Battery safety control method and simulation control device thereof

Abstract

The invention relates to the technical field of battery safety control, and discloses a battery safety control method and a simulation control device thereof, and the device comprises a control platform, and the top of the control platform is provided with a battery management core module. A heating assembly, a force applying assembly, a current applying assembly and a pressurizing assembly are arranged on the outer wall of the battery management core module, and a control panel and an alarm are fixedly assembled on the top of the control platform. Through the control method, the single voltage and probability distribution under different driving conditions can be analyzed, the inconsistency degree of the battery can be effectively excavated, the actual production and manufacturing are guided, the initial inconsistency of the battery is reduced, and the simulation control device is combined with the control panel, so that the reliability of the battery is improved. A more efficient and more accurate management effect of the battery management core module can be realized, the use condition of the battery management core module is optimized, and the vehicle performance is further improved.

Description

Technical Field

[0001] The present invention relates to the technical field of battery safety control, and in particular to a battery safety control method and an analog control device thereof. Background Art

[0002] In order to reduce greenhouse gas emissions and alleviate the energy crisis, new energy vehicles are developing rapidly. However, there are many fire safety accidents in new energy vehicles, most of which are caused by battery failure. Battery thermal runaway poses a great threat to the personal and property safety of drivers and passengers. How to effectively detect battery failures and give early warnings is crucial, so battery safety needs to be controlled;

[0003] Mechanical abuse of batteries mainly refers to safety issues such as short circuits and abnormal temperatures in batteries caused by squeezing, collisions, and punctures. Lithium-ion batteries have poor safety after being subjected to mechanical abuse, and are prone to shell cracking, electrolyte leakage, and even internal short circuits and fires and explosions.

[0004] The parameters of battery charge state and battery health state, voltage, temperature, current and collision force are the safety state parameters of the battery system. Abnormal fluctuations in these parameters are usually early indicators of battery failure. The commonly used fault diagnosis methods are based on data-driven methods and knowledge-based methods, but the inconsistency of batteries has existed since production and gradually expands with the increase of battery usage time and vehicle mileage. Therefore, this method has limitations and needs to be improved. Summary of the invention

[0005] The present invention provides a battery safety control method and an analog control device thereof, which have the advantages of xxxxxxxx and solve the problems raised by the above-mentioned background technology.

[0006] The present invention provides the following technical solutions: a battery safety control method and a simulation control device thereof, comprising a control platform, a battery management core module is installed on the top of the control platform, the outer walls of the battery management core module are respectively provided with a heating component, a force applying component, a current applying component and a pressurizing component, and a control panel and an alarm are respectively fixedly installed on the top of the control platform.

[0007] As a preferred technical solution of the present invention, the battery management core module includes a voltage monitoring module, a current monitoring module, a temperature monitoring module, a force data monitoring module and an overvoltage protector. The core part of the battery management core module is composed of a BQ76930 chip, which is responsible for managing and monitoring the status of the battery pack.

[0008] As a preferred technical solution of the present invention, the battery management core module is a multi-cell lithium battery pack monitoring chip, and the battery management core module supports communication with an external controller (such as MSP430) through an I2C communication interface;

[0009] The voltage detection module detects the voltage of each battery in the battery management core module through an internal ADC (analog-to-digital converter), the temperature monitoring module monitors the temperature of the battery management core module in real time through an external temperature sensor, and the current monitoring module measures the charging and discharging currents through a connected sampling resistor;

[0010] When the voltage of the battery management core module exceeds a set upper limit or falls below a set lower limit, the overvoltage protector triggers a protection function.

[0011] As a preferred technical solution of the present invention, the temperature monitoring module monitors the temperature of the battery management core module through a temperature sensor, the voltage monitoring module can monitor the voltage of the battery management core module in real time, the current monitoring module monitors the total current value of the battery management core module, and the force data monitoring module can be used to monitor the withstand force value of the battery management core module.

[0012] As a preferred technical solution of the present invention, the heating component includes three heating temperature conditions A, B, and C, and A represents the mechanical abuse heating temperature value, B represents the electrical abuse heating temperature value, and C represents the thermal abuse temperature value.

[0013] As a preferred technical solution of the present invention, the force applying component includes three constant force applying values ​​and three specific blasting force applying values.

[0014] As a preferred technical solution of the present invention, the current applying component includes a current regulator.

[0015] As a preferred technical solution of the present invention, the pressurizing component includes a needle puncture mechanical abuse module and an overcharge abuse module.

[0016] As a preferred technical solution of the present invention, the heating component, the force applying component, the current applying component and the pressurizing component are all electrically connected to the control panel and the alarm.

[0017] A battery safety control method comprises the following steps:

[0018] S1: Analyze various situations generated by the battery management core module through the control panel. After the analysis is completed, the BMS hazard identification and risk assessment can be carried out according to the output analysis documents and the determined scope;

[0019] S2: The control panel can simulate the internal state of the battery management core module by applying data to the battery management core module through the heating component, the force applying component, the current applying component and the pressurizing component, and thus can indirectly analyze and predict the risk of safety failure of the battery management core module. Therefore, the safety state of the battery management core module is inversely proportional to the degree of abuse of the battery management core module, as shown in formula ①.

[0020]

[0021] ① In the formula, x represents all the predicted states and external measurement parameters of the battery management core module, including the voltage, charge and discharge current, temperature of the battery management core module and the internal state of the battery management core module after being subjected to force. It can be seen from formula ① that the safety state value of the battery management core module decreases as the degree of degradation of the battery management core module increases. The specific mapping relationship is related to the type of battery management core module and can be defined as an exponential function, a polynomial function or a logarithmic function.

[0022] S3: The basic relationship between the safety status of the battery management core module and the external characteristic parameters is as follows: Figure 5 As shown, SOS is fsafety in formula ①, and the battery management core module is directly related to the safe and efficient operation of the car;

[0023] S4: When the temperature monitoring module detects that the temperature of the battery management core module exceeds the safe range, it will send a signal, so that the control panel can adjust the temperature of the battery management core module through the cooling device to control it, thereby effectively ensuring that the battery management core module can always be in a suitable temperature range when working;

[0024] S5: When the voltage monitoring module detects that the voltage of the battery management core module exceeds the preset range, it will send a signal and control the BMS through the control panel to adjust the battery management core module to a charging or discharging state;

[0025] S6: If the current monitoring component detects that the battery management core module has an overcurrent condition, the battery management core module can be immediately disconnected from the battery output through the overvoltage protector;

[0026] S7: When the force data monitoring module applies different forces to the battery management core module to test the damage of the battery management core module, it will immediately send a signal when the damage value is exceeded, and upload the data to the control panel after recording, so that control measures can be taken when the limit value is not reached in actual use;

[0027] S8: The entire simulation device can monitor the operating status of the battery management core module in real time and diagnose potential faults. Once a fault is detected, immediate measures are taken to limit the power output and disconnect the battery management core module from the heating component, force application component, current application component and pressurization component respectively, and the alarm sounds an alarm.

[0028] The present invention has the following beneficial effects:

[0029] 1. The battery safety control method and its simulation control device can analyze the single cell voltage and probability distribution under different driving conditions, and can effectively explore the degree of battery inconsistency, guide actual production and manufacturing, and reduce the initial inconsistency of the battery. The simulation control device is combined with the control panel to achieve more efficient and accurate battery management core module management effect, optimize the use of the battery management core module, and further improve vehicle performance.

[0030] 2. The battery safety control method and the analog control device thereof can extract the multi-time scale and time-frequency characteristics of early risk signals through the control panel due to the voltage monitoring module, current monitoring module, temperature monitoring module, and force data monitoring module, formulate a multi-level risk warning strategy generated by the battery management core module in actual situations, realize the safe operation of new energy vehicles, and accurately predict and control the various states of the battery management core module, so as to ensure the safe and reliable operation of electric vehicles.

[0031] 3. The battery safety control method and its analog control device can realize online quantitative evaluation of safety risk status through data collection and model fusion strategy of battery management core module by voltage monitoring module, current monitoring module, temperature monitoring module and strength data monitoring module, and realize long-term and short-term prediction of status of battery management core module through big data monitoring and analysis in control panel, so that the safety status of battery management core module can be monitored and traced throughout its life cycle, which has important engineering application value. The safety control strategy of high-quality prevention, control and decision-making can effectively ensure the safe use of battery management core module.

[0032] 4. The battery safety control method and the analog control device thereof monitor the status of the battery management core module through the entire battery safety control method to ensure that the battery management core module is charged and discharged within a safe working range. At the same time, various electrical isolation technologies are used to protect the low-voltage circuit to ensure the stability of the operation of the battery management core module. In addition, since the control panel can monitor the voltage, current, temperature and force of the battery management core module in real time, it can be known that abnormal conditions such as overvoltage, overcurrent and overtemperature can be controlled and the battery management core module can be protected. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic diagram of the simulation control architecture of the present invention;

[0034] Figure 2 A schematic diagram of the correlation between battery inconsistency, safety and battery aging in the present invention;

[0035] Figure 3 It is a schematic diagram of the cause of thermal runaway of the present invention;

[0036] Figure 4 This is the early warning logic operation diagram of the present invention;

[0037] Figure 5 It is a schematic diagram of the relationship between the safety status and external characteristic parameters of the battery management core module of the present invention.

[0038] In the figure: 1. Control platform; 2. Battery management core module; 3. Heating component; 4. Force applying component; 5. Current applying component; 6. Pressurizing component; 7. Control panel; 8. Alarm. DETAILED DESCRIPTION

[0039] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] See also Figure 1 - Figure 5 A battery safety control method and a simulation control device thereof include a control platform 1, a battery management core module 2 is installed on the top of the control platform 1, the outer walls of the battery management core module 2 are respectively provided with a heating component 3, a force applying component 4, a current applying component 5 and a pressurizing component 6, and a control panel 7 and an alarm 8 are respectively fixedly installed on the top of the control platform 1.

[0041] In a preferred embodiment, the battery management core module 2 includes a voltage monitoring module, a current monitoring module, a temperature monitoring module, a force data monitoring module and an overvoltage protector. The core part of the battery management core module 2 is composed of a BQ76930 chip, which is responsible for managing and monitoring the status of the battery pack.

[0042] In a preferred embodiment, the battery management core module 2 is a multi-cell lithium battery pack monitoring chip, and the battery management core module 2 supports communication with an external controller (such as MSP430) via an I2C communication interface;

[0043] The voltage detection module detects the voltage of each battery in the battery management core module 2 through the internal ADC (analog-to-digital converter), the temperature monitoring module monitors the temperature of the battery management core module 2 in real time through an external temperature sensor, and the current monitoring module measures the charging and discharging current through the connected sampling resistor;

[0044] When the voltage of the battery management core module 2 exceeds the set upper limit or falls below the lower limit, the overvoltage protector will trigger the protection function;

[0045] When the voltage of the battery management core module 2 exceeds the set upper limit or falls below the lower limit, the overvoltage protector will trigger the protection function, thereby disconnecting the battery management core module 2 from the force application component 4, thereby effectively preventing the battery management core module 2 from being easily damaged during use, thereby effectively extending the service life of the battery management core module 2.

[0046] In a preferred embodiment, the temperature monitoring module monitors the temperature of the battery management core module 2 through a temperature sensor, the voltage monitoring module can monitor the voltage of the battery management core module 2 in real time, the current monitoring module monitors the total current value of the battery management core module 2, and the strength data monitoring module can be used to monitor the withstand strength value of the battery management core module 2;

[0047] The temperature monitoring module can effectively ensure that the battery management core module 2 operates within a suitable temperature range, so that the temperature of the battery management core module 2 can be controlled at a constant temperature at all times.

[0048] In a preferred embodiment, the heating component 3 includes three heating temperature conditions A, B, and C, and A represents the mechanical abuse heating temperature value, B represents the electrical abuse heating temperature value, and C represents the thermal abuse temperature value;

[0049] When the battery management core module 2 works at extreme temperatures, the heat cannot be dissipated in time. Usually, thermal abuse is one of the direct causes of triggering thermal runaway of the battery management core module 2. When the heat generation rate of the battery management core module 2 is greater than the heat dissipation rate, the temperature continues to rise, which will trigger a thermal runaway chain reaction of the battery management core module 2, and eventually lead to the occurrence of thermal runaway.

[0050] In addition to overheating caused by mechanical and electrical abuse, local overheating may also occur due to loose connections and increased contact resistance. In addition, inconsistent internal resistance and different heat dissipation conditions of the battery management core module 2 will also cause thermal inconsistency, which will cause the battery management core module 2 to overheat. At this time, the temperature monitoring module can transmit a signal so that the control panel 7 can control it, and record and upload the data to the cloud, so that the battery management core module 2 can be effectively controlled later.

[0051] In a preferred embodiment, the force applying component 4 includes three constant force applying values ​​and three specific blasting force applying values.

[0052] In a preferred embodiment, the current applying assembly 5 includes a current regulator;

[0053] The sampling resistor in the discharge path of the battery management core module 2 is used to measure the current flowing through the battery pack, and the current current value can be obtained by measuring the voltage drop across the resistor.

[0054] In a preferred embodiment, the pressurizing assembly 6 includes a needle puncture mechanical abuse module and an overcharge abuse module;

[0055] Since different circuit parts of the BMS operate at different voltage levels, in order to achieve isolation and ensure stable power supply at different voltages, a DCIDC converter is usually required to convert high voltage into low voltage to supply the low voltage controller part.

[0056] In a preferred embodiment, the heating component 3 , the force applying component 4 , the current applying component 5 , and the pressurizing component 6 are all electrically connected to the control panel 7 and the alarm 8 .

[0057] A battery safety control method comprises the following steps:

[0058] S1: Analyze various situations generated by the battery management core module 2 through the control panel 7, and after the analysis is completed, carry out BMS hazard identification and risk assessment according to the output analysis documents and the determined scope;

[0059] S2: Since the control panel 7 can simulate the internal state of the battery management core module 2 after applying data to the battery management core module 2 through the heating component 3, the force applying component 4, the current applying component 5 and the pressurizing component 6, and thus can indirectly analyze and predict the risk of safety failure of the battery management core module 2, the safety state of the battery management core module 2 is inversely proportional to the degree of abuse of the battery management core module 2, as shown in formula ①

[0060]

[0061] ① In the formula, x represents all predicted states and external measurement parameters of the battery management core module 2, including the voltage, charge and discharge current, temperature of the battery management core module 2 and the internal state of the battery management core module 2 after being subjected to force. It can be seen from formula ① that the safety state value of the battery management core module 2 decreases as the degree of degradation of the battery management core module 2 increases. The specific mapping relationship is related to the type of the battery management core module 2 and can be defined as an exponential function, a polynomial function or a logarithmic function.

[0062] S3: The basic relationship between the safety status of the battery management core module 2 and the external characteristic parameters is as follows Figure 5 As shown, SOS is fsafety in formula ①, and the battery management core module 2 is directly related to the safe and efficient operation of the car;

[0063] S4: When the temperature monitoring module detects that the temperature of the battery management core module 2 exceeds the safe range, it will send a signal, so that the control panel 7 can adjust the temperature of the battery management core module 2 through the cooling device to control it, thereby effectively ensuring that the battery management core module 2 can always be in a suitable temperature range during operation;

[0064] S5: When the voltage monitoring module detects that the voltage of the battery management core module 2 exceeds the preset range value, it will transmit a signal and control the BMS through the control panel 7 to adjust the battery management core module 2 to a charging or discharging state;

[0065] S6: If the current monitoring component detects that the battery management core module 2 has an overcurrent condition, the battery management core module 2 can be immediately disconnected from the battery output through the overvoltage protector;

[0066] S7: When the force data monitoring module applies different forces to the battery management core module 2 to test the damage of the battery management core module 2, a signal will be immediately emitted when the damage value is exceeded, and the data will be recorded and uploaded to the control panel 7, so that control measures can be taken when the limit value is not reached in actual use;

[0067] S8: The entire simulation device can monitor the operating status of the battery management core module 2 in real time, diagnose potential faults, and take immediate measures once a fault is detected to limit the power output and disconnect the battery management core module 2 from the heating component 3, the force applying component 4, the current applying component 5 and the pressurizing component 6, and make the alarm 8 sound an alarm;

[0068] Analog Controls:

[0069] The analog sensor signal temperature, voltage, current and force application data are converted into digital signals for processing by the microprocessor, and the signal conversion is precisely controlled by setting the conversion range and resolution, and the operational amplifier is used to amplify, filter, compare and perform other analog signal processing, and precise control is achieved by adjusting parameters such as gain and feedback network, while analog switches and relays are used to control the on and off of the circuit, and the overall analog control: the current path is adjusted by turning the control panel 7 on and off to manage the charging and discharging process of the battery management core module 2, and the analog control can also control the power path by adjusting the parameters of the charging current and voltage threshold, and finally balance the charge state between the battery management core module 2 and the vehicle, and finally achieve charge balance by adjusting the equalizing resistor and the current path.

[0070] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0071] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A battery safety simulation control device, comprising a control platform (1), characterized in that: A battery management core module (2) is installed on the top of the control platform (1), and the outer wall of the battery management core module (2) is respectively provided with a heating component (3), a force applying component (4), a current applying component (5) and a pressurizing component (6), and a control panel (7) and an alarm (8) are respectively fixedly mounted on the top of the control platform (1).

2. A battery safety simulation control device according to claim 1, characterized in that: The battery management core module (2) comprises a voltage monitoring module, a current monitoring module, a temperature monitoring module, a force data monitoring module and an overvoltage protector. The core part of the battery management core module (2) is composed of a BQ76930 chip, which is responsible for managing and monitoring the status of the battery pack.

3. A battery safety simulation control device according to claim 2, characterized in that: The battery management core module (2) is a multi-cell lithium battery pack monitoring chip, and the battery management core module (2) supports communication with an external controller (such as MSP430) via an I2C communication interface; The voltage detection module detects the voltage of each battery cell inside the battery management core module (2) through an internal ADC (analog-to-digital converter), the temperature monitoring module monitors the temperature of the battery management core module (2) in real time through an external temperature sensor, and the current monitoring module measures the charging and discharging currents through a connected sampling resistor; When the voltage of the battery management core module (2) exceeds a set upper limit or falls below a set lower limit, the overvoltage protector triggers a protection function.

4. A battery safety simulation control device according to claim 3, characterized in that: The temperature monitoring module monitors the temperature of the battery management core module (2) through a temperature sensor, the voltage monitoring module can monitor the voltage of the battery management core module (2) in real time, the current monitoring module monitors the total current value of the battery management core module (2), and the force data monitoring module can be used to monitor the withstand force value of the battery management core module (2).

5. A battery safety simulation control device according to claim 1, characterized in that: The heating component (3) includes three heating temperature conditions, A, B and C, wherein A represents a mechanical abuse heating temperature value, B represents an electrical abuse heating temperature value, and C represents a thermal abuse temperature value.

6. A battery safety simulation control device according to claim 1, characterized in that: The force applying component (4) includes three constant force applying values ​​and three specific blasting force applying values.

7. A battery safety simulation control device according to claim 1, characterized in that: The current applying component (5) comprises a current regulator.

8. A battery safety simulation control device according to claim 1, characterized in that: The pressurizing component (6) comprises a needle puncture mechanical abuse module and an overcharge abuse module.

9. A battery safety simulation control device according to claim 1, characterized in that: The heating component (3), the force applying component (4), the current applying component (5) and the pressurizing component (6) are all electrically connected to the control panel (7) and the alarm (8).

10. A battery safety control method according to claim 9, characterized in that: The following steps are involved: S1: Analyze various situations generated by the battery management core module (2) through the control panel (7), and after the analysis is completed, carry out BMS hazard identification and risk assessment according to the output analysis documents and the determined scope; S2: Since the control panel (7) can simulate the internal state of the battery management core module (2) by applying data to the battery management core module (2) through the heating component (3), the force applying component (4), the current applying component (5) and the pressurizing component (6), and thus can indirectly analyze and predict the risk of safety failure of the battery management core module (2), the safety state of the battery management core module (2) is inversely proportional to the degree of abuse of the battery management core module (2), as shown in formula ①. ① In the formula, x represents all predicted states and external measurement parameters of the battery management core module (2), including the voltage, charge and discharge current, temperature of the battery management core module (2) and the internal state of the battery management core module (2) after being subjected to force. It can be seen from formula ① that the safety state value of the battery management core module (2) decreases as the degree of degradation of the battery management core module (2) increases. The specific mapping relationship is related to the type of the battery management core module (2) and can be defined as an exponential function, a polynomial function or a logarithmic function. S3: The basic relationship between the safety state of the battery management core module (2) and the external characteristic parameters is shown in FIG5 , where SOS is fsafety in formula ①, and the battery management core module (2) is directly related to the safe and efficient operation of the vehicle; S4: When the temperature monitoring module detects that the temperature of the battery management core module (2) exceeds the safe range, it will send a signal, so that the control panel (7) can adjust the temperature of the battery management core module (2) through the cooling device to control it, thereby effectively ensuring that the battery management core module (2) can always be within a suitable temperature range when working; S5: When the voltage monitoring module detects that the voltage of the battery management core module (2) exceeds a preset range value, it will transmit a signal and control the BMS through the control panel (7) to adjust the battery management core module (2) to a charging or discharging state; S6: If the current monitoring component detects that the battery management core module (2) has an overcurrent condition, the battery management core module (2) may be immediately disconnected from the battery output via the overvoltage protector; S7: When the force data monitoring module applies different forces to the battery management core module (2) to test the damage of the battery management core module (2), a signal will be immediately emitted when the damage value is exceeded, and the data will be recorded and uploaded to the control panel (7), so that control measures can be taken when the limit value is not reached in actual use; S8: The entire simulation device can monitor the operating status of the battery management core module (2) in real time, diagnose potential faults, and take immediate measures once a fault is detected to limit the power output and disconnect the battery management core module (2) from the heating component (3), the force application component (4), the current application component (5) and the pressure application component (6), and cause the alarm (8) to sound an alarm.

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