Charging-port-free rechargeable lithium battery and manufacturing method therefor

Abstract

The present application relates to the technical field of lithium batteries. Disclosed are a charging-port-free rechargeable lithium battery and a manufacturing method therefor. The lithium battery comprises a first negative metal housing, a voltage adjustment circuit board, a low-voltage positive cap, a high-voltage positive connector, a lithium battery cell, a low-voltage positive and negative insulating separator and an insulating housing. A first flange is provided inwards at the upper end of the first negative metal housing; a negative copper ring and a positive copper ring are provided on the upper surface of the voltage adjustment circuit board; the voltage adjustment circuit board is welded to the inner side of the first flange on the first negative metal housing by means of the negative copper ring; and the high-voltage positive connector is arranged on the inner surface of the voltage adjustment circuit board. The lithium battery in the present application can stably output a low voltage, and the voltage adjustment circuit board is welded to the inner side of the first flange, such that the electrical connection performance is very reliable, and sealing is achieved by means of solder; there is no need to provide an insulating support below the voltage adjustment circuit board for support, thereby omitting the insulating support, and reducing a height space occupied by the voltage adjustment circuit board; and the capacity of the lithium battery cell is increased by means of lengthening the lithium battery cell.

Description

A rechargeable lithium battery without a charging port and its manufacturing method Technical Field

[0001] This application relates to the field of lithium battery technology, and in particular to a rechargeable lithium battery without a charging port and a method for manufacturing the same. Background Technology

[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 for modern electronic devices, electric vehicles, and other applications.

[0003] Existing rechargeable AA or AAA lithium batteries with charging ports offer the advantage of direct plug-in charging, but the presence of the charging port also leads to insufficient battery stability and lower overall waterproofing compared to versions without charging ports. While versions without charging ports offer high stability and good waterproofing due to complete isolation from the outside world, the original positive and negative terminals of the lithium battery, which can be used for charging, make the internal non-cell structure more complex, requiring more space that would otherwise belong to the battery cells. Consequently, the proportion of truly usable battery cells in the capacity of a AA or AAA battery of the same size is reduced, resulting in a smaller capacity for rechargeable batteries without charging ports compared to ordinary rechargeable batteries, which needs improvement. Summary of the Invention

[0004] In order to reduce the volume ratio of non-cell parts in a rechargeable lithium battery without a charging port and increase its capacity, this application provides a rechargeable lithium battery without a charging port and a method for manufacturing the same.

[0005] Firstly, the objective of this invention is achieved through the following technical solution:

[0006] A rechargeable lithium battery without a charging port includes: a first negative electrode metal casing, a voltage regulating circuit board, a low-voltage positive electrode cap, a high-voltage positive electrode connector, a lithium battery cell, and low-voltage positive and negative electrode insulating sheets; the first negative electrode metal casing has a first flange extending inward at its upper end; the voltage regulating circuit board has a negative electrode copper ring and a positive electrode copper ring on its upper surface; the voltage regulating circuit board is welded to the inner side of the first flange on the first negative electrode metal casing via the negative electrode copper ring; the voltage regulating circuit board has a rechargeable circuit without a charging port; the low-voltage positive electrode cap is welded to the positive electrode copper ring; the high-voltage positive electrode connector is disposed on the inner surface of the voltage regulating circuit board; the lithium battery cell includes a second negative electrode metal casing and a high-voltage positive electrode cap assembly; the first negative electrode metal casing and the second negative electrode metal casing are electrically connected by butt joint or sleeve connection; 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 sheets are disposed above the first flange of the first negative electrode metal casing.

[0007] By adopting the above technical solution, a rechargeable lithium battery product without a charging port is provided, which features tighter integration between its components, a smaller size, and higher capacity. In this application, the low-voltage positive electrode cap serves as the positive electrode, and the second negative electrode metal casing of the lithium battery cell serves as the negative electrode, enabling a stable output of 1.5V low voltage or other specific low voltages. Unlike existing technologies that use elastic pins to connect the voltage regulating circuit board and the negative electrode connection of the second negative electrode metal casing, this application directly sets a positive electrode copper ring on the upper surface while simultaneously setting a negative electrode copper ring. The voltage regulating circuit board is then welded to the inner side of the first flange of the first negative electrode metal casing. Thus, the voltage regulating circuit board is electrically connected to the second negative electrode metal casing sequentially through the first negative electrode metal casing, i.e., to 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, completely eliminating the technical problem of poor contact, but also ensures that there are no gaps between the first negative electrode metal shell and the voltage regulating circuit board. No glue is needed; the sealing effect can be achieved through solder, achieving waterproof and dustproof effects. Secondly, the voltage regulating circuit board is very securely fixed. Furthermore, no insulating support is needed below the voltage regulating circuit board, eliminating the need for an insulating support, reducing the number of components, and eliminating the need for assembling the insulating support. More importantly, it drastically reduces the height space occupied by the voltage regulating circuit board. The space that was originally occupied by the insulating support can be filled by lengthening the lithium battery cell, which is conducive to further increasing the capacity of the lithium battery cell.

[0008] In a preferred embodiment of this application: the lithium battery cell further includes a wound cell assembly, the wound cell assembly including a wound cell, a positive electrode tab, and a negative electrode tab, the wound cell being welded to the high-voltage positive electrode cap assembly via the positive electrode tab, and the negative electrode tab being wound from the side of the wound cell to the bottom surface and connected to the wound cell; the rechargeable circuit without a charging port includes a buck charging management module and a battery protection module, the buck charging management module being connected to the battery protection module, the battery voltage input terminal of the buck charging management module being connected to the wound cell, and the output power terminal of the buck charging management module being connected to the positive electrode tab; the power terminal of the battery protection module is connected to the positive and negative electrode tabs, and the battery voltage input terminal of the battery protection module is connected to the wound cell.

[0009] In a preferred embodiment of this 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 terminal of the wound battery cell. 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 and then grounded. The VOUT pin of the buck charging management chip is connected to the SW pin through the first inductor.

[0010] In a preferred embodiment of this application, the buck charging management chip is model IP5167.

[0011] In a preferred embodiment of this 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 buck charging management module; the VDD pin of the battery protection chip is connected to the positive terminal 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 terminal of the battery.

[0012] In a preferred embodiment of this application, the battery protection chip is model BP6452LC.

[0013] In a preferred embodiment of this application: the lithium battery cell further includes a wound cell assembly; the upper part of the second negative electrode metal shell is provided with an annular groove, and the top is provided with a second flange; the wound cell assembly is disposed inside the second negative electrode metal shell and its position is defined by the annular groove; the second negative electrode metal shell is divided into a lower body portion and an upper constricted portion by the annular groove; the outer diameter of the first negative electrode metal shell and the outer diameter of the second negative electrode metal shell body portion are the same; the inner diameter of the first negative electrode metal shell and the outer diameter of the second negative electrode metal shell constricted portion are the same; the constricted portion of the second negative electrode metal shell is embedded inside the first negative electrode metal shell; the outer surfaces of the first negative electrode metal shell and the second negative electrode metal shell are flush.

[0014] In a preferred embodiment of this application, the high-voltage positive electrode connector is an elastic pin, a conical spring, or a spring sheet.

[0015] In a preferred embodiment, this application further includes an insulating housing that covers the first negative electrode metal housing, the second negative electrode metal housing, and the low-voltage positive and negative electrode insulating separators.

[0016] Secondly, the objective of this invention is achieved through the following technical solution:

[0017] A method for manufacturing a rechargeable lithium battery without a charging port as described above, the method comprising:

[0018] The first negative electrode metal casing is manufactured, and the first flange is formed on the top of the first negative electrode metal casing;

[0019] The voltage regulating circuit board with a rechargeable circuit without a charging port is soldered to the inside of the first flange of the first negative metal shell.

[0020] The second negative electrode metal shell of the lithium battery cell is connected to the first negative electrode metal shell, or the second negative electrode metal shell is embedded in the first negative electrode metal shell and then welded to fix it.

[0021] Place or attach low-voltage positive and negative electrode insulating sheets to the outside of the first flange of the first negative electrode metal casing;

[0022] An insulating shell is fitted over the battery and then heated to shrink it, so that the insulating shell wraps around the low-voltage positive and negative electrode insulating separator, the first negative electrode metal shell, and the lithium battery cell to regulate the voltage.

[0023] In summary, this application includes at least one of the following beneficial technical effects:

[0024] 1. This application provides a rechargeable lithium battery product without a charging port, which features tighter fit between the various components, smaller size, and higher capacity. Unlike the existing technology that uses elastic connectors (such as elastic pins) to connect the circuit board and the negative electrode metal shell, the voltage regulating circuit board in this application does not need to be supported by an insulating bracket. This eliminates the need for an insulating bracket, reduces the number of components, and eliminates the need for assembling the insulating bracket. More importantly, it greatly reduces the height space occupied by the voltage regulating circuit board, which is beneficial to increasing the capacity of the lithium battery cell.

[0025] 2. The rechargeable lithium battery without a charging port achieves efficient, safe, and reliable battery management and protection functions through a carefully designed buck charging management module and battery protection module, while optimizing space utilization and design complexity; it uses the IP5167 buck charging management chip to achieve efficient management of battery voltage. The IP5167 can not only provide precise constant current and constant voltage charging modes, but also ensure the safety of the charging process and prevent the risks of overcharging and overheating.

[0026] 3. The battery protection chip, together with the protection filter capacitor, provides comprehensive battery protection functions, including but not limited to overcharge, over-discharge, overcurrent and short circuit protection. Attached Figure Description

[0027] Figure 1 is an overall installation structure diagram and assembly diagram of a rechargeable lithium battery without a charging port according to an embodiment of this application;

[0028] Figure 2 is a cross-sectional view of the overall structure of a rechargeable lithium battery without a charging port according to an embodiment of this application.

[0029] Figure 3 is a magnified view of part A in Figure 2;

[0030] Figure 4 is a schematic diagram of the disassembly and assembly of the first negative electrode metal shell, voltage regulating circuit board, low-voltage positive electrode cap, high-voltage positive electrode connector and low-voltage positive and negative electrode insulating separator in a rechargeable lithium battery without a charging port according to an embodiment of this application.

[0031] Figure 5 is a schematic diagram of the structural assembly of a lithium cell in a rechargeable lithium battery without a charging port according to an embodiment of this application.

[0032] Figure 6 is a circuit diagram of a step-down charging management module and a battery protection module in a voltage regulating circuit board of a rechargeable lithium battery without a charging port according to an embodiment of this application.

[0033] Explanation of reference numerals in the attached drawings: 1. First negative electrode metal casing; 11. First flange; 2. Voltage regulating circuit board; 21. Negative electrode copper ring; 22. Positive electrode copper ring; 23. Buck 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 casing; 511. Annular groove; 512. Second flange; 52. High-voltage positive electrode cap assembly; 53. Winded cell assembly; 531. Winded cell; 532. Battery positive electrode tab; 533. Battery negative electrode tab; 534. Upper separator; 535. Lower separator; 6. Low-voltage positive and negative electrode insulating separator; 7. Insulating casing; 8. High-voltage positive and negative electrode insulating separator. Detailed Implementation

[0034] The present application will be further described in detail below with reference to Figures 1-6.

[0035] In one embodiment, as shown in Figures 1 to 6, this application discloses a rechargeable lithium battery without a charging port, specifically an AA battery (size 5 battery) or an AAA battery (size 7 battery); the rechargeable lithium battery without a charging port includes a first negative electrode metal casing 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, low-voltage positive and negative electrode insulating separators 6, and an insulating casing 7.

[0036] As shown in Figures 2 to 4, the upper end of the first negative electrode metal shell 1 is provided with a first flange 11. The upper surface of the voltage regulating circuit board 2 is provided with a negative electrode copper ring 21 and a positive electrode copper ring 22. The voltage regulating circuit board 2 is welded to the inner side of the first flange 11 on the first negative electrode metal shell 1 through the negative electrode copper ring 21. The voltage regulating circuit board 2 is provided with a rechargeable circuit without a charging port. The low-voltage positive electrode cap 3 is welded to the positive electrode copper ring 22. The high-voltage positive electrode connector 4 is provided on the inner surface of the voltage regulating circuit board 2. The lithium battery cell 5 includes a second negative electrode metal shell 51 and a high-voltage positive electrode cap assembly 52. ​​The first negative electrode metal shell 1 and the second negative electrode metal shell 51 are electrically connected by butt joint or sleeve connection. The high-voltage positive electrode connector 4 is in elastic contact with the high-voltage positive electrode cap assembly 52. ​​The low-voltage positive and negative electrode insulating isolation sheet 6 is provided above the first flange 11 of the first negative electrode metal shell 1. The insulating outer skin covers the first negative electrode metal shell 1, the second negative electrode metal shell 51 and the low-voltage positive and negative electrode insulating isolation sheet 6.

[0037] As shown in Figures 3 and 4, the high-voltage positive electrode connector 4 is an elastic 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 conduction.

[0038] As shown in Figures 2 to 5, the lithium battery cell 5 also includes a wound cell assembly 53. The wound cell assembly 53 includes a wound cell 531, a positive electrode tab 532, a negative electrode tab 533, an upper separator 534, and a lower separator 535. The wound cell 531 is welded to the high-voltage positive electrode cap assembly 52 via the positive electrode tab 532. The negative electrode tab 533 is wound from the side of the wound cell 531 to the bottom surface and connected to the wound cell 531. Specifically, the positive electrode tab 532 passes through the central hole of the upper separator 534 and is welded to the lower end of the high-voltage positive electrode cap assembly 52. ​​The negative electrode tab 533 is welded to the bottom surface of the lower separator 535. The upper separator 534 and the lower separator 535 can provide... Short circuit protection: The second negative electrode metal casing 51 has an annular groove 511 on its upper part and a second flange 512 on its top. The wound cell assembly 53 is disposed inside the second negative electrode metal casing 51 and its position is defined by the annular groove 511. The second negative electrode metal casing 51 is divided into a lower body part and an upper constricted part by the annular groove 511. The outer diameter of the first negative electrode metal casing 1 is the same as the outer diameter of the body part of the second negative electrode metal casing 51, and the inner diameter of the first negative electrode metal casing 1 is the same as the outer diameter of the constricted part of the second negative electrode metal casing 51. The constricted part of the second negative electrode metal casing 51 is embedded inside the first negative electrode metal casing 1. The outer surfaces of the first negative electrode metal casing 1 and the second negative electrode metal casing 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 electrode insulating separator 8 is attached to the second flange 512 on the top of the second negative electrode metal casing 51 to ensure electrical safety.

[0039] As shown in Figure 6, taking the circuit diagram shown in Figure 6 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 cell 531, and the output power terminal of the step-down charging management module 23 is connected to the positive electrode 532 of the battery. The power terminal of the battery protection module 24 is connected to the positive electrode 532 and the negative electrode 533 of the battery, and the battery voltage input terminal of the battery protection module 24 is connected to the wound cell 531.

[0040] As shown in Figure 6, the buck charging management module 23 includes a buck charging management chip U1 and a filter circuit unit. The buck charging management chip U1 is an IP5167. The battery voltage input pin of the buck charging management chip U1 is connected to the positive terminal of the wound 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 and then grounded. 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 lithium battery charging, it will change the current flowing to the battery through the inductor (the first inductor L1 in this embodiment) by adjusting the PWM signal on the SW pin. In the discharge state, the operation of the SW pin allows the current to flow from the battery to the external load while maintaining the stability of the output voltage.

[0041] Furthermore, as shown in Figure 6, the NTC pin of the buck charging management chip U1 is also connected to an external NTC thermistor for detecting battery temperature. When the detected temperature exceeds 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 is involved in the switching of current during charging and discharging. This 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. However, when the voltage on the SW pin exceeds the preset safety threshold, the TVS diode immediately starts, clamps the voltage to a safe level, and quickly releases the excess energy to the ground.

[0042] As shown in Figure 6, the battery protection module 24 includes a battery protection chip U2 and a protection filter capacitor C4. The battery protection chip U2 is a BP6452LC. The battery voltage input pin of the battery protection chip U2 is connected to the wound cell 531 and the buck charging management module 23. The VDD pin of the battery protection chip U2 is connected to the positive electrode 532 of the battery. The VCC pin of the battery protection chip U2 is connected in series with the protection filter capacitor C4 and connected to the negative electrode 533 of the battery.

[0043] The implementation principle of this application for a rechargeable lithium battery without a charging port is as follows: Unlike the prior art where elastic pins are used to connect the voltage regulating circuit board 2 and the second negative electrode metal shell 51, a negative electrode copper ring 21 is set 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 of the first negative electrode metal shell 1. In this way, the voltage regulating circuit board 2 is electrically connected to the second negative electrode metal shell 51 through the first negative electrode metal shell 1, that is, electrically connected to the negative electrode of the lithium battery cell 5. Due to the welding method, the electrical connection performance between the voltage regulating circuit board 2 and the first negative electrode metal shell 1 is very reliable, and there is no risk of poor contact. Firstly, there are no gaps between the first negative electrode metal casing 1 and the voltage regulating circuit board 2, eliminating the need for glue and achieving a sealing effect through solder. Secondly, the voltage regulating circuit board 2 is very firmly fixed, eliminating the need for an insulating support underneath, thus reducing the number of components and eliminating the need for assembling the insulating support. More importantly, it drastically reduces the height space occupied by the voltage regulating circuit board 2, allowing the space originally belonging to the insulating support to be filled by lengthening the lithium battery cell 5. This further increases the capacity of the lithium battery cell 5, resulting in a larger capacity lithium battery.

[0044] In another embodiment, referring to Figures 1 to 6, this application discloses a method for manufacturing a rechargeable lithium battery without a charging port, the method comprising the following steps:

[0045] S0.1, the wound cell assembly 53 is placed into the second negative electrode metal shell 51, and an annular groove 511 is made on the upper part of the second negative electrode metal shell 51.

[0046] S0.2, the negative electrode tab of the wound cell assembly 53 is welded to the bottom wall of the second negative electrode metal shell 51, and the positive electrode tab is welded to the high voltage positive electrode cap assembly 52.

[0047] S0.3, inject electrolyte;

[0048] S0.4, the high voltage positive electrode cap assembly 52 is placed into the second negative electrode metal shell 51, and a shrinkage part is made on the upper part of the second negative electrode metal shell 51.

[0049] S0.5, a second flange 512 is made on the upper edge of the second negative electrode metal shell 51 to fix the high voltage positive electrode cap assembly 52 in the shrinkage part to form a lithium battery cell 5.

[0050] S0.5, the lithium battery cell 5 is subjected to formation and capacity testing.

[0051] The first negative electrode metal shell 1 and the second negative electrode metal shell 51 are fixedly connected by spot welding or circumferential welding. Alternatively, the lower edge of the first negative electrode metal shell 1 can be contracted inward to form a constriction, thereby defining the constricted portion of the second negative electrode metal shell 51.

[0052] The manufacturing method of the rechargeable lithium battery without a charging port described in this embodiment includes the following steps:

[0053] S1, fabricate the first negative electrode metal shell 1, and form the first flange 11 on the top of the first negative electrode metal shell 1;

[0054] S2, the voltage regulating circuit board 2 is soldered to the inside of the first flange 11 of the first negative metal shell 1;

[0055] S3, the second negative electrode metal shell 51 is embedded into the first negative electrode metal shell 1, and then welded to fix it; because the second negative electrode metal shell 51 in this embodiment has a shrinkage part at the upper end, the first negative electrode metal shell 1 can fit into the shrinkage part to ensure contact conductivity. Spot welding or circumferential welding can completely fix the first negative electrode metal shell 1 and the second negative electrode metal shell 51; if the second negative electrode metal shell 51 does not have a shrinkage part at the upper end, then the second negative electrode metal shell 51 of the lithium battery cell 5 needs to be connected to the first negative electrode metal shell 1, and then welded to fix it;

[0056] S4, place or attach low-voltage positive and negative electrode insulating isolation sheets 6 on the outside of the first flange 11 of the first negative electrode metal shell 1;

[0057] S5, cover with an insulating outer skin, heat and shrink it so that the insulating outer skin wraps around the low-voltage positive and negative electrode insulating separator 6, the first negative electrode metal shell 1 and the lithium battery cell 5.

[0058] To better isolate the voltage regulating circuit board 2 and the lithium battery cell 5, prevent accidental short circuits between them, and ensure electrical safety, between steps S2 and S3, a step is also included in which the high voltage positive and negative electrode insulating isolation sheet 8 is pasted onto the second flange 512 of the lithium battery cell 5.

[0059] The manufacturing method described in this application has reasonable processes, a high yield rate, and can be industrialized, making it especially suitable for large-scale production.

[0060] In this embodiment, in step S2, the voltage regulating circuit board 2 can be welded to the inner side of the first flange 11 of the first negative electrode metal shell 1 using hot-press soldering or reflow soldering.

[0061] The manufacturing method of this embodiment has reasonable processes, high yield, and can further improve the capacity of lithium battery cells, making it particularly suitable for large-scale industrial production.

[0062] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. A rechargeable lithium battery without a charging port, characterized in that, include: The system comprises a first negative electrode metal shell, a voltage regulating circuit board, a low-voltage positive electrode cap, a high-voltage positive electrode connector, a lithium battery cell, and low-voltage positive and negative electrode insulating sheets. The first negative electrode metal shell has a first flange extending inwards at its upper end. The voltage regulating circuit board has a negative electrode copper ring and a positive electrode copper ring on its upper surface. The voltage regulating circuit board is welded to the inner side of the first flange on the first negative electrode metal shell via the negative electrode copper ring. The voltage regulating circuit board has a rechargeable circuit without a charging port. The low-voltage positive electrode cap is welded to the positive electrode copper ring. The high-voltage positive electrode connector is disposed on the inner surface of the voltage regulating circuit board. The lithium battery cell includes a second negative electrode metal shell and a high-voltage positive electrode cap assembly. The first and second negative electrode metal shells are electrically connected by butt joints or sleeve connections. 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 sheets are disposed above the first flange of the first negative electrode metal shell.

2. The rechargeable lithium battery without a charging port according to claim 1, characterized in that, The lithium battery cell also includes a wound cell assembly, which includes a wound cell, a positive electrode tab, and a negative electrode tab. The wound cell is welded to the high-voltage positive electrode cap assembly via the positive electrode tab. The negative electrode tab is wound from the side of the wound cell to the bottom and connected to the wound cell. The rechargeable circuit without a charging port includes a buck charging management module and a battery protection module. The buck charging management module is connected to the battery protection module. The battery voltage input terminal of the buck charging management module is connected to the wound cell, and the output power terminal of the buck charging management module is connected to the positive electrode tab. The power terminal of the battery protection module is connected to both the positive and negative electrode tabs, and the battery voltage input terminal of the battery protection module is connected to the wound 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 terminal of the wound battery cell. 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 and then grounded. 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 buck charging management chip is model 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 cell and the buck charging management module; the VDD pin of the battery protection chip is connected to the positive terminal 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 terminal of the battery.

6. A rechargeable lithium battery without a charging port according to claim 5, characterized in that, The battery protection chip is model 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 cell assembly. The upper part of the second negative electrode metal shell is provided with an annular groove, and the top is provided with a second flange. The wound cell assembly is disposed inside the second negative electrode metal shell and is positioned by the annular groove. The second negative electrode metal shell is divided into a lower body part and an upper constriction part by the annular groove. The outer diameter of the first negative electrode metal shell and the outer diameter of the second negative electrode metal shell body part are the same. The inner diameter of the first negative electrode metal shell and the outer diameter of the second negative electrode metal shell constriction part are the same. The constriction part of the second negative electrode metal shell is embedded in the first negative electrode metal shell. The outer surfaces of the first negative electrode metal shell and the second negative electrode metal shell are flush.

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

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

10. A method for manufacturing a rechargeable lithium battery without a charging port as described in any one of claims 1 to 9, characterized in that, The manufacturing method includes: The first negative electrode metal casing is manufactured, and the first flange is formed on the top of the first negative electrode metal casing; The voltage regulating circuit board with a rechargeable circuit without a charging port is soldered to the inside of the first flange of the first negative metal shell. The second negative electrode metal shell of the lithium battery cell is connected to the first negative electrode metal shell, or the second negative electrode metal shell is embedded in the first negative electrode metal shell and then welded to fix it. Place or attach low-voltage positive and negative electrode insulating sheets to the outside of the first flange of the first negative electrode metal casing; An insulating shell is fitted over the battery and then heated to shrink it, so that the insulating shell wraps around the low-voltage positive and negative electrode insulating separators, the first negative electrode metal shell, and the lithium battery cell.

Images