Battery energy recovery method, apparatus, battery management system, and battery

Abstract

This application relates to the field of battery technology, and discloses a battery energy recovery method, device, battery management system, and battery. The method includes sending a charge / discharge command to a battery pack, making the battery pack output a charge signal and a discharge signal alternately during vehicle running according to the charge / discharge command, and recovering battery energy of the vehicle according to the charge signal. The battery energy recovery method, device, battery management system, and battery of this application alternately output a charge signal and a discharge signal, and recover battery energy when corresponding to the charge signal, thereby effectively improving the driving range of the vehicle and reducing the decay rate of the battery.

Description

Technical Field

[0001] This application relates to the field of battery technology, and particularly relates to a battery energy recovery method, device, battery management system, and battery.

[0002] (Cross-reference to related applications) This application claims the priority of Chinese Patent Application No. 202210044608.9, titled "Battery Energy Recovery Method, Device, Battery Management System, and Battery", filed on January 14, 2022, and the entire content of this application is incorporated herein by reference.

Background Art

[0003] Currently, electric vehicles activate an energy recovery policy during braking and perform battery energy recovery by calculating the maximum charging capacity of energy recovery according to the braking condition and the battery pack state. Such a current battery energy recovery policy requires a braking signal and maximally utilizes the charging capacity of the battery.

[0004] In related technologies, there is a risk of accelerating the attenuation of the battery by performing energy recovery in a state close to the maximum capacity of the battery over a long period.

Summary of the Invention

[0005] Embodiments of this application at least partially improve the above problems, effectively perform battery energy recovery, and reduce the attenuation rate of the battery.

[0006] To solve the above technical problems, one technical solution adopted by the embodiments of this application is as follows. In the first aspect, the embodiment of this application provides a battery energy recovery method. The method includes transmitting a charge / discharge command to a battery pack, causing the battery pack to alternately output a charge signal and a discharge signal while the vehicle is running based on the charge / discharge command, and recovering battery energy from the vehicle based on the charge signal. The embodiment of this application can not only effectively improve the driving range of an electric vehicle but also reduce the rate of battery decay by alternately outputting a charge signal and a discharge signal and recovering battery energy when a charge signal is received.

[0007] In some embodiments, the method described above, of transmitting a charge / discharge command to a battery pack and causing the battery pack to alternately output a charge signal and a discharge signal while the vehicle is running based on the charge / discharge command, includes transmitting a pulse charge / discharge command to the battery pack and causing the battery pack to alternately output a pulse charge signal and a pulse discharge signal while the vehicle is running based on the pulse charge / discharge command, and the method described above, of recovering battery energy from the vehicle based on the charge signal, includes recovering battery energy from the vehicle based on the pulse charge signal. Among these, the method of charging or discharging in stages with pulses of different magnifications can effectively eliminate cumulative polarization during the continuous charge / discharge process of the battery, improve pulse charging capability, extend the battery's lifespan, and improve energy recovery efficiency.

[0008] In some embodiments, the process of transmitting a pulse charge / discharge command to a battery pack and causing the battery pack to alternately output a pulse charge signal and a pulse discharge signal while the vehicle is running, as described above, includes acquiring speed information while the vehicle is running, transmitting a pulse charge / discharge command to the battery pack based on the speed information, and causing the battery pack to alternately output a pulse charge signal and a pulse discharge signal based on the speed information. In this case, the output status of the pulse charge signal and pulse discharge signal may be determined based on the vehicle's running speed. This not only enables the recovery of battery energy and reduces battery decay, but also allows the vehicle's current electrical energy consumption to be matched to the vehicle's running state, thereby improving vehicle performance and ensuring a good driving experience for the user.

[0009] In some embodiments, the method of having the battery pack alternately output a pulse charging signal and a pulse discharging signal based on the speed information described above includes controlling the discharge power of the pulse discharging signal output by the battery pack to be greater than the charging power of the pulse charging signal when the speed information indicates that the vehicle is accelerating; controlling the discharge power of the pulse discharging signal output by the battery pack to be less than the charging power of the pulse charging signal when the speed information indicates that the vehicle is decelerating; and controlling the discharge power of the pulse discharging signal output by the battery pack to be equal to the charging power of the pulse charging signal when the speed information indicates that the vehicle is at a constant speed. The embodiments of this application can recover battery energy in all states of vehicle acceleration, deceleration, and constant speed, and have a wide range of applicability and high flexibility.

[0010] In some embodiments, when the vehicle is accelerating or decelerating, the method further includes controlling the discharge power of the pulsed discharge signal output by the battery pack to be equal to the charge power of the pulsed charge signal when the vehicle speed reaches a target speed. Embodiments of the present application can control the constant-speed mode of the vehicle after the vehicle has reached a target speed, and can maintain the charging and discharging of the vehicle in a single target state based on the target speed, in which the amount of energy of constant-current discharge can just meet the vehicle's demand, thereby not only effectively improving the range of the electric vehicle but also significantly improving the lifespan of the battery pack.

[0011] In some embodiments, the aforementioned pulse charge / discharge command is transmitted to the battery pack, causing the battery pack to alternately output a pulse charge signal and a pulse discharge signal while the vehicle is running based on the pulse charge / discharge command, and / or The method includes determining at least one set of alternating charge-discharge modes based on pulse charging, pulse discharging, and resting, and transmitting the at least one set of alternating charge-discharge modes to a battery pack so that the battery pack outputs a pulse charging signal and a pulse discharging signal based on the at least one set of alternating charge-discharge modes. In the embodiments of this application, the pulse charging and discharging process may be diversified, and the pulses can charge or discharge in stages at different magnifications, thereby effectively eliminating cumulative polarization during the continuous charging and discharging process of the battery, improving pulse charging capability, extending the battery's lifespan, improving energy recovery efficiency, and flexibly matching different application scenarios.

[0012] In some embodiments, transmitting a charge / discharge command to a battery pack and causing the battery pack to alternately output a charge signal and a discharge signal while the vehicle is running based on the charge / discharge command includes transmitting a constant-current charge / discharge command to a battery pack and causing the battery pack to alternately output a constant-current charge signal and a constant-current discharge signal while the vehicle is running based on the constant-current charge / discharge command, and recovering battery energy from the vehicle based on the charge signal as described above includes recovering battery energy from the vehicle based on the constant-current charge signal. By alternately outputting a constant-current charge signal and a constant-current discharge signal, it is possible not only to effectively improve the driving range of the electric vehicle but also to reduce the rate of battery decay.

[0013] In a second aspect, an embodiment of the present application provides a battery energy recovery device. The device includes a command transmission module that transmits charge / discharge commands to a battery pack and causes the battery pack to alternately output a charge signal and a discharge signal while the vehicle is running based on the charge / discharge commands, and a battery energy recovery module for recovering battery energy from the vehicle based on the charge signal. By alternately outputting charge signals and discharge signals and recovering battery energy in response to a charge signal, the embodiment of the present application can not only effectively improve the driving range of an electric vehicle but also reduce the rate of battery decay.

[0014] According to the third aspect, an embodiment of the present application provides a battery management system. The battery management system includes at least one processor, and Includes a memory that communicates with and connects to at least one of the aforementioned processors, of which, The memory stores instructions that can be executed by the at least one processor, and the instructions are executed by the at least one processor to cause the at least one processor to perform the method described above. The embodiment of this application can not only effectively improve the driving range of an electric vehicle but also reduce the rate of battery decay by alternately outputting a charging signal and a discharging signal and recovering battery energy when a charging signal is received.

[0015] According to the fourth aspect, an embodiment of the present application provides a battery, the battery comprising a battery core and the battery management system described above, the battery management system being used to manage the charging and discharging of the battery core and to control the battery energy recovery of the vehicle during the charging stage. The battery has energy recovery capabilities and can effectively improve the driving range of an electric vehicle and reduce its own decay rate.

[0016] The battery energy recovery method, apparatus, battery management system, and battery according to the embodiments of this application can not only effectively improve the driving range of electric vehicles, but also effectively eliminate cumulative polarization during the continuous charging and discharging process of the battery by using a method in which charging and discharging are performed alternately, thereby significantly improving the lifespan of the battery pack. [Brief explanation of the drawing]

[0017] One or more embodiments are illustrated by corresponding accompanying drawings, and these illustrative descriptions do not constitute limitations to the embodiments. In the accompanying drawings, elements having the same reference numerals are represented as similar elements, and unless otherwise specified, the figures in the accompanying drawings do not constitute limitations on proportions. [Figure 1] This is a schematic diagram of an application scenario according to an embodiment of this application. [Figure 2] This is a schematic diagram of the structure of a battery management system according to an embodiment of this application. [Figure 3] This is a flowchart of the battery energy recovery method according to the embodiment of this application. [Figure 4] This is a schematic diagram of the pulse accelerating battery pack current according to an embodiment of this application. [Figure 5] This is a schematic diagram of the pulse reduction battery pack current according to an embodiment of this application. [Figure 6] This is a schematic diagram of the current of another pulse accelerating battery pack according to an embodiment of this application. [Figure 7]It is a schematic diagram of the structure of a battery energy recovery device according to an embodiment of the present application.

Embodiments for Carrying Out the Invention

[0018] Hereinafter, embodiments of the technical solution of the present application will be described in detail in conjunction with the accompanying drawings. The following embodiments are only used for the purpose of more clearly explaining the technical solution of the present application, so they are only used as examples and cannot limit the protection scope of the present application.

[0019] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by those skilled in the art. The terms used in this specification are only used to describe specific embodiments and are not intended to limit the present application. The terms "comprising" and "having" and any variations thereof in the description of the specification, claims and the above description of the accompanying drawings are intended to cover non-exclusive inclusion.

[0020] In the description of the embodiments of the present application, technical terms such as "first" and "second" are only used to distinguish different objects, and should not be understood as indicating or suggesting relative importance, or implicitly indicating the number, specific order or primary-secondary relationship of the indicated technical features. In the description of the embodiments of the present application, "a plurality" means two or more unless clearly and specifically limited.

[0021] Referring to "embodiment" in this specification means that a specific feature, structure or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of this phrase at each position in the specification does not necessarily refer to the same embodiment, nor does it refer to an embodiment that is exclusively independent or an alternative embodiment to other embodiments. Those skilled in the art will understand explicitly or implicitly that the embodiments described in this specification can be combined with other embodiments. also It is possible.

[0022] In the description of the embodiments of the present application, the term "and / or" merely describes the relevant relationship of the relevant object and indicates that three relationships may exist. For example, A and / or B may represent three cases: the case where only A exists, the case where A and B exist simultaneously, and the case where only B exists. Also, the symbol " / " in this specification generally represents that the relevant objects before and after are in an "or" relationship.

[0023] Referring to FIG. 1, FIG. 1 is a schematic diagram of an application scenario according to an embodiment of the present application. The battery energy recovery method and device according to the embodiments of the present application may both be used in this application scenario. The application scenario includes a battery management system (BMS) 10, a battery pack 20, a motor 30, a generator 40, and an automobile. The battery management system 10, the battery pack 20, the motor 30, and the generator 40 are mounted on the automobile as components of the automobile. The battery pack 20 can provide electrical energy to external power-consuming devices, and when converting the mechanical energy of external devices into electrical energy, the electrical energy can charge the battery pack 20. The battery pack 20 includes battery modules connected to the battery management system. The battery module includes at least one battery core. When the battery module includes a plurality of battery cores, the plurality of battery cores are connected in series and / or in parallel. The battery management system 10 is used to collect operation parameters of the battery module, such as data on charging / discharging current, voltage, temperature, etc., and is used to control the charging / discharging of the battery module based on the collected operation parameters. Based on the collected operation parameters, the state parameters of the battery can be detected, for example, the state of charge of the battery module can be detected. The motor 30 is used to convert electrical energy into mechanical energy. The generator 40 is used to convert other forms of energy into electrical energy, for example, to convert mechanical energy into electrical energy.

[0024] In the embodiments of this application, throughout the entire process of vehicle operation, the battery management system 10 can transmit charge and discharge commands to the battery pack 20. Based on these charge and discharge commands, the battery pack 20 alternately outputs charge signals and discharge signals to the motor 30 while the vehicle is running. Based on the discharge signal, the motor 30 converts electrical energy into mechanical energy and transmits it to the vehicle to drive the vehicle. Furthermore, based on the charge signal, it transmits the mechanical energy to the generator 40. The generator 40 converts the mechanical energy into electrical energy and then stores this electrical energy in the battery pack 20, thereby achieving battery energy recovery. By performing alternating charge and discharge modes and achieving battery energy recovery during the charging phase, it is possible not only to improve the driving range of the vehicle but also to eliminate cumulative polarization during the continuous charge and discharge process of the battery, thereby effectively improving the service life of the battery pack 20. Among these, the alternating charge and discharge mode includes alternating constant current charging and constant current discharging, and further includes charging and discharging in pulse signal format. The output status of the pulse signal may be determined based on the vehicle's driving speed.

[0025] As those skilled in the art will understand, the structure of the apparatus shown in Figure 1 does not constitute a limitation on application scenarios for battery energy recovery methods and apparatus, and may include more or fewer components than those shown, or any combination of components, or different arrangements of components.

[0026] The following battery energy recovery method and apparatus may be used in the above application scenario, and specifically, the battery energy recovery method may be executed by the battery management system. The battery energy recovery apparatus can realize battery energy recovery as a functional module of the battery management system.

[0027] One embodiment of this application is shown in Figure 2, which is a schematic diagram of the structure of a battery management system according to an embodiment of this application. The battery management system 10 includes one or more processors 101 and memory 102. In Figure 2, one processor 101 is used as an example. The processor 101 and memory 102 may be connected by a bus or by other means, and in Figure 2, they are connected by a bus as an example. The memory 102 may be used as a non-volatile computer-readable storage medium to store non-volatile software programs, non-volatile computer executable programs and modules, for example, program instructions / modules corresponding to the battery energy recovery method in the embodiment of this application (for example, each module shown in Figure 7). The processor 101 executes the non-volatile software programs, instructions and modules stored in the memory 102 to perform various functional applications and data processing of the battery management system, that is, to realize the battery energy recovery method of the embodiment of the following method. The one or more modules are stored in the memory 102 and, when executed by the one or more processors 101, perform a battery energy recovery method in any of the following embodiments, for example, by performing the method steps in Figure 3 described below, thereby realizing the functions of the module in Figure 7.

[0028] In one embodiment of this application, the battery management system 10 may further include a display module, a wireless communication module, a data collection module, and electrical equipment. This battery management system 10 is used for smart management and maintenance of the battery module, prevents overcharging and over-discharging of the battery module, monitors the status of the battery module, extends the service life of the battery module, detects the voltage, current, and temperature of the battery in the battery module using sensors, and performs leakage current monitoring, calculates remaining capacity, and issues alarms.

[0029] The battery management system 10 effectively improves the driving range of the vehicle by implementing the battery energy recovery method, eliminates cumulative polarization during the continuous charging and discharging process of the battery, and effectively improves the lifespan of the battery pack 20.

[0030] The above-mentioned product can perform the method according to the embodiments of this application and be equipped with a functional module and beneficial effects corresponding to the method of execution; refer to the method according to the embodiments of this application.

[0031] Based on the above application scenario, the following embodiment specifically describes the battery energy recovery method of this application.

[0032] Referring to Figure 3, Figure 3 is a flowchart of a battery energy recovery method according to an embodiment of this application. This method may include the following steps.

[0033] S11: A charge / discharge command is sent to the battery pack, causing the battery pack to alternately output a charge signal and a discharge signal while the vehicle is running based on the charge / discharge command.

[0034] S12: Battery energy of the vehicle is recovered based on the charging signal.

[0035] Regarding the charge / discharge command, after the vehicle is started, the vehicle's master device may send the command to the battery management system, the battery management system may distribute the charge / discharge command to the battery pack based on this command, and this charge / discharge command may be specifically given to the battery in the battery module. Of these, the command is used to instruct the activation of the battery energy recovery function, and the charge / discharge command is used to instruct the battery to output a current signal. This current signal may be a DC or a pulsed current.

[0036] The charging signal and the discharge signal may be a constant current charging signal and a constant current discharge signal, respectively, or they may be pulsed electrical signals. The alternating output of the charging signal and the discharge signal as described above means that the charging signal is output within a predetermined first time period, the discharge signal is output within a predetermined second time period, and the predetermined first time period and the predetermined second time period are performed in a predetermined order according to a predetermined rule. The predetermined order according to a predetermined rule as described above means that the charging signal is first output within a predetermined first time period, then the discharge signal is output within a predetermined second time period, then the charging signal is output within a predetermined first time period, then the discharge signal is output within a predetermined second time period, and so on, in a predetermined order. Alternatively, the discharge signal may be first output within a predetermined second time period, then the charging signal is output within a predetermined first time period, then the discharge signal is output within a predetermined second time period, and so on, in a predetermined order. Furthermore, it is also possible that the system first outputs a charging signal within a predetermined first time period, then outputs a charging signal within another predetermined first time period, then outputs a discharge signal within a predetermined second time period, then outputs a discharge signal within another predetermined second time period, and so on, in a sequential manner.

[0037] The format of alternately outputting charging and discharging signals may be configured according to the current application scenario, and the above is merely an illustrative explanation for interpreting the aforementioned alternate output of charging and discharging signals.

[0038] The alternating charging and discharging signals mentioned above are output by the battery pack to the motor. The motor converts electrical energy into mechanical energy based on the discharge signal and transmits it to the vehicle to drive the vehicle. The motor then transmits the vehicle's mechanical energy to the generator based on the charging signal. The generator converts the mechanical energy into electrical energy and stores this electrical energy in the battery pack, thereby achieving battery energy recovery.

[0039] The system can alternately output charging and discharging signals during vehicle startup, vehicle driving, and vehicle braking, thereby enabling the recovery of battery energy at any desired state of the vehicle. The battery energy recovery method according to the embodiment of this application can improve the vehicle's driving range, reduce battery decay, and extend battery life.

[0040] In some embodiments, step S11, which involves sending a charge / discharge command to the battery pack and causing the battery pack to alternately output a charge signal and a discharge signal while the vehicle is running based on the charge / discharge command, specifically includes sending a pulse charge / discharge command to the battery pack and causing the battery pack to alternately output a pulse charge signal and a pulse discharge signal while the vehicle is running based on the pulse charge / discharge command. The aforementioned process of recovering battery energy from the vehicle based on the charge signal includes recovering battery energy from the vehicle based on the pulse charge signal.

[0041] In this embodiment, the vehicle battery pack performs charging and discharging in pulse form. During the discharge phase, the battery pack outputs electrical energy to drive electrical operation and convert it into vehicle power. During the charging phase, the rotational mechanical energy of the vehicle is transmitted to a generator and converted into electrical energy, and the battery energy is recovered by storing this electrical energy in the battery pack.

[0042] In the process of pulsed charging and discharging, the magnitude of the pulsed current signal may be fixed and preset. For example, the pulsed charging and discharging logic of the battery pack is set by the charging window of the battery pack. The charging window includes a pulsed charger, which may be provided by the battery manufacturer, and this pulsed charger records information such as the current that the battery can use at a certain temperature and the battery's charging capacity. In the charging window, the minimum pulsed charging capacity of the battery pack can be selected as a constant charging current to recover energy during the pulsed charging process, and battery energy recovery can be performed with a single charging policy regardless of the charge state of the battery pack. The battery charging capacity recorded in the charging window is close to the upper limit of the battery's capacity, and by setting the pulsed current as close as possible to the window value, the maximum amount of battery energy can be recovered. If it is not necessary to selectively recover a relatively large amount of battery energy, the pulsed current can be set to be small and not too close to the window value, and by achieving battery energy recovery in a relatively gentle manner in this way, the rate of battery decay can be effectively reduced.

[0043] In some embodiments, the magnitude of the pulse current signal present during the pulse charging and discharging process may not be fixed, and for example, the pulse current signal output may be determined based on the vehicle's speed. In this embodiment, transmitting a pulse charging and discharging command to a battery pack and causing the battery pack to alternately output a pulse charging signal and a pulse discharging signal while the vehicle is running based on the pulse charging and discharging command includes acquiring speed information while the vehicle is running, transmitting a pulse charging and discharging command to the battery pack based on the speed information, and causing the battery pack to alternately output a pulse charging signal and a pulse discharging signal based on the speed information.

[0044] Among these, the method of having the battery pack alternately output a pulse charging signal and a pulse discharging signal based on the speed information, as described above, includes controlling the discharge power of the pulse discharging signal output by the battery pack to be greater than the charging power of the pulse charging signal when the speed information indicates that the vehicle is accelerating; controlling the discharge power of the pulse discharging signal output by the battery pack to be less than the charging power of the pulse charging signal when the speed information indicates that the vehicle is decelerating; and controlling the discharge power of the pulse discharging signal output by the battery pack to be equal to the charging power of the pulse charging signal when the speed information indicates that the vehicle is at a constant speed.

[0045] The output status of pulse discharge signals and pulse charge signals is set based on the vehicle's acceleration, deceleration, and constant speed states, and the output pulse discharge signals and pulse charge signals are matched to the vehicle's current driving state. This not only enables the recovery of battery energy and reduces battery decay, but also matches the vehicle's current electrical energy consumption to the vehicle's driving state, thereby improving vehicle performance and ensuring a good driving experience for the user.

[0046] In some embodiments, when the vehicle is accelerating or decelerating, once the vehicle reaches a target speed, the battery management system can further control the discharge power of the pulse discharge signal output by the battery pack to be equal to the charge power of the pulse charge signal. After the vehicle has been accelerated or decelerated to the target speed, the vehicle maintains constant speed driving, at which point the output pulse signal matches the current constant speed driving state of the vehicle. The target speed may be a relatively stable driving speed that the vehicle maintains for a certain period of time. Embodiments of the present application can control the vehicle after it has reached the target speed to maintain constant speed driving, and maintain the charging and discharging of the vehicle based on the target speed to maintain a single target state, where the amount of constant current discharge just satisfies the vehicle's demands, thereby not only effectively improving the range of the electric vehicle but also significantly improving the lifespan of the battery pack.

[0047] For example, when an electric vehicle needs to accelerate, the system detects the state of the accelerator pedal, determines the acceleration demand of the electric vehicle based on the acceleration command from the accelerator pedal, obtains the pulse charge / discharge method for the battery pack in the target situation, and requests the battery pack to output pulse charge / discharge power. The discharge power of the battery pack is greater than the charge power of the battery pack, and in one pulse period, the acceleration of the electric vehicle is greater than the deceleration acceleration during the battery pack energy recovery process, thereby achieving acceleration of the electric vehicle. After the electric vehicle accelerates and reaches the target speed, the charge / discharge method of the electric vehicle's battery pack is switched. In the new pulse charge / discharge method, the pulse discharge power is equal to the pulse charge power, and the electric vehicle is in an equivalent constant speed driving state. For example, when an electric vehicle needs to decelerate, the system detects the brake pedal state, determines the deceleration requirement of the electric vehicle based on the deceleration command from the brake pedal, obtains the pulse charging and discharging method for the battery pack in the target situation, and requests the battery pack to output pulse charging and discharging power. In this method, the charging power of the battery pack is greater than the discharging power of the battery pack, and in one pulse period, the deceleration acceleration during the battery pack energy recovery process is greater than the acceleration acceleration of the electric vehicle, thereby achieving deceleration of the electric vehicle. After the electric vehicle has decelerated and reached the target speed, the charging and discharging method of the electric vehicle's battery pack is switched. In the new pulse charging and discharging method, the pulse charging power is equal to the pulse discharging power, and the electric vehicle is in an equivalent constant speed driving state.

[0048] As described above, charging and discharging are performed using a pulse signal format, and by alternating between charging and discharging, the vehicle's driving range is improved, and the attenuation of the battery during the continuous charging and discharging process is effectively eliminated, significantly improving the battery's lifespan. Furthermore, by adopting the minimum charging capacity of the battery pack and establishing an energy recovery charging policy, the risk of the battery being charged beyond its charging window is greatly reduced, thereby reducing the risk of accelerated battery life decay and effectively extending the battery's lifespan.

[0049] The output format of the pulse charging signal and pulse discharging signal described above is alternating. Specifically, the alternating output of the pulse charging signal and pulse discharging signal is as follows: Pulse charging and pulse discharging, and / or Based on pulse charging, pulse discharging, and static conditions, determine at least one set of alternating charge / discharge modes, This may also include transmitting the at least one set of alternating charge and discharge modes to a battery pack, causing the battery pack to output a pulse charge signal and a pulse discharge signal based on the at least one set of alternating charge and discharge modes.

[0050] For example, the pulse charging and discharging process may be (1) a cycle of pulse charging → pulse discharging → pulse charging → pulse discharging..., but is not limited to this; it may also be a cycle of pulse charging → pulse discharging → rest → pulse charging → pulse discharging → rest...; (3) a cycle of pulse current 1 charging → pulse current 2 charging → pulse current 1 discharging → pulse current 2 discharging →...; or (4) a cycle of pulse current 1 charging → rest → pulse current 2 charging → rest → pulse current 1 discharging → rest → pulse current 2 discharging → rest →.... For example, referring to Figures 4 to 6, Figure 4 is a schematic diagram of the pulse acceleration battery pack current, where the horizontal axis represents time and the vertical axis represents the current value, the charging power is greater than the discharge power, and after charging, it is left to rest before discharging. Figure 5 is a schematic diagram of the pulse deceleration battery pack current, where the horizontal axis represents time and the vertical axis represents the current value, the discharge power is greater than the charging power, and after discharging, it is left to rest before charging. Figure 6 is a schematic diagram of the pulse accelerating battery pack current, where the horizontal axis represents time and the vertical axis represents the current value, and the battery is not left stationary during charging and discharging.

[0051] In the embodiments of this application, the pulsed charge-discharge process may be diversified, and pulses can be used to charge or discharge in stages at different magnifications, thereby effectively eliminating cumulative polarization during the continuous charge-discharge process of the battery, improving pulsed charging capability, extending battery life, improving energy recovery efficiency, and flexibly matching different application scenarios.

[0052] In some embodiments, in addition to performing battery energy recovery in the pulse charge / discharge mode described above, battery energy recovery can also be achieved by employing constant current charging and constant current discharging modes. Specifically, the process of transmitting a charge / discharge command to the battery pack and causing the battery pack to alternately output a charge signal and a discharge signal while the vehicle is running based on the charge / discharge command includes transmitting a constant current charge / discharge command to the battery pack and causing the battery pack to alternately output a constant current charge signal and a constant current discharge signal while the vehicle is running based on the constant current charge / discharge command. The process of recovering the vehicle's battery energy based on the charge signal described above includes recovering the vehicle's battery energy based on the constant current charge signal. A mode in which constant current charging and constant current discharging are performed alternately can improve the vehicle's driving range, reduce the rate of battery decay, and improve the battery's lifespan.

[0053] Referring to Figure 7, Figure 7 is a schematic diagram of the structure of a battery energy recovery device according to an embodiment of the present application. This battery energy recovery device 50 includes a command transmission module 51 and a battery energy recovery module 52. The command transmission module 51 is used to transmit charge and discharge commands to a battery pack and to cause the battery pack to alternately output a charge signal and a discharge signal while the vehicle is running based on the charge and discharge commands, and the battery energy recovery module 52 is used to recover battery energy from the vehicle based on the charge signal.

[0054] Specifically, the command transmission module 51 is used to transmit pulse charge / discharge commands to the battery pack and to cause the battery pack to alternately output pulse charge signals and pulse discharge signals while the vehicle is running based on the pulse charge / discharge commands. Specifically, the battery energy recovery module 52 is used to recover battery energy from the vehicle based on the pulse charge signals.

[0055] In some embodiments, the command transmission module 51 is specifically used to acquire speed information while the vehicle is running, to transmit pulse charge / discharge commands to the battery pack based on the speed information, and to cause the battery pack to alternately output pulse charge signals and pulse discharge signals based on the speed information. The alternating output of pulse charge signals and pulse discharge signals by the battery pack based on the speed information includes: controlling the discharge power of the pulse discharge signal output by the battery pack to be greater than the charge power of the pulse charge signal when the speed information indicates that the vehicle is accelerating; controlling the discharge power of the pulse discharge signal output by the battery pack to be less than the charge power of the pulse charge signal when the speed information indicates that the vehicle is decelerating; and controlling the discharge power of the pulse discharge signal output by the battery pack to be equal to the charge power of the pulse charge signal when the speed information indicates that the vehicle is at a constant speed. When the vehicle is accelerating or decelerating, and the vehicle's speed reaches a target speed, the discharge power of the pulse discharge signal output by the battery pack is controlled to be equal to the charge power of the pulse charge signal.

[0056] In some embodiments, transmitting a pulse charge / discharge command to a battery pack and causing the battery pack to alternately output a pulse charge signal and a pulse discharge signal while the vehicle is running based on the pulse charge / discharge command includes determining at least one set of alternating charge / discharge modes based on pulse charge and pulse discharge, and / or pulse charge, pulse discharge and rest, and transmitting the at least one set of alternating charge / discharge modes to the battery pack and causing the battery pack to output a pulse charge signal and a pulse discharge signal based on the at least one set of alternating charge / discharge modes.

[0057] In some embodiments, the command transmission module 51 is specifically used to transmit constant current charge / discharge commands to the battery pack, causing the battery pack to alternately output a constant current charge signal and a constant current discharge signal while the vehicle is running based on the constant current charge / discharge commands. The battery energy recovery module 52 is specifically used to recover battery energy from the vehicle based on the constant current charge signal.

[0058] Furthermore, the above-described battery energy recovery device is capable of performing the battery energy recovery method according to the embodiments of this application and is equipped with a functional module and beneficial effects corresponding to the method of performance. For details of the technology not described in detail in the embodiments of the battery energy recovery device, refer to the battery energy recovery method according to the embodiments of the present invention.

[0059] Embodiments of this application provide a non-volatile computer-readable storage medium. Computer-executable instructions are stored in the computer-readable storage medium, and these computer-executable instructions are executed by one or more processors, for example, one processor 101 in Figure 2, causing the one or more processors to execute the battery energy recovery method in any of the embodiments described above.

[0060] Embodiments of this application provide a computer program product. The computer program product includes a computer program stored in a non-volatile computer-readable storage medium, the computer program includes program instructions, and when the program instructions are executed by the battery management system, the battery management system is made to execute the battery energy recovery method in any embodiment of the above-described method.

[0061] As will be readily apparent to those skilled in the art from the above description of the embodiments, each embodiment may be implemented by software and a general-purpose hardware platform, or by hardware alone. As will be understood to those skilled in the art, the implementation of all or part of the flow in the methods of the above embodiments may be completed by a computer program that instructs the relevant hardware, and the program may be stored in a computer-readable storage medium, and when the program is executed, it may include flows such as those in the embodiments of each of the above methods. The storage medium may be a magnetic disk, an optical disk, read-only memory (ROM), or random access memory (RAM), etc.

[0062] Finally, it should be noted that the above embodiments are used solely to illustrate the technical concept of this application, but are not limiting. In the concept of this application, the technical features of the above embodiments or different embodiments may be combined, the steps may be carried out in any order, and many other variations of each aspect of this application described above may exist, which are not described in detail for the sake of brevity of explanation. Although this application has been described in detail with reference to the above embodiments, those skilled in the art can still modify the technical concept described in the above embodiments or make equivalent substitutions for some or all of its technical features, but these modifications or substitutions should be understood not to deviate the essence of the relevant technical concept from the scope of the technical concept of each embodiment of this application.

Claims

1. A method for recovering battery energy, This includes transmitting a charge / discharge command to the battery pack while the vehicle is running, and causing the battery pack to alternately output a charging signal and a discharging signal while the vehicle is running based on the charge / discharge command. The aforementioned charging signal includes a direct current or a pulsed current and is for the purpose of recovering battery energy from the vehicle. The discharge signal includes a DC current or a pulsed current. The charging signal is output from the battery pack to the motor, which in turn transmits mechanical energy to the generator, which converts the mechanical energy into electrical energy and stores it in the battery pack. The discharge signal is output from the battery pack to the motor, which converts the electrical energy into mechanical energy and transmits it to the vehicle to drive the vehicle. As described above, sending a charge / discharge command to the battery pack and causing the battery pack to alternately output a charging signal and a discharging signal while the vehicle is running based on the charge / discharge command, This includes transmitting a pulse charge / discharge command to the battery pack, and causing the battery pack to alternately output a pulse charge signal and a pulse discharge signal while the vehicle is running based on the pulse charge / discharge command, As mentioned above, the charging signal includes a DC current or a pulsed current, and in order to recover battery energy from the vehicle, This includes recovering battery energy from the vehicle based on the pulse charging signal, As described above, transmitting a pulse charge / discharge command to the battery pack and causing the battery pack to alternately output a pulse charge signal and a pulse discharge signal while the vehicle is running based on the pulse charge / discharge command, This includes acquiring speed information while the vehicle is in motion, transmitting the pulse charge / discharge command to the battery pack based on the speed information, and causing the battery pack to alternately output the pulse charge signal and the pulse discharge signal based on the speed information. As described above, in order to alternately output the pulse charging signal from the battery pack and the pulse discharging signal from the battery pack based on the speed information, When the speed information indicates that the vehicle is accelerating, the discharge power of the pulse discharge signal output by the battery pack is controlled to be greater than the charge power of the pulse charge signal. When the speed information indicates that the vehicle is in a deceleration state, the discharge power of the pulse discharge signal output by the battery pack is controlled to be less than the charging power of the pulse charge signal. A method for recovering battery energy characterized by the following features.

2. A battery energy recovery device, The system includes a command transmission module that transmits charge / discharge commands to the battery pack while the vehicle is in motion, and that, based on the charge / discharge commands, causes the battery pack to alternately output a charging signal and a discharging signal while the vehicle is in motion. The aforementioned charging signal includes a direct current or a pulsed current and is for the purpose of recovering battery energy from the vehicle. The discharge signal includes a DC current or a pulsed current. The charging signal is output from the battery pack to the motor, which in turn transmits mechanical energy to the generator, which converts the mechanical energy into electrical energy and stores it in the battery pack. The discharge signal is output from the battery pack to the motor, which converts the electrical energy into mechanical energy and transmits it to the vehicle to drive the vehicle. As described above, sending a charge / discharge command to the battery pack and causing the battery pack to alternately output a charging signal and a discharging signal while the vehicle is running based on the charge / discharge command, This includes transmitting a pulse charge / discharge command to the battery pack, and causing the battery pack to alternately output a pulse charge signal and a pulse discharge signal while the vehicle is running based on the pulse charge / discharge command, As mentioned above, the charging signal includes a DC current or a pulsed current, and in order to recover battery energy from the vehicle, This includes recovering battery energy from the vehicle based on the pulse charging signal, As described above, transmitting a pulse charge / discharge command to the battery pack and causing the battery pack to alternately output a pulse charge signal and a pulse discharge signal while the vehicle is running based on the pulse charge / discharge command, This includes acquiring speed information while the vehicle is in motion, transmitting the pulse charge / discharge command to the battery pack based on the speed information, and causing the battery pack to alternately output the pulse charge signal and the pulse discharge signal based on the speed information. As described above, in order to alternately output the pulse charging signal from the battery pack and the pulse discharging signal from the battery pack based on the speed information, When the speed information indicates that the vehicle is accelerating, the discharge power of the pulse discharge signal output by the battery pack is controlled to be greater than the charge power of the pulse charge signal. When the speed information indicates that the vehicle is in a deceleration state, the discharge power of the pulse discharge signal output by the battery pack is controlled to be less than the charging power of the pulse charge signal. A battery energy recovery device characterized by the following features.

3. It is a battery management system, At least one processor, and Includes a memory that communicates with and connects to at least one of the aforementioned processors, of which, The battery management system is characterized in that the memory stores instructions that can be executed by the at least one processor, and the instructions are executed by the at least one processor to cause the at least one processor to perform the method according to claim 1.

4. A battery comprising a battery core and a battery management system according to claim 3, wherein the battery management system is used to manage the charging and discharging of the battery core and to control the battery energy recovery of the vehicle at the stage corresponding to the charging.

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