A 18650 lithium battery cell with protection function and protection method

Abstract

The invention discloses a 18650 lithium battery cell with a protection function and a protection method, comprising a cell shell, wherein a partition plate is fixedly connected to the inner wall of the cell shell, a negative electrode plate is inlaid on the inner wall of the cell shell, a battery pad is movably connected to the top surface of the negative electrode plate, a conductive plate is movably connected to the top surface of the battery pad, an insulating tube, an electrolyte paper roll and a cell rod are fixedly connected to the top surface of the conductive plate from the outside of the conductive plate to the axis in sequence, an insulating plastic cover is fixedly connected to the surface of the insulating tube, a sealing metal cover is fixedly connected to the top surface of the insulating tube, a puncture needle is movably connected to the surface of the sealing metal cover, and an air release valve is arranged on the inner wall of the sealing metal cover; the invention uses the puncture needle and the insulating bag to disconnect the expanded battery from the cell after the insulating liquid in the insulating tube is heated and expanded, and will not be used any more, thereby achieving the effect of reducing the safety hazard of the battery in the power bank.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium batteries, and in particular to a 18650 lithium battery cell with a protection function and a protection method. Background Art

[0002] The 18650 lithium battery is a cylindrical lithium battery with a diameter of 18mm and a length of 65mm. Due to the advantages of 18650 lithium battery such as large capacity, good stability, environmental protection and no memory effect, it is widely used in various electronic devices such as laptops and power banks.

[0003] Existing 18650 lithium batteries are often used together in power banks. The connected lithium batteries are often called battery cells. When the battery cell composed of 18650 lithium batteries encounters pressure or a short circuit, the 18650 lithium batteries inside the battery cell will swell. The swollen lithium batteries will mostly be hidden in the device and are not easy to be discovered in time. If they continue to be used, they are prone to bursting, posing certain safety hazards. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides an 18650 lithium battery cell with protection function and a protection method, which has the advantage of reducing the potential safety hazards of the battery cell and solves the problem in the prior art that the battery cell cannot be discovered in time after expansion due to heat or pressure, resulting in certain potential safety hazards in subsequent use.

[0005] The 18650 lithium battery cell with a protective function of the present invention comprises a cell shell, the inner wall of the cell shell is fixedly connected with a partition plate, the inner wall of the cell shell is inlaid with a negative electrode plate, the top surface of the negative electrode plate is movably connected with a battery pad, the top surface of the battery pad is movably connected with a conductive disk, the top surface of the conductive disk is sequentially fixedly connected with an insulating tube, an electrolyte paper roll and a cell rod from the outside of the conductive disk to the axis, the surface of the insulating tube is fixedly connected with an insulating plastic cover, the top surface of the insulating tube is fixedly connected with a sealing metal cover, the surface of the sealing metal cover is movably connected with a pricking needle, and the sealing metal cover The inner wall is provided with a relief valve, the bottom surface of the relief valve is movably connected to the top of the battery rod, the top surface of the sealing metal cover is movably connected to the positive spring, the top surface of the positive spring is fixedly connected to the electrode movable plate, the top surface of the battery shell is provided with a movable groove adapted to the electrode movable plate, the inner wall of the electrode movable plate is inlaid with a conductive long plate, the top surface of the battery shell is inlaid with a conductive short plate, one end of the conductive long plate is overlapped with the surface of the conductive short plate, the top surface of the battery shell is fixedly connected to a power-off protection cover, the inner wall of the power-off protection cover is fixedly connected to an insulating bag, and insulating oil is arranged inside the insulating bag.

[0006] The 18650 lithium battery cell with protection function of the present invention has a rubber cover fixedly connected to the inner wall of the sealing metal cover, a movable push plate fixedly connected to the surface of the rubber cover, and a top surface of the movable push plate fixedly connected to the bottom end of the puncture needle.

[0007] The 18650 lithium battery cell with a protective function of the present invention comprises four insulating packages and four battery cell rods.

[0008] The 18650 lithium battery cell with protection function of the present invention has four insulation packages and cell rods evenly distributed inside the cell shell and the power-off protection cover.

[0009] The 18650 lithium battery cell with a protective function of the present invention has through holes adapted to the puncture needles on the surfaces of the conductive long plate and the electrode movable plate.

[0010] The 18650 lithium battery cell with protection function of the present invention, wherein the piercing needle is located directly below the insulation package.

[0011] The 18650 lithium battery cell with protection function of the present invention comprises an insulating package made of a PPE plastic, and a cell protection cover is fixedly connected to the surface of the cell shell by screws.

[0012] The 18650 lithium battery cell with protection function of the present invention has an inner wall of the power-off protection cover fixedly connected with an isolation plate, and the number of the isolation plates is three.

[0013] The 18650 lithium battery cell with a protective function of the present invention has three isolation plates evenly distributed between four insulation packages.

[0014] A protection method for 18650 lithium battery cells with a protection function, characterized in that: if gas appears in an insulating tube, the battery expands as a whole, and at this time, the gas enters the sealed metal cover through the vent valve, pushing the movable push plate upward, and at this time, the piercing needle can be moved up to the insulating package, and the piercing needle will pierce the insulating package, and the insulating oil will flow out and flow into the cell shell along the gap between the conductive long plate and the conductive short plate, so that the conductive short plate and the conductive long plate are fully separated and insulated, and the sealed metal cover continues to expand to push the electrode movable plate into the sealed metal cover, and the electrode movable plate drives the conductive long plate to move up, so that the conductive short plate and the conductive long plate are separated and staggered, and the expanded battery is separated from the cell.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. The present invention uses a piercing needle and an insulating bag so that after the insulating liquid in the insulating tube expands due to heat, the gas is discharged from the vent valve into the sealed metal cover, and the sealed metal cover is subjected to an expansion force, so that the piercing needle can gradually extend to the insulating bag, puncture the insulating bag, and the insulating oil flows out. The sealed metal cover can continue to push out the electrode movable plate, and the conductive long plate and the conductive short plate can be separated, thereby disconnecting the expanded battery from the battery core and preventing it from being used further, thereby achieving the effect of reducing the safety hazards of batteries in power banks.

[0017] 2. The present invention uses a rubber cover and a movable push plate. After the sealed metal cover is filled with gas, the movable push plate can be forced to move upward. At the same time, the rubber cover ensures that the internal gas will not leak out to the outside of the sealed metal cover, so that when the sealed metal cover does not push out the electrode movable plate, the puncture needle can move upward in advance to pierce the insulating bag, thereby ensuring the normal expansion of the subsequent sealed metal cover, thereby achieving the effect of ensuring the normal operation of the function of reducing the safety hazard of the battery cell in the event of an accident. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0019] Figure 1 This is a schematic diagram of the cross-section structure of an 18650 lithium battery cell with protection function;

[0020] Figure 2 for Figure 1 The enlarged structural diagram at A in the middle;

[0021] Figure 3 for Figure 1 Enlarged structural diagram at B in the middle.

[0022] In the figure: 1. battery cell shell; 2. separator; 3. negative electrode plate; 4. battery pad; 5. conductive disk; 6. insulating tube; 7. electrolyte paper roll; 8. battery cell rod; 9. insulating plastic cover; 10. sealing metal cover; 11. puncture needle; 12. vent valve; 13. positive electrode spring; 14. electrode movable plate; 15. conductive long plate; 16. conductive short plate; 17. power-off protection cover; 18. insulating bag; 19. rubber cover; 20. movable push plate; 21. separator; 22. battery cell protection cover. DETAILED DESCRIPTION

[0023] The following are several embodiments of the present invention disclosed in the following figures:

[0024] Example 1: Please refer to Figure 1-3A 18650 lithium battery cell with a protective function comprises a cell shell 1, a partition plate 2 is fixedly connected to the inner wall of the cell shell 1, a negative electrode plate 3 is inlaid on the inner wall of the cell shell 1, a battery pad 4 is movably connected to the top surface of the negative electrode plate 3, a conductive plate 5 is movably connected to the top surface of the battery pad 4, an insulating tube 6, an electrolyte paper roll 7 and a cell rod 8 are fixedly connected to the top surface of the conductive plate 5 from the outside of the conductive disk 5 to the axis in sequence, an insulating plastic cover 9 is fixedly connected to the surface of the insulating tube 6, a sealing metal cover 10 is fixedly connected to the top surface of the insulating tube 6, a puncture needle 11 is movably connected to the surface of the sealing metal cover 10, a vent valve 12 is arranged on the inner wall of the sealing metal cover 10, the bottom surface of the vent valve 12 is movably connected to the top of the cell rod 8, a positive electrode spring 13 is movably connected to the top surface of the positive electrode spring 13, an electrode movable plate 14 is fixedly connected to the top surface of the positive electrode spring 13, and a movable plate 14 adapted to the electrode movable plate 14 is provided on the top surface of the cell shell 1 The inner wall of the electrode movable plate 14 is inlaid with a conductive long plate 15, and the top surface of the battery cell shell 1 is inlaid with a conductive short plate 16. One end of the conductive long plate 15 overlaps the surface of the conductive short plate 16. The top surface of the battery cell shell 1 is fixedly connected with a power-off protection cover 17, and the inner wall of the power-off protection cover 17 is fixedly connected with an insulating bag 18. The interior of the insulating bag 18 is provided with insulating oil. Through the piercing needle 11 and the insulating bag 18, after the insulating liquid in the insulating tube 6 is heated and expanded, the gas is discharged from the vent valve 12 to the sealed metal cover 10, and the sealed metal cover 10 can be subjected to an expansion force, so that the piercing needle 11 can gradually extend to the insulating bag 18, piercing the insulating bag 18, and the insulating oil flows out, and the sealed metal cover 10 can continue to push out the electrode movable plate 14, and the conductive long plate 15 and the conductive short plate 16 can be separated, so that the expanded battery is disconnected from the battery cell and will not be used anymore, thereby achieving the effect of reducing the safety hazards of batteries in the power bank.

[0025] The difference between Example 2 and Example 1 is that a rubber cover 19 is fixedly connected to the inner wall of the sealed metal cover 10, and a movable push plate 20 is fixedly connected to the surface of the rubber cover 19, and the top surface of the movable push plate 20 is fixedly connected to the bottom end of the puncture needle 11. Through the rubber cover 19 and the movable push plate 20, after the sealed metal cover 10 is filled with gas, the movable push plate 20 can be forced to move upward, and at the same time, the rubber cover 19 ensures that the internal gas will not leak to the outside of the sealed metal cover 10, so that when the sealed metal cover 10 does not push out the electrode movable plate 14, the puncture needle 11 can move up in advance to puncture the insulating bag 18, thereby ensuring the normal expansion of the subsequent sealed metal cover 10, thereby achieving the effect of ensuring the normal operation of the function of reducing the safety hazard of the battery cell in the event of an accident.

[0026] The difference between Example 3 and Example 2 is that the number of the insulating package 18 and the number of the battery core rods 8 are both four.

[0027] The difference between Example 4 and Example 3 is that four insulating packages 18 and the battery rods 8 are evenly distributed inside the battery shell 1 and the power-off protection cover 17, and the inner wall of the power-off protection cover 17 is fixedly connected with an isolation plate 21, and the number of the isolation plates 21 is three.

[0028] The difference between Example 5 and Example 4 is that the three isolation plates 21 are evenly distributed between the four insulation packages 18, so that a single insulation package 18 can correspond to a single battery as a whole, and when one battery as a whole is damaged, it will not affect the use of other battery as a whole.

[0029] The difference between Example 6 and Example 5 is that through holes matching with the needles 11 are formed on the surfaces of the conductive long plate 15 and the electrode movable plate 14 .

[0030] The difference between Example 7 and Example 6 is that the needle 11 is located directly below the insulation bag 18 so that it can be accurately and correctly inserted into the insulation bag 18 to ensure smooth leakage of the insulating oil inside the insulation bag 18.

[0031] The difference between Example 8 and Example 7 is that the insulating package 18 is made of a PPE plastic, and the surface of the battery cell shell 1 is fixedly connected with a battery cell protection cover 22 by screws, so as to ensure the insulation and firmness of the entire device.

[0032] Embodiment 9: A protection method for 18650 lithium battery cells with a protection function, characterized in that: if gas appears in the insulating tube, the battery expands as a whole, and at this time, the gas enters into the sealed metal cover through the vent valve, pushing the movable push plate upward, and at this time the needle can be moved up to the insulating package, the needle will pierce the insulating package, and the insulating oil will flow out and flow into the cell shell along the gap between the conductive long plate and the conductive short plate, so that the conductive short plate and the conductive long plate are fully separated and insulated, and the sealed metal cover continues to expand to push the electrode movable plate into the sealed metal cover, and the electrode movable plate drives the conductive long plate to move up, so that the conductive short plate and the conductive long plate are separated and staggered, and the swollen battery is separated from the cell.

[0033] When using the present invention, if a large amount of gas appears in the insulating tube 6, causing the battery to expand as a whole, the gas enters the sealed metal cover 10 through the vent valve 12, and then the movable push plate 20 is pushed upward. At this time, the puncture needle 11 can be moved up to the insulating bag 18. After rising to a certain level, the pressure in the sealed metal cover 10 is too high, and the puncture needle 11 will pierce the insulating bag 18, and the insulating oil will flow out and flow into the battery cell shell 1 along the gap between the conductive long plate 15 and the conductive short plate 16, so that the conductive short plate 16 and the conductive long plate 15 are fully separated and insulated. The sealed metal cover 10 then continues to expand and pushes the electrode movable plate 14 into the sealed metal cover 10. The electrode movable plate 14 drives the conductive long plate 15 to move upward, so that the conductive short plate 16 and the conductive long plate 15 are separated and staggered, and the swollen battery is separated from the battery cell. If the user does not find it, it will not continue to be used, thereby reducing the risk of use.

[0034] The above is only an embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A 18650 lithium battery cell with a protective function, comprising a cell shell (1), characterized in that: The inner wall of the battery cell shell (1) is fixedly connected to a partition plate (2), the inner wall of the battery cell shell (1) is inlaid with a negative electrode plate (3), the top surface of the negative electrode plate (3) is movably connected to a battery pad (4), the top surface of the battery pad (4) is movably connected to a conductive disk (5), the top surface of the conductive disk (5) is fixedly connected to an insulating tube (6), an electrolyte paper roll (7) and a battery rod (8) in sequence from the outside of the conductive disk (5) to the axis, the surface of the insulating tube (6) is fixedly connected to an insulating plastic cover (9), the top surface of the insulating tube (6) is fixedly connected to a sealing metal cover (10), the surface of the sealing metal cover (10) is movably connected to a puncture needle (11), the inner wall of the sealing metal cover (10) is provided with a vent valve (12), the vent valve (12) 2) is movably connected to the top of the battery rod (8), the top surface of the sealing metal cover (10) is movably connected to the positive spring (13), the top surface of the positive spring (13) is fixedly connected to the electrode movable plate (14), the top surface of the battery shell (1) is provided with a movable groove adapted to the electrode movable plate (14), the inner wall of the electrode movable plate (14) is inlaid with a conductive long plate (15), the top surface of the battery shell (1) is inlaid with a conductive short plate (16), one end of the conductive long plate (15) overlaps the surface of the conductive short plate (16), the top surface of the battery shell (1) is fixedly connected to a power-off protection cover (17), the inner wall of the power-off protection cover (17) is fixedly connected to an insulating bag (18), and the insulating bag (18) is provided with insulating oil inside; If gas appears in the insulating tube, the battery expands as a whole. At this time, the gas enters the sealed metal cover through the vent valve, pushing the movable push plate upward. At this time, the needle can be moved up to the insulating package, and the needle will pierce the insulating package. The insulating oil flows out and flows into the battery cell shell along the gap between the conductive long plate and the conductive short plate, fully separating and insulating the conductive short plate from the conductive long plate. The sealed metal cover then continues to expand and pushes the electrode movable plate into the sealed metal cover. The electrode movable plate drives the conductive long plate to move up, so that the conductive short plate and the conductive long plate are separated and staggered, and the swollen battery is separated from the battery cell.

2. The 18650 lithium battery cell with protection function according to claim 1, characterized in that: The inner wall of the sealing metal cover (10) is fixedly connected to a rubber cover (19), the surface of the rubber cover (19) is fixedly connected to a movable push plate (20), and the top surface of the movable push plate (20) is fixedly connected to the bottom end of the puncture needle (11).

3. The 18650 lithium battery cell with protection function according to claim 1, characterized in that: The number of the insulating package (18) and the number of the electric core rods (8) are both four.

4. The 18650 lithium battery cell with protection function according to claim 1, characterized in that: The four insulating packages (18) and the battery core rod (8) are evenly distributed inside the battery core shell (1) and the power-off protection cover (17).

5. The 18650 lithium battery cell with protection function according to claim 1, characterized in that: The surfaces of the conductive long plate (15) and the electrode movable plate (14) are both provided with through holes adapted to the puncture needles (11).

6. The 18650 lithium battery cell with protection function according to claim 1, characterized in that: The piercing needle (11) is located directly below the insulating bag (18).

7. The 18650 lithium battery cell with protection function according to claim 1, characterized in that: A battery cell protection cover (22) is fixedly connected to the surface of the battery cell shell (1) by means of screws.

8. The 18650 lithium battery cell with protection function according to claim 1, characterized in that: An isolation plate (21) is fixedly connected to the inner wall of the power-off protection cover (17), and the number of the isolation plates (21) is three.

9. The 18650 lithium battery cell with protection function according to claim 1, characterized in that: The three isolation plates (21) are evenly distributed between the four insulation packs (18).

10. A protection method for a 18650 lithium battery cell with a protection function as claimed in any one of claims 1 to 9, characterized in that: If gas appears in the insulating tube, the battery expands as a whole. At this time, the gas enters the sealed metal cover through the vent valve, pushing the movable push plate upward. At this time, the needle can be moved up to the insulating package, and the needle will pierce the insulating package. The insulating oil flows out and flows into the battery cell shell along the gap between the conductive long plate and the conductive short plate, fully separating and insulating the conductive short plate from the conductive long plate. The sealed metal cover then continues to expand and pushes the electrode movable plate into the sealed metal cover. The electrode movable plate drives the conductive long plate to move up, so that the conductive short plate and the conductive long plate are separated and staggered, and the swollen battery is separated from the battery cell.

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