Battery PACK simulator

Abstract

The utility model discloses a battery PACK simulator which comprises an upper computer, an MCU controller, a driving control board, a multi-cell cascade voltage simulation module, a multi-path NTC temperature simulation module and a PACK power simulation module. The upper computer communicates with the MCU controller and the driving control panel respectively; the multi-electric-core cascade voltage simulation module communicates with the MCU controller, and the output end of the multi-electric-core cascade voltage simulation module is connected with a multi-electric-core cascade voltage simulation interface; the multi-path NTC temperature simulation module communicates with the MCU controller, and the output end of the multi-path NTC temperature simulation module is connected with a multi-path NTC temperature simulation interface; the PACK power simulation module is communicated with the driving control board, and the output end of the PACK power simulation module is connected with a PACK power interface. According to the utility model, the battery PACK is completely simulated, the safety is high, the cost is low, the adjustability of voltage and NTC temperature simulation voltage values is strong, the cell equalization test is convenient, and the test efficiency of the energy storage system is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of energy storage, in particular to a simulation device of a battery module. Background Art

[0002] With the rapid development of the new energy storage industry, the application of energy storage-related products is becoming increasingly widespread. Energy storage PCS typically includes a battery energy storage system, an energy management system, and a power conversion system. The battery energy storage system stores electrical energy, the energy management system monitors and controls the storage and release of energy, and the power conversion system converts the DC power in the battery into AC power and vice versa.

[0003] One of the core components of an energy storage system is the battery. In the energy storage industry, multiple single cells are usually connected in series and packaged into a battery module, namely a battery PACK, to achieve the purpose of increasing the output voltage.

[0004] During the development of energy storage products, the battery management subsystem (BMS) collects the voltage of each single cell in the battery pack and multiple NTC voltages to conduct balancing experiments between the cells. The energy management system also connects to the battery pack power port to perform charge and discharge tests on the battery pack, typically with charge and discharge currents of tens or hundreds of amperes. Using a real battery pack for testing not only presents the disadvantages of bulkiness, poor safety, and high cost, but also slow voltage and temperature adjustment during testing, resulting in poor simulation of cell imbalance. Utility Model Content

[0005] The technical problem to be solved by the present invention is to provide a battery PACK simulator with high safety performance and low cost, so as to facilitate the rapid adjustment of voltage and temperature values during testing and the testing of battery cell balancing performance, further improve test efficiency and reduce test costs.

[0006] In order to solve the above technical problems, the technical solutions adopted by the present invention are as follows.

[0007] A battery pack simulator comprises a host computer, an MCU controller, a drive control board, a multi-cell cascade voltage simulation module, a multi-channel NTC temperature simulation module, and a pack power simulation module; the host computer communicates with the MCU controller and the drive control board respectively; the multi-cell cascade voltage simulation module communicates with the MCU controller, and the output end of the multi-cell cascade voltage simulation module is connected to a multi-cell cascade voltage simulation interface; the multi-channel NTC temperature simulation module communicates with the MCU controller, and the output end of the multi-channel NTC temperature simulation module is connected to the multi-channel NTC temperature simulation interface; the pack power simulation module communicates with the drive control board, and the output end of the pack power simulation module is connected to the pack power interface.

[0008] Preferably, the multi-cell cascade voltage simulation module includes multiple simulated cells, and each simulated cell is connected to the MCU controller and the multi-cell cascade voltage simulation interface respectively.

[0009] Preferably: the negative end of the cell voltage at the simulated cell output end is connected to the positive end of the cell voltage at the previous level simulated cell output end, and the positive end of the cell voltage at the simulated cell output end is connected to the negative end of the cell voltage at the next level simulated cell output end, thereby realizing cascade simulation of multiple cell voltages.

[0010] Preferably: the analog battery cell includes a signal and power isolation circuit, a digital-to-analog conversion circuit DAC and a conditioning circuit that are electrically connected in sequence. The signal and power isolation circuit is interconnected with the MCU controller, and the output end of the conditioning circuit is connected to a multi-battery cell cascade voltage analog interface.

[0011] Preferably: the analog cell also includes a sampling resistor connected in series between the negative end of the cell voltage at the analog cell output end and the multi-cell cascade voltage simulation interface, the sampling end of the sampling resistor is connected to the analog-to-digital conversion circuit ADC through the conditioning circuit, and the analog-to-digital conversion circuit ADC is connected to the signal and power isolation circuit.

[0012] Preferably, the multi-channel NTC temperature simulation module includes a multi-channel DAC-NTC simulation circuit, and the output end of the multi-channel DAC-NTC simulation circuit is connected to the multi-channel NTC temperature simulation interface.

[0013] Preferably: the PACK power simulation module is a three-phase bridge topology structure, including a three-phase bridge rectifier inverter circuit consisting of three IGBT upper and lower bridge arms, a direct voltage support capacitor and a BUCK-BOOST circuit, the AC side of the three-phase bridge rectifier inverter circuit is connected to the AC power grid, and the DC side of the three-phase bridge rectifier inverter circuit is connected to the PACK power interface via the BUCK-BOOST circuit; the direct voltage support capacitor is connected in parallel to the DC side of the three-phase bridge rectifier inverter circuit; the upper computer sends a PACK port voltage instruction to the drive control board, the drive control board generates an IGBT control signal to control the three-phase bridge rectifier inverter circuit to output a PACK signal, and the PACK signal is filtered by the BUCK-BOOST circuit and output to the PACK power interface.

[0014] Preferably: the PACK power simulation module is a single-phase bridge topology structure, including a single-phase bridge rectifier inverter circuit consisting of two IGBT upper and lower bridge arms, a direct voltage support capacitor and a BUCK-BOOST circuit, the AC side of the single-phase bridge rectifier inverter circuit is connected to the AC power grid, and the DC side of the single-phase bridge rectifier inverter circuit is connected to the PACK power interface via the BUCK-BOOST circuit; the direct voltage support capacitor is connected in parallel to the DC side of the single-phase bridge rectifier inverter circuit; the upper computer sends a PACK port voltage instruction to the drive control board, the drive control board generates an IGBT control signal to control the single-phase bridge rectifier inverter circuit to output a PACK signal, and the PACK signal is filtered by the BUCK-BOOST circuit and output to the PACK power interface.

[0015] Preferably, a Hall current sensor is further connected in series between the PACK power simulation module and the PACK power interface.

[0016] Due to the adoption of the above technical solution, the technical progress achieved by the present invention is as follows.

[0017] The utility model fully simulates the battery PACK and can provide a multi-cell cascade voltage simulation interface, a multi-channel NTC temperature simulation interface and a PACK power interface. The three interfaces can be used individually or in combination as needed. The host computer can control the independent output of the multi-cascade battery cell voltage and the independent output of the multi-channel NTC temperature simulation voltage. The current of each battery cell is collected by the module and uploaded to the host computer. The host computer controls the voltage change of each battery cell to simulate the balancing process between the battery cells. The host computer can also control the energy exchange between the PACK power simulation module and the AC power grid to realize the simulated charging and discharging process of the high-power current of the PACK. The utility model has the advantages of high safety, low cost, strong adjustability of the voltage and NTC temperature simulation voltage values, and convenient battery cell balancing test, thereby greatly improving the debugging and testing efficiency of the energy storage system. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural block diagram of the utility model;

[0019] Figure 2 This is a schematic diagram of the structure of the multi-cell cascade voltage simulation module and multi-channel NTC temperature simulation module circuit of the utility model;

[0020] Figure 3 This is a schematic diagram of the circuit structure of the three-phase bridge PACK power simulation module of the utility model;

[0021] Figure 4 This is a schematic diagram of the circuit structure of the single-phase bridge PACK power simulation module of the utility model. DETAILED DESCRIPTION

[0022] The present invention will be further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0023] Example 1

[0024] A battery PACK simulator, its structural block diagram is as follows Figure 1 As shown, it includes a host computer, an MCU controller, a drive control board, a multi-cell cascade voltage simulation module, a multi-channel NTC temperature simulation module, and a PACK power simulation module.

[0025] The multi-cell cascade voltage simulation module and the multi-channel NTC temperature simulation module share the MCU controller and are connected to the MCU controller through a control bus. Figure 2 As shown; the PACK power simulation module and the drive control board are connected through a control bus, as shown Figure 3 As shown, the drive control board and MCU controller communicate with the host computer through wired or wireless connections, and the wired method can be Ethernet or USB data cable.

[0026] The output end of the multi-cell cascade voltage simulation module is connected to the multi-cell cascade voltage simulation interface. The multi-cell cascade voltage simulation module includes multiple simulated cells, and each simulated cell is connected to the MCU controller and the multi-cell cascade voltage simulation interface respectively.

[0027] The structure of the simulated battery cell is as follows Figure 2 As shown, it includes a signal and power isolation circuit, a digital-to-analog conversion circuit DAC and a conditioning circuit that are electrically connected in sequence. The signal and power isolation circuit is interconnected with the MCU controller, and the output end of the conditioning circuit is connected to a multi-cell cascade voltage analog interface.

[0028] The host computer sends the power cell instruction to the MCU controller. The MCU controller controls the digital-to-analog conversion circuit DAC of each analog cell through the control bus to output the end cell voltage respectively. The end cell voltage is conditioned by the conditioning circuit and output to the multi-cell cascade voltage analog interface.

[0029] A sampling resistor R is connected in series between the negative end of the cell voltage at the analog cell output and the multi-cell cascade voltage simulation interface. The sampling end of the sampling resistor is connected to the analog-to-digital conversion circuit ADC via a conditioning circuit. The analog-to-digital conversion circuit ADC is connected to the signal and power isolation circuit. After conditioning by the conditioning circuit, signal conversion by the analog-to-digital conversion circuit ADC, and isolation processing by the signal and power isolation circuit, the terminal voltage signal of the sampling resistor is uploaded to the host computer via the MCU controller. The host computer adjusts the cell voltage output by each analog cell based on the balanced current between the analog cells and the battery characteristic curve.

[0030] In order to improve the diversity of output voltage in the present invention, each simulated battery cell in the multi-battery cell cascade voltage simulation module can be cascaded, that is: the negative end of the battery cell voltage at the simulated battery cell output end is connected to the positive end of the battery cell voltage at the previous level simulated battery cell output end, and the positive end of the battery cell voltage at the simulated battery cell output end is connected to the negative end of the battery cell voltage at the next level simulated battery cell output end, thereby completing the cascade simulation of multi-battery cell voltages.

[0031] In this embodiment, the multi-cell cascade voltage simulation module includes n simulated cells, such as Figure 2 As shown, the negative terminal GND0 of the output terminal cell voltage of the simulated battery cell 1 serves as the negative terminal of the cascaded battery cell, and the positive terminal of the output terminal cell voltage of the simulated battery cell 1 is connected to the negative terminal GND1 of the output terminal cell voltage of the simulated battery cell 2; the positive terminal of the output terminal cell voltage of the simulated battery cell 2 is connected to the negative terminal GND2 of the output terminal cell voltage of the simulated battery cell 3; and so on; the positive terminal of the output terminal cell voltage of the simulated battery cell n-1 is connected to the negative terminal GNDn-1 of the output terminal cell voltage of the simulated battery cell n, and the positive terminal of the output terminal cell voltage of the simulated battery cell n serves as the positive terminal of the cascaded battery cell to realize multi-cell cascading.

[0032] The simulated cell 1 outputs the cell voltage V0-V1 to the multi-cell cascade voltage simulation interface, the simulated cell 2 outputs the cell voltage V1-V2 to the multi-cell cascade voltage simulation interface, ..., the simulated cell n outputs the cell voltage Vn-1-Vn to the multi-cell cascade voltage simulation interface.

[0033] A sampling resistor R0 is connected in series between the negative end of the cell voltage at the output end of the analog cell 1 and the multi-cell cascade voltage analog interface, and the analog-to-digital conversion circuit ADC of the analog cell 1 collects the voltage between the sampling resistor R0 and the multi-cell cascade voltage analog interface as a basis for calculating the balanced current of the analog cell 1; a sampling resistor R1 is connected in series between the negative end of the cell voltage at the output end of the analog cell 2 and the multi-cell cascade voltage analog interface, and the analog-to-digital conversion circuit ADC of the analog cell 2 collects the voltage between the sampling resistor R1 and the multi-cell cascade voltage analog interface as a basis for calculating the balanced current of the analog cell 2; and so on; a sampling resistor Rn-1 is connected in series between the negative end of the cell voltage at the output end of the analog cell n and the multi-cell cascade voltage analog interface, and the analog-to-digital conversion circuit ADC of the analog cell n collects the voltage between the sampling resistor Rn-1 and the multi-cell cascade voltage analog interface as a basis for calculating the balanced current of the analog cell n.

[0034] The output end of the multi-channel NTC temperature simulation module is connected to the multi-channel NTC temperature simulation interface. The multi-channel NTC temperature simulation interface outputs NTC voltages corresponding to different temperatures under the instruction of the host computer through the MCU controller.

[0035] The multi-channel NTC temperature simulation module includes a multi-channel DAC-NTC simulation circuit, the output end of which is connected to the multi-channel NTC temperature simulation interface. The host computer sends an NTC voltage command to the MCU controller, and the multi-channel DAC-NTC simulation circuit outputs multiple NTC voltages to the multi-channel NTC temperature simulation interface under the control of the MCU controller. In this embodiment, the multi-channel DAC-NTC simulation circuit can output m NTC voltages N0-Nm, such as Figure 2 shown.

[0036] The PACK power simulation module includes a bridge rectifier inverter circuit, a direct voltage support capacitor, a BUCK-BOOST circuit and a PACK power interface. The PACK power interface outputs the PACK voltage under the instruction of the host computer through the drive control board.

[0037] In this embodiment, the PACK power simulation module is a three-phase bridge topology structure, such as Figure 3 As shown, the circuit includes a three-phase bridge rectifier inverter circuit consisting of three IGBT upper and lower bridge arms (IGBT1-IGBT6), a direct voltage support capacitor (C1), and a buck-boost circuit. The AC side of the three-phase bridge rectifier inverter circuit is connected to the AC three-phase grid, which provides energy exchange during the pack charge and discharge simulation. The DC side of the three-phase bridge rectifier inverter circuit is connected to the pack power interface via the buck-boost circuit. The direct voltage support capacitor (C1) is connected in parallel to the DC side of the three-phase bridge rectifier inverter circuit.

[0038] The BUCK-BOOST circuit includes two transistors IGBT7-IGBT8, an inductor L, and a capacitor C2. The controlled terminals of transistors IGBT7-IGBT8 are connected to the output terminal of the drive control board. The PACK signal output by the three-phase bridge rectifier inverter circuit can be amplified through the control of IGBT7-IGBT8, thereby increasing the adjustable range of the output voltage. Inductor L and capacitor C2 are used to filter the adjusted output voltage.

[0039] In the present invention, the output end of the PACK power simulation module is also connected in series with a Hall current sensor H to collect the output current. Figure 3 shown.

[0040] The host computer uses the multi-cell cascade voltage as the PACK port voltage instruction. The drive control board generates a three-phase bridge rectifier inverter circuit IGBT drive signal based on the PACK port voltage instruction issued by the host computer, driving the IGBT to output the instruction voltage. The output current collected by the Hall current sensor H is also uploaded to the host computer through the drive control board. The host computer calculates the battery state of charge (SOC) based on the output current collected by the Hall current sensor H and the battery characteristic curve, and adjusts the IGBT7-IGBT8 regulation instruction output to the BUCK-BOOST circuit. Finally, after filtering out harmonics, the PACK voltage is output to the PACK power interface. The drive control board collects the voltage at the PACK power interface as output negative feedback to improve output accuracy.

[0041] Example 2

[0042] The only difference between this embodiment and embodiment 1 is that the PACK power simulation module is a single-phase bridge topology structure, and the single-phase bridge rectifier inverter circuit is composed of two IGBT upper and lower bridge arms, such as Figure 4 shown.

Claims

1. A battery pack simulator, characterized by: The system comprises a host computer, an MCU controller, a drive control board, a multi-cell cascade voltage simulation module, a multi-channel NTC temperature simulation module and a PACK power simulation module; the host computer communicates with the MCU controller and the drive control board respectively; the multi-cell cascade voltage simulation module communicates with the MCU controller, and the output end of the multi-cell cascade voltage simulation module is connected to the multi-cell cascade voltage simulation interface; the multi-channel NTC temperature simulation module communicates with the MCU controller, and the output end of the multi-channel NTC temperature simulation module is connected to the multi-channel NTC temperature simulation interface; the PACK power simulation module communicates with the drive control board, and the output end of the PACK power simulation module is connected to the PACK power interface.

2. A battery pack simulator according to claim 1, characterized in that: The multi-cell cascade voltage simulation module includes multiple simulated cells, and each simulated cell is connected to the MCU controller and the multi-cell cascade voltage simulation interface respectively.

3. A battery pack simulator according to claim 2, characterized in that: The negative end of the cell voltage at the simulated cell output end is connected to the positive end of the cell voltage at the previous level simulated cell output end, and the positive end of the cell voltage at the simulated cell output end is connected to the negative end of the cell voltage at the next level simulated cell output end, thereby realizing cascade simulation of multiple cell voltages.

4. A battery pack simulator according to claim 2, characterized in that: The analog battery cell includes a signal and power isolation circuit, a digital-to-analog conversion circuit DAC and a conditioning circuit that are electrically connected in sequence. The signal and power isolation circuit is interconnected with the MCU controller, and the output end of the conditioning circuit is connected to a multi-battery cell cascade voltage analog interface.

5. A battery pack simulator according to claim 4, characterized in that: The analog cell also includes a sampling resistor connected in series between the negative end of the cell voltage at the analog cell output end and the multi-cell cascade voltage simulation interface. The sampling end of the sampling resistor is connected to the analog-to-digital conversion circuit ADC through the conditioning circuit, and the analog-to-digital conversion circuit ADC is connected to the signal and power isolation circuit.

6. A battery pack simulator according to claim 1, characterized in that: The multi-channel NTC temperature simulation module includes a multi-channel DAC-NTC simulation circuit, and the output end of the multi-channel DAC-NTC simulation circuit is connected to the multi-channel NTC temperature simulation interface.

7. A battery pack simulator according to claim 1, characterized in that: The PACK power simulation module has a three-phase bridge topology, including a three-phase bridge rectifier inverter circuit consisting of three IGBT upper and lower bridge arms, a direct voltage support capacitor, and a buck-boost circuit. The AC side of the three-phase bridge rectifier inverter circuit is connected to the AC power grid, and the DC side of the three-phase bridge rectifier inverter circuit is connected to the PACK power interface via the buck-boost circuit; the direct voltage support capacitor is connected in parallel to the DC side of the three-phase bridge rectifier inverter circuit.

8. The battery pack simulator according to claim 1, characterized in that: The PACK power simulation module has a single-phase bridge topology, including a single-phase bridge rectifier inverter circuit consisting of two IGBT upper and lower bridge arms, a direct voltage support capacitor, and a buck-boost circuit. The AC side of the single-phase bridge rectifier inverter circuit is connected to the AC power grid, and the DC side of the single-phase bridge rectifier inverter circuit is connected to the PACK power interface via the buck-boost circuit; the direct voltage support capacitor is connected in parallel to the DC side of the single-phase bridge rectifier inverter circuit.

9. The battery pack simulator according to claim 1, characterized in that: A Hall current sensor is further connected in series between the PACK power simulation module and the PACK power interface.

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