Method, device, computer equipment and storage medium for preheating automobile battery

Abstract

The present application relates to a method, device, computer equipment and storage medium for preheating a car battery. The method comprises: obtaining a first output power of a charging pile, adjusting the actual preheating power according to the first output power and the real-time ambient temperature so that the actual preheating power is less than the first output power; and preheating the car battery according to the actual preheating power. The use of this method can improve the problem of undervoltage in the prior art when using an external charging pile to preheat a battery in a low temperature environment.

Description

Technical Field

[0001] The present application relates to the technical field of vehicle-mounted batteries, and in particular to a method, device, computer equipment and storage medium for preheating a vehicle battery. Background Art

[0002] Electric vehicles mainly rely on battery power generation to provide power, but in low temperature environments, the activity of the battery will be greatly affected, resulting in a reduction in the battery discharge capacity, thereby reducing the endurance of the electric vehicle. At present, the method of preheating the battery by charging with an external charging pile in a low temperature environment can be used to improve the battery discharge capacity, but when using an external charging pile to preheat the battery, the charging pile temperature is too low and the power output is small. When the power used for battery preheating is large, it is easy to cause the charging pile to be undervoltage, affecting the stability of electric vehicle charging. Summary of the invention

[0003] Based on this, a method, device, computer equipment and storage medium for preheating a car battery are provided to improve the problem in the prior art that undervoltage is prone to occur when using an external charging pile to preheat the battery in a low temperature environment.

[0004] In one aspect, a method for preheating a vehicle battery is provided, the method comprising:

[0005] Acquire a first output power of the charging pile, and adjust an actual preheating power according to the first output power and the real-time ambient temperature so that the actual preheating power is less than the first output power;

[0006] The vehicle battery is preheated according to the actual preheating power.

[0007] In one embodiment, obtaining a first output power of a charging pile, and adjusting an actual preheating power according to the first output power and a real-time ambient temperature so that the actual preheating power is less than the first output power, includes:

[0008] Obtain a second output power of the vehicle power supply, and obtain an estimated preheating power according to the first output power and the second output power; and adjust the actual preheating power according to the estimated preheating power and the real-time ambient temperature so that the actual preheating power is less than or equal to the estimated preheating power.

[0009] In one embodiment, the first output power of the charging pile is obtained, and the actual preheating power is adjusted according to the first output power and the real-time ambient temperature so that the actual preheating power is less than the first output power, including: obtaining the first output power of the charging pile, and obtaining the change rate of the first output power according to the first output power and the real-time ambient temperature; determining a preheating time threshold according to the change rate of the first output power, and adjusting the actual preheating power according to the preheating time threshold.

[0010] In one embodiment, a first output power of a charging pile is obtained, and an actual preheating power is adjusted according to the first output power and the real-time ambient temperature so that the actual preheating power is less than the first output power, including: obtaining an estimated preheating power under low-temperature preheating, and determining an output power threshold of the charging pile according to the estimated preheating power; obtaining the first output power of the charging pile, comparing the first output power with the output power threshold to obtain a comparison result; and adjusting the actual preheating power according to the comparison result.

[0011] In one of the embodiments, a preheating time threshold is determined based on the change rate of the first output power, and the actual preheating power is adjusted based on the preheating time threshold, including: when the change rate of the first output power reaches an initial change rate, the preheating time threshold is determined; and based on the preheating time threshold, the actual preheating power is adjusted so that the sum of the actual preheating power and the second output power of the vehicle power supply is equal to the output power.

[0012] In one of the embodiments, a preheating time threshold is determined based on the change rate of the first output power, and the actual preheating power is adjusted based on the preheating time threshold, including: when the change rate of the first output power reaches the initial change rate, the preheating time threshold is determined; and based on the preheating time threshold, the actual preheating power is adjusted so that the actual preheating power is equal to the estimated preheating power.

[0013] In one of the embodiments, adjusting the actual preheating power according to the comparison result includes: if the first output power of the charging pile is greater than the output power threshold, adjusting the actual preheating power according to the preheating time threshold.

[0014] On the other hand, a device for preheating a vehicle battery is provided, the device comprising:

[0015] A power regulating module, used for obtaining a first output power of the charging pile, and regulating an actual preheating power according to the first output power and a real-time ambient temperature so that the actual preheating power is less than the first output power;

[0016] A battery preheating module is used to preheat the vehicle battery according to the actual preheating power.

[0017] In another aspect, a computer device is provided, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, the following steps are implemented:

[0018] Acquire a first output power of the charging pile, and adjust an actual preheating power according to the first output power and the real-time ambient temperature so that the actual preheating power is less than the first output power;

[0019] The vehicle battery is preheated according to the actual preheating power.

[0020] In another aspect, a computer-readable storage medium is provided, on which a computer program is stored, and when the computer program is executed by a processor, the following steps are implemented:

[0021] Acquire a second output power of the vehicle power supply, and obtain the estimated preheating power according to the first output power and the second output power;

[0022] According to the estimated preheating power and the real-time ambient temperature, the actual preheating power is adjusted so that the actual preheating power is less than or equal to the estimated preheating power.

[0023] The above-mentioned method, device, computer equipment and storage medium for preheating a car battery are applied in a low-temperature environment, where the discharge capacity of the car battery is low and preheating the car battery by external charging is prone to undervoltage. By obtaining the first output power of the external charging pile and the influence of the real-time ambient temperature on the first output power of the external charging pile and the preheating effect of the preheating device, the actual preheating power of the preheating device is adjusted, and the actual preheating power is made less than the first output power, thereby avoiding the undervoltage from affecting the charging stability of the electric vehicle under the premise of preheating the car battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A diagram of an application environment of a method for preheating a vehicle battery in one embodiment;

[0025] Figure 2 A schematic flow chart of a method for preheating a vehicle battery in one embodiment;

[0026] Figure 3 It is a schematic diagram of a process of adjusting the actual preheating power in one embodiment;

[0027] Figure 4 It is a schematic diagram of a process of adjusting the actual preheating power according to the output power threshold in one embodiment;

[0028] Figure 5 It is a schematic diagram of a process for adjusting the actual preheating power in another embodiment;

[0029] Figure 6 It is a schematic diagram of a process of adjusting the actual preheating power according to the change rate in one embodiment;

[0030] Figure 7 A schematic diagram of a process for adjusting the actual preheating power according to the change rate in another embodiment;

[0031] Figure 8 It is a schematic diagram of a process of adjusting the actual preheating power according to the output power threshold in another embodiment;

[0032] Fig. 9 A structural block diagram of a device for preheating a car battery in one embodiment;

[0033] Fig.10 FIG. 4 is a diagram showing the internal structure of a computer device in one embodiment. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0035] The method for preheating a car battery provided in this application can be applied to Figure 1 In the application environment shown. Among them, the terminal 102 communicates with the server 104 through the network. This solution can be applied to low-temperature environments, where the discharge capacity of the car battery is low, and preheating the car battery through external charging is prone to undervoltage. By obtaining the first output power of the external charging pile, and the influence of the real-time ambient temperature on the first output power of the external charging pile and the preheating effect of the preheating device, the actual preheating power of the preheating device is adjusted, and the actual preheating power is made less than the first output power, thereby avoiding the undervoltage affecting the charging stability of the electric vehicle under the premise of preheating the car battery. Among them, the terminal 102 can be but is not limited to various personal computers, laptops, smart phones, tablet computers and portable wearable devices, and the server 104 can be implemented with an independent server or a server cluster composed of multiple servers.

[0036] In one embodiment, Figure 2 As shown, a method for preheating a vehicle battery is provided, and the method is applied to Figure 1 The terminal in is used as an example to illustrate, including the following steps:

[0037] Step 201, obtaining a first output power of the charging pile, and adjusting the actual preheating power according to the first output power and the real-time ambient temperature so that the actual preheating power is less than the first output power;

[0038] Step 202: preheating the vehicle battery according to the actual preheating power.

[0039] The above-mentioned method for preheating a car battery can be applied to low-temperature environments where the discharge capacity of the car battery is low. Preheating the car battery through external charging is prone to undervoltage. By obtaining the first output power of the external charging pile and the influence of the real-time ambient temperature on the first output power of the external charging pile and the preheating effect of the preheating device, the actual preheating power of the preheating device is adjusted, and the actual preheating power is made less than the first output power, thereby avoiding the impact of undervoltage on the charging stability of the electric vehicle on the premise of preheating the car battery.

[0040] In step 201 to step 202, it is exemplified that the first output power of the charging pile is obtained, and the actual preheating power is adjusted according to the first output power and the real-time ambient temperature so that the actual preheating power is less than the first output power. According to the actual preheating power, the vehicle battery is preheated. For example, at present, electric vehicles mainly rely on battery power generation to provide power. The battery can be a lithium battery. The lithium battery mainly relies on the movement of lithium ions between the positive and negative electrodes to work. However, in a low temperature environment, the activity and movement speed of lithium ions are reduced, which will affect the battery's ability to generate electricity, thereby affecting the endurance performance of the electric vehicle. Therefore, in a low temperature environment, the power generation capacity of the vehicle battery can be improved by preheating the vehicle battery. In some implementations, the car battery can be preheated by charging with an external charging pile. Specifically, the first output power of the external charging pile can be used to make the preheating device in the car generate actual preheating power, thereby achieving the effect of preheating the car battery. However, in a low-temperature environment, the charging pile is affected by the low temperature, and the first output power is low. If the actual preheating power during the preheating of the car battery is too large, it is easy to cause undervoltage, thereby causing the charging preheating function of the car battery to be abnormal, and reducing the charging stability of the electric vehicle. Therefore, in order to avoid undervoltage, the actual preheating power of the preheating device can be adjusted according to the first output power of the charging pile and the real-time ambient temperature, so that the actual preheating power is less than the first output power of the charging pile, and the actual preheating power preheats the car battery by generating corresponding heat.

[0041] In another embodiment, the preheating device may be implemented by a positive temperature coefficient (PTC) thermistor.

[0042] In one embodiment, Figure 3As shown, obtaining the first output power of the charging pile, and adjusting the actual preheating power according to the first output power and the real-time ambient temperature so that the actual preheating power is less than the first output power, includes the following steps:

[0043] Step 301, obtaining a second output power of the vehicle power supply, and obtaining an estimated preheating power according to the first output power and the second output power;

[0044] Step 302: adjusting the actual preheating power according to the estimated preheating power and the real-time ambient temperature so that the actual preheating power is less than or equal to the estimated preheating power.

[0045] In step 301, it is exemplified that the second output power of the vehicle power supply is obtained, and the estimated preheating power is obtained according to the first output power and the second output power. For example, in some implementation processes, the electric vehicle can directly obtain the first output power of the charging pile through the electrical signal transmitted from the charging interface. In other implementation processes, the electric vehicle cannot directly obtain the first output power of the charging pile through the electrical signal. In this case, the first output power can be obtained by calculating the current and voltage of the electric vehicle charging interface. The estimated preheating power can be obtained by subtracting the second output power of the vehicle power supply from the first output power. It is worth noting that the estimated preheating power here can be the maximum preheating power of the preheating device obtained after ignoring the power generated by other loads of the electric vehicle.

[0046] In step 302, it is exemplified that the actual preheating power is adjusted according to the estimated preheating power and the real-time ambient temperature so that the actual preheating power is less than or equal to the estimated preheating power. For example, the preheating device may be a PTC. Since the actual preheating power of the PTC may rise sharply or even directly reach the estimated preheating power when the low-temperature preheating is initially performed, and the first output power of the charging pile is relatively small at this time, the estimated preheating power may be greater than the first output power. Therefore, in order to avoid the occurrence of undervoltage, within a certain preheating time threshold, the actual preheating power of the PTC can be controlled to be K1*estimated preheating power, wherein K1 can be adjusted according to the real-time ambient temperature and has a value less than 1. At the same time, since the first output power of the charging pile will gradually stabilize as the temperature of the charging pile rises, the time when the power value of the first output power is stable can be used as the preheating time threshold. When the PTC preheating time is greater than the preheating time threshold, since the first output power has been stable, it is not easy to have an undervoltage situation, so the actual preheating power of the PTC can be equal to the estimated preheating power.

[0047] In one embodiment, Figure 4 As shown, obtaining the first output power of the charging pile, and adjusting the actual preheating power according to the first output power and the real-time ambient temperature so that the actual preheating power is less than the first output power, includes the following steps:

[0048] Step 401, obtaining a first output power of the charging pile, and obtaining a change rate of the first output power according to the first output power and the real-time ambient temperature;

[0049] Step 402: determine a preheating time threshold according to the change rate of the first output power, and adjust the actual preheating power according to the preheating time threshold.

[0050] In step 401, it is exemplarily described that the first output power of the charging pile is obtained, and the change rate of the first output power is obtained according to the first output power and the real-time ambient temperature. For example, in a low temperature environment, the first output power of the charging pile will increase nonlinearly with the temperature of the charging pile until it stabilizes. When the car battery is preheated by PTC, the actual preheating power of PTC may be greater than the first output power and cause undervoltage. Therefore, the actual preheating power of PTC can be controlled by judging the change rate of the first output power of the charging pile.

[0051] In step 402, it is exemplarily explained that according to the change rate of the first output power, the preheating time threshold is determined, and the actual preheating power is adjusted according to the preheating time threshold. For example, the change of the first output power of the charging pile may include three stages, namely, a sharp rise stage, a stabilizing stage and a stable stage. Therefore, according to these three stages, the change rate of the first output power can be divided into three categories, and the preheating time threshold is determined according to the change rate of each category. For example, in the sharp rise stage, the change rate of the first output power is a1, and the preheating time threshold is t1. In the stabilizing stage, the change rate of the first output power is a2, and the preheating time threshold is t2. In the stable stage, the change rate of the first output power is a3, and the preheating time threshold is t3. Accordingly, when the actual preheating time is less than t1, the preheating time threshold is adjusted. The actual preheating power is equal to K2*the first output power; when the actual preheating time is greater than or equal to t1 and less than t2, the actual preheating power is adjusted to be equal to K3*the first output power; when the actual preheating time is greater than or equal to t2, the second output power of the vehicle power supply may be considered when adjusting the actual preheating power, so that the actual preheating power and the second output power are less than or equal to the first output power. In some implementations, the sum of the actual preheating power and the second output power may be equal to the first output power, and in the sharp rise stage and the stable stage, since the adjusted actual preheating power is lower and the sum of the second output power is less than the first output power, the second output power of the vehicle power supply does not need to be particularly considered. In this implementation, it is also worth noting that K2 and K3 are both less than 1, and K2 is less than K3.

[0052] In one embodiment, Figure 5As shown, obtaining the first output power of the charging pile, and adjusting the actual preheating power according to the first output power and the real-time ambient temperature so that the actual preheating power is less than the first output power, includes the following steps:

[0053] Step 501, obtaining an estimated preheating power under low-temperature preheating, and determining an output power threshold of the charging pile according to the estimated preheating power;

[0054] Step 502, obtaining a first output power of the charging pile, comparing the first output power with an output power threshold, and obtaining a comparison result;

[0055] Step 503: adjust the actual preheating power according to the comparison result.

[0056] In step 501, it is exemplarily described that an estimated preheating power under low-temperature preheating is obtained, and the output power threshold of the charging pile is determined based on the estimated preheating power. For example, in some implementation processes, the preheating device may be a PTC. When the PTC is initially preheated, the actual preheating power of the PTC may increase sharply, and may even directly reach the maximum actual preheating power. Therefore, in order to avoid the situation in which the first output power of the charging pile is less than the actual preheating power and undervoltage occurs in this case, the estimated preheating power of the PTC can be obtained based on the characteristic that the actual preheating power of the PTC under low-temperature preheating varies with temperature. In some implementation processes, the estimated preheating power may be the maximum actual preheating power. The output power threshold of the charging pile is determined based on the estimated preheating power. In some implementation processes, the output power threshold may be equal to the maximum actual preheating power.

[0057] In step 502 to step 503, it is exemplarily explained that the first output power of the charging pile is obtained, the first output power is compared with the output power threshold, and a comparison result is obtained. For example, in order to avoid undervoltage during initial low-temperature preheating, the first output power of the charging pile can be compared with the output power threshold. Since the output power threshold is determined based on the estimated preheating power, when the first output power is less than the output power threshold, the actual preheating power can be adjusted to 0 to ensure that undervoltage does not occur. When the first output power is greater than the output power threshold, the preheating time threshold can be determined to ensure that undervoltage does not occur. Specifically, in the sharp rise stage, the change rate of the first output power is a1, and the preheating time threshold is t1. In the stabilizing stage, the change rate of the first output power is a2, and the preheating time threshold is t2. In the stabilizing stage, the change rate of the first output power is a3, and the preheating time threshold is t4. The preheating time threshold is t3, and accordingly, when the actual preheating time is less than t1, the actual preheating power is adjusted to be equal to K2*the first output power; when the actual preheating time is greater than or equal to t1 and less than t2, the actual preheating power is adjusted to be equal to K3*the first output power; when the actual preheating time is greater than or equal to t2, the second output power of the vehicle power supply may be considered when adjusting the actual preheating power, so that the actual preheating power and the second output power are less than or equal to the first output power. In some implementations, the sum of the actual preheating power and the second output power may be equal to the first output power, and in the sharp rise stage and the stable stage, since the adjusted actual preheating power is lower and the sum of the second output power is less than the first output power, the second output power of the vehicle power supply does not need to be particularly considered. In this implementation, it is also worth noting that K2 and K3 are both less than 1, and K2 is less than K3.

[0058] In one embodiment, Figure 6 As shown, determining a preheating time threshold according to a change rate of the first output power, and adjusting the actual preheating power according to the preheating time threshold includes:

[0059] Step 601, when the change rate of the first output power reaches the initial change rate, determining a preheating time threshold;

[0060] Step 602: adjusting the actual preheating power according to the preheating time threshold so that the sum of the actual preheating power and the second output power of the vehicle power supply is equal to the output power.

[0061] In step 601, it is exemplarily explained that when the rate of change of the first output power reaches the initial rate of change, the preheating time threshold is determined. For example, in a low temperature environment, the first output power of the charging pile will rise nonlinearly with the temperature of the charging pile until it stabilizes. When the car battery is preheated by PTC, the actual preheating power of the PTC may be greater than the first output power, causing undervoltage. Therefore, the actual preheating power of the PTC can be controlled by judging the rate of change of the first output power of the charging pile. When the first output power is stable, that is, the rate of change of the first output power reaches the initial rate of change, where the initial rate of change can be 0, the actual preheating time used to reach the initial rate of change can be used as the preheating time threshold, and the actual preheating power is adjusted according to the preheating time threshold.

[0062] In step 602, it is exemplarily explained that, according to the preheating time threshold, the actual preheating power is adjusted so that the sum of the actual preheating power and the second output power of the vehicle power supply is equal to the output power. For example, since the first output power has reached stability, the second output power of the vehicle power supply can be considered so that the actual preheating power and the second output power are less than or equal to the first output power. In some implementations, the sum of the actual preheating power and the second output power can be equal to the first output power, while in the sharp rise stage and the stable stage, since the adjusted actual preheating power is lower, the sum of the actual preheating power and the second output power is less than the first output power.

[0063] In one embodiment, Figure 7 As shown, determining a preheating time threshold according to a change rate of the first output power, and adjusting the actual preheating power according to the preheating time threshold includes:

[0064] Step 701, when the change rate of the first output power reaches the initial change rate, determining a preheating time threshold;

[0065] Step 702: adjusting the actual preheating power according to the preheating time threshold so that the actual preheating power is equal to the estimated preheating power.

[0066] In step 701, it is exemplarily explained that when the rate of change of the first output power reaches the initial rate of change, the preheating time threshold is determined. For example, in some implementation processes, the electric vehicle cannot directly obtain the first output power of the charging pile through the electrical signal. At this time, the first output power can be obtained by calculating the current and voltage of the electric vehicle charging interface. The estimated preheating power can be obtained by subtracting the second output power of the vehicle power supply from the first output power. It is worth noting that the estimated preheating power here can be the maximum preheating power of the preheating device obtained after ignoring the power generated by other loads of the electric vehicle. When the rate of change of the first output power reaches the initial rate of change, the first output power has stabilized. At this time, the actual preheating time used can be used as the preheating time threshold t4.

[0067] In step 702, it is exemplarily explained that according to the preheating time threshold, the actual preheating power is adjusted so that the actual preheating power is equal to the estimated preheating power. For example, when the actual preheating time is greater than or equal to the preheating time threshold t4, the actual preheating power can be adjusted to the estimated preheating power. At this time, since the first output power has reached stability, that is, the maximum output power, undervoltage can be avoided.

[0068] In one embodiment, Figure 8 As shown, according to the comparison results, the actual preheating power is adjusted, including:

[0069] Step 801: If the first output power of the charging pile is greater than the output power threshold, the actual preheating power is adjusted according to the preheating time threshold.

[0070] In step 801, it is exemplified that if the first output power of the charging pile is greater than the output power threshold, the actual preheating power is adjusted according to the preheating time threshold. For example, when the first output power is greater than the estimated preheating power, the preheating time threshold can be determined to ensure that undervoltage does not occur. Specifically, in the sharp rise stage, the change rate of the first output power is a1, and the preheating time threshold is t1. In the stable stage, the change rate of the first output power is a2, and the preheating time threshold is t2. In the stable stage, the change rate of the first output power is a3, and the preheating time threshold is t3. Accordingly, when the actual preheating time is less than t1, the actual preheating power is adjusted to be equal to K2*the first output power; when the actual preheating time is greater than t1, the actual preheating power is adjusted to be equal to K2*the first output power; when the actual preheating time is greater than or equal to t1, and less than t2, adjust the actual preheating power to be equal to K3*the first output power; when the actual preheating time is greater than or equal to t2, the second output power of the car power supply may be considered when adjusting the actual preheating power, so that the actual preheating power and the second output power are less than or equal to the first output power. In some implementations, the sum of the actual preheating power and the second output power may be equal to the first output power, and in the sharp rise stage and the stable stage, since the adjusted actual preheating power is lower and the sum of the second output power is less than the first output power, the second output power of the car power supply does not need to be specially considered. In this implementation, it is also worth noting that K2 and K3 are both less than 1, and K2 is less than K3.

[0071] It should be understood that although Figure 2-8 The steps in the flowchart are shown in sequence as indicated by the arrows, but these steps are not necessarily executed in the order indicated by the arrows. Unless otherwise specified in this document, there is no strict order restriction for the execution of these steps, and these steps can be executed in other orders. Moreover, Figure 2-8At least part of the steps may include multiple sub-steps or multiple stages. These sub-steps or stages are not necessarily executed at the same time, but can be executed at different times. The execution order of these sub-steps or stages is not necessarily sequential, but can be executed in turn or alternately with other steps or at least part of the sub-steps or stages of other steps.

[0072] In one embodiment, Fig. 9 As shown, a device for preheating a car battery is provided, comprising: a power regulating module, a battery preheating module, wherein:

[0073] A power adjustment module, used to obtain a first output power of the charging pile, and adjust the actual preheating power according to the first output power and the real-time ambient temperature so that the actual preheating power is less than the first output power;

[0074] The battery preheating module is used to preheat the vehicle battery according to the actual preheating power.

[0075] Optionally, the power regulation module is also used to obtain a second output power of the vehicle power supply, and obtain an estimated preheating power based on the first output power and the second output power; and adjust the actual preheating power based on the estimated preheating power and the real-time ambient temperature so that the actual preheating power is less than or equal to the estimated preheating power.

[0076] Optionally, the power regulation module is also used to obtain the first output power of the charging pile, and obtain the change rate of the first output power based on the first output power and the real-time ambient temperature; determine the preheating time threshold based on the change rate of the first output power, and adjust the actual preheating power according to the preheating time threshold.

[0077] Optionally, the power regulation module is also used to obtain the estimated preheating power under low-temperature preheating, and determine the output power threshold of the charging pile based on the estimated preheating power; obtain the first output power of the charging pile, compare the first output power with the output power threshold, and obtain a comparison result; and adjust the actual preheating power based on the comparison result.

[0078] Optionally, the power regulation module is also used to determine a preheating time threshold when the change rate of the first output power reaches an initial change rate; and adjust the actual preheating power according to the preheating time threshold so that the sum of the actual preheating power and the second output power of the vehicle power supply is equal to the output power.

[0079] Optionally, the power regulation module is also used to determine a preheating time threshold when the change rate of the first output power reaches an initial change rate; and adjust the actual preheating power according to the preheating time threshold so that the actual preheating power is equal to the estimated preheating power.

[0080] Optionally, the power regulation module is further used to adjust the actual preheating power according to the preheating time threshold if the first output power of the charging pile is greater than the output power threshold.

[0081] The specific definition of the vehicle battery preheating device can be found in the definition of the vehicle battery preheating method above, which will not be repeated here. Each module in the above-mentioned vehicle battery preheating device can be implemented in whole or in part by software, hardware and a combination thereof. The above-mentioned modules can be embedded in or independent of the processor in the computer device in the form of hardware, or can be stored in the memory of the computer device in the form of software, so that the processor can call and execute the operations corresponding to the above modules.

[0082] In one embodiment, a computer device is provided. The computer device may be a terminal, and its internal structure diagram may be as follows: Fig.10 As shown. The computer device includes a processor, a memory, a network interface, a display screen and an input device connected through a system bus. Among them, the processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The network interface of the computer device is used to communicate with an external terminal through a network connection. When the computer program is executed by the processor, a method for preheating a car battery is implemented. The display screen of the computer device can be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer device can be a touch layer covering the display screen, or a key, trackball or touchpad set on the computer device housing, or an external keyboard, touchpad or mouse, etc.

[0083] Those skilled in the art will understand that Fig.10 The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components.

[0084] In one embodiment, a computer device is provided, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the following steps when executing the computer program:

[0085] Obtaining a first output power of the charging pile, and adjusting the actual preheating power according to the first output power and the real-time ambient temperature so that the actual preheating power is less than the first output power;

[0086] Preheat the car battery according to the actual preheating power.

[0087] In one embodiment, when the processor executes the computer program, the following steps are also implemented:

[0088] Obtaining a second output power of the vehicle power supply, and obtaining an estimated preheating power according to the first output power and the second output power;

[0089] According to the estimated preheating power and the real-time ambient temperature, the actual preheating power is adjusted so that the actual preheating power is less than or equal to the estimated preheating power.

[0090] In one embodiment, when the processor executes the computer program, the following steps are also implemented:

[0091] Obtaining a first output power of the charging pile, and obtaining a change rate of the first output power according to the first output power and the real-time ambient temperature;

[0092] A preheating time threshold is determined according to the change rate of the first output power, and the actual preheating power is adjusted according to the preheating time threshold.

[0093] In one embodiment, when the processor executes the computer program, the following steps are also implemented:

[0094] Obtain the estimated preheating power under low-temperature preheating, and determine the output power threshold of the charging pile according to the estimated preheating power;

[0095] Obtaining a first output power of the charging pile, comparing the first output power with an output power threshold, and obtaining a comparison result;

[0096] According to the comparison results, adjust the actual preheating power.

[0097] In one embodiment, when the processor executes the computer program, the following steps are also implemented:

[0098] When the change rate of the first output power reaches the initial change rate, determining a preheating time threshold;

[0099] According to the preheating time threshold, the actual preheating power is adjusted so that the sum of the actual preheating power and the second output power of the vehicle power supply is equal to the output power.

[0100] In one embodiment, when the processor executes the computer program, the following steps are also implemented:

[0101] When the change rate of the first output power reaches the initial change rate, determining a preheating time threshold;

[0102] According to the preheating time threshold, the actual preheating power is adjusted so that the actual preheating power is equal to the estimated preheating power.

[0103] In one embodiment, when the processor executes the computer program, the following steps are also implemented:

[0104] If the first output power of the charging pile is greater than the output power threshold, the actual preheating power is adjusted according to the preheating time threshold.

[0105] In one embodiment, a computer readable storage medium is provided, on which a computer program is stored, and when the computer program is executed by a processor, the following steps are implemented:

[0106] Obtaining a first output power of the charging pile, and adjusting the actual preheating power according to the first output power and the real-time ambient temperature so that the actual preheating power is less than the first output power;

[0107] Preheat the car battery according to the actual preheating power.

[0108] In one embodiment, when the computer program is executed by a processor, the following steps are also implemented:

[0109] Obtaining a second output power of the vehicle power supply, and obtaining an estimated preheating power according to the first output power and the second output power;

[0110] According to the estimated preheating power and the real-time ambient temperature, the actual preheating power is adjusted so that the actual preheating power is less than or equal to the estimated preheating power.

[0111] In one embodiment, when the computer program is executed by a processor, the following steps are also implemented:

[0112] Obtaining a first output power of the charging pile, and obtaining a change rate of the first output power according to the first output power and the real-time ambient temperature;

[0113] A preheating time threshold is determined according to the change rate of the first output power, and the actual preheating power is adjusted according to the preheating time threshold.

[0114] In one embodiment, when the computer program is executed by a processor, the following steps are also implemented:

[0115] Obtain the estimated preheating power under low-temperature preheating, and determine the output power threshold of the charging pile according to the estimated preheating power;

[0116] Obtaining a first output power of the charging pile, comparing the first output power with an output power threshold, and obtaining a comparison result;

[0117] According to the comparison results, adjust the actual preheating power.

[0118] In one embodiment, when the computer program is executed by a processor, the following steps are also implemented:

[0119] When the change rate of the first output power reaches the initial change rate, determining a preheating time threshold;

[0120] According to the preheating time threshold, the actual preheating power is adjusted so that the sum of the actual preheating power and the second output power of the vehicle power supply is equal to the output power.

[0121] In one embodiment, when the computer program is executed by a processor, the following steps are also implemented:

[0122] When the change rate of the first output power reaches the initial change rate, determining a preheating time threshold;

[0123] According to the preheating time threshold, the actual preheating power is adjusted so that the actual preheating power is equal to the estimated preheating power.

[0124] In one embodiment, when the computer program is executed by a processor, the following steps are also implemented:

[0125] If the first output power of the charging pile is greater than the output power threshold, the actual preheating power is adjusted according to the preheating time threshold.

[0126] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to memory, storage, database or other media used in the embodiments provided in this application can include non-volatile and / or volatile memory. Non-volatile memory can include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM) or flash memory. Volatile memory can include random access memory (RAM) or external cache memory. As an illustration and not limitation, RAM is available in many forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link (Synchlink) DRAM (SLDRAM), memory bus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).

[0127] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0128] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.

Claims

1. A method for preheating a vehicle battery, characterized in that: include: Obtaining a first output power of the charging pile and obtaining a second output power of the vehicle power supply; adjusting the actual preheating power so that the actual preheating power is less than the first output power; preheating the vehicle battery according to the actual preheating power; The method of adjusting the actual preheating power includes the following first strategy: Obtaining an estimated preheating power according to the first output power and the second output power, wherein the estimated preheating power is a difference between the first output power and the second output power; The time for which the power value of the first output power is stable is used as a preheating time threshold; If the preheating time is less than or equal to the preheating time threshold, the actual preheating power is adjusted to be the product of K1 and the estimated preheating power, K1 is adjusted according to the real-time ambient temperature, and K1 is less than 1; If the preheating time is greater than the preheating time threshold, adjusting the actual preheating power so that the actual preheating power is equal to the estimated preheating power; or, The method for adjusting the actual preheating power includes the second strategy: Obtaining a change rate of the first output power according to the first output power and the real-time ambient temperature; determining a preheating time threshold according to the change rate; If the change rate indicates that the first output power rises sharply, the preheating time threshold is t1, and when the actual preheating time is less than t1, the actual preheating power is adjusted to be the product of K2 and the first output power; If the change rate indicates that the first output power tends to be stable, the preheating time threshold is t2, and when the actual preheating time is greater than or equal to t1 and less than t2, the actual preheating power is adjusted to be the product of K3 and the first output power; If the change rate indicates that the first output power is stable, the preheating time threshold is t3, and when the actual preheating time is greater than or equal to t2, the actual preheating power is adjusted so that the sum of the actual preheating power and the second output power is the first output power; Among them, K2 and K3 are both less than 1, and K2 is less than K3.

2. The method for preheating a vehicle battery as claimed in claim 1, characterized in that: Before adjusting the actual preheating power, the method further includes: Determining the estimated preheating power under low-temperature preheating according to the characteristic of the actual preheating power varying with temperature; Determining an output power threshold of the charging pile according to the estimated preheating power under the low-temperature preheating; Comparing the first output power with the output power threshold to obtain a comparison result; The adjusting the actual preheating power comprises: If the comparison result indicates that the first output power is less than the output power threshold, adjusting the actual preheating power to 0; If the comparison result indicates that the first output power is greater than the output power threshold, the second strategy is executed.

3. The method for preheating a vehicle battery as claimed in claim 2, characterized in that: The estimated preheating power under the low-temperature preheating is the maximum actual preheating power; and / or, The output power threshold is the maximum actual preheating power.

4. The method for preheating a vehicle battery as claimed in claim 1, characterized in that: The first output power is calculated based on the current and voltage of the vehicle charging interface.

5. A device for preheating a car battery, characterized in that: The method for implementing any one of claims 1 to 4 comprises: A power regulating module, used to obtain a first output power of the charging pile, obtain a second output power of the vehicle power supply, and regulate the actual preheating power so that the actual preheating power is less than the first output power; A battery preheating module is used to preheat the vehicle battery according to the actual preheating power.

6. A computer device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 4 are implemented.

7. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 4 are implemented.

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