A method and device for heating a battery of a vehicle, a vehicle and an electronic device

Abstract

Embodiments of the present application provide a heating method and device for an automobile battery, an automobile and an electronic device, wherein the method comprises: obtaining state information of the automobile battery; disconnecting a connection between a wheel of the automobile and a motor according to the state information of the automobile battery; driving the disconnected motor to reach a working speed of the motor; and controlling a fluctuation of the working speed of the motor to cause a fluctuation of kinetic energy of a rotor, so that the automobile battery is charged and discharged to generate an alternating current for heating. The embodiments of the present application improve the heating capacity of the automobile battery, avoid heating and noise problems, and reduce costs.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of automobile battery, in particular to a heating method and device of automobile battery, an automobile and an electronic device. BACKGROUND

[0002] The power battery of a new energy automobile has poor low-temperature performance, and thus the temperature of the battery needs to be increased at low temperature. In existing battery AC heating technology, a motor controller is generally used to charge and store energy in the stator winding of a drive motor, and then discharge and release the energy. However, since the motor inductance energy storage is small, the charging and discharging must be performed to generate a large enough AC current. The DC bus capacitor of the inverter bypasses and absorbs the AC current at high frequency, thereby reducing the current flowing into the battery. Most of the current can only oscillate between the DC bus capacitor and the motor, and the AC current flowing into the battery is very small, which limits the heating power of the automobile battery. In addition, the electric drive system generates a lot of heat, and the current with a high frequency generates sharp noise, which affects the driving experience. SUMMARY

[0003] The purpose of the embodiments of the present application is to provide a heating method and device of automobile battery, an automobile and an electronic device, to improve the heating capacity of the automobile battery, avoid the problems of heat generation and noise, and reduce the cost.

[0004] In a first aspect, the embodiments of the present application provide a heating method of automobile battery, which comprises the following steps.

[0005] Obtaining state information of the automobile battery;

[0006] Disconnecting the connection between the wheels of the automobile and the motor according to the state information of the automobile battery;

[0007] Driving the disconnected motor to make the rotating speed of the motor reach a working rotating speed;

[0008] Controlling the rotating speed fluctuation of the motor reaching the working rotating speed, so as to cause the fluctuation of the rotor kinetic energy, so that the automobile battery is charged and discharged to generate an AC current for heating.

[0009] In the above implementation process, the disconnected motor is driven by disconnecting the connection between the motor and the wheels of the automobile, so that the battery is repeatedly charged and discharged with a large current to heat the automobile battery. No additional cost is needed to heat the automobile battery, and the low-temperature performance of the battery is improved.

[0010] Further, the step of controlling the rotating speed fluctuation of the motor reaching the working rotating speed comprises:

[0011] Obtaining a heating requirement;

[0012] The motor speed fluctuation reaching the working speed is controlled according to the heating demand.

[0013] In the implementation process, the motor rotor mechanical energy fluctuation is generated by controlling the motor speed fluctuation reaching the working speed according to the heating demand, so as to repeatedly charge and discharge the battery, thereby heating the battery.

[0014] In the second aspect, the embodiment of the application further provides a heating device for an automobile battery, which comprises:

[0015] An acquisition module is configured to acquire state information of the automobile battery.

[0016] A disconnecting module is configured to disconnect the connection between the wheels of the automobile and the motor according to the state information of the automobile battery.

[0017] A driving module is configured to drive the disconnected motor to reach a working speed.

[0018] A heating control module is configured to control the motor speed fluctuation reaching the working speed, so as to cause the rotor kinetic energy fluctuation, so that the automobile battery is charged and discharged to generate alternating current for heating.

[0019] In the implementation process, the battery is repeatedly charged and discharged with large current by disconnecting the connection between the motor and the wheels of the automobile, so that the automobile battery is heated without additional cost, the low-temperature performance of the battery is improved, and the automobile battery is heated.

[0020] Further, the heating control module is further configured to:

[0021] acquire a heating demand;

[0022] The motor speed fluctuation reaching the working speed is controlled according to the heating demand.

[0023] In the implementation process, the motor speed fluctuation reaching the working speed is controlled according to the heating demand, which does not interfere with other high-voltage electrical components of the vehicle, does not cause the motor to overheat, improves the heating efficiency of the automobile battery, and shortens the heating time.

[0024] In the third aspect, the embodiment of the application provides an electronic device, which comprises a memory, a processor, and a computer program stored in the memory and capable of running on the processor, and the processor implements the steps of the method according to any one of the first aspect when executing the computer program.

[0025] In a fourth aspect, a computer readable storage medium is provided. The storage medium stores instructions which, when executed on a computer, cause the computer to perform the method of any of the first aspect.

[0026] In a fifth aspect, a computer program product is provided. The computer program product, when executed on a computer, causes the computer to perform the method of any of the first aspect.

[0027] Other features and advantages of the present disclosure will be set forth in the following description, in part will be apparent from the description, or can be learned by practice of the present disclosure. Other features and advantages of the present disclosure will be realized and attained by the structure particularly pointed out in the description below.

[0028] The above and other aspects of the present disclosure will become more apparent by describing in detail the embodiments thereof with reference to the attached drawings. BRIEF DESCRIPTION OF DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments of the present application. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0030] Figure 1 A flowchart of the heating method of the automobile battery provided by the embodiments of the present application is shown in the figure.

[0031] Figure 2 A schematic diagram of the relationship between the capacity and the speed of the motor output power provided by the embodiments of the present application is shown in the figure.

[0032] Figure 3 A schematic diagram of the speed waveform of the motor provided by the embodiments of the present application is shown in the figure.

[0033] Figure 4 A schematic diagram of the structure of the heating device of the automobile battery provided by the embodiments of the present application is shown in the figure.

[0034] Figure 5 A schematic diagram of the structure of the electronic device provided by the embodiments of the present application is shown in the figure. DETAILED DESCRIPTION

[0035] The technical solutions of the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application.

[0036] It should be noted that similar reference numerals and letters refer to like items throughout the drawings, and once an item is defined in one drawing, it is not necessary to further define and explain it in subsequent drawings. Meanwhile, in the description of the present application, the terms "first", "second", and the like are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0037] The specific embodiments of the present application will be further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present application, but not to limit the scope of the present application.

[0038] Example one

[0039] Figure 1 is a flowchart of a heating method of an automobile battery provided by the embodiments of the present application, as shown in the figure, the method comprises: Figure 1

[0040] S1, obtaining state information of the automobile battery;

[0041] S2, disconnecting the connection between the wheels of the automobile and the motor according to the state information of the automobile battery;

[0042] S3, driving the disconnected motor to make the rotating speed of the motor reach the working rotating speed;

[0043] S4, controlling the rotating speed fluctuation of the motor reaching the working rotating speed, so as to cause the fluctuation of the rotor kinetic energy, so that the automobile battery is charged and discharged to generate alternating current for heating.

[0044] In the above implementation process, by disconnecting the connection between the automobile motor and the wheels, the disconnected motor is driven to make the battery repeatedly charge and discharge large current to heat the automobile battery, without increasing additional cost, so as to heat the automobile battery and improve the low temperature performance of the battery.

[0045] Further, the step of controlling the rotating speed fluctuation of the motor reaching the working rotating speed comprises:

[0046] obtaining the heating demand;

[0047] controlling the rotating speed fluctuation of the motor reaching the working rotating speed according to the heating demand.

[0048] In the above implementation process, the rotating speed fluctuation of the motor reaching the working rotating speed is controlled according to the heating demand, which will not interfere with other high-voltage electrical components, and will not cause the motor to overheat, so as to improve the efficiency of heating the automobile battery and shorten the heating time.

[0049] In the embodiments of the present application, the motor is controlled to rotate to a certain working rotating speed, which can generate a large enough charge and discharge current (heating current).​

[0050] The relationship between the output power capability and the rotation speed of a general motor is shown in the figure as the "power upper limit" and "power lower limit". The elliptical trajectory in the figure represents the "input power-rotation speed" trajectory of the motor itself in the charging and discharging state. Figure 2

[0051] At each moment, the battery current I bat (t) = P m (t) / U dc , where P m is the instantaneous input power of the motor, and U dc is the DC voltage (basically equal to the battery voltage).

[0052] Referring to the relationship between the motor power limit and the rotation speed, it can be known that if the working rotation speed of the motor is low, it cannot generate a large enough heating current; the higher the rotation speed, the greater the motor itself loss, and the greater the stress on the bearings and other components, and the greater the risk of motor vibration and noise problems. Therefore, in general, a relatively low working rotation speed is preferred to meet the battery heating requirements.

[0053] The width of the elliptical trajectory reflects the strength of the rotation speed fluctuation, which is related to the frequency of the rotation speed fluctuation: the lower the frequency, the greater the range of rotation speed fluctuation. If the frequency of the motor heating current requirement is low, a higher working rotation speed is required, otherwise the working trajectory may exceed the power limit, i.e. cannot meet the battery heating current requirement.

[0054] As shown in Figure 3 , it is a schematic diagram of the rotation speed waveform of the motor rotation speed fluctuation.

[0055] Exemplarily, the kinetic energy can be converted into heat energy by using an inverter. Taking a permanent magnet synchronous motor of a certain car as an example, referring to the D-axis inductance of 120uH and the maximum allowable current of 700A, the battery self-heating of the car generally injects current on the D-axis, so the energy storage upper limit of the motor can be calculated as:

[0056]

[0057] The motor moment of inertia is J m = 0.04 kg*m 2 , and the maximum rotation speed of the motor is 15000 rpm. The relationship between the rotation kinetic energy and the rotation speed is as follows:

[0058]

[0059] ​It can be seen that the mechanical energy storage capacity of the motor rotor is much higher than the electromagnetic energy storage capacity of the motor winding, so the rotor mechanical energy storage can realize low frequency and large power energy charging and discharging cycle, so as to realize the low frequency and large current cycle charging and discharging of the battery, and realize the heating of the battery.

[0060] Suppose the moment of inertia of the motor rotor and the gear rotating with the motor is J m When the motor charges and discharges, the average speed is ω0, and since the motor is almost unloaded, the average torque is zero. Assuming that the bus current varies in a square wave, the amplitude is I0, and the frequency is f ac , then the motor speed fluctuation is basically a triangular wave, and the approximate calculation can obtain the amplitude of the triangular wave:

[0061]

[0062] The relative speed fluctuation is:

[0063]

[0064] The torque is approximately a rectangular wave with the same frequency and amplitude as I0:

[0065]

[0066] Taking a four-pole motor with a rated torque of 200Nm as an example, J m = 0.04 kg*m 2 , the speed is ω avg = 2π*100 rad / s, f ac = 100 Hz, I0 = 300 A, and U bat = 400 V, the speed fluctuation is only 1.9%, and the torque fluctuation amplitude is 191 Nm. At this time, the motor winding current is about 270 A effective value.

[0067] As can be seen, the motor winding flows low frequency current, and the motor torque is not much different from the rated torque, so the entire electric drive has no risk of overheating.

[0068] In theory, the battery internal resistance does not affect the operation of the motor according to the heating requirements, so the heating method is very strong in resisting the increase of the battery internal resistance. When the battery internal resistance is large at low temperature, it can still generate a large heating power. For example, when the battery internal resistance reaches 0.5Ω, it can still flow a current of 300A effective value, generating a heating power of 45kW.

[0069] Under the heating condition, the alternating frequency of the battery heating current is only about 100Hz, so the noise of the entire electric drive system is small at this time.

[0070] In the above embodiment, the battery heating current is a rectangular wave. In fact, it can also be various alternating waveforms such as a sine wave. The frequency of the alternating current for battery heating can be selected in a range much lower than 100 Hz or much higher than 100 Hz, such as 20 Hz or 5000 Hz. The average motor speed can be any value in a range from zero to the highest motor speed.

[0071] The method of the embodiment of the present application can heat the automobile battery at low temperature without generating excessive noise, and the user experience is better.

[0072] Embodiment Two

[0073] In order to perform the method corresponding to the above embodiment one, to realize the corresponding function and technical effect, the following provides a heating device for automobile battery, as shown in Figure 4 The device comprises:

[0074] The acquisition module 1 is configured to acquire state information of the automobile battery.

[0075] The disconnection module 2 is configured to disconnect the connection between the wheels of the automobile and the motor according to the state information of the automobile battery.

[0076] The driving module 3 is configured to drive the disconnected motor to make the speed of the motor reach a working speed.

[0077] The heating control module 4 is configured to control the fluctuation of the speed of the motor reaching the working speed, so as to cause the fluctuation of the rotor kinetic energy, so that the automobile battery is charged and discharged to generate alternating current for heating.

[0078] In the above implementation process, by disconnecting the connection between the motor of the automobile and the wheels, the disconnected motor is driven to make the battery repeatedly charge and discharge large current to heat the automobile battery, without increasing additional cost, so that the heating of the automobile battery is realized, and the low temperature performance of the battery is improved.

[0079] Further, the heating control module 4 is further configured to:

[0080] Obtain a heating requirement;

[0081] Control the fluctuation of the speed of the motor reaching the working speed according to the heating requirement.

[0082] In the above implementation process, the fluctuation of the speed of the motor reaching the working speed is controlled according to the heating requirement, which does not interfere with other high-voltage electrical components, and does not cause overheating of the motor, so that the efficiency of heating the automobile battery can be improved, and the heating time can be shortened.

[0083] The heating device of the automobile battery described above can implement the method of the first embodiment described above. The optional items in the first embodiment described above also apply to this embodiment, which will not be described in detail here.

[0084] The remaining content of the embodiment of the present application can refer to the content of the first embodiment described above. In this embodiment, no further description will be given.

[0085] Embodiment three

[0086] The electronic device provided in the embodiments of the present application includes a memory and a processor. The memory is used to store a computer program. The processor runs the computer program to enable the electronic device to execute the heating method of the automobile battery of the first embodiment.

[0087] Optionally, the electronic device described above can be a server.

[0088] Please refer to Figure 5 , Figure 5 The structural composition schematic diagram of the electronic device provided in the embodiments of the present application is shown in FIG. 1. The electronic device can include a processor 51, a communication interface 52, a memory 53 and at least one communication bus 54. The communication bus 54 is used to realize the direct connection communication of these components. The communication interface 52 of the device in the embodiments of the present application is used to communicate with other node devices. The processor 51 can be an integrated circuit chip with signal processing capability.

[0089] The processor 51 described above can be a general-purpose processor, including a central processing unit (CPU), a network processor (NP) and the like; it can also be a digital signal processor (DSP), an application specific integrated circuit (ASIC), a ready programmable gate array (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components. It can implement or execute the disclosed methods, steps and logic block diagrams in the embodiments of the present application. The general-purpose processor can be a microprocessor or the processor 51 can also be any conventional processor or the like.

[0090] The memory 53 can be, but is not limited to, a random access memory (RAM), 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), etc. The memory 53 stores computer readable instructions, which, when executed by the processor 51, enable the device to perform the above Figure 1 The method embodiments relate to each step.

[0091] Optionally, the electronic device can further include a storage controller, an input / output unit. The memory 53, the storage controller, the processor 51, the peripheral interface, and the input / output unit are electrically connected to each other directly or indirectly to realize data transmission or interaction. For example, these elements can be electrically connected to each other through one or more communication buses 54. The processor 51 is configured to execute executable modules stored in the memory 53, such as software function modules or computer programs included in the device.

[0092] The input / output unit is configured to provide a user with a creation task and create a selectable time period or a preset execution time for the task to realize interaction between the user and the server. The input / output unit can be, but is not limited to, a mouse, a keyboard, etc.

[0093] It can be understood that Figure 5 The structure shown is only schematic, and the electronic device can further include more or fewer components than those shown in the figures, or have a different configuration from that shown in the figures. Figure 5 Each component shown in the figures can be implemented in hardware, software, or a combination thereof. Figure 5 Figure 5 It can be understood that

[0094] In addition, the embodiment of the present application further provides a computer readable storage medium, which stores a computer program, and the computer program is executed by a processor to implement the heating method of the automobile battery in the embodiment one.

[0095] The embodiment of the present application further provides a computer program product, which, when running on a computer, enables the computer to execute the method described in the method embodiment.

[0096] ​In several embodiments provided in the present application, it should be understood that the disclosed apparatus and method can also be implemented by other manners. The apparatus embodiments described above are merely illustrative, for example, the flowcharts and block diagrams in the drawings show the possible implementation architecture, function and operation of the apparatus, method and computer program product according to the embodiments of the present application. In this regard, each block in the flowchart or block diagram can represent a module, a program segment or a part of code, which contains one or more executable instructions for implementing the specified logic function. It should also be noted that in some alternative implementation manners, the functions noted in the blocks can also occur in different order from that noted in the drawings. For example, two consecutive blocks can actually be executed substantially in parallel, and sometimes they can also be executed in reverse order, depending on the functions involved. It should also be noted that each block in the block diagram and / or flowchart, and the combination of blocks in the block diagram and / or flowchart, can be implemented by a dedicated hardware-based apparatus performing the specified function or action, or can be implemented by a combination of special-purpose hardware and computer instructions.

[0097] In addition, the function modules in the embodiments 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.

[0098] 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 such understanding, the technical solutions of the present application can be embodied in the form of a software product, and the computer software product is stored in a storage medium, and includes a number of instructions for causing 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 methods described in the embodiments of the present application. The foregoing storage medium includes: a U disk, a mobile hard disk, a ROM, a RAM, a magnetic disk or an optical disk, and various program code storage media.

[0099] The above only describes the embodiments of the present application and does not limit the protection scope of the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0100] The above description is only the specific implementation of this application, but the protection scope of this application is not limited to this, any person skilled in the art can easily think of changes or replacements within the technical range disclosed by this application, which should be covered within the protection scope of this application. Therefore, the protection scope of this application should be limited by the protection scope of the claims.

[0101] It should be noted that the relative terms, such as first and second, and the like, are used herein only to distinguish one entity or action from another, and do not necessarily require or imply any actual such relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can also include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by an "includes a..." statement does not exclude the existence of additional identical elements in the process, method, article, or apparatus that includes the element.

Claims

1. A method for heating an automotive battery, characterized in that, The method includes: Obtain the status information of the car battery; Disconnect the connection between the car's wheels and the motor based on the status information of the car battery; Drive the disconnected motor to bring its speed up to the operating speed; The motor speed fluctuation is controlled to reach the operating speed, thereby causing the rotor kinetic energy fluctuation, so that the car battery can be charged and discharged, generating alternating current for heating; The steps for controlling the motor speed fluctuation to reach the operating speed include: Obtain heating requirements; The motor speed fluctuation is controlled to reach the operating speed according to the heating requirements; The motor windings carry a low-frequency current below 100Hz, and under heating conditions, the battery heating current is a rectangular wave.

2. A heating device for an automobile battery, characterized in that, The device includes: The acquisition module is used to acquire the status information of the car battery; The disconnect module is used to disconnect the connection between the car's wheels and the motor based on the status information of the car battery. The drive module is used to drive the disconnected motor so that the motor reaches the operating speed. The heating control module is used to control the fluctuation of the motor speed when it reaches the working speed, thereby causing the rotor kinetic energy to fluctuate, so as to charge and discharge the car battery and generate alternating current for heating. The heating control module is also used for: Obtain heating requirements; The motor speed fluctuation is controlled to reach the operating speed according to the heating requirements; The motor windings carry a low-frequency current below 100Hz, and under heating conditions, the battery heating current is a rectangular wave.

3. A car, characterized in that, Including the heating device for the automotive battery as described in claim 2.

4. An electronic device, characterized in that, The device includes a memory and a processor, the memory being used to store a computer program, and the processor running the computer program to cause the electronic device to perform the heating method for an automotive battery according to claim 1.

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