354 results about "Electric bus" patented technology

A low floor electric bus includes a frame extending longitudinally from a front end to a rear end, the frame having two sidepieces and a plurality of crossmembers extending between and coupled to the sidepieces, wherein the frame has a central section positioned at a lower height relative to the front and / or rear sections. The bus further includes a battery pack mounted to the central section of the frame; a powertrain having an electric motor and a driveshaft, wherein the electric motor is mounted to the rear section of the frame behind a rear axle coupled to the frame and the driveshaft extends from the electric motor to the rear axle; and a cradle coupled to the front section of the frame. A mixed-material cabin is also provided. The cabin includes a passenger cabin with a floor, sidewalls, and ceiling having steel, ceramic, and composite components.

A wind-photovoltaic ratio system optimization configuration method for a new energy hydrogen production park, the method comprising the steps of: S1) calculating an output time series of local wind power and photovoltaic power generation, and analyzing wind power and photovoltaic output characteristics and a wind-photovoltaic correlation; S2) establishing equivalent device models of a hydrogen energy storage unit and an electrochemical energy storage unit to form an electric bus power balance and hydrogen bus power balance relationship, and taking the minimization of a full life cycle cost as an objective function and taking into consideration constraint conditions such as the power balance, device operation characteristics and a land restriction to establish a system planning optimization configuration model for a new energy hydrogen production park, which model takes a wind-photovoltaic ratio into consideration; S3) integrating the objective function and the constraint conditions to obtain a system planning and optimization configuration scheme for the new energy hydrogen production park and the total system configuration cost; and S4) taking into consideration an electricity price factor and an energy storage operation characteristic constraint, performing annual hydrogen production timing operation simulation, and analyzing a park electricity purchase demand and a new energy consumption capacity under the present planning optimization configuration scheme.

The invention relates to the technical field of intelligent scheduling of bus real-time data, in particular to an intelligent scheduling optimization system based on bus real-time data and a control method thereof, comprising a data acquisition module, a regional scheduling module, a charging strategy module, an intelligent optimization module, a communication module and a display and control module; the data acquisition module is used for acquiring operation data of the electric bus in real time, including position, speed, battery remaining capacity, current passenger number and environment information; according to the system, the running route and the charging plan of the buses can be dynamically adjusted, the operation efficiency of the electric bus fleet is improved, the charging strategy module combines the battery electric quantity, the endurance mileage prediction and the charging station load, the charging process is optimized, the charging efficiency is improved, and the charging efficiency of the electric bus fleet is improved. And the intelligent optimization module considers a battery life optimization strategy, and the service life of the battery is prolonged by reasonably scheduling the charging time and power.

The invention belongs to the technical field of aviation second power systems, and provides a dual-fuel aircraft combined power system which comprises an air compressor, a heat regenerator, a main combustion chamber, a gas turbine, a PEM fuel cell and a starting / power generator, the starting / power generator, the air compressor and the gas turbine are of a coaxial structure, air compressed by the air compressor is divided into two paths, and the two paths are communicated with each other. One path of compressed air enters the main combustion chamber through the cold end of the heat regenerator, and the rear end of the main combustion chamber is connected with a gas turbine; the other path of compressed air enters the PEM fuel cell, the PEM fuel cell supplies power to the electric bus bar, and the reaction rear end of the PEM fuel cell is connected with the gas turbine; the gas turbine is jointly driven by the main combustion chamber and the PEM fuel cell, and an exhaust channel of the gas turbine passes through the hot end of the heat regenerator. The fuel cell power generation unit composed of the H2 fuel tank, the PEM fuel cell and the secondary combustion chamber is used for receiving high-temperature compressed gas from the gas compressor, the high-temperature and high-pressure gas of the gas compressor can conduct hot air purging on cold start of the fuel cell, low-temperature start of the PEM fuel cell is helped, and the fuel cell power generation efficiency is improved. And meanwhile, high-temperature and high-pressure air at the outlet of the compressor is humidified and cooled through cooling of liquid water, and the requirement for system accessories is simplified.

The invention discloses an electric bus charging and discharging combined scheduling method, and belongs to the field of intelligent bus scheduling. The method comprises the following steps: firstly, collecting an operation plan and time-of-use electricity price data of an electric bus, and then constructing an electric bus participation vehicle network integration charging and discharging scheduling model which comprehensively considers cost benefits; the model can decide the optimal charging and discharging strategy of each electric bus according to the operation plan and the residual electric quantity of the electric bus and the real-time electricity price of a power grid, so that the bus operation requirement is met, the charging at the electricity price valley period and the discharging at the electricity price peak period can be fully realized, and the charging and discharging efficiency is improved. Therefore, the charging cost is reduced and the electricity selling income is maximized. Through the method, the electric bus not only can meet the requirements of public transportation, but also can participate in peak load shifting of a power grid, efficient utilization of energy and maximization of economic benefits are achieved, and powerful technical support is provided for sustainable development of the electric bus.

The invention provides an electric motor coach whole vehicle OTA upgrading control method based on a BMS and a VCU, a temperature control dynamic threshold value and a multi-sensor weighted scoring algorithm are adopted, the BMS adaptively adjusts an SOC threshold value according to the battery temperature, the VCU synthesizes the vehicle speed, a hand brake and other states to generate upgrading condition evaluation, a user portrait database and a logistic regression model are combined, and the whole vehicle OTA upgrading control method based on the BMS and the VCU is obtained. Differentially pushing popup windows and predicting user cancel behaviors, implementing a block verification and low-temperature delay write-in strategy, dynamically optimizing remaining time display and low-bandwidth mode switching by a VCU, constructing a multi-stage rollback strategy library, automatically selecting a rollback path according to failure reasons, and cooperating with a safe restart mechanism of key state linkage; and in combination with NLP analysis user feedback driving system iteration, the low-temperature environment compatibility, the user interaction experience and the upgrading success rate are effectively improved, and a closed-loop optimized OTA upgrading ecological system is formed.

The invention provides a method and device for estimating the quality and speed of an electric motor coach and electronic equipment. The method comprises the steps that current operation parameters of the electric motor coach are obtained; based on the current operation parameters, a recursive least square method is combined with a pre-constructed longitudinal deviation dynamical model to conduct vehicle mass estimation, and mass estimation information of the electric motor coach is obtained; the longitudinal acceleration and the wheel rotating speed in the current operation parameters are preprocessed, and the calibrated acceleration and the wheel linear speed are obtained; the preprocessing comprises Hall effect coding processing of the wheel rotating speed and calibration processing of the longitudinal acceleration; and based on the calibration acceleration and the wheel linear speed, vehicle speed estimation is carried out by adopting a nonlinear digital hybrid filtering algorithm in the current state of the electric motor coach, and vehicle speed estimation information of the electric motor coach is obtained. The real-time estimation precision of the vehicle quality and the vehicle speed is improved, so that the response speed and reliability of a vehicle control system are improved, and the driving safety and stability of the electric motor coach under various complex road conditions are enhanced.

The present disclosure provides a coordinated and optimized dispatching method for electric buses and belongs to the technical field of smart buses. The present disclosure allows for comprehensive optimization of an electric bus dispatching strategy in time and space dimensions, establishment of a bi-level programming model for bus dispatching with consideration of a bus capacity, a transfer problem, and characteristics of electric buses, and solving of the model by a genetic algorithm. The present disclosure enables generation of a dispatching strategy for electric buses encompassing time and space aspects. The dispatching strategy is closer to an actual passenger flow situation and has better actual benefits.

The invention provides a multi-source data fusion driven electric bus battery SOC prediction method. According to the method, firstly, data preprocessing and feature extraction are performed on collected electric bus operation data, then, for the problem that a traditional model is insufficient in complex time sequence data feature extraction capability, on the basis of a TFT model, the time sequence feature learning advantage of an LSTM network is fused, an improved TFT model is constructed, and the time sequence feature extraction capability of the LSTM network is improved. The combined modeling capability of the model for short-term change and long-term dependence features is enhanced, and the improved TFT model can select and process extracted multi-dimensional data features. A prediction result of the improved TFT model is compared with an existing typical prediction model, and the prediction performance of the improved TFT model is superior to that of the existing prediction model on a plurality of evaluation indexes. The electric bus battery SOC prediction method provided by the invention has prediction stability and accuracy under complex charging and discharging working conditions, and provides technical support for energy consumption management and intelligent control of the electric bus.

The invention discloses a method and equipment for constructing a bus carbon emission factor library of unit passengers, and a medium. The method comprises the steps: obtaining a bus network, and estimating bus attribute parameters including the bus passenger capacity, the bus speed and the bus size; calculating an energy consumption factor, a fuel consumption factor, a fuel combustion carbon emission factor, a cold start carbon emission factor and / or a lubricant carbon emission factor of the bus so as to estimate direct carbon emission of the bus; calculating the total carbon emission of the corresponding oil well to oil tank stage of the bus, the carbon emission factor of the corresponding oil well to oil tank stage of the electric bus, the carbon emission factor of the whole life cycle of the bus and / or the infrastructure carbon emission factor of the bus so as to estimate the indirect carbon emission of the bus; and deriving individual-level, grid-level, region-level, link-level and line-level bus carbon emission factors according to the estimated direct and indirect carbon emission of the bus.

The invention provides a commercial electric bus operation scheduling method and system under vehicle-network combination, and belongs to the field of electric bus resource optimization configuration, and the method comprises the steps: building a coupling network model of a power distribution network and a traffic network and a corresponding bus timetable; constructing an electric bus fleet optimization problem model and a constraint condition model in the coupling network of the power distribution network and the traffic network; obtaining electricity price, bus battery parameters and service income; and based on the bus operation time table, inputting the electricity price, the electric bus parameters and the service income information into the electric bus fleet optimization problem model, solving to obtain the optimized operation parameters of the electric bus fleet and the scheduling parameters of the power distribution network, and obtaining an electric bus scheduling scheme. And meanwhile, the flexibility of a power grid and the operation benefit of an electric bus commercial fleet are improved.

A commercial vehicle, such as an electric bus, comprising at least one electrically driven axle having a transmission-motor unit associated with at least one wheel assembly. A motor of the transmission-motor unit comprises a stator and a rotor. The rotor is connected in a torque-transmitting manner to a respective wheel assembly via a transmission. The rotor has an overhung bearing, and the rotor is mounted by the bearing of the transmission.

The invention discloses a subway electric bus braking training system and method based on online fault diagnosis, the system comprises a fault injection system and a braking platform, the fault injection system comprises a fault operation platform, and the fault operation platform is used for sending a real object fault signal and a software simulation fault signal; the braking platform comprises a local console, and the local console is used for receiving the real object fault signals and the software simulation fault signals and controlling and executing real object fault actions and software simulation fault actions so as to achieve training of hardware braking faults and software braking faults of the subway electric passenger cars. According to the invention, the purpose of teaching and training metro workers can be achieved, and the comprehensive fault processing capability of the metro workers can be improved.

The invention discloses a real-time monitoring device for the state of a fastener of an electric passenger car, and solves the problem that the fastening stress of a bolt is inconvenient to monitor in real time in the prior art. The system comprises a bolt, and further comprises a fixing plate used for being connected with vehicle bottom equipment, an intelligent gasket arranged on the fixing plate and used for detecting the fastening stress of the bolt, a data transmission module arranged in the intelligent gasket and connected with a vehicle-mounted host, and an energy storage mechanism arranged in the intelligent gasket and connected with the intelligent gasket and the data transmission module. The bolt penetrates through the fixing plate and is connected with the vehicle bottom equipment, and the intelligent gasket is pressed on the fixing plate. The bolt fastening stress is monitored in real time through the intelligent gasket, data detected by the intelligent gasket is transmitted into the vehicle-mounted host through the data transmission module and displayed, and monitoring personnel can judge whether the bolt falls off or loosens in the using process according to the pressure data monitored by the pressure sensor.

The invention discloses a bus dynamic scheduling method and system based on vehicle management, and the method comprises the steps: building a scheduling environment simulation system through collecting the historical data and real-time data of the operation of an electric bus, automatically generating passenger travel information based on bus line data and historical passenger getting-on data, carrying out the modeling of the bus operation as a dynamic discrete process, and carrying out the real-time scheduling of the electric bus. Constraints such as vehicle availability and charging limitation are introduced, and a bus operation simulation environment close to reality is constructed; establishing a Markov decision process based on a scheduling simulation environment, and definitely defining vehicle availability management parameters in a state space and a reward function; a Rainbow DQN model is adopted for training, a scheduling strategy is continuously optimized according to environment feedback, a dynamic scheduling scheme is generated by utilizing the model obtained through training according to real-time data reasoning, the travel requirements of passengers and the operation benefits of a bus company are considered on the premise that the vehicle availability is met, and intelligent scheduling decision support is provided for management personnel.

A charging system includes: a power converter configured to receive power from an external power network to generate charging power for electric buses; power rails electrically connected to the power converter and installed at a predetermined height according to a layout of a garage; a first charging network configured to horizontally move above a floor in the garage along the electric power rails to upper sides of the electric buses to contact the electric buses; a second charging network electrically connected to the power converter and providing a charging zone on a bottom surface of the garage by reflecting the layout to contact the electric buses parked in the charging zone; and a station controller configured to control a charging sequence of the electric buses by analyzing position information of the electric buses and calculating a shortest movement path and a charging order of the first charging network.

The invention relates to a positioning unit (12) and a method for establishing an electrically conductive connection between a stationary charging station (10) and a vehicle (24), in particular an electric bus or the like, a contact device (15) having an electric charging contact (19) of the positioning unit being movable in relation to a charging-contact surface (21) and being contactable therewith by means of the positioning unit, the positioning unit having a positioning device (13) and a drive device (14) for driving the positioning device, the charging contact being able to be positioned between a contact position (18) for transmitting power and a retracted position for interrupting power transmission by means of the positioning device, the positioning unit comprising a cover device (25) having an apron (26), the apron surrounding at least sections, preferably the entirety of, the contact device and being movable towards the contact position.

The invention discloses an electric passenger car track detection method, which comprises the following steps of: starting initialization after a track detection host is electrified, entering a waiting state after completion, reading a tag ID, judging the tag ID, starting detection if the tag ID is started, and continuing to detect the tag ID if the tag ID is not started. The track detection host obtains the transverse / vertical acceleration of a vehicle through the triaxial accelerometer, obtains a line radio frequency tag signal through the radio frequency tag reader, and obtains and calculates track information through the inertial navigation device. And the synchronous controller outputs mileage information to the rail detection host after acquiring a signal of the speed sensor, and triggers the laser triangulation assembly to acquire steel rail profile data. The rail inspection host obtains the transverse / vertical acceleration, the track, the mileage and the steel rail profile information of the vehicle, and solves the geometric parameter data of the rail. The technical problems that an existing rail detection operation mode is low in operation efficiency, real-time online detection cannot be achieved, and detection line data cannot truly reflect line dynamic parameters in the running state of the electric passenger car can be solved.

A self-power-consumption power supply system suitable for a large energy storage power station comprises a low-voltage station power-consumption bus power distribution cabinet installed in a booster station power distribution room, the low-voltage station power-consumption bus power distribution cabinet is connected with at least one energy storage system local distribution box, and the energy storage system local distribution box is arranged on the ground of an energy storage area. The energy storage system local distribution box is connected with at least one dual-power-supply change-over switch, and one path of the dual-power-supply change-over switch is connected with an auxiliary transformer of the energy storage PCS and used as a normal power supply. The other path of the dual-power change-over switch is connected with a station power distribution box to serve as a standby power supply; and the dual-power change-over switch is positioned on the energy storage PCS equipment. According to the utility model, an affiliated transformer of energy storage PCS equipment is used as a main power supply, and electricity of a low-voltage station of an energy storage power station is used as a standby power supply. Wherein the standby power supply is reasonably provided with an on-site distribution box and a looped network circuit breaker box according to equipment arrangement and equipment grouping of the energy storage power station, so that the stability of self power utilization of the energy storage power station can be effectively ensured, and the workload of equipment and field installation is saved.

The invention belongs to the technical field of urban traffic management, and particularly relates to an electric bus cooperative scheduling method in a charging facility time-sharing sharing mode. The objective of the invention is to solve the problem that the existing method faces a single electric bus route, neglects the fluctuation of the charging demand of private cars in each time period, and is easy to cause low utilization rate caused by excessive charging facility distribution number in individual time periods, or long charging queuing time of private cars caused by insufficient charging facility distribution number. The method comprises the following steps: constructing a collaborative optimization model of a bus scheduling scheme and a charging facility sharing scheme based on the daily charging cost of an electric bus line and an expression of an estimated value of earnings obtained by sharing a charging pile to an electric car every day by a bus enterprise; solving the collaborative optimization model to obtain an optimal feasible solution and a corresponding objective function value; the optimal feasible solution comprises an electric bus scheduling scheme and a charging facility sharing scheme.

The invention belongs to the technical field of urban public transport management, and particularly relates to an electric public transport scheduling and charging scheduling method considering source-load double-side fluctuation. The objective of the invention is to solve the problems that a public transportation system has source-load double-side fluctuation due to the intermittency of existing source-side photovoltaic power generation and the randomness of load-side public transportation operation energy consumption, so that the charging demand and the power supply capacity in part of time periods are not matched, the operation task cannot be completed in time, and the energy storage utilization efficiency is low. The invention provides an electric bus scheduling and charging scheduling method considering source-load double-side fluctuation. The method comprises the steps of calculating bus battery remaining capacity based on an optimization time period; calculating the remaining capacity of the energy storage battery based on the remaining capacity of the bus battery; based on the bus battery remaining capacity and the energy storage battery remaining capacity, constructing a chance constraint planning model; and solving the opportunity constraint planning model to obtain an optimal feasible solution which comprises an electric bus scheduling and charging scheduling scheme.

The utility model relates to a special battery system heat management device for an electric bus, which comprises a vehicle-mounted liquid-cooled battery pack, a battery pack cooling pipeline system and a battery heat management unit, the battery heat management unit is fixed at a bus station or a charging station, the battery heat management unit comprises a constant-temperature water tank, and an evaporator and an electric heater are arranged in the constant-temperature water tank. An outlet pipeline of the evaporator is sequentially connected with a thermostatic expansion valve, an inverter compressor, a condenser, a liquid storage tank and a thermostatic expansion valve, and is connected with an inlet pipeline of the evaporator to form a closed loop; the quick connector is divided into a vehicle-mounted connecting end and a battery heat management unit connecting end, a liquid outlet and a liquid return port of the constant-temperature water tank are respectively connected with the vehicle-mounted connecting end, and a water inlet end and a water outlet end of the battery pack cooling pipeline system are connected with the battery heat management unit connecting end. According to the utility model, the weight of the whole vehicle can be effectively reduced, heat exchange can be continuously carried out on batteries of different vehicles, heat exchange can also be carried out on batteries of a plurality of vehicles simultaneously, and the utilization efficiency of a heat management device unit is improved.

The invention relates to a power supply device for a vehicle, in particular for a utility vehicle, such as an electric bus or an electric truck, comprising: at least one contact head (4) which can be brought into contact with a docking device (5) in order to form an electric connection; at least a first pivot arm (2) which is connected to the at least one contact head (4) and which can be rotatably connected to the vehicle (1); and a return device (15). According to the invention, the return device (15) is designed to abut against the at least first pivot arm (2) and to depart from the at least first pivot arm (2) with respect to a follower of the at least first pivot arm (2). As a result, a reliable return of the first pivot arm (2) can be achieved.

The invention discloses a running subway electric passenger car training system and method based on online fault setting. The running subway electric passenger car training system based on online fault setting comprises a fault injection system and a physical platform connected with the fault injection system. The fault injection system comprises a fault operation platform, and the fault operation platform is used for sending a real object fault signal and a software simulation fault signal; the physical platform comprises a console, and the console is used for receiving the physical fault signals and the software simulation fault signals and controlling and executing physical fault actions and software simulation fault actions so as to achieve training of hardware faults and software faults of the subway electric passenger car. According to the invention, the purpose of teaching and training metro workers can be realized, and the comprehensive fault processing capability of students is improved.

The invention relates to a positioning unit (10) and a method for establishing an electrically conductive connection between a stationary charging station and a vehicle, in particular an electric bus or the like, the positioning unit being designed so as to be disposable above a vehicle, an electric charging contact (11) of the positioning unit being movable in relation to a charging contact surface (13) of the vehicle and being contactable therewith by means of the positioning unit, the positioning unit having a positioning device (14) and a drive device (15) for driving the positioning unit, the charging contact being able to be positioned between a contact position for power transmission and a retracted position for power interruption by means of the positioning device. The drive device has a displacement drive (16) having a support means (17) coupled with the positioning unit, a traction force being able to be transmitted in such a manner to the positioning device using the support means (17) that the positioning device is moveable between the contact position and the retracted position by means of the displacement drive.

A power source assembly for an aeronautical vehicle includes a fuel cell module configured to provide a first direct current (DC) power output, a battery module configured to provide a second DC power output, a DC electric bus configured to provide a specified DC power output to a load, a multi-phase DC / DC converter including a plurality of converter units, and a controller operably coupled to the multi-phase DC / DC converter. The multi-phase DC / DC converter is configured to receive the first DC power output and the second DC power output and to provide the specified DC power output to the DC electric bus. The controller is configured to receive data indicative of the first DC power output and to control the plurality of converter units of the multi-phase DC / DC converter based on the received data to maintain the specified DC power output to the load.

The invention discloses an independent liquid-cooling liquid-heating system of a pure electric bus and a control method, and belongs to the technical field of electric buses. Comprising the steps that S1, a battery management system (BMS) obtains the temperature of a battery and judges whether liquid cooling and liquid heating are needed or not, if yes, a liquid cooling or liquid heating process S2 is executed, and if not, a self-circulation mode S3 is executed; s2, acquiring a liquid cooling liquid heat demand, starting a liquid cooling liquid heat system according to the liquid cooling liquid heat demand, and cooperatively executing a liquid cooling liquid heat flow by the battery management system and the independent heat management unit; and S3, obtaining a whole vehicle system state and a liquid-cooling liquid heat demand, and if no liquid-cooling liquid heat demand exists, executing self-circulation of the liquid-cooling liquid heat system by the battery heat management unit. Through unified control and management of liquid cooling and liquid heat, mutual exclusion management of liquid cooling and liquid heat of the battery is easily realized, and the problem that an existing power battery is attenuated due to temperature influence is solved.

A power source assembly (200, 300, 400) for an aeronautical vehicle (100), includes a fuel cell module (202, 302, 312, 402, 412) configured to provide a first direct current (DC) power output, a battery module (204, 304, 314, 404, 414) configured to provide a second DC power output, a DC electric bus (206, 306, 316, 406, 416) configured to provide a specified DC power output to a load (212, 324, 422), a multi-phase DC / DC converter including a plurality of converter units (214), the multi-phase DC / DC converter configured to receive the first DC power output from the fuel cell module (202, 302, 312, 402, 412) and the second DC power output from the battery module (204, 304, 314, 404, 414) and to provide the specified DC power output to the DC electric bus (206, 306, 316, 406, 416), and a controller (210, 310, 320, 410, 420, 600) operably coupled to the multi-phase DC / DC converter and configured to receive data (602D) indicative of the first DC power output, the controller (210, 310, 320, 410, 420, 600) configured to control the plurality of converter units (214) of the multi-phase DC / DC converter based on the data (602D) indicative of the first DC power output to maintain the specified DC power output to the load (212, 324, 422).

The invention discloses an electric bus station optimization scheduling method and system based on light storage and charging cooperation. The method comprises the following steps: acquiring parameters; according to the obtained parameters, an electric bus charging and discharging behavior model, a photovoltaic output model, an energy storage system operation model and a charging pile operation model considering a one-pile multi-gun sharing mode are established; by taking the minimization of the total operation cost of the station as a target and taking the established unit models as constraints, constructing an optical storage and charging integrated electric bus station optimization scheduling model, and solving to obtain a scheduling plan in the station; and issuing the solved scheduling plan to a station operation control system to generate a scheduling instruction and a charging and discharging instruction of the electric bus so as to realize cooperative scheduling of the station optical storage and charging resources. According to the method, the physical matching relation of the vehicle pile gun is depicted finely, the problem of symmetric solution space explosion caused by neglecting equipment homogenization in a traditional model is solved, and the solving efficiency and feasibility of a large-scale scheduling problem are remarkably improved.

The utility model provides a battery cover, a roof structure and an electric bus, and relates to the technical field of vehicles, the battery cover provided by the utility model comprises a cover body, a cover door, a supporting assembly and a waterproof assembly, access holes are formed in the two sides of the cover body in the width direction of the vehicle, the cover body comprises a skin and side decoration plates connected to the two sides of the skin in the width direction of the vehicle, the skin and the side decoration plates on the two sides are welded into a whole, the side decoration plates are connected with the supporting assembly, and the supporting assembly is used for being connected with a top cover of the vehicle; the cover door is rotationally connected to the access hole, and a waterproof assembly used for abutting against the cover door is arranged at the access hole. The battery cover provided by the utility model does not occupy a larger width space of a bus, and the convenience of battery installation and maintenance is improved.