Test apparatus and method for measuring battery management system state of energy estimation capability

Abstract

The application discloses a test device and method for measuring the energy state estimation capability of a battery management system, comprising a current simulation source, a plurality of single battery voltage simulation sources and a simulation energy calculation unit; the simulation energy calculation unit is used for calculating current values and voltage values, sending the current values to the current simulation source unit and sending the voltage values to the single battery voltage simulation source unit; the current simulation source unit is used for outputting simulation currents to the battery management system; the plurality of single battery voltage simulation source units are used for outputting simulation voltages of battery modules and battery clusters to the battery management system; and an estimation unit is used for calculating SOE values, comparing the calculated SOE values with set SOE values of the battery management system and judging whether the energy state of the battery management system meets the requirements. The application can test the SOE estimation capability of single batteries, the SOE estimation capability of battery modules and the SOE estimation capability of battery clusters and flow battery stacks.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of power energy storage and battery management, and particularly relates to a test device and method for measuring the energy state estimation capability of a battery management system. BACKGROUND

[0002] The battery state of charge (SOC) and the battery state of energy (SOE) are important parameters for characterizing the consistency and safety of a battery. The application of energy storage batteries in the electric vehicle industry is earlier than that in the power energy storage industry. In the electric vehicle industry and the early power energy storage industry, the estimated value of SOC is always used as the basis for judging the working state and safety state of a battery. However, with the development of the power energy storage industry, the increase in the application of large-scale energy storage connected to the power grid, and the standardization requirements of the power grid for the connected energy storage system and the internal battery and battery management system, the SOE battery energy state can better serve the power grid than the SOC battery state of charge, so that the energy storage system can more conveniently accept the management and dispatch of the power grid and safely and efficiently play a role in the power grid ecology. The battery management system has real-time estimation functions for the battery voltage, current, temperature, SOC and SOE in the energy storage application, and can perform on-off protection on the battery system according to these parameters, which is a safety guarantee for the operation of the energy storage system. In the past, people have focused on SOC in the research of the battery management system, and many methods have been formed for the estimation and testing of the SOC of the energy storage battery. However, there are few researches and applications on the estimation and testing methods of SOE.

[0003] When the battery management system is in the process of software research and development, product delivery, type test or operation calibration, it is necessary to test the SOE estimation accuracy thereof. The traditional testing method is to connect the battery management system to a real battery, then connect the battery management system to a battery charging and discharging device, input the charging and discharging working condition to the battery charging and discharging device, calculate the SOE value in the process of working condition cycle execution, discharge the battery after several working conditions are continuously operated, calculate the ratio of the discharge energy to the available battery energy, obtain the SOE real value, and compare the SOE real value with the calculated value of the battery management system to obtain the SOE estimation accuracy of the battery management system. The traditional method has the advantages that the test method can accurately measure the SOE estimation accuracy, but the test time is long and the manual operation intervention is more, which is not conducive to the efficient development and detection of products. SUMMARY

[0004] To overcome the problems in the prior art, the purpose of the present application is to provide a test device and method for measuring the energy state estimation capability of a battery management system, which can quickly detect the SOE estimation accuracy of the battery management system.

[0005] To achieve the above object, the technical scheme adopted by the present application is as follows:

[0006] A test device for measuring the energy state estimation capability of a battery management system, comprising a current simulation source, a plurality of single cell voltage simulation sources, a simulation energy calculation unit and an estimation unit;

[0007] The simulation energy calculation unit is configured to calculate the current value and the voltage value, send the current value to the current simulation source unit, and send the voltage value to the single cell voltage simulation source unit.

[0008] The current simulation source unit is configured to simulate the current according to the received current value and output the current to the battery management system.

[0009] The plurality of single cell voltage simulation source units are configured to simulate the voltage of the battery module and the battery cluster according to the received voltage value and output the voltage of the battery module and the battery cluster to the battery management system.

[0010] The estimation unit is configured to calculate the SOE value according to the current received by the battery management system and the voltage of the battery module and the battery cluster, compare the calculated SOE value with the set SOE value of the battery management system according to the industry standard, and determine whether the energy state of the battery management system meets the requirements.

[0011] Further, the test device comprises a curve database storage unit configured to store SOE time curves corresponding to different single cell powers, single cell current time curves and single cell voltage time curves, and the curve database storage unit is connected to the simulation energy calculation unit.

[0012] Further, the test device comprises a simulation power setting unit configured to send the set simulation power to the simulation energy calculation unit.

[0013] Further, the SOE time curves corresponding to different single cell powers include SOE time curves corresponding to different single cell charging powers and SOE time curves corresponding to different single cell discharging powers.

[0014] Further, the device further comprises a timing unit connected to the simulation energy calculation unit for timing the operating conditions.

[0015] Further, the device further comprises a simulation power setting unit connected to the curve database storage unit for setting the battery operating conditions.

[0016] A test method for measuring the energy state estimation capability of a battery management system, comprising the following steps:

[0017] Calculate the current value and the voltage value, send the current value to the current simulation source unit, and send the voltage value to the single cell voltage simulation source unit.

[0018] The system simulates current based on the received current value and outputs the current to the battery management system.

[0019] Based on the received voltage value, simulate the voltage of the battery module and battery cluster, and output the voltage of the battery module and battery cluster to the battery management system.

[0020] Based on the current received by the battery management system and the voltage of the battery modules and battery clusters, the SOE value is calculated. According to industry standards, the calculated SOE value is compared with the set SOE value of the battery management system to determine whether the energy state of the battery management system meets the requirements.

[0021] Furthermore, based on the current received by the battery management system and the voltages of the battery modules and battery clusters, the SOE value is calculated, including the following steps:

[0022] SOE value includes charging SOE accuracy and discharging-charging SOE accuracy;

[0023] Following simulated constant power charging, record one SOE every 1 minute of charging. 模拟 The value, after charging to the cutoff voltage, is the simulated battery state of energy (SOE) estimated by the battery management system. 测量 Values ​​and measurements of battery state of energy (SOE) 模拟 Compare the values, calculate the SOE accuracy at each point, and take the maximum value as the charging SOE accuracy.

[0024] Based on the simulated constant power discharge, one SOE is recorded every 1 minute of discharge. 模拟 The value, after discharging to the cutoff voltage, is the simulated battery state of energy (SOE) estimated by the battery management system. 测量 Values ​​and measurements of battery state of energy (SOE) 模拟 The values ​​are compared, the SOE accuracy at each point is calculated, and the maximum value is taken as the discharge SOE accuracy.

[0025] Furthermore, the charging SOE accuracy is calculated using the following formula:

[0026] ΔSOE 充电 =MAX|SOE 模拟 -SOE 测量 |

[0027] In the formula, ΔSOE 充电 For charging SOE accuracy, SOE 模拟 For simulating the battery's state of energy, SOE 测量 For measuring the battery's state of energy;

[0028] The accuracy of SOE discharge is calculated using the following formula:

[0029] ΔSOE放电 = MAX|SOE 模拟 -SOE 测量 |

[0030] In the formula, ΔSOE 放电 is the discharge SOE accuracy.

[0031] Further, the current value and the voltage value are calculated, the current value is sent to the current analog source unit, and the voltage value is sent to the single battery voltage analog source unit, including the following steps:

[0032] Under the constant power working condition, the simulation energy is calculated according to the SOE time curve corresponding to different single battery powers, the single battery current time curve and the single battery voltage time curve, the voltage value and the current value are obtained according to the simulation energy, the current value is sent to the current analog source unit, and the voltage value is sent to the single battery voltage analog source unit;

[0033] Under the variable power working condition, the variable power curve is segmented into constant power working condition curves, each constant power working condition curve is mapped to a known power curve, and then is split into a voltage time segmented curve and a current time segmented curve of the corresponding power curve, a voltage offset generated during power conversion is added to a transition section of the voltage time curve corresponding to the power conversion, a corrected voltage time curve is generated, the current time curve of the transition section is calculated according to the current time segmented curve under the constant power condition, a corrected current time curve is obtained, the current value and the voltage value are obtained according to the corrected current time curve and the corrected voltage time curve, the current value is sent to the current analog source unit, and the voltage value is sent to the single battery voltage analog source.

[0034] Compared with the prior art, the present application has the beneficial effects that:

[0035] The present application has higher flexibility and safety than the conventional method of testing the SOE estimation capability of the battery management system by using real batteries. The present application can input the curves of different batteries under the same charging and discharging power, and is good in battery adaptability for testing the energy state estimation capability of the battery management system. The present application can also input the curves of the same kind of batteries under different charging and discharging powers, and is good in working condition adaptability for testing the energy state estimation capability of the battery management system. The present application has the multi-channel control function by setting multiple single battery voltage analog source units, and can test the SOE estimation capability of the single battery, the SOE estimation capability of the battery module, and the SOE estimation capability of the battery cluster and the flow battery stack.

[0036] Further, the present application splits the arbitrary power simulation working condition into segmented constant power simulation working conditions, and corrects the corresponding voltage and current time curves in a certain period of time during the working condition switching, thereby improving the accuracy of the energy state estimation capability. BRIEF DESCRIPTION OF DRAWINGS

[0037] Figure 1 is a block diagram of the test device.

[0038] Figure 2 is a different power charging SOE time curve and corresponding current, voltage time curve stored in the curve database.

[0039] Figure 3 is a different power discharge SOE time curve and corresponding current, voltage time curve stored in the curve database.

[0040] Figure 4 is a SOE time curve and corresponding current, voltage time curve of the charging process under the variable power condition, wherein (a) is the SOE time curve of the charging process, (b) is the P1 corresponding voltage current time curve, (c) is the P2 corresponding voltage current time curve, and (d) is the Pn corresponding voltage current time curve.

[0041] Figure 5 is a SOE time curve and corresponding current, voltage time curve of the discharge process under the variable power condition, wherein (a) is the SOE time curve of the discharge process, (b) is the P1' corresponding voltage current time curve, (c) is the P2' corresponding voltage current time curve, and (d) is the Pn' corresponding voltage current time curve. DETAILED DESCRIPTION

[0042] The application will be described in detail below with reference to the accompanying drawings.

[0043] In the application, the terms are explained as follows:

[0044] SOC: State of Charge, battery state of charge;

[0045] SOE: Stete of Energy, battery energy state.

[0046] Battery cluster: a battery combination body formed by battery modules connected in series, parallel or series-parallel, and connected with energy storage converters and auxiliary facilities to realize independent operation, which also includes battery management systems, monitoring and protection circuits, electrical and communication interfaces and other components.

[0047] Battery module: a battery combination body formed by battery monomers connected in series, parallel or series-parallel, and having only one pair of positive and negative output terminals, which also includes a shell, management and protection devices and other components.

[0048] Battery management system: BMS, mainly used for real-time monitoring, fault diagnosis, SOC estimation, driving range estimation, short circuit protection, leakage monitoring, display alarm, charging and discharging mode selection and other parameters of electric vehicle power battery or power storage, and information interaction with vehicle integrated controller or charger through CAN bus, to ensure efficient, reliable and safe operation of electric vehicles.

[0049] Referring to Figure 1 The test device for measuring the energy state estimation capability of the battery management system comprises a current simulation source unit, a plurality of single cell voltage simulation source units, a timing unit, a simulation energy calculation unit, a curve database storage unit and a simulation power setting unit.

[0050] The simulation energy calculation unit is configured to calculate simulation energy according to the curves of the curve database storage unit under the set simulation power, and obtain current values and voltage values according to the simulation energy, and the simulation energy calculation unit is connected with the current simulation source and the single cell voltage simulation source, and sends the current values to the current simulation source unit and the voltage values to the single cell voltage simulation source unit.

[0051] The current simulation source unit is configured to simulate current according to the received current values and output the current to the battery management system.

[0052] The plurality of single cell voltage simulation source units comprise a single cell voltage simulation source unit 1, a single cell voltage simulation source unit 2, …, and a single cell voltage simulation source unit n, can independently control one single cell voltage simulation source unit output, or can select m single cell voltage simulation source units in series, and m is less than or equal to n; and are configured to simulate the voltage of the battery module and the battery cluster according to the received voltage, and output the voltage of the battery module and the battery cluster to the battery management system.

[0053] The curve database storage unit is configured to store SOE time curves corresponding to different powers of the battery module and the battery cluster (for example Figure 2 SOE time curves corresponding to charging powers P1, P2, …, Pn in the middle and Figure 3 SOE time curves corresponding to discharging powers P1', P2', …, Pn' in the middle), current time curves and voltage time curves corresponding to different powers of the battery module and the battery cluster.

[0054] The SOE time curves corresponding to different powers of the battery module and the battery cluster, the current time curves corresponding to different powers of the battery module and the battery cluster, and the voltage time curves corresponding to different powers of the battery module and the battery cluster are used to simulate the operating conditions of the battery, referring to Figure 2 SOE time curves corresponding to different charging powers and corresponding current and voltage time curves in the middle and Figure 3The SOE time curve of different power discharge and corresponding current and voltage time curve are stored in the curve database storage unit and connected with the simulation energy calculation unit.

[0055] The timing unit is used for timing the operation condition, and outputs a power value on the charge and discharge SOE time curve every time interval At, that is, a voltage and current value are outputted, and the duration of the charge and discharge SOE time curve is T, as shown in T1, T2, …, Tn in the figure. Figure 2 T1', T2', …, Tn' in the figure. Figure 3 T1', T2', …, Tn' in the figure.

[0056] The simulation power setting unit is used for setting the operation condition of the battery, and the setting of the operation condition is determined by power, time and step number, which can be constant power operation condition or variable power operation condition, and the simulation power setting unit is connected with the simulation energy calculation unit and the curve database storage unit.

[0057] The estimation unit is used for calculating the SOE value according to the current received by the battery management system and the voltage of the battery module and the battery cluster, and comparing the calculated SOE value with the set SOE value of the battery management system according to the industry standard to determine whether the energy state of the battery management system meets the requirements.

[0058] In the present application, for the constant power operation condition and the variable power operation condition, after the constant power operation condition is set by the simulation power setting unit, the set data is obtained through the simulation energy calculation unit and the curve database storage unit before the operation output, and the corresponding voltage value and current value are outputted by the current simulation source unit and the single battery voltage simulation source unit according to the voltage time curve and the current time curve. The voltage value and the current value outputted by the battery management system are collected, the SOE is calculated, and finally the SOE value calculated by the simulation charge and discharge energy of the test device is compared with the set SOE value of the battery management system, so that the SOE estimation accuracy of the measured battery management system can be obtained, and whether the energy state of the battery management system meets the requirements can be determined according to the industry standard.

[0059] The variable power condition setting can be completed by the analog power setting unit in the application. Before running the output, the variable power curve is first segmented into constant power condition curves, and then each constant power condition curve is mapped to the known power curve stored in the curve database storage unit. Each segmented power curve is further split into a voltage time segmented curve and a current time segmented curve corresponding to the power curve. The corresponding voltage curve transition section at the power switching place is added with the voltage offset generated during the power conversion to generate a corrected voltage time curve. The current time curve of the transition section is calculated under the constant power condition according to the current time segmented curve. The corrected current time curve and the corrected voltage time curve corresponding to the segmented constant power curve are obtained according to the corrected current time curve and the corrected voltage time curve, and the current and voltage are obtained as the corresponding output voltage and current. The battery management system collects the output voltage and current, calculates the SOE, and finally compares the SOE value calculated by the test device with the set SOE value of the battery management system to obtain the SOE estimation accuracy of the measured battery management system, and judges whether the energy state of the battery management system meets the requirements according to the industry standard.

[0060] Specifically, in the variable power condition, in the charging process, the analog power setting unit decomposes the variable power curve into OA, AB, …, CD, a total of n constant power curves, as shown in (a), (b), (c) and (d) in the figure. Figure 4 In the timing module, the P1 constant power curve time start point is 0 o'clock, and the end point is t1 o'clock; the P2 constant power curve start point is t1 o'clock, and the end point is t2 o'clock; …, the Pn constant power curve start point is tn-1 o'clock, and the end point is tn o'clock; the analog energy calculation unit finds the voltage and current time curve corresponding to P1 in the curve database storage unit, takes the time start point of the curve as 0 o'clock, and takes the time end point of the curve as t1 o'clock; the analog energy calculation unit sequentially finds the voltage and current time curve corresponding to P2 in the curve database storage unit, takes the time start point of the curve as t2' o'clock, and takes the time end point of the curve as t2" o'clock; …, the analog energy calculation unit sequentially finds the voltage and current time curve corresponding to Pn in the curve database storage unit, takes the time start point of the curve as tn' o'clock, and takes the time end point of the curve as tn" o'clock. Wherein:

[0061] P1 corresponding voltage and current time curve time start point: 0

[0062] P1 corresponding voltage and current time curve time end point: t1

[0063] P2 corresponding voltage and current time curve time start point:

[0064] P2 corresponds to the voltage-current time curve time endpoint:

[0065] …

[0066] Pn corresponds to the voltage-current time curve time start when n>2:

[0067] Pn corresponds to the voltage-current time curve time endpoint when n>2:

[0068] The voltage-current values of the curve interval between tn' and tn" are sequentially sent to the current simulation source and the single cell voltage simulation source.

[0069] Under the variable power working condition, the discharging process is the same as the charging process, which is specifically described in Figure 5 In (a) (b), (c) and (d), the test method for measuring the energy state estimation capability of the battery management system by using the above test device is determined, which includes the following steps:

[0070] Calculate the simulation energy and send it to the current simulation source and the single cell voltage simulation source unit;

[0071] Analog current according to the simulation energy, and output the current to the battery management system;

[0072] Analog the voltage of the battery module and the battery cluster according to the simulation energy, and output the voltage of the battery module and the battery cluster to the battery management system;

[0073] According to the current and the voltage of the battery module and the battery cluster received by the battery management system, calculate the SOE value, compare the calculated SOE value with the set SOE value of the battery management system according to the industry standard, and judge whether the energy state of the battery management system meets the requirements. Specifically, it includes the following steps:

[0074] 1) Select any SOE time curve corresponding to a charging power, select any SOE value as a set SOE value; simulate the constant power output charging and discharging working condition, cycle m times, and the last cycle working condition to the discharging cutoff.

[0075] 2) Again according to the simulation of constant power charging, specifically: according to the SOE time curve corresponding to the different single cell power, the single cell current time curve and the single cell voltage time curve, calculate the simulation energy, and send it to the current simulation source and the single cell voltage simulation source unit, analog current according to the simulation energy, output the current to the battery management system, analog the voltage of the battery module and the battery cluster, and output to the battery management system, according to the current and voltage received by the battery management system, charge.

[0076] Record one SOE value every 1 minute of charging 模拟 The SOE value estimated by the battery management system after charging to the cut-off voltage 测量 Compare the SOE value estimated by the battery management system after charging to the cut-off voltage 模拟 Calculate the SOE accuracy at each point, and take the maximum value as the charging SOE accuracy.

[0077] ΔSOE 充电 = MAX | SOE 模拟 - SOE 测量 |

[0078] In the formula, ΔSOE 充电 is the charging SOE accuracy, SOE 模拟 is the simulated battery state of energy, SOE 测量 is the measured battery state of energy.

[0079] 3) Select any SOE time curve corresponding to a discharge power, select any SOE value at a point, simulate the corresponding current and voltage values, simulate the constant power output charge and discharge working condition, cycle m times, and the working condition of the last cycle is charged to the cut-off.

[0080] 4) Discharge again according to the simulated power, specifically: according to the SOE time curve, the single cell current time curve and the single cell voltage time curve corresponding to different single cell powers, calculate the simulation energy, and send the simulation energy to the current simulation source and the single cell voltage simulation source unit, simulate the current according to the simulation energy, and output the current to the battery management system, simulate the voltage of the battery module and the battery cluster, and output to the battery management system, discharge according to the current and voltage received by the battery management system.

[0081] Record one SOE value every 1 minute of discharging 模拟 The SOE value estimated by the battery management system after discharging to the cut-off voltage 测量 Compare the SOE value estimated by the battery management system after discharging to the cut-off voltage 模拟 Calculate the SOE accuracy at each point, and take the maximum value as the discharging SOE accuracy.

[0082] ΔSOE 放电 = MAX | SOE 模拟 - SOE 测量 |

[0083] In the formula, ΔSOE 放电 is the discharging SOE accuracy.

[0084] According to the charging SOE accuracy and the discharging SOE accuracy, the calculated charging SOE accuracy and the discharging SOE accuracy are compared with the set charging SOE accuracy value and the discharging SOE accuracy value of the battery management system according to the industry standard. Specifically, whether the absolute value of the difference between the calculated charging SOE accuracy and the set charging SOE accuracy and the set charging SOE accuracy, and the absolute value of the difference between the calculated discharging SOE accuracy and the set discharging SOE accuracy and the set discharging SOE accuracy are both within 5%, if yes, it is judged that the measured battery management system energy state meets the requirements, otherwise, it does not meet the requirements.

[0085] Embodiment 1

[0086] In this embodiment, the simulation test device can select a 16-channel single voltage simulation source unit, the simulation voltage output range is 0-5V, the error is ±0.01%FS, the simulation current output range is -1000A-1000A, the error is ±0.3%FS, and the measurement accuracy is more accurate.

[0087] The battery management system collects the analog voltage and the analog current output by the single voltage simulation source, calculates the SOE, and finally compares the SOE value calculated by the simulation charging and discharging energy value of the test device with the set SOE value of the battery management system. According to the industry standard, it is judged whether the measured battery management system energy state meets the requirements.

Claims

1. A test apparatus for measuring the energy state estimation capability of a battery management system, characterized by, The test device comprises a current simulation source unit, a plurality of single cell voltage simulation source units, a simulation energy calculation unit, and an estimation unit. The simulation energy calculation unit is configured to calculate the current value and the voltage value, send the current value to the current simulation source unit, and send the voltage value to the single cell voltage simulation source unit. The current simulation source unit is configured to simulate the current according to the received current value and output the current to the battery management system. The plurality of single cell voltage simulation source units are configured to simulate the voltage of the battery module and the battery cluster according to the received voltage value and output the voltage of the battery module and the battery cluster to the battery management system. The estimation unit is configured to calculate the SOE value according to the current received by the battery management system and the voltage of the battery module and the battery cluster, compare the calculated SOE value with the set SOE value of the battery management system according to the industry standard, and determine whether the energy state of the battery management system meets the requirements. The calculation of the current value and the voltage value, the sending of the current value to the current simulation source unit, and the sending of the voltage value to the single cell voltage simulation source unit comprise the following steps: Under the constant power working condition, the simulation energy is calculated according to the SOE time curve corresponding to different single cell powers, the single cell current time curve, and the single cell voltage time curve, the voltage value and the current value are obtained according to the simulation energy, the current value is sent to the current simulation source unit, and the voltage value is sent to the single cell voltage simulation source unit. Under the variable power working condition, the variable power curve is segmented into constant power working condition curves, each constant power working condition curve is mapped to a known power curve and then split into a voltage time segmented curve and a current time segmented curve corresponding to the power curve, a voltage offset generated during power conversion is added to the transition section of the voltage time curve corresponding to the power conversion, a corrected voltage time curve is generated, the current time curve of the transition section is calculated according to the current time segmented curve under the constant power condition, a corrected current time curve is obtained, and the current value and the voltage value are obtained according to the corrected current time curve and the corrected voltage time curve, the current value is sent to the current simulation source unit, and the voltage value is sent to the single cell voltage simulation source unit.

2. The test device for measuring the state of energy estimation capability of a battery management system according to claim 1, characterized in that, The test device comprises a curve database storage unit configured to store the SOE time curve corresponding to different single cell powers, the single cell current time curve, and the single cell voltage time curve, and the curve database storage unit is connected to the simulation energy calculation unit.

3. The test apparatus for measuring the state of energy estimation capability of a battery management system of claim 1, wherein, The test device comprises a simulation power setting unit configured to send the set simulation power to the simulation energy calculation unit.

4. The test apparatus for measuring the state of energy estimation capability of a battery management system of claim 1, wherein, The SOE time curve corresponding to different single cell powers comprises an SOE time curve corresponding to different single cell charging powers and an SOE time curve corresponding to different single cell discharging powers.

5. The test apparatus for measuring the state of energy estimation capability of a battery management system of claim 1, wherein, The device further comprises a timing unit connected to the simulation energy calculation unit and configured to perform working condition operation timing.

6. The test apparatus for measuring the state of energy estimation capability of a battery management system of claim 1, wherein, The device further comprises a simulation power setting unit connected to the curve database storage unit and configured to set the battery running working condition.

7. A test method for measuring the energy state estimation capability of a battery management system, based on the test device for measuring the energy state estimation capability of a battery management system according to any one of claims 1 to 6, characterized in that, The calculation of the current value and the voltage value, the sending of the current value to the current simulation source unit, and the sending of the voltage value to the single cell voltage simulation source unit comprise the following steps: The current simulation source unit is configured to simulate the current according to the received current value and output the current to the battery management system. ​ According to the received voltage value, the voltage of the battery module and the battery cluster is simulated, and the voltage of the battery module and the battery cluster is output to the battery management system; According to the current received by the battery management system and the voltage of the battery module and the battery cluster, the SOE value is calculated, the calculated SOE value is compared with the set SOE value of the battery management system according to the industry standard, and it is judged whether the energy state of the battery management system meets the requirements; Wherein, the current value and the voltage value are calculated, the current value is sent to the current simulation source unit, and the voltage value is sent to the single battery voltage simulation source unit, including the following steps: Under constant power condition, according to the SOE time curve corresponding to different single battery power, the single battery current time curve and the single battery voltage time curve, the simulation energy is calculated, the voltage value and the current value are obtained according to the simulation energy, the current value is sent to the current simulation source unit, and the voltage value is sent to the single battery voltage simulation source unit; Under variable power condition, the variable power curve is segmented into constant power condition curve, then each segment of constant power condition curve is mapped to known power curve and then split into voltage time segmented curve and current time segmented curve corresponding to power curve, voltage offset generated at power conversion is added to the transition section of voltage time curve corresponding to power conversion, to generate corrected voltage time curve; the current time curve of the transition section is calculated according to the current time segmented curve under constant power condition, to obtain the corrected current time curve; the current value and the voltage value are obtained according to the corrected current time curve and the corrected voltage time curve, the current value is sent to the current simulation source unit, and the voltage value is sent to the single battery voltage simulation source unit.

8. The test method of measuring the state of energy estimation capability of a battery management system of claim 7, wherein, According to the current received by the battery management system and the voltage of the battery module and the battery cluster, the SOE value is calculated, including the following steps: The SOE value includes charging SOE accuracy and discharging SOE accuracy; Following simulated constant power charging, record one SOE every 1 minute of charging. 模拟 The value, after charging to the cutoff voltage, is the simulated battery state of energy (SOE) estimated by the battery management system. 测量 Values ​​and measurements of battery state of energy (SOE) 模拟 Compare the values, calculate the SOE accuracy at each point, and take the maximum value as the charging SOE accuracy. Record SOE every 1 minute discharge according to analog constant power discharge 模拟 Compare the battery management system estimated analog battery state of energy SOE 测量 value with the measured battery state of energy SOE 模拟 value, after discharging to the cut-off voltage, calculate the SOE accuracy at each point, and take the maximum value as the discharge SOE accuracy.

9. The test method of measuring the state of energy estimation capability of a battery management system of claim 8, wherein, The charging SOE accuracy is calculated by the following formula: ΔSOE 充电 = MAX | SOE 模拟 - SOE 测量 | where ΔSOE 充电 is the charging SOE accuracy, SOE 模拟 is the simulated state of energy of the battery, SOE 测量 is the measured state of energy of the battery; The discharging SOE accuracy is calculated by the following formula: ΔSOE 放电 = MAX | SOE 模拟 - SOE 测量 | where ΔSOE 放电 is the discharge SOE accuracy.

Images