Power battery self-heating method, system, automobile and computer readable storage medium

Abstract

The present application belongs to the technical field of hybrid cars and power batteries, in particular to a power battery self-heating method, system, car and computer readable storage medium. The power battery self-heating method comprises the following steps: responding to a heating request; obtaining vehicle state information, matching corresponding self-heating mode information according to the vehicle state information, the vehicle state information including gear information, engine working information and vehicle fault information, and the self-heating mode information including idling self-heating mode information and driving self-heating mode information; and executing a response according to the self-heating mode information, and controlling the power battery to repeatedly charge and discharge to realize self-heating of the power battery. Therefore, the present application can rely on the existing system architecture of the hybrid car, control the power battery to repeatedly charge and discharge within a preset power range to realize self-heating of the power battery. The cost of the vehicle is reduced, better heating uniformity is realized, and the user experience is improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of hybrid cars and power batteries, and particularly relates to a power battery self-heating method, a power battery self-heating system, a hybrid car and a computer readable storage medium. BACKGROUND

[0002] In daily life, the number of new energy vehicles is increasing year by year, and hybrid cars, which combine the advantages of fuel cars and electric cars, have become the choice of more people. The oil-electric hybrid car relies on the engine and the power battery to realize the power demand of the whole vehicle, and the most widely used power battery is the lithium battery. However, the power of the lithium ion power battery is limited at low temperature, and long-term use at low temperature has an impact on the service life and safety, so the power battery needs to be heated at low temperature.

[0003] Therefore, the power battery heating scheme of the hybrid car needs to be coupled with the cooling scheme. The current prior art includes a high-voltage heating film / PTC scheme and a liquid heating scheme. The high-voltage heating scheme is prone to dry burning and leads to thermal runaway due to aging and other reasons, and the safety and reliability are relatively low. The liquid heating scheme is too high in cost, and the cost performance is low for the use of small capacity batteries (compared with pure electric power batteries). The prior art also has the following defects: for the technical scheme of realizing power battery self-heating by pulse charging and discharging, it is difficult to realize the pulse working condition of the whole vehicle, especially during driving, the pulse working condition required by the whole vehicle demand and the battery self-heating cannot be considered at the same time. For the second power battery cooperating to realize self-heating, the second power battery needs to be added to the whole vehicle, which increases the complexity of the hardware architecture and the cost, and has limitations in actual application.

[0004] In view of the above problems, the technical personnel in the field have been seeking solutions.

[0005] The foregoing description is to provide general background information and does not necessarily constitute the prior art. SUMMARY

[0006] The technical problem solved by the application is to provide a power battery self-heating method, a power battery self-heating system, a hybrid car and a computer readable storage medium, which can realize the self-heating of the power battery by repeatedly charging and discharging the power battery within a preset power range without adding new hardware architecture, relying on the existing system architecture of the hybrid car. Therefore, the heating film and other hardware can be cancelled, the vehicle economy is optimized, and the vehicle cost is reduced; and better heating uniformity is realized through self-heating, and the user experience is improved.

[0007] The application solves the technical problem by adopting the following technical scheme:

[0008] The application provides a power battery self-heating method, comprising the following steps: responding to a heating request; obtaining vehicle state information, matching corresponding self-heating mode information according to the vehicle state information, wherein the vehicle state information comprises gear information, engine working information and vehicle fault information, and the self-heating mode information comprises idling self-heating mode information and driving self-heating mode information; and executing response according to the self-heating mode information, and controlling the power battery to repeatedly charge and discharge to realize power battery self-heating.

[0009] Further, before the step of responding to the heating request, the method comprises: obtaining battery temperature information of the power battery, generating the heating request when the battery temperature information is lower than a first temperature threshold; and / or generating and / or stopping generating the heating request according to user operation.

[0010] Further, in the step of obtaining vehicle state information and matching corresponding self-heating mode information according to the vehicle state information, the method comprises: matching the idling self-heating mode information when the gear information corresponds to P / N gear; and matching the driving self-heating mode information when the gear information corresponds to D gear.

[0011] Further, in the step of executing response according to the self-heating mode information when the self-heating mode information comprises the idling self-heating mode information, the method comprises: executing idling self-heating control according to the idling self-heating mode information when the vehicle state information meets idling self-heating conditions, wherein the idling self-heating control comprises: controlling the generator to counter-drag the engine to maintain the idling speed of the engine and control the fuel injection amount of the engine during the discharging process of the power battery; adjusting the charging and discharging power of the power battery in real time according to the low-temperature charging and discharging capacity of the power battery and the power required for counter-dragging the engine; controlling the water temperature of the engine to be above a second temperature threshold if heating / defrosting demand information is obtained; and stopping generating the heating request when the battery temperature information is higher than a third temperature threshold.

[0012] Further, the idling self-heating conditions comprise: maintaining the gear state for more than a first time threshold; the vehicle fault information corresponds to a fault-free state; the engine working information corresponds to a normal working state of the engine; and the water temperature is higher than a fourth temperature threshold if the heating / defrosting demand information is obtained.

[0013] Further, in the step of executing response according to the self-heating mode information, the method comprises: exiting the idling self-heating control to stop the self-heating of the battery when idling self-heating exit conditions are met, wherein the idling self-heating exit conditions comprise: the battery temperature information is higher than the third temperature threshold; or, the heating request is not obtained; or, the gear information does not correspond to the P / N gear state; or, the water temperature is lower than the second temperature threshold and the maintaining time is more than the second time threshold if there is heating / defrosting demand; or, any one of the vehicle fault information corresponds to a situation that cannot meet the self-heating.

[0014] Further, in the step of executing response according to the self-heating mode information, when the vehicle state information meets the driving self-heating condition, the driving self-heating control is executed according to the driving self-heating mode information, the driving self-heating condition includes that the vehicle fault information corresponds to a fault-free state, and the driving self-heating control includes that the charging and discharging power is adjusted in real time according to the low-temperature charging and discharging capability of the battery and the vehicle demand power, and when the battery temperature information is higher than the third temperature threshold, the generation of the heating request is stopped.

[0015] Further, in the step of executing response according to the self-heating mode information, when the vehicle state information meets the driving self-heating condition, the driving self-heating control is executed according to the driving self-heating mode information, the driving self-heating condition includes that the vehicle fault information corresponds to a fault-free state, and the driving self-heating control includes that the charging and discharging power is adjusted in real time according to the low-temperature charging and discharging capability of the battery and the vehicle demand power, and when the battery temperature information is higher than the third temperature threshold, the generation of the heating request is stopped.

[0016] Further, in the step of controlling the repeated charging and discharging of the battery, the power information of the battery is obtained, and it is determined whether the initial power information is lower than the upper power threshold, if yes, the engine is started to charge the battery until the power information is higher than the upper power threshold, and if no, the battery is controlled to discharge until the power information is lower than the lower power threshold, when the power information is lower than the lower power threshold, the battery is controlled to charge, and when the power information is higher than the upper power threshold, the battery is controlled to discharge, so as to control the battery to repeatedly perform charging and discharging within the range of the lower power threshold and the upper power threshold.

[0017] The application further provides a power battery self-heating system, which comprises a power battery controller, a vehicle controller and an engine controller.

[0018] The application further provides a hybrid electric vehicle comprising the power battery self-heating system.

[0019] The application further provides a computer readable storage medium, which stores a computer program, and when the computer program is executed by a processor, the steps of the power battery self-heating method are implemented.

[0020] The application further provides a power battery self-heating method, a power battery self-heating system, a hybrid vehicle and a computer readable storage medium. The power battery self-heating method comprises the following steps: responding to a heating request; obtaining vehicle state information, and matching corresponding self-heating mode information according to the vehicle state information, wherein the vehicle state information comprises gear information, engine working information and vehicle fault information, and the self-heating mode information comprises an idling self-heating mode information and a driving self-heating mode information; and performing a response according to the self-heating mode information to realize power battery self-heating. Therefore, the application can control the power battery to repeatedly charge and discharge within a preset power range to realize power battery self-heating without adding new hardware architecture, but only relying on the existing system architecture of the hybrid vehicle. The vehicle cost is reduced, better heating uniformity is realized, and the user experience is improved. In addition, the control method of the vehicle provided by an embodiment of the application can further enter different self-heating modes in different states of the vehicle to realize adjustable and controllable self-heating rates. The operability of the self-heating mode is increased by identifying the heating request as a trigger condition and identifying the corresponding low-temperature condition or manually triggering. In addition, the adaptability of the charging and discharging power is adjusted by considering the required power of the vehicle and the charging and discharging capacity of the battery under low-temperature conditions during the repeated charging and discharging process, thereby reducing the impact of repeated charging and discharging on the service life of the power battery. In the idling self-heating mode, the heating and defrosting requirements of the vehicle are considered, and the water temperature is maintained at a certain temperature to enter or exit the self-heating mode. In addition, the engine working state and the vehicle fault information are obtained at all times when the battery charging and discharging switches, so as to prevent the engine working condition from fluctuating sharply and avoid NVH problems. Therefore, the application can utilize the characteristics of increased low-temperature battery internal resistance, realize the repeated charging and discharging of the battery within a preset power range on the basis of safety and without affecting the service life of the battery, combine the power demand of the vehicle, realize uniform temperature rise of the battery, reduce hardware cost, reduce temperature difference during the heating process, thereby reducing irreversible damage of the battery caused by temperature difference, reducing user operation, increasing user convenience and improving user experience.

[0021] The above description is only a summary of the technical scheme of the application. In order to more clearly understand the technical means of the application, the content of the specification can be implemented, and in order to make the above and other purposes, characteristics and advantages of the application more obvious and easy to understand, the following preferred embodiments are described in detail, and the accompanying drawings are described in detail. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to make the objects, technical solutions and advantages of the present application clearer, the following further describes the present application with reference to the accompanying drawings and embodiments. It should be understood that the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort belong to the scope of protection of the present application.

[0023] Figure 1 A flowchart of a power battery self-heating method provided by the first embodiment of the present application is shown in FIG. 1.

[0024] Figure 2 A timing flowchart of components in an idle self-heating mode of the power battery self-heating method provided by the second embodiment of the present application is shown in FIG. 4.

[0025] Figure 3 A timing flowchart of components in a driving self-heating mode of the power battery self-heating method provided by the second embodiment of the present application is shown in FIG. 5.

[0026] Figure 4 A structure diagram of a power battery self-heating system provided by the third embodiment of the present application is shown in FIG. 8.

[0027] Figure 5 A structure diagram of a vehicle controller provided by the third embodiment of the present application is shown in FIG. 9. DETAILED DESCRIPTION

[0028] In order to make the objects, technical solutions and advantages of the present application clearer, the following further describes the present application with reference to the accompanying drawings and embodiments. It should be understood that the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort belong to the scope of protection of the present application.

[0029] The following further describes the embodiments of the present application with reference to the accompanying drawings.

[0030] First Embodiment

[0031] Figure 1 A flowchart of the power battery self-heating method of the first embodiment of the present application is shown in FIG. 1. In order to clearly describe the power battery self-heating method provided by the first embodiment of the present application, please refer to Figure 1 .

[0032] The power battery self-heating method of the first embodiment of the application is applied to a hybrid electric vehicle. It can be understood that in the field of new energy vehicles, the most widely used power battery is a lithium ion battery. A significant characteristic of the lithium ion battery is that the change in temperature greatly affects the working efficiency of the lithium ion battery. In particular, at low temperatures, the internal resistance will significantly increase, and the energy that can be released by the lithium ion battery will significantly decrease. Therefore, when in a low-temperature environment, the battery temperature must be increased by a heating method to optimize the performance of the lithium battery and improve the service life and safety of the lithium ion battery. A hybrid electric vehicle has an engine and a power battery to meet the power requirements of the vehicle. The two can complement each other to meet the shortcomings. Therefore, under the existing system architecture of the hybrid electric vehicle, the self-heating of the power battery can be realized by the control strategy of the vehicle. Specifically, the internal resistance of the power battery at low temperatures is very large, which is more than ten times higher than that at normal temperatures. Therefore, a large amount of self-heating will be generated during the charging and discharging of the battery. In addition, the capacity of the power battery of the hybrid electric vehicle is limited. The power battery can be repeatedly charged and discharged to heat the battery. Specifically, the power battery self-heating method includes the following steps:

[0033] Step S1: responding to a heating request.

[0034] In an embodiment, before the step S1: responding to a heating request, it includes: obtaining battery temperature information of the power battery, generating a heating request when the battery temperature information is lower than a first temperature threshold; and / or generating and / or stopping generating a heating request according to a user operation.

[0035] In an embodiment, for the triggering of the self-heating of the power battery, it is preferred to rely on whether a heating request is received. The generation of the heating request includes two ways, automatic and / or manual generation. Specifically, for the automatic generation, it can include but is not limited to that by collecting the battery temperature information of the power battery, it is determined whether the battery temperature information is lower than a first temperature threshold, wherein the first temperature threshold is preferably -5°C. When the battery temperature information is lower than the first temperature threshold, the corresponding heating request is automatically generated. Further, for the battery temperature information, it can also include the ambient temperature information, for example, in the case of low ambient temperature, it can also be determined according to the result of whether it is lower than the lower threshold of the ambient temperature to decide whether to generate the heating request. In another embodiment, for the manual generation of the heating request, that is, the active triggering according to the user operation to generate and / or stop generating the heating request. The specific embodiment can include but is not limited to that a button, knob, switch or touch device, such as an in-vehicle touch display, etc., is installed in the vehicle to trigger the generation and / or stop generating the heating request. Further, it can also be other intelligent terminals, such as mobile terminals, etc., which are in communication connection with the hybrid vehicle, to achieve the generation and / or stop generating the heating request by remote triggering to achieve the control of the implementation and / or stop of the self-heating of the power battery.

[0036] In an embodiment, after receiving the heating request, the self-heating mode of the power battery is triggered to enter to perform the subsequent steps to mobilize the vehicle to implement the self-heating of the power battery.

[0037] Step S2: Obtain vehicle state information, match the corresponding self-heating mode information according to the vehicle state information, the vehicle state information includes gear information, engine working information, vehicle fault information, and the self-heating mode information includes idle speed self-heating mode information and driving self-heating mode information.

[0038] In an embodiment, the vehicle obtains the vehicle state information mainly for two purposes, one is to determine whether the current state of the vehicle can enter the implementation of the self-heating of the power battery, and the other is to determine which self-heating mode to enter. For the first purpose, the vehicle state information includes at least one of the engine working information and the vehicle fault information. The engine working information can be collected by the engine controller and sent to the vehicle controller by the CAN bus, which can include the working condition information, starting information, demand power information, fuel injection amount, etc. of the engine. For the vehicle fault information, it is determined whether the hybrid vehicle currently has a vehicle fault, and whether the vehicle fault will affect the execution of the steps of the self-heating of the power battery.

[0039] In an embodiment, the gear information is included in the vehicle state information for judging into which self-heating mode according to the second purpose described above. It can be understood that the working state of the vehicle is greatly different at different gears, and thus the self-heating of the power battery is different, and thus needs to be distinguished to enter different power battery self-heating modes, to realize different self-heating entering conditions, execution steps, and exiting conditions.

[0040] In an embodiment, in the step S2 of acquiring the vehicle state information and matching the corresponding self-heating mode information according to the vehicle state information, when the gear information corresponds to P / N gear, the idle self-heating mode information is matched; and when the gear information corresponds to D, the driving self-heating mode information is matched.

[0041] In an embodiment, the self-heating mode is divided into idle self-heating and driving self-heating according to the gear information of the vehicle, which corresponds to P / N gear and D gear. In the idle self-heating mode, the repeated charging and discharging of the power battery is realized by the energy conversion between the generator and the engine. Specifically, when the power battery is charged, the charging of the power battery is realized by the engine driving the generator; and when the power battery is discharged, the discharge is realized by the generator driving the engine to maintain the idle speed of the engine. In the driving self-heating mode, the battery is repeatedly charged and discharged in the set power range and power range based on the energy management strategy of the vehicle, to realize the heating of the battery. Specifically, it can be seen that there are differences in the execution of the two, and there are differences in the entering conditions, execution constraints, and exiting conditions, which will be described in detail later.

[0042] Step S3: executing response according to the self-heating mode information, to control the repeated charging and discharging of the power battery to realize the self-heating of the power battery.

[0043] In an embodiment, when the self-heating mode information includes the idle self-heating mode information, in the step S3 of executing response according to the self-heating mode information, when the vehicle state information meets the entering condition of the idle self-heating, the idle self-heating control is executed according to the idle self-heating mode information, which includes: in the discharging process of the power battery, the generator is controlled to drive the engine to maintain the idle speed of the engine, and the fuel injection amount of the engine is controlled; the charging and discharging power of the power battery is adjusted in real time according to the low-temperature charging and discharging capability of the power battery and the required power of the engine; if the heating / defrosting demand information is acquired, the water temperature of the engine is controlled to be above the second temperature threshold; and when the battery temperature information is higher than the third temperature threshold, the heating request is stopped.

[0044] In an embodiment, the idle self-heating condition comprises: the gear state is kept for more than a first time threshold; the vehicle fault information corresponds to a no fault state; the engine working information corresponds to a normal working state of the engine; and the water temperature is higher than a fourth temperature threshold if the heating / defrosting demand information is obtained.

[0045] In an embodiment, in the step S3 of executing a response according to the self-heating mode information, the step comprises: when the idle self-heating exit condition is met, the idle self-heating control is exited to stop the self-heating of the battery, the idle self-heating exit condition comprises: the battery temperature information is higher than a third temperature threshold; or, the heating request is not obtained; or, the gear information does not correspond to the P / N gear state; or, if there is a heating / defrosting demand, the water temperature is lower than a second temperature threshold and the keeping time is more than a second time threshold; or, any one of the vehicle fault information corresponds to a situation that the self-heating cannot be met.

[0046] In an embodiment, for the case of idle self-heating, the charging and discharging of the battery is achieved by energy conversion between the generator and the engine. Specifically, for the case of idle self-heating mode, all the following conditions need to be met to enter the idle self-heating mode: (1) the battery temperature information is lower than the first temperature threshold, wherein the first temperature threshold is preferably -5°C, and there is no related fault for the collection of battery temperature information, for example, the temperature sensor for collecting the battery temperature information is in working condition; (2) the vehicle is in ready and the gear information corresponds to P / N gear state; (3) for the previous state of D / R gear, a delay of more than the first time threshold is required, or the P / N gear is maintained for more than the first time threshold, and the specific duration of the first time threshold can be preferably 2s, that is, the condition is met after the gear is maintained for more than 2s and / or switched to P / N gear for more than 2s. The setting of this condition is to prevent false start into idle self-heating mode, by setting a delay, to determine that the hybrid vehicle is indeed and will be in P / N gear state for a long time in order to perform idle self-heating; (4) the vehicle satisfies the engine start condition, that is, the engine working information corresponds to the working condition that satisfies the execution condition, and the engine is in normal working state; (5) the vehicle controller obtains the vehicle fault information corresponding to the fault-free state, or it can also be judged that the fault state will not hinder the execution of the idle self-heating mode; (6) if the engine water temperature with heating / defrosting demand is obtained, the temperature needs to be higher than the fourth temperature threshold, and if there is no heating / defrosting demand, the water temperature condition does not need to be considered, wherein the fourth temperature threshold is preferably 80°C. It can be understood that because the heating / defrosting demand is specifically achieved by transferring the engine water temperature through the vehicle air conditioner, therefore the high and low of the water temperature actually reflects the working condition of the engine to some extent, and the implementation of idle self-heating needs the participation of the engine, therefore in order to maintain the temperature of the heater core water above a certain temperature, it is necessary to adjust the charging and discharging power window according to the ambient temperature, that is, the influence of the water temperature needs to be considered. At the same time, the vehicle fault information and the engine working information are used as the entry condition for judgment, which is not only set to realize the self-heating of the power battery with the cooperation of the engine, but also to avoid the NVH problem caused by the fluctuation of engine working condition during the switching process of battery charging and discharging.

[0047] In an embodiment, after all the idle self-heating conditions are met, then enter the step of performing idle self-heating control. Among them, the control of idle self-heating includes: repeatedly charging and discharging the power battery within a certain power range, and the specific implementation of repeated charging and discharging is the same as the implementation steps of the driving self-heating mode, which will be described after the specific implementation steps of the driving self-heating mode are described. Further, the control of idle self-heating also includes: controlling the generator to counter-drag the engine to maintain the idle speed of the engine during the discharging process of the power battery, wherein the engine should stop injecting fuel and / or adjust the fuel injection amount so that the power battery can be fully discharged. According to the battery low-temperature charging and discharging capacity of the power battery and the charging power required by the counter-dragging engine, the charging power of the power battery is adjusted in real time. Specifically, that is to say, during the discharging process, the battery discharges mainly for the purpose of counter-dragging the engine by the generator, and this discharging does not have a power upper limit. The smaller one between the battery low-temperature discharging capacity and the power required by the counter-dragging engine is taken as the actual discharging efficiency of the power battery of the idle self-heating. Similarly, during the charging process, the charging is achieved by the generator driven by the engine to supplement the power of the power battery. The charging power required by the power battery here also does not have an upper limit. The smaller one between the charging capacity power of the power battery under low temperature and the self-heating power calibration value is taken to charge the battery with appropriate charging power. By adjusting the charging and discharging power of the power battery in real time, the charging and discharging power is limited to increase the service life and safety of the battery. Further, different car owners have different use conditions and light absorption of the vehicle, such as short-distance driving or users with lower power requirements, which need to adaptively reduce the self-heating power. This function is adaptively self-learned and calibrated through big data algorithms, that is, the charging and discharging power is adaptively adjusted to meet the different needs of different users and optimize the economy of the vehicle. Further, if the heating / defrosting demand is obtained, the engine water temperature information needs to be controlled to be above the second temperature threshold, and the second temperature threshold is preferably 75°C. And the battery temperature of the power battery is detected in real time, and when the battery temperature information is higher than the third temperature threshold, the heating request is stopped. By using the characteristics of the increased internal resistance of the low-temperature battery, the repeated charging and discharging of the battery within the preset power range is realized on the basis of safety and without affecting the service life of the battery, and finally the uniform temperature rise of the battery is realized.

[0048] In an embodiment, in the step S3 of executing response according to the self-heating mode information, the step of executing response according to the self-heating mode information comprises: when the idle self-heating exit condition is met, exiting the idle self-heating control to stop the self-heating of the battery, the idle self-heating exit condition comprising any one of: the battery temperature information being higher than a third temperature threshold; or, no heating request being obtained; or, the gear information not corresponding to the P / N gear state; or, when there is a heating / defrosting demand, the water temperature being lower than a second temperature threshold and the holding time being longer than a second time threshold; or, there being vehicle fault information corresponding to a situation in which the self-heating cannot be met.

[0049] In an embodiment, for the exit condition of the idle self-heating mode, only any one of the conditions needs to be met, and the idle self-heating control is exited to stop the self-heating of the battery. Specifically, the idle self-heating exit condition comprises: (1) the battery temperature information being higher than a third temperature threshold, wherein the third temperature threshold is preferably -3℃; (2) no heating request being obtained, which corresponds to the user stopping the generation of the heating request according to the manual operation, i.e., the user actively stops the idle self-heating control before the self-heating is completed; (3) the gear information not corresponding to the P / N gear state, as described above, different gears correspond to different vehicle states, and the specific implementation steps in the process of realizing the self-heating are inconsistent, so when the gear does not meet the preset condition, the idle self-heating control is exited; (4) when there is a heating / defrosting demand, the water temperature being lower than a second temperature threshold and the holding time being longer than a second time threshold, wherein the second time threshold is preferably 60s and the second temperature threshold is preferably 75℃, i.e., when the water temperature is lower than 75℃ for more than 60s, it is determined that the idle self-heating is not easy to be performed, and the idle self-heating control is exited; (5) there being vehicle fault information corresponding to a situation in which the self-heating cannot be met, i.e., any one of the engine operation information and / or the vehicle fault information being faulty and / or being faulty and hindering the execution of the idle self-heating control, and the idle self-heating is exited. As long as any one of the conditions is met, the idle self-heating control is exited.

[0050] In an embodiment, in the step S3 of executing response according to the self-heating mode information, when the self-heating mode information comprises the driving self-heating mode information, the step of executing response according to the self-heating mode information comprises: when the vehicle state information meets the driving self-heating condition, executing the driving self-heating control according to the driving self-heating mode information, the driving self-heating condition comprising the vehicle fault information corresponding to the no-fault state, and the driving self-heating control comprising: adjusting the charging / discharging power in real time according to the low-temperature charging / discharging capability of the battery and the vehicle demand power; and stopping the generation of the heating request when the battery temperature information is higher than a third temperature threshold.

[0051] In an embodiment, for the driving self-heating mode, based on the vehicle energy management strategy, the power battery is repeatedly charged and discharged within the set power range to achieve self-heating of the power battery. The driving self-heating mode does not need to consider too many things like the idle self-heating mode, so the entry condition, execution constraint condition and exit condition are relatively simple.

[0052] In an embodiment, the entry condition required for the driving self-heating mode includes: (1) the battery temperature information is lower than the first temperature threshold, wherein the first temperature threshold is preferably -5℃, and there is no related fault for the collection of the battery temperature information, for example, the temperature sensor for collecting the battery temperature information is in working condition; (2) the vehicle is in ready and the gear information corresponds to the D gear state; (3) the vehicle controller obtains the vehicle fault information corresponding to the fault-free state, or it can also be judged that the fault state will not hinder the execution of the idle self-heating mode, and the engine working information corresponds to the working condition satisfying the execution condition, and the engine is in normal working state. After all the above conditions are met, the driving self-heating mode can be controlled to enter.

[0053] In an embodiment, the constraint condition for executing the driving self-heating control mainly refers to real-time adjustment of the charging and discharging power according to the low-temperature charging and discharging capacity of the power battery and the vehicle demand power. Specifically, when the power battery is charging, the charging power of the power battery is smaller between the charging capacity of the power battery under low-temperature condition and the self-heating power calibration value; when discharging, the discharging power is smaller between the discharging capacity of the power battery under low-temperature condition and the vehicle power demand. The method of real-time adjustment of the charging and discharging power of the power battery in the driving self-heating mode is similar to that in the idle self-heating mode, and the main difference is only in the execution in the discharging state, and in fact it is also considered to take the smaller one between the actual demand power and the charging and discharging power limit for adjustment.

[0054] In an embodiment, in the step S3 of executing the response according to the self-heating mode information, it includes: when the driving self-heating exit condition is met, the driving self-heating control is exited to stop the self-heating of the battery, and the driving self-heating exit condition includes: the battery temperature information is higher than the third temperature threshold; or, the heating request is not obtained; or, the gear information does not correspond to the D gear state; or, there is any one of the vehicle fault information corresponding to the self-heating condition that cannot be met.

[0055] In an embodiment, the exit conditions for the driving self-heating are similar to the idle self-heating exit conditions, but are simpler, and the driving self-heating control is exited and the power battery self-heating is stopped as long as any of the exit conditions is met. Specifically, the driving self-heating exit conditions include: (1) the battery temperature information is higher than a third temperature threshold, and the third temperature threshold is preferably -3°C; (2) a heating request is not obtained, and the heating request not being obtained corresponds to the aforementioned description that the user can stop generating the heating request according to the manual operation, that is, the user actively stops the idle self-heating control before the self-heating is completed, in addition to the battery temperature information being higher than the third temperature threshold to stop generating the heating request; (3) the gear information does not correspond to the D gear state; (4) there is vehicle fault information corresponding to the situation that the self-heating cannot be met, that is, any of the engine operation information and / or the vehicle fault information is faulty and / or the fault occurs and hinders the execution of the idle self-heating control, and the idle self-heating is also exited. Preferably, if any of the above exit conditions is met, the driving self-heating mode can be controlled to be exited, and the repeated charging and discharging of the power battery is stopped.

[0056] In an embodiment, in the step S3 of controlling the battery to repeatedly charge and discharge, the step includes: obtaining the power battery power information; determining whether the initial power information is lower than the upper power threshold; if yes, starting the engine to charge the battery until the power information is higher than the upper power threshold; if no, controlling the battery to discharge until the power information is lower than the lower power threshold; when the power information is lower than the lower power threshold, controlling the battery to charge, and when the power information is higher than the upper power threshold, controlling the battery to discharge, so as to control the battery to repeatedly charge and discharge within the range of the lower power threshold and the upper power threshold.

[0057] In an embodiment, the power battery self-heating method provided by the present application mainly controls the power battery to perform repeated charging and discharging within a preset range, so as to realize the temperature rise of the battery. For the specific embodiment of repeated charging and discharging, the power battery can be first acquired, and according to the initial power information of the power battery, if it is higher than or equal to the upper limit threshold of the power, the power battery is directly controlled to perform discharging until the battery power is lower than the lower limit threshold of the power; if it is lower than or equal to the lower limit threshold of the power, the engine is directly controlled to start to drive the generator to charge the power battery until the power of the power battery is higher than the upper limit threshold of the power, wherein the upper limit threshold of the power is preferably 70%, and the lower limit threshold of the power is preferably 40%. After the charging and discharging according to the initial power, the power battery is controlled to perform repeated charging and discharging within the upper limit threshold and the lower limit threshold of the power. That is to say, after the initial charging and discharging step is completed, when the power information is lower than the lower limit threshold of the power, the battery is controlled to be charged, and when the power information is higher than the upper limit threshold of the power, the battery is controlled to be discharged. Preferably, before the battery power exits the condition corresponding to each mode, the charging and discharging of the power battery is preferably only charging or only discharging the battery in one execution step, except for the necessary battery discharge requirement. Therefore, by relying on the characteristics of the increased internal resistance of the low-temperature battery, the power battery is repeatedly charged and discharged within the preset upper and lower limits of the battery power on the basis of safety and without affecting the service life of the battery, combined with the power demand of the vehicle, so as to realize the uniform temperature rise of the battery.

[0058] The power battery self-heating method provided by the first embodiment of the present application is applied to a hybrid electric vehicle and comprises the following steps: step S1: responding to a heating request; step S2: obtaining vehicle state information, matching corresponding self-heating mode information according to the vehicle state information, wherein the vehicle state information comprises gear information, engine working information and vehicle fault information, and the self-heating mode information comprises idling self-heating mode information and driving self-heating mode information; and step S3: executing a response according to the self-heating mode information, and controlling the power battery to repeatedly charge and discharge to realize self-heating of the power battery. Therefore, the present application can realize self-heating of the power battery by controlling the power battery to repeatedly charge and discharge within a preset power range without increasing new hardware architecture, only relying on the existing system architecture of the hybrid electric vehicle. The vehicle cost is reduced, better heating uniformity is realized, and the user experience is improved. In addition, the control method of the vehicle provided by the embodiment of the present application can further enter different self-heating modes according to different states of the vehicle, so as to realize adjustable and controllable self-heating rate. The operability of the self-heating mode is increased by taking the identification of the heating request as a trigger condition and identifying or manually triggering the corresponding low-temperature condition. In addition, the adaptability of the charging and discharging power is adjusted by considering the required power of the vehicle and the charging and discharging capacity of the battery under low-temperature conditions during the repeated charging and discharging process, so as to reduce the influence of the repeated charging and discharging on the service life of the power battery. In the idling self-heating mode, the heating and defrosting requirements of the vehicle are considered, so the water temperature is maintained at a certain temperature, and therefore the self-heating mode is entered or exited according to the water temperature. In addition, the engine working state and the vehicle fault information are obtained at all times when the battery charging and discharging is switched, so as to prevent the engine working condition from fluctuating sharply and avoid NVH problems. Therefore, the present application can utilize the characteristics of increased internal resistance of the low-temperature battery, realize repeated charging and discharging of the battery within a preset power range on the basis of safety and without affecting the service life of the battery, combine the power demand of the vehicle, realize uniform temperature rise of the battery, reduce hardware cost, reduce temperature difference during the heating process, thereby reducing irreversible damage of the battery caused by temperature difference, and also reducing the operation of the user, increasing the convenience of the user, and improving the user experience.

[0059] Second embodiment

[0060] Figure 2 The timing sequence flowchart of each component in the idling self-heating mode of the power battery self-heating method provided by the second embodiment of the present application is shown in the figure; Figure 3 The timing sequence flowchart of each component in the driving self-heating mode of the power battery self-heating method provided by the second embodiment of the present application is shown in the figure. In order to clearly describe the power battery self-heating method provided by the second embodiment of the present application, please refer to Figure 1 、 Figure 2 and Figure 3 .

[0061] In an embodiment, the power battery self-heating method provided by the second embodiment of the present application is mainly a detailed description of how to coordinate various components for the idle self-heating mode and the driving self-heating mode. Referring to Figure 2 and Figure 3 It can be seen that the required execution subjects at least include the power battery controller 110, the vehicle controller 120 and the engine controller 130, and in addition, the gear controller and the generator controller, and the air conditioner controller for detecting the heating / defrosting demand in the idle self-heating mode. It can be understood that since the gear controller and the like are not the most critical components, they are not listed in the way, but are only used as effective information provided by the vehicle controller 120 for analysis and judgment, so in the Figure 2 , Figure 3 provided by the present embodiment, which will be described in detail in the subsequent description.

[0062] In an embodiment, the power battery self-heating method provided by the second embodiment of the present application is mainly a detailed description of how to coordinate various components for the idle self-heating mode and the driving self-heating mode. Referring to Figure 2 , the flow of the idle self-heating mode includes the following steps:

[0063] Step S211: The power battery controller 110 acquires the battery temperature information of the power battery, and judges whether the battery temperature information is lower than the first temperature threshold.

[0064] Step S212: When the power battery controller 110 judges that the answer is yes, it sends a heating request to the vehicle controller 120.

[0065] Step S213: The engine controller 130 acquires the engine working information and sends it to the vehicle controller 120.

[0066] Step S214: The vehicle controller 120 acquires the gear information, the vehicle fault information, and the water temperature information of the engine if the heating / defrosting demand information is acquired.

[0067] Step S215: When the idle self-heating condition is met, the vehicle controller 120 generates idle self-heating mode information.

[0068] In an embodiment, steps S212-S215, i.e., after the heating request is obtained, the whole vehicle controller 120 collects the entry conditions, including gear information, whole vehicle fault information, engine working information, water temperature information, etc. Specifically, the engine working information can be collected by the engine controller 130 and sent to the whole vehicle controller 120 through the CAN bus, which can include engine working condition information, starting information, required power information, fuel injection amount, etc. For the whole vehicle fault information, it is determined whether the hybrid vehicle currently has a vehicle fault and whether the vehicle fault will affect the execution of the power battery self-heating step. The gear information can include gear state information and delay information, which will be described in detail in the subsequent conditions.

[0069] In an embodiment, the idle self-heating condition includes: (1) the battery temperature information is lower than a first temperature threshold, wherein the first temperature threshold is preferably -5°C, and there is no related fault for collecting the battery temperature information, for example, the temperature sensor for collecting the battery temperature information is in working state; (2) the whole vehicle is in ready and the gear information corresponds to P / N gear state; (3) for the previous state of D / R gear, a delay of more than a first time threshold is required, or P / N gear is maintained for more than a first time threshold, and the specific duration of the first time threshold can be preferably 2s, i.e., the condition is satisfied after the gear is maintained for more than 2s and / or switched to P / N gear for more than 2s; (4) the whole vehicle satisfies the engine starting condition, i.e., the engine working information corresponds to a working condition that satisfies the execution condition, and the engine is in normal working state; (5) the whole vehicle controller 120 obtains the whole vehicle fault information corresponding to the fault-free state, or it is determined that the fault state will not hinder the execution of the idle self-heating mode; (6) if the engine water temperature for obtaining the heating / defrosting demand needs to be higher than a fourth temperature threshold, and if there is no heating / defrosting demand, the water temperature condition does not need to be considered, wherein the fourth temperature threshold is preferably 80°C. All the above conditions need to be satisfied, and then the idle self-heating control can be entered. Specifically, it has been described in detail in the first embodiment of the present application, and reference can be made to the foregoing, which will not be described here in detail.

[0070] Step S216: according to the idle self-heating mode information, the idle self-heating control is executed, and the whole vehicle controller 120 controls the power battery controller 110 and the engine controller 130 to cooperate with each other to realize the repeated charging and discharging of the power battery to realize the self-heating of the power battery.

[0071] In an embodiment, the control of the self-heating at idle speed includes: repeatedly charging and discharging the power battery within a certain power range; during the discharging of the power battery, controlling the generator to reverse-drag the engine to maintain the idle speed of the engine, wherein the engine should stop fuel injection and / or adjust the fuel injection amount so that the power battery can be fully discharged; real-time adjusting the charging power of the power battery according to the low-temperature charging and discharging capability of the power battery and the power required for the reverse-dragging of the engine; adaptively adjusting the charging and discharging power according to the user demand; and further, if the heating / defrosting demand is obtained, the water temperature information of the engine needs to be controlled to be kept above a second temperature threshold, wherein the second temperature threshold is preferably 75℃.

[0072] In an embodiment, the specific implementation steps of the real-time adjustment of the charging and discharging power of the power battery in the self-heating at idle speed mode have been described in detail in the power battery self-heating method provided in the first embodiment of the present application, and specifically, reference can be made to the foregoing, which will not be repeated here.

[0073] Step S217: The power battery controller 110 judges whether the battery temperature information of the power battery is higher than a third temperature threshold.

[0074] Step S218: When the power battery controller 110 judges that the answer is yes, it stops sending the heating request to the vehicle controller 120.

[0075] Step S219: When the self-heating at idle speed exit condition is met, the vehicle controller 120 controls to exit the self-heating at idle speed control.

[0076] In an embodiment, the self-heating at idle speed exit condition includes: (1) the battery temperature information is higher than a third temperature threshold, the third temperature threshold is preferably -3℃; (2) the heating request is not obtained; (3) the gear information does not correspond to the P / N gear state; (4) if there is a heating / defrosting demand, the water temperature is lower than a second temperature threshold, and the holding time exceeds a second time threshold, wherein the second time threshold is preferably 60s, and the second temperature threshold is preferably 75; (5) any one of the engine operation information and / or the vehicle fault information fails and / or fails to hinder the execution of the self-heating at idle speed control. As long as any one of the conditions is met, the self-heating at idle speed control is exited.

[0077] In an embodiment, the flow of the self-heating at driving mode in the power battery self-heating method provided in the second embodiment of the present application can be seen from Figure 3 , including the following steps:

[0078] Step S221: The power battery controller 110 obtains the battery temperature information of the power battery, and judges whether the battery temperature information is lower than a first temperature threshold.

[0079] Step S222: When the determination is YES, the power battery controller 110 sends a heating request to the vehicle controller 120.

[0080] Step S223: The engine controller 130 acquires engine operation information and sends it to the vehicle controller 120.

[0081] Step S224: The vehicle controller 120 acquires gear information and vehicle fault information.

[0082] Step S225: When the driving self-heating condition is met, the vehicle controller 120 generates driving self-heating mode information.

[0083] Step S226: According to the driving self-heating mode information, the vehicle controller 120 controls the power battery controller 110 and the engine controller 130 to cooperate with each other to realize repeated charging and discharging of the power battery to achieve self-heating of the power battery.

[0084] In an embodiment, the corresponding execution processes from step S221 to step S224 are the same as or similar to steps S211 to S214, except that the heating / defrosting demand and water temperature are no longer collected. Therefore, the specific embodiments can refer to the related description in the foregoing, which will not be repeated here.

[0085] In an embodiment, the entry conditions required for the driving self-heating mode include: (1) the battery temperature information is lower than the first temperature threshold, wherein the first temperature threshold is preferably -5°C, and there is no related fault for the collection of the battery temperature information, for example, the temperature sensor for collecting the battery temperature information is in working condition; (2) the vehicle is in ready and the gear information corresponds to the D gear state; (3) the vehicle fault information acquired by the vehicle controller 120 corresponds to the fault-free state, or the fault state is determined not to hinder the execution of the idling self-heating mode, and the engine operation information corresponds to the working condition satisfying the execution condition, and the engine is in normal working condition. After all the above conditions are met, the driving self-heating mode can be controlled to enter.

[0086] In an embodiment, the constraint condition for executing the driving self-heating control mainly lies in real-time adjustment of the charging and discharging power according to the low-temperature charging and discharging capability of the power battery and the demand power of the vehicle. The adjustment of the charging and discharging power of the power battery in the driving self-heating mode has been described in detail in the power battery self-heating method provided in the first embodiment of the present application. Specifically, reference can be made to the foregoing, which will not be repeated here. The steps of actually performing the power battery self-heating include controlling the power battery to repeatedly charge and discharge within a preset power range in the driving state to realize the temperature rise of the battery.

[0087] Step S227: The power battery controller 110 judges whether the battery temperature information of the power battery is higher than the third temperature threshold.

[0088] Step S228: When the power battery controller 110 judges YES, the power battery controller 110 stops sending the heating request to the vehicle controller 120.

[0089] Step S229: When the driving self-heating exit condition is met, the vehicle controller 120 controls to exit the driving self-heating control.

[0090] In an embodiment, the driving self-heating exit condition includes: (1) the battery temperature information is higher than the third temperature threshold; (2) the heating request is not obtained; (3) the gear information does not correspond to the D state; (4) there is vehicle fault information corresponding to the situation that the self-heating cannot be met. Preferably, as long as any one of them is met, the driving self-heating exit condition is met, and the driving self-heating control is exited to stop the repeated charging and discharging of the power battery.

[0091] In an embodiment, in the step of controlling the battery to repeatedly charge and discharge in steps S216 and S226, the step includes: obtaining the power information of the power battery; judging whether the initial power information is lower than the upper power threshold; if YES, starting the engine to charge the battery until the power information is higher than the upper power threshold; if NO, controlling the battery to discharge until the power information is lower than the lower power threshold; when the power information is lower than the lower power threshold, controlling the battery to charge, and when the power information is higher than the upper power threshold, controlling the battery to discharge, so as to control the battery to repeatedly charge and discharge within the lower power threshold and the upper power threshold.

[0092] In an embodiment, for the step of controlling the battery to repeatedly charge and discharge in steps S216 and S226, the power battery self-heating method provided in the first embodiment of the present application has been described in detail, and the foregoing can be referred to for details, which will not be repeated here. Specifically, whether it is the idle self-heating mode or the driving self-heating mode, the characteristics of the increased low-temperature battery internal resistance are relied on to realize the repeated charging and discharging of the power battery within the preset upper and lower battery power thresholds on the basis of safety and without affecting the battery life, combined with the power demand of the vehicle, to ultimately realize the uniform heating of the battery.

[0093] The second embodiment of the application provides a power battery self-heating method, which is applied to a hybrid electric vehicle. For an idle self-heating mode, the method comprises the following steps: step S211: a power battery controller 110 acquires battery temperature information of the power battery, and judges whether the battery temperature information is lower than a first temperature threshold; step S212: the power battery controller 110 sends a heating request to a vehicle controller 120 when the judgment is yes; step S213: an engine controller 130 acquires engine working information and sends the information to the vehicle controller 120; step S214: the vehicle controller 120 acquires gear information and vehicle fault information, acquires water temperature information of the engine if heating / defrosting demand information is acquired; step S215: the vehicle controller 120 generates idle self-heating mode information when idle self-heating conditions are met; step S216: idle self-heating control is performed according to the idle self-heating mode information, and the vehicle controller 120 controls the power battery controller 110 and the engine controller 130 to cooperate with each other to realize repeated charging and discharging of the power battery so as to realize self-heating of the power battery; step S217: the power battery controller 110 judges whether the battery temperature information of the power battery is higher than a third temperature threshold; step S218: the power battery controller 110 stops sending the heating request to the vehicle controller 120 when the judgment is yes; and step S219: the vehicle controller 120 controls to exit the idle self-heating control when idle self-heating exit conditions are met. For a driving self-heating mode, the method comprises the following steps: step S221: the power battery controller 110 acquires battery temperature information of the power battery, and judges whether the battery temperature information is lower than the first temperature threshold; step S222: the power battery controller 110 sends a heating request to the vehicle controller 120 when the judgment is yes; step S223: the engine controller 130 acquires engine working information and sends the information to the vehicle controller 120; step S224: the vehicle controller 120 acquires gear information and vehicle fault information; step S225: the vehicle controller 120 generates driving self-heating mode information when driving self-heating conditions are met; step S226: driving self-heating control is performed according to the driving self-heating mode information, and the vehicle controller 120 controls the power battery controller 110 and the engine controller 130 to cooperate with each other to realize repeated charging and discharging of the power battery so as to realize self-heating of the power battery; step S227: the power battery controller 110 judges whether the battery temperature information of the power battery is higher than the third temperature threshold; step S228: the power battery controller 110 stops sending the heating request to the vehicle controller 120 when the judgment is yes; and step S229: the vehicle controller 120 controls to exit the driving self-heating control when driving self-heating exit conditions are met. The power battery self-heating method provided by the second embodiment of the application is a refinement of the power battery self-heating method provided by the first embodiment.Therefore, the technical effects of the power battery self-heating method provided by the second embodiment have been described in detail in the foregoing, and can be specifically referred to the corresponding description in the first embodiment, which will not be described herein again.

[0094] Third embodiment

[0095] Figure 4 A structural schematic diagram of a power battery self-heating system provided by the third embodiment of the present application; Figure 5 A structural schematic diagram of a vehicle controller provided by the third embodiment of the present application. In order to clearly describe the power battery self-heating system 100 provided by the third embodiment of the present application, please refer to Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 and Figure 5 .

[0096] The power battery self-heating system 100 provided by the third embodiment of the present application includes a power battery controller 110, a vehicle controller 120, and an engine controller 130. The specific structural schematic diagram can be referred to Figure 4 .

[0097] In an embodiment, the power battery controller 110 is configured to acquire battery temperature information of the power battery, generate a heating request when the battery temperature information is lower than a first temperature threshold, and perform a response according to self-heating mode information generated by the vehicle controller 120 to control the power battery to repeatedly charge and discharge within a preset power range.

[0098] In an embodiment, the power battery controller 110, which is preferably a battery management system (BMS), includes a plurality of power batteries, such as lithium batteries. The power battery controller 110 is configured to collect information of the power batteries and perform a response according to self-heating mode information sent by the vehicle controller 120 to control the power battery to repeatedly charge and discharge within a preset power range to achieve self-heating. Specifically, the power battery controller 110 can also be configured to, for example, in an idle speed self-heating mode, control a generator to repeatedly drag the engine to maintain an idle speed of the engine, and collect charge and discharge capacity of the power battery in a low-temperature state to realize real-time adjustment of battery charge and discharge power.

[0099] In an embodiment, the vehicle controller 120 is configured to perform a response when a heating request is acquired, acquire vehicle state information, and match corresponding self-heating mode information according to the vehicle state information. The vehicle state information includes gear information, engine operation information, and vehicle fault information. The self-heating mode information includes idle speed self-heating mode information and driving self-heating mode information.

[0100] In an embodiment, the vehicle controller 120, preferably can be a vehicle control unit VCU, as the central control unit of the hybrid vehicle, is the core of the entire control system, in this embodiment is mainly used for collecting relevant information analysis and processing, so also can be other vehicle terminal. Therefore, the specific structure of the vehicle controller 120 can refer to Figure 5 , including: processor A101 and memory A201, wherein the processor A101 is configured to execute the computer program A6 stored in the memory A201 to perform the following operations: obtaining vehicle state information when a heating request is obtained, matching corresponding self-heating mode information according to the vehicle state information, the vehicle state information includes gear information, engine working information, vehicle fault information, and the self-heating mode information includes idle self-heating mode information and driving self-heating mode information.

[0101] In an embodiment, the vehicle controller 120 provided in the embodiment includes at least one processor A101 and at least one memory A201. The at least one processor A101 can be referred to as a processing unit A1, and the at least one memory A201 can be referred to as a storage unit A2.

[0102] In an embodiment, the vehicle controller 120 provided in the embodiment can include a plurality of memories A201 (referred to as storage units A2).

[0103] The storage unit A2 can be a volatile memory or a non-volatile memory, or both. The non-volatile memory can be a Read Only Memory (ROM), a Programmable Read-Only Memory (PROM), an Erasable Programmable Read-Only Memory (EPROM), an Electrically Erasable Programmable Read-Only Memory (EEPROM), a ferromagnetic random access memory (FRAM), a Flash Memory, a magnetic surface memory, an optical disk, or a Compact Disc Read-Only Memory (CD-ROM). The magnetic surface memory can be a disk memory or a tape memory. The volatile memory can be a Random Access Memory (RAM) used as an external cache. By way of example and not limitation, many forms of RAM are available, such as Static Random Access Memory (SRAM), Synchronous Static Random Access Memory (SSRAM), Dynamic Random Access Memory (DRAM), Synchronous Dynamic Random Access Memory (SDRAM), Double Data Rate Synchronous Dynamic Random Access Memory (DDR SDRAM), Enhanced Synchronous Dynamic Random Access Memory (ESDRAM), SyncLink Dynamic Random Access Memory (SLDRAM), and Direct Rambus Random Access Memory (DRRAM).The storage unit A2 described in the embodiments of the present application is intended to include, but not limited to, these and any other suitable types of memory.

[0104] In an embodiment, the vehicle controller 120 further comprises a bus connecting different components (e.g. the processor A101 and the memory A201, the display device A3, etc.). The display device A3 is preferably a touch display. For example, the battery temperature information can be obtained in real time through the display device A3, and the generation and / or stop of the heating request can be triggered through the touch display, so as to control whether to start the self-heating mode of the power battery.

[0105] In an embodiment, the vehicle controller 120 in the embodiments can further comprise a communication interface (e.g. the I / O interface A4), which can be used for communication with external devices. Similarly, the battery self-heating system 100 provided in the embodiments can also be connected with the power battery controller 110 and the engine controller 130 through the I / O interface A4 of the vehicle controller 120, so as to collect corresponding information for processing and analysis, etc.

[0106] In an embodiment, the vehicle controller 120 can further comprise a communication device A5. In an embodiment, the hybrid vehicle can be connected to the user through an I / O interface A4 and / or the communication device A5 through a communication mode which can include but is not limited to wireless or wired communication mode, and the user can obtain the vehicle information including but not limited to the battery temperature information through a mobile terminal or other external device, and determine whether to trigger the generation and / or stop the generation of the heating request, so as to control whether to start the self-heating mode of the power battery. The external device is an intelligent terminal which can collect relevant information and determine whether to trigger the generation and / or stop the generation of the heating request by the user, such as a mobile terminal or a personal PC. Preferably, the mobile terminal can be a mobile phone, a tablet computer, a personal digital assistant (PDA), a mobile Internet device (MID), a wearable device (such as a smart watch), and the like. The corresponding information can be processed and displayed through an application (such as an APP) on the mobile terminal, and the corresponding operation can be performed, so as to improve the use efficiency. Further, the wireless / wired technology for establishing the communication connection can include but is not limited to USB connection for the wired technology, and Global System for Mobile Communication (GSM), Enhanced Data GSM Environment (EDGE), wideband code division multiple access (W-CDMA), Code division access (CDMA), time division multiple access (TDMA), Bluetooth, Wireless Fidelity (WiFi) (such as American Institute of Electrical Engineers (IEEE) 802.11a, IEEE 802.11b, IEEE 802.11g and / or IEEE 802.11n), Voice over Internet Protocal (VoIP), Worldwide Interoperability for Microwave Access (Wi-Max), other protocols for mail, instant messaging and short message, and any other suitable communication protocol, and even can include those protocols which are not yet developed.

[0107] In an embodiment, the vehicle controller 120 is the most important core of the battery self-heating system 100, and with the help of the power battery controller 110 and the engine controller 130, the computer program A6 stored in the storage unit A2 makes the vehicle controller 120 of the embodiment implement the steps of the power battery self-heating method as described in the first embodiment or the second embodiment when the computer program A6 is executed by the processing unit A1. Specifically, the implementation of the steps can refer to the description in the first embodiment or the second embodiment, and thus will not be repeated here.

[0108] In an embodiment, the engine controller 130 is used to execute a response according to the self-heating mode information generated by the vehicle controller 120 to drive the generator to charge the power battery, thereby achieving the self-heating of the power battery.

[0109] In an embodiment, the engine controller 130, which is preferably an engine management system (EMS), is mainly used to collect engine state information and control the engine. In the power battery self-heating method provided by the application, the engine controller 130 can implement the following steps, but is not limited to them: when the power battery needs to be charged, the engine controller 130 controls the engine to drive the generator to charge the power battery. Specifically, the control can also include, for example, when the power battery is discharged in the idle self-heating mode, because the generator reversely drags the engine to maintain the speed, the engine controller 130 should control the stop of fuel injection or the adjustment of the fuel injection amount. Furthermore, in addition to the mobile phone engine working information for detection, the required power information of the engine will also be collected in the self-heating mode to adjust the charging and discharging power in real time in cooperation with the vehicle controller 120.

[0110] In an embodiment, the power battery self-heating system 100 provided by the third embodiment of the application can implement the steps of the power battery self-heating method as described in the first embodiment or the second embodiment through the cooperation among the power battery controller 110, the vehicle controller 120, and the engine controller 130. Specifically, the storage unit A2 stores the computer program A6, and when the computer program A6 is executed by the processing unit A1, the vehicle controller 120 of the embodiment implements the steps of the power battery self-heating method as described in the first embodiment or the second embodiment. For example, Figure 1S1: in response to a heating request; S2: obtaining vehicle state information, and matching corresponding self-heating mode information according to the vehicle state information, wherein the vehicle state information comprises gear information, engine working information and vehicle fault information, and the self-heating mode information comprises idling self-heating mode information and driving self-heating mode information; and S3: executing a response according to the self-heating mode information, and controlling the power battery to repeatedly charge and discharge to realize self-heating of the power battery.

[0111] The power battery self-heating system 100 provided by the third embodiment of the present application comprises a power battery controller 110, a vehicle controller 120 and an engine controller 130. The power battery controller 110 is configured to acquire battery temperature information of the power battery, generate a heating request when the battery temperature information is lower than a first temperature threshold, and perform a response according to self-heating mode information generated by the vehicle controller 120 to control the power battery to repeatedly charge and discharge within a preset power range. The vehicle controller 120 is configured to perform a response when the heating request is acquired, acquire vehicle state information, match corresponding self-heating mode information according to the vehicle state information, and perform a response according to the self-heating mode information. The vehicle state information comprises gear information, engine working information and vehicle fault information, and the self-heating mode information comprises an idle speed self-heating mode information and a driving self-heating mode information. The engine controller 130 is configured to perform a response according to the self-heating mode information generated by the vehicle controller 120 to charge the power battery and cooperatively realize self-heating of the power battery. Further, the power battery self-heating system 100 comprises a memory A101 and a processor A201, and the processor A201 is configured to execute a computer program A6 stored in the memory A101 to realize the steps of the power battery self-heating method described in the first embodiment or the second embodiment. Therefore, the power battery self-heating system 100 provided by the present embodiment can realize self-heating of the power battery by controlling the power battery to repeatedly charge and discharge within a preset power range without adding new hardware architecture, but only relying on the existing system architecture of the hybrid vehicle. This reduces the cost of the vehicle, realizes better heating uniformity, and improves the user experience. In addition, further, the control method of the vehicle provided by an embodiment of the present application can also enter different self-heating modes according to different states of the vehicle to realize adjustable and controllable self-heating rates. Moreover, the operability of the self-heating mode is increased by taking the identification of the heating request as a trigger condition and identifying the low-temperature condition or manually triggering. In addition, the adaptability of the charging and discharging power is adjusted by considering the required power of the vehicle and the charging and discharging capacity of the battery under low-temperature conditions during the repeated charging and discharging process, so as to reduce the influence of the repeated charging and discharging on the service life of the power battery. In the idle speed self-heating mode, the heating and defrosting requirements of the vehicle are considered to maintain the water temperature of the heater at a certain temperature, so the self-heating mode is entered or exited according to the water temperature. Moreover, the engine working state and the vehicle fault information are acquired when the battery charging and discharging are switched, so as to prevent the engine working condition from fluctuating sharply and avoid NVH problems. Therefore, the present application can utilize the characteristics of the increased internal resistance of the low-temperature battery, realize the repeated charging and discharging of the battery within a preset power range on the basis of safety and without affecting the service life of the battery, combine the power demand of the vehicle, realize the uniform temperature rise of the battery, reduce the hardware cost, reduce the temperature difference during the heating process, thereby reducing the irreversible damage of the battery caused by the temperature difference, and also reducing the operation of the user, increasing the convenience of the user, and improving the user experience.

[0112] The third embodiment of the present application also provides a hybrid vehicle comprising the power battery self-heating system 100 as described above.

[0113] The third embodiment of the present application also provides a computer readable storage medium storing a computer program A6, which, when executed by a processor A101, implements the steps of the power battery self-heating method as described in the first embodiment or the second embodiment.

[0114] In an embodiment, the computer readable storage medium provided by the present embodiment can include any entity or device capable of carrying computer program codes, recording media, such as ROM, RAM, magnetic disk, optical disk, flash memory, etc.

[0115] The method steps performed by the hybrid vehicle and the computer program A6 stored in the computer readable storage medium provided by the third embodiment of the present application when executed by the processor A101 and the technical effects that can be achieved have been described in detail in the foregoing, and will not be described here.

[0116] The technical features of the above embodiments can be combined in any manner. In order to make the description concise, all possible combinations of the technical features in the above embodiments are not described, however, as long as the combinations of the technical features do not exist contradictions, they should be considered as the scope of the present application.

[0117] It should be noted that in this paper, the term "comprise", "include" or any other variant thereof is intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or device. Without more limitations, the element defined by the statement "comprises a" does not exclude the presence of another identical element in the process, method, article or device comprising the element, in addition, the components, features, elements with the same name in different embodiments of the present application may have the same meaning or different meanings, and the specific meaning needs to be determined according to its explanation in the specific embodiment or further combined with the context in the specific embodiment. In this paper, unless otherwise stated, the meaning of "a plurality of" or "several" is two or more.

[0118] It should be understood that, although each step in the flowchart in the embodiments of the present application is shown in sequence according to the arrow, these steps are not necessarily executed in sequence according to the arrow. Unless explicitly stated herein, the execution of these steps is not strictly limited in sequence, and they can be executed in other sequences. Moreover, at least part of the steps in the figure can include multiple sub-steps or multiple stages, which are not necessarily executed at the same time, but can be executed at different times, and the execution sequence is not necessarily sequential, but can be alternately executed with at least part of other steps or sub-steps or stages of other steps.

[0119] Those skilled in the art can understand that all or part of the steps of the above-mentioned method embodiments can be completed by program instruction related hardware, and the foregoing program can be stored in a computer readable storage medium. When the program is executed, the steps including the above-mentioned method embodiments are executed. The foregoing storage medium includes ROM, RAM, magnetic disc or optical disc and various media that can store program codes.

[0120] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A method for self-heating of a power battery applied to a hybrid electric vehicle, characterized in that, The method comprises the following steps: responding to a heating request; obtaining vehicle state information, and matching corresponding self-heating mode information according to the vehicle state information, wherein the vehicle state information comprises gear information, engine operation information and vehicle fault information, and the self-heating mode information comprises idle self-heating mode information and driving self-heating mode information; performing a response according to the self-heating mode information, and controlling the power battery to repeatedly charge and discharge to realize self-heating of the power battery; in the step of performing a response according to the self-heating mode information and controlling the power battery to repeatedly charge and discharge to realize self-heating of the power battery, when the self-heating mode information comprises idle self-heating mode information, the first actual discharge efficiency of the power battery is adjusted in real time to be smaller between the battery low-temperature charge-discharge capability and the required power for engine reverse driving during the discharging process, and the first actual charge efficiency of the power battery is adjusted in real time to be smaller between the battery low-temperature charge-discharge capability and the self-heating power calibration value during the charging process; in the step of performing a response according to the self-heating mode information and controlling the power battery to repeatedly charge and discharge to realize self-heating of the power battery, when the self-heating mode information comprises driving self-heating mode information, the second actual discharge efficiency of the power battery is adjusted in real time to be smaller between the battery low-temperature charge-discharge capability and the required power for engine reverse driving during the discharging process, and the second actual charge efficiency of the power battery is adjusted in real time to be smaller between the battery low-temperature charge-discharge capability and the self-heating power calibration value during the charging process.

2. The power battery self-heating method of claim 1, before the step of responding to a heating request, comprising: obtaining battery temperature information of the power battery, and generating the heating request when the battery temperature information is lower than a first temperature threshold; and / or, generating and / or stopping generating the heating request according to user operation.

3. The power battery self-heating method of claim 1, in the step of obtaining vehicle state information and matching corresponding self-heating mode information according to the vehicle state information, comprising: matching the idle self-heating mode information when the gear information corresponds to P / N gear; matching the driving self-heating mode information when the gear information corresponds to D gear.

4. The power battery self-heating method of claim 3, in the step of performing a response according to the self-heating mode information when the self-heating mode information comprises idle self-heating mode information, comprising: performing idle self-heating control according to the idle self-heating mode information when the vehicle state information meets the idle self-heating condition, wherein the idle self-heating control comprises: controlling the engine generator to maintain the idle speed of the engine during the discharging process of the power battery, and controlling the fuel injection amount of the engine; controlling the water temperature of the engine to be above a second temperature threshold if heating / defrosting demand information is obtained; stopping generating the heating request when the battery temperature information is higher than a third temperature threshold.

5. The method of claim 4, wherein the idle self-heating condition comprises: a gear state is maintained for more than a first time threshold; the vehicle fault information corresponds to a no fault state; the engine operation information corresponds to the engine being in a normal operation state; the water temperature is higher than a fourth temperature threshold if the heating / defrosting demand information is obtained.

6. The method of claim 4, wherein the step of performing a response according to the self-heating mode information comprises: when an idle self-heating exit condition is met, exiting the idle self-heating control to stop the self-heating of the battery, the idle self-heating exit condition comprising: the battery temperature information being higher than the third temperature threshold; or, the heating request not being obtained; or, the gear information not corresponding to a P / N gear state; or, if the heating / defrosting demand information is obtained, the water temperature being lower than the second temperature threshold and being maintained for more than a second time threshold; or, any one of the vehicle fault information corresponding to a self-heating condition that cannot be met.

7. The method of claim 3, wherein the step of performing a response according to the self-heating mode information comprises: when the vehicle state information meets an on-road self-heating condition, performing an on-road self-heating control according to the on-road self-heating mode information, the on-road self-heating condition comprising the vehicle fault information corresponding to a no fault state, the on-road self-heating control comprising: when the battery temperature information is higher than a third temperature threshold, stopping the generation of the heating request.

8. The method of claim 7, wherein the step of performing a response according to the self-heating mode information comprises: when an on-road self-heating exit condition is met, exiting the on-road self-heating control to stop the self-heating of the battery, the on-road self-heating exit condition comprising: the battery temperature information being higher than the third temperature threshold; or, the heating request not being obtained; or, the gear information not corresponding to a D gear state; or, any one of the vehicle fault information corresponding to a self-heating condition that cannot be met.

9. The method of claim 1, wherein the step of controlling the battery to repeatedly charge and discharge comprises: obtaining power information of the power battery; determining whether the power information is lower than an upper power threshold according to an initial power information: if yes, starting the engine to charge the battery until the power information is higher than the upper power threshold; if no, controlling the battery to discharge until the power information is lower than a lower power threshold; when the power information is lower than the lower power threshold, controlling the battery to charge, and when the power information is higher than the upper power threshold, controlling the battery to discharge, so as to control the power battery to repeatedly charge and discharge within a range of the lower power threshold and the upper power threshold.

10. A power cell self-heating system, characterized in that, comprising a power battery controller, a vehicle controller, and an engine controller. The power battery controller is configured to acquire battery temperature information of the power battery, generate a heating request when the battery temperature information is lower than a first temperature threshold, perform a response according to self-heating mode information generated by the vehicle controller, and control the power battery to repeatedly charge and discharge within a preset power range to achieve battery self-heating. The vehicle controller is configured to perform a response when the heating request is acquired, acquire vehicle state information, and match corresponding self-heating mode information according to the vehicle state information, wherein the vehicle state information includes gear information, engine operation information, and vehicle fault information, and the self-heating mode information includes idle speed self-heating mode information and driving self-heating mode information. The engine controller is configured to perform a response according to the self-heating mode information generated by the vehicle controller, charge the power battery, and cooperate to achieve self-heating of the power battery. When the self-heating mode information includes idle speed self-heating mode information, the step of performing a response according to the self-heating mode information to control the power battery to repeatedly charge and discharge to achieve self-heating of the power battery includes: in the discharging process, adjusting a first actual discharging efficiency of the power battery in real time to be smaller between a battery low-temperature charging and discharging capability and a power required for engine reverse traction; and in the charging process, adjusting a first actual charging efficiency of the power battery in real time to be smaller between the battery low-temperature charging and discharging capability and a self-heating power calibration value. When the self-heating mode information includes driving self-heating mode information, the step of performing a response according to the self-heating mode information to control the power battery to repeatedly charge and discharge to achieve self-heating of the power battery includes: in the discharging process, adjusting a second actual discharging efficiency of the power battery in real time to be smaller between the battery low-temperature charging and discharging capability and a power required by the vehicle; and in the charging process, adjusting a second actual charging efficiency of the power battery in real time to be smaller between the battery low-temperature charging and discharging capability and the self-heating power calibration value.

11. A hybrid vehicle characterized by comprising: The power battery self-heating system includes the power battery self-heating system according to claim 10.

12. A computer-readable storage medium, characterized in that, The computer readable storage medium stores a computer program, and the computer program is executed by a processor to implement the steps of the power battery self-heating method according to any one of claims 1 to 9.

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