WO2021197442A1

WO2021197442A1 - Control method for battery pack heating, motor controller and battery pack heating system

Info

Publication number: WO2021197442A1
Application number: PCT/CN2021/084999
Authority: WO
Inventors: 蒋哲; 董欣然; 熊亮; 高泽霖
Original assignee: 长城汽车股份有限公司
Priority date: 2020-04-02
Filing date: 2021-04-01
Publication date: 2021-10-07
Also published as: CN112659977A

Abstract

Provided are a control method for battery pack heating, a motor controller (320) and a battery pack heating system for use in the field of power batteries. The control method is applied to the motor controller (320) in a vehicle and comprises: receiving a first command sent by a vehicle controller (310) of the vehicle in response to a battery pack temperature value being less than a preset temperature threshold (S100), wherein the first command is used to instruct the motor controller (320) to enter a preset electric current mode; and entering the electric current mode in response to the first instruction, and controlling, in said electric current mode, the motor to output current to a battery pack by applying an electric current vector to the motor, so as to achieve battery pack heating (S200), the motor current being controlled by the motor controller (320) so as to achieve battery pack heating without adding other heating devices.

Description

Control method for heating battery pack, motor controller and battery pack heating system

Cross-references to related applications

The present disclosure requires the priority of a Chinese patent application filed with the Chinese Patent Office with an application number of 202010255850.1 and titled "Control method for battery pack heating, motor controller and battery pack heating system" on April 2, 2020, which The entire content is incorporated into this disclosure by reference.

Technical field

The present disclosure relates to the field of power batteries, and in particular to a control method for heating a battery pack, a motor controller, and a battery pack heating system.

Background technique

For most existing vehicles, especially pure electric vehicles, their driving relies on the vehicle battery pack (or called the power battery). However, the battery pack is susceptible to temperature and cannot operate normally, so it is often necessary to heat the battery pack.

The prior art involves two heating methods: one is to heat the battery pack using PTC (Positive Temperature Coefficient, which is referred to as a vehicle heater on the vehicle); the other is to use the vehicle motor to heat the battery pack, that is, the motor is blocked. The generated heat first heats the coolant, and then the coolant heats the battery pack. Among them, the first heating method requires additional PCT equipment, which greatly increases the cost; the second method not only accelerates the demagnetization of the permanent magnets of the motor, but also the heat is easily transferred to other places by the coolant, which makes the heating efficiency slow and the energy consumption biased. Big.

Therefore, after discovering the defects of the battery pack heating solution in the prior art, the present disclosure proposes a new battery pack heating solution.

Public content

In view of this, the present disclosure aims to propose a control method for battery pack heating to solve the problems of high cost and low efficiency of existing battery pack heating solutions.

In order to achieve the above objective, the technical solution of the present disclosure is achieved as follows:

A control method for heating a battery pack is applied to a motor controller of a vehicle, and the control method for heating a battery pack includes: receiving a vehicle controller of the vehicle in response to the battery pack temperature value being less than a preset temperature threshold The first instruction sent, wherein the first instruction is used to instruct the motor controller to enter a preset current mode; and in response to the first instruction to enter the current mode, in the current mode through the The motor applies a current vector to control the motor to output current to the battery pack, so as to achieve heating of the battery pack.

Further, the control method for heating the battery pack further includes: receiving a second instruction sent by the vehicle controller in response to the battery pack temperature value being equal to or greater than the preset temperature threshold, wherein the The second instruction is used to instruct the motor controller to exit the current mode; and in response to the second instruction to exit the current mode.

Further, the controlling the motor to output current to the battery pack includes: controlling the quadrature axis current of the motor to be zero and the direct axis current to a preset current value, and outputting a part of the direct axis current to the battery pack. The battery pack is used for heating the battery pack, wherein the preset current value is a non-zero value.

Further, the controlling the quadrature-axis current of the motor to be zero and the direct-axis current to a preset current value includes: controlling the switching frequency of a switching device provided between the motor controller and the motor The quadrature axis current of the motor is zero, and the direct axis current is adjusted to the preset current value.

Further, the applying a current vector to the motor includes: applying a positive current vector and a negative current vector to the motor in any two adjacent time periods, so that the direct-axis current is between the two Adjacent time periods form an oscillating waveform consistent with the direction of the corresponding current vector.

Compared with the prior art, the control method for battery pack heating described in the present disclosure has the following advantages: The solution of the present disclosure controls the motor current through the motor controller to realize the battery pack heating without adding other heating devices, thereby reducing the heating cost. , And the heating efficiency is high.

Another object of the present disclosure is to provide a machine-readable storage medium to solve the problems of high cost and low efficiency of existing battery pack heating solutions

A machine-readable storage medium has instructions stored on the machine-readable storage medium, and the instructions are used to make a machine execute the aforementioned control method for battery pack heating.

Another purpose of the present disclosure is to provide a motor controller for heating battery packs, so as to solve the problems of high cost and low efficiency of existing battery pack heating solutions

A motor controller for heating a battery pack is used to run a program, wherein the program is used to execute the above-mentioned control method for heating the battery pack when the program is run.

Another objective of the present disclosure is to provide a battery pack heating system to solve the problems of high cost and low efficiency of existing battery pack heating solutions

A battery pack heating system, the battery pack heating system includes: a vehicle controller, used to obtain a battery pack temperature value, and generate corresponding instructions according to the magnitude relationship between the battery pack temperature value and a preset temperature threshold, where when When the battery pack temperature value is smaller than the preset temperature threshold, a first instruction for instructing the motor controller to enter the preset current mode is generated; and the motor controller is configured to be used as described in claim 7 The motor controller that realizes the heating of the battery pack enters the current mode in response to the first instruction. In the current mode, the motor is controlled to output current to the battery pack by applying a current vector to the motor. Realize battery pack heating.

Further, the battery pack heating system further includes: a temperature detection device for detecting the temperature value of the battery pack and transmitting it to the vehicle controller.

Further, the battery pack heating system further includes a battery management system for obtaining the current output by the motor and distributing it to the battery pack.

The machine-readable storage medium, the motor controller for heating the battery pack, and the battery pack heating system have the same advantages over the prior art as the control method for heating the battery pack, which will not be repeated here.

Other features and advantages of the present disclosure will be described in detail in the following specific embodiments. The above description is only an overview of the technical solutions of the present disclosure. In order to understand the technical means of the present disclosure more clearly, they can be implemented in accordance with the content of the specification, and in order to make the above and other objectives, features and advantages of the present disclosure more obvious and easy to understand. In the following, specific embodiments of the present disclosure are specifically cited.

Description of the drawings

In order to more clearly describe the technical solutions in the embodiments of the present disclosure or related technologies, the following will briefly introduce the drawings that need to be used in the description of the embodiments or related technologies. Obviously, the drawings in the following description are of the present invention. For some of the disclosed embodiments, those of ordinary skill in the art can obtain other drawings based on these drawings without creative work.

Fig. 1 is a method for controlling heating of a battery pack according to an embodiment of the present disclosure;

Figure 2 is a motor vector control principle diagram of a permanent magnet synchronous motor as an example;

FIG. 3 is a schematic structural diagram of a battery pack heating system according to an embodiment of the present disclosure;

4 is a schematic diagram of the principle of the strategy of the motor controller to control the motor current to heat the battery pack in the example of the embodiment of the present disclosure; and

FIG. 5 is a schematic diagram of a process of heating a battery pack in an example of an embodiment of the present disclosure;

Fig. 6 schematically shows a block diagram of a computing processing device for executing the method according to the present disclosure; and

Fig. 7 schematically shows a storage unit for holding or carrying program codes for implementing the method according to the present disclosure.

Specific embodiment

In order to make the objectives, technical solutions, and advantages of the embodiments of the present disclosure clearer, the technical solutions in the embodiments of the present disclosure will be described clearly and completely in conjunction with the accompanying drawings in the embodiments of the present disclosure. Obviously, the described embodiments These are a part of the embodiments of the present disclosure, but not all of the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present disclosure.

It should be noted that the embodiments in the present disclosure and the features in the embodiments can be combined with each other if there is no conflict.

Hereinafter, the present disclosure will be described in detail with reference to the drawings and in conjunction with the embodiments.

FIG. 1 is a method for controlling the heating of a battery pack according to an embodiment of the present disclosure. The method is preferably applied to a motor control unit (MCU) of a vehicle. Wherein, the vehicle is, for example, a pure electric vehicle, and its built-in battery pack is the only power source for powering the vehicle. In addition, the motor may be a permanent magnet synchronous motor, and the motor can be collectively referred to as a motor system together with the MCU, and the motor system is operated by consuming the power of the battery pack.

On this basis, as shown in FIG. 1, the battery pack heating control method applied to the MCU in the embodiment of the present disclosure may include the following steps:

Step S100, receiving a first instruction sent by the vehicle controller of the vehicle in response to the battery pack temperature value being less than a preset temperature threshold.

Wherein, the first instruction is used to instruct the motor controller to enter a preset current mode. Wherein, the current mode is a preset state machine state. After the MCU enters the current mode, a series of subsequent operations are executed, for example, the following step S200 is executed. In addition, for example, the vehicle controller may obtain the battery pack temperature value from a temperature sensor provided in the battery pack, or obtain the battery pack temperature from a battery management system (Battery Management System, BMS) of the vehicle. The BMS uses a temperature sensor to obtain the battery pack temperature value.

Step S200, in response to the first instruction, enter the current mode, and in the current mode, the motor is controlled to output current to the battery pack by applying a current vector to the motor, so as to realize the battery pack heating.

In a preferred embodiment, for this step S200, the motor outputs a part of the current it generates to the battery pack, and the battery pack is heated by the internal resistance of the battery pack, and the other part of the current generated can be used for the motor. Heat generation, motor magnetization and internal electronic devices (such as built-in IGBT, Insulated Gate Bipolar Transistor, insulated gate bipolar transistor) loss and so on. Among them, the electric motor provides current to the battery pack can be referred to as the charging process of the battery pack, and the equipment such as the motor consumes the energy of the battery pack can be referred to as the discharging process of the battery pack. Therefore, in the process of step S200, the motor controller controls the motor current to charge and discharge the battery pack, thereby increasing the operating temperature of the battery pack.

In other embodiments, the applied voltage vector may be selected to replace the current vector here. However, the current change generated by the control of the alternating voltage will be faster, and the frequency of the current change will be more, which will produce a greater frequency of impact on the battery pack, making the phenomenon of lithium ionization in the battery pack serious and affecting the life of the battery pack.

Combining the above step S100-step S200, it can be seen that in the embodiment of the present disclosure, when the temperature of the battery pack is too low, the MCU applies a current vector to the motor to control the motor current to charge and discharge the battery pack, so as to achieve heating of the battery pack. Purpose.

In a preferred embodiment, in order to prevent excessive heating of the battery pack, the control method of the embodiment of the present disclosure further includes:

Step S300, receiving a second instruction sent by the vehicle controller of the vehicle in response to the battery pack temperature value being equal to or greater than the preset temperature threshold value.

Wherein, the second instruction is used to instruct the motor controller to exit the current mode. It is understandable that the preset temperature threshold may be determined according to the temperature value when the performance of the battery pack decreases.

Step S400, exit the current mode in response to the second instruction.

For this step S400, for example, after the motor controller exits the current mode, it immediately stops applying the current vector to the motor, so that the motor no longer provides current to the battery pack, so that the battery pack stops the charging process. Fully start to enter the discharging process of supplying power to the motor and other equipment, that is, the heating of the battery pack is completed.

In a preferred embodiment, for step S200, the controlling the motor to output current to the battery pack may include: controlling the quadrature axis current of the motor to zero and the direct axis current to a preset current value, and combining A part of the direct-axis current is output to the battery pack to heat the battery pack.

Wherein, the quadrature axis current is a zero value, and the direct axis current is a non-zero preset current value, both of which are concepts involved in motor vector control. The quadrature axis current is also called q-axis current and direct axis current Also known as d-axis current. Figure 2 is a motor vector control principle diagram of a permanent magnet synchronous motor as an example, which is provided in this application to more clearly illustrate the motor current control involved in the embodiments of the present disclosure, but the motor vector control principle diagram itself Those skilled in the art are conventional, so the working principle will not be described in detail. It is understandable that when the quadrature axis current is zero and the direct axis current is non-zero, it belongs to zero torque control of the motor. For example, if i _d represents the direct-axis current and i _q represents the quadrature-axis current, then i _q =0 and i _d ≠ 0 belong to zero torque control.

That is, in this preferred embodiment, the zero torque control for the motor is innovatively applied to the battery pack heating. However, it should be noted that it is impossible to completely control to zero torque in actual situations. Therefore, in step 200, it is preferable to add a current vector instead of a voltage vector. This is because, in the actual situation where it is impossible to completely control the zero torque, the alternating voltage will repeatedly generate positive and negative torque, which will accelerate the damage of the spline for the spline without motor connection.

In a more preferred embodiment, the controlling the quadrature axis current of the motor to be zero and the direct axis current to the preset current value may include: controlling a switch provided between the motor controller and the motor The switching frequency of the device is used to control the quadrature axis current of the motor to zero, and adjust the direct axis current to the preset current value.

For example, the switching device is an IGBT or a three-phase inverter such as shown in FIG. 2. When it is turned on, the motor controller applies a current vector to the motor to enter the charging state of the battery pack, and when it is turned off , The motor controller stops applying a current vector to the motor to enter the discharge state of the battery pack. In this process, by controlling the switching frequency of the IGBT, the magnitude of the current vector applied by the motor controller to the motor can be adjusted, thereby indirectly adjusting the value of the direct-axis current to reach the preset current value.

In a more preferred embodiment, the applying a current vector to the motor includes: applying a positive current vector and a negative current vector to the motor in any two adjacent time periods, so that the straight The shaft current forms an oscillating waveform consistent with the direction of the corresponding current vector in the two adjacent time periods.

For example, periodically apply a positive current vector and a negative current vector to the motor, so that i _{d is} _{expressed as i d} > 0 and i _d <0 in two adjacent periods, so that i _d has Positive and negative, forming an oscillating waveform. Among them, taking a permanent magnet synchronous motor as an example, i _d > 0 represents the motor magnetization, and i _d <0 represents the motor demagnetization, which can be described as the motor controller controlling the battery pack through the motor's magnetization/demagnetization control Perform shaking and heating. Accordingly, the embodiments of the present disclosure directly control i _d > 0 or i _d <0 to realize oscillating heating of the battery pack. Compared with the form of alternating current, the control scheme is more simplified and easy to implement.

Another embodiment of the present disclosure also provides a motor controller for heating the battery pack, which is used to run a program, where the program is used to execute the battery pack heating control described in the above embodiment when the program is run. method.

For details and effects of the motor controller for heating the battery pack, reference may be made to the above-mentioned embodiment of the control method for heating the battery pack, which will not be repeated here.

On this basis, another embodiment of the present disclosure provides a battery pack heating system for a vehicle. FIG. 3 is a schematic structural diagram of a battery pack heating system according to an embodiment of the present disclosure. As shown in FIG. 3, the battery pack heating system may include:

The vehicle controller 310 is configured to obtain the battery pack temperature value, and generate a corresponding instruction according to the magnitude relationship between the battery pack temperature value and a preset temperature threshold, wherein when the battery pack temperature value is smaller than the preset temperature threshold, it generates A first instruction for instructing the motor controller to enter the preset current mode;

The motor controller 320 is configured as the motor controller for heating the battery pack described in the above embodiment, so as to enter the current mode in response to the first instruction, and in the current mode, pass to the motor A current vector is applied to control the motor to output current to the battery pack to achieve heating of the battery pack.

Preferably, corresponding to the above steps S300 and S400, the vehicle controller 310 is further configured to generate a signal for instructing the motor controller to exit the current mode when the battery pack temperature value is equal to or greater than the preset temperature threshold. The second instruction. In addition, the motor controller 320 is also configured to exit the current mode in response to a second instruction.

Preferably, the battery pack heating system may further include: a temperature detection device 330 for detecting the temperature value of the battery pack and transmitting it to the vehicle controller 310. Wherein, the temperature detection device is, for example, a temperature sensor provided in conjunction with the battery pack, which can detect the temperature value of the battery pack in real time.

Preferably, the battery pack heating system may further include: a battery management system 340 for obtaining the current output by the motor and distributing it to the battery pack. That is, the size of the current output by the motor to the battery pack is managed by the battery management system (BMS), so as to more accurately control the heating power for the battery pack.

The following uses examples to specifically introduce the battery pack heating control method, the motor controller, and the strategy of the motor controller involved in the battery pack heating system in the battery pack heating system of the present disclosure to control the motor current to heat the battery pack. FIG. 4 is a schematic diagram of the principle of the strategy of the motor controller to control the motor current to heat the battery pack in the example of the embodiment of the present disclosure, and FIG. 5 is a schematic diagram of the process of heating the battery pack in the example of the embodiment of the present disclosure.

As shown in Figure 4, in this example, the principle of the strategy mainly includes: when the vehicle starts, the vehicle controller (Vehicle/Hybrid Control Unit, VCU/HCU) recognizes the battery pack temperature T detected by the internal temperature sensor of the battery pack, If the temperature T is lower than the battery pack heating start temperature T1 set for the whole vehicle, the VCU/HCU sends a command to the MCU. After receiving the command, the MCU enters the current mode and turns the IGBT (corresponding to the switching device involved in the previous embodiment) Adjust the switching frequency of) to K1, control i _q =0, and _{set the calibration value Z for i d} ; VCU/HCU continuously recognizes the temperature T of the temperature sensor in the battery pack. When the temperature T reaches the heating temperature T1 set by the vehicle, the VCU /HCU sends a heating stop command to the MCU, the MCU stops outputting current to the motor, and the heating is terminated.

Referring to Figure 5, combined with the parameters involved in Figure 4, a more specific process mainly includes the following steps:

In step S510, the VCU/HCU monitors whether the battery pack temperature T is less than T1, if yes, execute step S520, otherwise continue to monitor the temperature.

In step S520, the VCU/HCU detects whether the entire vehicle is in a high-voltage state, and if so, execute step S530, otherwise, it returns to continue monitoring the temperature.

Among them, for the IGBT, the high-voltage state of the vehicle is a necessary condition for its work, and it is also a necessary condition for the battery pack relay to close.

In step S530, the VCU/HCU detects whether the motor speed is zero, and if so, executes step S540, otherwise, it returns to continue monitoring the temperature.

In step S540, the VCU/HCU sends a heating request command to the MCU.

Wherein, the heating request instruction corresponds to the first instruction in step S100.

In step S550, the MCU controls the IGBT switching frequency to K1.

Among them, for the consideration of energy saving and battery protection, the switching frequency K of the IGBT in normal operation is different from the switching frequency K1 of the oscillating heating in the embodiment of the present disclosure.

In step S560, the MCU controls i _q =0 and i _d =Z.

Among them, the value of Z determines the size of the corresponding charge and discharge current of the battery pack when the motor oscillates and heats the battery pack, which needs to be determined according to the charge and discharge MAP and heating time of the battery pack.

In step S570, it is determined whether the battery pack temperature T is greater than or equal to T1, if yes, step S580 is executed, otherwise, step S540 is executed.

In step S580, i _d =0 is controlled, and the IGBT switching frequency is restored to K.

In combination with the above steps, it can be seen that the strategy of heating the battery pack by the motor controller of the embodiment of the present disclosure realizes that the battery pack can be oscillated and heated under the static high pressure state when the vehicle is started in a low temperature environment, thereby improving the working condition of the battery pack. The discharge efficiency of the battery pack is improved, and this process can realize heating of the battery pack without adding other electric devices such as PTC, which reduces the heating cost and has high heating efficiency.

Another embodiment of the present disclosure further provides a machine-readable storage medium having instructions stored on the machine-readable storage medium, and the instructions are used to make a machine execute the method for controlling the heating of the battery pack described in the foregoing embodiment.

Those skilled in the art should understand that the embodiments of the present application can be provided as methods, systems, or computer program products. Therefore, this application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, this application may adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program codes.

This application is described with reference to flowcharts and/or block diagrams of methods, devices (systems), and computer program products according to embodiments of this application. It should be understood that each process and/or block in the flowchart and/or block diagram, and the combination of processes and/or blocks in the flowchart and/or block diagram can be realized by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing equipment to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing equipment are used to generate It is a device that realizes the functions specified in one process or multiple processes in the flowchart and/or one block or multiple blocks in the block diagram.

These computer program instructions can also be stored in a computer-readable memory that can guide a computer or other programmable data processing equipment to work in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture including the instruction device. The device implements the functions specified in one process or multiple processes in the flowchart and/or one block or multiple blocks in the block diagram.

These computer program instructions can also be loaded on a computer or other programmable data processing equipment, so that a series of operation steps are executed on the computer or other programmable equipment to produce computer-implemented processing, so as to execute on the computer or other programmable equipment. The instructions provide steps for implementing the functions specified in one process or multiple processes in the flowchart and/or one block or multiple blocks in the block diagram.

In a typical configuration, the computing device includes one or more processors (CPUs), input/output interfaces, network interfaces, and memory.

The memory may include non-permanent memory in a computer-readable medium, random access memory (RAM) and/or non-volatile memory, such as read-only memory (ROM) or flash memory (flash RAM). The memory is an example of a computer-readable medium.

Computer-readable media includes permanent and non-permanent, removable and non-removable media, and information storage can be realized by any method or technology. The information can be computer readable instructions, data structures, program modules, or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, CD-ROM, digital versatile disc (DVD) or other optical storage, Magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices or any other non-transmission media can be used to store information that can be accessed by computing devices. According to the definition in this article, computer-readable media does not include transitory media, such as modulated data signals and carrier waves.

The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in One place, or it can be distributed to multiple network units. Some or all of the modules may be selected according to actual needs to achieve the objectives of the solutions of the embodiments. Those of ordinary skill in the art can understand and implement it without creative work.

The various component embodiments of the present disclosure may be implemented by hardware, or by software modules running on one or more processors, or by a combination of them. Those skilled in the art should understand that a microprocessor or a digital signal processor (DSP) may be used in practice to implement some or all of the functions of some or all of the components in the computing processing device according to the embodiments of the present disclosure. The present disclosure can also be implemented as a device or device program (for example, a computer program and a computer program product) for executing part or all of the methods described herein. Such a program for realizing the present disclosure may be stored on a computer-readable medium, or may have the form of one or more signals. Such a signal can be downloaded from an Internet website, or provided on a carrier signal, or provided in any other form.

For example, FIG. 6 shows a computing processing device that can implement the method according to the present disclosure. The computing processing device traditionally includes a processor 1010 and a computer program product in the form of a memory 1020 or a computer readable medium. The memory 1020 may be an electronic memory such as flash memory, EEPROM (Electrically Erasable Programmable Read Only Memory), EPROM, hard disk, or ROM. The memory 1020 has a storage space 1030 for executing program codes 1031 of any method steps in the above methods. For example, the storage space 1030 for program codes may include various program codes 1031 respectively used to implement various steps in the above method. These program codes can be read from or written into one or more computer program products. These computer program products include program code carriers such as hard disks, compact disks (CDs), memory cards, or floppy disks. Such a computer program product is usually a portable or fixed storage unit as described with reference to FIG. 7. The storage unit may have storage segments, storage spaces, etc., arranged similarly to the memory 1020 in the computing processing device of FIG. 6. The program code can be compressed in an appropriate form, for example. Generally, the storage unit includes computer-readable code 1031', that is, code that can be read by a processor such as 1010, which, when run by a computing processing device, causes the computing processing device to execute the method described above. The various steps.

The “one embodiment”, “an embodiment” or “one or more embodiments” referred to herein means that a specific feature, structure or characteristic described in conjunction with the embodiment is included in at least one embodiment of the present disclosure. In addition, please note that the word examples "in one embodiment" here do not necessarily all refer to the same embodiment.

In the instructions provided here, a lot of specific details are explained. However, it can be understood that the embodiments of the present disclosure may be practiced without these specific details. In some instances, well-known methods, structures, and technologies are not shown in detail, so as not to obscure the understanding of this specification.

In the claims, any reference signs placed between parentheses should not be constructed as a limitation to the claims. The word "comprising" does not exclude the presence of elements or steps not listed in the claims. The word "a" or "an" preceding an element does not exclude the presence of multiple such elements. The present disclosure can be realized by means of hardware including several different elements and by means of a suitably programmed computer. In the unit claims listing several devices, several of these devices may be embodied in the same hardware item. The use of the words first, second, and third, etc. do not indicate any order. These words can be interpreted as names.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present disclosure, but not to limit them; although the present disclosure has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: The technical solutions recorded in the foregoing embodiments are modified, or some of the technical features thereof are equivalently replaced; these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present disclosure.

Claims

A control method for heating a battery pack is characterized in that it is applied to a motor controller of a vehicle, and the control method for heating a battery pack includes:

Receiving the first instruction sent by the vehicle controller of the vehicle in response to the battery pack temperature value being less than the preset temperature threshold, where the first instruction is used to instruct the motor controller to enter the preset current mode; and

In response to the first instruction, the current mode is entered, and in the current mode, a current vector is applied to the motor to control the motor to output current to the battery pack, so as to realize the battery pack heating.
The control method for heating the battery pack according to claim 1, wherein the control method for heating the battery pack further comprises:

Receiving a second instruction sent by the vehicle controller in response to the battery pack temperature value being equal to or greater than the preset temperature threshold, wherein the second instruction is used to instruct the motor controller to exit the current mode ;as well as

The current mode is exited in response to the second instruction.
The control method for heating a battery pack according to claim 1, wherein the controlling the motor to output current to the battery pack comprises:

The quadrature axis current of the motor is controlled to be zero and the direct axis current is a preset current value, and a part of the direct axis current is output to the battery pack for battery pack heating, wherein the preset current value is not Zero value.
The control method for heating a battery pack according to claim 3, wherein the controlling the quadrature axis current of the motor to be zero and the direct axis current to a preset current value comprises:

By controlling the switching frequency of the switching device provided between the motor controller and the motor, the quadrature axis current of the motor is controlled to zero, and the direct axis current is adjusted to the preset current value.
The control method for heating a battery pack according to claim 3, wherein the applying a current vector to the motor comprises:

In any two adjacent time periods, a positive current vector and a negative current vector are respectively applied to the motor, so that the direct-axis current oscillates in the same direction as the corresponding current vector in the two adjacent time periods Waveform.
A machine-readable storage medium having instructions stored on the machine-readable storage medium for causing a machine to execute the control method for battery pack heating according to any one of claims 1-5.
A motor controller for battery pack heating, characterized in that it is used to run a program, wherein the program is used for execution when it is running: the battery pack heating as claimed in any one of claims 1-5的控制方法。 Control methods.
A battery pack heating system, characterized in that the battery pack heating system includes:

The vehicle controller is used to obtain the battery pack temperature value, and generate corresponding instructions according to the magnitude relationship between the battery pack temperature value and the preset temperature threshold, wherein when the battery pack temperature value is smaller than the preset temperature threshold, the At the first instruction instructing the motor controller to enter the preset current mode; and

The motor controller is configured as the motor controller for heating battery packs according to claim 7, so as to enter the current mode in response to the first instruction, and pass to the current mode in the current mode. The motor applies a current vector to control the motor to output current to the battery pack, so as to realize the battery pack heating.
The battery pack heating system according to claim 8, wherein the battery pack heating system further comprises:

The temperature detection device is used to detect the temperature value of the battery pack and transmit it to the vehicle controller.
The battery pack heating system according to claim 8, wherein the battery pack heating system further comprises:

The battery management system is used to obtain the current output by the motor and distribute it to the battery pack.
A computing processing device, characterized in that it comprises:

A memory in which computer readable codes are stored; and

One or more processors, when the computer-readable code is executed by the one or more processors, the computing processing device executes the battery pack heating device according to any one of claims 1-5 Control Method.
A computer program, comprising computer readable code, when the computer readable code runs on a computing processing device, causing the computing processing device to execute the battery pack heating device according to any one of claims 1-5的控制方法。 Control methods.