阅读说明：本技术 一种具有保护功能的18650锂电池电芯及保护方法 (18650 lithium battery cell with protection function and protection method ) 是由 李国光 徐海奇 周佳荣 杨飞 贾金 赵军凡 徐家闯 韩琳琳 董大远 于 2019-10-29 设计创作，主要内容包括：本发明公开了一种具有保护功能的18650锂电池电芯及保护方法,包括电芯壳,电芯壳的内壁固定连接有分隔板,电芯壳的内壁镶嵌有负极电板,负极电板的顶面活动连接有电池垫板,电池垫板的顶面活动连接有导电盘,导电盘的顶面由导电盘外部至轴心依次固定连接有绝缘管、电解液纸卷与电芯杆,绝缘管的表面固定连接有绝缘塑料罩,绝缘管的顶面固定连接有密封金属罩,密封金属罩的表面活动连接有刺针,密封金属罩的内壁设置有泄气阀；本发明通过刺针与绝缘包,使得在绝缘管中的绝缘液受热膨胀后,膨胀后的电池从电芯中断开,不会继续使用,达到了降低充电宝中电池安全隐患的效果。(The invention discloses a 18650 lithium battery cell with a protection function and a protection method, the protection method comprises a cell shell, wherein the inner wall of the cell shell is fixedly connected with a partition plate, the inner wall of the cell shell is embedded with a negative electrode electroplate, the top surface of the negative electrode electroplate is movably connected with a battery backing plate, the top surface of the battery backing plate is movably connected with a conductive disc, the top surface of the conductive disc is sequentially and fixedly connected with an insulating tube, an electrolyte paper roll and a cell rod from the outside of the conductive disc 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 sealed metal cover, the surface of the sealed metal cover is movably connected with a felting; according to the invention, through the puncture needle and the insulation bag, after the insulation liquid in the insulation tube is heated and expanded, the expanded battery is disconnected from the battery core and cannot be used continuously, so that the effect of reducing the potential safety hazard of the battery in the charger is achieved.)

1. The utility model provides a 18650 lithium cell electricity core with protect function, includes electricity core shell (1), its characterized in that: the inner wall fixedly connected with division board (2) of electricity core shell (1), the inner wall of electricity core shell (1) is inlayed and is had negative pole electroplax (3), the top surface swing joint of negative pole electroplax (3) has battery backing plate (4), the top surface swing joint of battery backing plate (4) has electrically conductive dish (5), the top surface of electrically conductive dish (5) is by electrically conductive dish (5) outside to axle center fixedly connected with insulating tube (6), electrolyte scroll (7) and electric core pole (8) in proper order, the fixed surface of insulating tube (6) is connected with insulating plastic cover (9), the top surface fixedly connected with sealed metal covering (10) of insulating tube (6), the surface swing joint of sealed metal covering (10) has felting needle (11), the inner wall of sealed metal covering (10) is provided with snuffle valve (12), the bottom surface and the top swing joint of electric core pole (8) of snuffle valve (12), the top surface swing joint of sealed metal cover (10) has anodal spring (13), the top surface fixedly connected with electrode fly leaf (14) of anodal spring (13), the movable groove with electrode fly leaf (14) looks adaptation is seted up to the top surface of electricity core shell (1), the inner wall of electrode fly leaf (14) is inlayed and is had electrically conductive long slab (15), the top surface of electricity core shell (1) is inlayed and is had electrically conductive short slab (16), the one end of electrically conductive long slab (15) and the surface overlap joint of electrically conductive short slab (16), the top surface fixedly connected with outage safety cover (17) of electricity core shell (1), the insulating package (18) of inner wall fixedly connected with of outage safety cover (17), the inside of insulating package (18) is provided with insulating oil.

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

3. The 18650 lithium battery cell with protection function of claim 2, characterized in that: the number of the insulating packages (18) and the number of the electric core rods (8) are four.

4. The 18650 lithium battery cell with protection function of claim 3, characterized in that: the four insulating packages (18) and the electric core rod (8) are uniformly distributed in the electric core shell (1) and the power-off protection cover (17).

5. The 18650 lithium battery cell with protection function of claim 4, characterized in that: the surfaces of the conductive long plate (15) and the electrode movable plate (14) are provided with through holes matched with the puncture needles (11).

6. The 18650 lithium battery cell with protection function of claim 5, characterized in that: the puncture needle (11) is positioned right below the insulating bag (18).

7. The 18650 lithium battery cell with protection function of claim 6, characterized in that: the surface of the electric core shell (1) is fixedly connected with an electric core protective cover (22) through screws.

8. The 18650 lithium battery cell with protection function of claim 7, characterized in that: the inner wall fixedly connected with division board (21) of outage safety cover (17), the quantity of division board (21) is three.

9. The 18650 lithium battery cell with protection function of claim 8, characterized in that: the three partition plates (21) are uniformly distributed among the four insulation bags (18).

10. A18650 lithium battery electric core protection method with protect function, characterized by that: if appear gaseously in the insulating tube, the battery is whole to expand, gas enters into to sealed metal covering through the snuffle valve this moment, with the push pedal upwards promotion of activity, the felting needle can shift up to on the insulating package this moment, the felting needle can prick the insulating package promptly, insulating oil flows out, and along with the gap between the electrically conductive short slab of electrically conductive long slab flows into to the electricity core shell, it is insulating to fully separate electrically conductive short slab and electrically conductive long slab, sealed metal covering continues the inflation afterwards and pushes up the electrode fly leaf to sealed metal covering in, the electrode fly leaf drives electrically conductive long slab promptly and shifts up, make electrically conductive short slab and electrically conductive long slab separate stagger, separate the battery with the inflation from electric core.

Technical Field

The invention relates to the technical field of lithium batteries, in particular to a 18650 lithium battery electric core with a protection function and a protection method.

Background

18650 lithium cell is 18mm in diameter, and length is 65 mm's cylindrical lithium cell, because 18650 lithium cells have the advantages such as big, the stability is good, environmental protection and no memory effect, consequently is used in various electronic equipment such as notebook computer and treasured that charges extensively.

Current 18650 lithium cell often can many be used together even in the treasured that charges, the lithium cell that links together also often is called electric core, when 18650 electric core that the lithium cell constitutes met pressure or appeared the short circuit, the inside 18650 lithium cell of electric core can appear the phenomenon of inflation, and the lithium cell after the inflation mostly can be hidden in equipment, is difficult for in time discovering, then bursts easily in the continuous use, has certain potential safety hazard.

Disclosure of Invention

Aiming at the defects of the prior art, the invention provides a 18650 lithium battery cell with a protection function and a protection method, which have the advantages of reducing potential safety hazards of the cell and solve the problems that the expansion of the battery cell after being heated or pressed in the prior art cannot be found in time and certain potential safety hazards exist in subsequent use.

The 18650 lithium battery cell with protection function of the invention, including the electric core shell, the inner wall of the electric core shell is fixedly connected with the splitter plate, the inner wall of the electric core shell is inlaid with the negative pole electroplate, the top surface of the negative pole electroplate is movably connected with the battery backing plate, the top surface of the battery backing plate is movably connected with the conductive disc, the top surface of the conductive disc is fixedly connected with the insulating tube, the electrolyte scroll and the electric core bar from the outside of the conductive disc to the axle center in turn, the surface of the insulating tube is fixedly connected with the insulating plastic cover, the top surface of the insulating tube is fixedly connected with the sealed metal cover, the surface of the sealed metal cover is movably connected with the felting needle, the inner wall of the sealed metal cover is provided with the air escape valve, the bottom surface of the air escape valve is movably connected with the top end of the electric core rod, the top surface of the sealed metal cover, the inner wall of electrode fly leaf is inlayed and is had electrically conductive long slab, and the top surface of electricity core shell is inlayed and is had electrically conductive short slab, the one end of electrically conductive long slab and the surperficial overlap joint of electrically conductive short slab, the top surface fixedly connected with outage safety cover of electricity core shell, the insulating package of inner wall fixedly connected with of outage safety cover, the inside of insulating package is provided with insulating oil.

The 18650 lithium battery cell with protect function of the invention, wherein the inner wall of the sealed metal cover is fixedly connected with the rubber cover, the surface of the rubber cover is fixedly connected with the movable push plate, the top surface of the movable push plate is fixedly connected with the bottom end of the felting needle.

The 18650 lithium battery electric core with protect function of the invention, wherein the number of insulating package and electric core pole is four.

According to the 18650 lithium battery cell with the protection function, four insulation bags and a cell rod are uniformly distributed in a cell shell and a power-off protection cover.

According to the 18650 lithium battery cell with the protection function, through holes matched with the felting needles are formed in the surfaces of the conductive long plate and the electrode movable plate.

The 18650 lithium battery cell with protect function of the invention, wherein the felting needle is located right below the insulating bag.

The 18650 lithium battery cell with protection function of the invention, wherein the insulating bag is made of PPE plastic, the surface of the cell shell is fixedly connected with a cell protective cover through screws.

The 18650 lithium battery cell with protect function of the invention, wherein the inner wall of the power-off protective cover is fixedly connected with the division board, the number of the division board is three.

According to the 18650 lithium battery cell with the protection function, three partition plates are uniformly distributed among four insulation bags.

A18650 lithium battery electric core protection method with protect function, characterized by that: if appear gaseously in the insulating tube, the battery is whole to expand, gas enters into to sealed metal covering through the snuffle valve this moment, with the push pedal upwards promotion of activity, the felting needle can shift up to on the insulating package this moment, the felting needle can prick the insulating package promptly, insulating oil flows out, and along with the gap between the electrically conductive short slab of electrically conductive long slab flows into to the electricity core shell, it is insulating to fully separate electrically conductive short slab and electrically conductive long slab, sealed metal covering continues the inflation afterwards and pushes up the electrode fly leaf to sealed metal covering in, the electrode fly leaf drives electrically conductive long slab promptly and shifts up, make electrically conductive short slab and electrically conductive long slab separate stagger, separate the battery with the inflation from electric core.

Compared with the prior art, the invention has the following beneficial effects:

1. according to the invention, through the puncture needle and the insulating bag, after the insulating liquid in the insulating tube is heated and expanded, gas is discharged from the air escape valve into the sealing metal cover, the sealing metal cover can be subjected to an expansion force, so that the puncture needle can be gradually extended to the insulating bag to puncture the insulating bag, insulating oil flows out, the sealing metal cover can continuously eject the electrode movable plate, and the conductive long plate and the conductive short plate can be separated, so that the expanded battery is disconnected from the battery core and cannot be continuously used, and the effect of reducing the potential safety hazard of the battery in the charger is achieved.

2. According to the invention, through the rubber cover and the movable push plate, after the sealing metal cover is filled with gas, the movable push plate can move upwards under stress, and meanwhile, the rubber cover ensures that the internal gas cannot leak to the outside of the sealing metal cover, so that when the sealing metal cover does not push out the electrode movable plate, the pricking pin can move upwards in advance to puncture the insulating package, the normal expansion of the subsequent sealing metal cover is ensured, and the effect of ensuring the normal work of the function of reducing the potential safety hazard of the battery cell is achieved when an accident occurs.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:

fig. 1 is a schematic diagram of a front cross-sectional structure of a 18650 lithium battery cell with a protection function;

FIG. 2 is an enlarged schematic view of the structure at A in FIG. 1;

fig. 3 is an enlarged schematic view of B in fig. 1.

In the figure: 1. an electrical core shell; 2. a partition plate; 3. a negative electrode plate; 4. a battery backing plate; 5. a conductive plate; 6. an insulating tube; 7. electrolyte paper rolls; 8. an electric core bar; 9. an insulating plastic cover; 10. sealing the metal cover; 11. a needle; 12. a gas release valve; 13. a positive electrode spring; 14. an electrode active plate; 15. a conductive long plate; 16. a conductive shorting plate; 17. a power-off protection cover; 18. insulating bags; 19. a rubber cover; 20. a movable push plate; 21. a separator plate; 22. and (5) protecting the battery cell.

Detailed Description

Embodiments of the invention are disclosed in the following drawings: