1.5 V lithium battery with charging interface

Abstract

The utility model relates to a 1.5 V lithium battery with a charging interface, the 1.5 V lithium battery comprises a PCB, a plastic middle frame, a winding cell assembly, an insulating sheath and a metal shell, the metal shell is provided with a rolling groove and a spinning edge, the rolling groove and the spinning edge are used for fixing the winding cell assembly and the plastic middle frame, and the PCB is clamped in the plastic middle frame; a positive electrode cap is arranged on the upper surface of the PCB, a charging interface and a positive electrode adapter plate are arranged on the lower surface of the PCB, a common negative electrode is arranged on the upper surface of the PCB and electrically connected with the metal shell, a positive electrode lug of the winding battery cell assembly is electrically connected with the positive electrode adapter plate, and a negative electrode lug is electrically connected with the metal shell. The metal shell is an integral body, is good in strength, has a good fixing effect on the winding battery core assembly and the plastic middle frame, does not need to be welded, and is lower in processing difficulty and cost than welding. The PCB is clamped in the plastic middle frame, so that the PCB cannot be easily separated from the plastic middle frame, the PCB is prevented from being pressed when a spinning edge is processed, the PCB can be isolated from the metal shell, and short circuit is avoided.

Description

Technical Field

[0001] The present application relates to the technical field of lithium batteries, and in particular to a 1.5V lithium battery with a charging interface. Background Art

[0002] No. 5 and No. 7 batteries are very common batteries with a voltage of 1.5V. They are widely used in remote controls, electric toys and other devices. They are generally disposable batteries and are not environmentally friendly. Lithium batteries have the advantages of high energy density and high charging times, but the voltage of lithium battery cells is generally 3.0-4.2V. Even if they are made into the size of No. 5 and No. 7 batteries, they cannot be directly applied to various existing devices.

[0003] For this purpose, some people have designed a lithium battery that can step down the voltage and reduce the output voltage to 1.5V, which can replace the existing disposable batteries. For example, the Chinese patent application with publication number CN216624417U and the name "A 1.5V constant voltage lithium battery" adds a conductive cap, a step-down circuit board and a bracket on the basis of the existing lithium battery cell. The step-down circuit board and the bracket are both arranged in the conductive cap, and the conductive cap is then fixed to the lithium battery cell by welding. The step-down circuit board is provided with a pin, which is electrically connected to the positive and negative electrodes of the lithium battery cell. First, the conductive cap is fixed to the lithium battery cell by welding, which has high processing cost and high processing defect rate. Secondly, although the pin has a leveling effect, the reliability of the electrical connection is general, which is not as reliable as welding and needs to be improved. Utility Model Content

[0004] In order to solve the technical problems of high processing cost and unreliable internal electrical connection of existing 1.5V lithium batteries, the utility model provides a 1.5V lithium battery with a charging interface.

[0005] The technical solution provided in the present application is as follows: a 1.5V lithium battery with a charging interface, comprising a PCB board, a plastic middle frame, a wound battery cell assembly, an insulating outer skin and a metal shell, wherein the upper side of the metal shell is provided with a rolling groove, and the top is provided with a spun edge, the wound battery cell assembly is confined by the rolling groove to the inner bottom of the metal shell, the plastic middle frame is located inside the metal shell and is confined between the rolling groove and the spun edge, and the PCB board is clamped in the plastic middle frame; the upper surface of the PCB board is provided with a positive electrode cap, the lower surface is provided with a charging interface and a positive electrode adapter, the upper surface of the PCB board is provided with a common negative electrode, the common negative electrode is electrically connected to the metal shell, the positive electrode ear of the wound battery cell assembly is electrically connected to the positive electrode adapter, and the negative electrode ear is electrically connected to the metal shell, the insulating outer skin is coated on the outside of the metal shell, and a charging hole is provided at the same position of the insulating outer skin and the metal shell.

[0006] By adopting the above technical solution, the present application sets a rolling groove and a spinning edge on the metal shell, limits the wound battery cell assembly to the inner bottom of the metal shell, and limits the plastic middle frame between the rolling groove and the spinning edge. The metal shell is a whole, has good strength, and has a good fixing effect on the wound battery cell assembly and the plastic middle frame. It does not require welding, and the processing difficulty and cost of the rolling groove and the spinning edge are lower than welding. The PCB board is clamped in the plastic middle frame, and the PCB board cannot easily fall out of the plastic middle frame, which plays a fixing role, can protect the PCB board, prevent the PCB board from being compressed when processing the spinning edge, and can be isolated from the metal shell to prevent short circuit.

[0007] Preferably, a through hole is provided in the middle of the bottom wall of the plastic middle frame, and the positive electrode adapter plate passes downward through the through hole and is connected to the positive electrode tab by spot welding after being bent. A potting glue is provided at the through hole to form a seal to isolate the electrolyte.

[0008] Preferably, a negative electrode spring is soldered to the common negative electrode on the PCB board, and the PCB board is electrically connected to the metal shell via the negative electrode spring.

[0009] Preferably, the negative electrode spring sheet comprises a substrate and a plurality of lift pieces arranged at the outer edge of the substrate, the back side of the substrate is welded to the common negative electrode by patch welding, and the lift pieces are elastically abutted against the spun edge of the metal shell.

[0010] Preferably, 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. A PCB board separator is also provided between the PCB board and the spun edge to prevent electronic components or solder joints on the PCB board from short-circuiting with the spun edge.

[0011] Preferably, a PCB board accommodating cavity is provided inside the plastic middle frame, and a plurality of buckles are dispersedly provided on the inner wall of the upper end, and the buckles confine the PCB board in the accommodating cavity.

[0012] Preferably, the positive electrode cap is soldered on a PCB board through a patch, and some electronic components on the PCB board are placed inside the positive electrode cap.

[0013] Preferably, the wound battery cell assembly includes a wound battery cell, an upper isolation sheet and a lower isolation sheet, the positive electrode tab passes through the central hole of the upper isolation sheet, and the end is welded to the lower surface of the positive electrode connecting sheet; 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.

[0014] Preferably, a charging indicator light is also provided on the PCB board, a light-transmitting hole is provided at the same position of the insulating outer skin and the metal shell, and the plastic middle frame is made of a transparent material.

[0015] Preferably, a thin-wall pressure relief hole is further provided on the bottom wall of the plastic middle frame, and the thin-wall pressure relief hole is located below the charging port.

[0016] In summary, the present application includes at least one of the following beneficial technical effects:

[0017] 1. The metal shell of the present application can fix the wound battery cell assembly and the plastic middle frame at the same time. The metal shell is a whole, has good strength, and has a good fixing effect on the wound battery cell assembly and the plastic middle frame. It does not require welding, and the processing difficulty and cost are lower than welding;

[0018] 2. The PCB board is clamped in the plastic middle frame. The PCB board cannot be easily removed from the plastic middle frame. It plays a fixing role, can protect the PCB board, prevent the PCB board from being pressed during the spinning edge processing, and can be isolated from the metal shell to prevent short circuit;

[0019] 3. A thin-wall pressure relief hole is set on the bottom wall of the plastic middle frame. Once a fault occurs inside the wound battery cell assembly, the thin wall can be broken to release pressure, reducing the risk of lithium battery explosion. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a three-dimensional diagram of a lithium battery according to an embodiment of the present application;

[0021] Figure 2 is a schematic diagram of a half-section structure of a lithium battery according to an embodiment of the present application;

[0022] Figure 3 yes Figure 2 Enlarged view of point A in the middle;

[0023] Figure 4 yes Figure 2 Enlarged view of point B in the middle;

[0024] Figure 5 is a schematic diagram of the exploded structure of the lithium battery described in the embodiment of the present application;

[0025] Figure 6 It is a back perspective view of the PCB board and the plastic middle frame assembly described in the embodiment of the present application;

[0026] Figure 7 It is a front perspective view of the exploded structure of the PCB board and the plastic middle frame described in the embodiment of the present application;

[0027] Figure 8 It is a back perspective view of the exploded structure of the PCB board and the plastic middle frame described in the embodiment of the present application;

[0028] Fig. 9 is a schematic diagram of the exploded structure of the PCB board described in the embodiment of the present application;

[0029] Fig.10 A three-dimensional diagram of the wound battery cell assembly described in an embodiment of the present application.

[0030] Explanation of the reference numerals: 1. PCB board; 11. Positive electrode cap; 12. Charging interface; 13. Positive electrode adapter; 14. Common negative electrode; 15. Negative electrode spring; 151. Substrate; 152. Warp piece; 16. Electronic component; 17. Charging indicator light; 18. PCB board spacer; 2. Plastic middle frame; 21. Through hole; 22. Buckle; 23. Accommodating cavity; 24. Thin-walled pressure relief hole; 3. Wound battery cell assembly; 31. Positive electrode ear; 32. Negative electrode ear; 33. Wound battery cell; 34. Upper spacer; 35. Lower spacer; 4. Insulating skin; 41. Charging hole; 42. Light-transmitting hole; 5. Metal shell; 51. Rolling groove; 52. Spinning edge; 53. Charging hole; 54. Light-transmitting hole; 6. Potting glue; 7. Positive and negative electrode spacers. DETAILED DESCRIPTION

[0031] The following is combined with Figure 1-10 This application is described in further detail.

[0032] Reference Figures 1 to 5 The embodiment of the present application discloses a 1.5V lithium battery with a charging interface, including a PCB board 1, a plastic middle frame 2, a wound battery cell assembly 3, an insulating outer skin 4 and a metal shell 5, wherein the upper side of the metal shell 5 is provided with a rolling groove 51, and the top is provided with a spinning edge 52, the wound battery cell assembly 3 is limited to the inner bottom of the metal shell 5 by the rolling groove 51, the plastic middle frame 2 is located inside the metal shell 5, and is limited between the rolling groove 51 and the spinning edge 52, and the PCB board 1 is clamped in the plastic middle frame 2; A positive electrode cap 11 is provided on the upper surface of the PCB board 1, and a charging interface 12 and a positive electrode adapter 13 are provided on the lower surface. A common negative electrode 14 is provided on the upper surface of the PCB board 1, and the common negative electrode 14 is electrically connected to the metal shell 5. The positive electrode tab 31 of the wound battery cell assembly 3 is electrically connected to the positive electrode adapter 13, and the negative electrode tab 32 is electrically connected to the metal shell 5. The insulating outer skin 4 is covered on the outside of the metal shell 5, and charging holes 41 and 53 are provided at the same position of the insulating outer skin 4 and the metal shell 5.

[0033] The PCB board 1 described in the present application integrates a step-down circuit, a charging and discharging circuit, and a protection circuit. The existing necessary circuits can be used, and the circuit principle does not need to be improved too much.

[0034] Reference Figure 3 and Figure 6 A through hole 21 is provided in the middle of the bottom wall of the plastic middle frame 2, and the positive electrode adapter 13 passes through the through hole 21 downward, and is connected to the positive electrode tab 31 by spot welding after being bent. A potting glue 6 is provided at the through hole 21 to form a seal to isolate the electrolyte and prevent the electrolyte from penetrating from the through hole 21 and contacting the PCB board 1. The present application realizes the electrical connection between the positive electrode tab 31 and the PCB board 1 by welding, and the connection is more reliable.

[0035] Reference Fig. 9 , the common negative electrode 14 on the PCB board 1 is also welded with a negative electrode spring 15, and the PCB board 1 is electrically connected to the metal shell 5 through the negative electrode spring 15. The negative electrode spring 15 includes a substrate 151 and a plurality of lift pieces 152 arranged on the outer edge of the substrate 151. The back of the substrate 151 is welded on the common negative electrode 14 through a patch, and the lift pieces 152 are elastically abutted against the spinning edge 52 of the metal shell 5. The elastic crimping can prevent the metal shell 5 from being loosely crimped to the common negative electrode 14 on the PCB board 1, or from damaging the common negative electrode 14.

[0036] Reference Figure 3 A positive and negative electrode separator 7 is also pasted on the top of the spinning edge 52, mainly to prevent short circuit between the metal shell 5 and the positive electrode cap 11. The outer part of the positive and negative electrode separator 7 is wrapped by the insulating outer skin 4 to further prevent the positive and negative electrode separator 7 from falling off. A PCB board separator 18 is also provided between the PCB board 1 and the spinning edge 52 to prevent short circuit between the electronic components or solder joints on the PCB board 1 and the spinning edge 52.

[0037] Reference Figure 7 The plastic middle frame 2 has a receiving cavity 23 for the PCB board 1, and a plurality of buckles 22 are dispersedly provided on the inner wall of the upper end, and the buckles 22 confine the PCB board 1 in the receiving cavity 23. Since the buckles 22 have a certain elastic deformation ability, the PCB board 1 can be directly pressed into the receiving cavity 23, and the buckles 22 can prevent the PCB board 1 from falling out. The plastic middle frame 2 also has the effect of isolating the PCB board 1 from the metal shell 5.

[0038] Reference Fig. 9 The positive electrode cap 11 is soldered on the PCB board 1 through a patch, and the fixation and electrical connection are relatively reliable. Some electronic components 16 on the PCB board 1 are placed in the positive electrode cap 11, which makes full use of the internal space of the positive electrode cap 11. The positive electrode cap 11 protects the internal electronic components 16 and has a good sealing effect to prevent water and dust from entering.

[0039] Reference Fig.10 The wound cell assembly 3 includes a wound cell 33, an upper separator 34 and a lower separator 35. The positive electrode tab 31 passes through the central hole of the upper separator 34, and the end is welded to the lower surface of the positive electrode connecting sheet; the negative electrode tab 32 is wound from the side of the wound cell 33 to the bottom surface, and the end is welded to the bottom wall of the metal shell 5. The present application directly puts the wound cell 33 into the metal shell 5, which has one less layer of wrapping shell than the soft-pack lithium battery or hard-shell lithium battery in the prior art, and has lower cost. By setting the rolling groove 51, the wound cell assembly 3 is sealed, and it is not easy to leak the electrolyte; the spinning edge 52 at the upper end presses and seals the plastic middle frame 2 to achieve an integrated seal.

[0040] Reference Figure 5 The PCB board 1 is also provided with a charging indicator light 17, the insulating outer skin 4 and the metal shell 5 are provided with light-transmitting holes 42 and 54 at the same position, and the plastic middle frame 2 is made of a transparent material, which can directly transmit light, and plays an indicating role during charging.

[0041] Reference Figure 3 and Figure 7 A thin-walled pressure relief hole 24 is also provided on the bottom wall of the plastic middle frame 2. The thin-walled pressure relief hole 24 is located below the charging interface 12. Once a fault occurs inside the wound battery cell assembly 3, resulting in a rise in temperature and a sharp increase in air pressure, the thin wall can be broken to release pressure, thereby reducing the risk of lithium battery explosion. The thin-walled pressure relief hole 24 is very close to the charging holes 41 and 53, and the pressure relief path is short.

[0042] The implementation principle of the present application is as follows: the present application sets a rolling groove 51 and a spinning edge 52 on the metal shell 5, limits the wound battery cell assembly 3 to the inner bottom of the metal shell 5, and limits the plastic middle frame 2 between the rolling groove 51 and the spinning edge 52. The metal shell 5 is a whole, has good strength, and has a good fixing effect on the wound battery cell assembly 3 and the plastic middle frame 2. No welding is required, and the processing difficulty and cost of the rolling groove 51 and the spinning edge 52 are lower than welding. The PCB board 1 is clamped in the plastic middle frame 2, and the PCB board 1 cannot be easily removed from the plastic middle frame 2, which plays a fixing role, can protect the PCB board 1, and prevent the PCB board 1 from being compressed when processing the spinning edge 52. It can also be isolated from the metal shell 5 and will not short-circuit.

[0043] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A 1.5V lithium battery with a charging interface, characterized in that: The invention comprises a PCB board (1), a plastic middle frame (2), a wound cell assembly (3), an insulating outer skin (4) and a metal shell (5); the upper side of the metal shell (5) is provided with a rolling groove (51), and the top is provided with a spinning edge (52); the wound cell assembly (3) is limited to the bottom of the inner side of the metal shell (5) by the rolling groove (51); the plastic middle frame (2) is located inside the metal shell (5) and is limited between the rolling groove (51) and the spinning edge (52); the PCB board (1) is clamped in the plastic middle frame (2); the upper side of the PCB board (1) is provided with a rolling groove (51 ... A positive electrode cap (11) is provided on the surface, a charging interface (12) and a positive electrode adapter (13) are provided on the lower surface, a common negative electrode (14) is provided on the upper surface of the PCB board (1), the common negative electrode (14) is electrically connected to the metal shell (5), the positive electrode tab (31) of the wound battery cell assembly (3) is electrically connected to the positive electrode adapter (13), and the negative electrode tab (32) is electrically connected to the metal shell (5), the insulating outer skin (4) is coated on the outside of the metal shell (5), and a charging hole is provided at the same position of the insulating outer skin (4) and the metal shell (5).

2. The 1.5V lithium battery with a charging interface according to claim 1, characterized in that: A through hole (21) is provided in the middle of the bottom wall of the plastic middle frame (2), and the positive electrode adapter (13) passes downward through the through hole (21), is bent, and is connected to the positive electrode ear (31) by spot welding, and a potting glue (6) is provided at the through hole (21) to form a seal to isolate the electrolyte.

3. The 1.5V lithium battery with a charging interface according to claim 1, characterized in that: A negative electrode spring (15) is also soldered to the common negative electrode (14) on the PCB board (1), and the PCB board (1) is electrically connected to the metal shell (5) via the negative electrode spring (15).

4. The 1.5V lithium battery with a charging interface according to claim 3, characterized in that: The negative electrode spring sheet (15) comprises a substrate (151) and a plurality of lift pieces (152) arranged on the outer edge of the substrate (151); the back of the substrate (151) is welded to the common negative electrode (14) by patch welding; and the lift pieces (152) are elastically abutted against the spun edge (52) of the metal shell (5).

5. The 1.5V lithium battery with a charging interface according to claim 1, characterized in that: A positive and negative electrode separator (7) is also pasted above the spun edge (52), and the outer portion of the positive and negative electrode separator (7) is wrapped by an insulating outer skin (4). A PCB board separator (18) is also provided between the PCB board (1) and the spun edge (52) to prevent short circuits between electronic components or solder joints on the PCB board (1) and the spun edge (52).

6. The 1.5V lithium battery with a charging interface according to claim 1, characterized in that: The interior of the plastic middle frame (2) is provided with a housing cavity (23) for the PCB board (1), and a plurality of buckles (22) are dispersedly provided on the inner wall of the upper end, and the buckles (22) confine the PCB board (1) in the housing cavity (23).

7. The 1.5V lithium battery with a charging interface according to claim 1, characterized in that: The positive electrode cap (11) is soldered on the PCB board (1) by patch welding, and part of the electronic components (16) on the PCB board (1) are placed inside the positive electrode cap (11).

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

9. The 1.5V lithium battery with a charging interface according to claim 1, characterized in that: The PCB board (1) is also provided with a charging indicator light (17), the insulating outer skin (4) and the metal shell (5) are provided with a light-transmitting hole at the same position, and the plastic middle frame (2) is made of a transparent material.

10. The 1.5V lithium battery with a charging interface according to claim 1, characterized in that: A thin-walled pressure relief hole (24) is also provided on the bottom wall of the plastic middle frame (2), and the thin-walled pressure relief hole (24) is located below the charging interface (12).

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