Battery temperature adjusting device, battery system and temperature adjusting method

Abstract

The invention relates to a battery temperature adjusting device, a battery system and a temperature adjusting method, in the device, an accommodating cavity communicates with an atomization cavity, and the accommodating cavity accommodates a battery pack and a first liquid immersion liquid; the transmission assembly communicates with the containing cavity and transmits at least part of the first liquid immersion liquid in the containing cavity. The atomization module is communicated with the transmission assembly and the atomization cavity, the atomization module atomizes at least part of the first liquid immersion liquid transmitted by the transmission assembly to obtain atomized immersion liquid, the temperature of the battery pack is adjusted through the first liquid immersion liquid and the atomized immersion liquid, and heat management of the battery pack is achieved; the battery pack is maintained to work in a normal temperature interval, so that the temperature equalization and heat dissipation effects of the battery pack are improved, the liquid cooling cost is reduced, and the weight energy density of the battery pack is improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery temperature regulating device, a battery system and a temperature regulating method. Background Art

[0002] During the battery charging and discharging process, polarization heat and ohmic heat are generated, which makes the battery temperature too high. If there is no heat dissipation system or the power of the heat dissipation system does not match the heat generation, the life of the battery system will be reduced. In severe cases, heat spread will occur, causing fire hazards. Therefore, it is very necessary to perform thermal management on the battery system to keep the battery in a normal temperature range.

[0003] In the thermal management technology of battery systems, air cooling, indirect liquid cooling or immersion liquid cooling are usually used to adjust the temperature of the battery. Among them, the immersion liquid cooling method has better temperature uniformity and can produce a better cooling effect on the battery system. It has been increasingly widely used in high-power application scenarios.

[0004] At present, the existing battery immersion liquid cooling method has high liquid cooling cost, poor temperature equalization effect, and the weight energy density of the battery system needs to be improved. Summary of the invention

[0005] Based on this, a battery temperature adjustment device, a battery system and a temperature adjustment method are provided.

[0006] In a first aspect, the present application provides a battery temperature regulating device, comprising:

[0007] A box body, wherein the box body is provided with a receiving cavity, an atomizing cavity is provided on the receiving cavity, the receiving cavity and the atomizing cavity are communicated, and the receiving cavity is used to receive the battery pack and the first liquid immersion liquid;

[0008] A transmission component, the transmission component is connected to the accommodating chamber, and the transmission component is used to transmit at least part of the first liquid immersion liquid in the accommodating chamber;

[0009] an atomizing module, the atomizing module being connected to the transmission component and the atomizing chamber, and the atomizing module being used to atomize at least a portion of the first liquid immersion liquid transmitted by the transmission component to obtain a mist-like immersion liquid;

[0010] The processing module is connected to the atomization module and the transmission component. The processing module is configured to obtain the current battery cell temperature of the battery pack, and control the atomization module and the transmission component to work according to the preset battery cell temperature and the current battery cell temperature to adjust the temperature of the battery pack.

[0011] In one embodiment, the battery temperature regulation device also includes a processing module, which is connected to the atomization module and the transmission component. The processing module is configured to obtain the current battery cell temperature of the battery pack, and control the atomization module and the transmission component to operate according to the preset battery cell temperature and the current battery cell temperature to regulate the temperature of the battery pack.

[0012] In one of the embodiments, the processing module is further configured to adjust the liquid height and / or liquid flow rate of the first liquid immersion liquid according to the preset battery core temperature and the current battery core temperature.

[0013] In one of the embodiments, the battery temperature regulating device further includes a fan module;

[0014] The fan module is connected to the atomizing chamber, the fan module is connected to the processing module, and the fan module is used for dispersing and transmitting the mist immersion liquid to the atomizing chamber.

[0015] In one of the embodiments, the processing module is also configured to obtain the current immersion liquid phase change temperature, and adjust the output power of the fan module and / or the output power of the atomization module according to the preset immersion liquid phase change temperature and the current immersion liquid phase change temperature; the preset immersion liquid phase change temperature is 30°C to 45°C.

[0016] In one of the embodiments, the battery temperature regulating device further includes a partition, which is arranged between the accommodating chamber and the atomizing chamber;

[0017] The partition is provided with a through hole group, and the through hole group is connected with the accommodating cavity and the atomizing cavity respectively.

[0018] In one embodiment, the partition includes at least two plate surface areas corresponding to different battery core temperatures, and the through hole group includes at least two through holes; the plate surface area is provided with a plurality of through holes;

[0019] The total area of ​​the through holes in the board area corresponding to the high temperature of the battery cell is greater than the total area of ​​the through holes in the temperature area corresponding to the low temperature of the battery cell.

[0020] In one embodiment, the number of through holes in the board area corresponding to the high battery cell temperature is greater than the number of through holes in the temperature area corresponding to the low battery cell temperature; and / or the diameter of the through holes in the board area corresponding to the high battery cell temperature is greater than the diameter of the through holes in the temperature area corresponding to the low battery cell temperature.

[0021] In one embodiment, the through hole group is used to transfer the mist immersion liquid in the atomization chamber to the accommodating chamber, so that at least part of the mist immersion liquid in the accommodating chamber contacts the battery pack, causing the corresponding part of the mist immersion liquid to change phase and obtain gaseous immersion liquid; and / or,

[0022] At least part of the mist immersion liquid in the accommodating chamber contacts and flows through the battery pack before entering the first liquid immersion liquid in the accommodating chamber.

[0023] In one embodiment, at least part of the gaseous immersion liquid in the accommodating chamber rises to the top surface of the accommodating chamber, causing a corresponding part of the gaseous immersion liquid to change phase to obtain a second liquid immersion liquid, and at least part of the second liquid immersion liquid falls back and contacts the battery pack to regulate the temperature of the battery pack.

[0024] In one embodiment, the box body is provided with a first interface and a second interface, and the first interface and the second interface are provided near the bottom surface of the accommodating cavity;

[0025] The first interface and the second interface are connected to the accommodating cavity.

[0026] In one embodiment, the liquid height of the first liquid immersion liquid is 20 mm to 500 mm;

[0027] and / or, the liquid flow rate of the first liquid immersion liquid is 0.1 L / min to 15 L / min;

[0028] And / or, the first liquid immersion liquid has a liquid temperature of 10°C to 38°C.

[0029] In a second aspect, the present application provides a battery system, including a battery pack and a battery temperature regulating device as described above, wherein the battery pack is disposed in the battery temperature regulating device.

[0030] In a third aspect, the present application further provides a temperature adjustment method, which is applied to the above-mentioned battery system and comprises the following steps:

[0031] Get the current cell temperature of the battery pack;

[0032] According to the preset battery core temperature and the current battery core temperature, the atomization module is controlled to work so that the atomization module atomizes at least a portion of the first liquid immersion liquid transmitted by the transmission component to obtain a mist immersion liquid;

[0033] The battery pack is temperature regulated based on the first liquid immersion fluid and the mist immersion fluid.

[0034] In one embodiment, after the step of obtaining the current battery cell temperature of the battery pack, the step further includes:

[0035] The liquid height and / or liquid flow rate of the first liquid immersion liquid is adjusted according to the preset battery core temperature and the current battery core temperature.

[0036] In one embodiment, the step of adjusting the liquid height of the first liquid immersion liquid according to the preset battery core temperature and the current battery core temperature includes:

[0037] When the height of the first liquid immersion liquid is less than the height of the battery pack, querying the temperature-height mapping relationship according to the preset battery cell temperature to obtain a target liquid height corresponding to the first liquid immersion liquid;

[0038] The liquid height of the first liquid immersion liquid is adjusted according to the target liquid height.

[0039] In one embodiment, the step of establishing the temperature-altitude mapping relationship includes:

[0040] Obtaining a heat exchange area, a characteristic length, a heat absorption amount, a heat generation power, a liquid flow rate of the first liquid immersion liquid, and a temperature difference between the battery pack and the first liquid immersion liquid based on a preset working time of the battery pack;

[0041] According to the liquid flow rate, characteristic length and preset liquid dynamic viscosity, the Reynolds value is obtained;

[0042] According to the Reynolds number and Prandtl constant, the Nusselt number is obtained;

[0043] According to the Nusselt value, characteristic length and preset liquid thermal conductivity, the heat transfer coefficient is obtained;

[0044] According to the heat transfer coefficient, heat transfer area and temperature difference, the heat transfer power of the battery pack is obtained;

[0045] According to the amount of heat absorbed and the preset working time, the heat absorption power of the battery pack is obtained;

[0046] According to the heating power, heat transfer power and heat absorption power, the mapping relationship between temperature and height is obtained.

[0047] In one embodiment, the step of adjusting the liquid flow rate of the first liquid immersion liquid according to the preset battery core temperature and the current battery core temperature includes:

[0048] When the height of the first liquid immersion liquid is greater than or equal to the height of the battery pack, querying a mapping relationship between temperature and flow rate according to a preset battery cell temperature to obtain a target liquid flow rate corresponding to the first liquid immersion liquid;

[0049] The liquid flow rate of the first liquid immersion liquid is adjusted according to the target liquid flow rate.

[0050] One of the above technical solutions has the following advantages and beneficial effects:

[0051] The above-mentioned battery temperature regulating device includes a box body, a transmission component and an atomizing module. The box body is provided with a accommodating chamber, and an atomizing chamber is provided on the accommodating chamber. The accommodating chamber and the atomizing chamber are connected, and the accommodating chamber is used to accommodate a battery pack and a first liquid immersion liquid; the transmission component is connected to the accommodating chamber, and the transmission component is used to transmit at least part of the first liquid immersion liquid in the accommodating chamber; the atomizing module is connected to the transmission component and the atomizing chamber, and the atomizing module is used to atomize at least part of the first liquid immersion liquid transmitted by the transmission component to obtain a mist immersion liquid, and the temperature of the battery pack is regulated by the first liquid immersion liquid and the mist immersion liquid, so as to achieve thermal management of the battery pack, so that the battery pack is maintained in a normal temperature range for operation. The present application transmits at least part of the first liquid immersion liquid for atomization, thereby obtaining a mist immersion liquid, and regulates the temperature of the battery pack by the first liquid immersion liquid and the mist immersion liquid in the accommodating chamber, thereby improving the uniform temperature and heat dissipation effect of the battery pack, while reducing the liquid cooling cost and improving the weight energy density of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] Figure 1 This is a first flow diagram of the battery temperature adjustment device in an embodiment of the present application;

[0053] Figure 2 This is a first circuit diagram of the battery temperature regulating device in an embodiment of the present application;

[0054] Figure 3 This is a schematic diagram of the exploded structure of the battery temperature regulating device in an embodiment of the present application;

[0055] Figure 4 This is a second circuit diagram of the battery temperature regulating device in an embodiment of the present application;

[0056] Figure 5 This is a schematic diagram of a partial cross-sectional structure of a battery temperature regulating device in an embodiment of the present application;

[0057] Figure 6 This is a schematic diagram of the second flow direction of the battery temperature adjustment device in an embodiment of the present application;

[0058] Figure 7 This is a schematic diagram of the first process of the temperature adjustment method in the embodiment of the present application;

[0059] Figure 8 This is a second flow chart of the temperature adjustment method in the embodiment of the present application;

[0060] Fig. 9 This is a schematic diagram of the process of adjusting the liquid height in the embodiment of the present application;

[0061] Fig.10 This is a schematic diagram of the flow chart of the liquid flow rate adjustment step in the embodiment of the present application;

[0062] Fig.11 Schematic diagram of the curve of the mapping relationship between temperature and height in the embodiment of the present application.

[0063] Reference numerals:

[0064] 10. Box body; 110. Accommodation chamber; 120. Atomization chamber; 20. Battery pack; 30. Transmission assembly; 40. Atomization module; 50. Processing module; 60. Fan module; 70. Partition; 710. Through hole; 810. First interface; 820. Second interface. DETAILED DESCRIPTION

[0065] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0066] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0067] In addition, the term "plurality" shall mean two or more.

[0068] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0069] In one embodiment, if Figure 1 and Figure 2As shown, a battery temperature regulating device is provided, including a box body 10, a transmission component 30 and an atomization module 40, the box body 10 is provided with a accommodating chamber 110, and an atomization chamber 120 is provided on the accommodating chamber 110, the accommodating chamber 110 and the atomization chamber 120 are connected, and the accommodating chamber 110 is used to accommodate a battery pack 20 and a first liquid immersion liquid; the transmission component 30 is connected to the accommodating chamber 110, and the transmission component 30 is used to transmit at least part of the first liquid immersion liquid in the accommodating chamber 110; the atomization module 40 is connected to the transmission component 30 and the atomization chamber 120, and the atomization module 40 is used to atomize at least part of the first liquid immersion liquid transmitted by the transmission component 30 to obtain a mist-like immersion liquid.

[0070] Among them, the battery pack 20 may be composed of a plurality of single cells, and each single cell may be connected in series and / or in parallel. The single cell may be a regular shape structure such as a square or a circle. It should be noted that the single cell may also be an irregular shape structure. The single cell may be a lithium-ion cell. For example, the single cell may be a lithium iron phosphate cell, a ternary cell or a manganese iron lithium cell. Exemplarily, the battery pack 20 may be applied to a battery system (such as a battery pack).

[0071] The box body 10 may be a box body 10 made of metal or non-metal, and the shape of the box body 10 may be, but is not limited to, square or cylindrical. The box body 10 is provided with a receiving chamber 110, and the receiving chamber 110 is used to receive the battery pack 20. The receiving chamber 110 is also used to receive the first liquid immersion liquid. For example, the box body 10 is provided with a corresponding interface connected to the receiving chamber 110, and the first liquid immersion liquid is injected into the receiving chamber 110 through the corresponding interface, and the first liquid immersion liquid in the receiving chamber 110 can also be discharged through the corresponding interface, thereby realizing the circulation of the first liquid immersion liquid in the receiving chamber 110, so that the first liquid immersion liquid can remove the heat generated by the battery pack 20 during the charging and discharging process from the box body 10.

[0072] The first liquid immersion liquid refers to an immersion coolant in a liquid state. The first liquid immersion liquid may be, but is not limited to, hydrofluoroether, a water / ethylene glycol mixed solution, liquid water, hydrocarbons, silicone oil or an ester coolant. The housing 10 is also provided with an atomizing chamber 120, which is located above the accommodating chamber 110, and the atomizing chamber 120 is connected to the accommodating chamber 110, so that the mist immersion liquid generated in the atomizing chamber 120 can enter the accommodating chamber 110 to adjust the temperature of the battery pack 20 in the accommodating chamber 110.

[0073] The transmission component 30 can be used to transmit at least part of the first liquid immersion liquid in the accommodating chamber 110 to the atomizing module 40, so that the atomizing module 40 atomizes the corresponding first liquid immersion liquid. Exemplarily, the transmission component 30 may include a transmission pipeline and a pump body, the first end of the transmission pipeline is connected to the accommodating chamber 110, the second end of the transmission pipeline is connected to the atomizing module 40, and the pump body is connected to the transmission pipeline. By starting the pump body, at least part of the first liquid immersion liquid in the accommodating chamber 110 can be extracted and transmitted through the transmission pipeline to transmit the corresponding part of the first liquid immersion liquid to the atomizing module 40.

[0074] The atomizing module 40 may be arranged on the atomizing chamber 120, for example, the atomizing chamber 120 is provided with an opening, and the atomizing module 40 may be sealed and arranged on the opening of the atomizing chamber 120 by screwing or clamping, and the atomizing output end of the atomizing module 40 faces the atomizing chamber 120. When the atomizing module 40 is started, the atomizing module 40 may atomize the corresponding part of the first liquid immersion liquid transmitted by the transmission component 30, and output the mist immersion liquid to the atomizing chamber 120, so that the atomizing chamber 120 produces the mist immersion liquid. Exemplary. The atomizing module 40 may be, but is not limited to, an ultrasonic atomizing module 40; in another example, the atomizing module 40 may also adopt a non-high-pressure atomizing module 40 such as a mechanical atomizing module 40. By adopting non-high-pressure atomization, the pressure on the wall of the box 10 during the circulation of the first liquid immersion liquid is small, which can reduce the sealing level requirements for the box 10, thereby reducing the cost.

[0075] The first liquid immersion liquid is injected into the accommodating cavity 110, and the first liquid immersion liquid in the accommodating cavity 110 immerses at least part of the battery pack 20. The first liquid immersion liquid in the accommodating cavity 110 can circulate, and the heat generated by the battery pack 20 during the charging and discharging process can be discharged to the outside of the box 10 through the first liquid immersion liquid. The transmission component 30 can extract at least part of the first liquid immersion liquid and transmit it to the atomization module 40, so that the atomization module 40 can atomize the corresponding first liquid immersion liquid, and then generate a mist immersion liquid in the atomization cavity 120 to increase the total surface area of ​​all immersion liquids, that is, through a certain amount of immersion liquid, the contact area between the immersion liquid and the battery pack 20 is increased.

[0076] The mist immersion liquid can be transferred downward into the accommodation cavity 110 based on gravity, and the mist immersion liquid contacts the surface of the battery pack 20. Part of the mist immersion liquid absorbs the heat of the battery pack 20 and undergoes a phase change to obtain a gaseous immersion liquid, and the gaseous immersion liquid rises to the top surface of the accommodation cavity 110. Since the top temperature of the battery pack 20 is relatively low, the gaseous immersion liquid can release heat and then turn back into a liquid immersion liquid. Under the action of its own gravity, the liquid immersion liquid can fall back to the surface of the battery pack 20 again, thereby achieving a double cooling of the battery pack 20 and temperature regulation of the battery pack 20.

[0077] In the above-mentioned embodiment, a accommodating chamber 110 is provided on the housing 10, an atomizing chamber 120 is provided on the accommodating chamber 110, the accommodating chamber 110 and the atomizing chamber 120 are connected, the accommodating chamber 110 accommodates the battery pack 20 and the first liquid immersion liquid; the transmission component 30 is connected to the accommodating chamber 110, the atomizing module 40 is connected to the transmission component 30 and the atomizing chamber 120, the transmission component 30 transmits at least part of the first liquid immersion liquid in the accommodating chamber 110; the atomizing module 40 atomizes at least part of the first liquid immersion liquid transmitted by the transmission component 30 to obtain a mist-like immersion liquid, and the temperature of the battery pack is adjusted by the first liquid immersion liquid and the mist-like immersion liquid, so as to realize thermal management of the battery pack 20, so that the battery pack 20 is maintained in a normal temperature range for operation. The present application obtains a mist immersion liquid by transmitting at least a portion of the first liquid immersion liquid for atomization, and adjusts the temperature of the battery pack 20 by the first liquid immersion liquid and the mist immersion liquid in the accommodating cavity 110, thereby improving the temperature uniformity and heat dissipation effect of the battery pack 20, while reducing the liquid cooling cost and improving the weight energy density of the battery pack 20.

[0078] In one embodiment, the battery temperature regulation device also includes a processing module 50, which is connected to the atomization module 40 and the transmission component 30. The processing module 50 is configured to obtain the current battery cell temperature of the battery pack 20, and control the atomization module 40 and the transmission component 30 to work according to the preset battery cell temperature and the current battery cell temperature to regulate the temperature of the battery pack 20.

[0079] The processing module 50 may be, but is not limited to, a BMS (Battery Management System). For example, the processing module 50 may also be a separately provided processor. The preset cell temperature may be an average cell temperature of the battery pack 20 preset by the system. For example, the preset cell temperature may be a suitable temperature range of the battery pack 20. The current cell temperature may be an average cell temperature currently collected. For example, if the battery pack 20 includes 4 single cells, the current temperatures of the 4 single cells may be collected respectively, and the current temperatures of the 4 single cells may be averaged to obtain the current cell temperature of the corresponding battery pack 20.

[0080] Based on the processing module 50 electrically connecting the atomizing module 40 and the transmission component 30 respectively, the first liquid immersion liquid is injected into the accommodating chamber 110, and the first liquid immersion liquid in the accommodating chamber 110 immerses at least part of the battery pack 20. The first liquid immersion liquid in the accommodating chamber 110 can circulate, and the heat generated by the battery pack 20 during the charging and discharging process can be discharged to the outside of the box 10 through the first liquid immersion liquid. The processing module 50 can control the transmission component 30 and the atomizing module 40 to work, and then the transmission component 30 can extract at least part of the first liquid immersion liquid and transmit it to the atomizing module 40, so that the atomizing module 40 can atomize the corresponding first liquid immersion liquid, and then generate a mist immersion liquid in the atomizing chamber 120 to increase the total surface area of ​​all immersion liquids, that is, through a certain amount of immersion liquid, the contact area between the immersion liquid and the battery pack 20 is increased.

[0081] In the above-mentioned embodiment, a accommodating chamber 110 is provided on the housing 10, an atomizing chamber 120 is provided on the accommodating chamber 110, the accommodating chamber 110 and the atomizing chamber 120 are connected, the accommodating chamber 110 accommodates the battery pack 20 and the first liquid immersion liquid; the transmission component 30 is connected to the accommodating chamber 110, the atomizing module 40 is connected to the transmission component 30 and the atomizing chamber 120, the processing module 50 is connected to the atomizing module 40 and the transmission component 30, and the transmission component 30 transmits at least part of the first liquid immersion liquid in the accommodating chamber 110; the atomizing module 40 atomizes at least part of the first liquid immersion liquid transmitted by the transmission component 30 to obtain a mist-like immersion liquid; the processing module 50 is configured to obtain the current battery cell temperature of the battery pack 20, and control the atomizing module 40 and the transmission component 30 to work according to the preset battery cell temperature and the current battery cell temperature, so as to adjust the temperature of the battery pack 20, realize the thermal management of the battery pack 20, and make the battery pack 20 maintain working in a normal temperature range. The present application obtains a mist immersion liquid by transmitting at least a portion of the first liquid immersion liquid for atomization, and adjusts the temperature of the battery pack 20 by the first liquid immersion liquid and the mist immersion liquid in the accommodating cavity 110, thereby improving the temperature uniformity and heat dissipation effect of the battery pack 20, while reducing the liquid cooling cost and improving the weight energy density of the battery pack 20.

[0082] In one embodiment, the processing module 50 is further configured to adjust the liquid height and / or liquid flow rate of the first liquid immersion liquid according to the preset battery core temperature and the current battery core temperature.

[0083] For example, the processing module 50 can also be used to compare the current battery cell temperature with the preset battery cell temperature, and adjust the liquid height of the first liquid immersion liquid according to the processing result. Exemplarily, when the height of the first liquid immersion liquid is less than the height of the battery pack 20, the temperature and height mapping relationship is queried according to the preset battery cell temperature to obtain the target liquid height corresponding to the first liquid immersion liquid, and then the liquid height of the first liquid immersion liquid is adjusted according to the target liquid height.

[0084] For another example, the processing module 50 can also be used to compare the current battery cell temperature with the preset battery cell temperature, and adjust the liquid flow rate of the first liquid immersion liquid according to the processing result. Exemplarily, when the height of the first liquid immersion liquid is greater than or equal to the height of the battery pack 20, the temperature and flow rate mapping relationship is queried according to the preset battery cell temperature to obtain the target liquid flow rate corresponding to the first liquid immersion liquid, and then the liquid flow rate of the first liquid immersion liquid is adjusted according to the target liquid flow rate, so as to achieve accurate control of the battery pack 20 to work in a suitable temperature range.

[0085] In one embodiment, Figure 4 As shown, the battery temperature regulating device further includes a fan module 60 ; the fan module 60 is connected to the atomizing chamber 120 , and the fan module 60 is connected to the processing module 50 , and the fan module 60 is used to disperse and transmit the mist immersion liquid to the atomizing chamber 120 .

[0086] The fan module 60 may be, but is not limited to, a turbofan or a centrifugal fan. The fan module 60 may be used to disperse the mist immersion liquid output by the atomization module 40 into the atomization chamber 120, so that the mist immersion liquid in the atomization chamber 120 is evenly distributed, and when the mist immersion liquid in the atomization chamber 120 is transmitted to the accommodating chamber 110, the mist immersion liquid can be dispersed on the surface of the battery pack 20, thereby increasing the contact area between the mist immersion liquid and the battery pack 20.

[0087] Exemplarily, the fan module 60 can be arranged adjacent to the output end of the atomization module 40; in another example, the fan module 60 can also be arranged at the top of the atomization chamber 120. Based on the processing module 50 electrically connected to the fan module 60, the fan module 60 can be controlled to work, and the mist immersion liquid is dispersedly transmitted to the atomization chamber 120 through the fan module 60, so that the atomization chamber 120 is filled with mist immersion liquid, thereby realizing the distribution control of the mist immersion liquid. It should be noted that the fan module 60 can also be used to accelerate the transmission of the mist immersion liquid in the atomization chamber 120 to the accommodating chamber 110, thereby improving the heat exchange efficiency between the mist immersion liquid and the battery pack 20.

[0088] In one embodiment, the processing module 50 is further configured to obtain the current immersion liquid phase change temperature, and adjust the output power of the fan module 60 and / or the output power of the atomization module 40 according to the preset immersion liquid phase change temperature and the current immersion liquid phase change temperature.

[0089] The current immersion liquid phase change temperature refers to the temperature at which the mist immersion liquid undergoes a phase change. The preset immersion liquid phase change temperature refers to a phase change temperature preset by the system. The preset immersion liquid phase change temperature may be a temperature range value; for example, the preset immersion liquid phase change temperature may be set to 30°C to 45°C.

[0090] Since the wind force of the fan module 60 will affect the flow rate of the mist immersion liquid, the power of the atomization module 40 will affect the particle size of the output mist immersion liquid, and different particle sizes of the mist immersion liquid and the flow rate of the mist immersion liquid will change the phase change temperature of the mist immersion liquid, and then the processing module 50 can obtain the current immersion liquid phase change temperature of the mist immersion liquid, and compare the current immersion liquid phase change temperature with the preset immersion liquid phase change temperature, and adjust the output power of the fan module 60 and / or the output power of the atomization module 40 according to the comparison result. Exemplarily, increasing the output power of the fan module 60 can reduce the phase change temperature of the mist immersion liquid; increasing the output power of the atomization module 40 can reduce the phase change temperature of the mist immersion liquid. By adjusting the output power of the fan module 60 and / or the output power of the atomization module 40, the phase change temperature of the mist immersion liquid can be adjusted, and the heat dissipation effect of the battery pack 20 can be improved.

[0091] In one embodiment, Figure 3 and Figure 5 As shown, the battery temperature regulating device further includes a partition 70 , which is disposed between the accommodating chamber 110 and the atomizing chamber 120 ; the partition 70 is provided with a through hole group, which respectively connects the accommodating chamber 110 and the atomizing chamber 120 .

[0092] For example, the partition 70 can be used to divide the space in the box body 10 to form the accommodating chamber 110 and the atomizing chamber 120 in the box body 10. The partition 70 is provided with a through hole group, and the through hole group can be composed of a plurality of through holes.

[0093] Based on the sequential communication of the atomizing chamber 120, the through hole group and the accommodating chamber 110, when the transmission component 30 and the atomizing module 40 are started, the transmission component 30 transmits at least part of the first liquid immersion liquid in the accommodating chamber 110 to the atomizing module 40, so that the atomizing module 40 atomizes the corresponding first liquid immersion liquid and outputs the mist immersion liquid to the atomizing chamber 120, so that the atomizing chamber 120 produces the mist immersion liquid. The mist immersion liquid in the atomizing chamber 120 can be transmitted to the accommodating chamber 110 through the through hole group, and the mist immersion liquid contacts the surface of the battery pack 20, and the corresponding part of the mist immersion liquid absorbs the heat of the battery pack 20 to undergo a phase change, thereby obtaining a gaseous immersion liquid, and the gaseous immersion liquid rises to the top surface of the accommodating chamber 110. Based on the relatively low temperature at the top of the battery pack 20, the gaseous immersion liquid can release heat and then turn back into liquid immersion liquid. Under the action of its own gravity, the liquid immersion liquid can fall back to the surface of the battery pack 20 again, thereby achieving double cooling of the battery pack 20 and temperature regulation of the battery pack 20, thereby improving the uniform temperature and heat dissipation effect of the battery pack 20, while reducing the liquid cooling cost and improving the weight energy density of the battery pack 20.

[0094] In one embodiment, the partition 70 includes at least two board surface areas corresponding to different battery cell temperatures, and the through-hole group includes at least two through-holes 710; a plurality of through-holes 710 are arranged in the board surface area; and the total area of ​​the through-holes 710 in the board surface area corresponding to the high battery cell temperature is greater than the total area of ​​the through-holes 710 in the temperature area corresponding to the low battery cell temperature.

[0095] The through hole 710 may be, but is not limited to, a circular hole or an elliptical hole. The partition 70 may be provided with at least two plate surface areas corresponding to different battery cell temperatures based on the distribution of the through holes 710, thereby adjusting the temperature difference within the battery pack 20. For example, the total area of ​​the through hole 710 may be increased corresponding to the plate surface area with a high battery cell temperature, so as to achieve cooling of the corresponding part of the battery pack 20 through more mist immersion liquid.

[0096] Exemplarily, the partition 70 is provided with a first plate surface area and a second plate surface area, the battery cell temperature corresponding to the first plate surface area is higher than the battery cell temperature corresponding to the second plate surface area, the first plate surface area is provided with a plurality of through holes 710, the second plate surface area is provided with a plurality of through holes 710, and the total area of ​​the through holes 710 arranged in the first plate surface area is larger than the total area of ​​the through holes 710 in the second temperature area, so that the flow rate of the mist immersion liquid through the first plate surface area is greater than the flow rate through the second plate surface area, so that more mist immersion liquid can contact the battery cell positions with higher temperatures in the resistor group, thereby improving the heat dissipation efficiency of the battery pack 20 and improving the temperature equalization effect of the battery pack 20.

[0097] In one embodiment, the number of through holes 710 in the board area corresponding to the high battery cell temperature is greater than the number of through holes 710 in the temperature area corresponding to the low battery cell temperature; and / or the diameter of the through holes 710 in the board area corresponding to the high battery cell temperature is greater than the diameter of the through holes 710 in the temperature area corresponding to the low battery cell temperature.

[0098] Among them, the board surface area corresponding to the high battery cell temperature refers to the board surface area corresponding to the battery cell temperature in the battery pack 20; the board surface area corresponding to the high battery cell temperature refers to the board surface area corresponding to the low battery cell temperature in the battery pack 20.

[0099] For example, the partition 70 is provided with a first plate surface area and a second plate surface area, the battery cell temperature corresponding to the first plate surface area is higher than the battery cell temperature corresponding to the second plate surface area, the first plate surface area is provided with 20 through holes 710, and the second plate surface area is provided with 15 through holes 710, so that the total area of ​​the through holes 710 in the first plate surface area is larger than the total area of ​​the through holes 710 in the second temperature area, and thus the flow rate of the mist immersion liquid through the first plate surface area is greater than the flow rate through the second plate surface area, so that more mist immersion liquid can contact the battery cell position with higher temperature in the resistor group, thereby improving the heat dissipation efficiency of the battery pack 20 and improving the temperature equalization effect of the battery pack 20.

[0100] For another example, the partition 70 is provided with a first board surface area and a second board surface area, the battery cell temperature corresponding to the first board surface area is higher than the battery cell temperature corresponding to the second board surface area, the first board surface area is provided with 10 first through holes 710, the second board surface area is provided with 10 second through holes 710, and the diameter of the first through holes 710 is larger than the diameter of the second through holes 710, so that the total area of ​​the through holes 710 in the first board surface area is larger than the total area of ​​the through holes 710 in the second temperature area, and thus the flow rate of the mist immersion liquid through the first board surface area is greater than the flow rate through the second board surface area, so that more mist immersion liquid can contact the battery cell position with higher temperature in the resistor group, thereby improving the heat dissipation efficiency of the battery pack 20 and improving the temperature equalization effect of the battery pack 20.

[0101] In one embodiment, the through hole group is used to transfer the mist immersion liquid in the atomization chamber 120 to the accommodating chamber 110, so that at least part of the mist immersion liquid in the accommodating chamber 110 contacts the battery pack 20, causing the corresponding part of the mist immersion liquid to change phase and obtain gaseous immersion liquid; and / or, at least part of the mist immersion liquid in the accommodating chamber 110 contacts and flows through the battery pack 20 and then enters the first liquid immersion liquid in the accommodating chamber 110.

[0102] At least part of the gaseous immersion liquid in the accommodating chamber 110 rises to the top surface of the accommodating chamber 110 , causing a corresponding part of the gaseous immersion liquid to change phase to obtain a second liquid immersion liquid, and at least part of the second liquid immersion liquid falls back and contacts the battery pack 20 to adjust the temperature of the battery pack 20 .

[0103] For example, when the transmission component 30 and the atomization module 40 are started, the transmission component 30 transmits at least part of the first liquid immersion liquid in the accommodating chamber 110 to the atomization module 40, so that the atomization module 40 atomizes the corresponding first liquid immersion liquid and outputs the mist immersion liquid to the atomization chamber 120, so that the atomization chamber 120 produces the mist immersion liquid. The mist immersion liquid in the atomization chamber 120 can be transmitted to the accommodating chamber 110 through the hole group, at least part of the mist immersion liquid contacts the surface of the battery pack 20, and the corresponding part of the mist immersion liquid absorbs the heat of the battery pack 20 to undergo a phase change, thereby obtaining a gaseous immersion liquid, and the gaseous immersion liquid rises to the top surface of the accommodating chamber 110. Based on the relatively low temperature at the top of the battery pack 20, the gaseous immersion liquid can release heat and then turn into liquid immersion liquid again. Under the action of its own gravity, the liquid immersion liquid can fall back to the surface of the battery pack 20 again, thereby achieving two cooling of the battery pack 20; when the phase change temperature of the misty immersion liquid is high, the corresponding part of the misty immersion liquid cannot undergo a phase change, and then the misty immersion liquid of this part flows through the battery pack 20 and enters the first liquid immersion liquid in the accommodating cavity 110, thereby achieving cyclic heat dissipation of the immersion liquid, thereby improving the uniform temperature and heat dissipation effect of the battery pack 20, while reducing the liquid cooling cost and improving the weight energy density of the battery pack 20.

[0104] In one embodiment, the box body 10 is provided with a first interface 810 and a second interface 820 , and the first interface 810 and the second interface 820 are arranged close to the bottom surface of the accommodating cavity 110 ; the first interface 810 and the second interface 820 are connected to the accommodating cavity 110 .

[0105] The first interface 810 and the second interface 820 are used to connect the immersion liquid device, and the immersion liquid device can be used to adjust the temperature of the first liquid immersion liquid, so that the immersion liquid device injects the first liquid immersion liquid of a preset temperature into the receiving chamber 110 through the first interface 810. Exemplarily, the liquid temperature of the first liquid immersion liquid is 10°C to 38°C; for example, the liquid temperature of the first liquid immersion liquid can be set to 10°C, 20°C or 38°C, etc. The immersion liquid device can also be used to control the liquid flow rate of the first liquid immersion liquid, so that the immersion liquid device injects the first liquid immersion liquid of a preset flow rate into the receiving chamber 110 through the first interface 810; the immersion liquid device can also extract the first liquid immersion liquid into the receiving chamber 110 through the second interface 820 based on the preset flow rate. Exemplarily, the liquid flow rate of the first liquid immersion liquid is 0.1 L / min to 15 L / min; for example, the liquid flow rate of the first liquid immersion liquid can be set to 0.1 L / min, 10 L / min, or 15 L / min.

[0106] The first interface 810 is disposed near the bottom surface of the accommodating chamber 110, and the second interface 820 is disposed near the bottom surface of the accommodating chamber 110. For example, the distance between the second interface 820 and the bottom surface of the accommodating chamber 110 is smaller than the distance between the first interface 810 and the bottom surface of the accommodating chamber 110. Based on the accommodating chamber 110 being connected to the first interface 810 and the second interface 820, respectively, the first liquid immersion liquid with a preset liquid flow rate and liquid temperature can be input into the accommodating chamber 110 through the first interface 810. When the liquid height in the accommodating chamber 110 reaches a preset height value, the first liquid immersion liquid with a preset liquid flow rate can be discharged through the second interface 820, so as to realize the circulation of the first liquid immersion liquid in the accommodating chamber 110, thereby discharging the heat generated by the battery pack 20 during the charging and discharging process from the housing 10 through the first liquid immersion liquid, so as to realize the temperature regulation of the battery pack 20 and improve the uniform temperature and heat dissipation effect of the battery pack 20.

[0107] In one example, if Figure 1 As shown, the liquid height of the first liquid immersion liquid in the receiving chamber 110 can also be adjusted by controlling the liquid input flow rate of the first interface 810 and the liquid output flow rate of the first output port. Exemplarily, the liquid height of the first liquid immersion liquid in the receiving chamber 110 is 20 mm to 500 mm, for example, the liquid height of the first liquid immersion liquid can be set to 20 mm, 50 mm or 500 mm, etc.

[0108] In one embodiment, Figure 1 As shown, the box body 10 is also provided with a third interface and a fourth interface; the fourth interface is arranged close to the bottom surface of the accommodating chamber 110, and the third interface is arranged close to the atomizing chamber 120; the fourth interface connects the accommodating chamber 110 and the transmission component 30, and the third interface connects the atomizing module 40 and the transmission component 30.

[0109] The third interface and the fourth interface are used to connect the transmission component 30, and the transmission component 30 can be used to extract the first liquid immersion liquid of a preset temperature in the accommodating chamber 110 through the fourth interface. Exemplarily, the liquid temperature of the first liquid immersion liquid extracted by the transmission component 30 is 10°C to 38°C. The transmission component 30 can also be used to control the extraction of the first liquid immersion liquid of a preset flow rate in the accommodating chamber 110 through the fourth interface. Exemplarily, the liquid flow rate of the first liquid immersion liquid extracted by the transmission component 30 is 0.1L / min to 15L / min.

[0110] The fourth interface is arranged near the bottom surface of the accommodating chamber 110, for example, the distance between the fourth interface and the bottom surface of the accommodating chamber 110 is less than or equal to the distance between the second interface 820 and the bottom surface of the accommodating chamber 110. The third interface is arranged near the atomizing chamber 120, and the transmission component 30 is connected between the fourth interface and the third interface, and then when the transmission component 30 and the atomizing module 40 are started, the transmission component 30 outputs at least part of the first liquid immersion liquid in the accommodating chamber 110 through the fourth interface, and after being transmitted by the transmission component 30, the corresponding part of the first liquid immersion liquid is transmitted to the atomizing module 40 through the third interface, so that the atomizing module 40 atomizes the corresponding first liquid immersion liquid, and outputs the mist immersion liquid to the atomizing chamber 120, so that the atomizing chamber 120 produces the mist immersion liquid. The mist immersion liquid in the atomization chamber 120 is transmitted to the accommodating chamber 110, and the mist immersion liquid contacts the surface of the battery pack 20, and then the temperature of the battery pack 20 is adjusted by the mist immersion liquid and the first liquid immersion liquid, so as to achieve improved temperature uniformity and heat dissipation effects on the battery pack 20 with a limited amount of immersion liquid, while reducing the liquid cooling cost and improving the weight energy density of the battery pack 20.

[0111] In one example, a liquid plate is further provided at the bottom of the box 10 , and the battery pack 20 is fitted on the liquid cooling plate, thereby being able to cool and dissipate heat from the bottom of the battery pack 20 , further improving the heat dissipation efficiency and temperature equalization effect of the battery pack 20 .

[0112] In one embodiment, a battery system is further provided, comprising a battery pack and a battery temperature regulating device as described above, wherein the battery pack is disposed in the battery temperature regulating device.

[0113] For the specific description of the battery pack and the battery temperature regulating device, reference may be made to the specific description of the battery pack and the battery temperature regulating device in the above embodiments, which will not be repeated here.

[0114] The battery temperature regulating device includes a box body, a transmission component, an atomization module and a processing module. The box body is provided with a accommodating chamber, and the accommodating chamber is provided with an atomization chamber. The accommodating chamber and the atomization chamber are connected, and the accommodating chamber is used to accommodate a battery pack and a first liquid immersion liquid; the transmission component is connected to the accommodating chamber, and the transmission component is used to transmit at least part of the first liquid immersion liquid in the accommodating chamber; the atomization module is connected to the transmission component and the atomization chamber, and the atomization module is used to atomize at least part of the first liquid immersion liquid transmitted by the transmission component to obtain a mist-like immersion liquid; the processing module is connected to the atomization module and the transmission component, and the processing module is configured to obtain the current battery cell temperature of the battery pack, and control the atomization module and the transmission component to work according to the preset battery cell temperature and the current battery cell temperature, so as to regulate the temperature of the battery pack, realize thermal management of the battery system, and make the battery system maintain working in a normal temperature range.

[0115] In the above embodiment, at least a portion of the first liquid immersion liquid is transmitted for atomization to obtain a mist immersion liquid, and the temperature of the battery pack is adjusted by the first liquid immersion liquid and the mist immersion liquid in the accommodating cavity, thereby improving the temperature uniformity and heat dissipation effect of the battery system, while reducing the liquid cooling cost of the battery system and improving the weight energy density of the battery system.

[0116] In one example, if Figure 6 As shown, the transmission component can be arranged inside the box, and one end of the transmission component is arranged adjacent to the first interface of the box, so that the first liquid immersion liquid can be transmitted to the atomization module through the transmission component to atomize the transmitted first liquid immersion liquid, thereby obtaining a mist-like immersion liquid, thereby further increasing the volume energy density of the battery pack.

[0117] In one embodiment, Figure 7 As shown, a temperature adjustment method is also provided, which is applied to the above-mentioned battery system and includes the following steps:

[0118] Step S710, obtaining the current cell temperature of the battery pack.

[0119] Among them, the current battery cell temperature can be the currently collected average battery cell temperature. For example, if the battery pack includes 4 single battery cells, the current temperatures of the 4 single battery cells can be collected separately, and the current temperatures of the 4 single battery cells are averaged to obtain the current battery cell temperature of the corresponding battery pack.

[0120] Step S720, controlling the atomization module to operate according to the preset battery core temperature and the current battery core temperature, so that the atomization module atomizes at least a portion of the first liquid immersion liquid transmitted by the transmission component to obtain a mist-like immersion liquid.

[0121] The processing module can compare the preset battery cell temperature and the current battery cell temperature, and control the operation of the transmission component based on the comparison result, so that the transmission component can extract at least part of the first liquid immersion liquid and transmit it to the atomization module, so that the atomization module can atomize the corresponding first liquid immersion liquid, and then generate mist-like immersion liquid in the atomization chamber to increase the total surface area of ​​all immersion liquids, that is, through a certain content of immersion liquid, the contact area between the immersion liquid and the battery pack can be increased.

[0122] Step S730: regulating the temperature of the battery pack according to the first liquid immersion liquid and the mist immersion liquid.

[0123] For example, the processing module can control the liquid flow rate and liquid height of the first liquid immersion liquid and the phase change temperature of the mist immersion liquid to regulate the temperature of the battery pack and implement thermal management of the battery system, so that the battery system can maintain operation within a normal temperature range and improve the service life of the battery system.

[0124] In the above embodiment, at least a portion of the first liquid immersion liquid is transmitted for atomization to obtain a mist immersion liquid, and the temperature of the battery pack is adjusted according to the first liquid immersion liquid and the mist immersion liquid in the accommodating chamber, thereby improving the temperature uniformity and heat dissipation effect of the battery system, while reducing the liquid cooling cost and improving the weight energy density of the battery system.

[0125] In one embodiment, if Figure 8 As shown, a temperature adjustment method is also provided, which is applied to the above-mentioned battery system and includes the following steps:

[0126] Step S810, obtaining the current cell temperature of the battery pack.

[0127] For the specific description of the above step S810, please refer to the description of the above embodiment, which will not be repeated here.

[0128] Step S820: adjusting the liquid height and / or liquid flow rate of the first liquid immersion liquid according to the preset battery core temperature and the current battery core temperature.

[0129] For example, the processing module can compare the preset battery cell temperature and the current battery cell temperature. When the current battery cell temperature does not reach the preset battery cell temperature, the liquid height or liquid flow rate of the first liquid immersion liquid can be adjusted until the current battery cell temperature reaches the preset battery cell temperature to regulate the temperature of the battery system.

[0130] For another example, the processing module can compare the preset battery cell temperature and the current battery cell temperature. When the current battery cell temperature does not reach the preset battery cell temperature, the liquid height and liquid flow rate of the first liquid immersion liquid can be synchronously adjusted until the current battery cell temperature reaches the preset battery cell temperature, so as to improve the temperature regulation efficiency of the battery system.

[0131] Step S830, controlling the atomization module to operate according to the preset battery core temperature and the current battery core temperature, so that the atomization module atomizes at least a portion of the first liquid immersion liquid transmitted by the transmission component to obtain a mist-like immersion liquid.

[0132] For the specific description of the above step S830, please refer to the description of the above embodiment, which will not be repeated here.

[0133] Step S840: regulating the temperature of the battery pack according to the first liquid immersion liquid and the mist immersion liquid.

[0134] For the specific description of the above-mentioned step S840, please refer to the description of the above-mentioned embodiment, which will not be repeated here.

[0135] In the above embodiment, the liquid height and / or liquid flow rate of the first liquid immersion liquid is adjusted, at least a portion of the first liquid immersion liquid is transmitted for atomization, and thus a mist immersion liquid is obtained, and the temperature of the battery pack is adjusted according to the first liquid immersion liquid and the mist immersion liquid in the accommodating cavity, thereby greatly improving the temperature uniformity and heat dissipation effect of the battery system, while reducing the liquid cooling cost and improving the weight energy density of the battery system.

[0136] In one embodiment, Fig. 9 As shown, the step of adjusting the liquid height of the first liquid immersion liquid according to the preset battery core temperature and the current battery core temperature includes:

[0137] Step S910, when the height of the first liquid immersion liquid is less than the height of the battery pack, query the temperature and height mapping relationship according to the preset battery cell temperature to obtain the target liquid height corresponding to the first liquid immersion liquid.

[0138] Step S920: adjusting the liquid height of the first liquid immersion liquid according to the target liquid height.

[0139] Among them, the mapping relationship between temperature and altitude is established through historical test data.

[0140] For example, the processing module can compare the current battery cell temperature with the preset battery cell temperature, and adjust the liquid height of the first liquid immersion liquid according to the processing result. Exemplarily, when the height of the first liquid immersion liquid is less than the height of the battery pack, the temperature and height mapping relationship is queried according to the preset battery cell temperature to obtain the target liquid height corresponding to the first liquid immersion liquid, and then the liquid height of the first liquid immersion liquid is adjusted according to the target liquid height to achieve temperature regulation of the battery system and improve the heat dissipation efficiency of the battery system.

[0141] In one embodiment, Fig.10As shown, the step of adjusting the liquid flow rate of the first liquid immersion liquid according to the preset battery core temperature and the current battery core temperature includes:

[0142] Step S110, when the height of the first liquid immersion liquid is greater than or equal to the height of the battery pack, query the temperature and flow rate mapping relationship according to the preset battery cell temperature to obtain the target liquid flow rate corresponding to the first liquid immersion liquid.

[0143] Step S120, adjusting the liquid flow rate of the first liquid immersion liquid according to the target liquid flow rate.

[0144] The mapping relationship between temperature and flow rate is established through historical test data.

[0145] For example, the processing module can also be used to compare the current battery cell temperature with the preset battery cell temperature, and adjust the liquid flow rate of the first liquid immersion liquid according to the processing result. Exemplarily, when the height of the first liquid immersion liquid is greater than or equal to the height of the battery pack, according to the preset battery cell temperature, the temperature and flow rate mapping relationship is queried to obtain the target liquid flow rate corresponding to the first liquid immersion liquid, and then according to the target liquid flow rate, the liquid flow rate of the first liquid immersion liquid is adjusted to achieve precise control of the battery pack to work in a suitable temperature range, thereby improving the heat dissipation efficiency of the battery system.

[0146] In one embodiment, the step of establishing the temperature-altitude mapping relationship includes:

[0147] Obtain the heat exchange area, characteristic length, heat absorption, heating power, liquid flow rate of the first liquid immersion liquid and the temperature difference between the battery pack and the first liquid immersion liquid based on the preset working time of the battery pack; obtain the Reynolds value according to the liquid flow rate, characteristic length and preset liquid dynamic viscosity; obtain the Nusselt value according to the Reynolds value and Prandtl constant; obtain the heat transfer coefficient according to the Nusselt value, characteristic length and preset liquid thermal conductivity; obtain the heat exchange power of the battery pack according to the heat transfer coefficient, heat exchange area and temperature difference; obtain the heat absorption power of the battery pack according to the heat absorption and the preset working time; obtain the temperature and height mapping relationship according to the heating power, heat exchange power and heat absorption power.

[0148] For example, the heat exchange area of ​​the battery pack is A, the characteristic length of the battery pack is L, the heat absorption of the battery pack is Q1, the liquid flow rate of the first liquid immersion liquid is v0, the temperature difference between the battery pack and the first liquid immersion liquid based on the preset working time is ΔT, the preset liquid dynamic viscosity is ν, the Reynolds value is Re, the Prandtl constant is Pr, the Nusselt value is Nu, the preset liquid thermal conductivity λ, the heat transfer coefficient is h, the heat exchange power is Ф, the preset working time is t, the heat absorption power is P1, and the heat generation power is P2.

[0149] Set the current cell temperature to t w, the liquid height of the first liquid immersion liquid is y, under the given battery pack charge and discharge conditions, such as 1C constant current charge and discharge; the size of the battery pack is 0.1737m*0.072m*0.2075m. Then the heat exchange area A=(0.1737m+0.072m)×2×y=0.4914y; characteristic length L=0.1737m+0.072m+y=0.2457+y, the liquid flow rate of the first liquid immersion liquid v0=0.03m / s, and then the Reynolds number is calculated Assuming the Prandtl constant to be Pr = 36.37, the Nusselt number is Heat transfer coefficient Then the heat transfer power is: The heat absorption of the battery pack is set to: Q1 = c × m × ΔT = 1055 × 5.42 × (t w -25), where c is the specific heat capacity of the battery pack and m is the mass of the battery pack.

[0150] Based on the fact that the heat generation power of the battery pack is the sum of the heat exchange power of the battery pack and the heat absorption power of the battery pack, the heat generation power P2 is set to 41.3, then P2 = P1 + Ф, that is, Then the corresponding temperature and height mapping relationship is established as By processing the current cell temperature of the battery pack and the liquid height of the first liquid immersion liquid, a curve diagram of the corresponding temperature and height mapping relationship is established (eg Fig.11 As shown), the target liquid flow rate of the first liquid immersion liquid can be obtained by querying the corresponding temperature and flow rate mapping relationship, and then the liquid flow rate of the first liquid immersion liquid can be adjusted according to the target liquid flow rate, so as to achieve precise control of the battery pack to work in a suitable temperature range, thereby improving the heat dissipation efficiency of the battery system.

[0151] In one embodiment, the step of establishing the temperature and flow rate mapping relationship includes:

[0152] Obtain the heat exchange area, characteristic length, heat absorption, heating power of the battery pack and the temperature difference between the battery pack and the first liquid immersion liquid based on the preset working time; obtain the Reynolds number including the liquid flow rate as a variable according to the characteristic length and the preset liquid dynamic viscosity; obtain the Nusselt number including the liquid flow rate as a variable according to the Reynolds number and the Prandtl constant; obtain the heat transfer coefficient including the liquid flow rate as a variable according to the Nusselt number, characteristic length and preset liquid thermal conductivity; obtain the heat transfer power including the liquid flow rate as a variable according to the heat transfer coefficient, heat exchange area and temperature difference; obtain the heat absorption power of the battery pack according to the heat absorption and the preset working time; obtain the temperature and flow rate mapping relationship according to the heating power, heat exchange power and heat absorption power.

[0153] For example, the heat exchange area of ​​the battery pack is A, the characteristic length of the battery pack is L, the heat absorption of the battery pack is Q1, the liquid flow rate of the first liquid immersion liquid is v0, the temperature difference between the battery pack and the first liquid immersion liquid based on the preset working time is ΔT, the preset liquid dynamic viscosity is ν, the Reynolds number is Re, the Prandtl constant is Pr, the Nusselt number is Nu, the preset liquid thermal conductivity is λ, the heat transfer coefficient is h, the heat exchange power is Ф, the preset working time is t, the heat absorption power is P1, and the heat generation power is P2.

[0154] Under the given battery pack charge and discharge conditions, such as 1C constant current charge and discharge, it is assumed that except for the bottom surface of the battery pack, the remaining surfaces of the battery pack are in contact with the first liquid immersion liquid. The size of the battery pack is 0.1737m*0.072m*0.2075m, and the heat exchange area A = (0.1737m+0.072m)×2×0.2075m+0.072m×0.1737m=0.1145m 2 , characteristic length L = 0.1737m + 0.072m + 0.2075m = 0.4532m; set the liquid flow rate v0 of the first liquid immersion liquid = 0.03m / s, then the Reynolds number Assuming Prandtl constant Pr = 36.37, then Nusselt number Nu = 0.664 × Re 1 / 2 ×Pr 1 / 3 =145.2, heat transfer coefficient Heat transfer power Φ=h×A×ΔT=41.65×0.1145×(t w -20)=4.77(t w -20); Assume that the battery pack is charged for 60 minutes under 1C condition, that is, t = 3600s, then the heat absorption of the battery pack is Q1 = c × m × ΔT = 1055 × 5.42 × (t w -25), the heat absorption power of the battery pack

[0155] Based on the fact that the heat generation power of the battery pack is the sum of the heat exchange power of the battery pack and the heat absorption power of the battery pack, the heat generation power P2 is set to 41.3, then P2 = P1 + Ф, that is, 41.3 = 4.77 (t w -20)+1.59(t w -25), we get t w =27.74℃. Based on the simulation results, the corresponding current cell temperature of the battery pack is 27.5℃, so the error is Therefore, when the first liquid immersion liquid exceeds the height of the battery pack, the heat exchange area A and the characteristic length L remain unchanged, and only the liquid flow rate of the first liquid immersion liquid will affect the heat exchange situation, that is, the greater the average flow rate of the first liquid immersion liquid, the greater the Reynolds number, the greater the Nusselt number, the greater the heat transfer coefficient, the greater the heat transfer power, and the enhanced heat transfer performance.

[0156] It should be understood that although Figures 7 to 10 The steps in the flowchart are shown in sequence as indicated by the arrows, but these steps are not necessarily executed in the order indicated by the arrows. Unless otherwise specified in this document, there is no strict order restriction for the execution of these steps, and these steps can be executed in other orders. Moreover, Figures 7 to 10 At least part of the steps may include multiple sub-steps or multiple stages. These sub-steps or stages are not necessarily executed at the same time, but can be executed at different times. The execution order of these sub-steps or stages is not necessarily sequential, but can be executed in turn or alternately with other steps or at least part of the sub-steps or stages of other steps.

[0157] In one embodiment, a computer-readable storage medium is further provided, on which a computer program is stored. When the computer program is executed by a processor, the steps of any one of the above-mentioned temperature adjustment methods are implemented.

[0158] For example, a computer program, when executed by a processor, performs the following steps:

[0159] Acquire the current cell temperature of the battery pack; control the atomization module and the transmission component to work according to the preset cell temperature and the current cell temperature, so that the transmission component transmits at least part of the first liquid immersion liquid in the accommodating chamber, and the atomization module atomizes at least part of the first liquid immersion liquid transmitted by the transmission component to obtain a mist immersion liquid; adjust the temperature of the battery pack according to the first liquid immersion liquid and the mist immersion liquid.

[0160] Those of ordinary skill in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be implemented by instructing related hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned division operation methods. Among them, any reference to memory, storage, database or other media used in the embodiments provided in this application may include non-volatile and / or volatile memory. Non-volatile memory may include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM) or flash memory. Volatile memory may include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in many forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link (Synchlink) DRAM (SLDRAM), memory bus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM), etc.

[0161] The technical features of the above embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0162] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A battery temperature regulating device, characterized in that: include: A box body, wherein the box body is provided with a receiving cavity, an atomizing cavity is provided on the receiving cavity, the receiving cavity and the atomizing cavity are communicated, and the receiving cavity is used to receive a battery pack and a first liquid immersion liquid; a transmission component, the transmission component being in communication with the accommodating chamber, the transmission component being used to transmit at least a portion of the first liquid immersion liquid in the accommodating chamber; An atomization module is connected to the transmission component and the atomization chamber, and is used to atomize at least part of the first liquid immersion liquid transmitted by the transmission component to obtain a mist-like immersion liquid.

2. The battery temperature regulating device according to claim 1, characterized in that: It also includes a processing module, which is connected to the atomization module and the transmission component. The processing module is configured to obtain the current battery cell temperature of the battery pack, and control the atomization module and the transmission component to work according to the preset battery cell temperature and the current battery cell temperature to adjust the temperature of the battery pack.

3. The battery temperature regulating device according to claim 2, characterized in that: The processing module is further configured to adjust the liquid height and / or liquid flow rate of the first liquid immersion liquid according to a preset battery core temperature and the current battery core temperature.

4. The battery temperature regulating device according to claim 2, characterized in that: Also includes a fan module; The fan module is in communication with the atomizing chamber, the fan module is connected to the processing module, and the fan module is used for dispersing and transmitting the mist-like immersion liquid to the atomizing chamber.

5. The battery temperature regulating device according to claim 4, characterized in that: The processing module is also configured to obtain the current immersion liquid phase change temperature, and adjust the output power of the fan module and / or the output power of the atomization module according to the preset immersion liquid phase change temperature and the current immersion liquid phase change temperature; the preset immersion liquid phase change temperature is 30°C to 45°C.

6. The battery temperature regulating device according to claim 2, characterized in that: It also includes a partition plate, which is arranged between the accommodating chamber and the atomizing chamber; The partition is provided with a through hole group, and the through hole group is connected with the accommodating cavity and the atomizing cavity respectively.

7. The battery temperature regulating device according to claim 6, characterized in that: The partition includes at least two plate surface areas corresponding to different battery core temperatures, and the through hole group includes at least two through holes; the plate surface area is provided with a plurality of through holes; The total area of ​​the through holes in the board area corresponding to the high temperature of the battery cell is greater than the total area of ​​the through holes in the temperature area corresponding to the low temperature of the battery cell.

8. The battery temperature regulating device according to claim 7, characterized in that: The number of through holes in the board area corresponding to the high battery cell temperature is greater than the number of through holes in the temperature area corresponding to the low battery cell temperature; and / or the diameter of the through holes in the board area corresponding to the high battery cell temperature is greater than the diameter of the through holes in the temperature area corresponding to the low battery cell temperature.

9. The battery temperature regulating device according to claim 6, characterized in that: The through hole group is used to transfer the mist immersion liquid in the atomization chamber to the accommodating chamber, so that at least part of the mist immersion liquid in the accommodating chamber contacts the battery pack, so that the corresponding part of the mist immersion liquid changes phase to obtain gaseous immersion liquid; and / or, At least part of the mist immersion liquid in the accommodating chamber contacts and flows through the battery pack before entering the first liquid immersion liquid in the accommodating chamber.

10. The battery temperature regulating device according to claim 9, characterized in that: At least part of the gaseous immersion liquid in the accommodating chamber rises to the top surface of the accommodating chamber, causing a corresponding part of the gaseous immersion liquid to change phase to obtain a second liquid immersion liquid, and at least part of the second liquid immersion liquid falls back and contacts the battery pack to regulate the temperature of the battery pack.

11. The battery temperature regulating device according to any one of claims 1 to 10, characterized in that: The box body is provided with a first interface and a second interface, and the first interface and the second interface are arranged close to the bottom surface of the accommodating cavity; The first interface and the second interface are in communication with the accommodating cavity.

12. The battery temperature regulating device according to any one of claims 1 to 10, characterized in that: The liquid height of the first liquid immersion liquid is 20 mm to 500 mm; and / or, the liquid flow rate of the first liquid immersion liquid is 0.1 L / min to 15 L / min; And / or, the first liquid immersion liquid has a liquid temperature of 10°C to 38°C.

13. A battery system, characterized in that: The invention comprises a battery pack and a battery temperature regulating device as claimed in any one of claims 1 to 12, wherein the battery pack is arranged in the battery temperature regulating device.

14. A temperature adjustment method, characterized in that: The battery system according to claim 13 comprises the following steps: Get the current cell temperature of the battery pack; According to the preset battery core temperature and the current battery core temperature, controlling the atomization module to operate so that the atomization module atomizes at least a portion of the first liquid immersion liquid transmitted by the transmission component to obtain a mist immersion liquid; The battery pack is temperature regulated based on the first liquid immersion fluid and the mist immersion fluid.

15. The temperature adjustment method according to claim 14, characterized in that: The step of obtaining the current battery cell temperature of the battery pack further includes: The liquid height and / or liquid flow rate of the first liquid immersion liquid is adjusted according to the preset battery core temperature and the current battery core temperature.

16. The temperature adjustment method according to claim 15, characterized in that: The step of adjusting the liquid height of the first liquid immersion liquid according to the preset battery core temperature and the current battery core temperature comprises: When the height of the first liquid immersion liquid is less than the height of the battery pack, querying a temperature-height mapping relationship according to the preset battery cell temperature to obtain a target liquid height corresponding to the first liquid immersion liquid; The liquid height of the first liquid immersion liquid is adjusted according to the target liquid height.

17. The temperature adjustment method according to claim 16, characterized in that: The step of establishing the temperature and height mapping relationship includes: Obtaining a heat exchange area, a characteristic length, a heat absorption amount, a heat generation power, a liquid flow rate of the first liquid immersion liquid, and a temperature difference between the battery pack and the first liquid immersion liquid based on a preset working time of the battery pack; According to the liquid flow rate, the characteristic length and the preset liquid dynamic viscosity; obtaining the Reynolds value; According to the Reynolds number and the Prandtl constant, the Nusselt number is obtained; According to the Nusselt value, the characteristic length and the preset liquid thermal conductivity; obtaining a heat transfer coefficient; Obtaining a heat exchange power of the battery pack according to the heat exchange coefficient, the heat exchange area and the temperature difference; Obtaining heat absorption power of the battery pack according to the heat absorption amount and the preset working time; The temperature and height mapping relationship is obtained according to the heating power, the heat exchange power and the heat absorption power.

18. The temperature adjustment method according to claim 15, characterized in that: The step of adjusting the liquid flow rate of the first liquid immersion liquid according to the preset battery core temperature and the current battery core temperature comprises: When the height of the first liquid immersion liquid is greater than or equal to the height of the battery pack, querying a mapping relationship between temperature and flow rate according to the preset battery cell temperature to obtain a target liquid flow rate corresponding to the first liquid immersion liquid; The liquid flow rate of the first liquid immersion liquid is adjusted according to the target liquid flow rate.

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