High-safety new energy automobile lithium battery pack

Abstract

The invention belongs to the technical field of lithium batteries, and particularly relates to a high-safety new energy automobile lithium battery pack which comprises a lithium battery pack protection shell, a phase change adjusting device, a heat dissipation ventilation mechanism and a lifting extrusion mechanism. A plurality of uniformly distributed lithium battery main bodies are arranged in the lithium battery pack protection shell; the phase change adjusting device comprises a plurality of separation frames, an extrusion push plate is arranged on one side of each separation frame, a clamping frame is fixed to each extrusion push plate, the space between each separation frame and the corresponding extrusion push plate is filled with a solid-liquid phase change material, and a heat exchange plate is installed on each separation frame; the lifting extrusion mechanism comprises a lifting push ring, a plurality of extrusion push blocks are arranged above the lifting push ring, and a supporting transverse plate is fixed to the extrusion push blocks. By arranging corresponding mechanisms of the lithium battery pack mounting device, the lithium battery pack can obtain a sufficient heat preservation effect, so that the stored electric quantity of the lithium battery pack is not reduced, the endurance of a new energy automobile is not reduced, and heat dissipation of the lithium battery pack in the normal use process is not influenced.

Description

Technical Field

[0001] The present invention belongs to the technical field of lithium batteries, and particularly relates to a high-safety lithium battery pack for new energy vehicles. Background Art

[0002] A lithium battery is a type of battery with lithium metal or lithium alloy as the positive / negative electrode material and using a non-aqueous electrolyte solution. Due to its environmental protection and energy-saving characteristics, lithium-ion batteries have become the most widely used power source at present. A lithium-ion battery pack composed of multiple single cells connected in series, parallel, or series-parallel has been increasingly widely used as a power supply in various fields due to its large capacity and high-rate discharge characteristics.

[0003] Among them, in the field of new energy vehicles, lithium batteries are also widely used. Since multiple lithium batteries need to quickly dissipate heat during operation, the lithium battery pack is often set to be exposed to the air. However, in cold weather, the lithium battery pack exposed to the air will reduce the stored electricity due to the low weather temperature, thereby reducing the cruising range of new energy vehicles.

[0004] The information disclosed in this background art section is only intended to enhance the overall understanding of the present invention and should not be regarded as an admission or any form of suggestion that this information constitutes prior art already known to those of ordinary skill in the art. Summary of the Invention

[0005] The purpose of the present invention is to provide a high-safety lithium battery pack for new energy vehicles, which can solve the problem in the above-mentioned prior art that the good heat preservation and heat dissipation effects of the lithium battery pack cannot be guaranteed.

[0006] In order to achieve the above purpose, the technical solution provided by a specific embodiment of the present invention is as follows:

[0007] A high-safety lithium battery pack for new energy vehicles, comprising: a lithium battery pack protective shell, a phase change adjustment device, a heat dissipation ventilation mechanism, and a lifting extrusion mechanism;

[0008] A plurality of uniformly distributed lithium battery bodies are arranged inside the lithium battery pack protective shell, and a ventilation cavity is drilled on the lithium battery pack protective shell;

[0009] The phase change adjustment device is arranged on the lithium battery pack protective shell. The phase change adjustment device includes a plurality of partition frames. One side of the partition frame is provided with an extrusion push plate. A clamping frame is fixed on the extrusion push plate. A solid-liquid phase change material is filled between the partition frame and the extrusion push plate. A heat exchange plate is installed on the partition frame;

[0010] The heat dissipation and ventilation mechanism is arranged in the ventilation cavity. The heat dissipation and ventilation mechanism is used to introduce gas into the lithium battery pack protective case, accelerate the heat dissipation effect of the lithium battery body, and prevent the lithium battery body from being damaged due to overheating.

[0011] The lifting and squeezing mechanism is arranged on the outer side of the lithium battery pack protective case. The lifting and squeezing mechanism includes a lifting push ring. A plurality of squeezing push blocks are arranged above the lifting push ring. The plurality of squeezing push blocks are respectively fixed on a plurality of squeezing push plates. A supporting cross plate is fixed on the squeezing push block.

[0012] In one or more embodiments of the present invention, a plurality of uniformly distributed ventilation holes are drilled on the side wall of the ventilation cavity, so that the gas in the ventilation cavity can be discharged into the lithium battery pack protective case, thereby accelerating the gas flow in the lithium battery pack protective case, and further achieving the purpose of improving the heat dissipation effect and preventing the temperature of the lithium battery body from being too high.

[0013] In one or more embodiments of the present invention, a fixed frame is installed on the outer side of the lithium battery pack protective case, providing a sliding space for the contact and separation between the partition plate and the trigger fixing ring. A heat conducting plate is arranged on the fixed frame, which is used to quickly transfer heat to the supporting block and the shape memory alloy push rod. A supporting block is arranged in the fixed frame, which is used to support the shape memory alloy push rod and transfer heat.

[0014] One side of the supporting block is connected with a plurality of shape memory alloy push rods. After the temperature of the shape memory alloy push rod rises, it will quickly elongate, so as to be able to push the partition plate to move into contact with the trigger fixing ring. And when the temperature of the shape memory alloy push rod drops and returns to its original state, it can retract to its original size, and then it is convenient for the top push spring to push the partition plate to reset, so that the partition plate is separated from the trigger fixing ring.

[0015] In one or more embodiments of the present invention, a partition plate is arranged on the side of the shape memory alloy push rod away from the supporting block. The partition plate is slidably connected with the fixed frame. A trigger fixing ring is arranged on one side of the partition plate. The trigger fixing ring is fixed on the fixed frame. By the contact between the partition plate and the trigger fixing ring, the start of a plurality of motors can be enabled, thereby increasing the gas flow speed in the lithium battery pack protective case and accelerating the heat dissipation in the lithium battery pack protective case. And by the separation between the partition plate and the trigger fixing ring, the plurality of motors can stop working.

[0016] A top push spring is connected between the partition plate and the fixed frame, which is used to push the partition plate to reset, so that the partition plate can be separated from the trigger fixing ring, and then the plurality of motors can stop working, reducing the waste of energy and achieving the effect of improving the endurance of new energy vehicles.

[0017] In one or more embodiments of the present invention, a plurality of first heat dissipation holes are formed in the extrusion push plate. A plurality of first plugging columns are fixedly connected to one side of the extrusion push plate close to the partition frame. A plurality of second heat dissipation holes are formed in the partition frame. A plurality of second plugging columns are fixedly connected to one side of the partition frame close to the extrusion push plate. After the partition frame and the extrusion push plate approach each other, the first plugging columns can be inserted into the second heat dissipation holes, and the second plugging columns can be inserted into the first heat dissipation holes, so that the solid-liquid phase change material will not leak, and it will not affect the filling of the solid-liquid phase change material in the gap between the partition frame and the extrusion push plate. Moreover, after the extrusion push plate moves away from the partition frame, the first plugging columns are no longer inserted into the second heat dissipation holes, and the second plugging columns are no longer inserted into the first heat dissipation holes, which is convenient for the gas in the lithium battery pack protective case to be discharged and facilitates heat dissipation.

[0018] In one or more embodiments of the present invention, a plurality of uniformly distributed pressure sensors are installed at the bottom of the partition frame for detecting the solid-liquid phase change material. When the extrusion push plate completely moves away from the partition frame, the liquid solid-liquid phase change material will cover the plurality of pressure sensors, and then the plurality of pressure sensors can detect the weight of the solid-liquid phase change material, so that the plurality of motors can be started to prevent the solid-liquid phase change material from being blown out by the gas.

[0019] In one or more embodiments of the present invention, the heat dissipation and ventilation mechanism includes a plurality of motors. A transmission support rod is connected to the motor. The other end of the transmission support rod is provided with a fan. The motor drives the rotation of the transmission support rod and the fan, so that the rotated fan can draw the external gas into the ventilation cavity and then spray it into the lithium battery pack protective case through the ventilation holes, so as to accelerate the gas flow in the lithium battery pack protective case and improve the heat dissipation effect.

[0020] In one or more embodiments of the present invention, a fixing column is connected between the motor and the lithium battery pack protective case for fixing the motor to prevent the motor from shaking and falling off, and improving the stability of the motor. A filter screen is arranged on one side of the motor for blocking impurities to prevent the impurities from entering the lithium battery pack protective case, so that the lithium battery main body will not be damaged. The filter screen is fixed on the lithium battery pack protective case to prevent the filter screen from falling off.

[0021] In one or more embodiments of the present invention, a plurality of lifting sliding grooves are formed in the lithium battery pack protective case to provide space for the lifting and sliding of the top pushing cushion plate, so as to reduce the space occupation. Fixed blocks are fixed in the lifting sliding grooves for fixing a pair of return springs to prevent the return springs from falling off and affecting each other;

[0022] A reset spring is connected between the fixed block and a pair of supporting cross plates. The reset spring can push the supporting cross plates to move, so as to pull the extrusion push block to reset the extrusion push plate, which is convenient for the liquid solid-liquid phase change material to slide down and for gas to be discharged.

[0023] In one or more embodiments of the present invention, a plurality of pushing pads are fixed on the lifting push ring, and the lifting and lowering movement of the lifting push ring is driven by controlling the lifting and lowering movement of the pushing pads.

[0024] A pushing electric push rod is arranged below the pushing pad. The pushing electric push rod is fixed on the lithium battery pack protection case. A piston column is connected between the pushing pad and the pushing electric push rod. The telescopic movement of the pushing electric push rod can be controlled through the piston column, and further the lifting and lowering movement of the lifting push ring can be controlled.

[0025] Compared with the prior art, through the setting of the corresponding mechanisms of the lithium battery pack installation device in the present invention, the lithium battery pack can obtain a sufficient heat preservation effect, so that the stored power of the lithium battery pack will not be reduced, and further the endurance of the new energy vehicle will not be reduced, and the heat dissipation during the normal use of the lithium battery pack will not be affected, and further the probability of damage to the lithium battery pack will be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments recorded in the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0027] Figure 1 Is a bottom view of a high-safety new energy vehicle lithium battery pack in an embodiment of the present invention;

[0028] Figure 2 Is Figure 1 The structural schematic diagram of part A in;

[0029] Figure 3 Is a sectional view of a high-safety new energy vehicle lithium battery pack in an embodiment of the present invention;

[0030] Figure 4 Is Figure 3 The structural schematic diagram of part B in;

[0031] Figure 5 Is Figure 3 The structural schematic diagram of part C in;

[0032] Figure 6 Is Figure 3 The structural schematic diagram of part D in;

[0033] Figure 7 Partial structural schematic diagram of the phase change regulating device in an embodiment of the present invention;

[0034] Figure 8 Stereogram of a high - safety new - energy vehicle lithium - battery pack in an embodiment of the present invention;

[0035] Figure 9 Partial structural schematic diagram of the lifting and extrusion mechanism in an embodiment of the present invention;

[0036] Figure 10 is Figure 9 Schematic diagram of the structure at position E in

[0037] Figure 11 Schematic diagram of the structure of the temperature - control component in an embodiment of the present invention.

[0038] Main reference numeral description:

[0039] 1 - Lithium - battery pack protective case, 101 - Lithium - battery main body, 102 - Fixed frame, 103 - Heat - conducting plate, 104 - Support block, 105 - Shape - memory alloy push rod, 106 - Partition plate, 107 - Trigger fixing ring, 108 - Thrust spring, 109 - Ventilation hole, 2 - Phase - change regulating device, 201 - Partition frame, 202 - Extrusion push plate, 203 - Clamping frame, 204 - Solid - liquid phase - change material, 205 - Heat - exchange plate, 206 - First heat - dissipation hole, 207 - First plugging column, 208 - Second heat - dissipation hole, 209 - Second plugging column, 210 - Pressure sensor, 3 - Heat - dissipation and ventilation mechanism, 301 - Motor, 302 - Transmission support rod, 303 - Fan, 304 - Fixed column, 305 - Filter net, 4 - Lifting and extrusion mechanism, 401 - Lifting push ring, 402 - Extrusion push block, 403 - Support cross - plate, 404 - Return spring, 405 - Fixed block, 406 - Thrust backing plate, 407 - Thrust electric push rod, 408 - Piston column. Detailed implementation manners

[0040] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0041] As Figures 1 to 11 shown, a high - safety new - energy vehicle lithium - battery pack in an embodiment of the present invention includes a lithium - battery pack protective case 1, a phase - change regulating device 2, a heat - dissipation and ventilation mechanism 3, and a lifting and extrusion mechanism 4.

[0042] As Figures 1 to 3 shown, within the lithium battery pack protective case 1, there are multiple uniformly distributed lithium battery bodies 101. An air vent cavity is drilled on the lithium battery pack protective case 1 to provide space for gas transportation, facilitating the entry of external air into the lithium battery pack protective case 1. Multiple uniformly distributed vent holes 109 are drilled on the side wall of the air vent cavity for discharging the gas in the air vent cavity into the lithium battery pack protective case 1, thereby accelerating the gas circulation within the lithium battery pack protective case 1, and further achieving the purpose of improving the heat dissipation effect and preventing the temperature of the lithium battery body 101 from being too high.

[0043] As Figure 1 and Figure 11 shown, a fixing frame 102 is installed on the outside of the lithium battery pack protective case 1 to provide a sliding space for the contact and separation between the partition plate 106 and the trigger fixing ring 107. A heat conducting plate 103 is provided on the fixing frame 102 for quickly transferring heat to the support block 104 and the shape memory alloy push rod 105. A support block 104 is arranged within the fixing frame 102 for supporting the shape memory alloy push rod 105 and transferring heat.

[0044] Specifically, multiple shape memory alloy push rods 105 are connected to one side of the support block 104. After the temperature of the shape memory alloy push rod 105 rises, it will rapidly elongate, thereby being able to push the partition plate 106 to move into contact with the trigger fixing ring 107. And when the temperature of the shape memory alloy push rod 105 drops and returns to its original state, it can retract to its original size, facilitating the top push spring 108 to push the partition plate 106 to reset, so that the partition plate 106 separates from the trigger fixing ring 107.

[0045] As Figure 11 shown, a partition plate 106 is arranged on the side of the shape memory alloy push rod 105 away from the support block 104. The partition plate 106 is slidably connected to the fixing frame 102. A trigger fixing ring 107 is arranged on one side of the partition plate 106, and the trigger fixing ring 107 is fixed to the fixing frame 102. The contact between the partition plate 106 and the trigger fixing ring 107 can start multiple motors 301, thereby increasing the gas flow rate within the lithium battery pack protective case 1 and accelerating the heat dissipation within the lithium battery pack protective case 1. And when the partition plate 106 separates from the trigger fixing ring 107, the multiple motors 301 can stop working.

[0046] Among them, a top push spring 108 is connected between the partition plate 106 and the fixing frame 102 for pushing the partition plate 106 to reset, so that the partition plate 106 can separate from the trigger fixing ring 107, and further the multiple motors 301 stop working, reducing energy waste and achieving the effect of improving the endurance of new energy vehicles.

[0047] AsFigures 1 to 7 As shown in the figure, the phase change regulating device 2 is arranged on the protective case 1 of the lithium battery pack. The phase change regulating device 2 includes a plurality of partition frames 201. One side of the partition frame 201 is provided with an extrusion push plate 202. The solid-liquid phase change material can be clamped by the partition frame 201 and the extrusion push plate 202 to prevent it from leaking. And when the extrusion push plate 202 approaches the partition frame 201, it will extrude the solid-liquid phase change material, so that the solid-liquid phase change material can fill the gap between the partition frame 201 and the extrusion push plate 202. Then, after the solid-liquid phase change material becomes solid, it can play a role in heat insulation and prevent the temperature of the lithium battery main body 101 from being too low.

[0048] Among them, a clamping frame 203 is fixed on the extrusion push plate 202 to prevent the extrusion push plate 202 from falling off. The solid-liquid phase change material 204 is filled between the partition frame 201 and the extrusion push plate 202. A heat exchange plate 205 is installed on the partition frame 201 to facilitate the rapid transfer of heat.

[0049] Preferably, the solid-liquid phase change material is n-tetradecane, and the phase change temperature of n-tetradecane is 5.5 °C. When the temperature of n-tetradecane is lower than 5.5 °C, it will change from liquid to solid, and the transformed solid n-tetradecane has good heat insulation effect, which can protect the lithium battery main body 101 and prevent the temperature of the lithium battery main body 101 from being too low and causing the reduction of the endurance of the new energy vehicle.

[0050] In addition, a plurality of first heat dissipation holes 206 are drilled on the extrusion push plate 202. A plurality of first plugging columns 207 are fixedly connected to the side of the extrusion push plate 202 close to the partition frame 201. A plurality of second heat dissipation holes 208 are drilled on the partition frame 201. A plurality of second plugging columns 209 are fixedly connected to the side of the partition frame 201 close to the extrusion push plate 202. After the partition frame 201 and the extrusion push plate 202 approach each other, the first plugging column 207 can be inserted into the second heat dissipation hole 208, and the second plugging column 209 can be inserted into the first heat dissipation hole 206, so that the solid-liquid phase change material will not leak, and it will not affect the solid-liquid phase change material filling the gap between the partition frame 201 and the extrusion push plate 202. Moreover, after the extrusion push plate 202 moves away from the partition frame 201, the first plugging column 207 no longer inserts into the second heat dissipation hole 208, and the second plugging column 209 no longer inserts into the first heat dissipation hole 206, which is convenient for the gas in the protective case 1 of the lithium battery pack to be discharged and facilitates heat dissipation.

[0051] As Figure 7As shown, a plurality of uniformly distributed pressure sensors 210 are installed at the bottom of the partition frame 201 for detecting the solid-liquid phase change material. When the extrusion push plate 202 is completely away from the partition frame 201, the liquid solid-liquid phase change material will cover the plurality of pressure sensors 210. Only then can the plurality of pressure sensors 210 detect the weight of the solid-liquid phase change material, so that the plurality of motors 301 can be started, avoiding the solid-liquid phase change material being blown out by the gas.

[0052] Specifically, the plurality of pressure sensors 210, the motors 301, and the top push electric push rod 407 are all electrically connected to the vehicle system of the new energy vehicle, enabling the vehicle system to intelligently control the pressure sensors 210, the motors 301, and the top push electric push rod 407 and facilitating signal reception.

[0053] As Figures 1 to 6 shown, the heat dissipation and ventilation mechanism 3 is arranged in the ventilation cavity. The heat dissipation and ventilation mechanism 3 is used to introduce gas into the lithium battery pack protective case 1 to accelerate the heat dissipation effect of the lithium battery main body 101 and avoid overheating damage to the lithium battery main body 101. The heat dissipation and ventilation mechanism 3 includes a plurality of motors 301. A transmission support rod 302 is connected to the motor 301, and a fan 303 is installed at the other end of the transmission support rod 302. The rotation of the transmission support rod 302 and the fan 303 is driven by the motor 301, so that the rotated fan 303 can draw external gas into the ventilation cavity and then spray it into the lithium battery pack protective case 1 through the ventilation holes 109, in order to accelerate the gas flow in the lithium battery pack protective case 1 and improve the heat dissipation effect.

[0054] Among them, a fixed column 304 is connected between the motor 301 and the lithium battery pack protective case 1 for fixing the motor 301 and avoiding the situation of the motor 301 shaking and falling off, improving the stability of the motor 301. A filter screen 305 is arranged on one side of the motor 301 for blocking impurities and avoiding impurities entering the lithium battery pack protective case 1, so that the lithium battery main body 101 will not be damaged. The filter screen 305 is fixed on the lithium battery pack protective case 1 to prevent the filter screen 305 from falling off.

[0055] As Figures 1 to 10 shown, the lifting and extrusion mechanism 4 is arranged outside the lithium battery pack protective case 1. The lifting and extrusion mechanism 4 includes a lifting push ring 401 for pushing a plurality of extrusion push blocks 402, so that the extrusion push blocks 402 can push the extrusion push plate 202 to move, making the extrusion push plate 202 move closer to the partition frame 201, and then squeezing and pushing the solid-liquid phase change material so that the solid-liquid phase change material can fill the gap between the partition frame 201 and the extrusion push plate 202. A plurality of extrusion push blocks 402 are arranged above the lifting push ring 401, and the plurality of extrusion push blocks 402 are respectively fixed on the plurality of extrusion push plates 202.

[0056] Specifically, a support cross plate 403 is fixed on the extrusion push block 402. The support cross plate 403 can drive the extrusion push block 402 to move, thereby pulling the extrusion push plate 202 to reset, facilitating the exposure of the first heat dissipation holes 206 and the second heat dissipation holes 208, and facilitating the flow of gas.

[0057] In addition, a plurality of lifting sliding grooves are drilled on the lithium battery pack protective case 1 to provide space for the lifting and sliding of the top push backing plate 406, so as to reduce the space occupation. A fixing block 405 is fixed in the lifting sliding groove for fixing a pair of return springs 404 to prevent the return springs 404 from falling off and affecting each other.

[0058] As Figure 2 shown, a return spring 404 is connected between the fixing block 405 and a pair of support cross plates 403. The return spring 404 can push the support cross plate 403 to move, so that the extrusion push block 402 pulls the extrusion push plate 202 to reset, thereby facilitating the sliding down of the liquid-solid phase change material and facilitating the discharge of gas.

[0059] As Figures 9 to 10 shown, a plurality of top push backing plates 406 are fixed on the lifting push ring 401. The lifting and moving of the lifting push ring 401 is driven by controlling the lifting and moving of the top push backing plate 406. A top push electric push rod 407 is arranged below the top push backing plate 406. The top push electric push rod 407 is fixed on the lithium battery pack protective case 1. A piston column 408 is connected between the top push backing plate 406 and the top push electric push rod 407. The telescopic movement of the top push electric push rod 407 can be controlled through the piston column 408, and further the lifting and moving of the lifting push ring 401 can be controlled.

[0060] During specific use, after the new energy vehicle stops running, a plurality of top push electric push rods 407 are started. The extension of the piston column 408 is controlled by the top push electric push rod 407 to push the top push backing plate 406 and the lifting push ring 401 to rise. During the rising process of the lifting push ring 401, the extrusion push block 402 can be pushed. The extrusion push block 402 is used to push the extrusion push plate 202 to move closer to the partition frame 201. When the extrusion push plate 202 moves closer to the partition frame 201, the first plugging column 207 is inserted into the second heat dissipation hole 208, and the second plugging column 209 is inserted into the first heat dissipation hole 206. Moreover, the space of the phase change material of solid-liquid will be reduced, so that the phase change material of solid-liquid can rise to fill the gap between the partition frame 201 and the extrusion push plate 202.

[0061] Then, when the temperature of the solid-liquid phase change material drops to the phase change temperature, it will change from liquid to solid, thereby completely blocking the gap between the partition frame 201 and the extrusion push plate 202. Moreover, after the solid-liquid phase change material changes to solid, it can achieve a good heat insulation effect, reduce the heat dissipation in the lithium battery pack housing 1, so that the low temperature outside will not affect the lithium battery body 101, and thus will not affect the power stored in the lithium battery body 101.

[0062] After the new energy vehicle starts and runs, first, multiple push electric push rods 407 will control the piston column 408 to retract, thereby driving the lowering of the lifting push ring 401. Then, through the push of the return spring 404, the gap between the extrusion push plate 202 and the partition frame 201 increases, and the first sealing column 207 no longer inserts into the second heat dissipation hole 208, and the second sealing column 209 no longer inserts into the first heat dissipation hole 206, facilitating the flow of gas. The operation of multiple lithium battery bodies 101 will generate a large amount of heat. Then, through the transfer of the heat exchange plate 205, the temperature of the solid-liquid phase change material can rise, and thus the solid-liquid phase change material changes from solid to liquid. At this time, the liquid solid-liquid phase change material will flow downward to the bottom of the partition frame 201. At this time, the gas in the lithium battery pack housing 1 will communicate with the outside through the second heat dissipation hole 208 and the first heat dissipation hole 206, enabling the large amount of heat generated by the operation of the lithium battery body 101 to be dissipated.

[0063] And when normal heat dissipation cannot be satisfied, the temperature in the lithium battery pack housing 1 will still rise. At this time, the temperature of the gas ejected from the first heat dissipation hole 206 will be relatively high, and the heat conduction plate 103 can transfer the heat to the support block 104 and the shape memory alloy push rod 105. When the temperature of the shape memory alloy push rod 105 rises, it will quickly elongate, thereby being able to push the partition plate 106 to move. When the partition plate 106 contacts the trigger fixing ring 107, multiple motors 301 will be started. Through the motors 301, the transmission support rod 302 and the fan 303 can be driven to rotate. The fan 303 will suck the relatively cold air outside into the ventilation cavity and then spray it into the lithium battery pack housing 1 through the ventilation holes 109 to achieve rapid cooling of the lithium battery body 101. Moreover, after the temperature in the lithium battery pack housing 1 drops, the temperature of the shape memory alloy push rod 105 will also drop accordingly. After the temperature of the shape memory alloy push rod 105 drops, it will return to its original length and no longer push the partition plate 106, so that the top push spring 108 can push the partition plate 106 to reset, separating the partition plate 106 from the trigger fixing ring 107. At this time, multiple motors 301 will stop working, thus saving energy.

[0064] Specifically, when the new energy vehicle stops running, heat is preserved by filling the gap between the solid-liquid phase change material in the partition frame 201 and the extrusion push plate 202 and making the solid-liquid phase change material become solid, so that the temperature of the lithium battery main body 101 will not be too low, thereby ensuring the endurance of the new energy vehicle. During the operation of the new energy vehicle, by making the solid-liquid phase change material become liquid, the solid-liquid phase change material no longer blocks the heat dissipation, facilitating the rapid discharge of the heat in the lithium battery pack housing 1 and preventing the temperature of the lithium battery main body 101 from being too high.

[0065] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above-described exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be encompassed within the present invention. Any reference signs in the claims should not be construed as limiting the claims involved.

[0066] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A high-safety new energy vehicle lithium battery pack, characterized in that: include: A lithium battery pack protective shell, wherein a plurality of evenly distributed lithium battery bodies are arranged in the lithium battery pack protective shell, and a ventilation cavity is bored on the lithium battery pack protective shell; A phase change regulating device is arranged on the protective shell of the lithium battery pack, and the phase change regulating device comprises a plurality of partition frames, an extrusion push plate is arranged on one side of the partition frame, a card frame is fixed on the extrusion push plate, a solid-liquid phase change material is filled between the partition frame and the extrusion push plate, and a heat exchange plate is installed on the partition frame; A heat dissipation and ventilation mechanism is provided in the ventilation cavity, and is used to introduce gas into the protective shell of the lithium battery pack to accelerate the heat dissipation effect on the lithium battery body and prevent the lithium battery body from being overheated and damaged; The lifting and extruding mechanism is arranged on the outside of the lithium battery pack protective shell. The lifting and extruding mechanism includes a lifting push ring. A plurality of extruding push blocks are arranged above the lifting push ring. The plurality of extruding push blocks are respectively fixed on the plurality of extruding push plates. A supporting cross plate is fixed on the extruding push blocks.

2. A high-safety new energy vehicle lithium battery pack according to claim 1, characterized in that: A plurality of evenly distributed ventilation holes are drilled on the side wall of the ventilation cavity.

3. A high-safety new energy vehicle lithium battery pack according to claim 1, characterized in that: A fixing frame is installed on the outer side of the lithium battery pack protective shell, a heat conducting plate is arranged on the fixing frame, a supporting block is arranged inside the fixing frame, and a plurality of shape memory alloy push rods are connected to one side of the supporting block.

4. A high-safety new energy vehicle lithium battery pack according to claim 1, characterized in that: A partition plate is arranged on one side of the shape memory alloy push rod away from the support block, the partition plate is slidably connected to the fixed frame, a trigger fixed ring is arranged on one side of the partition plate, the trigger fixed ring is fixed on the fixed frame, and a push spring is connected between the partition plate and the fixed frame.

5. A high-safety new energy vehicle lithium battery pack according to claim 1, characterized in that: A plurality of first heat dissipation holes are drilled on the extrusion push plate, a plurality of first blocking columns are fixedly connected to a side of the extrusion push plate close to the partition frame, a plurality of second heat dissipation holes are drilled on the partition frame, and a plurality of second blocking columns are fixedly connected to a side of the partition frame close to the extrusion push plate.

6. A high-safety new energy vehicle lithium battery pack according to claim 1, characterized in that: A plurality of evenly distributed pressure sensors are installed at the bottom of the partition frame.

7. A high-safety new energy vehicle lithium battery pack according to claim 1, characterized in that: The heat dissipation and ventilation mechanism comprises a plurality of motors, the motors are connected with transmission support rods, and a fan is installed at the other end of the transmission support rods.

8. A high-safety new energy vehicle lithium battery pack according to claim 1, characterized in that: A fixing column is connected between the motor and the lithium battery pack protective shell. A filter is arranged on one side of the motor, and the filter is fixed on the lithium battery pack protective shell.

9. A high-safety new energy vehicle lithium battery pack according to claim 1, characterized in that: A plurality of lifting slots are formed on the lithium battery pack protective shell, a fixing block is fixed in the lifting slot, and a return spring is connected between the fixing block and a pair of supporting horizontal plates.

10. A high-safety new energy vehicle lithium battery pack according to claim 1, characterized in that: A plurality of push pads are fixed on the lifting push ring, a push electric push rod is arranged below the push pad, the push electric push rod is fixed on the lithium battery pack protective shell, and a piston column is connected between the push pad and the push electric push rod.

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