1.5V lithium battery and its manufacturing method

Abstract

To provide a lithium battery and a manufacturing method thereof at reduced cost. [Solution] A 1.5V lithium battery and its manufacturing method, comprising a circuit assembly 1, a resin middle frame 2, a wound battery cell assembly 3, a metal shell 4 and an insulating outer cover 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, the metal shell has an inward rolling groove at the top and an inward spinning edge at the 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 to realize sealing between the metal shell, and the circuit assembly is arranged in the resin middle frame. This application directly arranges the wound battery cell assembly in the metal shell, which does not require a cover shell and is less costly than the prior art soft-pack lithium battery cells or hard-shell lithium battery cells.

Description

[Technical field]

[0001] The present application relates to the technical field of lithium batteries, and in particular to a 1.5V lithium battery and a method 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. The above prior art all use cylindrical battery cells, generally soft-pack battery cells or hard-shell battery cells, which require an additional metal shell on the outside, making the assembly process simple but expensive. Summary of the Invention

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

[0004] In one embodiment, the technical solution provided in this application is as follows: A 1.5V lithium battery, comprising: 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 coated on the outside of the metal shell, the circuit assembly, the resin middle frame, and the wound battery cell assembly are sequentially arranged in the metal shell from top to bottom, the metal shell has an inward rolling groove at the top and an inward spinning edge at the 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 to realize sealing between the metal shell, and the circuit assembly is arranged in the resin middle frame.

[0005] The present application directly places the wound battery cell assembly in the metal shell, which does not require a cover shell and is less costly than the soft-pack lithium battery cells or hard-shell lithium battery cells used in the prior art. The roll groove is provided to realize the fixing of the wound battery cell assembly, and the roll groove and the upper spinning edge press together with the resin middle frame to seal it, so that there is no leakage of electrolyte.

[0006] Preferably, a seal is achieved between the resin middle frame and the metal shell 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 achieving a seal 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 passes through a central hole in the upper insulating sheet and is electrically connected to a circuit assembly, and the negative electrode tab wraps from the side to the bottom of the wound battery cell and has 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 is provided with 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 includes a base ring and a warp 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 warp piece is elastically pressed 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 is used 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 is used as a low-voltage output positive electrode of the lithium battery, and the metal shell is used as a common negative electrode.

[0009] Preferably, a flange edge for supporting a PCB board is provided on an 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 concentratedly laid out in 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, and a charging hole and a light hole are provided at the same positions of the insulating outer shell 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 middle of the bottom wall of the resin middle frame, the positive adapter plate passes through the first through hole downward and is bent and then connected to the positive tab by spot welding, a potting adhesive is provided in the first through hole to form a seal and isolate the electrolyte, a positive and negative electrode insulating sheet is further attached above the spinning edge, and an outer portion of the positive and negative electrode insulating sheet is covered with an insulating skin, a PCB board insulating sheet is provided between the PCB board and the spinning edge to avoid a short circuit between the electronic elements or solder joints on the PCB board and the spinning edge, a PCB board accommodating cavity is provided inside the resin middle frame, a plurality of first fasteners are distributed on the inner wall of the upper end, and the first fasteners restrict the PCB board in the accommodating cavity, a thin-walled pressure relief hole is further provided on 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 a resin upper shell and a resin lower shell that are interlocked with each other, 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 contact spring passes upward through the resin upper shell and elastically contacts the inner wall of the low-voltage positive cap, the negative metal dome elastically contacts the inner wall of the metal shell, the positive tab of the wound battery cell assembly is welded to a positive adapter plate, a positive and negative insulating sheet is further provided between the spinning edge and the low-voltage positive cap, a charging indicator is further provided on the PCB board, a charging hole and a light hole are provided at the same positions of the insulating outer shell and the metal shell, and the resin upper shell and the resin lower shell are both made of a transparent material.

[0013] Preferably, a slot is provided on a side of the resin upper shell, a buttonhole is provided on a side wall of the slot, an insertion piece is provided on the resin lower shell, and a second fastener is provided on the inside of the insertion piece, and after the resin upper shell and the resin lower shell are butted together, the insertion 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 the side wall of the resin upper shell to expose the charging interface and the negative electrode metal dome, respectively.

[0014] In another aspect, the present application provides a method for producing a method for manufacturing a semiconductor device comprising: S1, placing the wound battery cell assembly in a metal shell, pressing the wound battery cell assembly against a 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 electrolyte into the wound battery cell assembly; and S4, in which the circuit assembly is placed in the resin middle frame; S5 welding a positive tab of the wound battery cell assembly to the circuit assembly; S6 disposing the circuit assembly and the resin middle frame in the metal shell; S7: A spinning edge is formed on the upper end of the metal shell by spinning, and the circuit assembly and the resin middle frame are fixed inside the metal shell; S8: attaching a positive and negative insulating sheet to the upper part of the spinning edge; and 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 in 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 achieve sealing by pressing, so that there is no leakage of electrolyte; 2. This application provides the necessary circuits such as step-down circuit, voltage stabilization circuit, charging circuit, over-discharge protection circuit, etc. 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 stability of the electrical performance is high. [Brief description of the drawings]

[0016] [Figure 1] FIG. 1 is a perspective view of the 1.5 V lithium battery of Example 1 of the present application. [Diagram 2] FIG. 2 is a schematic diagram of the half-section structure of the 1.5V lithium battery in Example 1 of the present application. [Diagram 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. [Diagram 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 of the first embodiment of the present application. [Figure 7] FIG. 7 is a perspective view of the wound battery cell assembly of the first embodiment 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 an 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 diagram of Example 1 of the present application after dispensing between the circuit assembly and the resin middle frame. [Figure 13] FIG. 13 is an assembly operation schematic diagram in which the wound battery cell assembly of the first embodiment of the present application is disposed in a metal shell. [Figure 14] FIG. 14 is an operational schematic diagram of the negative electrode tab of Example 1 of the present application welded to a metal shell. [Figure 15] FIG. 15 is a schematic diagram of the operation of forming a roll groove in the metal shell according to the first embodiment 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 an operational schematic diagram of the circuit assembly and the resin middle frame according to the first embodiment of the present application disposed in a metal shell. [Figure 18] FIG. 18 is a schematic diagram of the operation of forming a spinning edge on the metal shell in the first embodiment of the present application. [Figure 19] FIG. 19 is a schematic diagram showing the operation of the positive and negative electrode insulating sheets according to the first embodiment of the present application attached to a spinning edge. [Figure 20] FIG. 20 is a schematic diagram showing the operation of the metal shell according to the first embodiment of the present application 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-sectional structure of the 1.5V lithium battery of Example 2 of the present application. [Diagram 25] FIG. 25 is an enlarged view of part C in FIG. [Figure 26] FIG. 26 is a schematic exploded view of the structure of the 1.5V lithium battery according to the second embodiment 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. [Diagram 30] FIG. 30 is an exploded structural schematic diagram of the PCB board of the second embodiment of the present application. [Diagram 31] FIG. 31 is a perspective view of the 1.5V lithium battery of Example 3 of the present application. [Diagram 32] FIG. 32 is a schematic diagram of a half-sectional structure of the 1.5 V lithium battery of Example 3 of the present application. [Diagram 33] FIG. 33 is an enlarged view of part D in FIG. [Diagram 34] FIG. 34 is a schematic half-sectional structural diagram of the 1.5V lithium battery in Example 3 of the present application from another angle. [Diagram 35] FIG. 35 is an enlarged view of part E in FIG. [Diagram 36] FIG. 36 is a schematic exploded view of the 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 PREFERRED EMBODIMENTS

[0017] The present application will be described in further detail below with reference to FIGS. Example 1:

[0018] 1 to 22, the 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 cover 5, in which the insulating outer cover 5 is coated on the outside of the metal shell 4, and the circuit assembly 1, the resin middle frame 2, and the wound battery cell assembly 3 are sequentially provided in the metal shell 4 from top to bottom. The metal shell 4 has an inwardly rolling groove 41 at the top and an inwardly spinning edge 42 at the top, and the rolling groove 41 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, and is sealed with the metal shell 4. The circuit assembly 1 is provided in 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 the center hole of the upper insulating sheet 34 and is electrically connected to the circuit assembly 1, and the negative electrode tab 33 is wound from the side to the bottom of the wound battery cell 31, and the end is welded to the bottom wall of the metal shell 4. The wound battery cell assembly 3 may be a ternary wound battery cell assembly or an iron phosphate wound battery cell assembly commonly seen on the market, or of course other types of wound battery cell assemblies may be selected, and the voltage range is 3.0 to 4.2 V, and a constant voltage of 1.5 V is output by stepping down the PCB board 11. Since the various functional circuits in the PCB board 11 are conventional technologies, the present application does not substantially improve them, so no further description will be given 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.

[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 includes a low-voltage positive electrode copper ring 111 and a negative electrode copper ring 112 on the front side, and a high-voltage positive electrode copper ring 113 on the rear side. The low-voltage positive electrode cap 12 is welded to the positive electrode copper ring by a patch, and the negative electrode metal dome 13 includes a base ring 131 and a warp piece 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, and the warp piece 132 is elastically pressed to 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 is used 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 stabilizing circuit, a charging circuit, and an over-discharge protection circuit. The PCB board 11 is characterized in that it has a low-voltage positive copper ring 111 and a negative copper ring 112 on the front side, a high-voltage positive copper ring 113 on the back side, the low-voltage positive copper ring 111 is a low-voltage output positive electrode, the high-voltage positive copper ring 113 is a high-voltage input positive electrode, and the negative copper ring 112 is a common negative electrode, and is electrically connected to an external conductive member through these three copper rings to realize the functions of high-voltage input and low-voltage output, and can stably output a low voltage of 1.5V, and realizes a same-port charging and discharging function, and does not need to wire a conductive cable, making the electrical performance more stable, simplifying the internal connection structure of the lithium battery, and making it safer and less prone to trouble.

[0022] The warped piece 132 is elastically compressed to the spinning edge 42 of the metal shell 4, and the elastic compression can avoid the occurrence of a situation where the compression between the metal shell 4 and the negative copper ring 112 on the PCB board 11 is not firm or the negative copper ring 112 is crushed.

[0023] 3, a flange edge 21 for supporting a PCB board 11 is provided on an inner wall of the resin middle frame 2. A potting adhesive 7 is further provided between the high-voltage positive electrode cap 14 and the resin middle frame 2 to form a hermetic seal and isolate the electrolyte. Electronic elements 114 on the PCB board 11 are concentratedly laid out within the low-voltage positive electrode cap 12 and the high-voltage positive electrode cap 14. A positive and negative electrode insulating sheet 8 is further attached above the spinning edge 42, and a part of the upper surface of the positive and negative electrode insulating sheet 8 is also covered by an insulating outer skin 5.

[0024] The potting adhesive 7 can fill the gap between the high voltage positive electrode cap 14 and the resin middle frame 2, have a good sealing effect, isolate the electrolyte, and prevent the electrolyte from contacting with the PCB board 11 and corroding, which will cause the PCB board 11 to fail early. By controlling the thickness and cross-sectional shape of the potting adhesive 7, the potting adhesive 7 can be endowed with a certain strength, and when an internal fault occurs inside the wound battery cell assembly 3, the temperature and air pressure increase until they reach a certain threshold, and the potting adhesive 7 can be broken to release the pressure, thereby avoiding 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 a patch, which has the following advantages: first, high connection strength and reliable fixation; second, the cross-sectional area of ​​the connection is large, the resistance is small, and the conductive performance is good. The electronic components 114 on the PCB board 11 are preferably arranged intensively in the low-voltage positive cap 12 and the high-voltage positive cap 14; first, the layout of the electronic components 114 is reasonable, and the internal space of the low-voltage positive cap 12 and the high-voltage positive cap 14 is fully utilized; second, the strength of the low-voltage positive cap 12 and the high-voltage positive cap 14 is high, and the electronic components 114 are protected from contact with the outside world and are not damaged; and third, a sealing effect is achieved, which prevents water and dust from entering, and extends the service life of the PCB board 11. In this application, the electronic element 114 in the high-voltage positive cap 14 is a three-in-one step-down chip, which belongs to the prior art and has the advantages of high integration and small size, making the design of the PCB board 11 simpler, and the electronic element 114 in the low-voltage positive cap 12 is an inductor, a capacitor, a resistor, and other elements. In addition, the low-voltage positive cap 12 is exposed and may be in contact with the outside, and is easily impacted, so a stronger connection method needs to be used. For this reason, the low-voltage positive cap 12 is particularly provided with a flange edge 21, which has a certain width and is several times the thickness of the low-voltage positive cap 12, so that the contact area with the low-voltage positive copper ring 111 is large, and the high-voltage positive cap 14 is firmly fixed and impact resistant. Since the high-voltage positive cap 14 is not exposed, is not impacted from the outside, and has a relatively low requirement for strength, the flange edge 21 does not need to be provided.

[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 the two. A portion of the upper surface of the positive and negative electrode insulating sheets 8 is also covered by the insulating outer skin 5, which serves to further stabilize the positive and negative electrode insulating sheets 8.

[0027] Specific connection principle of the circuit: 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] The present application directly places the wound battery cell assembly 3 in the metal shell 4, which does not require a cover shell and is less expensive than the soft-packed lithium battery cells or hard-shelled lithium battery cells used in the prior art. The roll groove 41 is provided to fix the wound battery cell assembly 3, and the roll groove 41 presses and seals the resin middle frame 2 together with the upper spinning edge 42, preventing electrolyte leakage and realizing sealing by pressing together.

[0029] The manufacturing method of the 1.5V lithium battery of this embodiment is as follows: Referring to FIG. 8, the steps are as follows: first, a PCB board 11 is provided; a patch of a low voltage positive cap 12 and a patch of a negative metal dome 13 are welded to the front side of the PCB board 11; and a patch of a high voltage positive cap 14 is welded to the back side of the PCB board 11 to form a circuit assembly 1; 13 and 14, the following steps are performed: (S1) the wound battery cell assembly 3 is placed in a metal shell 4, the wound battery cell assembly 3 is pressed against the bottom of the metal shell 4, and spot-welded to the bottom of the metal shell 4 to weld the negative electrode tab 33 to the metal shell 4; Referring to FIG. 15, a roll groove 41 is formed on 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 electrolyte into the wound battery cell assembly (3) (S3); S4: placing the circuit assembly 1 in the resin middle frame 2 and dotting the back surface of the resin middle frame 2 with a potting adhesive 7 to form a sealed structure between the resin middle frame 2 and the high voltage positive electrode cap 14; Referring to FIG. 16, welding the positive tab 32 of the wound battery cell assembly 3 to the underside of the high voltage positive cap 14 of the circuit assembly 1 (S5); Referring to FIG. 17, the circuit assembly 1 and the resin middle frame 2 are placed in the metal shell 4 in S6; 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 restricted 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 cover 5 is wrapped around the outside of 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 cap 12, a charging interface 15, a negative metal dome 13, and a positive adapter plate 16, the low-voltage positive cap 12 is welded to the upper surface of the PCB board 11 by a patch, and the charging interface 15 and the positive 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 metal dome 13 includes a substrate 133 and a plurality of warped pieces 132 provided on the outer edge of the substrate 133, the rear surface of the substrate 133 is welded to the common negative pad 115 by a patch, the warped pieces 132 are elastically pressed against the spinning edge 42 of the metal shell 4, the positive tab 32 of the wound battery cell assembly 3 is welded and fixed to the positive adapter plate 16, and the negative 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 the PCB board 11 is further provided with a charging indicator 17 that functions as an indicator during charging. Charging holes 51, 43 and light holes 52, 44 are provided at the same positions of 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, so as to avoid the occurrence of a situation where the metal shell 4 and the negative metal dome 13 are not firmly pressed together, or the PCB board 11 is crushed.

[0034] 25, a first through hole 22 is provided in the middle of the bottom wall of the resin middle frame 2, the positive adapter plate 16 passes through the first through hole 22 downward, is bent, and then is connected to the positive tab 32 by spot welding, and 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 an outer portion of the positive and negative electrode insulating sheet 8 is wrapped by an insulating outer skin 5, and 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 element 114 or the solder joint on the PCB board 11 and the spinning edge 42. A cavity 23 for accommodating the PCB board 11 is provided inside the resin middle frame 2, and a plurality of first fasteners 24 are distributed on the inner wall at the upper end, and the first fasteners 24 restrict the PCB board 11 within the accommodating cavity 23, and since the first fasteners 24 have a certain degree of elastic deformation ability, the PCB board 11 can be simply pressed into the accommodating cavity 23 as is, and the first fasteners 24 can prevent the PCB board 11 from coming out. The resin middle frame 2 further 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 fault occurs inside the wound battery cell assembly 3, the temperature increases, and the air pressure rises suddenly, the thin wall can be broken to release the pressure, thereby reducing the risk of the lithium battery exploding. The thin-walled pressure relief hole 25 is very close to the charging holes 51, 43, and has a short pressure relief path.

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

[0036] In this embodiment, the PCB board 11 is snap-fitted 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 the PCB board 11, protect the PCB board 11, and prevent the PCB board 11 from being pressed during processing of the spinning edge 42. The PCB board 11 can also be isolated from the metal shell 4, and no short circuit will occur.

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

[0038] As a difference from the second embodiment, the layout method 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 a resin upper shell 26 and a resin lower shell 27 that are interlocked with each other, and 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 has the effect of isolating 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 middle 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 is in elastic contact with 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 a short circuit 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, 43 and light holes 52, 44 are provided at the same positions of the insulating outer cover 5 and the metal shell 4, and the resin upper shell 26 and the resin lower shell 27 are both made of a transparent material.

[0040] 37, a slot 261 is provided on a side of the resin upper shell 26, a buttonhole 262 is provided on a side wall of the slot 261, an insert piece 271 is provided on the resin lower shell 27, and a second fastener 272 is provided on the inside of 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, so that the resin upper shell 26 and the resin lower shell 27 are engaged and fixed as a single body. A first escape hole 263 and a second escape hole 264 are further provided 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 the leakage of electrolyte.

[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 adapter plate 16 passes through the second through-hole 273 downward and is bent, and then connected to the positive 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, and the electrolyte permeates through the second through-hole 273 and contacts the PCB board 11, while controlling the thickness of the potting adhesive 7, which may also be used 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 laid out vertically. 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 a AAA battery and is small in size, the resin middle frame 2 can protect the PCB board 11 and prevent the PCB board 11 from being pressed during processing of the spinning edge 42, 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 be included in 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 copper ring 113, high voltage positive 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 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, 2nd escape hole 27. Resin lower shell 271, Insert 272, second fastener 273, second through hole 3. Winding 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 shell 51, charging hole 52. Light Hall 6. Seal ring 7. Potting adhesive 8. Positive and negative electrode insulation sheet 9. PCB board insulation sheet

Claims

1. A 1.5V lithium battery, a circuit assembly, a resin middle frame, a wound battery cell assembly, a metal shell, and an insulating outer skin, the insulating outer skin being coated on the outside of the metal shell, the circuit assembly, the resin middle frame, and the wound battery cell assembly being arranged in the metal shell from top to bottom, the metal shell having an inward rolling groove at its top and an inward spinning edge at its 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 sealing between the metal shell, the circuit assembly being arranged in the resin middle frame, 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 of the upper insulating sheet and is electrically connected to a circuit assembly, and the negative electrode tab is wound from the side to the bottom of the wound battery cell, and an end is welded to the bottom wall of the metal shell; 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, and a charging hole and a light hole are provided at the same positions of the insulating outer shell and the metal shell, and the resin middle frame is made of a transparent material. 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 circuit assembly includes a PCB board, a low-voltage positive cap, a negative metal dome and a high-voltage positive cap, the PCB board is provided with a low-voltage positive copper ring and a negative copper ring on the front side and a high-voltage positive copper ring on the back side, the low-voltage positive cap is welded to the positive copper ring by a patch, the negative metal dome is welded to the negative copper ring on the bottom side and is pressed to the spinning edge of the metal shell on the top side, the high-voltage positive cap is welded to the high-voltage positive copper ring by a patch and serves as a high-voltage positive input terminal, the high-voltage positive cap is connected to a positive tab by welding, the low-voltage positive cap serves as a low-voltage output positive electrode of the lithium battery, and the metal shell serves as a common negative electrode.

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

5. 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 on the resin upper shell. The positive contact spring passes upward through the resin upper shell and elastically contacts the inner wall of the low-voltage positive cap, the negative metal dome elastically contacts the inner wall of the metal shell, the positive tab of the wound battery cell assembly is welded to a positive adapter plate, a positive and negative insulating sheet is further provided between the spinning edge and the low-voltage positive cap, a charging indicator is further provided on the PCB board, a charging hole and a light hole are provided at the same positions of 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.

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

6. A method for producing the 1.5 V lithium battery according to any one of claims 1 to 5, comprising the steps of: Step 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; Step S2: creating 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; Step S3 of injecting an electrolyte into the wound battery cell assembly; Step S4: placing the circuit assembly in the resin middle frame; Step S5 of welding the positive tab of the wound battery cell assembly to the circuit assembly; Step S6: placing the circuit assembly and the resin middle frame in the metal shell; Step S7: forming a spinning edge on the upper end of the metal shell by spinning, and restricting the circuit assembly and the resin middle frame inside the metal shell; Step S8: attaching a positive and negative electrode insulating sheet to the upper part of the spinning edge; and step S9 of wrapping a layer of insulating outer covering around the metal shell. A method for producing a 1.5V lithium battery.

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