Umbrella-like power battery pack anti-collision device and control method thereof

Abstract

The invention discloses an umbrella-like power battery pack anti-collision device and a control method thereof. The device comprises a blade battery (1), a liquid cooling plate (2), an inner protection plate (3), a follow-up vibration stabilizer (4), a multi-machine umbrella device (5), a liquid inlet runner (6), an outer protection plate (7), a blade battery tab (8), a liquid cooling plate water inlet, a liquid outlet runner (10), foamed aluminum (11), a first pressure sensor (12) and a second pressure sensor. The control method comprises the following steps that safety pressure threshold values P1 and P2 are set, and a real-time pressure value Pg of the surface of the outer wall of the outer protection plate is compared with the safety pressure threshold value P1; if Pg is smaller than or equal to P1, the follow-up vibration stabilizer absorbs most impact energy; if Pg is larger than P1, the thousand-machine umbrella device is in an unfolded state; actually measuring the pressure value of the upper surface of the umbrella leaf, and judging the pressure value Px of the surface of the umbrella leaf and a safe pressure threshold P2: if Px is less than or equal to P2, the pressure sensing spring of the groove of the umbrella leaf does not generate thrust; and if Px is greater than P2, the pressure sensing spring buffers the impact force caused by collision.

Description

Technical Field

[0001] The invention relates to an umbrella-shaped power battery pack anti-collision device and a control method thereof, belonging to the technical field of power battery anti-collision safety. Background Art

[0002] As global environmental awareness grows, governments around the world are actively promoting policies such as industry, subsidies and environmental protection, which has led to a change in consumers' car-buying preferences. Environmentally friendly and energy-saving new energy vehicles are becoming more and more popular. The thermal management system of the power battery pack of new energy vehicles mostly adopts a liquid cooling system, and the importance of the liquid cooling water inlet channel as a key component of the liquid cooling system is self-evident. However, it faces many severe challenges in actual operation and urgently needs effective protection measures, especially the impact of collisions cannot be ignored.

[0003] The unique long strip design of the blade battery makes the four corners in the width direction become structural weak areas, and the stress concentration phenomenon is very significant. When encountering external impact or collision, these fragile corners are very easy to be damaged. Once the four corners are damaged, the risk of internal short circuit of the battery increases significantly, which is very likely to cause serious safety problems such as thermal runaway, such as fire and explosion, so it is necessary to design corresponding protective devices for the four corners of the blade battery.

[0004] Although some liquid cooling systems have taken certain protective measures for the water inlet channel, such as a simple external protective layer, the protective effect is limited. During the driving process, the vehicle will inevitably encounter bumps, vibrations and impacts from foreign objects, which may cause cracks and damage to the water inlet channel, causing coolant leakage, and further causing serious safety accidents such as battery short circuit and thermal runaway. Therefore, it is important to protect the water inlet and outlet channels on the basis of protecting the safety of the battery pack.

[0005] Therefore, it is necessary to design an umbrella-shaped power battery pack anti-collision device to solve the defects in the above technology. Summary of the invention

[0006] The purpose of the present invention is to solve the problems existing in the safety protection of existing blade batteries and to propose an umbrella-shaped power battery pack anti-collision device and a control method thereof.

[0007] The technical solution of the present invention is as follows: an umbrella-shaped power battery pack anti-collision device, including an inner protective plate, an outer protective plate, a liquid cooling plate, a follow-up vibration stabilizer and a thousand-machine umbrella device.

[0008] Four thousand-machine umbrella devices and a number of follow-up stabilizers are arranged between the inner protective plate and the outer protective plate, and foam is arranged between the inner protective plate and the outer protective plate; the inner protective plate is symmetrically distributed on both sides of the width direction of the blade battery; a liquid inlet channel or a liquid outlet channel is arranged on the side of the inner protective plate away from the blade battery, and an outer protective plate is installed on the other side of the liquid inlet channel or the liquid outlet channel.

[0009] The Thousand Machine Umbrella device comprises a middle rod, a sliding sleeve, a main bone, a secondary bone, an articulated seat, umbrella leaves and a buckle device. The middle rod is clearance-matched with the sliding sleeve through a guide rail, and the sliding sleeve is fixed at the guide rail slot of the middle rod through a buckle device. The sliding sleeve is hingedly connected to the four secondary bones along the circumference, and the four secondary bones are respectively hingedly connected to the four articulated seats along the circumference. The four articulated seats are respectively sleeve-connected to two umbrella leaves along the circumference, and every two umbrella leaves are respectively sleeve-connected to the four main bones along the circumference. The four main bones are hingedly connected to the top of the middle rod along the circumference. The bottom of the Thousand Machine Umbrella device is fixedly connected to the side of the inner protective plate away from the blade battery, and the top is fixedly connected to the inner wall of the outer protective plate.

[0010] The buckle device comprises a buckle block, a buckle spring and a limiting groove; the lower end of the buckle block is fixedly connected to the buckle spring, and the other end of the buckle spring is fixedly connected to the bottom of the limiting groove.

[0011] The umbrella surface of the Qianji umbrella device is provided with grooves, which are arranged around the circumference of the middle rod. A pressure sensing spring is arranged inside the groove, and the pressure sensing spring is fixedly connected to the bottom of the groove.

[0012] There are two slots on the middle stick of the Thousand Chance Umbrella device. The first slot at the bottom of the middle stick is the fixed position when the Thousand Chance Umbrella device is in a retracted state, and the second slot at the top of the middle stick is the fixed position when the Thousand Chance Umbrella device is in an expanded state.

[0013] A groove is provided on one side of the inner protective plate close to the blade battery, and the groove facilitates the connection of the pole ears between the blade battery monomers. A plurality of holes matching the branch flow channels are evenly opened in the middle of the inner protective plate along the length direction.

[0014] The liquid inlet channel is provided with a water inlet at the left end along the length direction, and the liquid outlet channel is provided with a water outlet at the right end along the length direction. The liquid inlet channel and the liquid outlet channel are in direct contact with a side of the inner protective plate away from the blade battery along a direction perpendicular to the channel, and in direct contact with the upper end of the inner protective plate groove along a direction perpendicular to the horizontal plane.

[0015] The liquid inlet channel and the liquid outlet channel are provided with a plurality of branch channels on the side close to the inner protective plate away from the blade battery, and the branch channels are respectively connected to the water inlet and outlet of the liquid cooling plate through threaded quick connectors; a one-way valve is provided at the connection between the branch pipe and the water inlet and outlet of the liquid cooling plate, and the flow direction of the one-way valve is from the liquid inlet channel to the branch pipe and from the branch pipe to the liquid outlet channel.

[0016] The surfaces of the liquid inlet flow channel and the liquid outlet flow channel are provided with a protective coating, and the protective coating comprises at least one of a polyurea coating, an epoxy resin coating and a polyester resin coating.

[0017] The follow-up stabilizers are evenly distributed along the edge line area except the four corners of the edge. The number of follow-up stabilizers is adjusted according to actual conditions. The follow-up stabilizers are fixedly connected to the side of the inner protective plate away from the blade battery and the inner wall of the outer protective plate.

[0018] A first pressure sensor is installed on the outer wall of the outer protective plate, and is installed at the geometric center of the outer protective plate; a second pressure sensor is installed on the upper surface of the umbrella leaf, and the number of the second pressure sensors is four to eight, which are respectively used to control the pressure sensing springs on the surface of each umbrella leaf. The second pressure sensors on the surface of the umbrella leaf will only operate when the Qianji Umbrella device is in the unfolded state.

[0019] There is foam aluminum between the inner protective plate and the outer protective plate; there is no foam aluminum around the thousand-machine umbrella device; the foam aluminum is melamine foam.

[0020] A control method for an umbrella-shaped power battery pack anti-collision device comprises the following steps: (1) Set the safety pressure thresholds P1 and P2. The first pressure sensor on the outer wall of the outer protective plate monitors the surface pressure value in real time. The second pressure sensor installed on the umbrella leaf of the Qianji umbrella device will only operate when the Qianji umbrella device is deployed to monitor the real-time pressure value on the umbrella leaf surface. (2) Compare the real-time pressure value Pg on the outer wall surface of the outer protection plate with the safety pressure threshold value P1; If Pg≤P1, the Qianji umbrella device maintains a retracted state under the action of the buckle device, the second pressure sensor on the surface of the umbrella leaf does not operate, and the follow-up vibration stabilizer absorbs most of the impact energy; If Pg>P1, the buckle block stuck in the first slot will shrink into the limiting slot under the action of the buckle spring, and the sliding sleeve will slide upward along the guide rail of the middle rod. When the buckle device rises to the position of the second slot, the buckle block will enter the second slot under the action of the buckle spring, and the Qianji Umbrella device will become unfolded. The upper surface of the umbrella leaf contacts the inner wall of the outer protective plate, increasing the contact area with the inner wall of the outer protective plate and providing greater support force. At the same time, the second pressure sensor on the upper surface of the umbrella leaf starts to operate, monitoring the pressure value on the upper surface of the umbrella leaf in real time, and judging the size of the pressure value Px on the surface of the umbrella leaf and the safety pressure threshold value P2: If Px≤P2, the pressure-sensing spring in the leaf groove does not generate thrust; If Px>P2, the pressure sensing spring in the groove of the umbrella leaf will form a corresponding thrust under the control of the second pressure sensor on the upper surface of the umbrella leaf to buffer the impact force caused by the collision; (3) If Pg≤P1, Px≤P2, the buckle block in the second slot will shrink into the limiting slot under the action of the buckle spring, and the sliding sleeve will slide down along the guide rail of the middle rod. When the buckle device descends to the position of the first slot, the buckle block will enter the first slot under the action of the buckle spring, and the Qianji umbrella device will return to the retracted state. At the same time, the second pressure sensor on the upper surface of the umbrella leaf stops operating; Among them, P1 and P2 are the safety pressure thresholds set by the system, P1≤P2; Pg and Px are the pressure values ​​measured by the system.

[0021] The anti-collision working principle of the Thousand Machine Umbrella device in the present invention is as follows: set safety pressure thresholds P1 and P2, and when the pressure value monitored in real time by the first pressure sensor on the outer wall of the outer protective plate does not exceed the set safety value P1, the Thousand Machine Umbrella device maintains a retracted state under the action of the buckle device. At this time, the buckle block of the buckle device is stuck in the first slot on the middle rod, and only the middle rod provides supporting force; when it exceeds the set safety value P1, the buckle block stuck in the first slot will shrink into the limiting slot under the action of the buckle spring, and the sliding sleeve will slide upward along the guide rail of the middle rod. When the buckle device rises to the second slot position on the middle rod, the buckle The block will enter the second slot under the action of the snap spring. At this time, the Qianji Umbrella device remains in the expanded state, and the upper surface of the umbrella leaf contacts the inner wall of the outer protective plate, increasing the contact area with the inner wall of the outer protective plate, while providing support force to buffer the impact force caused by the collision. At the same time, the second pressure sensor on the upper surface of the umbrella leaf starts to operate, and monitors the pressure value on the upper surface of the umbrella leaf in real time; when the pressure value of the second pressure sensor on the upper surface of the umbrella leaf exceeds the set safety value P2, the pressure sensing spring in the umbrella leaf groove will form a corresponding thrust under the control of the second pressure sensor on the upper surface of the umbrella leaf, so as to buffer the impact force caused by the collision.

[0022] The beneficial effect of the present invention is that the present invention is provided with four thousand-machine umbrella devices at the four corners between the inner protective plate and the outer protective plate of the blade power battery, a number of follow-up vibration stabilizers are provided at the non-corner edge, and the interior is filled with foam aluminum. The anti-collision and vibration stabilization problems of the blade power battery are well solved. The present invention uses pressure sensors arranged on the outer protective plate and the umbrella leaves to control the anti-collision device of the umbrella-shaped power battery pack. The liquid cooling system designed by the present invention plays an important role in protecting the water inlet and outlet channels on the basis of protecting the safety of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the structure of the explosion of the umbrella-shaped power battery pack anti-collision device of the present invention; Figure 2 It is a schematic structural diagram of the umbrella-shaped power battery pack anti-collision device of the present invention; Figure 3 It is a schematic structural diagram of the inner protective plate of the umbrella-shaped power battery pack anti-collision device of the present invention; Figure 4 It is a schematic structural diagram of the liquid inlet or outlet flow channel of the umbrella-shaped power battery pack anti-collision device of the present invention; Figure 5 It is a structural schematic diagram of the umbrella-shaped power battery pack anti-collision device of the present invention in the unfolded state of the Qianji Umbrella device; Figure 6 It is a structural schematic diagram of the retracted state of the thousand-machine umbrella device of the umbrella-shaped power battery pack anti-collision device of the present invention; Figure 7 It is a structural schematic diagram of a cross-sectional view of a sliding sleeve of a thousand-machine umbrella device of an umbrella-shaped power battery pack anti-collision device of the present invention; Figure 8 It is a structural schematic diagram of the induction buckle device of the umbrella-shaped power battery pack anti-collision device of the present invention; Fig. 9 This is a flow chart showing the principle of the protection control strategy of the umbrella-shaped power battery pack anti-collision device of the present invention; In the figure, 1 is a blade battery; 2 is a liquid cooling plate; 3 is an inner protective plate; 4 is a follow-up stabilizer; 5 is a Qianji umbrella device; 6 is a liquid flow channel; 7 is an outer protective plate; 8 is a blade battery pole ear; 9 is a water inlet of the liquid cooling plate; 10 is a liquid outlet channel; 11 is foam aluminum; 12 is a first pressure sensor; 301 is a hole; 302 is a groove of the inner protective plate; 501 is a first slot; 502 is a guide rail; 503 is a middle rod; 504 is an anti-slip sleeve; 505 is a secondary bone; 506 is a main bone; 507 is a hinged seat; 508 is an umbrella leaf; 509 is a groove; 510 is a pressure sensing spring; 511 is a second slot; 512 is a buckle device; 513 is a buckle block; 514 is a buckle spring; 515 is a limiting groove; 516 is a second pressure sensor; 601 is a branch flow channel; 602 is a water inlet. DETAILED DESCRIPTION

[0024] like Figure 1 As shown, the present embodiment is an umbrella-shaped power battery pack anti-collision device, including a blade battery 1, a liquid cooling plate 2, an inner protective plate 3, a follow-up vibration stabilizer 4, a thousand-machine umbrella device 5, a liquid inlet channel 6, an outer protective plate 7, a blade battery ear 8, a liquid cooling plate water inlet 9 and a liquid outlet channel 10.

[0025] like Figure 2 As shown, inner protective plates 3 are symmetrically provided on both sides along the width direction of the blade battery 1; a liquid inlet channel 6 or a liquid outlet channel 10 is provided on the side of the inner protective plate 3 away from the blade battery 1; an outer protective plate 7 is provided on the other side of the liquid inlet channel 6 or the liquid outlet channel 10; four thousand-machine umbrella devices 5 and a number of follow-up stabilizers 4 are provided between the inner protective plate 3 and the outer protective plate 7; and foam aluminum 11 is provided between the inner protective plate 3 and the outer protective plate 7.

[0026] like Figure 3 and Figure 4 As shown, the inner protective plate 3 of this embodiment is provided with an inner protective plate groove 302 on the side close to the blade battery 1. The inner protective plate groove 302 is for facilitating the connection of the pole ears 8 between the blade batteries 1. The inner protective plate 3 is provided with a channel 301 matching the branch flow channel 601 in the middle along the Z direction, which facilitates the installation of the branch flow channel 601 and the water inlet 9 of the liquid cooling plate.

[0027] The inlet flow channel 6 is provided with a water inlet 602 at the left end along the X direction (i.e., the length direction of the flow channel 6), and the outlet flow channel 10 is provided with a water outlet at the right end along the X direction (the length direction of the outlet flow channel). The inlet flow channel 6 and the outlet flow channel 10 are in direct contact with the side of the inner protective plate 3 away from the blade battery 1 along the Y direction (perpendicular to the horizontal direction of the outlet flow channel), and are in direct contact with the upper end of the inner protective plate groove 302 along the Z direction (perpendicular to the horizontal direction); The liquid inlet channel 6 and the liquid outlet channel 10 are provided with a plurality of branch channels 601 on one side close to the inner protective plate 3. The number of the branch channels 601 is the same as the number of the water inlet and outlet of the liquid cooling plate 2. The branch channels 601 are respectively connected to the water inlet 9 of the liquid cooling plate through threaded quick connectors to prevent leakage of the coolant, thereby affecting the blade battery 1 and the foam aluminum 11. A one-way valve is provided at the connection between the branch pipe 601 and the water inlet and outlet of the liquid cooling plate. The flow direction of the one-way valve is from the liquid inlet channel 6 to the branch channel and from the branch channel to the liquid outlet channel 10 to prevent the coolant in the branch pipe 601 from flowing back.

[0028] The surfaces of the liquid inlet channel 6 and the liquid outlet channel 10 are provided with a protective coating, which includes at least one of a polyurea coating, an epoxy resin coating and a polyester resin coating to prevent the liquid inlet channel 6 and the liquid outlet channel 10 from being damaged and causing leakage in extreme cases, thereby affecting the blade battery 1 and the foam aluminum 11.

[0029] like Figure 2 As shown, the follower stabilizer 4 adopts an edge non-corner arrangement, and the follower stabilizer 4 is fixedly connected to the side of the inner protective plate 3 away from the blade battery 1 and the inner wall of the outer protective plate 7; when a collision impact occurs on the side of the blade battery, the follower stabilizer 4 can absorb most of the impact energy and consume the energy through internal energy. At the same time, the foam aluminum 11 filled between the inner protective plate 3 and the outer protective plate 7 can protect the liquid inlet channel 6 and the liquid outlet channel 10, preventing the liquid inlet channel 6 or the liquid outlet channel 10 from breaking in the collision and causing cooling liquid leakage, thereby protecting the blade battery 1.

[0030] like Figure 5 and Figure 7 As shown, the Thousand Machine Umbrella device 5 of this embodiment includes a middle rod 503, a sliding sleeve 504, a main bone 506, a secondary bone 505, a hinge seat 507, an umbrella leaf 508 and a buckle device 512. The middle rod 503 is clearance-matched with the sliding sleeve 504 through the guide rail 502; the sliding sleeve 504 is fixed at the middle rod guide rail slot through the buckle device 512; the sliding sleeve 504 is hingedly connected with four secondary bones 505 along the circumference, and the four secondary bones 505 are hingedly connected with four hinge seats 507 along the circumference; the four hinge seats 507 are respectively connected with two umbrella leaves 508 along the circumference, and every two umbrella leaves 508 are respectively connected with four main bones 506 along the circumference, and the four main bones 506 are hingedly connected with the top of the middle rod 503 along the circumference; the bottom of the Thousand Machine Umbrella device 5 is fixedly connected with the side of the inner protective plate 3 away from the blade battery 1, and the top is fixedly connected with the inner wall of the outer protective plate 7.

[0031] like Figure 8 As shown, the snap-in device 512 of this embodiment includes a snap-in block 513, a snap-in spring 514, and a limiting groove 515. The lower end of the snap-in block 513 is fixedly connected to the snap-in spring 514, and the other end of the snap-in spring 514 is fixedly connected to the bottom of the limiting groove 515.

[0032] like Figure 6 and Figure 7 As shown, there are two slots on the middle rod 503 of the Thousand Machine Umbrella device of this embodiment. The snap block of the snap device 512 is snapped at the first snap slot 501 at the bottom of the middle rod 503, so that the Thousand Machine Umbrella device 5 maintains a retracted state; the snap block of the snap device 512 is snapped at the second snap slot 511 at the top of the middle rod 503, so that the Thousand Machine Umbrella device 5 is changed to an expanded state.

[0033] A groove 509 is left on the upper surface of the leaf 508 of the Qianji umbrella device of this embodiment. The grooves 509 are arranged in a circle around the middle rod 503. A pressure sensing spring 510 is provided in the groove 509. The pressure sensing spring 510 is fixedly connected to the bottom of the groove 509.

[0034] like Figure 2 and Figure 6As shown, a first pressure sensor 12 is installed on the outer wall of the outer protective plate 7 of this embodiment, and a second pressure sensor 516 is installed on the upper surface of the umbrella leaf 508. The second pressure sensor 516 on the upper surface of the umbrella leaf 508 will only operate when the Qianji umbrella device 5 is in the unfolded state.

[0035] In this embodiment, when the pressure value of the outer wall of the outer protective plate 7 does not exceed the safety threshold of the first pressure sensor 12 on the surface of the outer protective plate 7, the Qianji umbrella device 5 will remain in a retracted state under the action of the buckle block 513 of the buckle device 512 being stuck in the first clamping groove 501, and at the same time, the second pressure sensor 516 on the upper surface of the umbrella leaf 508 of the Qianji umbrella device does not operate and the pressure sensing spring 510 in the umbrella leaf groove 509 does not work; when the pressure value of the outer wall of the outer protective plate 7 exceeds the safety threshold of the first pressure sensor 12 on the surface of the outer protective plate 7, the buckle block 513 stuck in the first clamping groove 501 is not in operation. 13 will shrink into the limiting groove 515 under the action of the buckle spring 514, and the sliding sleeve 504 will slide upward along the guide rail 502 of the middle rod 503. When the buckle device 512 rises to the position of the second buckle groove 511, the buckle block 513 will enter the second buckle groove 511 under the action of the buckle spring 514, and the Qianji umbrella device 5 will become deployed. The upper surface of the umbrella leaf 508 contacts the inner wall of the outer protective plate 7, increasing the contact area with the inner wall of the outer protective plate 7 and providing greater supporting force. At the same time, the second pressure sensor 516 on the upper surface of the umbrella leaf 508 starts to operate, monitoring the umbrella in real time. The pressure value on the upper surface of the leaf 508, when the pressure value on the upper surface of the leaf 508 does not exceed the safety threshold, the pressure sensing spring 510 in the leaf groove 509 does not play a role; when the pressure value on the upper surface of the leaf 508 exceeds the safety threshold, the pressure sensing spring 510 in the leaf groove 509 will form a corresponding thrust under the control of the second pressure sensor 516 on the upper surface of the leaf 508, to buffer the impact force caused by the collision, thereby protecting the liquid inlet channel 6, the liquid outlet channel 10 and the blade battery; if the pressure value on the upper surface of the leaf 508 is lower than the safety threshold, then The buckle block 513 of the second slot 511 will shrink into the limiting slot 515 under the action of the buckle spring 514, and the sliding sleeve 504 will slide downward along the guide rail 502 of the middle rod 503. When the buckle device 512 drops to the position of the first slot 501, the buckle block 513 will enter the first slot 501 under the action of the buckle spring 514, and the Thousand Machine Umbrella Device 5 will return to the contracted state. At the same time, the second pressure sensor 516 on the upper surface of the umbrella leaf 508 stops running. The Thousand Machine Umbrella Device 5 adopts a four-corner arrangement to improve the impact resistance of the four side corners of the blade battery along the width direction.

[0036] In this embodiment, there is foam aluminum 11 between the inner protective plate 3 and the outer protective plate 7. The foam aluminum 11 can protect the liquid inlet channel 6 and the liquid outlet channel 10. There is no foam aluminum 11 around the thousand-machine umbrella device 5, which facilitates the deployment of the thousand-machine umbrella device 5. The foam aluminum 11 is made of melamine foam.

[0037] This embodiment provides a control method for an umbrella-shaped power battery pack anti-collision device, which provides side protection for blade batteries, liquid inlet channels, and liquid outlet channels; and comprises the following steps: S1: Set the safety pressure thresholds P1 and P2. The first pressure sensor on the outer wall of the outer protective plate monitors the surface pressure value in real time. The second pressure sensor installed on the leaves of the Qianji umbrella device will only operate when the Qianji umbrella device is unfolded to monitor the real-time pressure value on the surface of the leaves.

[0038] S2: Determine and compare the real-time pressure value Pg on the outer wall surface of the outer protection plate with the safety pressure threshold value P1: S21: If Pg≤P1, the Qianji Umbrella device maintains a retracted state under the action of the buckle device, the second pressure sensor on the surface of the umbrella leaf does not operate, and the follow-up vibration stabilizer absorbs most of the impact energy.

[0039] S22: If Pg>P1, the buckle block stuck in the first slot will shrink into the limiting slot under the action of the buckle spring, and the sliding sleeve will slide upward along the guide rail of the middle rod. When the buckle device rises to the position of the second slot, the buckle block will enter the second slot under the action of the buckle spring, and the Qianji Umbrella device will become unfolded. The upper surface of the umbrella leaf contacts the inner wall of the outer protective plate, increasing the contact area with the inner wall of the outer protective plate and providing greater support force. At the same time, the second pressure sensor on the upper surface of the umbrella leaf starts to operate, monitors the pressure value on the upper surface of the umbrella leaf in real time, and judges and compares the pressure value Px on the surface of the umbrella leaf with the safety pressure threshold value P2: S221: If Px≤P2, the pressure sensing spring in the umbrella leaf groove does not generate thrust; S222: If Px>P2, the pressure sensing spring in the umbrella leaf groove will form a corresponding thrust under the control of the second pressure sensor on the upper surface of the umbrella leaf to buffer the impact force caused by the collision.

[0040] S3: If Pg≤P1, Px≤P2, the buckle block in the second slot will shrink into the limiting slot under the action of the buckle spring, and the sliding sleeve will slide downward along the guide rail of the middle rod. When the buckle device descends to the position of the first slot, the buckle block will enter the first slot under the action of the buckle spring, and the Qianji umbrella device will return to the retracted state. At the same time, the second pressure sensor on the upper surface of the umbrella leaf stops running.

[0041] Among them, P1 and P2 are the safety pressure thresholds set by the system (P1≤P2), and Pg and Px are the pressure values ​​measured by the system.

[0042] The control method of the umbrella-shaped power battery pack anti-collision device of the present embodiment detects the pressure value on the surface of the outer protective plate in real time when the outer protective plate of the power battery pack collides. When the surface pressure value does not exceed the set safety threshold, the follow-up vibration stabilizer can absorb most of the impact energy and consume the energy through internal energy. At the same time, the foam aluminum filled between the inner protective plate and the outer protective plate can protect the liquid inlet channel and the liquid outlet channel; when the surface pressure value exceeds the set safety threshold, the thousand-machine umbrella device will change from a contracted state to an expanded state, increasing the contact area between the thousand-machine umbrella device and the inner wall of the outer protective plate to provide greater supporting force. At the same time, the pressure sensing spring in the umbrella leaf groove will form a corresponding thrust under the control of the second pressure sensor on the upper surface of the umbrella leaf, buffering the impact force caused by the collision, thereby protecting the liquid inlet channel, the liquid outlet channel and the blade battery; if the pressure value on the upper surface of the umbrella leaf is lower than the safety threshold, the thousand-machine umbrella device will return to the contracted state, and the second pressure sensor on the upper surface of the umbrella leaf will stop running.

Claims

1. An umbrella-shaped power battery pack anti-collision device, comprising an inner protective plate and an outer protective plate, characterized in that: The device also includes a liquid cooling plate, a follow-up vibration stabilizer and a thousand-machine umbrella device; four thousand-machine umbrella devices and a plurality of follow-up vibration stabilizers are arranged between the inner protective plate and the outer protective plate, and foam is arranged between the inner protective plate and the outer protective plate; the inner protective plate is arranged symmetrically on both sides of the blade battery in the width direction; a liquid inlet channel or a liquid outlet channel is arranged on one side of the inner protective plate away from the blade battery, and an outer protective plate is installed on the other side of the liquid inlet channel or the liquid outlet channel; The Thousand Machine Umbrella device comprises a middle rod, a sliding sleeve, a main bone, a secondary bone, an articulated seat, an umbrella leaf and a buckle device. The middle rod is clearance-matched with the sliding sleeve through a guide rail, and the sliding sleeve is fixed at the guide rail slot of the middle rod through a buckle device. The sliding sleeve is hingedly connected to the four secondary bones along the circumference, and the four secondary bones are respectively hingedly connected to the four articulated seats along the circumference. The four articulated seats are respectively sleeve-connected to two umbrella leaves along the circumference, and each two umbrella leaves are respectively sleeve-connected to the four main bones along the circumference. The four main bones are hingedly connected to the top of the middle rod along the circumference. The bottom of the Thousand Machine Umbrella device is fixedly connected to the side of the inner protective plate away from the blade battery, and the top is fixedly connected to the inner wall of the outer protective plate. The buckle device comprises a buckle block, a buckle spring and a limiting groove; the lower end of the buckle block is fixedly connected to the buckle spring, and the other end of the buckle spring is fixedly connected to the bottom of the limiting groove; The umbrella surface of the Qianji umbrella device has grooves, which are arranged around the circumference of the middle rod. A pressure sensing spring is arranged in the groove, and the pressure sensing spring is fixedly connected to the bottom of the groove; There are two slots on the middle stick of the Thousand Chance Umbrella device. The first slot at the bottom of the middle stick is the fixed position when the Thousand Chance Umbrella device is in a retracted state, and the second slot at the top of the middle stick is the fixed position when the Thousand Chance Umbrella device is in an expanded state.

2. The umbrella-shaped power battery pack anti-collision device according to claim 1, characterized in that: A groove is provided on one side of the inner protective plate close to the blade battery, and the groove facilitates the connection of the pole ears between the blade battery monomers. A plurality of holes matching the branch flow channels are evenly opened in the middle of the inner protective plate along the length direction.

3. The umbrella-shaped power battery pack anti-collision device according to claim 1, characterized in that: The inlet flow channel is provided with a water inlet at the left end along the length direction, and the outlet flow channel is provided with a water outlet at the right end along the length direction. The inlet flow channel and the outlet flow channel are in direct contact with a side of the inner protective plate away from the blade battery in a direction perpendicular to the flow channel, and are in direct contact with an upper end of the inner protective plate groove in a direction perpendicular to the horizontal plane; The liquid inlet flow channel and the liquid outlet flow channel are provided with a plurality of branch flow channels on the side close to the inner protective plate away from the blade battery, and the branch flow channels are respectively connected to the water inlet and outlet of the liquid cooling plate through threaded quick connectors; the connection between the branch pipeline and the water inlet and outlet of the liquid cooling plate is provided with a one-way valve, and the flow direction of the one-way valve is that the liquid inlet flow channel flows to the branch pipeline and the branch pipeline flows to the liquid outlet flow channel; The surfaces of the liquid inlet flow channel and the liquid outlet flow channel are provided with a protective coating, and the protective coating comprises at least one of a polyurea coating, an epoxy resin coating and a polyester resin coating.

4. The umbrella-shaped power battery pack anti-collision device according to claim 1, characterized in that: The follow-up vibration stabilizer is evenly distributed along the edge line area except the four corners of the edge, and the follow-up vibration stabilizer is fixedly connected to the side of the inner protective plate away from the blade battery and the inner wall of the outer protective plate.

5. The umbrella-shaped power battery pack anti-collision device according to claim 1, characterized in that: A first pressure sensor is installed on the outer wall of the outer protective plate, and a second pressure sensor is installed on the upper surface of the umbrella leaf. The second pressure sensor on the surface of the umbrella leaf will only operate when the Qianji umbrella device is in the unfolded state.

6. The umbrella-shaped power battery pack anti-collision device according to claim 1, characterized in that: There is foam aluminum between the inner protective plate and the outer protective plate; there is no foam aluminum around the thousand-machine umbrella device; the foam aluminum is melamine foam.

7. A control method for a power battery anti-collision device using the umbrella-shaped power battery pack anti-collision device according to any one of claims 1 to 6, characterized in that: The method steps are as follows: (1) Set the safety pressure thresholds P1 and P2. The first pressure sensor on the outer wall of the outer protective plate monitors the surface pressure value Pg in real time. The second pressure sensor installed on the umbrella leaf of the Qianji umbrella device will only operate when the Qianji umbrella device is deployed to monitor the real-time pressure value on the umbrella leaf surface. (2) Compare the real-time pressure value Pg on the outer wall surface of the outer protection plate with the safety pressure threshold value P1; If Pg≤P1, the Qianji umbrella device maintains a retracted state under the action of the buckle device, the second pressure sensor on the surface of the umbrella leaf does not operate, and the follow-up vibration stabilizer absorbs most of the impact energy; If Pg>P1, the buckle block stuck in the first slot will shrink into the limiting slot under the action of the buckle spring, and the sliding sleeve will slide upward along the guide rail of the middle rod. When the buckle device rises to the position of the second slot, the buckle block will enter the second slot under the action of the buckle spring, and the Qianji Umbrella device will become unfolded. The upper surface of the umbrella leaf contacts the inner wall of the outer protective plate, increasing the contact area with the inner wall of the outer protective plate and providing greater support force. At the same time, the second pressure sensor on the upper surface of the umbrella leaf starts to operate, monitoring the pressure value on the upper surface of the umbrella leaf in real time, and judging the size of the pressure value Px on the surface of the umbrella leaf and the safety pressure threshold value P2: If Px≤P2, the pressure-sensing spring in the leaf groove does not generate thrust; If Px>P2, the pressure sensing spring in the groove of the umbrella leaf will form a corresponding thrust under the control of the second pressure sensor on the upper surface of the umbrella leaf to buffer the impact force caused by the collision; (3) If Pg≤P1, Px≤P2, the buckle block in the second slot will shrink into the limiting slot under the action of the buckle spring, and the sliding sleeve will slide down along the guide rail of the middle rod. When the buckle device descends to the position of the first slot, the buckle block will enter the first slot under the action of the buckle spring, and the Qianji umbrella device will return to the retracted state. At the same time, the second pressure sensor on the upper surface of the umbrella leaf stops operating; Among them, P1 and P2 are the safety pressure thresholds set by the system, P1≤P2; Pg and Px are the pressure values ​​measured by the system.

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