CN-121998491-A - Application of retired battery in vehicle base integrated system and evaluation method

Abstract

The invention relates to application and an evaluation method of retired batteries in a vehicle base integrated system. At present, a vehicle base cannot integrally combine photovoltaic power generation, braking energy recovery and retired battery energy storage, and cannot comprehensively evaluate an integrated system. The invention comprises grading, screening and recombining retired power battery packs in a echelon manner, establishing an internal distribution type energy storage system in a vehicle base, connecting a photovoltaic power generation system and an electric bus braking energy recovery system with a distributed energy storage system, connecting the distributed energy storage system with a vehicle base internal living load facility, establishing an integrated system of light-vehicle-storage, setting priority, firstly consuming energy in the distributed energy storage system, then supplying power to the vehicle base internal living load facility by an urban power grid system, and arranging a data acquisition end for data acquisition and state monitoring. The invention can integrate photovoltaic power generation, braking energy recovery and retired battery energy storage and comprehensively evaluate an integrated system.

Inventors

• MA LIHUA
• Xie xinfu
• WANG LIJIAN
• LI BANGDONG
• YANG WANXIN
• HUANG DENGQIANG
• HE CHUNYANG
• CHEN RUNWEN
• YANG LEI

Assignees

• 兰州铁道设计院有限公司

Dates

Publication Date

20260508

Application Date

20260116

Claims (10)

1. 1. The application method of the retired battery in the vehicle base integrated system is characterized by comprising the following steps: Performing echelon grading, screening and reorganization on the retired power battery pack to establish an distributed energy storage system in a vehicle base; Connecting a photovoltaic power generation system and an electric bus braking energy recovery system with the distributed energy storage system, wherein the distributed energy storage system is connected with a living load facility in a vehicle base, and an integrated system of light, vehicle and storage is built; The energy in the distributed energy storage system is firstly consumed by setting priority, and when the energy in the distributed energy storage system is insufficient, the urban power grid system supplies power to the living load facilities in the vehicle base; and arranging a related data acquisition end, and respectively carrying out data acquisition and state monitoring on the distributed energy storage system, the photovoltaic power generation system and the electric bus braking energy recovery system.
2. 2. The method of using the retired battery according to claim 1 in a vehicle base integrated system, wherein: The echelon grade division is divided into five grades, which are respectively: When SOH is more than or equal to 80%, the energy storage device is used for distributed pure energy storage; When SOH is 75 percent or more and is less than 80 percent, the battery is used for a household electric automobile battery and an automobile starting battery; when SOH is more than or equal to 55% and less than 75%, the power supply is used as an emergency power supply, a base station power supply and a standby power supply for entertainment facility lamplight; when SOH is more than or equal to 35% and less than 55%, the LED lamp is used for a mobile power supply, a street lamp and an outdoor household lighting power supply; when SOH is less than 35%, the recovery process is directly carried out.
3. 3. The method of using the retired battery according to claim 1 in a vehicle base integrated system, wherein: when the energy utilization efficiency is greater than the vehicle base load power, the redundant electric power capacity is stored in the distributed energy storage system; When the energy utilization efficiency is smaller than the vehicle base load power, the missing part is dynamically supplemented by the electric energy of the urban power grid system.
4. 4. The method of using the retired battery according to claim 1 in a vehicle base integrated system, wherein: stopping charging and switching to a floating charge state when the SOC of the energy storage facility is more than or equal to 90%; When the SOC is less than or equal to 20%, low-power early warning is sent out, and power supply of a key load is guaranteed preferentially.
5. 5. The evaluation method of the retired battery in the vehicle base integrated system is characterized by comprising the following steps of: selecting five indexes of practicality, reliability, economy, safety and environmental protection to build an evaluation system, selecting quantitative evaluation indexes, and defining each index definition and calculation method; determining each index weight factor by adopting an analytic hierarchy process and an entropy weight process; Normalizing the collected running state data by adopting an extremum standardization method; Calculating a system comprehensive evaluation score by a weighted summation method, and determining a system comprehensive evaluation grade by combining a grading standard; and identifying a weak link of the system according to the evaluation result, and pertinently optimizing energy storage facility configuration, energy scheduling strategy or hardware parameters.
6. 6. The method for evaluating retired battery in a vehicle base integrated system according to claim 5, characterized in that: The reliability index comprises average fault-free running time of the system, charging and discharging efficiency of energy storage facilities and energy conversion efficiency of a photovoltaic power generation system, the economical index comprises yield, investment cost saving and energy saving measurement of a light vehicle storage system, the safety index comprises thermal runaway rate, insulation resistance and protection response time, and the environment-friendly index is carbon emission reduction.
7. 7. The method for evaluating retired battery in a vehicle base integrated system according to claim 5, characterized in that: The analytic hierarchy process determines subjective weights and the entropy weight process determines objective weights.
8. 8. The method for evaluating retired battery in a vehicle base integrated system according to claim 7, characterized in that: Comprehensive weight = 0.45 x subjective weight +0.55 x objective weight.
9. 9. The method for evaluating retired battery in a vehicle base integrated system according to claim 5, characterized in that: Composite evaluation score = Σ (normalized index value x index composite weight).
10. 10. The method for evaluating retired battery in a vehicle base integrated system according to claim 5, characterized in that: The comprehensive evaluation score ranges from 0 to 100 points, and the evaluation grade is defined according to the score: excellent: the system has excellent comprehensive performance and can be directly popularized in large scale, wherein the total performance is more than or equal to 80 minutes; the system performance is good in 70-79 minutes, and only slight optimization is needed; the system basically meets the use requirement and needs to improve the weak index in a targeted way after 60-69 minutes; Failure is <60 minutes, and the system has serious defects and needs to be redesigned or parameter adjustment.

Description

Application of retired battery in vehicle base integrated system and evaluation method Technical Field The invention relates to the technical field of battery application, in particular to application and an evaluation method of retired batteries in a vehicle base integrated system. Background In urban rail transit construction, the vehicle base is the infrastructure with the largest centralized land use mode, the vehicle base occupies more than 10ha (hectare ), for the vehicle base related to property development, the vehicle base occupies more than 30ha, the vehicle base is also the large power consumer in the urban rail transit construction, the vehicle base is mainly used for daily maintenance, regular maintenance, maintenance work of large and frame repair and the like, the vehicle base is also an operation hub of the whole urban rail transit system, an integrated building, a maintenance warehouse and an operation warehouse are arranged, a control center and other facilities are partially arranged, the roof building area of the single maintenance warehouse and the operation warehouse basically reaches more than 4 ten thousand m 2, the wide space and occupied area provide favorable conditions for arranging new energy facilities, and a resistance chamber is arranged in the vehicle base. Meanwhile, the gradient utilization of retired batteries in the energy storage field becomes a research hot spot, but the integrated application scheme of 'light-vehicle-storage' aiming at the specific scene of a vehicle base is not mature, the photovoltaic power generation, the braking energy recovery and the retired battery energy storage cannot be organically combined, and in addition, a comprehensive evaluation system aiming at the integrated system cannot be provided at present, the comprehensive performances of the system such as the practicability, the reliability and the like cannot be scientifically quantified, and the large-scale popularization and the optimization upgrading of the system are restricted. Therefore, there is a need for an application and an evaluation method of retired batteries in a vehicle-base integrated system, which can build an integrated system of photovoltaic power generation, brake energy recovery and retired battery energy storage and can comprehensively evaluate the integrated system. Disclosure of Invention The invention aims to provide an application and an evaluation method of a retired battery in a vehicle base integrated system, so as to at least solve the problems that the existing vehicle base cannot integrate photovoltaic power generation, braking energy recovery and retired battery energy storage and cannot comprehensively evaluate the integrated system. In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: An application method of retired batteries in a vehicle base integrated system, the application method comprising the steps of: Performing echelon grading, screening and reorganization on the retired power battery pack to establish an distributed energy storage system in a vehicle base; Connecting a photovoltaic power generation system and an electric bus braking energy recovery system with the distributed energy storage system, wherein the distributed energy storage system is connected with a living load facility in a vehicle base, and an integrated system of light, vehicle and storage is built; The energy in the distributed energy storage system is firstly consumed by setting priority, and when the energy in the distributed energy storage system is insufficient, the urban power grid system supplies power to the living load facilities in the vehicle base; and arranging a related data acquisition end, and respectively carrying out data acquisition and state monitoring on the distributed energy storage system, the photovoltaic power generation system and the electric bus braking energy recovery system. Further, the echelon grade division is divided into five grades, which are respectively: When SOH is more than or equal to 80%, the energy storage device is used for distributed pure energy storage; When SOH is 75 percent or more and is less than 80 percent, the battery is used for a household electric automobile battery and an automobile starting battery; when SOH is more than or equal to 55% and less than 75%, the power supply is used as an emergency power supply, a base station power supply and a standby power supply for entertainment facility lamplight; when SOH is more than or equal to 35% and less than 55%, the LED lamp is used for a mobile power supply, a street lamp and an outdoor household lighting power supply; when SOH is less than 35%, the recovery process is directly carried out. Further, when the energy utilization efficiency is greater than the vehicle base load power (electric bus braking capacity + photovoltaic power generation capacity), the surplus power capacity is stored in the distributed energy storage system