Power battery pack heating control method and vehicle

Abstract

The application provides a power battery pack heating control method and a vehicle. The current body temperature of the power battery pack is obtained, the current heating entering temperature threshold of the power battery pack is determined according to preset data, and it is judged whether the current body temperature is lower than the current heating entering temperature threshold. If yes, the power battery pack is heated, the heating control based on the battery pack temperature is realized, the power battery pack is heated in time, the influence of the power battery pack on the power performance and the endurance of the vehicle in a low-temperature environment can be avoided, the power performance and the endurance of the vehicle are improved, and the aging of the power battery pack can be reduced, and the service life of the power battery pack is ensured.

Description

Technical Field

[0001] This application relates to the field of power battery pack technology, and in particular to a power battery pack heating control method and vehicle. Background Technology

[0002] Given the increasingly stringent requirements for fuel consumption and emissions in automobiles, domestic and foreign OEMs are paying more and more attention to the research and development of new energy vehicles. Among them, the power battery pack, as one of the power sources of new energy vehicles (hybrid models also include the engine), is a key research and development component for new energy vehicles.

[0003] In low-temperature environments, the available energy and power of the power battery pack decrease significantly, severely impacting the vehicle's power performance and range. The higher the discharge rate, the more severe the degradation. Furthermore, long-term use in low-temperature environments will accelerate the aging of the power battery pack and shorten its lifespan. Summary of the Invention

[0004] In view of this, the purpose of this application is to propose a power battery pack heating control method and vehicle, so as to realize the heating of the power battery pack, improve the overall vehicle power performance and range, and reduce the aging of the power battery pack.

[0005] To achieve the above objectives, this application provides a method for controlling the heating of a power battery pack, comprising:

[0006] Obtain the current internal temperature of the power battery pack in the vehicle;

[0007] Based on preset data, the current heating entry temperature threshold of the power battery pack is determined, and it is determined whether the current body temperature is lower than the current heating entry temperature threshold. If so, the power battery pack is heated.

[0008] Optionally, the preset data includes first data, and determining the current heating threshold of the power battery pack based on the preset data includes:

[0009] When the vehicle is currently in a driving state, the current heating threshold is determined based on the first data and the current remaining charge of the power battery pack.

[0010] The first data is used to represent the correspondence between each remaining power and each heating entry temperature threshold. The higher the remaining power, the lower the corresponding heating entry temperature threshold.

[0011] Optionally, the method further includes:

[0012] Obtain the current heating exit temperature of the power battery pack;

[0013] Accordingly, after heating the power battery pack, the process further includes:

[0014] The current body temperature of the power battery pack is re-acquired, and it is determined whether the new current body temperature exceeds the current heating exit temperature. If so, the heating of the power battery pack is canceled.

[0015] Optionally, obtaining the current heating exit temperature of the power battery pack includes:

[0016] In the first data, the heating entry temperature that is closest to the current body temperature under the current remaining power is determined to obtain the current heating entry temperature. The first data is also used to represent at least one heating entry temperature under each remaining power, and the heating exit temperature corresponding to each heating entry temperature.

[0017] In the first data, the heating exit temperature corresponding to the current heating entry temperature is queried to obtain the current heating exit temperature.

[0018] Optionally, after heating the power battery pack, the method further includes:

[0019] When the vehicle is currently in a driving state, during the heating process of the power battery pack, it is determined whether the vehicle has a passenger compartment heating request.

[0020] If so, the current body temperature of the power battery pack is re-acquired. If the new current body temperature is lower than the preset first temperature threshold, the passenger compartment of the vehicle is heated. If the new current body temperature is not lower than the preset first temperature threshold, the heating of the power battery pack is stopped. After the passenger compartment is heated to the preset temperature, the heating of the power battery pack is resumed.

[0021] Optionally, the preset data includes second data, and determining the current heating threshold of the power battery pack based on the preset data includes:

[0022] If the vehicle is currently in a charging state, the current heating threshold is determined based on the charging mode of the power battery pack and the second data.

[0023] The second data is used to represent the correspondence between each charging mode and each heating entry temperature threshold.

[0024] Optionally, after heating the power battery pack, the method further includes:

[0025] If the vehicle is currently in a charging state, during the heating process of the power battery pack, it is determined whether the vehicle has a passenger compartment heating request.

[0026] If so, then the passenger compartment of the vehicle is heated.

[0027] Optionally, before heating the passenger compartment of the vehicle, the method further includes:

[0028] Reacquire the current body temperature of the power battery pack and determine whether the new current body temperature is lower than the preset limit temperature corresponding to the charging mode of the power battery pack.

[0029] If so, then the step of heating the passenger compartment of the vehicle is performed.

[0030] Optionally, heating the power battery pack includes:

[0031] Turn on the heat source and adjust the control valve in the power battery pack circuit to the open state of the power battery pack's heating circuit, so that the heat provided by the heat source is transferred to the liquid cooling plate of the power battery pack through the heating circuit, wherein the liquid cooling plate is used to conduct heat to the power battery pack; or,

[0032] Turn on the compressor in the air conditioning heat pump system and connect the air conditioning heat pump system to the power battery pack circuit so that the air conditioning heat pump system provides heat and transfers the provided heat to the power battery pack.

[0033] For the same purpose, this application also provides a power battery pack heating control device, comprising:

[0034] The acquisition module is used to acquire the current body temperature of the power battery pack in the vehicle;

[0035] The judgment module is used to determine the current heating entry temperature threshold of the power battery pack based on preset data, and to determine whether the current body temperature is lower than the current heating entry temperature threshold. If so, the power battery pack is heated.

[0036] For the same purpose, this application also provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the method provided in any embodiment of this application.

[0037] For the same purpose, this application also provides a vehicle, said vehicle comprising:

[0038] Memory, used to store executable program code;

[0039] A processor is configured to call and run the executable program code from the memory, causing the vehicle to perform electronic equipment as provided in any embodiment of this application.

[0040] As can be seen from the above, the power battery pack heating control method provided in this application obtains the current body temperature of the power battery pack, determines the current heating entry temperature threshold of the power battery pack based on preset data, and determines whether the current body temperature is lower than the current heating entry temperature threshold. If so, the power battery pack is heated, thus realizing heating control based on battery pack temperature. By heating the power battery pack in a timely manner, the impact of the power battery pack on the vehicle's power performance and range under low temperature conditions can be avoided, thereby improving the vehicle's power performance and range. Furthermore, it can also reduce the aging of the power battery pack and ensure its service life. Attached Figure Description

[0041] To more clearly illustrate the technical solutions in this application or related technologies, the drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0042] Figure 1 A flowchart of a power battery pack heating control method provided in this application embodiment;

[0043] Figure 2 A flowchart illustrating another power battery pack heating control method provided in this application embodiment;

[0044] Figure 3 A schematic diagram of a heating control strategy for a power battery pack provided in an embodiment of this application;

[0045] Figure 4 A schematic diagram illustrating battery pack coolant heating as provided in an embodiment of this application;

[0046] Figure 5 A schematic diagram of a battery pack refrigerant direct heating provided in an embodiment of this application;

[0047] Figure 6 This is a schematic diagram of the structure of a power battery pack heating control device provided in an embodiment of this application;

[0048] Figure 7 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application. Detailed Implementation

[0049] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with specific embodiments and the accompanying drawings.

[0050] It should be noted that, unless otherwise defined, the technical or scientific terms used in the embodiments of this application should have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "first," "second," and similar terms used in the embodiments of this application do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are only used to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0051] Currently, the design process for new energy vehicles places high demands on both range and power performance, while also requiring control over overall vehicle cost and weight. Therefore, the industry is pursuing power battery packs with high energy density, small size and weight, long lifespan, and low self-discharge rate. Ternary lithium and lithium iron phosphate battery packs perfectly meet the needs of new energy vehicles. However, when these lithium-ion batteries are used at low temperatures, the lithium ions on the graphite anode may be reduced to metallic lithium, resulting in lithium plating. Lithium plating in the battery pack causes a rapid decrease in capacity; furthermore, the deposited metallic lithium forming lithium dendrites may puncture the separator, inducing internal short circuits and potentially leading to thermal runaway of the power battery pack.

[0052] At low temperatures, the electrolyte viscosity in a power battery pack increases, slowing down ion conduction. The lower the temperature, the lower the activity of the lithium-ion battery, directly leading to a significant decrease in charge and discharge efficiency. This causes a mismatch in electron migration speed in the external circuit, resulting in severe battery polarization and a sharp drop in charge and discharge capacity. The lower the battery pack temperature, the greater the initial voltage drop at the battery terminals. This is because as the temperature decreases, the battery impedance increases, leading to a greater voltage drop due to the internal resistance, thus reducing the battery's terminal voltage and deteriorating its power characteristics.

[0053] Therefore, in order to solve the above problems, this invention provides a power battery pack heating control method, which can realize timely heating of the power battery pack, improve the vehicle's power performance and range, and reduce the aging of the power battery pack.

[0054] Figure 1 This document presents a flowchart of a power battery pack heating control method according to an embodiment of this application. This method is applicable to heating power battery packs in new energy vehicles. The method can be executed by a power battery pack heating control device, which can be integrated into an electronic device via hardware and / or software, such as within a battery management system. Figure 1 As shown, the method includes the following steps:

[0055] S110: Obtain the current body temperature of the power battery pack in the vehicle.

[0056] In this embodiment, the current body temperature can be the lowest single cell temperature in the power battery pack at the current moment.

[0057] For example, the temperature of each cell in the power battery pack can be collected by a temperature sensor, and the lowest cell temperature can be determined as the current body temperature of the power battery pack.

[0058] S120. Based on preset data, determine the current heating entry temperature threshold of the power battery pack, and determine whether the current body temperature is lower than the current heating entry temperature threshold. If so, heat the power battery pack.

[0059] The heating threshold temperature can be the highest temperature at which the battery pack can enter heating mode with the corresponding remaining charge. Preset data can be used to describe the heating threshold temperature of the battery pack, and this preset data can be obtained through actual vehicle calibration.

[0060] For example, a unified heating entry temperature threshold can be obtained based on preset data and used as the current heating entry temperature threshold to determine whether the power battery pack needs to be heated.

[0061] Heating the battery pack during driving consumes electricity, reducing its usable capacity and thus affecting range. Using a uniform temperature threshold to determine whether battery pack heating is necessary might result in low overall vehicle range. Therefore, in this embodiment, considering that the battery discharge power at high temperature and low SOC (State of Charge, also known as remaining charge) and low temperature and high SOC can meet the vehicle's power requirements, a lower heating threshold at high SOC reduces heating of the battery pack, while a higher heating threshold at low SOC ensures the battery pack is heated to the required discharge power. This optimizes heating energy consumption while ensuring the battery pack's discharge power meets power requirements, thereby improving the vehicle's range.

[0062] In one specific implementation, the preset data includes first data. Determining the current heating entry temperature threshold of the power battery pack based on the preset data includes: when the vehicle is currently in a driving state, determining the current heating entry temperature threshold based on the first data and the current remaining charge of the power battery pack; wherein, the first data is used to represent the correspondence between each remaining charge and each heating entry temperature threshold, and the higher the remaining charge, the lower the corresponding heating entry temperature threshold.

[0063] Among them, the current remaining power can be the SOC of the power battery pack at the current moment; the first data can include each pre-calibrated remaining power and the corresponding heating entry temperature threshold.

[0064] For example, based on the charge and discharge map of the power battery pack, the critical temperature at which the discharge power of the power battery pack meets the power requirements of the vehicle at each remaining charge level can be obtained. Then, the heating entry temperature threshold corresponding to each remaining charge level can be determined by the critical temperature at each remaining charge level. For example, the value below the critical temperature can be determined as the heating entry temperature threshold.

[0065] Specifically, the current status of the vehicle can be obtained first. If the current status of the vehicle is driving, the heating entry temperature threshold corresponding to the current remaining power in the first data can be used as the current heating entry temperature threshold.

[0066] It should be noted that in the charge / discharge map of the power battery pack, the discharge power of the battery under high temperature and low SOC and low temperature and high SOC conditions can meet the power requirements of the entire vehicle. Therefore, it can be seen that the power battery pack needs to maintain a relatively high temperature at low SOC to meet the discharge power requirements, while the power battery pack only needs a relatively low temperature at high SOC to meet the discharge power requirements.

[0067] Therefore, in the first data, a higher heating entry temperature threshold can be preset at low SOC to ensure that the power battery pack at low SOC is heated to a higher temperature to meet the discharge requirements. Conversely, a lower heating entry temperature threshold can be preset at high SOC to ensure that the power battery pack at high SOC is not heated to a higher temperature to minimize heating energy consumption while meeting the discharge requirements. Furthermore, in the first data, the higher the remaining charge, the lower the corresponding heating entry temperature threshold.

[0068] In this embodiment, the first data corresponding to different types of power battery packs can be different. Specifically, the first data can be set according to the charge and discharge map of the power battery pack. For example, Table 1 shows one type of first data. As shown in Table 1, the first data can include the heating entry temperature for each remaining charge level, where the heating entry temperature refers to the body temperature at which the power battery pack can be heated. For each remaining charge level, the maximum value among the corresponding heating entry temperatures is the heating entry temperature threshold. For example, when SOC < 15%, the corresponding heating entry temperatures include 5℃, 0℃, -5℃, -10℃, and -15℃, and the corresponding heating entry temperature threshold is 5℃.

[0069] Table 1. First type of data

[0070]

[0071] In this embodiment, in addition to the first data shown in Table 1, the first data can also be directly composed of each remaining power and the heating entry temperature threshold corresponding to each remaining power, as shown in Table 2. Table 2 shows another type of first data.

[0072] Table 2 Another type of first data

[0073] ＜15 15≤SOC<25 25≤SOC<40 40≤SOC<50 50 ≤ SOC < 60% SOC ≥ 60% 5℃ 0℃ -5℃ -10℃ -15℃ (Without heating)

[0074] It should be noted that for extremely high remaining battery capacity, heating is not required; that is, the battery pack does not need heating at any body temperature. Therefore, in the first data set, for extremely high remaining battery capacity, a corresponding heating threshold can be omitted, or the corresponding heating threshold can be set to an extreme value (a value that the battery pack's body temperature cannot reach), such as -50℃. If no current heating threshold corresponding to the current remaining battery capacity of the battery pack is found in the first data set, then heating of the battery pack is not required.

[0075] In the above implementation, under driving conditions, the corresponding current heating entry temperature threshold is obtained through preset data and the current remaining power. Considering that the battery discharge power under high temperature and low power and low temperature and high power conditions in the charging and discharging calibration diagram of the power battery pack can meet the power requirements of the vehicle, a lower heating entry temperature threshold is obtained when the remaining power is high, and a higher heating entry temperature threshold is obtained when the remaining power is low. Then, the power battery pack is heated when the current body temperature does not exceed the current heating entry temperature threshold. This method reduces the heating of the battery pack under high power by using a lower heating entry temperature threshold under high power, and uses a higher heating entry temperature threshold under low power to heat the battery pack as much as possible to meet the discharge power requirements. While ensuring that the battery pack discharge power meets the power requirements, the heating energy consumption is optimized, thereby improving the vehicle's range.

[0076] It should be noted that, compared with the prior art, the above implementation method adds the condition of judging the current remaining power of the power battery pack. The improved method provided in this embodiment can set different SOC threshold ranges according to the charging and discharging power capability of the battery pack, and only heat the power battery pack at the corresponding temperature and SOC threshold. The existing solution only judges the temperature of the power battery pack and does not identify its SOC threshold. Therefore, a strategy of heating the battery pack will occur when SOC ≥ 60%. However, when SOC ≥ 60%, the battery pack has a strong external power performance and does not need to be heated. Therefore, the existing solution wastes some energy. The improved method provided by the above implementation method can rationally allocate energy and only heat the battery pack when it needs to be heated, avoiding energy waste and making the whole vehicle more energy-efficient.

[0077] Furthermore, if the current temperature of the power battery pack is lower than the current heating threshold, it means that the discharge power of the power battery pack does not meet the power requirements of the vehicle at the current moment, and the power battery pack can be heated at this time.

[0078] The power battery pack heating control method provided in this application obtains the current body temperature of the power battery pack, determines the current heating entry temperature threshold of the power battery pack based on preset data, and determines whether the current body temperature is lower than the current heating entry temperature threshold. If so, the power battery pack is heated, thus realizing heating control based on battery pack temperature. By heating the power battery pack in a timely manner, the impact of the power battery pack on the vehicle's power performance and range under low temperature conditions can be avoided, thereby improving the vehicle's power performance and range. Furthermore, it can also reduce the aging of the power battery pack and ensure its service life.

[0079] Considering that the temperature of the power battery pack can reach the critical temperature required to meet the power performance of the vehicle during the heating process, in order to further reduce heating energy consumption, the heating process of the power battery pack can be monitored, and heating can be stopped after a certain temperature is reached.

[0080] Optionally, the method provided in this application embodiment further includes: obtaining the current heating exit temperature of the power battery pack; correspondingly, after heating the power battery pack, it further includes: re-obtaining the current body temperature of the power battery pack, determining whether the new current body temperature exceeds the current heating exit temperature, and if so, canceling the heating of the power battery pack.

[0081] The current heating exit temperature can be the temperature at which the power battery pack exits heating, corresponding to the current remaining charge. The current heating exit temperature can be a pre-set uniform temperature, such as the critical temperature at which the power battery pack's discharge power meets the vehicle's power requirements; or, the current heating exit temperature can be obtained from the first set of data based on the current remaining charge and the current battery pack temperature.

[0082] In one specific implementation, obtaining the current heating exit temperature of the power battery pack includes: determining, in the first data, the heating entry temperature closest to the current body temperature under the current remaining charge, to obtain the current heating entry temperature, wherein the first data is further used to represent at least one heating entry temperature under each remaining charge, and the heating exit temperature corresponding to each heating entry temperature; querying the heating exit temperature corresponding to the current heating entry temperature in the first data to obtain the current heating exit temperature.

[0083] For example, as shown in Table 1, the first data can describe at least one heating entry temperature for each remaining power level, and the heating exit temperature corresponding to each heating entry temperature. Specifically, among the heating entry temperatures for the current remaining power level in the first data, the heating entry temperature closest to the current body temperature can be determined, and the heating exit temperature corresponding to that heating entry temperature can be used as the current heating exit temperature.

[0084] This implementation method enables accurate determination of the heating exit temperature at the current moment, allowing for different heating exit temperatures to be determined under different body temperatures, further reducing the heating energy consumption of the power battery pack and improving the overall vehicle range.

[0085] Furthermore, during the heating process of the power battery pack, the current body temperature of the power battery pack can be re-acquired at preset intervals, and then it can be determined whether the new current body temperature exceeds the current heating exit temperature. If it does, the heating of the power battery pack is stopped; otherwise, the heating of the power battery pack continues.

[0086] In the above embodiments, by detecting whether the new current body temperature exceeds the current heating exit temperature during the heating process of the power battery pack, heating can be stopped in time when the power battery pack is heated to meet the power requirements, further reducing heating energy consumption and improving the vehicle's range.

[0087] In this embodiment, considering that during the heating process of the power battery pack, there may be situations where users have heating needs for the passenger compartment, such as when users turn on the passenger compartment heating, since the power battery pack and the passenger compartment share a heat source, the heating priority order of the power battery pack and the passenger compartment can be determined based on comfort, economy, and power performance.

[0088] Optionally, after heating the power battery pack, the method further includes: when the vehicle is currently in a driving state, during the process of heating the power battery pack, determining whether there is a request for heating the passenger compartment; if so, re-acquiring the current body temperature of the power battery pack; if the new current body temperature is lower than a preset first temperature threshold, heating the passenger compartment of the vehicle; if the new current body temperature is not lower than the preset first temperature threshold, stopping the heating of the power battery pack; and after heating the passenger compartment to a preset temperature, resuming the heating of the power battery pack.

[0089] The preset first temperature threshold can be a pre-set body temperature that distinguishes the urgency of heating of the power battery pack. The preset temperature can be a pre-set passenger cabin temperature at which a certain level of passenger cabin comfort is achieved.

[0090] Specifically, when the vehicle is in motion, if a passenger compartment heating request is detected, the current body temperature can be re-acquired. If the new current body temperature is lower than the preset first temperature threshold, it indicates that the temperature of the power battery pack is too low and the heating of the power battery pack is urgent. At this time, there is no need to restrict the heating of the power battery pack. While heating the power battery pack, the passenger compartment of the vehicle can also be heated at the same time.

[0091] Furthermore, if the new current body temperature is not lower than the preset first temperature threshold, it indicates that the temperature of the power battery pack is moderate and the urgency of heating the power battery pack is low. At this time, the heating of the power battery pack can be restricted first, that is, the heating of the power battery pack can be stopped. After the passenger compartment is heated to the preset temperature, the heating restriction on the power battery pack can be lifted, so as to achieve synchronous heating of the power battery pack and the passenger compartment.

[0092] For example, Table 3 illustrates a heating priority strategy for the power battery pack and passenger compartment during vehicle operation. As shown in Table 3, the preset first temperature threshold can be -22℃. That is, when the new current body temperature of the power battery pack is less than -22℃, the heating priority strategy can be determined as battery pack priority, meaning the power battery pack is heated normally, and the passenger compartment heating is turned on normally. When the new current body temperature of the power battery pack is not less than -22℃, the heating priority strategy can be determined as passenger compartment priority, meaning the passenger compartment heating is turned on normally, and the heating demand of the power battery pack is not responded to. When the passenger compartment is heated to the preset temperature, the heating demand of the power battery pack is responded to normally.

[0093] Table 3 Heating priority strategies for the power battery pack and passenger compartment during driving conditions.

[0094]

[0095] It should be noted that after the initial heating priority strategy for the power battery pack and passenger compartment is determined, the current body temperature of the power battery pack can be monitored in real time, and the heating priority strategy can be adjusted according to the current body temperature. For example, if the current body temperature of the power battery pack is less than -22℃, the heating priority strategy can be initially determined as battery pack priority. When the current body temperature of the power battery pack reaches -20℃, i.e., the upward temperature in Table 3, the strategy can be upgraded to the next heating priority strategy, i.e., passenger compartment priority. Furthermore, when the current body temperature of the power battery pack reaches -10℃, the strategy can continue to upgrade to the next heating priority strategy, i.e., passenger compartment priority.

[0096] Through the above implementation method, the heating priority of the power battery pack and passenger compartment is realized in the driving state. By prioritizing the design, the urgency of heating the power battery pack can be distinguished according to the temperature of the power battery pack itself. When the temperature of the power battery pack is not too low, the passenger compartment is heated first, which can ensure the vehicle's power requirements, while improving the overall vehicle comfort and the temperature rise rate of the passenger compartment, thereby improving the user's riding experience.

[0097] Furthermore, considering that the power battery pack and passenger compartment share a heat source, the power, size, weight, and cost of the shared heat source increase significantly when it meets the heating requirements of both the power battery pack and passenger compartment, thus reducing the economic efficiency of vehicle design. Therefore, by prioritizing the design, the situation where the power battery pack and passenger compartment use a shared heat source at the same time can be avoided as much as possible, thereby improving the overall economic efficiency of the vehicle.

[0098] Figure 2 This flowchart illustrates another power battery pack heating control method provided in this application embodiment, demonstrating the process of determining the current heating threshold during charging, based on the aforementioned embodiments. Figure 2 As shown, the method includes the following steps:

[0099] S210: Obtain the current body temperature of the power battery pack in the vehicle.

[0100] S220. If the vehicle is currently in a charging state, determine the current heating threshold based on the charging mode of the power battery pack and the second data.

[0101] The power battery pack can be charged in either fast charging or slow charging modes. In slow charging mode, the vehicle is connected to a charging gun and charged via an onboard charger; in fast charging mode, the vehicle is connected to a charging gun and charging is controlled by a battery pack controller.

[0102] The second set of data is used to represent the correspondence between each charging mode and each heating entry temperature threshold. Specifically, different charging modes may correspond to different heating entry temperature thresholds. For example, Table 4 shows one type of second set of data.

[0103] Table 4. A second type of data

[0104]

[0105] As shown in Table 4, the heating threshold in slow charging mode can be 5℃, and the heating threshold in fast charging mode can be 15℃. The second set of data can also be used to represent the correspondence between each charging mode and each heating exit temperature threshold. Referring to Table 4, the heating exit temperature threshold in slow charging mode can be 10℃, and the heating exit temperature threshold in fast charging mode can be 20℃.

[0106] It should be noted that the heating entry temperature threshold in fast charging mode is higher than that in slow charging mode, and the heating exit temperature threshold in fast charging mode is higher than that in slow charging mode. The reason for this is that fast charging mode requires the power battery pack to be charged quickly, so the temperature requirement for the power battery pack is higher in fast charging mode, and the power battery pack needs to be kept at a higher temperature to improve charging efficiency.

[0107] S230: Determine whether the current body temperature is lower than the current heating entry temperature threshold. If so, heat the power battery pack.

[0108] Specifically, if the current body temperature of the power battery pack is lower than the current heating entry temperature threshold, it can be determined that the power battery pack needs to be heated. Furthermore, the power battery pack can be heated until the current body temperature after heating is higher than the current heating exit temperature threshold, at which point the heating of the power battery pack can be cancelled.

[0109] In one optional implementation, after heating the power battery pack, the method further includes: if the vehicle is currently in a charging state, during the heating process of the power battery pack, determining whether the vehicle has a passenger compartment heating request; if so, heating the passenger compartment of the vehicle.

[0110] When the vehicle is in driving mode, the heating priority strategy for the power battery pack and passenger compartment can be battery priority, meaning that the heating of the power battery pack is unrestricted and the passenger compartment heating is turned on normally.

[0111] Specifically, when the vehicle is charging and the power battery pack is heating up, if there is a need to heat the passenger compartment, the passenger compartment can be heated at the same time as the power battery pack.

[0112] In the above embodiments, if a passenger compartment heating request is detected during charging, the heating of the power battery pack can be unrestricted, enabling rapid charging of the power battery pack. The power battery pack can be rapidly raised to the maximum charging power temperature point with maximum heating performance, thereby improving the charging speed.

[0113] In one example, before heating the passenger compartment of the vehicle, the method further includes: re-acquiring the current body temperature of the power battery pack, determining whether the new current body temperature is lower than the preset limit temperature corresponding to the charging mode of the power battery pack; if so, then performing the step of heating the passenger compartment of the vehicle.

[0114] The preset limit temperature can be a critical temperature that limits the heating of the power battery pack. For example, the preset limit temperature can be the temperature at which the power battery pack achieves high charging efficiency. Considering that fast charging mode and slow charging mode have different requirements for the charging efficiency of the power battery pack, in this embodiment, the preset limit temperature corresponding to fast charging mode and the preset limit temperature corresponding to slow charging mode can be different.

[0115] For example, Table 5 shows a heating priority strategy for the power battery pack and passenger compartment in fast charging mode, and Table 6 shows a heating priority strategy for the power battery pack and passenger compartment in slow charging mode. As shown in Tables 5 and 6, in fast charging mode, when the body temperature of the power battery pack is ≤15℃, the heating priority strategy prioritizes the power battery pack, meaning that heating of the power battery pack is not restricted, and both the passenger compartment and the power battery pack are heated together. In slow charging mode, when the body temperature of the power battery pack is ≤5℃, the heating priority strategy prioritizes the power battery pack, meaning that heating of the power battery pack is not restricted, and both the passenger compartment and the power battery pack are heated together. Therefore, the preset limit temperature for fast charging mode can be set to 16℃, and the preset limit temperature for slow charging mode can be set to 6℃.

[0116] Table 5. Heating priority strategy for the power battery pack and passenger compartment in fast charging mode.

[0117]

[0118] Table 6. Heating priority strategy for the power battery pack and passenger compartment in slow charging mode.

[0119]

[0120] Specifically, if the new current body temperature is lower than the preset limit temperature corresponding to the charging mode, it means that there is no need to limit the heating of the power battery pack at this time. The passenger compartment can be heated at the same time according to the passenger compartment heating request, so as to achieve fast charging of the power battery pack while responding to the passenger compartment heating needs as much as possible.

[0121] If the current body temperature is not lower than the preset limit temperature corresponding to the charging mode, it indicates that the battery pack temperature has reached a certain value. Limiting the heating of the battery pack will not significantly affect its charging efficiency. Specifically, the heating of the battery pack can be limited first, i.e., heating of the battery pack can be stopped, and the passenger compartment can be heated to the preset temperature before resuming heating of the battery pack. In this way, during charging mode, the passenger compartment can be quickly heated while ensuring the charging efficiency of the battery pack, improving the user's riding experience.

[0122] The power battery pack heating control method provided in this application obtains the current heating entry temperature threshold through the charging mode and second data during the charging state. Then, it determines whether the power battery pack needs to be heated based on the current body temperature of the power battery pack. If so, the power battery pack is heated, thus achieving accurate heating of the power battery pack during the charging state. By distinguishing between fast charging mode and slow charging mode to obtain different current heating entry temperature thresholds, it avoids heating the power battery pack to excessively high temperatures in slow charging mode, further reducing heating energy consumption and improving the vehicle's range.

[0123] For example, Figure 3 This is a schematic diagram illustrating a heating control strategy for a power battery pack provided in an embodiment of this application. Figure 3 As shown, after the vehicle is started, the status of the vehicle's power system can be determined first. If it is in driving mode, the vehicle's SOC and battery pack temperature are detected, and the timing for the battery pack heating to start is determined based on the SOC and the lowest temperature of the battery pack. If it is in charging mode, the battery pack temperature is detected, and the timing for the battery pack heating to start is determined based on the lowest temperature of the battery pack.

[0124] Furthermore, it determines whether heating is required. If not, the battery pack heating is turned off, and related heating system components do not operate. If so, during the heating of the power battery pack, it determines whether there is a need for passenger compartment heating. If not, the power battery pack is heated according to the heating control strategy for a single battery in driving or charging states. If so, the battery pack is heated according to the corresponding heating priority strategy in driving state and in charging state. During the heating process, it determines whether the power battery pack meets the heating requirements. If so, the battery pack heating is completed, and the control strategy is exited.

[0125] In this embodiment, two heating schemes are provided for heating the power battery pack: a battery pack coolant heating scheme and a battery pack refrigerant direct heating scheme.

[0126] Figure 4 This is a schematic diagram of a battery pack coolant heating method provided in an embodiment of this application, as shown below. Figure 4 As shown, (1) is the power supply, (2) is the blower, (3) is the heater core, (4) is water pump 1, (5) is the power battery pack, (6) is the heat exchanger, (7) is the three-way valve, (8) is the three-way pipe, and (9) is water pump 2. A liquid cooling plate can be integrated inside the power battery pack, and a water temperature sensor is integrated at the inlet of the liquid cooling plate. When the inlet water temperature exceeds the protection threshold of the power battery pack, the heating of the power battery pack can be stopped to ensure the safety of the power battery pack.

[0127] exist Figure 4 In the provided heating scheme, the heat from the heat source passes through the warm air core to the heat exchanger. After heat exchange in the heat exchanger (6), the heat is transferred to the liquid cooling plate of the power battery pack. The liquid cooling plate conducts the heat to each module of the power battery pack. The high-temperature side flow path is: (1)→(3)→(7) (valve ports 1 and 2 are open)→(6) (high-temperature side)→(8)→(9)→(1); the low-temperature side flow path is: (4)→(5)→(6) (low-temperature side)→(4). The heating path of the passenger compartment is: when the battery pack is heated, (1)→(3)→(7) (valve ports 1 and 2 are open)→(6) (high-temperature side)→(8)→(9)→(1), and when the battery pack is not heated, (1)→(3)→(7) (valve ports 1 and 3 are open)→(8)→(9)→(1). Among them, the blower (2) can blow the heat released by the warm air core into the crew cabin through the air duct to heat the crew cabin.

[0128] Figure 5 This is a schematic diagram of a direct refrigerant heating method for a battery pack, as provided in an embodiment of this application. Figure 5 As shown, (1) is the outdoor heat exchanger, (2) is the gas-liquid separator, (3) is the compressor, (4) is the shut-off valve 1, (5) is the blower, (6) is the indoor heat exchanger, (7) is the shut-off valve 2, (8) is the power battery pack, (9) is the three-way pipe, and (10) is the ball valve.

[0129] exist Figure 5 In the provided heating scheme, the heat exchange medium in the flow path is refrigerant. The direct heating function of the power battery pack is implemented through the following path: (3)→(7)→(8)→(9)→(10)→(1)→(2)→(3); the direct heating function of the passenger compartment is implemented through the following path: (3)→(4)→(6)→(9)→(10)→(1)→(2)→(3). The blower (5) delivers the heat released by the indoor heat exchanger to the passenger compartment through the air conditioning unit duct to achieve passenger compartment heating.

[0130] In one specific embodiment, heating the power battery pack includes: turning on a heat source and adjusting a control valve in the power battery pack circuit to the state where the heating circuit of the power battery pack is open, so that the heat provided by the heat source is transferred to the liquid cooling plate of the power battery pack through the heating circuit, wherein the liquid cooling plate is used to conduct heat to the power battery pack; or, turning on the compressor in the air conditioning heat pump system and connecting the air conditioning heat pump system to the power battery pack circuit, so that the air conditioning heat pump system provides heat and transfers the provided heat to the power battery pack.

[0131] Specifically, if the power battery pack needs to be heated, such as... Figure 4 As shown, the heat source can be turned on, and the control valve (such as a three-way valve) in the power battery pack circuit can be adjusted to open the heating circuit of the power battery pack. This allows the heat provided by the heat source to be transferred to the liquid cooling plate of the power battery pack through the heating circuit, thereby heating the power battery. Conversely, to cancel the heating of the power battery pack, the control valve (such as a three-way valve) can be adjusted to the closed state, thus shutting off the heat source and its water pump.

[0132] Alternatively, if it is necessary to heat the power battery pack, such as Figure 5 As shown, the compressor in the air conditioning heat pump system can be turned on, connecting the system to the battery pack circuit. This can be achieved by opening the ball valve of the outdoor heat exchanger and the shut-off valve of the battery pack, allowing the heat pump system to provide heat. This heat can then be transferred to the battery pack through the shut-off valve. Conversely, to cancel heating of the battery pack, the compressor can be turned off, disconnecting the heat pump system from the battery pack circuit. This can be done by closing the ball valve and the shut-off valve.

[0133] The above two heating methods can achieve automatic heating of the power battery pack, making the power battery pack heating control method provided in this application applicable to both coolant-heated battery packs and refrigerant-direct-heated battery packs, thus ensuring the applicability of the method.

[0134] It should be noted that the method in this embodiment can be executed by a single device, such as a computer or server. The method can also be applied in a distributed scenario, where multiple devices cooperate to complete the task. In such a distributed scenario, one of these devices may execute only one or more steps of the method in this embodiment, and the multiple devices will interact with each other to complete the method described.

[0135] It should be noted that the above description describes some embodiments of this application. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recorded in the claims can be performed in a different order than that shown in the above embodiments and still achieve the desired result. Furthermore, the processes depicted in the drawings do not necessarily require a specific or sequential order to achieve the desired result. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0136] Based on the same inventive concept, and corresponding to any of the above embodiments, this application also provides a power battery pack heating control device. Figure 6 This is a schematic diagram of the structure of a power battery pack heating control device provided in an embodiment of this application, with reference to... Figure 6 The power battery pack heating control device includes an acquisition module 610 and a judgment module 620, wherein:

[0137] The acquisition module 610 is used to acquire the current body temperature of the power battery pack in the vehicle;

[0138] The judgment module 620 is used to determine the current heating entry temperature threshold of the power battery pack based on preset data, and to determine whether the current body temperature is lower than the current heating entry temperature threshold. If so, the power battery pack is heated.

[0139] Optionally, the judgment module 620 is further configured to determine the current heating entry temperature threshold based on the first data and the current remaining charge of the power battery pack when the current state of the vehicle is driving; wherein, the first data is used to represent the correspondence between each remaining charge and each heating entry temperature threshold, and the higher the remaining charge, the lower the corresponding heating entry temperature threshold.

[0140] Optionally, the judgment module 620 is further configured to obtain the current heating exit temperature of the power battery pack. Correspondingly, the judgment module 620 is further configured to re-obtain the current body temperature of the power battery pack and determine whether the new current body temperature exceeds the current heating exit temperature. If so, the heating of the power battery pack is canceled.

[0141] Optionally, the judgment module 620 is further configured to determine, in the first data, the heating entry temperature that is closest to the current body temperature under the current remaining power, and obtain the current heating entry temperature, wherein the first data is further configured to represent at least one heating entry temperature under each remaining power, and the heating exit temperature corresponding to each heating entry temperature; and to query the heating exit temperature corresponding to the current heating entry temperature in the first data to obtain the current heating exit temperature.

[0142] Optionally, the determination module 620 is further configured to determine whether there is a passenger compartment heating request during the heating process of the power battery pack when the current state of the vehicle is driving; if so, then re-acquire the current body temperature of the power battery pack, and if the new current body temperature is lower than a preset first temperature threshold, heat the passenger compartment of the vehicle; if the new current body temperature is not lower than the preset first temperature threshold, stop heating the power battery pack, and after heating the passenger compartment to a preset temperature, resume heating the power battery pack.

[0143] Optionally, the determination module 620 is further configured to determine the current heating entry temperature threshold based on the charging mode of the power battery pack and the second data when the current state of the vehicle is a charging state; wherein the second data is used to represent the correspondence between each charging mode and each heating entry temperature threshold.

[0144] Optionally, the determination module 620 is further configured to determine whether the vehicle has a passenger compartment heating request during the heating process of the power battery pack when the current state of the vehicle is charging; if so, then the passenger compartment of the vehicle is heated.

[0145] Optionally, the judgment module 620 is further configured to reacquire the current body temperature of the power battery pack, determine whether the new current body temperature is less than the preset limit temperature corresponding to the charging mode of the power battery pack; if so, then execute the step of heating the passenger compartment of the vehicle.

[0146] Optionally, the judgment module 620 is further configured to turn on the heat source and adjust the control valve in the power battery pack circuit to the state where the heating circuit of the power battery pack is open, so that the heat provided by the heat source is transferred to the liquid cooling plate of the power battery pack through the heating circuit, wherein the liquid cooling plate is used to conduct heat to the power battery pack; or, turn on the compressor in the air conditioning heat pump system and connect the air conditioning heat pump system to the power battery pack circuit, so that the air conditioning heat pump system provides heat and transfers the provided heat to the power battery pack.

[0147] For ease of description, the above devices are described in terms of function, divided into various modules. Of course, in implementing this application, the functions of each module can be implemented in one or more software and / or hardware.

[0148] The apparatus described above is used to implement the corresponding power battery pack heating control method in any of the foregoing embodiments, and has the beneficial effects of the corresponding method embodiments, which will not be repeated here.

[0149] Based on the same inventive concept, corresponding to the methods of any of the above embodiments, this application also provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the power battery pack heating control method described in any of the above embodiments.

[0150] Figure 7 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application. Figure 7 A specific hardware structure of an electronic device is shown, which may include: a processor 1010, a memory 1020, an input / output interface 1030, a communication interface 1040, and a bus 1050. The processor 1010, memory 1020, input / output interface 1030, and communication interface 1040 are interconnected internally via the bus 1050.

[0151] The processor 1010 can be implemented using a general-purpose CPU (Central Processing Unit), microprocessor, application-specific integrated circuit (ASIC), or one or more integrated circuits, and is used to execute relevant programs to implement the technical solutions provided in the embodiments of this specification.

[0152] The memory 1020 can be implemented in the form of ROM (Read Only Memory), RAM (Random Access Memory), static storage device, dynamic storage device, etc. The memory 1020 can store the operating system and other applications. When the technical solutions provided in the embodiments of this specification are implemented by software or firmware, the relevant program code is stored in the memory 1020 and is called and executed by the processor 1010.

[0153] The input / output interface 1030 is used to connect input / output modules to realize information input and output. Input / output modules can be configured as components within the device (not shown in the figure) or externally connected to the device to provide corresponding functions. Input devices may include keyboards, mice, touchscreens, microphones, various sensors, etc., while output devices may include displays, speakers, vibrators, indicator lights, etc.

[0154] The communication interface 1040 is used to connect a communication module (not shown in the figure) to enable communication between this device and other devices. The communication module can communicate via wired means (such as USB, Ethernet cable, etc.) or wireless means (such as mobile network, WIFI, Bluetooth, etc.).

[0155] Bus 1050 includes a pathway for transmitting information between various components of the device, such as processor 1010, memory 1020, input / output interface 1030, and communication interface 1040.

[0156] It should be noted that although the above-described device only shows the processor 1010, memory 1020, input / output interface 1030, communication interface 1040, and bus 1050, in specific implementations, the device may also include other components necessary for normal operation. Furthermore, those skilled in the art will understand that the above-described device may only include the components necessary for implementing the embodiments of this specification, and not necessarily all the components shown in the figures.

[0157] The electronic devices described above are used to implement the corresponding power battery pack heating control method in any of the foregoing embodiments, and have the beneficial effects of the corresponding method embodiments, which will not be repeated here.

[0158] Based on the same inventive concept, corresponding to the methods of any of the above embodiments, this application also provides a vehicle, which includes the electronic equipment described in any of the above embodiments.

[0159] Based on the same inventive concept, corresponding to the methods of any of the above embodiments, this application also provides a non-transitory computer-readable storage medium that stores computer instructions for causing the computer to execute the power battery pack heating control method as described in any of the above embodiments.

[0160] The computer-readable medium of this embodiment includes permanent and non-permanent, removable and non-removable media, and information storage can be implemented by any method or technology. Information can be computer-readable instructions, data structures, program modules, or other data. Examples of computer storage media include, but are not limited to, phase-change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, CD-ROM, digital versatile optical disc (DVD) or other optical storage, magnetic tape, magnetic magnetic disk storage or other magnetic storage devices, or any other non-transfer medium that can be used to store information accessible by a computing device.

[0161] The computer instructions stored in the storage medium of the above embodiments are used to cause the computer to execute the power battery pack heating control method as described in any of the above embodiments, and have the beneficial effects of the corresponding method embodiments, which will not be repeated here.

[0162] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of this application (including the claims) is limited to these examples; within the framework of this application, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of different aspects of the embodiments of this application as described above, which are not provided in the details for the sake of brevity.

[0163] Additionally, to simplify the description and discussion, and to avoid obscuring the embodiments of this application, the well-known power / ground connections to integrated circuit (IC) chips and other components may or may not be shown in the provided drawings. Furthermore, the apparatus may be shown in block diagram form to avoid obscuring the embodiments of this application, and this also takes into account the fact that the details of the implementation of these block diagram apparatuses are highly dependent on the platform on which the embodiments of this application will be implemented (i.e., these details should be fully understood by those skilled in the art). While specific details (e.g., circuits) have been set forth to describe exemplary embodiments of this application, it will be apparent to those skilled in the art that the embodiments of this application can be implemented without these specific details or with variations thereof. Therefore, these descriptions should be considered illustrative rather than restrictive.

[0164] Although this application has been described in conjunction with specific embodiments thereof, many substitutions, modifications, and variations of these embodiments will be apparent to those skilled in the art from the foregoing description. For example, other memory architectures (e.g., dynamic RAM (DRAM)) may be used with the embodiments discussed.

[0165] The embodiments of this application are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the embodiments of this application should be included within the protection scope of this application.

Claims

1. A method for controlling the heating of a power battery pack, characterized in that, include: Obtain the current internal temperature of the power battery pack in the vehicle; Based on preset data, the current heating entry temperature threshold of the power battery pack is determined, and it is determined whether the current body temperature is lower than the current heating entry temperature threshold. If so, the power battery pack is heated. The preset data includes first data, and determining the current heating threshold of the power battery pack based on the preset data includes: When the vehicle is currently in a driving state, the current heating threshold is determined based on the first data and the current remaining charge of the power battery pack. The first data is used to represent the correspondence between each remaining charge and each heating entry temperature threshold. The higher the remaining charge, the lower the corresponding heating entry temperature threshold. The critical temperature at which the discharge power of the power battery pack meets the vehicle's power requirements at each remaining charge is obtained based on the charge and discharge calibration diagram of the power battery pack. The heating entry temperature threshold corresponding to each remaining charge is determined by the critical temperature at each remaining charge.

2. The method according to claim 1, characterized in that, The method further includes: Obtain the current heating exit temperature of the power battery pack; Accordingly, after heating the power battery pack, the process further includes: The current body temperature of the power battery pack is re-acquired, and it is determined whether the new current body temperature exceeds the current heating exit temperature. If so, the heating of the power battery pack is canceled.

3. The method according to claim 2, characterized in that, The step of obtaining the current heating exit temperature of the power battery pack includes: In the first data, the heating entry temperature that is closest to the current body temperature under the current remaining power is determined to obtain the current heating entry temperature. The first data is also used to represent at least one heating entry temperature under each remaining power, and the heating exit temperature corresponding to each heating entry temperature. In the first data, the heating exit temperature corresponding to the current heating entry temperature is queried to obtain the current heating exit temperature.

4. The method according to claim 1, characterized in that, After heating the power battery pack, the method further includes: When the vehicle is currently in a driving state, during the heating process of the power battery pack, it is determined whether the vehicle has a passenger compartment heating request. If so, the current body temperature of the power battery pack is re-acquired. If the new current body temperature is lower than the preset first temperature threshold, the passenger compartment of the vehicle is heated. If the new current body temperature is not lower than the preset first temperature threshold, the heating of the power battery pack is stopped. After the passenger compartment is heated to the preset temperature, the heating of the power battery pack is resumed.

5. The method according to claim 1, characterized in that, The preset data includes second data, and determining the current heating threshold of the power battery pack based on the preset data includes: If the vehicle is currently in a charging state, the current heating threshold is determined based on the charging mode of the power battery pack and the second data. The second data is used to represent the correspondence between each charging mode and each heating entry temperature threshold.

6. The method according to claim 1, characterized in that, After heating the power battery pack, the method further includes: If the vehicle is currently in a charging state, during the heating process of the power battery pack, it is determined whether the vehicle has a passenger compartment heating request. If so, then the passenger compartment of the vehicle is heated.

7. The method according to claim 6, characterized in that, Prior to heating the passenger compartment of the vehicle, the following is also included: Reacquire the current body temperature of the power battery pack and determine whether the new current body temperature is lower than the preset limit temperature corresponding to the charging mode of the power battery pack. If so, then the step of heating the passenger compartment of the vehicle is performed.

8. The method according to claim 1, characterized in that, Heating the power battery pack includes: Turn on the heat source and adjust the control valve in the power battery pack circuit to the open state of the power battery pack's heating circuit, so that the heat provided by the heat source is transferred to the liquid cooling plate of the power battery pack through the heating circuit, wherein the liquid cooling plate is used to conduct heat to the power battery pack; or, Turn on the compressor in the air conditioning heat pump system and connect the air conditioning heat pump system to the power battery pack circuit so that the air conditioning heat pump system provides heat and transfers the provided heat to the power battery pack.

9. A vehicle, characterized in that, The vehicles include: Memory, used to store executable program code; A processor for calling and running the executable program code from the memory, causing the vehicle to perform the method as described in any one of claims 1 to 8.

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