Connecting structure of 1.5 V constant-voltage lithium battery

Abstract

The utility model discloses a connection structure of a 1.5 V constant voltage lithium battery, which comprises a battery cap, a battery case, a roll core and a positive pole composite tab, the positive pole composite tab is assembled on a positive pole piece of the roll core, the roll core and the positive pole composite tab are arranged in an inner cavity of the circular battery case, the battery cap is assembled at a positive pole end of the battery case for covering, and the positive pole composite tab is assembled at a negative pole end of the battery case. And the positive electrode composite tab is also connected with a battery cap. According to the invention, the structure is simple, new processing equipment is not introduced, the processing flow and the processing technology of the 3.7 V cylindrical lithium ion battery cell are not changed, the positive electrode composite tab is integrated on the original material positive electrode tab of the battery cell on the basis of the original 3.7 V battery cell processing, the manufacturing of the 1.5 V battery is completed, the combination mode is simple, the automatic production is easier to realize, and the production efficiency is improved. The assembling mode is further simplified, the assembling efficiency is improved, and the manufacturing cost is reduced.

Description

Technical Field

[0001] This utility model relates to the field of lithium battery technology, and in particular to a connection structure for a 1.5V constant voltage lithium battery. Background Technology

[0002] Currently, the 1.5V nominal voltage AA / AAA disposable alkaline batteries widely sold in the market are non-rechargeable and relatively environmentally unfriendly. Furthermore, their lifespan is short, and their voltage decreases over time, causing instability. This has made lithium-ion batteries a trend to replace disposable AA / AAA alkaline batteries. However, since cylindrical lithium-ion cells have a nominal voltage of 3.7V, they cannot be directly used in the 1.5V AA / AAA primary alkaline battery field. Therefore, a voltage reduction process is needed for cylindrical lithium-ion cells. The current 1.5V AA / AAA structure mainly involves adding a voltage reduction protection circuit to the head of existing lithium-ion batteries (such as 14430 steel-cased cylindrical lithium-ion batteries or 13450 polymer cylindrical lithium-ion batteries) to obtain a 1.5V AA / AAA battery. However, this structure requires separate head caps, steel casings, brackets, and hardware materials, and also introduces new manufacturing equipment, making the manufacturing process complex and resulting in high battery costs. Utility Model Content

[0003] In order to overcome the above-mentioned shortcomings of the prior art, the purpose of this utility model is to provide a 1.5V lithium battery structure that can replace AA / AAA primary alkaline batteries. It does not require the introduction of new manufacturing equipment, and the manufacturing process is more streamlined. Under the premise of ensuring battery performance, the manufacturing cost is lower.

[0004] The technical solution adopted by this utility model to solve its technical problem is: a connection structure for a 1.5V constant voltage lithium battery, including a battery cap, a battery casing, a core, and a positive electrode composite tab. The positive electrode composite tab is welded to the positive electrode sheet of the core. The core and the positive electrode composite tab are installed in the internal cavity of the circular battery casing. The battery cap is assembled on the positive end of the battery casing and closed. The positive electrode composite tab is also connected to the battery cap.

[0005] As a further improvement of this utility model: the battery cap includes a face pad, a pointed cap, a cap sealing ring, and a battery cap explosion-proof aluminum sheet, which are assembled and sealed in sequence.

[0006] As a further improvement of this utility model: the battery cap further includes a first insulating pad, which is assembled on the top of the winding core, and the battery cap is assembled at the opening at the positive end of the battery casing for a sealed connection.

[0007] As a further improvement of this utility model: a second insulating pad is provided at the bottom of the winding core, and the second insulating pad is also assembled at the bottom of the battery casing cavity.

[0008] As a further improvement of this utility model: the positive electrode composite tab includes an aluminum strip and an FPC voltage drop plate. The FPC voltage drop plate is assembled at one end of the aluminum strip. One end of the aluminum strip is welded to the positive electrode sheet of the core. The other end of the aluminum strip passes through the first insulating pad and connects to the explosion-proof aluminum sheet of the battery cap. The outer periphery of the FPC voltage drop plate is covered with a PET anti-corrosion protective layer.

[0009] As a further improvement of this utility model: the FPC voltage drop board is a 3.7V to 1.5V step-down circuit board.

[0010] Compared with the prior art, the beneficial effects of this utility model are:

[0011] This invention has a simple structure, does not introduce new manufacturing equipment, and does not change the manufacturing process and technology of 3.7V cylindrical lithium-ion cells. Based on the original 3.7V cell manufacturing process, the positive electrode composite tab is integrated into the original positive electrode tab of the cell material to complete the production of 1.5V batteries. The combination method is simple, making it easier to achieve automated production, further simplifying the assembly method, improving assembly efficiency, and reducing manufacturing costs. Attached Figure Description

[0012] Figure 1 Schematic diagram of an explosion of a 1.5V lithium battery assembly structure. Figure 1 ;

[0013] Figure 2 Schematic diagram of an explosion of a 1.5V lithium battery assembly structure. Figure 2 ;

[0014] Figure 3 This is a schematic diagram of the composite tab structure of the positive electrode of a 1.5V lithium battery.

[0015] Reference numerals: 1. Battery casing; 2. Battery cap; 21. Face pad; 22. Pointed cap; 23. Cap sealing ring; 24. Battery cap explosion-proof aluminum sheet; 3. Core; 31. First insulating pad; 32. Second insulating pad; 4. Positive electrode composite tab; 41. Aluminum strip; 42. FPC voltage drop plate. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0017] In order to solve the technical problems in the prior art, the present invention will be further described in conjunction with the accompanying drawings and embodiments:

[0018] like Figures 1 to 3 As shown in the figure, this utility model embodiment discloses a connection structure for a 1.5V constant voltage lithium battery, including a battery cap 2, a battery casing 1, a core 3, and a positive electrode composite tab 4. The positive electrode composite tab 4 is assembled on the positive electrode sheet of the core 3. The core 3 and the positive electrode composite tab 4 are inserted into the internal cavity of the circular battery casing 1. The battery cap 2 is assembled on the positive end of the battery casing 1 to cover it. The positive electrode composite tab 4 is also connected to the battery cap 2.

[0019] According to the connection structure of the 1.5V constant voltage lithium battery of this application, the main components are a battery cap 2, a battery casing 1, a core 3, and a positive electrode composite tab 4. The combination of the core 3 and the positive electrode composite tab 4 is assembled into the battery casing 1, and then the battery cap 2 is used to close it, completing the assembly. The present invention has a simple structure, does not introduce new manufacturing equipment, and does not change the manufacturing process and technology of the 3.7V cylindrical lithium-ion cell. Based on the original 3.7V cell manufacturing process, the positive electrode composite tab 4 is integrated on the original positive electrode tab of the cell material to complete the production of the 1.5V battery. The combination method is simple, easier to automate production, further simplifies the assembly method, improves assembly efficiency, and reduces manufacturing costs.

[0020] In one embodiment of the present invention, the battery cap 2 includes a face pad 21, a pointed cap 22, a cap sealing ring 23, and a battery cap explosion-proof aluminum sheet 24, which are sequentially assembled and sealed together.

[0021] In one embodiment of the present invention, the battery cap 2 further includes a first insulating pad 31, which is mounted on the top of the core 3, and the battery cap 2 is mounted and sealed at the opening at the positive end of the battery casing 1.

[0022] In one embodiment of the present invention, a second insulating pad 34 is provided at the bottom of the core 3, and the second insulating pad 34 is also assembled at the bottom of the cavity of the battery casing 1.

[0023] In one embodiment of this utility model, the positive electrode composite tab 4 includes an aluminum strip 41 and an FPC voltage drop plate 42. The FPC voltage drop plate 42 is assembled at one end of the aluminum strip 41, and the other end of the aluminum strip 41 is welded to the positive electrode sheet of the core 3. The other end of the aluminum strip 41 passes through the first insulating pad 31 and is welded to the explosion-proof aluminum sheet 24 of the battery cap. The outer periphery of the FPC voltage drop plate 42 is covered with a PET anti-corrosion protective layer.

[0024] In one embodiment of this utility model, the FPC voltage drop board 42 is a 3.7V to 1.5V step-down circuit board.

[0025] In this application, the standard AA model 14500 cylindrical lithium battery is selected, and the head pad 21, positive electrode pointed cap 22, battery cap sealing ring 23, battery cap explosion-proof aluminum sheet, cell positive electrode first insulating pad 31, core 3, cell negative electrode second insulating pad 32 and battery casing 1 of the 3.7V 14500 battery are used to complete the manufacturing of the cell positive and negative electrode plates and the assembly of the cap according to the normal manufacturing process of 3.7V cylindrical lithium-ion batteries.

[0026] After the positive and negative electrode sheets of the battery cell are manufactured, the conventional positive pure aluminum strip 41 tab is replaced with a positive composite tab 4 containing an integrated circuit that steps down the voltage from 3.7V to 1.5V. Then, the positive composite tab 4 is welded. The manufactured positive / negative electrode sheets and separator are then used to manufacture the core 3 according to the manufacturing process of the 3.7V battery cell.

[0027] The positive composite tab 4 is composed of an FPC voltage drop plate 42 containing a 3.7V to 1.5V voltage drop integrated circuit, which is laser welded to the positive pure aluminum strip 41 at both ends. The FPC voltage drop plate 42 and the laser welding points of the FPC voltage drop plate 42 and the positive pure aluminum strip 41 are completely covered by a PET anti-electrolyte corrosion protective layer.

[0028] A 3.7V to 1.5V step-down circuit was introduced in the middle of the original pure nickel strip. The various components of the step-down circuit (such as ICs, MOS, capacitors, resistors, inductors, etc.) were surface-mounted on the copper base plate of the FPC step-down board 42 via SMT. Then, the two ends of the copper base plate of the FPC step-down board 42 were laser-welded to two aluminum strips 41 respectively. The aluminum strips 41 were welded to both ends of the FPC step-down board 42, so that the FPC step-down board 42 and the two aluminum strips 41 were combined to form a positive electrode tab. One end of the composite positive electrode tab, aluminum strip 41, was ultrasonically welded to the positive electrode sheet of the battery, and the other end of the composite positive electrode tab, aluminum strip 41, was laser-welded to the battery cap 2. Since the electrolyte inside the battery cell can corrode the electronic circuit, a layer of electrolyte-resistant PET layer was completely coated and wrapped around the entire step-down electronic circuit and the welding points to ensure that the step-down electronic circuit is not damaged by electrolyte corrosion inside the battery cell. Finally, a positive composite electrode tab that can be used for 1.5V was completed.

[0029] Following the normal battery cell manufacturing process, the completed core 3 is placed on the bottom of the battery casing 1 with a negative electrode insulating pad, and then the core 3 is inserted to make the negative electrode bottom. Then, the positive electrode tab aluminum strip 41 is laser welded to the assembled battery cap explosion-proof aluminum sheet. After that, the core 3 is baked, injected with liquid, sealed, aged and capacity-tested, etc., and finally the battery is manufactured, producing a stable and reliable 1.5V lithium battery.

[0030] In summary, any other corresponding modifications made by those skilled in the art after reading this utility model document, based on the technical solution and concept of this utility model without creative mental effort, shall all fall within the scope of protection of this utility model.

Claims

1. A connection structure for a 1.5V constant voltage lithium battery, characterized in that, The battery includes a battery cap, a battery casing, a core, and a positive electrode composite tab. The positive electrode composite tab is assembled on the positive electrode sheet of the core. The core and the positive electrode composite tab are inserted into the internal cavity of the circular battery casing. The battery cap is assembled on the positive end of the battery casing and covers it. The positive electrode composite tab is also connected to the battery cap.

2. The connecting structure of a 1.5V constant voltage lithium battery according to claim 1, wherein The battery cap includes a face pad, a pointed cap, a cap sealing ring, and a battery cap explosion-proof aluminum sheet, which are assembled and sealed together in sequence.

3. The connecting structure of a 1.5V constant voltage lithium battery according to claim 2, wherein The battery cap also includes a first insulating pad, which is fitted onto the top of the winding core, and the battery cap is fitted onto the opening at the positive end of the battery casing for a sealing connection.

4. The connecting structure of a 1.5V constant voltage lithium battery according to claim 3, wherein A second insulating pad is provided at the bottom of the winding core, and the second insulating pad is also assembled at the bottom of the battery casing cavity.

5. The connection structure of a 1.5V constant voltage lithium battery according to claim 4, characterized in that, The positive electrode composite tab includes an aluminum strip and an FPC voltage drop plate. The FPC voltage drop plate is assembled at one end of the aluminum strip. One end of the aluminum strip is welded to the positive electrode sheet of the core. The other end of the aluminum strip passes through the first insulating pad and connects to the explosion-proof aluminum sheet of the battery cap. The outer periphery of the FPC voltage drop plate is covered with a PET anti-corrosion protective layer.

6. The connecting structure of a 1.5V constant voltage lithium battery according to claim 5, wherein The FPC step-down circuit board is a 3.7V to 1.5V step-down circuit board.

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