1.5v lithium battery and manufacturing method therefor

Abstract

The present application relates to a 1.5V lithium battery and a manufacturing method therefor. The lithium battery comprises a circuit component (1), a plastic frame (2), a wound battery cell assembly (3), a first metal housing (4), a second metal housing (5), a first insulating sealing member (6) and an insulating sheath (7). The wound battery cell assembly (3) is arranged inside the second metal housing (5). The first metal housing (4) and the second metal housing (5) are vertically docked and are fixed by means of circumferential welding. The circuit component (1) comprises a PCB (11), a low-voltage positive electrode cap (12), a high-voltage positive electrode connection piece (13) and a negative electrode elastic piece (14); and the circuit component (1) can stably output a low voltage of 1.5V. The upper end of the wound battery cell assembly (3) is arranged at a relatively shallow depth within the second metal housing (5), which requires the length of a positive electrode tab (31) to be shortened so that the length is insufficient for making contact with the inner wall of the metal housing, thus thoroughly solving the risk of short circuit between the positive electrode tab (31) and the metal housing. The first insulating sealing member (6) and a second insulating sealing member (8) can prevent electrolytes from leaking or entering the first metal housing (4), thereby ensuring the stability of electrical performance.

Description

1.5V lithium battery and manufacturing method thereof TECHNICAL FIELD

[0001] The present application relates to the technical field of lithium batteries, in particular to a 1.5V lithium battery and a manufacturing method thereof. BACKGROUND

[0002] A low-voltage lithium battery is disclosed in Chinese Patent Application No. CN203787480U, entitled "Cylindrical battery device with variable voltage", which converts the high voltage (3.0-4.2V) of the lithium battery into a low voltage of 1.5V through a voltage drop circuit board, thereby replacing common alkaline batteries and nickel-hydrogen batteries. The lithium battery can be widely used in various devices such as remote controllers, electric toys, electric toothbrushes, shavers, wireless microphones, doorbells, etc. The lithium battery has the advantages of no memory effect, high energy density, and long service life, and the universality is greatly improved after voltage drop. However, the structure provided in the application is unreasonable, the stability of electrical performance is not high, and it can only be considered as a conceptual innovation, which is difficult to industrialize.

[0003] Chinese Patent Application No. CN117673498A, entitled "Low-voltage lithium battery", discloses a low-voltage lithium battery that can be industrialized. In actual production, a groove is first machined on the metal shell, the wound cell assembly is fixed in the metal shell, then the positive electrode tab is pulled out and welded with the bottom wall of the inner conductive cap, and finally the plastic middle frame and the circuit assembly are placed in the metal shell. Due to the above machining process limitations, especially the wound cell assembly upper end is in a deep position in the metal shell, a longer positive electrode tab is required. However, after the lithium battery is assembled, the positive electrode tab is limited in a narrow space and the radial position is uncontrollable, which may come into contact with the inner wall of the metal shell, causing short circuit and serious safety hazards, which needs to be improved.

[0004] SUMMARY

[0005] To solve the technical problems of the existing low-voltage lithium battery, such as the length of the positive electrode tab being too long, the radial position being uncontrollable, and the risk of short circuit with the metal shell, the present application provides a 1.5V lithium battery and a manufacturing method thereof.

[0006] In one aspect, the application provides a 1.5V lithium battery, comprising a circuit assembly, a plastic frame, a winding cell assembly, a first metal shell, a second metal shell, a first insulation seal and an insulation skin, the circuit assembly and the plastic frame are arranged in the first metal shell, the plastic frame is used for fixing the circuit assembly, the winding cell assembly is arranged in the second metal shell, the first metal shell and the second metal shell are butted and fixed by circumferential welding, the first insulation seal is arranged between the first metal shell and the second metal shell and is used for sealing the second metal shell, the bottom of the first insulation seal further extends a horizontal sealing part inwardly, the horizontal sealing part is attached to the lower surface of the first metal shell to cover the lower surface of the first metal shell, the insulation skin covers the first metal shell and the second metal shell, the bottom wall of the first metal shell is provided with a clamping hole, the clamping hole is provided with a second insulation seal and a riveting part, the riveting part rivets the second insulation seal and the bottom wall of the first metal shell to seal the clamping hole, the circuit assembly comprises a PCB board, a low-voltage positive cap, a high-voltage positive connecting piece and a negative spring piece, the low-voltage positive cap, the high-voltage positive connecting piece and the negative spring piece are all welded on the PCB board, the negative spring piece is in elastic contact with the first metal shell, the high-voltage positive connecting piece is in elastic contact with the upper end of the riveting part, the positive lug of the winding cell assembly is welded with the lower end of the riveting part, and the negative lug is welded with the second metal shell.

[0007] The PCB board in the circuit assembly of the application is also provided with necessary circuits such as a voltage reduction circuit, a voltage stabilizing circuit, a charging circuit and a over-discharge protection circuit, in the above technical solution, the high-voltage positive connecting piece is used as a high-voltage positive input end, is electrically connected with the positive lug of the winding cell assembly through the riveting part, the low-voltage positive cap is used as a positive electrode of the battery, and the second metal shell is used as a negative electrode of the battery, so that 1.5V low voltage can be stably output.

[0008] The application sets the first metal shell and the second metal shell, arranges the circuit assembly and the plastic frame in the first metal shell, arranges the winding cell assembly in the second metal shell, the upper end of the winding cell assembly is shallow in the second metal shell, the length of the required positive lug is shortened, although the radial position is uncontrollable, the length is not enough to contact the inner wall of the metal shell, and short circuit is not caused. In addition, the bottom of the first insulation seal further extends a horizontal sealing part inwardly, the horizontal sealing part is attached to the lower surface of the first metal shell, the sealing performance between the first insulation seal and the first metal shell is increased, the lower surface of the first metal shell is covered, the positive lug is prevented from contacting the lower surface of the first metal shell, and short circuit is not caused, so that the risk of short circuit between the positive lug and the metal shell is completely solved.

[0009] The first insulation seal and the first metal shell completely seal the upper end of the second metal shell, preventing the winding cell assembly from moving up and down and preventing electrolyte leakage. The second insulation seal seals the clamping hole, preventing electrolyte from entering the first metal shell, and also insulating the riveting part relative to the first metal shell. The riveting part, as an intermediate conductor, outputs high voltage of the winding cell assembly to the circuit assembly.

[0010] Optionally, the lower end of the first metal shell is provided with a contraction part, and the first insulation seal is clamped between the contraction part and the second metal shell.

[0011] Optionally, the outer ring surface of the first insulation seal is provided with one or more annular protrusions to increase the sealing between the second metal shell.

[0012] Optionally, the second insulation seal is formed at the clamping hole by injection molding, the riveting part includes a rivet and a metal sheet, the metal sheet is provided with a rivet hole at the center, and the rivet and the metal sheet are riveted to press the second insulation seal and the bottom wall of the first metal shell to seal the clamping hole.

[0013] Optionally, the circuit assembly further comprises a charging interface, the charging interface is welded on the PCB board, and the first metal shell and the insulation skin are respectively provided with a first opening and a second opening at the corresponding positions.

[0014] Optionally, the plastic frame comprises an upper frame and a lower frame, and the PCB board is fixed between the upper frame and the lower frame.

[0015] Optionally, the upper end of the first metal shell is provided with a spinning edge inwardly for pressing the plastic frame, and the spinning edge is further provided with a positive and negative electrode isolation sheet above or below, and part of the upper surface of the positive and negative electrode isolation sheet is wrapped by the insulation skin.

[0016] Optionally, the low-voltage positive cap is welded on the PCB board by patching, and part of the electronic components on the PCB board are arranged in the low-voltage positive cap.

[0017] Optionally, the winding cell assembly comprises a winding cell, an upper isolation sheet and a lower isolation sheet, the positive tab is welded to the lower surface of the riveting part at the center hole of the upper isolation sheet, and the negative tab is welded to the bottom wall of the second metal shell after winding around the side surface of the winding cell.

[0018] In another aspect, the application also provides a manufacturing method of the 1.5V lithium battery described above, comprising the following steps:

[0019] S1, riveting the riveting part at the clamping hole of the bottom wall of the first metal shell to seal the clamping hole;

[0020] S2, fix the circuit assembly on the plastic frame, then put them into the first metal shell, make the high-voltage positive connection sheet of the circuit assembly and the riveting piece in elastic contact, and make the negative sheet of the circuit assembly and the first metal shell in elastic contact to realize electrical connection;

[0021] S3, make a spinning edge on the upper end of the first metal shell, and press the plastic frame in the first metal shell;

[0022] S4, set the first insulation sealing piece on the first metal shell, put the winding cell assembly into the second metal shell, and weld the positive lug of the winding cell assembly on the bottom surface of the riveting piece;

[0023] S5, press the first insulation sealing piece and the lower end of the first metal shell into the second metal shell, and perform circumferential welding on the first metal shell and the second metal shell;

[0024] S6, set the insulation outer skin, heat and shrink, and wrap the insulation outer skin on the first metal shell and the second metal shell.

[0025] In summary, the present application includes at least one of the following beneficial technical effects:

[0026] The PCB in the circuit assembly of the present application is also provided with necessary circuits such as voltage reduction circuit, voltage stabilization circuit, charging circuit, and over-discharge protection circuit, which can stably output 1.5V low voltage.

[0027] 1. The present application sets the first metal shell and the second metal shell, the position of the upper end of the winding cell assembly in the second metal shell is shallow, the length of the required positive lug is shortened, although the radial position is also uncontrollable, but the length is not enough to contact the inner wall of the metal shell, which completely solves the risk of short circuit of the positive lug and the metal shell.

[0028] 2. The first insulation sealing piece can prevent the electrolyte from leaking outward, and the second insulation sealing piece prevents the electrolyte from entering the first metal shell, ensuring the stability of the electrical performance. BRIEF DESCRIPTION OF DRAWINGS

[0029] Fig. 1 is a perspective view of the 1.5V lithium battery according to the first embodiment of the present application;

[0030] Fig. 2 is a semi-partial structure schematic view of the 1.5V lithium battery according to the first embodiment of the present application;

[0031] Fig. 3 is an enlarged view of A in Fig. 2;

[0032] Fig. 4 is a whole assembly action schematic view of the 1.5V lithium battery according to the first embodiment of the present application;

[0033] Fig. 5 is an assembly action schematic view of putting the circuit assembly and the plastic frame into the first metal shell in the first embodiment of the present application;

[0034] Fig. 6 is a schematic view of the assembling action of riveting the second insulation sealing member to the second metal shell by the riveting member in the first embodiment of the present application;

[0035] Fig. 7 is a schematic view of the assembling action of assembling the winding cell assembly into the second metal shell in the first embodiment of the present application;

[0036] Fig. 8 is a schematic view of the structure of the circuit assembly in the first embodiment of the present application;

[0037] Fig. 9 is a schematic view of the structure of the first insulation sealing member in the first embodiment of the present application;

[0038] Fig. 10 is a schematic view of the action of welding the positive tab to the riveting member in the first embodiment of the present application;

[0039] Fig. 11 is a schematic view of the action of assembling the first metal shell and the first insulation sealing member into the second metal shell in the first embodiment of the present application;

[0040] Fig. 12 is a schematic view of the circumferential welding of the first metal shell and the second metal shell in the first embodiment of the present application;

[0041] Fig. 13 is a perspective view of the 1.5V lithium battery in the second embodiment of the present application;

[0042] Fig. 14 is a schematic view of the half cut structure of the 1.5V lithium battery in the second embodiment of the present application;

[0043] Fig. 15 is an enlarged view of B in Fig. 14.

[0044] Reference signs: 1, circuit assembly; 11, PCB board; 12, low-voltage positive cap; 13, high-voltage positive connecting tab; 14, negative spring; 15, charging interface; 16, elastic conductive member; 2, plastic frame; 21, upper frame; 22, lower frame; 3, winding cell assembly; 31, positive tab; 32, negative tab; 33, winding cell; 34, upper isolation sheet; 35, lower isolation sheet; 4, first metal shell; 41, clamping hole; 42, shrinkage part; 43, first opening; 44, spinning edge; 5, second metal shell; 6, first insulation sealing member; 61, horizontal sealing part; 62, annular protrusion; 7, insulation skin; 71, second opening; 8, second insulation sealing member; 9, riveting member; 91, rivet; 92, metal sheet; 10, positive and negative isolation sheet; 100, circumferential welding. DETAILED DESCRIPTION

[0045] The present application will be further described in detail below with reference to Figs. 1-15.

[0046] Embodiment I:

[0047] With reference to FIGS. 1-3, the application discloses a 1.5V lithium battery, specifically an AA battery, comprising a circuit assembly 1, a plastic frame 2, a wound cell assembly 3, a first metal shell 4, a second metal shell 5, a first insulating seal 6, and an insulating outer skin 7. The circuit assembly 1 and the plastic frame 2 are arranged in the first metal shell 4, the plastic frame 2 is used to fix the circuit assembly 1, and the wound cell assembly 3 is arranged in the second metal shell 5. The first metal shell 4 and the second metal shell 5 are butted together and fixed by circumferential welding. The first insulating seal 6 is arranged between the first metal shell 4 and the second metal shell 5 and is used to seal the second metal shell 5. The bottom of the first insulating seal 6 further extends inwardly to form a horizontal sealing portion 61, which is attached to the lower surface of the first metal shell 4 to cover the lower surface of the first metal shell 4. The insulating outer skin 7 covers the first metal shell 4 and the second metal shell 5. The bottom wall of the first metal shell 4 is provided with a clamping hole 41, the clamping hole 41 is provided with a second insulating seal 8 and a rivet 9, and the rivet 9 is used to rivet the second insulating seal 8 and the bottom wall of the first metal shell 4 to seal the clamping hole 41.

[0048] The insulating outer skin 7 is preferably made of PVC material and is wrapped on the first metal shell 4 and the second metal shell 5 by heat shrinking.

[0049] With reference to FIGS. 3 and 4, in this embodiment, the outer diameters of the first metal shell 4 and the second metal shell 5 are the same, and the first insulating seal 6 cannot be arranged directly. Therefore, a contraction portion 42 is arranged at the lower end of the first metal shell 4, and the first insulating seal 6 is clamped between the contraction portion 42 and the second metal shell 5, which can effectively prevent the leakage of electrolyte. The outer ring surface of the first insulating seal 6 is provided with one or more annular protrusions 62, which can increase the sealing between the first insulating seal 6 and the second metal shell 5.

[0050] With reference to FIG. 5, the plastic frame 2 comprises an upper frame 21 and a lower frame 22, and the PCB board 11 is fixed between the upper frame 21 and the lower frame 22. The upper frame 21 and the lower frame 22 can be fixed by point gluing, buckling, or without fixing.

[0051] With reference to FIG. 5, the upper end of the first metal shell 4 is provided with a spinning edge 44, which is used to press the plastic frame 2. The spinning edge 44 is further provided with a positive-negative electrode isolation sheet 10, and part of the upper surface of the positive-negative electrode isolation sheet 10 is wrapped by the insulating outer skin 7, which can effectively prevent the positive-negative electrode isolation sheet 10 from falling off.

[0052] Referring to FIG. 3 and FIG. 6, the second insulating seal 8 is formed at the card hole 41 by injection molding. The riveting piece 9 includes a rivet 91 and a metal sheet 92, the metal sheet 92 is provided with a rivet hole in the center, and the rivet 91 and the metal sheet 92 are riveted to press the second insulating seal 8 and the bottom wall of the first metal shell 4 to seal the card hole 41, and the electrolyte cannot penetrate into the first metal shell 4 from the card hole 41. The riveting piece 9 penetrates through the card hole 41 of the first metal shell 4 and is insulated relative to the first metal shell 4, and utilizes its own conductivity to form an electrical connection between the high-voltage positive connection piece 13 and the positive lug 31, thereby providing a high-voltage power input for the circuit assembly 1. Since the size of the second insulating seal 8 is very small, it is very difficult to assemble manually, which is time-consuming and laborious, and it is easy to install out of position, affecting the insulation and sealing effect. Therefore, the second insulating seal 8 is formed at the card hole 41 by injection molding, and the position and size, shape of the second insulating seal 8 are more accurate, and thus the sealing and insulation are more reliable.

[0053] Referring to FIG. 5 and FIG. 8, the circuit assembly 1 includes a PCB board 11, a low-voltage positive cap 12, a high-voltage positive connection piece 13, and a negative spring piece 14, all of which are welded on the PCB board 11. The negative spring piece 14 is in elastic contact with the first metal shell 4, the high-voltage positive connection piece 13 is in elastic contact with the upper end of the riveting piece 9, the positive lug 31 of the wound battery cell assembly 3 is welded with the lower end of the riveting piece 9, and the negative lug 32 is welded with the second metal shell 5. Referring to FIG. 4 and FIG. 5, the circuit assembly 1 of the embodiment further includes a charging interface 15, specifically a TYPE-C interface, which is welded on the PCB board 11. The first metal shell 4 and the insulating skin 7 are respectively provided with a first opening 43 and a second opening 71 at the corresponding positions. The first metal shell 4 and the second metal shell 5 are used as a common negative electrode.

[0054] Referring to FIG. 5, the low-voltage positive cap 12 is patch-welded on the PCB board 11, which has good connection strength and reliable fixation, and has a large cross-sectional area at the connection, small resistance, and good conductivity. Part of the electronic components on the PCB board 11 are preferably arranged in the low-voltage positive cap 12. The electronic components are arranged reasonably, and the internal space of the low-voltage positive cap 12 is fully utilized.

[0055] Referring to FIG. 7, the winding cell assembly 3 includes a winding cell 33, an upper isolation sheet 34 and a lower isolation sheet 35, the positive electrode tab 31 is welded to the lower surface of the rivet 9 from the center hole of the upper isolation sheet 34; the negative electrode tab 32 is welded to the bottom wall of the second metal shell 5 from the side of the winding cell 33. The winding cell 33 is directly placed in the second metal shell 5, which is one less layer of wrapping shell than the soft package lithium cell or hard shell lithium cell in the prior art, and the cost is lower.

[0056] The specific connection principle of the circuit is: the positive electrode tab 31 of the winding cell assembly 3 is connected to the PCB board 11 through the rivet 9 and the high-voltage positive connection sheet 13, the negative electrode tab 32 of the winding cell assembly 3 is connected to the PCB board 11 through the second metal shell 5, the first metal shell 4 and the negative electrode sheet 14, and after the voltage reduction treatment of the circuit on the PCB board 11, the 1.5V positive voltage is output from the low-voltage positive cap 12, and the negative electrode of the lithium battery is output from the second metal shell 5.

[0057] The manufacturing method of the 1.5V lithium battery described in the embodiment includes the following steps:

[0058] S1, rivet the rivet 9 at the card hole 41 of the bottom wall of the first metal shell 4 to seal the card hole 41;

[0059] S2, fix the circuit assembly 1 on the plastic frame 2, and then put them into the first metal shell 4 together, so that the high-voltage positive connection sheet 13 in the circuit assembly 1 is in elastic contact with the rivet 9, and the negative electrode sheet 14 in the circuit assembly 1 is in elastic contact with the first metal shell 4, so as to realize electrical connection;

[0060] S3, make a spinning edge 44 at the upper end of the first metal shell 4, and press the plastic frame 2 tightly in the first metal shell 4;

[0061] S4, set the first insulation sealing piece 6 on the first metal shell 4, put the winding cell assembly 3 into the second metal shell 5, and weld the positive electrode tab 31 of the winding cell assembly 3 to the bottom surface of the rivet 9;

[0062] S5, press the lower end of the first insulation sealing piece 6 and the first metal shell 4 into the second metal shell 5, and circumferentially weld 100 the first metal shell 4 and the second metal shell 5;

[0063] S6, paste the positive and negative electrode isolation sheet 10 on the spinning edge 44, set the insulation outer skin 7, heat and shrink to make the insulation outer skin 7 wrap the first metal shell 4 and the second metal shell 5.

[0064] The manufacturing method described in the application has reasonable process, high yield, and can be industrialized and mass produced.

[0065] The PCB 11 in the circuit assembly 1 of the application is also provided with necessary circuits such as a voltage reduction circuit, a voltage stabilizing circuit, a charging circuit, and a over-discharge protection circuit, the high-voltage positive connection piece 13 is electrically connected with the positive tab 31 of the winding cell assembly 3 through the riveting piece 9 as a high-voltage positive input end, the low-voltage positive cap 12 is a positive electrode of the battery, and the second metal shell 5 is a negative electrode of the battery, so that 1.5V low voltage can be stably output.

[0066] The first metal shell 4 and the second metal shell 5 are arranged, the circuit assembly 1 and the plastic frame 2 are arranged in the first metal shell 4, and the winding cell assembly 3 is arranged in the second metal shell 5, so that the upper end of the winding cell assembly 3 is shallow in the second metal shell 5, the positive tab 31 needed is also short, although the radial position is still uncontrollable, the length is insufficient to contact the inner wall of the metal shell, and short circuit is not caused. In addition, the bottom of the first insulation sealing piece 6 further extends a horizontal sealing part 61 inward, the horizontal sealing part 61 is attached to the lower surface of the first metal shell 4, not only can increase the sealing performance between the first insulation sealing piece 6 and the first metal shell 4, but also can cover the lower surface of the first metal shell 4, prevent the positive tab 31 from contacting the lower surface of the first metal shell 4, and short circuit is not caused, so that the risk of short circuit of the positive tab 31 and the metal shell is completely solved.

[0067] The first insulation sealing piece 6 and the first metal shell 4 completely seal the upper end of the second metal shell 5, prevent the winding cell assembly 3 from moving up and down, and prevent electrolyte from leaking; the second insulation sealing piece 8 seals the clamping hole 41, prevents electrolyte from entering the first metal shell 4, and also makes the riveting piece 9 insulated relative to the first metal shell 4, the riveting piece 9 serves as an intermediate conductor and outputs high voltage of the winding cell assembly 3 to the circuit assembly.

[0068] Embodiment two:

[0069] When the low-voltage lithium battery is a AAA battery, because the width of the TYPE-C interface is large and the diameter of the AAA battery is small, it is difficult to be placed horizontally, so it is placed vertically, and the corresponding PCB 11 is also placed vertically. If the prior art technical solution is used, the winding cell assembly 3 is deeper in the metal shell, the positive tab 31 needed is longer, and short circuit with the metal shell is more likely to occur.

[0070] Referring to FIGS. 13-15, the difference between the present embodiment and embodiment one is that the low-voltage lithium battery is a AAA battery, the TYPE-C interface and the PCB 11 are vertically placed, and the low-voltage positive cap 12 is placed on the plastic frame 2 and is not directly welded with the PCB 11, so that the elastic conductive piece 16 is arranged on the PCB 11, the elastic conductive piece 16 is in contact with the inner wall of the low-voltage positive cap 12, and the positive output of 1.5V low voltage is realized. The elastic conductive piece 16 can be a spring or a spring.

[0071] In the embodiment, the positive and negative electrode isolation sheet 10 is arranged below the spinning edge 44, effectively preventing the positive and negative electrode isolation sheet 10 from falling off. The manufacturing method needs to put the positive and negative electrode isolation sheet 10 into the first metal shell 4 first in step S2, and then make the spinning edge 44. Other structures and beneficial effects are consistent with embodiment one, and the technical solutions described in this application are more prominent in this embodiment.

[0072] The above are preferred embodiments of the application, which do not limit the protection scope of the application, therefore: all equivalent changes made according to the structure, shape, principle of the application should be covered within the protection scope of the application.

Claims

1. A 1.5V lithium battery, characterized in that: The invention comprises a circuit assembly (1), a plastic frame (2), a wound cell assembly (3), a first metal shell (4), a second metal shell (5), a first insulating seal (6) and an insulating outer skin (7); the circuit assembly (1) and the plastic frame (2) are arranged in the first metal shell (4); the plastic frame (2) is used to fix the circuit assembly (1); the wound cell assembly (3) is arranged in the second metal shell (5); the first metal shell (4) and the second metal shell (5) are butted up and down and fixed by circumferential welding; the first insulating seal (6) is arranged between the first metal shell (4) and the second metal shell (5) and is used to seal the second metal shell (5); the bottom of the first insulating seal (6) also extends inward to form a horizontal sealing portion (61); the horizontal sealing portion (61) is in contact with the lower surface of the first metal shell (4) to cover the lower surface of the first metal shell (4); the insulating outer skin (7) covers the outside of the first metal shell (4) and the second metal shell (5); A clamping hole (41) is provided on the bottom wall of the first metal shell (4), and a second insulating seal (8) and a rivet (9) are provided at the clamping hole (41), and the rivet (9) rivets the second insulating seal (8) and the bottom wall of the first metal shell (4) to seal the clamping hole (41); The circuit assembly (1) comprises a PCB board (11), a low-voltage positive electrode cap (12), a high-voltage positive electrode connecting piece (13) and a negative electrode spring piece (14); the low-voltage positive electrode cap (12), the high-voltage positive electrode connecting piece (13) and the negative electrode spring piece (14) are all welded to the PCB board (11); the negative electrode spring piece (14) is in elastic contact with the first metal shell (4); the high-voltage positive electrode connecting piece (13) is in elastic contact with the upper end of the rivet (9); the positive electrode tab (31) of the wound battery cell assembly (3) is welded to the lower end of the rivet (9); and the negative electrode tab (32) is welded to the second metal shell (5).

2. The 1.5V lithium battery according to claim 1, characterized in that A contraction portion (42) is provided at the lower end of the first metal shell (4), and the first insulating seal (6) is partially clamped between the contraction portion (42) and the second metal shell (5).

3. The 1.5V lithium battery according to claim 2, characterized in that: The outer annular surface of the first insulating seal (6) is provided with one or more annular protrusions (62) to enhance the sealing performance between the first insulating seal (6) and the second metal shell (5).

4. The 1.5V lithium battery according to claim 1, characterized in that The second insulating seal (8) is formed at the clamping hole (41) by injection molding, and the riveting part (9) includes a rivet (91) and a metal sheet (92). A rivet hole is provided at the center of the metal sheet (92). The rivet (91) and the metal sheet (92) are riveted together to press the second insulating seal (8) and the bottom wall of the first metal shell (4) to seal the clamping hole (41).

5. The 1.5V lithium battery according to claim 1, characterized in that: The circuit assembly (1) further comprises a charging interface (15), wherein the charging interface (15) is welded on the PCB board (11), and a first opening (43) and a second opening (71) are respectively provided at corresponding positions of the first metal shell (4) and the insulating outer skin (7).

6. The 1.5V lithium battery according to claim 1, characterized in that: The plastic frame (2) comprises an upper frame (21) and a lower frame (22), and the PCB board (11) is fixed between the upper frame (21) and the lower frame (22).

7. The 1.5V lithium battery according to claim 1, characterized in that: A spun edge (44) is provided inwardly at the upper end of the first metal shell (4) for pressing the plastic frame (2). A positive and negative electrode separator (10) is also provided above or below the spun edge (44). Part of the upper surface of the positive and negative electrode separator (10) is also wrapped by an insulating outer skin (7).

8. The 1.5V lithium battery according to claim 1, characterized in that: The low-voltage positive electrode cap (12) is soldered on a PCB board (11) through patch welding, and some electronic components on the PCB board (11) are arranged inside the low-voltage positive electrode cap (12).

9. The 1.5V lithium battery according to claim 1, characterized in that: The wound battery cell assembly (3) comprises a wound battery cell (33), an upper separator (34) and a lower separator (35); the positive electrode tab (31) extends through the central hole of the upper separator (34) and is welded to the lower surface of the rivet (9); the negative electrode tab (32) is wound from the side of the wound battery cell (33) to the bottom surface and is welded to the bottom wall of the second metal shell (5).

10. A method for manufacturing a 1.5V lithium battery according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1, riveting a rivet (9) to a clamping hole (41) on the bottom wall of the first metal shell (4) to seal the clamping hole (41); S2, fixing the circuit assembly (1) on the plastic frame (2), and then installing them together into the first metal shell (4), so that the high-voltage positive electrode connecting piece (13) in the circuit assembly (1) is in elastic contact with the rivet (9), and the negative electrode spring (14) in the circuit assembly (1) is in elastic contact with the first metal shell (4), so as to achieve electrical connection; S3, making a spinning edge (44) at the upper end of the first metal shell (4), and pressing the plastic frame (2) into the first metal shell (4); S4, sleeve the first insulating seal (6) on the first metal shell (4), install the wound battery cell assembly (3) into the second metal shell (5), and weld the positive electrode tab (31) of the wound battery cell assembly (3) to the bottom surface of the rivet (9); S5, pressing the first insulating seal (6) and the lower end of the first metal shell (4) into the second metal shell (5), and performing circumferential welding on the first metal shell (4) and the second metal shell (5); S6, putting on the insulating outer skin (7), heating and shrinking it, so that the insulating outer skin (7) is wrapped around the first metal shell (4) and the second metal shell (5).

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