A method and device for heating a power vehicle battery

Abstract

An embodiment of the present application provides a method and device for heating a power vehicle battery, the method comprising: when a battery heating request signal is received, first obtaining a battery discharge capability signal, a battery charging capability signal, and a charging pile capability signal; then calculating the available power of the heater based on the battery discharge capability signal, the battery charging capability signal, and the charging pile capability signal; and controlling the heater to gradually increase the working gear to heat the battery based on the available power of the heater; before the heater lowers the working gear, adjusting the target output power of the charging pile based on the battery charging capability signal; after the charging pile completes the actual output power adjustment based on the target output power, downshifting the heater, thereby avoiding battery loss caused by overcharging and over-discharging of the battery during the process of adjusting the working gear of the heater.

Description

Technical Field

[0001] The present application relates to the field of automobile technology, and in particular to a method and device for heating a power vehicle battery. Background Art

[0002] Electric vehicles are becoming an increasingly common part of people's lives. When charging electric vehicles in ground-based charging mode at low temperatures, it's necessary to activate the battery heating function to improve charging performance. Existing technologies typically use water to heat the battery. However, in practice, it's been found that these methods use heaters with multiple operating positions. During this process, the charging station can't respond to the charging current in a timely manner, leading to overcharging and overdischarging of the battery, which in turn increases battery loss. Summary of the Invention

[0003] The purpose of the embodiments of the present application is to provide a method and device for heating a battery of a power vehicle, which can avoid battery loss caused by overcharging or over-discharging of the battery during the process of adjusting the working gear of the heater.

[0004] A first aspect of an embodiment of the present application provides a method for heating a power vehicle battery, comprising:

[0005] When a battery heating request signal is received, a battery discharge capability signal, a battery charge capability signal, and a charging pile capability signal are obtained;

[0006] Calculating the available power of the heater according to the battery discharge capability signal, the battery charge capability signal, and the charging pile capability signal;

[0007] controlling the heater to gradually increase the working gear according to the available power of the heater to heat the battery;

[0008] Before the heater lowers the operating gear, adjusting the target output power of the charging pile according to the battery charging capacity signal;

[0009] After the charging pile completes the adjustment of the actual output power according to the target output power, the heater is downshifted.

[0010] In the above implementation process, when a battery heating request signal is received, the battery discharge capacity signal, battery charging capacity signal, and charging pile capacity signal are first obtained; then the available power of the heater is calculated based on the battery discharge capacity signal, the battery charging capacity signal, and the charging pile capacity signal; and the heater is controlled to gradually increase the working gear to heat the battery based on the available power of the heater; before the heater lowers the working gear, the target output power of the charging pile is determined based on the battery charging capacity signal; after the charging pile completes the actual output power adjustment, the heater is downgraded, which can avoid battery loss caused by overcharging and over-discharging during the process of adjusting the working gear of the heater.

[0011] Furthermore, the available power of the heater is calculated according to the battery discharge capability signal, the battery charge capability signal, and the charging pile capability signal, including:

[0012] Determining the battery charging capability and obtaining the DC power converter power according to the battery charging capability signal;

[0013] When the battery charging capacity is 0, the available power of the heater is calculated according to a preset first power calculation algorithm, the battery discharge capacity signal, the power of the DC power converter, and the charging pile capacity signal;

[0014] When the battery charging capacity is greater than 0, the heater available power is calculated according to a preset second power calculation algorithm, the DC power converter power and the charging pile capacity signal.

[0015] Furthermore, controlling the heater to gradually increase the working gear according to the available power of the heater to heat the battery includes:

[0016] determining a battery discharge capacity according to the battery discharge capacity signal;

[0017] When the discharge capacity of the battery is less than a preset discharge capacity threshold, the heater is controlled to increase the working gear step by step according to the available power of the heater to heat the battery.

[0018] Furthermore, after adjusting the target output power of the charging pile according to the battery charging capability signal, the method further includes:

[0019] Obtain high-voltage accessory power consumption, power battery bus current, and power battery target line voltage;

[0020] The actual output power of the charging pile is calculated according to the high-voltage accessory power, the power battery bus current and the power battery target line voltage.

[0021] Furthermore, after controlling the heater to gradually increase the operating gear according to the available power of the heater to heat the battery, the method further includes:

[0022] During the battery heating process, obtaining the current actual output power of the charging pile and the current power consumption of the heater, and calculating the power sum of the battery charging capacity and the current power consumption;

[0023] When the actual output power of the charging pile is 0 and the battery charging capacity is greater than the preset charging capacity threshold, the heating operation of the battery is actively exited;

[0024] When the actual output power of the charging pile is 0 and the battery charging capacity is not greater than the preset charging capacity threshold, the available power of the first new heater is calculated according to a preset third power calculation algorithm, and the heater is controlled to heat the battery according to the available power of the first new heater;

[0025] When the actual output power of the charging pile is continuously greater than 0 within a preset time period and the actual output power of the charging pile is less than the current power consumption, the second new heater available power is recalculated according to the actual output power of the charging pile and a preset fourth power calculation algorithm, and the operating gear of the heater is adjusted according to the second new heater available power;

[0026] When the actual output power of the charging pile is greater than the power sum, a charging current request is generated according to a preset current adjustment algorithm to reduce the actual output power of the charging pile. The charging current request is used to reduce the charging current of the battery.

[0027] A second aspect of an embodiment of the present application provides a power vehicle battery heating device, the power vehicle battery heating device comprising:

[0028] an acquisition unit, configured to acquire a battery discharge capability signal, a battery charge capability signal, and a charging pile capability signal upon receiving a battery heating request signal;

[0029] a calculation unit, configured to calculate the available power of the heater according to the battery discharge capability signal, the battery charge capability signal, and the charging pile capability signal;

[0030] a control unit, configured to control the heater to gradually increase its operating gear according to the available power of the heater to heat the battery;

[0031] an adjustment unit, configured to adjust a target output power of the charging pile according to the battery charging capability signal before the heater lowers its operating gear;

[0032] A downshift unit is used to downshift the heater after the charging pile completes the actual output power adjustment according to the target output power.

[0033] In the above implementation process, the acquisition unit obtains the battery discharge capacity signal, the battery charging capacity signal, and the charging pile capacity signal when receiving the battery heating request signal; the calculation unit then calculates the available power of the heater based on the battery discharge capacity signal, the battery charging capacity signal, and the charging pile capacity signal; the control unit controls the heater to gradually increase the working gear to heat the battery according to the available power of the heater; the adjustment unit adjusts the target output power of the charging pile according to the battery charging capacity signal before the heater lowers the working gear; the downshift unit downshifts the heater after the charging pile completes the actual output power adjustment, which can avoid battery loss caused by overcharging and over-discharging during the process of adjusting the working gear of the heater.

[0034] Furthermore, the calculation unit includes:

[0035] a first determining subunit, configured to determine the battery charging capability and obtain the DC power converter power according to the battery charging capability signal;

[0036] The available power calculation sub-unit is used to calculate the available power of the heater according to a preset first power calculation algorithm, the battery discharge capacity signal, the DC power converter power and the charging pile capacity signal when the battery charging capacity is 0; and to calculate the available power of the heater according to a preset second power calculation algorithm, the DC power converter power and the charging pile capacity signal when the battery charging capacity is greater than 0.

[0037] Furthermore, the control unit includes:

[0038] a second determining subunit, configured to determine the battery discharge capacity according to the battery discharge capacity signal;

[0039] The control subunit is configured to control the heater to gradually increase its operating gear according to the available power of the heater when the discharge capacity of the battery is less than a preset discharge capacity threshold, so as to heat the battery.

[0040] A third aspect of an embodiment of the present application provides an electronic device, including a memory and a processor, wherein the memory is used to store a computer program, and the processor runs the computer program to enable the electronic device to execute the power vehicle battery heating method described in any one of the first aspects of the embodiment of the present application.

[0041] A fourth aspect of an embodiment of the present application provides a computer-readable storage medium storing computer program instructions. When the computer program instructions are read and executed by a processor, the power vehicle battery heating method described in any one of the first aspects of the embodiment of the present application is executed. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments of the present application. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0043] Figure 1 A schematic flow chart of a method for heating a power vehicle battery provided in an embodiment of the present application;

[0044] Figure 2 A schematic structural diagram of a power vehicle battery heating device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0045] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application.

[0046] It should be noted that similar reference numerals and letters represent similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings. At the same time, in the description of this application, the terms "first", "second", etc. are only used to distinguish the description and should not be understood as indicating or implying relative importance.

[0047] Example 1

[0048] Please see Figure 1 , Figure 1 The present invention provides a flow chart of a method for heating a battery in a power vehicle. The method comprises:

[0049] S101 : When a battery heating request signal is received, a battery discharge capability signal, a battery charge capability signal, and a charging pile capability signal are acquired.

[0050] In the embodiment of the present application, the method is applied to a vehicle control unit (VCU), which is not limited in the embodiment of the present application.

[0051] In the embodiment of the present application, the method is applied in a scenario where the battery is in a charging condition, which is not limited in the embodiment of the present application.

[0052] In the embodiment of the present application, upon receiving a battery heating request signal sent by a battery management system (BMS) via the CAN bus, the VCU starts to calculate the available power of the heater.

[0053] In the embodiment of the present application, before calculating the available power of the heater, it is necessary to receive the battery discharge capability signal, the battery charging capability signal, and the charging pile capability signal sent by the BMS.

[0054] In the embodiment of the present application, the heater may be a PTC, HVH or other multi-speed heater, which is not limited in the embodiment of the present application.

[0055] S102 : Determine the battery charging capacity according to the battery charging capacity signal, obtain the DC power converter power, and execute step S103 or step S104 .

[0056] S103: When the battery charging capacity is 0, the heater available power is calculated according to a preset first power calculation algorithm, the battery discharge capacity signal, the DC power converter power, and the charging pile capacity signal, and step S105 is executed.

[0057] In the embodiment of the present application, when the battery charging capacity is 0, the preset first power calculation algorithm is as follows:

[0058] Heater available power = min{charging pile capacity - DCDC power, max(battery discharge capacity - DCDC consumption, heater minimum operating power), actual maximum heater power consumption};

[0059] Among them, the minimum operating power of the heater is the power consumption requirement to meet the stable operation of the heater at the minimum gear, which can be specifically 2kw, and the actual maximum power consumption of the heater can be specifically 12kw. 2kw and 12kw are the actual implementation values ​​of a project applied by this method, which are actually related to the working characteristics of the heater. The specific values ​​can be pre-set, and this embodiment of the application is not limited to this.

[0060] The DCDC power is the power of the DC power converter, and its specific value can be preset, which is not limited in the embodiment of the present application.

[0061] Among them, the charging pile capacity can be determined according to the charging pile capacity signal, and the battery discharge capacity can be determined according to the battery discharge capacity signal, which is not limited in this embodiment of the present application.

[0062] S104: When the battery charging capacity is greater than 0, the available power of the heater is calculated according to the preset second power calculation algorithm, the power of the DC power converter and the charging pile capacity signal, and step S105 is executed.

[0063] In the embodiment of the present application, when the battery charging capacity is greater than 0, the charging pile is used to heat the power battery. The available power of the heater is limited by the capacity of the charging pile. The preset second power calculation algorithm is as follows:

[0064] Heater available power = min{charging pile capacity - DCDC power, actual maximum power consumption of heater}.

[0065] S105 : Determine the battery discharge capacity according to the battery discharge capacity signal.

[0066] S106 : When the discharge capacity of the battery is less than a preset discharge capacity threshold, control the heater to increase the working gear step by step according to the available power of the heater to heat the battery.

[0067] In an embodiment of the present application, when the battery discharge capacity is less than a preset discharge capacity threshold, the battery discharge capacity is less than the power consumption of the heater, and a battery over-discharge problem will occur. Therefore, it is necessary to control the heater to gradually increase the working gear. Specifically, it can be gradually increased according to a preset period to achieve a step-by-step increase in the working gear of the heater.

[0068] In an embodiment of the present application, when the battery discharge capacity is less than the preset discharge capacity threshold, the VCU gradually increases the available power of the heater. Every time the heater increases one level, the actual power consumption of the heater increases one level. Before the charging pile outputs the system required power, the battery discharge power is used to compensate for the increase in the actual power consumption of the heater. The battery discharge power can meet the increase in the actual power consumption of the heater, thereby avoiding the problem of battery over-discharge when the heater is started.

[0069] S107. Before the heater lowers its operating gear, adjust the target output power of the charging pile according to the battery charging capability signal, and obtain the high-voltage accessory power consumption, the power battery bus current, and the power battery target line voltage.

[0070] In this embodiment, before the heater downgrades, the actual output power of the charging pile is the sum of the battery's permitted charging power and the heater's power. When the heater's water temperature reaches a preset threshold, the heater needs to downgrade. At this point, a heater downgrade request is first sent to the VCU via the CAN bus. During this process, the heater maintains its previous operating position. Meanwhile, the VCU requests the charging pile output power equal to the battery's permitted charging power.

[0071] S108. Calculate the actual output power of the charging pile according to the high-voltage accessory power, the power battery bus current, and the power battery target line voltage.

[0072] In the embodiment of the present application, the formula for calculating the actual output power of the charging pile is:

[0073] The actual output power of the charging pile = high-voltage accessory power consumption - power battery bus current × power battery target line voltage.

[0074] In this embodiment of the present application, when downshifting, the heater maintains the previous operating gear while the VCU requests a decrease in charging power, which can lead to a risk of battery over-discharge. When the VCU calculates that the actual output of the charging pile is no greater than the battery's allowable charging power for a certain period of time, indicating that the charging pile output has dropped to the battery's allowable charging capacity and there is no risk of battery overcharge, an immediate downshift request is sent to the heater via the CAN bus. The heater immediately completes the downshift, reducing actual power consumption and thus avoiding the battery over-discharge problem.

[0075] In the embodiment of the present application, since the charging pile output sent by the BMS has a large deviation, it is necessary to indirectly calculate the actual output power of the charging pile based on the battery bus current and the high-voltage accessory power.

[0076] In the embodiment of the present application, after the actual output power of the charging pile is calculated, the actual output power can be adjusted according to the target output power, and step S109 is executed.

[0077] S109: After the charging pile completes the adjustment of the actual output power according to the target output power, the heater is downshifted.

[0078] In the embodiment of the present application, after calculating that the target output power of the charging pile is not greater than the preset time period threshold of the battery's allowable charging power, an immediate downshift request is sent to the heater via the CAN bus to control the heater to perform downshift processing.

[0079] In the embodiment of the present application, the above steps S107 to S109 are implemented to prevent the battery from being overcharged or over-discharged when the heater is downshifted.

[0080] In an embodiment of the present application, when the battery charging capacity is 0, a charging pile is used to heat the power battery. When the available power of the heater exceeds the battery discharge capacity, if the heater is downshifted, the VCU requests the charging current to eliminate the heater consumption, that is, requests the charging current to be reduced. The battery discharge capacity is required to compensate for the heater consumption, resulting in a battery over-discharge problem. Therefore, limiting the available power of the heater to less than the battery discharge capacity can avoid the over-discharge problem.

[0081] In the embodiment of the present application, when the battery charging capacity is greater than 0, the conventional power battery has a charging capacity of at least 0.05C. When the heater downshifts, the charging capacity can compensate for part of the heater consumption and avoid the over-discharge problem. Therefore, it is no longer considered to limit the available power of the heater based on the battery discharge capacity.

[0082] In this embodiment of the present application, when the heater water temperature reaches the target value, the heater needs to downshift. If the heater is directly downshifted at this time, the heater power consumption will be reduced. However, due to the delay in the charging pile output, the charging pile output power will exceed the battery's allowable charging power, causing the battery to overcharge. During this process, a heater downshift request is sent to the VCU via the CAN bus. The heater still maintains the previous operating gear, and the VCU requests that the charging pile output power equal the battery's allowable charging power. This can avoid the battery overcharge caused by the charging pile output delay, which causes the charging pile output to not drop to the battery's allowable power value.

[0083] S110 . During the battery heating process, obtain the current actual output power of the charging pile and the current power consumption of the heater, calculate the power sum of the battery charging capacity and the current power consumption, and execute step S111 or step S112 .

[0084] S111. When the actual output power of the charging pile is 0 and the battery charging capacity is greater than the preset charging capacity threshold, the battery heating operation is actively exited and step S113 is executed.

[0085] S112. When the actual output power of the charging pile is 0 and the battery charging capacity is not greater than the preset charging capacity threshold, the available power of the first new heater is calculated according to the preset third power calculation algorithm, and the heater is controlled to heat the battery according to the available power of the first new heater, and step S113 is executed.

[0086] In the embodiment of the present application, during the battery heating process, when the actual output power of the charging pile drops to 0, if the battery charging capacity is greater than a preset charging capacity threshold, the heating is automatically stopped and the charging pile is allowed to recover. If the battery charging capacity is not greater than the preset charging capacity threshold, the first new heater available power is recalculated, and then the heater is controlled to heat the battery based on the first new heater available power, thereby preventing over-discharge of the power battery. The preset third power calculation algorithm is as follows:

[0087] First, the available power of the new heater = min (battery discharge capacity - DCDC power, actual maximum power consumption of the heater).

[0088] In the embodiment of the present application, during the battery heating process, if the actual power output of the charging pile drops to 0, when the battery charging capacity is greater than the preset charging capacity threshold, it means that the battery already has a certain charging capacity and there is no need to heat the battery by discharging the battery; when the battery charging capacity is not greater than the preset charging capacity threshold, it means that the battery charging capacity is relatively small and battery heating is required.

[0089] S113. When the actual output power of the charging pile is continuously greater than 0 within a preset time period and is less than the current power consumption, the second new heater available power is recalculated based on the actual output power of the charging pile and a preset fourth power calculation algorithm, and the operating gear of the heater is adjusted based on the second new heater available power.

[0090] In the embodiment of the present application, during the battery heating process, if the actual power output of the charging pile is greater than 0 and less than the power consumption of the heater for a preset time period, it is necessary to recalculate the available power of the heater according to the preset fourth power calculation algorithm to avoid over-discharge of the power battery. The preset fourth power calculation algorithm is as follows:

[0091] Heater available power = min (actual output power of the charging pile - DCDC power, actual maximum power consumption of the heater).

[0092] S114. When the actual output power of the charging pile is greater than the power sum, a charging current request is generated according to a preset current adjustment algorithm to reduce the actual output power of the charging pile. The charging current request is used to reduce the charging current of the battery.

[0093] In the embodiment of the present application, the preset current adjustment algorithm includes following a preset charging current reduction rule, which is not limited in the embodiment of the present application.

[0094] In an embodiment of the present application, during the battery heating process, if the actual output power of the charging pile is greater than the battery charging capacity + the heater power, a request to gradually reduce the charging current is generated according to a preset current adjustment algorithm to achieve the actual output power of the charging pile ≤ the battery charging capacity + the heater power, thereby avoiding overcharging of the power battery.

[0095] In the embodiment of the present application, steps S110 to S114 are implemented to prevent the battery from being over-discharged when the output of the charging pile is abnormal.

[0096] In an embodiment of the present application, the method can calculate the allowable operating power of the heater based on the capacity of the charging pile, the battery discharge capacity, and the battery charging capacity, and calculate the actual output of the charging pile based on the high-voltage accessory power and the battery bus current. The heater will be downshifted after the charging pile is adjusted. If there is an abnormality in the output of the charging pile, adjusting the available power of the heater according to the actual output of the charging pile can solve the problem of overcharging and over-discharging during the battery heating process.

[0097] It can be seen that the implementation of the electric vehicle battery heating method described in this embodiment can avoid battery loss caused by overcharging or over-discharging of the battery during the process of adjusting the working gear of the heater.

[0098] Example 2

[0099] Please see Figure 2 , Figure 2 This is a schematic diagram of the structure of a power vehicle battery heating device provided in an embodiment of the present application. Figure 2 As shown, the power vehicle battery heating device includes:

[0100] an acquisition unit 210, configured to acquire a battery discharge capability signal, a battery charge capability signal, and a charging pile capability signal upon receiving a battery heating request signal;

[0101] A calculation unit 220 is configured to calculate the heater available power based on the battery discharge capability signal, the battery charge capability signal, and the charging pile capability signal;

[0102] A control unit 230 is configured to control the heater to gradually increase its operating gear according to the available power of the heater to heat the battery;

[0103] An adjustment unit 240 is configured to adjust the target output power of the charging pile according to the battery charging capability signal before the heater lowers its operating gear;

[0104] The downshift unit 250 is used to downshift the heater after the charging pile completes the adjustment of the actual output power according to the target output power.

[0105] As an optional implementation, the calculation unit 220 includes:

[0106] A first determining subunit 221 is configured to determine the battery charging capability and obtain the DC power converter power according to the battery charging capability signal;

[0107] The calculation subunit 222 is used to calculate the available power of the heater according to a preset first power calculation algorithm, a battery discharge capacity signal, a DC power converter power, and a charging pile capacity signal when the battery charging capacity is 0; and to calculate the available power of the heater according to a preset second power calculation algorithm, a DC power converter power, and a charging pile capacity signal when the battery charging capacity is greater than 0.

[0108] As an optional implementation, the control unit 230 includes:

[0109] A second determining subunit 231 is configured to determine the battery discharge capacity according to the battery discharge capacity signal;

[0110] The control subunit 232 is configured to control the heater to gradually increase its operating gear according to the available power of the heater to heat the battery when the battery discharge capacity is less than a preset discharge capacity threshold, thereby heating the battery.

[0111] As an optional embodiment, the adjustment unit 240 is also used to obtain the high-voltage accessory power consumption, the power battery bus current and the power battery target line voltage before the heater lowers the operating gear; and calculate the actual output power of the charging pile based on the high-voltage accessory power, the power battery bus current and the power battery target line voltage.

[0112] As an optional embodiment, the power vehicle battery heating device further includes:

[0113] A power sum acquisition unit 260 is configured to, after controlling the heater to gradually increase its operating gear according to the heater's available power to heat the battery, acquire the current actual output power of the charging pile and the current power consumption of the heater during the battery heating process, and calculate the power sum of the battery charging capacity and the current power consumption;

[0114] The heating control unit 270 is used to actively exit the heating operation of the battery when the actual output power of the charging pile is 0 and the battery charging capacity is greater than the preset charging capacity threshold; when the actual output power of the charging pile is 0 and the battery charging capacity is not greater than the preset charging capacity threshold, the first new heater available power is calculated according to the preset third power calculation algorithm, and the heater is controlled to heat the battery according to the first new heater available power; and when the actual output power of the charging pile is continuously greater than 0 within a preset time period and the actual output power of the charging pile is less than the current power consumption, the second new heater available power is recalculated according to the actual output power of the charging pile and the preset fourth power calculation algorithm, and the working gear of the heater is adjusted according to the second new heater available power; and when the actual output power of the charging pile is greater than the power sum, a charging current request is generated according to the preset current adjustment algorithm to reduce the actual output power of the charging pile. The charging current request is used to reduce the charging current of the battery.

[0115] In the embodiments of the present application, the explanation of the power vehicle battery heating device can refer to the description in Embodiment 1, which will not be further elaborated in this embodiment.

[0116] It can be seen that the implementation of the electric vehicle battery heating device described in this embodiment can avoid battery loss caused by overcharging or over-discharging of the battery during the process of adjusting the working gear of the heater.

[0117] An embodiment of the present application provides an electronic device, including a memory and a processor, wherein the memory is used to store a computer program, and the processor runs the computer program to enable the electronic device to execute the power vehicle battery heating method in embodiment 1 of the present application.

[0118] An embodiment of the present application provides a computer-readable storage medium storing computer program instructions. When the computer program instructions are read and executed by a processor, the power vehicle battery heating method in embodiment 1 of the present application is executed.

[0119] In the several embodiments provided in this application, it should be understood that the disclosed devices and methods can also be implemented in other ways. The device embodiments described above are merely illustrative. For example, the flowcharts and block diagrams in the accompanying drawings show the possible architectures, functions and operations of the devices, methods and computer program products according to the multiple embodiments of the present application. In this regard, each box in the flowchart or block diagram can represent a module, a program segment or a part of the code, and the module, program segment or a part of the code contains one or more executable instructions for implementing the specified logical functions. It should also be noted that in some alternative implementations, the functions marked in the box can also occur in an order different from that marked in the accompanying drawings. For example, two consecutive boxes can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the block diagram and / or flowchart, and the combination of boxes in the block diagram and / or flowchart, can be implemented using a dedicated hardware-based system that performs the specified function or action, or can be implemented using a combination of dedicated hardware and computer instructions.

[0120] In addition, the functional modules in each embodiment of the present application can be integrated together to form an independent part, or each module can exist independently, or two or more modules can be integrated to form an independent part.

[0121] If the functions are implemented in the form of software function modules and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0122] The foregoing is merely an embodiment of the present application and is not intended to limit the scope of protection of the present application. Various modifications and variations are possible for those skilled in the art. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included within the scope of protection of the present application. It should be noted that similar reference numerals and letters represent similar items in the following figures. Therefore, once an item is defined in one figure, it does not need to be further defined or explained in subsequent figures.

[0123] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present application should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

[0124] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply the existence of any such actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

Claims

1. A method for heating a power vehicle battery, characterized in that: include: When a battery heating request signal is received, a battery discharge capability signal, a battery charge capability signal, and a charging pile capability signal are obtained; Calculating the available power of the heater according to the battery discharge capability signal, the battery charge capability signal, and the charging pile capability signal; controlling the heater to gradually increase the working gear according to the available power of the heater to heat the battery; Before the heater lowers the operating gear, adjusting the target output power of the charging pile according to the battery charging capacity signal; After the charging pile completes the adjustment of the actual output power according to the target output power, downshifting the heater; The method of controlling the heater to gradually increase the working gear according to the available power of the heater to heat the battery includes: determining a battery discharge capacity according to the battery discharge capacity signal; When the discharge capacity of the battery is less than a preset discharge capacity threshold, controlling the heater to gradually increase the working gear according to the available power of the heater to heat the battery; Calculating the heater available power according to the battery discharge capability signal, the battery charge capability signal, and the charging pile capability signal includes: Determining the battery charging capability and obtaining the DC power converter power according to the battery charging capability signal; When the battery charging capacity is 0, the available power of the heater is calculated according to a preset first power calculation algorithm, the battery discharge capacity signal, the power of the DC power converter, and the charging pile capacity signal; When the battery charging capacity is greater than 0, the available power of the heater is calculated according to a preset second power calculation algorithm, the power of the DC power converter and the charging pile capacity signal; The first power calculation algorithm is as follows: Heater available power = min {charging pile capacity - DCDC power, max (battery discharge capacity - DCDC consumption, heater minimum operating power), actual maximum heater power consumption}; The second power calculation algorithm is as follows: Heater available power = min{charging pile capacity - DCDC power, actual maximum power consumption of heater}.

2. The method for heating a power vehicle battery according to claim 1, characterized in that: After adjusting the target output power of the charging pile according to the battery charging capability signal, the method further includes: Obtain high-voltage accessory power consumption, power battery bus current, and power battery target line voltage; The actual output power of the charging pile is calculated according to the high-voltage accessory power, the power battery bus current and the power battery target line voltage.

3. The method for heating a power vehicle battery according to claim 1, characterized in that: After controlling the heater to gradually increase the operating gear according to the available power of the heater to heat the battery, the method further includes: During the battery heating process, obtaining the current actual output power of the charging pile and the current power consumption of the heater, and calculating the power sum of the battery charging capacity and the current power consumption; When the actual output power of the charging pile is 0 and the battery charging capacity is greater than the preset charging capacity threshold, the heating operation of the battery is actively exited; When the actual output power of the charging pile is 0 and the battery charging capacity is not greater than the preset charging capacity threshold, the available power of the first new heater is calculated according to a preset third power calculation algorithm, and the heater is controlled to heat the battery according to the available power of the first new heater; When the actual output power of the charging pile is continuously greater than 0 within a preset time period and the actual output power of the charging pile is less than the current power consumption, the second new heater available power is recalculated according to the actual output power of the charging pile and a preset fourth power calculation algorithm, and the operating gear of the heater is adjusted according to the second new heater available power; When the actual output power of the charging pile is greater than the power sum, a charging current request is generated according to a preset current adjustment algorithm to reduce the actual output power of the charging pile. The charging current request is used to reduce the charging current of the battery.

4. A power vehicle battery heating device, characterized in that: The power vehicle battery heating device comprises: an acquisition unit, configured to acquire a battery discharge capability signal, a battery charge capability signal, and a charging pile capability signal upon receiving a battery heating request signal; a calculation unit, configured to calculate the available power of the heater according to the battery discharge capability signal, the battery charge capability signal, and the charging pile capability signal; a control unit, configured to control the heater to gradually increase its operating gear according to the available power of the heater to heat the battery; an adjustment unit, configured to adjust a target output power of the charging pile according to the battery charging capability signal before the heater lowers its operating gear; a downshift unit, configured to downshift the heater after the charging pile completes adjustment of the actual output power according to the target output power; Wherein, the control unit includes: a second determining subunit, configured to determine the battery discharge capacity according to the battery discharge capacity signal; a control subunit, configured to control the heater to gradually increase its operating gear according to the available power of the heater when the discharge capacity of the battery is less than a preset discharge capacity threshold, so as to heat the battery; Wherein, the calculation unit includes: a first determining subunit, configured to determine the battery charging capability and obtain the DC power converter power according to the battery charging capability signal; a first calculation subunit, configured to calculate the heater available power based on a preset first power calculation algorithm, the battery discharge capacity signal, the DC power converter power, and the charging pile capacity signal when the battery charging capacity is zero; and to calculate the heater available power based on a preset second power calculation algorithm, the DC power converter power, and the charging pile capacity signal when the battery charging capacity is greater than zero; The first power calculation algorithm is as follows: Heater available power = min {charging pile capacity - DCDC power, max (battery discharge capacity - DCDC consumption, heater minimum operating power), actual maximum heater power consumption}; The second power calculation algorithm is as follows: Heater available power = min{charging pile capacity - DCDC power, actual maximum power consumption of heater}.

5. An electronic device, characterized in that: The electronic device includes a memory and a processor, the memory is used to store a computer program, and the processor runs the computer program to enable the electronic device to perform the power vehicle battery heating method according to any one of claims 1 to 3.

6. A readable storage medium, characterized in that: The readable storage medium stores computer program instructions, and when the computer program instructions are read and executed by a processor, the power vehicle battery heating method according to any one of claims 1 to 3 is executed.

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