Control method of immersion liquid cooling unit, electronic device and computer readable medium

Abstract

The present invention discloses a control method for an immersion liquid cooling unit, which relates to the field of liquid cooling technology. The method comprises: obtaining battery data of the battery, wherein the battery data comprises current battery temperature, preset battery temperature, current battery state of charge value and current battery charge and discharge state; determining the operation mode of the liquid cooling unit based on the current battery temperature and the preset battery temperature, wherein the mode comprises a heating mode and a cooling mode; determining the control rule of the liquid cooling unit under the operation mode from a preset first control rule and a preset second control rule based on the charge and discharge state of the battery, and controlling the current target operation power of the liquid cooling unit according to the control rule and the current battery state of charge value. The present invention accurately controls the power consumption of the liquid cooling unit.

Description

Technical Field

[0001] The present invention relates to the field of liquid cooling technology, and in particular to a control method, electronic equipment and computer-readable medium for an immersion liquid cooling unit. Background Art

[0002] The heat dissipation of energy storage batteries usually adopts cold plate heat exchange, that is, the liquid cooling plate and the battery are encapsulated together in the battery box, and the liquid cooling unit provides a cold source for the liquid cooling plate, and the heat generated by the battery is taken away through the ethylene glycol aqueous solution flowing in the liquid cooling plate. Immersed energy storage batteries, that is, the battery and the coolant are encapsulated together in the battery box, and the battery is immersed in the coolant, and the liquid cooling unit provides a cold source for the coolant. However, the fixed frequency control of the existing liquid cooling unit is not suitable for immersed energy storage batteries, and there is a risk of thermal runaway. Summary of the invention

[0003] The present invention aims to solve one of the technical problems in the related art to a certain extent. To this end, the present invention provides a control method of an immersion liquid cooling unit, an electronic device and a computer-readable medium, which are suitable for the cooling requirements of batteries at different battery state of charge values, more accurately control the power consumption of the liquid cooling unit, and take into account the cooling and heating requirements of the coolant.

[0004] In order to achieve the above object, a first aspect of the present invention provides a control method for an immersion liquid cooling unit, the method comprising the following steps:

[0005] Acquire battery data of the battery, the battery data including current battery temperature, preset battery temperature, current battery state of charge value and current battery charge and discharge state;

[0006] Determining an operating mode of the liquid cooling unit based on the current battery temperature and the preset battery temperature, the mode including a heating mode and a cooling mode;

[0007] Based on the charge and discharge status of the battery, the control rule of the liquid cooling unit in the operating mode is determined from a preset first control rule and a preset second control rule, and the current target operating power of the liquid cooling unit is controlled according to the control rule and the current battery charge status value.

[0008] Optionally, based on the charge and discharge state of the battery, determining a control rule of the liquid cooling unit in the operation mode from a preset first control rule and a preset second control rule, and controlling the current target operating power of the liquid cooling unit according to the control rule and the current battery state of charge value, includes:

[0009] The first control rule is selected when the battery is in a charging state, wherein the preset first control rule includes a one-to-one correspondence between a plurality of charge state value intervals of the rechargeable battery and a plurality of preset charging frequency conversion coefficients;

[0010] Determine the range of charge state values ​​of the rechargeable battery that matches the current battery charge state value, multiply the corresponding preset charging frequency coefficient by the operating power of the liquid cooling unit under the target mode to obtain the current target operating power of the liquid cooling unit under the target mode, and control the liquid cooling unit to operate at the current target operating power.

[0011] Optionally, the preset first control rule includes a one-to-one correspondence between three charge state value intervals of the rechargeable battery and three preset charging frequency conversion coefficients, the three charge state value intervals of the rechargeable battery are continuous and uninterrupted, and the three preset charging frequency conversion coefficients are K1, 1 and K2 respectively;

[0012] In the cooling mode, the calculation formula of the current target operating power of the liquid cooling unit is as follows:

[0013] P AC =K1*P ac (1)

[0014] P AC =P ac (2)

[0015] P AC =K2*P ac (3)

[0016] In formulas (1), (2), and (3), P AC represents the current target operating power of the liquid cooling unit in the cooling mode, P ac Indicates the operating power of the liquid cooling unit in the cooling mode;

[0017] In the heating mode, the calculation formula of the current target operating power of the liquid cooling unit is as follows:

[0018] P AH =K1*P ah (4)

[0019] P AH =P ah (5)

[0020] P AH =K2*P ah (6)

[0021] In formulas (4), (5), and (6), P AHrepresents the current target operating power of the liquid cooling unit in the heating mode, P ah Indicates the operating power of the liquid cooling unit in the heating mode.

[0022] Optionally, in the heating mode, the operating power P of the liquid cooling unit ah The calculation formula is as follows:

[0023] P ah =γP S +P y2 (13)

[0024] P s =ΔTQS (14)

[0025]

[0026] In the above formula, P S It represents the heat that seeps out from the inside of the battery box, γ represents the correction coefficient, ΔT is the temperature difference between the inside and outside of the battery box, S is the heat dissipation area of ​​the battery box, and Q is the heat transfer coefficient of the heat dissipation material of the battery box;

[0027] P y2 Indicates the heat absorbed by the coolant, T i Indicates the preset battery temperature, T y2 is the coolant temperature before heating, ρ is the density of the coolant, C is the specific heat capacity of the coolant, M is the mass of the coolant, and t is the cooling time.

[0028] Optionally, based on the charge and discharge state of the battery, determining a control rule of the liquid cooling unit in the operating mode from a preset first control rule and a preset second control rule, and controlling the current target operating power of the liquid cooling unit according to the control rule and the current battery state of charge value, the liquid cooling unit includes:

[0029] When the battery is in a discharging state, the second control rule is selected, wherein the preset second control rule includes a one-to-one correspondence between a plurality of discharging battery state of charge value intervals and a plurality of preset discharging frequency conversion coefficients;

[0030] Determine a value range of the discharge battery state of charge value that matches the current battery state of charge value, multiply the operating power of the liquid cooling unit under the target mode by the corresponding preset discharge frequency coefficient to obtain the current target operating power of the liquid cooling unit, and control the liquid cooling unit to operate at the current target operating power.

[0031] Optionally, the preset first control rule includes a one-to-one correspondence between three charging state value intervals of the rechargeable battery and three preset charging frequency conversion coefficients, the three charging state value intervals of the rechargeable battery are continuous and uninterrupted, and the three preset charging frequency conversion coefficients are K3, 1 and K4 respectively;

[0032] In the cooling mode, the calculation formula of the current target operating power of the liquid cooling unit is as follows:

[0033] P AC =K3*P ac (7)

[0034] P AC =P ac (8)

[0035] P AC =K4*P ac (9)

[0036] In formulas (7), (8), and (9), P AC represents the current target operating power of the liquid cooling unit in the cooling mode, P ac Indicates the operating power of the liquid cooling unit in the cooling mode;

[0037] In the heating mode, the calculation formula of the current target operating power of the liquid cooling unit is as follows:

[0038] P AH =K3*P ah (10)

[0039] P AH =P ah (11)

[0040] P AH =K4*P ah (12)

[0041] In formulas (10), (11), and (12), P AH represents the current target operating power of the liquid cooling unit in the cooling mode, P ah Indicates the operating power of the liquid cooling unit in the cooling mode.

[0042] Optionally, in the cooling mode, the operating power P of the liquid cooling unit ac The calculation formula is as follows:

[0043] P ac =γP S +XP R +P y1 (16)

[0044] P s =ΔTQS (17)

[0045] P R =XI 2 R (18)

[0046]

[0047] In the above formula, P S represents the heat penetrating into the battery box from the outside, γ represents the correction coefficient, ΔT is the temperature difference between the inside and outside of the battery box, S is the heat dissipation area, and Q is the heat transfer coefficient of the heat dissipation material of the battery box;

[0048] P R Indicates the calorific value of the battery cell, X is the total number of battery cells, I is the discharge current of the battery cell, and R is the internal resistance of the battery cell;

[0049] P y1 Indicates the heat absorbed by the coolant, T y1 is the coolant temperature before refrigeration, ρ is the density of the coolant, C is the specific heat capacity of the coolant, M is the mass of the coolant, and t is the refrigeration time.

[0050] Optionally, it is characterized in that the determining the operation mode of the liquid cooling unit based on the current battery temperature and the preset battery temperature includes:

[0051] In response to the current battery temperature being less than the preset battery temperature, determining that the operation mode of the liquid cooling unit is a heating mode;

[0052] In response to the current battery temperature being greater than or equal to the preset battery temperature, determining that the operation mode of the liquid cooling unit is a cooling mode.

[0053] A second aspect of the present invention provides an electronic device, the electronic device comprising:

[0054] one or more processors;

[0055] A memory having one or more computer programs stored thereon, when the one or more computer programs are executed by the one or more processors, the one or more processors implement the control method of the liquid cooling unit provided by the first aspect of the present invention.

[0056] The third aspect of the present invention provides a computer-readable medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the control method of the liquid cooling unit provided by the first aspect of the present invention.

[0057] These features and advantages of the present invention will be disclosed in detail in the following specific embodiments and drawings. The best embodiments or means of the present invention will be described in detail in conjunction with the drawings, but they are not intended to limit the technical solutions of the present invention. In addition, there are multiple features, elements, and components that appear in each of the following texts and drawings, and different symbols or numbers are marked for convenience, but they all represent components with the same or similar structures or functions. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] The present invention will be further described below in conjunction with the accompanying drawings:

[0059] Figure 1 The figure is a flow chart of the control method of the immersion liquid cooling unit of the present invention.

[0060] Figure 2 This is a heating power-SOC curve diagram of the present invention.

[0061] Figure 3 It is a schematic diagram of the structure of the electronic device of the present invention.

[0062] Figure 4 It is a schematic diagram of the structure of the computer readable medium of the present invention.

[0063] Among them, 101 is a processor; 102 is a memory; 103 is an I / O interface; 104 is a bus. DETAILED DESCRIPTION

[0064] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The embodiments in the implementation manner are intended to be used to explain the present invention and should not be construed as limiting the present invention.

[0065] References in this specification to "one embodiment" or "an example" or "an example" mean that a particular feature, structure, or characteristic described in conjunction with the embodiment itself may be included in at least one embodiment of the present patent disclosure. The appearance of the phrase "in one embodiment" in various places in the specification does not necessarily refer to the same embodiment.

[0066] In the related technologies, the cooling source of the liquid cooling unit is mostly operated at a fixed frequency, and the effect of external temperature on the heat dissipation of the energy storage battery is almost never considered. Secondly, the effect of the battery SOC (State of Charge, also known as the remaining power, the SOC value refers to a percentage of the energy stored in the battery, usually expressed in the range of 0% to 100%) on the heat generation of the battery is not considered. The heat generated by the battery varies with the SOC value. If the liquid cooling unit is in fixed frequency operation, the battery's charge and discharge states are different, and the SOC value generates different heat, but if the cooling capacity of the liquid cooling unit is the same, it will cause a large range of battery temperature changes, which poses a greater risk to battery life and thermal management.

[0067] After collecting multiple sets of historical data on battery heating power and its corresponding battery SOC value under charging and discharging conditions, the following equation is established by fitting: Figure 2 The heating power-SOC curve shown (the fitting method can be adopted, and the polyfit function is used in Matlab to fit the curve of multiple sets of data). It can be seen from the temperature-SOC curve that the relationship between the heating power and the SOC value of the battery is not linear, and can be roughly divided into three stages, namely the first change interval, the second change interval and the third change interval. The first change interval and the third change interval are linearly related, and the second change interval is relatively stable.

[0068] In view of this, the first embodiment of the present invention provides an immersion liquid cooling unit control method, the immersion liquid cooling unit includes a battery box, a battery, a coolant and a liquid cooling unit, the battery and the coolant are jointly packaged in the battery box, and the battery is at least partially immersed in the coolant, and the liquid cooling unit is used to provide a cold source for the battery box.

[0069] like Figure 1 As shown, the method comprises the following steps:

[0070] In step S100, battery data of the battery is obtained, wherein the battery data includes a current battery temperature, a preset battery temperature, a current battery state of charge value, and a current battery charge and discharge state;

[0071] Among them, this embodiment detects the battery data of the battery through the BMS (Battery Management System). The BMS is a device that cooperates with monitoring the status of the energy storage battery. It is mainly for intelligent management and maintenance of each battery unit, preventing the battery from overcharging and over-discharging, extending the service life of the battery, and monitoring the status of the battery. The present invention has no special restrictions on the BMS, and a conventional BMS familiar to those skilled in the art can be used. The present invention controls the power of the liquid cooling unit by real-time detection of the battery temperature and SOC through the BMS, so that the power of the liquid cooling unit can change the frequency of the power as the SOC value changes.

[0072] In step S200, the operation mode of the liquid cooling unit is determined based on the current battery temperature and the preset battery temperature, and the mode includes a heating mode and a cooling mode;

[0073] In step S210, in response to the current battery temperature being lower than the preset battery temperature, determining that the operation mode of the liquid cooling unit is a heating mode;

[0074] In step S211 , in response to the current battery temperature being greater than or equal to the preset battery temperature, it is determined that the operation mode of the liquid cooling unit is a cooling mode.

[0075] It should be noted that in heating mode, the heat seeping out of the battery box needs to be considered, and the operating power of the liquid cooling unit should be the sum of the heat seeping out of the battery box and the heating amount of the coolant; in cooling mode, the heat seeping in from the outside of the battery box is required, and the operating power of the liquid cooling unit should be the sum of the heat seeping in from the outside of the battery box, the heat generated by the battery, and the cooling amount of the coolant. Considering that different energy storage batteries have different insulation levels or different materials, a correction factor Y is introduced.

[0076] In the heating mode, the heat seeping out from the inside in winter is taken into consideration. The battery is immersed in cooling oil. Before operation, the temperature of the battery is consistent with that of the cooling oil. When the battery needs to be heated to T i When the ideal thermal equilibrium state is reached, the cooling oil temperature should also be T i , the operating power P of the liquid cooling unit ah The calculation formula is as follows:

[0077] P ah =γP S +P y2 (13)

[0078] P s =ΔTQS (14)

[0079]

[0080] In the above formula, P S It represents the heat that seeps out from the inside of the battery box, γ represents the correction coefficient, ΔT is the temperature difference between the inside and outside of the battery box, S is the heat dissipation area of ​​the battery box, and Q is the heat transfer coefficient of the heat dissipation material of the battery box;

[0081] P y2 Indicates the heat absorbed by the coolant, T i Indicates the preset battery temperature, T y2 is the coolant temperature before heating, ρ is the density of the coolant, C is the specific heat capacity of the coolant, M is the mass of the coolant, and t is the cooling time.

[0082] In the cooling mode, the operating power P of the liquid cooling unit ac The calculation formula is as follows:

[0083] P ac =γP S +XP R +P y1 (16)

[0084] P s =ΔTQS (17)

[0085] P R =XI 2 R (18)

[0086]

[0087] In the above formula, P S represents the heat penetrating into the battery box from the outside, γ represents the correction coefficient, ΔT is the temperature difference between the inside and outside of the battery box, S is the heat dissipation area, and Q is the heat transfer coefficient of the heat dissipation material of the battery box;

[0088] P R Indicates the calorific value of the battery cell, X is the total number of battery cells, I is the discharge current of the battery cell, and R is the internal resistance of the battery cell;

[0089] P y1 Indicates the heat absorbed by the coolant, T y1 is the coolant temperature before refrigeration, ρ is the density of the coolant, C is the specific heat capacity of the coolant, M is the mass of the coolant, and t is the refrigeration time.

[0090] The present invention introduces the influence of the ambient temperature on the energy storage system, avoiding the situation where only the heat generated by the battery is considered, resulting in insufficient cooling and heating power of the liquid cooling unit, thereby causing thermal runaway of the battery.

[0091] In step S300, based on the charge and discharge status of the battery, the control rule of the liquid cooling unit in the operating mode is determined from a preset first control rule and a preset second control rule, and according to the control rule and the current battery charge status value, the current target operating power of the liquid cooling unit is controlled, wherein the control rule includes a preset first control rule and a preset second control rule.

[0092] In step S310, the first control rule is selected in the charging state, and the preset first control rule includes a one-to-one correspondence between a plurality of charge state value intervals of the rechargeable battery and a plurality of preset charging frequency conversion coefficients;

[0093] Determine the range of charge state values ​​of the rechargeable battery that matches the current battery charge state value, multiply the corresponding preset charging frequency coefficient by the operating power of the liquid cooling unit under the target mode to obtain the current target operating power of the liquid cooling unit under the target mode, and control the liquid cooling unit to operate at the current target operating power.

[0094] In step S320, based on the charge and discharge state of the battery, a control rule of the liquid cooling unit in the operation mode is determined from a preset first control rule and a preset second control rule, and the current target operating power of the liquid cooling unit is controlled according to the control rule and the current battery state of charge value, including:

[0095] When the battery is in a discharging state, the second control rule is selected, wherein the preset second control rule includes a one-to-one correspondence between a plurality of discharging battery state of charge value intervals and a plurality of preset discharging frequency conversion coefficients;

[0096] Determine a value range of the discharge battery state of charge value that matches the current battery state of charge value, multiply the operating power of the liquid cooling unit under the target mode by the corresponding preset discharge frequency coefficient to obtain the current target operating power of the liquid cooling unit, and control the liquid cooling unit to operate at the current target operating power.

[0097] Specifically, after collecting multiple sets of historical data of battery heating power and its corresponding battery SOC value under charging and discharging conditions, the following is established by fitting: Figure 2The heating power-SOC curve shown (the fitting method can use the polyfit function in Matlab to fit the curve of multiple sets of data). It can be seen from the temperature-SOC curve that the relationship between the heating power and the SOC value of the battery is not linear, and can be divided into three stages, namely the first change interval, the second change interval and the third change interval; when charging, the first change interval and the third change interval can be approximately regarded as a linear function, the first change interval is equivalent to the coefficient K1 of the linear function, and the third change interval is equivalent to the coefficient K2 of the linear function; similarly, when discharging, the first change interval and the third change interval can be approximately regarded as a linear function, the first change interval is equivalent to the coefficient K3 of the linear function, and the third change interval is equivalent to the coefficient K4 of the linear function; the second change interval is a relatively stable interval during charging and discharging.

[0098] In an achievable manner of the present invention, the preset first control rule includes a one-to-one correspondence between three charging battery state of charge value intervals and three preset charging frequency conversion coefficients. The three charging battery state of charge value intervals are continuous and uninterrupted, namely, the first charging battery state of charge value interval a={x|x≥6%}, the second charging battery state of charge value interval b=

[0099] {x|96%>x>6%}, and the third rechargeable battery state of charge value interval c={x|x≥96%}; the three preset charging frequency conversion coefficients are K1, 1 and K2 respectively;

[0100] In the cooling mode, the calculation formula of the current target operating power of the liquid cooling unit is as follows:

[0101] P AC =K1*P ac (1)

[0102] P AC =P ac (2)

[0103] P AC =K2*P ac (3)

[0104] In the above formula, the P AC represents the current target operating power of the liquid cooling unit in the cooling mode, P ac represents the operating power of the liquid cooling unit in the cooling mode, P AC With P ac is negatively correlated, that is, in the first charging battery state of charge value range, the larger the battery state of charge value, the lower the battery heating power; P AC With P acis positively correlated, that is, in the third rechargeable battery state of charge value range, the larger the battery state of charge value, the higher the battery heating power. The values ​​of K1 and K2 can be based on the following: Figure 2 The heating power-SOC curve shown is used for determination.

[0105] In the heating mode, the calculation formula of the current target operating power of the liquid cooling unit is as follows:

[0106] P AH =K1*P ah (4)

[0107] P AH =P ah (5)

[0108] P AH =K2*P ah (6)

[0109] In the above formula, the P AC represents the current target operating power of the liquid cooling unit in the cooling mode, P ac represents the operating power of the liquid cooling unit in the cooling mode, P AH With P ah That is to say, in the first charging battery state of charge value range, the larger the battery state of charge value, the lower the battery heating power; P AH With P ah is positively correlated, that is, in the third rechargeable battery state of charge value range, the larger the battery state of charge value, the higher the battery heating power. The values ​​of K1 and K2 can be based on the following: Figure 2 The heating power-SOC curve shown is used for determination.

[0110] In an achievable manner of the present invention, the preset first control rule includes a one-to-one correspondence between three charging battery state of charge value intervals and three preset charging frequency conversion coefficients. The three discharge battery state of charge value intervals are continuous and uninterrupted, namely, the first discharge battery state of charge value interval d = {x|x≥5%}, the second discharge battery state of charge value interval e = {x|93%>x>5%}, and the third discharge battery state of charge value interval f = {x|x≥93%}; the three preset charging frequency conversion coefficients are K3, 1 and K4 respectively;

[0111] In the cooling mode, the calculation formula of the current target operating power of the liquid cooling unit is as follows:

[0112] P AC =K3*P ac (7)

[0113] P AC =P ac (8)

[0114] P AC =K4*P ac (9)

[0115] In the above formula, the P AC represents the current target operating power of the liquid cooling unit in the cooling mode, P ac represents the operating power of the liquid cooling unit in the cooling mode, P AC With P ac is negatively correlated, that is, in the first discharge battery state of charge value range, the larger the battery state of charge value, the lower the battery heating power; P AC With P ac is negatively correlated. In the third discharge battery state of charge value range, the larger the battery state of charge value, the lower the battery heating power; the values ​​of K3 and K4 can be based on the following: Figure 2 The heating power-SOC curve shown is used for determination.

[0116] In the heating mode, the calculation formula of the current target operating power of the liquid cooling unit is as follows:

[0117] P AH =K3*P ah (10)

[0118] P AH =P ah (11)

[0119] P AH =K4*P ah (12)

[0120] In the above formula, the P AC represents the current target operating power of the liquid cooling unit in the cooling mode, P ac represents the operating power of the liquid cooling unit in the cooling mode, P AH With P ah is negatively correlated, that is, in the first discharge battery state of charge value range, the larger the battery state of charge value, the lower the battery heating power; P AC With P ac In the third discharge battery state of charge value range, the larger the battery state of charge value, the lower the battery heating power; the values ​​of K3 and K4 can be based on the following: Figure 2 The heating power-SOC curve shown is used for determination.

[0121] The present invention divides the control of the liquid cooling unit into 6 intervals, which are suitable for the cooling or heating needs of the battery under different SOC values. While accurately controlling the power consumption of the liquid cooling unit, a new variable frequency control method is provided for the immersion temperature controlled liquid cooling unit. It should be noted that the intervals can also be further subdivided according to the heating power-SOC curve to more accurately control the power consumption of the liquid cooling unit.

[0122] A second aspect of the present invention provides an electronic device, such as Figure 3 As shown, the electronic device includes: one or more processors 101; a memory 102, on which one or more computer programs are stored. When the one or more computer programs are executed by the one or more processors 101, the one or more processors 101 implement the control method provided by the first aspect of the present invention.

[0123] The control module may further include one or more I / O interfaces 103 connected between the processor 101 and the memory 102 and configured to implement information interaction between the processor 101 and the memory 102 .

[0124] Among them, the processor 101 is a device with data processing capabilities, including but not limited to the central processing unit 101 (CPU), etc.; the memory 102 is a device with data storage capabilities, including but not limited to random access memory 102 (RAM, more specifically such as SDRAM, DDR, etc.), read-only memory 102 (ROM), electrically erasable programmable read-only memory 102 (EEPROM), flash memory (FLASH); the I / O interface 103 (read-write interface) is connected between the processor 101 and the memory 102, and can realize information interaction between the processor 101 and the memory 102, including but not limited to the data bus 104 (Bus), etc.

[0125] In some embodiments, the processor 101, the memory 102, and the I / O interface 103 are connected to each other via a bus 104, and further connected to other components of the control module.

[0126] A third aspect of the present invention is as follows Figure 4 As shown, a computer readable medium is provided, on which a computer program is stored, characterized in that when the computer program is executed by the processor 101, the control method of the liquid cooling unit provided by the first aspect of the present invention is implemented.

[0127] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that the present invention includes but is not limited to the contents described in the drawings and the above specific embodiments. Any modification that does not deviate from the functional and structural principles of the present invention will be included in the scope of the claims.

Claims

1. A control method for an immersion liquid cooling unit, characterized in that: The method comprises the following steps: Acquire battery data of the battery, the battery data including current battery temperature, preset battery temperature, current battery state of charge value and current battery charge and discharge state; Determining an operating mode of the liquid cooling unit based on the current battery temperature and the preset battery temperature, the mode including a heating mode and a cooling mode; Based on the charge and discharge status of the battery, the control rule of the liquid cooling unit in the operating mode is determined from a preset first control rule and a preset second control rule, and the current target operating power of the liquid cooling unit is controlled according to the control rule and the current battery charge status value.

2. The control method of the immersion liquid cooling unit according to claim 1, characterized in that: The step of determining a control rule of the liquid cooling unit in the operation mode from a preset first control rule and a preset second control rule based on the charge and discharge state of the battery, and controlling the current target operating power of the liquid cooling unit according to the control rule and the current battery state of charge value includes: The first control rule is selected when the battery is in a charging state, wherein the preset first control rule includes a one-to-one correspondence between a plurality of charge state value intervals of the rechargeable battery and a plurality of preset charging frequency conversion coefficients; Determine the range of charge state values ​​of the rechargeable battery that matches the current battery charge state value, multiply the corresponding preset charging frequency coefficient by the operating power of the liquid cooling unit under the target mode to obtain the current target operating power of the liquid cooling unit under the target mode, and control the liquid cooling unit to operate at the current target operating power.

3. The control method of the immersion liquid cooling unit according to claim 2, characterized in that: The preset first control rule includes a one-to-one correspondence between three charging state value intervals of the rechargeable battery and three preset charging frequency conversion coefficients, the three charging state value intervals of the rechargeable battery are continuous and uninterrupted, and the three preset charging frequency conversion coefficients are K1, 1 and K2 respectively; In the cooling mode, the calculation formula of the current target operating power of the liquid cooling unit is as follows: P AC =K1*P ac (1) P AC =P ac (2) P AC =K2*P ac (3) In formulas (1), (2), and (3), P AC represents the current target operating power of the liquid cooling unit in the cooling mode, P ac Indicates the operating power of the liquid cooling unit in the cooling mode; In the heating mode, the calculation formula of the current target operating power of the liquid cooling unit is as follows: P AH =K1*P ah (4) P AH =P ah (5) P AH =K2*P ah (6) In formulas (4), (5), and (6), P AH represents the current target operating power of the liquid cooling unit in the heating mode, P ah Indicates the operating power of the liquid cooling unit in the heating mode.

4. The control method of the immersion liquid cooling unit according to claim 3, characterized in that: In the heating mode, the operating power P of the liquid cooling unit ah The calculation formula is as follows: P ah =γP S +P y2 (13) P s =ΔTQS (14) In the above formula, P S It represents the heat that seeps out from the inside of the battery box, γ represents the correction coefficient, ΔT is the temperature difference between the inside and outside of the battery box, S is the heat dissipation area of ​​the battery box, and Q is the heat transfer coefficient of the heat dissipation material of the battery box; P y2 Indicates the heat absorbed by the coolant, T i Indicates the preset battery temperature, T y2 is the coolant temperature before heating, ρ is the density of the coolant, C is the specific heat capacity of the coolant, M is the mass of the coolant, and t is the cooling time.

5. The control method of an immersion liquid cooling unit according to claim 1, characterized in that: Based on the charge and discharge state of the battery, a control rule of the liquid cooling unit in the operation mode is determined from a preset first control rule and a preset second control rule, and the current target operating power of the liquid cooling unit is controlled according to the control rule and the current battery state of charge value. The liquid cooling unit includes: When the battery is in a discharging state, the second control rule is selected, wherein the preset second control rule includes a one-to-one correspondence between a plurality of discharging battery state of charge value intervals and a plurality of preset discharging frequency conversion coefficients; Determine a value range of the discharge battery state of charge value that matches the current battery state of charge value, multiply the operating power of the liquid cooling unit under the target mode by the corresponding preset discharge frequency coefficient to obtain the current target operating power of the liquid cooling unit, and control the liquid cooling unit to operate at the current target operating power.

6. The control method of an immersion liquid cooling unit according to claim 4, characterized in that: The preset first control rule includes a one-to-one correspondence between three charging state value intervals of the rechargeable battery and three preset charging frequency conversion coefficients, the three charging state value intervals of the rechargeable battery are continuous and uninterrupted, and the three preset charging frequency conversion coefficients are K3, 1 and K4 respectively; In the cooling mode, the calculation formula of the current target operating power of the liquid cooling unit is as follows: P AC =K3*P ac (7) P AC =P ac (8) P AC =K4*P ac (9) In formulas (7), (8), and (9), P AC represents the current target operating power of the liquid cooling unit in the cooling mode, P ac Indicates the operating power of the liquid cooling unit in the cooling mode; In the heating mode, the calculation formula of the current target operating power of the liquid cooling unit is as follows: P AH =K3*P ah (10) P AH =P ah (11) P AH =K4*P ah (12) In formulas (10), (11), and (12), P AH represents the current target operating power of the liquid cooling unit in the cooling mode, P ah Indicates the operating power of the liquid cooling unit in the cooling mode.

7. The control method of the immersion liquid cooling unit according to claim 6, characterized in that: In the cooling mode, the operating power P of the liquid cooling unit ac The calculation formula is as follows: P ac =γP S +XP R +P y1 (16) P s =ΔTQS (17) P R =XI 2 R (18) In the above formula, P S represents the heat penetrating into the battery box from the outside, γ represents the correction coefficient, ΔT is the temperature difference between the inside and outside of the battery box, S is the heat dissipation area, and Q is the heat transfer coefficient of the heat dissipation material of the battery box; P R Indicates the calorific value of the battery cell, X is the total number of battery cells, I is the discharge current of the battery cell, and R is the internal resistance of the battery cell; P y1 Indicates the heat absorbed by the coolant, T y1 is the coolant temperature before refrigeration, ρ is the density of the coolant, C is the specific heat capacity of the coolant, M is the mass of the coolant, and t is the refrigeration time.

8. The control method of an immersion liquid cooling unit according to any one of claims 1 to 7, characterized in that: The determining the operation mode of the liquid cooling unit based on the current battery temperature and the preset battery temperature includes: In response to the current battery temperature being less than the preset battery temperature, determining that the operation mode of the liquid cooling unit is a heating mode; In response to the current battery temperature being greater than or equal to the preset battery temperature, determining that the operation mode of the liquid cooling unit is a cooling mode.

9. An electronic device, characterized in that: The electronic device comprises: one or more processors; A memory having one or more computer programs stored thereon, wherein when the one or more computer programs are executed by the one or more processors, the one or more processors implement the control method of the liquid cooling unit according to any one of claims 1-8.

10. A computer readable medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, a control method for a liquid cooling unit according to any one of claims 1 to 8 is implemented.

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