Low-temperature slow charging control method and apparatus, and vehicle

Abstract

A low-temperature slow charging control method and apparatus, and a vehicle. The method comprises: acquiring temperature rise data of a battery pack (S10); acquiring the available charging power of the battery pack on the basis of the temperature rise data of the battery pack (S20); determining a power distribution point on the basis of the available charging power (S30); and on the basis of the power distribution point, distributing the power of a charging pile to charge the battery pack (S40). The heating power required by the battery pack in a low-temperature environment is acquired on the basis of the temperature rise data of the battery pack; the available charging power of the battery pack is acquired on the basis of the maximum power that can be provided by the charging pile; the heating demand and the bearing capacity of the battery pack are comprehensively considered on the basis of the available charging power of the battery pack and the maximum acceptable charging power of the battery pack, and the power distribution point is determined; and the power distribution point can be used for achieving the distribution of the heating power and the charging power so as to maximize the utilization of energy, thereby improving the charging rate and solving the distribution problem.

Description

Low-temperature slow charging control methods, devices and vehicles Technical Field

[0001] This application relates to the field of battery charging technology, and in particular to low-temperature slow charging control methods, devices, and vehicles. Background Technology

[0002] In cold regions such as Northeast and Northwest China, winters are extremely cold and prolonged, resulting in a significantly lower adoption rate of new energy vehicles compared to other areas. This indicates that low temperatures still influence consumer purchasing decisions, and breakthroughs in vehicle low-temperature resistance technology are needed. Improving the user experience for electric vehicle users in cold regions is a key challenge hindering the widespread adoption of electric vehicles. This includes two critical technologies that urgently need improvement: mitigating range degradation and increasing charging speed in low temperatures.

[0003] In northern regions where fast charging stations are underdeveloped, slow charging is a more readily available and widely adopted method for replenishing power. However, low ambient temperatures limit the charging power of batteries due to their inherent physical and chemical properties. For example, in typical small cars equipped with lithium batteries, the charging power may be limited to less than 0.5kW at temperatures as low as -20 degrees Celsius, resulting in excessively long charging times. Therefore, battery pack heating systems are activated at low temperatures to raise the battery temperature and increase the battery's permissible charging power. Common heating systems involve using thermistors to heat the battery modules or using thermistors to heat circulating water, which in turn heats the battery modules. When heating is activated during charging, the heating system consumes energy provided by the charging station.

[0004] Slow charging power is typically 3.3kW or 6.6kW, while high-power slow charging (11kW) is very rare even in the south, and even harder to find in the north. 3.3kW is a more common charging station in northern regions. Therefore, given the limited power of charging stations, how to allocate power between battery pack heating and battery pack charging is an important issue that needs to be addressed. Summary of the Invention

[0005] The main purpose of this application is to provide a low-temperature slow charging control method, device and vehicle, which aims to solve the technical problem of poor power distribution in the prior art, which leads to slow charging and low utilization rate due to limited slow charging power in low-temperature environments.

[0006] To achieve the above objectives, this application proposes a low-temperature slow charging control method, the method comprising: acquiring temperature rise data of a battery pack; acquiring the available charging power of the battery pack based on the temperature rise data of the battery pack; confirming a power allocation point based on the available charging power; and allocating power for charging the battery pack by a charging pile based on the power allocation point.

[0007] In one embodiment, the step of obtaining temperature rise data of the heated battery pack includes: obtaining the thermal conductivity parameters of the battery pack; obtaining a preset heating power for the battery pack temperature to reach a preset target temperature based on the thermal conductivity parameters of the battery pack; and obtaining temperature rise data of the heated battery pack based on the preset heating power.

[0008] In one embodiment, the step of obtaining the available charging power of the battery pack based on the temperature rise data of the battery pack includes: obtaining the rated power of the charging pile; obtaining the remaining power of the charging pile based on the rated power of the charging pile and the temperature rise data of the battery pack; and obtaining the available charging power of the battery pack based on the remaining power of the charging pile.

[0009] In one embodiment, the step of determining the power allocation point based on the available charging power includes: obtaining the maximum permitted charging power of the battery pack; mapping the available charging power of the battery pack based on the maximum permitted charging power to obtain the correspondence between the maximum permitted charging power and the available charging power; and selecting the intersection of the maximum permitted charging power and the available charging power as the power allocation point based on the correspondence.

[0010] In one embodiment, after the step of confirming the power allocation point based on the available charging power, the method further includes: obtaining the self-heating power of the battery pack based on the available charging power of the battery pack; correcting the temperature rise data of the battery pack based on the self-heating power of the battery pack; confirming the corrected power allocation point based on the corrected temperature rise data of the battery pack; and allocating the charging pile to charge the battery pack based on the corrected power allocation point.

[0011] In one embodiment, the step of obtaining the self-heating power of the battery pack based on the available charging power of the battery pack includes: obtaining the charging current based on the available charging power of the battery pack; obtaining the rated data of the battery pack; and obtaining the self-heating power of the battery pack based on the charging current and the rated data.

[0012] Furthermore, to achieve the above objectives, this application also proposes a low-temperature slow charging control device, which includes: a data acquisition module for acquiring temperature rise data of the battery pack; for acquiring the available charging power of the battery pack based on the temperature rise data of the battery pack; and for confirming a power allocation point based on the available charging power; and a control module for allocating power for charging the battery pack by the charging pile based on the power allocation point.

[0013] In addition, to achieve the above objectives, this application also proposes a vehicle, the device comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, the computer program being configured to implement the steps of the low-temperature slow charging control method as described above.

[0014] In addition, to achieve the above objectives, this application also proposes a storage medium, which is a computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, it implements the steps of the low-temperature slow charging control method described above.

[0015] In addition, to achieve the above objectives, this application also provides a computer program product, which includes a computer program that, when executed by a processor, implements the steps of the low-temperature slow charging control method described above.

[0016] One or more technical solutions proposed in this application have at least the following technical effects:

[0017] By analyzing the battery pack's temperature rise data, the heating power required by the battery pack in low-temperature environments is obtained. Combined with the maximum power provided by the charging station, the usable charging power of the battery pack is determined. Based on the usable charging power and the battery pack's maximum acceptable charging power, the heating requirements and tolerance of the battery pack are comprehensively considered to determine the power allocation point. This power allocation point maximizes the allocation of heating and charging power, improving the charging rate and solving the allocation problem. Attached Figure Description

[0018] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0019] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 is a flowchart of the low-temperature slow charging control method provided in Embodiment 1 of this application;

[0021] Figure 2 is a schematic diagram of Embodiment 1 of the low-temperature slow charging control method of this application;

[0022] Figure 3 is a flowchart of the low-temperature slow charging control method provided in Embodiment 2 of this application;

[0023] Figure 4 is a schematic diagram of Embodiment 2 of the low-temperature slow charging control method of this application;

[0024] Figure 5 is another schematic diagram provided in Embodiment 2 of the low-temperature slow charging control method of this application;

[0025] Figure 6 is a schematic diagram of the module structure of the low-temperature slow charging control device according to an embodiment of this application;

[0026] Figure 7 is a schematic diagram of the hardware operating environment involved in the low-temperature slow charging control method in the embodiments of this application.

[0027] The purpose, features, and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0028] It should be understood that the specific embodiments described herein are merely illustrative of the technical solutions of this application and are not intended to limit this application.

[0029] To better understand the technical solution of this application, a detailed description will be provided below in conjunction with the accompanying drawings and specific implementation methods.

[0030] A common solution in existing technologies is the calibration method, which involves finding the temperature point or heating time at different low temperatures through calibration, fixing the threshold according to the heating target above the ambient temperature, or cyclically heating according to the time, or heating at a time according to the maximum power of its own heater.

[0031] Understandably, since the power of a slow charging station is always limited, if more power is consumed for heating, less power will be available for charging the battery pack, resulting in slow charging speed. Conversely, if more power is used for charging, less power will be available for heating, potentially causing the battery pack to cool down and further limiting charging power, also leading to slow charging speed. The technical challenges of limited power distribution and low utilization in low-temperature environments remain.

[0032] Based on this, the present application provides a low-temperature slow charging control method. Referring to Figure 1, Figure 1 is a flowchart of the first embodiment of the low-temperature slow charging control method of the present application.

[0033] It should be noted that the executing entity in this embodiment can be a computing service device with data processing, network communication, and program execution functions, such as a tablet computer, personal computer, or mobile phone, or an electronic device or vehicle capable of performing the above functions. The following description uses a vehicle as an example to illustrate this embodiment and the subsequent embodiments.

[0034] In this embodiment, the low-temperature slow charging control method includes steps S10 to S40:

[0035] Step S10: Obtain the temperature rise data of the battery pack.

[0036] It should be noted that battery pack temperature rise data typically refers to the increase in temperature of the battery pack relative to the ambient temperature during operation. This data is one of the important indicators for evaluating the thermal management performance, safety, and lifespan of a battery pack.

[0037] Understandably, in the low-temperature slow-charging environment addressed by this solution, the battery pack's temperature rise data often depends on the distribution of heating power; the higher the heating power, the faster the battery pack's temperature rise rate typically is. This is because more heat is input into the battery pack, causing the temperature to rise rapidly. Therefore, in this application, the battery pack's temperature rise data refers to the temperature rise data corresponding to changes in heating power, that is, the heating power corresponding to the stable temperature at each point.

[0038] In one feasible implementation, this application provides a method for obtaining temperature rise data corresponding to changes in heating power, as follows: obtaining the thermal conductivity parameters of the battery pack; based on the thermal conductivity parameters of the battery pack, obtaining the preset heating power required for the battery pack temperature to reach a preset target temperature; and based on the preset heating power, obtaining the temperature rise data of the heated battery pack.

[0039] Understandably, thermal conductivity parameters typically include thermal conductivity, also known as thermal conductivity coefficient, specific heat capacity, etc. These parameters describe the performance of a material during the heat conduction process.

[0040] It should be noted that specialized thermal conductivity measuring instruments, such as the hot-wire method and laser scintillation method, can be used to directly measure the thermal conductivity of the battery pack or its key materials. However, these methods typically require damaging the battery pack to obtain a test sample. Alternatively, the thermal conductivity can be estimated by measuring the temperature change of the battery pack under specific conditions and combining this with heat transfer equations. For example, the thermal conductivity can be estimated by measuring the temperature change and time during heating or cooling of the battery pack, as well as information such as the battery's size and mass, using the concepts of thermal resistance and heat capacity. The physical characteristics of the battery pack casing design usually need to be considered.

[0041] It should be noted that the target temperature that the battery pack needs to reach is selected as the preset target temperature for calculating the preset heating power. Based on thermodynamic principles, the amount of heat Q required for the battery pack to rise from its current temperature to the target temperature is calculated. To estimate the required heating power, we need to consider heating time and heating efficiency. The heating power P can be calculated using the following formula: P = Q / (t × η).

[0042] Where P is the heating power (W), Q is the required heat (J), and t is the heating time (s). In practical applications, the heating efficiency is usually not 100%, so an efficiency factor η needs to be introduced to correct the heating power.

[0043] Understandably, the heating process of a battery pack is a complex heat transfer process involving multiple heat transfer modes such as conduction, convection, and radiation. Therefore, when calculating the heating power, it is also necessary to consider the heat transfer process inside the battery pack and the heat dissipation conditions of the external environment.

[0044] It should be noted that, based on the preset heating power, the temperature rise data of the heating battery pack can be obtained through fitting. By monitoring the temperature change under the condition of changing heating power in real time, and finally selecting a suitable fitting model for fitting, the heating power corresponding to each stable temperature point, i.e., the temperature rise data, can be accurately described.

[0045] Specifically, assuming the rated power of the charging pile is 3.3kW, taking the battery pack at an initial ambient temperature of -20 degrees Celsius as an example, when the battery pack temperature is heated from -20 degrees Celsius, the heating power corresponding to the stable temperature at each temperature point is the balance between the battery heating power and the heat transfer loss power between the battery pack and the environment. Under the condition that the conduction and heat transfer coefficients are constant, it basically shows a linear relationship.

[0046] Understandably, due to the linear relationship, when the battery pack is charging, the entire power of the charging pile can be used for heating, from an initial ambient temperature of -20 degrees Celsius to a stable temperature point. Based on the thermal conductivity of the battery pack and the physical characteristics of the casing design, by measuring the heating power of 3.3kW, the battery can be maintained at around -10 degrees Celsius. Referring to Figure 2, which is a schematic diagram of the low-temperature slow charging control method provided in Embodiment 1 of this application, the heating temperature-power consumption line is obtained by connecting the -10 degree Celsius point of 3.3kW with the original starting point, i.e., the temperature rise data of the battery pack.

[0047] It's important to note that since 3.3kW is the maximum power a charging station can provide, the equilibrium temperature point that can be maintained with 3.3kW heating power is the maximum heating power temperature point. If the temperature exceeds this point, it means that the battery pack's heating power consumption exceeds the power provided by the charging station, which will accelerate the consumption of electricity within the battery pack.

[0048] Step S20: Based on the temperature rise data of the battery pack, obtain the available charging power of the battery pack.

[0049] It should be noted that the available charging power refers to the charging power that the battery pack can accept. This is because the charging power that the battery pack can accept is limited by both the output power of the charging pile and the heating power required in low-temperature environments.

[0050] In one feasible implementation, this solution provides a method for obtaining the available charging power of the battery pack, as follows: obtaining the rated power of the charging pile; obtaining the remaining power of the charging pile based on the rated power of the charging pile and the temperature rise data of the battery pack; and obtaining the available charging power of the battery pack based on the remaining power of the charging pile.

[0051] Understandably, the rated power of charging piles varies depending on their type, design, and technical parameters. AC charging piles generally use a 220V single-phase power supply, with a maximum power typically between 3.3 kW and 7 kW. These charging piles are mainly used for home charging scenarios, and while the charging speed is relatively slow, they are suitable for charging overnight or during long periods of parking.

[0052] It should be noted that the rated power of a charging station can be obtained through signals emitted by the vehicle detection station. The charging station and the vehicle exchange information via specific communication protocols. These protocols typically include charging control guidance circuit (CP) signals and other related communication protocols (such as ISO 15118, GB / T 27930, etc.). Through these protocols, the vehicle can obtain information such as the charging station's power supply capacity and charging parameters, thereby determining whether to start charging and the specific parameters during the charging process.

[0053] It should be noted that the rated power of the charging pile minus the heating power obtained from the temperature rise data of the battery pack is the remaining power of the charging pile.

[0054] It should be noted that, under ideal conditions, if the charging station has sufficient remaining power and the battery pack is in an acceptable charging state, the available charging power of the battery pack can be close to or equal to the remaining power of the charging station.

[0055] Specifically, continuing with the assumption above and referring to Figure 2, the available charging power is obtained by subtracting the heating power value of the heating temperature-power consumption line from the rated power of the charging pile of 3.3kW. It refers to the charging power remaining in the pile after heating to each temperature point.

[0056] Step S30: Based on the available charging power, confirm the power allocation point.

[0057] It should be noted that the power allocation point is the ratio of the charging pile's rated power allocated to heating power and charging power. Since the charging power of the battery pack is limited by the available charging power, maintaining the charging power at the available power level, i.e., the optimal energy utilization point, allows for the achievement of optimal efficiency.

[0058] Understandably, based on the battery pack's temperature and the manufacturer's recommendations, the heating power required to maintain the battery pack within its suitable operating temperature range is calculated. Within the limitations of the charging station's rated power and available charging power, the actual power available for charging is determined. The charging power is kept equal to the available charging power to achieve optimal energy utilization. Based on the determined heating power requirements and charging power, the power allocation point is calculated.

[0059] In one feasible implementation, this solution provides a method for determining the power allocation point based on the available charging power, as follows: obtaining the maximum permitted charging power of the battery pack; mapping the available charging power of the battery pack based on the maximum permitted charging power to obtain the correspondence between the maximum permitted charging power and the available charging power; and selecting the intersection of the maximum permitted charging power and the available charging power as the power allocation point based on the correspondence.

[0060] It should be noted that the maximum permissible charging power of the battery pack represents the maximum charging power limit imposed by the battery's own physicochemical properties. Specifically, as illustrated in Figure 2, when the battery temperature is below -24 degrees Celsius, it can only be heated; the battery pack cannot be used for charging at this time. This characteristic range is the heating zone. If the battery temperature increases, the maximum permissible charging power also increases. When the battery temperature is -6 degrees Celsius, the permissible charging power of the battery pack equals the maximum power of the charging station, meaning the station's power can be fully used for charging. Within the range of -24 degrees Celsius to -6 degrees Celsius, the power provided by the charging station exceeds the battery pack's permissible charging power. In this range, a portion of the charging station's energy can be allocated to heating the battery pack, thereby increasing the charging speed. If the battery temperature continues to rise, the maximum permissible charging power continues to increase, exceeding the power provided by slow charging stations by several times. Typically, the permissible charging power peaks between 25 and 35 degrees Celsius. When the temperature exceeds 40 degrees Celsius, the permissible charging rate will rapidly decrease to prevent further heat damage to the battery. Therefore, the relationship between the battery's permissible charging power and battery temperature is shown in Figure 2. The curve showing the relationship between the battery's maximum permissible charging power and battery temperature is obtained from test data provided by the battery manufacturer based on the charging characteristics of the battery module.

[0061] It should be noted that the available charging power of the battery pack is mapped based on the maximum permitted charging power. The mapping is based on the temperature of the battery pack. In the image, the horizontal axis represents the temperature of the battery pack, and the vertical axis represents the one-to-one correspondence between the maximum permitted charging power and the available charging power.

[0062] It should be noted that the intersection of the maximum permissible charging power and the available charging power is selected as the power allocation point. Ideally, this intersection point represents the optimal state where the battery pack can be safely charged and fully utilize the charging power at a specific temperature. If the two curves intersect, the intersection point is selected as the power allocation point. If the two curves do not intersect directly but have some overlap, a suitable point within the overlap area needs to be selected as the power allocation point based on the charging strategy and safety considerations.

[0063] Specifically, referring to Figure 2, the intersection point is the point where the maximum permitted charging power curve and the available charging power curve intersect on the image.

[0064] Step S40: Based on the power allocation point, allocate the power of the charging pile to charge the battery pack.

[0065] It's important to note that once the power allocation point is determined, the vehicle calculates the charging power that should be allocated to the battery pack based on this point. This power value should not exceed the battery pack's maximum permissible charging power, nor the charging station's rated power, while also taking into account the battery pack's real-time available charging power. Heating at this point allows the battery pack to reach a stable temperature and be charged at the maximum permissible charging power at that temperature.

[0066] Specifically, in low-temperature slow charging, if the heating temperature does not rise sufficiently, resulting in a charging power lower than the remaining usable power of the charging station, there will be a significant waste of the station's maximum output power, thus the efficiency will be lower than that of this solution.

[0067] Understandably, if the heating temperature exceeds the temperature calculated based on the principle of this solution, there will be a short period of high battery temperature. This allows for a short period of increased charging power, but because of the large temperature difference between the battery and the ambient temperature, the heat dissipation power increases. Subsequently, as the power used for charging increases, the power used for heating will be relatively smaller, and the battery temperature will gradually decrease until it reaches the point where the charging power is limited.

[0068] Understandably, this process is characterized by repeated fluctuations in battery temperature around the equilibrium temperature. Each fluctuation cycle can be viewed in three stages. In the first stage, the charging pile's power is primarily used for heating, thus the power available for charging must be relatively reduced. Compared to this solution, the higher heating temperature leads to greater heat dissipation power loss and a relatively slower charging speed. In this stage, the charging pile's power is more wasted on heat dissipation than this solution because of the large temperature difference between the battery pack and the environment. In the second stage, due to the initial heating, the battery pack temperature is relatively higher than in this solution, allowing for increased charging power. Therefore, the heating power must be relatively reduced, resulting in increased charging power, but the battery temperature continues to drop. In the third stage, the battery pack temperature drops, causing the charging power to fall below the remaining usable power of the charging pile, resulting in a significant waste of the pile's maximum output power. Therefore, in this process of repeated fluctuations in battery pack temperature, the power output from the charging pile to the vehicle is inefficiently utilized. Firstly, more heat is dissipated into the environment; secondly, the charging pile's power is underutilized. Therefore, given a fixed battery pack charge capacity, based on the principle of overall energy conservation, the energy transfer efficiency of the charging pile is lower than that of the solution mentioned in this case.

[0069] In this embodiment, the heating power required by the battery pack in a low-temperature environment is obtained through the battery pack's temperature rise data; combined with the maximum power that the charging pile can provide, the available charging power of the battery pack is obtained. Based on the available charging power and the maximum acceptable charging power of the battery pack, the heating requirements and tolerance of the battery pack are comprehensively considered to determine the power allocation point. This power allocation point can achieve the allocation of heating power and charging power that maximizes energy utilization, improving the charging rate and solving the allocation problem.

[0070] Furthermore, based on the above embodiments, this application also proposes a correction scheme for the power distribution point to further improve efficiency. Please refer to Figure 3, which is a flowchart of Embodiment 2 of the low-temperature slow charging control method of this application.

[0071] In this embodiment, after the step of confirming the power allocation point based on the available charging power, steps A10 to A40 are further included:

[0072] Step A10: Obtain the self-heating power of the battery pack based on the available charging power of the battery pack.

[0073] It should be noted that the self-heating power of a battery pack refers to the heat generated during discharge or charging due to factors such as internal resistance and chemical reactions. Therefore, temperature changes depend not only on the heating power allocated to the battery pack, but also on the self-heating power of the battery pack itself, thus requiring calculation.

[0074] Understandably, since the available charging power of the battery pack is limited, it is not necessary to calculate the self-heating power of the battery pack throughout the entire process; calculations can be made only based on the available charging power of the battery pack.

[0075] In one feasible implementation, this solution provides a method for obtaining the available charging power of a battery pack, as follows: obtaining the charging current based on the available charging power of the battery pack; obtaining the rated data of the battery pack; and obtaining the self-heating power of the battery pack based on the charging current and the rated data.

[0076] It should be noted that the maximum self-generated heat power of the battery pack is obtained by multiplying the square of the charging current at that power by the internal resistance of the battery pack.

[0077] Specifically, referring to Figure 4, the maximum charging power line consists of two segments. The left segment extends from the low-temperature zone of the maximum permissible charging power to the intersection with the usable charging power line. The right segment's intersection point represents the remaining portion of the usable charging power line. The first segment represents the maximum feasible charging power line formed at these temperature points due to the limitations of the battery pack's own physicochemical properties. After passing through the low-temperature zone of the maximum permissible charging power to the intersection with the usable charging power line, the remaining usable charging power limits the feasible maximum charging power.

[0078] Therefore, this heat is generally less when charging at low temperatures. For example, a certain 500km range battery pack has an internal resistance of less than 0.4 ohms, and when charging at -15℃, the heat generated by the charging current is less than 7W.

[0079] Step A20: Correct the temperature rise data of the battery pack based on the self-heating power of the battery pack.

[0080] Step A30: Based on the corrected temperature rise data of the battery pack, confirm the corrected power distribution point.

[0081] Step A40: Based on the corrected power allocation point, allocate the power of the charging pile to charge the battery pack.

[0082] It is understandable that since the charging current generates a small amount of heat in the battery pack, the heating power can be appropriately reduced, and the usable charging power can be appropriately increased. In actual adjustment, fine-tuning can be achieved through experimental calibration.

[0083] Specifically, following the above assumptions, the available charging power line is corrected to become the available charging power correction line. Referring to Figure 5, the intersection of the available charging power correction line and the maximum permissible charging power line is the corrected optimal heating power and charging power allocation point, which is slightly shifted to the upper right compared to before correction.

[0084] In this embodiment, the self-heating factor of the battery pack is taken into account, the distribution of heating power is reduced, the charging power is further improved, and thus the charging efficiency is improved.

[0085] It should be noted that the above examples are only for understanding this application and do not constitute a limitation on the low-temperature slow charging control method of this application. Any simple modifications based on this technical concept are within the protection scope of this application.

[0086] This application also provides a low-temperature slow charging control device. Referring to Figure 6, the low-temperature slow charging control device includes: a data acquisition module 10, used to acquire temperature rise data of the battery pack; also used to acquire the available charging power of the battery pack based on the temperature rise data of the battery pack; also used to confirm the power allocation point based on the available charging power; and a control module 20, used to allocate the power of the charging pile to charge the battery pack based on the power allocation point.

[0087] The low-temperature slow charging control device provided in this application, employing the low-temperature slow charging control method described in the above embodiments, can solve the technical problem of slow charging and low utilization rate caused by poor power distribution in existing technologies with limited slow charging power in low-temperature environments. Compared with the prior art, the beneficial effects of the low-temperature slow charging control device provided in this application are the same as those of the low-temperature slow charging control method provided in the above embodiments, and other technical features in the low-temperature slow charging control device are the same as those disclosed in the methods of the above embodiments, and will not be repeated here.

[0088] This application provides a vehicle, the vehicle including: at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, the instructions being executed by the at least one processor to enable the at least one processor to perform the low-temperature slow charging control method in Embodiment 1 above.

[0089] Referring now to Figure 7, a structural schematic diagram of a vehicle suitable for implementing embodiments of this application is shown. The vehicle in embodiments of this application may include, but is not limited to, mobile terminals such as mobile phones, laptops, digital broadcast receivers, PDAs (Personal Digital Assistants), PADs (Portable Application Description), PMPs (Portable Media Players), in-vehicle terminals (e.g., in-vehicle navigation terminals), and fixed terminals such as digital TVs and desktop computers. The vehicle shown in Figure 7 is merely an example and should not impose any limitations on the functionality and scope of use of embodiments of this application.

[0090] As shown in Figure 7, the vehicle may include a processing unit 1001 (e.g., a central processing unit, a graphics processing unit, etc.), which can perform various appropriate actions and processes according to a program stored in a read-only memory (ROM) 1002 or a program loaded from a storage device 1003 into a random access memory (RAM) 1004. The RAM 1004 also stores various programs and data required for vehicle operation. The processing unit 1001, ROM 1002, and RAM 1004 are interconnected via a bus 1005. An input / output (I / O) interface 1006 is also connected to the bus. Typically, the following systems can be connected to the I / O interface 1006: input devices 1007 including, for example, a touchscreen, touchpad, keyboard, mouse, image sensor, microphone, accelerometer, gyroscope, etc.; output devices 1008 including, for example, a liquid crystal display (LCD), speaker, vibrator, etc.; storage devices 1003 including, for example, magnetic tape, hard disk, etc.; and communication devices 1009. The communication device 1009 allows the vehicle to communicate wirelessly or wiredly with other devices to exchange data. Although vehicles with various systems are shown in the figures, it should be understood that implementation or possession of all the systems shown is not required. More or fewer systems may be implemented alternatively.

[0091] Specifically, according to the embodiments disclosed in this application, the processes described above with reference to the flowcharts can be implemented as computer software programs. For example, embodiments disclosed in this application include a computer program product comprising a computer program carried on a computer-readable medium, the computer program containing program code for performing the methods shown in the flowcharts. In such embodiments, the computer program can be downloaded and installed from a network via a communication device, or installed from storage device 1003, or installed from ROM 1002. When the computer program is executed by processing device 1001, it performs the functions defined in the methods of the embodiments disclosed in this application.

[0092] The vehicle provided in this application, employing the low-temperature slow charging control method described in the above embodiments, can solve the technical problem of slow charging and low utilization rate caused by poor power distribution in existing technologies with limited slow charging power in low-temperature environments. Compared with the prior art, the beneficial effects of the vehicle provided in this application are the same as those of the low-temperature slow charging control method provided in the above embodiments, and other technical features of the vehicle are the same as those disclosed in the previous embodiment method, and will not be repeated here.

[0093] It should be understood that the various parts disclosed in this application can be implemented using hardware, software, firmware, or a combination thereof. In the description of the above embodiments, specific features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples.

[0094] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

[0095] This application provides a computer-readable storage medium having computer-readable program instructions (i.e., a computer program) stored thereon, the computer-readable program instructions being used to execute the low-temperature slow charging control method in the above embodiments.

[0096] The computer-readable storage medium provided in this application may be, for example, a USB flash drive, but is not limited to, electrical, magnetic, optical, electromagnetic, infrared, or semiconductor systems, devices, or any combination thereof. More specific examples of computer-readable storage media may include, but are not limited to: electrical connections with one or more wires, portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fibers, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof. In this embodiment, the computer-readable storage medium may be any tangible medium containing or storing a program that can be used by or in conjunction with an instruction execution system, system, or device. The program code contained on the computer-readable storage medium may be transmitted using any suitable medium, including but not limited to: wires, optical cables, RF (Radio Frequency), etc., or any suitable combination thereof.

[0097] The aforementioned computer-readable storage medium may be included in the vehicle or may exist independently and not installed in the vehicle.

[0098] The aforementioned computer-readable storage medium carries one or more programs that, when executed by a vehicle, cause the vehicle to: acquire temperature rise data of the battery pack; acquire the available charging power of the battery pack based on the temperature rise data; determine a power allocation point based on the available charging power; and allocate power for charging the battery pack to the charging pile based on the power allocation point.

[0099] Computer program code for performing the operations of this application can be written in one or more programming languages ​​or a combination thereof, including object-oriented programming languages ​​such as Java, Smalltalk, and C++, and conventional procedural programming languages ​​such as the "C" language or similar programming languages. The program code can be executed entirely on the user's computer, partially on the user's computer, as a standalone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving remote computers, the remote computer can be connected to the user's computer via any type of network—including a Local Area Network (LAN) or a Wide Area Network (WAN)—or can be connected to an external computer (e.g., via the Internet using an Internet service provider).

[0100] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to various embodiments of this application. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions indicated in the blocks may occur in a different order than those indicated in the drawings. For example, two consecutively indicated blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in the block diagrams and / or flowcharts, and combinations of blocks in the block diagrams and / or flowcharts, may be implemented using a dedicated hardware-based system that performs the specified function or operation, or using a combination of dedicated hardware and computer instructions.

[0101] The modules described in the embodiments of this application can be implemented in software or hardware. The names of the modules do not necessarily limit the functionality of the unit itself.

[0102] The readable storage medium provided in this application is a computer-readable storage medium that stores computer-readable program instructions (i.e., a computer program) for executing the above-described low-temperature slow charging control method. This solves the technical problem of slow charging and low utilization caused by poor power distribution in existing technologies with limited slow charging power in low-temperature environments. Compared with the prior art, the beneficial effects of the computer-readable storage medium provided in this application are the same as those of the low-temperature slow charging control method provided in the above embodiments, and will not be repeated here.

[0103] This application also provides a computer program product, including a computer program that, when executed by a processor, implements the steps of the low-temperature slow charging control method described above.

[0104] The computer program product provided in this application can solve the technical problem of slow charging and low utilization rate caused by poor power distribution in the prior art due to limited slow charging power in low-temperature environments. Compared with the prior art, the beneficial effects of the computer program product provided in this application are the same as those of the low-temperature slow charging control method provided in the above embodiments, and will not be repeated here.

[0105] The above description is only a part of the embodiments of this application and does not limit the patent scope of this application. All equivalent structural transformations made under the technical concept of this application and using the contents of the specification and drawings of this application, or direct / indirect applications in other related technical fields, are included in the patent protection scope of this application.

Claims

A low-temperature slow charging control method, characterized in that, The method includes: Obtain the temperature rise data of the battery pack; Based on the temperature rise data of the battery pack, the available charging power of the battery pack is obtained; Based on the available charging power, determine the power allocation point; Based on the power allocation point, the power allocated by the charging pile for charging the battery pack is determined. The low-temperature slow charging control method as described in claim 1 is characterized in that, The steps for obtaining temperature rise data of the heated battery pack include: Obtain the thermal conductivity parameters of the battery pack; Based on the thermal conductivity parameters of the battery pack, the preset heating power is obtained to reach the preset target temperature of the battery pack. Based on the preset heating power, the temperature rise data of the heating battery pack is obtained. The low-temperature slow charging control method as described in claim 2 is characterized in that, The step of obtaining the available charging power of the battery pack based on the temperature rise data of the battery pack includes: Obtain the rated power of the charging station; Based on the rated power of the charging pile and the temperature rise data of the battery pack, the remaining power of the charging pile is obtained; Based on the remaining power of the charging pile, the available charging power of the battery pack is obtained. The low-temperature slow charging control method as described in claim 3 is characterized in that, The step of determining the power allocation point based on the available charging power includes: Obtain the maximum permitted charging power of the battery pack; The available charging power of the battery pack is mapped based on the maximum permitted charging power to obtain the correspondence between the maximum permitted charging power and the available charging power; Based on the aforementioned correspondence, the intersection of the maximum permitted charging power and the available charging power is selected as the power allocation point. The low-temperature slow charging control method as described in claim 1 or 4 is characterized in that, The step of confirming the power allocation point based on the available charging power further includes: The self-heating power of the battery pack is obtained based on the available charging power of the battery pack. The temperature rise data of the battery pack is corrected based on the self-heating power of the battery pack. Based on the corrected temperature rise data of the battery pack, the corrected power distribution point is confirmed; Based on the corrected power allocation point, the power allocated by the charging pile for charging the battery pack is determined. The low-temperature slow charging control method as described in claim 5 is characterized in that, The step of obtaining the self-heating power of the battery pack based on its available charging power includes: The charging current is obtained based on the available charging power of the battery pack; Obtain the rated data of the battery pack; Based on the charging current and the rated data, the self-heating power of the battery pack is obtained. A low-temperature slow charging control device, characterized in that, The device includes: The data acquisition module is used to acquire temperature rise data of the battery pack; it is also used to acquire the available charging power of the battery pack based on the temperature rise data of the battery pack; and it is also used to confirm the power allocation point based on the available charging power. The control module is used to allocate power for charging the battery pack by the charging pile based on the power allocation point. A vehicle characterized in that, The vehicle includes: a memory, a processor, and a computer program stored in the memory and executable on the processor, the computer program being configured to implement the steps of the low-temperature slow charging control method as described in any one of claims 1 to 6. A storage medium, characterized in that, The storage medium is a computer-readable storage medium, and a computer program is stored on the storage medium. When the computer program is executed by a processor, it implements the steps of the low-temperature slow charging control method as described in any one of claims 1 to 6. A computer program product, characterized in that, The computer program product includes a computer program that, when executed by a processor, implements the steps of the low-temperature slow charging control method as described in any one of claims 1 to 6.

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