1.5 v lithium battery and manufacturing method therefor

Abstract

To provide a lithium battery of which the cost is suppressed, and a manufacturing method therefor.SOLUTION: The present invention relates to a 1.5 V lithium battery and a manufacturing method therefor. The 1.5 V lithium battery comprises a circuit assembly 1, a resin middle frame 2, a wound battery cell assembly 3, a metal shell 4, and an insulating sleeve 5. The circuit assembly, the resin middle frame and the wound battery cell assembly are sequentially arranged in the metal shell from top to bottom. A rolling groove is inwards formed in the upper part of the metal shell, and a spinning edge is inwards arranged at the top of the metal shell. The rolling groove limits the wound battery cell assembly at the bottom of the metal shell, the resin middle frame is limited between the rolling groove and the spinning edge, and sealing with the metal shell is achieved. The circuit assembly is arranged on the resin middle frame. According to the present application, the wound battery cell assembly is directly placed in the metal shell, which eliminates a layer of cover shell compared to the prior art using soft pack lithium battery cells or hard-case lithium battery cells, resulting in lower costs.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] A Chinese patent application with publication number CN203787480U and title "Variable Voltage Cylindrical Battery Device" discloses a low-voltage lithium battery that uses a voltage-drop 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 AA and AAA batteries. A Chinese patent application with publication number CN204966611U and title "1.5V Constant Voltage Lithium-Ion Battery" discloses a step-down circuit that can stably output a low voltage of 1.5V. All of the above prior art uses cylindrical battery cells, generally soft-pack battery cells or hard-shell battery cells, which require an additional metal shell on the outside, simplifying the assembly process but increasing costs. Summary of the Invention

[0003] The present invention provides a 1.5V lithium battery and a manufacturing method thereof to solve the technical problem of the high cost of conventional 1.5V lithium batteries.

[0004] In one aspect, the technical solution provided in this application is as follows: A 1.5V lithium battery includes a circuit assembly, a resin middle frame, a wound battery cell assembly, a metal shell, and an insulating outer cover, the insulating outer cover is wrapped around the metal shell, the circuit assembly, resin middle frame, and wound battery cell assembly are sequentially placed inside the metal shell from top to bottom, the metal shell has an inward rolling groove at its top and an inward spinning edge at its top, the rolling groove restricts the wound battery cell assembly to the bottom of the metal shell, the resin middle frame is restricted between the rolling groove and the spinning edge, and achieves a seal with the metal shell, and the circuit assembly is placed inside the resin middle frame.

[0005] The present application places the wound battery cell assembly directly into the metal shell, eliminating the need for a cover shell and reducing costs compared to the soft-pack or hard-shell lithium battery cells used in the prior art. The roll groove secures the wound battery cell assembly, and the roll groove and the upper spinning edge press together against the resin middle frame to seal, preventing electrolyte leakage.

[0006] Preferably, the space between the resin middle frame and the metal shell is sealed by an interference fit, or a seal ring is fitted onto the lower end of the resin middle frame, and the seal ring is pressed between the resin middle frame and the roll groove, thereby sealing the space between the resin middle frame and the metal shell.

[0007] Preferably, the wound battery cell assembly comprises a wound battery cell, a positive electrode tab, a negative electrode tab, an upper insulating sheet, and a lower insulating sheet, the positive electrode tab passing through a central hole in the upper insulating sheet and electrically connected to a circuit assembly, and the negative electrode tab wrapping from the side to the bottom of the wound battery cell and having an end welded to the bottom wall of the metal shell.

[0008] Preferably, the circuit assembly includes a PCB board, a low-voltage positive electrode cap, a negative electrode metal dome, and a high-voltage positive electrode cap. The PCB board has a low-voltage positive electrode copper ring and a negative electrode copper ring on its front side and a high-voltage positive electrode copper ring on its back side. The low-voltage positive electrode cap is welded to the positive electrode copper ring by a patch. The negative electrode metal dome has a base ring and a warped piece uniformly distributed around the base ring. The back side of the base ring is welded to the negative electrode copper ring by a patch. The warped piece is elastically pressed onto the spinning edge of the metal shell. The high-voltage positive electrode cap is welded to the high-voltage positive electrode copper ring by a patch and serves as a high-voltage positive electrode input terminal. The high-voltage positive electrode cap is connected to a positive electrode tab by welding. The low-voltage positive electrode cap serves as a low-voltage output positive electrode of the lithium battery, and the metal shell serves as a common negative electrode.

[0009] Preferably, a flange edge for supporting a PCB board is provided on the inner wall of the resin middle frame, a potting adhesive is provided between the high-voltage positive electrode cap and the resin middle frame to form a seal and isolate the electrolyte, electronic elements on the PCB board are concentrated within the low-voltage positive electrode cap and the high-voltage positive electrode cap, positive and negative electrode insulating sheets are further attached above the spinning edge, and a portion of the upper surface of the positive and negative electrode insulating sheets is also covered with an insulating outer skin.

[0010] Preferably, the circuit assembly includes a PCB board, a low-voltage positive cap, a charging interface, a negative metal dome, and a positive adapter plate, the low-voltage positive cap is welded to the upper surface of the PCB board by a patch, the charging interface and the positive adapter plate are provided on the lower surface of the PCB board, and a common negative pad is provided on the upper surface of the PCB board. The negative metal dome includes a substrate and a plurality of warped pieces provided on the outer edge of the substrate, the rear surface of the substrate is welded to the common negative pad by a patch, and the warped pieces are elastically pressed against the spinning edge of the metal shell. The positive tab of the wound battery cell assembly is welded and fixed to the positive adapter plate, and the negative tab is welded and fixed to the bottom end of the metal shell. The PCB board is snap-fitted into a resin middle frame. The PCB board is further provided with a charging indicator. Charging holes and light holes are provided at the same positions on the insulating outer cover and the metal shell, and the resin middle frame is made of a transparent material.

[0011] Preferably, a first through-hole is provided in the center of the bottom wall of the resin middle frame, the positive adapter plate passes through the first through-hole, is bent, and then spot-welded to the positive tab, a potting adhesive is provided in the first through-hole to form a seal and isolate the electrolyte, positive and negative electrode insulating sheets are further attached above the spinning edge, and outer portions of the positive and negative electrode insulating sheets are covered with an insulating outer skin, a PCB board insulating sheet is provided between the PCB board and the spinning edge to prevent a short circuit between the electronic components or solder joints on the PCB board and the spinning edge, a PCB board accommodating cavity is provided inside the resin middle frame, and a plurality of first fasteners are distributed on the inner wall of the upper end, the first fasteners restricting the PCB board within the accommodating cavity, and a thin-walled pressure relief hole is further provided in the bottom wall of the resin middle frame, and the thin-walled pressure relief hole is located below the charging interface.

[0012] Preferably, the circuit assembly includes a PCB board, a positive contact spring, a positive adapter plate, a negative metal dome, and a low-voltage positive cap; the resin middle frame includes an interlocking resin upper shell and a resin lower shell; the PCB board is vertically disposed between the resin upper shell and the resin lower shell; the positive contact spring is disposed at the upper end of the PCB board; the positive adapter plate is disposed at the lower end of the PCB board; the charging interface and the negative metal dome are disposed in the middle of the PCB board; and the low-voltage positive cap is disposed between the resin upper shell and the resin lower shell. the positive electrode contact spring passes upward through the resin upper shell and elastically contacts the inner wall of the low-voltage positive electrode cap, the negative electrode metal dome elastically contacts the inner wall of the metal shell, the positive electrode tab of the wound battery cell assembly is welded to the positive electrode adapter plate, positive and negative electrode insulating sheets are further provided between the spinning edge and the low-voltage positive electrode cap, a charging indicator is further provided on the PCB board, and charging holes and light holes are provided at the same positions on the insulating outer shell and the metal shell, and both the resin upper shell and the resin lower shell are made of a transparent material.

[0013] Preferably, a slot is provided on a side of the upper resin shell, a buttonhole is provided on a side wall of the slot, an insert piece is provided on the lower resin shell, and a second fastener is provided on the inside of the insert piece, and after the upper resin shell and the lower resin shell are butted together, the insert piece is inserted into the slot and the second fastener is embedded in the buttonhole, and a first escape hole and a second escape hole are further provided on a side wall of the upper resin shell to expose the charging interface and the negative electrode metal dome, respectively.

[0014] In another aspect, the present application provides a method for manufacturing a method of a medical device comprising: S1: placing the wound battery cell assembly in a metal shell, pressing the wound battery cell assembly against the bottom of the metal shell, and spot welding the negative tab to the bottom of the metal shell; S2: forming a roll groove on the upper part of the metal shell by a spinning method to restrict the wound battery cell assembly within the metal shell; injecting an electrolyte into the wound battery cell assembly (S3); S4, which places the circuit assembly in a resin middle frame; S5 welding the positive tab of the wound battery cell assembly to the circuit assembly; S6, which places the circuit assembly and the resin middle frame in the metal shell; S7: A spinning edge is created on the top of the metal shell by spinning, and the circuit assembly and the resin middle frame are confined inside the metal shell; S8: Sticking the positive and negative insulating sheets onto the top of the spinning edge; and S9 wrapping a layer of insulating outer skin around the metal shell.

[0015] In summary, the present application includes at least one of the following beneficial technical effects: 1. The present application directly places the wound battery cell assembly inside the metal shell, which is less costly. The metal shell is provided with rolling grooves and spinning edges to fix the wound battery cell assembly and the resin middle frame, and can be sealed by pressing, preventing electrolyte leakage. 2. This application provides the necessary circuits such as a voltage step-down circuit, a voltage stabilization circuit, a charging circuit, and an over-discharge protection circuit on the PCB board in the circuit assembly, and uses the low-voltage positive cap as the battery positive electrode and the metal shell as the battery negative electrode, so as to stably output low voltage; 3. This application provides a low-voltage positive cap and a high-voltage positive cap, and provides a positive copper ring, a negative copper ring and a high-voltage input copper ring on the PCB board, without using any conductive cables, and the electrical performance is highly stable. [Brief explanation of the drawings]

[0016] [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 an enlarged view of part B in FIG. [Figure 5] FIG. 5 is a front perspective view of the PCB board of the first embodiment of the present application. [Figure 6] FIG. 6 is a rear perspective view of the PCB board according to the first embodiment of the present application. [Figure 7] FIG. 7 is a perspective view of the wound battery cell assembly of Example 1 of the present application. [Figure 8] FIG. 8 is a schematic diagram of the assembly operation of the circuit assembly according to the first embodiment of the present application. [Figure 9] FIG. 9 is a schematic diagram of the assembly operation of the circuit assembly and the resin middle frame according to the first embodiment of the present application. [Figure 10]FIG. 10 is a front perspective view of the circuit assembly and the resin middle frame according to the first embodiment of the present application after assembly. [Figure 11] FIG. 11 is a rear perspective view of the circuit assembly and the resin middle frame according to the first embodiment of the present application after assembly. [Figure 12] FIG. 12 is a schematic view of Example 1 of the present application after dispensing between the circuit assembly and the resin middle frame. [Figure 13] FIG. 13 is a schematic diagram of an assembly operation in which the wound battery cell assembly of the first embodiment of the present application is placed in a metal shell. [Figure 14] FIG. 14 is an operational schematic diagram of the negative electrode tab welded to the metal shell in Example 1 of the present application. [Figure 15] FIG. 15 is a schematic diagram of the operation of forming roll grooves in the metal shell of Example 1 of the present application. [Figure 16] FIG. 16 is an operational schematic diagram of the positive electrode tab of Example 1 of the present application welded to the low-voltage positive electrode cap. [Figure 17] FIG. 17 is a schematic diagram showing the operation of the circuit assembly and the resin middle frame according to the first embodiment of the present application, which are arranged in a metal shell. [Figure 18] FIG. 18 is a schematic diagram of the operation of fabricating a spinning edge on a metal shell in Example 1 of the present application. [Figure 19] FIG. 19 is a schematic diagram showing the operation of the positive and negative electrode insulating sheet according to the first embodiment of the present application attached to the spinning edge. [Figure 20] FIG. 20 is a schematic diagram of the operation in which the metal shell according to the first embodiment of the present application is disposed on the insulating outer cover. [Figure 21] FIG. 21 is a schematic diagram of the state after the metal shell of Example 1 of the present application is placed on the insulating outer cover. [Figure 22] FIG. 22 is a schematic diagram of a state in which a metal shell is wrapped with an insulating outer cover in Example 1 of the present application. [Figure 23] FIG. 23 is a perspective view of the 1.5V lithium battery of Example 2 of the present application. [Figure 24] FIG. 24 is a schematic diagram of a half cross-sectional structure of the 1.5V lithium battery of Example 2 of the present application. [Figure 25] FIG. 25 is an enlarged view of part C in FIG. [Figure 26] FIG. 26 is a schematic exploded view of the 1.5V lithium battery of Example 2 of the present application. [Figure 27] FIG. 27 is a rear perspective view of the combination of the PCB board and the resin middle frame according to the second embodiment of the present application. [Figure 28] FIG. 28 is a front perspective view of an exploded structure of the PCB board and the resin middle frame according to the second embodiment of the present application. [Figure 29] FIG. 29 is a rear perspective view of the exploded structure of the PCB board and the resin middle frame according to the second embodiment of the present application. [Figure 30] FIG. 30 is a schematic exploded view of the PCB board according to the second embodiment of the present application. [Figure 31] FIG. 31 is a perspective view of the 1.5V lithium battery of Example 3 of the present application. [Figure 32] FIG. 32 is a schematic diagram of a half cross-sectional structure of the 1.5V lithium battery of Example 3 of the present application. [Figure 33] FIG. 33 is an enlarged view of part D in FIG. [Figure 34] FIG. 34 is a schematic half-sectional structural view of the 1.5V lithium battery of Example 3 of the present application at another angle. [Figure 35] FIG. 35 is an enlarged view of part E in FIG. [Figure 36] FIG. 36 is a schematic diagram of the exploded structure of the 1.5V lithium battery of Example 3 of the present application. [Figure 37] FIG. 37 is a schematic exploded view of the PCB board and the resin middle frame according to the third embodiment of the present application. DETAILED DESCRIPTION OF THE INVENTION

[0017] The present application will now be described in more detail with reference to Figures 1 to 37. Example 1:

[0018] 1 to 22, an embodiment of the present application discloses a 1.5V lithium battery including a circuit assembly 1, a resin middle frame 2, a wound battery cell assembly 3, a metal shell 4, and an insulating outer shell 5. The insulating outer shell 5 is coated on the outside of the metal shell 4, and the circuit assembly 1, resin middle frame 2, and wound battery cell assembly 3 are sequentially mounted inside the metal shell 4 from top to bottom. The metal shell 4 has an inward rolling groove 41 at its top and an inward spinning edge 42 at its top, which restricts the wound battery cell assembly 3 to the bottom of the metal shell 4. The resin middle frame 2 is restricted between the rolling groove 41 and the spinning edge 42, achieving a seal with the metal shell 4. The circuit assembly 1 is mounted inside the resin middle frame 2. In this embodiment, the resin middle frame 2 and the metal shell 4 are sealed by an interference fit.

[0019] 3, 4, and 7, the wound battery cell assembly 3 includes a wound battery cell 31, a positive electrode tab 32, a negative electrode tab 33, an upper insulating sheet 34, and a lower insulating sheet 35. The positive electrode tab 32 passes through a central hole in the upper insulating sheet 34 and is electrically connected to the circuit assembly 1. The negative electrode tab 33 wraps around the side and bottom of the wound battery cell 31, with its end welded to the bottom wall of the metal shell 4. The wound battery cell assembly 3 may be a commonly available ternary wound battery cell assembly or an iron phosphate wound battery cell assembly, or any other type of wound battery cell assembly. The wound battery cell assembly 3 has a voltage range of 3.0 to 4.2 V and outputs a constant voltage of 1.5 V through voltage step-down by the PCB board 11. The various functional circuits on the PCB board 11 are conventional and the present application does not substantially improve upon them, so no further description is provided here. The insulating outer cover 5 of the present application is preferably made of PVC material, which has the property of heat shrinkage and can be tightly wrapped around the metal shell 4 by blowing hot air onto it.

[0020] 5, 6, and 8, the circuit assembly 1 includes a PCB board 11, a low-voltage positive electrode cap 12, a negative electrode metal dome 13, and a high-voltage positive electrode cap 14. The PCB board 11 has a low-voltage positive electrode copper ring 111 and a negative electrode copper ring 112 on its front side and a high-voltage positive electrode copper ring 113 on its rear side. The low-voltage positive electrode cap 12 is welded to the positive electrode copper ring by a patch. The negative electrode metal dome 13 has a base ring 131 and cambered pieces 132 uniformly distributed around the base ring 131. The rear side of the base ring 131 is welded to the negative electrode copper ring 112 by a patch. The cambered pieces 132 are elastically pressed against the spinning edge 42 of the metal shell 4. The high-voltage positive electrode cap 14 is welded to the high-voltage positive electrode copper ring 113 by a patch and serves as a high-voltage positive electrode input terminal. The high-voltage positive electrode cap 14 is connected to the positive electrode tab 32 by welding, the low-voltage positive electrode cap 12 is used as the low-voltage output positive electrode of the lithium battery, and the metal shell 4 is used as the common negative electrode.

[0021] The PCB board 11 in the circuit assembly 1 of this embodiment 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. The PCB board 11 is characterized by a low-voltage positive copper ring 111 and a negative copper ring 112 on its front side and a high-voltage positive copper ring 113 on its back side. The low-voltage positive copper ring 111 serves as the low-voltage output positive electrode, the high-voltage positive copper ring 113 serves as the high-voltage input positive electrode, and the negative copper ring 112 serves as the common negative electrode. These three copper rings are electrically connected to external conductive components to achieve high-voltage input and low-voltage output functions, stably output a low voltage of 1.5V, and provide single-port charging and discharging. This eliminates the need for wiring conductive cables, resulting in more stable electrical performance, a simplified internal connection structure for lithium batteries, and greater safety and reduced risk of malfunction.

[0022] The warped piece 132 is elastically pressed against the spinning edge 42 of the metal shell 4, and the elastic pressing can prevent the metal shell 4 from being pressed tightly against the negative copper ring 112 on the PCB board 11, or from being crushed.

[0023] Referring to Figure 3, the inner wall of the resin middle frame 2 is provided with a flange edge 21 for supporting the PCB board 11. A potting adhesive 7 is further provided between the high-voltage positive electrode cap 14 and the resin middle frame 2, forming a seal to isolate the electrolyte. Electronic components 114 on the PCB board 11 are concentrated within the low-voltage positive electrode cap 12 and the high-voltage positive electrode cap 14. Positive and negative electrode insulating sheets 8 are further attached above the spinning edge 42, and a portion of the upper surface of the positive and negative electrode insulating sheets 8 is also covered with an insulating outer skin 5.

[0024] The potting adhesive 7 fills the gap between the high-voltage positive electrode cap 14 and the resin middle frame 2, providing a good sealing effect and isolating the electrolyte, preventing contact between the electrolyte and the PCB board 11 and corrosion, which could lead to premature failure of the PCB board 11. By controlling the thickness and cross-sectional shape of the potting adhesive 7, the potting adhesive 7 is endowed with a certain strength. When an internal fault occurs within the wound battery cell assembly 3, the temperature and air pressure increase until they reach a certain threshold, and the potting adhesive 7 breaks through to release the pressure, preventing an overvoltage explosion of the lithium battery.

[0025] The low-voltage positive cap 12 and the high-voltage positive cap 14 are both welded to the PCB board 11 by patches, which firstly provide high connection strength and reliable fixation, and secondly provide large cross-sectional areas, low resistance, and good conductivity at the connection points. The electronic components 114 on the PCB board 11 are preferably concentrated within the low-voltage positive cap 12 and the high-voltage positive cap 14. Firstly, the layout of the electronic components 114 is rational and makes full use of the internal space of the low-voltage positive cap 12 and the high-voltage positive cap 14. Secondly, the low-voltage positive cap 12 and the high-voltage positive cap 14 are strong and can provide protection, preventing the electronic components 114 from contacting and being damaged by the outside world. Thirdly, a sealing effect is provided, preventing the intrusion of water and dust, thereby extending the service life of the PCB board 11. In this application, the electronic components 114 in the high-voltage positive cap 14 are three-in-one step-down chips, which belong to the prior art and have the advantages of high integration and small size, making the design of the PCB board 11 simpler. The electronic components 114 in the low-voltage positive cap 12 are components such as inductors, capacitors, and resistors. Furthermore, the low-voltage positive cap 12 is exposed and may be in contact with the outside, making it susceptible to impacts, and therefore requires a stronger connection method. Therefore, the low-voltage positive cap 12 is provided with a flange edge 21. The flange edge 21 has a certain width and is several times the thickness of the low-voltage positive cap 12, thereby providing a large contact area with the low-voltage positive copper ring 111, ensuring a firm connection and shock resistance. Because the high-voltage positive cap 14 is not exposed, is not subject to external impacts, and has relatively low strength requirements, the flange edge 21 may be omitted.

[0026] The positive and negative electrode insulating sheets 8 prevent impurities such as dust from entering between the negative electrode metal dome 13 and the low-voltage positive electrode cap 12, thereby preventing a short circuit between them. Part of the upper surface of the positive and negative electrode insulating sheets 8 is also covered by the insulating outer skin 5, which further stabilizes the positive and negative electrode insulating sheets 8.

[0027] Specific circuit connection principle: the positive electrode tab 32 of the wound battery cell assembly 3 is connected to the PCB board 11 via the high-voltage positive electrode cap 14 and the high-voltage positive electrode copper ring 113, and the negative electrode tab 33 of the wound battery cell assembly 3 is connected to the PCB board 11 via the metal shell 4, the negative electrode metal dome 13 and the negative electrode copper ring 112. After the circuit step-down process on the PCB board 11, the positive electrode of the lithium battery is output from the low-voltage positive electrode copper ring 111 and the low-voltage positive electrode cap 12, and the negative electrode of the lithium battery is output from the negative electrode copper ring 112, the negative electrode metal dome 13 and the metal shell 4.

[0028] In this application, the wound battery cell assembly 3 is placed directly inside the metal shell 4, eliminating the need for a cover shell and reducing costs compared to the soft-pack or hard-shell lithium battery cells used in the prior art. The roll groove 41 secures the wound battery cell assembly 3, and the roll groove 41, together with the spinning edge 42 at the upper end, presses against the resin middle frame 2 to seal it, preventing electrolyte leakage and achieving a sealed, integrated press.

[0029] The manufacturing method of the 1.5V lithium battery of this embodiment is as follows: Referring to FIG. 8, first, a PCB board 11 is provided, and a patch of a low-voltage positive electrode cap 12 and a negative electrode metal dome 13 is welded to the front side of the PCB board 11, and a patch of a high-voltage positive electrode cap 14 is welded to the back side of the PCB board 11 to form a circuit assembly 1; 13 and 14, the steps include placing the wound battery cell assembly 3 in the metal shell 4, pressing the wound battery cell assembly 3 against the bottom of the metal shell 4, and spot welding the negative electrode tab 33 to the metal shell 4 (S1); Referring to FIG. 15, a roll groove 41 is formed in the upper part of the metal shell 4 by spinning to restrict the wound battery cell assembly 3 within the metal shell 4 (S2); Injecting an electrolyte into the wound battery cell assembly (3) (S3); S4: placing the circuit assembly 1 in the resin middle frame 2, and applying a potting adhesive 7 to the rear surface of the resin middle frame 2 to form a sealed structure between the resin middle frame 2 and the high-voltage positive electrode cap 14; Referring to FIG. 16, the positive electrode tab 32 of the wound battery cell assembly 3 is welded to the underside of the high voltage positive electrode cap 14 of the circuit assembly 1 (S5); Referring to FIG. 17, S6 is a process of placing the circuit assembly 1 and the resin middle frame 2 in the metal shell 4; Referring to FIG. 18, a spinning edge 42 is formed on the upper end of the metal shell 4 by spinning, and the circuit assembly 1 and the resin middle frame 2 are confined inside the metal shell 4 (S7); Referring to FIG. 19, the positive and negative electrode insulating sheets 8 are attached to the upper side of the spinning edge 42 (S8); 20 to 22, a layer of insulating outer covering 5 is wrapped around the outside of the metal shell 4.

[0030] The manufacturing method of the present application has a rational process, a high yield, and is suitable for industrialization and mass production. Example 2:

[0031] The main difference from the first embodiment is that a charging interface 15 is added, and charging is performed directly through the charging interface 15. The charging interface 15 may be a common interface such as miniUSB or TYPE-C in the prior art.

[0032] 23 to 30 , the circuit assembly 1 includes a PCB board 11, a low-voltage positive electrode cap 12, a charging interface 15, a negative electrode metal dome 13, and a positive electrode adapter plate 16. The low-voltage positive electrode cap 12 is welded to the upper surface of the PCB board 11 by a patch, and the charging interface 15 and the positive electrode adapter plate 16 are provided on the lower surface of the PCB board 11. A common negative pad 115 is provided on the upper surface of the PCB board 11. The negative electrode metal dome 13 includes a substrate 133 and a plurality of warped pieces 132 provided on the outer edge of the substrate 133. The back surface of the substrate 133 is welded to the common negative pad 115 by a patch, and the warped pieces 132 are elastically pressed against the spinning edge 42 of the metal shell 4. The positive electrode tab 32 of the wound battery cell assembly 3 is welded and fixed to the positive electrode adapter plate 16, and the negative electrode tab 33 is welded and fixed to the bottom end of the metal shell 4. The PCB board 11 is snap-fitted into the resin middle frame 2, and a charging indicator 17 that functions as an indicator during charging is further provided on the PCB board 11. Charging holes 51, 43 and light holes 52, 44 are provided at the same positions on the insulating outer cover 5 and the metal shell 4, and the resin middle frame 2 is made of a transparent material.

[0033] The warped piece 132 elastically abuts against the spinning edge 42 of the metal shell 4, which can prevent the metal shell 4 and the negative metal dome 13 from being pressed tightly together or from shattering the PCB board 11.

[0034] 25 , a first through-hole 22 is provided in the center of the bottom wall of the resin middle frame 2, and the positive adapter plate 16 passes through the first through-hole 22 and is bent and then spot-welded to the positive tab 32. A potting adhesive 7 is provided in the first through-hole 22 to form a seal and isolate the electrolyte. A positive and negative electrode insulating sheet 8 is further attached above the spinning edge 42, and the outer portions of the positive and negative electrode insulating sheet 8 are covered with an insulating outer skin 5. A PCB board insulating sheet 9 is provided between the PCB board 11 and the spinning edge 42 to prevent a short circuit between the electronic components 114 or solder joints on the PCB board 11 and the spinning edge 42. The resin middle frame 2 has a cavity 23 for accommodating the PCB board 11, and a plurality of first fasteners 24 are distributed along the inner wall at the upper end of the frame. The first fasteners 24 restrict the PCB board 11 within the cavity 23. Because the first fasteners 24 have a certain degree of elastic deformation ability, the PCB board 11 can be simply pressed into the cavity 23 without the first fasteners 24 preventing the PCB board 11 from coming out. The resin middle frame 2 also has the effect of isolating the PCB board 11 from the metal shell 4. The bottom wall of the resin middle frame 2 is further provided with a thin-walled pressure relief hole 25, which is located below the charging interface 15. If a malfunction occurs inside the wound battery cell assembly 3 and the temperature and air pressure rise suddenly, the thin wall can be broken through to release the pressure, reducing the risk of lithium battery explosion. The thin-walled pressure relief hole 25 is located very close to the charging ports 51 and 43, so the pressure relief path is short.

[0035] 30, the low-voltage positive cap 12 is welded to the PCB board 11 by a patch, ensuring both secure fixation and electrical connection. Some electronic components 114 on the PCB board 11 are placed inside the low-voltage positive cap 12, making full use of the internal space of the low-voltage positive cap 12. The low-voltage positive cap 12 protects the internal electronic components 114 and provides a good sealing effect to prevent the intrusion of water and dust.

[0036] In this embodiment, the PCB board 11 is snap-fit into the resin middle frame 2, so that the PCB board 11 cannot easily come out of the resin middle frame 2, and serves to fix and protect the PCB board 11. This prevents the PCB board 11 from being pressed when the spinning edge 42 is processed, and also isolates it from the metal shell 4, preventing short circuits.

[0037] The other structures and beneficial effects are all consistent with Example 1 and will not be described here again. Example 3:

[0038] The difference from the second embodiment is that the layout of the circuit assembly 1, especially the charging interface 15, is significantly changed.

[0039] 31 to 37, the circuit assembly 1 includes a PCB board 11, a positive contact spring 18, a positive adapter plate 16, a negative metal dome 13, and a low-voltage positive cap 12. The resin middle frame 2 includes an interlocking resin upper shell 26 and a resin lower shell 27. The PCB board 11 is vertically disposed between the resin upper shell 26 and the resin lower shell 27, and the resin middle frame 2 serves to isolate the PCB board 11 from the metal shell 4. The positive contact spring 18 is disposed at the upper end of the PCB board 11, the positive adapter plate 16 is disposed at the lower end of the PCB board 11, and the charging interface 15 and the negative metal dome 13 are disposed at the center of the PCB board 11. The low-voltage positive cap 12 is disposed in the resin upper shell 26, and the positive contact spring 18 passes upward through the resin upper shell 26 and elastically contacts the inner wall of the low-voltage positive cap 12. The negative metal dome 13 elastically contacts the inner wall of the metal shell 4. The positive tab 32 of the wound battery cell assembly 3 is welded to the positive adapter plate 16. The positive and negative insulating sheets 8 are provided between the spinning edge 42 and the low-voltage positive cap 12, and mainly prevent short-circuiting between the metal shell 4 and the low-voltage positive cap 12. The PCB board 11 is further provided with a charging indicator 17 that functions as an indicator during charging. Charging holes 51 and 43 and light holes 52 and 44 are provided at the same positions on the insulating outer shell 5 and metal shell 4, and the resin upper shell 26 and resin lower shell 27 are both made of a transparent material.

[0040] 37, a slot 261 is formed on a side surface of the resin upper shell 26, a buttonhole 262 is formed on a side wall of the slot 261, an insert piece 271 is formed on the resin lower shell 27, and a second fastener 272 is formed inside the insert piece 271. After the resin upper shell 26 and the resin lower shell 27 are butted together, the insert piece 271 is inserted into the slot 261 and the second fastener 272 is embedded in the buttonhole 262, thereby engaging and fixing the resin upper shell 26 and the resin lower shell 27 together. A first relief hole 263 and a second relief hole 264 are further formed on a side wall of the resin upper shell 26 to expose the charging interface 15 and the negative electrode metal dome 13, respectively.

[0041] 35, a seal ring 6 is fitted onto the lower end of the resin middle frame 2, and the seal ring 6 is pressed between the resin middle frame 2 and the roll groove 41, thereby realizing a seal between the resin middle frame 2 and the metal shell 4. During the process of forming the spinning edge 42, the resin middle frame 2 is pressed downward, and the seal ring 6 is pressed and deformed, thereby achieving a high degree of sealing and effectively preventing electrolyte leakage.

[0042] 35, a second through-hole 273 is provided in the center of the bottom wall of the resin lower shell 27, and the positive electrode adapter plate 16 passes through the second through-hole 273 downward, is bent, and then is connected to the positive electrode tab 32 by spot welding. The second through-hole 273 is provided with a potting adhesive 7 to form a seal and isolate the electrolyte, allowing the electrolyte to permeate through the second through-hole 273 and contact the PCB board 11, while also controlling the thickness of the potting adhesive 7 and may also serve as a pressure relief hole.

[0043] In this embodiment, the resin middle frame 2 is provided such that the PCB board 11 is vertically arranged within the resin middle frame 2, and the charging interface 15 on the PCB board 11 is also vertically laid out. In this way, the charging interface 15 can be easily arranged within the metal shell 4. In particular, when the lithium battery has the outer shape of an AAA battery and is small in size, the resin middle frame 2 can protect the PCB board 11 and prevent it from being pressed when the spinning edge 42 is processed, and can also be isolated from the metal shell 4, preventing short-circuiting.

[0044] The other structures and beneficial effects are all consistent with Example 2 and will not be described here again.

[0045] 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]

[0046] 1. Circuit assembly 11. PCB board 111. Low voltage positive copper ring 112, negative electrode copper ring 113. High voltage positive electrode copper ring 114, electronic elements 115, common negative pad 12. Low voltage positive cap 13. Negative electrode metal dome 131. Base Ring 132. Curved piece 133, PCB 14. High voltage positive electrode cap 15. Charging interface 16. Positive adapter plate 17. Charging indicator 18. Positive contact spring 2. Resin middle frame 21. Flange edge 22, first through hole 23. Storage cavity 24. First fastener 25. Thin-walled pressure relief hole 26. Resin upper shell 261, Slots 262, Buttonhole 263, First escape hole 264, second escape hole 27. Resin lower shell 271, insert piece 272, second fastener 273, second through hole 3. Wound battery cell assembly 31. Wound battery cell 32, positive electrode tab 33. Negative electrode tab 34. Upper insulation sheet 35. Lower insulation sheet 4. Metal shell 41. Roll groove 42. Spinning Edge 43, charging hole 44. Light Hall 5. Insulating outer jacket 51, charging hole 52. Light Hall 6. Seal ring 7. Potting adhesive 8. Positive and negative electrode insulating sheet 9. PCB board insulation sheet

Claims

1. A 1.5V lithium battery, The battery pack comprises a circuit assembly, a resin middle frame, a wound battery cell assembly, a metal shell, and an insulating outer skin, the insulating outer skin covering the outside of the metal shell, the circuit assembly, resin middle frame, and wound battery cell assembly being arranged in this order from top to bottom within the metal shell, the metal shell having an inward rolling groove at the top and an inward spinning edge at the top, the rolling groove restricting the wound battery cell assembly to the bottom of the metal shell, the resin middle frame being restricted between the rolling groove and the spinning edge, realizing a seal between the metal shell, and the circuit assembly being arranged within the resin middle frame. A 1.5V lithium battery.

2. The resin middle frame and the metal shell are tightly sealed by an interference fit.

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

3. A seal ring is fitted onto the lower end of the resin middle frame, and the seal ring is pressed between the resin middle frame and the roll groove, thereby realizing a tight seal between the resin middle frame and the metal shell.

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

4. The wound battery cell assembly includes a wound battery cell, a positive electrode tab, a negative electrode tab, an upper insulating sheet, and a lower insulating sheet. The positive electrode tab passes through a central hole in the upper insulating sheet and is electrically connected to a circuit assembly. The negative electrode tab is wound from the side to the bottom of the wound battery cell, and its end is welded to the bottom wall of the metal shell.

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

5. The circuit assembly includes a PCB board, a low-voltage positive electrode cap, a negative electrode metal dome, and a high-voltage positive electrode cap. The PCB board has a low-voltage positive electrode copper ring and a negative electrode copper ring on the front side and a high-voltage positive electrode copper ring on the back side. The low-voltage positive electrode cap is welded to the positive electrode copper ring by a patch. The negative electrode metal dome has a lower surface welded to the negative electrode copper ring and an upper surface crimped to the spinning edge of the metal shell. The high-voltage positive electrode cap is welded to the high-voltage positive electrode copper ring by a patch and serves as a high-voltage positive electrode input terminal. The high-voltage positive electrode cap is connected to a positive electrode tab by welding. The low-voltage positive electrode cap serves as a low-voltage output positive electrode of the lithium battery, and the metal shell serves as a common negative electrode.

5. The 1.5 V lithium battery according to claim 4.

6. The circuit assembly includes a PCB board, a low-voltage positive cap, a charging interface, a negative metal dome, and a positive adapter plate. The low-voltage positive cap is welded to the upper surface of the PCB board by a patch. The charging interface and the positive adapter plate are provided on the lower surface of the PCB board. A common negative pad is provided on the upper surface of the PCB board. The negative metal dome includes a substrate and a plurality of warped pieces provided on the outer edge of the substrate. The rear surface of the substrate is welded to the common negative pad by a patch. The warped pieces are elastically pressed against the spinning edge of the metal shell. The positive tab of the wound battery cell assembly is welded and fixed to the positive adapter plate, and the negative tab is welded and fixed to the bottom end of the metal shell. The PCB board is snap-fitted into a resin middle frame. The PCB board is further provided with a charging indicator. A charging hole and a light hole are provided at the same positions on the insulating outer cover and the metal shell. The resin middle frame is made of a transparent material.

5. The 1.5 V lithium battery according to claim 4.

7. The circuit assembly includes a PCB board, a positive contact spring, a positive adapter plate, a negative metal dome, and a low-voltage positive cap. The resin middle frame includes an upper resin shell and a lower resin shell that are interlocked with each other. The PCB board is vertically disposed between the upper resin shell and the lower resin shell. The positive contact spring is disposed on the upper end of the PCB board, the positive adapter plate is disposed on the lower end of the PCB board, the charging interface and the negative metal dome are disposed in the middle of the PCB board, and the low-voltage positive cap is disposed on the upper resin shell. The positive electrode contact spring passes upward through the resin upper shell and elastically contacts the inner wall of the low-voltage positive electrode cap, the negative electrode metal dome elastically contacts the inner wall of the metal shell, the positive electrode tab of the wound battery cell assembly is welded to the positive electrode adapter plate, positive and negative electrode insulating sheets are further provided between the spinning edge and the low-voltage positive electrode cap, a charging indicator is further provided on the PCB board, a charging hole and a light hole are provided at the same positions on the insulating outer shell and the metal shell, and both the resin upper shell and the resin lower shell are made of a transparent material.

5. The 1.5 V lithium battery according to claim 4.

8. A method for producing the 1.5 V lithium battery according to any one of claims 1 to 7, comprising the steps of: S1: placing the wound battery cell assembly in a metal shell, pressing the wound battery cell assembly against the bottom of the metal shell, and spot welding the negative electrode tab to the bottom of the metal shell; S2: forming a roll groove on the top of the metal shell by spinning to restrict the wound battery cell assembly within the metal shell; injecting an electrolyte into the wound battery cell assembly (S3); S4: placing the circuit assembly in the resin middle frame; S5 welding the positive electrode tab of the wound battery cell assembly to the circuit assembly; S6: placing the circuit assembly and the resin middle frame in the metal shell; (S7) forming a spinning edge on the upper end of the metal shell by spinning, and regulating the circuit assembly and the resin middle frame inside the metal shell; S8: attaching a positive and negative electrode insulating sheet to the upper side of the spinning edge; and S9, which encases a layer of insulating outer skin on the outside of the metal shell. A method for manufacturing a 1.5V lithium battery.

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