Safe explosion-proof lithium ion battery

Abstract

The invention relates to the field of lithium ion batteries, in particular to a safe anti-explosion lithium ion battery which comprises a protection mechanism, and the protection mechanism is used for performing fire extinguishing and cooling treatment on a lithium battery on fire or at an overhigh temperature; the anti-explosion mechanism is used for eliminating bumps on the surface of the lithium battery; the outer side of each explosion-proof mechanism is provided with an inner shell, the center part of the inner shell is provided with a battery assembly, and the explosion-proof mechanisms are symmetrically arranged at the two ends of the battery assembly. According to the safe explosion-proof lithium ion battery, the top end of the safe explosion-proof lithium ion battery can be pulled outwards from the interiors of the two sides of the battery assembly through outward movement of the multi-folded plate; when the battery pack is in use, the battery pack is not limited by the parts and moves downwards, finally, the battery pack enters the central cavity of the hollow shell, and the cooling liquid in the cavities on the two sides of the hollow shell can cool the surface of the battery pack, so that explosion and spontaneous combustion are avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium ion batteries, in particular to a safe explosion-proof lithium ion battery. Background Art

[0002] Lithium-ion batteries are secondary batteries (rechargeable batteries) that rely primarily on the movement of lithium ions between the positive and negative electrodes. During the charge and discharge process, lithium ions are intercalated and deintercalated between the two electrodes. During charging, lithium ions are deintercalated from the positive electrode and then intercalated into the negative electrode through the electrolyte, leaving the negative electrode in a lithium-rich state. The reverse occurs during discharge.

[0003] Battery bulging is primarily caused by internal gas generation. This gas is primarily due to high temperatures and internal gas diffusion. Accumulation of these gases within the battery increases internal pressure, leading to bulging. Battery bulging is a precursor to thermal runaway, which can lead to explosions, combustion, and electrolyte leakage. It also reduces battery life and performance. Summary of the Invention

[0004] The present invention provides a safe and explosion-proof lithium-ion battery to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned object, the present invention provides the following technical solutions: a safe and explosion-proof lithium-ion battery, comprising a protection mechanism for extinguishing and cooling a lithium battery that is on fire or has an excessively high temperature; An explosion-proof mechanism, which is used to eliminate bulges on the surface of lithium batteries; An inner shell is provided on the outside of the explosion-proof mechanism, a battery assembly is provided at the center of the inner shell, and the explosion-proof mechanisms are symmetrically arranged at both ends of the battery assembly. The bottom of the inner shell is fixedly connected to the protection mechanism, and the outer shell is fixedly connected to the outside of the protection mechanism. A top cover is provided on the top of the outer shell; A top protective sleeve is provided on the top of the inner cavity of the inner shell, and side guard plates are symmetrically provided on both sides of the inner cavity of the inner shell; The protection mechanism includes a bottom sleeve, which is arranged at the bottom of the side guard plate. The outer side of the bottom sleeve is fixedly connected to a bottom connecting plate, which is slidably adapted to the side guard plate and fixedly connected to the inner shell.

[0006] Preferably, the bottom of the battery assembly is fixedly connected to a NiTi binary alloy plate, the bottom of the NiTi binary alloy plate is extruded and adapted with a straight plate, the bottom of the straight plate is fixedly connected to a trapezoidal bar, the outer side of the trapezoidal bar is slidably adapted with the bottom sheath, the bottom of the trapezoidal bar is extruded and adapted with an inclined panel, the end of the inclined panel away from the trapezoidal bar is fixedly connected to a multi-fold plate, and the number of the multi-fold plates is two.

[0007] Preferably, the bottom of the bottom protective sleeve and the bottom of the bottom connecting plate are fixedly connected to a hollow shell, wherein the interior of the hollow shell is divided into three cavities, the central cavity is hollow and empty, and the interiors of the two side cavities are fixedly connected to a capsule body, and cooling liquid is placed in the space below the capsule body and in the space surrounded by the side cavities of the hollow shell. The side cavities of the hollow shell and the surface of the capsule body are both connected to the multi-fold plate, and the end of the multi-fold plate away from the capsule body is inserted into the outside of the battery assembly.

[0008] Preferably, the explosion-proof mechanism includes an explosion-proof component, which is arranged on both ends of the battery component, and an intermediate sleeve is provided at the end of the explosion-proof component away from the battery component, and insertion rods are inserted at both ends of the intermediate sleeve, and the end of the insertion rod away from the intermediate sleeve is fixedly connected to the side guard plate, and a reflux component is provided on the side of the explosion-proof component, and the reflux component is arranged on the top of the bottom sleeve, and the outer sides of the explosion-proof component and the reflux component are fixedly connected with a small pump body, and the small pump body is fixedly connected to the top of the bottom connecting plate.

[0009] Preferably, the explosion-proof component includes an inner frame, which is fixedly connected to the top of the bottom sleeve. A movable plate is slidably adapted on one side of the inner frame close to the battery assembly, and a limiting plate is fixedly connected inside the inner frame.

[0010] Preferably, the side of the movable plate away from the battery assembly is fixedly connected with a short rod and an external rod, and the end of the short rod away from the movable plate is fixedly connected with a connecting piece. A spring is provided on the side of the short rod, one end of the spring is fixedly connected to the connecting piece, and the end of the spring away from the connecting piece is fixedly connected to the inner side of the inner frame.

[0011] Preferably, the end of the external connecting rod away from the movable plate is extruded and adapted to be fitted with a branch plate, both sides of the branch plate are fixedly connected with leak-proof spring plates, the end of the leak-proof spring plate away from the branch plate is fixedly connected with a cylinder, the outer side of the cylinder is fixedly connected with a cylinder sleeve, and both ends of the cylinder sleeve are fixedly connected to the side guard plates.

[0012] Preferably, the end of the cylinder away from the sleeve is fixedly connected to the small pump body, the inside of the cylinder is fixedly connected to the perforated disk, the inner side of the perforated disk is plugged with a mosaic block, the side of the mosaic block away from the perforated disk is fixedly connected to a plugging head, and the outer side of the plugging head is fixedly connected to the branch plate.

[0013] Preferably, the reflux assembly includes a support frame, which is fixedly connected to the top of the bottom sleeve, and the central part of the inner side of the support frame is rotatably connected to a flip flanking plate, and the outer end face of the flip flanking plate is fixedly connected to a rotary joint, and the end of the rotary joint away from the flip flanking plate is fixedly connected to a U-shaped rod, and the end of the U-shaped rod away from the rotary joint is fixedly connected to a tough piece, wherein the tough piece is extruded and adapted to the branch plate.

[0014] Preferably, the end of the flipping plate away from the rotary joint is fixedly connected to a bevel push plate, and the side of the bevel push plate close to the bottom sleeve is squeezed and adapted to be fitted with an insertion plate, the insertion plate is inserted into the surface of the inner frame and extends into the interior thereof, the outer side of the insertion plate is fixedly connected to a plate sleeve, the side of the plate sleeve away from the inner frame is fixedly connected to a return spring, and the end of the return spring away from the plate sleeve is fixedly connected to the bottom sleeve.

[0015] Preferably, a return pipe is fixedly connected to the bottom of the inner frame, one end of the return pipe away from the inner frame is fixedly connected to the small pump body, and the return pipe is sleeved on the surface of the bottom jacket.

[0016] Preferably, the interior of the inner frame is fixedly connected to a plate seat, the interior of the plate seat is rotatably connected to a flow blocking plate, both ends of the flow blocking plate and the end away from the plate seat are fixedly connected to anti-leakage plugs, and the outer side of the anti-leakage plug is squeezed and adapted to the inner wall of the inner frame.

[0017] Compared with the prior art, the present invention has the following beneficial effects: 1. As the multi-fold plate moves outward, its top end will be pulled out from the inside of both sides of the battery assembly. At this time, the battery assembly will not be restricted by the above components and will move downward. Finally, the battery assembly will enter the central cavity of the hollow shell. At this time, the coolant in the cavities on both sides of the hollow shell will cool the surface of the battery assembly to avoid explosion and spontaneous combustion.

[0018] 2. As the inclined panel and the multi-fold plate move outward, the inclined panel will be retracted into the cavities on both sides of the hollow shell. At this time, the compressed carbon dioxide liquid inside the capsule will be ejected from the junction of the inclined panel and the cavities on both sides of the hollow shell and enter the central cavity of the hollow shell, thereby playing the triple role of cooling the surface of the upper half of the battery assembly and extinguishing the spontaneous combustion area with carbon dioxide. At the same time, the emitting gas will alert the operator to a battery failure.

[0019] 3. The coolant inside the small pump body will enter the inner frame through the perforated disk and the cylinder respectively. The inner frame is set on both ends of the battery assembly. Therefore, the coolant inside it will cool down the bulging part of the positive electrode of the battery assembly, and at the same time avoid causing greater danger.

[0020] 4. The plug-in plate squeezes the flow blocking plate, causing it to deflect upward through the plate connector until the flow blocking plate and the leak-proof plug block the bottom of the inner cavity of the inner frame, so that the coolant flowing out of the cylinder will remain in the inner frame, thereby achieving the effect of cooling and eliminating the battery bulge. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 The figure is a schematic diagram of the external structure of a safe and explosion-proof lithium-ion battery of the present invention.

[0022] Figure 2 It is a schematic diagram of the overall cross-sectional structure of the present invention.

[0023] Figure 3 This is a schematic structural diagram of the first internal layer of the entire invention.

[0024] Figure 4 This is a schematic structural diagram of the second internal layer of the entire present invention.

[0025] Figure 5 It is a schematic diagram of the longitudinal structure of the protection mechanism of the present invention.

[0026] Figure 6 For the present invention Figure 5 Schematic diagram of the enlarged structure at point A in the middle.

[0027] Figure 7 It is a schematic cross-sectional structure diagram of the protection mechanism of the present invention.

[0028] Figure 8 It is a structural schematic diagram of the explosion-proof mechanism of the present invention.

[0029] Figure 9 It is a schematic structural diagram of the longitudinal section of the explosion-proof component of the present invention.

[0030] Figure 10 For the present invention Figure 9 Schematic diagram of the enlarged structure at point B in the middle.

[0031] Figure 11 It is a schematic cross-sectional structure diagram of some components of the explosion-proof assembly of the present invention.

[0032] Figure 12 It is a schematic diagram of the longitudinal cross-section structure of some components of the explosion-proof assembly of the present invention.

[0033] Figure 13 It is a structural schematic diagram of the reflux component of the present invention.

[0034] Figure 14 It is a schematic cross-sectional structural diagram of the reflux assembly of the present invention.

[0035] Figure 15 For the present invention Figure 14 Schematic diagram of the enlarged structure at point C in the middle.

[0036] In the figure: 1. outer shell; 2. top cover; 3. inner shell; 4. battery assembly; 5. protection mechanism; 6. explosion-proof mechanism; 7. side guard plate; 8. top jacket; 51. NiTi binary alloy plate; 52. straight plate; 53. trapezoidal bar; 54. inclined panel; 55. multi-fold plate; 56. hollow shell; 57. capsule; 58. bottom jacket; 59. bottom connecting plate; 61. explosion-proof assembly; 62. intermediate sleeve; 63. interpenetrating rod; 64. reflux assembly; 65. small pump body; 611. inner frame; 612. movable plate; 613. limit plate; 614. short rod; 615. Connecting piece; 616. Spring; 617. External connecting rod; 618. Branch plate; 619. Cylinder sleeve; 610. Cylinder; 6101. Perforated disk; 6102. Fitting block; 6103. Sealing head; 6104. Leak-proof spring; 641. Support frame; 642. Flip bend plate; 643. Rotary joint; 644. U-shaped rod; 645. Tough piece; 646. Inclined push plate; 647. Insert plate; 648. Plate sleeve; 649. Return spring; 640. Return pipe; 6401. Plate connector; 6402. Flow blocking plate; 6403. Leak-proof plug. DETAILED DESCRIPTION

[0037] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments. It should be noted that the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0038] See also Figures 1 to 15 , the present invention provides a technical solution: Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 and Figure 7 As shown, it includes a protection mechanism 5, which is used to extinguish and cool down the lithium battery that is on fire or has too high a temperature; An explosion-proof mechanism 6, which is used to eliminate bulges on the surface of the lithium battery; An inner shell 3 is provided on the outside of the explosion-proof mechanism 6, a battery assembly 4 is provided in the center of the inner shell 3, and the explosion-proof mechanism 6 is symmetrically arranged at both ends of the battery assembly 4. The bottom of the inner shell 3 is fixedly connected to the protection mechanism 5, and the outer shell 1 is fixedly connected to the outer shell 1. A top cover 2 is provided on the top of the outer shell 1; A top protective sleeve 8 is provided at the top of the inner cavity of the inner shell 3 , and side guard plates 7 are symmetrically provided on both sides of the inner cavity of the inner shell 3 .

[0039] The protection mechanism 5 includes a bottom protective sleeve 58, which is arranged at the bottom of the side guard plate 7. The outer side of the bottom protective sleeve 58 is fixedly connected to a bottom connecting plate 59, which is slidably fitted with the side guard plate 7 and fixedly connected to the inner shell 3. The bottom of the battery assembly 4 is fixedly connected to a NiTi binary alloy plate 51, and the bottom of the NiTi binary alloy plate 51 is extruded with a straight plate 52. The bottom of the straight plate 52 is fixedly connected to a trapezoidal bar 53, and the outer side of the trapezoidal bar 53 is slidably fitted with the bottom protective sleeve 58. The bottom of the trapezoidal bar 53 is extruded with an inclined panel 54, and the end of the inclined panel 54 away from the trapezoidal bar 53 is fixedly connected to a multi-fold plate 55, wherein the number of the multi-fold plates 55 is two. When the surface temperature of the battery assembly 4 is too high and exceeds a predetermined value, or when spontaneous combustion occurs, the NiTi binary alloy plate 51 provided at the bottom of the battery assembly 4 will be thermally bent, and the bent NiTi binary alloy plate 51 will bend downward and squeeze the straight plate 52, wherein the bottom of the straight plate 52 is connected to the trapezoidal bar 53, so the trapezoidal bar 53 will move downward and squeeze the inclined plate 54, wherein the contact surface between the trapezoidal bar 53 and the inclined plate 54 is an inclined surface, and the squeezed inclined plate 54 will carry the multi-fold plate 5 connected to the other end thereof. 5 moves outward, wherein the inclined plate 54, the trapezoidal bar 53, the straight plate 52 and the NiTi binary alloy plate 51 initially support and limit the top of the battery assembly 4. However, as the multi-fold plate 55 moves outward, its top end will be withdrawn from the interior of both sides of the battery assembly 4. At this time, the battery assembly 4 will not be restricted by the above-mentioned components and will move downward. Finally, the battery assembly 4 will enter the central cavity of the hollow shell 56. At this time, the coolant in the cavities on both sides of the hollow shell 56 will cool the surface of the battery assembly 4 to avoid explosion and spontaneous combustion.

[0040] The bottom of the bottom sheath 58 and the bottom connecting plate 59 are fixedly connected to the hollow shell 56, wherein the interior of the hollow shell 56 is divided into three cavities, the central cavity is hollow and empty, and the interiors of the two side cavities are fixedly connected to the capsule 57, and the coolant is placed in the space below the capsule 57 and in the space surrounded by the side cavities of the hollow shell 56. The side cavities of the hollow shell 56 and the surface of the capsule 57 are both connected to the multi-fold plate 55, and the end of the multi-fold plate 55 away from the capsule 57 is inserted into the outside of the battery assembly 4. At the same time, as the inclined panel 54 and the multi-fold plate 55 move outward, the inclined panel 54 will be retracted into the cavities on both sides of the hollow shell 56, wherein the side of the inclined panel 54 in contact with the trapezoidal bar 53 will coincide with the inner wall of the central cavity of the hollow shell 56, but the inclined portion of the inclined panel 54 is longer than the thickness of the central cavity of the hollow shell 56, that is, when the inclined panel 54 is not squeezed by the trapezoidal bar 53, it and the multi-fold plate 55 block and seal both sides of the hollow shell 56, wherein the capsule 57 is sleeved with the multi-fold plate 55, and the carbon dioxide compressed liquid inside the capsule 57 is above the multi-fold plate 55, but as the inclined panel 54 and the multi-fold plate 55 move outward, the compressed carbon dioxide liquid inside the capsule 57 is above the multi-fold plate 55. The outward movement of the plate 55 causes the multi-fold plate 55 to be pulled out from the capsule 57, and the inclined plate 54 will replace the multi-fold plate 55 and be inserted into the interior of the hollow shell 56 and the capsule 57 respectively, until the inclined portion of the inclined plate 54 is also inserted into the capsule 57. The capsule 57 has internal pressure, so the carbon dioxide compressed liquid inside the capsule 57 will be ejected from the junction of the cavities on both sides of the inclined plate 54 and the hollow shell 56, and enter the central cavity of the hollow shell 56, thereby playing the triple role of cooling the surface of the upper half of the battery assembly 4 and extinguishing the spontaneous combustion site with carbon dioxide. At the same time, the emitting gas will remind the operator that the battery has failed.

[0041] Because the inclined portion of the inclined panel 54 is longer than the thickness of the central cavity of the hollow shell 56, and the bending volume of the NiTi binary alloy plate 51 is limited, the trapezoidal bar 53 will not completely embed the inclined panel 54 into the capsule 57. Therefore, the compressed carbon dioxide liquid in the capsule 57 will be sprayed into the center of the hollow shell 56 along the inclined portion of the inclined panel 54.

[0042] like Figure 8 、 Figure 9 Figure 10, Figure 11 and Figure 12As shown, the explosion-proof mechanism 6 includes an explosion-proof component 61, which is arranged on both ends of the battery assembly 4. An intermediate sleeve 62 is provided at the end of the explosion-proof component 61 away from the battery assembly 4, and both ends of the intermediate sleeve 62 are inserted with insertion rods 63. The end of the insertion rod 63 away from the intermediate sleeve 62 is fixedly connected to the side guard plate 7, and a reflux component 64 is provided on the side of the explosion-proof component 61. The reflux component 64 is arranged on the top of the bottom sleeve 58. The outer sides of the explosion-proof component 61 and the reflux component 64 are fixedly connected with a small pump body 65, and the small pump body 65 is fixedly connected to the top of the bottom connecting plate 59.

[0043] The explosion-proof component 61 includes an inner frame 611, which is fixedly connected to the top of the bottom sleeve 58. The side of the inner frame 611 close to the battery assembly 4 is slidably adapted with a movable plate 612. The interior of the inner frame 611 is fixedly connected with a limiting plate 613. The side of the movable plate 612 away from the battery assembly 4 is respectively fixedly connected with a short rod 614 and an external rod 617. The end of the short rod 614 away from the movable plate 612 is fixedly connected with a connecting piece 615. A spring 616 is provided on the side of the short rod 614, one end of the spring 616 is fixedly connected to the connecting piece 615, and the end of the spring 616 away from the connecting piece 615 is fixedly connected to the inner side of the inner frame 611. There are several movable plates 612, limiting plates 613, short rods 614, connecting plates 615, springs 616 and external rods 617, and the movable plates 612 are arranged in a linear array on the inner frame 611. When a bulge occurs at any point on the positive or negative pole of the battery assembly 4, coolant will enter the interior of the inner frame 611 and cool the bulged part to eliminate the secondary bulge.

[0044] The end of the external rod 617 away from the movable plate 612 is squeezed and adapted to be fitted with a branch plate 618, and both sides of the branch plate 618 are fixedly connected with a leak-proof spring piece 6104, and the end of the leak-proof spring piece 6104 away from the branch plate 618 is fixedly connected to the cylinder 610, and the outer side of the cylinder 610 is fixedly connected with a cylinder sleeve 619, and both ends of the cylinder sleeve 619 are fixedly connected to the side guard plate 7, and the end of the cylinder 610 away from the cylinder sleeve 619 is fixedly connected to the small pump body 65, and the inside of the cylinder 610 is fixedly connected with a perforated disk 6101, and the inner side of the perforated disk 6101 is plugged with a fitting block 6102, and the side of the fitting block 6102 away from the perforated disk 6101 is fixedly connected with a plugging head 6103, and the outer side of the plugging head 6103 is fixedly connected to the branch plate 618. The two ends of the battery assembly 4 are the positions of the positive and negative electrodes. However, the positive and negative electrodes of the lithium battery are the places where the electrochemical reaction is most active. Therefore, these two parts are prone to bulging due to temperature rise. If the positive electrode of the lithium battery bulges, the bulging part will squeeze the movable plate 612 outward, and the squeezed movable plate 612 will move outward with the short rod 614 and the external rod 617 connected to the outside thereof, respectively. The other end of the short rod 614 is connected to the spring 616 through the connecting piece 615, and the spring 616 plays a role in resetting the movable plate 612. Therefore, as the movable plate 612 moves outward, the spring 616 will stretch and lengthen. At the same time, the branch plate 618 arranged on the other end of the external rod 617 will be squeezed and move outward, wherein the branch plate 618 is respectively connected to the anti- The leak-proof shrapnel 6104 and the plugging head 6103 are connected, so the leak-proof shrapnel 6104 connected to both ends of the branch plate 618 will be stretched and compressed respectively, and at the same time, the plugging head 6103 will extend outward from the perforated disk 6101 with the engaging block 6102, so that the inner cavity of the cylinder 610 is no longer closed, wherein the leak-proof shrapnel 6104 is elastic and plays a role in preventing the coolant from overflowing. At this time, the small pump body 65 connected to the cylinder 610, the coolant inside it will enter the inner frame 611 through the perforated disk 6101 and the cylinder 610 respectively, and the inner frame 611 is arranged on both ends of the battery assembly 4, so the coolant inside it will play a role in cooling the bulging part of the positive electrode of the battery assembly 4, and at the same time play a role in avoiding the occurrence of greater dangers.

[0045] like Figure 13 、 Figure 14 and Figure 15As shown, the reflux assembly 64 includes a support frame 641, which is fixedly connected to the top of the bottom sheath 58. The center part of the inner side of the support frame 641 is rotatably connected to the flip bend plate 642. The outer end surface of the flip bend plate 642 is fixedly connected to a rotary joint 643. The end of the rotary joint 643 away from the flip bend plate 642 is fixedly connected to a U-shaped rod 644. The end of the U-shaped rod 644 away from the rotary joint 643 is fixedly connected to a tough piece 645, wherein the tough piece 645 squeezes with the branch plate 618. Press-fit, the end of the flip-up plate 642 away from the rotary joint 643 is fixedly connected to the inclined push plate 646, and the side of the inclined push plate 646 close to the bottom sleeve 58 is squeeze-fitted with an insertion plate 647, which is inserted into the surface of the inner frame 611 and extends into the interior thereof, and the outer side of the insertion plate 647 is fixedly connected to a plate sleeve 648, and the side of the plate sleeve 648 away from the inner frame 611 is fixedly connected to a return spring 649, and the end of the return spring 649 away from the plate sleeve 648 is fixedly connected to the bottom sleeve 58. As the branch plate 618 moves outward, it squeezes the tough piece 645. At this time, the U-shaped rod 644 fixedly connected to the two ends of the tough piece 645 will be forced to move outward, wherein the other end of the U-shaped rod 644 is connected to the flip bend plate 642 through the rotary joint 643. Therefore, the flip bend plate 642 will deflect counterclockwise through the support frame 641, and the inclined push plate 646 fixedly connected to the inner end of the bottom of the flip bend plate 642 will also deflect counterclockwise and hit the interleaved plate 647. The interleaved plate 647 that is hit will carry the plate The sleeve 648 moves toward the inner frame 611 and stretches the reset spring 649, wherein the reset spring 649 resets the insertion plate 647. Then the insertion plate 647 is inserted into the interior of the inner frame 611 and squeezes the flow blocking plate 6402, causing the flow blocking plate 6402 to deflect upward through the plate connector 6401 until the flow blocking plate 6402 and the leak-proof plug 6403 block the bottom of the inner cavity of the inner frame 611, so that the coolant flowing out of the cylinder 610 will remain in the inner frame 611, thereby achieving the cooling and eliminating effect on the battery bulge.

[0046] The bottom of the inner frame 611 is fixedly connected to a return pipe 640, and the end of the return pipe 640 away from the inner frame 611 is fixedly connected to the small pump body 65. The return pipe 640 is sleeved on the surface of the bottom sleeve 58. The interior of the inner frame 611 is fixedly connected to a plate connector 6401, and the interior of the plate connector 6401 is rotatably connected to a flow blocking plate 6402. Both ends of the flow blocking plate 6402 and the end away from the plate connector 6401 are fixedly connected to an anti-leakage plug 6403, and the outer side of the anti-leakage plug 6403 is squeezed and adapted to the inner wall of the inner frame 611. In addition, when the bulge is eliminated, the entire explosion-proof assembly 61 will return to its original state under the action of spring 616. At the same time, the return spring 649 inside the return assembly 64 will also return the return assembly 64 to its original state. At this time, the flow blocking plate 6402 will deflect downward again, and the coolant inside the internal frame 611 will re-enter the small pump body 65 through the return pipe 640 for heat exchange and cooling, and also cool down the subsequent bulge. In addition, the main purpose of the above reset is to prevent the coolant from continuously cooling a certain pole and affecting the performance of the battery.

[0047] When the present invention is in use: First, when the temperature of the surface of the battery assembly 4 is too high and higher than a predetermined value, or when spontaneous combustion occurs, the NiTi binary alloy plate 51 arranged at the bottom of the battery assembly 4 will bend due to heat, wherein the NiTi binary alloy plate belongs to the category of shape memory alloy, and the Ni atomic percentage is about 50.8%-51.0%, so as to control the bending temperature of the alloy to about 70°C, which is the predetermined maximum temperature inside the battery pack, and the bent end of the NiTi binary alloy plate 51 is released from the straight plate 52, so the NiTi binary alloy plate 51 will bend downward and squeeze the straight plate 52, wherein the bottom of the straight plate 52 is connected to the trapezoidal bar 53, so the trapezoidal bar 53 will move downward and squeeze the inclined plate 54, and the squeezed inclined plate 54 will carry the other end with it. The multi-fold plates 55 connected at the ends move outward, wherein the inclined plate 54, trapezoidal bar 53, straight plate 52 and NiTi binary alloy plate 51 initially support and limit the top of the battery assembly 4, but as the multi-fold plate 55 moves outward, its top will be pulled out from the inside on both sides of the battery assembly 4. At this time, the battery assembly 4 will not be restricted and move downward, and finally the battery assembly 4 will enter the central cavity of the hollow shell 56. At this time, the coolant in the cavity on both sides of the hollow shell 56 will cool the surface of the battery assembly 4. At the same time, as the inclined plate 54 and the multi-fold plate 55 move outward, the inclined plate 54 will be retracted into the cavity on both sides of the hollow shell 56, and then the carbon dioxide compressed liquid inside the capsule 57 will be ejected from the junction of the cavities on both sides of the inclined plate 54 and the hollow shell 56, and enter the central cavity of the hollow shell 56.

[0048] The two ends of the battery assembly 4 are the locations of the positive and negative electrodes. However, the positive and negative electrodes of the lithium battery are the places where the electrochemical reaction is most active. Therefore, these two parts are prone to bulging due to temperature rise. If the positive electrode of the lithium battery bulges, the bulging part will squeeze the movable plate 612 outward, and the squeezed movable plate 612 will move outward with the short rod 614 and the external rod 617 connected to the outside thereof, respectively. The other end of the short rod 614 is connected to the spring 616 through the connecting piece 615. Therefore, as the movable plate 612 moves outward, the spring 616 will stretch and lengthen. At the same time, the branch plate 618 set on the other end of the external rod 617 will be squeezed. It is squeezed and moves outward, wherein the branch plate 618 is respectively connected to the leak-proof spring piece 6104 and the sealing head 6103, so the leak-proof spring piece 6104 connected to the two ends of the branch plate 618 will be stretched and compressed, and at the same time the sealing head 6103 will extend outward from the perforated disk 6101 with the engaging block 6102 and move away. At this time, the small pump body 65 connected to the cylinder 610, the coolant inside it will pass through the perforated disk 6101 and the cylinder 610 into the inner frame 611 respectively. At this time, the coolant inside the inner frame 611 arranged at both ends of the battery assembly 4 will cool down the positive electrode bulge part of the battery assembly 4.

[0049] As the branch plate 618 moves outward, it squeezes the tough piece 645. At this time, the U-shaped rod 644 fixedly connected to the two ends of the tough piece 645 will be forced to move outward, wherein the other end of the U-shaped rod 644 is connected to the flip bend plate 642 through the rotary joint 643. Therefore, the flip bend plate 642 will be deflected counterclockwise through the support frame 641, and the inclined push plate 646 fixedly connected to the inner end of the bottom of the flip bend plate 642 will also be deflected counterclockwise. The hour hand deflects and hits the insertion plate 647, and the impacted insertion plate 647 will move toward the inner frame 611 with the plate sleeve 648 and stretch the return spring 649. Then the insertion plate 647 will be inserted into the interior of the inner frame 611 and squeeze the flow blocking plate 6402, causing the flow blocking plate 6402 to deflect upward through the plate seat 6401 until the flow blocking plate 6402 and the anti-leakage plug 6403 block the bottom of the inner cavity of the inner frame 611.

[0050] The above embodiments are only preferred embodiments of the present invention and cannot limit the scope of protection of the present invention. Various changes made by ordinary technicians in this field based on the above concepts without creative work fall within the scope of protection of the present invention.

Claims

1. A safe explosion-proof lithium-ion battery, characterized in that: include: A protection mechanism is used to extinguish and cool down lithium batteries that are on fire or have excessive temperatures; An explosion-proof mechanism, which is used to eliminate bulges on the surface of lithium batteries; An inner shell is provided on the outside of the explosion-proof mechanism, a battery assembly is provided at the center of the inner shell, and the explosion-proof mechanisms are symmetrically arranged at both ends of the battery assembly. The bottom of the inner shell is fixedly connected to the protection mechanism, and the outer shell is fixedly connected to the outside of the protection mechanism. A top cover is provided on the top of the outer shell; A top protective sleeve is provided on the top of the inner cavity of the inner shell, and side guard plates are symmetrically provided on both sides of the inner cavity of the inner shell; The protection mechanism includes a bottom sleeve, which is arranged at the bottom of the side guard plate, and a bottom connecting plate is fixedly connected to the outer side of the bottom sleeve, and the bottom connecting plate is slidably adapted to the side guard plate, and the bottom connecting plate is fixedly connected to the inner shell; The bottom of the battery assembly is fixedly connected to a NiTi binary alloy plate, the bottom of the NiTi binary alloy plate is extruded and adapted to be equipped with a straight plate, the bottom of the straight plate is fixedly connected to a trapezoidal bar, the outer side of the trapezoidal bar is slidably adapted to the bottom sheath, the bottom of the trapezoidal bar is extruded and adapted to be equipped with an inclined plate, the end of the inclined plate away from the trapezoidal bar is fixedly connected to a multi-fold plate, wherein the number of the multi-fold plates is two; The bottom of the bottom shield and the bottom connecting plate are both fixedly connected to a hollow shell, wherein the interior of the hollow shell is divided into three chambers, the central chamber is hollow and empty, and the interiors of the two side chambers are fixedly connected to a capsule body, and a coolant is placed in the space below the capsule body and in the space enclosed by the side chambers of the hollow shell. The side chambers of the hollow shell and the surface of the capsule body are both connected to the multi-fold plate, and the end of the multi-fold plate away from the capsule body is inserted into the outside of the battery assembly; The explosion-proof mechanism includes an explosion-proof component, which is arranged on both ends of the battery component. An intermediate sleeve is provided at the end of the explosion-proof component away from the battery component. Penetration rods are inserted at both ends of the intermediate sleeve. The end of the penetration rod away from the intermediate sleeve is fixedly connected to the side guard plate. A reflux component is provided on the side of the explosion-proof component, and the reflux component is arranged on the top of the bottom sleeve. A small pump body is fixedly connected to the outside of the explosion-proof component and the reflux component, and the small pump body is fixedly connected to the top of the bottom connecting plate.

2. A safe explosion-proof lithium-ion battery according to claim 1, characterized in that: The explosion-proof assembly includes an inner frame, which is fixedly connected to the top of the bottom sleeve. A movable plate is slidably adapted on one side of the inner frame close to the battery assembly, and a limiting plate is fixedly connected inside the inner frame.

3. A safe explosion-proof lithium-ion battery according to claim 2, characterized in that: The side of the movable plate away from the battery assembly is fixedly connected to a short rod and an external rod, and the end of the short rod away from the movable plate is fixedly connected to a connecting piece. A spring is provided on the side of the short rod, one end of the spring is fixedly connected to the connecting piece, and the end of the spring away from the connecting piece is fixedly connected to the inner side of the inner frame.

4. A safe explosion-proof lithium-ion battery according to claim 3, characterized in that: The end of the external connecting rod away from the movable plate is squeezed and adapted to be equipped with a branch plate, and both sides of the branch plate are fixedly connected with leak-proof spring sheets, and the end of the leak-proof spring sheet away from the branch plate is fixedly connected with a cylinder, and the outer side of the cylinder is fixedly connected with a cylinder sleeve, and both ends of the cylinder sleeve are fixedly connected to the side guard plates.

5. The safe explosion-proof lithium-ion battery according to claim 4, characterized in that: The end of the cylinder away from the sleeve is fixedly connected to the small pump body, the inside of the cylinder is fixedly connected to the perforated disk, the inner side of the perforated disk is plugged with a mosaic block, the side of the mosaic block away from the perforated disk is fixedly connected to a plugging head, and the outer side of the plugging head is fixedly connected to the branch plate.

6. The safe and explosion-proof lithium-ion battery according to claim 5, characterized in that: The reflux assembly includes a support frame, which is fixedly connected to the top of the bottom sleeve. The central part of the inner side of the support frame is rotatably connected to a flip flanking plate. The outer end surface of the flip flanking plate is fixedly connected to a rotary joint. The end of the rotary joint away from the flip flanking plate is fixedly connected to a U-shaped rod. The end of the U-shaped rod away from the rotary joint is fixedly connected to a tough piece, wherein the tough piece is extruded and adapted to the branch plate.

7. A safe explosion-proof lithium-ion battery according to claim 6, characterized in that: The end of the flipping plate away from the rotating joint is fixedly connected to an inclined push plate, and the inclined push plate is squeezed and adapted to be fitted with an insertion plate on the side close to the bottom sleeve. The insertion plate is inserted into the surface of the inner frame and extends into the interior thereof, and the outer side of the insertion plate is fixedly connected to a plate sleeve, and the side of the plate sleeve away from the inner frame is fixedly connected to a return spring, and the end of the return spring away from the plate sleeve is fixedly connected to the bottom sleeve.

8. The safe and explosion-proof lithium-ion battery according to claim 7, characterized in that: The bottom of the inner frame is fixedly connected with a return pipe, one end of the return pipe away from the inner frame is fixedly connected to the small pump body, and the return pipe is sleeved on the surface of the bottom sleeve.

9. The safe explosion-proof lithium-ion battery according to claim 8, characterized in that: The interior of the inner frame is fixedly connected to a plate seat, the interior of the plate seat is rotatably connected to a flow blocking plate, both ends of the flow blocking plate and the end away from the plate seat are fixedly connected to anti-leakage plugs, and the outer side of the anti-leakage plug is squeezed and adapted to the inner wall of the inner frame.

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