High-capacity rechargeable lithium battery and manufacturing method thereof

Abstract

The invention relates to a high-capacity rechargeable lithium battery and a manufacturing method thereof. 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 battery core, a low-voltage positive electrode and negative electrode insulating spacer and an insulating sheath. 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 electric connection performance is very reliable, and the sealing effect can be 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 can be greatly 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 high-capacity rechargeable lithium battery and a manufacturing method thereof. Background Art

[0002] Low-voltage lithium batteries convert the high voltage (3.7-4.4V) of lithium batteries into a low voltage of 1.5V through a step-down circuit board. They are made according to the sizes of No. 5 batteries, No. 7 batteries, etc., and can replace common alkaline batteries and nickel-metal hydride batteries.

[0003] In the Chinese utility model patent with publication number CN216624417U, a 1.5V constant voltage lithium battery is disclosed, including a battery cell and a step-down circuit board. Two ejectors are provided on the step-down circuit board, which are respectively used to electrically connect to the positive and negative electrodes of the battery cell. The step-down circuit board steps down the high voltage of the battery cell, and then the conductive electrode column is used as a low-voltage output positive electrode. The protective cap and the metal shell of the battery cell are low-voltage negative electrodes to output electrical energy. The top surface of the conductive cap on the top of the lithium battery cell is relatively flat, and the elastic contact with the positive electrode ejector is relatively good, but the negative electrode part on the top of the battery cell (the flange part of the metal shell of the battery cell) is uneven, and it is easy to cause poor contact when contacting with the negative electrode ejector; in addition, the step-down circuit board cannot be supported by the elastic force of the two ejectors alone, so the lithium battery also needs to be provided with an insulating bracket to support the step-down circuit board, which adds an extra component and increases the assembly steps, which needs to be improved. Summary of the invention

[0004] In order to solve the technical problems that the existing low-voltage lithium battery uses a negative electrode ejector pin to electrically connect the negative electrode of the battery cell, which is prone to poor contact, as well as the technical problems of a large number of parts and many assembly steps, the present invention provides a high-capacity rechargeable lithium battery and a manufacturing method thereof.

[0005] On the one hand, the technical solution provided by the present application is as follows: a high-capacity rechargeable lithium battery, comprising 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, a low-voltage positive and negative electrode insulating separator and an insulating outer skin; the first negative electrode metal shell is provided with a first flange inwardly at the upper end, a negative electrode copper ring and a positive electrode 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 electrode metal shell through the negative electrode copper ring, the low-voltage positive electrode cap is welded to the positive electrode copper ring, and the 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 electrode metal shell and a high-voltage positive electrode cap assembly, the first negative electrode metal shell and the second negative electrode metal shell are electrically connected by docking or sleeve connection, and the high-voltage positive electrode connector is elastically in contact with the high-voltage positive electrode cap assembly to achieve electrical connection; the low-voltage positive and negative electrode insulating isolation sheets are arranged above the first flange of the first negative electrode metal shell, and the insulating outer skin is coated on the outside of the low-voltage positive and negative electrode insulating isolation sheets of the first negative electrode metal shell and the second negative electrode metal shell.

[0006] By adopting the above technical scheme, the rechargeable lithium battery of the present application is the same as the prior art, and its voltage regulating circuit board is provided with necessary circuits such as a step-down circuit, a voltage stabilizing circuit, a charging circuit, and an over-discharge protection circuit, which is electrically connected to the lithium battery cell. The low-voltage positive electrode cap 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.

[0007] At the same time, the present application is the same as the prior art in the background technology, and the high-voltage positive electrode cap assembly of the lithium battery cell is electrically connected to the voltage regulating circuit board through a high-voltage positive electrode connector, but an elastic ejector pin is no longer used to connect the voltage regulating circuit board and the second negative electrode metal shell. Instead, a negative electrode copper ring is arranged on the upper surface of the voltage regulating circuit board, and the voltage regulating circuit board is welded to the inner side of the first flange of the first negative electrode metal shell by welding. In this way, 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, it is electrically connected to the negative electrode of the lithium battery cell. Due to the use of welding, firstly, the electrical connection performance between the voltage regulating circuit board and the first negative electrode metal shell is very reliable, and there is no problem at all The technical problem of poor contact; secondly, 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 by soldering, and water or dust will not enter here; thirdly, the voltage regulating circuit board is fixed very firmly, and there is no need to set an insulating bracket underneath for support, which eliminates the need for an insulating bracket, reduces the number of parts, and does not require 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. In this way, the capacity of the lithium battery cell can be further increased, thereby making the lithium battery have a larger capacity.

[0008] The present application provides a low-voltage positive and negative insulating spacer, which can effectively prevent the positive and negative electrodes of the lithium battery from short-circuiting, and the insulating outer skin can effectively fix the low-voltage positive and negative insulating spacer to prevent it from accidentally falling off.

[0009] Preferably, the high-voltage positive electrode connector is an elastic ejector pin, a conical spring or a spring.

[0010] Preferably, 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 its 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.

[0011] Preferably, a high-voltage positive and negative electrode insulating separator is pasted on the second flange on the top of the second negative electrode metal shell.

[0012] Preferably, the first negative electrode metal shell and the second negative electrode metal shell are fixedly connected by spot welding or circumferential welding, or the lower edge of the first negative electrode metal shell shrinks inward to form a shrinkage to define a shrinkage portion of the second negative electrode metal shell.

[0013] Preferably, a charging interface and an indicator light are provided on the voltage regulating circuit board, and a first opening and a second opening are respectively provided at corresponding positions of the first negative electrode metal shell and the insulating outer skin for exposing the charging interface and the indicator light.

[0014] On the other hand, the present application also provides another technical solution: a method for manufacturing the high-capacity rechargeable lithium battery described above, comprising the following steps: S1, manufacturing a first negative electrode metal shell, and forming a first flange on the top of the first negative electrode metal shell; S2, welding the voltage regulating circuit board to the inner side of the first flange of the first negative electrode metal shell; S3, docking the second negative electrode metal shell of the lithium battery with 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; S4, placing or sticking a low-voltage positive and negative electrode insulating separator on the outer side of the first flange of the first negative electrode metal shell; 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, the first negative electrode metal shell and the lithium battery cell.

[0015] Preferably, the method for manufacturing the lithium battery cell comprises the following steps: S0.1, placing the wound battery cell assembly into the second negative electrode metal shell, and making an annular rolling groove on the upper part of the second negative electrode metal shell; S0.2, welding the negative electrode tab of the wound battery cell assembly to the bottom wall of the second negative electrode metal shell, and welding the positive electrode tab to the high-voltage positive electrode cap assembly; S0.3, inject electrolyte; S0.4, placing the high-voltage positive electrode cap assembly into the second negative electrode metal shell, and making a contraction portion on the upper part of the second negative electrode metal shell; S0.5, making a second flange on the upper edge of the second negative electrode metal shell, fixing the high-voltage positive electrode cap assembly in the contraction portion, and forming a lithium battery cell; S0.5, process the lithium battery into different capacities.

[0016] Preferably, between steps S2 and S3, the method further includes the step of pasting high voltage positive and negative electrode insulating separators onto the second flange of the lithium battery cell.

[0017] Preferably, in step S2, the voltage regulating circuit board is welded to the inner side of the first flange of the first negative electrode metal shell by using a hot pressing tin melting welding process or a furnace welding process.

[0018] In summary, the present application includes at least one of the following beneficial technical effects: 1. The rechargeable lithium battery of this application is the same as the prior art, and can stably output 1.5V low voltage or other specific low voltage; 2. The electrical connection performance between the voltage regulating circuit board and the first negative electrode metal shell is very reliable, and there is no technical problem of poor contact at all. The sealing effect of solder welding is good, the voltage regulating circuit board is fixed very firmly, the insulating bracket is omitted, and the number of parts is reduced; 3. The height space occupied by the voltage regulating circuit board is extremely compressed. The space originally belonging to the insulating bracket can be filled by lengthening the length of the lithium battery cell, so that the capacity of the lithium battery cell can be further increased, thereby making the lithium battery have a larger capacity. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a three-dimensional diagram of the lithium battery described in the embodiment of the present application; Figure 2 is a schematic diagram of a half-section structure of a lithium battery according to an embodiment of the present application; Figure 3 yes Figure 2 Enlarged view of point A in the middle; Figure 4 is a back perspective view of the voltage regulating circuit board described in the embodiment of the present application; Figure 5It is a schematic diagram of welding the voltage regulating circuit board and the low voltage positive electrode cap described in the embodiment of the present application; Figure 6 It is a schematic diagram of welding the voltage regulating circuit board and the first negative electrode metal shell in the embodiment of the present application; Figure 7 This is a schematic diagram of the assembly of the first negative electrode metal shell and the lithium battery cell in the embodiment of the present application; Figure 8 It is a schematic diagram of the assembly action of placing low-voltage positive and negative electrode insulating spacers, and putting on insulating outer skins and performing heating and shrinking in an embodiment of the present application; Fig. 9 It is a schematic diagram of the assembly action of installing the wound battery cell assembly into the second negative electrode metal shell in the embodiment of the present application; Fig.10 is a schematic diagram of making an annular rolling groove on the upper part of the second negative electrode metal shell in an embodiment of the present application; Fig.11 It is a schematic diagram of the assembly action of installing the high-voltage positive electrode cap assembly into the second negative electrode metal shell in the embodiment of the present application; Fig.12 is a schematic diagram of manufacturing a contraction portion on the upper portion of the second negative electrode metal shell in an embodiment of the present application; Fig.13 It is a schematic diagram of placing high-voltage positive and negative electrode insulating isolation sheets and making a second flange on the upper part of the second negative electrode metal shell in an embodiment of the present application.

[0020] Explanation of the accompanying drawings: 1. First negative electrode metal shell; 11. First flange; 12. First opening; 2. Voltage regulating circuit board; 21. Negative electrode copper ring; 22. Positive electrode copper ring; 23. Charging interface; 24. Indicator light; 25. All-in-one control chip; 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; 513. Main body; 514. Contraction part; 52. High-voltage positive electrode cap assembly; 53. Winding battery cell assembly; 6. Low-voltage positive and negative electrode insulating spacers; 7. Insulating skin; 71. Second opening; 8. High-voltage positive and negative electrode insulating spacers. DETAILED DESCRIPTION

[0021] The following is combined with Figures 1 to 13 This application is described in further detail.

[0022] Reference Figures 1 to 6 This embodiment discloses a high-capacity rechargeable lithium battery, which is specifically an AA battery (No. 5 battery), but the application is not limited to AA batteries, including 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 outer skin 7.

[0023] Specifically, a first flange 11 is provided inwardly at the upper end of the first negative metal shell 1, and 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 low-voltage positive cap 3 is welded on the positive copper ring 22. 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 sleeve connection, and the high-voltage positive connector 4 is elastically in contact with the high-voltage positive cap assembly 52 to achieve electrical connection; 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 7 is coated on the outside of the low-voltage positive and negative insulating separators 6 of the first negative metal shell 1 and the second negative metal shell 51.

[0024] Reference Figure 6 and Figure 8 The voltage regulating circuit board 2 is provided with a charging interface 23 and an indicator light 24, and the first negative electrode metal shell 1 and the insulating outer skin 7 are respectively provided with a first opening 12 and a second opening 71 at corresponding positions for exposing the charging interface 23 and the indicator light 24, and the charging interface 23 is preferably a TYPE-C universal interface.

[0025] Reference Figures 2 to 4 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.

[0026] Reference Figure 2 and Figure 3 The lithium battery cell 5 also includes a wound battery cell assembly 53. 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 battery 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 513 below and a contraction part 514 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 513 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 514 of the second negative metal shell 51. The contraction part 514 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.

[0027] In this embodiment, the manufacturing method of the lithium battery cell 5 includes the following steps: S0.1, refer to Fig. 9 , 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, refer to Fig.11 and Fig.12 , placing the high-voltage positive electrode cap assembly 52 into the second negative electrode metal shell 51, and making a contraction portion 514 on the upper portion of the second negative electrode metal shell 51; S0.5, refer to Fig.13 , a second flange 512 is made on the upper edge of the second negative electrode metal shell 51, and the high-voltage positive electrode cap assembly 52 is fixed in the contraction portion 514 to form a lithium battery cell 5; S0.5, performing a capacity processing on the lithium battery cell 5.

[0028] Reference Figure 7 The first negative electrode metal shell 1 and the second negative electrode metal shell 51 are fixedly connected by spot welding or circumferential welding. The lower edge of the first negative electrode metal shell 1 can also be contracted inward to form a contraction to define the contraction portion of the second negative electrode metal shell 51.

[0029] The method for manufacturing the high-capacity rechargeable lithium battery of 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, reference Figure 6 , 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, refer to Figure 7 , embed the second negative metal shell 51 into the first negative metal shell 1, and then weld and fix them; because the second negative metal shell 51 of this embodiment is provided with a contraction portion 514 at the upper end, the first negative metal shell 1 can just fit into the contraction portion 514 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 514 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, ref. Figure 8, placing or pasting 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, refer to Figure 8 , put on the insulating outer skin 7, heat and shrink it, so that the insulating outer skin 7 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 core 5.

[0030] 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.

[0031] 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.

[0032] 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 pressure tin melting welding process (HOTBAR) or a furnace welding process.

[0033] When the hot-pressing tin-melting welding process is adopted, since there is no need to heat the voltage-regulating circuit board 2 and the first negative electrode metal shell 1 as a whole, only local heating is required at the welding point, which will not affect other components welded on the voltage-regulating circuit board 2. The hot-pressing tin-melting welding process has simple equipment, is easy to use, and has low energy consumption.

[0034] If the furnace welding process is adopted, since the voltage regulating circuit board 2 and the first negative electrode metal shell 1 will be heated as a whole when passing through the welding furnace, it is necessary to ensure that the solder at the bottom of the components that have been welded on the voltage regulating circuit board 2 will not melt again to avoid the displacement or falling of the components. In this embodiment, the all-in-one control chip 25 of the lithium battery is arranged inside the low-voltage positive electrode cap 3, so it is necessary to weld the all-in-one control chip 25 first, and then weld the low-voltage positive electrode cap 3. Only the components on the front of the voltage regulating circuit board 2 need to be welded twice to complete. For this reason, when making the voltage regulating circuit board 2, the low-voltage positive electrode cap 3 can be welded first, but in step S2, the low-voltage positive electrode cap 3 is welded to the voltage regulating circuit board 2 at the same time. In this way, the components on the front of the voltage regulating circuit board 2 only need to be welded once, and there is no need to perform furnace welding again for the low-voltage positive electrode cap 3, which saves a step and reduces the process cost.

[0035] The implementation principle of the present application is as follows: the rechargeable lithium battery of the present application is the same as the prior art, and its voltage regulating circuit board 2 is provided with necessary circuits such as a step-down circuit, a voltage stabilizing circuit, a charging circuit, and an over-discharge protection circuit, which is electrically connected to the lithium battery cell 5, and the low-voltage positive electrode cap 3 serves as the positive electrode of the battery, and the second negative electrode metal shell 51 of the lithium battery cell 5 serves as the negative electrode of the battery, which can stably output a low voltage of 1.5V or other specific low voltages.

[0036] At the same time, the present application is the same as the prior art in the background technology, and the high-voltage positive electrode cap assembly 52 of the lithium battery cell 5 is electrically connected to the voltage regulating circuit board 2 through the high-voltage positive electrode connector 4, but the elastic ejector pin is no longer used to connect the voltage regulating circuit board 2 and the second negative electrode metal shell 51. Instead, a negative electrode 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 electrode metal shell 1 by welding. 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 in turn, that is, it is electrically connected to the negative electrode of the lithium battery cell 5. Due to the use of welding, firstly, the electrical connection performance of the voltage regulating circuit board 2 and the first negative electrode metal shell 1 is very good. It is very reliable, and there is no technical problem of poor contact 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. The sealing effect can be achieved by soldering, and water or dust will not enter here; 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.

[0037] The present application provides a low-voltage positive and negative insulating isolation sheet 6, which can effectively prevent the positive and negative electrodes of the lithium battery from short-circuiting and ensure electrical safety. The insulating outer skin 7 can effectively fix the low-voltage positive and negative insulating isolation sheet 6 to prevent it from accidentally falling off.

[0038] 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 high-capacity rechargeable lithium battery, characterized in that: It includes a first negative metal shell, a voltage regulating 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 outer skin; the first negative metal shell is provided with a first flange inwardly at the upper end, and the upper surface of the voltage regulating circuit board is provided with a negative copper ring and a positive copper ring. 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, the low-voltage positive cap is welded on the positive copper ring, and the high-voltage positive 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 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 to achieve electrical connection; the low-voltage positive and negative insulating separators are arranged above the first flange of the first negative metal shell, and the insulating outer skin is coated on the first negative metal shell and the second negative metal shell. Low-voltage positive and negative insulating separators.

2. The high-capacity rechargeable lithium battery according to claim 1, characterized in that: The high-voltage positive electrode connector is an elastic ejector pin, a conical spring or a spring.

3. The high-capacity rechargeable lithium battery according to claim 1, 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.

4. The high-capacity rechargeable lithium battery according to claim 3, characterized in that: A high-voltage positive and negative electrode insulating separator is pasted on the second flange on the top of the second negative electrode metal shell.

5. The high-capacity rechargeable lithium battery according to claim 3, characterized in that: The first negative electrode metal shell and the second negative electrode metal shell are fixedly connected by spot welding or circumferential welding, or the lower edge of the first negative electrode metal shell shrinks inward to form a shrinkage to define a shrinkage portion of the second negative electrode metal shell.

6. The high-capacity rechargeable lithium battery according to claim 1, characterized in that: The voltage regulating circuit board is provided with a charging interface and an indicator light, and the first negative electrode metal shell and the insulating outer skin are respectively provided with a first opening and a second opening at corresponding positions thereof for exposing the charging interface and the indicator light.

7. A method for manufacturing a high-capacity rechargeable lithium battery according to any one of claims 1 to 6, characterized in that: The following steps are involved: S1, manufacturing a first negative electrode metal shell, and forming a first flange on the top of the first negative electrode metal shell; S2, welding the voltage regulating circuit board to the inner side of the first flange of the first negative electrode metal shell; S3, docking the second negative electrode metal shell of the lithium battery with 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; S4, placing or sticking a low-voltage positive and negative electrode insulating separator on the outer side of the first flange of the first negative electrode metal shell; 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, the first negative electrode metal shell and the lithium battery cell.

8. The method for manufacturing a high-capacity rechargeable lithium battery according to claim 7, characterized in that: The manufacturing method of the lithium battery core comprises the following steps: S0.1, placing the wound battery cell assembly into the second negative electrode metal shell, and making an annular rolling groove on the upper part of the second negative electrode metal shell; S0.2, welding the negative electrode tab of the wound battery cell assembly to the bottom wall of the second negative electrode metal shell, and welding the positive electrode tab to the high-voltage positive electrode cap assembly; S0.3, inject electrolyte; S0.4, placing the high-voltage positive electrode cap assembly into the second negative electrode metal shell, and making a contraction portion on the upper part of the second negative electrode metal shell; S0.5, making a second flange on the upper edge of the second negative electrode metal shell, fixing the high-voltage positive electrode cap assembly in the contraction portion, and forming a lithium battery cell; S0.5, process the lithium battery into different capacities.

9. The method for manufacturing a high-capacity rechargeable lithium battery according to claim 7, characterized in that: Between step S2 and step S3, the method further includes the step of pasting the high voltage positive and negative electrode insulating separators onto the second flange of the lithium battery cell.

10. The method for manufacturing a high-capacity rechargeable lithium battery according to claim 7, characterized in that: In step S2, the voltage regulating circuit board is welded to the inner side of the first flange of the first negative electrode metal shell by using a hot pressing tin melting welding process or a furnace welding process.

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