Rechargeable lithium battery without charging port and manufacturing method thereof

Abstract

The invention discloses a rechargeable lithium battery without a charging port and a manufacturing method thereof, and relates to the technical field of lithium batteries, and the lithium battery comprises a first negative electrode metal shell, a voltage regulating circuit board, a low-voltage positive electrode cap, a high-voltage positive electrode connecting piece, a lithium cell, a low-voltage positive electrode and negative electrode insulating spacer and an insulating shell. The upper end of the first negative electrode metal shell is inwards provided with a first flange, the upper surface of the voltage regulating circuit board is provided with a negative electrode copper ring and a positive electrode copper ring, the voltage regulating circuit board is welded on the inner side of the first flange on the first negative electrode metal shell through the negative electrode copper ring, and the high-voltage positive electrode connecting piece is arranged on the inner surface of the voltage regulating circuit board. The lithium battery can stably output low voltage, the voltage regulating circuit board is welded to the inner side of the first flange, the electrical connection performance is very reliable, and sealing is achieved through welding flux; an insulating support does not need to be arranged below the voltage regulating circuit board for supporting, the insulating support is omitted, the height space occupied by the voltage regulating circuit board is compressed, and the capacity of the lithium battery core is improved by lengthening the length of the lithium battery core.

Description

Technical Field

[0001] The present application relates to the technical field of lithium batteries, and in particular to a rechargeable lithium battery without a charging port and a manufacturing method thereof. Background Art

[0002] Rechargeable lithium batteries have many advantages, such as high energy density, no memory effect and fast charging capability, making them the preferred power source in modern electronic devices, electric vehicles and other applications.

[0003] The existing rechargeable No. 5 or No. 7 lithium batteries, if they are versions with a charging port, are convenient in that they can be directly plugged in for charging, but at the same time, the existence of the charging port also causes insufficient battery stability, and the overall waterproofness is not as good as that of the version without a charging port; and although the version without an opening is completely isolated from the outside world and has high stability and good waterproofness, since the original positive and negative electrodes of the lithium battery can be used for charging, the structure of the non-cell part inside the battery is more complicated, and more space originally belonging to the battery cell is required, resulting in a reduction in the proportion of the truly useful battery cell part in the capacity of the No. 5 or No. 7 battery of the same limited size. Therefore, the capacity of the rechargeable battery without a charging port is smaller than that of an ordinary rechargeable battery, and needs to be improved. Summary of the invention

[0004] In order to reduce the volume proportion of the non-cell part of a rechargeable lithium battery without a charging port and increase the capacity of the rechargeable lithium battery without a charging port, the present application provides a rechargeable lithium battery without a charging port and a manufacturing method thereof.

[0005] In the first aspect, the invention objective of the present application is achieved by adopting the following technical solutions: A rechargeable lithium battery without a charging port comprises: a first negative metal shell, a voltage regulating circuit board, a low-voltage positive cap, a high-voltage positive connector, a lithium battery cell and a low-voltage positive and negative insulating separator; a first flange is provided inwardly at the upper end of the first negative metal shell, a negative copper ring and a positive copper ring are provided on the upper surface of the voltage regulating circuit board, the voltage regulating circuit board is welded to the inner side of the first flange on the first negative metal shell through the negative copper ring, and the voltage regulating circuit board is provided with a rechargeable circuit without a charging port; the low-voltage positive cap is welded on the positive copper ring, the high-voltage positive connector is arranged on the inner surface of the voltage regulating circuit board, the lithium battery cell comprises a second negative metal shell and a high-voltage positive cap assembly, the first negative metal shell and the second negative metal shell are electrically connected by docking or sleeve connection, and the high-voltage positive connector is in elastic contact with the high-voltage positive cap assembly; the low-voltage positive and negative insulating separators are arranged above the first flange of the first negative metal shell.

[0006] By adopting the above technical scheme, a rechargeable lithium battery product without a charging port is provided, which has tighter fit between the components of the lithium battery, a compact size and a higher capacity. The low-voltage positive electrode cap of the present application serves as the positive electrode of the battery, and the second negative electrode metal shell of the lithium battery cell serves as the negative electrode of the battery, which can stably output a low voltage of 1.5V or other specific low voltages. Different from the negative electrode connection method of the prior art that uses elastic ejector pins to connect the voltage regulating circuit board and the second negative electrode metal shell, the present application directly provides a positive copper ring on the upper surface and a negative copper ring at the same time, and then welds the voltage regulating circuit board to the inner side of the first flange of the first negative electrode metal shell by welding, so that the voltage regulating circuit board is electrically connected to the second negative electrode metal shell through the first negative electrode metal shell in turn, that is, to the negative electrode of the lithium battery cell. The negative electrode electrical connection not only improves the electrical connection performance between the voltage regulating circuit board and the first negative electrode metal shell, but also completely eliminates the technical problem of poor contact. At the same time, there will be no gap between the first negative electrode metal shell and the voltage regulating circuit board, and there is no need to apply glue. The sealing effect can be achieved through solder to achieve a waterproof and dustproof effect. Secondly, the voltage regulating circuit board is fixed very firmly. Furthermore, there is no need to set an insulating bracket under the voltage regulating circuit board for support, which saves the insulating bracket, reduces the number of parts, and does not need to arrange the steps of assembling the insulating bracket. More importantly, the height space occupied by the voltage regulating circuit board is extremely compressed, and the space originally belonging to the insulating bracket can be filled by lengthening the length of the lithium battery cell, which is conducive to achieving the technical goal of further increasing the capacity of the lithium battery cell.

[0007] In a preferred example of the present application: the lithium battery cell also includes a wound battery cell assembly, the wound battery cell assembly includes a wound battery cell, a battery positive electrode ear and a battery negative electrode ear, the wound battery cell is welded to the high-voltage positive electrode cap assembly through the battery positive electrode ear, and the battery negative electrode ear is wound from the side of the wound battery cell to the bottom surface and connected to the wound battery cell; the rechargeable circuit without a charging port is provided with a step-down charging management module and a battery protection module, the step-down charging management module is connected to the battery protection module, the battery voltage input terminal of the step-down charging management module is connected to the wound battery cell, and the output power terminal of the step-down charging management module is connected to the battery positive electrode ear; the power terminal of the battery protection module is connected to the battery positive electrode ear and the battery negative electrode ear, and the battery voltage input terminal of the battery protection module is connected to the wound battery cell.

[0008] In a preferred example of the present application: the buck charging management module includes a buck charging management chip and a filter circuit unit, the battery voltage input pin of the buck charging management chip is connected to the positive pole of the wound battery cell, and the filter circuit unit includes a first filter capacitor, a second filter capacitor and a first inductor; the battery voltage input pin of the buck charging management chip is connected in series with the first filter capacitor and then grounded, the SW pin of the buck charging management chip is connected in series with the first inductor and the second filter capacitor in sequence and then grounded, and the VOUT pin of the buck charging management chip is connected to the SW pin through the first inductor.

[0009] In a preferred example of the present application: the model of the step-down charging management chip is IP5167.

[0010] In a preferred example of the present application: the battery protection module includes a battery protection chip and a protection filter capacitor; the battery voltage input pin of the battery protection chip is connected to the wound battery cell and the step-down charging management module; the VDD pin of the battery protection chip is connected to the positive electrode ear of the battery; the VCC pin of the battery protection chip is connected in series with the protection filter capacitor and connected to the negative electrode ear of the battery.

[0011] In a preferred example of the present application: the model of the battery protection chip is BP6452LC.

[0012] In a preferred example of the present application: the lithium battery cell also includes a wound battery cell assembly, the upper part of the second negative metal shell is provided with an annular rolling groove, and the top is provided with a second flange, the wound battery cell assembly is arranged in the second negative metal shell, and the position is limited by the annular rolling groove, the second negative metal shell is divided into a main body portion below and a contraction portion above by the annular rolling groove, the outer diameter of the first negative metal shell is the same as the outer diameter of the main body of the second negative metal shell, the inner diameter of the first negative metal shell is the same as the outer diameter of the contraction portion of the second negative metal shell, the contraction portion of the second negative metal shell is embedded in the first negative metal shell, and the outer surfaces of the first negative metal shell and the second negative metal shell are flush.

[0013] In a preferred example of the present application: the high-voltage positive electrode connector is an elastic ejector pin, a conical spring or a spring.

[0014] In a preferred example, the present application further includes an insulating shell, which is coated on the first negative electrode metal shell, the second negative electrode metal shell and the low-voltage positive and negative electrode insulating separators.

[0015] In the second aspect, the invention objective of the present application is achieved by adopting the following technical solutions: A method for manufacturing a rechargeable lithium battery without a charging port as described above, the manufacturing method comprising: Making a first negative electrode metal shell, and forming a first flange on the top of the first negative electrode metal shell; Welding a voltage regulating circuit board with a rechargeable circuit without a charging port burned in it to the inner side of the first flange of the first negative electrode metal shell; Connecting the second negative electrode metal shell of the lithium battery cell to the first negative electrode metal shell, or embedding the second negative electrode metal shell into the first negative electrode metal shell, and then welding and fixing them; Place or stick a low-voltage positive and negative electrode insulating separator on the outer side of the first flange of the first negative electrode metal shell; Put on the insulating shell, heat and shrink it, so that the insulating shell wraps around the low-voltage positive and negative electrode insulating isolation sheets, the first negative electrode metal shell and the lithium battery cell to adjust the voltage.

[0016] In summary, the present application includes at least one of the following beneficial technical effects: 1. Provide a rechargeable lithium battery product without a charging port, which has tighter fit between various components of the lithium battery, a compact size and a higher capacity. Different from the connection method of using elastic connectors (such as elastic ejector pins) to connect the circuit board and the negative metal shell in the prior art, no insulating bracket is required to support the voltage regulating circuit board, which saves the insulating bracket, reduces the number of parts, and does not need to arrange the steps of assembling the insulating bracket. More importantly, the height space occupied by the voltage regulating circuit board is extremely compressed, which is conducive to increasing the capacity of the lithium battery cell; 2. The rechargeable lithium battery without charging port realizes efficient, safe and reliable battery management and protection functions through the carefully designed step-down charging management module and battery protection module, while optimizing space utilization and design complexity; the IP5167 step-down charging management chip is used to realize efficient management of battery voltage. IP5167 can not only provide accurate constant current and constant voltage charging modes, but also ensure the safety of the charging process and prevent the risks caused by overcharging and overheating; 3. The battery protection chip cooperates with the protection filter capacitor to provide comprehensive battery protection functions, including but not limited to overcharge, over discharge, over current and short circuit protection BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 It is an overall installation structure diagram and assembly diagram of a rechargeable lithium battery without a charging port in one embodiment of the present application; Figure 2 This is a cross-sectional view of the overall structure of a rechargeable lithium battery without a charging port in one embodiment of the present application; Figure 3 yes Figure 2 A partial enlarged view of middle A; Figure 4It is a schematic diagram of the disassembly and assembly of a first negative electrode metal shell, a voltage regulating circuit board, a low-voltage positive electrode cap, a high-voltage positive electrode connector, and a low-voltage positive and negative electrode insulating spacer in a rechargeable lithium battery without a charging port in one embodiment of the present application; Figure 5 This is a schematic diagram of the structural assembly of a lithium battery cell in a rechargeable lithium battery without a charging port in one embodiment of the present application; Figure 6 It is a circuit diagram of a step-down charging management module and a battery protection module in a voltage regulating circuit board in a rechargeable lithium battery without a charging port in one embodiment of the present application.

[0017] Description of reference numerals: 1. First negative electrode metal shell; 11. First flange; 2. Voltage regulating circuit board; 21. Negative electrode copper ring; 22. Positive electrode copper ring; 23. Step-down charging management module; 24. Battery protection module; 3. Low-voltage positive electrode cap; 4. High-voltage positive electrode connector; 5. Lithium battery cell; 51. Second negative electrode metal shell; 511. Annular rolling groove; 512. Second flange; 52. High-voltage positive electrode cap assembly; 53. Wound battery cell assembly; 531. Wound battery cell; 532. Battery positive electrode ear; 533. Battery negative electrode ear; 534. Upper diaphragm; 535. Lower diaphragm; 6. Low-voltage positive and negative electrode insulating spacers; 7. Insulating shell; 8. High-voltage positive and negative electrode insulating spacers. DETAILED DESCRIPTION

[0018] The following is combined with Figure 1-6 This application is described in further detail.

[0019] In one embodiment, if Figures 1 to 5 As shown, the present application discloses a rechargeable lithium battery without a charging port, specifically an AA battery (No. 5 battery) or an AAA battery (No. 7 battery); the rechargeable lithium battery without a charging port includes a first negative electrode metal shell 1, a voltage regulating circuit board 2, a low-voltage positive electrode cap 3, a high-voltage positive electrode connector 4, a lithium battery cell 5, a low-voltage positive and negative electrode insulating isolation sheet 6 and an insulating shell 7.

[0020] like Figures 2 to 4As shown, a first flange 11 is provided inwardly at the upper end of the first negative metal shell 1, a negative copper ring 21 and a positive copper ring 22 are provided on the upper surface of the voltage regulating circuit board 2, the voltage regulating circuit board 2 is welded to the inner side of the first flange 11 on the first negative metal shell 1 through the negative copper ring 21, and the voltage regulating circuit board 2 is provided with a rechargeable circuit without a charging port; the low-voltage positive cap 3 is welded on the positive copper ring 22, and the high-voltage positive connector 4 is arranged on the inner surface of the voltage regulating circuit board 2; the lithium battery cell 5 includes a second negative metal shell 51 and a high-voltage positive cap assembly 52, the first negative metal shell 1 and the second negative metal shell 51 are electrically connected by docking or sleeve connection, and the high-voltage positive connector 4 is in elastic contact with the high-voltage positive cap assembly 52; the low-voltage positive and negative insulating separators 6 are arranged above the first flange 11 of the first negative metal shell 1, and the insulating outer skin is coated on the first negative metal shell 1, the second negative metal shell 51 and the low-voltage positive and negative insulating separators 6.

[0021] like Figure 3 and Figure 4 As shown, the high-voltage positive electrode connector 4 is an elastic ejector pin. In this embodiment, the high-voltage positive electrode connector 4 can also be an elastic structure such as a conical spring or a spring sheet, which can play the same role of elastic contact and conduction.

[0022] like Figures 2 to 5As shown, the lithium battery cell 5 also includes a wound battery cell assembly 53, and the lithium battery cell 5 also includes a wound battery cell assembly 53, and the wound battery cell assembly 53 includes a wound battery cell 531, a battery positive electrode ear 532, a battery negative electrode ear 533, an upper diaphragm 534 and a lower diaphragm 535. The wound battery cell 531 is welded to the high-voltage positive electrode cap assembly 52 through the battery positive electrode ear 532, and the battery negative electrode ear 533 is wound from the side of the wound battery cell 531 to the bottom surface and connected to the wound battery cell 531. Specifically, the battery positive electrode ear 532 passes through the central hole of the upper diaphragm 534 and is welded to the lower end of the high-voltage positive electrode cap assembly 52, and the battery negative electrode ear 533 is welded to the bottom surface of the lower diaphragm 535. The upper diaphragm 534 and the lower diaphragm 535 can provide short-circuit protection for the lithium battery cell 5. Protection; The second negative metal shell 51 is provided with an annular rolling groove 511 on the upper part, and a second flange 512 on the top. The wound cell assembly 53 is arranged in the second negative metal shell 51 and is limited in position by the annular rolling groove 511. The second negative metal shell 51 is divided into a main body below and a contraction part above by the annular rolling groove 511. The outer diameter of the first negative metal shell 1 is the same as the outer diameter of the main body of the second negative metal shell 51. The inner diameter of the first negative metal shell 1 is the same as the outer diameter of the contraction part of the second negative metal shell 51. The contraction part of the second negative metal shell 51 is embedded in the first negative metal shell 1. The outer surfaces of the first negative metal shell 1 and the second negative metal shell 51 are flush, so that the outer diameter of the entire lithium battery is consistent and no steps are generated. In this embodiment, a high-voltage positive and negative insulating separator 8 is pasted on the second flange 512 on the top of the second negative metal shell 51 to ensure electrical safety.

[0023] like Figure 6 As shown, Figure 6 Taking the circuit diagram shown as an example, the voltage regulating circuit board 2 is provided with a step-down charging management module 23 and a battery protection module 24. The step-down charging management module 23 is connected to the battery protection module 24. The battery voltage input terminal of the step-down charging management module 23 is connected to the wound battery cell 531, and the output power supply terminal of the step-down charging management module 23 is connected to the battery positive ear 532; the power supply terminal of the battery protection module 24 is connected to the battery positive ear 532 and the battery negative ear 533, and the battery voltage input terminal of the battery protection module 24 is connected to the wound battery cell 531.

[0024] like Figure 6As shown, the buck charging management module 23 includes a buck charging management chip U1 and a filter circuit unit. The model of the buck charging management chip U1 is IP5167. The battery voltage input pin of the buck charging management chip U1 is connected to the positive electrode of the wound battery cell 531. The filter circuit unit includes a first filter capacitor C1, a second filter capacitor C2 and a first inductor L1; the battery voltage input pin of the buck charging management chip U1 is connected in series with the first filter capacitor C1 and then grounded, the SW pin of the buck charging management chip U1 is connected in series with the first inductor L1 and the second filter capacitor C2 in sequence and then grounded, and the VOUT pin of the buck charging management chip U1 is connected to the SW pin through the first inductor L1. When the buck charging management chip U1 controls the charging of the lithium battery, the current flowing to the battery through the inductor (the first inductor L1 in this embodiment) is changed by adjusting the PWM signal on the SW pin. In the discharge state, the operation of the SW pin allows current to flow from the battery to the external load while maintaining the stability of the output voltage.

[0025] Furthermore, if Figure 6 As shown, the NTC pin of the buck charging management chip U1 is also connected to an external NTC thermistor for detecting the battery temperature. When the temperature is detected to be beyond the preset safety range, IP5167 can take measures to limit the charging current, stop charging or cut off the output to avoid potential hazards; the SW pin is the switching node of the buck charging management chip U1, which involves the switching of current during charging and discharging. The present application also connects a TVS diode to the SW pin to provide overvoltage protection for the lithium battery. During normal operation, the TVS diode is in a non-conducting state and will not affect the function of the SW pin, but when the voltage on the SW pin exceeds the preset safety threshold, the TVS diode starts immediately to clamp the voltage at a safe level and quickly releases excess energy to the ground.

[0026] like Figure 6 As shown, the battery protection module 24 includes a battery protection chip U2 and a protection filter capacitor C4. The model of the battery protection chip U2 is BP6452LC. The battery voltage input pin of the battery protection chip U2 is connected to the wound battery cell 531 and the buck charging management module 23. The VDD pin of the battery protection chip U2 is connected to the battery positive electrode ear 532. The VCC pin of the battery protection chip U2 is connected in series with the protection filter capacitor C4 and connected to the battery negative electrode ear 533.

[0027] The implementation principle of the rechargeable lithium battery without a charging port in the present application is as follows: unlike the elastic ejector pin in the prior art to connect the voltage regulating circuit board 2 and the second negative metal shell 51, a negative copper ring 21 is arranged on the upper surface of the voltage regulating circuit board 2, and the voltage regulating circuit board 2 is welded to the inner side of the first flange 11 of the first negative metal shell 1 by welding, so that the voltage regulating circuit board 2 is electrically connected to the second negative metal shell 51 through the first negative metal shell 1 in turn, that is, it is electrically connected to the negative electrode of the lithium battery cell 5. Due to the welding method, firstly, the electrical connection performance between the voltage regulating circuit board 2 and the first negative metal shell 1 is very reliable, and there is no contact insufficiency at all. Secondly, there will be no gap between the first negative electrode metal shell 1 and the voltage regulating circuit board 2, and there is no need to apply glue, and the sealing effect can be achieved by soldering; thirdly, the voltage regulating circuit board 2 is fixed very firmly, and there is no need to set an insulating bracket underneath for support, which saves the insulating bracket, reduces the number of parts, and does not need to arrange the steps of assembling the insulating bracket. More importantly, the height space occupied by the voltage regulating circuit board 2 is extremely compressed, and the space originally belonging to the insulating bracket can be filled by lengthening the length of the lithium battery cell 5, so that the capacity of the lithium battery cell 5 can be further increased, thereby making the lithium battery have a larger capacity.

[0028] In another embodiment, referring to Figures 1 to 5 The present application discloses a method for manufacturing a rechargeable lithium battery without a charging port, the manufacturing method comprising the following steps: S0.1, placing the wound battery cell assembly 53 into the second negative electrode metal shell 51, and making an annular rolling groove 511 on the upper part of the second negative electrode metal shell 51; S0.2, welding the negative electrode tab of the wound battery cell assembly 53 to the bottom wall of the second negative electrode metal shell 51, and welding the positive electrode tab to the high-voltage positive electrode cap assembly 52; S0.3, inject electrolyte; S0.4, placing the high-voltage positive electrode cap assembly 52 into the second negative electrode metal shell 51, and making a contraction portion on the upper part of the second negative electrode metal shell 51; S0.5, making a second flange 512 on the upper edge of the second negative electrode metal shell 51, fixing the high-voltage positive electrode cap assembly 52 in the contraction portion, and forming a lithium battery cell 5; S0.5, performing a capacity-shaping process on the lithium battery cell 5.

[0029] The first negative metal shell 1 and the second negative metal shell 51 are fixedly connected by spot welding or circumferential welding. The lower edge of the first negative metal shell 1 can also be contracted inward to form a contraction to define the contraction portion of the second negative metal shell 51.

[0030] The manufacturing method of the rechargeable lithium battery without a charging port described in this embodiment comprises the following steps: S1, manufacturing a first negative electrode metal shell 1, and forming a first flange 11 on the top of the first negative electrode metal shell 1; S2, welding the voltage regulating circuit board 2 to the inner side of the first flange 11 of the first negative electrode metal shell 1; S3, embed the second negative metal shell 51 into the first negative metal shell 1, and then weld and fix it; because the second negative metal shell 51 in this embodiment is provided with a contraction portion at the upper end, the first negative metal shell 1 can just fit into the contraction portion to ensure contact and conduction, and spot welding or circumferential welding can completely fix the first negative metal shell 1 and the second negative metal shell 51; if the second negative metal shell 51 is not provided with a contraction portion at the upper end, then it is necessary to butt the second negative metal shell 51 of the lithium battery 5 with the first negative metal shell 1, and then weld and fix them; S4, placing or sticking a low-voltage positive and negative electrode insulating separator 6 on the outer side of the first flange 11 of the first negative electrode metal shell 1; S5, putting on the insulating outer skin, heating and shrinking it, so that the insulating outer skin is wrapped around the low-voltage positive and negative electrode insulating isolation sheets 6, the first negative electrode metal shell 1 and the lithium battery cell 5.

[0031] In order to better isolate the voltage regulating circuit board 2 and the lithium battery cell 5 to prevent accidental short circuit between the two and ensure electrical safety, between steps S2 and S3, there is also a step of pasting the high-voltage positive and negative electrode insulating isolation sheets 8 to the second flange 512 of the lithium battery cell 5.

[0032] The manufacturing method described in the present application has reasonable procedures, high yield rate, can be industrialized, and is particularly suitable for large-scale production.

[0033] In this embodiment, in step S2, the voltage regulating circuit board 2 may be welded to the inner side of the first flange 11 of the first negative electrode metal shell 1 by using a hot pressing tin melting welding process or a furnace welding process.

[0034] The manufacturing method of this embodiment has reasonable procedures, high yield rate, and can further improve the capacity of the lithium battery cell, and is particularly suitable for large-scale industrial production.

[0035] The embodiments described above are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, it should be understood by those skilled in the art that the technical solutions described in the aforementioned embodiments may still be modified, or some of the features thereof may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A rechargeable lithium battery without a charging port, characterized in that: include: A first negative metal shell, a voltage regulating circuit board, a low-voltage positive electrode cap, a high-voltage positive electrode connector, a lithium battery cell and a low-voltage positive and negative electrode insulating separator; a first flange is provided inwardly at the upper end of the first negative metal shell, a negative copper ring and a positive copper ring are provided on the upper surface of the voltage regulating circuit board, the voltage regulating circuit board is welded to the inner side of the first flange on the first negative metal shell through the negative copper ring, and the voltage regulating circuit board is provided with a rechargeable circuit without a charging port; the low-voltage positive electrode cap is welded on the positive copper ring, the high-voltage positive electrode connector is arranged on the inner surface of the voltage regulating circuit board, the lithium battery cell includes a second negative metal shell and a high-voltage positive electrode cap assembly, the first negative metal shell and the second negative metal shell are electrically connected by docking or sleeve connection, and the high-voltage positive electrode connector is in elastic contact with the high-voltage positive electrode cap assembly; the low-voltage positive and negative electrode insulating separator is arranged above the first flange of the first negative metal shell.

2. A rechargeable lithium battery without a charging port according to claim 1, characterized in that: The lithium battery cell also includes a wound battery cell assembly, which includes a wound battery cell, a battery positive electrode ear and a battery negative electrode ear. The wound battery cell is welded to the high-voltage positive electrode cap assembly through the battery positive electrode ear, and the battery negative electrode ear is wound from the side of the wound battery cell to the bottom surface and connected to the wound battery cell; the rechargeable circuit without a charging port is provided with a step-down charging management module and a battery protection module, the step-down charging management module is connected to the battery protection module, the battery voltage input terminal of the step-down charging management module is connected to the wound battery cell, and the output power supply terminal of the step-down charging management module is connected to the battery positive electrode ear; the power supply terminal of the battery protection module is connected to the battery positive electrode ear and the battery negative electrode ear, and the battery voltage input terminal of the battery protection module is connected to the wound battery cell.

3. A rechargeable lithium battery without a charging port according to claim 2, characterized in that: The buck charging management module includes a buck charging management chip and a filter circuit unit, the battery voltage input pin of the buck charging management chip is connected to the positive pole of the wound battery cell, and the filter circuit unit includes a first filter capacitor, a second filter capacitor and a first inductor; the battery voltage input pin of the buck charging management chip is connected in series with the first filter capacitor and then grounded, the SW pin of the buck charging management chip is connected in series with the first inductor and the second filter capacitor in sequence and then grounded, and the VOUT pin of the buck charging management chip is connected to the SW pin through the first inductor.

4. A rechargeable lithium battery without a charging port according to claim 3, characterized in that: The model of the step-down charging management chip is IP5167.

5. A rechargeable lithium battery without a charging port according to claim 2, characterized in that: The battery protection module includes a battery protection chip and a protection filter capacitor; the battery voltage input pin of the battery protection chip is connected to the wound battery cell and the step-down charging management module; the VDD pin of the battery protection chip is connected to the positive electrode ear of the battery; the VCC pin of the battery protection chip is connected in series with the protection filter capacitor and connected to the negative electrode ear of the battery.

6. A rechargeable lithium battery without a charging port according to claim 5, characterized in that: The model of the battery protection chip is BP6452LC.

7. A rechargeable lithium battery without a charging port according to claim 2, characterized in that: The lithium battery cell also includes a wound battery cell assembly, an annular rolling groove is provided on the upper part of the second negative metal shell, and a second flange is provided on the top, the wound battery cell assembly is arranged in the second negative metal shell, and the position is limited by the annular rolling groove, the second negative metal shell is divided into a main body portion below and a contraction portion above by the annular rolling groove, the outer diameter of the first negative metal shell is the same as the outer diameter of the main body portion of the second negative metal shell, the inner diameter of the first negative metal shell is the same as the outer diameter of the contraction portion of the second negative metal shell, the contraction portion of the second negative metal shell is embedded in the first negative metal shell, and the outer surfaces of the first negative metal shell and the second negative metal shell are flush.

8. The rechargeable lithium battery without a charging port according to claim 2, characterized in that: The high-voltage positive electrode connector is an elastic ejector pin, a conical spring or a spring.

9. A rechargeable lithium battery without a charging port according to claim 1, characterized in that: It also includes an insulating shell, which is coated outside the first negative electrode metal shell, the second negative electrode metal shell and the low-voltage positive and negative electrode insulating isolation sheets.

10. A method for manufacturing a rechargeable lithium battery without a charging port as claimed in any one of claims 1 to 9, characterized in that: The manufacturing method comprises: Making a first negative electrode metal shell, and forming a first flange on the top of the first negative electrode metal shell; Welding a voltage regulating circuit board with a rechargeable circuit without a charging port burned in it to the inner side of the first flange of the first negative electrode metal shell; Connecting the second negative electrode metal shell of the lithium battery cell to the first negative electrode metal shell, or embedding the second negative electrode metal shell into the first negative electrode metal shell, and then welding and fixing them; Place or stick a low-voltage positive and negative electrode insulating separator on the outer side of the first flange of the first negative electrode metal shell; Put on the insulating shell, heat and shrink it, so that the insulating shell wraps around the low-voltage positive and negative electrode insulating isolation sheets, the first negative electrode metal shell and the lithium battery core.

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