Reverse-flow type lithium battery spray heat management method, device and equipment and storage medium

Abstract

The invention discloses a reverse-flow type lithium battery spray thermal management method, device and equipment and a storage medium, and relates to the technical field of battery thermal management, and the reverse-flow type lithium battery spray thermal management method comprises the following steps: receiving inlet air through a layered flow channel structure; the inlet air is guided to the wet channel at the tail end of the dry channel through a baffle, and a reverse flow path is formed; a nozzle is controlled to spray mist based on the reverse flow path and the battery temperature, and the inlet air is discharged through an outlet below the wet channel. Cooling or heating performance is enhanced by utilizing latent heat of phase change of evaporation or condensation, cold and heat integration is achieved, meanwhile, air at an inlet of the flow channel is pre-cooled or preheated, it is ensured that the battery is always in the optimal working temperature range, the reliability and efficiency of the system are further improved through the synergistic effect of a reverse flow path and mist spraying, and the service life of the system is prolonged. And the service life of the battery is prolonged.

Description

Technical Field

[0001] This application relates to the technical field of battery thermal management, and particularly to a countercurrent lithium battery spray thermal management method, device, equipment and storage medium. Background Art

[0002] As the core power source of electric vehicles, lithium-ion batteries are favored for their high energy density, high power density and relatively high discharge voltage. However, during the charging and discharging process, lithium-ion batteries generate a large amount of heat, and excessive temperature will seriously affect the service life and performance of the batteries. Therefore, developing a reliable battery thermal management system to ensure that the battery temperature is maintained in the ideal working range of 25 - 40°C and the temperature difference is controlled within 5°C is a key requirement for ensuring the safety and efficient operation of the batteries.

[0003] Currently, common battery thermal management methods include air cooling, liquid cooling, phase change cooling and heat pipe cooling. In recent years, wet cooling technology has gradually attracted attention due to its characteristics of absorbing heat through evaporation, simple system and economic efficiency.

[0004] However, the existing wet thermal management systems have many deficiencies. First of all, most of these systems only consider cooling the battery and do not consider heating the battery, resulting in the need to additionally introduce heating elements or other heating systems to maintain the battery temperature in cold environments. Secondly, the existing systems usually have only one flow channel and do not pre-cool or pre-heat the air at the inlet of the flow channel, which limits the cooling and heating performance of the system. In addition, the spray cooling system will increase the air humidity, and the liquid medium is in direct contact with the battery, there is a risk of battery leakage and corrosion. Therefore, how to achieve integration of cooling and heating and pre-cool or pre-heat the air at the inlet of the flow channel simultaneously has become an urgent problem to be solved.

[0005] The above content is only used to assist in understanding the technical solution of this application, and does not represent an admission that the above content is prior art. Summary of the Invention

[0006] The purpose of this application is to provide a countercurrent lithium battery spray thermal management method, device, equipment and storage medium, aiming to solve the technical problem of how to achieve integration of cooling and heating and pre-cool or pre-heat the air at the inlet of the flow channel simultaneously.

[0007] To achieve the above purpose, this application proposes a countercurrent lithium battery spray thermal management method, and the method includes:

[0008] The method is applied to a countercurrent spray thermal management system, the countercurrent spray thermal management system includes a layered flow channel structure, the layered flow channel structure includes a dry channel on the outside and a wet channel on the inside, the dry channel and the wet channel are separated by a baffle, a nozzle is installed above the wet channel, the nozzles are evenly distributed in a row, and the method includes:

[0009] Receive inlet air through the stratified flow channel structure;

[0010] Guide the inlet air to the wet channel at the end of the dry channel through the baffle to form a countercurrent path;

[0011] Control the nozzle to spray mist based on the countercurrent path and the battery temperature, and discharge the inlet air through the outlet below the wet channel.

[0012] In one embodiment, the step of controlling the nozzle to spray mist based on the countercurrent path and the battery temperature, and discharging the inlet air through the outlet below the wet channel includes:

[0013] When the countercurrent path is formed, control the nozzle to spray mist matching the temperature pattern towards the inlet of the wet channel according to the battery temperature to form a liquid film or steam;

[0014] Adjust the flow rate of the mist, the wind speed, humidity, and air pressure parameters of the inlet air according to the temperature pattern to control the evaporation intensity of the liquid film or the condensation intensity of the steam;

[0015] Discharge the inlet air through the outlet below the wet channel.

[0016] In one embodiment, the step of when the countercurrent path is formed, controlling the nozzle to spray mist matching the temperature pattern towards the inlet of the wet channel according to the battery temperature to form a liquid film or steam includes:

[0017] When the countercurrent path is formed and the battery temperature is greater than the first preset temperature threshold, generate a cooling instruction and start the cold spray mode;

[0018] Control the nozzle to spray the first liquid medium towards the wet channel according to the cold spray mode to form a liquid film on the wall of the wet channel.

[0019] In one embodiment, the step of when the countercurrent path is formed, controlling the nozzle to spray mist matching the temperature pattern towards the inlet of the wet channel according to the battery temperature to form a liquid film or steam includes:

[0020] When the countercurrent path is formed and the battery temperature is less than the second preset temperature threshold, generate a heating instruction and start the hot spray mode, where the second preset temperature threshold is less than the first preset temperature threshold;

[0021] Control the nozzle to spray the second liquid medium towards the wet channel according to the hot spray mode to form steam in the wet channel.

[0022] In one embodiment, the step of adjusting the wind speed of the inlet air according to the temperature mode includes:

[0023] When the temperature mode is the cold spray mode, increasing the wind speed of the inlet air to a first preset wind speed range;

[0024] When the temperature mode is the hot spray mode, reducing the wind speed of the inlet air to a second preset wind speed range;

[0025] Monitoring the actual wind speed in the wet channel through a wind speed sensor;

[0026] Adjusting the fan speed according to the deviation value between the actual wind speed and the first preset wind speed range or the second preset wind speed range to correct the wind speed of the inlet air.

[0027] In one embodiment, the step of adjusting the flow rate of the spray according to the temperature mode includes:

[0028] When the temperature mode is the cold spray mode, calculating a first compensation coefficient according to the difference between the battery temperature and a first preset temperature threshold, and adjusting the flow rate of the spray based on the first compensation coefficient;

[0029] When the temperature mode is the hot spray mode, calculating a second compensation coefficient according to the difference between the battery temperature and a second preset temperature threshold, and adjusting the flow rate of the spray based on the second compensation coefficient, where the second preset temperature threshold is less than the first preset temperature threshold.

[0030] In one embodiment, the step of, when the temperature mode is the cold spray mode, calculating a first compensation coefficient according to the difference between the battery temperature and a first preset temperature threshold, and adjusting the flow rate of the spray based on the first compensation coefficient includes:

[0031] When the temperature mode is the cold spray mode, calculating the difference between the battery temperature and the first preset temperature threshold;

[0032] Obtaining a first compensation coefficient according to the difference and a preset temperature value;

[0033] Performing linear correction on the flow rate of the spray according to the first compensation coefficient to obtain a target spray flow rate;

[0034] Monitoring the actual spray flow rate of the nozzle through a flow meter;

[0035] When the deviation between the actual spray flow rate and the target spray flow rate is greater than a preset flow tolerance, triggering a stepped adjustment of the solenoid valve opening until the deviation is less than the preset flow tolerance.

[0036] In addition, to achieve the above object, the present application also provides a countercurrent lithium battery spray thermal management device, which comprises:

[0037] A stratified flow channel module for receiving inlet air through a stratified flow channel structure;

[0038] A countercurrent guiding module for guiding the inlet air to a wet channel at the end of the dry channel through a baffle to form a countercurrent path;

[0039] A spray control module for controlling the nozzle to spray according to the countercurrent path and the battery temperature, and discharging the inlet air through an outlet below the wet channel.

[0040] In addition, to achieve the above object, the present application also provides a countercurrent lithium battery spray thermal management device, which comprises a memory, a processor, and a computer program stored on the memory and executable on the processor, and the computer program is configured to implement the steps of the countercurrent lithium battery spray thermal management method as described above.

[0041] In addition, to achieve the above object, the present application also provides a storage medium, which is a computer-readable storage medium, and a computer program is stored on the storage medium, and when the computer program is executed by a processor, the steps of the countercurrent lithium battery spray thermal management method as described above are implemented.

[0042] In addition, to achieve the above object, the present application also provides a computer program product, which comprises a computer program, and when the computer program is executed by a processor, the steps of the countercurrent lithium battery spray thermal management method as described above are implemented.

[0043] One or more technical solutions proposed by the present application have at least the following technical effects:

[0044] First, the countercurrent spray thermal management system receives inlet air through its stratified flow channel structure, and the inlet air enters the dry channel from the air inlet on the lower outer side. This stratified design enables the air to be initially guided and distributed after entering the system, providing a clear path for the subsequent heat exchange process. Then, the system uses a baffle to guide the inlet air to the inner wet channel at the end of the dry channel to form a countercurrent path. The countercurrent path provides sufficient pre-cooling or pre-heating conditions for the inlet air, thereby improving the heat exchange efficiency. Then, the system controls the nozzle to spray cold spray or hot spray according to the real-time temperature of the battery through sensor feedback, realizing the function of cold and heat integration. Finally, the air after heat exchange is discharged from the system through an outlet below the wet channel. This process not only ensures that the battery is always within the optimal working temperature range, but also further improves the reliability and efficiency of the system through the synergistic effect of the countercurrent path and the spray, and extends the service life of the battery. Brief Description of the Drawings

[0045] The drawings herein are incorporated into and constitute a part of this specification, showing embodiments consistent with the present application and, together with the specification, are used to explain the principles of the present application.

[0046] To more clearly illustrate the technical solutions in the embodiments of the present application or in the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0047] Figure 1 It is a schematic flow chart provided for Embodiment 1 of the countercurrent lithium - battery spray thermal management method of the present application;

[0048] Figure 2 It is a schematic three - dimensional structure diagram of the system provided for Embodiment 1 of the countercurrent lithium - battery spray thermal management method of the present application;

[0049] Figure 3 It is a front elevation view of the system provided for Embodiment 1 of the countercurrent lithium - battery spray thermal management method of the present application;

[0050] Figure 4 It is a schematic flow chart provided for Embodiment 2 of the countercurrent lithium - battery spray thermal management method of the present application;

[0051] Figure 5 It is a schematic module structure diagram of the countercurrent lithium - battery spray thermal management device in the embodiments of the present application;

[0052] Figure 6 It is a schematic device structure diagram of the hardware operating environment involved in the countercurrent lithium - battery spray thermal management method in the embodiments of the present application.

[0053] The realization of the objectives, functional features and advantages of the present application will be further described with reference to the embodiments and the accompanying drawings. Detailed Embodiments

[0054] It should be understood that the specific embodiments described herein are only used to explain the technical solutions of the present application and are not used to limit the present application.

[0055] To better understand the technical solutions of the present application, the following will be described in detail in combination with the drawings of the specification and the specific embodiments.

[0056] Lithium-ion batteries are widely used due to their high energy density and power density. However, the heat generated during the charging and discharging process needs to be maintained within the ideal range of 25 - 40°C through an effective thermal management system to ensure performance and lifespan. Common thermal management methods include air cooling, liquid cooling, phase change cooling, and heat pipe cooling. Among them, wet cooling technology has received attention due to its high efficiency and economy. However, existing wet systems have deficiencies, such as only supporting cooling without a heating function, requiring additional equipment to maintain the temperature in cold environments; the single flow channel design limits the cooling and heating efficiency; spray cooling increases air humidity and may cause battery leakage and corrosion problems.

[0057] The main solution of the embodiment of this application is: adopting a layered flow channel structure, where the inlet air enters from the outside of the dry channel and is guided to the wet channel, forming a countercurrent path to provide sufficient pre-cooling or pre-heating conditions for the inlet air and improving the heat exchange efficiency. According to the real-time temperature of the battery, the nozzle is controlled by a sensor to spray cold or hot mist to achieve the cooling and heating functions, and baffles are used to pre-cool or pre-heat the inlet air to further enhance the heat exchange effect. Finally, the air after heat exchange is discharged from the outlet below the wet channel.

[0058] It should be noted that the execution entity of the embodiment of this application can be a computing service device with data processing, network communication, and program running functions, such as a tablet computer, personal computer, mobile phone, etc., or an electronic device, a countercurrent spray thermal management system, etc. that can implement the above functions. Hereinafter, taking the countercurrent spray thermal management system as an example, this embodiment and the following embodiments will be described.

[0059] Based on this, the embodiment of this application provides a countercurrent spray thermal management method for lithium batteries, referring to Figure 1 , Figure 1 which is a schematic flow chart of the first embodiment of the countercurrent spray thermal management method for lithium batteries in this application.

[0060] In this embodiment, the countercurrent spray thermal management method for lithium batteries is applied to a countercurrent spray thermal management system. Referring to Figure 2 and Figure 3 , Figure 2 which is a three-dimensional structure schematic diagram of the system provided by the first embodiment of the countercurrent spray thermal management method for lithium batteries in this application, Figure 3 and

[0061] Step S10, receive inlet air through the stratified flow channel structure.

[0062] It should be noted that the stratified flow channel structure refers to a double-layer structure with clear partitions designed for the channels through which air flows in a counter-flow spray thermal management system. This structure divides the air flow channel into a dry channel on the outer side and a wet channel on the inner side. The two are separated by baffles, forming two independent and cooperating air flow regions. The purpose of this stratified design is to enable the air to achieve different heat exchange functions in the dry channel and the wet channel respectively when flowing through the system, thereby improving the overall thermal management performance of the system.

[0063] The nozzle is a component arranged at the center of the wet channel, evenly distributed in a row, and spraying spray into the wet channel. Its main function is to generate spray. The nozzle sprays droplets downward, and the droplets form a spray in the wet channel. The temperature of the spray can be adjusted as needed to achieve the cooling or heating function of the battery.

[0064] Inlet air refers to the air that enters the counter-flow spray thermal management system from outside the system.

[0065] It can be understood that the counter-flow spray thermal management system receives inlet air from outside through the air inlet on the outer side below it.

[0066] Step S20, guide the inlet air to the wet channel at the end of the dry channel through the baffle to form a counter-flow path.

[0067] It should be noted that the counter-flow path refers to the entire flow process in the counter-flow spray thermal management system. After the inlet air is pre-treated in the dry channel, it changes its flow direction through the guidance of the baffle, enters the wet channel from the end of the dry channel, and exchanges heat with the spray in the wet channel.

[0068] It can be understood that, first, the counter-flow spray thermal management system uses the partitioning effect of the baffle to guide the inlet air at the end of the dry channel. Second, through the structural design of the baffle, the air flow direction is reversed, turning from the end of the dry channel to the inlet of the wet channel. Finally, after the air enters the wet channel, it forms a counter-flow with the spray. The design of this counter-flow path can provide sufficient pre-cooling or pre-heating conditions for the inlet air, thereby improving the heat exchange efficiency and better realizing the cooling or heating function of the battery.

[0069] Step S30, control the nozzle to spray the spray based on the counter-flow path and the battery temperature, and discharge the inlet air through the outlet below the wet channel.

[0070] It should be noted that the battery temperature refers to the actual temperature generated by the lithium battery during the charging and discharging process. This temperature is a key parameter that the battery thermal management system needs to monitor and control because it directly relates to the performance, lifespan, and safety of the battery.

[0071] It can be understood that, first, the countercurrent spray thermal management system monitors the battery temperature in real time through sensors to obtain the current temperature status of the battery. Then, the system compares and analyzes the battery temperature with the set ideal operating temperature range (25 - 40 °C) to determine whether cooling or heating operations are required. If the battery temperature is too high, the system controls the nozzle to spray cold mist; if the battery temperature is too low, it controls the nozzle to spray hot mist. At the same time, the system utilizes the design of the countercurrent path to enable the inlet air to fully contact and exchange heat with the spray in the wet channel. While cooling or heating the battery, it also pre-cools or pre-heats the inlet air newly entering the dry channel through the heat transfer of the baffle. Finally, the air after heat exchange is discharged from the system through the outlet below the wet channel, completing the entire thermal management process, thereby achieving precise control of the battery temperature.

[0072] This embodiment provides a countercurrent lithium battery spray thermal management method. First, the countercurrent spray thermal management system receives the inlet air through its stratified flow channel structure, and the inlet air enters the dry channel from the air inlet on the lower outer side. This stratified design enables the air to be initially guided and distributed after entering the system, providing a clear path for the subsequent heat exchange process. Then, the system uses the baffle to guide the inlet air to the inner wet channel at the end of the dry channel, forming a countercurrent path. The design of this countercurrent path provides sufficient pre-cooling or pre-heating conditions for the inlet air, thereby improving the heat exchange efficiency. Then, the system controls the nozzle to spray cold mist or hot mist through sensor feedback according to the real-time temperature of the battery, realizing the function of cold and heat integration. While the spray cools or heats the battery, it also pre-cools or pre-heats the inlet air of the flow channel through the heat transfer of the baffle, improving the efficiency of the subsequent heat exchange. Finally, the air after heat exchange is discharged from the system through the outlet below the wet channel. This process not only ensures that the battery is always within the optimal operating temperature range but also further improves the reliability and efficiency of the system and extends the service life of the battery through the synergistic effect of the countercurrent path and the spray.

[0073] Based on the first embodiment of the present application, in the second embodiment of the present application, the same or similar content as that in the above-mentioned first embodiment can be referred to the above introduction and will not be repeated hereinafter. On this basis, please refer to Figure 4 , Figure 4 which is the flow schematic diagram of the second embodiment of the countercurrent lithium battery spray thermal management method of the present application. The step S30 of the countercurrent lithium battery spray thermal management method includes steps S31 to S33:

[0074] Step S31, when the countercurrent path is formed, control the nozzle to spray a mist matching the temperature mode at the inlet of the wet channel according to the battery temperature to form a liquid film or steam.

[0075] It should be noted that the temperature mode refers to the system operation mode determined according to the relationship between the current battery temperature and the ideal operating temperature range, that is, the cooling mode / cold spray mode or the heating mode / thermal spray mode. If the battery temperature is higher than the upper limit of the ideal operating temperature range, the system enters the cooling mode / cold spray mode; if the battery temperature is lower than the lower limit of the ideal operating temperature range, the system enters the heating mode / thermal spray mode.

[0076] The spray refers to the mist-like liquid composed of fine droplets ejected from the nozzle and is the key medium for realizing heat exchange. According to the different temperature modes, the spray can be a cold spray (for cooling the battery) or a thermal spray (for heating the battery). The cold spray absorbs heat through evaporation to lower the battery temperature, while the thermal spray releases heat through condensation to increase the battery temperature.

[0077] The liquid film refers to the thin layer of liquid formed by the spray on the wall of the wet channel. When the spray enters the wet channel and contacts the wall, part of the droplets will adhere to the wall to form a liquid film. The liquid film evaporates under the drive of the air flow, absorbing the heat of the wall / baffle, thereby realizing the cooling of the battery and the precooling of the inlet air.

[0078] The steam refers to the hot steam formed by the heat and mass transfer between the thermal spray and the air. In the heating mode, the thermal spray releases heat when condensing, and at the same time, the droplets generated by condensation will further transfer heat to the wall / baffle, thereby realizing the heating of the battery and the preheating of the inlet air.

[0079] It can be understood that after the countercurrent path is formed, the countercurrent spray thermal management system will monitor the battery temperature in real time and compare the actual battery temperature with the set ideal operating temperature range to determine the current required temperature mode. If the battery temperature is too high, the system enters the cooling mode and controls the nozzle to spray cold spray at the inlet of the wet channel; if the battery temperature is too low, the system enters the heating mode and controls the nozzle to spray thermal spray. After the spray ejected from the nozzle enters the wet channel, part of the droplets will adhere to the wall of the wet channel to form a liquid film under the drive of the air flow. In the cooling mode, the liquid film evaporates and absorbs heat to lower the temperature of the air and the battery in the wet channel; in the heating mode, the hot steam condenses and releases heat, and at the same time, the droplets generated by condensation transfer sensible heat to the wall to increase the temperature of the air and the battery in the wet channel. In this way, the system can realize the thermal management function of cold and heat integration and optimize the heat exchange efficiency.

[0080] As an example, when the countercurrent path is formed, the step of controlling the nozzle to spray a spray matching the temperature pattern to the inlet of the wet channel to form a liquid film or vapor according to the battery temperature includes: when the countercurrent path is formed and the battery temperature is greater than the first preset temperature threshold, generating a cooling instruction and starting the cold spray mode; controlling the nozzle to spray a first liquid medium to the wet channel according to the cold spray mode to form a liquid film on the wall surface of the wet channel.

[0081] The first preset temperature threshold refers to an upper limit value of temperature set by the system. When the battery temperature exceeds this value, the system will start the cooling mode. For example, assume that the first preset temperature threshold is set at 40 °C. When the battery temperature exceeds 40 °C, the system will determine that the battery is in an overheated state and cooling is required.

[0082] The cooling instruction is a control signal generated by the system after detecting that the battery temperature exceeds the first preset temperature threshold. This instruction is used to trigger the system to enter the cooling mode and start relevant cooling operations.

[0083] The cold spray mode refers to a specific operating state that the system enters after being triggered by the cooling instruction. In this mode, the system will control the nozzle to spray a first liquid medium to achieve the cooling of the battery. Specifically, the nozzle will spray cold spray according to preset parameters (such as flow rate, pressure, etc.), so that the spray evaporates in the wet channel and absorbs heat, thereby reducing the battery temperature.

[0084] The first liquid medium refers to the liquid sprayed by the nozzle for cooling the battery. This liquid usually has a lower temperature and can evaporate in the wet channel and absorb a large amount of heat. For example, cooled water or other liquids with high specific heat capacity and high latent heat of vaporization can be used as the first liquid medium.

[0085] First, after the system monitors that the battery temperature exceeds the first preset temperature threshold, it immediately generates a cooling instruction to trigger the start of the cold spray mode. Secondly, once the cold spray mode is started, the system will precisely control the nozzle to spray a first liquid medium to the wet channel to ensure that the liquid medium can be evenly sprayed to the inlet of the wet channel. Finally, the first liquid medium quickly forms a liquid film on the wall surface of the wet channel, absorbs heat through evaporation, thereby effectively reducing the battery temperature and achieving the cooling purpose. This process can not only quickly respond to the overheated state of the battery, but also ensure that the battery temperature quickly returns to the safe operating range through the efficient heat exchange mechanism of liquid film evaporation.

[0086] As an example, when the countercurrent path is formed, the step of controlling the nozzle to spray a spray matching the temperature pattern into the inlet of the wet channel to form a liquid film or steam according to the battery temperature includes: when the countercurrent path is formed and the battery temperature is less than a second preset temperature threshold, generating a heating instruction and starting a hot spray mode, where the second preset temperature threshold is less than the first preset temperature threshold; controlling the nozzle to spray a second liquid medium into the wet channel according to the hot spray mode to form steam in the wet channel.

[0087] The second preset temperature threshold refers to a lower limit temperature set by the system. When the battery temperature is lower than this value, the system will start the heating mode. For example, assuming the second preset temperature threshold is set at 5°C, when the battery temperature is lower than 5°C, the system will determine that the battery is in a low-temperature state and heating is required.

[0088] The heating instruction is a control signal generated by the system after detecting that the battery temperature is lower than the second preset temperature threshold. This instruction is used to trigger the system to enter the heating mode and start related heating operations.

[0089] The hot spray mode refers to a specific operating state entered by the system after being triggered by the heating instruction. In this mode, the system controls the nozzle to spray a second liquid medium to heat the battery. Specifically, the nozzle sprays a hot spray according to preset parameters (such as flow rate, pressure, etc.), causing the hot steam to condense in the wet channel and release heat, thereby increasing the battery temperature.

[0090] The second liquid medium refers to the liquid sprayed by the nozzle for heating the battery. This liquid usually has a relatively high temperature and can condense in the wet channel and release a large amount of heat. For example, heated water or other liquids with a high specific heat capacity and high condensation heat can be used as the second liquid medium.

[0091] First, when the system detects that the battery temperature is lower than the second preset temperature threshold, it automatically triggers a heating instruction to cope with the low-temperature state of the battery. The system then starts the hot spray mode. At this time, the nozzle adjusts according to preset parameters and begins to spray the second liquid medium into the wet channel. Finally, after the second liquid medium enters the wet channel, it forms steam, and the latent heat is released when the steam condenses in the channel, thereby effectively increasing the battery temperature and ensuring that the battery is within a suitable operating temperature range.

[0092] Step S32, adjusting the flow rate of the spray, the wind speed, humidity, and air pressure parameters of the inlet air according to the temperature pattern to control the evaporation intensity of the liquid film or the condensation intensity of the steam.

[0093] It should be noted that the evaporation intensity refers to the rate or degree of evaporation of the liquid film on the wet channel wall surface, which reflects the ability of the liquid film to absorb heat and convert it into steam. The higher the evaporation intensity, the more heat the liquid film absorbs, and the more significant the cooling effect.

[0094] The condensation intensity refers to the rate or degree of condensation of steam on the wet channel wall surface, which reflects the ability of steam to release heat and convert it into liquid state. The higher the condensation intensity, the more heat the steam releases, and the more significant the heating effect.

[0095] It can be understood that, first, the countercurrent spray thermal management system adjusts the spray flow rate according to the current temperature mode (cooling or heating) to ensure sufficient spray for heat exchange. Second, the system adjusts the wind speed of the inlet air, increasing the wind speed during cooling to accelerate the evaporation of the liquid film, and decreasing the wind speed during heating to extend the contact time between the steam and the wall surface, thereby enhancing the condensation effect. Then, the system adjusts the humidity of the inlet air, reducing the humidity during cooling to improve the evaporation efficiency. Finally, the system also adjusts the air pressure, reducing the air pressure during cooling to promote evaporation, and increasing the air pressure during heating to enhance condensation. Through these steps, the system can accurately control the evaporation intensity of the liquid film or the condensation intensity of the steam, thereby achieving efficient management of the battery temperature.

[0096] As an example, the step of adjusting the wind speed of the inlet air according to the temperature mode includes: when the temperature mode is the cold spray mode, increasing the wind speed of the inlet air to the first preset wind speed range; when the temperature mode is the hot spray mode, decreasing the wind speed of the inlet air to the second preset wind speed range; monitoring the actual wind speed in the wet channel through a wind speed sensor; and adjusting the fan speed according to the deviation value between the actual wind speed and the first preset wind speed range or the second preset wind speed range to correct the wind speed of the inlet air.

[0097] The first preset wind speed range refers to the target interval of the wind speed of the inlet air set by the system in the cold spray mode. This range is to ensure that during the cooling process, air can flow through the wet channel at a high enough speed to accelerate the evaporation of the liquid film and improve the cooling efficiency. For example, 5 - 8 m / s, this speed can effectively carry away the water vapor generated by evaporation and promote further evaporation of the liquid film.

[0098] The second preset wind speed range refers to the target interval of the wind speed of the inlet air set by the system in the hot spray mode. This range is to ensure that during the heating process, air can flow through the wet channel at a lower speed to extend the contact time between the steam and the wall surface, enhance the condensation effect, and improve the heating efficiency. For example, 2 - 4 m / s, this speed can allow the steam to have enough time to condense and release latent heat on the wall surface.

[0099] First, when the system determines that the current temperature mode is the cold spray mode, it will adjust the speed of the blower to the corresponding first preset wind speed range, increasing the wind speed of the inlet air. This can accelerate the evaporation rate of the liquid film in the wet channel, thereby improving the cooling efficiency. Second, when the temperature mode is switched to the hot spray mode, the system will reduce the blower speed to the second preset wind speed range, decreasing the wind speed of the inlet air, allowing the steam to have a longer residence time in the wet channel, thereby enhancing the condensation effect and improving the heating efficiency. Finally, the actual wind speed in the wet channel is monitored in real time through a wind speed sensor. If there is a deviation between the actual wind speed and the preset range, the system will further fine-tune the blower speed according to the deviation value to ensure that the wind speed of the inlet air always meets the requirements of the current temperature mode, achieving precise thermal management control.

[0100] As an example, the step of adjusting the flow rate of the spray according to the temperature mode includes: when the temperature mode is the cold spray mode, calculating a first compensation coefficient based on the difference between the battery temperature and the first preset temperature threshold, and adjusting the flow rate of the spray based on the first compensation coefficient; when the temperature mode is the hot spray mode, calculating a second compensation coefficient based on the difference between the battery temperature and the second preset temperature threshold, and adjusting the flow rate of the spray based on the second compensation coefficient, where the second preset temperature threshold is less than the first preset temperature threshold.

[0101] The first compensation coefficient refers to an adjustment factor calculated based on the difference between the battery temperature and the first preset temperature threshold in the cold spray mode. The second compensation coefficient refers to an adjustment factor calculated based on the difference between the battery temperature and the second preset temperature threshold in the hot spray mode. These two coefficients are used to quantify the degree to which the battery temperature exceeds the ideal range and adjust the spray flow rate accordingly.

[0102] First, when the system is in the cold spray mode, calculate the difference between the battery temperature and the first preset temperature threshold, and determine the first compensation coefficient based on this difference. If the difference is large, it indicates that the battery temperature is too high and a stronger cooling effect is required, and the system will increase the spray flow rate according to the first compensation coefficient. Second, when the system switches to the hot spray mode, calculate the difference between the battery temperature and the second preset temperature threshold, and obtain the second compensation coefficient. If the difference is large, it indicates that the battery temperature is too low and a stronger heating effect is required, and the system will increase the spray flow rate according to the second compensation coefficient. Finally, by adjusting the spray flow rate through this difference-based compensation coefficient, the system can precisely control the spray flow rate according to the actual deviation degree of the battery temperature, ensuring that the battery temperature always remains within the ideal working range.

[0103] As an example, when the temperature mode is the cold spray mode, the steps of calculating a first compensation coefficient according to the difference between the battery temperature and a first preset temperature threshold and adjusting the flow rate of the spray based on the first compensation coefficient include: when the temperature mode is the cold spray mode, calculating the difference between the battery temperature and the first preset temperature threshold; obtaining the first compensation coefficient according to the difference and a preset temperature value; linearly correcting the flow rate of the spray according to the first compensation coefficient to obtain a target spray flow rate; monitoring the actual spray flow rate of the nozzle through a flow meter; when the deviation between the actual spray flow rate and the target spray flow rate is greater than a preset flow tolerance, triggering a stepped adjustment of the solenoid valve opening until the deviation is less than the preset flow tolerance.

[0104] The preset temperature value refers to a reference temperature value set by the system for calculating the compensation coefficient, and the compensation coefficient is the difference divided by the preset temperature value.

[0105] The target spray flow rate refers to the spray flow rate adjusted according to the first compensation coefficient. For example, if the initial spray flow rate is 1 L / min and the first compensation coefficient is 0.2, then the target spray flow rate is 1×(1 + 0.2) = 1.2 L / min.

[0106] The preset flow tolerance refers to the maximum deviation range allowed by the system between the actual spray flow rate and the target spray flow rate. For example, ±0.1 L / min, which means that the deviation between the actual spray flow rate and the target spray flow rate cannot exceed 0.1 L / min.

[0107] The stepped adjustment means that when the deviation between the actual spray flow rate and the target spray flow rate exceeds the preset flow tolerance, the system corrects the spray flow rate by gradually adjusting the opening of the solenoid valve, and the adjustment amplitude each time is fixed until the deviation is less than the preset flow tolerance. For example, each time the solenoid valve opening can be adjusted to increase or decrease the flow rate by 0.05 L / min until the deviation between the actual flow rate and the target flow rate is less than ±0.1 L / min.

[0108] First, in the cold spray mode, the system calculates the difference between the battery temperature and the first preset temperature threshold, and this difference is used to determine the degree to which the battery temperature exceeds the ideal range. Second, the system divides the difference by the preset temperature value to obtain the first compensation coefficient, and then multiplies the initial spray flow rate by (1 + the first compensation coefficient) to calculate the target spray flow rate, so as to dynamically adjust the spray flow rate to meet the actual temperature requirements of the battery. Finally, the actual spray flow rate of the nozzle is monitored through a flow meter. If the deviation between the actual flow rate and the target flow rate is greater than the preset flow tolerance, a stepped adjustment of the solenoid valve opening is triggered, and each time a small amplitude is adjusted to gradually correct the flow rate until the deviation is less than the preset flow tolerance, ensuring precise control of the spray flow rate.

[0109] Step S33, discharge the inlet air through the outlet below the wet channel.

[0110] It can be understood that after the air in the wet channel completes heat exchange, it will flow downward along the wet channel. The air flows to the end of the wet channel and reaches the outlet position below the wet channel. Finally, the system discharges the processed air out of the system through this outlet, ensuring that the air can smoothly leave the wet channel, complete the entire cycle process, and at the same time avoid air staying or flowing back in the channel, maintaining the normal operation of the system.

[0111] In this embodiment, after the countercurrent path is formed, first, determine the current required temperature mode (cooling or heating) according to the real-time temperature of the battery, and control the nozzle to spray the corresponding temperature spray into the inlet of the wet channel. When cooling, spray cold spray to form a liquid film to absorb heat, and when heating, spray hot spray to form steam to release heat. This precise spray control can quickly respond to the temperature requirements of the battery and achieve integrated thermal management. Secondly, further adjust parameters such as the spray flow rate, the wind speed, humidity, and air pressure of the inlet air according to the temperature mode, so as to optimize the heat exchange efficiency, ensure that the battery temperature is always in the best working range, and improve the performance and service life of the battery. Finally, the air after heat exchange is discharged from the system through the outlet below the wet channel. This process not only completes the recycling of air, but also avoids the accumulation of hot air in the channel, maintains the stable operation of the system, and at the same time the discharged air can be used for other purposes or reprocessed, improving the overall energy efficiency of the system.

[0112] It should be noted that the above examples are only for understanding this application and do not constitute a limitation to the countercurrent lithium battery spray thermal management method of this application. Based on this technical concept, more forms of simple transformation are within the protection scope of this application.

[0113] This application also provides a countercurrent lithium battery spray thermal management device. Please refer to Figure 5 , the countercurrent lithium battery spray thermal management device includes:

[0114] A stratified flow channel module 10 for receiving inlet air through a stratified flow channel structure;

[0115] A countercurrent guiding module 20 for guiding the inlet air to the wet channel at the end of the dry channel through a baffle to form a countercurrent path;

[0116] A spray control module 30 for controlling the nozzle to spray spray based on the countercurrent path and the battery temperature, and discharging the inlet air through the outlet below the wet channel.

[0117] In one embodiment, the spray control module 30 is further configured to, when the countercurrent path is formed, control the nozzle to spray a spray matching the temperature pattern towards the inlet of the wet channel according to the battery temperature to form a liquid film or steam; adjust the flow rate of the spray, the wind speed, humidity, and air pressure parameters of the inlet air according to the temperature pattern to control the evaporation intensity of the liquid film or the condensation intensity of the steam; and discharge the inlet air through an outlet below the wet channel.

[0118] In one embodiment, the spray control module 30 is further configured to, when the countercurrent path is formed and the battery temperature is greater than a first preset temperature threshold, generate a cooling instruction and activate a cold spray mode; control the nozzle to spray a first liquid medium towards the wet channel according to the cold spray mode to form a liquid film on the wall surface of the wet channel.

[0119] In one embodiment, the spray control module 30 is further configured to, when the countercurrent path is formed and the battery temperature is less than a second preset temperature threshold, generate a heating instruction and activate a hot spray mode, where the second preset temperature threshold is less than the first preset temperature threshold; control the nozzle to spray a second liquid medium towards the wet channel according to the hot spray mode to form steam in the wet channel.

[0120] In one embodiment, the spray control module 30 is further configured to, when the temperature pattern is the cold spray mode, increase the wind speed of the inlet air to a first preset wind speed range; when the temperature pattern is the hot spray mode, decrease the wind speed of the inlet air to a second preset wind speed range; monitor the actual wind speed in the wet channel through a wind speed sensor; and adjust the fan speed according to the deviation value between the actual wind speed and the first preset wind speed range or the second preset wind speed range to correct the wind speed of the inlet air.

[0121] In one embodiment, the spray control module 30 is further configured to, when the temperature pattern is the cold spray mode, calculate a first compensation coefficient according to the difference between the battery temperature and the first preset temperature threshold, and adjust the flow rate of the spray based on the first compensation coefficient; when the temperature pattern is the hot spray mode, calculate a second compensation coefficient according to the difference between the battery temperature and the second preset temperature threshold, and adjust the flow rate of the spray based on the second compensation coefficient, where the second preset temperature threshold is less than the first preset temperature threshold.

[0122] In one embodiment, the spray control module 30 is further configured to calculate the difference between the battery temperature and a first preset temperature threshold when the temperature mode is the cold spray mode; obtain a first compensation coefficient according to the difference and a preset temperature value; linearly correct the flow rate of the spray according to the first compensation coefficient to obtain a target spray flow rate; monitor the actual spray flow rate of the nozzle through a flow meter; and trigger a stepped adjustment of the solenoid valve opening when the deviation between the actual spray flow rate and the target spray flow rate is greater than a preset flow tolerance until the deviation is less than the preset flow tolerance.

[0123] The countercurrent lithium battery spray thermal management device provided by the present application adopts the countercurrent lithium battery spray thermal management method in the above embodiment, and can solve the technical problem of how to achieve cold and heat integration and pre-cool or pre-heat the air at the inlet of the flow channel at the same time. Compared with the prior art, the beneficial effects of the countercurrent lithium battery spray thermal management device provided by the present application are the same as those of the countercurrent lithium battery spray thermal management method provided by the above embodiment, and other technical features in the countercurrent lithium battery spray thermal management device are the same as the features disclosed in the method of the above embodiment, and will not be elaborated here.

[0124] The present application provides a countercurrent lithium battery spray thermal management device, and the countercurrent lithium battery spray thermal management device includes: at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can execute the countercurrent lithium battery spray thermal management method in the first embodiment above.

[0125] Next, refer to Figure 6 , which shows a schematic structural diagram of a countercurrent lithium battery spray thermal management device suitable for implementing the embodiments of the present application. The countercurrent lithium battery spray thermal management device in the embodiments of the present application may include, but is not limited to, mobile terminals such as mobile phones, laptop computers, digital broadcast receivers, PDAs (Personal Digital Assistants), PADs (Portable Application Descriptions, tablet computers), PMPs (Portable Media Players), in-vehicle terminals (such as in-vehicle navigation terminals), etc., and fixed terminals such as digital TVs, desktop computers, etc. Figure 6 The countercurrent lithium battery spray thermal management device shown is only an example and should not impose any limitation on the functions and usage scope of the embodiments of the present application.

[0126] As Figure 6As shown, the countercurrent lithium battery spray thermal management device may include a processing device 1001 (such as a central processing unit, a graphics processing unit, etc.), which can perform various appropriate actions and processes according to the program stored in the ROM (Read Only Memory) 1002 or the program loaded from the storage device 1003 into the RAM (Random Access Memory) 1004. In the RAM 1004, various programs and data required for the operation of the countercurrent lithium battery spray thermal management device are also stored. The processing device 1001, the ROM 1002, and the RAM 1004 are connected to each other through a bus 1005. The input / output (I / O) interface 1006 is also connected to the bus. Generally, the following systems can be connected to the I / O interface 1006: an input device 1007 including, for example, a touch screen, a touchpad, a keyboard, a mouse, an image sensor, a microphone, an accelerometer, a gyroscope, etc.; an output device 1008 including, for example, an LCD (Liquid Crystal Display), a speaker, a vibrator, etc.; a storage device 1003 including, for example, a magnetic tape, a hard disk, etc.; and a communication device 1009. The communication device 1009 can allow the countercurrent lithium battery spray thermal management device to communicate with other devices wirelessly or wiredly to exchange data. Although the figure shows a countercurrent lithium battery spray thermal management device with various systems, it should be understood that it is not required to implement or have all the shown systems. More or fewer systems can be alternatively implemented or had.

[0127] In particular, according to the embodiments disclosed in the present application, the processes described above with reference to the flowcharts can be implemented as computer software programs. For example, the embodiments disclosed in the present application include a computer program product, which includes a computer program carried on a computer-readable medium, and the computer program contains program codes for executing the methods shown in the flowcharts. In such an embodiment, the computer program can be downloaded and installed from the network through the communication device, or installed from the storage device 1003, or installed from the ROM 1002. When the computer program is executed by the processing device 1001, the above-mentioned functions defined in the methods of the embodiments disclosed in the present application are executed.

[0128] The countercurrent lithium battery spray thermal management device provided by the present application adopts the countercurrent lithium battery spray thermal management method in the above embodiments, and can solve the technical problem of how to achieve cold and heat integration and pre-cool or pre-heat the air at the inlet of the flow channel at the same time. Compared with the prior art, the beneficial effects of the countercurrent lithium battery spray thermal management device provided by the present application are the same as those of the countercurrent lithium battery spray thermal management method provided by the above embodiments, and the other technical features in the countercurrent lithium battery spray thermal management device are the same as the features disclosed in the method of the previous embodiment, and will not be elaborated here.

[0129] It should be understood that each part disclosed in this application can be implemented by hardware, software, firmware, or a combination thereof. In the description of the above embodiments, specific features, structures, materials, or characteristics can be combined in a suitable manner in any one or more embodiments or examples.

[0130] As described above, the above are only specific embodiments of this application, but the protection scope of this application is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed in this application, and all should be covered by the protection scope of this application. Therefore, the protection scope of this application should be subject to the protection scope of the claims.

[0131] This application provides a computer-readable storage medium having computer-readable program instructions (i.e., computer programs) stored thereon, and the computer-readable program instructions are used to execute the countercurrent lithium battery spray thermal management method in the above embodiments.

[0132] The computer-readable storage medium provided by this application can be, for example, a USB flash drive, but is not limited to electrical, magnetic, optical, electromagnetic, infrared, or semiconductor systems, systems, or devices, or any combination of the above. More specific examples of computer-readable storage media can include, but are not limited to: electrical connections with one or more wires, portable computer disks, hard disks, RAM (Random Access Memory), ROM (Read Only Memory), EPROM (Erasable Programmable Read Only Memory or flash memory), optical fibers, CD-ROM (CD-Read Only Memory, portable compact disk read-only memory), optical storage devices, magnetic storage devices, or any suitable combination of the above. In this embodiment, the computer-readable storage medium can be any tangible medium that contains or stores a program, and this program can be used by or in combination with an instruction execution system, system, or device. The program code contained on the computer-readable storage medium can be transmitted by any appropriate medium, including but not limited to: wires, optical cables, RF (Radio Frequency), etc., or any suitable combination of the above.

[0133] The above computer-readable storage medium can be included in the countercurrent lithium battery spray thermal management device; it can also exist separately without being assembled into the countercurrent lithium battery spray thermal management device.

[0134] The above computer-readable storage medium stores one or more programs, which, when executed by the counter-flow lithium battery spray thermal management device, cause the counter-flow lithium battery spray thermal management device to: receive inlet air through the layered flow channel structure; guide the inlet air to the wet channel at the end of the dry channel through the baffle to form a counter-flow path; control the nozzle to spray mist based on the counter-flow path and the battery temperature, and discharge the inlet air through the outlet below the wet channel.

[0135] Computer program code for performing the operations of this application may be written in one or more programming languages or combinations thereof. The programming languages include object-oriented programming languages such as Java, Smalltalk, C++, and also include conventional procedural programming languages such as the "C" language or similar programming languages. The program code may execute entirely on the user's computer, partially on the user's computer, execute as a stand-alone software package, execute partially on the user's computer and partially on a remote computer, or execute entirely on the remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any type of network, including a LAN (Local Area Network) or a WAN (Wide Area Network), or may be connected to an external computer (for example, by using an Internet service provider to connect through the Internet).

[0136] The flowcharts and block diagrams in the accompanying drawings illustrate the possible architectures, functions, and operations of systems, methods, and computer program products according to various embodiments of this application. In this regard, each block in the flowchart or block diagram may represent a module, a program segment, or a part of code that contains one or more executable instructions for implementing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the blocks may occur in a different order than marked in the accompanying drawings. For example, two consecutive blocks shown may actually be executed substantially in parallel, and they may sometimes be executed in the reverse order, depending on the functions involved. It should also be noted that each block in the block diagram and / or flowchart, and the combinations of blocks in the block diagram and / or flowchart, may be implemented by a dedicated hardware-based system for performing the specified functions or operations, or may be implemented by a combination of dedicated hardware and computer instructions.

[0137] The modules described in the embodiments of this application may be implemented in software or in hardware. In some cases, the name of the module does not constitute a limitation on the unit itself.

[0138] The readable storage medium provided by this application is a computer-readable storage medium. The computer-readable storage medium stores computer-readable program instructions (i.e., computer programs) for executing the above-mentioned countercurrent lithium battery spray thermal management method, and can solve the technical problem of how to achieve cold and heat integration and pre-cool or pre-heat the air at the inlet of the flow channel at the same time. Compared with the prior art, the beneficial effects of the computer-readable storage medium provided by this application are the same as those of the countercurrent lithium battery spray thermal management method provided by the above embodiment, and will not be elaborated here.

[0139] This application also provides a computer program product, including a computer program, and when the computer program is executed by a processor, it realizes the steps of the countercurrent lithium battery spray thermal management method as described above.

[0140] The computer program product provided by this application can solve the technical problem of how to achieve cold and heat integration and pre-cool or pre-heat the air at the inlet of the flow channel at the same time. Compared with the prior art, the beneficial effects of the computer program product provided by this application are the same as those of the countercurrent lithium battery spray thermal management method provided by the above embodiment, and will not be elaborated here.

[0141] The above are only partial embodiments of this application, and do not limit the patent scope of this application. Any equivalent structural transformation made by using the content of the specification and drawings of this application under the technical concept of this application, or any direct / indirect application in other related technical fields, is included in the patent protection scope of this application.

Claims

1. A countercurrent lithium battery spray thermal management method, characterized in that, The method is applied to a countercurrent spray thermal management system, which includes a stratified flow channel structure. The stratified flow channel structure includes a dry channel on the outside and a wet channel on the inside. The dry channel and the wet channel are separated by a baffle. A nozzle is installed above the wet channel, and the nozzles are evenly distributed in a row. The method includes: Receiving inlet air through the stratified flow channel structure; Guiding the inlet air to the wet channel at the end of the dry channel through the baffle to form a countercurrent path; Controlling the nozzle to spray a mist based on the countercurrent path and the battery temperature, and discharging the inlet air through an outlet below the wet channel.

2. The method according to claim 1, wherein The step of controlling the nozzle to spray a mist based on the countercurrent path and the battery temperature, and discharging the inlet air through an outlet below the wet channel includes: When the countercurrent path is formed, controlling the nozzle to spray a mist matching the temperature pattern towards the inlet of the wet channel according to the battery temperature to form a liquid film or steam; Adjusting the flow rate of the mist, the wind speed, humidity, and air pressure parameters of the inlet air according to the temperature pattern to control the evaporation intensity of the liquid film or the condensation intensity of the steam; Discharging the inlet air through an outlet below the wet channel.

3. The method according to claim 2, characterized in that The step of when the countercurrent path is formed, controlling the nozzle to spray a mist matching the temperature pattern towards the inlet of the wet channel according to the battery temperature to form a liquid film or steam includes: When the countercurrent path is formed and the battery temperature is greater than the first preset temperature threshold, generating a cooling instruction and starting the cold spray mode; Controlling the nozzle to spray a first liquid medium into the wet channel according to the cold spray mode to form a liquid film on the wall surface of the wet channel.

4. The method according to claim 2, wherein The step of when the countercurrent path is formed, controlling the nozzle to spray a mist matching the temperature pattern towards the inlet of the wet channel according to the battery temperature to form a liquid film or steam includes: When the countercurrent path is formed and the battery temperature is less than the second preset temperature threshold, generating a heating instruction and starting the hot spray mode, where the second preset temperature threshold is less than the first preset temperature threshold; Controlling the nozzle to spray a second liquid medium into the wet channel according to the hot spray mode to form steam in the wet channel.

5. The method according to claim 2, wherein The step of adjusting the wind speed of the inlet air according to the temperature pattern includes: When the temperature pattern is the cold spray mode, increasing the wind speed of the inlet air to the first preset wind speed range; When the temperature pattern is the hot spray mode, reducing the wind speed of the inlet air to the second preset wind speed range; Monitoring the actual wind speed in the wet channel through a wind speed sensor; Adjusting the fan speed according to the deviation value between the actual wind speed and the first preset wind speed range or the second preset wind speed range to correct the wind speed of the inlet air.

6. The method according to claim 2, wherein The step of adjusting the flow rate of the mist according to the temperature pattern includes: When the temperature pattern is the cold spray mode, calculating a first compensation coefficient according to the difference between the battery temperature and the first preset temperature threshold, and adjusting the flow rate of the mist based on the first compensation coefficient; When the temperature mode is the hot spray mode, calculate a second compensation coefficient according to the difference between the battery temperature and a second preset temperature threshold, and adjust the flow rate of the spray based on the second compensation coefficient, where the second preset temperature threshold is less than the first preset temperature threshold.

7. The method according to claim 6, wherein The step of calculating a first compensation coefficient according to the difference between the battery temperature and the first preset temperature threshold and adjusting the flow rate of the spray based on the first compensation coefficient when the temperature mode is the cold spray mode includes: When the temperature mode is the cold spray mode, calculate the difference between the battery temperature and the first preset temperature threshold; Obtain a first compensation coefficient according to the difference and a preset temperature value; Perform a linear correction on the flow rate of the spray according to the first compensation coefficient to obtain a target spray flow rate; Monitor the actual spray flow rate of the nozzle through a flow meter; When the deviation between the actual spray flow rate and the target spray flow rate is greater than a preset flow tolerance, trigger a stepped adjustment of the solenoid valve opening until the deviation is less than the preset flow tolerance.

8. A countercurrent lithium battery spray thermal management device, characterized in that, The device includes: A stratified flow channel module for receiving inlet air through a stratified flow channel structure; A countercurrent guiding module for guiding the inlet air to a wet channel at the end of a dry channel through a baffle to form a countercurrent path; A spray control module for controlling a nozzle to spray a spray based on the countercurrent path and the battery temperature, and discharging the inlet air through an outlet below the wet channel.

9. A countercurrent lithium battery spray thermal management device, characterized in that, The device includes a memory, a processor, and a computer program stored on the memory and executable on the processor, where the computer program is configured to implement the steps of the countercurrent lithium battery spray thermal management method according to any one of claims 1 to 7.

10. A storage medium, characterized in that, The storage medium is a computer-readable storage medium, and a computer program is stored on the storage medium. When the computer program is executed by a processor, it implements the steps of the countercurrent lithium battery spray thermal management method according to any one of claims 1 to 7.

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