A power battery vehicle-to-grid interaction service life prolonging method, device, equipment and medium based on pulse discharge

Abstract

The present application relates to the technical field of vehicle-to-grid interaction, and particularly relates to a power battery vehicle-to-grid interaction life prolonging method, device, equipment and medium based on pulse discharge, which comprises the following steps: screening charge-discharge units capable of performing pulse discharge in a target charging station; dividing a collaborative group composed of multiple charge-discharge units; generating a pulse power distribution strategy of the collaborative group; and controlling the collaborative group to perform pulse discharge, so that the whole charging station keeps constant power discharge to the power grid. Through single-vehicle pulse power and collaborative group constant power, the whole charging station can realize constant power output, which not only meets the stable total power required by power grid peak regulation, but also makes the battery work in pulse mode to reduce the decay rate of battery capacity. Without modifying the vehicle BMS or battery hardware, the method is realized only through the charging station scheduling system, which is beneficial to rapid commercial deployment. An effective battery life prolonging solution is proposed for the V2G scene, which is conducive to improving the willingness of vehicle owners to participate in V2G and releasing the support value of V2G to the power grid.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vehicle-to-grid interaction, and in particular to a power battery vehicle-to-grid interaction life extension method, device, equipment and medium based on pulse discharge. BACKGROUND

[0002] Vehicle-to-grid (V2G) technology provides flexible regulation support for new power systems by connecting new energy vehicle power batteries as controllable loads or mobile energy storage units to the grid. However, V2G activities significantly increase the ampere-hour throughput of the battery, which is equivalent to increasing the cycle number, and may accelerate the capacity decay and life decline of the battery, becoming one of the core concerns that hinder vehicle owners from participating.

[0003] Current power battery life extension methods mainly focus on charging process optimization, such as using pulse charging, low-temperature preheating, etc. in the charging strategy control to prevent overcharging or lithium precipitation. For example, Chinese patent solution CN118572837B avoids low-temperature high-SOC damage through pulse charging to prevent the battery from lithium precipitation, thereby extending the battery life. Charging parameter adaptation is to dynamically adjust the charging threshold according to the health state, such as Chinese patent disclosure CN119582375A changing the battery target charging capacity value according to the battery health state, thereby achieving the effect of extending the life.

[0004] The existing technology focuses on life protection in charging conditions and does not involve active life extension control in the discharge process. V2G provides an actively controllable discharge window for power batteries, but the current V2G strategy still uses continuous discharge mode, which causes the battery to be in a steady-state current stress for a long time, which may exacerbate electrode material fatigue.

[0005] The information disclosed in this BACKGROUND section is only intended to enhance the understanding of the general background of the present disclosure and is not intended to be a recognition or any form of suggestion that this information constitutes prior art. SUMMARY

[0006] The present application provides a power battery vehicle-to-grid interaction life extension method based on pulse discharge, which can effectively solve the problems in the background technology.

[0007] In order to achieve the above purpose, the technical solution adopted by the present application is:

[0008] A power battery vehicle-to-grid interaction life extension method based on pulse discharge, comprising the following steps:

[0009] Determine the charging and discharging unit information and V2G strategy of the target charging station participating in V2G;

[0010] Determine the V2G power upper limit of each charging and discharging unit, and select the charging and discharging units that can perform pulse discharge.

[0011] The screened charge and discharge units are divided into cooperative groups composed of at least two charge and discharge units according to a preset power threshold;

[0012] The pulse frequency is set f , and a pulse power distribution strategy of the cooperative group is generated;

[0013] The constant power discharge strategy is converted into a pulse power discharge strategy, and the cooperative group is controlled to perform pulse discharge, so that the charging station as a whole maintains constant power to discharge to the power grid.

[0014] Further, the charge and discharge units include new energy vehicles and charging piles connected thereto, the V2G strategy is a constant power discharge mode, and the reference discharge power of the charging pile is obtained P 0 and the total discharge duration t 0.

[0015] Further, the determination of the V2G power upper limit of each charge and discharge unit includes the following steps:

[0016] The maximum output power of the charging pile is obtained pmax ; P The maximum discharge power of the new energy vehicle is obtained bmax ;

[0017] P

[0018] The minimum value of the maximum output power of the charging pile and the maximum discharge power of the new energy vehicle is selected as the V2G power upper limit of each charge and discharge unit P max .

[0019] Further, the division strategy of the cooperative group is as follows:

[0020] When P max > 3 P 0, the charge and discharge units are added to a three-unit cooperative group or a two-unit cooperative group;

[0021] When 2 P 0≤ P max < 3 P 0, the charge and discharge units are added to a two-unit cooperative group;

[0022] If P max < 2 P 0, the charge and discharge units do not participate in pulse discharge grouping;

[0023] The two-unit cooperative group is preferentially constructed in the division process.

[0024] Further, the pulse power distribution strategy of the cooperative group is as follows:

[0025] The pulse power of each of the charge-discharge units in the cooperative group is output in time T =1 / f .

[0026] The pulse amplitude is k · P 0, and the pulse width is T / k . k The number of the charge-discharge units in the cooperative group is

[0027] The pulse phase difference of each of the charge-discharge units in the cooperative group is 360° / k , and the total output power of the cooperative group is constant k · P 0.

[0028] Further, the pulse power discharge strategy satisfies:

[0029] The three-unit cooperative group including three charge-discharge units has three vehicle pulse signals in a single cycle (3 P 0, 0, 0), (0, 3 P 0, 0), and (0, 0, 3 P 0).

[0030] The two-unit cooperative group including two charge-discharge units has two vehicle pulse signals in a single cycle (2 P 0, 0), and (0, 2 P 0).

[0031] Further, the pulse frequency f satisfies: f >8.2mHz, preferably 10mHz.

[0032] Further, during the execution of the pulse power discharge strategy, in response to the exit signal of any of the charge-discharge units in the cooperative group, the remaining charge-discharge units in the cooperative group are switched to the constant power discharge mode.

[0033] A pulse discharge-based power battery vehicle-to-grid interaction life extension device, using the above method, comprising:

[0034] An information acquisition module for acquiring the charge-discharge unit information and V2G strategy of the target charging station participating in V2G;

[0035] A screening module for determining the V2G power upper limit of each charge-discharge unit and screening the charge-discharge units that can perform pulse discharge;

[0036] The cooperative group division module is configured to divide the screened charging and discharging units into at least two cooperative groups according to a preset power threshold.

[0037] The strategy generation module is configured to set a pulse frequency and generate a pulse power distribution strategy for the cooperative groups.

[0038] The pulse control module is configured to convert the constant power discharging strategy into a pulse power discharging strategy, control the cooperative groups to perform pulse discharging, and keep the entire charging station at a constant power to discharge to the power grid.

[0039] A computer device includes a memory, a processor, and a computer program stored in the memory and executable on the processor, and the processor implements the above method when executing the computer program.

[0040] A storage medium has a computer program stored thereon, and the computer program is executable by a processor to implement the above method.

[0041] The present application has the following advantages:

[0042] The application discloses a power battery vehicle-to-grid interaction service life prolonging method based on pulse discharging.

[0043] The present application has the following advantages: BRIEF DESCRIPTION OF DRAWINGS

[0044] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description only illustrate some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.

[0045] Figure 1 The present application has the following advantages:

[0046] Figure 2 The present application has the following advantages:

[0047] Figure 3The pulse power distribution strategy of the dual-unit cooperative group in the application;

[0048] Figure 4 The structural schematic diagram of the computer device. DETAILED DESCRIPTION

[0049] The technical solutions in the embodiments of the application will be clearly and completely described below with reference to the drawings in the embodiments of the application.

[0050] It should be noted that when an element is referred to as being "fixed" to another element, it can be directly on the other element or there can be intervening elements. When an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element, or intervening elements can be present. The terms "vertical", "horizontal", "left", "right", and the like as used herein are used for illustration only and are not intended to be limiting.

[0051] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in this description, the singular forms "a", "an" and "the" include plural references unless the context clearly dictates otherwise.

[0052] The application discloses a power battery vehicle-to-grid interaction life prolonging method based on pulse discharge, and proposes an effective battery life prolonging solution for a V2G scene, which is beneficial to improving the willingness of a vehicle owner to participate in V2G and releasing the support value of V2G to a power grid.

[0053] The core value of vehicle-to-grid interaction is to regard a power battery of an electric vehicle as a controllable load and a mobile energy storage unit of a power grid, provide flexible adjustment capability, and support efficient and economic operation of a new type of power system. However, compared with normal vehicle use, participation in V2G can accelerate the aging process of the battery, and therefore a technical obstacle of damaging the life of the battery is a key factor affecting the participation of the vehicle owner in V2G.

[0054] The essence of the problem is that the V2G activity increases the ampere-hour throughput of the battery pack, which is equivalent to increasing the cycle number of the battery. The life of the battery usually refers to the capacity retention rate / resistance growth, which is highly related to the equivalent full charge and discharge cycle number experienced by the battery. Each charge and discharge cycle will bring irreversible losses such as structural changes of active materials, consumption of electrolyte, and growth of SEI film. The inflow and outflow of energy in the process of participation of the vehicle in V2G additionally increases the charge and discharge cycle amount of the battery, and the part of the cycle is superimposed on the charge and discharge required by normal driving of the vehicle itself.

[0055] At the same ampere-hour throughput, the continuous constant-current discharge has a higher capacity attenuation rate than the pulse discharge, but the power grid peak shaving requires the charging station to output constant power, but constant power discharge will aggravate the accumulation of battery stress, causing the realistic contradiction that V2G participation is damaged.

[0056] The method for prolonging the service life of a power battery vehicle-to-grid interaction based on pulse discharge disclosed in the present application scheme realizes whole-station constant power output through single-vehicle pulse discharge, and reduces the capacity attenuation rate of the battery through power time sequence redistribution. Figure 1 As shown in the figure, the method comprises the following steps:

[0057] Determine the charging and discharging unit information and V2G strategy of the target charging station participating in V2G; determine the V2G power upper limit of each charging and discharging unit, and screen the charging and discharging units that can perform pulse discharge; divide the screened charging and discharging units into at least two charging and discharging units to form a cooperative group according to a preset power threshold; set a pulse frequency f , and generate a pulse power distribution strategy for the cooperative group; convert the constant power discharge strategy into a pulse power discharge strategy, control the cooperative group to perform pulse discharge, and make the whole charging station maintain constant power discharge to the power grid.

[0058] In the specific implementation process, the charging and discharging unit information includes the maximum charging and discharging power, state of charge (SOC), state of health (SOH), and temperature of the vehicle battery pack; and the maximum power, voltage, and current limit of the charging pile. The V2G strategy refers to the vehicle-to-grid interaction mode and specific interaction strategy given by the dispatching center according to the demand scenario of the power grid. The interaction strategy includes constant power discharge, dynamic power, etc. The constant power discharge mode is usually used when V2G is used for power grid peak shaving scenario, and the dynamic power mode is used when V2G is used for frequency regulation scenario.

[0059] The present application scheme mainly relates to the constant power discharge mode, does not modify the vehicle BMS or battery hardware, and is realized only through the charging station dispatching system, which is beneficial to rapid commercial deployment. The implementation steps include dynamic capability assessment, intelligent grouping, setting pulse distribution strategy, and fault tolerance mechanism; specifically, the SOH, SOC, and charging pile P max of the vehicle are acquired in real time to screen the vehicles that can participate in pulse discharge, dynamically group the charging and discharging units in the station field, and maximize the equipment utilization rate; the pulse parameters generated according to the pulse distribution strategy are used to control the charging and discharging units in the station field, and the discharge strategy is adjusted according to the fault tolerance mechanism when the vehicle exits to avoid overcurrent risk.

[0060] In the present embodiment, the charging and discharging unit includes a new energy vehicle and a charging pile connected thereto, the V2G strategy is a constant power discharge mode, and the reference discharge power P 0 and the total discharge duration t 0 of the charging pile are acquired.

[0061] Further determine the V2G power upper limit of each charging and discharging unit, comprising the following steps:

[0062] Obtain the maximum output power of the charging pile P pmax ; Obtain the maximum discharging power of the new energy vehicle P bmax ; Select the minimum value of the maximum output power of the charging pile and the new energy vehicle as the V2G power upper limit of each charging and discharging unit P max .

[0063] The division strategy of the cooperative group is as follows:

[0064] When P max > 3 P 0, the charging and discharging unit is added to a three-unit cooperative group or a two-unit cooperative group;

[0065] When 2 P max < 3 P 0, the charging and discharging unit is added to a two-unit cooperative group; P If

[0066] max < 2 P 0, the charging and discharging unit does not participate in the pulse discharge grouping; P In the division process, the two-unit cooperative group is preferentially constructed.

[0067] In the specific implementation process, the vehicle grouping method first screens the vehicles and the number that can perform pulse power discharge according to the charging pile V2G power upper limit. If the charging pile V2G power upper limit is greater than or equal to 3 times the V2G power, that is,

[0068] max > 3 P 0, then the charging pile power is sufficient and can perform pulse power discharge, which can be in a three-vehicle group or a two-vehicle group, and the number is recorded as M; if 2 P max < 3 P 0, then the charging pile can perform pulse power discharge, but is only applicable to a two-vehicle group, and the number is recorded as D; if P max < 2 P 0, then the charging pile cannot perform pulse power discharge, and the total number of charging piles that can perform pulse power discharge is recorded as N=M+D. P P

[0069] ​​Secondly, the charging pile that can discharge pulse power is divided into three vehicle groups and double vehicle groups according to the principle of double vehicle group priority. For example, N=21, M=9, D=12, the number of three vehicle groups is 1 group, and the number of double vehicle groups is 9 groups. For example, N=20, M=9, D=11, the number of three vehicle groups is 0 group, and the number of double vehicle groups is 10 groups.

[0070] Based on the above embodiment, the embodiment relates to pulse parameter generation, and through vehicle cooperation, single-vehicle pulse power and cooperative group constant power are realized, so that the required stable total power for grid peak regulation is met, and single battery works in a pulse mode. Specifically, the pulse power distribution strategy of the cooperative group is as follows:

[0071] The charging and discharging units in the cooperative group are divided into three groups according to a cycle T =1 / f and output pulse power at different times;

[0072] The pulse amplitude is k · P 0, the pulse width is T / k , k is the number of charging and discharging units in the cooperative group;

[0073] The pulse phase difference of the charging and discharging units in the cooperative group is 360° / k , and the total output power of the cooperative group is constant k · P 0.

[0074] As shown in Figure 2 and Figure 3 , the pulse power discharge strategy meets:

[0075] The three-unit cooperative group including three charging and discharging units has three-vehicle pulse signals (3 P 0, 0, 0), (0, 3 P 0, 0), and (0, 0, 3 P 0) in a single cycle; the three vehicles output in turn, and the phase difference is 120°, so that the single pulse time is short, and the battery damage is low.

[0076] The two-unit cooperative group including two charging and discharging units has two-vehicle pulse signals (2 P 0, 0) and (0, 2 P 0) in a single cycle; at this time, the two vehicles output alternately, the phase difference is 180°, the compatibility is strong, and most vehicle types are covered.

[0077] Through group cooperative discharge, the “continuous load” of a single vehicle is converted into “pulse load”, while the output power of the whole group is kept constant, and the stability of the power grid and the battery life are perfectly balanced.

[0078] In the embodiment, the pulse frequency fSatisfy: f 8.2mHz, preferably 10mHz. Avoid harmful low frequency (<8.2mHz), select the frequency band that is beneficial to the reconstruction of the SEI film, while reducing the number of power device actions. Special cases can also dynamically adjust the frequency, such as increasing the frequency to 15mHz at 40℃, and increasing the frequency to shorten the pulse width to facilitate heat dissipation at high temperature.

[0079] Secondly, a soft start-stop mechanism is set, the rising edge and falling edge of the pulse power are set with a slope transition period, and the transition period is not more than 10ms. It can reduce the impact of current mutation on battery polarization and prolong the cycle life.

[0080] In this embodiment, during the execution of the pulse power discharge strategy, in response to the exit signal of any charging and discharging unit in the cooperative group, the remaining charging and discharging units in the cooperative group are switched to the constant power discharge mode. Prevent the power gap in the group from affecting the whole-station constant power constraint and ensure the safety of the power grid.

[0081] Secondly, by monitoring whether the number of exiting vehicles exceeds a set threshold, such as the number of exiting vehicles exceeding 10% of the total number, triggering global regrouping, the remaining vehicle life gain can be maximized.

[0082] See Figure 4 The structural schematic diagram of the computer device provided by the embodiment of the application is shown. The computer device 400 provided by the embodiment of the application comprises a processor 410 and a memory 420, the memory 420 stores a computer program executable by the processor 410, and the computer program is executed by the processor 410 to perform the method as above.

[0083] The embodiment of the application also provides a power battery vehicle-to-grid interaction life extension device based on pulse discharge, using the above method, comprising:

[0084] An information acquisition module is configured to acquire charging and discharging unit information participating in V2G and a V2G strategy in a target charging station;

[0085] A screening module is configured to determine a V2G power upper limit of each charging and discharging unit and screen charging and discharging units that can perform pulse discharge;

[0086] A cooperative group division module is configured to divide the screened charging and discharging units into at least two cooperative groups composed of charging and discharging units according to a preset power threshold;

[0087] A strategy generation module is configured to set a pulse frequency and generate a pulse power distribution strategy of the cooperative group;

[0088] A pulse control module is configured to convert the constant power discharge strategy into a pulse power discharge strategy, control the cooperative group to perform pulse discharge, and make the charging station maintain constant power discharge to the power grid.

[0089] This application embodiment also provides a storage medium 430, on which a computer program is stored, and the computer program is executed by a processor 410 to perform the above method.

[0090] The storage medium 430 can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as Static Random Access Memory (SRAM), Electrically Erasable Programmable Read-Only Memory (EEPROM), Erasable Programmable Read Only Memory (EPROM), Programmable Red-Only Memory (PROM), Read-Only Memory (ROM), magnetic storage, flash memory, magnetic disk, or optical disk.

[0091] In the description of this invention, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. "A plurality of" means two or more, unless otherwise explicitly specified.

[0092] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0093] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Furthermore, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0094] Any process or method description in the flowchart or otherwise herein can be understood as representing a module, segment, or portion of code comprising one or more executable instructions for implementing a particular logical function or process, and the scope of the preferred embodiments of the invention includes additional implementations in which functions may be performed not in the order shown or discussed, including substantially simultaneously or in reverse order depending on the functions involved, as will be understood by those skilled in the art to which embodiments of the invention pertain.

[0095] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a ordered list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (such as a computer-based system, a processor-included system, or other system that can fetch and execute instructions from, an instruction execution system, apparatus, or device). For the purposes of this specification, "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transmit programs for use by, or in conjunction with, an instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of computer-readable media include: an electrical connection having one or more wires (electronic device), a portable computer disk drive (magnetic device), random access memory (RAM), read-only memory (ROM), erasable and editable read-only memory (EPROM or flash memory), fiber optic devices, and portable optical disc read-only memory (CDROM). Alternatively, the computer-readable medium may be paper or other suitable media on which the program can be printed, since the program can be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, interpreting, or otherwise processing as necessary, and then stored in a computer memory.

[0096] It should be understood that various parts of the present invention can be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0097] Those skilled in the art will understand that all or part of the steps of the methods in the above embodiments can be implemented by a program instructing related hardware. The program can be stored in a computer-readable storage medium, and when executed, the program includes one or a combination of the steps of the method embodiments.

[0098] The storage medium mentioned above can be a read-only memory, a disk, or an optical disk, etc. Although embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

Claims

1. A method for extending the lifespan of a power battery based on pulse discharge and vehicle-grid interaction, characterized in that, Includes the following steps: Determine the power information of new energy vehicles and their connected charging piles in the V2G charging and discharging units within the target charging station, and determine that the V2G strategy is constant power discharge mode. Determine the upper limit of V2G power for each charge / discharge unit and select charge / discharge units that can perform pulse discharge. The selected charge / discharge units are divided into cooperative groups consisting of at least two charge / discharge units based on a preset power threshold. Set pulse frequency f It generates a pulse power allocation strategy for the cooperative group, converts the constant power discharge strategy of the cooperative group into a pulse power discharge strategy, and controls the cooperative group to perform pulse discharge. Determining the upper limit of V2G power for each charging and discharging unit includes the following steps: Obtain the reference discharge power of the charging pile. P 0 and total discharge duration t 0; Obtain the maximum output power of the charging pile P pmax ; Obtain the maximum discharge power of the new energy vehicle P bmax ; The minimum value between the maximum output power of the charging pile and the new energy vehicle is selected as the upper limit of the V2G power of each charging and discharging unit. P max ; The strategy for dividing the collaborative groups is as follows: when P max >3 P At 0, the charging / discharging unit is added to a three-unit cooperative group or a two-unit cooperative group; When 2 P 0≤ P max <3 P At time 0, the charging / discharging unit is added to the dual-unit cooperative group; like P max <2 P 0. The charging and discharging unit does not participate in pulse discharge grouping; During the partitioning process, the dual-unit collaborative group is constructed first; The pulse power allocation strategy of the cooperative group is as follows: The charging and discharging units within the collaborative group are arranged in a periodic manner. T =1 / f Time-division output pulse power; Pulse amplitude is k · P 0, pulse width is T / k , k The number of charging and discharging units within the collaborative group. P 0 represents the reference discharge power of the charging pile; The pulse phase difference between each charging / discharging unit within the collaborative group is 360°. k The total output power of the coordinated group is constant. k · P 0; The pulse power discharge strategy satisfies: The three-unit coordinated group, including the three charging and discharging units, has a three-vehicle pulse signal in a single cycle of (3) P 0,0,0), (0,3) P 0,0), (0,0,3) P 0); The dual-unit cooperative group, including the two charging and discharging units, has two vehicle pulse signals in a single cycle: (2) P 0,0), (0,2) P 0).

2. The method for extending the lifespan of a power battery based on vehicle-grid interaction according to claim 1, characterized in that, The pulse frequency f satisfy: f >8.2mHz.

3. The method for extending the lifespan of a power battery based on vehicle-grid interaction according to claim 1, characterized in that, During the execution of the pulse power discharge strategy, in response to the exit signal of any of the charging and discharging units in the cooperative group, the remaining charging and discharging units in the cooperative group are switched to constant power discharge mode.

4. A power battery vehicle-grid interaction life extension device based on pulse discharge, characterized in that, Using the method as described in any one of claims 1-3 includes: The information acquisition module is used to acquire information on charging and discharging units participating in V2G and V2G strategies within the target charging station; The screening module is used to determine the upper limit of V2G power for each charging and discharging unit and to screen the charging and discharging units that can perform pulse discharge. The cooperative group division module is used to divide the selected charge and discharge units into cooperative groups consisting of at least two charge and discharge units according to a preset power threshold. The strategy generation module is used to set the pulse frequency and generate the pulse power allocation strategy for the cooperative group; The pulse control module is used to convert the constant power discharge strategy into a pulse power discharge strategy, control the cooperative group to perform pulse discharge, and enable the entire charging station to maintain constant power discharge to the grid.

5. A computer device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the method as described in any one of claims 1-3.

6. A storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the method as described in any one of claims 1-3.

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