Low-temperature charging control method, device and system and storage medium

Abstract

The invention relates to a low-temperature charging control method, device and system and a storage medium, and the method comprises the steps: determining the maximum charging power of a power battery based on the real-time state information of the power battery; when the maximum charging power of the power battery is lower than the limited output power of the vehicle-mounted charging equipment, heating the power battery to a first target temperature; wherein the difference value between the limited output power and the maximum output power of the vehicle-mounted charging equipment is smaller than a preset power threshold value; the maximum charging power of the power battery at the first target temperature is not lower than the limited output power; and controlling the vehicle-mounted charging equipment to charge the power battery at the limited output power. Through the method and the device, the problem that the low-temperature charging time cannot be effectively shortened due to the fact that the charging strategy is difficult to fully utilize the charging performance of the vehicle-mounted charging equipment and the battery is solved, the low-temperature charging control is realized by fully utilizing the charging performance of the vehicle-mounted charging equipment and the battery, and the low-temperature charging time is effectively shortened.

Description

Technical Field

[0001] The present application relates to the technical field of electric vehicles, and in particular to a low-temperature charging control method, device, system and storage medium. Background Art

[0002] With the development of the new energy vehicle industry, the market share of lithium-ion power batteries, one of the core components of new energy vehicles, has gradually increased. However, due to the high and low temperature characteristics of lithium batteries themselves and the diversity of their use environments, problems such as slow low-temperature charging time and weak low-temperature power have arisen.

[0003] In order to solve the above problems, the battery is usually heated to a normal temperature range to increase the battery charging rate. However, the charging strategy of this method is difficult to fully utilize the on-board charging equipment and the charging performance of the battery, and thus cannot effectively shorten the low-temperature charging time.

[0004] There is currently no effective solution to the problem that the charging strategy in the relevant technology cannot fully utilize the charging performance of the on-board charging equipment and the battery, thereby failing to effectively shorten the low-temperature charging time. Summary of the invention

[0005] In this embodiment, a low-temperature charging control method, device, system and storage medium are provided to solve the problem that the charging strategy in the related art cannot fully utilize the charging performance of the vehicle-mounted charging equipment and the battery, thereby failing to effectively shorten the low-temperature charging time.

[0006] In a first aspect, a low temperature charging control method is provided in this embodiment, and the method includes:

[0007] Determining the maximum charging power of the power battery based on the real-time status information of the power battery;

[0008] When the maximum charging power of the power battery is lower than the limited output power of the on-board charging device, the power battery is heated to a first target temperature; wherein the difference between the limited output power and the maximum output power of the on-board charging device is less than a preset power threshold; and the maximum charging power of the power battery at the first target temperature is not lower than the limited output power;

[0009] The on-vehicle charging device is controlled to charge the power battery with the limited output power.

[0010] In some embodiments, when the maximum charging power of the power battery is lower than the limited output power of the on-board charging device, heating the power battery to a first target temperature includes:

[0011] When the maximum charging power of the power battery is lower than the limited output power of the on-board charging device, determining whether the remaining battery power of the power battery exceeds a preset power power;

[0012] When it is detected that the remaining battery power of the power battery does not exceed the preset power power, the power battery is heated to the first target temperature.

[0013] In some embodiments, after determining the maximum charging power of the power battery based on the real-time status information of the power battery, the method further includes:

[0014] When the maximum charging power of the power battery is not lower than the limited output power of the on-board charging device and the lowest temperature of the power battery within a preset time period exceeds a first preset temperature, the on-board charging device is controlled to charge the power battery with the limited output power.

[0015] In some embodiments, after determining the maximum charging power of the power battery based on the real-time status information of the power battery, the method further includes:

[0016] When the maximum charging power of the power battery is not lower than the limited output power of the on-board charging device and the lowest temperature of the power battery within a preset time period does not exceed a first preset temperature, the power battery is heated to the first target temperature.

[0017] In some of the embodiments, after controlling the on-board charging device to charge the power battery with the limited output power, the method further includes:

[0018] Real-time monitoring of whether the maximum charging power of the power battery is lower than the limited output power of the on-board charging device;

[0019] When the maximum charging power of the power battery is lower than the limited output power of the on-board charging device, the power battery is heated to a second target temperature; the second target temperature is determined based on the first target temperature, the current minimum temperature of the power battery and the minimum temperature of the power battery at the end of the last heating.

[0020] In some of the embodiments, the first target temperature is set based on a battery health state of the power battery.

[0021] In some of the embodiments, after controlling the on-board charging device to charge the power battery with the limited output power, the method further includes:

[0022] When it is detected that the charging state of the power battery meets the pre-input charging instruction information, the charging is terminated.

[0023] In a second aspect, a low temperature charging control device is provided in this embodiment, the device comprising: a determination module, a heating module and a control module;

[0024] The determination module is used to determine the maximum charging power of the power battery based on the real-time status information of the power battery;

[0025] The heating module is used to heat the power battery to a first target temperature when the maximum charging power of the power battery is lower than the limited output power of the on-board charging device; wherein the difference between the limited output power and the maximum output power of the on-board charging device is less than a preset power threshold; and the maximum charging power of the power battery at the first target temperature is not lower than the limited output power;

[0026] The control module is used to control the on-board charging device to charge the power battery at the limited output power.

[0027] In a third aspect, a low-temperature charging control system is provided in this embodiment, the system comprising a processing module and a vehicle thermal management system for heating the power battery; wherein the processing module is used to implement the low-temperature charging control method described in the first aspect above.

[0028] In a fourth aspect, a storage medium is provided in this embodiment, on which a computer program is stored, and when the program is executed by a processor, the low-temperature charging control method described in the first aspect is implemented.

[0029] Compared with the related art, the low-temperature charging control method, device, system and storage medium provided in this embodiment determine the maximum charging power of the power battery based on the real-time status information of the power battery; when the maximum charging power of the power battery is lower than the limited output power of the on-board charging device, the power battery is heated to a first target temperature; wherein the difference between the limited output power and the maximum output power of the on-board charging device is less than a preset power threshold; the maximum charging power of the power battery at the first target temperature is not lower than the limited output power; the on-board charging device is controlled to charge the power battery with the limited output power, thereby solving the problem that the charging strategy is difficult to fully utilize the charging performance of the on-board charging device and the battery, thereby being unable to effectively shorten the low-temperature charging time, and achieving full utilization of the charging performance of the on-board charging device and the battery for low-temperature charging control, effectively shortening the low-temperature charging time, and reducing energy consumption at the same time.

[0030] Details of one or more embodiments of the present application are set forth in the following drawings and description to make other features, objects, and advantages of the present application more readily apparent. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0032] Figure 1 It is a hardware structure block diagram of a terminal device of a low-temperature charging control method provided by an embodiment of the present application;

[0033] Figure 2 is a flow chart of a low temperature charging control method provided by an embodiment of the present application;

[0034] Figure 3 is a flow chart of a low temperature charging control method provided by another embodiment of the present application;

[0035] Figure 4 is a flow chart of a low temperature charging control method provided by a preferred embodiment of the present application;

[0036] Figure 5 It is a structural block diagram of a low-temperature charging control device provided in one embodiment of the present application.

[0037] In the figure: 102, processor; 104, memory; 106, transmission device; 108, input and output device; 10, determination module; 20, heating module; 30, control module. DETAILED DESCRIPTION

[0038] In order to more clearly understand the purpose, technical solutions and advantages of the present application, the present application is described and illustrated below in conjunction with the accompanying drawings and embodiments.

[0039] Unless otherwise defined, the technical terms or scientific terms involved in this application shall have the general meaning understood by people with ordinary skills in the technical field to which this application belongs. The words "one", "a", "a", "the", "these" and the like in this application do not represent quantitative restrictions, and they can be singular or plural. The terms "include", "comprise", "have" and any variants thereof involved in this application are intended to cover non-exclusive inclusions; for example, a process, method and system, product or device comprising a series of steps or modules (units) is not limited to the listed steps or modules (units), but may include unlisted steps or modules (units), or may include other steps or modules (units) inherent to these processes, methods, products or devices. The words "connect", "connected", "coupled" and the like involved in this application are not limited to physical or mechanical connections, but may include electrical connections, whether directly or indirectly. The "multiple" involved in this application refers to two or more. "And / or" describes the association relationship of associated objects, indicating that there can be three relationships. For example, "A and / or B" can mean: A exists alone, A and B exist at the same time, and B exists alone. Usually, the character " / " indicates that the objects associated with each other are in an "or" relationship. The terms "first", "second", "third", etc. involved in this application are only used to distinguish similar objects and do not represent a specific ordering of the objects.

[0040] The method embodiment provided in this embodiment can be executed in a terminal, a computer or a similar computing device. For example, running on a terminal, Figure 1 FIG. 1 is a hardware structure block diagram of a terminal of the low temperature charging control method of this embodiment. Figure 1 As shown, the terminal may include one or more ( Figure 1 Only one is shown in the figure) processor 102 and memory 104 for storing data, wherein processor 102 may include but is not limited to a processing device such as a microprocessor MCU or a programmable logic device FPGA. The above terminal may also include a transmission device 106 and an input and output device 108 for communication functions. It can be understood by those skilled in the art that Figure 1 The structure shown is only for illustration and does not limit the structure of the above terminal. Figure 1 More or fewer components as shown, or with Figure 1 Different configurations shown.

[0041] The memory 104 can be used to store computer programs, for example, software programs and modules of application software, such as the computer program corresponding to the low-temperature charging control method in the present embodiment. The processor 102 executes various functional applications and data processing by running the computer program stored in the memory 104, that is, to implement the above method. The memory 104 may include a high-speed random access memory, and may also include a non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some examples, the memory 104 may further include a memory remotely arranged relative to the processor 102, and these remote memories may be connected to the terminal via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and a combination thereof.

[0042] The transmission device 106 is used to receive or send data via a network. The above network includes a wireless network provided by the communication provider of the terminal. In one example, the transmission device 106 includes a network adapter (Network Interface Controller, referred to as NIC), which can be connected to other network devices through a base station so as to communicate with the Internet. In one example, the transmission device 106 can be a radio frequency (Radio Frequency, referred to as RF) module, which is used to communicate with the Internet wirelessly.

[0043] In this embodiment, a low temperature charging control method is provided. Figure 2 is a flow chart of the low temperature charging control method of this embodiment. Figure 2 As shown, the process includes the following steps:

[0044] Step S210, determining the maximum charging power of the power battery based on the real-time status information of the power battery;

[0045] Step S220, when the maximum charging power of the power battery is lower than the limited output power of the on-board charging device, heating the power battery to a first target temperature; wherein the difference between the limited output power and the maximum output power of the on-board charging device is less than a preset power threshold; and the maximum charging power of the power battery at the first target temperature is not lower than the limited output power;

[0046] Step S230: Control the on-board charging device to charge the power battery with a limited output power.

[0047] Specifically, the vehicle charging is controlled according to the preset charging instruction information, and the charging process is started when the plug-in signal of the charging gun is detected and the charging start condition indicated by the charging instruction information is met. Among them, the charging instruction information includes but is not limited to the charging time, charging power and charging temperature of the power battery, and the user can customize the charging instruction information. According to the input voltage and protection limit of the on-board charging device, the maximum output power of the on-board charging device is determined, and the limited output power of the on-board charging device is set based on the maximum output power. The difference between the limited output power and the maximum output power is less than the preset power threshold. The user can set the limited output power according to the actual application requirements. The limited output power can be slightly less than the maximum output power, so that the charging control can be more flexible and intelligent while making full use of the charging performance of the on-board charging device and the battery for low-temperature charging control, and adapting to the personalized needs of the user. The limited output power is preferably the maximum output power of the on-board charging device, and the maximum charging power of the power battery is determined based on the real-time status information of the power battery. The real-time status information includes the remaining battery power and battery temperature of the power battery.

[0048] The maximum charging power of the power battery is compared with the limited output power of the on-board charging device to detect whether the maximum charging power is lower than the limited output power. When the maximum charging power of the power battery is not lower than the limited output power of the on-board charging device, it is determined whether the lowest temperature of the power battery within the preset time period exceeds the first preset temperature, for example, it is determined whether the lowest temperature of the power battery within 1 minute exceeds the first preset temperature. If the lowest temperature of the power battery within the preset time period exceeds the first preset temperature, the on-board charging device is controlled to charge the power battery with the limited output power; if the lowest temperature of the power battery within the preset time period does not exceed the first preset temperature, the power battery is heated to the first target temperature, and then the on-board charging device is controlled to charge the power battery with the limited output power. When the maximum charging power of the power battery is lower than the limited output power of the on-board charging device, the power battery is heated to the first target temperature, and then the on-board charging device is controlled to charge the power battery with the limited output power.

[0049] Since the power battery will have different attenuation states during its use in the whole life cycle, the power of battery charging and discharging will be reduced at the same temperature. Based on this, the above-mentioned first target temperature is pre-set based on the battery health state of the power battery. For example, the first target temperature is set to -5℃ to 5℃, and the maximum charging power of the power battery at the first target temperature is not less than the limited output power. At the same time, the maximum charging power of the power battery can be adjusted according to the battery health state of the power battery. The maximum charging power is multiplied by the battery health state coefficient to obtain the latest charging power of the power battery, so that low-temperature charging control can be performed throughout the life cycle of the power battery. According to the status of the power battery at different stages in the whole life cycle, by dynamically adjusting the thermal management parameters to match the current battery status, the charging power of the power battery can be maximized under the premise of protecting the power battery, and the low-temperature charging time can be effectively shortened.

[0050] It should be noted that when the maximum charging power of the power battery is lower than the limited output power of the on-board charging device, it can be determined whether the remaining battery power of the power battery exceeds the preset power. When it is detected that the remaining battery power of the power battery does not exceed the preset power, the power battery is heated to the first target temperature. This is because when the remaining battery power is high, the increase in battery temperature has less effect on increasing the charging power, thereby avoiding consuming extra power to heat the battery.

[0051] Furthermore, during the charging process of the power battery, the relationship between the maximum charging power of the power battery and the limited output power of the on-board charging device is continuously monitored to assist in determining whether it is necessary to start the heating process of the power battery. When the power battery is heated for the first time, the power battery is heated to a first target temperature to increase the charging power of the power battery so that the maximum charging power of the power battery is not less than the limited output power of the on-board charging device; when the power battery is heated for the second time, the power battery is heated to a second target temperature, and the maximum charging power of the power battery at the second target temperature is not less than the limited output power of the on-board charging device. The second target temperature is obtained by temperature compensation based on the first target temperature, and the compensation temperature value can be determined based on the current minimum temperature value of the battery and the minimum temperature of the battery at the end of the last heating; when the power battery is heated for n (n>2) times, based on the target temperature set for the previous heating, the target temperature setting strategy in the secondary heating is referred to to determine the target temperature for the current heating. At the same time, in order to reduce energy consumption, a maximum value of the target temperature can be set, for example, the target temperature is set to a maximum value of 25°C. The charging process ends when it is detected that the charging state of the power battery meets the pre-input charging instruction information, such as reaching the charging time and charging power specified by the charging instruction information.

[0052] Due to the high and low temperature characteristics of lithium batteries and the diversity of the environments in which they are used, the battery has problems such as slow charging time at low temperatures and weak low temperature power. In order to solve this problem, the battery is usually heated to a normal temperature range to increase the battery charging rate, but this charging strategy is difficult to fully utilize the on-board charging equipment and the charging performance of the battery, and thus cannot effectively shorten the low temperature charging time.

[0053] Compared with the prior art, the present application determines the maximum charging power of the power battery based on the real-time status information of the power battery; when the maximum charging power of the power battery is lower than the limited output power of the on-board charging device, the power battery is heated to the first target temperature; wherein the difference between the limited output power and the maximum output power of the on-board charging device is less than the preset power threshold; the maximum charging power of the power battery at the first target temperature is not lower than the limited output power; and the on-board charging device is controlled to charge the power battery with the limited output power. Based on this, during the charging process of the power battery, it is monitored in real time whether the current charging power of the power battery reaches the upper limit of the charging device. If the current charging power of the power battery does not reach the upper limit of the charging device, the battery charging power is increased by heating the power battery, so that the charging device can charge the power battery with a high output power, which solves the problem that the charging strategy is difficult to fully utilize the charging performance of the on-board charging device and the battery, thereby failing to effectively shorten the low-temperature charging time, and realizes the full utilization of the charging performance of the on-board charging device and the battery for low-temperature charging control, effectively shortening the low-temperature charging time. In addition, the charging control strategy of the present application is not limited by the power size of the external on-board charging equipment and the charging characteristics of different types of power batteries, and is compatible with vehicle models of different architectures, with good strategy compatibility.

[0054] In some of the embodiments, Figure 3 As shown, when the maximum charging power of the power battery is lower than the limited output power of the on-board charging device, step S220 heats the power battery to a first target temperature, including the following steps:

[0055] Step S221, when the maximum charging power of the power battery is lower than the limited output power of the on-board charging device, determining whether the remaining battery power of the power battery exceeds a preset power power;

[0056] Step S222: When it is detected that the remaining battery power of the power battery does not exceed the preset power power, the power battery is heated to a first target temperature.

[0057] Specifically, when the maximum charging power of the power battery is lower than the limited output power of the on-board charging device, it is determined whether the remaining battery power of the power battery exceeds the preset power. If it is detected that the remaining battery power of the power battery does not exceed the preset power, the power battery is heated to a first target temperature, which is pre-set based on the battery health status of the power battery. The maximum charging power of the power battery at the first target temperature is not lower than the limited output power, and the on-board charging device is controlled to charge the power battery with the limited output power. Among them, the difference between the limited output power and the maximum output power is less than the preset power threshold. The user can set the limited output power according to the actual application requirements to make the charging control more intelligent. The limited output power is preferably the maximum output power.

[0058] In addition, if it is detected that the remaining power of the power battery does not exceed the preset power, the on-board charging device charges the power battery at the maximum charging power of the power battery. During the charging process of the power battery, the relationship between the maximum charging power of the power battery and the limited output power of the on-board charging device is continuously monitored to assist in determining whether the heating process of the power battery needs to be started.

[0059] It should be noted that when the remaining battery power is high, the increase in battery temperature has little effect on increasing the charging power. When the remaining battery power of the power battery exceeds the preset power, there is no need to start the power battery heating process, which can avoid consuming additional power to heat the battery.

[0060] Through this embodiment, when the maximum charging power of the power battery is lower than the limited output power of the on-board charging device, it is determined whether the remaining battery power of the power battery exceeds the preset power, and when it is detected that the remaining battery power of the power battery does not exceed the preset power, the power battery is heated to the first target temperature to avoid consuming additional power to heat the battery when the battery temperature rise has little effect on increasing the charging power.

[0061] In some of the embodiments, after determining the maximum charging power of the power battery based on the real-time status information of the power battery, the low-temperature charging control method further includes the following steps:

[0062] When the maximum charging power of the power battery is not lower than the limited output power of the on-board charging device and the lowest temperature of the power battery within a preset time period exceeds a first preset temperature, the on-board charging device is controlled to charge the power battery with the limited output power.

[0063] Specifically, when the maximum charging power of the power battery is not lower than the limited output power of the on-board charging device, it is determined whether the lowest temperature of the power battery within a preset time period exceeds a first preset temperature, for example, whether the lowest temperature of the power battery exceeds the first preset temperature within 1 minute.

[0064] If the lowest temperature of the power battery exceeds the first preset temperature within the preset time period, the on-board charging device is controlled to charge the power battery with a limited output power. Otherwise, the heating process of the power battery is started. It should be noted that the difference between the limited output power and the maximum output power is less than the preset power threshold, and the user can set the limited output power according to actual application requirements.

[0065] Through this embodiment, when the maximum charging power of the power battery is not lower than the limited output power of the on-board charging device and the lowest temperature of the power battery within a preset time period exceeds a first preset temperature, the on-board charging device is controlled to charge the power battery with the limited output power, thereby making full use of the charging performance of the on-board charging device and the battery for charging, which helps to shorten the charging time and improve the charging efficiency.

[0066] In some of the embodiments, after determining the maximum charging power of the power battery based on the real-time status information of the power battery, the low-temperature charging control method further includes the following steps:

[0067] When the maximum charging power of the power battery is not less than the limited output power of the on-board charging device and the lowest temperature of the power battery within a preset time period does not exceed a first preset temperature, the power battery is heated to a first target temperature.

[0068] Specifically, when the maximum charging power of the power battery is not less than the limited output power of the on-board charging device, it is determined whether the lowest temperature of the power battery within a preset time period exceeds a first preset temperature, for example, whether the lowest temperature of the power battery exceeds the first preset temperature within 1 minute. If the lowest temperature of the power battery within the preset time period does not exceed the first preset temperature, the heating process of the power battery is started.

[0069] Among them, heating control is started through the vehicle's thermal management system until the lowest temperature of the power battery is added to the first target temperature. The first target temperature is pre-set based on the battery health status of the power battery. The maximum charging power of the power battery at the first target temperature is not lower than the limited output power.

[0070] Through this embodiment, when the maximum charging power of the power battery is not lower than the limited output power of the on-board charging device and the lowest temperature of the power battery within a preset time period does not exceed the first preset temperature, the power battery is heated to the first target temperature to increase the charging power of the power battery by raising the battery temperature, which helps to shorten the charging time.

[0071] In some of the embodiments, after controlling the on-board charging device to charge the power battery with a limited output power, the following steps are also included:

[0072] Real-time monitoring of whether the maximum charging power of the power battery is lower than the limited output power of the on-board charging equipment;

[0073] When the maximum charging power of the power battery is lower than the limited output power of the on-board charging device, the power battery is heated to a second target temperature; the second target temperature is determined based on the first target temperature, the current minimum temperature of the power battery and the minimum temperature of the power battery at the end of the last heating.

[0074] Specifically, during the charging process of the power battery, the relationship between the maximum charging power of the power battery and the limited output power of the on-board charging device is continuously monitored to assist in determining whether the heating process of the power battery needs to be started. When it is detected that the maximum charging power of the power battery is lower than the limited output power of the on-board charging device, the power battery is heated for a second time, and the power battery is heated to a second target temperature. At the second target temperature, the maximum charging power of the power battery is not lower than the limited output power of the on-board charging device. The second target temperature is obtained by temperature compensation based on the first target temperature. The compensation temperature value can be determined based on the current minimum temperature value of the battery and the minimum temperature of the battery at the end of the last heating. The specific calculation formula is as follows:

[0075] T=|T2-T1|+a (1)

[0076] In formula (1), T represents the compensation temperature value; T1 represents the current minimum temperature value of the battery; T2 represents the minimum temperature of the battery when the last heating was completed; a is a preset parameter, which can be set according to the actual application situation, for example, a is taken as 3°C.

[0077] It should be noted that after reaching the second target temperature, the relationship between the maximum charging power of the power battery and the limited output power of the on-board charging device continues to be monitored to assist in determining whether it is necessary to start the heating process of the power battery. When the power battery is heated for n (n>2) times, the target temperature of the current heating is determined based on the target temperature set for the previous heating and with reference to the target temperature setting strategy in the secondary heating. The charging process ends when it is detected that the charging state of the power battery meets the pre-input charging instruction information, such as reaching the charging time and charging power specified by the charging instruction information.

[0078] Through this embodiment, it is monitored in real time whether the maximum charging power of the power battery is lower than the limited output power of the on-board charging device. When the maximum charging power of the power battery is lower than the limited output power of the on-board charging device, the power battery is heated to the second target temperature, so as to adaptively adjust the thermal management parameters according to different charging stages of the battery, make full use of the charging capacity of the power battery and the on-board charging device, and shorten the low-temperature charging time with low energy consumption.

[0079] In some of the embodiments, the first target temperature is set based on a battery health state of the power battery.

[0080] It should be noted that during the use of the power battery throughout its life cycle, different attenuation states will occur, which is manifested in that the power of battery charging and discharging will decrease at the same temperature. Based on this, the first target temperature is pre-set based on the battery health status of the power battery, and the maximum charging power of the power battery at the first target temperature is not less than the limited output power. For example, the first target temperature is set to -5°C to 5°C.

[0081] In addition, the maximum charging power of the power battery can be adjusted according to the battery health status of the power battery. The maximum charging power is multiplied by the battery health status coefficient to obtain the latest charging power of the power battery.

[0082] Through this embodiment, a first target temperature is set based on the battery health status of the power battery, and the charging power of the power battery is adjusted according to the battery health status of the power battery, so as to perform low-temperature charging control throughout the life cycle of the power battery. According to the status of the power battery at different stages of the life cycle, the thermal management parameters are dynamically adjusted to match the current battery status. Under the premise of protecting the power battery, the charging power of the battery can be maximized, and the low-temperature charging time can be effectively shortened.

[0083] In some of the embodiments, after controlling the on-board charging device to charge the power battery with a limited output power, the following steps are also included:

[0084] When it is detected that the charging state of the power battery meets the pre-input charging instruction information, the charging is terminated.

[0085] Specifically, whether the charging status of the power battery satisfies the pre-input charging instruction information is detected in real time, and the charging instruction information includes but is not limited to the charging time, charging power and charging temperature of the power battery. If it is detected that the charging status of the power battery satisfies the pre-input charging instruction information, the charging process is terminated.

[0086] It should be noted that the above charging instruction information can be customized by the user, or the user's vehicle usage habits can be obtained by analyzing the vehicle's historical usage data, such as charging frequency, charging time, and daily charging start and end time, and the above low-temperature charging strategy can be adjusted in combination with the vehicle usage habits.

[0087] Through this embodiment, when it is detected that the charging state of the power battery meets the pre-input charging instruction information, the charging is terminated to meet the personalized needs of the user.

[0088] The present embodiment is described and illustrated below through preferred embodiments.

[0089] Figure 4 is a flow chart of the low temperature charging control method of this preferred embodiment. Figure 4 As shown, the low temperature charging control method includes the following steps:

[0090] When there are no faults in the two-in-one charger, power battery and vehicle parking, enter the charging process. According to the input voltage and protection limit of the two-in-one charger, determine the maximum output power of the two-in-one charger S401, and according to the real-time remaining battery power and battery temperature of the power battery, determine the maximum charging power of the power battery S402. Compare the maximum output power P1 with the maximum charging power P2 of the power battery to determine whether the maximum charging power of the power battery is not lower than the maximum output power S403. When the maximum charging power P2 of the power battery is not lower than the maximum output power P1, charge according to the maximum output power of the two-in-one charger. Determine the lowest temperature T of the power battery at this time min Whether it exceeds the first preset temperature T emp.set And it remains stable for 1 minute S404, if the minimum temperature of the power battery T min Exceeding the first preset temperature T emp.set If the temperature remains stable for 1 minute, the charging process is executed without heating the battery S406. Otherwise, a heating request is sent through the power battery management system, and the vehicle thermal management system starts heating control until the lowest temperature of the power battery reaches the preset target temperature S407.

[0091] When the maximum charging power P2 of the power battery is lower than the maximum output power P1, it is further determined whether the remaining battery power of the power battery is lower than the preset power S405. When it is detected that the remaining battery power of the power battery is lower than the preset power, it can be determined that the charging power of the power battery at the current temperature has not reached the upper limit capacity of the charging device, and the charging power of the power battery needs to be increased by heating. Specifically, the power battery is heated to a preset target temperature S407. For example, the preset target temperature is set to -5°C to 5°C. The preset target temperature can be calibrated according to the current battery health status of the power battery, so that the thermal management strategy covers the entire life cycle of the battery.

[0092] When the temperature of the power battery rises, the charging capacity of the power battery increases accordingly. The difference between the maximum charging power P2 and the maximum output power P1 of the power battery is monitored in real time to ensure that the battery is in a high-power charging state. As the remaining power of the battery increases, the maximum charging power P2 of the power battery will decrease. When the maximum charging power P2, a secondary heating request is triggered to heat the power battery to the secondary target temperature S407; the secondary target temperature is calculated based on the temperature compensation of the target temperature of the first heating. The compensation temperature value can be determined based on the current minimum temperature (T1) of the power battery and the minimum temperature (T2) of the power battery at the end of the last heating. The specific compensation temperature value T = (|T2-T1|+3℃). It should be noted that when the power battery temperature reaches the secondary target temperature, the power difference between P1 and P2 will continue to be judged to determine whether the temperature range has reached the maximum charging capacity. If the nth heating request is subsequently triggered, the target temperature is increased with reference to the above-mentioned strategy gradient. At the same time, in order to reduce energy consumption, the target temperature is set to a maximum value of 25℃. Until it is detected that the charging state of the power battery meets the pre-input charging instruction information, the charging is terminated S408.

[0093] It should be noted that the steps shown in the above process or the flowchart in the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and although a logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0094] In this embodiment, a low-temperature charging control device is also provided, which is used to implement the above-mentioned embodiments and preferred implementation modes, and will not be repeated hereafter. The terms "module", "unit", "subunit", etc. used below can implement a combination of software and / or hardware for a predetermined function. Although the devices described in the following embodiments are preferably implemented in software, the implementation of hardware, or a combination of software and hardware, is also possible and conceivable.

[0095] Figure 5 is a structural block diagram of the low temperature charging control device of this embodiment, as shown in Figure 5 As shown, the device includes: a determination module 10, a heating module 20 and a control module 30;

[0096] A determination module 10, configured to determine the maximum charging power of the power battery based on the real-time status information of the power battery;

[0097] The heating module 20 is used to heat the power battery to a first target temperature when the maximum charging power of the power battery is lower than the limited output power of the on-board charging device; wherein the difference between the limited output power and the maximum output power of the on-board charging device is less than a preset power threshold; and the maximum charging power of the power battery at the first target temperature is not lower than the limited output power;

[0098] The control module 30 is used to control the on-board charging device to charge the power battery with limited output power.

[0099] Through the device provided by this embodiment, the maximum charging power of the power battery is determined based on the real-time status information of the power battery; when the maximum charging power of the power battery is lower than the limited output power of the on-board charging device, the power battery is heated to a first target temperature; wherein the difference between the limited output power and the maximum output power of the on-board charging device is less than a preset power threshold; the maximum charging power of the power battery at the first target temperature is not lower than the limited output power; the on-board charging device is controlled to charge the power battery with the limited output power, thereby solving the problem that the charging strategy cannot fully utilize the charging performance of the on-board charging device and the battery, thereby failing to effectively shorten the low-temperature charging time, and achieving full utilization of the charging performance of the on-board charging device and the battery for low-temperature charging control, thereby effectively shortening the low-temperature charging time.

[0100] In some of the embodiments, the heating module 20 is also used to determine whether the remaining battery power of the power battery exceeds a preset power level when the maximum charging power of the power battery is lower than the limited output power of the on-board charging device; when it is detected that the remaining battery power of the power battery does not exceed the preset power level, the power battery is heated to a first target temperature.

[0101] In some of the embodiments, the control module 30 is also used to control the on-board charging device to charge the power battery with the limited output power when the maximum charging power of the power battery is not less than the limited output power of the on-board charging device and the lowest temperature of the power battery within a preset time period exceeds a first preset temperature.

[0102] In some of the embodiments, the heating module 20 is also used to heat the power battery to a first target temperature when the maximum charging power of the power battery is not less than the limited output power of the on-board charging device and the lowest temperature of the power battery within a preset time period does not exceed a first preset temperature.

[0103] In some of the embodiments, the heating module 20 is also used to monitor in real time whether the maximum charging power of the power battery is lower than the limited output power of the on-board charging device;

[0104] When the maximum charging power of the power battery is lower than the limited output power of the on-board charging device, the power battery is heated to a second target temperature; the second target temperature is determined based on the first target temperature, the current minimum temperature of the power battery and the minimum temperature of the power battery at the end of the last heating.

[0105] In some of these embodiments, Figure 5 On the basis of, the device also includes a detection module, which is used to end the charging when it is detected that the charging state of the power battery meets the pre-input charging instruction information.

[0106] It should be noted that the above modules can be functional modules or program modules, and can be implemented by software or hardware. For modules implemented by hardware, the above modules can be located in the same processor; or the above modules can be located in different processors in any combination.

[0107] In this embodiment, a computer device is further provided, including a memory and a processor, wherein a computer program is stored in the memory, and the processor is configured to run the computer program to execute the steps in any one of the above method embodiments.

[0108] Optionally, the computer device may further include a transmission device and an input / output device, wherein the transmission device is connected to the processor, and the input / output device is connected to the processor.

[0109] Optionally, in this embodiment, the processor may be configured to perform the following steps through a computer program:

[0110] S1, determining the maximum charging power of the power battery based on the real-time status information of the power battery;

[0111] S2, when the maximum charging power of the power battery is lower than the limited output power of the on-board charging device, heating the power battery to a first target temperature; wherein the difference between the limited output power and the maximum output power of the on-board charging device is less than a preset power threshold; and the maximum charging power of the power battery at the first target temperature is not lower than the limited output power;

[0112] S3, controlling the on-board charging device to charge the power battery with limited output power.

[0113] It should be noted that the specific examples in this embodiment can refer to the examples described in the above embodiments and optional implementation modes, and will not be repeated in this embodiment.

[0114] In addition, in combination with the low-temperature charging control method provided in the above embodiments, a storage medium can also be provided in this embodiment to implement the low-temperature charging control method. The storage medium stores a computer program; when the computer program is executed by a processor, any one of the low-temperature charging control methods in the above embodiments is implemented.

[0115] It should be understood that the specific embodiments described herein are only used to explain the application, rather than to limit it. Based on the embodiments provided in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the protection scope of this application.

[0116] Obviously, the drawings are only some examples or embodiments of the present application. For ordinary technicians in the field, the present application can also be applied to other similar situations based on these drawings without creative work. In addition, it is understandable that although the work done in this development process may be complicated and lengthy, for ordinary technicians in the field, certain changes in design, manufacturing or production based on the technical content disclosed in this application are only conventional technical means and should not be regarded as insufficient content disclosed in this application.

[0117] The term "embodiment" in this application refers to a specific feature, structure or characteristic described in conjunction with the embodiment that can be included in at least one embodiment of the present application. The appearance of this phrase in various locations in the specification does not necessarily mean the same embodiment, nor does it mean that it is mutually exclusive with other embodiments and is independent or optional. It is clearly or implicitly understood by those of ordinary skill in the art that the embodiments described in this application can be combined with other embodiments without conflict.

[0118] 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 patent protection. 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 scope of protection of the present application. Therefore, the scope of protection of the present application shall be subject to the attached claims.

Claims

1. A low temperature charging control method, characterized in that: The method comprises: Determining the maximum charging power of the power battery based on the real-time status information of the power battery; When the maximum charging power of the power battery is lower than the limited output power of the on-board charging device, the power battery is heated to a first target temperature; wherein the difference between the limited output power and the maximum output power of the on-board charging device is less than a preset power threshold; and the maximum charging power of the power battery at the first target temperature is not lower than the limited output power; The on-vehicle charging device is controlled to charge the power battery with the limited output power.

2. The low temperature charging control method according to claim 1, characterized in that: When the maximum charging power of the power battery is lower than the limited output power of the on-board charging device, heating the power battery to a first target temperature includes: When the maximum charging power of the power battery is lower than the limited output power of the on-board charging device, determining whether the remaining battery power of the power battery exceeds a preset power power; When it is detected that the remaining battery power of the power battery does not exceed the preset power power, the power battery is heated to the first target temperature.

3. The low temperature charging control method according to claim 1, characterized in that: After determining the maximum charging power of the power battery based on the real-time status information of the power battery, the method further includes: When the maximum charging power of the power battery is not lower than the limited output power of the on-board charging device and the lowest temperature of the power battery within a preset time period exceeds a first preset temperature, the on-board charging device is controlled to charge the power battery with the limited output power.

4. The low temperature charging control method according to claim 1, characterized in that: After determining the maximum charging power of the power battery based on the real-time status information of the power battery, the method further includes: When the maximum charging power of the power battery is not lower than the limited output power of the on-board charging device and the lowest temperature of the power battery within a preset time period does not exceed a first preset temperature, the power battery is heated to the first target temperature.

5. The low temperature charging control method according to claim 1, characterized in that: After controlling the on-board charging device to charge the power battery with the limited output power, the method further includes: Real-time monitoring of whether the maximum charging power of the power battery is lower than the limited output power of the on-board charging device; When the maximum charging power of the power battery is lower than the limited output power of the on-board charging device, the power battery is heated to a second target temperature; the second target temperature is determined based on the first target temperature, the current minimum temperature of the power battery and the minimum temperature of the power battery at the end of the last heating.

6. The low temperature charging control method according to any one of claims 1 to 5, characterized in that: The first target temperature is set based on the battery health state of the power battery.

7. The low temperature charging control method according to claim 1, characterized in that: After controlling the on-board charging device to charge the power battery with the limited output power, the method further includes: When it is detected that the charging state of the power battery meets the pre-input charging instruction information, the charging is terminated.

8. A low temperature charging control device, characterized in that: The device comprises: a determination module, a heating module and a control module; The determination module is used to determine the maximum charging power of the power battery based on the real-time status information of the power battery; The heating module is used to heat the power battery to a first target temperature when the maximum charging power of the power battery is lower than the limited output power of the on-board charging device; wherein the difference between the limited output power and the maximum output power of the on-board charging device is less than a preset power threshold; and the maximum charging power of the power battery at the first target temperature is not lower than the limited output power; The control module is used to control the on-board charging device to charge the power battery at the limited output power.

9. A low temperature charging control system, characterized in that: The system includes a processing module and a vehicle thermal management system for heating a power battery; wherein the processing module is used to execute the steps of the low-temperature charging control method according to any one of claims 1 to 7.

10. 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 low temperature charging control method according to any one of claims 1 to 7 are implemented.

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