Step-down circuit assembly of lithium battery and 1.5 V lithium battery

Abstract

The utility model relates to a step-down circuit assembly of a lithium battery and a 1.5 V. The step-down circuit assembly comprises a PCB, an outer conductive cap and an inner conductive cap, a positive copper ring and a negative copper ring are arranged on the front face of the PCB, the positive copper ring is electrically connected with the outer conductive cap, the outer conductive cap serves as a low-voltage output positive electrode, the negative copper ring serves as a common negative electrode, and the inner conductive cap is electrically connected with the positive copper ring. A high-voltage input copper ring is arranged on the back face of the PCB and electrically connected with the inner conductive cap, and the inner conductive cap serves as a high-voltage input positive electrode. According to the PCB, the functions of high-voltage input and low-voltage output are realized through the three copper rings; the high-voltage input copper ring serves as a high-voltage input positive electrode, the positive electrode copper ring serves as an output positive electrode of the lithium battery, the negative electrode copper ring serves as an output negative electrode of the lithium battery, the same-port charging and discharging function is achieved, no conductive cable needs to be arranged, the stability of electrical performance is higher, the internal connection structure of the lithium battery is simplified, and the lithium battery is safer.

Description

Technical Field

[0001] The present application relates to the technical field of lithium batteries, and in particular to a lithium battery step-down circuit assembly and a 1.5V lithium battery. Background Art

[0002] No. 5 and No. 7 batteries are very common batteries, widely used in remote controls, electric toys, electric toothbrushes, shavers, wireless microphones, doorbells and other devices. They are generally disposable dry batteries, but there are also rechargeable nickel-metal hydride batteries. Nickel-metal hydride batteries have memory effects, a small number of rechargeable times, and a short lifespan, so their practical applications are relatively limited.

[0003] Lithium batteries have the advantages of no memory effect, high energy density and long service life, but the voltage of lithium battery cells is generally 3.0-4.2V. Even if they are made into the size of No. 5 and No. 7 batteries, they cannot be directly applied to various existing devices. For this reason, someone has designed a lithium battery that can step down the voltage, reducing the output voltage to 1.5V, improving the battery's versatility, and can replace existing disposable batteries and nickel-hydrogen batteries, with broad application prospects.

[0004] For example, the Chinese patent application with publication number CN203787480U and title “A cylindrical battery device with variable voltage” discloses a low-voltage lithium battery, which converts the high voltage of the lithium battery into a low voltage of 1.5V through a voltage drop circuit board; the Chinese patent application with publication number CN204966611U and title “A 1.5V constant voltage lithium-ion battery” discloses a voltage drop circuit that can output a constant low voltage of 1.5V to achieve the same port charging and discharging function. However, none of the above-mentioned prior arts discloses a detailed internal structure, and the disclosed content is not reasonable enough. Due to the small size of No. 5 and No. 7 batteries, how to design the voltage drop circuit components and reasonably place them inside the lithium battery, and how to achieve electrical connection with the lithium battery cell is a very critical link and needs further improvement. Utility Model Content

[0005] In order to solve the technical problem that the internal structure of the existing lithium battery is not reasonable, the utility model provides a lithium battery step-down circuit component and a 1.5V lithium battery.

[0006] On the one hand, the technical solution provided by the present application is as follows: a step-down circuit assembly of a lithium battery, comprising a PCB board, on which a step-down circuit, a charging and discharging circuit and a protection circuit are integrated, the step-down circuit assembly also comprising an outer conductive cap and an inner conductive cap, a positive copper ring and a negative copper ring are provided on the front of the PCB board, the positive copper ring is electrically connected to the outer conductive cap, the outer conductive cap is used as a low-voltage output positive electrode, the negative copper ring is used as a common negative electrode, a high-voltage input copper ring is provided on the back of the PCB board, the high-voltage input copper ring is electrically connected to the inner conductive cap, and the inner conductive cap is used as a high-voltage input positive electrode.

[0007] By adopting the above technical scheme, the PCB board of the present application can adopt existing necessary circuits, such as a step-down circuit, a voltage stabilizing circuit, a charging circuit, an over-discharge protection circuit, etc. The circuit principle does not need to be improved too much, but a very large improvement has been made in the structure. By arranging a positive copper ring, a negative copper ring and a high-voltage input copper ring on the PCB board, the positive copper ring serves as a low-voltage output positive pole, the high-voltage input copper ring serves as a high-voltage input positive pole, and the negative copper ring serves as a common negative pole. The functions of high-voltage input and low-voltage output are realized through these three copper rings; the high-voltage input copper ring is then electrically connected to the inner conductive cap as a high-voltage input positive pole, the positive copper ring is then electrically connected to the outer conductive cap, the outer conductive cap is used as the output positive pole of the lithium battery, and the negative copper ring is then electrically connected to the metal shell of the lithium battery as the output negative pole of the lithium battery, so as to realize the same-port charging and discharging function, without the need to arrange any conductive cables, the electrical performance is more stable, and the internal connection structure of the lithium battery is simplified, which is safer.

[0008] Preferably, the outer conductive cap and the inner conductive cap are both soldered on the PCB board through patch welding.

[0009] Preferably, the electronic components on the PCB are centrally arranged inside the outer conductive cap and the inner conductive cap.

[0010] Preferably, the electronic components located in the outer conductive cap are capacitors, inductors and resistors, and the electronic components located in the inner conductive cap are three-in-one chips.

[0011] Preferably, a flange edge is provided at the lower end of the outer conductive cap.

[0012] Preferably, the step-down circuit assembly further comprises an elastic ring, and the elastic ring is electrically connected to the negative electrode copper ring.

[0013] Preferably, the elastic ring includes a base ring and warping pieces evenly distributed around the base ring, and the back side of the base ring is welded to the negative electrode copper ring through a patch.

[0014] On the other hand, the present application provides a technical solution: a 1.5V lithium battery, comprising a metal shell, a PVC outer skin, a wound battery cell assembly and the step-down circuit assembly of the lithium battery described above, the wound battery cell assembly and the step-down circuit assembly are both arranged in the metal shell, the positive pole ear of the wound battery cell assembly is welded to the inner conductive cap, the negative pole ear is welded to the bottom of the metal shell, the elastic ring is elastically abutted against the metal shell, and the PVC outer skin is used to wrap the metal shell.

[0015] In summary, the present application includes at least one of the following beneficial technical effects:

[0016] 1. This application is provided with an outer conductive cap and an inner conductive cap, and a positive copper ring, a negative copper ring and a high-voltage input copper ring are provided on the PCB board. No conductive cables are used, and the electrical performance is more stable;

[0017] 2. The internal structure of the lithium battery of the present application is simplified, and the internal connection structure is more reliable and safer. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a front perspective view of the step-down circuit assembly described in the embodiment of the present application;

[0019] Figure 2 is a back perspective view of the step-down circuit assembly described in the embodiment of the present application;

[0020] Figure 3 is a schematic diagram of a half-section structure of a step-down circuit assembly according to an embodiment of the present application;

[0021] Figure 4 A back perspective view of the PCB board described in the embodiment of the present application;

[0022] Figure 5 is a three-dimensional diagram of a 1.5V lithium battery according to an embodiment of the present application;

[0023] Figure 6 is a schematic diagram of a half-section structure of a 1.5V lithium battery according to an embodiment of the present application;

[0024] Figure 7 yes Figure 6 Enlarged view of point A in the middle;

[0025] Figure 8 yes Figure 6 Enlarged view of point B in the middle;

[0026] Fig. 9 It is a three-dimensional diagram of the wound battery cell assembly described in the embodiment of the present application.

[0027] Explanation of the reference numerals: 1. PCB board; 11. Positive copper ring; 12. Negative copper ring; 13. High-voltage input copper ring; 14. Electronic component; 2. Outer conductive cap; 21. Flange edge; 3. Inner conductive cap; 4. Elastic ring; 41. Base ring; 42. Warp tab; 100. Step-down circuit assembly; 200. Metal shell; 300. PVC outer skin; 400. Wound battery cell assembly; 401. Positive pole ear; 402. Negative pole ear; 500. Plastic middle frame. DETAILED DESCRIPTION

[0028] The following is combined with Figure 1-9 This application is described in further detail.

[0029] Reference Figures 1 to 4 The embodiment of the present application discloses a step-down circuit assembly 100 of a lithium battery, including a PCB board 1, on which a step-down circuit, a charging and discharging circuit, and a protection circuit are integrated. The step-down circuit assembly 100 also includes an outer conductive cap 2 and an inner conductive cap 3. A positive copper ring 11 and a negative copper ring 12 are provided on the front of the PCB board 1. The positive copper ring 11 is electrically connected to the outer conductive cap 2. The outer conductive cap 2 is used as a low-voltage output positive electrode, and the negative copper ring 12 is used as a common negative electrode. A high-voltage input copper ring 13 is provided on the back of the PCB board 1. The high-voltage input copper ring 13 is electrically connected to the inner conductive cap 3. The inner conductive cap 3 is used as a high-voltage input positive electrode.

[0030] Reference Figure 3 The outer conductive cap 2 and the inner conductive cap 3 are both soldered on the PCB board 1 through patch welding. The electronic components 14 on the PCB board 1 are centrally arranged in the outer conductive cap 2 and the inner conductive cap 3. The electronic components 14 are arranged reasonably, making full use of the internal space of the outer conductive cap 2 and the inner conductive cap 3. The electronic components 14 located in the outer conductive cap 2 are capacitors, inductors and resistors, and the electronic components 14 located in the inner conductive cap 3 are three-in-one chips. The three-in-one chip is an existing technology with the advantages of high integration and small size, and the design of the PCB board 1 is easier. The outer conductive cap 2 and the inner conductive cap 3 not only have good connection strength, reliable fixation, low resistance at the connection, and good conductivity, but also have a certain sealing performance to prevent water and dust from entering, and play a role in protecting the internal electronic components 14. The electronic components 14 will not contact the outside world and will not be damaged by collision. The lower end of the outer conductive cap 2 is provided with a flange 21. Since the outer conductive cap 2 is exposed, it is easily impacted by the outside, and the fixing strength needs to be strengthened. For this reason, the flange 21 is provided on the outer conductive cap 2. The flange 21 has a certain width, which is several times the wall thickness of the outer conductive cap 2. The welding area with the positive copper ring 11 is large, and the fixation is reliable and impact-resistant. Since the inner conductive cap 3 is not exposed, it will not be impacted by the outside, and the strength requirement is slightly lower, so there is no need to provide a flange.

[0031] Reference Figure 1 and Figure 3 The step-down circuit assembly 100 further includes an elastic ring 4, which is electrically connected to the negative copper ring 12. The elastic ring 4 includes a base ring 41 and warping pieces 42 uniformly arranged around the base ring 41, and the back of the base ring 41 is welded on the negative copper ring 12 by patch welding.

[0032] The PCB board 1 of the present application can adopt existing necessary circuits, such as a step-down circuit, a voltage stabilizing circuit, a charging circuit, an over-discharge protection circuit, etc. The circuit principle does not need to be improved too much, but a very large improvement has been made in structure. By arranging a positive copper ring 11, a negative copper ring 12 and a high-voltage input copper ring 13 on the PCB board 1, the positive copper ring 11 serves as a low-voltage output positive pole, the high-voltage input copper ring 13 serves as a high-voltage input positive pole, and the negative copper ring 12 serves as a common negative pole. The functions of high-voltage input and low-voltage output are realized through these three copper rings; the high-voltage input copper ring 13 is then electrically connected to the inner conductive cap 3 as a high-voltage input positive pole, the positive copper ring 11 is then electrically connected to the outer conductive cap 2, the outer conductive cap 2 is used as the output positive pole of the lithium battery, and the negative copper ring 12 is then electrically connected to the metal shell 200 of the lithium battery as the output negative pole of the lithium battery, so as to realize the same-port charging and discharging function, without the need to arrange any conductive cables, the electrical performance is more stable, and the internal connection structure of the lithium battery is simplified, which is safer.

[0033] Reference Figures 5 to 9 The embodiment of the present application discloses a 1.5V lithium battery, comprising a metal shell 200, a PVC outer skin 300, a wound battery cell assembly 400, a plastic middle frame 500 and the step-down circuit assembly 100 of the lithium battery described above, wherein the wound battery cell assembly 400, the plastic middle frame 500 and the step-down circuit assembly 100 are all arranged in the metal shell 200, the plastic middle frame 500 is used to support the step-down circuit assembly 100, the positive pole ear 401 of the wound battery cell assembly 400 is welded to the inner conductive cap 3, the negative pole ear 402 is welded to the bottom of the metal shell 200, the elastic ring 4 is elastically abutted against the metal shell 200, and the PVC outer skin 300 is used to wrap the metal shell 200.

[0034] The positive pole ear 401 of the wound battery cell assembly 400 is connected to the PCB board 1 through the inner conductive cap 3 and the high-voltage input copper ring 13, and the negative pole ear 402 of the wound battery cell assembly 400 is connected to the PCB board 1 through the metal shell 200, the elastic ring 4, and the negative copper ring 12. After the circuit on the PCB board 1 is reduced in voltage, the positive electrode of the lithium battery is output from the positive copper ring 11 and the outer conductive cap 2, and the negative electrode of the lithium battery is output from the negative copper ring 12, the elastic ring 4, and the metal shell 200.

[0035] The lift piece 42 of the elastic ring 4 is elastically pressed against the metal shell 200, and the elastic pressing can prevent the metal shell 200 from being loosely pressed against the negative copper ring 12 on the PCB board 1, or the negative copper ring 12 from being damaged.

[0036] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A step-down circuit assembly for a lithium battery, comprising a PCB board (1), wherein a step-down circuit, a charging and discharging circuit and a protection circuit are integrated on the PCB board (1), characterized in that: The invention also comprises an outer conductive cap (2) and an inner conductive cap (3); a positive copper ring (11) and a negative copper ring (12) are arranged on the front of the PCB board (1); the positive copper ring (11) is electrically connected to the outer conductive cap (2); the outer conductive cap (2) is used as a low-voltage output positive electrode; the negative copper ring (12) is used as a common negative electrode; a high-voltage input copper ring (13) is arranged on the back of the PCB board (1); the high-voltage input copper ring (13) is electrically connected to the inner conductive cap (3); the inner conductive cap (3) is used as a high-voltage input positive electrode.

2. The step-down circuit assembly of a lithium battery according to claim 1, characterized in that: The outer conductive cap (2) and the inner conductive cap (3) are both soldered on the PCB board (1) via patch welding.

3. The step-down circuit assembly of a lithium battery according to claim 1, characterized in that: The electronic components (14) on the PCB board (1) are centrally arranged inside the outer conductive cap (2) and the inner conductive cap (3).

4. The step-down circuit assembly of a lithium battery according to claim 3, characterized in that: The electronic components (14) located in the outer conductive cap (2) are capacitors, inductors and resistors, and the electronic components (14) located in the inner conductive cap (3) are three-in-one chips.

5. The step-down circuit assembly of a lithium battery according to claim 2, characterized in that: The lower end of the outer conductive cap (2) is provided with a flange edge (21).

6. The step-down circuit assembly of a lithium battery according to any one of claims 1 to 5, characterized in that: The step-down circuit assembly (100) further comprises an elastic ring (4), wherein the elastic ring (4) is electrically connected to the negative electrode copper ring (12).

7. The step-down circuit assembly of a lithium battery according to claim 6, characterized in that: The elastic ring (4) comprises a base ring (41) and flaps (42) evenly distributed around the base ring (41); the back of the base ring (41) is welded to the negative electrode copper ring (12) via a patch.

8. A 1.5V lithium battery, characterized in that: The invention comprises a metal shell (200), a PVC outer skin (300), a wound battery cell assembly (400) and a step-down circuit assembly (100) of a lithium battery according to claim 6, wherein the wound battery cell assembly (400) and the step-down circuit assembly (100) are both arranged in the metal shell (200), the positive pole ear (401) of the wound battery cell assembly (400) is welded to the inner conductive cap (3), the negative pole ear (402) is welded to the bottom of the metal shell (200), the elastic ring (4) is elastically abutted against the metal shell (200), and the PVC outer skin (300) is used to wrap the metal shell (200).

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