A power battery charging method, device and vehicle

Abstract

The application relates to the technical field of automobiles and provides a power battery charging method and device and a vehicle. The method comprises the following steps: acquiring state parameters of a power battery in real time, the state parameters comprising a power battery discharge power, a power battery temperature or a power battery residual capacity; determining a current charging stage of the power battery based on the power battery temperature or the power battery residual capacity, the current charging stage being a power battery heating stage or a power battery charging stage; and if the power battery is in the power battery charging stage, closing one or more of vehicle thermal management accessories based on the power battery discharge power, wherein the vehicle thermal management accessories comprise a direct-current converter, an air conditioner thermal management system accessory and a power battery thermal management system accessory. According to the residual use time of the power battery, one or more vehicle thermal management accessories can be closed, so that the power battery can be prevented from facing the risk of overcurrent when the power battery is in the power battery charging stage.

Description

Technical Field

[0001] This application relates to the field of automotive technology, and in particular to a power battery charging method, device, and vehicle. Background Technology

[0002] In the existing technology, electric vehicles include pure electric vehicles or hybrid electric vehicles. During the charging process of the electric vehicle's power battery, if the power battery temperature is low, or the power battery's SOC (State of Charge) is low, i.e., the power battery's peak power is extremely low and it has no discharge capacity or a low discharge capacity, then the vehicle's thermal management accessories are restricted.

[0003] However, when limiting vehicle thermal management accessories, the lack of overall consistency in the limiting conditions can easily lead to overcurrent risks, causing vehicle malfunctions and resulting in charging failures. For example, if the output current of the power battery is limited to 1A and the current required by the DC-DC converter is 1.2A, the power battery will ignore the limit and supply current to the DC-DC converter, causing overcurrent in the power battery, leading to vehicle malfunctions and charging failures. Summary of the Invention

[0004] In view of this, embodiments of this application provide a power battery charging method, apparatus, and vehicle to solve the problem in the prior art that the power battery cannot be charged when its discharge capacity is insufficient.

[0005] A first aspect of this application provides a method for charging a power battery, including:

[0006] The status parameters of the power battery are acquired in real time. These status parameters include the power battery discharge power, as well as the power battery temperature or the remaining power battery charge. The power battery discharge power is used to characterize the remaining usage time of the power battery.

[0007] Based on the power battery temperature or the remaining power battery charge, determine the current charging stage of the power battery, which may be either the power battery heating stage or the power battery charging stage.

[0008] If the power battery is in the power battery charging stage, one or more of the vehicle thermal management accessories will be turned off based on the power battery discharge power. The vehicle thermal management accessories include the DC-DC converter, the air conditioning thermal management system accessory, and the power battery thermal management system accessory.

[0009] A second aspect of this application provides a power battery charging device, comprising:

[0010] The acquisition module is configured to acquire the status parameters of the power battery in real time. The status parameters include the power battery discharge power, as well as the power battery temperature or the remaining power battery charge. The power battery discharge power is used to characterize the remaining usage time of the power battery.

[0011] The determination module is configured to determine the current charging stage of the power battery based on the power battery temperature or the remaining power battery charge. The current charging stage is either the power battery heating stage or the power battery charging stage.

[0012] The processing module is configured to shut down one or more of the vehicle thermal management accessories based on the power battery discharge power if the power battery is in the power battery charging stage. The vehicle thermal management accessories include the DC-DC converter, the air conditioning thermal management system accessory, and the power battery thermal management system accessory.

[0013] A third aspect of this application provides a vehicle that includes a vehicle controller for implementing the steps of the above-described method.

[0014] The beneficial effects of this application's embodiments compared to the prior art are as follows: The power battery charging method involved in this application acquires the power battery's state parameters in real time. These state parameters include the power battery's discharge power, temperature, and remaining charge. The remaining usage time of the power battery can be determined by the power battery's discharge power and temperature, or its discharge power and remaining charge, thus characterizing the power battery's remaining capacity. The current charging stage of the power battery includes a heating stage and a charging stage. The current charging stage is determined based on the power battery's temperature or remaining charge. If the power battery is in the charging stage, one or more of the vehicle's thermal management accessories are shut down based on the power battery's discharge power. Through the power battery charging method provided in this application, the normal operation of the power battery can be prioritized by shutting down one or more vehicle thermal management accessories based on the remaining usage time of the power battery. This avoids the overcurrent risk that the power battery may face during the charging stage, thereby ensuring the charging safety of the power battery and the safety of the vehicle. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic flowchart of a power battery charging method provided in an embodiment of this application;

[0017] Figure 2 This is a schematic diagram of a power battery charging device provided in an embodiment of this application;

[0018] Figure 3 This is a schematic diagram of the electronic device provided in the embodiments of this application. Detailed Implementation

[0019] In the following description, specific details such as particular system architectures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of this application. However, those skilled in the art will understand that this application may also be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods have been omitted so as not to obscure the description of this application with unnecessary detail.

[0020] A power battery charging method and apparatus according to embodiments of this application will now be described in detail with reference to the accompanying drawings.

[0021] Electric vehicles (hereinafter also referred to as vehicles) include a VCU (Vehicle Control Unit). The VCU is the core control component of the entire vehicle, capable of collecting signals from various components within the vehicle, making judgments, and controlling the actions of lower-level component controllers. The VCU can control and manage the overall energy source status and vehicle accessories of the vehicle to coordinate vehicle power output and achieve optimized energy utilization and overall vehicle requirements. The state parameters of the power battery and the shutdown of one or more vehicle thermal management accessories based on these state parameters, as discussed in this application, are all controlled by the VCU.

[0022] Figure 1 This is a schematic flowchart of a power battery charging method provided in an embodiment of this application. Figure 1 The charging method for the power battery can be executed by the vehicle controller of the electric vehicle. For example... Figure 1 As shown, the power battery charging method includes the following steps:

[0023] S101, real-time acquisition of power battery status parameters;

[0024] S102, determine the current charging stage of the power battery based on the power battery temperature or the remaining power battery charge;

[0025] S103 If the power battery is in the power battery charging stage, then based on the power battery discharge power, shut down one or more of the vehicle thermal management accessories.

[0026] In step S101, the state parameters include the power battery discharge power, as well as the power battery temperature or the remaining power battery charge. The power battery discharge power is used to characterize the remaining usage time of the power battery. It is a parameter representing the power battery's capability and is independent of whether the power battery is in a discharge state.

[0027] In some embodiments, the discharge power of a power battery is affected by several factors during discharge, including battery temperature, battery SOC (State of Charge), battery malfunctions, and undervoltage. When the battery's basic functions are normal, if the battery SOC or temperature drops to a preset threshold, the battery's discharge power will decrease to zero, limiting its discharge capacity and preventing normal charging.

[0028] In step S102, the current charging stage of the power battery is determined based on the power battery temperature. The current charging stage is either the power battery heating stage or the power battery charging stage. Alternatively, the current charging stage of the power battery is determined based on the power battery's state of charge (SOC). The current charging stage is the power battery charging stage.

[0029] In some embodiments, during the current charging phase, the energy of the power battery comes from the charging pile and the output of the power battery. If the temperature of the power battery decreases or the SOC of the power battery decreases, the discharge power of the power battery will also decrease, possibly to 0.

[0030] In step S103, the vehicle thermal management accessories include the following three types:

[0031] A DC-DC converter is a device that converts a DC power supply of one voltage level to a DC power supply of another voltage level.

[0032] The air conditioning thermal management system accessory CCU (Compressor-condenser unit, used for variable displacement compressors) is used to control the air conditioning;

[0033] The resistance of the PTC (Positive Temperature Coefficient) thermistor, an accessory in the battery thermal management system, increases in a stepwise manner with the increase of the PTC thermistor's body temperature; the higher the temperature, the greater the resistance. In a vehicle, there are at least two PTCs, one located inside the power battery and the other inside the passenger compartment, used to determine the temperature state of the power battery and the passenger compartment, respectively.

[0034] In some embodiments, if it is determined that the power battery is in the power battery charging stage, then according to the power battery discharge power, one or more of the vehicle thermal management accessories are turned off. This may be to not turn off the vehicle thermal management accessories, to turn off the CCU in the vehicle thermal management accessories, to turn off the CCU and PTC in the vehicle thermal management accessories, to turn off the CCU and PTC in the vehicle thermal management accessories and reduce the power of the DC / DC converter, or to turn off the CCU, PTC and DC / DC converter in the vehicle thermal management accessories.

[0035] The power battery charging method provided in this application confirms the remaining usage time of the power battery by using either the power battery discharge power and the power battery temperature, or the power battery discharge power and the remaining power battery charge. It also determines the method for turning off the vehicle's thermal management accessories to ensure that the power battery can operate normally and avoid overcurrent risks.

[0036] In some embodiments, based on the power battery discharge power, shutting down one or more of the vehicle thermal management accessories includes:

[0037] Based on the power battery discharge power, determine the level corresponding to the power battery discharge power, and close the vehicle thermal management accessories within the corresponding limit range of the level.

[0038] The power battery charging method provided in this application divides the power battery discharge power into multiple levels, and the vehicle thermal management accessories within the corresponding limit range of each level are different, so as to ensure normal charging when the power battery discharge power is low.

[0039] In some embodiments, determining the current charging stage of the power battery before shutting down one or more of the vehicle thermal management accessories, based on the power battery discharge power, includes:

[0040] If the power battery temperature is not higher than the minimum temperature, then the power battery is determined to be in the power battery heating stage. The minimum temperature is the minimum temperature required for the power battery to be charged.

[0041] If the power battery temperature is higher than the minimum temperature, then the power battery is determined to be in the power battery charging stage.

[0042] In an exemplary embodiment of this application, taking a minimum temperature of -20°C as an example, if the power battery temperature is less than or equal to -20°C, the power battery is in the power battery heating stage, requiring heating. During heating, the main positive relay of the BMS (Battery Management System) is disconnected, and the heating energy comes from the energy output of the charging pile. This power battery heating stage is also called the pre-charging thermal management stage. If the power battery temperature is greater than -20°C, the power battery is in the power battery charging stage.

[0043] If the temperature of the power battery drops to -20°C or below during the charging phase, the current charging phase of the power battery will be converted into the heating phase until the temperature of the power battery is above -20°C.

[0044] The power battery charging method provided in this application divides the current charging stage of the power battery into a power battery heating stage and a power battery charging stage according to the temperature of the power battery. This allows for a better assessment of the current state of the power battery, enabling further closure of the vehicle thermal management accessories within the corresponding limit range.

[0045] In some embodiments, based on the power battery discharge power, a level corresponding to the power battery discharge power is determined, and vehicle thermal management accessories within the corresponding range of the level are turned off, including:

[0046] If the power battery discharge power is at the first level, control all vehicle thermal management accessories to remain in the current state;

[0047] If the power battery discharge power is at the second level, turn off the air conditioning thermal management accessory;

[0048] If the power battery discharge power is at level three, turn off the air conditioning thermal management accessory and the power battery thermal management accessory.

[0049] If the power battery discharge power is at level four, turn off the air conditioning thermal management accessory and the power battery thermal management accessory, and reduce the power of the DC converter according to the preset percentage;

[0050] If the power battery discharge power is zero, turn off all vehicle thermal management accessories;

[0051] The first level is when the power battery discharge power is greater than the first power threshold; the second level is when the power battery discharge power is greater than the second power threshold but not greater than the first power threshold; the third level is when the power battery discharge power is greater than the third power threshold but not greater than the second power threshold; and the fourth level is when the power battery discharge power is greater than the fourth power threshold but not greater than the third power threshold. The first power threshold is greater than the second power threshold, the second power threshold is greater than the third power threshold, and the third power threshold is greater than the fourth power threshold.

[0052] In an exemplary embodiment of this application, the discharge power of the power battery is represented by P, and the first power threshold, second power threshold, third power threshold, and fourth power threshold are represented by P1, P2, P3, and P4, respectively. When the discharge power of the power battery is at the first level, i.e., P>P1, the vehicle can meet the consumption of DC / DC converter, power battery PTC heating, and CCU, where P1 = P e +i d *ud +P a -i0*u0。

[0053] Where P e is the maximum heating power of the power battery PTC, i d is the DC / DC input current, u d is the DC / DC input voltage, i0 is the output current of the charging pile, and u0 is the output voltage of the charging pile.

[0054] When the discharge power of the power battery is at the second level, that is, P2 < P ≤ P1, the consumption of the CCU is turned off, and the consumption of the vehicle DC / DC and the power battery PTC heating are preferentially ensured. Where P2 = P e +i d *u d -i0*u0。

[0055] When the discharge power of the power battery is at the third level, that is, P3 < P ≤ P2, the consumption of the CCU and the power battery PTC heating are turned off, and the vehicle DC / DC is preferentially ensured. Where P3 = (i d *α + 1)*u d -i0*u0。

[0056] Where α is the overcurrent coefficient of the BMS, and there is a corresponding relationship between P and α. The corresponding relationship is: a preset look-up table between α and P. According to the preset look-up table, a value of α greater than 1 can be selected.

[0057] When the discharge power of the power battery is at the fourth level, that is, P4 < P ≤ P3, the consumption of the CCU and the power battery PTC heating are turned off, and the consumption power of the vehicle DC / DC is reduced to 75% to avoid the vehicle being unable to charge due to BMS overcurrent. The value of P4 is taken as 0 or a value close to 0. When the discharge power of the power battery is close to 0, the consumption power of the DC / DC is limited;

[0058] When the discharge power P of the power battery is not greater than P4, that is, P ≤ P4, the consumption of the CCU, the power battery PTC heating, and the vehicle DC / DC are turned off, where P1 > P2 > P3 > P4 ≥ 0.

[0059] In the power battery charging method provided by this application, grading is performed according to the discharge power of the power battery, and different vehicle thermal management accessories are respectively turned off at each level to preferentially ensure the consumption of the vehicle DC / DC, maximize the avoidance of overcurrent events, and ensure the charging safety of the power battery.

[0060] In some embodiments, it further includes:

[0061] Monitor the power battery discharge power. When the power battery discharge power is at level 3, level 2, or level 1, activate the vehicle thermal management accessories outside the corresponding limit range based on the level.

[0062] In an exemplary embodiment of this application, the discharge power of the power battery is monitored. When the discharge power P > P3, the vehicle's DC / DC converter is enabled. As the discharge power and temperature of the power battery increase, the power battery heating phase transforms into a power battery charging phase. The internal charging path of the power battery also participates in energy output, contributing to the vehicle's thermal management accessories and the power battery's energy consumption. In other words, as the level increases, vehicle thermal management accessories outside the corresponding limit range of that level are activated.

[0063] When the power battery is in the power battery heating stage, the main positive relay is not engaged, and only the energy output of the charging pile is in the power battery. As the power discharge power and the power battery temperature increase, the main positive relay is engaged, and the internal charging path of the power battery participates in the energy output.

[0064] The power battery charging method provided in this application can gradually restore the working state of the vehicle's thermal management accessories as the power battery discharge power and power battery temperature increase, providing a flexible charging solution.

[0065] In some embodiments, determining the current charging stage of the power battery before shutting down one or more of the vehicle thermal management accessories, based on the power battery discharge power, includes:

[0066] Based on a preset time period, the discharge power of the power battery is monitored. When the discharge power of the power battery continues to decrease, it is determined that the discharge power of the power battery is in a state of continuous decrease.

[0067] If the power battery discharge power corresponding to the remaining power of the power battery is continuously decreasing, then the power battery is determined to be in the power battery charging stage.

[0068] When the remaining charge of the power battery is low, the discharge power of the power battery decreases as the remaining charge decreases, resulting in the discharge power of the power battery gradually decreasing to 0.

[0069] According to the preset time period, the discharge power of the power battery is monitored. When the discharge power of the power battery continues to decrease, it is determined that the discharge power of the power battery is in a state of continuous decrease, thus determining that the power battery is in the charging stage. The energy for charging the power battery comes from the charging pile and the output of the power battery.

[0070] Specifically, based on a preset time period, it is determined that the power battery discharge power is in a continuously decreasing state. This is achieved by recording the power battery discharge power in each period. When the power battery is in the nth time period, and its discharge power is lower than that in the (n-1)th time period, and its discharge power in the (n-1)th time period is lower than that in the (n-2)th time period, then it is determined that the power battery discharge power is in a continuously decreasing state.

[0071] The power battery charging method provided in this application can determine whether the power battery is in the charging stage based on the remaining power battery capacity and the power battery discharge power, ensuring normal charging when the remaining power battery capacity is low.

[0072] In some embodiments, based on the power battery discharge power, a level corresponding to the power battery discharge power is determined, and vehicle thermal management accessories within the corresponding limit range of the level are turned off, including:

[0073] If the power battery discharge power is at level 5, control all vehicle thermal management accessories and the internal charging path of the power battery to remain in the current state.

[0074] If the power battery discharge power is at level six, disconnect the internal charging path of the power battery.

[0075] If the power battery discharge power is at level seven, disconnect the internal charging path of the power battery and turn off the air conditioning thermal management accessories and the power battery thermal management accessories.

[0076] If the power battery discharge power is at level eight, disconnect the internal charging path of the power battery, turn off the air conditioning thermal management accessory and the power battery thermal management accessory, and reduce the power of the DC converter according to the preset percentage.

[0077] If the power battery discharge power is zero, disconnect the internal charging path of the power battery and turn off all vehicle thermal management accessories;

[0078] Among them, the fifth level is when the power battery discharge power is greater than the fifth power threshold, the sixth level is when the power battery discharge power is greater than the sixth power threshold but not greater than the fifth power threshold, the seventh level is when the power battery discharge power is greater than the seventh power threshold but not greater than the sixth power threshold, and the eighth level is when the power battery discharge power is greater than the eighth power threshold but not greater than the seventh power threshold. Among these, the fifth power threshold is greater than the sixth power threshold, the sixth power is greater than the seventh power threshold, and the seventh power threshold is greater than the eighth power threshold.

[0079] Among them, the energy sources for charging the power battery are divided into two types. The first is to provide the energy source for the power battery through the internal charging path of the power battery, and the second is to use the energy output of the charging pile as the energy source for the power battery. In the embodiments of the present application, the second energy source for charging the power battery is called the external path, and parameters such as external current and external voltage are included in the external path.

[0080] In an exemplary embodiment of the present application, the discharge power of the power battery is represented by P, and the fifth power threshold, sixth power threshold, seventh power threshold, and eighth power threshold are respectively represented as P5, P6, P7, and P8. Then, when the discharge power of the power battery is at the fifth level, that is, P > P5, the vehicle can meet the consumption of DC / DC, the PTC heating of the power battery, and the consumption of the CCU. Among them, P5 = i link *u link +i d *u d +P a -i0*u0.

[0081] Among them, i link is the external current of the power battery, u link is the external voltage of the power battery, P a is the maximum power limit of the CCU maximum power and the PTC maximum power, i d is the DC / DC input current, u d is the DC / DC input voltage, i0 is the output current of the charging pile, and u0 is the output voltage of the charging pile.

[0082] When the discharge power of the power battery is at the sixth level, that is, P6 < P ≤ P5, the internal charging path of the power battery is disconnected, and the consumption of the vehicle DC / DC, the PTC heating of the power battery, and the consumption of the CCU are preferentially ensured. Among them, P6 = i d *u d +P a -i0*u0.

[0083] When the discharge power of the power battery is at the seventh level, that is, P7 < P ≤ P6, the internal charging path of the power battery is disconnected, and the consumption of the CCU and the PTC heating of the power battery are turned off, and the vehicle DC / DC is preferentially ensured. Among them, P7 = i d *u d -i0*u0.

[0084] When the discharge power of the power battery is at the eighth level, that is, P8 < P ≤ P7, disconnect the internal charging path of the power battery, turn off the consumption of the CCU and the consumption of the power battery PTC heating, and reduce the consumption power of the vehicle DC / DC to 75% to prevent the vehicle from being unable to charge due to overcurrent of the BMS. Among them, the value of P8 is 0 or a value close to 0. When the discharge power of the power battery is close to 0, limit the consumption power of the DC / DC;

[0085] When the discharge power of the power battery is not greater than P8, that is, P ≤ P8, disconnect the internal charging path of the power battery, turn off the consumption of the CCU, the consumption of the power battery PTC heating, and the vehicle DC / DC, where P5 > P6 > P7 > P8 ≥ 0.

[0086] In the power battery charging method provided by this application, according to the levels of the discharge power of the power battery, disconnect the internal charging path of the power battery, the consumption of the CCU, the consumption of the power battery PTC heating, and the vehicle DC / DC respectively, which can further save the remaining power of the power battery, avoid unnecessary consumption of the remaining power of the power battery, and can better charge the power battery.

[0087] In some embodiments, it further includes:

[0088] Monitor the discharge power of the power battery. When the discharge power of the power battery is at the seventh level or the sixth level or the fifth level, based on the level, open the internal charging path of the power battery and open the vehicle thermal management accessories outside the corresponding limit range of the level.

[0089] In an exemplary embodiment of this application, when the discharge power of the power battery P > P7, start enabling the vehicle DC / DC. As the discharge power of the power battery and the temperature of the power battery increase, the power battery heating stage will become the power battery charging stage, and the internal charging path of the power battery will also participate in energy output, outputting to the vehicle thermal management accessories and the consumption of the power battery. That is, as the level increases, open the vehicle thermal management accessories outside the corresponding limit range of the level and open the internal charging path of the power battery. Among them, the consumption priority of the power battery PTC is greater than the consumption of the CCU.

[0090] All the above optional technical solutions can be combined arbitrarily to form the optional embodiments of this application, which will not be elaborated here one by one.

[0091] The following is an embodiment of the device of this application, which can be used to execute the embodiment of the method of this application. For the details not disclosed in the embodiment of the device of this application, please refer to the embodiment of the method of this application.

[0092] Figure 2 It is a schematic diagram of a power battery charging device provided by an embodiment of this application. As Figure 2As shown, the power battery charging device 200 includes an acquisition module 201, a determination module 202, and a processing module 203.

[0093] The acquisition module 201 is configured to acquire the status parameters of the power battery in real time. The status parameters include the power battery discharge power, as well as the power battery temperature or the remaining power battery charge. The power battery discharge power is used to characterize the remaining usage time of the power battery.

[0094] The determination module 202 is configured to determine the current charging stage of the power battery based on the power battery temperature or the remaining power battery charge. The current charging stage is either the power battery heating stage or the power battery charging stage.

[0095] The processing module 203 is configured to shut down one or more of the vehicle thermal management accessories based on the power battery discharge power if the power battery is in the power battery charging stage. The vehicle thermal management accessories include the DC-DC converter, the air conditioning thermal management system accessory, and the power battery thermal management system accessory.

[0096] In some embodiments, the processing module 203, based on the power battery discharge power, shuts down one or more of the vehicle thermal management accessories, for the following purposes:

[0097] Based on the power battery discharge power, determine the level corresponding to the power battery discharge power, and close the vehicle thermal management accessories within the corresponding limit range of the level.

[0098] In some embodiments, before shutting down one or more of the vehicle thermal management accessories based on the power battery discharge power, the determining module 202 determines the current charging stage of the power battery, for the purpose of:

[0099] If the power battery temperature is not higher than the minimum temperature, then the power battery is determined to be in the power battery heating stage. The minimum temperature is the minimum temperature required for the power battery to be charged.

[0100] If the power battery temperature is higher than the minimum temperature, then the power battery is determined to be in the power battery charging stage.

[0101] In some embodiments, the processing module 203 determines the level corresponding to the power battery discharge power based on the power battery discharge power, and shuts down the vehicle thermal management accessories within the corresponding range of the level, for the purpose of:

[0102] If the power battery discharge power is at the first level, control all vehicle thermal management accessories to remain in the current state;

[0103] If the power battery discharge power is at the second level, turn off the air conditioning thermal management accessory;

[0104] If the power battery discharge power is at level three, turn off the air conditioning thermal management accessory and the power battery thermal management accessory.

[0105] If the power battery discharge power is at level four, turn off the air conditioning thermal management accessory and the power battery thermal management accessory, and reduce the power of the DC converter according to the preset percentage;

[0106] If the power battery discharge power is zero, turn off all vehicle thermal management accessories;

[0107] The first level is when the power battery discharge power is greater than the first power threshold; the second level is when the power battery discharge power is greater than the second power threshold but not greater than the first power threshold; the third level is when the power battery discharge power is greater than the third power threshold but not greater than the second power threshold; and the fourth level is when the power battery discharge power is greater than the fourth power threshold but not greater than the third power threshold. The first power threshold is greater than the second power threshold, the second power threshold is greater than the third power threshold, and the third power threshold is greater than the fourth power threshold.

[0108] In some embodiments, the processing module 203 is further configured to:

[0109] Monitor the power battery discharge power. When the power battery discharge power is at level 3, level 2, or level 1, activate the vehicle thermal management accessories outside the corresponding limit range based on the level.

[0110] In some embodiments, before shutting down one or more of the vehicle thermal management accessories based on the power battery discharge power, the determining module 202 determines the current charging stage of the power battery, for the purpose of:

[0111] Based on a preset time period, the discharge power of the power battery is monitored. When the discharge power of the power battery continues to decrease, it is determined that the discharge power of the power battery is in a state of continuous decrease.

[0112] If the power battery discharge power corresponding to the remaining power of the power battery is in a state of continuous decrease, then the power battery is determined to be in the power battery charging stage.

[0113] In some embodiments, the processing module 203 determines the level corresponding to the power battery discharge power based on the power battery discharge power, and shuts down the vehicle thermal management accessories within the corresponding limit range of the level, for the purpose of:

[0114] If the power battery discharge power is at level 5, control all vehicle thermal management accessories and the internal charging path of the power battery to remain in the current state.

[0115] If the power battery discharge power is at level six, disconnect the internal charging path of the power battery.

[0116] If the power battery discharge power is at level seven, disconnect the internal charging path of the power battery and turn off the air conditioning thermal management accessories and the power battery thermal management accessories.

[0117] If the power battery discharge power is at level eight, disconnect the internal charging path of the power battery, turn off the air conditioning thermal management accessory and the power battery thermal management accessory, and reduce the power of the DC converter according to the preset percentage.

[0118] If the power battery discharge power is zero, disconnect the internal charging path of the power battery and turn off all vehicle thermal management accessories;

[0119] Among them, the fifth level is when the power battery discharge power is greater than the fifth power threshold, the sixth level is when the power battery discharge power is greater than the sixth power threshold but not greater than the fifth power threshold, the seventh level is when the power battery discharge power is greater than the seventh power threshold but not greater than the sixth power threshold, and the eighth level is when the power battery discharge power is greater than the eighth power threshold but not greater than the seventh power threshold. Among these, the fifth power threshold is greater than the sixth power threshold, the sixth power is greater than the seventh power threshold, and the seventh power threshold is greater than the eighth power threshold.

[0120] In some embodiments, the processing module 203 is further configured to:

[0121] Monitor the power battery discharge power. When the power battery discharge power is at level 7, level 6, or level 5, based on the level, activate the internal charging path of the power battery and activate the vehicle thermal management accessories outside the corresponding limit range of the level.

[0122] It should be understood that the sequence number of each step in the above embodiments does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0123] This application also provides a vehicle, including a vehicle controller, which is used to execute the steps of the above-described power battery charging method.

[0124] Figure 3 This is a schematic diagram of the electronic device 3 provided in an embodiment of this application. Figure 3 As shown, the electronic device 3 of this embodiment includes: a processor 301, a memory 302, and a computer program 303 stored in the memory 302 and executable on the processor 301. When the processor 301 executes the computer program 303, it implements the steps in the various method embodiments described above. Alternatively, when the processor 301 executes the computer program 303, it implements the functions of each module / unit in the various device embodiments described above.

[0125] Electronic device 3 can be a desktop computer, laptop, handheld computer, cloud server, or other electronic device. Electronic device 3 may include, but is not limited to, processor 301 and memory 302. Those skilled in the art will understand that... Figure 3 This is merely an example of electronic device 3 and does not constitute a limitation on electronic device 3. It may include more or fewer components than shown, or different components.

[0126] The processor 301 may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc.

[0127] The memory 302 can be an internal storage unit of the electronic device 3, such as a hard disk or RAM. The memory 302 can also be an external storage device of the electronic device 3, such as a plug-in hard disk, Smart Media Card (SMC), Secure Digital (SD) card, or Flash Card. The memory 302 can also include both internal and external storage units of the electronic device 3. The memory 302 is used to store computer programs and other programs and data required by the electronic device.

[0128] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the above-described division of functional units and modules is merely an example. In practical applications, the above functions can be assigned to different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiments can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0129] If an integrated module / unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, all or part of the processes in the methods of the above embodiments can also be implemented by a computer program instructing related hardware. The computer program can be stored in a computer-readable storage medium, and when executed by a processor, it can implement the steps of the various method embodiments described above. The computer program may include computer program code, which can be in the form of source code, object code, executable files, or certain intermediate forms. The computer-readable medium may include: any entity or device capable of carrying computer program code, recording media, USB flash drives, portable hard drives, magnetic disks, optical disks, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signals, telecommunication signals, and software distribution media, etc. It should be noted that the content included in the computer-readable medium may be appropriately added to or subtracted according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, the computer-readable medium does not include electrical carrier signals and telecommunication signals.

[0130] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. A method for charging a power battery, characterized in that, The method includes: Under normal basic functioning conditions of the power battery, the status parameters of the power battery are acquired in real time. The status parameters include the power battery discharge power, the power battery temperature, and the remaining power battery charge. The power battery discharge power is used to characterize the remaining usage time of the power battery. The remaining usage time of the power battery is confirmed by two methods: power battery discharge power and power battery temperature, and power battery discharge power and remaining power battery charge. Based on the power battery temperature or the remaining power battery charge, the current charging stage of the power battery is determined, wherein the current charging stage is either the power battery heating stage or the power battery charging stage. If the power battery is in the power battery charging stage, the level corresponding to the power battery discharge power is determined based on the power battery discharge power, and the vehicle thermal management accessories within the corresponding limit range of the level are turned off. The vehicle thermal management accessories include DC-DC converters, air conditioning thermal management system accessories, and power battery thermal management system accessories.

2. The method according to claim 1, characterized in that, Based on the temperature of the power battery, the current charging stage of the power battery is determined, including: If the temperature of the power battery is not greater than the minimum temperature, then the power battery is determined to be in the power battery heating stage, where the minimum temperature is the minimum temperature required for the power battery to be charged. If the temperature of the power battery is greater than the minimum temperature, then the power battery is determined to be in the power battery charging stage.

3. The method according to claim 2, characterized in that, Based on the power battery discharge power, determine the level corresponding to the power battery discharge power, and shut down the vehicle thermal management accessories within the corresponding range of the level, including: If the power battery discharge power is at the first level, control all vehicle thermal management accessories to remain in the current state; If the power battery discharge power is at the second level, turn off the air conditioning thermal management accessory; If the power battery discharge power is at level three, turn off the air conditioning thermal management accessory and the power battery thermal management accessory; If the power battery discharge power is at level four, turn off the air conditioning thermal management accessory and the power battery thermal management accessory, and reduce the power of the DC converter by a preset percentage; If the power battery discharge power is zero, shut down all vehicle thermal management accessories. Wherein, the first level is when the discharge power of the power battery is greater than a first power threshold, the second level is when the discharge power of the power battery is greater than a second power threshold but not greater than the first power threshold, the third level is when the discharge power of the power battery is greater than a third power threshold but not greater than the second power threshold, and the fourth level is when the discharge power of the power battery is greater than a fourth power threshold but not greater than the third power threshold, wherein the first power threshold is greater than the second power threshold, the second power threshold is greater than the third power threshold, and the third power threshold is greater than the fourth power threshold.

4. The method according to claim 3, characterized in that, Also includes: Monitor the discharge power of the power battery, and when the discharge power of the power battery is at the third level, the second level, or the first level, activate the vehicle thermal management accessory outside the corresponding limit range of the level.

5. The method according to claim 1, characterized in that, Based on the remaining charge of the power battery, determine the current charging stage of the power battery, including: Based on a preset time period, the discharge power of the power battery is monitored. When the discharge power of the power battery continues to decrease, it is determined that the discharge power of the power battery is in a state of continuous decrease. If the power battery discharge power corresponding to the remaining power of the power battery is in the continuously decreasing state, then the power battery is determined to be in the power battery charging stage.

6. The method according to claim 5, characterized in that, Based on the power battery discharge power, determine the level corresponding to the power battery discharge power, and shut down the vehicle thermal management accessories within the corresponding limit range of the level, including: If the power battery discharge power is at level 5, control all vehicle thermal management accessories and the internal charging path of the power battery to remain in the current state; If the power battery discharge power is at level six, disconnect the internal charging path of the power battery. If the power battery discharge power is at level seven, disconnect the internal charging path of the power battery and turn off the air conditioning thermal management accessory and the power battery thermal management accessory; If the power battery discharge power is at level eight, disconnect the internal charging path of the power battery, turn off the air conditioning thermal management accessory and the power battery thermal management accessory, and reduce the power of the DC converter by a preset percentage; If the power battery discharge power is zero, disconnect the internal charging path of the power battery and turn off all vehicle thermal management accessories; The fifth level is defined as the power battery discharge power being greater than a fifth power threshold; the sixth level is defined as the power battery discharge power being greater than a sixth power threshold but not greater than the fifth power threshold; the seventh level is defined as the power battery discharge power being greater than a seventh power threshold but not greater than the sixth power threshold; and the eighth level is defined as the power battery discharge power being greater than an eighth power threshold but not greater than the seventh power threshold. The fifth power threshold is greater than the sixth power threshold, the sixth power is greater than the seventh power threshold, and the seventh power threshold is greater than the eighth power threshold.

7. The method according to claim 6, characterized in that, Also includes: Monitor the discharge power of the power battery. When the discharge power of the power battery is at the seventh level, the sixth level, or the fifth level, based on the level, open the internal charging path of the power battery and open the vehicle thermal management accessories outside the corresponding limit range of the level.

8. A power battery charging device, characterized in that, include: The acquisition module is configured to acquire the status parameters of the power battery in real time when the basic functions of the power battery are normal. The status parameters include the power battery discharge power, as well as the power battery temperature or the remaining power battery charge. The power battery discharge power is used to characterize the remaining usage time of the power battery. The determination module is configured to determine the current charging stage of the power battery based on the power battery temperature or the remaining power battery charge, wherein the current charging stage is either the power battery heating stage or the power battery charging stage. The processing module is configured to, if the power battery is in the power battery charging stage, determine the level corresponding to the power battery discharge power based on the power battery discharge power, and shut down the vehicle thermal management accessories within the corresponding limit range of the level, wherein the vehicle thermal management accessories include DC-DC converters, air conditioning thermal management system accessories, and power battery thermal management system accessories.

9. A vehicle, comprising a vehicle controller, the vehicle controller being configured to perform the steps of the method according to any one of claims 1-7.

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