Battery pack detection system and method

Abstract

The invention relates to a battery pack detection system and method. The battery pack detection system comprises a sensor circuit and a signal processing circuit. The transmitter circuit is connected with the signal processing circuit; the sensor circuit comprises a plurality of types of gas sensors, the types comprise a construction type and a gas detection type, and the plurality of gas sensors are arranged according to the types; the sensor circuit is used for performing gas detection on a preset position of the battery pack to obtain a plurality of response signals; and the signal processing circuit is used for processing the response signal to obtain detection data, and the detection data is used for determining whether gas leakage exists in a preset position of the battery pack or not. The noise interference can be reduced, and the detection precision and the detection effect can be improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery pack detection system and method. Background Art

[0002] With the development of new energy technology, batteries have been applied to many fields. At present, in order to improve the safety performance of battery packs, a certain concentration of hydrogen tracer gas is often filled into the battery packs, and then the battery packs are tested for hydrogen leakage.

[0003] However, traditional detection systems have the problems of low detection accuracy and are easily interfered by noise, resulting in poor detection results. Summary of the invention

[0004] Based on the above problems, the present application provides a battery pack detection system and method, which can reduce noise interference and improve detection accuracy and detection effect.

[0005] In the first aspect, the present application provides a battery pack detection system, which includes a sensor circuit and a signal processing circuit; the sensor circuit is connected to the signal processing circuit; the sensor circuit includes multiple types of gas sensors, including construction types and gas detection types, and multiple gas sensors are arranged according to the types; the sensor circuit is used to perform gas detection on preset positions of the battery pack to obtain multiple response signals; the signal processing circuit is used to process the response signals to obtain detection data, and the detection data is used to determine whether there is a gas leakage at the preset position of the battery pack.

[0006] In the technical solution of the embodiment of the present application, by performing detection by gas sensors of various structural types in the sensor circuit, response signals of hydrogen can be obtained from different angles. By performing detection by gas sensors of various gas detection types in the sensor circuit, response signals of hydrogen and other gases can be obtained. The multiple response signals obtained can support each other, which is helpful to identify and eliminate noise, thereby reducing noise interference and improving detection accuracy and detection effect.

[0007] In some embodiments, the sensor circuit includes a first type of sensor and a second type of sensor of different structural types; the second type of sensor includes a gas sensor of different gas detection types, and the signal processing circuit includes a first processing circuit, a second processing circuit and a third processing circuit; the first type of sensor is connected to the first processing circuit, the second type of sensor is connected to the second processing circuit, and the first processing circuit and the second processing circuit are both connected to the third processing circuit; the first processing circuit and the second processing circuit are both used to pre-process the response signal to obtain the processed signal; the third processing circuit is used to perform data processing on the processed signal to obtain the detection data. In the technical scheme of the embodiment of the present application, the response signals of different types of gas sensors are pre-processed by the first processing circuit and the second processing circuit respectively, so that the signal processing is more targeted, and the signal amplification processing, filtering processing, etc. can reduce noise interference and improve the accuracy of the signal. The analog-to-digital conversion of the processed signal by the third processing circuit can facilitate subsequent data analysis, thereby improving the efficiency and accuracy of gas detection.

[0008] In some embodiments, the first type of sensor is a micro-electro-mechanical system (MEMS) sensor, the first processing circuit includes a first filtering circuit; the output end of the first type of sensor is connected to the input end of the first filtering circuit; the output end of the first filtering circuit is connected to the input end of the third processing circuit. In the technical solution of the embodiment of the present application, the filtering processing of the first filtering circuit can remove noise and interference in the first response signal, thereby improving the detection accuracy of gas detection.

[0009] In some embodiments, the first filtering circuit includes a first amplifier, a first resistor, a second resistor, a first capacitor and a second capacitor; the first end of the first resistor is connected to the output end of the first type of sensor, and the second end of the first resistor is connected to the first end of the second resistor; the second end of the second resistor is connected to the positive input end of the first amplifier; the negative input end of the first amplifier is connected to the output end of the first amplifier; the first end of the first capacitor is connected to the positive input end of the first amplifier, and the second end of the first capacitor is grounded; the first end of the second capacitor is connected to the common end of the first resistor and the second resistor, and the second end of the second capacitor is connected to the output end of the first amplifier. In the technical solution of the embodiment of the present application, the first filtering circuit is composed of the first amplifier, the first resistor, the second resistor, the first capacitor and the second capacitor to form a second-order low-pass filtering circuit, which can filter out high-frequency noise in the response signal and obtain a relatively complete and pure processing signal.

[0010] In some embodiments, the second type of sensor is a ceramic sensor, and the second processing circuit includes a signal amplification circuit and a second filtering circuit; the output end of the second type of sensor is connected to the input end of the signal amplification circuit; the output end of the signal amplification circuit is connected to the input end of the second filtering circuit; the output end of the second filtering circuit is connected to the input end of the third processing circuit. In the technical solution of the embodiment of the present application, for the second type of sensor, the second processing circuit first amplifies the response signal, and then filters the amplified signal, which can better remove interference such as noise and obtain a more complete and pure processed signal.

[0011] In some embodiments, the signal amplification circuit includes a resistor voltage divider circuit, a second amplifier, and a third resistor; the resistor voltage divider circuit is respectively connected to the output end of the second type of sensor and the input end of the second amplifier; the output end of the second amplifier is connected to the input end of the second filtering circuit; and the two ends of the third resistor are respectively connected to the two setting ends of the second amplifier. In the technical solution of the embodiment of the present application, the response signal is converted by the resistor voltage divider circuit so that the second amplifier can perform amplification processing, thereby facilitating subsequent filtering processing, thereby reducing noise interference and improving the purity of the processed signal.

[0012] In some embodiments, the resistor voltage divider circuit includes a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor and an eighth resistor; the first end of the fourth resistor is connected to the first voltage end, the second end of the fourth resistor is respectively connected to the first end of the fifth resistor and the first end of the sixth resistor; the second end of the fifth resistor is connected to the positive input end of the second amplifier; the second end of the sixth resistor is grounded; the first end of the seventh resistor is connected to the first voltage end, the second end of the seventh resistor is respectively connected to the output end of the second type of sensor and the first end of the eighth resistor; the second end of the eighth resistor is connected to the negative input end of the second amplifier. In the technical solution of the embodiment of the present application, the resistor voltage divider circuit is composed of the fourth resistor, the fifth resistor, the sixth resistor, the seventh resistor and the eighth resistor, which can realize the conversion of the response signal, so that the second amplifier can amplify the converted signal, thereby obtaining a relatively complete and pure processed signal through the subsequent circuit.

[0013] In some embodiments, the signal amplification circuit further includes a first decoupling capacitor and a second decoupling capacitor; the first end of the first decoupling capacitor is connected to the positive power supply terminal of the second amplifier, and the second end of the first decoupling capacitor is grounded; the first end of the second decoupling capacitor is connected to the negative power supply terminal of the second amplifier. In the technical solution of the embodiment of the present application, the signal amplification circuit further includes a first decoupling capacitor and a second decoupling capacitor, and the decoupling capacitor can reduce power supply ripple, reduce noise interference, and make the signal amplification circuit work more stably.

[0014] In some embodiments, the third processing circuit includes a switch circuit, a data processing chip and a burning interface; the switch circuit is connected to the selection end of the data processing chip; the first input end of the data processing chip is connected to the output end of the first processing circuit, the second input end of the data processing chip is connected to the output end of the second processing circuit, and the burning end of the data processing chip is connected to the burning interface; the data processing chip is used to perform analog-to-digital conversion on the processing signal to obtain a conversion signal, and use the pre-acquired gas detection model to process the conversion signal to obtain detection data. In the technical solution of the embodiment of the present application, the data processing chip is used for data processing, which is not only efficient but also accurate, and the switch circuit and the burning interface can assist the data processing chip in working and realizing multiple functions, which can further improve the flexibility and applicability of the battery pack detection system.

[0015] In some embodiments, the third processing circuit further includes a standard clock circuit, a decoupling capacitor circuit and a reset circuit; the standard clock circuit is connected to the clock signal end of the data processing chip; the first end of the decoupling capacitor circuit is connected to the power supply end and the first voltage end of the data processing chip, and the second end of the decoupling capacitor circuit is grounded; the output end of the reset circuit is connected to the reset end of the data processing chip. In the technical solution of the embodiment of the present application, the standard clock circuit in the third processing circuit can provide a standard clock signal for the data processing chip, the decoupling capacitor circuit can reduce power supply ripple and reduce noise interference, and the reset circuit can reset the data processing chip and restore it to an initial state.

[0016] In some embodiments, the battery pack detection system further includes a power supply circuit; the power supply circuit is connected to the sensor circuit and the signal processing circuit respectively; the power supply circuit is used to supply power to the sensor circuit and the signal processing circuit respectively. In the technical solution of the embodiment of the present application, the power supply circuit can convert the power supply voltage of the power supply device, thereby providing a suitable power supply voltage for the sensor circuit and the signal processing circuit respectively.

[0017] In some embodiments, the power supply circuit includes a protection circuit and a voltage conversion circuit; the protection circuit is respectively connected to the power supply device and the voltage conversion circuit outside the system; the voltage conversion circuit is respectively connected to the sensor circuit and the signal processing circuit; the voltage conversion circuit is used to convert the power supply voltage of the power supply device, and use the converted voltage to power the sensor circuit and the signal processing circuit. In the technical solution of the embodiment of the present application, the protection circuit of the power supply circuit can protect the battery pack detection system, and the voltage conversion circuit can convert the power supply voltage to power the sensor circuit and the signal processing circuit, so that the battery pack detection system can work normally.

[0018] In some embodiments, the voltage conversion circuit includes multiple sub-conversion circuits, different sub-conversion circuits output different voltages, and each sub-conversion circuit is connected to at least one of the sensor circuit and the signal processing circuit. In the technical solution of the embodiment of the present application, different power supply voltages are obtained through multiple sub-conversion circuits to meet the power supply requirements of the sensor circuit and the signal processing circuit.

[0019] In some embodiments, the protection circuit includes a power supply interface, a diode, a transient suppression diode and a common-mode inductor; the cathode of the diode is connected to the power supply interface, and the anode of the diode is grounded; the first end of the transient suppression diode is connected to the power supply interface, and the second end of the transient suppression diode is grounded; the first end of the common-mode inductor is connected to the voltage conversion circuit, the second end and the fourth end of the common-mode inductor are both grounded, and the third end of the common-mode inductor is connected to the power supply interface. In the technical solution of the embodiment of the present application, the protection circuit includes a power supply interface, a diode, a transient suppression diode and a common-mode inductor. These components can protect the battery pack detection system when the power supply voltage is abnormal, thereby improving the safety and reliability of the battery pack detection system.

[0020] In some embodiments, the battery pack detection system further includes a communication circuit, which is connected to the signal processing circuit; the communication circuit is used to transmit the detection data output by the signal processing circuit to the host computer. In the technical solution of the embodiment of the present application, the battery pack detection system can communicate with the host computer through the communication circuit, thereby realizing more functions and improving the applicability of the system.

[0021] In some embodiments, the communication circuit includes a communication chip and an antenna interface; the data input terminal and the data output terminal of the communication chip are connected to the signal processing circuit, and the antenna terminal of the communication chip is connected to the antenna interface. In the technical solution of the embodiment, the antenna interface in the communication circuit can be connected to an external antenna device, so that the communication chip can communicate with the host computer and transmit the signal or data obtained by the battery pack detection system to the host computer, so that the host computer can determine whether there is a gas leak based on the signal or data.

[0022] In the second aspect, the present application also provides a battery pack detection method, which is applied to the battery pack detection system as described in the first aspect, and the method includes: performing gas detection on a preset position of the battery pack to obtain multiple response signals; processing each response signal separately to obtain a conversion signal; inputting the conversion signal into a pre-acquired gas detection model to obtain detection data output by the gas detection model, and the detection data is used to determine whether there is a gas leak at the preset position of the battery pack. In the technical solution of the embodiment of the present application, the response signal of hydrogen and the response signals of other gases can be obtained from different angles, and the multiple response signals can corroborate each other, which is helpful to identify and eliminate noise, thereby reducing noise interference and improving detection accuracy and detection effect.

[0023] In some embodiments, the method further includes: filtering multiple conversion signals collected by the battery pack detection system to obtain multiple filtered conversion signals; performing feature extraction on the multiple filtered conversion signals to obtain multiple feature data; and performing model training based on the multiple feature data to obtain a gas detection model. In the technical solution of the embodiment of the present application, a battery pack detection system can be used to collect data to obtain a data set, so as to better perform model training and thereby improve the accuracy of gas detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the optional embodiments below. The accompanying drawings are only used for the purpose of illustrating the optional embodiments and are not to be considered as limiting the present application. Moreover, the same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0025] Figure 1 A schematic diagram of the structure of a battery pack detection system according to an embodiment of the present application;

[0026] Figure 2 is a structural schematic diagram of a battery pack detection system according to an embodiment of the present application;

[0027] Figure 3 is a structural schematic diagram of a first type of sensor according to an embodiment of the present application;

[0028] Figure 4 is a schematic diagram of the connection relationship of the first type of sensors according to an embodiment of the present application;

[0029] Figure 5 is a structural schematic diagram of a first filtering circuit according to an embodiment of the present application;

[0030] Figure 6a is a structural schematic diagram of a second type of sensor according to an embodiment of the present application;

[0031] Figure 6b is a structural schematic diagram of a second type of sensor according to an embodiment of the present application;

[0032] Figure 7 is a structural schematic diagram of a second filter circuit according to an embodiment of the present application;

[0033] Figure 8 is a structural schematic diagram of a signal amplification circuit according to an embodiment of the present application;

[0034] Fig. 9 is a structural schematic diagram of a resistor voltage divider circuit according to an embodiment of the present application;

[0035] Fig.10is a structural schematic diagram of a signal amplification circuit according to an embodiment of the present application;

[0036] Fig.11 is a schematic structural diagram of a third processing circuit according to an embodiment of the present application;

[0037] Fig.12 is a structural schematic diagram of a switch circuit according to an embodiment of the present application;

[0038] Fig.13 It is a structural diagram of a burning interface according to an embodiment of the present application;

[0039] Fig.14 is a schematic structural diagram of a third processing circuit according to an embodiment of the present application;

[0040] Fig.15 is a schematic diagram of the structure of a standard clock circuit according to an embodiment of the present application;

[0041] Fig.16 is a structural schematic diagram of a decoupling capacitor circuit according to an embodiment of the present application;

[0042] Fig.17 is a schematic structural diagram of a reset circuit according to an embodiment of the present application;

[0043] Fig.18 is a schematic diagram of the connection relationship of a power supply circuit according to an embodiment of the present application;

[0044] Fig.19 is a structural schematic diagram of a power supply circuit according to an embodiment of the present application;

[0045] Fig. 20 is a schematic structural diagram of a voltage conversion circuit according to an embodiment of the present application;

[0046] Fig.21 is a schematic structural diagram of a sub-conversion circuit according to an embodiment of the present application;

[0047] Fig. 22 is a schematic diagram of the structure of a protection circuit according to an embodiment of the present application;

[0048] Fig.23 is a schematic diagram of the connection relationship of a communication circuit according to an embodiment of the present application;

[0049] Fig.24 is a structural schematic diagram of a communication circuit according to an embodiment of the present application;

[0050] Fig.25 is a flowchart of a battery pack detection method according to an embodiment of the present application;

[0051] Fig.26 It is a flowchart of model training in one embodiment of the present application;

[0052] Description of reference numerals:

[0053] Sensor circuit 11, signal processing circuit 12;

[0054] A first type of sensor 111 and a second type of sensor 112;

[0055] The first processing circuit 121 , the second processing circuit 122 , and the third processing circuit 123 .

[0056] A first filter circuit 1211, a voltage dividing resistor Rx, a first voltage terminal Vdd1, and a second voltage terminal Vdd2;

[0057] Analog ground AGND, digital ground DGND, power ground PDNG;

[0058] A first amplifier OP1, a first resistor R1, a second resistor R2, a first capacitor C1, and a second capacitor C2;

[0059] A signal amplifying circuit 1221 and a second filtering circuit 1222;

[0060] Resistor voltage divider circuit 1221R, second amplifier OP2, third resistor R3;

[0061] a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, and an eighth resistor R8;

[0062] A first decoupling capacitor Cx1 and a second decoupling capacitor Cx2;

[0063] Switch circuit 1231, data processing chip 1232, programming interface 1233, resistor PR;

[0064] Standard clock circuit 1234, decoupling capacitor circuit 1235, reset circuit 1236;

[0065] Crystal oscillator Y1, reset resistor Rr, reset capacitor Cr;

[0066] Power supply circuit 13, protection circuit 131, voltage conversion circuit 132;

[0067] A first sub-conversion circuit 1321, a second sub-conversion circuit 1322, and a third sub-conversion circuit 1323;

[0068] The fourth sub-conversion circuit 1324, the power supply interface P6, the diode D1, and the transient suppression diode D2;

[0069] Common mode inductor L, communication circuit 14, communication chip 141, antenna interface P7. DETAILED DESCRIPTION

[0070] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0071] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0072] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0073] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0074] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0075] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0076] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0077] With the development of new energy technologies, batteries have been applied to many fields. At present, in order to improve the safety performance of battery packs, a certain concentration of hydrogen tracer gas is often filled into the battery packs, and then the battery packs are tested for hydrogen leakage. However, the traditional detection system has the problem of low detection accuracy and is easily affected by noise, resulting in poor detection results.

[0078] An analysis of traditional detection systems revealed that traditional detection systems usually only have one gas sensor. If the detection accuracy of the gas sensor is not high, the detection accuracy of the entire detection system will be low. In addition, a gas sensor is also easily affected by noise, resulting in poor detection results.

[0079] Based on the above analysis, an embodiment of the present application provides a battery pack detection system. The battery pack detection system includes a sensor circuit and a signal processing circuit that are interconnected; the sensor circuit includes gas sensors of various structural types and various gas detection types, and the multiple gas sensors are arranged according to the type; the sensor circuit performs gas detection on a preset position of the battery pack to obtain multiple response signals; the signal processing circuit processes the response signal to obtain detection data, and according to the detection data, it can be determined whether there is a gas leak at the preset position of the battery pack. In the embodiment of the present application, by detecting with gas sensors of various structural types in the sensor circuit, the response signal of hydrogen can be obtained from different angles, and by detecting with gas sensors of various gas detection types in the sensor circuit, the response signals of hydrogen and other gases can be obtained, and the multiple response signals obtained can corroborate each other, which helps to identify and eliminate noise, thereby reducing noise interference and improving detection accuracy and detection effect.

[0080] The technical solutions involved in the embodiments of the present application are described in detail below.

[0081] According to some embodiments of the present application, referring to Figure 1, a battery pack detection system is provided. The battery pack detection system includes a sensor circuit 11 and a signal processing circuit 12; the sensor circuit 11 is connected to the signal processing circuit 12; the sensor circuit 11 includes multiple types of gas sensors, the above types include construction types and gas detection types, and multiple gas sensors are arranged according to the types; the sensor circuit 11 is used to perform gas detection on the preset position of the battery pack to obtain multiple response signals; the signal processing circuit 12 is used to process the response signal to obtain detection data, and the detection data is used to determine whether there is a gas leak at the preset position of the battery pack.

[0082] In an embodiment of the present application, the battery pack detection system includes a sensor circuit 11 and a signal processing circuit 12. Among them, the sensor circuit 11 includes gas sensors of various structural types, for example, the sensor circuit 11 includes a micro-electromechanical system sensor and a ceramic sensor. The sensor circuit 11 may also include gas sensors of various gas detection types, for example, the sensor circuit 11 may include a hydrogen sensor and a volatile organic compound (VOCs) sensor. Alternatively, the sensor circuit 11 includes gas sensors of various structural types, and gas sensors of the same structural type can detect multiple gas types, for example, the sensor circuit 11 includes a MEMS sensor and a ceramic sensor, wherein the ceramic sensor includes a hydrogen sensor and a VOCs sensor.

[0083] It should be noted that the construction type and gas detection type of the gas sensor in the sensor circuit 11 are not limited to the above description and can be set according to actual conditions.

[0084] Gas sensors of various structural types and gas sensors of various gas detection types can be laid out on circuit boards according to their types. For example, the sensor circuit 11 includes 2 MEMS sensors and 2 ceramic sensors, wherein the 2 MEMS sensors are laid out together and the 2 ceramic sensors are laid out together. Alternatively, the sensor circuit 11 includes 3 hydrogen sensors, 1 VOCs sensor, and the 3 hydrogen sensors are laid out together.

[0085] In actual applications, the sensor circuit 11 performs gas detection on preset positions of the battery pack to obtain multiple response signals. For example, two MEMS sensors perform gas detection on preset positions of the battery pack to obtain two hydrogen response signals, and two ceramic sensors perform gas detection on preset positions of the battery pack to obtain hydrogen and VOCs response signals. The above-mentioned preset positions may include positions such as the battery pack's inflation holes, exhaust holes, studs, and safety components.

[0086] The signal processing circuit 12 is connected to the sensor circuit 11. After the sensor circuit 11 obtains the response signal, it transmits the response signal to the signal processing circuit 12. The signal processing circuit 12 can perform amplification processing, filtering processing, analog-to-digital conversion processing, etc. on each response signal to obtain detection data. The signal processing circuit 12 can determine whether there is a gas leak at the preset position of the battery pack based on the detection data, and can also transmit the detection data to a host computer outside the battery pack detection system, and the host computer determines whether there is a gas leak at the preset position of the battery pack based on the detection data.

[0087] Among them, the detection data may be the actual gas concentration, and the judgment process may include: comparing the actual gas concentration with the critical threshold of leakage of the standard leak; when the actual gas concentration is greater than the critical threshold, determining that there is a gas leakage at the preset position of the battery pack; when the actual gas concentration is less than or equal to the critical threshold, determining that there is no gas leakage at the preset position of the battery pack.

[0088] It should be noted that the processing of the response signal by the signal processing circuit 12 can be implemented by a discrete processing circuit or by a signal processing chip.

[0089] It can be understood that gas sensors of different structural types can obtain hydrogen response signals from different angles when performing detection, and gas sensors of different gas detection types can obtain response signals of hydrogen and other gases when performing detection. The signal processing circuit 12 can perform more comprehensive gas analysis, identify and eliminate noise based on the response signals of the same gas and the response signals of different gases obtained by the sensor circuit 11, thereby reducing noise interference and improving detection accuracy.

[0090] Moreover, the sensor circuit 11 uses multiple gas sensors for parallel detection, and the signal processing circuit 12 can process and analyze data faster, thereby improving the detection efficiency. In addition, if a gas sensor fails, other gas sensors can continue to work, which increases the redundancy and reliability of the system. Furthermore, the type and layout of the sensor can be changed according to actual needs to meet the needs of specific applications, so that the battery pack detection system has flexibility and scalability. The sensor circuit can realize qualitative and quantitative detection of mixed gases, thereby realizing highly stable and highly selective detection of target gases such as hydrogen.

[0091] In the above embodiment, the battery pack detection system includes a sensor circuit and a signal processing circuit; the sensor circuit includes multiple types of gas sensors, including structural types and gas detection types, and multiple gas sensors are arranged according to the type; the sensor circuit performs gas detection on the preset position of the battery pack to obtain multiple response signals; the signal processing circuit processes the response signal to obtain detection data, and the detection data is used to determine whether there is a gas leak at the preset position of the battery pack. In the technical scheme of the embodiment of the present application, by detecting with gas sensors of multiple structural types in the sensor circuit, the response signal of hydrogen can be obtained from different angles, and by detecting with gas sensors of multiple gas detection types in the sensor circuit, the response signals of hydrogen and other gases can be obtained. The multiple response signals obtained can corroborate each other, which is helpful to identify and eliminate noise, thereby reducing noise interference and improving detection accuracy and detection effect.

[0092] According to some embodiments of the present application, referring to Figure 2 The sensor circuit 11 includes a first type sensor 111 and a second type sensor 112 of different construction types; the second type sensor 112 includes gas sensors of different gas detection types. For example, the sensor circuit 11 includes two first type sensors 111 and two second type sensors 112, wherein the two first type sensors 111 both perform hydrogen detection, and the two second type sensors 112 perform hydrogen detection and VOCs detection, respectively.

[0093] Based on the above sensor types, the signal processing circuit 12 includes a first processing circuit 121, a second processing circuit 122 and a third processing circuit 123; the first type of sensor 111 is connected to the first processing circuit 121, the second type of sensor 112 is connected to the second processing circuit 122, and the first processing circuit 121 and the second processing circuit 122 are both connected to the third processing circuit 123. The first processing circuit 121 and the second processing circuit 122 are both used to pre-process the response signal to obtain a processed signal; the third processing circuit 123 is used to perform data processing on the processed signal to obtain detection data.

[0094] In the embodiment of the present application, the signal processing circuit 12 includes a first processing circuit 121, a second processing circuit 122 and a third processing circuit 123. The first processing circuit 121 is connected to the first type of sensor 111, the first type of sensor 111 performs gas detection to obtain a first response signal, and transmits the first response signal to the first processing circuit 121, and the first processing circuit 121 pre-processes the first response signal to obtain a first processed signal.

[0095] The second processing circuit 122 is connected to the second type sensor 112. The second type sensor 112 performs gas detection to obtain a second response signal, and transmits the second response signal to the second processing circuit 122. The second processing circuit 122 preprocesses the second response signal to obtain a second processed signal.

[0096] The third processing circuit 123 is connected to the first processing circuit 121 and the second processing circuit 122 respectively. The first processing circuit 121 performs preprocessing and then inputs the first processed signal to the third processing circuit 123; the second processing circuit 122 performs preprocessing and then inputs the second processed signal to the third processing circuit 123. The third processing circuit 123 performs data processing on the first processed signal and the second processed signal to obtain detection data.

[0097] The preprocessing of the first processing circuit 121 and the second processing circuit 122 may be to amplify the response signal first and then filter the amplified signal; or to directly filter the response signal. The data processing of the third processing circuit 123 may include analog-to-digital conversion processing, and may also include processing using a machine learning model or a mathematical model.

[0098] It should be noted that the preprocessing of the first processing circuit 121 and the second processing circuit 122 and the data processing of the third processing circuit 123 are not limited to the above description and can be set according to actual conditions.

[0099] In some embodiments, the first processing circuit, the second processing circuit and the sensor circuit are separately arranged, so that the volume of the cover box where the sensor circuit is located can be saved, thereby achieving faster response recovery and more stable sensor testing.

[0100] In the above embodiment, the sensor circuit includes a first type of sensor and a second type of sensor of different structural types; the second type of sensor includes a gas sensor of different gas detection types, and the signal processing circuit includes a first processing circuit, a second processing circuit and a third processing circuit; the first processing circuit and the second processing circuit both preprocess the response signal to obtain a processed signal; the third processing circuit performs data processing on the processed signal to obtain detection data. In the technical scheme of the embodiment of the present application, the response signals of different types of gas sensors are preprocessed by the first processing circuit and the second processing circuit respectively, so that the signal processing is more targeted, and the signal is amplified, filtered, etc., which can reduce noise interference and improve the accuracy of the signal. The third processing circuit performs analog-to-digital conversion on the processed signal, which can facilitate subsequent data analysis, thereby improving the efficiency and accuracy of gas detection.

[0101] According to some embodiments of the present application, the first type of sensor 111 is a micro-electromechanical system MEMS sensor, and the first processing circuit 121 includes a first filtering circuit 1211; the output end of the first type of sensor 111 is connected to the input end of the first filtering circuit 1211; the output end of the first filtering circuit 1211 is connected to the input end of the third processing circuit 123.

[0102] In the present application, refer to Figure 3 The MEMS sensor shown includes multiple pins, a sensor internal resistor and a voltage divider resistor Rx. One pin is connected to the first voltage terminal Vdd1 to obtain the power supply voltage; one pin is connected to the second voltage terminal Vdd2 to obtain the heating voltage; one pin is connected to the analog ground AGND, one pin is connected to the digital ground DGND, and one pin Sen is an output pin.

[0103] The second voltage terminal, the sensor internal resistance and the digital ground DGND form a path. After the heating voltage is obtained, the path can realize the heating of the MEMS sensor. The sensor can detect gas only after the temperature rises. In addition, the resistance value of the sensor internal resistance is different for different actual gas concentrations. The first voltage terminal Vdd1, the sensor internal resistance, the voltage divider resistor Rx and the analog ground AGND form a path. The common end of the sensor internal resistance and the voltage divider resistor Rx is the output pin Sen of the MEMS sensor. Since the resistance value of the sensor internal resistance changes with the actual gas concentration, the response signal output by the output pin Sen of the MEMS sensor also changes accordingly.

[0104] It should be noted that the pins of the MEMS sensor are not limited to the above description, and may also include other pins.

[0105] In practical applications, the power supply voltage of the first voltage terminal may be 3.3V, and the heating voltage of the second voltage terminal may be 2.5V.

[0106] In some embodiments, DGND, AGND, and PGND refer to digital ground, analog ground, and power ground, respectively. Separating the three grounds is beneficial to reducing interference, such as suppressing common-mode signals and reducing power ripple.

[0107] Reference Figure 4 The first processing circuit 121 may include a first filtering circuit 1211. The output end of the first type sensor 111 is connected to the input end of the first filtering circuit 1211, and the output end of the first filtering circuit 1211 is connected to the input end of the third processing circuit 123.

[0108] In practical applications, the first response signal of the first type sensor 111 is transmitted to the first filtering circuit 1211 , and the first filtering circuit 1211 performs filtering processing on the first response signal to obtain a first processed signal.

[0109] The first filtering circuit 1211 can be implemented by a first-order low-pass filter, which allows low-frequency signals to pass through and weakens (or filters out) high-frequency signals. In signal processing, a signal can be regarded as a superposition of multiple different frequency components. The basic function of a first-order low-pass filter is to change the frequency component of the input signal, thereby allowing low frequencies to pass through and blocking high frequencies.

[0110] In the above embodiment, the first type of sensor is a micro-electromechanical system sensor, and the first processing circuit includes a first filtering circuit. In the technical solution of the embodiment of the present application, the filtering processing of the first filtering circuit can remove noise and interference in the first response signal, thereby improving the detection accuracy of gas detection.

[0111] According to some embodiments of the present application, the first filtering circuit 1211 is implemented by a second-order low-pass filtering circuit. Figure 5 The first filtering circuit 1211 includes a first amplifier OP1, a first resistor R1, a second resistor R2, a first capacitor C1 and a second capacitor C2; a first end of the first resistor R1 is connected to the output end of the first type sensor 111, and a second end of the first resistor R1 is connected to a first end of the second resistor R2; a second end of the second resistor R2 is connected to a positive input end of the first amplifier OP1; a negative input end of the first amplifier OP1 is connected to an output end of the first amplifier OP1; a first end of the first capacitor C1 is connected to a positive input end of the first amplifier OP1, and a second end of the first capacitor C1 is grounded; a first end of the second capacitor C2 is connected to a common end of the first resistor R1 and the second resistor R2, and a second end of the second capacitor C2 is connected to the output end of the first amplifier OP1.

[0112] In the embodiment of the present application, the first filtering circuit 1211 includes a first amplifier OP1, a first resistor R1, a second resistor R2, a first capacitor C1 and a second capacitor C2. The first end of the first resistor R1 is connected to the output end of the first type sensor 111, the second end of the first resistor R1 is connected to the first end of the second resistor R2, the second end of the second resistor R2 is connected to the first end of the first capacitor C1, and the second end of the first capacitor C1 is grounded. The second resistor R2 and the first capacitor C1 form a first-order filtering structure.

[0113] The positive input terminal of the first amplifier OP1 is connected to the second end of the second resistor R2, and the negative input terminal of the first amplifier OP1 is connected to the output terminal of the first amplifier OP1. The first amplifier OP1 forms a second-order filtering structure.

[0114] In practical applications, the response signal of the first type sensor 111 is transmitted to the first resistor R1, and then filtered once through the first-order filtering structure composed of the second resistor R2 and the first capacitor C1. The filtered signal is input to the positive input end of the first discharger, and is filtered twice through the first amplifier OP1 to obtain a processed signal.

[0115] In some embodiments, the first amplifier OP1 may include a power supply terminal, a ground terminal, etc. in addition to a positive input terminal, a negative input terminal, and an output terminal. For example, the power supply terminal of the first amplifier OP1 is connected to a 3.3V voltage terminal. It should be noted that the ports of the first amplifier OP1 are not limited to the above description and can be determined according to the amplifier actually selected.

[0116] In some embodiments, the power supply terminal of the first amplifier OP1 is connected to the voltage terminal, and a decoupling capacitor is connected to the power supply terminal of the first amplifier OP1. The decoupling capacitor can remove non-ideal factors such as ripples in the power supply, thereby reducing interference.

[0117] In the technical solution of the embodiment of the present application, the first filtering circuit is composed of a first amplifier, a first resistor, a second resistor, a first capacitor and a second capacitor to form a second-order low-pass filtering circuit, which can filter out the high-frequency noise in the response signal to obtain a relatively complete and pure processed signal.

[0118] According to some embodiments of the present application, the second type of sensor 112 is a ceramic sensor, and the second processing circuit 122 includes a signal amplification circuit 1221 and a second filtering circuit 1222; the output end of the second type of sensor 112 is connected to the input end of the signal amplification circuit 1221; the output end of the signal amplification circuit 1221 is connected to the input end of the second filtering circuit 1222; the output end of the second filtering circuit 1222 is connected to the input end of the third processing circuit 123.

[0119] In the present application, refer to Figure 6a The ceramic sensor shown has one pin connected to the third voltage terminal Vdd3, one pin connected to the power ground PGND, two pins connected to the analog ground AGND, and two pins as output terminals Sen. When the actual gas concentration is different, the response signal output by the output terminal Sen is different.

[0120] Reference Figure 6b The ceramic sensor shown has one pin connected to the third voltage terminal Vdd3, one pin connected to the power ground PGND, one pin connected to the analog ground AGND, and one pin as the output terminal Sen. When the actual gas concentration is different, the response signal output by the output terminal Sen is different.

[0121] Reference Figure 7The second processing circuit 122 may include a signal amplifying circuit 1221 and a second filtering circuit 1222. The input end of the signal amplifying circuit 1221 is connected to the output end of the second type sensor 112, and the output end of the signal amplifying circuit 1221 is connected to the input end of the second filtering circuit 1222. The output end of the second filtering circuit 1222 is connected to the input end of the third processing circuit 123.

[0122] In actual applications, the second response signal of the second type sensor 112 is transmitted to the signal amplifying circuit 1221, the signal amplifying circuit 1221 amplifies the second response signal, and then inputs the amplified signal into the second filtering circuit 1222, the second filtering circuit 1222 filters the amplified signal to obtain a second processed signal.

[0123] The second filter circuit 1222 can be implemented by a first-order low-pass filter or a second-order low-pass filter circuit. It should be noted that the first filter circuit 1211 and the second filter circuit 1222 can have the same structure or different structures.

[0124] In practical applications, the amplifiers used in the first filter circuit 1211 and the second filter circuit 1222 can be implemented by a multi-amplifier chip. For example, the first type of sensor 111 includes two hydrogen sensors, the first processing circuit 121 includes two first filter circuits 1211, and each first filter circuit 1211 includes one amplifier; the second type of sensor 112 includes one hydrogen sensor and one VOCs sensor, the second processing circuit 122 includes two second filter circuits 1222, and each second filter circuit 1222 includes one amplifier, that is, the first processing circuit 121 and the second processing circuit 122 include four amplifiers in total, so the first filter circuit 1211 and the second filter circuit 1222 can be implemented by a four-op-amp chip.

[0125] In the above embodiment, the second type of sensor is a ceramic sensor, and the second processing circuit includes a signal amplification circuit and a second filtering circuit. In the technical solution of the embodiment of the present application, for the second type of sensor, the second processing circuit first amplifies the response signal, and then filters the amplified signal, which can better remove interference such as noise and obtain a more complete and pure processed signal.

[0126] According to some embodiments of the present application, referring to Figure 8The signal amplifying circuit 1221 includes a resistor voltage divider circuit 1221R, a second amplifier OP2 and a third resistor R3; the resistor voltage divider circuit 1221R is respectively connected to the output end of the second type sensor 112 and the input end of the second amplifier OP2; the output end of the second amplifier OP2 is connected to the input end of the second filtering circuit 1222; and both ends of the third resistor R3 are respectively connected to the two setting ends of the second amplifier OP2.

[0127] In the embodiment of the present application, the signal amplifying circuit 1221 includes a resistor divider circuit 1221R and a second amplifier OP2. The resistor divider circuit 1221R is connected to the output end of the second type sensor 112 and the input end of the second amplifier OP2 respectively, and the output end of the second amplifier OP2 is connected to the second filter circuit 1222.

[0128] In actual applications, the second response signal of the second type sensor 112 is input to the resistor voltage divider circuit 1221R, and the resistor voltage divider circuit 1221R converts the response signal and transmits the converted signal to the second amplifier OP2. The second amplifier OP2 amplifies the converted signal and transmits the amplified signal to the second filter circuit 1222, and the second filter circuit 1222 filters the amplified signal and outputs a second processed signal. It can be understood that the actual gas concentration is different, the second response signal output by the second type sensor 112 is different, and after the conversion by the resistor voltage divider circuit 1221R and the input of the converted signal to the second amplifier OP2, the signal output by the second amplifier OP2 is also different, which finally leads to a different second processed signal.

[0129] The signal amplification circuit 1221 may further include a third resistor R3, and the two ends of the third resistor R3 are respectively connected to the two setting ends of the second amplifier OP2. The amplification factor of the second amplifier OP2 can be set by adjusting the resistance value of the third resistor R3. It can be understood that the amplification factor of the second amplifier OP2 is different, and the amplitude of the amplified signal output by the second amplifier OP2 is also different.

[0130] The above-mentioned resistor voltage divider circuit can be implemented by using a Wheatstone bridge, and the above-mentioned second amplifier OP2 can be an instrument amplifier.

[0131] In the above embodiment, the signal amplification circuit includes a resistor voltage divider circuit, a second amplifier and a third resistor. In the technical solution of the embodiment of the present application, the response signal is converted by the resistor voltage divider circuit so that the second amplifier can perform amplification processing, thereby facilitating subsequent filtering processing, thereby reducing noise interference and improving the purity of the processed signal.

[0132] According to some embodiments of the present application, referring to Fig. 9The resistor voltage divider circuit 1221R includes a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7 and an eighth resistor R8; the first end of the fourth resistor R4 is connected to the first voltage end, and the second end of the fourth resistor R4 is respectively connected to the first end of the fifth resistor R5 and the first end of the sixth resistor R6; the second end of the fifth resistor R5 is connected to the positive input end of the second amplifier OP2; the second end of the sixth resistor R6 is grounded; the first end of the seventh resistor R7 is connected to the first voltage end, and the second end of the seventh resistor R7 is respectively connected to the output end of the second type sensor 112 and the first end of the eighth resistor R8; the second end of the eighth resistor R8 is connected to the negative input end of the second amplifier OP2.

[0133] In the embodiment of the present application, the first end of the fourth resistor R4 is connected to the first voltage terminal Vdd1, the second end of the fourth resistor R4 is connected to the first end of the sixth resistor R6, and the second end of the sixth resistor R6 is connected to the analog ground AND, that is, the fourth resistor R4 and the sixth resistor R6 are connected in series between the first voltage terminal Vdd1 and the analog ground AGND to form a series circuit. The fourth resistor R4 and the sixth resistor R6 divide the voltage of the first voltage terminal Vdd1, that is, the voltage of the common end of the two resistors can be determined according to the resistance values ​​of the fourth resistor R4 and the sixth resistor R6 and the voltage of the first voltage terminal Vdd1. The first end of the fifth resistor R5 is connected to the common end of the fourth resistor R4 and the sixth resistor R6, and the second end of the fifth resistor R5 is connected to the positive input end of the second amplifier OP2. After determining the voltage of the common end of the fourth resistor R4 and the sixth resistor R6, the voltage of the positive input end of the second amplifier OP2 can be determined according to the voltage of the common end and the resistance value of the fifth resistor R5.

[0134] The second type of sensor 112 can be equivalent to a sensor resistor. The first end of the seventh resistor R7 is connected to the first voltage terminal Vdd1, the second end of the seventh resistor R7 is connected to one end of the sensor resistor, and the other end of the sensor resistor is grounded, that is, the seventh resistor R7 and the sensor resistor are connected in series between the first voltage terminal Vdd1 and the ground to form a series circuit. The seventh resistor R7 and the sensor resistor divide the voltage of the first voltage terminal Vdd1, that is, the voltage of the common end of the two resistors can be determined according to the resistance values ​​of the seventh resistor R7 and the sensor resistor and the voltage of the first voltage terminal Vdd1. The first end of the eighth resistor R8 is connected to the common end of the seventh resistor R7 and the sensor resistor, and the second end of the eighth resistor R8 is connected to the negative input terminal of the second amplifier OP2. After determining the voltage of the common end of the seventh resistor R7 and the sensor resistor, the voltage of the negative input terminal of the second amplifier OP2 can be determined according to the voltage of the common end and the resistance value of the eighth resistor R8.

[0135] It can be understood that the voltage at the positive input terminal of the second amplifier OP2 is fixed; and the second type of sensor 112 has different equivalent sensor resistances according to different collected gas concentrations, resulting in different voltage division conditions of the seventh resistor R7 and the sensor resistor on the voltage of the first voltage terminal Vdd1. Therefore, the voltage at the common terminal of the seventh resistor R7 and the sensor resistor is different, and the voltage at the negative input terminal of the second amplifier OP2 also changes accordingly.

[0136] The voltage of the first voltage terminal may be 3.3V.

[0137] In the technical solution of the embodiment of the present application, a resistance divider circuit is formed by the fourth resistor, the fifth resistor, the sixth resistor, the seventh resistor and the eighth resistor, which can realize the conversion of the response signal so that the second amplifier can amplify the converted signal, thereby obtaining a relatively complete and pure processed signal through the subsequent circuit.

[0138] According to some embodiments of the present application, referring to Fig.10 The signal amplifying circuit 1221 further includes a first decoupling capacitor Cx1 and a second decoupling capacitor Cx2; a first end of the first decoupling capacitor Cx1 is connected to the positive power supply terminal of the second amplifier OP2, and a second end of the first decoupling capacitor Cx1 is grounded; a first end of the second decoupling capacitor Cx2 is connected to the negative power supply terminal of the second amplifier OP2.

[0139] In the embodiment of the present application, the second amplifier OP2 may include a positive power supply terminal and a negative power supply terminal in addition to a positive input terminal, a negative input terminal, an output terminal and a setting terminal. The positive power supply terminal of the second amplifier OP2 is connected to the third voltage terminal Vdd3, and the negative power supply terminal of the second amplifier OP2 is connected to the fourth voltage terminal Vdd4.

[0140] The signal amplifying circuit 1221 further includes a first decoupling capacitor Cx1 and a second decoupling capacitor Cx2. The first decoupling capacitor Cx1 is connected between the positive power supply terminal of the second amplifier OP2 and the analog ground AGND, and the second decoupling capacitor Cx2 is connected between the negative power supply terminal of the second amplifier OP2 and the analog ground AGND. The decoupling capacitor can reduce power supply ripple. There can be multiple first decoupling capacitors Cx1 and multiple second decoupling capacitors Cx2, such as Fig.10 In the embodiment, there are two first decoupling capacitors Cx1 and two second decoupling capacitors Cx2. The capacitance values ​​of the first decoupling capacitor Cx1 and the second decoupling capacitor Cx2 can be set according to actual conditions.

[0141] The voltages of the third voltage terminal Vdd3 and the fourth voltage terminal Vdd4 are opposite. The voltage of the third voltage terminal Vdd3 may be 5V, and the voltage of the fourth voltage terminal Vdd4 may be -5V.

[0142] In the technical solution of the embodiment of the present application, the signal amplifying circuit also includes a first decoupling capacitor and a second decoupling capacitor. The decoupling capacitor can reduce power supply ripple, reduce noise interference, and make the signal amplifying circuit work more stably.

[0143] According to some embodiments of the present application, referring to Fig.11 The third processing circuit 123 includes a switch circuit 1231, a data processing chip 1232 and a burning interface 1233; the switch circuit 1231 is connected to the selection terminal PB of the data processing chip 1232; the first input terminal PA1 of the data processing chip 1232 is connected to the output terminal of the first processing circuit 121, the second input terminal PA2 of the data processing chip 1232 is connected to the output terminal of the second processing circuit 122, and the burning terminal SW of the data processing chip 1232 is connected to the burning interface 1233; the data processing chip 1232 is used to perform analog-to-digital conversion on the processing signal to obtain a conversion signal, and use the pre-acquired gas detection model to process the conversion signal to obtain detection data.

[0144] In the embodiment of the present application, the third processing circuit 123 includes a switch circuit 1231 and a data processing chip 1232. The switch circuit 1231 is connected to the gate terminal PB of the data processing chip 1232. According to the different switch states in the switch circuit 1231, the data processing chip 1232 is in a gated or non-gated state. The data processing chip 1232 can only perform data processing when it is in the gated state.

[0145] The switch circuit 1231 can be a dial switch circuit 1231, refer to Fig.12 The switch circuit 1231 includes an 8-pin dip switch and a resistor PR. The OFF ends of the dip switches are grounded, the ON ends of the dip switches are respectively connected to the strobe ends PB3, PB4, PB5, PB6 of the data processing chip 1232 and the first end of the resistor PR, and the second end of the resistor PR is connected to the first voltage end Vdd1.

[0146] The 8-pin DIP switch can realize address coding between 0000 and 1111. Therefore, the switch circuit 1231 can not only realize the function of selecting the data processing chip 1232, but also output the address coding, so that the data processing chip 1232 can realize different data processing according to different address coding.

[0147] The third processing circuit 123 also includes a burning interface 1233. Fig.13, port 1 of the burning interface 1233 is connected to the digital ground DGND, ports 2 and 3 are respectively connected to the burning terminals SWCLK and SWDIO of the data processing chip 1232, and port 4 is connected to the first voltage terminal Vdd1. A capacitor can also be connected between port 1 and port 4. The burning interface 1233 can connect an external burning device to the data processing chip 1232, and perform a burning operation on the data processing chip 1232 through the burning device. For example, the program, model, etc. required for the data processing chip 1232 to perform data processing are burned into the data processing chip 1232.

[0148] The first input terminal PA1 of the data processing chip 1232 is connected to the output terminal of the first processing circuit 121, and the second input terminal PA2 of the data processing chip 1232 is connected to the output terminal of the second processing circuit 122. In practical applications, the data processing chip 1232 may include an analog-to-digital converter (ADC), which performs analog-to-digital conversion on the processing signal to obtain a conversion signal after receiving the processing signal from the first processing circuit 121 and the second processing circuit 122. The conversion signal has a corresponding relationship with the actual gas concentration and can be used to determine whether there is a gas leak at a preset position of the battery pack.

[0149] Optionally, after obtaining the conversion signal, the data processing chip 1232 may process the conversion signal using a pre-acquired gas detection model to obtain detection data. That is, the data processing chip 1232 pre-acquires the gas detection model, and after performing analog-to-digital conversion on the processed signal to obtain the conversion signal, the conversion signal is input into the gas detection model to obtain the detection data output by the gas detection model. The detection data may be the gas concentration, which is used to determine whether there is a gas leak at a preset position of the battery pack.

[0150] In the above embodiment, the third processing circuit includes a switch circuit, a data processing chip and a burning interface; the data processing chip performs analog-to-digital conversion on the processing signal to obtain a conversion signal, and uses the pre-acquired gas detection model to process the conversion signal to obtain detection data. In the technical solution of the embodiment of the present application, the data processing chip is used for data processing, which is not only efficient but also accurate, and the switch circuit and the burning interface can assist the data processing chip in working and realizing multiple functions, which can further improve the flexibility and applicability of the battery pack detection system.

[0151] According to some embodiments of the present application, referring to Fig.14The third processing circuit 123 also includes a standard clock circuit 1234, a decoupling capacitor circuit 1235 and a reset circuit 1236; the standard clock circuit 1234 is connected to the clock signal terminal OSC of the data processing chip 1232; the first end of the decoupling capacitor circuit 1235 is connected to the power supply terminal VDD and the first voltage terminal Vdd1 of the data processing chip 1232, and the second end of the decoupling capacitor circuit 1235 is grounded; the output end of the reset circuit 1236 is connected to the reset terminal NRST of the data processing chip 1232.

[0152] In the embodiment of the present application, the third processing circuit 123 may further include a standard clock circuit 1234, and the standard clock circuit 1234 is connected to the clock signal terminals OSCIN and OSCOUT of the data processing chip 1232. Fig.15 The standard clock circuit 1234 includes a crystal oscillator Y1 and a capacitor. The standard clock circuit 1234 can provide a standard clock signal for the data processing chip 1232 so that the data processing chip 1232 can use it when performing digital signal processing.

[0153] The third processing circuit 123 further includes a decoupling capacitor circuit 1235, and the decoupling capacitor circuit 1235 is connected between the power supply terminal VDD of the data processing chip 1232 and the ground. Fig.16 The data processing chip 1232 includes multiple power supply terminals VDD, the decoupling capacitor circuit 1235 includes multiple decoupling capacitors, and one power supply terminal of the data processing chip 1232 can be connected to one or more decoupling capacitors. The resistance value of the decoupling capacitor can be set according to actual conditions.

[0154] The third processing circuit 123 further includes a reset circuit 1236, the output end of which is connected to the reset end NRST of the data processing chip 1232. The signal output by the reset circuit 1236 can reset the data processing chip 1232. Fig.17 , the common end of the reset resistor Rr and the reset capacitor Cr is connected to the reset end of the data processing chip 1232 .

[0155] In the technical solution of the embodiment of the present application, the standard clock circuit in the third processing circuit can provide a standard clock signal for the data processing chip, the decoupling capacitor circuit can reduce power supply ripple and reduce noise interference, and the reset circuit can reset the data processing chip and restore it to its initial state.

[0156] According to some embodiments of the present application, referring to Fig.18 The battery pack detection system also includes a power supply circuit 13; the power supply circuit 13 is connected to the sensor circuit 11 and the signal processing circuit 12 respectively; the power supply circuit 13 is used to supply power to the sensor circuit 11 and the signal processing circuit 12 respectively.

[0157] In the embodiment of the present application, the battery pack detection system further includes a power supply circuit 13, which is respectively connected to the sensor circuit 11, the signal processing circuit 12 and a power supply device outside the system. The power supply circuit 13 can convert the power supply voltage of the power supply device, thereby providing a suitable power supply voltage for the sensor circuit 11 and the signal processing circuit 12 respectively.

[0158] In some embodiments of the present application, reference Fig.19 The power supply circuit 13 includes a protection circuit 131 and a voltage conversion circuit 132; the protection circuit 131 is respectively connected to the power supply device outside the system and the voltage conversion circuit 132; the voltage conversion circuit 132 is respectively connected to the sensor circuit 11 and the signal processing circuit 12; the voltage conversion circuit 132 is used to convert the power supply voltage of the power supply device, and use the converted voltage to power the sensor circuit 11 and the signal processing circuit 12.

[0159] In the embodiment of the present application, the power supply circuit 13 includes a protection circuit 131, which is respectively connected to a power supply device outside the system and a voltage conversion circuit 132. In the case of abnormal power supply voltage, such as the positive and negative poles of the power supply device are connected in reverse with the positive and negative poles of the power supply circuit, or the output voltage of the power supply device is too high, the protection circuit 131 protects the battery pack detection system.

[0160] The power supply circuit 13 also includes a voltage conversion circuit 132. In addition to being connected to the protection circuit 131, the voltage conversion circuit 132 is also connected to the sensor circuit 11 and the signal processing circuit 12. When the power supply voltage is normal, the protection circuit 131 transmits the power supply voltage of the power supply device to the voltage conversion circuit 132, and the voltage conversion circuit 132 converts the power supply voltage. The power supply voltage required by the sensor circuit 11 is obtained by conversion, and the sensor circuit 11 is powered; the power supply voltage of the signal processing circuit 12 is obtained by conversion, and the signal processing circuit 12 is powered.

[0161] In the technical solution of the embodiment of the present application, the protection circuit of the power supply circuit can protect the battery pack detection system, and the voltage conversion circuit can convert the supply voltage to power the sensor circuit and the signal processing circuit, so that the battery pack detection system can work normally.

[0162] According to some embodiments of the present application, the voltage conversion circuit 132 includes multiple sub-conversion circuits, different sub-conversion circuits output different voltages, and each sub-conversion circuit is connected to at least one of the sensor circuit 11 and the signal processing circuit 12.

[0163] In the embodiment of the present application, a plurality of different power supply voltages are required in the battery pack detection system, for example, the heating voltage and power supply voltage of the gas sensor in the sensor circuit 11, the power supply voltage of the first amplifier OP1 and the power supply voltage of the second discharger in the signal processing circuit 12. The voltage conversion circuit 132 includes a plurality of sub-conversion circuits, each of which is connected to at least one of the sensor circuit 11 and the signal processing circuit 12. Different sub-conversion circuits can perform different conversions and output different voltages, thereby powering the sensor circuit 11 and the signal processing circuit 12.

[0164] Reference Fig. 20 The voltage conversion circuit 132 includes a first sub-conversion circuit 1321, a second sub-conversion circuit 1322, a third sub-conversion circuit 1323, and a fourth sub-conversion circuit 1324. The input end of the first sub-conversion circuit 1321 is connected to the protection circuit 131, and the output end of the first sub-conversion circuit 1321 is respectively connected to the input end of the second sub-conversion circuit 1322, the input end of the third sub-conversion circuit 1323, the input end of the fourth sub-conversion circuit 1324, and the signal processing circuit 12. The output end of the second sub-conversion circuit 1322 is connected to the signal processing circuit 12, the output end of the third sub-conversion circuit 1323 is respectively connected to the sensor circuit 11 and the signal processing circuit 12, and the output end of the fourth sub-conversion circuit 1324 is connected to the sensor circuit 11.

[0165] In actual applications, the protection circuit 131 transmits the power supply voltage of the power supply device to the first sub-conversion circuit 1321, and the first sub-conversion circuit 1321 converts the power supply voltage; then, the second sub-conversion circuit 1322 converts the voltage output by the first sub-conversion circuit 1321; the third sub-conversion circuit 1323 converts the voltage output by the first sub-conversion circuit 1321; and the fourth sub-conversion circuit 1324 converts the voltage output by the first sub-conversion circuit 1321.

[0166] For example, the power supply voltage is 24V, the first sub-conversion circuit 1321 converts the 24V voltage to obtain a 5V voltage; then, the second sub-conversion circuit 1322 converts the 5V voltage to obtain a -5V voltage; the third sub-conversion circuit 1323 converts the 5V voltage to obtain a 3.3V voltage; the fourth sub-conversion circuit 1324 converts the 5V voltage to obtain a 2.5V voltage. Among them, the heating voltage of the gas sensor is 2.5V, the power supply voltage is 3.3V, the power supply voltage of the first amplifier OP1 is 3.3V, and the power supply voltage of the second amplifier OP2 is 5V and -5V.

[0167] Reference Fig.21The first sub-conversion circuit 1321 may be composed of a voltage conversion chip, a voltage stabilizing diode, an inductor and a capacitor, and the first sub-conversion circuit 1321 may also include a light emitting diode, and the light emitting diode emits light when the first sub-conversion circuit 1321 works normally. The second sub-conversion circuit 1322, the third sub-conversion circuit 1323 and the fourth sub-conversion circuit 1324 may all be composed of a voltage conversion chip and a capacitor.

[0168] In practical applications, the first sub-conversion circuit 1321 , the second sub-conversion circuit 1322 , the third sub-conversion circuit 1323 and the fourth sub-conversion circuit 1324 may use the same voltage conversion chip or different voltage conversion chips.

[0169] The capacitance value of each capacitor in each sub-conversion circuit can be set according to actual conditions.

[0170] In the above embodiment, the voltage conversion circuit includes multiple sub-conversion circuits, and different sub-conversion circuits output different voltages. In the technical solution of the embodiment of the present application, different power supply voltages are obtained through multiple sub-conversion circuits to meet the power supply requirements of the sensor circuit and the signal processing circuit.

[0171] According to some embodiments of the present application, referring to Fig. 22 The protection circuit 131 includes a power supply interface P6, a diode D1, a transient suppression diode D2 and a common mode inductor L; the cathode of the diode D1 is connected to the power supply interface P6, and the anode of the diode D1 is grounded; the first end of the transient suppression diode D2 is connected to the power supply interface P6, and the second end of the transient suppression diode D2 is grounded; the first end of the common mode inductor L is connected to the voltage conversion circuit 132, the second end and the fourth end of the common mode inductor L are both grounded, and the third end of the common mode inductor L is connected to the power supply interface P6.

[0172] In the embodiment of the present application, the protection circuit 131 includes a power supply interface P6, a diode D1, a transient suppression diode D2 and a common mode inductor L. The power supply interface P6 can be connected to a power supply device outside the system to receive a power supply voltage. In the case of an abnormal power supply voltage, the diode D1, the transient suppression diode D2 and the common mode inductor L can respectively prevent the power supply voltage from being transmitted to the voltage conversion circuit 132, thereby protecting the battery pack detection system.

[0173] Reference Fig. 22 The protection circuit 131 may also include a fuse F, an overvoltage protection resistor RV, a capacitor C and other components. It should be noted that the components in the protection circuit 131 are not limited to the above description and can be set according to actual conditions.

[0174] In the technical solution of the embodiment of the present application, the protection circuit includes a power supply interface, a diode, a transient suppression diode and a common-mode inductor. These components can protect the battery pack detection system when the power supply voltage is abnormal, thereby improving the safety and reliability of the battery pack detection system.

[0175] According to some embodiments of the present application, referring to Fig.23 The battery pack detection system also includes a communication circuit 14, which is connected to the signal processing circuit 12; the communication circuit 14 is used to transmit the detection data output by the signal processing circuit 12 to the host computer.

[0176] In the embodiment of the present application, the battery pack detection system further includes a communication circuit 14, which is connected to the signal processing circuit 12. The communication circuit 14 can communicate with a host computer or other equipment outside the battery pack detection system. After the signal processing circuit 12 performs data processing to obtain detection data, it transmits the detection data to the communication circuit 14. The communication circuit 14 communicates with the host computer and transmits the detection data to the host computer. The host computer receives the detection data and determines whether there is a gas leak at a preset position of the battery pack according to the detection data.

[0177] In some embodiments of the present application, reference Fig.24 The communication circuit 14 includes a communication chip 141 and an antenna interface P7; the data input terminal RXD and the data output terminal TXD of the communication chip 141 are both connected to the signal processing circuit 12, and the antenna terminal ANT of the communication chip 141 is connected to the antenna interface P7.

[0178] In the embodiment of the present application, the communication circuit 14 may include a communication chip 141 and an antenna interface P7, and the data input terminal RXD and the data output terminal TXD of the communication chip 141 are both connected to the signal processing circuit 12. In the above embodiment, the signal processing circuit 12 includes a third processing circuit 123, and the third processing circuit 123 includes a data processing chip 1232. The data input terminal RXD of the communication chip 141 is connected to the data output terminal TXD of the data processing chip 1232, and the data output terminal TXD of the communication chip 141 is connected to the data input terminal RXD of the data processing chip 1232. The antenna terminal ANT of the communication chip 141 is connected to the antenna interface P7, and the antenna interface P7 can be connected to an external antenna device.

[0179] In actual applications, after the data processing chip 1232 performs analog-to-digital conversion, the converted signal is transmitted to the data input terminal RXD of the communication chip 141 through the data output terminal TXD of the data processing chip 1232. The communication chip 141 transmits the converted signal to the host computer through communication with the host computer. The host computer inputs the converted signal into the pre-trained gas detection model to obtain the actual gas concentration output by the gas detection model; then, the host computer determines whether there is a gas leak at the preset position of the battery pack based on the actual gas concentration and the critical threshold.

[0180] Alternatively, after the data processing chip 1232 performs analog-to-digital conversion to obtain the conversion signal, it inputs the conversion signal into the pre-acquired gas detection model to obtain the actual gas concentration output by the gas detection model. Afterwards, the data processing chip 1232 transmits the actual gas concentration to the data input terminal RXD of the communication chip 141 through the data output port TXD. The communication chip 141 transmits the actual gas concentration to the host computer through communication with the host computer. The host computer determines whether there is a gas leak at the preset position of the battery pack based on the received actual gas concentration and the critical threshold.

[0181] In the technical solution of the embodiment of the present application, the antenna interface in the communication circuit can be connected to an external antenna device, so that the communication chip can communicate with the host computer and transmit the signal or data obtained by the battery pack detection system to the host computer, so that the host computer can determine whether there is a gas leakage based on the signal or data.

[0182] According to some embodiments of the present application, referring to Fig.25 , a battery pack detection method is provided, and the method is applied to the battery pack detection system of the above embodiment, which may include the following steps:

[0183] Step 201 , performing gas detection on a preset position of the battery pack to obtain a plurality of response signals.

[0184] The battery pack detection system includes a sensor circuit, which includes multiple types of gas sensors. The multiple types of gas sensors detect gas at preset positions of the battery pack to obtain multiple response signals.

[0185] For example, the sensor circuit includes two MEMS sensors for detecting hydrogen, one ceramic sensor for detecting hydrogen, and one ceramic sensor for detecting VOCs. The four sensors simultaneously detect gas at preset positions of the battery pack and obtain four response signals.

[0186] Step 202: Process each response signal to obtain a conversion signal.

[0187] The battery pack detection system includes a signal processing circuit, which includes a first processing circuit, a second processing circuit and a third processing circuit. The multiple response signals obtained by the sensor circuit for gas detection are respectively transmitted to the first processing circuit and the second processing circuit for preprocessing to obtain processed signals. After that, the processed signals are transmitted to the third processing circuit for analog-to-digital conversion processing to obtain converted signals.

[0188] The first processing circuit includes a first filtering circuit, and a response signal input to the first processing circuit is filtered through the first filtering circuit to obtain a first processing signal. The second processing circuit includes a signal amplifying circuit and a second filtering circuit, and a response signal input to the second processing signal is amplified through the signal amplifying circuit and then filtered through the second filtering circuit to obtain a second processing signal. The third processing circuit includes a data processing chip, and the data processing chip includes an analog-to-digital converter. The first processing signal and the second processing signal are transmitted to the data processing chip, and the analog-to-digital converter in the data processing chip performs analog-to-digital conversion on the first processing signal and the second processing signal to obtain a conversion signal.

[0189] For example, the response signals of two MEMS sensors for detecting hydrogen are respectively input into the first processing circuit, and are filtered by two first filter circuits in the first processing circuit to obtain two first processing signals; the response signals of one ceramic sensor for detecting hydrogen and one ceramic sensor for detecting VOCs are respectively input into the second processing circuit, and are first amplified by two signal amplification circuits in the second processing circuit, and then filtered by two second filter circuits in the second processing circuit to obtain two second processing signals. Afterwards, the two first processing signals and the two second processing signals are input into the data processing chip of the third processing circuit for analog-to-digital conversion processing to obtain four conversion signals.

[0190] Step 203, input the conversion signal into the pre-acquired gas detection model to obtain detection data output by the gas detection model, and the detection data is used to determine whether there is a gas leak at a preset position of the battery pack.

[0191] Based on the above embodiment, the data processing chip pre-acquires the gas detection model, and after performing analog-to-digital conversion to obtain the conversion signal, the conversion signal is input into the gas detection model to obtain the detection data output by the gas detection model. The data processing chip can directly determine whether there is a gas leak at the preset position of the battery pack based on the detection data, or transmit the detection data to the host computer through the communication chip in the communication circuit, and the host computer determines whether there is a gas leak at the preset position of the battery pack based on the detection data.

[0192] It can be understood that qualitative and quantitative detection of the mixed gas can be achieved through the sensor circuit, thereby achieving high-precision and stable testing of the target gas (hydrogen).

[0193] In the above embodiment, gas detection is performed on a preset position of the battery pack to obtain multiple response signals; each response signal is processed to obtain a conversion signal; the conversion signal is input into a pre-acquired gas detection model to obtain detection data output by the gas detection model. In the technical solution of the embodiment of the present application, the response signal of hydrogen and the response signals of other gases can be obtained from different angles, and the multiple response signals can corroborate each other, which is helpful to identify and eliminate noise, thereby reducing noise interference and improving detection accuracy and detection effect.

[0194] According to some embodiments of the present application, the gas detection model can be trained by a data processing chip or by a host computer. Fig.26 , model training can include:

[0195] Step 301 , filtering a plurality of conversion signals collected by a battery pack detection system to obtain a plurality of filtered conversion signals.

[0196] Before model training, the battery pack detection system performs multiple gas detections, and each gas detection can obtain multiple conversion signals. Afterwards, the conversion signals obtained from multiple gas detections are subjected to filtering processing such as denoising, data cleaning, and outlier removal to obtain filtered conversion signals.

[0197] The above denoising can use denoising algorithms such as sliding average and band filter to remove noise in the signal. The above data cleaning can remove inappropriate, irrelevant or erroneous signal entries. The above outlier removal can use statistical algorithms such as IQR, Z-score, etc. to identify and remove outliers in the signal.

[0198] It should be noted that denoising and outlier removal are not limited to the above algorithms. In practical applications, other algorithms can also be used.

[0199] Step 302: Perform feature extraction processing on the multiple filtered conversion signals to obtain multiple feature data.

[0200] After obtaining the filtered conversion signal, a feature extraction algorithm may be used to extract features from the filtered conversion signal to obtain feature data. It is understandable that after obtaining multiple feature data, the multiple feature data may be used to form a data set, thereby using the data set for model training.

[0201] The above feature extraction algorithm may include but is not limited to principal component analysis (PCA), Fourier transform, etc.

[0202] In some embodiments, before feature extraction, data sampling may be performed on the multiple filtered conversion signals, and part of the signals may be sampled from the multiple filtered conversion signals, thereby improving the representativeness of the data set.

[0203] Step 303: Perform model training based on multiple feature data to obtain a gas detection model.

[0204] The data set composed of multiple feature data can be divided into a training data set and a validation data set. During the training process, the training data set is used to train the model to obtain an initial detection model; then, the validation data set is used to further train the initial detection model, adjust the model parameters in the initial detection model, and obtain a gas detection model.

[0205] The gas detection model can be a support vector machine, a decision tree, a neural network, etc., and the parameter adjustment process can be a grid search, a random search, or a Bayesian optimization. It should be noted that the gas detection model is not limited to the above description, and other model structures can also be used; the parameter adjustment process is not limited to the above method, and other methods can also be used.

[0206] In the above embodiment, the multiple conversion signals collected by the battery pack detection system are filtered to obtain multiple filtered conversion signals; the multiple filtered conversion signals are subjected to feature extraction to obtain multiple feature data; the model is trained based on the multiple feature data to obtain a gas detection model. In the technical solution of the embodiment of the present application, the battery pack detection system can be used to collect data to obtain a data set, so as to better perform model training and further improve the accuracy of gas detection.

[0207] It should be understood that, although the various steps in the above flowchart are displayed in sequence according to the indication of the arrows, these steps are not necessarily executed in sequence according to the order indicated by the arrows. Unless there is a clear description in this article, the execution of these steps is not strictly limited in order, and these steps can be executed in other orders. Moreover, at least a part of the steps in the above flowchart may include multiple steps or multiple stages, and these steps or stages are not necessarily executed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily to be carried out in sequence, but can be executed in turn or alternately with other steps or at least a part of the steps or stages in other steps.

[0208] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to the memory, database or other medium used in the embodiments provided in the present application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetoresistive random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. As an illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM). The database involved in each embodiment provided in this application may include at least one of a relational database and a non-relational database. Non-relational databases may include distributed databases based on blockchains, etc., but are not limited to this. The processor involved in each embodiment provided in this application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, etc., but are not limited to this.

[0209] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0210] The above-described embodiments only express several implementation methods of the present application, which is convenient for understanding the technical solutions of the present application in detail, but cannot be understood as limiting the scope of protection of the invention patent. It should be pointed out that for ordinary technicians in this field, without departing from the concept of the present application, several modifications and improvements can be made, which all belong to the protection scope of the present application. It should be understood that the technical solutions obtained by those skilled in the art through logical analysis, reasoning or limited experiments on the basis of the technical solutions provided in the present application are all within the protection scope of the attached claims described in the present application. Therefore, the protection scope of the patent of this application shall be based on the contents of the attached claims, and the description and drawings can be used to explain the contents of the claims.

Claims

1. A battery pack detection system, characterized in that: The battery pack detection system includes a sensor circuit and a signal processing circuit; the sensor circuit is connected to the signal processing circuit; the sensor circuit includes multiple types of gas sensors, the types include construction types and gas detection types, and the multiple gas sensors are arranged according to the types; The sensor circuit is used to detect gas at a preset position of the battery pack to obtain a plurality of response signals; The signal processing circuit is used to process the response signal to obtain detection data, and the detection data is used to determine whether there is a gas leak at a preset position of the battery pack.

2. The battery pack detection system according to claim 1, characterized in that: The sensor circuit includes a first type of sensor and a second type of sensor of different construction types; the second type of sensor includes a gas sensor of different gas detection types, and the signal processing circuit includes a first processing circuit, a second processing circuit and a third processing circuit; The first type of sensor is connected to the first processing circuit, the second type of sensor is connected to the second processing circuit, and the first processing circuit and the second processing circuit are both connected to the third processing circuit; The first processing circuit and the second processing circuit are both used to pre-process the response signal to obtain a processed signal; The third processing circuit is used to perform data processing on the processing signal to obtain the detection data.

3. The battery pack detection system according to claim 2, characterized in that: The first type of sensor is a micro-electromechanical system MEMS sensor, and the first processing circuit includes a first filtering circuit; The output end of the first type of sensor is connected to the input end of the first filtering circuit; The output end of the first filtering circuit is connected to the input end of the third processing circuit.

4. The battery pack detection system according to claim 3, characterized in that: The first filtering circuit includes a first amplifier, a first resistor, a second resistor, a first capacitor and a second capacitor; The first end of the first resistor is connected to the output end of the first type of sensor, and the second end of the first resistor is connected to the first end of the second resistor; The second end of the second resistor is connected to the positive input end of the first amplifier; The negative input terminal of the first amplifier is connected to the output terminal of the first amplifier; A first end of the first capacitor is connected to the positive input end of the first amplifier, and a second end of the first capacitor is grounded; A first end of the second capacitor is connected to a common end of the first resistor and the second resistor, and a second end of the second capacitor is connected to an output end of the first amplifier.

5. The battery pack detection system according to claim 3, characterized in that: The second type of sensor is a ceramic sensor, and the second processing circuit includes a signal amplification circuit and a second filtering circuit; The output end of the second type of sensor is connected to the input end of the signal amplifying circuit; The output end of the signal amplifying circuit is connected to the input end of the second filtering circuit; The output end of the second filtering circuit is connected to the input end of the third processing circuit.

6. The battery pack detection system according to claim 5, characterized in that: The signal amplifying circuit comprises a resistor voltage divider circuit, a second amplifier and a third resistor; The resistor voltage divider circuit is connected to the output end of the second type sensor and the input end of the second amplifier respectively; The output end of the second amplifier is connected to the input end of the second filter circuit; Two ends of the third resistor are connected to two setting ends of the second amplifier respectively.

7. The battery pack detection system according to claim 6, characterized in that: The resistor voltage divider circuit includes a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor and an eighth resistor; The first end of the fourth resistor is connected to the first voltage end, and the second end of the fourth resistor is connected to the first end of the fifth resistor and the first end of the sixth resistor respectively; The second end of the fifth resistor is connected to the positive input end of the second amplifier; The second end of the sixth resistor is grounded; The first end of the seventh resistor is connected to the first voltage end, and the second end of the seventh resistor is connected to the output end of the second type sensor and the first end of the eighth resistor respectively; The second end of the eighth resistor is connected to the negative input end of the second amplifier.

8. The battery pack detection system according to claim 6, characterized in that: The signal amplifying circuit further includes a first decoupling capacitor and a second decoupling capacitor; A first end of the first decoupling capacitor is connected to the positive power supply terminal of the second amplifier, and a second end of the first decoupling capacitor is grounded; A first terminal of the second decoupling capacitor is connected to a negative power supply terminal of the second amplifier.

9. The battery pack detection system according to claim 2, characterized in that: The third processing circuit includes a switch circuit, a data processing chip and a burning interface; The switch circuit is connected to the strobe terminal of the data processing chip; The first input terminal of the data processing chip is connected to the output terminal of the first processing circuit, the second input terminal of the data processing chip is connected to the output terminal of the second processing circuit, and the burning terminal of the data processing chip is connected to the burning interface; The data processing chip is used to perform analog-to-digital conversion on the processed signal to obtain a conversion signal, and to process the conversion signal using a pre-acquired gas detection model to obtain the detection data.

10. The battery pack detection system according to claim 9, characterized in that: The third processing circuit also includes a standard clock circuit, a decoupling capacitor circuit and a reset circuit; The standard clock circuit is connected to the clock signal terminal of the data processing chip; A first end of the decoupling capacitor circuit is connected to a power supply end and a first voltage end of the data processing chip, and a second end of the decoupling capacitor circuit is grounded; The output end of the reset circuit is connected to the reset end of the data processing chip.

11. The battery pack detection system according to any one of claims 1 to 10, characterized in that: The battery pack detection system further includes a power supply circuit; the power supply circuit is connected to the sensor circuit and the signal processing circuit respectively; The power supply circuit is used to supply power to the sensor circuit and the signal processing circuit respectively.

12. The battery pack detection system according to claim 11, characterized in that: The power supply circuit includes a protection circuit and a voltage conversion circuit; The protection circuit is respectively connected to a power supply device outside the system and the voltage conversion circuit; The voltage conversion circuit is connected to the sensor circuit and the signal processing circuit respectively; The voltage conversion circuit is used to convert the power supply voltage of the power supply device, and use the converted voltage to power the sensor circuit and the signal processing circuit.

13. The battery pack detection system according to claim 12, characterized in that: The voltage conversion circuit includes a plurality of sub-conversion circuits, different sub-conversion circuits output different voltages, and each of the sub-conversion circuits is connected to at least one of the sensor circuit and the signal processing circuit.

14. The battery pack detection system according to claim 12, characterized in that: The protection circuit includes a power supply interface, a diode, a transient suppression diode and a common mode inductor; The cathode of the diode is connected to the power supply interface, and the anode of the diode is grounded; A first end of the transient suppression diode is connected to the power supply interface, and a second end of the transient suppression diode is grounded; The first end of the common mode inductor is connected to the voltage conversion circuit, the second end and the fourth end of the common mode inductor are both grounded, and the third end of the common mode inductor is connected to the power supply interface.

15. The battery pack detection system according to any one of claims 1 to 10, characterized in that: The battery pack detection system further includes a communication circuit, wherein the communication circuit is connected to the signal processing circuit; The communication circuit is used to transmit the detection data output by the signal processing circuit to a host computer.

16. The battery pack detection system according to claim 15, characterized in that: The communication circuit includes a communication chip and an antenna interface; The data input terminal and the data output terminal of the communication chip are both connected to the signal processing circuit, and the antenna terminal of the communication chip is connected to the antenna interface.

17. A battery pack detection method, characterized in that: Applied to the battery pack detection system according to any one of claims 1 to 16, the method comprising: Performing gas detection on a preset position of the battery pack to obtain a plurality of response signals; Processing each of the response signals respectively to obtain a conversion signal; The conversion signal is input into a pre-acquired gas detection model to obtain detection data output by the gas detection model, and the detection data is used to determine whether there is a gas leak at a preset position of the battery pack.

18. The method according to claim 17, characterized in that The method further comprises: Filtering the multiple conversion signals collected by the battery pack detection system to obtain multiple filtered conversion signals; Performing feature extraction processing on the plurality of filtered conversion signals to obtain a plurality of feature data; Model training is performed based on the plurality of characteristic data to obtain the gas detection model.

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