Low-temperature slow charging control method and device and vehicle

Abstract

The invention discloses a low-temperature slow charging control method and device and a vehicle, and relates to the technical field of battery charging, and the low-temperature slow charging control method comprises the steps that temperature rise data of a battery pack is acquired; based on the temperature rise data of the battery pack, obtaining available charging power of the battery pack; determining a power distribution point based on the charging available power; and based on the power distribution point, distributing the power for charging the battery pack by the charging pile. According to the temperature rise data of the battery pack, the heating power required by the battery pack in the low-temperature environment is obtained; and in combination with the maximum power capable of being provided by the charging pile, the available charging power of the battery pack is obtained. And based on the available charging power of the battery pack and the maximum acceptable charging power of the battery pack, comprehensively considering the heating demand and bearing capacity of the battery pack, and confirming a power distribution point. The power distribution point can realize the distribution of the heating power and the charging power which utilize energy to the maximum extent, improve the charging rate and solve the distribution problem.

Description

Technical Field

[0001] The present application relates to the field of battery charging technology, and in particular to a low-temperature slow charging control method, device and vehicle. Background Art

[0002] Winters in low-temperature regions such as the Northeast and Northwest are extremely cold and last longer, and the number of new energy vehicles connected is far less than in other regions. This shows that low temperatures still have a certain impact on consumers' car purchasing intentions, and vehicle low-temperature resistance technology needs to continue to break through. Improving the user experience of electric vehicles in cold regions is a key problem that restricts the promotion of electric vehicles. It includes two technologies that need to be improved urgently, namely improving endurance attenuation and increasing low-temperature charging speed.

[0003] In northern regions where fast charging stations are underdeveloped, slow charging is a relatively easy-to-obtain and popular means of charging. However, the ambient temperature is low, and the battery's own physical and chemical properties limit the charging power. For example, the charging power limit of a small car currently equipped with a lithium battery may be less than 0.5kW at a low temperature of minus 20 degrees Celsius. Charging in this way will result in a long charging time. Therefore, at low temperatures, the battery pack starts the heating system to increase the battery temperature in order to increase the battery's own allowable charging power. Common heating systems are thermistors that heat battery modules or thermistors that heat circulating water, which heats the battery modules. When charging starts heating, the heating system consumes the energy provided by the charging pile.

[0004] The slow charging power is usually 3.3kW or 6.6kW standard power. The high-power slow charging of 11kW is very scarce even in the south, and even harder to find in the north. 3.3kW is a common charging pile in the north. Therefore, when the charging pile power is limited, how to allocate battery pack heating and battery pack charging is an important issue that needs to be solved. Summary of the invention

[0005] The main purpose of the present application is to provide a low-temperature slow charging control method, device and vehicle, aiming to solve the technical problem that the slow charging power is limited in a low-temperature environment, the power allocation in the existing technology is poor, resulting in slow charging and low utilization.

[0006] To achieve the above-mentioned objectives, the present application proposes a low-temperature slow charging control method, the method comprising: obtaining the temperature rise data of the battery pack; based on the temperature rise data of the battery pack, obtaining the available charging power of the battery pack; based on the available charging power, confirming the power distribution point; based on the power distribution point, allocating the power of the charging pile to charge the battery pack.

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

[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 confirming the power distribution point based on the charging available power includes: obtaining the maximum permitted charging power of the battery pack; mapping the charging available power of the battery pack based on the maximum permitted charging power to obtain the correspondence between the maximum permitted charging power and the charging available power; based on the correspondence, selecting the intersection of the maximum permitted charging power and the charging available power as the power distribution point.

[0010] In one embodiment, the step of confirming the power distribution point based on the available charging power also 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 distribution point based on the corrected temperature rise data of the battery pack; and allocating the power for the charging pile to charge the battery pack based on the corrected power distribution 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] In addition, to achieve the above-mentioned purpose, the present application also proposes a low-temperature slow charging control device, which includes: a data acquisition module for acquiring the temperature rise data of the battery pack; and also for acquiring the charging available power of the battery pack based on the temperature rise data of the battery pack; and also for confirming the power distribution point based on the charging available power; a control module for allocating the power of the charging pile for charging the battery pack based on the power distribution point.

[0013] In addition, to achieve the above-mentioned purpose, the present 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-mentioned purpose, the present application also proposes a storage medium, which is a computer-readable storage medium, and a computer program is stored on the storage medium. When the computer program is executed by the processor, the steps of the low-temperature slow charging control method described above are implemented.

[0015] In addition, to achieve the above-mentioned purpose, the present application also provides a computer program product, which includes a computer program, and when the computer program is executed by a processor, it 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] The heating power required by the battery pack in a low temperature environment is obtained through the temperature rise data of the battery pack; combined with the maximum power that the charging pile can provide, the available power for charging the battery pack is obtained. Based on the available power for charging the battery pack and the maximum acceptable charging power of the battery pack, the heating demand and tolerance of the battery pack are comprehensively considered to confirm the power distribution point. This power distribution point can achieve the distribution of heating power and charging power that maximizes the utilization of energy, improve the charging rate and solve the distribution problem. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0019] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0020] Figure 1 A schematic diagram of a flow chart provided for the first embodiment of the low-temperature slow charging control method of the present application;

[0021] Figure 2 A diagrammatic illustration of the first embodiment of the low-temperature slow charging control method of the present application;

[0022] Figure 3 A schematic diagram of a flow chart provided for the second embodiment of the low temperature slow charging control method of the present application;

[0023] Figure 4 A diagrammatic schematic diagram provided for the second embodiment of the low temperature slow charging control method of the present application;

[0024] Figure 5 Another diagrammatic schematic diagram provided for the second embodiment of the low temperature slow charging control method of the present application;

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

[0026] Figure 7 This is a schematic diagram of the device structure of the hardware operating environment involved in the low-temperature slow charging control method in the embodiment of the present application.

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

[0028] It should be understood that the specific embodiments described herein are only used to explain the technical solutions of the present application and are not used to limit the present application.

[0029] In order to better understand the technical solution of the present application, a detailed description will be given below in conjunction with the accompanying drawings and specific implementation methods.

[0030] A common solution in the prior art is the calibration method, that is, to find the temperature point or heating time through calibration at different low temperatures, according to a fixed threshold of the heating target higher than the ambient temperature, or to heat in a cyclical manner, or to heat according to the maximum power of the heater itself.

[0031] It is understandable that since the power of slow charging piles is always limited, if more power is consumed for heating, less power will be used to charge the battery pack, resulting in slow charging speed; if more power is used for charging, less power will be allocated for heating, and the battery pack may cool down, further limiting the charging power, which also leads to slow charging speed. We still need to face the technical problem of limited slow charging power and poor power allocation in low temperature environments, resulting in slow charging and low utilization.

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

[0033] It should be noted that the execution subject of this embodiment may be a computing service device with data processing, network communication and program running functions, such as a tablet computer, a personal computer, a mobile phone, etc., or an electronic device, a vehicle, etc. capable of realizing the above functions. The following takes a vehicle as an example to illustrate this embodiment and the following embodiments.

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

[0035] Step S10, obtaining temperature rise data of the battery pack.

[0036] It should be noted that the temperature rise data of a battery pack usually refers to the temperature rise 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 service life of the battery pack.

[0037] It is understandable that in the low-temperature slow-charging environment faced by this solution, the temperature rise data of the battery pack often depends on the distribution of heating power. The greater the heating power, the faster the temperature rise rate of the battery pack is usually. This is because more heat is input into the battery pack, causing the temperature to rise rapidly. Therefore, in this application, the temperature rise data of the battery pack refers to the temperature rise data corresponding to the change in heating power, that is, the heating power corresponding to each temperature point when it is stable.

[0038] In a feasible implementation, the present 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 for the battery pack temperature to reach a preset target temperature; based on the preset heating power, obtaining the temperature rise data of the heated battery pack.

[0039] It is understood that thermal conductivity parameters generally include thermal conductivity, also known as thermal conductivity, specific heat capacity, etc. These parameters describe the performance of materials in the heat conduction process.

[0040] It should be noted that special thermal conductivity measuring instruments, such as the hot wire method, laser flash method, etc., can be used to directly measure the thermal conductivity of the battery pack or its key materials. It should be noted that these methods usually require the destruction of the battery pack to obtain the test sample. The thermal conductivity can also be calculated by measuring the temperature change of the battery pack under specific conditions and combining it with the heat transfer equation. For example, the thermal conductivity can be calculated by measuring the temperature change and time of the battery pack during heating or cooling, as well as information such as the size and mass of the battery, using the concepts of thermal resistance and heat capacity. It is usually necessary to consider the physical properties of the battery pack shell design.

[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. According to the principles of thermodynamics, the heat Q required for the battery pack to rise from the current temperature to the target temperature is calculated. In order to estimate the required heating power, we need to consider the heating time and heating efficiency. The heating power P can be calculated by 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] It is understandable that the heating process of the battery pack is a complex heat transfer process involving multiple heat transfer methods such as heat 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 heated battery pack can be obtained by fitting, and the temperature changes under the conditions of heating power changes can be monitored in real time. Finally, a suitable fitting model can be selected for fitting, which can accurately depict the corresponding heating power when each temperature point is stable, that is, the temperature rise data.

[0045] Specifically, assuming that the rated power of the charging pile is 3.3kW, and 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 corresponding heating power when each temperature point is stable is the balance between the battery heating power and the heat exchange loss power between the battery pack and the environment. When the conduction and heat transfer coefficients are constant, it basically shows a linear relationship.

[0046] It can be understood that, due to the linear relationship, when the battery pack is charged, the full power of the charging pile is used for heating, heating from the initial temperature of -20 degrees Celsius in the environment to a stable temperature point. According to the thermal conductivity of the battery pack and the physical characteristics of the shell design, by measuring the heating power of 3.3kW, the battery can be maintained at around -10 degrees Celsius. Figure 2 , Figure 2 This is a graphical diagram of Example 1 of the low-temperature slow charging control method of the present application. The -10 degrees Celsius point of 3.3kW is connected with the original starting point to obtain the heating temperature-power consumption line, that is, the temperature rise data of the battery pack.

[0047] It is worth noting that since 3.3kW is the maximum power that the charging pile can provide, the equilibrium temperature point that can be maintained by the 3.3kW heating power is the maximum heating power temperature point. If it exceeds this point to the right, it means that the power consumed by the battery pack heating exceeds the power provided by the charging pile, and the power inside the battery pack will be consumed more.

[0048] Step S20: acquiring the available charging power of the battery pack based on the temperature rise data of the battery pack.

[0049] It should be noted that the available charging power is the charging power that the battery pack can accept. This is because the charging power that the battery pack can accept is subject to dual limitations of the output power of the charging pile and the heating power required in a low temperature environment.

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

[0051] It is understandable that the rated power of charging piles varies depending on the type, design and technical parameters of the charging pile. AC charging piles generally use 220V single-phase power supply, and their maximum power is usually between 3.3 kW and 7 kW. This type of charging pile is mainly used in home charging scenarios, and the charging speed is relatively slow, but it is suitable for charging at night or when parking for a long time.

[0052] It should be noted that the rated power of the charging pile can be obtained through the signal sent by the vehicle detection pile, and the charging pile and the vehicle exchange information through specific communication protocols. These protocols usually include charging control pilot 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 power supply capacity and charging parameters of the charging pile, so as to determine 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 residual power of the charging pile.

[0054] It should be noted that the available power for charging the battery pack can be close to or equal to the remaining power of the charging pile under ideal conditions if the remaining power of the charging pile is large enough and the battery pack is in a state that can accept charging.

[0055] Specifically, following the above assumptions, refer 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, 3.3kW, which refers to the remaining charging power of the pile when heated to each temperature point.

[0056] Step S30: confirming a power allocation point based on the available charging power.

[0057] It should be noted that the power distribution point is the ratio of the rated power of the charging pile to the heating power and the charging power. For the charging power of the battery pack, because it is limited by the available charging power, the charging power is kept at the available charging power, that is, the best energy utilization position. Therefore, using the available charging power as a benchmark to determine the power distribution point can achieve the best efficiency.

[0058] It is understood that the heating power required to maintain the battery pack within the appropriate operating temperature range is calculated based on the temperature of the battery pack and the manufacturer's recommendations. The power actually available for charging is determined within the limits of the rated power of the charging pile and the available charging power. The charging power is kept equal to the available charging power to achieve optimal use of energy. Based on the results of the determination of the heating power demand and the charging power, the power allocation point is calculated.

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

[0060] It should be noted that the maximum allowable charging power of the battery pack represents the maximum charging power line limited by the battery's own physical and chemical properties. Figure 2 If the battery temperature is lower than -24 degrees Celsius, it can only be heated. At this time, the battery pack cannot be used for charging. This characteristic interval is the heating zone. If the battery temperature increases, the maximum allowable charging power also increases. When the battery temperature is -6 degrees Celsius, the allowable charging power of the battery pack is equal to the maximum power of the pile, and the power of the pile can be used entirely for charging. In the range of -24 degrees Celsius to -6 degrees Celsius, the power provided by the charging pile is greater than the allowable charging power of the battery pack. In this section, a portion of the energy of the charging pile can be allocated to heat the battery pack, thereby increasing the charging speed. If the battery temperature continues to increase, the maximum allowable charging power of the battery will continue to increase, which will exceed that of the slow charging pile by several times. Usually, between 25 degrees Celsius and 35 degrees Celsius, the allowable charging power reaches its peak. When the temperature exceeds 40 degrees Celsius, in order to prevent further heating and damage to the battery, the allowable charging rate will drop rapidly. Therefore, the relationship curve between the allowable charging power of the entire battery and the battery temperature is as follows Figure 2 The relationship curve between the maximum allowable charging power of the battery and the battery temperature is obtained from the 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 and is reflected in the image. The horizontal axis is the temperature of the battery pack, and the vertical axis achieves a one-to-one correspondence, that is, the correspondence between the maximum permitted charging power and the available charging power is obtained.

[0062] It should be noted that the intersection of the maximum permitted charging power and the available charging power is selected as the power allocation point. Ideally, this intersection 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 is selected as the power allocation point. If the two curves do not intersect directly, but there is a certain overlapping area, it is necessary to select a suitable point in the overlapping area as the power allocation point based on the charging strategy and safety considerations.

[0063] Specifically, refer to Figure 2 The intersection point is the intersection of the maximum permitted charging power curve and the charging available power curve on the image.

[0064] Step S40: Based on the power distribution point, the power for the charging pile to charge the battery pack is distributed.

[0065] It should be noted that once the power allocation point is determined, the vehicle will calculate the charging power that should be allocated to the battery pack based on this point. This power value should neither exceed the maximum allowable charging power of the battery pack nor the rated power of the charging pile itself, while also taking into account the real-time charging power available for the battery pack. At this point, heating can keep the battery pack in a stable temperature state and charge it at the maximum allowable charging power at this temperature point.

[0066] Specifically, in low-temperature slow charging, if the heating temperature does not rise enough, resulting in the charging power being lower than the remaining available power of the pile, there is an obvious waste of the maximum output power of the pile, so the efficiency will be lower than that of this solution.

[0067] It is understandable that if the heating temperature rises above the temperature calculated by the principle of this solution, the battery temperature will be high for a short period of time, so the charging power can be increased in the subsequent short period, but because the difference between the battery temperature and the ambient temperature is large, the heat dissipation power will increase. Subsequently, as the power used for charging increases, the power used for heating will be relatively small, and the battery temperature will gradually decrease to the point where the charging power is limited.

[0068] It is understandable that this process is characterized by repeated fluctuations in the battery temperature at the equilibrium temperature. Each fluctuation cycle can be viewed in three stages. In the first stage, the pile power is mainly used for heating, so the power used for charging can only be relatively reduced. Compared with this solution, the high heating temperature leads to a large loss of heat dissipation power, and the charging speed is relatively low. In this stage, the pile power must be more wasteful in heat dissipation than in this solution, because the temperature difference between the battery pack and the ambient temperature is large. In the second stage, due to the heating in the front section, the battery pack temperature is increased relative to this solution, so the charging power can be increased, and the heating power can only be relatively reduced. At this time, the charging power is increased, but the battery temperature will continue to drop. In the third stage, the battery pack temperature drops, resulting in a charging power lower than the remaining pile available power, and there is an obvious waste of the maximum output power of the pile. Therefore, in this repeated fluctuation of the battery pack temperature, the power output of the pile to the vehicle is inefficient. First, more heat is dissipated to the environment, and second, the pile power is underutilized. Therefore, when the battery pack charge capacity is constant, according to the overall energy transfer conservation, the pile's energy transfer efficiency is not as good as 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 temperature rise data of the battery pack; the available power for charging the battery pack is obtained in combination with the maximum power that the charging pile can provide. Based on the available power for charging the battery pack and the maximum acceptable charging power of the battery pack, the heating demand and tolerance of the battery pack are comprehensively considered to determine the power distribution point. This power distribution point can achieve the distribution of heating power and charging power that maximizes the utilization of energy, improve the charging rate and solve the distribution problem.

[0070] Furthermore, based on the above embodiments, the present application also proposes a correction scheme for the power distribution point to further improve the efficiency, please refer to Figure 3 , Figure 3 A schematic diagram of the flow chart provided for the second embodiment of the low-temperature slow charging control method of the present application.

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

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

[0073] It should be noted that the self-heating power of the battery pack refers to the heat generated by the battery pack during discharge or charging due to internal resistance, chemical reaction and other factors. Therefore, the temperature change depends not only on the heating power allocated to the battery pack, so it is necessary to calculate the self-heating power of the battery pack.

[0074] It is understandable that, 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, and it is sufficient to calculate based on the available charging power of the battery pack.

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

[0076] It should be noted that the maximum self-heating 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] For details, please refer to Figure 4 The maximum charging power line consists of two sections. The left section is from the maximum allowable charging power low temperature zone to the intersection with the available charging power line, and the right section is from the intersection of the available charging power line. The first section represents the maximum charging power line that can be implemented at these temperature points due to the limitations of the physical and chemical characteristics of the battery pack itself. After passing through the maximum allowable charging power low temperature zone to the intersection with the available charging power line, the remaining power available for charging limits the maximum charging power that can be implemented.

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

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

[0080] Step A30: confirming the corrected power distribution point based on the corrected temperature rise data of the battery pack.

[0081] Step A40: Based on the corrected power distribution point, the power used by the charging pile to charge the battery pack is distributed.

[0082] It is understandable that since the charging current causes the battery pack to generate a small amount of heat, the heating power can be reduced appropriately, that is, the available charging power can be increased appropriately. During actual adjustment, fine-tuning can be performed through experimental calibration.

[0083] Specifically, following the above assumption, the charging available power line is corrected to be the charging available power correction line, referring to Figure 5 The intersection of the available charging power correction line and the maximum permitted charging power line is the optimal heating power and charging power allocation point after correction, which is slightly moved to the upper right compared to before correction.

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

[0085] It should be noted that the above examples are only used to understand the present application and do not constitute a limitation on the low-temperature slow charging control method of the present application. More simple transformations based on this technical concept are all within the scope of protection of the present application.

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

[0087] The low-temperature slow charging control device provided by the present application adopts the low-temperature slow charging control method in the above-mentioned embodiment, which can solve the technical problem that the slow charging power is limited in a low-temperature environment and the power allocation in the prior art is poor, resulting in slow charging and low utilization. Compared with the prior art, the beneficial effects of the low-temperature slow charging control device provided by the present application are the same as the beneficial effects of the low-temperature slow charging control method provided by the above-mentioned embodiment, and the other technical features in the low-temperature slow charging control device are the same as the features disclosed in the above-mentioned embodiment method, which will not be repeated here.

[0088] The present application provides a vehicle, comprising: at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can execute the low-temperature slow charging control method in the above-mentioned embodiment one.

[0089] Reference below Figure 7 , which shows a schematic diagram of a structure of a vehicle suitable for implementing the embodiment of the present application. The vehicle in the embodiment of the present application may include but is not limited to mobile terminals such as mobile phones, laptop computers, digital broadcast receivers, PDAs (Personal Digital Assistants), PADs (Portable Application Descriptions), PMPs (Portable Media Players), vehicle-mounted terminals (such as vehicle-mounted navigation terminals), etc., and fixed terminals such as digital TVs, desktop computers, etc. Figure 7 The vehicle shown is merely an example and should not bring any limitation to the functions and scope of use of the embodiments of the present application.

[0090] like Figure 7 As shown, the vehicle may include a processing device 1001 (e.g., a central processing unit, a graphics processor, etc.), which can perform various appropriate actions and processes according to a program stored in a read-only memory (ROM: Read Only Memory) 1002 or a program loaded from a storage device 1003 to a random access memory (RAM: Random Access Memory) 1004. In RAM1004, various programs and data required for vehicle operation are also stored. The processing device 1001, ROM1002, and RAM1004 are connected to each other via a bus 1005. An input / output (I / O) interface 1006 is also connected to the bus. Generally, the following systems can be connected to the I / O interface 1006: an input device 1007 including, for example, a touch screen, a touch pad, a keyboard, a mouse, an image sensor, a microphone, an accelerometer, a gyroscope, etc.; an output device 1008 including, for example, a liquid crystal display (LCD: Liquid Crystal Display), a speaker, a vibrator, etc.; a storage device 1003 including, for example, a magnetic tape, a hard disk, etc.; and a communication device 1009. The communication device 1009 can allow the vehicle to communicate with other devices wirelessly or by wire to exchange data. Although the figure shows a vehicle with various systems, it should be understood that it is not required to implement or have all the systems shown. More or fewer systems can be implemented or have alternatively.

[0091] In particular, according to the embodiments disclosed in the present application, the process described above with reference to the flowchart can be implemented as a computer software program. For example, the embodiments disclosed in the present application include a computer program product, which includes a computer program carried on a computer-readable medium, and the computer program includes a program code for executing the method shown in the flowchart. In such an embodiment, the computer program can be downloaded and installed from a network through a communication device, or installed from a storage device 1003, or installed from a ROM 1002. When the computer program is executed by the processing device 1001, the above-mentioned functions defined in the method of the embodiment disclosed in the present application are executed.

[0092] The vehicle provided by the present application adopts the low-temperature slow charging control method in the above embodiment, which can solve the technical problem that the slow charging power is limited in a low-temperature environment and the power allocation in the prior art is poor, resulting in slow charging and low utilization. Compared with the prior art, the beneficial effects of the vehicle provided by the present application are the same as the beneficial effects of the low-temperature slow charging control method provided by the above embodiment, and the other technical features of the vehicle are the same as the features disclosed in the method of the previous embodiment, which will not be repeated here.

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

[0094] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

[0095] The present application provides a computer-readable storage medium having computer-readable program instructions (ie, computer programs) stored thereon, and the computer-readable program instructions are used to execute the low-temperature slow charging control method in the above-mentioned embodiment.

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

[0097] The computer-readable storage medium may be included in the vehicle, or may exist independently without being installed in the vehicle.

[0098] The above-mentioned computer-readable storage medium carries one or more programs. When the above-mentioned one or more programs are executed by the vehicle, the vehicle: obtains the temperature rise data of the battery pack; based on the temperature rise data of the battery pack, obtains the charging available power of the battery pack; based on the charging available power, confirms the power distribution point; based on the power distribution point, distributes the power of the charging pile to charge the battery pack.

[0099] Computer program code for performing the operations of the present application may be written in one or more programming languages ​​or a combination thereof, including object-oriented programming languages ​​such as Java, Smalltalk, C++, and conventional procedural programming languages ​​such as "C" or similar programming languages. The program code may be executed entirely on the user's computer, partially on the user's computer, as a separate software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or may 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 possible architecture, functions and operations of the systems, methods and computer program products according to various embodiments of the present application. In this regard, each box in the flowchart or block diagram can represent a module, a program segment or a part of a code, and the module, a program segment or a part of the code contains one or more executable instructions for realizing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the box can also occur in a different order from the order marked in the accompanying drawings. For example, two boxes represented in succession can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the block diagram and / or flowchart, and the combination of boxes in the block diagram and / or flowchart can be implemented with a dedicated hardware-based system that performs a specified function or operation, or can be implemented with a combination of dedicated hardware and computer instructions.

[0101] The modules involved in the embodiments of the present application may be implemented by software or hardware, wherein the name of the module does not limit the unit itself in some cases.

[0102] The readable storage medium provided in the present application is a computer-readable storage medium, which stores computer-readable program instructions (i.e., computer programs) for executing the above-mentioned low-temperature slow charging control method, and can solve the technical problem that the power of slow charging is limited in a low-temperature environment, and the power allocation in the prior art is poor, resulting in slow charging and low utilization. Compared with the prior art, the beneficial effects of the computer-readable storage medium provided in the present application are the same as the beneficial effects of the low-temperature slow charging control method provided in the above-mentioned embodiment, and will not be repeated here.

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

[0104] The computer program product provided by this application can solve the technical problem that the power of slow charging is limited in low temperature environment, and the power allocation in the prior art is poor, resulting in slow charging and low utilization. Compared with the prior art, the beneficial effects of the computer program product provided by this application are the same as those of the low temperature slow charging control method provided in the above embodiment, and will not be repeated here.

[0105] The above descriptions are only some embodiments of the present application, and are not intended to limit the patent scope of the present application. All equivalent structural changes made using the contents of the present application specification and drawings under the technical concept of the present application, or direct / indirect applications in other related technical fields are included in the patent protection scope of the present application.

Claims

1. A low temperature slow charging control method, characterized in that: The method comprises: Obtain the temperature rise data of the battery pack; Based on the temperature rise data of the battery pack, obtaining the charging available power of the battery pack; Based on the available charging power, determining a power allocation point; Based on the power distribution point, the power used by the charging pile to charge the battery pack is distributed.

2. The low temperature slow charging control method according to claim 1, characterized in that: The step of obtaining the temperature rise data of the heated battery pack includes: Obtain the thermal conductivity parameters of the battery pack; Based on the thermal conductivity parameters of the battery pack, a preset heating power is obtained for the battery pack temperature to reach a preset target temperature; Based on the preset heating power, temperature rise data of the heated battery pack is obtained.

3. The low temperature slow charging control method according to claim 2, 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: Get the rated power of the charging pile; Based on the rated power of the charging pile and the temperature rise data of the battery pack, obtaining the remaining power of the charging pile; Based on the remaining power of the charging pile, the available charging power of the battery pack is obtained.

4. The low temperature slow charging control method according to claim 3, characterized in that: The step of confirming the power allocation point based on the available charging power includes: Obtaining the maximum permissible charging power of the battery pack; Mapping the available charging power of the battery pack based on the maximum permitted charging power to obtain a corresponding relationship between the maximum permitted charging power and the available charging power; Based on the corresponding relationship, the intersection point of the maximum permitted charging power and the available charging power is selected as the power allocation point.

5. The low temperature slow charging control method according to claim 1 or 4, characterized in that: After the step of confirming the power allocation point based on the available charging power, the step further includes: Based on the available charging power of the battery pack, the self-heating power of the battery pack is obtained; Correcting the temperature rise data of the battery pack based on the self-heating power of the battery pack; Based on the corrected temperature rise data of the battery pack, confirm the corrected power distribution point; Based on the corrected power distribution point, the power used by the charging pile to charge the battery pack is distributed.

6. The low temperature slow charging control method according to claim 5, characterized in that: The step of obtaining the self-heating power of the battery pack based on the charging available power of the battery pack includes: Based on the available charging power of the battery pack, obtain the charging current; Get 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.

7. A low temperature slow charging control device, characterized in that: The device comprises: A data acquisition module, used to acquire temperature rise data of a battery pack; further used to acquire charging available power of the battery pack based on the temperature rise data of the battery pack; further used to confirm a power allocation point based on the charging available power; The control module is used to allocate the power used by the charging pile to charge the battery pack based on the power distribution point.

8. A vehicle, characterized in that: The vehicle comprises: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the computer program is configured to implement the steps of the low-temperature slow charging control method according to any one of claims 1 to 6.

9. 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, the steps of the low-temperature slow charging control method according to any one of claims 1 to 6 are implemented.

10. A computer program product, characterized in that The computer program product comprises a computer program, and when the computer program is executed by a processor, the steps of the low-temperature slow charging control method according to any one of claims 1 to 6 are implemented.

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