Power battery temperature control method and device, vehicle, electronic equipment and medium

Abstract

The invention provides a power battery temperature control method and device, a vehicle, electronic equipment and a medium, and the method comprises the steps: obtaining a charging target SOC and a battery temperature threshold value of a power battery, collecting a current battery SOC and a current battery temperature of the power battery, and a current cooling liquid temperature of a cooling liquid, the battery SOC and the battery temperature of the power battery are subjected to iterative calculation according to the collected data until the battery SOC obtained through iterative calculation reaches the charging target SOC so as to obtain the estimated battery temperature of the power battery at the end of charging, and if the estimated battery temperature is larger than a battery temperature threshold value, the cooling liquid is controlled to cool the power battery; according to the method, the battery temperature at the end of charging can be accurately pre-estimated, the overhigh battery temperature can be pre-judged in advance, the cooling liquid can be immediately triggered to cool the power battery once the overhigh battery temperature is pre-judged, the overhigh temperature of the power battery in the charging process can be effectively avoided, and the charging efficiency and safety of the power battery are ensured.

Description

Technical Field

[0001] The present application relates to the technical field of power battery thermal management, and particularly relates to a method, a device, a vehicle, an electronic device and a medium for controlling the temperature of a power battery. Background Art

[0002] With the rapid development of the new energy vehicle industry, the charging efficiency of the power battery system has become one of the key factors affecting the user experience. In order to shorten the charging time of the power battery system, fast charging technology has emerged, which can complete charging within half an hour, effectively alleviating the charging anxiety of new energy vehicle users. Since a large amount of heat is generated in the power battery during the fast charging process, it is necessary to dissipate the heat of the power battery and control its temperature rise.

[0003] At present, the thermal management strategy of the power battery system mainly relies on a liquid cooling system with limited vehicle cooling power. However, during the fast charging process, the power battery generates a high amount of heat, while the vehicle cooling power is usually limited. If the heat cannot be effectively dissipated to control the temperature of the power battery system, it may lead to too high a temperature, which in turn affects the charging rate and may even cause safety problems in severe cases. Therefore, effectively dissipating the heat of the power battery during the fast charging process under the condition of limited vehicle cooling power is an urgent problem to be solved at present. Summary of the Invention

[0004] In view of the above-mentioned disadvantages of the prior art, the present application provides a method, a device, a vehicle, an electronic device and a medium for controlling the temperature of a power battery to solve the technical problem of how to effectively dissipate the heat of the power battery during the fast charging process under the condition of limited vehicle cooling power.

[0005] The present application provides a method for controlling the temperature of a power battery, the method comprising: obtaining a charging target SOC and a battery temperature threshold of the power battery; collecting the current battery SOC and the current battery temperature of the power battery and the current coolant temperature of the coolant, and iteratively calculating the battery SOC and the battery temperature of the power battery according to the collected data until the battery SOC obtained by the iterative calculation reaches the charging target SOC, so as to obtain an estimated battery temperature of the power battery at the end of charging; comparing the estimated battery temperature with the battery temperature threshold, and if the estimated battery temperature is greater than the battery temperature threshold, controlling the coolant to cool the power battery.

[0006] In one embodiment of the present application, obtaining the battery temperature threshold of the power battery includes: obtaining the maximum charging current of the charging pile; determining, based on the charging target SOC, the allowable charging current of the charging target SOC at different battery temperatures from a preset charging Map table, where the charging Map table represents the correspondence between the battery SOC, battery temperature, and allowable charging current of the power battery; and determining the battery temperature threshold according to the maximum charging current of the charging pile and the allowable charging current of the charging target SOC at different battery temperatures.

[0007] In one embodiment of the present application, determining the battery temperature threshold according to the maximum charging current of the charging pile and the allowable charging current of the charging target SOC at different battery temperatures includes: determining the maximum value among the allowable charging currents of the charging target SOC at different battery temperatures as the initial maximum charging current under the charging target SOC; determining the minimum value between the initial maximum charging current and the maximum charging current of the charging pile as the actual maximum charging current under the charging target SOC; comparing the actual maximum charging current with the allowable charging currents of the charging target SOC at each battery temperature respectively, and selecting the largest allowable charging current from the allowable charging currents whose comparison results meet the preset conditions, so as to use the battery temperature corresponding to the largest allowable charging current as the battery temperature threshold.

[0008] In one embodiment of the present application, iteratively calculating the battery SOC and battery temperature of the power battery according to the collected data includes: matching the current battery SOC and current battery temperature with a preset charging Map table to obtain the allowable charging current corresponding to both the current battery SOC and current battery temperature as the current charging current of the power battery, where the charging Map table represents the correspondence between the battery SOC, battery temperature, and allowable charging current of the power battery; iteratively calculating the battery temperature according to a preset calculation step, current battery temperature, current charging current, and current coolant temperature to obtain the iteratively calculated battery temperature, and iteratively calculating the battery SOC according to the current charging current and the current charge capacity of the power battery to obtain the iteratively calculated battery SOC, where the current charge capacity is calculated based on the current battery SOC and the rated charge capacity of the power battery; when the iteratively calculated battery SOC reaches the charging target SOC, using the iteratively calculated battery temperature as the estimated battery temperature.

[0009] In an embodiment of the present application, controlling the coolant to cool the power battery includes: obtaining coolant temperatures with different values; calculating the heat dissipation power of the liquid cooling system of the power battery at different coolant temperatures according to the current battery temperature and the coolant temperatures with different values, and generating the corresponding relationship between the heat dissipation power and the coolant temperature; based on the preset corresponding relationship between the refrigeration power of the whole vehicle and the coolant temperature and the corresponding relationship between the heat dissipation power and the coolant temperature, determining the balance point between the refrigeration power and the heat dissipation power, and using the coolant temperature at the balance point as the target coolant temperature to control the coolant to cool the power battery according to the target coolant temperature.

[0010] In an embodiment of the present application, after controlling the coolant to cool the power battery, the method includes: re-collecting the current battery SOC and the current battery temperature of the power battery and the current coolant temperature of the coolant, and re-iteratively calculating the battery SOC and the battery temperature of the power battery according to the re-collected data until the battery SOC obtained by the re-iterative calculation reaches the charging target SOC, to obtain the new estimated battery temperature of the power battery at the end of charging; if the new estimated battery temperature is less than or equal to the battery temperature threshold, stopping the cooling of the power battery by the coolant.

[0011] In an embodiment of the present application, there is also provided a power battery temperature control device, the device includes: a data acquisition module, configured to obtain the charging target SOC and the battery temperature threshold of the power battery; collect the current battery SOC and the current battery temperature of the power battery and the current coolant temperature of the coolant; an information processing module, configured to iteratively calculate the battery SOC and the battery temperature of the power battery according to the collected data until the battery SOC obtained by the iterative calculation reaches the charging target SOC, to obtain the estimated battery temperature of the power battery at the end of charging; a comparison module, configured to compare the estimated battery temperature with the battery temperature threshold; a cooling execution module, configured to control the coolant to cool the power battery through a cooling instruction, wherein the cooling instruction is generated by the comparison result that the estimated battery temperature is greater than the battery temperature threshold.

[0012] In an embodiment of the present application, there is also provided a vehicle, the vehicle includes the power battery temperature control device as described above.

[0013] In an embodiment of the present application, there is also provided an electronic device, the electronic device includes: one or more processors; a storage device, configured to store one or more programs, when the one or more programs are executed by the one or more processors, enabling the electronic device to implement the power battery temperature control method as described above.

[0014] In an embodiment of the present application, a computer-readable storage medium is further provided, on which a computer program is stored. When the computer program is executed by a processor of a computer, the computer is enabled to execute the power battery temperature control method as described above.

[0015] Advantages of the present application: The present application provides a power battery temperature control method, device, vehicle, electronic device and medium. The method iteratively calculates the battery SOC and battery temperature according to the collected current battery SOC, current battery temperature and current coolant temperature, and can more accurately estimate the battery temperature of the power battery at the end of charging. This estimation mechanism can predict whether the temperature of the power battery will exceed the battery temperature threshold during the charging process, so as to realize the early prediction of the too high temperature of the power battery. Once it is estimated that the battery temperature is greater than the battery temperature threshold, the coolant can be immediately triggered to cool the power battery. This strategy of starting the cooling control in advance can effectively avoid the situation of too high temperature of the power battery during the actual charging process, ensure the charging efficiency, protect the power battery from high temperature damage, extend the service life of the power battery, and ensure the safety of the power battery.

[0016] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic diagram of the implementation environment of a power battery temperature control method shown in an exemplary embodiment of the present application;

[0018] Figure 2 is a flowchart of a power battery temperature control method shown in an exemplary embodiment of the present application;

[0019] Figure 3 is a schematic diagram of the vehicle cooling power curve and the battery heat dissipation power curve shown in a specific embodiment of the present application;

[0020] Figure 4 is a block diagram of a power battery temperature control device shown in an exemplary embodiment of the present application;

[0021] Figure 5 is a schematic diagram of the structure of an electronic device shown in an exemplary embodiment of the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] The following describes the implementation manners of the present application through specific examples. Those skilled in the art can easily understand the other advantages and effects of the present application from the content disclosed in this specification. The present application can also be implemented or applied through other different specific implementation manners. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present application. It should be noted that, without conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0023] It should be noted that the illustrations provided in the following embodiments only schematically illustrate the basic concept of the present application. Therefore, only the components related to the present application are shown in the drawings, rather than being drawn according to the number, shape, and size of the components in actual implementation. The type, quantity, and proportion of each component in actual implementation can be arbitrarily changed, and the layout type of the components may also be more complex.

[0024] It should be noted that in the present application, "first", "second", etc. are only used to distinguish similar objects, and are not used to limit the order or sequence of similar objects. The described "including", "having", etc. are modified forms, indicating that the scope covered by the subject of the word does not exclude other examples except the examples shown by the word.

[0025] It can be understood that the various numerical numbers, step numbers, etc. recorded in the present application are for the convenience of description and are not used to limit the scope of the present application. The size of the labels in the present application does not mean the sequence of execution. The execution sequence of each process should be determined according to its function and internal logic.

[0026] In the following description, a large number of details are discussed to provide a more thorough explanation of the embodiments of the present application. However, it is obvious to those skilled in the art that the embodiments of the present application can be implemented without these specific details. In other embodiments, well-known structures and devices are shown in the form of block diagrams rather than in detail to avoid making the embodiments of the present application difficult to understand.

[0027] It should be noted that although the fast charging technology of the power battery system can improve the battery charging speed and reduce the charging anxiety of new energy vehicle users, due to the high heat generation of the power battery during the fast charging process and the limited refrigeration power of the vehicle as a whole, once effective heat dissipation cannot be carried out to control the temperature of the power battery system, it may lead to too high a temperature, which in turn affects the charging rate and may even cause safety problems in severe cases. In the fast charging scenario, the thermal management strategy usually requests coolants at different temperatures according to the temperature of the power battery system. When the temperature of the power battery system is high, a lower coolant temperature is requested to enhance heat dissipation; when the temperature of the power battery system is low, a higher coolant temperature is requested or cooling is not carried out. However, in the case of limited refrigeration power of the vehicle as a whole, when the temperature of the power battery system is too high, the heat dissipation capacity of the liquid cooling system needs to be improved, but the vehicle refrigeration system may not be able to meet the heat dissipation and temperature control requirements of the power battery system; when the temperature of the power battery system is low, since the requested coolant water temperature is high, the temperature difference between the power battery system and the coolant is reduced, resulting in insufficient heat dissipation power and thus the inability to fully utilize the refrigeration capacity of the vehicle as a whole. These two situations will both cause the fast charging scenario to be unable to effectively control the temperature of the power battery within a suitable range, affecting the charging rate and increasing the charging time.

[0028] To solve these problems, embodiments of the present application respectively propose a method for controlling the temperature of a power battery, a device for controlling the temperature of a power battery, a vehicle, an electronic device, a computer-readable storage medium, and a computer program product. These embodiments will be described in detail below.

[0029] Please refer to Figure 1 , Figure 1 which is a schematic diagram of the implementation environment of a method for controlling the temperature of a power battery shown in an exemplary embodiment of the present application.

[0030] As shown in Figure 1As shown in the figure, the implementation environment may include a new energy vehicle 110 and a computer device 120. Among them, the new energy vehicle 110 is equipped with a power battery and a power battery thermal management system. The computer device 120 may be at least one of a microcomputer, an embedded computer, a neural network computer, etc., and no limitation is imposed here. The computer device 120 may be configured in the new energy vehicle 110 and independent of the power battery thermal management system of the new energy vehicle 110. The computer device 120 may also be configured in the power battery thermal management system of the new energy vehicle 110. The computer device 120 may also be a computer device independent of the new energy vehicle 110, and no limitation is imposed here either. The computer device 120 may be used to perform iterative calculations on the battery SOC and battery temperature of the power battery to estimate the battery temperature at the end of charging of the power battery, and when the estimated battery temperature is too high, control the coolant to cool the power battery through the power battery thermal management system of the new energy vehicle 110. The new energy vehicle 110 may be used to collect the charging target SOC and battery temperature threshold of the power battery, collect the current battery SOC and current battery temperature of the power battery, and the current coolant temperature of the coolant, and provide them to the computer device 120 for processing. Of course, the computer device 120 may also obtain the charging target SOC and battery temperature threshold of the power battery through the cloud, and control the new energy vehicle 110 to collect the current battery SOC and current battery temperature of the power battery, and the current coolant temperature of the coolant.

[0031] Schematically, the computer device 120 obtains the charging target SOC of the power battery and the battery temperature threshold, and the new energy vehicle 110 collects the current battery SOC and current battery temperature of the power battery, and the current coolant temperature of the coolant. The computer device 120 performs iterative calculations on the battery SOC and battery temperature of the power battery according to the data collected by the new energy vehicle 110 until the battery SOC obtained by the iterative calculation reaches the charging target SOC, so as to obtain the estimated battery temperature at the end of charging of the power battery; compare the estimated battery temperature with the battery temperature threshold, if the estimated battery temperature is greater than the battery temperature threshold, the power battery thermal management system of the new energy vehicle 110 is used to control the coolant to cool the power battery. It can be seen that the technical solution of the embodiment of the present application can more accurately estimate the battery temperature at the end of charging of the power battery by performing iterative calculations on the battery SOC and battery temperature according to the collected current battery SOC, current battery temperature and current coolant temperature. This estimation mechanism can predict whether the temperature of the power battery will exceed the battery temperature threshold during the charging process, so as to achieve early prediction of the too high temperature of the power battery. Once the estimated battery temperature is greater than the battery temperature threshold, the cooling of the power battery by the coolant can be immediately triggered. This strategy of turning on the cooling control in advance can effectively avoid the situation of too high temperature of the power battery during the actual charging process, ensure the charging efficiency, protect the power battery from high temperature damage, extend the service life of the power battery, and ensure the safety of the power battery.

[0032] It should be noted that the power battery temperature control method provided by the embodiment of the present application can be specifically executed by the computer device 120. Correspondingly, the power battery temperature control device can be set in the computer device 120.

[0033] Please refer to Figure 2 , Figure 2 is a flowchart of a power battery temperature control method shown in an exemplary embodiment of the present application. This power battery temperature control method can be applied to Figure 1 the shown implementation environment and is specifically executed by the computer device 120 in this implementation environment. It should be understood that this power battery temperature control method can also be applicable to other exemplary implementation environments and be specifically executed by devices in other implementation environments. The embodiment does not limit the implementation environment applicable to this power battery temperature control method.

[0034] As Figure 2 shown, in an exemplary embodiment, this power battery temperature control method at least includes steps S210 to S230, which are introduced in detail as follows:

[0035] Step S210, obtain the charging target SOC of the power battery and the battery temperature threshold.

[0036] In one embodiment of the present application, SOC (State of Charge), also known as the remaining battery charge, represents the ratio of the remaining dischargeable charge of the battery to the fully charged state charge after the battery has been used or left idle for a period of time, usually expressed as a percentage. The charging target SOC of the power battery refers to the remaining charge or state of charge that the power battery expects to reach or maintain during the charging process. The charging target SOC of the power battery can be preset, such as 100%, 99% or other percentages, or the charging target SOC of the power battery can be dynamically obtained. For example, the user can input the charging target SOC through a mobile device or the in-vehicle center console according to the demand, and no limitation is imposed here. The battery temperature threshold of the power battery can be preset, such as 40°C, 45°C or other temperature values, or the battery temperature of the power battery can also be determined according to parameters such as the charging target SOC of the power battery and the allowable charging current. For example, the allowable charging current of different battery SOC values at different battery temperatures can be established through experiments in advance to form a relationship table. Based on the currently obtained charging target SOC of the power battery, the allowable charging current of this charging target SOC at different battery temperatures is matched from the relationship table, and a battery temperature corresponding to a randomly selected allowable charging current is used as the battery temperature threshold, and no limitation is imposed here either.

[0037] In one embodiment of the present application, obtaining the battery temperature threshold of the power battery includes: obtaining the maximum charging current of the charging pile; determining the allowable charging current of the charging target SOC at different battery temperatures from a preset charging Map table, where the charging Map table represents the corresponding relationship between the battery SOC and battery temperature of the power battery and the allowable charging current; and determining the battery temperature threshold according to the maximum charging current of the charging pile and the allowable charging current of the charging target SOC at different battery temperatures.

[0038] In this embodiment, the maximum charging current of the charging pile can be obtained through the charging pile user manual, or the maximum charging current of the charging pile can be determined by connecting the charging pile and the vehicle and monitoring the current change during the charging process, and no limitation is imposed here. Different values of battery SOC and different values of battery temperature can be preset, and the allowable charging current of the power battery at each battery SOC and each battery temperature can be obtained through experiments to establish the corresponding relationship among battery SOC, battery temperature and allowable charging current, and form a charging Map table. The obtained charging Map table includes different values of battery SOC and the allowable charging current of the battery SOC at different battery temperatures. Taking the current charging target SOC of the power battery as an example, the relevant parameters of this charging target SOC in the charging Map table are shown in Table 1. The allowable charging current of this charging target SOC is different under different temperature conditions, where, SOC nLet this be the charging target SOC, T1, T2, ……, T5 be the temperatures of power batteries with different values, i.e., different battery temperatures, where T1 < T2 < T3 < T4 < T5, and I1, I2, ……, I5 are the allowable charging currents for this charging target SOC at T1, T2, ……, T5 respectively, and I max桩 is the maximum charging current of the charging pile.

[0039] It can be seen from Table 1 that when the temperature of the power battery < T2, the temperature is too low and the power battery cannot achieve the optimal charging current. When the temperature of the power battery > T5, the temperature is too high and the optimal charging current cannot be achieved either. Therefore, after determining the allowable charging currents for this charging target SOC at different battery temperatures from the preset charging Map table, each allowable charging current can be compared with the maximum charging current of the charging pile respectively, and an allowable charging current greater than or equal to the maximum charging current of the charging pile can be selected, and the corresponding battery temperature can be used as the battery temperature threshold of the power battery.

[0040] Table 1

[0041] Power battery temperature <![CDATA[SOC n The allowable charging current of the power battery at each temperature of the state]]> <![CDATA[T1]]> <![CDATA[I1(< I max桩 )]]> <![CDATA[T2]]> <![CDATA[I2(≥I max桩 )]]> <![CDATA[T3]]> <![CDATA[I3(≥I max桩 )]]> <![CDATA[T4]]> <![CDATA[I4(≥I max桩 )]]> <![CDATA[T5]]> <![CDATA[I5(<I max桩 )]]>

[0042] In an embodiment of the present application, determining the battery temperature threshold according to the maximum charging current of the charging pile and the allowable charging currents for the charging target SOC at different battery temperatures includes: determining the maximum value among the allowable charging currents for the charging target SOC at different battery temperatures as the initial maximum charging current under the charging target SOC; determining the minimum value between the initial maximum charging current and the maximum charging current of the charging pile as the actual maximum charging current under the charging target SOC; comparing the actual maximum charging current with the allowable charging currents for the charging target SOC at each battery temperature respectively, and selecting the largest allowable charging current from the allowable charging currents whose comparison results meet the preset conditions, so as to use the battery temperature corresponding to the largest allowable charging current as the battery temperature threshold.

[0043] In this embodiment, first obtain the maximum value of the allowable charging current under this charging target SOC from the charging Map table as the initial maximum charging current I max0 , and take the smaller value from I max0 and the maximum charging current I max桩 of the charging pile, that is, MIN(I max0 , I max桩 ), to obtain the actual maximum charging current I max under this charging target SOC. Then, determine the upper limit value of the battery temperature, that is, the battery temperature threshold, according to the preset condition, where the preset condition is that the allowable charging current is greater than or equal to the actual maximum charging current, that is, I i ≥I max , and I i is the allowable charging current, and Imax is the actual maximum charging current. Specifically, according to the actual maximum charging current, the allowable charging current that meets the preset condition is determined from the allowable charging currents at each battery temperature for the charging target SOC, and the maximum value is determined from the allowable charging currents that meet the preset condition, and the corresponding battery temperature is used as the battery temperature threshold, which can maximize the actual charging current of the power battery.

[0044] In a specific embodiment of the present application, assuming in Table 1: T1 = 25 °C, T2 = 30 °C, T3 = 35 °C, T4 = 40 °C, T5 = 45 °C, I1 = 200 A, I2 = 250 A, I3 = 300 A, I4 = 350 A, I5 = 200 A, then, the initial maximum charging current I max0 under the charging target SOC is = I4 = 350 A. Assuming the maximum charging current I max桩 of the charging pile is = 250 A, then, the actual maximum charging current I max under the charging target SOC is = MIN(I max0 , I max桩 ) = MIN(350 A, 250 A) = 250 A. Then, I max is compared with I1, I2, I3, I4, I5 respectively, and the allowable charging currents that meet the preset condition are I2, I3, I4. In order to maximize the actual charging current of the power battery, the upper limit of the power battery temperature is T4, that is, the power battery temperature T4 = 40 °C corresponding to I4 is used as the battery temperature threshold of the power battery.

[0045] Step S220, collect the current battery SOC and current battery temperature of the power battery, and the current coolant temperature of the coolant, and perform iterative calculations on the battery SOC and battery temperature of the power battery according to the collected data until the battery SOC obtained by the iterative calculation reaches the charging target SOC, so as to obtain the estimated battery temperature of the power battery at the end of charging.

[0046] In an embodiment of the present application, starting from the current battery SOC as the calculation starting point, with the preset duration as the calculation step size, according to the currently collected current battery SOC, current battery temperature and current coolant temperature, calculate the battery temperature after the preset duration, calculate the battery SOC after the preset duration according to the currently collected current battery SOC and current battery temperature, and then iteratively calculate the battery temperature and battery SOC after the next preset duration until the battery SOC obtained by the iterative calculation reaches the charging target SOC, and use the battery temperature of this iterative calculation as the estimated battery temperature of the power battery at the end of charging. Through the iterative calculation of the battery temperature and battery SOC of the power battery in this embodiment, the battery temperature of the power battery at the end of charging can be estimated more accurately, so as to anticipate in advance whether the power battery has a situation of too high temperature subsequently.

[0047] In one embodiment of the present application, iterative calculations are performed on the battery SOC and battery temperature of a power battery based on the collected data, including: matching the current battery SOC and the current battery temperature with a preset charging Map table to obtain the allowable charging current corresponding to both the current battery SOC and the current battery temperature as the current charging current of the power battery, where the charging Map table represents the corresponding relationship between the battery SOC and battery temperature of the power battery and the allowable charging current; performing iterative calculations on the battery temperature according to a preset calculation step size, the current battery temperature, the current charging current, and the current coolant temperature to obtain the iteratively calculated battery temperature, and performing iterative calculations on the battery SOC according to the current charging current and the current charge capacity of the power battery to obtain the iteratively calculated battery SOC, where the current charge capacity is calculated based on the current battery SOC and the rated charge capacity of the power battery; when the iteratively calculated battery SOC reaches the charging target SOC, the iteratively calculated battery temperature is used as the estimated battery temperature.

[0048] In this embodiment, starting from the current battery SOC as the calculation starting point, the process of performing iterative calculations on the battery temperature and the battery SOC until the iteratively calculated battery SOC reaches the charging target SOC is as follows:

[0049] 1. Discretize the charging curve. Taking the unit time dt as the calculation step size, look up the charging Map table according to the current battery SOC and the current battery temperature to obtain the allowable charging current corresponding to both the current battery SOC and the current battery temperature as the current charging current, and calculate the battery temperature of the power battery after dt moments. The calculation method is as follows:

[0050] T dt =T b +(I 2 R*dt - A*h*( T b -T f_now )) / Cm Equation (1)

[0051] Where, T dt is the battery temperature after dt moments, T b is the current battery temperature, I is the current charging current, R is the internal resistance of the battery of the power battery, dt is the unit time, A is the heat exchange area of the liquid cooling system of the power battery, h is the heat transfer coefficient of the liquid cooling system of the power battery, T f_now is the current coolant temperature, C is the specific heat capacity of the battery of the power battery, m is the mass of the battery of the power battery, and R, A, h, C, m can be pre-calibrated or set.

[0052] Calculate the battery SOC of the power battery after dt moments. The calculation method is as follows:

[0053] SOCdt = (Q0 + I * dt) / Q e * 100% Equation (2)

[0054] Where, SOC dt is the battery SOC of the power battery after time dt, Q0 is the current charge capacity of the power battery, I is the current charging current, dt is the unit time, and Q e is the rated charge capacity of the power battery. Q0 can be obtained by multiplying the current battery SOC and the rated charge capacity. Q e can be pre-calibrated or set.

[0055] 2. Repeat step 1 until the battery SOC obtained by iterative calculation reaches the charging target SOC, and obtain the estimated battery temperature of the power battery at the end of charging. Wherein, in each iterative calculation, the battery SOC obtained in the previous calculation is used as the current battery SOC in the current iterative calculation, and the battery temperature obtained in the previous calculation is used as the current battery temperature in the current iterative calculation. Since the calculation time is very short, the temperature change of the coolant can be ignored, that is, the currently collected coolant temperature can be used as the current coolant temperature in each iterative calculation.

[0056] Step S230, compare the estimated battery temperature with the battery temperature threshold. If the estimated battery temperature is greater than the battery temperature threshold, control the coolant to cool the power battery.

[0057] In an embodiment of the present application, if the estimated battery temperature is greater than the battery temperature threshold, control the liquid cooling system of the power battery to start cooling. If the estimated battery temperature is less than or equal to the battery temperature threshold, do not start cooling or exit cooling. A target coolant temperature can be set in advance, and the coolant is controlled to cool the power battery according to the target coolant temperature. This embodiment can realize the early prediction of the too high temperature of the power battery. Once the estimated battery temperature is greater than the battery temperature threshold, the coolant can be immediately triggered to cool the power battery, effectively avoiding the situation of too high temperature during the actual charging process of the power battery, ensuring both the charging efficiency and protecting the power battery from high temperature damage, prolonging the service life of the power battery, and ensuring the safety of the power battery.

[0058] In one embodiment of the present application, controlling the coolant to cool the power battery includes: obtaining a plurality of coolant temperatures with different values; calculating the heat dissipation power of the liquid cooling system of the power battery at different coolant temperatures according to the current battery temperature and the plurality of coolant temperatures with different values, and generating a correspondence between the heat dissipation power and the coolant temperature; determining a balance point between the cooling power and the heat dissipation power based on a preset correspondence between the cooling power and the coolant temperature of the whole vehicle and a correspondence between the heat dissipation power and the coolant temperature, and using the coolant temperature at the balance point as the target coolant temperature, so as to control the coolant to cool the power battery according to the target coolant temperature.

[0059] The liquid cooling system of the power battery is an important part of the thermal management system of the power battery, which is mainly composed of coolant, coolant pump, liquid cooling pipeline, heat exchanger and other components. The working principle of the liquid cooling system is that the coolant circulates in the liquid cooling pipeline arranged between the battery modules or in the battery pack, and takes away the heat generated by the battery through heat exchange. When the coolant temperature rises, it exchanges heat with the vehicle refrigeration system through the heat exchanger to further reduce the temperature of the coolant.

[0060] In this embodiment, a plurality of coolant temperatures with different values can be obtained by randomly generating, and a heat dissipation power is calculated according to the current battery temperature and a coolant temperature. In this way, the heat dissipation power of the liquid cooling system of the power battery for different coolant temperatures under the condition of the current battery temperature is calculated, and the calculation method is as follows:

[0061] p p =A*h*(T b -T f ) Formula (3)

[0062] Among them, p p is the heat dissipation power of the power battery liquid cooling system, A is the heat exchange area of the power battery liquid cooling system, h is the heat exchange coefficient of the power battery liquid cooling system, T b is the current battery temperature, T f is the coolant temperature.

[0063] Then, the heat dissipation power of the power battery liquid cooling system at different coolant temperatures is fitted to obtain the battery heat dissipation power curve, and the heat dissipation power curve is used to characterize the corresponding relationship between the heat dissipation power of the liquid cooling system and the coolant temperature.

[0064] Data fitting can be pre - performed on the refrigeration power of the vehicle's entire vehicle refrigeration system for different coolant temperatures fed back by controllers such as VIU (Vehicle Information Unit) and VDC (Vehicle Dynamics Control) to obtain the entire vehicle refrigeration power curve, and the corresponding relationship between the refrigeration power of the entire vehicle and the coolant temperature is characterized by the refrigeration power curve.

[0065] Please refer to Figure 3 , Figure 3 is a schematic diagram of the entire vehicle refrigeration power curve and the battery heat dissipation power curve shown in a specific embodiment of the present application. As Figure 3 shown, the lower the coolant temperature, the higher the heat dissipation power of the power battery and the lower the refrigeration power of the entire vehicle; the higher the coolant temperature, the lower the heat dissipation power of the power battery and the higher the refrigeration power of the entire vehicle. Therefore, the coolant temperature can be used as the abscissa, the heat dissipation power / refrigeration power as the ordinate, and the entire vehicle refrigeration power curve and the battery heat dissipation power curve can be plotted in the same coordinate graph. In this way, the intersection point of the entire vehicle refrigeration power curve and the battery heat dissipation power curve can be found as the balance point of the refrigeration power and the heat dissipation power, and then the abscissa value corresponding to this balance point, that is, the coolant temperature value, can be used as the target coolant temperature to control the coolant to cool the power battery according to the target coolant temperature.

[0066] This embodiment predicts the temperature rise of the battery during the entire charging process, and when it is estimated that the temperature of the power battery is too high, it couples the heat dissipation power of the power battery system, that is, the heat dissipation power, and the refrigeration capacity of the entire vehicle, that is, the refrigeration power, to balance and request a suitable coolant temperature at the inlet of the power battery system. To maximize the refrigeration capacity of the entire vehicle refrigeration system under the condition of limited refrigeration power of the entire vehicle, so that the power battery system can exert the optimal heat dissipation and temperature control effect of the refrigeration system based on the heat dissipation capacity of the power battery system and the refrigeration capacity of the entire vehicle during fast charging, effectively control the temperature of the power battery without increasing the vehicle cost, shorten the fast charging time, and ensure battery safety.

[0067] In an embodiment of the present application, after controlling the coolant to cool the power battery, the method includes: re - collecting the current battery SOC and current battery temperature of the power battery, and the current coolant temperature of the coolant, and re - performing iterative calculations on the battery SOC and battery temperature of the power battery according to the re - collected data until the re - iteratively calculated battery SOC reaches the charging target SOC, and obtaining a new estimated battery temperature of the power battery at the end of charging; if the new estimated battery temperature is less than or equal to the battery temperature threshold, stop the coolant from cooling the power battery.

[0068] In this embodiment, after cooling is turned on, the SOC and temperature of the power battery and the temperature of the coolant can also be collected in real time or periodically. Then, based on the currently re-collected battery SOC, current battery temperature, and current coolant temperature, the battery SOC and battery temperature of the power battery are iteratively calculated again in the manner described in the foregoing embodiment to re-obtain the new estimated battery temperature of the power battery at the end of charging. If the new estimated battery temperature is less than or equal to the battery temperature threshold, cooling is exited. If the new estimated battery temperature is still greater than the battery temperature threshold, cooling remains on.

[0069] When the new estimated battery temperature is still greater than the battery temperature threshold and cooling remains on, a new target coolant temperature can be re-determined, and the coolant is controlled to cool the power battery according to the new target coolant temperature. The process of re-determining the new target coolant temperature includes: calculating the new heat dissipation power of the liquid cooling system of the power battery at different coolant temperatures based on the currently re-collected current battery temperature and multiple coolant temperatures with different values, and generating the corresponding relationship between the new heat dissipation power and the coolant temperature; based on the preset corresponding relationship between the refrigeration power of the whole vehicle and the coolant temperature and the corresponding relationship between the new heat dissipation power and the coolant temperature, determining the new balance point of the refrigeration power and the heat dissipation power, and taking the coolant temperature at the new balance point as the new target coolant temperature.

[0070] Please refer to Figure 4 , Figure 4 which is a block diagram of a power battery temperature control device shown in an exemplary embodiment of the present application. This device can be applied to Figure 1 the implementation environment shown in the figure, and is specifically configured in the computer device 120. This device can also be applicable to other exemplary implementation environments and is specifically configured in other devices. The present embodiment does not limit the implementation environment applicable to this device.

[0071] As Figure 4 shown, this exemplary power battery temperature control device includes: a data acquisition module 410, which is used to obtain the charging target SOC of the power battery and the battery temperature threshold; collect the current battery SOC and current battery temperature of the power battery and the current coolant temperature of the coolant; an information processing module 420, which is used to iteratively calculate the battery SOC and battery temperature of the power battery according to the collected data until the iteratively calculated battery SOC reaches the charging target SOC to obtain the estimated battery temperature of the power battery at the end of charging; a comparison module 430, which is used to compare the estimated battery temperature with the battery temperature threshold; a cooling execution module 440, which is used to control the coolant to cool the power battery through a cooling instruction, where the cooling instruction is generated by triggering the comparison result that the estimated battery temperature is greater than the battery temperature threshold.

[0072] In an embodiment of the present application, the data acquisition module 410 may include various sensors of the vehicle and in-vehicle communication devices such as a T-Box. The data acquisition module 410 may also be a hardware device that collects data from sensors and in-vehicle communication devices such as a T-Box. The information processing module 420 may be a microprocessor or chip such as an MCU (Microcontroller Unit) or an ECU (Electronic Control Unit), or may be a server configured in the cloud. The comparison module 430 may be a logic comparator. The cooling execution module 440 may be an MCU, a driving chip, etc. of the power battery thermal management system or the liquid cooling system, and no limitation is imposed here.

[0073] The cooling execution module 440 may be configured at the vehicle end, and the data acquisition module 410, the information processing module 420, and the comparison module 430 may be configured at the vehicle end or in the cloud. Example 1: The data acquisition module 410, the information processing module 420, the comparison module 430, and the cooling execution module 440 are all configured at the vehicle end; Example 2: The data acquisition module 410, the information processing module 420, and the comparison module 430 are configured in the cloud, and the cooling execution module 440 is configured at the vehicle end; Example 3: The data acquisition module 410 and the cooling execution module 440 are configured at the vehicle end, and the information processing module 420 and the comparison module 430 are configured in the cloud; Example 4: The data acquisition module 410, the comparison module 430, and the cooling execution module 440 are configured at the vehicle end, and the information processing module 420 is configured in the cloud.

[0074] It should be noted that the power battery temperature control device provided in the above embodiment and the power battery temperature control method provided in the above embodiment belong to the same concept. The specific manners in which each module and unit perform operations have been described in detail in the method embodiment, and will not be elaborated here. In practical applications, the power battery temperature control device provided in the above embodiment may, according to needs, allocate the above functions to different functional modules, that is, divide the internal structure of the device into different functional modules to complete all or part of the functions described above, and no limitation is imposed here either.

[0075] This embodiment also provides a vehicle, which includes the power battery temperature control device provided in each of the above embodiments.

[0076] This embodiment also provides an electronic device, including: one or more processors; a storage device for storing one or more programs, and when the one or more programs are executed by the one or more processors, the electronic device implements the power battery temperature control method provided in each of the above embodiments.

[0077] Please refer to Figure 5 ,Figure 5 It is a schematic structural diagram of an electronic device shown in an exemplary embodiment of the present application. It should be noted that Figure 5 the electronic device 500 shown is only an example and should not impose any limitations on the functions and usage scope of the embodiments of the present application.

[0078] As Figure 5 shown, the electronic device 500 includes a processor 501, a memory 502, and a communication bus 503; the communication bus 503 is used to connect the processor 501 and the memory 502; the processor 501 is used to execute the computer program stored in the memory 502 to implement the method in one or more of the above embodiments.

[0079] This embodiment also provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor of the computer, the computer is enabled to execute the power battery temperature control method as described above. The computer-readable storage medium may be included in the electronic device described in the above embodiment, or may exist separately and not be assembled into the electronic device.

[0080] This embodiment also provides a computer program product or a computer program. The computer program product or the computer program includes computer instructions, and the computer instructions are stored in a computer-readable storage medium. The processor of the computer device reads the computer instructions from the computer-readable storage medium, and the processor executes the computer instructions, so that the computer device executes the power battery temperature control method provided in each of the above embodiments.

[0081] The electronic device provided in this embodiment includes a processor, a memory, a transceiver, and a communication interface. The memory and the communication interface are connected to the processor and the transceiver and complete communication with each other. The memory is used to store a computer program, the communication interface is used for communication, and the processor and the transceiver are used to run the computer program to enable the electronic device to execute each step of the above method.

[0082] In this embodiment, the memory may include a random access memory (Random Access Memory, abbreviated as RAM), and may also include a non-volatile memory, such as at least one disk memory.

[0083] The above-mentioned processor may be a general-purpose processor, including a Central Processing Unit (CPU for short), a Network Processor (NP for short), etc.; it may also be a Digital Signal Processor (DSP for short), an Application Specific Integrated Circuit (ASIC for short), a Field-Programmable Gate Array (FPGA for short), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components.

[0084] For the computer-readable storage medium in this embodiment, those of ordinary skill in the art can understand that all or part of the steps for implementing the above method embodiments can be completed by hardware related to a computer program. The aforementioned computer program can be stored in a computer-readable storage medium. When the program is executed, it executes the steps including the above method embodiments; and the aforementioned storage medium includes: various media such as ROM (Read Only Memory), RAM (Random Access Memory), magnetic disks, or optical discs that can store program codes.

[0085] The above embodiments only exemplarily illustrate the principles and effects of the present application, rather than limiting the present application. Any person familiar with this technology can modify or change the above embodiments without departing from the spirit and scope of the present application. Therefore, all equivalent modifications or changes completed by those with ordinary knowledge in the technical field without departing from the spirit and technical ideas disclosed by the present application should still be covered by the claims of the present application.

Claims

1. A temperature control method for a power battery, characterized in that The method includes: Obtaining the charging target SOC of the power battery and the battery temperature threshold; Collecting the current battery SOC and current battery temperature of the power battery, and the current coolant temperature of the coolant, and iteratively calculating the battery SOC and battery temperature of the power battery according to the collected data until the battery SOC obtained by the iterative calculation reaches the charging target SOC, so as to obtain the estimated battery temperature when the charging of the power battery ends; Comparing the estimated battery temperature with the battery temperature threshold, and if the estimated battery temperature is greater than the battery temperature threshold, controlling the coolant to cool the power battery.

2. The method for controlling the temperature of a power battery according to claim 1, wherein Obtaining the battery temperature threshold of the power battery includes: Obtaining the maximum charging current of the charging pile; Based on the charging target SOC, determining the allowable charging current of the charging target SOC at different battery temperatures from a preset charging Map table, where the charging Map table represents the corresponding relationship between the battery SOC and battery temperature of the power battery and the allowable charging current; Determining the battery temperature threshold according to the maximum charging current of the charging pile and the allowable charging current of the charging target SOC at different battery temperatures.

3. The power battery temperature control method according to claim 2, characterized in that, Determining the battery temperature threshold according to the maximum charging current of the charging pile and the allowable charging current of the charging target SOC at different battery temperatures includes: Determining the maximum value of the allowable charging currents of the charging target SOC at different battery temperatures as the initial maximum charging current under the charging target SOC; Determining the minimum value of the initial maximum charging current and the maximum charging current of the charging pile as the actual maximum charging current under the charging target SOC; Comparing the actual maximum charging current with the allowable charging currents of the charging target SOC at each battery temperature respectively, and selecting the largest allowable charging current from the allowable charging currents whose comparison results meet the preset conditions, so as to use the battery temperature corresponding to the largest allowable charging current as the battery temperature threshold.

4. The power battery temperature control method according to claim 1, wherein Iteratively calculating the battery SOC and battery temperature of the power battery according to the collected data includes: Matching the current battery SOC and current battery temperature with a preset charging Map table to obtain the allowable charging current corresponding to both the current battery SOC and current battery temperature as the current charging current of the power battery, where the charging Map table represents the corresponding relationship between the battery SOC and battery temperature of the power battery and the allowable charging current; Iteratively calculating the battery temperature according to a preset calculation step, the current battery temperature, the current charging current and the current coolant temperature to obtain the iteratively calculated battery temperature, and iteratively calculating the battery SOC according to the current charging current and the current charge capacity of the power battery to obtain the iteratively calculated battery SOC, where the current charge capacity is calculated based on the current battery SOC and the rated charge capacity of the power battery; When the battery SOC obtained by the iterative calculation reaches the charging target SOC, using the iteratively calculated battery temperature as the estimated battery temperature.

5. The power battery temperature control method according to any one of claims 1-4, characterized in that, Controlling the coolant to cool the power battery includes: Obtaining coolant temperatures with different values; Calculating the heat dissipation power of the liquid cooling system of the power battery at different coolant temperatures according to the current battery temperature and the coolant temperatures with different values, and generating the corresponding relationship between the heat dissipation power and the coolant temperature; Based on the preset corresponding relationship between the refrigeration power of the whole vehicle and the coolant temperature and the corresponding relationship between the heat dissipation power and the coolant temperature, determining the balance point between the refrigeration power and the heat dissipation power, and using the coolant temperature at the balance point as the target coolant temperature to control the coolant to cool the power battery according to the target coolant temperature.

6. The power battery temperature control method according to any one of claims 1-4, characterized in that After controlling the coolant to cool the power battery, the method includes: Re-collecting the current battery SOC and the current battery temperature of the power battery and the current coolant temperature of the coolant, and re-iteratively calculating the battery SOC and the battery temperature of the power battery according to the re-collected data until the battery SOC obtained by the re-iterative calculation reaches the charging target SOC, so as to obtain the new estimated battery temperature of the power battery at the end of charging; If the new estimated battery temperature is less than or equal to the battery temperature threshold, stop the coolant from cooling the power battery.

7. A power battery temperature control device, characterized in that, The device includes: A data acquisition module, configured to obtain the charging target SOC and the battery temperature threshold of the power battery; collect the current battery SOC and the current battery temperature of the power battery and the current coolant temperature of the coolant; An information processing module, configured to iteratively calculate the battery SOC and the battery temperature of the power battery according to the collected data until the battery SOC obtained by the iterative calculation reaches the charging target SOC, so as to obtain the estimated battery temperature of the power battery at the end of charging; A comparison module, configured to compare the estimated battery temperature with the battery temperature threshold; A cooling execution module, configured to control the coolant to cool the power battery through a cooling instruction, wherein the cooling instruction is generated by the comparison result that the estimated battery temperature is greater than the battery temperature threshold.

8. A vehicle, characterized in that, The vehicle includes the power battery temperature control device according to claim 7.

9. An electronic device, characterized in that, The electronic device includes: One or more processors; A storage device, configured to store one or more programs, and when the one or more programs are executed by the one or more processors, the electronic device implements the power battery temperature control method according to any one of claims 1-6.

10. A computer-readable storage medium, characterized in that, A computer program is stored thereon, and when the computer program is executed by the processor of the computer, the computer executes the power battery temperature control method according to any one of claims 1-6.

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