Safe explosion-proof lithium battery

Abstract

The utility model provides a safe explosion-proof lithium battery which comprises a battery inner core arranged in a shell, a cover plate arranged at the top end of the shell of the lithium battery, a pressure relief column sleeved at the opening position of a pressure relief hole formed in the end face of the cover plate through the opening position of a through groove formed in the bottom end, and a pressure relief mechanism arranged on the pressure relief column, a plurality of pressure relief openings which are arranged in a circumferential array and are communicated with the interior of the through groove are formed in the side surface of the pressure relief column; the pressure relief mechanism comprises a sealing strip which is arranged in the pressure relief opening in a penetrating mode, a rubber layer arranged on the side face of the sealing strip, and a sealing disc which is arranged at the opening position of the through groove in a penetrating mode and covers the opening position of the pressure relief hole, wherein the top end of the sealing strip is rotationally connected with the opening wall of the side, away from the cover plate, of the pressure relief opening. The linkage assembly is arranged on the sealing disc and connected with the side faces of the bottom ends of the multiple sealing strips. According to the lithium battery, the internal pressure of the lithium battery body can be quickly released, and the lithium battery is prevented from being contacted with air after the internal pressure of the lithium battery is completely released.

Description

TECHNICAL FIELD

[0001] The utility model relates to lithium battery technical field, concretely is a safe explosion -proof lithium battery. BACKGROUND

[0002] Lithium battery is a kind of with lithium metal or lithium alloy as negative electrode material, using non-aqueous electrolyte solution primary battery, and it is not the same with rechargeable battery lithium ion battery and lithium ion polymer battery, lithium battery as a kind of reaction efficiency high, safety, small volume energy battery, application is more and more widely, the rapid development of power lithium battery in recent years, whether production process or material technology improvement, or the advantage of price, there is considerable breakthrough, therefore it also lays a solid foundation for multiple parallel and multiple series. The era of replacing lead-acid battery is getting closer and closer. Whether electric bicycle or backup power supply, its market share also begins to expand wildly, which is an undeniable fact. Then, in order to the safety and life of battery, the effective protection of lithium battery is also indispensable.

[0003] Due to the use of high-energy chemical substances and energy concentration, the safety performance of high-energy batteries has not been completely solved, for example, lithium ion batteries often short-circuit due to extrusion, collision or other accidents during charging, discharging or use. When thermal runaway occurs inside the battery pack, the violent chemical reaction inside the battery cell releases a large amount of heat, smoke and gas, causing the internal pressure of the battery pack to be much higher than the external environment pressure, resulting in a pressure difference. If the pressure cannot be quickly released, an explosion will occur, causing a safety accident. CONTENT OF THE UTILITY MODEL

[0004] In view of the above technical problems, the utility model provides a safe explosion -proof lithium battery, which can quickly release the internal pressure of the lithium battery body, and avoid the contact between the lithium battery and air after the internal pressure is completely released.

[0005] To achieve the above purpose, the utility model provides the following technical scheme: a safe explosion -proof lithium battery, including lithium battery shell, the battery inner core being arranged in the shell, the cover plate being arranged on the top end of lithium battery shell, the pressure relief column being arranged on the opening position of the through groove of the bottom end and the opening position of the pressure relief hole being arranged on the end face of the cover plate, and the pressure relief mechanism being arranged on the pressure relief column, a plurality of pressure relief openings are arranged on the side surface of the pressure relief column in a circumferential array and are communicated with the inside of the through groove, the pressure relief mechanism includes a sealing strip arranged in the pressure relief opening and rotationally connected to the side wall of the pressure relief opening away from the cover plate, a rubber layer arranged on the side surface of the sealing strip, a sealing disc arranged in the opening position of the through groove and covering the opening position of the pressure relief hole, and a linkage assembly arranged on the sealing disc and connected to the bottom end side surface of the plurality of sealing strips. When the sealing disc moves away from the cover plate in the through groove, the sealing disc drives the bottom end of the plurality of sealing strips to move away from each other through the linkage assembly.

[0006] Preferably, the through groove bottom wall is provided with a through hole.

[0007] Preferably, the pressure relief mechanism further comprises a fixed rod vertically fixed on the through groove bottom wall, a fixed block fixed on the fixed rod near one end of the sealing disc and parallel to the sealing disc, and an elastic assembly arranged between the fixed block and the sealing disc, wherein the sealing disc end face is tightly attached to the pressure relief hole opening position when the elastic assembly is in a normal elongation state.

[0008] Preferably, the elastic assembly comprises a telescopic rod penetrating between the sealing disc and the fixed block and having two ends respectively connected to the adjacent end faces of the sealing disc and the fixed block, and two limit springs movably sleeved on the telescopic rod and respectively fixed on the adjacent end faces of the sealing disc and the fixed block, wherein the sealing disc is tightly attached to the pressure relief hole opening position when the limit springs are in a normal elongation state.

[0009] Preferably, the elastic assembly comprises a telescopic rod penetrating between the sealing disc and the fixed block and having two ends respectively connected to the adjacent end faces of the sealing disc and the fixed block, and two magnets movably sleeved on the telescopic rod and respectively fixed on the adjacent end faces of the sealing disc and the fixed block, wherein the adjacent end poles of the two magnets are the same, and the sealing disc is tightly attached to the pressure relief hole opening position.

[0010] Preferably, the sealing strip is provided with a sliding groove along the vertical direction on the side surface near the telescopic rod rod body, and the distance between the sliding groove opening position and the telescopic rod rod body gradually decreases from bottom to top, and the linkage assembly comprises a sliding block having one end slidingly penetrating in the sliding groove and the other end rotatably connected to the side surface of the sealing disc.

[0011] Preferably, the sealing disc bottom end face is provided with a sealing ring.

[0012] The utility model discloses a lithium battery pressure relief device, which comprises a through groove, a sealing disc movably arranged in the through groove, a plurality of sealing strips rotatably connected to the sealing disc, a pressure relief hole arranged on the sealing disc, and a linkage assembly arranged between the sealing disc and the sealing strips. BRIEF DESCRIPTION OF DRAWINGS

[0013] The accompanying drawings are used to provide further understanding of the present application, and constitute a part of the specification, and are used to explain the present application together with embodiments of the present application, and do not constitute a limitation to the present application, and in the drawings:

[0014] Figure 1 The simple structure schematic diagram of the safety explosion-proof lithium battery cover plate and the pressure relief column is provided for the present application.

[0015] Figure 2 The pressure relief column structure schematic diagram is for the present application.

[0016] Figure 3 The pressure relief column cross section structure schematic diagram is for the present application.

[0017] Figure 4 The pressure relief column cross section structure schematic diagram is for the present application.

[0018] Figure 5 The pressure relief column pressure relief state structure schematic diagram is for the present application.

[0019] In the drawing: 1, cover plate; 2, pressure relief hole; 3, pressure relief column; 4, pressure relief port; 5, sealing strip; 6, through groove; 7, through hole; 8, sealing disc; 9, sealing ring; 10, sliding groove; 11, sliding block; 12, fixed rod; 13, fixed block; 14, telescopic rod; 15, limiting spring. DETAILED DESCRIPTION

[0020] In order to make the technical means, creative features, purposes and effects realized by the present application easy to understand, the present application is further described below in combination with specific embodiments and drawings, but the following embodiments are only preferred embodiments of the present application, not all. Based on the embodiments in the embodiments, other embodiments obtained by those skilled in the art without creative labor all belong to the protection scope of the present application.

[0021] Please refer to Figures 1-5The utility model provides a safe explosion -proof lithium battery, including lithium battery shell, the battery core that sets up in the shell, the cover plate 1 that sets up on the top end of lithium battery shell, the relief column 3 of through the bottom end opening through groove 6 opening position sleeve setting in the cover plate 1 end face opening pressure relief hole 2 opening position, and the pressure relief mechanism that sets up on the relief column 3, relief column 3 side face is equipped with multiple and is arranged in the circumferential array and with the through hole 4 of through groove 6 inside through pressure relief, pressure relief mechanism includes the sealing strip 5 of being set up in the through hole 4 and top end rotationally connected the mouth wall of through hole 4 far from the cover plate 1 side, the rubber layer of setting up on the sealing strip 5 side face, the sealing disc 8 of being set up in the opening position of through groove 6 and covering in the opening position of pressure relief hole 2, and the linkage assembly of setting up on the sealing disc 8 and being connected with the bottom end side face of multiple sealing strip 5, when sealing disc 8 moves in the through groove 6 to the direction far from the cover plate 1, sealing disc 8 moves mutually far away through linkage assembly and drives the bottom end of multiple sealing strip 5.

[0022] As Figures 1-5 The lithium battery body appears short circuit damage, causing a large amount of heat, smoke and gas to be released inside the lithium battery body. At this time, the internal pressure of the two lithium battery bodies increases, pushing the sealing disc 8 attached to the opening position of the pressure relief hole 2 to move upward. The upward movement of the sealing disc 8 simultaneously drives the bottom ends of the multiple sealing strips 5 to move away from each other through the linkage assembly, facilitating the discharge of the heat, smoke and gas inside the lithium battery body through the pressure relief hole 2, the through groove 6 and the pressure relief port 4 outside the relief column 3. This facilitates the discharge of the heat, smoke and gas inside the lithium battery body. After the heat, smoke and gas inside the lithium battery body are discharged, the internal pressure of the lithium battery body decreases. At this time, the sealing disc 8 will reattach to the opening position of the pressure relief hole 2 under the action of the elastic assembly, preventing external air from entering the lithium battery body through the pressure relief hole 2, causing the lithium battery body to continue to react and damage. This can quickly release the internal pressure of the lithium battery body and avoid the contact of the lithium battery with air after the complete release of the internal pressure.

[0023] The bottom wall of the through groove 6 is provided with a through hole 7.

[0024] As Figures 2-5 When the internal pressure of the lithium battery body is too high, a part of the smoke and gas is directly discharged through the through hole 7, and a part of the smoke and gas is discharged through the opened pressure relief port 4 by pushing the sealing disc 8 to move upward and driving the bottom ends of the multiple sealing strips 5 to move away from each other.

[0025] The pressure relief mechanism further includes a fixed rod 12 vertically fixedly arranged on the bottom wall of the through groove 6, a fixed block 13 fixedly arranged on the end of the fixed rod 12 close to the sealing disc 8 and parallel to the sealing disc 8, and an elastic assembly arranged between the fixed block 13 and the sealing disc 8. When the elastic assembly is in a normal elongation state, the end face of the sealing disc 8 is tightly attached to the opening position of the pressure relief hole 2.

[0026] The elastic assembly comprises a telescopic rod 14 arranged between the sealing disc 8 and the fixed block 13 and connected to the adjacent end faces of the sealing disc 8 and the fixed block 13, respectively, and a limiting spring 15 movably sleeved on the telescopic rod 14 and connected to the adjacent end faces of the sealing disc 8 and the fixed block 13, respectively. When the limiting spring 15 is in a normal elongation state, the sealing disc 8 is tightly attached to the opening position of the pressure relief hole 2.

[0027] The elastic assembly comprises a telescopic rod 14 arranged between the sealing disc 8 and the fixed block 13 and connected to the adjacent end faces of the sealing disc 8 and the fixed block 13, respectively, and two magnets movably sleeved on the telescopic rod 14 and fixedly arranged on the adjacent end faces of the sealing disc 8 and the fixed block 13, respectively. The adjacent end faces of the two magnets have the same magnetic pole, and the sealing disc 8 is tightly attached to the opening position of the pressure relief hole 2.

[0028] As shown in Figures 1-5 When the lithium battery body is damaged and releases a large amount of heat, smoke and gas, the internal pressure of the lithium battery body increases, the sealing disc 8 is pushed to move upward, the limiting spring 15 sleeved on the telescopic rod 14 is compressed, or the two magnets are close to each other, so that the pressure relief hole 2 is opened, and the heat, smoke and gas in the lithium battery body are discharged through the pressure relief hole 2 and the pressure relief opening 4. After the heat, smoke and gas are discharged, the internal pressure of the lithium battery body decreases, and the sealing disc 8 is tightly attached to the opening position of the pressure relief hole 2 under the elastic force of the limiting spring 15 or the repulsive force between the two magnets, so that the air in the outside cannot enter the lithium battery body through the pressure relief hole 2. The internal pressure of the lithium battery body can be quickly released, and the lithium battery body is prevented from being in contact with the air again after the internal pressure is completely released.

[0029] The sealing strip 5 is provided with a sliding groove 10 arranged in the vertical direction on the side surface adjacent to the telescopic rod 14, and the distance between the opening position of the sliding groove 10 and the telescopic rod 14 gradually decreases from bottom to top. The linkage assembly comprises a sliding block 11 slidably arranged in the sliding groove 10 and rotatably connected to the side surface of the sealing disc 8.

[0030] As shown in Figures 1-5 When the sealing disc 8 moves upward, the sliding block 11 arranged on the side surface of the sealing disc 8 slides in the sliding groove 10, and the top ends of the plurality of sealing strips 5 are rotatably connected to the top wall of the pressure relief opening 4, so that the bottom ends of the plurality of sealing strips 5 are rotated outward to open the pressure relief opening 4, so that the heat, smoke and gas generated in the lithium battery body can be discharged when the lithium battery body is damaged.

[0031] The sealing disc 8 is provided with a sealing ring 9 on the bottom end face.

[0032] When the bottom end of the sealing disc 8 is attached to the opening position of the pressure relief hole 2, the sealing ring 9 is in contact with the end face of the opening position of the pressure relief hole 2, thereby improving the sealing of the sealing disc 8 attached to the opening position of the pressure relief hole 2.

[0033] The basic principle, main features and advantages of the present application are shown and described above. It should be understood by those skilled in the art that the present application is not limited by the above examples, and the above examples and descriptions in the specification are only preferred examples of the present application and are not intended to limit the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A safe explosion-proof lithium battery, comprising a lithium battery housing, a battery core arranged in the housing, a cover plate (1) arranged on the top of the lithium battery housing, a pressure relief column (3) sleeved on the opening position of a pressure relief hole (2) provided on the end surface of the cover plate (1) through the opening position of a through groove (6) provided at the bottom thereof, and a pressure relief mechanism provided on the pressure relief column (3), characterized in that: The side of the pressure relief column (3) is provided with a plurality of pressure relief ports (4) arranged in a circumferential array and communicating with the interior of the through groove (6). The pressure relief mechanism comprises a sealing strip (5) which is arranged in the pressure relief port (4) and the top end of which is rotatably connected to the wall of the pressure relief port (4) away from the cover plate (1), a rubber layer arranged on the side of the sealing strip (5), a sealing disk (8) which is arranged in the opening position of the through groove (6) and covers the opening position of the pressure relief hole (2), and a linkage assembly arranged on the sealing disk (8) and connected to the bottom side of the plurality of sealing strips (5). When the sealing disk (8) moves in the through groove (6) in a direction away from the cover plate (1), the sealing disk (8) drives the bottom ends of the plurality of sealing strips (5) to move away from each other through the linkage assembly.

2. A safe explosion-proof lithium battery according to claim 1, characterized in that: A through hole (7) is provided on the bottom wall of the through groove (6).

3. A safe explosion-proof lithium battery according to claim 2, characterized in that: The pressure relief mechanism further comprises a fixing rod (12) fixedly arranged vertically on the bottom wall of the through groove (6), a fixing block (13) fixedly arranged on the fixing rod (12) adjacent to one end of the sealing disk (8) and parallel to the sealing disk (8), and an elastic component arranged between the fixing block (13) and the sealing disk (8); when the elastic component is in a normally extended state, the end surface of the sealing disk (8) is tightly fitted on the opening position of the pressure relief hole (2).

4. A safe explosion-proof lithium battery according to claim 3, characterized in that: The elastic component comprises a telescopic rod (14) which is inserted between the sealing disc (8) and the fixed block (13) and whose two ends are respectively connected to adjacent end faces of the sealing disc (8) and the fixed block (13); and a limit spring (15) which is movably sleeved on the rod body of the telescopic rod (14) and whose two ends are respectively connected to adjacent end faces of the sealing disc (8) and the fixed block (13). When the limit spring (15) is in a normally extended state, the sealing disc (8) is tightly fitted on the opening position of the pressure relief hole (2).

5. The safety and explosion-proof lithium battery according to claim 3, characterized in that: The elastic component comprises a telescopic rod (14) which is inserted between the sealing disk (8) and the fixed block (13) and whose two ends are respectively connected to the adjacent end faces of the sealing disk (8) and the fixed block (13); and two magnets which are movably sleeved on the rod body of the telescopic rod (14) and respectively fixedly arranged on the adjacent end faces of the sealing disk (8) and the fixed block (13). The magnetic poles of the adjacent ends of the two magnets are the same, and the sealing disk (8) is tightly fitted on the opening position of the pressure relief hole (2).

6. A safe explosion-proof lithium battery according to claim 4 or 5, characterized in that: A sliding groove (10) is provided on the side of the sealing strip (5) adjacent to the telescopic rod (14) and is opened in the vertical direction, and the distance between the opening position of the sliding groove (10) and the telescopic rod (14) gradually decreases from bottom to top. The linkage component includes a slider (11) with one end slidingly inserted into the sliding groove (10) and the other end rotatably connected to the side of the sealing disk (8).

7. The safe explosion-proof lithium battery according to claim 1, characterized in that: A sealing ring (9) is provided on the bottom end surface of the sealing disk (8).

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