CN107202959A - One kind is used for battery pack and battery management system matching test centring system - Google Patents

Abstract

The invention discloses a matching test center system for battery packs and battery management systems, which belongs to the field of test technology. The center system includes four modules: battery performance test module, voltage, current and temperature accuracy test module, state of charge and Life state accuracy test module, fault diagnosis accuracy and response time test module; the system transmits data through TCP/IP and the hardware-in-the-loop test platform NI real-time simulator and the main control board of the battery management system, and can test the battery in the battery management system. Accuracy analysis of voltage, current and temperature acquisition can complete the analysis of battery state of charge and life state estimation accuracy, and also realize the judgment of fault diagnosis accuracy and response time in the battery management system; in addition, the system can also analyze the accuracy of different structures Test and analyze the performance of the battery pack to complete the matching research of the power battery and the battery management system, prolong the service life of the battery pack, and provide the possibility to improve the safety and reliability of electric vehicles.

Description

A matching test center system for battery packs and battery management systems

technical field

The invention relates to a test system, in particular to a matching test center system for a battery pack and a battery management system.

Background technique

With the energy crisis and the aggravation of environmental pollution, the electric vehicle industry, which has the dual advantages of energy saving and environmental protection, has been highly valued by the state and enterprises. As one of the core components of the electric vehicle power system, the power battery has a direct impact on the overall performance of the electric vehicle. At present, the research on key technologies such as modification of lithium-ion battery electrode materials and exploration of new material systems has made remarkable achievements. The specific energy and specific power of the battery have been improved to a certain extent, and the cycle life has reached thousands of times. Lithium, lithium sulfur, lithium air and other battery systems have also received extensive attention from domestic scholars. The main battery manufacturers include Japan Sanyo Electric Co., Ltd., Japan Sony Corporation, NEC Corporation, Korea Samsung SDI Corporation, Korea LG Corporation, BYD Co., Ltd., Tianjin Lishen Battery Co., Ltd., ATL Hong Kong New Energy Technology Co., Ltd., BAK Shenzhen BAK Battery Co., Ltd., Taiwan Nengyuan Technology Co., Ltd., A123 Company of the United States, etc.

In practical applications, power batteries are generally equipped with a battery management system. The battery management system estimates its internal state through real-time monitoring of battery voltage, current, and temperature to perform battery energy management, balance management, and thermal management. The performance of the battery pack is improved, and the cycle life of the battery pack is extended. The research on the battery management system of electric vehicles started earlier in foreign countries, and now a relatively complete technical system has been formed. General Motors of the United States has designed an intelligent battery management module system, which adopts a distributed method to collect battery state parameters and has functions such as automatic overcharge monitoring. The battery management system developed by Germany's Siemens takes the charging management of the battery pack as the core of the system's research; the battery management system developed by Japan's Honda mainly focuses on the use of safety, and designs an inertial control switch and a high-voltage system safety monitoring system. Domestic battery management system manufacturers mainly include Yineng, Ligao, Guantuo and Mogong. These products mainly realize the functions of battery pack status parameter monitoring, charge and discharge management, SOC/SOH estimation and external communication.

Looking at the current research work on batteries and management systems, the manufacturers and R&D manufacturers of batteries and their management systems are different. Domestic electric vehicle companies or battery companies focus on completing the design of battery packs and the integration with battery management systems through outsourcing and improvement. integration, did not carry out in-depth research on the characteristics of batteries and battery management systems, and did not carry out matching research on battery management systems for different battery pack structures. One of the reasons for the upper shadow.

Contents of the invention

In view of the above problems, the present invention proposes a battery pack and battery management system matching test center system, the central system can realize the characteristic test of the power battery pack and the battery management system, and provide guidance for the matching of the battery pack and the battery management system. Adopt the following technical solutions:

A matching test center system for battery packs and battery management systems, including:

Battery performance test module: refer to the national standard to formulate battery constant current/pulse/HPPC test plan, the central system transmits the current data in the test plan to the battery performance test bench through network communication, and the battery performance test bench completes relevant tests based on the received current data, and Collect voltage, current and temperature data under different working conditions, and establish surface functions between model parameters capacity, internal resistance, capacitance, open circuit voltage, etc. and temperature, state of charge and cycle coefficient based on the collected relevant data.

Voltage, current and temperature accuracy test module: the hardware-in-the-loop test platform and the main control board of the battery management system accept the settings of the battery management system measurement parameters voltage, current and temperature transmitted by the central system through network communication, and the hardware-in-the-loop test platform The reference settings of the programmable power supply and the analog output board output the battery voltage, current and temperature respectively; the voltage board and the current board in the battery management system respectively collect analog output such as voltage, temperature and current, and transmit the sampled values through CAN communication. It is transmitted to the main control board to analyze the difference between the collected amount and the set amount.

State of charge and life state accuracy test module: Based on the model parameter surface function established in the battery performance test module, the single battery simulation model is constructed with reference to the first-order RC equivalent circuit model, and the battery pack simulation model is established according to the actual battery pack topology; In the current and pulse test scheme, the current data is used as the model input parameter, and the battery voltage and temperature data under different working conditions are simulated, and the corresponding state of charge and life state are calculated, and transmitted to the main control board of the battery management system through network communication ;The hardware-in-the-loop test platform accepts the battery voltage, current and temperature data obtained by the simulation transmission on the network communication, and the programmable power supply and the analog output board output the voltage, current and temperature respectively; the voltage board and the current board in the battery management system respectively collect corresponding Simulate the output to estimate the state of charge and life of the battery, and transmit the estimated value to the main control board through CAN communication to compare and analyze the difference between the estimated value and the simulated value.

Fault diagnosis accuracy and response time test module: build a single battery simulation model based on the model parameter surface function established in the battery performance test module and refer to the first-order RC equivalent circuit model, and build a battery pack simulation model based on the actual battery pack topology; set Simulate the fault signal status of the single battery short circuit and open circuit in the battery pack model, and obtain the voltage and current data under different fault states; the hardware-in-the-loop test platform accepts the simulated voltage and current data transmitted by network communication, programmable power supply and analog output The boards output the voltage and current under different fault states; the voltage board and the current board in the battery management system collect corresponding analog quantities respectively, and the fault diagnosis accuracy and response time are obtained by comparing the simulated data with the collected data.

Beneficial effects of the present invention:

The present invention proposes a matching test center system for battery packs and battery management systems. The system can analyze the acquisition accuracy of battery voltage, current and temperature in the battery management system, and can complete the estimation accuracy of battery state of charge and life state. It can also realize the determination of fault diagnosis accuracy and response time in the battery management system; in addition, the system can also test and analyze the performance of different configurations of battery packs, so as to complete the matching research of power batteries and battery management systems, and prolong battery life. The service life of the group provides the possibility to improve the safety and reliability of electric vehicles.

Description of drawings

Figure 1 is a schematic diagram of the central system.

Figure 2 is a logical diagram of system communication.

detailed description

The present invention will be further described below in conjunction with the accompanying drawings and embodiments, but the protection scope of the present invention is not limited thereto.

As shown in Figure 1, the central system includes four modules, namely battery performance test module, voltage, current and temperature accuracy test module, state of charge and life state accuracy test module, and fault diagnosis accuracy and response time test module.

When in the state of battery performance testing, the central system communicates through TCP/IP, as shown in Figure 2, and transmits the current data of the battery constant current/pulse/HPPC test plan to the battery performance test bench, and the battery performance test bench is based on the received current Carry out related tests on the battery, and simultaneously collect battery voltage, current and temperature data; refer to the first-order RC equivalent circuit model to identify model parameters under different working conditions, and establish model parameters such as capacity, internal resistance, capacitance, and open circuit voltage The surface function between temperature, state of charge and cycle coefficient, the surface function fitting is optimized based on the least square surface function.

When analyzing the accuracy of voltage, current and temperature, the central system communicates through TCP/IP, as shown in Figure 2, and transmits the set values of the measured parameters voltage, current and temperature to the hardware-in-the-loop test platform NI real-time simulator and The main control board of the battery management system, the reference set value of the NI real-time simulator controls the programmable power supply and the analog output board to output the corresponding battery voltage, current and temperature analog values respectively; the voltage board and the current board in the battery management system collect voltage and temperature respectively And current and other analog output, and transmit the sampled value to the main control board through CAN communication, the main control board compares and analyzes the set value and sampled value to obtain the sampling accuracy of the voltage, current and temperature of the battery management system.

When the central system is running the state of charge and life state accuracy test module, build a single battery simulation model based on the model parameter surface function established in the battery performance test module and refer to the first-order RC equivalent circuit model, and build a battery pack simulation based on the actual battery pack topology Model; take the current data in the constant current and pulse test scheme as the model input parameters, simulate the battery voltage and temperature data under different working conditions, calculate the corresponding state of charge and life state, and transmit it to the battery through TCP/IP communication The main control board of the battery management system, see Figure 2 for the specific transmission process; the hardware-in-the-loop test platform accepts the simulated battery voltage, current and temperature data transmitted by TCP/IP communication, and the programmable power supply and analog output boards respectively correspond to voltage, Current and temperature analog quantities; the voltage board and current board in the battery management system respectively collect the corresponding analog output and estimate the state of charge and life of the battery at the same time, and then transmit the estimated quantity to the main control board through CAN communication to compare and analyze the estimated quantity and Difference between simulated values.

When testing the accuracy of fault diagnosis and response time, build a single battery simulation model based on the model parameter surface function established in the battery performance test module and refer to the first-order RC equivalent circuit model, and build a battery pack simulation model based on the actual battery pack topology ; The central system obtains the voltage and current data under different fault states by setting the fault signal status of the single battery short circuit and open circuit in the simulation model; the central system communicates through TCP/IP, see Figure 2, and transmits the corresponding data to the hardware in the Ring test platform NI real-time simulator, programmable power supply and analog output board based on this output voltage and current under different fault states; the voltage board and current board in the battery management system collect corresponding analog quantities, and transmit the collected data through CAN communication For the main control board, the main control board compares the simulation data with the collected data to obtain the accuracy and response time of the battery management system for fault judgment.

The series of detailed descriptions listed above are only specific descriptions for feasible implementations of the present invention, and they are not intended to limit the protection scope of the present invention. Any equivalent implementation or implementation that does not depart from the technical spirit of the present invention All changes should be included within the protection scope of the present invention.

Claims (4)

1. one kind is used for battery pack and battery management system matching test centring system, it is characterised in that including：Battery performance is surveyed Die trial block, voltage, electric current and temperature accuracy test module, state-of-charge and service life state accuracy test module, and failure are examined Disconnected accuracy rate and response time test module；

The battery performance test module：Battery constant current/pulse/HPPC testing schemes, the centring system is formulated with reference to national standard Current data in testing scheme is transferred to by battery performance test platform by network service, battery performance test platform is according to receiving Current data completes dependence test, and gathers voltage, electric current and temperature data under different operating modes, the related data based on collection Set up toroidal function between model parameter capacity, internal resistance, electric capacity, open-circuit voltage and temperature, state-of-charge and recycle ratio；

The voltage, electric current and temperature accuracy test module：Hardware-in―the-loop test platform and battery management system master control borad receive The set amount of battery management system measurement parameter voltage, electric current and temperature that the centring system passes through network communication and transmission, firmly Programmable power and analog output boardses reference settings amount of the part in ring test platform export cell voltage, electric current and temperature respectively Degree；Voltage plate distinguishes the imitated output quantities such as collection voltages, temperature and electric current with electric current plate in battery management system, and passes through CAN Sampled value is transferred to master control borad to analyze difference between collection capacity and set amount by communication；

State-of-charge and service life state the accuracy test module：Based on setting up model parameter curved surface in battery performance test module Function builds cell simulation model with reference to single order RC equivalent-circuit models, and battery is set up according to actual battery group topological structure Group simulation model；Using current data in constant current and pulse test scheme as mode input parameter, emulation is obtained under different operating modes Cell voltage and temperature data, calculating obtain corresponding state-of-charge and service life state, and it is given by network communication and transmission Battery management system master control borad；Hardware-in―the-loop test platform receives cell voltage, the electric current that Propagation Simulation in network service is obtained And temperature data, programmable power and analog output boardses difference output voltage, electric current and temperature；Voltage in battery management system Plate gathers corresponding imitated output quantity to electric current plate to estimate battery charge state and service life state respectively, and will by CAN communication Estimator is transferred to master control borad with difference between comparative analysis estimator and simulation value；

The fault diagnosis accuracy rate and response time test module：It is bent based on model parameter is set up in battery performance test module Surface function builds cell simulation model with reference to single order RC equivalent-circuit models, and electricity is set up according to actual battery group topological structure Pond group simulation model；The fault-signal state such as cell short circuit, open circuit in artificial battery group model is set, different faults are obtained Voltage and current data under state；Hardware-in―the-loop test platform receives the emulation voltage transmitted in network service and electric current number Export the voltage and electric current under different faults state respectively according to, programmable power and analog output boardses；In battery management system Voltage plate gathers corresponding analog quantity to electric current plate respectively, and it is accurate that the contrast by emulating data and gathered data obtains fault diagnosis Rate and response time.

2. it is according to claim 1 a kind of for battery pack and battery management system matching test centring system, its feature Be, during in battery performance test state, the centring system by TCP/IP communication, by battery constant current/pulse of formulation/ HPPC testing scheme current datas are transferred to battery performance test platform.

3. it is according to claim 1 a kind of for battery pack and battery management system matching test centring system, its feature It is, the toroidal function fitting is used to be optimized based on least square toroidal function.

4. it is according to claim 1 a kind of for battery pack and battery management system matching test centring system, its feature It is, communication mode and hardware-in―the-loop test platform NI real-time simulations machine and cell tube that the centring system passes through TCP/IP Reason systematic master control board is transmitted data.