Cooling device and cooling method based on lithium battery

Abstract

The invention relates to the technical field of lithium batteries, and provides a cooling device and a cooling method based on a lithium battery, a battery shell, a power storage module, an air cooling assembly and a partition assembly, the battery shell comprises a shell and a shell cover, and a plurality of temperature detectors are arranged on the shell cover; the power storage module comprises a plurality of battery units and a power-off switch which are arranged in the shell; the air cooling assembly comprises a first gas driver and a second gas driver; the partition assembly is arranged in the shell and comprises a gas transmission source, a plurality of annular isolation bags and a gas filter, the isolation bags and the battery units are arranged in a one-to-one correspondence mode, and the isolation bags are arranged outside the battery units in a sleeving mode; each isolation bag is communicated with a gas conveying pipe and a gas discharging pipe, the gas conveying pipe is communicated with a gas conveying source, an on-off valve is arranged on the gas conveying pipe, the gas discharging pipe is communicated with a gas filter, and a flow control piece is further arranged on the gas discharging pipe. According to the invention, thermal runaway propagation caused by a fault of a single battery unit in the lithium battery power storage module can be solved.

Description

Technical Field

[0001] This application relates to the technical field of lithium batteries, and particularly to a cooling device and method based on lithium batteries. Background Art

[0002] With the rapid development of renewable energy such as solar and wind energy, energy storage devices play an increasingly important role in energy management. Due to its advantages such as high energy density, long life, and no memory effect, lithium batteries have become one of the preferred battery types in energy storage devices. However, lithium batteries are very sensitive to temperature, and their performance will significantly decline in the case of overheating or overcooling, and even safety problems may be triggered. Therefore, designing an effective cooling device is crucial for maintaining the operating temperature of the lithium battery energy storage module within an appropriate range.

[0003] The cooling device of the lithium battery energy storage module usually consists of a cooling medium, a cooling channel, a heat exchanger, a temperature sensor, and a control device. The cooling medium can be a liquid, air, or other phase change materials. The cooling channel is located between battery cells or around the module to guide the flow of the cooling medium. The heat exchanger is used to remove heat from the cooling medium, usually by a fan or a pump to dissipate the heat to the external environment. The temperature sensor is used to monitor the temperature at each key position to ensure that the device operates within a safe temperature range. The control device automatically adjusts the operation of the cooling device according to the data of the temperature sensor, such as changing the coolant flow rate, fan speed, etc.

[0004] When a battery cell fails and overheats in the lithium battery energy storage module, the heat may quickly transfer to adjacent cells, resulting in a chain reaction and triggering nearby batteries to enter a thermal runaway state. Summary of the Invention

[0005] In order to solve the thermal runaway propagation caused by the failure of a single battery cell in the lithium battery energy storage module, which damages other battery cells, this application provides a cooling device and method based on lithium batteries.

[0006] On the one hand, this application provides a cooling device based on lithium batteries, adopting the following technical solutions: It includes a housing and a housing cover. One end of the housing is open, an air inlet is provided on one side of the housing, and an air outlet is provided on the other side. Both the air inlet and the air outlet can be opened and closed. The housing cover is detachably connected to the opening of the housing, and a plurality of temperature detectors are further provided on the side of the housing cover close to the housing; An energy storage module, including a plurality of battery cells and power-off switches arranged in the housing. The battery cells and the power-off switches are arranged in one-to-one correspondence, and the power-off switches are electrically connected to the battery cells. The temperature detectors are also arranged opposite to the battery cells one by one; The air-cooling component includes a first gas driver and a second gas driver. The first gas driver is arranged at the air inlet and is used to drive the outside gas to move into the housing. The second gas driver is arranged at the air outlet and is used to drive the gas in the housing to move outside the housing. The partition component is arranged in the housing and includes a gas supply source, a plurality of annular isolation bags, and a gas filter. The isolation bags are arranged in one-to-one correspondence with the battery units, and each isolation bag is sleeved outside the corresponding battery unit. Each isolation bag is communicated with an air inlet pipe and an exhaust pipe. The air inlet pipe is communicated with the gas supply source, and a on-off valve is arranged on the air inlet pipe. The exhaust pipe is communicated with the gas filter, and a flow control member is also arranged on the exhaust pipe.

[0007] By adopting the above technical solutions, the temperature detector is installed on the side of the housing cover close to the housing and corresponds to each battery unit to monitor the temperature change of each battery unit in real time and detect abnormal conditions in time. The power-off switch is arranged corresponding to each battery unit and is connected by telecommunication. Once it is detected by the temperature detector that a certain battery unit has overheated, the corresponding power-off switch will immediately cut off the connection of the faulty battery unit in the energy storage module to avoid further heating and affecting other battery units. The first gas driver and the second gas driver are respectively arranged at the air inlet and the air outlet to form forced convection, improve the heat dissipation efficiency, and maintain a good ventilation environment in the battery module. The isolation bags in the partition component are sleeved outside each battery unit. When a certain battery unit fails, the corresponding isolation bag can be quickly inflated by controlling the gas supply source and the on-off valve to isolate the heat transfer path and reduce the heat diffusion range, thereby protecting other normally working battery units from damage. After the battery unit fails, harmful gases such as electrolyte vapor and carbon monoxide will be discharged. Before the gas supply source is started, the air inlet and the air outlet are first closed, so that the gas supply source transports the harmful gases into the isolation bag. The harmful gases (such as electrolyte vapor and carbon monoxide) in the isolation bag can be sent into the gas filter through the exhaust pipe for purification and then discharged into the external environment, reducing the impact on the surrounding air quality and improving the safety of the device. By controlling the transportation rate of the gas supply source and the flow control member on the exhaust pipe to control the intake and exhaust amounts of the isolation bag, the isolation bag can maintain an inflated state while exhausting.

[0008] Optionally, the gas supply source is further communicated with a plurality of air inlet pipes, and the air inlet pipes are arranged in one-to-one correspondence with the isolation bags. The end of the air inlet pipe far away from the gas supply source passes through the isolation bag and is located inside the isolation bag, and the contact part between the air inlet pipe and the isolation bag is hermetically connected. The gas supply source is used to drive the gas to flow into the air inlet pipe along the air inlet pipe, and a throttling valve is also arranged on the air inlet pipe. When the isolation bladder is not inflated, the air inlet pipe is in communication with the interior of the housing; when the isolation bladder is inflated, the corresponding battery unit is isolated, and the air inlet pipe is in communication with the isolation area surrounded by the corresponding isolation bladder.

[0009] By adopting the above technical solution, the gas supply source is connected to multiple air inlet pipes, each air inlet pipe is correspondingly arranged with an isolation bladder, and passes through the isolation bladder and is located inside it. In this way, the gas in the housing and the harmful gas inside the inflated isolation bladder can enter the interior of the isolation bladder under the action of the gas supply source, ensuring the effective absorption of harmful gases. The shut-off valve on the air inlet pipe can control the on-off between the air inlet pipe and the gas supply source; after the harmful gas generated around the faulty battery unit is completely absorbed, the shut-off valve can be closed, and the air extraction of the area surrounded by the inflated isolation bladder is no longer carried out.

[0010] Optionally, ventilation tubes are provided at both the air inlet and the air outlet. One end of the ventilation tube is provided with an air passing opening, and a closing plate for opening and closing the air passing opening is rotatably arranged on one side of the air passing opening. A gas component detector is further provided in the housing, and the gas component detector is used to detect the exhaust situation after the battery unit fails.

[0011] By adopting the above technical solution, the gas component detector monitors the exhaust situation after the battery unit fails in real time, and timely discovers the harmful gas components; according to the information detected by the gas component detector, the closing plate is moved in time to control the opening and closing of the air inlet and the air outlet. It is quickly opened when ventilation is required to ensure the smooth flow of the cooling gas; after the harmful gas components are discovered, the air inlet and the air outlet are quickly closed to prevent the harmful gas from overflowing and polluting the environment.

[0012] Optionally, the first gas driver includes a first fan. The first fan includes a rotating shaft, and the rotating shaft is connected to the closing plate on one side of the air inlet to drive the closing plate to rotate. The second gas driver includes a second fan. The second fan also includes a rotating shaft, and the rotating shaft is connected to the closing plate on one side of the air outlet to drive the closing plate to rotate. The gas component detector is in telecommunication connection with the first fan and the second fan.

[0013] By adopting the above technical solutions, the first fan and the second fan are respectively installed at the air inlet and the air outlet. Through the rotating shaft and the connection between the rotating shaft and the closing plate, the air passing opening can be automatically opened or closed as needed, so as to accurately regulate the air inflow and outflow, ensure smooth gas circulation in the housing, and improve the heat dissipation efficiency. The gas component detector monitors the exhaust situation after the battery unit fails in real time, and feeds the data back to the first fan and the second fan, and timely opens and closes the air inlet and the air outlet by controlling the operating states of the first fan and the second fan.

[0014] Optionally, a middle air guiding plate group is further arranged in the housing. The middle air guiding plate group is located between the first gas driver and the second gas driver, and includes a plurality of air guiding plates arranged at intervals, and the air guiding plates are inclined.

[0015] By adopting the above technical solutions, the plurality of air guiding plates arranged at intervals and inclined can guide the air flow to be more evenly distributed among the battery units, thereby improving the cooling efficiency and cooling uniformity; and helping to prevent the occurrence of local overheating phenomena.

[0016] Optionally, a plurality of groups of guide rod groups are further fixed in the housing. The guide rod groups are arranged in one-to-one correspondence with the isolation bladder bags; each guide rod group includes a plurality of guide rods arranged circumferentially around the isolation bladder bag.

[0017] By adopting the above technical solutions, the guide rod groups can effectively support the isolation bladder bags, preventing them from deforming or displacing due to internal pressure changes. At the same time, the design of the guide rods makes the isolation bladder bags more stable during the inflation and deflation processes, ensuring the isolation effect between each battery unit, thereby improving the safety and reliability of the entire device.

[0018] Optionally, a plurality of mating groove bodies are further fixed on the housing cover. The mating groove bodies are arranged in one-to-one correspondence with the isolation bladder bags, and the mating groove bodies are for the isolation bladder bags to be snap-fitted.

[0019] By adopting the above technical solutions, the mating groove bodies on the housing cover are arranged in one-to-one correspondence with the isolation bladder bags and are for the isolation bladder bags to be snap-fitted. On the one hand, it enables the isolation bladder bags to be more stably fixed in the designated positions, avoiding displacement due to vibration or external impact; on the other hand, it improves the isolation effect after the isolation bladder bags expand, and improves the reliability and safety of the entire cooling device.

[0020] Optionally, a plurality of heat exchange housings are further fixed on the inner bottom wall of the housing. The heat exchange housings are arranged in one-to-one correspondence with the battery units. The heat exchange housings are located inside the isolation bladder bags and below the battery units, and the heat exchange housings are filled with a coolant.

[0021] By adopting the above technical solution, the coolant in the heat exchange housing can effectively absorb the heat generated by the battery unit and further improve the heat dissipation efficiency through the synergistic effect with the isolation bladder.

[0022] Optionally, a filter screen is also covered at the air vent.

[0023] By adopting the above technical solution, the filter screen can effectively block the entry of external dust and other impurities into the housing, avoiding the pollution or damage of these impurities to the internal components, thereby prolonging the service life of the cooling device and maintaining its stable operation. At the same time, the filter screen can also prevent foreign objects from being sucked into the air-cooling component, reducing the reduction of heat dissipation efficiency caused by blockage, and further improving the reliability and safety of the device.

[0024] On the other hand, the present application provides a cooling method, using the above-mentioned cooling device based on lithium batteries to cool the lithium batteries.

[0025] By adopting the above technical solution, the safety and stability of the lithium battery power storage module can be effectively improved.

[0026] In summary, the present application includes at least one of the following beneficial effects: 1. In the present application, by setting multiple temperature detectors and power-off switches, when a certain battery unit overheats, the corresponding power-off switch will immediately cut off the connection of the faulty battery unit in the power storage module, avoiding further heating and affecting other battery units; 2. In the present application, the first gas driver and the second gas driver of the air-cooling component are respectively arranged at the air inlet and the air outlet, which can effectively guide the outside cool air to flow into the housing and discharge the heated air, realizing rapid cooling; 3. In the present application, an isolation bladder is provided outside each battery unit, and a physical isolation layer can be formed through inflation and deflation operations when needed, further reducing heat transfer and improving safety; 4. In the present application, the gas filter can effectively filter the harmful gases discharged, such as electrolyte vapor and carbon monoxide, reducing environmental pollution and ensuring the safety of operators. Description of the Drawings

[0027] Figure 1 is an exploded structural schematic diagram of the cooling device based on lithium batteries in Embodiment 1 of the present application; Figure 2 is a partial exploded structural schematic diagram of the cooling device based on lithium batteries in Embodiment 1 of the present application; Figure 3 is a structural schematic diagram of the housing cover in Embodiment 1 of the present application; Figure 4 is a top view structural schematic diagram of the housing in Embodiment 1 of the present application; Figure 5 It is a schematic structural diagram of the battery unit in Embodiment 1 of the present application; Explanation of reference numerals: 1, battery housing; 11, housing; 111, air inlet; 112, air outlet; 113, installation storage box; 12, housing cover; 13, ventilation tube; 131, air passing opening; 132, closing plate; 133, filter net; 14, fitting groove body; 15, clamping edge; 2, temperature detector; 3, power storage module; 31, battery unit; 32, power-off switch; 4, air-cooling assembly; 41, first fan; 42, second fan; 5, partition assembly; 51, air supply source; 52, isolation bladder; 521, air delivery pipe; 522, exhaust pipe; 53, gas filter; 54, on-off valve; 55, flow control member; 56, intake pipe; 57, throttle valve; 6, gas component detector; 7, air guide plate; 8, guide rod; 9, heat exchange housing. Detailed implementation manners

[0028] The following will Figures 1-5 make a further detailed description of the present application.

[0029] Embodiment 1: The cooling device based on a lithium battery provided in the embodiment of the present application includes a battery housing 1, a power storage module 3, an air-cooling assembly 4, and a partition assembly 5. The battery housing 1 includes a housing 11 and a housing cover 12. The housing 11 is rectangular, and one end of the housing 11 is open. An annular clamping edge 15 is integrally formed on the side wall of the housing cover 12 close to the housing 11. The housing cover 12 is clamped at the opening of the housing 11 through the clamping edge 15. After the housing cover 12 is clamped, the connection between the housing 11 and the housing 11 can be further strengthened by bolts. A plurality of air inlets 111 are provided on one side of the housing 11, and a plurality of air outlets 112 are provided on the other side. In this embodiment, two air inlets 111 and two air outlets 112 are provided, and the air inlets 111 and the air outlets 112 are arranged in one-to-one correspondence. The air-cooling assembly 4 includes a first gas driver and a second gas driver. A first gas driver is provided at each air inlet 111, and a second gas driver is provided at each air outlet 112. In this embodiment, the first gas driver is specifically a first fan 41, and the second gas driver is specifically a second fan 42. Both the first fan 41 and the second fan 42 are centrifugal fans, which have relatively high air pressure and flow rate. One end of the first fan 41 is fixed at the air inlet 111 through a bracket, and the first fan 41 sucks in the external low-temperature air through high-speed rotation and sends it into the housing 11. One end of the second fan 42 is fixed at the air outlet 112 through a bracket, and the second fan 42 also discharges the hot air in the housing 11 through high-speed rotation.

[0030] Referring to Figure 1 and Figure 2, ventilation ducts 13 are provided at each air inlet 111 and air outlet 112. One end of the ventilation duct 13 is fixed to the outer side wall of the housing 11; the ventilation duct 13 at the air inlet 111 is sleeved outside the first fan 41, and the air inlet duct at the air outlet 112 is sleeved outside the second fan 42. An air passing opening 131 is provided at the end of the ventilation duct 13 far from the housing 11, and a filter screen 133 is covered at each air passing opening 131. The filter screen 133 is fixed to the inner side wall of the air passing opening 131; the setting of the filter screen 133 can effectively intercept dust and particulate matter and prevent them from entering the housing 11 and affecting the cooling effect. A closing plate 132 is provided on one side of the air passing opening 131, and the closing plate 132 is located inside the ventilation duct 13; the first fan 41 includes a rotating shaft that extends towards the corresponding closing plate 132 and is fixedly connected to the closing plate 132; the second fan 42 includes a rotating shaft that extends towards the corresponding closing plate 132 and is fixedly connected to the closing plate 132, realizing the rotation of the closing plate 132 inside the ventilation duct 13. Starting the first motor and the second motor can drive the closing plate 132 to rotate to open or close the air passing opening 131, thereby realizing the opening and closing of the air inlet 111 and the air outlet 112.

[0031] Refer to Figure 1 and Figure 3 , the housing cover 12 is connected to the opening of the housing 11, and a plurality of temperature detectors 2 are further provided on the side of the housing cover 12 close to the housing 11. The temperature detector 2 specifically uses a temperature sensor. The first fan 41 and the second fan 42 are electrically connected to the temperature sensor, and the rotation speeds of the first fan 41 and the second fan 42 can be dynamically adjusted according to the information fed back by the temperature sensor to achieve the best cooling effect.

[0032] Refer to Figure 1 , the power storage module 3 includes a plurality of battery units 31 and power-off switches 32 located inside the housing 11. The battery units 31 and the power-off switches 32 are arranged in one-to-one correspondence, and the power-off switches 32 are electrically connected to the battery units 31; in this embodiment, four battery units 31 are provided, and the four battery units 31 are arranged in a matrix; four temperature detectors 2 are also provided. The battery units 31 in the power storage module 3 use lithium-ion batteries, and each battery unit 31 is wrapped with a layer of graphene composite material to improve the heat dissipation efficiency. The power-off switch 32 uses an electromagnetic relay, which has a fast response speed and high reliability. The temperature detectors 2 are arranged in one-to-one correspondence with the battery units 31 to ensure that the temperature of each battery unit 31 can be accurately monitored. Each battery unit 31 is connected to its corresponding power-off switch 32 by an electric wire. When the temperature of a certain battery unit 31 exceeds the preset value, the temperature detector 2 sends a signal to control the corresponding power-off switch 32 to start, immediately cutting off the connection of the faulty battery unit 31 in the power storage module 3 to prevent heat from continuing to accumulate.

[0033] Refer toFigure 1 and Figure 4 The partition component 5 is arranged inside the housing 11 and includes an air supply source 51, an annular isolation bladder 52, and a gas filter 53. There are four isolation bladders 52 corresponding to the battery units 31, and the isolation bladders 52 are sleeved outside the battery units 31. An installation storage box 113 is integrally formed on the side wall of the housing 11, and both the air supply source 51 and the gas filter 53 are fixed in the installation storage box 113. The air supply source 51 is specifically set as an air pump, and the air supply source 51 includes an air inlet end and an air outlet end. An air delivery pipe 521 and an exhaust pipe 522 are connected to each isolation bladder 52, and each air delivery pipe 521 is connected to the air outlet end of the air supply source 51. A on-off valve 54 is installed on each air delivery pipe 521, and the on-off between the isolation bladder 52 and the air supply source 51 can be controlled through the on-off valve 54. A flow control component 55 is installed on the exhaust pipe 522. The flow control component 55 is selected as an electromagnetic valve, and the gas flow discharged from the exhaust pipe 522 can be adjusted as needed. The air inlet end of the air supply source 51 is also connected to a plurality of air inlet pipes 56. In this embodiment, there are four air inlet pipes 56, and each air inlet pipe 56 is correspondingly arranged with an isolation bladder 52. The end of the air inlet pipe 56 far from the air supply source 51 passes through the isolation bladder 52 and is located inside the isolation bladder 52. The contact part between the air inlet pipe 56 and the isolation bladder 52 is hermetically connected. A throttling valve 57 is installed on the air inlet pipe 56, and the use state of the throttling valve 57 is adjusted in an automatic manner to adapt to different working condition requirements. When the isolation bladder 52 is not inflated, the air inlet pipe 56 is connected to the inside of the housing 11; when the isolation bladder 52 is inflated, the corresponding battery unit 31 is isolated, and the air inlet pipe 56 is connected to the isolation area surrounded by the corresponding isolation bladder 52.

[0034] Referring to Figure 3 and Figure 4 The isolation bladder 52 is made of polyurethane foam material and has excellent heat insulation performance and lightweight characteristics. By arranging the isolation bladder 52 and the temperature detector 2, when a single battery unit 31 fails, the air supply source 51 can be started and the corresponding on-off valve 54 can be opened to inflate the isolation bladder 52 outside the faulty battery unit 31 to form a physical isolation barrier to prevent heat diffusion and ensure that the entire energy storage device operates within a safe working temperature range. After the isolation bladder 52 is inflated, the exhaust pipe 522 connected to the isolation bladder 52 is exhausted, and the exhaust flow is controlled through the flow control component 55, so that the isolation bladder 52 can maintain the inflated state during the exhaust process and continue to isolate the faulty battery unit 31. The exhaust pipe 522 is connected to the gas filter 53, and the gas filter 53 can effectively remove harmful components in the waste gas and then discharge the gas, reducing environmental pollution and improving the reliability and environmental protection performance of the overall device.

[0035] Referring to Figure 1 and Figure 3, a gas component detector 6 is further provided inside the housing 11. The gas component detector 6 is fixed on the housing cover 12 and is used to detect the exhaust situation after the battery unit 31 fails. The gas component detector 6 is telecommunicationally connected to the first fan 41 and the second fan 42. Once an abnormal gas concentration is detected, the first fan 41 and the second fan 42 are controlled to operate, driving the closing plate 132 to rotate, so as to quickly close the air inlet 111 and the air outlet 112 and prevent the leakage of toxic gases. Then, the first fan 41 and the second fan 42 are shut down. After exhausting through the gas filter 53 for a period of time and treating the harmful gases discharged by the faulty battery unit 31, the first fan 41 and the second fan 42 are started again to continue cooling. At this time, the gas supply source 51 still remains in the operating state to exchange heat for the faulty battery.

[0036] Refer to Figure 4 , a group of 7 middle air guide plates 7 and a group of 8 guide rods are further fixed inside the housing 11. The group of 7 middle air guide plates 7 is located between the first gas driver and the second gas driver and includes a plurality of spaced air guide plates 7, and the air guide plates 7 are inclined. In this embodiment, specifically three air guide plates 7 are provided. The group of 7 middle air guide plates 7 can make the air flow more evenly distributed inside the housing 11, reduce the generation of local hot spots, and improve the cooling efficiency. In this embodiment, the air guide plates 7 are made of stainless steel material, having good corrosion resistance and strength.

[0037] Refer to Figure 3 and Figure 4 , a group of 8 guide rods are further fixed inside the housing 11, and each group of 8 guide rods is correspondingly arranged with an isolation bladder 52. The group of 8 guide rods includes four guide rods 8 arranged circumferentially around the isolation bladder 52. The isolation bladder 52 is arranged as a rectangle, and the guide rods 8 are arranged near the top corners of the isolation bladder 52. The function of the guide rods 8 is to provide support during the inflation and deflation process of the isolation bladder 52, ensuring the morphological stability of the isolation bladder 52 during the inflation and deflation process, extending the service life, and preventing the isolation bladder 52 from deforming and affecting the isolation effect. In this embodiment, the guide rods 8 are made of carbon fiber material, being light in weight and strong in rigidity, and not interfering with the air flow. On the side of the housing cover 12 close to the housing 11, a plurality of mating groove bodies 14 are further fixed. There are four mating groove bodies 14 corresponding to the isolation bladder 52, and the mating groove bodies 14 are arranged in one-to-one correspondence with the isolation bladder 52; when the isolation bladder 52 is fully inflated and rises, the isolation bladder 52 is snapped into the mating groove bodies 14. The temperature detector 2 is located inside the mating groove bodies 14.

[0038] Refer to Figure 1 and Figure 5, a plurality of heat exchange housings 9 are fixed on the inner bottom wall of the housing 11. Each heat exchange housing 9 is correspondingly arranged with a battery unit 31, located inside the isolation bladder 52 and below the battery unit 31. The heat exchange housing 9 is filled with a coolant, such as water or ethylene glycol solution, to help the battery unit 31 dissipate heat by means of heat conduction. In this embodiment, the heat exchange housing 9 is made of copper alloy material, having excellent thermal conductivity and corrosion resistance.

[0039] The implementation principle of a cooling device based on lithium batteries in this embodiment is as follows: Turn on the first gas driver and the second gas driver, so that the outside gas enters the housing 11 through the air inlet 111 and then discharges from the housing 11 through the air outlet 112 to form a circulating air flow for cooling. Each temperature detector 2 monitors the surface temperature of the corresponding battery unit 31 in real time. If it is detected that the temperature of a certain battery unit 31 exceeds the set threshold, the power-off switch 32 on the faulty battery power supply is activated to immediately cut off the power supply of this battery unit 31 to prevent heat from continuing to accumulate. Dynamically adjust the rotation speeds of the first gas driver and the second gas driver according to the data of the temperature detector 2 to keep the temperature inside the housing 11 within a suitable range.

[0040] If the gas component detector 6 detects that the concentration of harmful gases exceeds the standard, the air inlet 111 and the air outlet 112 can be quickly closed by controlling the first fan 41 and the second fan 42 to prevent the leakage of toxic gases. The gas supply source 51 conveys gas to the isolation bladder 52 through the air inlet pipe 56 and the gas delivery pipe 521, so that the isolation bladder 52 corresponding to the faulty battery unit 31 expands to play an isolation role. After the isolation bladder 52 expands completely, open the solenoid valve on the exhaust pipe 522 to control the exhaust volume, so that the gas in the isolation bladder 52 is discharged to the gas filter 53 through the exhaust pipe 522, and after filtering out harmful substances, it is discharged into the atmosphere. It ensures the efficient cooling of the lithium battery energy storage module 3 under normal working conditions, and can also quickly take countermeasures in case of emergencies to ensure the safety of the device.

[0041] Embodiment 2:

[0042] This embodiment provides a cooling method, using the cooling device based on lithium batteries in Embodiment 1 to cool the lithium battery.

[0043] The above are all the preferred embodiments of this application. The protection scope of this application is not limited accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of this application should be covered within the protection scope of this application.

Claims

1. A cooling device based on a lithium battery, characterized in that, Comprising: A battery housing (1), including a housing body (11) and a housing cover (12), one end of the housing body (11) is open, an air inlet (111) is provided on one side of the housing body (11), and an air outlet (112) is provided on the other side. Both the air inlet (111) and the air outlet (112) can be opened and closed; the housing cover (12) is detachably connected to the opening of the housing body (11), and a plurality of temperature detectors (2) are further provided on the side of the housing cover (12) close to the housing body (11); A power storage module (3), including a plurality of battery units (31) and a power-off switch (32) arranged in the housing body (11). The battery units (31) and the power-off switch (32) are arranged in one-to-one correspondence, and the power-off switch (32) is in telecommunication connection with the battery units (31). The temperature detectors (2) are also arranged in one-to-one correspondence with the battery units (31); An air-cooling component (4), including a first gas driver and a second gas driver. The first gas driver is arranged at the air inlet (111) for driving external gas to move into the housing body (11), and the second gas driver is arranged at the air outlet (112) for driving the gas in the housing body (11) to move out of the housing body (11); A partition component (5) is arranged in the housing body (11), including an air supply source (51), a plurality of annular isolation bags (52), and a gas filter (53). The isolation bags (52) and the battery units (31) are arranged in one-to-one correspondence, and the isolation bags (52) are sleeved outside the battery units (31); each of the isolation bags (52) is communicated with an air supply pipe (521) and an exhaust pipe (522). The air supply pipe (521) is communicated with the air supply source (51), a on-off valve (54) is arranged on the air supply pipe (521), the exhaust pipe (522) is communicated with the gas filter (53), and a flow control member (55) is further arranged on the exhaust pipe (522); The air supply source (51) is further communicated with a plurality of air inlet pipes (56). The air inlet pipes (56) and the isolation bags (52) are arranged in one-to-one correspondence; one end of the air inlet pipe (56) far from the air supply source (51) passes through the isolation bag (52) and is located inside the isolation bag (52), and the contact part between the air inlet pipe (56) and the isolation bag (52) is in sealed connection; the air supply source (51) is used for driving gas to flow into the air supply pipe (521) along the air inlet pipe (56), and a throttling valve (57) is further arranged on the air inlet pipe (56); When the isolation bag (52) is not inflated, the air inlet pipe (56) is communicated with the inside of the housing body (11); when the isolation bag (52) is inflated, the corresponding battery unit (31) is isolated, and the air inlet pipe (56) is communicated with the isolation area surrounded by the corresponding isolation bag (52).

2. The cooling device based on a lithium battery according to claim 1, characterized in that, The air inlet (111) and the air outlet (112) are both provided with ventilation ducts (13). One end of the ventilation duct (13) is provided with an air passing opening (131), and a closing plate (132) for opening and closing the air passing opening (131) is rotatably arranged on one side of the air passing opening (131). A gas component detector (6) is further arranged in the housing (11), and the gas component detector (6) is used for detecting the exhaust situation after the battery unit (31) fails.

3. The cooling device based on a lithium battery according to claim 2, characterized in that, The first gas driver includes a first fan (41). The first fan (41) includes a rotating shaft, and the rotating shaft is connected to the closing plate (132) on one side of the air inlet (111) to drive the closing plate (132) to rotate. The second gas driver includes a second fan (42). The second fan (42) also includes a rotating shaft, and the rotating shaft is connected to the closing plate (132) on one side of the air outlet (112) to drive the closing plate (132) to rotate. The gas component detector (6) is in telecommunication connection with the first fan (41) and the second fan (42).

4. The cooling device based on a lithium battery according to claim 1, characterized in that, A group of middle air guiding plates (7) is further arranged in the housing (11). The group of middle air guiding plates (7) is located between the first gas driver and the second gas driver and includes a plurality of spaced air guiding plates (7), and the air guiding plates (7) are inclined.

5. The cooling device based on a lithium battery according to claim 1, characterized in that, A plurality of groups of guiding rods (8) are further fixed in the housing (11). The groups of guiding rods (8) are arranged in one-to-one correspondence with the isolation bladder (52). The group of guiding rods (8) includes a plurality of guiding rods (8) arranged circumferentially around the isolation bladder (52).

6. The cooling device based on a lithium battery according to claim 5, characterized in that, A plurality of mating grooves (14) are further fixed on the housing cover (12). The mating grooves (14) are arranged in one-to-one correspondence with the isolation bladder (52), and the isolation bladder (52) is engaged with the mating grooves (14).

7. The cooling device based on a lithium battery according to claim 1, characterized in that, A plurality of heat exchange housings (9) are further fixed on the inner bottom wall of the housing (11). The heat exchange housings (9) are arranged in one-to-one correspondence with the battery units (31). The heat exchange housings (9) are located inside the isolation bladder (52) and below the battery units (31), and the heat exchange housings (9) are filled with a coolant.

8. The cooling device based on a lithium battery according to claim 3, characterized in that, A filter screen (133) also covers the air passing opening (131).

9. A cooling method, characterized in that, The lithium battery is cooled by using the lithium battery-based cooling device according to any one of claims 1-8.

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