1.5 v lithium battery and manufacturing method thereof

Abstract

To provide a low-voltage lithium battery and a manufacturing method thereof, capable of avoiding the risk of a short circuit between a positive electrode tab and a metal shell.SOLUTION: There is provided a 1.5 V lithium battery including a circuit assembly 1, a resin frame 2, a wound battery cell assembly 3, a first metal shell 4, a second metal shell 5, a first insulating seal 6 and an insulating sheath 7. The wound battery cell assembly is arranged in the second metal shell. The first metal shell and the second metal shell are in vertical butt connection and fixed by circumferential welding. The circuit assembly includes a PCB, a low-voltage positive electrode cap, a high-voltage positive connecting piece and a negative electrode metal dome. In the present application, the circuit assembly can stably output a low voltage of 1.5 V. An upper end of the wound battery cell assembly is at a shallow position in the second metal shell, the required length of the positive electrode tab is shortened, the positive tab is not long enough to contact an inner wall of the metal shell, and the risk of a short circuit between the positive electrode tab and a metal shell is thus avoided.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present application relates to the technical field of lithium batteries, and in particular to 1.5V lithium batteries and methods for manufacturing the same. [Background technology]

[0002] The Chinese patent application, publication number CN203787480U, entitled "Variable Voltage Cylindrical Battery Device," discloses a low-voltage lithium battery that uses a voltage-reduction circuit board to convert the high voltage (3.0-4.2V) of a lithium battery to a low voltage of 1.5V, thereby replacing common alkaline and nickel-metal hydride batteries. When manufactured to fit AA and AAA battery sizes, the battery can be widely used in a variety of devices, including remote controls, electric toys, electric toothbrushes, shavers, wireless microphones, and doorbells. Lithium batteries have the advantages of no memory effect, high energy density, and long service life, and their versatility is greatly improved after voltage reduction. However, the structure proposed in this application is not rational and has poor electrical performance stability, making it merely a conceptual innovation and difficult to industrialize.

[0003] The Chinese patent application, publication number CN117673498A, entitled "Low-Voltage Lithium Battery," discloses an industrializable low-voltage lithium battery in which, in actual production, a roll groove is first machined into the metal shell, a wound battery cell assembly is fixed inside the metal shell, and then a resin middle frame and circuit assembly are disposed inside the metal shell by pulling out the positive tab and welding it to the bottom wall of the inner conductive cap. Due to the constraints of the above processing process, particularly because the upper end of the wound battery assembly is located deep inside the metal shell, a long positive tab is required. After the lithium battery is assembled, the positive tab is confined to a narrow space, making it impossible to control its radial position, which could cause it to come into contact with the inner wall of the metal shell, resulting in a short circuit and a serious safety risk. This leaves room for improvement. Summary of the Invention

[0004] The present invention provides a 1.5V lithium battery and its manufacturing method to solve the technical problem that the positive electrode tab of conventional low-voltage lithium batteries is long, the radial position of which cannot be controlled, and the risk of short-circuiting with the metal shell.

[0005] In one aspect, the present application provides a 1.5V lithium battery comprising a circuit assembly, a resin frame, a wound battery cell assembly, a first metal shell, a second metal shell, a first insulating seal, and an insulating outer skin, wherein the circuit assembly and resin frame are disposed within the first metal shell, the resin frame is for fixing the circuit assembly, the wound battery cell assembly is disposed within the second metal shell, the first metal shell and the second metal shell are butted together and fixed by a full-circumference weld, the first insulating seal is disposed between the first metal shell and the second metal shell and for sealing the second metal shell, a horizontal seal portion extends inward from the bottom of the first insulating seal, the horizontal seal portion is attached to the underside of the first metal shell and covers the underside of the first metal shell, and the insulating outer skin is disposed between the first metal shell and the second metal shell. and a second metal shell, the bottom wall of the first metal shell having a fastening hole, the fastening hole having a second insulating seal and a rivet connecting piece disposed therein, the rivet connecting piece riveting the second insulating seal to the bottom wall of the first metal shell to seal the fastening hole, the circuit assembly having a PCB board, a low-voltage positive cap, a high-voltage positive connecting piece, and a negative metal dome, the low-voltage positive cap, the high-voltage positive connecting piece, and the negative metal dome are all welded to the PCB board, the negative metal dome being in elastic contact with the first metal shell, and the high-voltage positive connecting piece being in elastic contact with an upper end of the rivet connecting piece, the positive tab of the wound battery cell assembly being welded to a lower end of the rivet connecting piece, and the negative tab being welded to the second metal shell.

[0006] The PCB board in the circuit assembly of this application is also provided with necessary circuits such as a step-down circuit, a voltage stabilization circuit, a charging circuit, and an over-discharge protection circuit. In the above technical solution, the high-voltage positive connection piece serves as the high-voltage positive input terminal, and is electrically connected to the positive tab of the wound battery cell assembly via the rivet connection part. The low-voltage positive cap serves as the battery positive electrode, and the second metal shell serves as the battery negative electrode, so as to stably output a low voltage of 1.5V.

[0007] In this application, a first metal shell and a second metal shell are provided, a circuit assembly and a resin frame are provided within the first metal shell, and a wound battery cell assembly is provided within the second metal shell. The upper end of the wound battery cell assembly is positioned shallowly within the second metal shell, resulting in a short length for the required positive tab, and its radial position cannot be controlled. However, the length is not long enough to cause contact with the inner wall of the metal shell, preventing a short circuit. In addition, a horizontal seal extends inward from the bottom of the first insulating seal, and the horizontal seal is attached to the underside of the first metal shell. This not only improves the sealing performance between the first insulating seal and the first metal shell, but also covers the underside of the first metal shell, preventing contact between the positive tab and the underside of the first metal shell and preventing a short circuit, thereby thoroughly eliminating the risk of a short circuit between the positive tab and the metal shell.

[0008] The first insulating seal and the first metal shell completely seal the upper end of the second metal shell, preventing the wound battery cell assembly from moving up and down and preventing electrolyte leakage. The second insulating seal seals the fastening hole, preventing electrolyte from entering the first metal shell, and can also insulate the rivet connection component from the first metal shell. The rivet connection component acts as an intermediate conductor, outputting the high voltage of the wound battery cell assembly to the circuit assembly.

[0009] Preferably, a contracted portion is provided at the lower end of the first metal shell, and a portion of the first insulating seal is sandwiched between the contracted portion and the second metal shell.

[0010] Preferably, the outer annular surface of the first insulating seal is provided with one or more annular bulges to improve the sealing performance between the first insulating seal and the second metal shell.

[0011] Preferably, the second insulating seal is formed with a stop hole by injection molding, the rivet connection part comprises a rivet and a metal sheet, a rivet hole is provided in the center of the metal sheet, and the rivet is riveted to the metal sheet to press the second insulating seal and the bottom wall of the first metal shell together to seal the stop hole.

[0012] Preferably, the circuit assembly further includes a charging interface, the charging interface is welded to the PCB board, and the first metal shell and the insulating outer cover are provided at corresponding positions with a first opening and a second opening, respectively.

[0013] Preferably, the resin frame comprises an upper frame and a lower frame, and the PCB board is fixed between the upper frame and the lower frame.

[0014] Preferably, the first metal shell has a spinning edge at its upper end for pressing the resin frame inward, and positive and negative electrode insulating sheets are further provided above or below the spinning edge, and a portion of the upper surface of the positive and negative electrode insulating sheets is also covered by an insulating outer skin.

[0015] Preferably, the low-voltage positive cap is welded to the PCB board by a patch, and some electronic elements on the PCB board are laid out within the low-voltage positive cap.

[0016] Preferably, the wound battery cell assembly comprises a wound battery cell, an upper insulating sheet, and a lower insulating sheet, the positive electrode tab passes through a central hole in the upper insulating sheet and has an end welded to the lower surface of the rivet connection component, and the negative electrode tab wraps around from the side to the bottom surface of the wound battery cell and has an end welded to the bottom wall of the second metal shell.

[0017] In another aspect, the present application provides a method for manufacturing a method of a medical device comprising: S1: riveting the rivet connection part into the fastening hole in the bottom wall of the first metal shell to seal the fastening hole; S2: fixing the circuit assembly to a resin frame, and then inserting them into a first metal shell, so that the high-voltage positive connection piece of the circuit assembly is elastically contacted with the rivet connection part, and the negative metal dome of the circuit assembly is elastically contacted with the first metal shell, thereby achieving electrical connection; (S3) forming a spinning edge on the upper end of the first metal shell and pressing the resin frame into the first metal shell; S4: fitting a first insulating seal onto the first metal shell, inserting the wound battery cell assembly into the second metal shell, and welding a positive electrode tab of the wound battery cell assembly to a bottom surface of the rivet connection part; S5: press-fitting the lower ends of the first insulating seal and the first metal shell into the second metal shell, and performing full-circumferential welding on the first metal shell and the second metal shell; S6: providing an insulating outer shell, heat shrinking the insulating outer shell, and enclosing the insulating outer shell on the first metal shell and the second metal shell.

[0018] In summary, the present application includes at least one of the following beneficial technical effects:

[0019] The PCB board in the circuit assembly of this application is also provided with necessary circuits such as a step-down circuit, a voltage stabilization circuit, a charging circuit, and an over-discharge protection circuit, and is capable of stably outputting a low voltage of 1.5V.

[0020] 1. In this application, a first metal shell and a second metal shell are provided. The upper end of the wound battery cell assembly is positioned shallowly in the second metal shell. This shortens the required length of the positive electrode tab, and the radial position cannot be controlled. However, the length is not so long that it contacts the inner wall of the metal shell, thoroughly eliminating the risk of a short circuit between the positive electrode tab and the metal shell.

[0021] 2. The first insulating seal can prevent the electrolyte from leaking out, and the second insulating seal can prevent the electrolyte from entering the first metal shell, ensuring the stability of electrical performance. [Brief explanation of the drawings]

[0022] [Figure 1] FIG. 1 is a perspective view of the 1.5V lithium battery of Example 1 of the present application. [Figure 2] FIG. 2 is a schematic diagram of the half cross-sectional structure of the 1.5V lithium battery of Example 1 of the present application. [Figure 3] FIG. 3 is an enlarged view of part A in FIG. [Figure 4] FIG. 4 is a schematic diagram of the overall assembly operation of the 1.5V lithium battery according to the first embodiment of the present application. [Figure 5] FIG. 5 is a schematic view of an assembly operation in which the circuit assembly and the resin frame are inserted into the first metal shell in the first embodiment of the present application. [Figure 6] FIG. 6 is a schematic view of an assembly operation for riveting the second insulating seal to the second metal shell by the rivet connecting component in the first embodiment of the present application. [Figure 7] FIG. 7 is a schematic diagram of an assembly operation for inserting the wound battery cell assembly of the first embodiment of the present application into a second metal shell. [Figure 8] FIG. 8 is a structural schematic diagram of the circuit assembly in Example 1 of the present application. [Figure 9] FIG. 9 is a structural schematic diagram of the first insulating seal according to the first embodiment of the present application. [Figure 10] FIG. 10 is a schematic diagram of the operation of welding the positive electrode tab to the rivet connection part in the first embodiment of the present application. [Figure 11] FIG. 11 is a schematic diagram illustrating the operation of inserting the first metal shell and the first insulating seal into the second metal shell according to the first embodiment of the present application. [Figure 12] FIG. 12 is a schematic view showing the full-circumferential welding of the first metal shell and the second metal shell in the first embodiment of the present application. [Figure 13] FIG. 13 is a perspective view of the 1.5V lithium battery of Example 2 of the present application. [Figure 14] FIG. 14 is a schematic diagram of a half cross-sectional structure of the 1.5V lithium battery of Example 2 of the present application. [Figure 15]FIG. 15 is an enlarged view of part B in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0023] The present application will now be described in more detail with reference to FIGS. Example 1:

[0024] 1 to 3, an embodiment of the present application discloses a 1.5V lithium battery, specifically an AA battery, including a circuit assembly 1, a resin frame 2, a wound battery cell assembly 3, a first metal shell 4, a second metal shell 5, a first insulating seal 6, and an insulating outer jacket 7. The circuit assembly 1 and resin frame 2 are housed within the first metal shell 4, the resin frame 2 serves to secure the circuit assembly 1, and the wound battery cell assembly 3 is housed within the second metal shell 5. The first metal shell 4 and the second metal shell 5 are butted together and secured by a full-circumference weld. The first insulating seal 6 is disposed between the first metal shell 4 and the second metal shell 5 to seal the second metal shell 5. A horizontal seal 61 extends inward from the bottom of the first insulating seal 6, and the horizontal seal 61 is attached to and covers the underside of the first metal shell 4. The insulating outer jacket 7 is wrapped around the first metal shell 4 and the second metal shell 5. A stop hole 41 is provided in the bottom wall of the first metal shell 4, and a second insulating seal 8 and a rivet connection part 9 are provided in the stop hole 41, and the rivet connection part 9 rivets the second insulating seal 8 and the bottom wall of the first metal shell 4 to seal the stop hole 41.

[0025] The insulating outer shell 7 is preferably made of a PVC material, and is wrapped around the first metal shell 4 and the second metal shell 5 by heat shrinkage.

[0026] 3 and 4, in this embodiment, the first metal shell 4 and the second metal shell 5 have the same outer diameter, and if they were directly butted together, the first insulating seal 6 could not be placed thereon. Therefore, a contracted portion 42 is provided at the lower end of the first metal shell 4, and a portion of the first insulating seal 6 is sandwiched between the contracted portion 42 and the second metal shell 5, thereby effectively preventing electrolyte leakage. One or more annular bulges 62 are provided on the outer annular surface of the first insulating seal 6 to improve the seal between it and the second metal shell 5.

[0027] Referring to Figure 5, the resin frame 2 has an upper frame 21 and a lower frame 22, and the PCB board 11 is arranged between the upper frame 21 and the lower frame 22, and the upper frame 21 and the lower frame 22 may be fixed by adhesive, by fasteners, or not at all.

[0028] Referring to FIG. 5, the first metal shell 4 has a spinning edge 44 at its upper end for pressing the resin frame 2 inward, and the positive and negative electrode insulating sheets 10 are further attached above the spinning edge 44. Part of the upper surface of the positive and negative electrode insulating sheets 10 is covered with an insulating outer skin 7, which effectively prevents the positive and negative electrode insulating sheets 10 from coming off.

[0029] 3 and 6 , the second insulating seal 8 is formed with a stop hole 41 by injection molding. The rivet connection part 9 includes a rivet 91 and a metal sheet 92. The metal sheet 92 has a rivet hole in its center. The rivet 91 is riveted to the metal sheet 92, pressing the second insulating seal 8 against the bottom wall of the first metal shell 4 to seal the stop hole 41 and prevent electrolyte from penetrating into the first metal shell 4 through the stop hole 41. The rivet connection part 9 passes through the stop hole 41 of the first metal shell 4, is insulated from the first metal shell 4, and electrically connects the high-voltage positive connection piece 13 and the positive electrode tab 31 through its own conductivity, thereby providing high-voltage power input to the circuit assembly 1. Because the second insulating seal 8 is very small, manual assembly is very difficult, requiring time and effort. It is also prone to incorrect installation, which can affect the insulation and sealing effects. For this reason, in this application, the second insulating seal 8 is molded with the stop hole 41 using injection molding, which makes the position, dimensions and shape of the second insulating seal 8 more accurate, thereby further ensuring sealing and insulation.

[0030] 5 and 8, the circuit assembly 1 includes a PCB board 11, a low-voltage positive electrode cap 12, a high-voltage positive connection piece 13, and a negative electrode metal dome 14, all of which are welded to the PCB board 11. The negative electrode metal dome 14 is in elastic contact with the first metal shell 4, and the high-voltage positive connection piece 13 is in elastic contact with the upper end of the rivet connection piece 9. The positive electrode tab 31 of the wound battery cell assembly 3 is welded to the lower end of the rivet connection piece 9, and the negative electrode tab 32 is welded to the second metal shell 5. Referring to FIGS. 4 and 5, the circuit assembly 1 of this embodiment further includes a charging interface 15, specifically a TYPE-C interface, which is welded to the PCB board 11. The first metal shell 4 and the insulating jacket 7 are provided with a first opening 43 and a second opening 71 at corresponding positions, respectively. The first metal shell 4 and the second metal shell 5 are used as a common negative electrode.

[0031] 5, the low-voltage positive electrode cap 12 is welded to the PCB board 11 by a patch, which firstly provides high connection strength and reliable fixation, and secondly provides a large cross-sectional area of ​​the connection, low resistance, and good conductivity. Some electronic components on the PCB board 11 are preferably concentrated within the low-voltage positive electrode cap 12. The electronic components are rationally arranged to fully utilize the internal space of the low-voltage positive electrode cap 12.

[0032] 7, the wound battery cell assembly 3 comprises a wound battery cell 33, an upper insulating sheet 34, and a lower insulating sheet 35, the positive electrode tab 31 passing through the center hole of the upper insulating sheet and having its end welded to the underside of the rivet connection part 9, and the negative electrode tab 32 wrapping around the side to the bottom of the wound battery cell 33 and having its end welded to the bottom wall of the second metal shell 5. In the present application, the wound battery cell assembly 33 is directly disposed within the second metal shell 5, which eliminates the need for an additional cover shell and reduces costs compared to the soft-pack or hard-shell lithium battery cells used in the prior art.

[0033] The specific connection principle of the circuit in this application is: the positive electrode tab 31 of the wound battery cell assembly 3 is connected to the PCB board 11 via the rivet connection part 9 and the high-voltage positive connection piece 13, and the negative electrode tab 32 of the wound battery cell assembly 3 is connected to the PCB board 11 via the second metal shell 5, the first metal shell 4 and the negative electrode metal dome 14. After the circuit voltage step-down process on the PCB board 11, the low-voltage positive electrode cap 12 outputs a 1.5V positive electrode voltage, and the second metal shell 5 outputs the negative electrode of the lithium battery.

[0034] The manufacturing method of the 1.5V lithium battery of this embodiment is as follows: S1: riveting the rivet connection part 9 into the fastening hole 41 in the bottom wall of the first metal shell 4 to seal the fastening hole 41; S2: fixing the circuit assembly 1 to the resin frame 2, and then inserting them into the first metal shell 4 together, so that the high-voltage positive connection piece 13 of the circuit assembly 1 is elastically contacted with the rivet connection part 9, and the negative metal dome 14 of the circuit assembly 1 is elastically contacted with the first metal shell 4, thereby achieving electrical connection; (S3) forming a spinning edge (44) on the upper end of the first metal shell (4) and pressing the resin frame (2) into the first metal shell (4); S4: fitting the first insulating seal 6 onto the first metal shell 4, inserting the wound battery cell assembly 3 into the second metal shell 5, and welding the positive electrode tab 31 of the wound battery cell assembly 3 to the bottom surface of the rivet connection part 9; S5: press-fitting 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 100 on the first metal shell 4 and the second metal shell 5; and S6 of attaching the positive and negative electrode insulating sheets 10 to the spinning edge 44, covering them with the insulating outer skin 7, performing heat shrinkage, and wrapping the insulating outer skin 7 in the first metal shell 4 and the second metal shell 5.

[0035] The manufacturing method of the present application has a rational process, a high yield, and is suitable for industrialization and mass production.

[0036] The PCB board 11 in the circuit assembly 1 of the present application is also equipped with necessary circuits such as a step-down circuit, a voltage stabilization circuit, a charging circuit, and an over-discharge protection circuit. The high-voltage positive connection piece 13 serves as the high-voltage positive input terminal and is electrically connected to the positive electrode tab 31 of the wound battery cell assembly 3 via the rivet connection part 9. The low-voltage positive electrode cap 12 serves as the battery positive electrode, and the second metal shell 5 serves as the battery negative electrode, allowing for a stable output of a low voltage of 1.5V.

[0037] In this application, a first metal shell 4 and a second metal shell 5 are provided, a circuit assembly 1 and a resin frame 2 are provided within the first metal shell 4, and a wound battery cell assembly 3 is provided within the second metal shell 5. The upper end of the wound battery cell assembly 3 is positioned shallowly within the second metal shell 5, resulting in a short positive electrode tab 31. Although the radial position cannot be controlled, the length is not long enough to contact the inner wall of the metal shells and prevent a short circuit. In addition, a horizontal seal 61 extends inward from the bottom of the first insulating seal 6. The horizontal seal 61 is attached to the underside of the first metal shell 4. This not only improves the sealing performance between the first insulating seal 6 and the first metal shell 4, but also covers the underside of the first metal shell 4, preventing contact between the positive electrode tab 31 and the underside of the first metal shell 4 and preventing a short circuit, thereby thoroughly eliminating the risk of a short circuit between the positive electrode tab 31 and the metal shell.

[0038] The first insulating seal 6 and the first metal shell 4 completely seal the upper end of the second metal shell 5, preventing the wound battery cell assembly 3 from moving up and down and preventing electrolyte leakage. The second insulating seal 8 seals the fastening hole 41, preventing electrolyte from entering the first metal shell 4 and also insulating the rivet connection part 9 from the first metal shell 4. The rivet connection part 9 acts as an intermediate conductor, outputting the high voltage of the wound battery cell assembly 3 to the circuit assembly. Example 2:

[0039] If the low-voltage lithium battery is an AAA battery, the width of the TYPE-C interface is small and the diameter of the AAA battery is small, making it difficult to arrange it horizontally, so it is changed to be arranged vertically, and the corresponding PCB board 11 is also changed to be arranged vertically. If the technical solution in the prior art is used, the position of the wound battery cell assembly 3 in the metal shell would be deeper, requiring a longer positive electrode tab 31, which would be more likely to short-circuit with the metal shell.

[0040] 13 to 15, this embodiment differs from Example 1 in that the low-voltage lithium battery is a AAA battery, the TYPE-C interface and PCB board 11 are both vertically arranged, and the low-voltage positive electrode cap 12 is placed on the resin frame 2 and not directly welded to the PCB board 11. Therefore, an elastic conductive part 16 is provided on the PCB board 11, and the elastic conductive part 16 contacts the inner wall of the low-voltage positive electrode cap 12 to achieve a low-voltage positive electrode output of 1.5V. The elastic conductive part 16 may be a metal dome or a spring.

[0041] In this embodiment, the positive and negative insulating sheets 10 are disposed below the spinning edge 44, which effectively prevents the positive and negative insulating sheets 10 from coming off. In the manufacturing method, the positive and negative insulating sheets 10 are first placed on the first metal shell 4 in step S2, and then the spinning edge 44 is fabricated. The other structures and beneficial effects are consistent with those of Example 1, and the technical solutions described in this application are more effective in this embodiment.

[0042] All of the above are preferred embodiments of the present application, and do not limit the protection scope of the present application, so that any equivalent modifications made based on the structure, shape and principle of the present application shall fall within the protection scope of the present application. [Explanation of symbols]

[0043] 1. Circuit assembly 11. PCB board 12. Low voltage positive cap 13. High voltage positive connection piece 14. Negative electrode metal dome 15. Charging interface 16. Elastic conductive parts 2. Resin frame 21. Upper frame 22, bottom frame 3. Wound battery cell assembly 31. Positive electrode tab 32, negative electrode tab 33. Wound battery cell 34. Upper insulation sheet 35. Lower insulation sheet 4. First metal shell 41, stopper hole 42, contraction section 43. First open hole 44. Spinning Edge 5. Second metal shell 6. First insulating seal 61, horizontal seal part 62. Annular bulge 7. Insulating outer jacket 71, the second hole 8. Second insulating seal 9. Rivet connection parts 91. Rivet 92. Metal sheet 10. Positive and negative electrode insulating sheet 100, full circumference welding

Claims

1. A 1.5V lithium battery, The battery pack comprises a circuit assembly (1), a resin frame (2), a wound battery cell assembly (3), a first metal shell (4), a second metal shell (5), a first insulating seal (6), and an insulating outer skin (7), wherein the circuit assembly (1) and the resin frame (2) are provided within the first metal shell (4), the resin frame (2) is for fixing the circuit assembly (1), the wound battery cell assembly (3) is provided within the second metal shell (5), and the first metal shell (4) and the second metal shell (5) are provided above The first insulating seal (6) is provided between the first metal shell (4) and the second metal shell (5) and serves to seal the second metal shell (5). A horizontal seal portion (61) extends inward from the bottom of the first insulating seal (6). The horizontal seal portion (61) is attached to the underside of the first metal shell (4) to cover the underside of the first metal shell (4). The insulating outer shell (7) is wrapped around the outside of the first metal shell (4) and the second metal shell (5). A fastening hole (41) is provided in the bottom wall of the first metal shell (4), and a second insulating seal (8) and a rivet connection part (9) are provided in the fastening hole (41), and the rivet connection part (9) rivets the second insulating seal (8) and the bottom wall of the first metal shell (4) to seal the fastening hole (41); The circuit assembly (1) comprises a PCB board (11), a low-voltage positive electrode cap (12), a high-voltage positive connection piece (13), and a negative electrode metal dome (14), the low-voltage positive electrode cap (12), the high-voltage positive connection piece (13), and the negative electrode metal dome (14) are all welded to the PCB board (11), the negative electrode metal dome (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 rivet connection part (9), the positive electrode tab (31) of the wound battery cell assembly (3) is welded to the lower end of the rivet connection part (9), and the negative electrode tab (32) is welded to the second metal shell (5). A 1.5V lithium battery.

2. A contracted portion (42) is provided at the lower end of the first metal shell (4), and a portion of the first insulating seal (6) is sandwiched between the contracted portion (42) and the second metal shell (5).

2. The 1.5 V lithium battery according to claim 1.

3. The outer annular surface of the first insulating seal (6) is provided with one or more annular bulges (62) to enhance the sealing between the first insulating seal (6) and the second metal shell (5).

3. The 1.5 V lithium battery according to claim 2.

4. The second insulating seal (8) is formed with a stop hole (41) by injection molding, and the rivet connection part (9) comprises a rivet (91) and a metal sheet (92), a rivet hole is provided in the center of the metal sheet (92), and the rivet (91) is riveted to the metal sheet (92), and the second insulating seal (8) and the bottom wall of the first metal shell (4) are pressed together to seal the stop hole (41).

2. The 1.5 V lithium battery according to claim 1.

5. The circuit assembly (1) further comprises a charging interface (15), which is welded to the PCB board (11), and the first metal shell (4) and the insulating outer cover (7) are provided at corresponding positions with a first opening (43) and a second opening (71), respectively.

2. The 1.5 V lithium battery according to claim 1.

6. The resin 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).

2. The 1.5 V lithium battery according to claim 1.

7. The first metal shell (4) has a spinning edge (44) at its upper end for pressing the resin frame (2) inward, and a positive and negative electrode insulating sheet (10) is further provided above or below the spinning edge (44), and a part of the upper surface of the positive and negative electrode insulating sheet (10) is covered with an insulating outer skin (7).

2. The 1.5 V lithium battery according to claim 1.

8. The low-voltage positive electrode cap (12) is welded to the PCB board (11) by a patch, and some electronic components on the PCB board (11) are laid out in the low-voltage positive electrode cap (12).

2. The 1.5 V lithium battery according to claim 1.

9. The wound battery cell assembly (3) comprises a wound battery cell (33), an upper insulating sheet (34) and a lower insulating sheet (35), the positive electrode tab (31) passes through the central hole of the upper insulating sheet (34) and has its end welded to the underside of the rivet connection part (9), and the negative electrode tab (32) is wrapped around the wound battery cell (33) from the side to the bottom and has its end welded to the bottom wall of the second metal shell (5).

2. The 1.5 V lithium battery according to claim 1.

10. A method for manufacturing the 1.5 V lithium battery according to any one of claims 1 to 9, comprising the steps of: S1: riveting the rivet connection part (9) into the fastening hole (41) in the bottom wall of the first metal shell (4) to seal the fastening hole (41); S2: fixing the circuit assembly (1) to the resin frame (2), and then inserting them together into the first metal shell (4), so that the high-voltage positive connection piece (13) of the circuit assembly (1) is elastically contacted with the rivet connection part (9), and the negative metal dome (14) of the circuit assembly (1) is elastically contacted with the first metal shell (4), thereby realizing electrical connection; (S3) forming a spinning edge (44) on the upper end of the first metal shell (4) and pressing the resin frame (2) into the first metal shell (4); S4: fitting a first insulating seal (6) onto the first metal shell (4), inserting the wound battery cell assembly (3) into the second metal shell (5), and welding the positive electrode tab (31) of the wound battery cell assembly (3) to the bottom surface of the rivet connection part (9); S5: press-fitting the first insulating seal (6) and the lower end of the first metal shell (4) into the second metal shell (5), and performing full-circumferential welding on the first metal shell (4) and the second metal shell (5); and S6 of covering the insulating outer shell (7), performing heat shrinkage, and encasing the insulating outer shell (7) in the first metal shell (4) and the second metal shell (5). A method for manufacturing a 1.5V lithium battery.

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