manufacturing the same. [Background technology]

[0002] In daily life, cylindrical batteries include AA batteries (No. 5 batteries), AAA batteries (No. 7 batteries), and D batteries (No. 1 batteries), and are widely used in toys, small home appliances, digital products, etc. Cylindrical batteries are mainly divided into two types: dry batteries and rechargeable batteries. Dry batteries are disposable batteries that cannot be recharged, and alkaline dry batteries and carbon dry batteries are common, while rechargeable batteries, such as nickel-metal hydride batteries and lithium-ion batteries, can be charged and used repeatedly when used with a charger.

[0003] In order to improve the charging and discharging performance of cylindrical batteries, the utility model with publication number "CN214797515U" and title "Cylindrical Battery with Built-in Charge and Discharge Protection Circuit" discloses a cylindrical battery with built-in charge and discharge protection circuit, which includes a metal case, a cellulose core, a rubber plug holder, and a protection circuit board, the protection circuit board being provided on the outer surface of the rubber plug holder and located within the open end of the metal case, two cell poles provided on the positive end of the cellulose core penetrate the rubber plug holder and are electrically connected to the protection circuit board, and the positive cap is provided on the outer surface of the protection circuit board. Two metal clips are provided on the inner surface of the protection circuit board, and the two cell poles respectively penetrate along the longitudinal direction of the rubber plug holder and are inserted into the two metal clips and contact the metal clips respectively. By adding a protection circuit board to the cylindrical battery, the patent provides accurate charge and discharge control of the battery, avoiding overcharging or overdischarging, and extending the service life of the battery. However, the two positive and negative cell poles are both located at the positive end of the cylindrical battery and contact each other via a metal clip, making the structure relatively complicated. In addition, the cell poles and the metal clips must be accurately aligned during assembly, which places high demands on assembly precision, affecting production efficiency and making it prone to problems such as poor contact and loose contact. Summary of the Invention

[0004] In view of the above-mentioned drawbacks, the present invention aims to provide a secondary battery having a simple structure, being easy to assemble, and having a high assembly efficiency, and a method for manufacturing the same. [Means for solving the problem]

[0005] In order to achieve the above object, the present invention provides the following technical solutions: The method for producing a secondary battery includes the steps of: (1) preparing a battery body having a positive electrode can and a negative electrode can, a PCBA substrate, a positive electrode cap, a positive electrode contact piece located at the center of the bottom surface of the PCBA substrate, a negative electrode contact piece located at the edge of the PCBA substrate, and a metal pin; (2) connecting an upper end of the metal pin to the positive electrode cap and welding and fixing a lower end of the metal pin to the PCBA substrate, thereby positioning the positive electrode cap directly above the PCBA substrate; (3) placing the PCBA substrate at an end of the battery body, bringing the positive electrode contact piece into contact with the positive electrode can, bringing the negative electrode contact piece into close proximity with or into contact with the negative electrode can, and connecting the negative electrode contact piece and the negative electrode can by welding to position the PCBA substrate at the end of the battery body and obtain a semi-finished product; and (4) transferring the semi-finished product into a mold, the mold being provided with a positioning cavity and a molding cavity, the battery body being positioned in the positioning cavity, the parts at the end of the battery body being positioned in the molding cavity, and injection molding or resin injection being carried out into the molding cavity, and after hardening, an end cover sheet capable of covering all the parts at the end of the battery body is formed, where the positive electrode cap is exposed on the top surface of the end cover sheet, thereby obtaining a secondary battery.

[0006] A preferred solution of the present invention further includes the step (5) of packaging the secondary battery to form an adhesive film layer, which has a beautiful appearance and can better protect the battery, and can also print parameter specifications.

[0007] In a preferred solution of the present invention, the end cover sheets are generally cylindrical, with an outer diameter that matches the outer diameter of the battery body, for good overall harmony.

[0008] A preferred solution of the present invention further includes a Type-C interface, the Type-C interface is welded to the PCBA board, and an opening corresponding to the Type-C interface is reserved in the end cover sheet.

[0009] As a preferred solution of the present invention, the longitudinal direction of the Type-C interface is aligned with the radial direction of the battery body, which effectively saves the length and space occupied by the battery body and improves the battery capacity.

[0010] In a preferred embodiment of the present invention, the longitudinal direction of the Type-C interface coincides with the axial direction of the battery body, and it only occupies the length of the battery, is not limited by the diameter of the battery, and can be applied to smaller batteries.

[0011] In a preferred embodiment of the present invention, the Type-C interface is located between the positive cap and the PCBA board, and an insulating pad is provided between the Type-C interface and the positive cap, which prevents the positive cap from contacting the metal can of the Type-C interface by the insulating pad, thereby providing a good insulating effect.

[0012] As a preferred solution of the present invention, the edge of the PCBA substrate is provided with a plurality of arc-shaped recesses arranged in a circular symmetrical manner, and the negative electrode contact piece is located on the inner wall of the arc-shaped recesses, and the provision of the arc-shaped recesses facilitates the welding operation.

[0013] As a preferred solution of the present invention, a support pillar for supporting the positive electrode cap is provided at the center of the top surface of the PCBA substrate, and the positive electrode cap is fitted to the end of the support pillar, thereby preventing the positive electrode cap from sinking under force.

[0014] The secondary battery is manufactured by the method for manufacturing a secondary battery.

[0015] The beneficial effects of the present invention are as follows: The manufacturing method of the secondary battery of the present invention is simple and easy to realize, during manufacturing, the PCBA board directly contacts the positive electrode can of the battery body through the positive electrode contact piece, and the negative electrode contact piece at the edge of the PCBA board is also close to or in contact with the negative electrode can of the battery body, and then welding and positioning are performed, the connection is firm, and the effect of electrical contact is good, and then all the parts at the end of the battery body are covered and cured by mold injection molding or resin injection to form an integrated structure, which has good protection effect and good waterproof effect, and the overall structure is simple and occupies a small space, which can save more internal space for the battery body, and thus can increase the size and capacity of the battery body, extend the duration of the battery, and improve the overall competitiveness of the product. In addition, the battery of the present invention has the same overall appearance as the conventional battery, the same usage method as the conventional battery, and can be adapted to the conventional charging box and Type-C charging, so that it is easy to use.

[0016] The invention will now be further described with reference to the following figures and examples. [Brief description of the drawings]

[0017] [Figure 1] FIG. 2 is a schematic diagram of the three-dimensional structure of the secondary battery in Example 1. [Diagram 2] 1 is an exploded structural schematic diagram of a secondary battery in Example 1. FIG. [Diagram 3] 1 is a schematic diagram 1 showing the structure of a PCBA substrate and a positive electrode cap of a secondary battery in Example 1. FIG. [Figure 4]2 is a structural schematic diagram 2 of the PCBA substrate and the positive electrode cap of the secondary battery in Example 1. FIG. [Diagram 5] FIG. 13 is a schematic diagram of the three-dimensional structure of a secondary battery in Example 2. [Figure 6] FIG. 11 is an exploded structural schematic diagram of a secondary battery in Example 2. [Figure 7] FIG. 11 is a structural schematic diagram of a PCBA substrate of a secondary battery in Example 2. [Figure 8] FIG. 11 is a schematic front view of a secondary battery according to a third embodiment. [Figure 9] 1 is a schematic exploded structural view 1 of a secondary battery in Example 3. FIG. [Figure 10] 2 is an exploded structural schematic diagram 2 of the secondary battery in Example 3. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] Example 1: Please refer to FIG. 1 to FIG. 4, the secondary battery and the manufacturing method thereof according to this example include the following steps: Step (1): Prepare a battery body 1 having a positive electrode can 11 and a negative electrode can 12, a PCBA substrate 2, a positive electrode cap 3, a positive electrode contact piece 4 located at the center of the bottom surface of the PCBA substrate 2, a negative electrode contact piece 5 located at the edge of the PCBA substrate 2, and a metal pin 6. Preferably, the edge of the PCBA substrate 2 is provided with a plurality of arc-shaped recesses 21 arranged symmetrically around a circle, and the negative electrode contact piece 5 is located on the inner wall of the arc-shaped recesses 21. By providing the arc-shaped recesses 21, the welding operation is facilitated. Step (2): The upper end of the metal pin 6 is connected to the positive electrode cap 3, and the lower end of the metal pin 6 is welded and fixed to the PCBA substrate 2, thereby positioning the positive electrode cap 3 directly above the PCBA substrate 2. Preferably, a support pillar for supporting the positive electrode cap 3 is provided at the center of the top surface of the PCBA substrate 2, and the positive electrode cap 3 is fitted to the end of the support pillar, thereby preventing the positive electrode cap 3 from sinking due to force. Step (3): The PCBA substrate 2 is placed at the end of the battery body 1, the positive electrode contact piece 4 is brought into contact with the positive electrode can 11, the negative electrode contact piece 5 is brought close to or into contact with the negative electrode can 12, and the negative electrode contact piece 5 and the negative electrode can 12 are connected by welding, thereby positioning the PCBA substrate 2 at the end of the battery body 1 and obtaining a semi-finished product. Step (4): The semi-finished product is transferred to a mold, and a positioning cavity and a molding cavity are provided in the mold, the battery body 1 is positioned in the positioning cavity, the parts at the end of the battery body 1 are positioned in the molding cavity, and injection molding or resin injection is carried out into the molding cavity to form an end cover sheet 7 that can cover all the parts at the end of the battery body 1 after hardening, where the positive electrode cap 3 is exposed on the top surface of the end cover sheet 7, thereby obtaining a secondary battery, and preferably, the end cover sheet 7 is cylindrical as a whole, with an outer diameter that matches the outer diameter of the battery body 1, and has good overall harmony.

[0019] Step (5): The secondary battery is packaged to form an adhesive film layer 8, which has a beautiful appearance and can better protect the battery, and can also print parameter specifications.

[0020] Example 2: Please refer to FIG. 5 to FIG. 7. The secondary battery and the manufacturing method thereof according to this example are basically the same as the method and structure of Example 1, except that it further includes a Type-C interface 9, and the PCBA substrate 2 is not provided with a support pillar 22, but is supported by the Type-C interface 9. Specifically, the Type-C interface 9 is welded to the PCBA substrate 2, and an opening corresponding to the Type-C interface 9 is secured in the end cover sheet 7. The Type-C interface 9 is located between the positive electrode cap 3 and the PCBA substrate 2, and an insulating pad 10 is provided between the Type-C interface 9 and the positive electrode cap 3. The insulating pad 10 prevents the positive electrode cap 3 from contacting the metal can of the Type-C interface 9, and has a good insulating effect. The interface longitudinal direction of the Type-C interface 9 coincides with the radial direction of the battery body 1. The length space occupied by the battery body 1 is effectively saved, and the battery capacity is improved.

[0021] Example 3: Please refer to FIG. 8 to FIG. 10. The secondary battery and the manufacturing method thereof according to this example are basically the same as the method and structure of Example 1, except that it further includes a Type-C interface 9, and the PCBA substrate 2 is not provided with a support pillar 22, but is supported by the Type-C interface 9. The Type-C interface 9 is welded to the PCBA substrate 2, and an opening corresponding to the Type-C interface 9 is secured in the end cover sheet 7. The Type-C interface 9 is located between the positive electrode cap 3 and the PCBA substrate 2, and an insulating pad 10 is provided between the Type-C interface 9 and the positive electrode cap 3. The insulating pad 10 prevents the positive electrode cap 3 from contacting the metal can of the Type-C interface 9, and has a good insulating effect. The interface longitudinal direction of the Type-C interface 9 coincides with the axial direction of the battery body 1. It only occupies the length space of the battery, and is not limited by the diameter of the battery, and can be applied to smaller batteries.

[0022] In short, during the manufacture of the secondary battery of the present invention, the PCBA substrate 2 is in direct contact with the positive electrode can 11 of the battery body 1 through the positive electrode contact piece 4, and the negative electrode contact piece 5 at the edge of the PCBA substrate 2 is also in close proximity to or in contact with the negative electrode can 12 of the battery body 1, and then welding and positioning are performed to ensure a firm connection and good electrical contact effect. Then, all parts at the end of the battery body are covered and cured by mold injection molding or resin injection to form an integrated structure with good protection effect and good waterproof effect. In addition, the overall appearance of the battery of the present invention is consistent with that of conventional batteries, and the usage method is also consistent with that of conventional batteries, and it can be adapted to conventional charging boxes and Type-C charging, so that it is simple and convenient to use.

[0023] Based on the disclosure and teachings of the above specification, those skilled in the art to which the present invention pertains may make changes or modifications to the above embodiments. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and modifications and changes made to the present invention should fall within the scope of the claims of the present invention. In addition, although specific terms are used in this specification, these terms are for the convenience of description and do not limit the present invention in any way, and any battery structure and method that is the same or similar thereto are within the protection scope of the present invention.

Claims

1. Step (1) of preparing a battery body having a positive electrode can and a negative electrode can, a PCBA substrate, a positive electrode cap, a positive electrode contact piece located at the center of the bottom surface of the PCBA substrate, a negative electrode contact piece located at the edge of the PCBA substrate, and a metal pin; (2) positioning the positive electrode cap directly above the PCBA substrate by connecting an upper end of the metal pin to the positive electrode cap and welding and fixing a lower end of the metal pin to the PCBA substrate; Step (3) of placing the PCBA substrate at an end of the battery body, bringing the positive electrode contact piece into contact with the positive electrode can, bringing the negative electrode contact piece into close proximity with or into contact with the negative electrode can, and connecting the negative electrode contact piece and the negative electrode can by welding to position the PCBA substrate at the end of the battery body and obtain a semi-finished product; and (4) transferring the semi-finished product to a mold, the mold being provided with a positioning cavity and a molding cavity, the battery body being positioned in the positioning cavity, a part at an end of the battery body being positioned in the molding cavity, injection molding or resin injection being performed into the molding cavity, and after hardening, an end cover sheet capable of covering all the parts at the end of the battery body is formed, whereby the positive electrode cap is exposed on the top surface of the end cover sheet, thereby obtaining a secondary battery.

2. 2. The method for manufacturing a secondary battery according to claim 1, further comprising the step of: packaging the secondary battery and forming an adhesive film layer (5).

3. 2. The method for producing a secondary battery according to claim 1, wherein the end cover sheet is generally cylindrical and has an outer diameter that coincides with an outer diameter of the battery body.

4. 2. The method of claim 1, further comprising: a Type-C interface, the Type-C interface being welded to the PCBA substrate; and an opening corresponding to the Type-C interface being secured in the end cover sheet.

5. 5. The method for manufacturing a secondary battery according to claim 4, wherein a longitudinal direction of the Type-C interface coincides with a radial direction of the battery body.

6. 5. The method for manufacturing a secondary battery according to claim 4, wherein a longitudinal direction of the Type-C interface coincides with an axial direction of the battery body.

7. 5. The method of claim 4, wherein the Type-C interface is located between the positive electrode cap and the PCBA substrate, and an insulating pad is provided between the Type-C interface and the positive electrode cap.

8. 2. The method for manufacturing a secondary battery according to claim 1, wherein a plurality of arc-shaped recesses are provided in a circular symmetrical manner on the edge of the PCBA substrate, and the negative electrode contact piece is located on the inner wall of the arc-shaped recesses.

9. 2. The method for manufacturing a secondary battery according to claim 1, wherein a support pillar for supporting the positive electrode cap is provided at the center of the top surface of the PCBA substrate.

10. A secondary battery produced by the method for producing a secondary battery according to any one of claims 1 to 9.

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