Secondary battery and manufacturing method for the same

Abstract

To provide a secondary battery in which the structure is simple, the assembly is easy, and the assembling effect is high, and a manufacturing method for the secondary battery.SOLUTION: A manufacturing method for a secondary battery includes the steps of: disposing a PCBA substrate at an end part of a battery main body, bringing a positive electrode contact piece into contact with a positive electrode can, bringing a negative electrode contact piece close to or into contact with a negative electrode can, connecting the negative electrode contact piece and the negative electrode can by welding, and positioning the PCBA substrate to the end part of the battery main body, thereby obtaining a semifinished product; and transferring the semifinished product to a mold, providing a positioning cavity and a molding cavity in the mold, positioning the battery main body in the positioning cavity, positioning a component at the end part of the battery main body inside the molding cavity, performing injection molding or resin injection in the molding cavity and curing, and then forming an end cover sheet that can cover the entire components at the end part of the battery main body, in which a positive electrode cap is exposed at a top surface of the end cover sheet, thereby obtaining a secondary battery.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and more specifically to secondary batteries and their manufacturing methods.

Background Art

[0002] In daily life, cylindrical batteries include AA batteries (size 5 batteries), AAA batteries (size 7 batteries), D batteries (size 1 batteries), etc., and are widely used in toys, small household 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 charged, and alkaline dry batteries and carbon dry batteries are common. Rechargeable batteries, such as nickel-metal hydride batteries and lithium-ion batteries, can be charged by using a charger and reused.

[0003] In order to improve the charge and discharge performance of cylindrical batteries, a utility model with the publication number "CN214797515U" and the name "Cylindrical battery with built-in charge and discharge protection circuit" discloses a cylindrical battery with a built-in charge and discharge protection circuit including a metal case, a cell roll core, a rubber plug holder, and a protection circuit board. The protection circuit board is provided inside the outer surface of the rubber plug holder and is located inside the open end of the metal case. Two cell poles provided at the positive electrode end of the cell roll core penetrate through the rubber plug holder and are electrically connected to the protection circuit board, and the positive electrode 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. The two cell poles respectively penetrate along the longitudinal direction of the rubber plug holder and are inserted into the two metal clips and are in contact with the metal clips respectively. This patent can accurately control the charge and discharge of the battery by additionally providing a protection circuit board inside the cylindrical battery, avoid overcharging or over-discharging, and extend the service life of the battery. However, both of the positive and negative cell pole columns are located at the positive electrode end of the cylindrical battery and are in contact with each other through metal clips. The structure is relatively complex, and it is necessary to accurately align the cell poles and metal clips during assembly. The requirement for assembly accuracy is high, which affects the production efficiency and is also prone to problems such as poor contact and loose contact.

Summary of the Invention

[0004] In view of the above drawbacks, an object of the present invention is to provide a secondary battery with a simple structure, easy to assemble, and high assembly efficiency, and a method for manufacturing the same.

Means for Solving the Problems

[0005] To achieve the above object, the present invention provides the following technical solutions. A method for manufacturing a secondary battery includes: 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; Step (2) of positioning the positive electrode cap directly above the PCBA substrate by connecting the upper end of the metal pin to the positive electrode cap and welding and fixing the lower end of the metal pin to the PCBA substrate; Step (3) of disposing 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 close to 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 to obtain a semi-finished product; Step (4) of transferring the semi-finished product to a mold provided with a positioning cavity and a forming cavity, positioning the battery body in the positioning cavity and the components at the end of the battery body in the forming cavity, performing injection molding or resin injection in the forming cavity, and after curing, forming an end cover sheet capable of covering all the components at the end of the battery body, wherein the positive electrode cap is exposed on the top surface of the end cover sheet, thereby obtaining a secondary battery.

[0006] Preferably, the method further includes Step (5) of packaging the secondary battery to form an adhesive film layer, which can make the appearance beautiful, better protect the battery, and also print parameter specifications.

[0007] As a preferred solution of the present invention, the end cover sheet is cylindrical as a whole, the outer diameter thereof coincides with the outer diameter of the battery body, and the overall harmony is good.

[0008] As a preferred solution of the present invention, it 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 secured on the end cover sheet.

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

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

[0011] As a preferred form of the present invention, the Type-C interface is located between the positive electrode cap and the PCBA board, and an insulating pad is provided between the Type-C interface and the positive electrode cap. The contact between the positive electrode cap and the metal can of the Type-C interface is prevented by the insulating pad, and the insulation effect is good.

[0012] As a preferred solution of the present invention, a plurality of arc-shaped recesses are provided symmetrically in a circular shape on the edge of the PCBA board, and the negative electrode contact piece is located on the inner wall of the arc-shaped recess. By providing the arc-shaped recess, the welding operation is facilitated.

[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, so that it is possible to avoid the positive electrode cap from sinking under force.

[0014] The secondary battery is manufactured by the manufacturing method of the 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 implement. During manufacturing, the PCBA substrate 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 substrate also approaches or contacts the negative electrode can of the battery body. Then, welding and positioning are performed, and the connection is firm, and the effect of electrical contact is good. Then, all the components at the end of the battery body are coated and cured by injection molding or resin injection using a mold to form an integral structure, which has a good protection effect and a good waterproof effect. Also, the overall structure is simple, occupies a small space, can save more internal space for the battery body, and thus can increase the size and capacity of the battery body, extend the battery life, and improve the overall competitiveness of the product. In addition, the battery of the present invention has an overall appearance that is consistent with that of conventional batteries, and the usage method is also consistent with that of conventional batteries, and it can also be adapted to conventional charging boxes and Type-C charging, so it is easy to use.

[0016] Hereinafter, the present invention will be further described with reference to the drawings and examples.

Brief Description of the Drawings

[0017]

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Embodiments for Carrying Out the Invention

[0018] Example 1: Referring to FIGS. 1 to 4, the secondary battery and its manufacturing method 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, a plurality of arc-shaped recesses 21 are provided symmetrically in a circular shape at the edge of the PCBA substrate 2, and the negative electrode contact piece 5 is located on the inner wall of the arc-shaped recess 21. By providing the arc-shaped recess 21, the welding operation can be facilitated. Step (2): Connect the upper end of the metal pin 6 to the positive electrode cap 3, and weld and fix the lower end of the metal pin 6 to the PCBA substrate 2 to position the positive electrode cap 3 directly above the PCBA substrate 2. Preferably, a support column for supporting the positive electrode cap 3 is provided at the center of the top surface of the PCBA substrate 2, and by fitting the positive electrode cap 3 to the end of the support column, it is possible to avoid the positive electrode cap 3 from sinking under force. Step (3): Place the PCBA substrate 2 at the end of the battery body 1, bring the positive electrode contact piece 4 into contact with the positive electrode can 11, bring the negative electrode contact piece 5 close to or into contact with the negative electrode can 12, connect the negative electrode contact piece 5 and the negative electrode can 12 by welding, position the PCBA substrate 2 at the end of the battery body 1, and obtain a semi-finished product. Step (4): Transfer the semi-finished product to a mold, which is provided with a positioning cavity and a forming cavity. The battery body 1 is located in the positioning cavity, and the components at the end of the battery body 1 are located in the forming cavity. Perform injection molding or resin injection in the forming cavity to form an end cover sheet 7 that can cover all the components at the end of the battery body 1 after curing. Here, the positive electrode cap 3 is exposed on the top surface of the end cover sheet 7, thereby obtaining a secondary battery. Preferably, the end cover sheet 7 is generally cylindrical, with an outer diameter that matches the outer diameter of the battery body 1, and has good overall harmony.

[0019] Step (5): Package the secondary battery 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: Refer to FIGS. 5 to 7. The secondary battery and its manufacturing method according to this example are basically the same as the method and structure of Example 1. The difference is that it further includes a Type-C interface 9, and there is no support post 22 provided on the PCBA substrate 2, and it 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 on 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 contact between the positive electrode cap 3 and the metal can of the Type-C interface 9, and the insulation effect is good. The interface longitudinal direction of the Type-C interface 9 coincides with the radial direction of the battery body 1. It effectively saves the length space occupied by the battery body 1 and improves the battery capacity.

[0021] Example 3: Refer to FIGS. 8 to 10. The secondary battery and its manufacturing method according to this example are basically the same as the method and structure of Example 1. The difference is that it further includes a Type-C interface 9, and there is no support post 22 provided on the PCBA substrate 2, and it 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 on 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 contact between the positive electrode cap 3 and the metal can of the Type-C interface 9, and the insulation effect is good. 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 also be applied to smaller batteries.

[0022] In short, when manufacturing the secondary battery of the present invention, the PCBA board 2 directly contacts 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 board 2 also approaches or contacts the negative electrode can 12 of the battery body 1. Then, welding and positioning are performed, and the connection is firm, with good electrical contact effect. After that, all the components at the end of the battery body are coated and cured by injection molding or resin injection using a mold to form an integrated structure, with good protection effect and good waterproof effect. Also, the battery of the present invention has an overall appearance that is consistent with that of conventional batteries, and the usage method is also consistent with that of conventional batteries, and it can also be adapted to conventional charging boxes and Type-C charging, so it can be used simply and conveniently.

[0023] Based on the disclosure and teachings of the above specification, those skilled in the technical field to which the present invention pertains can make changes and modifications to the above embodiments. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and the modifications and changes made to the present invention should also fall within the scope of the claims of the present invention. Also, although specific terms are used in this specification, these terms are for convenience of explanation and do not limit the present invention in any way, and any battery structures and methods that are 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; Step (2) of positioning the positive electrode cap directly above the PCBA substrate by connecting the upper end of the metal pin to the positive electrode cap and welding and fixing the lower end of the metal pin to the PCBA substrate; Step (3) of arranging the PCBA substrate at the end of the battery body, bringing the positive electrode contact piece into contact with the positive electrode can, bringing the negative electrode contact piece close to or into contact with the negative electrode can, connecting the negative electrode contact piece and the negative electrode can by welding, positioning the PCBA substrate at the end of the battery body, and obtaining a semi-finished product; Step (4) of transferring the semi-finished product to a mold, providing a positioning cavity and a forming cavity in the mold, positioning the battery body in the positioning cavity, positioning the components at the end of the battery body in the forming cavity, performing injection molding or resin injection in the forming cavity, and forming an end cover sheet that can cover all the components at the end of the battery body after curing. Here, the positive electrode cap is exposed on the top surface of the end cover sheet, thereby obtaining a secondary battery. The manufacturing method of the secondary battery is characterized by including the above steps.

2. The manufacturing method of the secondary battery according to Claim 1, further including Step (5) of packaging the secondary battery to form an adhesive film layer.

3. The manufacturing method of the secondary battery according to Claim 1, wherein the end cover sheet is cylindrical as a whole and the outer diameter thereof coincides with the outer diameter of the battery body.

4. The manufacturing method of the secondary battery according to Claim 1, further including a Type-C interface, wherein the Type-C interface is welded to the PCBA substrate, and an opening corresponding to the Type-C interface is provided in the end cover sheet.

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

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

7. 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. The method for manufacturing a secondary battery according to claim 4, wherein the method is characterized by this.

8. A plurality of arc-shaped recesses are provided symmetrically in a circular shape on the edge of the PCBA substrate, and the negative electrode contact piece is located on the inner wall of the arc-shaped recess. The method for manufacturing a secondary battery according to claim 1, wherein the method is characterized by this.

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

10. A secondary battery manufactured by the method for manufacturing a secondary battery according to any one of claims 1 to 9, wherein the secondary battery is characterized by this.

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