1.5 v lithium battery and manufacturing method therefor

Abstract

The present application relates to a 1.5 V lithium battery and a manufacturing method therefor. The 1.5 V lithium battery comprises a circuit assembly, a plastic middle frame, a wound battery cell assembly, a metal case, and an insulating sleeve; the circuit assembly, the plastic middle frame and the wound battery cell assembly are sequentially arranged in the metal case from top to bottom; a groove is inwards formed in the upper part of the metal case, and a spun edge is inwards arranged at the top of the metal case; the groove limits the wound battery cell assembly at the bottom of the metal case; the plastic middle frame is limited between the groove and the spun edge, and sealing between the plastic middle frame and the metal case is achieved; and the circuit assembly is arranged on the plastic middle frame. According to the present application, the wound battery cell assembly is directly placed in the metal case, which eliminates a layer of outer wrapping compared to the prior art using pouch lithium battery cells or hard-case lithium battery cells, resulting in lower costs; by providing the groove, the wound battery cell assembly is fixed; and the groove and the spun edge at the upper end jointly press and seal the plastic middle frame, without leaking an electrolyte.

Description

A 1.5V lithium battery and its manufacturing method Technical Field

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

[0002] In the Chinese patent application with publication number CN203787480U and titled “A cylindrical battery device with variable voltage”, a low-voltage lithium battery is disclosed. The high voltage (3.0-4.2V) of the lithium battery is converted to a low voltage of 1.5V through a voltage drop circuit board, thereby replacing the common No. 5 and No. 7 batteries. In the Chinese patent application with publication number CN204966611U and titled “A 1.5V constant voltage lithium-ion battery”, a step-down circuit is disclosed that can constantly output a low voltage of 1.5V. The above existing technologies all use cylindrical battery cells, which can generally be soft-pack battery cells or hard-shell battery cells, with a metal shell on the outside. Although the assembly process is simple, the cost is high.

[0003] Summary of the Invention

[0004] In order to solve the technical problem of high cost of existing 1.5V lithium batteries, the present invention provides a 1.5V lithium battery and a manufacturing method thereof.

[0005] On the one hand, the technical solution provided by the present application is as follows: a 1.5V lithium battery, comprising a circuit assembly, a plastic middle frame, a wound cell assembly, a metal shell and an insulating outer skin, wherein the insulating outer skin is covered on the outside of the metal shell, and the circuit assembly, plastic middle frame and wound cell assembly are arranged in the metal shell in sequence from top to bottom; a rolling groove is provided inwardly on the upper part of the metal shell, and a spinning edge is provided inwardly on the top, and the rolling groove confines the wound cell assembly to the bottom of the metal shell, and the plastic middle frame is confined between the rolling groove and the spinning edge, and realizes sealing with the metal shell, and the circuit assembly is arranged on the plastic middle frame.

[0006] This application directly places the wound cell assembly into the metal casing, eliminating the need for a casing compared to existing soft-pack or hard-shell lithium cells, resulting in lower costs. Rolling grooves secure the wound cell assembly, and the grooves and the spun edge at the top together compress and seal the plastic midframe, preventing electrolyte leakage.

[0007] Preferably, the plastic middle frame and the metal shell are sealed by a tight fit; or a sealing ring is provided on the lower end of the plastic middle frame, and the sealing ring is pressed between the plastic middle frame and the rolling groove, thereby achieving sealing between the plastic middle frame and the metal shell.

[0008] Preferably, the wound battery cell assembly includes a wound battery cell, a positive electrode tab, a negative electrode tab, an upper separator and a lower separator. The positive electrode tab passes through the center hole of the upper separator and is electrically connected to the circuit assembly. The negative electrode tab is wound from the side of the wound battery cell to the bottom surface, and the end is welded to the bottom wall of the metal shell.

[0009] Preferably, the circuit assembly includes a PCB board, a low-voltage positive electrode cap, a negative electrode spring and a high-voltage positive electrode cap. The front of the PCB board is provided with a low-voltage positive electrode copper ring and a negative electrode copper ring, and the back is provided with a high-voltage positive electrode copper ring. The low-voltage positive electrode cap is welded on the positive electrode copper ring through a patch. The negative electrode spring includes a base ring and lift pieces evenly distributed around the base ring. The back of the base ring is welded on the negative electrode copper ring through a patch, and the lift pieces are elastically crimped with the spun edge of the metal shell; the high-voltage positive electrode cap is welded on the high-voltage positive electrode copper ring through a patch and serves as the high-voltage positive electrode input terminal. The high-voltage positive electrode cap is connected to the positive electrode ear by welding. The low-voltage positive electrode cap serves as the low-voltage output positive electrode of the lithium battery, and the metal shell serves as the common negative electrode.

[0010] Preferably, the inner wall of the plastic middle frame is provided with a flange edge for supporting the PCB board, and a potting compound is also provided between the high-voltage positive electrode cap and the plastic middle frame to form a seal to isolate the electrolyte; the electronic components on the PCB board are centrally arranged in the low-voltage positive electrode cap and the high-voltage positive electrode cap; positive and negative electrode separators are also pasted above the spun edge, and the upper surface of the positive and negative electrode separators is also wrapped by an insulating outer skin.

[0011] Preferably, the circuit assembly includes a PCB board, a low-voltage positive electrode cap, a charging interface, a negative electrode spring and a positive electrode adapter. The low-voltage positive electrode cap is welded on the upper surface of the PCB board through a patch, the charging interface and the positive electrode adapter are arranged on the lower surface of the PCB board, and a common negative electrode pad is provided on the upper surface of the PCB board. The negative electrode spring includes a substrate and a plurality of lift-off tabs arranged on the outer edge of the substrate. The back side of the substrate is welded on the common negative electrode pad through a patch, and the lift-off tab is elastically crimped with the spun edge of the metal shell. The positive electrode tab of the wound battery cell assembly is welded and fixed to the positive electrode adapter, and the negative electrode tab is welded and fixed to the bottom end of the metal shell. The PCB board is clamped in the plastic middle frame. A charging indicator light is also provided on the PCB board. A charging hole and a light-transmitting hole are provided at the same position of the insulating skin and the metal shell, and the plastic middle frame is made of transparent material.

[0012] Preferably, a first through hole is provided in the middle of the bottom wall of the plastic middle frame, the positive electrode adapter plate passes downward through the first through hole, is bent and connected to the positive electrode ear by spot welding, and a potting compound is provided at the first through hole to form a seal to isolate the electrolyte; positive and negative electrode separators are also pasted above the spun edge, and the outer parts of the positive and negative electrode separators are wrapped by an insulating outer skin, and a PCB board separator is also provided between the PCB board and the spun edge to prevent short circuit between the electronic components or solder joints on the PCB board and the spun edge; a PCB board accommodating cavity is provided inside the plastic middle frame, and a plurality of first clips are dispersed on the inner wall of the upper end, and the first clips confine the PCB board in the accommodating cavity; a thin-walled pressure relief hole is also provided on the bottom wall of the plastic middle frame, and the thin-walled pressure relief hole is located below the charging interface.

[0013] Preferably, the circuit assembly includes a PCB board, a positive contact spring, a positive adapter plate, a negative spring plate and a low-voltage positive cap, the plastic middle frame includes a plastic upper shell and a plastic lower shell that are buckled into each other, the PCB board is vertically arranged between the plastic upper shell and the plastic lower shell, the positive contact spring is arranged at the upper end of the PCB board, the positive adapter plate is arranged at the lower end of the PCB board, the charging interface and the negative spring plate are arranged in the middle of the PCB board, the low-voltage positive cap is arranged on the plastic upper shell, the positive contact spring passes through the plastic upper shell upward and elastically contacts the inner wall of the low-voltage positive cap, the negative spring plate elastically contacts the inner wall of the metal shell, the positive pole ear of the wound battery cell assembly is welded to the positive adapter plate, a positive and negative separator is further provided between the spinning edge and the low-voltage positive cap, a charging indicator light is also provided on the PCB board, a charging hole and a light-transmitting hole are provided at the same position of the insulating outer skin and the metal shell, and the plastic upper shell and the plastic lower shell are both made of transparent material.

[0014] Preferably, a slot is provided on the side of the plastic upper shell, a buckle hole is provided on the side wall of the slot, an insert is provided on the plastic lower shell, a second buckle is provided on the inner side of the insert, and after the plastic upper shell and the plastic lower shell are docked, the insert is inserted into the slot and the second buckle is embedded in the buckle hole; the side wall of the plastic upper shell is also provided with a first avoidance hole and a second avoidance hole, which are used to expose the charging port and the negative electrode spring respectively.

[0015] On the other hand, the present application provides a method for manufacturing the above-mentioned 1.5V lithium battery, comprising the following steps:

[0016] S1, placing the wound battery cell assembly into a metal casing, pressing the wound battery cell assembly against the bottom of the metal casing, and spot welding the bottom of the metal casing to weld the negative electrode tab to the metal casing;

[0017] S2, making a rolling groove on the upper part of the metal shell by spinning; confining the wound battery cell assembly in the metal shell;

[0018] S3, adding electrolyte into the wound battery cell assembly;

[0019] S4, placing the circuit components into the plastic middle frame;

[0020] S5, welding the positive electrode tab of the wound battery cell assembly to the circuit assembly;

[0021] S6, place the circuit components and plastic middle frame into the metal housing;

[0022] S7, using a spinning method to produce a spinning edge on the upper end of the metal shell, confining the circuit components and the plastic middle frame inside the metal shell;

[0023] S8, pasting the positive and negative electrode separators on the top of the spinning edge;

[0024] S9, an insulating outer layer is wrapped around the metal shell.

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

[0026] 1. This application directly places the wound cell assembly into the metal casing, which is more cost-effective. Rolling grooves and spun edges are provided on the metal casing to secure the wound cell assembly and the plastic midframe, achieving a tight seal and preventing electrolyte leakage.

[0027] 2. The PCB board in the circuit assembly of this 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 low-voltage positive electrode cap serves as the positive electrode of the battery, and the metal casing serves as the negative electrode of the battery, which can stably output low voltage.

[0028] 3. This application sets a low-voltage positive cap and a high-voltage positive cap, and sets a positive copper ring, a negative copper ring and a high-voltage input copper ring on the PCB board. No conductive cables are used, and the electrical performance is more stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] FIG1 is a perspective view of a 1.5V lithium battery according to Example 1 of the present application;

[0030] FIG2 is a schematic diagram of a half-section structure of a 1.5V lithium battery according to Example 1 of the present application;

[0031] Figure 3 is an enlarged view of point A in Figure 2;

[0032] Figure 4 is an enlarged view of point B in Figure 2;

[0033] FIG5 is a front perspective view of the PCB board described in Example 1 of the present application;

[0034] FIG6 is a perspective view of the back side of the PCB board according to the first embodiment of the present application;

[0035] FIG7 is a perspective view of the wound battery cell assembly according to Example 1 of the present application;

[0036] FIG8 is a schematic diagram of the assembly of the circuit assembly according to the first embodiment of the present application;

[0037] FIG9 is a schematic diagram of the assembly of the circuit assembly and the plastic middle frame according to the first embodiment of the present application;

[0038] FIG10 is a front perspective view of the assembled circuit assembly and the plastic middle frame according to the first embodiment of the present application;

[0039] FIG11 is a rear perspective view of the assembled circuit assembly and the plastic middle frame according to the first embodiment of the present application;

[0040] FIG12 is a schematic diagram of the circuit assembly and the plastic middle frame after dispensing glue in the first embodiment of the present application;

[0041] FIG13 is a schematic diagram of the assembly process of placing the wound battery cell assembly into the metal housing according to the first embodiment of the present application;

[0042] FIG14 is a schematic diagram of the operation of welding the negative electrode tab to the metal housing according to the first embodiment of the present application;

[0043] FIG15 is a schematic diagram of the process of making a rolling groove on a metal shell according to the first embodiment of the present application;

[0044] FIG16 is a schematic diagram of welding the positive electrode tab to the low-voltage positive electrode cap in accordance with the first embodiment of the present application;

[0045] FIG17 is a schematic diagram of placing the circuit assembly and the plastic middle frame into the metal housing according to the first embodiment of the present application;

[0046] FIG18 is a schematic diagram of the process of producing a spinning edge on a metal housing in accordance with the first embodiment of the present application;

[0047] FIG19 is a schematic diagram of the process of pasting the positive and negative electrode separators onto the spinning edge in accordance with the first embodiment of the present application;

[0048] FIG20 is a schematic diagram of placing the metal shell into the insulating outer skin according to the first embodiment of the present application;

[0049] FIG21 is a schematic diagram of a state where the metal shell is placed into the insulating outer skin according to the first embodiment of the present application;

[0050] FIG22 is a schematic diagram of a state where an insulating outer skin is wrapped around a metal housing according to the first embodiment of the present application;

[0051] FIG23 is a perspective view of the 1.5V lithium battery described in Example 2 of the present application;

[0052] FIG24 is a schematic diagram of a half-section structure of a 1.5V lithium battery according to Example 2 of the present application;

[0053] Figure 25 is an enlarged view of point C in Figure 24;

[0054] FIG26 is a schematic diagram of the exploded structure of the 1.5V lithium battery described in Example 2 of the present application;

[0055] FIG27 is a rear perspective view of the PCB board and plastic middle frame assembly according to the second embodiment of the present application;

[0056] FIG28 is a front perspective view of the exploded structure of the PCB board and the plastic middle frame according to the second embodiment of the present application;

[0057] FIG29 is a back perspective view of the exploded structure of the PCB board and the plastic middle frame according to the second embodiment of the present application;

[0058] FIG30 is a schematic diagram of the exploded structure of the PCB board according to the second embodiment of the present application;

[0059] FIG31 is a perspective view of the 1.5V lithium battery described in Example 3 of the present application;

[0060] FIG32 is a schematic diagram of a half-section structure of a 1.5V lithium battery according to Example 3 of the present application;

[0061] Figure 33 is an enlarged view of point D in Figure 32;

[0062] FIG34 is a schematic diagram of a half-section structure of the 1.5V lithium battery according to the third embodiment of the present application from another angle;

[0063] Figure 35 is an enlarged view of point E in Figure 34;

[0064] FIG36 is a schematic diagram of the exploded structure of the 1.5V lithium battery described in Example 3 of the present application;

[0065] Figure 37 is a schematic diagram of the exploded structure of the PCB board and the plastic middle frame described in Example 3 of the present application.

[0066] Explanation of the accompanying symbols: 1. Circuit assembly; 11. PCB board; 111. Low-voltage positive copper ring; 112. Negative copper ring; 113. High-voltage positive copper ring; 114. Electronic component; 115. Common negative pad; 12. Low-voltage positive cap; 13. Negative spring; 131. Base ring; 132. Warping tab; 133. Base; 14. High-voltage positive cap; 15. Charging port; 16. Positive adapter; 17. Charging indicator light; 18. Positive contact spring; 2. Plastic middle frame; 21. Flange; 22. First through hole; 23. Accommodating cavity; 24. First buckle; 25. Thin-walled pressure relief hole; 26. Plastic upper shell; 261. Slot; 262. Button hole; 263. First avoidance hole; 264. Second avoidance hole; 27. Plastic lower shell; 271. Insert; 272. Second buckle; 273. Second through hole; 3. Wound cell assembly; 31. Wound cell; 32. Positive electrode tab; 33. Negative electrode tab; 34. Upper separator; 35. Lower separator; 4. Metal shell; 41. Rolling groove; 42. Spinning edge; 43. Charging port; 44. Light-transmitting hole; 5. Insulating outer shell; 51. Charging port; 52. Light-transmitting hole; 6. Sealing ring; 7. Potting compound; 8. Positive and negative electrode separators; 9. PCB board separator. DETAILED DESCRIPTION

[0067] The present application is further described in detail below with reference to Figures 1-37.

[0068] Example 1:

[0069] 1 to 22 , an embodiment of the present application discloses a 1.5V lithium battery, comprising a circuit assembly 1, a plastic middle frame 2, a wound cell assembly 3, a metal shell 4, and an insulating outer skin 5. The insulating outer skin 5 is coated on the outside of the metal shell 4, and the circuit assembly 1, the plastic middle frame 2, and the wound cell assembly 3 are sequentially arranged in the metal shell 4 from top to bottom. A rolling groove 41 is provided inwardly on the upper portion of the metal shell 4, and a spinning edge 42 is provided inwardly on the top portion. The rolling groove 41 confines the wound cell assembly 3 to the bottom of the metal shell 4. The plastic middle frame 2 is confined between the rolling groove 41 and the spinning edge 42, and is sealed with the metal shell 4. The circuit assembly 1 is arranged on the plastic middle frame 2. In this embodiment, the plastic middle frame 2 and the metal shell 4 are sealed by a tight fit.

[0070] 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 separator 34 and a lower separator 35. The positive electrode tab 32 passes through the center hole of the upper separator 34 and is electrically connected to the circuit assembly 1. The negative electrode tab 33 is wound around the side of the wound battery cell 31 to the bottom surface, and the end is welded to the bottom wall of the metal shell 4. The wound battery cell assembly 3 can choose the common ternary wound battery cell assembly or iron phosphate wound battery cell assembly on the market. Of course, other types of wound battery cell assemblies can also be selected. The voltage range is between 3.0-4.2V. After the voltage drop of the PCB board 11, a constant voltage of 1.5V is output. Since the various functional circuits on the PCB board 11 are already existing technologies, this application has no substantial improvement on this, so it will not be described in detail here. The insulating outer skin 5 of this application is preferably made of PVC material, which has the characteristics of heat shrinkage and can tightly wrap the metal shell 4 by blowing hot air.

[0071] Referring to Figures 5, 6, and 8, the circuit assembly 1 includes a PCB board 11, a low-voltage positive electrode cap 12, a negative electrode spring 13, and a high-voltage positive electrode cap 14. The front of the PCB board 11 is provided with a low-voltage positive electrode copper ring 111 and a negative electrode copper ring 112, and the back is provided with a high-voltage positive electrode copper ring 113. The low-voltage positive electrode cap 12 is soldered to the positive electrode copper ring via patch welding. The negative electrode spring 13 includes a base ring 131 and lift tabs 132 evenly distributed around the base ring 131. The back of the base ring 131 is soldered to the negative electrode copper ring 112 via patch welding. The lift tabs 132 are elastically pressed against the spun edge 42 of the metal housing 4. The high-voltage positive electrode cap 14 is soldered to the high-voltage positive electrode copper ring 113 via patch welding and serves as the 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 serves as the low-voltage output positive electrode of the lithium battery, and the metal shell 4 serves as the common negative electrode.

[0072] The PCB board 11 in the circuit assembly 1 of this embodiment also houses essential 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 the front, and a high-voltage positive copper ring 113 on the back. 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, achieving both high-voltage input and low-voltage output functions. This allows for a stable 1.5V low-voltage output and single-port charging and discharging capabilities, eliminating the need for any conductive cables. This results in higher electrical stability and simplifies the internal connection structure of the lithium battery, making it less prone to problems and safer.

[0073] The lift tab 132 is elastically pressed against the spun edge 42 of the metal housing 4 . The elastic pressing can prevent the metal housing 4 from being loosely pressed against the negative copper ring 112 on the PCB board 11 or from damaging the negative copper ring 112 .

[0074] Referring to Figure 3 , the inner wall of the plastic middle frame 2 is provided with a flange 21 for supporting the PCB 11. A potting compound 7 is also provided between the high-voltage positive electrode cap 14 and the plastic middle frame 2 to form a seal and isolate the electrolyte. The electronic components 114 on the PCB 11 are centrally arranged within the low-voltage positive electrode cap 12 and the high-voltage positive electrode cap 14. A positive and negative electrode separator 8 is also adhered above the spun edge 42, and a portion of the upper surface of the positive and negative electrode separator 8 is also wrapped by the insulating outer sheath 5.

[0075] The potting compound 7 fills the gap between the high-voltage positive electrode cap 14 and the plastic middle frame 2, providing a strong seal and isolating the electrolyte. This prevents the electrolyte from contacting the PCB 11 and causing corrosion, which could lead to premature failure of the PCB 11. By controlling the thickness and cross-sectional shape of the potting compound 7, the potting compound 7 can be given a specific strength. If an internal fault occurs within the wound battery cell assembly 3, the temperature and pressure will rise. When reaching a certain threshold, the potting compound 7 can be broken through to release the pressure, thus preventing the lithium battery from exploding due to overpressure.

[0076] The low-voltage positive cap 12 and the high-voltage positive cap 14 are both soldered to the PCB board 11 through patch welding. First, the connection strength is good and the fixation is reliable. Second, the cross-sectional area of ​​the connection is large, the resistance is small, and the conductivity is good. The electronic components 114 on the PCB board 11 are preferably arranged in a concentrated manner inside the low-voltage positive cap 12 and the high-voltage positive cap 14. First, the electronic components 114 are arranged reasonably, making full use of the internal space of the low-voltage positive cap 12 and the high-voltage positive cap 14; second, the low-voltage positive cap 12 and the high-voltage positive cap 14 are strong and can play a protective role. The electronic components 114 will not come into contact with the outside world and will not be damaged; third, they have a sealing effect to prevent water and dust from entering, thereby increasing the service life of the PCB board 11. The electronic components 114 in the high-voltage positive cap 14 of this application are three-in-one step-down chips, which belong to the existing technology and have the advantages of high integration and small size. The design of the PCB board 11 is easier. The electronic components 114 in the low-voltage positive cap 12 are components such as inductors, capacitors, and resistors. In addition, because the low-voltage positive electrode cap 12 is exposed and needs to be in contact with the outside, it is easily impacted, and a higher-strength fixed connection method is required. To this end, a flange 21 is provided on the low-voltage positive electrode cap 12. The flange 21 has a certain width, which is several times the wall thickness of the low-voltage positive electrode cap 12. Therefore, the contact area with the low-voltage positive electrode copper ring 111 is large, and the fixation is reliable and impact-resistant. Since the high-voltage positive electrode cap 14 is not exposed and will not be subject to external impact, the strength requirement is slightly lower, so the flange 21 can be omitted.

[0077] The positive and negative electrode separators 8 can prevent dust and other debris from entering between the negative electrode spring 13 and the low-voltage positive electrode cap 12 to avoid short circuit between the two. Part of the upper surface of the positive and negative electrode separators 8 is also wrapped by the insulating outer skin 5, which further fixes the positive and negative electrode separators 8.

[0078] The specific connection principle of the circuit is as follows: the positive electrode tab 32 of the wound battery cell assembly 3 is connected to the PCB board 11 through 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 through the metal shell 4, the negative electrode spring 13, and the negative electrode copper ring 112. After the circuit on the PCB board 11 is stepped down, 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 spring 13, and the metal shell 4.

[0079] This application directly places the wound cell assembly 3 within the metal housing 4, eliminating the need for a housing and reducing costs compared to the prior art methods of using soft-pack or hard-shell lithium cells. The wound cell assembly 3 is secured by the provision of a rolling groove 41. The rolling groove 41 and the upper spun edge 42 together compress and seal the plastic midframe 2, preventing electrolyte leakage and achieving an integrated compression seal.

[0080] The manufacturing method of the 1.5V lithium battery of this embodiment comprises the following steps:

[0081] 8 , first provide a PCB board 11, solder the low-voltage positive electrode cap 12 and the negative electrode spring 13 to the front of the PCB board 11, and solder the high-voltage positive electrode cap 14 to the back of the PCB board 11 to form a circuit assembly 1;

[0082] S1, referring to Figures 13 and 14, place the wound cell assembly 3 into the metal housing 4, press the wound cell assembly 3 against the bottom of the metal housing 4, and spot weld the bottom of the metal housing 4 to weld the negative electrode tab 33 to the metal housing 4;

[0083] S2, referring to FIG15 , a rolling groove 41 is made on the upper portion of the metal shell 4 by spinning; the wound battery cell assembly 3 is confined within the metal shell 4;

[0084] S3, adding electrolyte into the wound battery cell assembly 3;

[0085] S4, placing the circuit assembly 1 into the plastic middle frame 2; and applying a potting compound 7 on the back of the plastic middle frame 2 to form a sealing structure between the plastic middle frame 2 and the high-voltage positive electrode cap 14;

[0086] S5, referring to FIG16 , welding the positive electrode tab 32 of the wound battery cell assembly 3 to the lower surface of the high-voltage positive electrode cap 14 of the circuit assembly 1;

[0087] S6, referring to FIG17 , placing the circuit assembly 1 and the plastic middle frame 2 into the metal housing 4;

[0088] S7, referring to FIG. 18 , a spinning edge 42 is formed on the upper end of the metal housing 4 by spinning, so as to confine the circuit assembly 1 and the plastic middle frame 2 inside the metal housing 4;

[0089] S8, referring to FIG19 , the positive and negative electrode separators 8 are pasted above the spinning edge 42;

[0090] S9 , referring to FIG. 20 to FIG. 22 , wrap a layer of insulating outer skin 5 around the outside of the metal shell 4 .

[0091] The manufacturing method described in this application has reasonable procedures, high yield rate, and can be industrialized and mass-produced.

[0092] Example 2:

[0093] 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 can adopt a common interface such as miniUSB or TYPE-C in the prior art.

[0094] 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 spring 13, and a positive electrode adapter 16. The low-voltage positive electrode cap 12 is soldered to the upper surface of the PCB board 11 via patch welding, and the charging interface 15 and the positive electrode adapter 16 are arranged on the lower surface of the PCB board 11. A common negative electrode pad 115 is provided on the upper surface of the PCB board 11. The negative electrode spring 13 includes a base plate 133 and a plurality of tabs 132 arranged on the outer edge of the base plate 133. The back of the base plate 133 is soldered to the common negative electrode pad 115 via patch welding. The tabs 132 are elastically pressed against the spun 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 16, and the negative electrode tab 33 is welded and fixed to the bottom end of the metal shell 4. The PCB 11 is snapped into the plastic middle frame 2. A charging indicator light 17 is also provided on the PCB 11 to indicate when charging is in progress. Charging holes 51 and 43 and light-transmitting holes 52 and 44 are provided at the same locations on the insulating outer shell 5 and the metal shell 4. The plastic middle frame 2 is made of a transparent material.

[0095] The lift tab 132 elastically contacts the spun edge 42 of the metal housing 4 , thereby preventing the metal housing 4 from being loosely pressed against the negative electrode spring 13 or damaging the PCB 11 .

[0096] Referring to Figure 25 , a first through-hole 22 is provided in the middle of the bottom wall of the plastic middle frame 2. The positive electrode adapter 16 passes downward through the first through-hole 22 and is bent and connected to the positive electrode tab 32 by spot welding. Potting compound 7 is provided at the first through-hole 22 to form a seal to isolate the electrolyte. A positive and negative electrode separator 8 is also adhered above the spun edge 42. The outer portion of the positive and negative electrode separator 8 is wrapped by an insulating outer sheath 5. A PCB board separator 9 is also provided between the PCB board 11 and the spun edge 42 to prevent short circuits between the electronic components 114 or solder joints on the PCB board 11 and the spun edge 42. The interior of the plastic middle frame 2 is provided with a PCB board 11 accommodating cavity 23. A plurality of first clips 24 are dispersed on the inner wall of the upper end. The first clips 24 confine the PCB board 11 within the accommodating cavity 23. Since the first clips 24 have a certain elastic deformation capability, the PCB board 11 can be directly pressed into the accommodating cavity 23. The first clips 24 can prevent the PCB board 11 from falling out. The plastic midframe 2 also isolates the PCB 11 from the metal housing 4. A thin-walled pressure relief hole 25 is also provided on the bottom wall of the plastic midframe 2. Located below the charging port 15, this hole allows pressure relief by breaking through the thin wall in the event of a malfunction within the wound battery cell assembly 3, leading to a temperature rise and a sudden increase in pressure. This reduces the risk of lithium battery explosion. The thin-walled pressure relief hole 25 is very close to the charging ports 51 and 43, shortening the pressure relief path.

[0097] Referring to Figure 30 , the low-voltage positive electrode cap 12 is soldered to the PCB 11 via patch welding, providing reliable fixation and electrical connection. Some of the electronic components 114 on the PCB 11 are placed within the low-voltage positive electrode cap 12, fully utilizing the internal space of the low-voltage positive electrode cap 12. The low-voltage positive electrode cap 12 protects the internal electronic components 114 and provides a good seal to prevent water and dust ingress.

[0098] In this embodiment, the PCB board 11 is clamped into the plastic middle frame 2. The PCB board 11 cannot easily fall out of the plastic middle frame 2, which plays a fixing role. It can protect the PCB board 11 and prevent it from being compressed when processing the spinning edge 42. It can also isolate the PCB board 11 from the metal housing 4 to prevent short circuits.

[0099] Other structures and beneficial effects are consistent with those of embodiment 1 and will not be described again here.

[0100] Example 3:

[0101] The difference from the second embodiment is that the circuit assembly 1 has undergone significant changes, especially the arrangement of the charging interface 15.

[0102] Referring to Figures 31 to 37 , the circuit assembly 1 includes a PCB 11, a positive contact spring 18, a positive adapter plate 16, a negative spring 13, and a low-voltage positive cap 12. The plastic middle frame 2 includes a plastic upper shell 26 and a plastic lower shell 27 that interlock with each other. The PCB 11 is vertically positioned between the plastic upper shell 26 and the plastic lower shell 27, isolating the PCB 11 from the metal housing 4. The positive contact spring 18 is positioned at the upper end of the PCB 11, the positive adapter plate 16 is positioned at the lower end of the PCB 11, and the charging port 15 and the negative spring 13 are positioned in the middle of the PCB 11. The low-voltage positive cap 12 is positioned on the plastic upper shell 26. The positive contact spring 18 passes upward through the plastic upper shell 26 to elastically contact the inner wall of the low-voltage positive cap 12. The negative spring 13 elastically contacts the inner wall of the metal housing 4. The positive electrode tab 32 of the wound battery cell assembly 3 is welded to the positive electrode adapter 16. The positive and negative electrode separators 8 are arranged between the spun edge 42 and the low-voltage positive electrode cap 12, mainly to prevent short circuits between the metal shell 4 and the low-voltage positive electrode cap 12. The PCB board 11 is also provided with a charging indicator light 17, which serves as an indicator during charging. Charging holes 51, 43 and light-transmitting holes 52, 44 are provided at the same position of the insulating outer shell 5 and the metal shell 4. The plastic upper shell 26 and the plastic lower shell 27 are both made of transparent materials.

[0103] Referring to Figure 37 , the upper plastic shell 26 has a slot 261 on its side, with a buckle hole 262 on its sidewall. The lower plastic shell 27 has an insert 271, with a second buckle 272 located inside the insert 271. After the upper and lower plastic shells 26 and 27 are docked, the insert 271 is inserted into the slot 261, and the second buckle 272 is inserted into the buckle hole 262, thereby securing the upper and lower plastic shells 26 and 27 together. The sidewalls of the upper plastic shell 26 also have a first relief hole 263 and a second relief hole 264, respectively, for exposing the charging port 15 and the negative electrode spring 13.

[0104] Referring to Figure 35 , a sealing ring 6 is sleeved on the lower end of the plastic middle frame 2. This sealing ring 6 is compressed between the plastic middle frame 2 and the rolling groove 41, thereby achieving a seal between the plastic middle frame 2 and the metal shell 4. During the forming process of the spinning edge 42, the plastic middle frame 2 is pressed downward, and the sealing ring 6 is deformed by the compression, thus achieving a high degree of sealing and effectively preventing electrolyte leakage.

[0105] Referring to Figure 35 , a second through-hole 273 is provided in the middle of the bottom wall of the plastic lower shell 27. The positive electrode adapter 16 passes downward through the second through-hole 273, is bent, and then spot-welded to the positive electrode tab 32. Potting compound 7 is applied to the second through-hole 273 to form a seal, isolating the electrolyte from seeping into the PCB 11 through the second through-hole 273. This also controls the thickness of the potting compound 7 and serves as a pressure relief hole.

[0106] The plastic middle frame 2 provided in this embodiment can vertically arrange the PCB board 11 in the plastic middle frame 2. The charging interface 15 on the PCB board 11 is also arranged vertically. In this way, the charging interface 15 can be easily placed in the metal shell 4. In particular, when the lithium battery is in the form of a 7-size battery and is relatively small, the plastic middle frame 2 can protect the PCB board 11 and prevent it from being compressed during the processing of the spun edge 42. It can also be isolated from the metal shell 4 to prevent short circuits.

[0107] Other structures and beneficial effects are consistent with those of the second embodiment and will not be described again here.

[0108] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A 1.5V lithium battery, characterized in that: It includes a circuit assembly, a plastic middle frame, a wound battery cell assembly, a metal shell and an insulating outer skin. The insulating outer skin is covered on the outside of the metal shell. The circuit assembly, plastic middle frame and wound battery cell assembly are arranged in the metal shell from top to bottom. The upper part of the metal shell is provided with a rolling groove inward, and the top is provided with a spinning edge inward. The rolling groove confines the wound battery cell assembly to the bottom of the metal shell. The plastic middle frame is confined between the rolling groove and the spinning edge and realizes sealing with the metal shell. The circuit assembly is arranged on the plastic middle frame.

2. The 1.5V lithium battery according to claim 1, characterized in that The plastic middle frame and the metal shell are tightly fitted to achieve sealing.

3. The 1.5V lithium battery according to claim 1, characterized in that A sealing ring is sleeved on the lower end of the plastic middle frame, and the sealing ring is pressed tightly between the plastic middle frame and the rolling groove, thereby achieving sealing between the plastic middle frame and the metal shell.

4. The 1.5V lithium battery according to claim 1, characterized in that The wound battery cell assembly includes a wound battery cell, a positive electrode tab, a negative electrode tab, an upper separator and a lower separator. The positive electrode tab passes through the central hole of the upper separator and is electrically connected to the circuit assembly. The negative electrode tab is wound from the side of the wound battery cell to the bottom surface, and the end is welded to the bottom wall of the metal shell.

5. The 1.5V lithium battery according to claim 4, characterized in that: The circuit assembly includes a PCB board, a low-voltage positive electrode cap, a negative electrode spring and a high-voltage positive electrode cap. The front of the PCB board is provided with a low-voltage positive electrode copper ring and a negative electrode copper ring, and the back is provided with a high-voltage positive electrode copper ring. The low-voltage positive electrode cap is welded on the positive electrode copper ring through a patch. The lower surface of the negative electrode spring is welded on the negative electrode copper ring and its upper surface is crimped to the spun edge of the metal shell; the high-voltage positive electrode cap is welded on the high-voltage positive electrode copper ring through a patch and serves as a high-voltage positive electrode input terminal. The high-voltage positive electrode cap is connected to the positive electrode ear by welding. The low-voltage positive electrode cap serves as the low-voltage output positive electrode of the lithium battery, and the metal shell serves as a common negative electrode.

6. The 1.5V lithium battery according to claim 4, characterized in that: The circuit assembly includes a PCB board, a low-voltage positive electrode cap, a charging interface, a negative electrode spring and a positive electrode adapter. The low-voltage positive electrode cap is welded on the upper surface of the PCB board through a patch. The charging interface and the positive electrode adapter are arranged on the lower surface of the PCB board. A common negative electrode pad is provided on the upper surface of the PCB board. The negative electrode spring includes a substrate and a plurality of lifters arranged on the outer edge of the substrate. The back of the substrate is welded on the common negative electrode pad through a patch. The lifters are elastically crimped with the spun edge of the metal shell. The positive electrode tab of the wound battery cell assembly is welded and fixed to the positive electrode adapter, and the negative electrode tab is welded and fixed to the bottom end of the metal shell. The PCB board is clamped in the plastic middle frame. A charging indicator light is also provided on the PCB board. A charging hole and a light-transmitting hole are provided at the same position of the insulating outer skin and the metal shell. The plastic middle frame is made of transparent material.

7. The 1.5V lithium battery according to claim 4, characterized in that: The circuit assembly includes a PCB board, a positive contact spring, a positive adapter, a negative spring and a low-voltage positive cap. The plastic middle frame includes a plastic upper shell and a plastic lower shell that are buckled together. The PCB board is vertically arranged between the plastic upper shell and the plastic lower shell. The positive contact spring is arranged at the upper end of the PCB board, the positive adapter is arranged at the lower end of the PCB board, the charging interface and the negative spring are arranged in the middle of the PCB board, the low-voltage positive cap is arranged on the plastic upper shell, the positive contact spring passes through the plastic upper shell upward and elastically contacts the inner wall of the low-voltage positive cap, the negative spring is elastically contacted with the inner wall of the metal shell, the positive pole ear of the wound battery cell assembly is welded to the positive adapter, and a positive and negative separator is also provided between the spinning edge and the low-voltage positive cap. A charging indicator light is also provided on the PCB board. A charging hole and a light-transmitting hole are provided at the same position of the insulating skin and the metal shell. Both the plastic upper shell and the plastic lower shell are made of transparent material.

8. A method for manufacturing a 1.5V lithium battery according to any one of claims 1 to 7, characterized in that: The following steps are involved: S1, placing the wound battery cell assembly into a metal casing, pressing the wound battery cell assembly against the bottom of the metal casing, and spot welding the bottom of the metal casing to weld the negative electrode tab to the metal casing; S2, making a rolling groove on the upper part of the metal shell by spinning; confining the wound battery cell assembly in the metal shell; S3, adding electrolyte into the wound battery cell assembly; S4, placing the circuit components into the plastic middle frame; S5, welding the positive electrode tab of the wound battery cell assembly to the circuit assembly; S6, place the circuit components and plastic middle frame into the metal housing; S7, using a spinning method to produce a spinning edge on the upper end of the metal shell, confining the circuit components and the plastic middle frame inside the metal shell; S8, pasting the positive and negative electrode separators on the top of the spinning edge; S9, an insulating outer layer is wrapped around the metal shell.

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