1.5 V lithium battery with built-in step-down board

Abstract

The 1.5 V lithium battery with the built-in step-down board comprises a cap assembly, a winding cell assembly, an electrolyte, a metal shell and an insulating sleeve, the insulating sleeve is wrapped outside the metal shell, the winding cell assembly and the cap assembly are sequentially arranged in the metal shell from bottom to top, a rolling groove is inwards formed in the position, close to the upper end, of the metal shell, and the step-down board is arranged in the rolling groove. The top of the metal shell is provided with a sealing buckling edge which can be bent inwards, the rolling groove limits the winding battery cell assembly on the inner side of the metal shell below the rolling groove of the metal shell, the electrolyte is arranged in the winding battery cell assembly on the inner side of the metal shell, and the cap assembly comprises a pressure reduction plate. The cap assembly is arranged on the inner side of the metal shell on the upper side of the rolling groove and is inwards extruded and fixed by the sealing buckling edge, and the cap assembly and the metal shell are sealed through a plastic sealing ring of the cap assembly. By adopting the structure, the processing efficiency is high, the cost is reduced, and the battery capacity is effectively improved.

Description

Technical Field

[0001] This utility model relates to a lithium battery, and more particularly to a 1.5V lithium battery with a built-in step-down plate. Background Technology

[0002] 1.5V batteries are widely used in many fields, including electric toothbrushes, shavers, wireless microphones, toys, etc. 1.5V batteries are mainly alkaline batteries and nickel-metal hydride batteries. Although these two types of batteries are convenient to use, they have short lifespans and low capacity. They can only be used once and then discarded, which will cause environmental pollution and is not environmentally friendly. In response to this situation, some rechargeable batteries, such as 1.5V lithium batteries, have appeared on the market. The existing 1.5V lithium battery structure can be found in the "constant voltage 1.5V lithium battery" described in Chinese patent application number 202022509514.3. Although this 1.5V lithium battery has good overall performance, it requires placing the battery cell in the battery casing, welding the nickel sheet to the positive electrode of the battery cell by spot welding, and then placing the lithium battery protection board and sealing ring in the battery casing. The battery cell needs to be externally processed to add the lithium battery protection board. This existing lithium battery processing procedure is complex, inefficient, and costly. At the same time, since the battery cell and connecting components need to be assembled inside the battery casing, it will occupy some space. When the battery casing is not large enough, the size of the battery cell will be smaller, and the battery capacity will also be reduced. Summary of the Invention

[0003] The purpose of this invention is to address the shortcomings of the existing technology by providing a 1.5V lithium battery with a built-in step-down plate, which has high processing efficiency, reduces costs, and effectively increases battery capacity.

[0004] The technical solution adopted by this utility model to achieve the above-mentioned objective is as follows: a 1.5V lithium battery with a built-in step-down plate, including a cap assembly, a wound cell assembly, an electrolyte, a metal shell, and an insulating sleeve. The insulating sleeve covers the outside of the metal shell. The wound cell assembly and the cap assembly are placed into the metal shell from bottom to top. The metal shell has a groove extending inward from the upper end, and a sealing edge that can be bent inward at the top of the metal shell. The groove confines the wound cell assembly to the inner side of the metal shell below the groove. The electrolyte is disposed in the wound cell assembly inside the metal shell. The cap assembly includes a step-down plate. The cap assembly is disposed inside the metal shell above the groove and is pressed and fixed inward by the sealing edge. The plastic sealing ring of the cap assembly achieves a seal between the cap assembly and the metal shell.

[0005] A further technical solution of this utility model is as follows: the cap assembly further includes a plastic sealing ring, an explosion-proof valve, and a steel cap. The step-down plate of the cap assembly includes a PCB board, a positive electrode ring, a positive outer ring, a negative electrode ring, an IC, an inductor, a capacitor, and an indicator light. The IC, inductor, capacitor, and indicator light are respectively connected to the PCB board. The positive electrode ring is set on the upper surface of the PCB board, and an insulating layer surrounds the outside of the positive electrode ring. The negative electrode ring surrounds the insulating layer. The positive outer ring is set on the bottom surface of the PCB board and is electrically connected to the positive electrode ring on the upper surface. The steel cap is connected to the positive electrode ring on the upper surface of the PCB board. The explosion-proof valve is connected to the positive outer ring on the bottom surface of the PCB board. The assembly formed by the explosion-proof valve and the step-down plate is positioned inside the plastic sealing ring. The sealing edge of the metal shell is connected to the negative electrode ring of the PCB board.

[0006] A further technical solution of this utility model is as follows: the wound battery cell assembly includes a wound battery cell, a positive electrode tab, a negative electrode tab, an upper insulating pad, and a lower insulating pad. The upper insulating pad is connected to the upper end face of the wound battery cell. The positive electrode tab is located in the middle of the wound battery cell. The positive electrode tab passes through the center hole of the upper insulating pad and is connected to the bottom end of the explosion-proof valve of the cap assembly. The negative electrode tab is folded from the side of the wound battery cell to the bottom surface. A lower insulating pad is placed between the bottom surface of the wound battery cell and the negative electrode tab. The lower end of the negative electrode tab is connected to the bottom of the metal shell by welding.

[0007] This utility model discloses a 1.5V lithium battery with a built-in step-down plate, which has the following advantages: The wound cell assembly is directly placed inside the metal casing and electrolyte is injected. The cap assembly is built into the step-down plate and directly connected to the upper end of the metal casing, and is pressed inward by the sealing edge. Compared with existing finished cells that use a secondary processing method to add a step-down plate externally, the built-in step-down plate solution in this patent application is safer, more reliable, has higher processing efficiency, and lower cost. By directly placing the wound cell assembly inside the metal casing and then directly connecting the cap assembly with the pressure plate to the upper end of the metal casing and fixing it by the sealing edge, there is no need to weld components inside the metal casing, thus saving space. The metal casing can accommodate a larger wound cell, effectively increasing battery capacity.

[0008] The following description, in conjunction with the accompanying drawings and embodiments, further illustrates a 1.5V lithium battery with a built-in step-down plate according to this utility model. Attached Figure Description

[0009] Figure 1 This is a partially exploded schematic diagram of a 1.5V lithium battery with a built-in step-down plate according to this utility model.

[0010] Figure 2 This is a schematic diagram of a 1.5V lithium battery with a built-in step-down plate of the present invention, with the cap assembly installed on the upper end of the metal casing without being sealed.

[0011] Figure 3 yes Figure 2 A cross-sectional view along the AA direction (the inner side of the metal casing winding the battery cell assembly is omitted).

[0012] Figure 4 This is a schematic diagram of a 1.5V lithium battery with a built-in step-down plate according to this utility model, after the cap assembly is installed and sealed on the upper end of the metal casing.

[0013] Figure 5 yes Figure 4 A cross-sectional view along the BB direction (the inner side of the metal casing winding the cell assembly is omitted).

[0014] Figure 6 yes Figure 3 Enlarged view of section I;

[0015] Figure 7 yes Figure 5 Enlarged view of section II;

[0016] Figure 8 This is a bottom view of the pressure reducing plate;

[0017] Figure 9 This is the front view of the step-down plate;

[0018] Figure 10 This is a top view of the pressure relief plate;

[0019] Figure 11 This is the PCB circuit diagram of the step-down circuit board;

[0020] Figure 12 This is a schematic diagram of the structure of a wound battery cell assembly;

[0021] Figure 13 yes Figure 12 A cross-sectional view along the CC direction.

[0022] Explanation of reference numerals: 1-Metal casing, 2-Plastic sealing ring, 3-Explosion-proof valve, 4-Step-down plate, 5-Steel cap, 6-Roll groove, 7-Cap assembly, 8-Sealing edge, 9-Positive outer ring, 10-PCB board, 11-Inductor, 12-Capacitor, 13-Negative ring, 14-Indicator light, 15-IC, 16-Positive ring, 17-Positive tab, 18-Wound cell, 19-Negative tab, 20-Upper insulating pad, 21-Lower insulating pad, 22-Wound cell assembly. Detailed Implementation

[0023] like Figures 1 to 13 As shown, this utility model discloses a 1.5V lithium battery with a built-in step-down plate 4, including a cap assembly 7, a wound cell assembly 22, an electrolyte, a metal shell 1, and an insulating sleeve.

[0024] like Figures 1 to 7 and Figure 12 ,13 As shown, the wound cell assembly 22 and the cap assembly 7 are sequentially placed inside the metal casing 1 from bottom to top. The metal casing 1 has a groove 6 extending inwards from its upper end, and a sealing edge 8 that can be bent inwards at the top. The groove 6 confines the wound cell assembly 22 to the inner side of the metal casing 1 below the groove 6. The electrolyte is disposed within the wound cell assembly 22 inside the metal casing 1. The cap assembly 7 is disposed inside the metal casing 1 above the groove 6 and is pressed inwards and fixed by the sealing edge 8. The plastic sealing ring 2 of the cap assembly 7 achieves a seal between the cap assembly 7 and the metal casing 1. An insulating sleeve covers the outside of the metal casing 1, and the electrolyte is disposed within the wound cell assembly 22. The insulating sleeve and electrolyte are not shown in the figure; they are existing technologies and will not be described in detail.

[0025] like Figures 1 to 11 As shown, the cap assembly 7 includes a step-down plate 4, a plastic sealing ring 2, an explosion-proof valve 3, and a steel cap 5. The step-down plate 4 of the cap assembly 7 includes a PCB board 10, a positive electrode ring 16, a positive outer ring 9, a negative electrode ring 13, an IC15 (an abbreviation for Integrated Circuit), an inductor 11, a capacitor 12, and an indicator light 14. The IC15, inductor 11, capacitor 12, and indicator light 14 are respectively connected to the PCB board 10. The circuit schematic of the PCB board 10 can be found in [reference needed]. Figure 11 As shown, LED - charge / discharge status indicator 14, NTC - temperature detection pin (connected to ground via a 100K 4250 NTC resistor), VBAT - lithium battery positive terminal input pin, SW - power switch output (connected to inductor 11), VAP - charger input (can be shorted with VOUT), VOUT - 1.5V / 3.0V output (can be shorted with VAP), ISET - charging current setting terminal, GND - ground. The circuit principle is not the inventive point of this utility model and will not be described in detail here. Figure 8-10 As shown, the positive electrode ring 16 is disposed on the upper surface of the PCB board 10, and an insulating layer surrounds the outside of the positive electrode ring 16. The negative electrode ring 13 surrounds the insulating layer, and the positive outer ring 9 is disposed on the bottom surface of the PCB board 10 and is electrically connected to the positive electrode ring 16 on the upper surface. Figure 6 , 7 As shown, the inner side of the plastic sealing ring 2 is provided with a positioning stepped sealing ring. The steel cap 5 is welded to the positive electrode ring 16 on the upper surface of the PCB board 10, and the steel cap 5 is the positive electrode of the battery. The explosion-proof valve 3 is connected to the positive electrode outer ring 9 on the bottom surface of the PCB board 10. The assembly formed by the explosion-proof valve 3 and the step-down plate 4 is positioned inside the plastic sealing ring 2. When the sealing edge 8 is pressed inward to fix the cap assembly 7, the sealing edge 8 of the metal shell 1 is connected to the negative electrode ring 13 of the PCB board 10.

[0026] like Figure 12, 13 As shown, the wound battery cell assembly 22 includes a wound battery cell 18, a positive electrode tab 17, a negative electrode tab 19, an upper insulating pad 20, and a lower insulating pad 21. The wound battery cell 18 is existing technology and its structure will not be described in detail. The upper insulating pad 20 is connected to the upper end face of the wound battery cell 18. The positive electrode tab 17 is located in the middle of the wound battery cell 18, passing through the central hole of the upper insulating pad 20 and connecting to the bottom end of the explosion-proof valve 3 of the cap assembly 7. The negative electrode tab 19 is folded from the side of the wound battery cell 18 to the bottom surface. The lower insulating pad 21 is placed between the bottom surface of the wound battery cell 18 and the negative electrode tab 19. The lower end of the negative electrode tab 19 is welded to the bottom of the metal casing 1. The bottom of the metal casing 1 is the negative terminal of the battery.

[0027] The present invention is installed using the following steps: S1, the wound cell assembly 22 is placed inside the metal shell 1, and the end face of the negative electrode tab 19 is spot welded to the bottom of the metal shell 1 to connect the negative electrode tab 19 to the metal shell 1; S2, the metal shell 1 is fixed and limited by the rolling groove 6; S3, electrolyte is injected into the wound cell assembly 22; S4, the positive electrode tab 17 of the wound cell assembly 22 is welded to the bottom surface of the explosion-proof valve 3 of the cap assembly 7; S5, the cap assembly 7 is placed inside the top sealing edge 8 of the metal shell 1; S6, the sealing edge 8 of the upper edge of the metal shell 1 is closed inward by means of a forming mold to confine the cap assembly 7 inside the metal shell 1; S7, the top cover insulating pad is attached; S8, the insulating sleeve of the metal shell 1 is fitted.

[0028] The above embodiments are merely preferred embodiments of this utility model. The structure of this utility model is not limited to the forms listed in the above embodiments. Any modifications, equivalent substitutions, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A 1.5V lithium battery with a built-in step-down plate, comprising a cap assembly (7), a wound cell assembly (22), an electrolyte, a metal casing (1), and an insulating sleeve, wherein the insulating sleeve covers the metal casing (1), characterized in that, The wound cell assembly (22) and the cap assembly (7) are placed into the metal shell (1) from bottom to top. The metal shell (1) has a groove (6) at the upper end and a sealing edge (8) that can be bent inward at the top. The groove (6) limits the wound cell assembly (22) to the inside of the metal shell (1) below the groove (6). The electrolyte is placed in the wound cell assembly (22) inside the metal shell (1). The cap assembly (7) includes a step-down plate (4). The cap assembly (7) is placed inside the metal shell (1) above the groove (6) and is pressed and fixed inward by the sealing edge (8). The plastic sealing ring (2) of the cap assembly (7) achieves the seal between the cap assembly (7) and the metal shell (1).

2. A 1.5V lithium battery with a built-in step-down plate as described in claim 1, characterized in that, The cap assembly (7) also includes a plastic sealing ring (2), an explosion-proof valve (3), and a steel cap (5). The step-down plate (4) of the cap assembly (7) includes a PCB board (10), a positive electrode ring (16), a positive outer ring (9), a negative electrode ring (13), an IC (15), an inductor (11), a capacitor (12), and an indicator light (14). The IC (15), inductor (11), capacitor (12), and indicator light (14) are respectively connected to the PCB board (10). The positive electrode ring (16) is set on the upper surface of the PCB board (10), and the outer side of the positive electrode ring (16) is... There is an insulating layer around it. The negative electrode ring (13) is around the outside of the insulating layer. The positive electrode outer ring (9) is set on the bottom surface of the PCB board (10) and is electrically connected to the positive electrode ring (16) on the upper surface. The steel cap (5) is connected to the positive electrode ring (16) on the upper surface of the PCB board (10). The explosion-proof valve (3) is connected to the positive electrode outer ring (9) on the bottom surface of the PCB board (10). The assembly formed by the explosion-proof valve (3) and the step-down plate (4) is positioned inside the plastic sealing ring (2). The sealing edge (8) of the metal shell (1) is connected to the negative electrode ring (13) of the PCB board (10).

3. A 1.5V lithium battery with a built-in step-down plate as described in claim 2, characterized in that, The wound battery cell assembly (22) includes a wound battery cell (18), a positive electrode tab (17), a negative electrode tab (19), an upper insulating pad (20), and a lower insulating pad (21). The upper insulating pad (20) is connected to the upper end face of the wound battery cell (18). The positive electrode tab (17) is located in the middle of the wound battery cell (18). The positive electrode tab (17) passes through the center hole of the upper insulating pad (20) and is connected to the bottom end of the explosion-proof valve (3) of the cap assembly (7). The negative electrode tab (19) is folded from the side of the wound battery cell (18) to the bottom surface. The lower insulating pad (21) is placed between the bottom surface of the wound battery cell (18) and the negative electrode tab (19). The lower end of the negative electrode tab (19) is connected to the bottom of the metal shell (1) by welding.

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