Thermal runaway detection device, battery system, and thermal runaway detection method for battery system

Abstract

The present invention relates to a thermal runaway detection device, a battery system and a thermal runaway detection method for a battery system, and the thermal runaway detection device may include: a first measurement module, which is used to measure the temperature values ​​of multiple battery cells via at least one temperature sensor; a second measurement module, which is used to measure the output voltage value of the battery system; and a controller, which is used to determine the effectiveness of thermal runaway detection based on temperature values ​​by monitoring data received from the first measurement module, and detect thermal runaway of the battery system by selectively monitoring the temperature value or the output voltage value according to the effectiveness determination result of the thermal runaway detection based on the temperature value.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to and the benefit of Korean Patent Application No. 10-2019-0173307 filed in the Korean Intellectual Property Office on December 23, 2019, the entire contents of which are incorporated herein by reference. Technical Field

[0003] Embodiments of the present invention relate to a thermal runaway detection device, a battery system, and a thermal runaway detection method for a battery system. Background Art

[0004] Rechargeable batteries are different from primary batteries for providing irreversible conversion of chemical materials into electrical energy because rechargeable batteries can be repeatedly charged and discharged. Rechargeable batteries with low capacity are used as power supply devices for small electronic devices such as mobile phones, laptop computers, and video cameras, while rechargeable batteries with high capacity are used as power supply devices for hybrid vehicles.

[0005] Generally, a rechargeable battery includes an electrode assembly including a positive electrode, a negative electrode, and a separator provided between the positive electrode and the negative electrode, a housing for accommodating the electrode assembly, and an electrode terminal electrically connected to the electrode assembly. An electrolyte solution is injected into the housing to allow the battery to be charged and discharged through an electrochemical reaction of the positive electrode, the negative electrode, and the electrolyte solution. The shape of the housing (such as a cylindrical or rectangular shape) is variable depending on the use of the battery.

[0006] Lithium-ion batteries, which are representative rechargeable batteries, may experience thermal runaway due to abnormal operating conditions such as internal short circuits, overcharging, high temperature conditions, or external shocks. In the thermal runaway phenomenon, a large amount of heat accumulates in the battery to produce a chain reaction, which may lead to fire and explosion of the battery. Therefore, it is very important to predict thermal runaway of the battery from the perspective of battery safety.

[0007] In order to sense the thermal runaway phenomenon of a battery, a method for directly measuring the internal temperature of the battery, sensing a sharp increase in the measured temperature, and predicting thermal runaway is mainly used. However, when the internal temperature of the battery exceeds the measurement range or the thermal runaway algorithm does not operate normally due to a communication error, this method for predicting thermal runaway based on the internal temperature of the battery cannot detect the thermal runaway phenomenon.

[0008] The above information disclosed in this Background section is only for enhancement of understanding of the background of the invention and therefore it may contain information that does not form the prior art that is already known in this country to a person of ordinary skill in the art. Summary of the invention

[0009] The present invention is directed to providing a thermal runaway detection device for detecting a thermal runaway phenomenon of a battery based on the internal temperature of the battery when thermal runaway is difficult to predict, a battery system, and a thermal runaway detection method for the battery system.

[0010] An embodiment of the present invention provides a thermal runaway detection device for a battery system including a plurality of battery cells, comprising: a first measurement module, which is used to measure temperature values ​​of the plurality of battery cells via at least one temperature sensor; a second measurement module, which is used to measure an output voltage value of the battery system; and a controller, which is used to determine the effectiveness of thermal runaway detection based on temperature values ​​by monitoring data received from the first measurement module, and detect thermal runaway of the battery system by selectively monitoring temperature values ​​or output voltage values ​​according to a result of determining the effectiveness of thermal runaway detection based on temperature values.

[0011] The controller may determine the validity of thermal runaway detection based on the temperature value according to at least one of a communication state between the first measurement module and the controller, whether a problem occurs in the first measurement module or at least one temperature sensor, and validity of data received from the first measurement module.

[0012] When the communication status between the first measurement module and the controller is a fault state, the controller may monitor the output voltage value to detect thermal runaway of the battery system.

[0013] When a problem occurs in the first measurement module or the at least one temperature sensor, the controller may monitor the output voltage value to detect thermal runaway of the battery system.

[0014] The first measurement module may further perform a diagnosis function for diagnosing whether performances of the first measurement module and at least one temperature sensor have problems, and may transmit diagnosis result data of the execution of the diagnosis function to the controller.

[0015] The first measuring module can measure voltage values ​​of multiple battery cells and a battery module configured with multiple battery cells, and can compare voltage values ​​obtained by measuring the voltages at respective ends of the battery module with respective voltage values ​​obtained by measuring the voltages of the multiple battery cells to diagnose whether a problem occurs in the first measuring module.

[0016] The first measurement module may diagnose whether a problem occurs in the at least one temperature sensor by monitoring a temperature value acquired from the at least one temperature sensor.

[0017] The first measurement module may diagnose whether a communication problem with the controller occurs by monitoring data transmitted to the controller or data received from the controller.

[0018] The controller may diagnose validity of data received from the first measurement module, and when the data received from the first measurement module is determined to be unusable as a result of the diagnosis of validity, the controller may monitor the output voltage value to detect thermal runaway of the battery system.

[0019] When thermal runaway detection based on the temperature value is determined to be valid, the controller may monitor the temperature value to detect thermal runaway of the battery system.

[0020] The first measurement module and the second measurement module may communicate with the controller through separate communication lines.

[0021] Another embodiment of the present invention provides a battery system, including: a plurality of battery cells and the above-mentioned thermal runaway detection device.

[0022] Another embodiment of the present invention provides a thermal runaway detection method for a battery system including multiple battery cells, comprising: determining the effectiveness of thermal runaway detection based on temperature values ​​by monitoring data received from a first measurement module for measuring temperature values ​​of multiple battery cells by at least one temperature sensor; and detecting thermal runaway of the battery system by selectively monitoring the temperature value measured by the first measurement module or the output voltage value of the battery system measured by a second measurement module according to the effectiveness determination result of the thermal runaway detection based on the temperature value.

[0023] The detecting may include detecting thermal runaway of the battery system by monitoring the output voltage value when thermal runaway detection based on the temperature value is determined to be invalid.

[0024] The determining may include determining that thermal runaway detection based on the temperature value is invalid when a communication state between the first measurement module and the controller is a fault state.

[0025] The determining may include diagnosing the first measurement module and the at least one temperature sensor through the first measurement module, and determining that thermal runaway detection based on the temperature value is invalid when a problem occurs in the first measurement module or the at least one temperature sensor.

[0026] The diagnosing may include diagnosing whether a problem occurs in the first measurement module by comparing voltage values ​​obtained by measuring voltages at respective ends of a battery module configured with a plurality of battery cells with voltage values ​​obtained by measuring respective voltages of the plurality of battery cells.

[0027] The diagnosing may include diagnosing whether a problem occurs in the at least one temperature sensor by monitoring a temperature value acquired from the at least one temperature sensor.

[0028] The determining may include diagnosing validity of data received from the first measurement module, and determining that thermal runaway detection based on the temperature value is invalid when it is determined that the data received from the first measurement module cannot be used according to a result of the diagnosis of the validity.

[0029] The detecting may include detecting thermal runaway of the battery system by monitoring the temperature value when thermal runaway detection based on the temperature value is determined to be valid.

[0030] According to an embodiment of the present invention, when thermal runaway is difficult to predict, a thermal runaway phenomenon of a battery may be detected based on the internal temperature of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 A battery system according to an embodiment is shown.

[0032] Figure 2 A thermal runaway detection method for a battery system according to an embodiment is shown.

[0033] Figure 3 Show Figure 2 The diagnostic method in step S10.

[0034] Figure 4 Show Figure 2 The diagnostic method in step S12.

[0035] Figure 5 Show Figure 2 The diagnostic method in step S14. DETAILED DESCRIPTION

[0036] Now, embodiments of the present invention will be described in detail in conjunction with the accompanying drawings. Now, the effects and characteristics of the embodiments and their implementation methods will be described in detail in conjunction with the accompanying drawings. In the accompanying drawings, the same reference numerals indicate the same constituent elements, and their repeated description will not be provided. As will be appreciated by those skilled in the art, the described embodiments can be modified in a variety of different ways without departing from the spirit or scope of the present invention. Embodiments are provided as examples so that this disclosure can be thorough and comprehensive, and will fully provide aspects and characteristics of the present invention to those skilled in the art.

[0037] Therefore, for the purpose of fully understanding the aspects and features of the present invention, processes, factors, and techniques that may not be necessary for one of ordinary skill in the art may not be described. In the drawings, the relative sizes of elements, layers, and regions may be exaggerated for clarity.

[0038] In this specification, the term "and / or" includes all or random combinations of multiple items that are related and set. When describing the embodiments of the present invention, the use of "may" means "at least one embodiment of the present invention." Regarding the description of the embodiments of the present invention, a singular term may include a plural form unless stated otherwise.

[0039] Terms including ordinal numbers such as first, second, etc. will only be used to describe various components and are not to be construed as limiting these components. Terms are only used to distinguish one component from other components. For example, a first constituent element may be referred to as a second constituent element, and similarly, a second constituent element may be referred to as a first constituent element without departing from the scope of the present invention.

[0040] Now, a thermal runaway detection device, a battery system, and a thermal runaway detection method for a battery system according to embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0041] Figure 1 A battery system 1 according to an embodiment is shown.

[0042] refer to Figure 1 , the battery system 1 may include a battery module 10 and a thermal runaway detection device 20 .

[0043] The battery module 10 may include at least one rechargeable battery cell (hereinafter referred to as a battery cell) 11 connected in series and / or in parallel to each other. The battery module 10 may be connected to an external charging device (not shown) or a load (not shown) through system terminals (T+ and T-), and may be charged by the charging device or discharged by the load. Figure 1 The battery system 1 including one battery module 10 is illustrated, but the present invention is not limited thereto, and the battery system 1 may be configured with a plurality of battery modules 10 connected to each other in series and / or in parallel.

[0044] The thermal runaway detection device 20 detects thermal runaway of the battery system 1 , and for this purpose, it may include at least one temperature sensor 21 , a first measurement module 22 , a second measurement module 23 , and a controller 24 .

[0045] The temperature sensor 21 is arranged to contact or surround at least one battery cell 11 , and it may measure the temperatures of the plurality of battery cells 11 constituting the battery module 10 .

[0046] The first measurement module 22 may obtain the voltage value, current value, and temperature value of the battery module 10 by periodically measuring the voltage, current, and temperature of the battery module 10. For example, the first measurement module 22 may be electrically connected to at least one temperature sensor 21 to detect the temperature value of the battery cell 11 constituting the battery module 10 through the at least one temperature sensor 21. For example, the first measurement module 22 may be electrically connected to each end of the battery module 10 to detect the voltage value of the battery module 10. Further, the first measurement module 22 may be electrically connected to each end of the battery cell 11 constituting the battery module 10 to detect the battery cell voltage value of the battery cell 11.

[0047] The first measurement module 22 has a self-diagnosis function, and it can diagnose the performance error (that is, whether a problem occurs) of the first measurement module 22 and / or the sensor (for example, the temperature sensor 21) connected to the first measurement module 22 according to the diagnosis function. For example, the first measurement module 22 can compare the voltage value obtained by measuring the voltage at each end of the battery module 10 with the voltage value obtained by measuring the battery cell voltage of the plurality of battery cells 11 to confirm the validity of the voltage value, and thereby diagnose whether a problem occurs in the voltage measurement function of the first measurement module 22. Further, the first measurement module 22 compares the temperature values ​​obtained from the temperature sensor 21 with each other to confirm the validity of the temperature value, and thereby diagnose whether a problem occurs in the temperature measurement function of the first measurement module 22 or in the temperature sensor 21. For example, the first measurement module 22 can monitor the data transmitted to / received from the controller 24 to diagnose whether a problem occurs in the communication function with the controller 24.

[0048] The first measurement module 22 may be implemented by an analog front end (AFE) module or a battery cell supervision circuit (CSC).

[0049] The second measuring module 23 can continuously measure the output current and output voltage of the battery system 1 to detect the output current value and output voltage value of the battery system 1 .

[0050] like Figure 1 As shown in , when the battery system 1 includes one battery module 10, the second measurement module 23 can measure the voltage at each end of the battery module 10 to obtain the output voltage value of the battery system 1. When the battery system 1 is configured to include a plurality of battery modules 10 connected in series and / or in parallel to each other, the second measurement module 23 can be electrically connected between the plurality of battery modules 10 and the system terminals (T+ and T-) (i.e., between the positive terminal of the highest battery module and the negative terminal of the lowest battery module among the plurality of battery modules) to measure the output voltage of the battery system 1.

[0051] Further, the second measurement module 23 can obtain the output current value of the battery system 1 by measuring the current between the battery module 10 and the system terminals (T+ and T-). For example, the second measurement module 23 can be electrically connected to each end of a shunt resistor (not shown) connected between the battery module 10 and the system terminals (T+ and T-) to detect the output current value of the battery system 1 by measuring the voltage at each end of the shunt resistor.

[0052] The second measurement module 23 may be implemented by a battery disconnect unit (BDU) or a system based on chip (SBC).

[0053] The controller 24 may communicate with the first measurement module 22 to receive the voltage value, current value, and temperature value acquired from the battery module 10 from the first measurement module 22. The controller 24 may communicate with the second measurement module 23 to receive the output voltage value and the output current value of the battery system 1. Here, the communication line for the controller 24 to communicate with the first measurement module 22 may be separated from the communication line for the controller 24 to communicate with the second measurement module 23. Therefore, when the communication line between the first measurement module 22 and the controller 24 is damaged by thermal runaway, the controller 24 may communicate normally with the second measurement module 23.

[0054] The controller 24 may detect the generation of thermal runaway in the battery system 1 based on the measurement value (e.g., temperature value) received from the first measurement module 22 and the measurement value (e.g., output voltage value of the battery system 1) received from the second measurement module 23. In this case, the controller 24 may monitor the data received from the first measurement module 22 to diagnose the communication state between the first measurement module 22 and the controller 24, whether a problem occurs in the first measurement module 22 or the temperature sensor 21, or the validity of the data received from the first measurement module 22, and may determine whether the thermal runaway detection based on the measurement value received from the first measurement module 22 is valid based on the diagnosis result. The controller 24 may detect the generation of thermal runaway in the battery system 1 by selectively using the measurement value received from the first measurement module 22 or the measurement value received from the second measurement module 23 based on the validity determination result.

[0055] For example, when thermal runaway detection based on the measurement value received from the first measurement module 22 is determined to be valid, the controller 24 may detect the occurrence of thermal runaway by monitoring the temperature value received from the first measurement module 22. When a sharp change in temperature is detected at at least one battery cell 11, that is, when the change per unit time of the temperature value measured by at least one temperature sensor 21 exceeds a threshold value, the controller 24 may determine that a thermal runaway phenomenon occurs.

[0056] On the contrary, when the thermal runaway detection based on the measurement value received from the first measurement module 22 is determined to be invalid, the controller 24 may detect the generation of thermal runaway by monitoring the output voltage value of the battery system 1 received from the second measurement module 23. In this case, when the electrical connection between the battery module 10 and the external device is blocked by a power switch (not shown) connected between the battery module 10 and the external device, that is, when the output current of the battery system 1 does not flow, the second measurement module 23 may continuously measure the output voltage value of the battery system 1 and may transmit it to the controller 24. The controller 24 monitors the output voltage value of the battery system 1 received from the second measurement module 23, and when the change per unit time of the output voltage value of the battery system 1 exceeds the threshold value, the controller 24 may determine that the thermal runaway phenomenon has occurred.

[0057] When thermal runaway is generated in at least one battery cell 11 in the battery system 1, the temperature of the battery cell 11 may suddenly change due to the thermal runaway, the voltage at the damaged battery cell 11 may drop, and the output voltage of the battery system 1 may also suddenly drop. Therefore, when thermal runaway can be detected based on the temperature value acquired by the first measurement module 22, by detecting thermal runaway based on the temperature value received from the first measurement module 22, or otherwise by detecting thermal runaway by receiving the output voltage value of the battery system 1 from the second measurement module 23, the battery system 1 can obtain redundancy for thermal runaway detection.

[0058] The controller 24 may be a battery management unit (BMU), a battery system manager (BSM), or a battery management system (BMS).

[0059] Figure 1 The configuration of the battery system 1 shown in FIG. 1 is not essential, and thus the battery system 1 may be configured to include a battery system 1 having a plurality of components. Figure 1 The described constituent elements may include a greater or lesser number of constituent elements. For example, the battery system 1 may further include at least one power switch (not shown), which is connected between the battery module 10 and at least one of the system terminals (T+ and T-) and blocks / allows electrical connection between the battery module 10 and an external load / charging device.

[0060] Figure 2 A thermal runaway detection method for a battery system 1 according to an embodiment is shown. Figure 2 The thermal runaway detection method described can be referenced by Figure 1 The thermal runaway detection device 20 of the battery system 1 described above is executed.

[0061] refer to Figure 2, the controller 24 of the thermal runaway detection device 20 according to the embodiment diagnoses the communication state between the first measurement module 22 and the controller 24 (step S10). When it is determined as a communication failure state as a result of the diagnosis (step S11), the controller 24 monitors the output voltage value of the battery system 1 measured not by the first measurement module 22 but by the second measurement module 23 and detects thermal runaway of the battery system 1 (step S16).

[0062] Figure 3 Show Figure 2 The diagnostic method in step S10.

[0063] refer to Figure 3 According to the embodiment, the controller 24 of the thermal runaway detection device 20 waits for receiving data from the first measurement module 22 (step S20), and when no data is received from the first measurement module 22 for more than a predetermined time (step S21), the controller 24 determines that it is a communication failure state, and resets (i.e., performs a power-on reset (POR)) the first measurement module 22 (step S24).

[0064] The first measurement module 22 periodically transmits the measurement value obtained by the first measurement module 22 to the controller 24. Therefore, when no data is received from the first measurement module 22 for more than a predetermined time, the controller 24 may determine that the communication function between the controller 24 and the first measurement module 22 may be in a fault state.

[0065] When the communication function between the controller 24 and the first measurement module 22 enters a fault state due to a temporary error, it can be restored to a normal state by powering on and resetting the first measurement module 22 .

[0066] Therefore, when no data is received from the first measurement module 22 until the number of power-on resets of the first measurement module 22 is equal to or greater than the first set value (step S23), the controller 24 finally determines that the communication state between the controller 24 and the first measurement module 22 is a fault state (step S25). For example, when no data is received from the first measurement module 22 for more than a predetermined time after the first measurement module 22 is powered on and reset once, the controller 24 may determine that the communication state between the controller 24 and the first measurement module 22 is a fault state.

[0067] On the other hand, when data is received from the first measurement module 22 before or after the first measurement module 22 is powered on and reset, the controller 24 determines that the communication state between the controller 24 and the first measurement module 22 is allowed (step S22 ).

[0068] The time for waiting for receiving data in step S21 or the first set value in step S23 is adjustable depending on the demand or time conditions of the battery system 1 .

[0069] refer to Figure 2 , the controller 24 diagnoses the generation of a problem in the first measurement module 22 and the temperature sensor 21 connected to the first measurement module 22 based on the diagnosis result of the first measurement module 22 (step S12). When it is determined that a problem has occurred in the first measurement module 22 and / or the temperature sensor 21 (step S13), the controller 24 monitors the output voltage value of the battery system 1 measured by the second measurement module 23 instead of the first measurement module 22 to detect thermal runaway of the battery system 1 (step S16).

[0070] Figure 4 Show Figure 2 The diagnostic method in step S12.

[0071] refer to Figure 4 , the first measurement module 22 of the thermal runaway detection device 20 according to the embodiment periodically performs a diagnostic function to confirm whether a plurality of performance items have problems, and transmits the diagnostic results to the controller 24. For example, the first measurement module 22 compares the voltage value obtained by measuring the voltage at each end of the battery module 10 with the voltage value obtained by measuring the battery cell voltage of the plurality of battery cells 11, and confirms the validity of the voltage value, thereby diagnosing whether a problem occurs in the voltage measurement performance of the first measurement module 22. Further, the first measurement module 22 can diagnose whether a problem occurs in the temperature measurement function of the first measurement module 22 or in the temperature sensor 21 by comparing the temperature value obtained from the temperature sensor 21 and confirming the validity of the temperature value. The first measurement module 22 can also monitor the data transmitted / received by the controller 24 to diagnose whether a problem occurs in the communication function with the controller 24.

[0072] When receiving the diagnosis result from the first measurement module 22 (step S30), the controller 24 confirms the diagnosis result to thereby confirm whether a problem is detected in the first measurement module 22 and the temperature sensor 21 (step S31). When no problem is detected, the controller 24 determines that the first measurement module 22 and the temperature sensor 21 are operating normally (step S32).

[0073] When no problem is detected according to the diagnosis function, the first measurement module 22 may not transmit the diagnosis result to the controller 24. In this case, the controller 24 may determine that the first measurement module 22 and the temperature sensor 21 operate normally without receiving the diagnosis result from the first measurement module 22.

[0074] When it is confirmed that a problem is detected according to step S31 , the controller 24 resets (ie, powers on and resets) the first measurement module 22 (step S34 ).

[0075] When the performance error of the first measurement module 22 or the temperature sensor 21 is temporary, or when a temporary diagnosis error is generated by the first measurement module 22 , the diagnosis result of the first measurement module 22 can be restored to a normal state by powering on and resetting the first measurement module 22 .

[0076] Therefore, when the problem detection according to the self-diagnosis of the first measuring module 22 is continuously generated until the number of power-on resets of the first measuring module 22 is equal to or greater than the second set value (for example, 3 times) (step S33), the controller 24 finally determines that a problem occurs in the first measuring module 22 and / or the temperature sensor (step S35).

[0077] The second set value in step S33 is adjustable according to the demand of the battery system 1 or time conditions.

[0078] refer to Figure 2 , the controller 24 diagnoses the validity of the data received from the first measurement module 22 (step S14), and confirms whether the data received from the first measurement module 22 is available based on the diagnosis result (step S15). When the data received from the first measurement module 22 is determined to be unavailable, the controller 24 monitors the output voltage value of the battery system 1 measured by the second measurement module 23 instead of the first measurement module 22 to detect thermal runaway of the battery system 1 (step S16).

[0079] Figure 5 Show Figure 2 The diagnostic method in step S14.

[0080] refer to Figure 5 , the controller 24 of the thermal runaway detection device 20 according to the embodiment receives data from the first measurement module 22 (step S40), and verifies the validity of the received data to confirm whether a data error is generated (step S41). That is, when receiving data from the first measurement module 22, the controller 24 confirms whether the data is lost when transmitted from the first measurement module 22 or whether erroneous data is transmitted by the first measurement module 22 according to the verification of validity.

[0081] When no error is detected from the received data, the controller 24 determines that the data received from the first measurement module 22 is available (step S42 ).

[0082] On the contrary, when an error is detected from the received data, the controller 24 confirms whether errors are continuously generated for a predetermined number of times (for example, 2 times) for the same diagnostic item (step S43) in order to confirm whether they are temporary errors, and when errors are continuously generated for the same diagnostic item for a predetermined number of times, the controller 24 powers on and resets the first measurement module 22 (step S44). After the power-on reset, the controller 24 confirms whether errors are continuously generated for the same diagnostic item (step S45), and when errors are continuously generated, the controller 24 determines that the errors are not temporary, and finally determines that the data received from the first measurement module 22 is invalid and unusable (step S46).

[0083] refer to Figure 2 , when the situation is determined to be normal in step S10, step S12, and step S14, that is, when the communication state is determined to be normal by step S10, the first measurement module 22 and the temperature sensor 21 are determined to be operating normally by step S12, and the validity of the data is verified by step S14, the controller 24 determines that the thermal runaway detection is valid based on the measurement value received from the first measurement module 22. Therefore, the controller 24 monitors the temperature value received from the first measurement module 22 to detect the thermal runaway of the battery system 1 (step S17).

[0084] Figure 2 A diagnostic process for determining whether thermal runaway detection based on a temperature value is effective is shown, and the diagnostic process sequentially illustrates a case including a process for diagnosing a communication state between the first measurement module 22 and the controller 24 (step S10), a process for diagnosing whether a problem occurs in the first measurement module 22 and the temperature sensor 21 (step S12), and a process for diagnosing the validity of data received from the first measurement module 22 (step S14), but the present invention is not limited thereto. In another embodiment, the process for diagnosing a communication state between the first measurement module 22 and the controller 24 (step S10), the process for diagnosing whether a problem occurs in the first measurement module 22 and the temperature sensor 21 (step S12), and the process for diagnosing the validity of data received from the first measurement module 22 (step S14) may be implemented as separate tasks and may be executed by independent scheduling. In another embodiment, at least one of the process for diagnosing the communication status between the first measurement module 22 and the controller 24 (step S10), the process for diagnosing whether a problem occurs in the first measurement module 22 and the temperature sensor 21 (step S12), and the process for diagnosing the validity of the data received from the first measurement module 22 (step S14) can be omitted.

[0085] According to the above-described embodiment, the battery system 1 can detect thermal runaway of the battery system 1 in a case where thermal runaway cannot be detected by measuring the internal temperature of the battery system 1, such as when the communication line between the BMS and the AFE module is damaged, when a valid temperature value cannot be obtained due to an error of the AFE module or the temperature sensor, or when the internal temperature of the battery system 1 deviates from a measurable range. Therefore, the performance for detecting thermal runaway of the battery system 1 is improved, so the safety of the battery system 1 can be improved.

[0086] The electronic device or electrical device and / or other related devices or constituent elements according to an embodiment of the present invention can be implemented by using appropriate hardware, firmware (e.g., application specific integrated circuit), software, or a combination of software, firmware and hardware. For example, various configurations of the above-mentioned device can be located on an integrated circuit (IC) chip or an independent IC chip. In addition, various configurations of the above-mentioned device can be implemented on a flexible printed circuit film, a tape carrier package (TCP), a printed circuit board (PCB) or a substrate. The electrical connection or interconnection described in this specification can be implemented, for example, by a wire or a conductive element on a PCB, a different type of circuit carrier. The conductive element can, for example, include metallization (such as surface metallization and / or pins), and can include conductive polymers or ceramics. Further, electrical energy can be transmitted by electromagnetic radiation or wireless access using light.

[0087] In addition, various configurations of the device can be executed by at least one processor to perform the above-mentioned various functions, they can be executed in at least one computing device, and they can be processes or threads for executing computer program instructions and interacting with other system components. Computer program instructions are stored in a memory that can be implemented by a computing device using a standard memory device such as a random access memory (RAM). Computer program instructions can also be stored in a non-transitory computer readable medium such as a CD-ROM or a flash drive.

[0088] Further, one of ordinary skill in the art must understand that various functions of computing devices may be combined or united into a single computing device, or the functions of a particular computing device may be distributed to at least another computing device without departing from the scope of embodiments of the present invention.

[0089] <Description of the symbol>

[0090] 1: Battery system

[0091] 10: Battery module

[0092] 11: Battery Cell

[0093] 20: Thermal runaway detection equipment

[0094] 21: Temperature sensor

[0095] 22: First measurement module

[0096] 23: Second measurement module

[0097] 24: Controller

Claims

1. A thermal runaway detection device for a battery system including a plurality of battery cells, comprising: a first measuring module, the first measuring module being configured to measure temperature values ​​of the plurality of battery cells via at least one temperature sensor; A second measuring module, the second measuring module is used to measure the output voltage value of the battery system; as well as a controller configured to determine effectiveness of thermal runaway detection based on the temperature value by monitoring data received from the first measurement module, and detect thermal runaway of the battery system by selectively monitoring the temperature value or the output voltage value according to a determination result of effectiveness of thermal runaway detection based on the temperature value, The first measurement module further performs a diagnostic function to diagnose whether performance of the first measurement module and the at least one temperature sensor has a problem, and transmits diagnostic result data of the execution of the diagnostic function to the controller, and Wherein, the first measuring module measures the voltage values ​​of the multiple battery cells and the battery module configured with the multiple battery cells, and compares the voltage value obtained by measuring the voltage at each end of the battery module with each voltage value obtained by measuring the voltage of the multiple battery cells to diagnose whether the problem occurs in the first measuring module.

2. The thermal runaway detection device according to claim 1, wherein: The controller determines validity of the thermal runaway detection based on the temperature value according to at least one of a communication state between the first measurement module and the controller, whether the problem occurs in the first measurement module or the at least one temperature sensor, and validity of data received from the first measurement module.

3. The thermal runaway detection device according to claim 2, wherein: When the communication status between the first measurement module and the controller is a fault state, the controller monitors the output voltage value to detect the thermal runaway of the battery system.

4. The thermal runaway detection device according to claim 2, wherein: When the problem occurs in the first measurement module or the at least one temperature sensor, the controller monitors the output voltage value to detect the thermal runaway of the battery system.

5. The thermal runaway detection device according to claim 4, wherein: The first measurement module diagnoses whether the problem occurs in the at least one temperature sensor by monitoring a temperature value acquired from the at least one temperature sensor.

6. The thermal runaway detection device according to claim 4, wherein: The first measurement module diagnoses whether a communication problem with the controller occurs by monitoring data transmitted to or received from the controller.

7. The thermal runaway detection device according to claim 2, wherein: The controller diagnoses validity of data received from the first measurement module, and when the data received from the first measurement module is determined to be unusable as a result of the diagnosis of the validity, the controller monitors the output voltage value to detect the thermal runaway of the battery system.

8. The thermal runaway detection device according to claim 2, wherein: The controller monitors the temperature value to detect the thermal runaway of the battery system when the thermal runaway detection based on the temperature value is determined to be valid.

9. The thermal runaway detection device according to claim 1, wherein: The first measurement module and the second measurement module communicate with the controller through separate communication lines.

10. A battery system comprising: a plurality of battery cells; as well as The thermal runaway detection device according to claim 1.

11. A method for detecting thermal runaway of a battery system comprising a plurality of battery cells, comprising: Determining effectiveness of thermal runaway detection based on the temperature values ​​by monitoring data received from a first measurement module for measuring temperature values ​​of the plurality of battery cells by at least one temperature sensor; as well as detecting thermal runaway of the battery system by selectively monitoring the temperature value measured by the first measurement module or the output voltage value of the battery system measured by the second measurement module according to a determination result of effectiveness of the thermal runaway detection based on the temperature value, The first measurement module further performs a diagnostic function to diagnose whether performance of the first measurement module and the at least one temperature sensor has problems, and transmits diagnostic result data of the execution of the diagnostic function to the controller, and Wherein, the diagnosis includes: diagnosing whether the problem occurs in the first measurement module by comparing the voltage value obtained by measuring the voltage at each end of the battery module configured with the multiple battery cells with the voltage value obtained by measuring the individual voltages of the multiple battery cells.

12. The thermal runaway detection method according to claim 11, wherein: The detection includes: When the thermal runaway detection based on the temperature value is determined to be invalid, the thermal runaway of the battery system is detected by monitoring the output voltage value.

13. The thermal runaway detection method according to claim 12, wherein: The determination includes: When the communication state between the first measurement module and the controller is a fault state, it is determined that the thermal runaway detection based on the temperature value is invalid.

14. The thermal runaway detection method according to claim 12, wherein: The determination includes: When the problem occurs in the first measurement module or the at least one temperature sensor, it is determined that the thermal runaway detection based on the temperature value is invalid.

15. The thermal runaway detection method according to claim 14, wherein: The diagnosis includes: Whether the problem occurs in the at least one temperature sensor is diagnosed by monitoring a temperature value acquired from the at least one temperature sensor.

16. The thermal runaway detection method according to claim 12, wherein: The determination includes: diagnosing the validity of data received from the first measurement module, and When it is determined that the data received from the first measurement module cannot be used according to the result of the diagnosis of the validity, it is determined that the thermal runaway detection based on the temperature value is invalid.

17. The thermal runaway detection method according to claim 11, wherein: The detection includes: When the thermal runaway detection based on the temperature value is determined to be valid, the thermal runaway of the battery system is detected by monitoring the temperature value.

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