New energy automobile battery pack protection device

Abstract

The invention relates to the technical field of automobile batteries, in particular to a new energy automobile battery pack protection device.A high-temperature protection structure is arranged in a shell and comprises a hollow box, a supporting frame is arranged in the hollow box, and a memory metal block is fixed to the inner side of the supporting frame; a hollow box is arranged in the shell, a conducting rod is fixed in the shell, the end of the conducting rod extends into the hollow box and is connected with a metal supporting frame, the end of a circuit is located in the hollow box, and a first copper block is fixed to the end of the circuit. When the temperature of the memory metal block exceeds a preset temperature, the memory metal block is bent upwards and provides an upward acting force, then a vertical plate drives a second copper block and a cross rod to rise, and when the cross rod rises, a first spring is stretched, so that the memory metal block and the second copper block are separated from each other; after rising, the second copper block is separated from the first copper block to disconnect the circuit so as to realize overheating protection.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of automobile battery, and particularly relates to a new energy automobile battery pack protection device. BACKGROUND

[0002] The automobile battery pack is the power core of the electric vehicle, and is usually composed of thousands of independent small battery units (battery cells) in series and parallel combination, forming a high-voltage, large-capacity energy storage system. It not only provides the required electric energy for the driving motor, but also powers the vehicle-mounted electronic devices.

[0003] The invention patent CN104409795B proposes a battery module integrated with air cooling and liquid cooling, which can ensure the consistency of the temperature of each battery in the module under complex working conditions through liquid circulation design. The special-shaped cooling fins are combined to form a net structure, which ensures that the air has a large area to exchange heat with the cooling fins under the condition of forced air convection, and carries away more heat. The integrated design makes the cooling system independent, and each module forms a cooling system. In the application of the battery pack, because there is only a power line connection between the modules, there is no other connection, so the failure rate is greatly reduced. In addition, maintenance is very convenient, and the faulty module can be replaced directly without changing other devices in the battery pack.

[0004] The cooling process of the above-mentioned liquid cooling or air cooling system is relatively slow, and it is difficult to respond to the rapid temperature rise caused by short circuit or other sudden situations in time, which may cause thermal runaway in an instant, thereby greatly increasing the risk of battery combustion. When the temperature of the battery abnormally rises in a very short time, if the power supply cannot be cut off quickly, the safety hazard will be significantly increased. However, the current battery system lacks the function of directly cutting off the power at the critical moment, which limits its response ability in emergency situations and seriously affects the safety of new energy vehicles. SUMMARY

[0005] The present application relates to the technical field of automobile battery, and particularly relates to a new energy automobile battery pack protection device.

[0006] In order to achieve the above object, the present application adopts the following technical scheme: A new energy automobile battery pack protection device, comprising: a shell, a battery pack composed of battery cells, a line is arranged outside the shell, a high temperature protection structure is arranged inside the shell, the high temperature protection structure comprises a hollow box, a support frame is arranged inside the hollow box, a memory metal block is fixed to the inner side of the support frame, a conductive rod is fixed inside the shell, the end of the conductive rod extends into the inside of the hollow box and is connected with the support frame of the metal, the end of the line is located in the inside of the hollow box and is fixed with a first copper block, a first notch is arranged at the back of the hollow box, a first spring is fixed in the inside of the first notch, a cross bar is slidably connected in the inside of the notch, a vertical plate is fixed to one end of the cross bar, the bottom of the vertical plate is in contact with the top of the memory metal block, a vent is penetrated through the back of the hollow box, the vertical plate is provided with a hollow second copper block, and the vertical plate is divided into two sections by the second copper block, and the first copper block and the second copper block are in contact to form a passage of the line in the initial state.

[0007] As a further scheme of the present application, a delay assembly is arranged in the inside of the hollow box, the delay assembly comprises a support plate fixed at the top of the inner cavity of the hollow box, a vertically distributed hollow pure iron is slidably connected with the support plate, a elastic air cushion is fixed to one side of the support plate, and the elastic air cushion is located in the hollow of the pure iron.

[0008] As a further scheme of the present application, the delay assembly further comprises a timer in the second copper block, air slots are fixed to the two sides of the second copper block, and electromagnets are installed in the inside of the air slots.

[0009] As a further scheme of the present application, a hollow box is arranged at one side of the hollow box in the inside of the shell, a heat absorption and cooling assembly is arranged in the inside of the hollow box, the heat absorption and cooling assembly comprises a micro pump installed at one side of the hollow box, the inside of the hollow box is divided into a first chamber and a second chamber, solid paraffin is stored in the inside of the first chamber, and a water baffle and a liquid discharge pipe are arranged on the first chamber.

[0010] As a further scheme of the present application, the hollow box is provided with a ventilation hole, a second notch is arranged at the back of the hollow box at the same horizontal position as the first notch, one end of the cross bar penetrates through the first notch and the second notch to the inside of the first chamber, a sealing plate is fixed to one end of the cross bar, and the sealing plate blocks the ventilation hole in the low temperature state of the battery pack.

[0011] As a further scheme of the present application, the micro pump is connected with a water suction pipe and a water discharge pipe, the water suction pipe is located in the inside of the second chamber, the water discharge pipe is located in the inside of the first chamber, and condenser plates are installed in the inside of the four walls of the first chamber through the cavities arranged therein.

[0012] As a further scheme of the present application, the inside of the shell is provided with a protection assembly, the protection assembly comprises four groups of hollow metal plates fixedly connected with a hollow box, the top of the metal plate is provided with a plastic seal, the bottom of the inner cavity of the metal plate is slidably connected with a bottom plate, the top of the hollow box is provided with a cross bar, the top of the cross bar is fixedly connected with a vertical rod, the vertical rod penetrates the inside of the hollow box and is fixedly connected with the bottom of the cross bar.

[0013] As a further scheme of the present application, the protection assembly further comprises a bent rod fixedly connected with the cross bar, the bottom of the bent rod is located in the inside of the metal plate and is fixedly connected with the bottom plate, the two ends of the bottom plate are fixedly connected with the second spring, and the second spring is in a compressed state, the top of the second spring is fixedly connected with a top plate, and the bottom plate and the top plate are fixedly connected with a folded metal sheet.

[0014] The new energy automobile battery pack protection device has the beneficial effects that:

[0015] 1. When the temperature sensor detects that the temperature of the battery pack exceeds the safety threshold (that is, when the battery temperature abnormally rises and there is a risk of thermal runaway), the high temperature is transmitted to the support frame through the conduction rod and finally to the memory metal block, and at the same time, the high temperature enters the hollow box through the air vent, increasing the heating speed of the memory metal block, or an exhaust fan can be installed at the air vent to further increase the heating speed of the memory metal block. When the temperature of the memory metal block exceeds the predetermined temperature, the memory metal block bends upward and provides an upward force, and then the vertical plate rises with the second copper block and the cross bar. When the cross bar rises, the first spring is stretched, and after the second copper block rises, it is separated from the first copper block to disconnect the circuit and achieve overheat protection.

[0016] 2. When the second copper block rises to the two sides of the support plate, the electromagnet generates a strong magnetic force to attract pure iron, which enters the inside of the air slot under the action of the strong magnetic force and compresses the elastic air cushion, thereby connecting the second copper block with the support plate. Then the timer in the second copper block starts timing, and after a delay (such as 5 minutes), it is automatically unlocked. Through the delay effect, the circuit can be protected, and the battery can be protected from damage caused by frequent on-off in a short time.

[0017] 3、Through the heat absorption cooling assembly set, the horizontal rod elevates the sealing plate in the first chamber, makes the sealing plate from the position of the air hole and opens the air hole, then the high temperature of the battery pack enters through the air hole, then the paraffin in the first chamber is heated to become liquid, in this process, the paraffin absorbs a large amount of heat to realize cooling, then the liquid paraffin enters the second chamber through the liquid discharge pipe, after that, the micro pump starts, the liquid paraffin is pumped into the first chamber, before that, the condensation piece in the first chamber wall is electrified to cool the first chamber, then the liquid paraffin in the first chamber re-solidifies at low temperature, and the solid paraffin is convenient for reuse, and the cycle heat absorption cooling is realized.

[0018] 4、Through the protection assembly set, the plastic seal is hard when the heat dissipation state is reached, so the horizontal rod with the top plate moves and does not break the plastic seal, the plastic seal is broken only when the battery is on fire, after the plastic seal is broken, the compressed second spring resets with the top plate and the unfolded metal sheet, the metal plate and the unfolded metal sheet form an isolation barrier around the battery, the isolation can delay the spread of sparks and reduce the speed of spontaneous combustion to provide escape time for the driver and passengers, and temporary protection for the driver and passengers is realized. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 The battery pack top view is proposed in the application;

[0020] Figure 2 The battery pack top view is proposed in the application; Figure 1 The structure separation structure schematic diagram;

[0021] Figure 3 The battery pack top view is proposed in the application; Figure 2 The local structure schematic diagram;

[0022] Figure 4 The hollow box and hollow box structure schematic diagram is proposed in the application;

[0023] Figure 5 The hollow box local structure schematic diagram is proposed in the application;

[0024] Figure 6 The battery pack top view is proposed in the application; Figure 4 The local structure schematic diagram;

[0025] Figure 7 The No. 2 copper block local sectional view is proposed in the application;

[0026] Figure 8 The support plate sectional view is proposed in the application;

[0027] Figure 9 The internal structure diagram of the hollow box proposed by the present application;

[0028] Figure 10 The internal structure diagram of the metal plate proposed by the present application;

[0029] Figure 11 The internal structure diagram of the metal plate proposed by the present application; Figure 10 The internal structure diagram of the metal plate proposed by the present application;

[0030] In the figure: 1, the shell; 2, the battery; 3, the line; 4, the hollow box; 5, the support frame; 6, the memory metal block; 7, the conductive rod; 8, the first copper block; 9, the first notch; 10, the first spring; 11, the horizontal rod; 12, the vertical plate; 13, the second copper block; 14, the air vent; 15, the support plate; 16, pure iron; 17, the elastic air cushion; 18, the timer; 19, the hollow slot; 20, the electromagnet; 21, the hollow box; 22, the micro pump; 23, the first chamber; 24, the second chamber; 25, the drainage pipe; 26, the air hole; 27, the second notch; 28, the sealing plate; 29, the metal plate; 30, the plastic seal; 31, the bottom plate; 32, the horizontal bar; 33, the vertical rod; 34, the bent rod; 35, the second spring; 36, the top plate; 37, the metal sheet; 38, the water baffle. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0032] In the description of the application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the application. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance. In the description of the application, it should be noted that unless otherwise specifically defined and limited, the terms "mounting", "connecting", "connecting", "setting" should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances, and the embodiments thereof will be described below according to the overall structure of the application.

[0033] A new energy automobile battery pack protection device, comprising: a shell 1, a battery pack 2 composed of battery cells, the shell 1 is externally provided with a circuit 3, characterized in that: the inside of the shell 1 is provided with a high temperature protection structure, the high temperature protection structure comprises a hollow box 4, the inside of the hollow box 4 is provided with a support frame 5, the inside of the support frame 5 is fixedly provided with a memory metal block 6, the inside of the shell 1 is fixedly provided with a conducting rod 7, the end of the conducting rod 7 extends into the inside of the hollow box 4 and is connected with the metal support frame 5, the end of the circuit 3 is located in the inside of the hollow box 4 and is fixedly provided with a first copper block 8, the back of the hollow box 4 is provided with a first notch 9, the inside of the first notch 9 is fixedly provided with a first spring 10, the inside of the first notch 9 is slidingly connected with a cross rod 11, one end of the cross rod 11 is fixedly provided with a vertical plate 12, the bottom of the vertical plate 12 is in contact with the top of the memory metal block 6, the back of the hollow box 4 is penetrated by an air vent 14, the vertical plate 12 is provided with a hollow second copper block 13, and the vertical plate 12 is divided into two sections by the second copper block 13, the first copper block 8 is in contact with the second copper block 13 to form a passage of the circuit 3 in an initial state, when the temperature sensor detects that the temperature of the battery pack 2 exceeds a safety threshold, at this time, the high temperature is transmitted to the support frame 5 through the conducting rod 7 and finally to the memory metal block 6, and the high temperature enters the hollow box 4 through the air vent 14, thereby increasing the heating speed of the memory metal block 6, or an exhaust fan can be installed at the air vent 14 to further increase the heating speed of the memory metal block 6, when the temperature of the memory metal block 6 exceeds a predetermined temperature, at this time, the memory metal block 6 bends upward and provides an upward force, then the vertical plate 12, the second copper block 13 and the cross rod 11 are lifted, the cross rod 11 stretches the first spring 10 when it is lifted, and the second copper block 13 is separated from the first copper block 8 to disconnect the circuit 3 and realize overheat protection.

[0034] Further, the inside of the hollow box 4 is provided with a delay assembly, the extension assembly includes a support plate 15 fixed at the top of the inner cavity of the hollow box 4, the support plate 15 is slidably connected with a vertically distributed hollow pure iron 16, one side of the support plate 15 is fixed with an elastic air cushion 17, the elastic air cushion 17 is located in the hollow of the pure iron 16, the delay assembly further includes a timer 18 in the second copper block 13, the two sides of the second copper block 13 are fixed with a hollow groove 19, the inside of the hollow groove 19 is installed with an electromagnet 20, when the second copper block 13 is raised to the two sides of the support plate 15, the electromagnet 20 generates strong magnetic force under power to attract the pure iron 16, the pure iron 16 enters the inside of the hollow groove 19 under the action of the strong magnetic force and compresses the elastic air cushion 17, the connection between the second copper block 13 and the support plate 15 can be completed, then the timer 18 in the second copper block 13 starts timing, and is automatically unlocked after a delay (such as 5 minutes) (the electromagnet 20 is turned off, and then the pure iron 16 is retracted from the hollow groove 19 to complete the unlocking under the resetting action of the elastic air cushion 17), the circuit can be protected through the delay effect, and damage to the battery caused by multiple on-off in a short time is avoided, when the temperature of the battery decreases, the memory metal block 6 returns to the original state, then the first spring 10 resets the second copper block 13 to descend and re-contact the first copper block 8 to make the circuit 3 be re-connected.

[0035] Next, the inside of the shell 1 located at one side of the hollow box 4 is provided with a hollow box 21, the inside of the hollow box 21 is provided with a heat absorption and cooling assembly, the heat absorption and cooling assembly includes a micro pump 22 installed at one side of the hollow box 21, the inside of the hollow box 21 is divided into a first chamber 23 and a second chamber 24, the inside of the first chamber 23 stores solid paraffin, the first chamber 23 is provided with a water blocking strip 38 and a liquid discharge pipe 25, the hollow box 21 is provided with a ventilation hole 26, the back of the hollow box 21 is provided with a second slot 27 at the same horizontal position as the first slot 9, one end of the cross rod 11 penetrates the first slot 9 and the second slot 27 to come to the inside of the first chamber 23, one end of the cross rod 11 is fixed with a sealing plate 28, the sealing plate 28 blocks the ventilation hole 26 when the battery pack is in a low temperature state, preventing dust from entering to affect the heat absorption efficiency of the paraffin.

[0036] In addition, the micro pump 22 is connected with a water suction pipe and a water discharge pipe, the water suction pipe is located in the second chamber 24, and the water discharge pipe is located in the first chamber 23, the inside of the four walls of the first chamber 23 is installed with a condenser sheet through the cavity not shown in the figure.

[0037] It can be concluded that the horizontal bar 11 is raised with the sealing plate 28 in the first chamber 23, so that the sealing plate 28 is away from the position of the air hole 26 and the air hole 26 is opened, then the high temperature of the battery pack enters through the air hole 26, and then the paraffin in the first chamber 23 is heated to become liquid, in the process, the paraffin absorbs a large amount of heat to achieve cooling, then the liquid paraffin enters the second chamber 24 through the liquid outlet pipe 25, and then the micro pump 22 starts to pump the liquid paraffin into the first chamber 23, before that, the condensation piece in the wall of the first chamber 23 is electrified to cool the first chamber 23, then the liquid paraffin in the first chamber 23 is re-solidified at low temperature, and the heat released during solidification is discharged through the exhaust pipe at the top of the hollow box 21, then discharged from the battery through the existing air hole, and the solidified paraffin is recovered to solid state for reuse, thereby realizing the cycle of heat absorption and cooling.

[0038] Exemplarily, the inside of the shell 1 is provided with a protection assembly, which includes four groups of hollow metal plates 29 fixedly connected with the hollow box 21, the top of the metal plate 29 is provided with a plastic seal 30, the bottom of the inner cavity of the metal plate 29 is slidably connected with a bottom plate 31, the top of the hollow box 21 is provided with a horizontal bar 32, the top of the horizontal bar 11 is fixedly connected with a vertical bar 33, the vertical bar 33 penetrates the inside of the hollow box 21 and is fixedly connected with the bottom of the horizontal bar 32, the protection assembly further includes a bent bar 34 fixedly connected with the horizontal bar 32, the bottom of the bent bar 34 is located in the inside of the metal plate 29 and is fixedly connected with the bottom plate 31, the two ends of the bottom plate 31 are fixedly connected with the second spring 35, and the second spring 35 is in a compressed state, the top of the second spring 35 is fixedly connected with a top plate 36, and the bottom plate 31 and the top plate 36 are fixedly connected with a folded metal sheet 37.

[0039] Specifically, when the battery pack 2 is self-ignited due to short circuit or high temperature, the temperature in the shell 1 will abnormally rise, and the memory metal block 6 will be bent more, and the horizontal bar 11 will also rise higher, at this time, the horizontal bar 11 will rise higher with the horizontal bar 32 and the bent bar 34 through the vertical bar 33, because the bent bar 34 will rise higher relative to the heat dissipation state, so the force exerted by the bent bar 34 on the plastic seal 30 with the bottom plate 31 and the top plate 36 will increase, and the high temperature during self-ignition is much higher than the temperature generated during heat dissipation, so the plastic seal 30 will soften, and the top plate 36 will break through the softened plastic seal 30 at this time, after the plastic seal 30 is broken, the compressed second spring 35 will reset with the top plate 36 rising and with the folded metal sheet 37 unfolded, and the metal plate 29 and the unfolded metal sheet 37 form an isolation barrier around the surrounding battery cells, which can delay the spread of sparks and reduce the speed of self-ignition to provide escape time for the driver and passengers, thereby achieving temporary protection for the driver and passengers.

[0040] Working principle: through the set of high temperature protection structure, when the temperature sensor monitoring battery 2 temperature exceeds the safety threshold (that is, the battery temperature abnormal rise exists the risk of thermal runaway), at this time the high temperature through the conduction rod 7 to support frame 5 is finally given to the memory metal block 6, at the same time the high temperature through the air port 14 into the hollow box 4, increase the memory metal block 6 heating speed, or also can choose to install the exhaust fan at the air port 14 further increase the memory metal block 6 heating speed,

[0041] When the temperature of the memory metal block 6 exceeds the predetermined temperature, at this time the memory metal block 6 bends upward and provides an upward force, then the vertical plate 12 with the second copper block 13, horizontal rod 11 is raised, the horizontal rod 11 is stretched when the first spring 10, the second copper block 13 is raised and separated from the first copper block 8 to disconnect the circuit 3 to achieve overheat protection (as shown in the initial state, the circuit 3, the first copper block 8, the second copper block 13 together constitute the passage of the circuit 3), Figure 4

[0042] Through the setting of the delay component, when the second copper block 13 is raised to the two sides of the support plate 15, the electromagnet 20 is powered to generate strong magnetic force to attract pure iron 16, pure iron 16 is attracted into the inside of the air slot 19 under the action of strong magnetic force and compresses the elastic air cushion 17, which can complete the connection of the second copper block 13 and the support plate 15, then the timer 18 in the second copper block 13 starts timing, delays for a period of time (such as 5 minutes) and automatically unlocks (controls the electromagnet 20 to be deenergized, then under the reset action of the elastic air cushion 17, pure iron 16 is retracted from the air slot 19 to complete the unlocking), through the delay effect, the circuit can be protected to avoid damage to the battery due to multiple on-off in a short time,

[0043] When the battery temperature drops, the memory metal block 6 returns to its original state, and then the first spring 10 resets with the second copper block 13 to descend and recontact the first copper block 8 to make the circuit 3 be reconnected to be in an energized state,

[0044] Through the setting of the heat absorption and cooling component, when the horizontal rod 11 is raised, the sealing plate 28 (in order to facilitate Figure 9 viewing is not blocked, so the sealing plate 28 is not drawn in Figure 9 , please focus on watching Figure 6 ​The connection between the middle sealing plate 28 and the horizontal rod 11 is raised in the first chamber 23, so that the sealing plate 28 is separated from the position of the air vent 26, thereby opening the air vent 26, and then the high temperature of the battery pack enters through the air vent 26, and then the paraffin in the first chamber 23 is heated to become liquid, in which the paraffin absorbs a large amount of heat to achieve cooling, and then the liquid paraffin enters the second chamber 24 through the liquid discharge pipe 25, and then the micro pump 22 starts to pump the liquid paraffin into the first chamber 23, before which the condensation sheet (not shown in the figure) in the wall of the first chamber 23 is electrified to cool the first chamber 23, and then the liquid paraffin in the first chamber 23 is re-solidified at low temperature, and the heat released during solidification is discharged through the exhaust pipe at the top of the hollow box 21 (the exhaust pipe is not shown in the figure, and the exhaust pipe is provided with an electric valve which is only opened during exhaust), and then discharged from the battery through the existing exhaust hole, and then the solidified paraffin is recovered to the solid state for reuse, thereby realizing the circulation of heat absorption and cooling,

[0045] When the battery pack 2 does not catch fire, the metal sheet 37 in the metal plate 29 does not protrude, and the metal plate 29 remains in its original state, and the height of the original metal plate 29 is half the height of the battery pack 2, so it does not hinder air circulation, but when the battery pack 2 catches fire due to short circuit or high temperature, the temperature inside the shell 1 will abnormally rise, and then the memory metal block 6 will bend more, and the horizontal rod 11 will also rise higher, at this time the horizontal rod 11 will rise higher with the vertical rod 33, the bent rod 34 and the horizontal strip 32, because the bent rod 34 will rise higher relative to the heat dissipation state, so the force exerted by the bent rod 34 on the plastic sealing strip 30 with the top plate 36 will increase, and the high temperature during self-ignition is much higher than the temperature generated during heat dissipation, so the plastic sealing strip 30 will soften, and the top plate 36 will break through the softened plastic sealing strip 30 (the plastic sealing strip 30 is hard when the heat dissipation state, so the horizontal rod 11 does not move the top plate 36 to break through the plastic sealing strip 30 in the heat dissipation state, and the plastic sealing strip 30 is only broken when the battery catches fire), after the plastic sealing strip 30 is broken, the compressed second spring 35 will reset with the top plate 36 rising and the folded metal sheet 37 unfolding, and the metal plate 29 and the unfolded metal sheet 37 form a barrier to the surrounding battery cells, which can delay the spread of sparks and reduce the speed of self-ignition to provide escape time for the driver and passengers, thereby achieving temporary protection for the driver and passengers.

[0046] The above is only a preferred specific embodiment of the present application, but the protection scope of the present application is not limited thereto, and any skilled person in the art can make equivalent replacement or change within the technical scope disclosed by the present application according to the technical solution and inventive concept of the present application, which should be covered within the protection scope of the present application.

Claims

1. A new energy vehicle battery pack protection device, comprising: A battery pack (2) comprising a shell (1) and a battery cell, wherein a circuit (3) is provided on the outside of the shell (1), and the battery pack is characterized in that: a high-temperature protection structure is provided on the inside of the shell (1), the high-temperature protection structure comprises a hollow box (4), a support frame (5) is provided on the inside of the hollow box (4), a memory metal block (6) is fixed on the inside of the support frame (5), a conduction rod (7) is fixed on the inside of the shell (1), an end of the conduction rod (7) extends to the inside of the hollow box (4) and is connected to the metal support frame (5), an end of the circuit (3) is located on the inside of the hollow box (4) and is fixed with a A No. 1 copper block (8), a No. 1 notch (9) is provided on the back of the hollow box (4), a No. 1 spring (10) is fixed inside the No. 1 notch (9), a cross bar (11) is slidably connected inside the No. 1 notch (9), a vertical plate (12) is fixed at one end of the cross bar (11), the bottom of the vertical plate (12) contacts the top of the memory metal block (6), a vent (14) is passed through the back of the hollow box (4), a hollow No. 2 copper block (13) is provided on the vertical plate (12), and in the initial state, the No. 1 copper block (8) contacts the No. 2 copper block (13) to form a passage of the circuit (3).

2. A new energy vehicle battery pack protection device according to claim 1, characterized in that: A delay component is provided inside the hollow box (4), and the extension component comprises a support plate (15) fixed to the top of the inner cavity of the hollow box (4), the support plate (15) is slidably connected to a vertically distributed hollow pure iron (16), and an elastic air cushion (17) is fixed on one side of the support plate (15), and the elastic air cushion (17) is located in the hollow of the pure iron (16).

3. A new energy vehicle battery pack protection device according to claim 2, characterized in that: The delay assembly further includes a timer (18) inside the second copper block (13). Empty slots (19) are fixed on both sides of the second copper block (13), and an electromagnet (20) is installed inside the empty slots (19).

4. The new energy vehicle battery pack protection device according to claim 1, characterized in that: A hollow box (21) is provided inside the housing (1) on one side of the hollow box (4), and a heat absorption and cooling component is provided inside the hollow box (21). The heat absorption and cooling component includes a micro pump (22) installed on one side of the hollow box (21). The interior of the hollow box (21) is divided into a first chamber (23) and a second chamber (24). Solid paraffin is stored inside the first chamber (23), and the first chamber (23) is provided with a water retaining bar (38) and a drainage pipe (25).

5. A new energy vehicle battery pack protection device according to claim 4, characterized in that: The hollow box (21) is provided with a vent hole (26), and the back of the hollow box (21) is provided with a second slot (27) at the same horizontal position as the first slot (9). One end of the cross bar (11) passes through the first slot (9) and the second slot (27) and reaches the interior of the first chamber (23). A sealing plate (28) is fixed to one end of the cross bar (11).

6. A new energy vehicle battery pack protection device according to claim 4, characterized in that: The micro pump (22) is connected to a water pump pipe and a water discharge pipe, the water pump pipe is located inside the second chamber (24), and the water discharge pipe is located inside the first chamber (23).

7. The new energy vehicle battery pack protection device according to claim 1, characterized in that: A protective assembly is provided inside the housing (1), and the protective assembly includes four groups of hollow metal plates (29) fixedly connected to the hollow box (21), a plastic seal (30) is provided on the top of the metal plates (29), a bottom plate (31) is slidably connected to the bottom of the inner cavity of the metal plates (29), and a horizontal bar (32) is provided on the top of the hollow box (21).

8. The new energy vehicle battery pack protection device according to claim 1, characterized in that: A vertical rod (33) is fixed to the top of the cross bar (11), and the vertical rod (33) passes through the interior of the hollow box (21) and is fixedly connected to the bottom of the cross bar (32).

9. The new energy vehicle battery pack protection device according to claim 7, characterized in that: The protection assembly further includes a bent rod (34) fixedly connected to the horizontal bar (32), the bottom of the bent rod (34) is located inside the metal plate (29) and fixedly connected to the bottom plate (31), and a No. 2 spring (35) is fixed at both ends of the bottom plate (31), and the No. 2 spring (35) is in a compressed state.

10. A new energy vehicle battery pack protection device according to claim 9, characterized in that: A top plate (36) is fixed to the top of the No. 2 spring (35), and a folded metal sheet (37) is fixed between the bottom plate (31) and the top plate (36).

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