A device and method for non-destructive in-situ low-temperature cold disassembly of a power battery pack

Abstract

The application discloses a kind of power battery pack lossless in-situ low-temperature cold disassembly device and method, device includes drainage mechanism, refrigeration liquid circulating mechanism and refrigeration mechanism;Drainage mechanism includes air pump, drainage pipe and waste liquid collection tank;Refrigeration liquid circulating mechanism includes refrigeration liquid tank, circulating pump, inlet pipe and outlet pipe;Refrigeration mechanism is used to the refrigeration liquid refrigeration of the inlet pipe.The beneficial effects of the present application are: by in-situ using the cooling channel of battery pack liquid cooling plate, each block of adhesive at the bottom of the battery cell can be directly and effectively frozen, the bottom plate of the battery pack is sequentially transferred to the bottom plate-adhesive-battery cell bottom by freezing cold, when the adhesive is cooled to a certain temperature, its brittleness increases greatly, and then the adhesive is cracked using a vibration platform, the battery cell can be safely and losslessly taken out from the battery pack, so that the lossless disassembly of the battery cell can be realized, the disassembly yield and disassembly efficiency of the battery cell are improved, and the high-value gradient utilization of the battery cell is provided with strong guarantee.

Description

Technical Field

[0001] This invention relates to the field of power battery disassembly technology, and in particular to a non-destructive in-situ cryogenic cold disassembly device and method for power battery packs. Background Technology

[0002] Secondary utilization, as a primary method for processing retired power batteries (e.g., Chinese invention patent application number CN202111554892.6), offers a non-destructive and efficient disassembly method that can significantly increase production capacity. The process from battery pack to cell involves sequentially draining the battery pack coolant, removing screws, removing the top cover, removing copper busbars and wires, removing the module, and separating the cell. Directly removing the module or cell from the battery pack has always been a challenge in the industry. Typically, during battery pack assembly, the cell is directly bonded to the battery pack base plate and frame using a large amount of adhesive. However, in secondary utilization, the cell needs to be disassembled from the battery pack without damage. Because the adhesive strength between the cell and the battery pack is very high, using traditional mechanical methods for forceful disassembly inevitably damages the cell. To improve the battery pack disassembly yield and enable non-destructive secondary utilization of the cell, a gentle disassembly method and device are needed. Summary of the Invention

[0003] In view of this, it is necessary to provide a non-destructive in-situ cryogenic cold disassembly device and method for power battery packs, so as to provide a gentle disassembly method and device to achieve non-destructive disassembly of battery cells.

[0004] To achieve the above objectives, the present invention provides a non-destructive in-situ cryogenic cold disassembly device for a power battery pack, comprising a draining mechanism, a refrigerant circulation mechanism, and a refrigeration mechanism.

[0005] The draining mechanism includes an air pump, a drain pipe, and a waste liquid collection tank. The outlet of the air pump is used to connect with the inlet of the liquid cooling plate pipe of the battery pack. One end of the drain pipe is used to connect with the outlet of the liquid cooling plate pipe, and the other end of the drain pipe is connected with the waste liquid collection tank.

[0006] The refrigerant circulation mechanism includes a refrigerant tank, a circulation pump, an inlet pipe, and an outlet pipe. The refrigerant tank is used to hold refrigerant. The inlet of the circulation pump is connected to the refrigerant tank, and the outlet of the circulation pump is connected to one end of the inlet pipe. The other end of the inlet pipe is used to connect to the inlet of the liquid cooling plate pipeline of the battery pack. One end of the outlet pipe is used to connect to the outlet of the liquid cooling plate pipeline, and the other end of the outlet pipe is connected to the refrigerant tank.

[0007] The refrigeration mechanism is used to refrigerate the refrigerant in the inlet pipe.

[0008] In some embodiments, the draining mechanism further includes a draining check valve, one end of which is connected to the outlet of the air pump, and the other end of which is connected to the inlet of the liquid cooling plate pipeline.

[0009] In some embodiments, the drainage mechanism further includes a drainage shut-off valve, which is disposed on the drainage pipe and used to control the opening and closing of the drainage pipe.

[0010] In some embodiments, the refrigerant circulation mechanism further includes a circulation shut-off valve and a flow meter, wherein the circulation shut-off valve is disposed on the liquid outlet pipe and the flow meter is disposed on the liquid inlet pipe.

[0011] In some embodiments, the outlet pipe is further provided with a filter.

[0012] In some embodiments, the inlet pipe is further provided with an overflow valve.

[0013] In some embodiments, a pressure gauge is also provided on the inlet pipe.

[0014] In some embodiments, the battery pack includes a first thermometer for monitoring the temperature of the battery cells. The refrigerant circulation mechanism further includes a second thermometer, a third thermometer, an electromagnetic throttle valve, and a controller. The second thermometer is connected to the inlet pipe and is used to measure the temperature of the refrigerant in the inlet pipe. The third thermometer is connected to the outlet pipe and is used to measure the temperature of the refrigerant in the outlet pipe. The electromagnetic throttle valve is disposed on the inlet pipe. The controller is electrically connected to the first thermometer, the second thermometer, the refrigeration mechanism, and the electromagnetic throttle valve.

[0015] In some embodiments, the refrigeration mechanism includes a refrigeration chamber, a compressor, a condenser, an electronic expansion valve, and an evaporator. The refrigeration chamber is made of insulation material and has a sealed refrigeration cavity. The inlet of the condenser is connected to the outlet of the compressor, the inlet of the electronic expansion valve is connected to the outlet of the condenser, the inlet of the evaporator is connected to the outlet of the electronic expansion valve, and the outlet of the evaporator is connected to the inlet of the compressor. The evaporator and a portion of the liquid inlet pipe are both located within the refrigeration cavity.

[0016] This invention also provides a non-destructive in-situ cryogenic cold disassembly method for power battery packs, applicable to the aforementioned non-destructive in-situ cryogenic cold disassembly device for power battery packs. The method includes the following steps:

[0017] S1. Turn on the air pump. The air pump injects gas into the cooling channel, causing the coolant in the cooling channel to be discharged from the drain pipe to the waste liquid collection tank. Turn off the air pump when no more coolant flows out.

[0018] S2. Connect one end of the liquid outlet pipe to the outlet of the liquid cooling plate pipe, and connect the other end of the liquid outlet pipe to the refrigerant tank.

[0019] S3. Next, the circulation pump is turned on. The refrigerant in the refrigerant tank is drawn into the inlet pipe by the circulation pump. Then, the refrigeration mechanism cools the refrigerant in the inlet pipe. The cooled refrigerant then enters the inlet of the liquid cooling plate pipe of the battery pack, and then enters the cooling channel of the battery pack to cool the adhesive between the cell and the base plate.

[0020] S4. When the adhesive is cooled to a certain temperature, its brittleness increases significantly. Then, a vibration platform is used to crack the adhesive, and the battery cell is removed from the battery pack.

[0021] Compared with the prior art, the beneficial effects of the technical solution proposed in this invention are as follows: In use, firstly, the air pump is turned on, and gas is injected into the cooling channel, so that the coolant in the cooling channel is discharged from the drain pipe to the waste liquid collection tank. When no more coolant flows out, it means that the draining work is over. Then, the air pump is turned off. After the draining work is over, one end of the outlet pipe is connected to the outlet of the liquid cooling plate pipe, and the other end of the outlet pipe is connected to the refrigerant tank. Then, the circulation pump is turned on, and the refrigerant in the refrigerant tank is drawn into the inlet pipe by the circulation pump. Then, the refrigeration mechanism cools the refrigerant in the inlet pipe. Then, the cooled refrigerant enters the inlet of the liquid cooling plate pipe of the battery pack, and then enters the cooling channel of the battery pack to freeze the adhesive between the cell and the base plate. When the adhesive is cooled to a certain temperature, its brittleness increases significantly. Then, a vibration platform is used to crack the adhesive, and the cell can be safely and undamagedly removed from the battery pack.

[0022] The technical solution provided by this invention utilizes the cooling channels of the battery pack's liquid cooling plate in situ to directly, effectively, and uniformly freeze the adhesive at the bottom of each battery cell. The cooling energy is sequentially transferred from the bottom plate of the frozen battery pack to the bottom plate, the adhesive, and then to the bottom of the battery cell. When the adhesive is cooled to a certain temperature, its brittleness increases significantly. Then, a vibration platform is used to crack the adhesive, allowing the battery cell to be safely and undamagedly removed from the battery pack. This enables non-destructive disassembly of the battery cells, greatly improving the disassembly yield and efficiency, and providing strong support for the high-value, tiered utilization of battery cells. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of an existing battery pack.

[0024] Figure 2 This is a schematic diagram of an embodiment of the non-destructive in-situ cryogenic cold dismantling device for power battery packs provided by the present invention;

[0025] In the diagram: 100-Battery pack, 110-Base plate, 120-Battery cell, 130-Adhesive, 140-Liquid cooling plate, 150-Cooling channel, 151-Liquid cooling plate pipe inlet, 152-Liquid cooling plate pipe outlet, 160-First thermometer, 200-Drainage mechanism, 210-Air pump, 220-Drainage pipe, 230-Waste liquid collection tank, 240-Drainage check valve, 250-Drainage shut-off valve, 300-Refrigerant circulation mechanism, 310 - Refrigerant tank, 320- Circulation pump, 330- Inlet pipe, 331- Flow meter, 332- Overflow valve, 333- Pressure gauge, 340- Outlet pipe, 341- Circulation shut-off valve, 342- Filter, 360- Second thermometer, 370- Electromagnetic throttle valve, 380- Third thermometer, 400- Refrigeration mechanism, 410- Refrigeration chamber, 420- Compressor, 430- Condenser, 440- Electronic expansion valve, 450- Evaporator. Detailed Implementation

[0026] Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which form part of this application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not intended to limit the scope of the present invention.

[0027] To facilitate understanding of the present invention, the structure of a conventional battery pack 100 will first be described, such as... Figure 1 As shown, the battery pack 100 includes a base plate 110 and several battery cells 120. Each battery cell 120 is fixed to one side wall of the base plate 110 by an adhesive 130. A liquid cooling plate 140 is fixed to the opposite side wall of the base plate 110, forming a cooling channel 150 between the liquid cooling plate 140 and the base plate 110. The inlet of the cooling channel 150 is called the liquid cooling plate pipe inlet 151, and the outlet of the cooling channel 150 is called the liquid cooling plate pipe outlet 152. Coolant is introduced into the cooling channel 150 to cool the battery pack 100. When disassembling the battery pack 100, due to the high bonding strength of the adhesive 130, the existing mechanical disassembly methods for removing the battery cells 120 are prone to damage, reducing the utilization value of the battery cells 120. The purpose of this invention is to provide a technical solution for the safe and undamaged removal of the battery cells 120 through low-temperature cold disassembly.

[0028] Please refer to Figure 1 and Figure 2 The present invention provides a non-destructive in-situ cryogenic cold dismantling device for a power battery pack, comprising a draining mechanism 200, a refrigerant circulation mechanism 300, and a refrigeration mechanism 400.

[0029] The draining mechanism 200 includes an air pump 210, a drain pipe 220, and a waste liquid collection tank 230. The outlet of the air pump 210 is connected to the inlet 151 of the liquid cooling plate pipe of the battery pack 100. One end of the drain pipe 220 is connected to the outlet 152 of the liquid cooling plate pipe, and the other end of the drain pipe 220 is connected to the waste liquid collection tank 230. In use, the draining mechanism 200 is the first step. The air pump 210 is turned on, and gas is injected into the cooling channel 150, so that the coolant in the cooling channel 150 is discharged from the drain pipe 220 to the waste liquid collection tank 230. When no more coolant flows out, the draining work is completed, and then the air pump 210 is turned off.

[0030] The refrigerant circulation mechanism 300 includes a refrigerant tank 310, a circulation pump 320, an inlet pipe 330, and an outlet pipe 340. The refrigerant tank 310 is used to hold refrigerant. The inlet of the circulation pump 320 is connected to the refrigerant tank 310, and the outlet of the circulation pump 320 is connected to one end of the inlet pipe 330. The other end of the inlet pipe 330 is used to connect to the inlet 151 of the liquid cooling plate pipeline of the battery pack 100. One end of the outlet pipe 340 is used to connect to the outlet 152 of the liquid cooling plate pipeline, and the other end of the outlet pipe 340 is connected to the refrigerant tank 310.

[0031] The refrigeration mechanism 400 is used to refrigerate the refrigerant in the inlet pipe 330.

[0032] In operation, first turn on the air pump 210 to inject air into the cooling channel 150, causing the coolant in the cooling channel 150 to be discharged from the drain pipe 220 to the waste liquid collection tank 230. The drainage process is complete when no more coolant flows out. Then, turn off the air pump 210. After the drainage process is complete, connect one end of the outlet pipe 340 to the outlet of the liquid cooling plate pipe and the other end of the outlet pipe 340 to the refrigerant tank 310. Next, turn on the circulation pump 320, and the refrigerant in the refrigerant tank 310 will be circulated by the circulation pump 320. The liquid is drawn into the inlet pipe 330, and then the cooling mechanism 400 cools the liquid inlet pipe 330. The cooled liquid then enters the liquid cooling plate pipe inlet of the battery pack 100, and then enters the cooling channel 150 of the battery pack 100 to freeze the adhesive 130 between the cell 120 and the base plate 110. When the adhesive 130 is cooled to a certain temperature, its brittleness increases significantly. Then, a vibration platform is used to crack the adhesive 130, and the cell 120 can be safely and undamagedly removed from the battery pack 100.

[0033] The technical solution provided by this invention utilizes the cooling channels of the battery pack liquid cooling plate in situ to directly, effectively, and uniformly freeze the adhesive at the bottom of each battery cell. The cooling energy is sequentially transferred from the bottom plate 110 of the frozen battery pack to the bottom plate, adhesive, and battery cell. When the adhesive 130 is cooled to a certain temperature, its brittleness increases significantly. Then, a vibration platform is used to crack the adhesive 130, and the battery cell 120 can be safely and undamagedly removed from the battery pack 100. This enables non-destructive disassembly of the battery cell, greatly improving the disassembly yield and efficiency, and providing a strong guarantee for the high-value cascade utilization of the battery cell.

[0034] To prevent coolant backflow from the battery pack 100 from damaging the air pump 210, please refer to... Figure 1 and Figure 2 In a preferred embodiment, the draining mechanism 200 further includes a draining one-way valve 240, one end of which is connected to the outlet of the air pump 210, and the other end of which is connected to the inlet 151 of the liquid cooling plate pipeline. The function of the draining one-way valve 240 is to prevent the coolant from flowing back and damaging the air pump 210.

[0035] For better control of the drainage process, please refer to... Figure 2 In a preferred embodiment, the drainage mechanism 200 further includes a drainage shut-off valve 250, which is disposed on the drainage pipe 220 and used to control the opening and closing of the drainage pipe 220. When drainage ends, the drainage pipe 220 is cut off.

[0036] For easier control of the cooling temperature, please refer to... Figure 1 and Figure 2 In a preferred embodiment, the battery pack 100 includes a first thermometer 160 for monitoring the temperature of the battery cells. The refrigerant circulation mechanism 300 further includes a second thermometer 360, a third thermometer 380, an electromagnetic throttle valve 370, and a controller. The second thermometer 360 is connected to the inlet pipe 330 and is used to measure the temperature of the refrigerant in the inlet pipe 330. The third thermometer 380 is connected to the outlet pipe 340 and is used to measure the temperature of the refrigerant in the outlet pipe 340. The electromagnetic throttle valve 370 is disposed on the inlet pipe 330. The controller is electrically connected to the first thermometer 160, the second thermometer 360, the refrigerant circulation mechanism 400, and the electromagnetic throttle valve 370. During use, the signals transmitted by the first thermometer 160, the second thermometer 360 and the third thermometer 380 are processed by the controller and then an instruction is sent to control the power of the refrigeration mechanism 400 and the opening degree of the electromagnetic throttle valve 370. When the temperature measured by the first thermometer 160, the second thermometer 360 and the third thermometer 380 reaches the preset temperature, the refrigeration mechanism 400 stops running and the electromagnetic throttle valve 370 closes.

[0037] For easier control of the refrigerant circulation mechanism 300, please refer to... Figure 1 and Figure 2 In a preferred embodiment, the refrigerant circulation mechanism 300 further includes a circulation shut-off valve 341 and a flow meter 331. The circulation shut-off valve 341 is disposed on the liquid outlet pipe 340, and the flow meter 331 is disposed on the liquid inlet pipe 330.

[0038] To prevent the refrigerant in refrigerant tank 310 from being contaminated by impurities, please refer to... Figure 1 and Figure 2 In a preferred embodiment, a filter 342 is also provided on the liquid outlet pipe 340.

[0039] To ensure the security of the entire system, please refer to... Figure 1 and Figure 2 In a preferred embodiment, the inlet pipe 330 is also provided with an overflow valve 332 and a pressure gauge 333. When the pressure in the circulation loop is too high, the overflow valve 332 will release pressure to ensure the safe operation of the system.

[0040] To understand the specific functions of the refrigeration mechanism 400, please refer to [the relevant documentation / reference]. Figure 1 and Figure 2 In a preferred embodiment, the refrigeration mechanism 400 includes a refrigeration chamber 410, a compressor 420, a condenser 430, an electronic expansion valve 440, and an evaporator 450. The refrigeration chamber 410 is made of insulation material and has a sealed refrigeration cavity. The inlet of the condenser 430 is connected to the outlet of the compressor 420, the inlet of the electronic expansion valve 440 is connected to the outlet of the condenser 430, the inlet of the evaporator 450 is connected to the outlet of the electronic expansion valve 440, and the outlet of the evaporator 450 is connected to the inlet of the compressor 420. The evaporator 450 and a portion of the liquid inlet pipe 330 are located within the refrigeration cavity. The electronic expansion valve 440 can automatically adjust its opening size based on the pressure and temperature of the refrigerant in the refrigeration system, achieving adaptive adjustment. The power of the compressor 420 is controlled by a controller, implementing a closed-loop control system of temperature monitoring—controller—compressor 420—temperature change. The evaporator 450 absorbs heat and converts the refrigerant into vapor, which is then compressed by the compressor 420 into a high-temperature, high-pressure gas. This gas is then transported to the condenser 430, where it forms a state of high- or medium-pressure gas or a mixture of gas and liquid. Finally, it passes through the electronic expansion valve 440 and becomes a low-temperature, low-pressure liquid, thus achieving the purpose of refrigeration. The refrigerant in the evaporator 450 evaporates and absorbs heat, which lowers the temperature inside the refrigeration chamber, thereby lowering the temperature of the refrigerant in the liquid inlet pipe 330 inside the refrigeration chamber.

[0041] When in use, the compressor 420 turns on and cools the refrigerant when the temperatures measured by the first thermometer 160, the second thermometer 360 and the third thermometer 380 exceed a certain threshold.

[0042] The non-destructive in-situ cryogenic cold dismantling device for power battery packs provided by this invention operates in two modes: a cooling mode and a heat preservation mode. In the cooling mode, the power of the compressor 420 is increased to rapidly lower the temperature of the refrigerant. During this mode, the reading of the second thermometer 360 will be lower than the reading of the third thermometer 380, and the reading of the third thermometer 380 will be lower than the reading of the first thermometer 160. These three temperature parameters are converted into electrical signals and transmitted to the controller. The control program then instructs the compressor 420 to increase its power and the electromagnetic throttle valve 370 to increase its opening degree. The heat preservation mode has two main modes: when the refrigerant temperature is lower than the set temperature, the power of the compressor 420 is reduced, and the opening diameter of the electromagnetic throttle valve 370 is decreased; when the refrigerant temperature is higher than the set temperature, the power of the compressor 420 is increased, and the opening diameter of the electromagnetic throttle valve 370 is increased.

[0043] In use, the draining mechanism 200 drains the refrigerant from the battery pack's liquid cooling plate, and then the cooling mechanism 400 and the refrigerant circulation mechanism 300 are opened sequentially. The operating temperature is set, and the first thermometer 160, second thermometer 360, and third thermometer 380 convert temperature information into electrical signals, which are transmitted to the controller. The controller then transmits the signals to the compressor 420 and the electromagnetic throttle valve 370 to achieve temperature control. Its working principle is as follows: When the monitored temperature is higher than the set temperature, the controller issues a command to increase the power of the compressor 420 to quickly cool the refrigerant, and simultaneously increases the diameter of the electromagnetic throttle valve 370 to accelerate the refrigerant flow rate; when the monitored temperature reaches the set temperature, the controller issues a command to decrease the power of the compressor 420; when the monitored temperature is lower than the set temperature, the controller issues a command to simultaneously decrease the power of the compressor 420 and decrease the diameter of the electromagnetic throttle valve 370. When the first thermometer 160 detects that the temperature of the adhesive has reached the operating temperature, the adhesive 130 is cracked by the vibration platform, and the battery cell 120 can be safely and without damage removed from the battery pack 100, thus achieving non-destructive disassembly of the battery cell. After that, the coolant circulation mechanism and the cooling mechanism are turned off, and the draining mechanism is turned on again to drain the coolant from the liquid cooling plate. The entire cold disassembly process of the battery pack is completed.

[0044] It should be noted that the temperature of the refrigerant in the refrigerant circulation mechanism 300 is monitored by the second thermometer 360 and the third thermometer 380. When the readings of the two thermometers are close, it means that the base plate has cooled down to the set temperature and the heat preservation mode is activated. When the temperature monitored by the first thermometer 160 drops to the set temperature, it means that the temperature of the adhesive has reached the condition that the battery cell can be disassembled without damage. At this time, the cooling operation can be ended.

[0045] This invention also provides a method for non-destructive in-situ cryogenic cold disassembly of a power battery pack, applicable to the aforementioned non-destructive in-situ cryogenic cold disassembly device, the steps of which include:

[0046] S1. Turn on the air pump 210. The air pump 210 injects gas into the cooling channel 150, so that the coolant in the cooling channel 150 is discharged from the drain pipe 220 to the waste liquid collection tank 230. When no more coolant flows out, turn off the air pump 210.

[0047] S2. Connect one end of the liquid outlet pipe 340 to the outlet of the liquid cooling plate pipe, and connect the other end of the liquid outlet pipe 340 to the refrigerant tank 310.

[0048] S3. Start the circulation pump 320. The refrigerant in the refrigerant tank 310 is drawn into the inlet pipe 330 by the circulation pump 320. Then the refrigeration mechanism 400 cools the refrigerant in the inlet pipe 330. Then the cooled refrigerant enters the liquid cooling plate pipe inlet of the battery pack 100 and then enters the cooling channel 150 of the battery pack 100 to freeze the adhesive 130 between the cell 120 and the base plate 110.

[0049] S4. When the adhesive 130 is cooled to a certain temperature, its brittleness increases significantly. Then, the adhesive 130 is cracked by a vibration platform, and the battery cell 120 is removed from the battery pack 100.

[0050] Explanation of easily confused terms in this invention:

[0051] Coolant: refers to the coolant contained in the battery pack;

[0052] Refrigerant: refers to the liquid flowing in the various components of the refrigerant circulation mechanism 300;

[0053] Refrigerant: refers to the liquid flowing in the pipes of the refrigeration unit 400.

[0054] The beneficial effects of the technical solution provided by this invention are as follows:

[0055] (1) By utilizing the cooling channels of the battery pack liquid cooling plate in situ, the adhesive at the bottom of each cell can be frozen directly, effectively and uniformly.

[0056] (2) This device makes full use of the internal energy converted by pump pressure to achieve the heating function and achieves the purpose of energy saving;

[0057] (3) Before the cooling process, the device drains the original coolant in the battery pack, which can reduce the introduction of impurities in the coolant and avoid coolant leakage and environmental pollution. After the cold disassembly is completed, the coolant is drained and collected, which can realize the effective recycling of the coolant and avoid coolant leakage and environmental pollution.

[0058] (4) The method and device can realize the non-destructive disassembly of the battery cell, greatly improve the disassembly yield and disassembly efficiency of the battery cell, and provide a strong guarantee for the high-value cascade utilization of the battery cell.

[0059] (5) The cold dismantling device has two systems: circulation and refrigeration. It is equipped with multiple temperature sensors and temperature control components, realizing a closed-loop operation of real-time temperature monitoring, controller and temperature control components. It has the advantages of intelligence, high efficiency and energy saving.

[0060] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A non-destructive, in-situ cryogenic cold disassembly device for power battery packs, characterized in that, Includes a draining mechanism, a refrigerant circulation mechanism, and a refrigeration mechanism; The draining mechanism includes an air pump, a drain pipe, and a waste liquid collection tank. The outlet of the air pump is used to connect with the inlet of the liquid cooling plate pipe of the battery pack. One end of the drain pipe is used to connect with the outlet of the liquid cooling plate pipe, and the other end of the drain pipe is connected with the waste liquid collection tank. The refrigerant circulation mechanism includes a refrigerant tank, a circulation pump, an inlet pipe, and an outlet pipe. The refrigerant tank is used to hold refrigerant. The inlet of the circulation pump is connected to the refrigerant tank, and the outlet of the circulation pump is connected to one end of the inlet pipe. The other end of the inlet pipe is used to connect to the inlet of the liquid cooling plate pipeline of the battery pack. One end of the outlet pipe is used to connect to the outlet of the liquid cooling plate pipeline, and the other end of the outlet pipe is connected to the refrigerant tank. The refrigeration mechanism is used to refrigerate the refrigerant in the inlet pipe.

2. The non-destructive in-situ cryogenic cold disassembly device for power battery packs according to claim 1, characterized in that, The draining mechanism also includes a draining one-way valve, one end of which is connected to the outlet of the air pump, and the other end of which is connected to the inlet of the liquid cooling plate pipeline.

3. The non-destructive in-situ cryogenic cold disassembly device for power battery packs according to claim 1, characterized in that, The drainage mechanism also includes a drainage shut-off valve, which is disposed on the drainage pipe and used to control the opening and closing of the drainage pipe.

4. The non-destructive in-situ cryogenic cold disassembly device for power battery packs according to claim 1, characterized in that, The refrigerant circulation mechanism also includes a circulation shut-off valve and a flow meter. The circulation shut-off valve is located on the outlet pipe, and the flow meter is located on the inlet pipe.

5. The non-destructive in-situ cryogenic cold disassembly device for power battery packs according to claim 1, characterized in that, A filter is also installed on the liquid outlet pipe.

6. The non-destructive in-situ cryogenic cold disassembly device for power battery packs according to claim 1, characterized in that, An overflow valve is also installed on the inlet pipe.

7. The non-destructive in-situ cryogenic cold disassembly device for power battery packs according to claim 1, characterized in that, A pressure gauge is also installed on the inlet pipe.

8. The non-destructive in-situ cryogenic cold disassembly device for power battery packs according to claim 1, characterized in that, The battery pack includes a first thermometer for monitoring the cell temperature. The refrigerant circulation mechanism further includes a second thermometer, a third thermometer, an electromagnetic throttle valve, and a controller. The second thermometer is connected to the inlet pipe and is used to measure the temperature of the refrigerant in the inlet pipe. The third thermometer is connected to the outlet pipe and is used to measure the temperature of the refrigerant in the outlet pipe. The electromagnetic throttle valve is installed on the inlet pipe. The controller is electrically connected to the first thermometer, the second thermometer, the refrigeration mechanism, and the electromagnetic throttle valve.

9. The non-destructive in-situ cryogenic cold disassembly device for power battery packs according to claim 8, characterized in that, The refrigeration mechanism includes a refrigeration chamber, a compressor, a condenser, an electronic expansion valve, and an evaporator. The refrigeration chamber is made of insulation material and has a sealed refrigeration cavity. The inlet of the condenser is connected to the outlet of the compressor, the inlet of the electronic expansion valve is connected to the outlet of the condenser, the inlet of the evaporator is connected to the outlet of the electronic expansion valve, and the outlet of the evaporator is connected to the inlet of the compressor. The evaporator and a portion of the liquid inlet pipe are both located within the refrigeration cavity.

10. A method for non-destructive in-situ cryogenic cold disassembly of a power battery pack, characterized in that, The method applicable to the non-destructive in-situ cryogenic cold disassembly device for power battery packs as described in any one of claims 1-9 includes the following steps: S1. Turn on the air pump. The air pump injects gas into the cooling channel, causing the coolant in the cooling channel to be discharged from the drain pipe to the waste liquid collection tank. Turn off the air pump when no more coolant flows out. S2. Connect one end of the liquid outlet pipe to the outlet of the liquid cooling plate pipe, and connect the other end of the liquid outlet pipe to the refrigerant tank. S3. Next, the circulation pump is turned on. The refrigerant in the refrigerant tank is drawn into the inlet pipe by the circulation pump. Then, the refrigeration mechanism cools the refrigerant in the inlet pipe. The cooled refrigerant then enters the inlet of the liquid cooling plate pipe of the battery pack, and then enters the cooling channel of the battery pack to cool the adhesive between the cell and the base plate. S4. When the adhesive is cooled to a certain temperature, its brittleness increases significantly. Then, a vibration platform is used to crack the adhesive, and the battery cell is removed from the battery pack.

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