CN106740227A - A kind of electronic railway carriage or compartment lorry battery bag control system and method - Google Patents

Abstract

The invention discloses a battery pack control system and method for an electric van. The system includes a battery pack control system, a vehicle monitoring system respectively connected to the battery pack control system, a motor controller, a display instrument, and a vehicle charger. The battery pack control system includes a battery pack control system main module and a slave control module, and the battery pack control system master module and the slave control module are connected through a CAN bus. The system also includes a total negative relay and a DC/DC relay respectively connected to the battery pack control system. The system also includes an insulation monitoring unit connected to the battery pack control system, and the insulation monitoring unit is arranged inside the battery box. The vehicle monitoring system includes a primary alarm unit and a secondary alarm unit.

Description

A battery pack control system and method for an electric van

technical field

The invention is applied to the field of pure electric vehicle battery packs, and in particular relates to a battery pack control system and method for electric vans.

Background technique

As the environmental pollution is becoming more and more serious, the country continues to introduce new energy-saving and emission-reduction policies. Pure electric vans are gradually occupying short-distance transportation due to their pollution-free, zero-emission, low-noise, high-efficiency operation, easy maintenance and strong support from national policies. , the market of urban logistics and transportation, and the life of the power battery pack is short and the replacement cost is high, which restricts the development of pure electric vans. While people are constantly improving the performance of the battery pack itself, they are also constantly researching and developing the battery pack control system. , to give full play to the performance of the battery pack and improve the efficiency and service life of the battery pack.

The existing battery pack control system lacks the analysis of the working state information of the battery, does not receive the fault information of each battery in time, and does not adopt a corresponding control method for the battery with the fault information.

Contents of the invention

According to the above deficiencies in the prior art, the technical problem to be solved by the present invention is to propose a battery pack control system and method for electric vans, which can improve the utilization rate of the battery, prevent overcharging and overdischarging of the battery, and prolong the service life of the battery , monitor the state of the battery

In order to solve the above technical problems, the technical solution adopted by the present invention is: a battery pack control system for electric vans, which includes a battery pack control system, an on-board monitoring system connected to the battery pack control system, a motor controller, and a display instrument , Vehicle charger. The battery pack control system includes a battery pack control system main module and a slave control module, and the battery pack control system master module and the slave control module are connected through a CAN bus. The system also includes a total negative relay and a DC/DC relay respectively connected to the battery pack control system. The system also includes an insulation monitoring unit connected to the battery pack control system, and the insulation monitoring unit is arranged inside the battery box. The vehicle monitoring system includes a primary alarm unit and a secondary alarm unit.

A monitoring method for a battery pack control system of an electric van, the method collects the voltage and temperature of each battery in the battery pack of an electric van in real time, the charging and discharging current, and the total voltage of the battery pack during the charging and discharging process of the battery, and gives Battery status, sorting out problematic batteries, and maintaining the reliability and efficiency of battery pack operation. According to the abnormal state of the battery pack, the method sends alarms to the vehicle in two levels according to the severity of the fault. In the case of the second level alarm, the motor controller performs power reduction operation according to the available charge and discharge current value; in the case of the first level alarm, Stop charging and discharging the battery to ensure the safe use of the power battery. In this method, after the electric van is started, the battery pack control system is powered on, and the battery pack control system controls the work of the pre-charging system to prevent instantaneous high current impact; Connectors and charging equipment for communication. In this method, during the operation of the vehicle, the battery pack control system can send the data of the vehicle operation to the motor controller; during the slow charging process of the battery pack, the battery pack control system communicates with the on-board charging equipment; The package control system communicates with the fast charging device. When the vehicle is charging, the battery pack control system receives the charging connection signal, the battery pack control system closes the total negative relay and sends a message to wake up the vehicle controller, the vehicle controller enters the charging mode, and controls the closing of the DC/DC relay to send the charging The connection and charging status messages are sent to the meter, and the meter displays the charging connection and charging status.

The beneficial effects of the present invention are: the present invention analyzes the health information of the power battery pack in time by monitoring the single voltage of the power battery pack, the total voltage of the system, the temperature and the current in real time, and prompts the system failure by means of an alarm in an abnormal state. corresponding control. The specific control method is to alarm the whole vehicle in two levels according to the severity of the fault according to the abnormal state of the battery pack. In the case of the second level alarm, the motor controller will perform power reduction operation according to the available charge and discharge current value; in the case of the first level alarm Next, stop charging and discharging the battery, ensure the safe use of the power battery, and effectively prolong the service life of the power battery pack. By monitoring the health information of the power battery in real time, the system will identify and classify early warnings, and the fault information is refined compared with the traditional management system. .

Description of drawings

The following is a brief description of the content expressed in the drawings of this specification and the marks in the drawings:

Fig. 1 is a schematic diagram of a battery pack control system according to a specific embodiment of the present invention.

Fig. 2 is a bus topology diagram of a battery pack system according to a specific embodiment of the present invention.

detailed description

Through the description of the embodiments below, the specific implementation of the present invention includes the shape, structure, mutual position and connection relationship between the various parts, the function and working principle of each part, the manufacturing process and the operation and use method of the various components involved. etc., to make further detailed descriptions to help those skilled in the art have a more complete, accurate and in-depth understanding of the inventive concepts and technical solutions of the present invention. As shown in Figures 1 and 2, a battery pack control system for electric vans includes a battery pack control system, an on-board monitoring system connected to the battery pack control system, a motor controller, a display instrument, and an on-board charger. The battery pack control system includes a battery pack control system main module and a slave control module, and the battery pack control system master module and the slave control module are connected through a CAN bus. Slave control modules 1 to 4 mainly control voltage measurement, temperature measurement, equalization management, thermal management and communication; the main control module mainly realizes circuits such as electrical control, current measurement, total voltage and insulation detection, and communication interface.

The system also includes a total negative relay and a DC/DC relay respectively connected to the battery pack control system. The system also includes an insulation monitoring unit connected to the battery pack control system, and the insulation monitoring unit is arranged inside the battery box. The vehicle monitoring system includes a primary alarm unit and a secondary alarm unit.

A monitoring method for a battery pack control system of an electric van, the method collects the voltage and temperature of each battery in the battery pack of an electric van in real time, the charging and discharging current, and the total voltage of the battery pack during the charging and discharging process of the battery, and gives Battery status, sorting out problematic batteries, and maintaining the reliability and efficiency of battery pack operation. According to the abnormal state of the battery pack, the method sends alarms to the vehicle in two levels according to the severity of the fault. In the case of the second level alarm, the motor controller performs power reduction operation according to the available charge and discharge current value; in the case of the first level alarm, Stop charging and discharging the battery to ensure the safe use of the power battery. In this method, after the electric van is started, the battery pack control system is powered on, and the battery pack control system controls the work of the pre-charging system to prevent instantaneous high current impact; Connectors and charging equipment for communication. In this method, during the operation of the vehicle, the battery pack control system can send the data of the vehicle operation to the motor controller; during the slow charging process of the battery pack, the battery pack control system communicates with the on-board charging equipment; The package control system communicates with the fast charging device. When the vehicle is charging, the battery pack control system receives the charging connection signal, the battery pack control system closes the total negative relay and sends a message to wake up the vehicle controller, the vehicle controller enters the charging mode, and controls the closing of the DC/DC relay to send the charging The connection and charging status messages are sent to the meter, and the meter displays the charging connection and charging status. The total negative relay is used to control all electrical loads on the electric van; the DC/DC relay is used for control during the charging process.

The battery control system of electric vans should realize the following functions: first, accurately estimate the remaining power of the power battery pack, ensure that the SOC is maintained within a reasonable range, and prevent damage to the battery due to overcharging or overdischarging, so as to predict the electric power at any time. How much energy is left in the energy storage battery of the van or the state of charge of the energy storage battery. Secondly, dynamically monitor the working status of the power battery pack. During the charging and discharging process of the battery, the voltage and temperature of each battery in the battery pack of the electric van, the charging and discharging current, and the total voltage of the battery pack are collected in real time to prevent the battery from being overcharged or overdischarged. At the same time, it can give the battery status in time, select the battery with problems, maintain the reliability and high efficiency of the battery pack operation, and make it possible to realize the remaining power evaluation model.

After the electric van is started, the battery pack control system (BCS) is powered on at the same time, and the BCS can control the operation of the pre-charging system to prevent instantaneous high current impact; by monitoring the working status of the power battery pack in real time, it can communicate with the motor controller and the vehicle control system. Connectors and charging equipment for communication. During the operation of the vehicle, the BCS can send the data necessary for the operation of the vehicle to the motor controller; during the slow charging of the battery pack, the BCS can communicate with the on-board charging equipment; during the fast charging of the battery, the BCS can realize The communication with the fast charging device enables the charging device to fully understand the current state of the battery and ensure the safety of charging. According to the abnormal state of the battery pack, the BCS can send alarms to the vehicle in two levels according to the severity of the fault. In the case of the second level alarm, the motor controller should perform power reduction operation according to the available charge and discharge current value; in the case of the first level alarm, Charging and discharging of the battery should be stopped.

1. Charging strategy:

1. The CC signal (charging connection confirmation) on the charging plug is received by the BCS.

2. When the vehicle controller is in sleep mode: BCS is powered on and wakes up, receives CC to confirm the charging status, and the BCS closes the total negative relay and sends a message to wake up the vehicle controller, the vehicle controller enters the charging mode, and Control and close the DC/DC relay, send charging connection and charging status messages to the meter, and the meter will display the charging connection and charging status.

3. When the vehicle controller is in power-on or driving mode: BCS sends a charging information message to the vehicle controller, and the vehicle controller exits the driving mode or power-on mode, enters the sleep mode and disconnects all high-voltage electrical components, Then enter the charging mode from the sleep mode, and control the closing of the DC/DC relay, send the charging connection and charging status messages to the meter, and the meter will display the charging connection and charging status.

4. Only need to confirm the charging connection, BCS sends the charging status, and the vehicle controller cannot enter the driving mode.

5. The BCS establishes real-time communication with the charging equipment. During the charging process, the BCS is responsible for real-time detection of the voltage, temperature and charging current of each battery module. When the battery temperature is greater than 45°C, charging is prohibited. During the charging process, when the voltage of any battery module exceeds 4.2V, the BCS sends a signal to notify the charging device to stop charging and cut off the relay. The response time requirement is ≤1 second. The single overvoltage, total voltage is too high, and the temperature is too high to respond to the second-level fault alarm. After the charger responds and handles it, it has not been dealt with and continues to upgrade to the first-level fault. After a delay of 3S, the main relay is directly cut off.

2. Discharge strategy:

1. When the car key is in the ACC or ON gear, the BCS is powered on and wakes up;

2. After waking up, the BCS receives the battery enable signal sent by the VCU, and the BCS closes the total negative relay in the battery box.

3. The internal insulation detection module of the battery box starts to work and sends the system insulation resistance value to the BCS. The BCS judges whether there is an insulation problem in the high-voltage circuit. If there is an insulation problem, the main negative relay is disconnected.

4. BCS collects battery temperature, voltage, current, SOC value, insulation resistance and insulation state, fault information and other content and sends them to the vehicle controller to judge the operation status and fault content, and the instrument displays the fault state and SOC value.

5. When the single undervoltage, low temperature, total voltage undervoltage secondary alarm, continue to send alarm faults waiting for the vehicle to respond to deal with, has not been processed until the first level of fault delay 3S, directly cut off the main relay.

3. Security protection parameters and related strategies

The present invention has been exemplarily described above, and it is obvious that the specific implementation of the present invention is not limited by the above-mentioned manner, as long as the various insubstantial improvements of the method concept and technical solutions of the present invention are adopted, or the present invention is implemented without improvement. The ideas and technical schemes directly applied to other occasions are within the protection scope of the present invention. The protection scope of the present invention should be determined by the protection scope defined in the claims.

Claims (10)

1. a kind of electronic railway carriage or compartment lorry battery bag control system, it is characterised in that the system include battery bag control system, respectively with Vehicle-mounted monitoring system, electric machine controller, display instrument, the Vehicular charger of battery bag control system connection.

2. electronic railway carriage or compartment lorry battery bag control system according to claim 1, it is characterised in that the battery bag control system System include battery bag control system primary module and from control module, battery bag control system primary module and from control module pass through CAN it is total Line is connected.

3. electronic railway carriage or compartment lorry battery bag control system according to claim 1, it is characterised in that the system also includes and electricity Always negative relay and DC/DC relays that pond bag control system is connected respectively.

4. electronic railway carriage or compartment lorry battery bag control system according to claim 1, it is characterised in that the system also includes and electricity The insulating monitoring unit of pond bag control system connection, insulating monitoring unit is arranged on inside battery case.

5. electronic railway carriage or compartment lorry battery bag control system according to claim 1, it is characterised in that the vehicle-mounted monitoring system Including primary alarm unit and second-level alarm unit.

6. the monitoring method of a kind of electronic railway carriage or compartment lorry battery bag control system according to claim 1, it is characterised in that should Method in battery charge and discharge process, the voltage of every piece of battery in the electronic railway carriage or compartment lorry battery bag of Real-time Collection and temperature, charge and discharge Electric current and battery bag total voltage, provide battery condition, keep battery bag reliability of operation and high efficiency.

7. the monitoring method of electronic railway carriage or compartment lorry battery bag control system according to claim 6, it is characterised in that the method According to the abnormality that battery bag works, alarmed to vehicle by failure seriousness point two-stage, in the case of secondary alarm, electricity Machine controller with charging and discharging currents value according to can carry out downrating；Under one-level alarm condition, stopping carries out charge and discharge to battery Electricity, it is ensured that the safe handling of electrokinetic cell.

8. the monitoring method of electronic railway carriage or compartment lorry battery bag control system according to claim 6, it is characterised in that the method After the startup of electronic railway carriage or compartment lorry, electricity in battery bag control system, battery bag control system control pre-charge system work prevents wink Between heavy current impact；By the working condition of real-time monitoring electrokinetic cell bag, set with electric machine controller, entire car controller, charging It is standby to be communicated.

9. the monitoring method of electronic railway carriage or compartment lorry battery bag control system according to claim 6, it is characterised in that the method In vehicle operation, the data that vehicle runs can be sent to electric machine controller by battery bag control system；In battery bag trickle charge During, battery bag control system is communicated with vehicle-mounted charging equipment；During battery fills soon, battery bag control system is filled with soon Device talk.

10. the monitoring method of electronic railway carriage or compartment lorry battery bag control system according to claim 6, it is characterised in that vehicle During charging, battery bag control system receives charging connection signal, and battery bag control system closure always concurrently deliver newspaper by negative relay Text wake up entire car controller, entire car controller enters charge mode, and controls closed DC/DC relays, send charging connection and Charged state message shows charging connection and charged state to instrument by instrument.