KR102059381B1 - Battery management system simulator and simulation system of battery management system - Google Patents

Abstract

According to one embodiment of the present invention, a BMS simulator may include: a control unit converting a control value of a controller into a signal form which a voltage simulation unit, a current simulation unit, a temperature simulation unit, an internal resistance simulation unit, and a ph simulation unit can recognize, and outputting the control value; a voltage simulation unit providing a voltage for testing battery management system (BMS) performance under control of the control unit; a current simulation unit providing current for testing BMS performance under control of the control unit; a temperature simulation unit providing the temperature for testing BMS performance under control of the control unit; an internal resistance simulation unit providing internal resistance of a battery for testing BMS performance under control of the control unit; a ph simulation unit providing ph of the battery for testing BMS performance under control of the control unit; and an evaluation unit evaluating a state of the battery based on at least one of voltage, current, temperature, internal resistance, and ph simulated by the voltage simulation unit, current simulation unit, temperature simulation unit, internal resistance unit, and ph simulation unit. According to the present invention, by using a converter and an amplifier to implement virtual source, costs for system implementation can be reduced by about 1/10 compared to a legacy system.

Description

BMS Simulator and BMS Simulation System {BATTERY MANAGEMENT SYSTEM SIMULATOR AND SIMULATION SYSTEM OF BATTERY MANAGEMENT SYSTEM}

TECHNICAL FIELD The present application relates to a BMS simulator and a BMS simulation system, and more particularly, to a BMS simulator and a BMS simulation system that enable performance evaluation of a BMS for various types of batteries.

In a hybrid electric vehicle, a battery system is composed of a battery that is responsible for direct energy input and output, a battery manager that performs algorithms for management and control, and peripheral systems such as wires and safety devices (BMS) that electrically connect each component. .

Battery Management System (BMS) is an essential element to improve mileage and safety through optimal battery control of electric vehicles, and battery management technology (BMS) can be divided into two types.

First, it can be divided into thermal management control that equally cools the battery that is weak against heat and realizes the same performance, and secondly, state of charge (SOC) control that determines each state of the battery and operates at the optimum efficiency point. .

Meanwhile, in the case of a company producing BMS, a test is required after mounting on a real battery in a reliability evaluation stage after product development and production, and a battery simulator manufacturing technology is required for this. The BMS simulator is used to provide SW development environment for ECU development of BMS and to provide virtual sources (voltage, current, temperature) for BMS performance test.

Therefore, the design and operation of the BMS simulator must comply with the given specifications and standards and must be implemented as a hardware in the loop (HIL) system because it must satisfy all the functional and non-functional requirements given in the execution.

However, the existing BMS simulator simulates a battery pack by connecting an expensive power supply in series to simulate a battery of a hybrid electric vehicle, and uses a general purpose input output bus (GPIB), which is a standard communication method with a computer. The simulator was developed using, but many problems occurred due to the limitations of the slow communication method and the enormous cost.

In addition, the existing BMS simulator has been developed to evaluate the performance of the BMS for a specific type of battery, such as lithium-ion battery, for example, there is a limit that can not support the performance evaluation of the BMS for various types of batteries.

Accordingly, there is a need in the art for a BMS simulator and a BMS simulation system that enable the performance evaluation of BMS for various types of batteries.

In order to solve the above problems, an embodiment of the present invention provides a BMS simulator.

The BMS simulator may include: a controller configured to convert a control value of the controller into a signal form recognizable by a voltage simulation unit, a current simulation unit, a temperature simulation unit, an internal resistance simulation unit, and a ph simulation unit; A voltage simulation unit providing a voltage for a BMS performance test under the control of the controller; A current simulation unit providing a current for BMS performance test under the control of the controller; A temperature simulation unit for providing a temperature for a BMS performance test under the control of the controller; An internal resistance simulation unit providing an internal resistance of a battery for BMS performance test under the control of the controller; A ph simulation unit providing hp of the battery for BMS performance test under the control of the controller; And evaluating a state of the battery based on at least one of voltage, current, temperature, internal resistance, and ph simulated by the voltage simulation unit, current simulation unit, temperature simulation unit, internal resistance simulation unit, and ph simulation unit. It may include wealth.

Another embodiment of the present invention provides a BMS simulation system.

The BMS simulation system includes a voltage simulation unit for converting a digital voltage into an analog voltage through a first DC-AC converter and then amplifying and outputting the analog voltage through an amplifier, and converting the digital voltage into an analog voltage through a second DC-AC converter. After that, the current simulation unit allows current to flow through the VI converter, and converts the digital voltage into an analog voltage through a third DC-AC converter, and then divides the voltage through the variable resistor and the reference resistor of the first VR converter. A temperature simulation unit to convert the digital voltage into an analog voltage through a fourth DC-AC converter, and then divide and output the voltage through a variable resistor and a reference resistor of the second VR converter, and a fifth DC. After converting the digital voltage to analog voltage through the AC converter, the voltage is divided through the variable resistor and the reference resistor of the third VR converter. And an FPGA for converting and outputting a ph simulation unit and a controller control value into a signal form recognizable by the voltage simulation unit, current simulation unit, temperature simulation unit, internal resistance simulation unit, and ph simulation unit. The voltage simulation unit, the current simulation unit, the temperature simulation unit, the internal resistance simulation unit, and the ph simulation unit to provide a voltage, current, temperature, internal resistance or ph for the battery management system (BMS) performance test, and simulated voltage A BMS simulator for evaluating the condition of the battery based on at least one of current, temperature, internal resistance, and ph; And a controller for generating and providing the controller control value for controlling at least one of an output voltage, a current, a temperature, an internal resistance, and a ph of the BMS simulator, and then monitoring the output of the BMS that is changed in response thereto. The controller and the FPGA may communicate with each other through an address extension method consisting of an address, data, and control bus.

In addition, the solution of the said subject does not enumerate all the characteristics of this invention. Various features of the present invention and the advantages and effects thereof may be understood in more detail with reference to the following specific embodiments.

According to an embodiment of the present invention, by implementing a virtual source using a converter, an amplifier, the system implementation cost can be reduced by about 1/10 compared to the existing system.

In addition, by using the address extension method, which is not the conventional system control method such as GPIB or serial interface method, the interface speed is reduced by about 1/1000 so that a speed of 1 msec can be realized for all channels within 10 μsec. Such a high control speed enables the BMS simulation system of the present invention to be applied to a high speed system having a minimum event time of 10 msec or less for monitoring the speed of the system using a CAN system.

In addition, by applying the method of actually supplying and measuring the current required for the shunt resistor for the current control, the actual simulation can be performed.

In addition, the BMS performance test is performed by simulating the internal resistance and ph of the battery in addition to the voltage, current and temperature of the battery, thereby enabling the performance evaluation of the BMS for various types of batteries.

1 is a diagram illustrating a BMS simulation system according to an embodiment of the present invention.
2 is a diagram illustrating an address extension method applied to a BMS simulation system according to an embodiment of the present invention.
3 is a diagram illustrating a detailed configuration of a BMS simulator according to an embodiment of the present invention.
4 is a view for explaining a BMS simulation method according to an embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. However, in describing the preferred embodiment of the present invention in detail, if it is determined that the detailed description of the related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted. In addition, the same reference numerals are used throughout the drawings for parts having similar functions and functions.

In addition, throughout the specification, when a part is 'connected' to another part, it is not only 'directly connected' but also 'indirectly connected' with another element in between. Include. In addition, the term 'comprising' of an element means that the element may further include other elements, not to exclude other elements unless specifically stated otherwise.

1 is a diagram illustrating a BMS simulation system according to an embodiment of the present invention.

As shown in FIG. 1, the BMS simulation system according to an embodiment of the present invention may include a BMS 100, a BMS simulator 200, and a controller 300.

The BMS 100 is one of the core parts of an electric vehicle and a large-capacity energy storage device, and adjusts the voltage and current of a battery pack connected to multiple cells, and performs functions such as overvoltage and overcurrent prevention.

The BMS simulator 200 serves to provide a virtual source for BMS performance test, etc., and may perform a desired function under all environments given to the actual electric vehicle.

In particular, the BMS simulator 200 according to an embodiment of the present invention is designed to perform five functions of providing an internal resistance and a ph source in addition to a virtual voltage, current, and temperature source. Here, the cell voltage source function for voltage control converts a 16-bit data signal input from the controller 300 into an analog voltage signal through a DC-AC converter, and then amplifies the voltage signal through a voltage amplifier to perform a BMS (100). Is implemented by printing In addition, the cell current source function, the cell temperature source function, the cell internal resistance source function, and the cell ph source are implemented by converting a physical quantity into a voltage value through a precision resistance circuit and outputting the same.

The BMS simulator 200 is required to output a high voltage series voltage, and in order to implement it more quickly and efficiently, as shown in FIG. 2, an application of a digital isolation circuit (ISO, isolator) and a control logic (FPGA) using an FPGA The accuracy is improved by using DC-DC converter. In order to effectively control this, an address extension method consisting of an address (ADD), data (DATA), and control (CTRL) bus is applied.

In addition, the BMS simulator 200 may evaluate and provide a state of the battery based on the simulated voltage, current, temperature, internal resistance, and ph source information. For this, the BMS simulator 200 may be configured to hold reference information for evaluating the state of the battery. do.

The controller 300 serves to control and monitor the voltage, current, temperature, internal resistance, ph, etc., between the BMS simulator 200 and the BMS 100 properly. Communication with the BMS simulator 200 is made through address expansion, and the cell can increase or decrease the quantity as needed. To flexibly respond to this, each BMS simulator 200 includes a plurality of (eg, five) voltage sources, current sources, temperature sources, internal resistance sources, and ph sources. In addition, a back plane and a system bus are configured to effectively add the system of the present invention.

The controller 300 may include an FPGA program, a Real-Time Target (RT) program, and a Windows Host program.

The FPGA program includes an address set bit having information about a cell to be performance tested, a data set bit having information about a virtual source control value to be applied to a cell to be tested, read, write, Or it was developed to control the control bit to command the initialization operation. All algorithms are structured to be used as a function.

The Windows Host program has functions to read predefined and registered simulation scenarios from a file, and the provided functions provide automatic mode for the simulation according to the read simulation scenario and user's desire. It has a manual mode that allows you to control the voltage of the cell, thus diversifying its functionality for use in precision simulation as well as in production mode.

In addition, by providing a graphical user interface (GUI) that supports data input / output operations, the user requests a simulation operation or selects and adjusts various control parameters, and visually displays the simulation operation result to the user.

3 is a diagram illustrating a detailed configuration of a BMS simulator according to an embodiment of the present invention.

Referring to FIG. 3, the BMS simulator 200 according to an embodiment of the present invention is implemented in the form of a PCB board, and includes a control unit 210, a voltage simulation unit 220, a current simulation unit 230, and a temperature simulation unit ( 240, an internal resistance simulation unit 250, a ph simulation unit 260, and an evaluation unit 270 may be configured.

The control unit 210 is implemented in the form of an FPGA chip mounted on a PCB board, according to the control signal (especially data) provided from the controller 300, the voltage simulation unit 220, the current simulation unit 230, the temperature simulation unit 240, the internal resistance simulation unit 250, and the ph simulation unit 260 are controlled. That is, the controller 210 controls the control value of the controller 300 in the voltage simulation unit 220, the current simulation unit 230, the temperature simulation unit 240, the internal resistance simulation unit 250, and the ph simulation unit ( 260 converts the signal into a signal form that can be recognized and outputs the converted signal.

The voltage simulation unit 220 converts the digital voltage output from the control unit 210 through the DC-AC converter 221 into an analog voltage, and then amplifies the digital voltage through the amplifier 222 to the BMS 100. Will output The voltage simulation unit 220 is designed to overlap the voltage output up to 400V, it may have a specification as shown in Table 1.

Voltage range 0 ~ 5V Programmable Current range 0 to 200 mA Cell count 40 Total voltage range 0 to 200 V

In addition, the voltage simulation unit 220 blocks the voltage interference at the board level using the ISO 251 as described above, and improves the control accuracy by using the DC-DC converter 261.

The current flowing in the cell in the current simulation unit 230 flows through a shunt resistor mounted therein, and the current flowing in the shunt resistor generates a voltage. The current simulation unit 230 flows the current generated by the DC-AC converter 231 to the sensing resistor through the V-I converter 232 so that the current flows in the BMS 100. The current simulation unit 230 also protects the board through the ISO 252, minimizes interference, and increases the control precision through the DC-DC converter 262.

Table 2 shows examples of specifications of the current simulation section of the present invention.

Shunt resistance 50mV / 200mA (0.25ohm) Current amplification factor x 100 (OPTIONAL) Current range 0-5V (200mA)

The temperature generated in the cell in the temperature simulation unit 240 is built-in thermistor to monitor the temperature change of the BMS (100) by the resistance change of the thermistor. The temperature simulation unit 240 is provided with a variable resistor for sensing the temperature, by virtually converting the variable resistor (for example, 0-100KΩ resistance), it is possible to simulate the temperature of the BMS (100) virtually . At this time, the thermistor shows the temperature by the voltage divider resistance.

The output voltage of the temperature simulation unit 240 is determined as a ratio of a reference resistance and a variable resistance (that is, thermistor simulation resistance), and is converted into temperature based on the measured voltage to react. The DC-AC converter 241 converts the digital voltage output from the control unit 210 into an analog voltage, and the output voltage of the DC-AC converter 241 is divided by the variable resistor and the reference resistor to output the voltage (ie, And a VR converter 242 for generating a voltage change corresponding to the temperature change. Of course, the ISO 253 and the DC-DC converter 263 are also provided at the front end of the temperature simulation unit 240 to block the voltage interference at the board level and to increase the control accuracy.

Table 3 shows the specification example of the temperature simulation part of this invention.

Variable resistor 0-100K resolution 10 bit

The internal resistance simulation unit 250 monitors the internal resistance of the BMS 100 by the resistance change of the battery equivalent circuit. In this regard, the internal resistance simulation unit 250 includes a variable resistor for detecting internal resistance, and virtually converts the variable resistor, thereby enabling a virtual simulation of the internal resistance of the BMS 100.

The output voltage of the internal resistance simulation unit 250 is determined as a ratio of a reference resistance and a variable resistance (that is, simulation internal resistance), and may simulate the internal resistance based on the measured voltage. The DC-AC converter 251 converts the digital voltage output from the controller 210 into an analog voltage, and the output voltage of the DC-AC converter 251 is divided by the variable resistor and the reference resistor to output the voltage. And a VR converter 252 for generating a voltage change corresponding to the internal resistance. Of course, the ISO 254 and the DC-DC converter 264 are also provided at the front end of the internal resistance simulation unit 250 to block the voltage interference at the board level and to increase the control precision.

The ph simulation unit 260 monitors the ph of the BMS 100 by changing the resistance of the internal resistance of the cell. In this case, the ph simulation unit 260 includes a variable resistor for detecting a ph and virtually converts the variable resistor, thereby enabling a virtual simulation of the ph of the BMS 100. In addition, the ph simulation unit 260 is configured to perform temperature compensation to compensate for the potential change according to the temperature.

The output voltage of the ph simulation unit 260 is determined as a ratio of the reference resistance and the variable resistance (that is, the simulation ph), and is converted into ph through the temperature compensation based on the measured voltage to react. The DC-AC converter 261 converts the digital voltage output from the controller 210 into an analog voltage, and the output voltage of the DC-AC converter 261 is divided by the variable resistor and the reference resistor to output the voltage. and a VR converter 262 for generating a voltage change corresponding to the pH change. Of course, an ISO 255 and a DC-DC converter 265 are also provided at the front end of the ph simulation unit 260 to block the voltage interference at the board level and to increase the control precision.

The evaluation unit 270 is a cell voltage and current simulated by the voltage simulation unit 220, the current simulation unit 230 and the temperature simulation unit 240, the internal resistance simulation unit 250, and the ph simulation unit 260. Evaluate the condition of the battery based on at least one of temperature, internal resistance, and ph. To this end, the evaluation unit 270 is configured to hold reference information for evaluating the state of the battery.

For example, the evaluation unit 270 calculates an electrolyte specific gravity value based on the ph simulated by the ph simulation unit 260, and calculates a state of the battery, that is, a state of charge of the battery from the calculated specific gravity value of the electrolyte. Can be implemented to evaluate SOC). Here, since the specific gravity value of the electrolyte has a characteristic that changes according to the internal temperature of the cell, the evaluation unit 270 is configured to correct the error in consideration of the temperature characteristic of the cell.

The electromotive force of the lead-acid battery changes linearly according to the specific gravity value of the electrolyte as shown in Equation 1. Where S is the electrolyte specific gravity and E is the electromotive force.

[Equation 1]

S = E-0.85

In general, the specific gravity of a lead-acid battery varies by about 0.2 from the temperature of the electrolyte to the state of 100% discharge from the fully charged state at 20 ° C. Thus, the electrolyte specific gravity equation corrected based on the temperature of 20 ° C is used as shown in Equation 2. . Here, S ₂₀ is the specific gravity at 20 ° C., S _t is the specific gravity at t ° C., t is the temperature of the electrolyte, and 0.0007 is the temperature coefficient according to the change in temperature.

 [Equation 2]

When the SOC evaluation equation is expressed using the temperature correction equation, it may be expressed as Equation 3.

[Equation 3]

As another example, the evaluation unit 270 may be implemented to evaluate the state of the battery based on reference information from the internal resistance simulated by the internal resistance simulation unit 250.

The BMS simulator 200 configured as described above may be integrated into one PCB and be implemented to simulate a plurality of cells (for example, five). It also allows multiple boards to be connected in series. At this time, the number of boards that can be connected in series may be adjusted according to the maximum simulation voltage.

In addition, in the present invention, the voltage limiting unit 220, the current simulation unit 230 and the temperature simulation unit 240, the internal resistance simulation unit 250, and the ph simulation unit 260, respectively, at the final output terminal of the current limiting circuit ( By adding not shown, it is possible to protect the circuit from the external load (ie, disturbance).

4 is a view for explaining a BMS simulation method according to an embodiment of the present invention, hereinafter will be described only for the case of controlling the output voltage of the BMS simulation for convenience of description.

If the user requests the BMS simulation operation through the GUI of the controller 300 (S410), the controller 300 first checks the operation mode of the BMS simulation (S420).

As a result of checking in S420, if the operation mode of the BMS simulation is an automatic mode, a pre-registered BMS simulation scenario is called up (S430), and accordingly the output voltage of the BMS simulator 200 is controlled (S440). For example, to check the output precision of each cell, select multiple cells connected to the BMS simulation sequentially and select 5V, 4.5V, 4V, 3.5V, 3V, 2.5V, 2V, 1.5V, The output voltage of the BMS simulator 200 may be controlled by applying a voltage in the order of 1V and 0.5V.

In addition, after measuring the voltage output by the BMS 100 in response to each of the output voltages of the BMS simulator 200 (S450), the controller 300 displays the audiovisually through the GUI (S490). However, the controller 300 of the present invention may have various notification methods such as simply displaying the output voltage of the BMS 100 or calculating and displaying an error degree by comparing the input voltage with the output voltage. In addition, a control value for correcting the degree of error may be calculated, and subsequent operations such as controlling the BMS simulator 200 again may be additionally performed.

On the other hand, if it is confirmed in S420 that the operation mode of the BMS simulation is the manual mode, the controller 300 allows the user to input the BMS simulator control value through the GUI. When the user manually inputs the BMS simulator control value (S460), in response to the control of the output voltage of the BMS simulator 200 (S470), by measuring the voltage output by the BMS 100 in real time (S480), Through the GUI of the controller 300 is displayed visually (S490). In this case, the controller 300 and the BMS 100 may connect and communicate with a controller area network (CAN) which is a conventional vehicle communication method.

In addition, the BMS simulation system may test the performance of the BMS 100 while varying the output current, temperature, internal resistance, and ph inputted to each cell through the BMS simulator 200 in the same manner.

The present invention is not limited by the above-described embodiment and the accompanying drawings. It will be apparent to those skilled in the art that the present invention may be substituted, modified, and changed in accordance with the present invention without departing from the spirit of the present invention.

100: BMS
200: BMS simulator
210: control unit
220: voltage simulation unit
230: current simulation unit
240: temperature simulation unit
250: internal resistance simulation unit
260: ph simulation unit
270: evaluation unit
300: controller

Claims (5)

A control unit for converting a control value of the controller into a signal form recognizable by a voltage simulation unit, a current simulation unit, a temperature simulation unit, an internal resistance simulation unit, and a ph simulation unit;
A voltage simulation unit providing a voltage for a BMS performance test under the control of the controller;
A current simulation unit providing a current for BMS performance test under the control of the controller;
A temperature simulation unit for providing a temperature for a BMS performance test under the control of the controller;
An internal resistance simulation unit providing an internal resistance of a battery for BMS performance test under the control of the controller;
A ph simulation unit for providing a ph of the battery for BMS performance test under the control of the controller; And
An evaluation unit evaluating a state of a battery based on at least one of voltage, current, temperature, internal resistance, and ph simulated by the voltage simulation unit, current simulation unit, temperature simulation unit, internal resistance simulation unit, and ph simulation unit. Include,
The voltage simulation unit may include: a first DC-AC converter configured to digital-analog convert an output voltage of the controller; And an amplifier amplifying an output voltage of the first DC-AC converter and providing the amplified voltage to the BMS.
The current simulation unit includes a second DC-AC converter for digital-analog converting the output voltage of the controller; And a VI converter configured to voltage-current convert an output voltage of the second DC-AC converter to flow a current through a sensing resistor, thereby flowing a current in the BMS.
The temperature simulation unit includes a third DC-AC converter for digital-analog conversion of the output voltage of the controller; And a first resistor configured to vary a resistance value according to the temperature of the BMS and a reference resistor to maintain a predetermined resistance value, and to divide and output the output voltage of the controller through the variable resistor and the reference resistor. Including,
The internal resistance simulation unit may include: a fourth DC-AC converter configured to digital-analog convert the output voltage of the controller; And a second resistor configured to vary a resistance value according to the internal resistance of the BMS, and a reference resistor to maintain a predetermined resistance value, and to divide and output the output voltage of the controller through the variable resistor and the reference resistor. Including a converter,
The ph simulation unit includes a fifth DC-AC converter for digital-analog converting the output voltage of the controller; And a third resistor configured to vary a resistance value according to the ph of the BMS, and a reference resistor to maintain a predetermined resistance value, and to divide and output the output voltage of the controller through the variable resistor and the reference resistor. Including;
The control unit communicates with the controller through an address extension technique consisting of an address, data, and control bus.
The evaluation unit calculates an electrolyte specific gravity value based on the ph simulated by the ph simulation unit, and evaluates the state of charge of the battery from the calculated specific gravity value of the electrolyte, the specific gravity value of the electrolyte in consideration of the temperature characteristics of the cell BMS simulator, characterized in that the correction. delete The method of claim 1, wherein the voltage simulation unit, current simulation unit, temperature simulation unit, internal resistance simulation unit, and ph simulation unit, respectively,
And at least one of an isolation circuit for blocking voltage interference at a board level and a DC-DC converter for improving control accuracy. The method of claim 1, wherein the voltage simulation unit, current simulation unit, temperature simulation unit, internal resistance simulation unit, and ph simulation unit, respectively,
And a current limiting circuit for performing circuit protection operations. After converting the digital voltage into an analog voltage through the first DC-AC converter, and amplifying and outputting through an amplifier, and converts the digital voltage into analog voltage through the second DC-AC converter, and then through the VI converter Current simulation unit for flowing a current through the sensing resistor, a temperature simulation unit for converting the digital voltage to an analog voltage through a third DC-AC converter, and then divides and outputs the voltage through the variable resistor and the reference resistor of the first VR converter. An internal resistance simulation unit which converts the digital voltage into an analog voltage through a fourth DC-AC converter and divides and outputs the voltage through the variable resistor and the reference resistor of the second VR converter; and a digital through the fifth DC-AC converter. After converting the voltage into an analog voltage, ph simulation unit for outputting the voltage divided by the variable resistor and the reference resistor of the third VR converter, And an FPGA configured to convert a controller control value into a signal form recognizable by the voltage simulation unit, the current simulation unit, the temperature simulation unit, the internal resistance simulation unit, and the ph simulation unit. Unit, temperature simulation unit, internal resistance simulation unit, and ph simulation unit provide voltage, current, temperature, internal resistance or ph for BMS (Battery Management System) performance test, and simulated voltage, current, temperature, internal resistance And a BMS simulator for evaluating a state of the battery based on at least one of ph. And
A controller for generating and providing the controller control value for controlling at least one of an output voltage, a current, a temperature, an internal resistance, and a ph of the BMS simulator, and then monitoring the output of the BMS that is changed in response thereto;
The controller and the FPGA communicate with each other through an address extension technique consisting of an address, data, and control bus.
The BMS simulator calculates an electrolyte specific gravity value based on the ph simulated by the ph simulation unit, evaluates the state of charge of the battery from the calculated specific gravity value of the electrolyte, and the specific gravity value of the electrolyte takes into account cell temperature characteristics. BMS simulation system, characterized in that the correction.

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