A battery pack auxiliary cooling mechanism

Abstract

The present invention discloses an auxiliary cooling mechanism for a battery pack, comprising: a box body, a temperature control device, a boosting mechanism, a nozzle mechanism and a control device. A battery module is arranged inside the box body. The temperature control device includes a circulating cooling pipe through which a coolant flows. The boosting mechanism includes a boosting component and a first temperature detector. The boosting component is installed on the circulating cooling pipe and is used to pressurize the circulating cooling pipe. The nozzle mechanism includes a nozzle component and a second temperature detector. The nozzle component is fixedly installed on the circulating cooling pipe and is used to spray the coolant onto the battery module. The control device is communicatively connected to the first temperature detector and the second temperature detector, and is electrically connected to the boosting component and the nozzle component. When the temperature detector detects that the temperature inside the box body rises to a threshold value, the control device controls the boosting mechanism and the nozzle mechanism to start and spray the coolant onto the battery module, so as to perform the functions of cooling and fire extinguishing, and control the temperature inside the battery pack through physical condition triggering factors.

Description

Technical Field

[0001] The present invention relates to the technical field of temperature control of electric vehicle battery packs, and particularly to an auxiliary cooling mechanism for a battery pack. Background Art

[0002] With the development of the electric vehicle industry, the market retention components have increased, and the improvement of battery energy density has been even more rapid. The safety of electric vehicles, especially the fire of electric vehicles, is a problem that the industry and the market attach great importance to at present. The current mainstream technologies are mainly heat insulation structures, heat insulation pads or fire extinguishing agents to delay the development time of heat diffusion, with poor temperature control effect and unable to effectively control the temperature inside the battery pack, which is likely to cause greater losses to the whole vehicle. Summary of the Invention

[0003] The main object of the present invention is to propose an auxiliary cooling mechanism for a battery pack, aiming to solve the problem that when the temperature of the existing electric vehicle battery pack rises, it cannot be effectively controlled, resulting in greater losses.

[0004] To achieve the above object, an auxiliary cooling mechanism for a battery pack proposed by the present invention includes:

[0005] A box body, in which a battery module is provided;

[0006] A temperature control device, fixedly installed in the box body, the temperature control device includes a circulating cooling pipe arranged on one side of the battery module, and a coolant is passed through the circulating cooling pipe;

[0007] A boosting mechanism, including a boosting component and a first temperature detector, the boosting component is installed on the circulating cooling pipe for pressurizing the circulating cooling pipe;

[0008] A spray head mechanism, including a spray head component and a second temperature detector, the spray head component is fixedly installed on the circulating cooling pipe and is arranged corresponding to the battery module for spraying the coolant onto the battery module; and,

[0009] A control device, communicatively connected to the first temperature detector and the second temperature detector, and electrically connected to the boosting component and the spray head component;

[0010] Wherein, the boosting component and the spray head component are in a normally closed state. When the first temperature detector detects that the temperature in the box body reaches a threshold value, the control device controls the boosting component to open, and the boosting component pressurizes the circulating cooling pipe; when the second temperature detector detects that the temperature in the box body reaches the threshold value, the control device controls the spray head component to open, and the spray head component sprays the coolant onto the battery module.

[0011] Optionally, the boosting component includes a booster pump and a gas tank. The output end of the booster pump is connected to the circulating cooling pipe, and the input end of the booster pump is connected to the gas tank to boost the gas in the gas tank and output it into the circulating cooling pipe.

[0012] Optionally, the boosting mechanism further includes a first sealing component installed between the booster pump and the circulating cooling pipe. The first sealing component includes:

[0013] A first seal fixed between the output end of the booster pump and the circulating cooling pipe to block the connection between the boosting component and the circulating cooling pipe;

[0014] A first ejector rod movably installed on one side of the first seal. The first ejector rod has a first piercing position on its moving stroke to pierce the first seal; and,

[0015] A first driving device connected to the first ejector rod to drive the first ejector rod.

[0016] Optionally, the control device is electrically connected to the first driving device and the booster pump respectively. When the first temperature detector detects that the temperature in the box reaches the threshold, the control device controls the first driving device to drive the first ejector rod to move to the first piercing position and controls the booster pump to start. The booster pump boosts the gas in the gas tank and outputs it into the circulating cooling pipe.

[0017] Optionally, the boosting mechanism further includes a pressure detector communicatively connected to the control device. When the pressure detector detects that the pressure in the box reaches the threshold, the control device controls the first driving device to drive the first ejector rod to move to the first piercing position and controls the booster pump to start. The booster pump boosts the gas in the gas tank and outputs it into the circulating cooling pipe.

[0018] Optionally, the nozzle assembly includes a nozzle and a second sealing component. The second sealing component is disposed between the nozzle and the circulating cooling pipe. The second sealing component includes:

[0019] A second seal fixed between the nozzle and the circulating cooling pipe to block the connection between the nozzle and the circulating cooling pipe;

[0020] A second ejector rod movably disposed on the side of the second seal facing the circulating cooling pipe. The second ejector rod has a second piercing position on its moving stroke to pierce the second seal; and,

[0021] A second driving device connected to the second ejector rod to drive the second ejector rod to move.

[0022] Optionally, the second driving device is electrically connected to the control device. When the second temperature detector detects that the temperature inside the box reaches the threshold value, the control device controls the second driving device to drive the second ejector rod to move to the second puncturing position.

[0023] Wherein, the second ejector rod is provided with a stop portion, which is arranged at the connection between the circulating cooling pipe and the spray head assembly, and is used to provide resistance in the direction of the circulating cooling pipe to fix the second ejector rod. When the pressure in the circulating cooling pipe increases and the thrust of the circulating cooling pipe on the second ejector rod towards the second sealing member is greater than the resistance, the second ejector rod overcomes the resistance and moves to the second puncturing position.

[0024] Optionally, the circulating cooling pipe includes an inlet pipe and an outlet pipe, which are respectively installed on both sides of the battery module. The temperature control device further includes a liquid cooling plate, which is connected between the inlet pipe and the outlet pipe. The liquid cooling plate is fixedly arranged under the battery module and abuts against the battery module to adjust the temperature of the battery module.

[0025] Optionally, the number of the boosting mechanisms is one or more, and the number of the spray head mechanisms is one or more.

[0026] Optionally, the number of the boosting mechanisms is one, and the boosting mechanism is installed on the inlet pipe or the outlet pipe. One or more spray head mechanisms are installed on the inlet pipe or the outlet pipe corresponding to the boosting mechanism; or,

[0027] The number of the boosting mechanisms is multiple, and all the multiple boosting mechanisms are installed on the inlet pipe or the outlet pipe. One or more spray head mechanisms are installed on the inlet pipe or the outlet pipe corresponding to all the boosting mechanisms; or,

[0028] The number of the boosting mechanisms is multiple, and the multiple boosting mechanisms are respectively installed on the inlet pipe and the outlet pipe. The multiple spray head mechanisms are respectively installed on the inlet pipe and the outlet pipe corresponding to the boosting mechanisms.

[0029] In the technical solution provided by the present invention, a boosting mechanism and a nozzle mechanism are installed on the circulating cooling pipe of the temperature control device. The boosting mechanism includes a boosting component and a first temperature detector. The boosting component is installed on the circulating cooling pipe and is used to pressurize the circulating cooling pipe. The nozzle mechanism includes a nozzle component and a second temperature detector. The nozzle component is fixedly installed on the circulating cooling pipe and is arranged corresponding to the battery module, and is used to spray the coolant in the circulating cooling pipe onto the battery module. The control device is communicatively connected to the first temperature detector and the second temperature detector, and is electrically connected to the boosting component and the nozzle component. In the normal operating state of the battery pack, the boosting component and the nozzle component are in a normally closed state. If an abnormality occurs in the battery components in the box, resulting in a rapid increase in the temperature in the box, when the first temperature detector detects that the temperature in the box reaches the threshold, the control device controls the boosting component to open, and the boosting component pressurizes the circulating cooling pipe; when the second temperature detector detects that the temperature in the box reaches the threshold, the control device controls the nozzle component to open, and the nozzle component sprays the coolant pressurized by the boosting component onto the battery module. Both the boosting mechanism and the nozzle mechanism are activated according to the physical variable reaching the threshold, and the control is stable, which can effectively control the temperature in the battery pack and avoid further expansion of losses. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] 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 use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0031] Figure 1 It is an exploded structural schematic diagram of an embodiment of the battery pack auxiliary cooling mechanism provided by the present invention;

[0032] Figure 2 is Figure 1 the assembled structural schematic diagram of the temperature control device, the boosting mechanism and the nozzle mechanism in

[0033] Figure 3 is Figure 1 the structural schematic diagram of the boosting mechanism in

[0034] Figure 4 is Figure 1 the structural schematic diagram of the nozzle mechanism in

[0035] Figure 5 is Figure 1Block diagram of the connection structure between the control device, the boost mechanism, and the nozzle mechanism.

[0036] Explanation of the reference numerals in the drawings:

[0037]

[0038] The realization, functional features, and advantages of the present invention will be further described in conjunction with the embodiments and with reference to the accompanying drawings. Detailed implementation manners

[0039] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with 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 the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0040] It should be noted that if there are directional indications (such as up, down, left, right, front, back,...) involved in the embodiments of the present invention, then the directional indications are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the drawings). If the specific posture changes, the directional indications will also change accordingly.

[0041] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, then the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and / or" appearing throughout the text includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or a solution that satisfies both A and B simultaneously. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement it. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0042] With the development of the electric vehicle industry, the market retention components have increased, and the battery energy density has increased even more rapidly. The safety of electric vehicles, especially the fire of electric vehicles, is a very important issue in the current industry and market. The current mainstream technologies are mainly based on heat insulation structures, heat insulation pads, or fire extinguishing agents to delay the development time of heat diffusion, and the temperature control effect is poor, unable to effectively control the temperature inside the battery pack, and it is easy to cause greater losses to the whole vehicle.

[0043] To solve the above problems, the present invention provides an auxiliary cooling mechanism for a battery pack.Figures 1 to 5 This is a specific embodiment of the battery pack auxiliary cooling mechanism provided by the present invention.

[0044] See also Figures 1 to 5 In this embodiment, the battery pack auxiliary cooling mechanism includes a box body 1, a temperature control device 2, a boosting mechanism 3, a nozzle mechanism 4 and a control device 5. The box body 1 is provided with a battery module 11, and the temperature control device 2 is fixedly installed in the box body 1. The temperature control device 2 includes a circulating cooling pipe 21 arranged on one side of the battery module 11, and the circulating cooling pipe 21 is filled with coolant. The boosting mechanism 3 includes a boosting component 31 and a first temperature detector 33. The boosting component 31 is installed on the circulating cooling pipe 21 for pressurizing the circulating cooling pipe 21. The nozzle mechanism 4 includes a nozzle component 41 and a second temperature detector 42. The nozzle assembly 41 is fixedly mounted on the circulating cooling pipe 21 and is arranged corresponding to the battery module 11, so as to spray the coolant to the battery module 11. The control device 5 is connected to the first temperature detector 33 and the second temperature detector 42 in communication, and is electrically connected to the boost assembly 31 and the nozzle assembly 41. The boost assembly 31 and the nozzle assembly 41 are in a normally closed state when the temperature in the box 1 is normal. If the battery module 11 works abnormally, it may cause the temperature in the box 1 to rise. When the first temperature detector 33 detects that the temperature in the box 1 reaches a threshold value, a signal is emitted to the battery module 11. The control device 5 controls the boost component 31 to open after receiving the signal, and the boost component 31 pressurizes the coolant in the circulating cooling pipe 21; when the second temperature detector 42 detects that the temperature in the box 1 reaches the threshold, it sends a signal to the control device 5, and the control device 5 controls the nozzle component 41 to open after receiving the signal sent by the second temperature detector 42, and the nozzle component 41 sprays the coolant pressurized by the boost component 31 to the battery module 11, cools the battery module 11 or extinguishes the fire, thereby realizing the control of the opening of the cooling mechanism by physical variables. When the battery module 11 has an abnormal temperature rise, allowing it to develop is likely to cause a fire and cause irreparable consequences. In the technical solution of the present application, by detecting the temperature change in the box body 1, when the temperature in the box body 1 rises to the set threshold, the boost component 31 and the nozzle component 41 are turned on to spray the coolant directly to the battery component for cooling. The triggering conditions are stable, which can effectively suppress the temperature in the box body 1 from continuing to rise and avoid causing greater losses. Moreover, the boost mechanism 3 and the nozzle mechanism 4 are directly connected to the temperature control device 2 in the vehicle, making full use of the original liquid working fluid resources to carry out cooling work. The transformation is simple and easy to promote.

[0045] It should be noted that the temperature threshold in the box body 1 is a preset temperature value, which is obtained through research and calculation. Since the actual working conditions are different, it is not limited here. It can be understood that the thresholds set by the first temperature detector 33 and the second temperature detector 42 are the same.

[0046] Furthermore, the boosting component 31 includes a booster pump 312 and a gas tank 311. The output end of the booster pump 312 is connected to the circulating cooling pipe 21, and the input end of the booster pump 312 is connected to the gas tank 311, so as to boost the gas in the gas tank 311 and output it into the circulating cooling pipe 21, so that the pressure of the coolant in the circulating cooling pipe 21 increases. In this embodiment, the gas in the gas tank 311 is driven by chlorine-type gas, which can reach extremely high pressure, has no electric arc and no spark, and has a high safety level.

[0047] In this embodiment, the boosting mechanism 3 further includes a first sealing component 32, which is installed between the booster pump 312 and the circulating cooling pipe 21 and is used to separate the boosting component 31 and the circulating cooling pipe 21. The first sealing component 32 includes a first seal 321, a first ejector rod 322 and a first driving device 323. The first seal 321 is fixedly installed between the output end of the booster pump 312 and the circulating cooling pipe 21 to block the connection between the boosting component 31 and the circulating cooling pipe 21. The first seal 321 is a diaphragm. The first ejector rod 322 is movably installed on one side of the first seal 321. The first ejector rod 322 has a first piercing position on its moving stroke to pierce the first seal 321. The first driving device 323 is connected to the first ejector rod 322 to drive the first ejector rod 322 to move.

[0048] Furthermore, the control device 5 is electrically connected to the first driving device 323 and the booster pump 312 respectively. When the first temperature detector 33 detects that the temperature in the box body 1 reaches the threshold, the control device 5 controls the first driving device 323 to drive the first ejector rod 322 to move to the first piercing position. The first ejector rod 322 pierces the first seal 321 to connect the output end of the booster pump 312 and the circulating cooling pipe 21. At the same time, the control device 5 controls the booster pump 312 to start, and the booster pump 312 boosts the gas in the gas tank 311 and outputs it into the circulating cooling pipe 21.

[0049] In this embodiment, the nozzle assembly 41 includes a nozzle 411 and a second sealing assembly 412. The second sealing assembly 412 is disposed between the nozzle 411 and the circulating cooling pipe 21. The second sealing assembly 412 includes a second seal 412a, a second ejector rod 412b, and a second driving device 412c. The second seal 412a is fixedly installed between the nozzle 411 and the circulating cooling pipe 21. The second seal 412a is a diaphragm that completely seals the connection between the nozzle 411 and the circulating cooling pipe 21 to block the connection between the nozzle 411 and the circulating cooling pipe 21. The second ejector rod 412b is movably disposed on the side of the second seal 412a facing the circulating cooling pipe 21 and has a second piercing position on its moving stroke for piercing the second seal 412a. The second driving device 412c is connected to the second ejector rod 412b to drive the second ejector rod 412b to move.

[0050] It should be noted that the nozzle 411 is arranged facing the battery module 11 to be cooled, so that the coolant can be directly sprayed onto the heat source after being ejected to cool down at the fastest speed. The nozzle 411 can also be arranged with an opening obliquely upward to achieve large-area spraying and comprehensive cooling.

[0051] Further, the second driving device 412c is electrically connected to the control device 5. When the second temperature detector 42 detects that the temperature in the box 1 reaches the threshold value, the control device 5 controls the second driving device 412c to drive the second ejector rod 412b to move to the second piercing position to pierce the second seal 412a, and the nozzle 411 is communicated with the circulating cooling pipe 21, so that the coolant after being pressurized in the circulating cooling pipe 21 can be quickly ejected from the nozzle 411 to cool down the battery module 11.

[0052] Generally, as the temperature in the box 1 rises, the pressure in the box 1 will also rise accordingly. Therefore, in an embodiment of the present invention, the pressure boosting mechanism 3 further includes a pressure detector 34. The pressure detector 34 is communicatively connected to the control device 5. When the pressure detector 34 detects that the pressure in the box 1 reaches the threshold value, the control device 5 controls the first driving device 323 to drive the first ejector rod 322 to move to the first piercing position and controls the booster pump 312 to be turned on. The booster pump 312 boosts the gas in the gas tank 311 and outputs it into the circulating cooling pipe 21.

[0053] It should be noted that the pressure threshold value inside the box body 1 is a preset pressure value, which is obtained through research and calculation. Since the actual working conditions are different, it is not limited here. It can be understood that when either the temperature or the pressure inside the box body 1 rises to the set threshold value, the control device 5 will receive signals from the first temperature detector 33 or the pressure detector 34, and control the booster mechanism 3 to start, and pressurize the circulating cooling pipe 21.

[0054] Furthermore, the second ejector rod 412b is provided with a stop portion 412d, which is arranged at the connection between the circulating cooling pipe 21 and the nozzle assembly 41, so as to provide a resistance in the direction of the circulating cooling pipe 21 to fix the second ejector rod 412b. When the pressure inside the circulating cooling pipe 21 increases, and the thrust of the circulating cooling pipe 21 on the second ejector rod 412b towards the second seal 412a is greater than the resistance, the second ejector rod 412b overcomes the resistance and moves to the second puncture position. In the technical solution of the present invention, the booster mechanism 3 can be triggered to start by detecting two physical parameters, namely the temperature and the pressure inside the box body 1. There is a situation where the pressure reaches the threshold value but the temperature does not reach the threshold value. At this time, the pressure detector 34 sends a signal to the control device 5, and the control device 5 turns on the booster mechanism 3 to pressurize the circulating cooling pipe 21. However, the second temperature detector 42 does not detect that the temperature reaches the threshold value, and the nozzle assembly 41 will not automatically open. But as the pressure inside the circulating cooling pipe 21 increases, the thrust on the stop portion 412d of the second ejector rod 412b increases. When the thrust is greater than the resistance, the second ejector rod 412b can also move to the second puncture position to puncture the second seal 412a, so that the nozzle 411 is communicated with the circulating cooling pipe 21.

[0055] It should be noted that, in one embodiment, the stop portion 412d is provided with a through hole, and the coolant can reach the nozzle 411 through the through hole and be ejected. In another embodiment, the second ejector rod 412b can be pushed out of the nozzle 411 by the coolant, so that the coolant can be directly ejected from the nozzle 411.

[0056] In one embodiment of the present invention, the circulating cooling pipe 21 includes an inlet pipe 211 and an outlet pipe 212, which are respectively installed on both sides of the battery module 11. The temperature control device 2 further includes a liquid cooling plate 22, which is connected between the inlet pipe 211 and the outlet pipe 212. The liquid cooling plate 22 is fixedly arranged below the battery module 11 and abuts against the battery module 11. The coolant flows into the liquid cooling plate 22 from the inlet pipe 211 and flows out from the outlet pipe 212. The liquid cooling plate 22 exchanges heat with the battery module 11 to adjust the temperature of the battery module 11.

[0057] Furthermore, the number of the boosting mechanisms 3 is one or more, and the number of the nozzle mechanisms 4 is one or more. The numbers of both are not limited herein and are set according to the capacity of the box body 1 and the size of the battery module 11. The larger the box body 1 is, the larger the temperature control module is, and the more the number of the boosting mechanisms 3 is required or the larger the type selection of the boosting mechanisms 3 is. The more the number of the battery modules 11 is, the more the number of the nozzle assemblies 41 is required or the larger the type selection is.

[0058] When the number of the boosting mechanisms 3 is one, the boosting mechanism 3 is installed on the liquid inlet pipe 211 or the liquid outlet pipe 212. To ensure sufficient pressure in the circulating cooling pipe 21 where the nozzle mechanism 4 is located, one or more nozzle mechanisms 4 are installed corresponding to the boosting mechanism 3 on the liquid inlet pipe 211 or the liquid outlet pipe 212. When the number of the boosting mechanisms 3 is multiple, multiple boosting mechanisms 3 are all installed on the liquid inlet pipe 211 or the liquid outlet pipe 212. To ensure sufficient pressure in the circulating cooling pipe 21 where the nozzle mechanism 4 is located, one or more nozzle mechanisms 4 are installed corresponding to the boosting mechanisms 3 on the liquid inlet pipe 211 or the liquid outlet pipe 212. When the number of the boosting mechanisms 3 is multiple, multiple boosting mechanisms 3 are respectively installed on the liquid inlet pipe 211 and the liquid outlet pipe 212. At this time, one or more nozzle mechanisms 4 can be installed corresponding to the boosting mechanisms 3 on the liquid inlet pipe 211 and the liquid outlet pipe 212 according to requirements and corresponding pressures.

[0059] In the technical solution of the present invention, the control device 5 is a battery pack management system. The battery pack management system can actively control the actions of the boosting component 31, the first driving device 323, and the second driving device 412c. When the temperature and pressure do not reach the thresholds, it can also control the boosting component 31 to turn on, as well as the first sealing component 32 and the second sealing component 412 to turn on. Meanwhile, the action states of the corresponding components will also be transmitted to the battery pack management system.

[0060] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention. Any equivalent structural transformation made under the inventive concept of the present invention by using the content of the specification and drawings of the present invention, or any direct / indirect application in other related technical fields is included in the patent protection scope of the present invention.

Claims

1. A battery pack auxiliary cooling mechanism, characterized in that, Comprising: A box body, in which a battery module is provided; A temperature control device, fixedly installed in the box body, the temperature control device includes a circulating cooling pipe arranged on one side of the battery module, and a coolant is passed through the circulating cooling pipe; A boosting mechanism, including a boosting component and a first temperature detector, the boosting component is installed on the circulating cooling pipe and is used to pressurize the circulating cooling pipe; A nozzle mechanism, including a nozzle component and a second temperature detector, the nozzle component is fixedly installed on the circulating cooling pipe and is arranged corresponding to the battery module, and is used to spray the coolant onto the battery module; And, A control device, communicatively connected to the first temperature detector and the second temperature detector, and electrically connected to the boosting component and the nozzle component; Wherein, the boosting component and the nozzle component are in a normally closed state. When the first temperature detector detects that the temperature in the box body reaches the threshold, the control device controls the boosting component to open, and the boosting component pressurizes the circulating cooling pipe; when the second temperature detector detects that the temperature in the box body reaches the threshold, the control device controls the nozzle component to open, and the nozzle component sprays the coolant onto the battery module; The boosting component includes a booster pump and an air tank, the output end of the booster pump is connected to the circulating cooling pipe, and the input end of the booster pump is connected to the air tank, and is used to boost the gas in the air tank and output it into the circulating cooling pipe; The boosting mechanism further includes a first sealing component, installed between the booster pump and the circulating cooling pipe, and the first sealing component includes: A first seal, fixedly installed between the output end of the booster pump and the circulating cooling pipe, and is used to block the connection between the boosting component and the circulating cooling pipe; A first ejector rod, movably installed on one side of the first seal, and the first ejector rod has a first piercing position for piercing the first seal during its moving stroke; and, A first driving device, connected to the first ejector rod to drive the first ejector rod; The control device is electrically connected to the first driving device and the booster pump respectively. When the first temperature detector detects that the temperature in the box body reaches the threshold, the control device controls the first driving device to drive the first ejector rod to move to the first piercing position, and controls the booster pump to open, and the booster pump boosts the gas in the air tank and outputs it into the circulating cooling pipe.

2. The battery pack auxiliary cooling mechanism according to claim 1, wherein, The boosting mechanism further includes a pressure detector, the pressure detector is communicatively connected to the control device. When the pressure detector detects that the pressure in the box body reaches the threshold, the control device controls the first driving device to drive the first ejector rod to move to the first piercing position, and controls the booster pump to open, and the booster pump boosts the gas in the air tank and outputs it into the circulating cooling pipe.

3. The battery pack auxiliary cooling mechanism according to claim 2, wherein The nozzle component includes a nozzle and a second sealing component, the second sealing component is arranged between the nozzle and the circulating cooling pipe, and the second sealing component includes: A second seal, fixedly installed between the nozzle and the circulating cooling pipe, for blocking the connection between the nozzle and the circulating cooling pipe; A second ejector rod, movably arranged on the side of the second seal facing the circulating cooling pipe, having a second puncture position for puncturing the second seal in its moving stroke; and, A second driving device, connected to the second ejector rod for driving the second ejector rod to move.

4. The battery pack auxiliary cooling mechanism according to claim 3, wherein, The second driving device is electrically connected to the control device. When the second temperature detector detects that the temperature in the box reaches the threshold, the control device controls the second driving device to drive the second ejector rod to move to the second puncture position; Wherein, the second ejector rod is provided with a stop portion, arranged at the connection between the circulating cooling pipe and the nozzle assembly, for providing a resistance in the direction of the circulating cooling pipe to fix the second ejector rod. When the pressure in the circulating cooling pipe increases, such that the thrust of the circulating cooling pipe on the second ejector rod towards the second seal is greater than the resistance, the second ejector rod overcomes the resistance and moves to the second puncture position.

5. The battery pack auxiliary cooling mechanism according to any one of claims 1-4, characterized in that The circulating cooling pipe includes an inlet pipe and an outlet pipe, respectively installed on both sides of the battery module. The temperature control device further includes a liquid cooling plate, connected between the inlet pipe and the outlet pipe. The liquid cooling plate is fixedly arranged below the battery module and abuts against the battery module, for adjusting the temperature of the battery module.

6. The battery pack auxiliary cooling mechanism according to claim 5, wherein The number of the boosting mechanisms is one or more, and the number of the nozzle mechanisms is one or more.

7. The battery pack auxiliary cooling mechanism according to claim 6, wherein The number of the boosting mechanisms is one, and the boosting mechanism is installed on the inlet pipe or the outlet pipe. One or more nozzle mechanisms are installed on the inlet pipe or the outlet pipe corresponding to the boosting mechanism; or, The number of the boosting mechanisms is multiple, and multiple boosting mechanisms are all installed on the inlet pipe or the outlet pipe. One or more nozzle mechanisms are all installed on the inlet pipe or the outlet pipe corresponding to the boosting mechanism; or, The number of the boosting mechanisms is multiple, and multiple boosting mechanisms are respectively installed on the inlet pipe and the outlet pipe. Multiple nozzle mechanisms are respectively installed on the inlet pipe and the outlet pipe corresponding to the boosting mechanism.

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