Safety valve detection circuit, detection method, controller and medium

Abstract

The invention discloses a safety valve detection circuit, a detection method, a controller and a medium, and the circuit comprises a temperature detection module which comprises a first divider resistor, a second divider resistor and a temperature sensor used for detecting the temperature of a battery; the valve opening detection module comprises a valve opening detection line and an impulsive force absorption element arranged on the battery safety valve, and the valve opening detection module is configured to generate a valve opening signal when the electrolyte in the battery safety valve is sprayed out and impacts the valve opening detection line; the acquisition module is electrically connected with the temperature detection module, and the acquisition module is configured to acquire a valve opening signal from a target sampling point; and the processing module is electrically connected with the acquisition module, and the processing module is configured to receive the valve opening signal and process the valve opening signal to determine whether the battery safety valve is opened or not. Whether the battery safety valve is opened or not can be rapidly and accurately detected, the risk of thermal runaway is effectively reduced, and the safety of the battery module is improved.

Description

Technical Field

[0001] This application relates to the technical field of battery energy storage, and in particular to a safety valve detection circuit, a detection method, a controller, and a medium. Background Art

[0002] With the rapid development of the new energy industry, the safety issues of electrochemical energy storage have become increasingly prominent. At present, electrochemical energy storage mainly uses lithium iron phosphate battery monomers to form modules, the modules are connected in series to form battery clusters, and the battery clusters are connected in parallel to form energy storage battery boxes. There are a large number of batteries inside the liquid-cooled module and the space is airtight. Once there are abuse behaviors such as overcharging and over-discharging of the battery, the combustible gas leaked from the faulty battery may trigger a violent explosion in the airtight space.

[0003] As the last barrier for battery explosion protection, when the internal pressure of the battery reaches the opening threshold of the safety valve, a large amount of gas inside the battery is discharged outward. At the same time, the electrolyte inside the battery will also be sprayed out with the release of pressure, causing the battery safety valve to be flushed open for pressure relief. Although the opening of the safety valve avoids battery explosion, the high-temperature electrolyte leaking together with the gas may splash onto the battery and surrounding components, posing a risk of fire and combustion. However, in the prior art, the battery management module (BMS) is mainly used to detect parameters such as the voltage, temperature, and charge and discharge current of the battery, and thermal runaway cannot be detected, which greatly affects the safe operation of the system. Summary of the Invention

[0004] The embodiments of this application provide a safety valve detection circuit, a detection method, a controller, and a medium, which can not only detect the battery temperature, but also quickly and accurately detect whether the battery safety valve is opened, effectively reduce the risk of thermal runaway, and improve the safety of the battery module.

[0005] In a first aspect, an embodiment of the present application provides a safety valve detection circuit, including a temperature detection module, an open valve detection module, a collection module, and a processing module. Among them, the temperature detection module includes a first voltage-dividing resistor, a second voltage-dividing resistor, and a temperature sensor for detecting the battery temperature. One end of the temperature sensor is connected to one end of the first voltage-dividing resistor, and the other end is connected to one end of the second voltage-dividing resistor. The other end of the first voltage-dividing resistor is grounded. The open valve detection module includes an open valve detection line and a shock absorption element provided on the battery safety valve. At least a part of the open valve detection line is adhesively connected to the shock absorption element. The open valve detection module is connected in parallel to both ends of the first voltage-dividing resistor through the open valve detection line. The open valve detection module is configured to generate an open valve signal when the electrolyte in the battery safety valve sprays out and impacts the open valve detection line. The collection module is electrically connected to the temperature detection module. The collection module is configured to collect the open valve signal from a target sampling point. The target sampling point is the connection point between the other end of the temperature sensor and one end of the second voltage-dividing resistor. The processing module is electrically connected to the collection module. The processing module is configured to receive the open valve signal and process the open valve signal to determine whether the battery safety valve has opened.

[0006] According to the safety valve detection circuit provided by some embodiments of the present invention, the shock absorption element includes a damping sheet. The battery safety valve is provided with a plurality of leakage holes. The damping sheet covers the plurality of leakage holes so that the open valve detection line passes through the central positions of the plurality of leakage holes and is connected to the other end of the first voltage-dividing resistor.

[0007] According to the safety valve detection circuit provided by some embodiments of the present invention, the collection module includes a voltage collection chip. The first collection port of the voltage collection chip is connected to the target sampling point to obtain the open valve signal. The second collection port of the collection chip is connected to the connection point between the open valve detection line and the other end of the first voltage-dividing resistor and is grounded.

[0008] According to the safety valve detection circuit provided by some embodiments of the present invention, the temperature sensor includes a thermistor, and the open valve detection line is the ground wire of the thermistor.

[0009] According to the safety valve detection circuit provided by some embodiments of the present invention, the temperature detection module further includes a reference voltage input terminal, and the reference voltage input terminal is connected to the other end of the second voltage-dividing resistor.

[0010] In a second aspect, an embodiment of the present application further provides a safety valve detection method, which is applied to the safety valve detection circuit as described in the first aspect embodiment. The method includes: Obtain a first valve opening signal and record the number of acquisitions. Among them, the first valve opening signal includes a first voltage signal collected from a first target sampling point; Calculate a first detected resistance value based on the first voltage signal; If the current number of acquisitions is greater than a preset number of acquisitions, calculate a resistance change value based on the first detected resistance value and a second detected resistance value collected in the previous acquisition of the number of acquisitions; Perform an alarm output based on the resistance change value and a first preset resistance value.

[0011] According to the safety valve detection method provided by some embodiments of the present invention, the performing an alarm output based on the resistance change value and a first preset resistance value includes: When the resistance change value is greater than the first preset resistance value, obtain a second valve opening signal. Among them, the second valve opening signal includes a second voltage signal collected from a second target sampling point, and the second target sampling point is an adjacent sampling point of the first target sampling point; Calculate a second detected resistance value based on the second voltage signal; When the second detected resistance value is less than a second preset resistance value, output a first alarm signal.

[0012] According to the safety valve detection method provided by some embodiments of the present invention, the method further includes: When the resistance change value is less than or equal to the first preset resistance value, record the first detected resistance value and calculate the battery temperature collected from the first target sampling point based on the first detected resistance value.

[0013] According to the safety valve detection method provided by some embodiments of the present invention, the method further includes: If the current number of acquisitions is equal to the preset number of acquisitions, perform an alarm output based on the first detected resistance value, a third preset resistance value, and a fourth preset resistance value.

[0014] According to the safety valve detection method provided by some embodiments of the present invention, the performing an alarm output based on the first detected resistance value, a third preset resistance value, and a fourth preset resistance value includes: When the first detected resistance value is greater than the third preset resistance value and less than the fourth preset resistance value, output a first alarm signal; When the first detected resistance value is greater than the fourth preset resistance value, output a second alarm signal.

[0015] According to the safety valve detection method provided by some embodiments of the present invention, the method further includes: When the first detected resistance value is less than the third preset resistance value, record the first detected resistance value, continue to obtain the first valve opening signal, and record the number of acquisitions.

[0016] According to the safety valve detection method provided by some embodiments of the present invention, the first warning signal indicates that the battery safety valve opens, and the second warning signal indicates that the valve opening detection line is open.

[0017] In a third aspect, an embodiment of the present application further provides a controller, including: a memory, a processor, and a computer program stored on the memory and executable on the processor. When the processor executes the computer program, the safety valve detection method described in the second aspect embodiment above is implemented.

[0018] In a fourth aspect, an embodiment of the present application further provides a computer-readable storage medium. The computer-readable storage medium stores computer-executable instructions, and the computer-executable instructions are used to cause a computer to execute the safety valve detection method described in the second aspect embodiment above.

[0019] The safety valve detection circuit, detection method, controller, and medium according to the embodiments of the present application at least have the following beneficial effects: Through the connection and matching of the temperature sensor and the voltage-dividing resistor in the temperature detection module, the battery temperature can be detected in real time to provide temperature data for the system. And the valve opening detection module is combined with the valve opening detection line and the impact absorption element arranged on the battery safety valve, and the valve opening detection line is connected in parallel at both ends of the first voltage-dividing resistor. Affected by the electrolyte ejected and impacted in the battery safety valve, a valve opening signal is generated, so that while the acquisition module collects voltage and temperature, it can collect the valve opening signal from the target sampling point and feedback it to the processing module for processing, so that it can quickly and accurately detect whether the battery safety valve is opened, effectively reduce the risk of thermal runaway, and improve the safety of the battery module.

[0020] Other features and advantages of the present application will be described in the following description, and some of them will become obvious from the description, or be understood by implementing the present application. The objectives and other advantages of the present application can be realized and obtained through the structures specifically pointed out in the description and the drawings. Description of the Drawings

[0021] The drawings are used to provide a further understanding of the technical solutions of the present application, and constitute a part of the description. Together with the embodiments of the present application, they are used to explain the technical solutions of the present application, and do not constitute a limitation to the technical solutions of the present application.

[0022] The following further illustrates the present application in conjunction with the drawings and embodiments; Figure 1It is a block diagram of the module of the safety valve detection circuit provided by an embodiment of the present application; Figure 2 It is a circuit schematic diagram of the safety valve detection circuit provided by an embodiment of the present application; Figure 3 It is a schematic structural diagram of the valve opening detection module 200 provided by an embodiment of the present application; Figure 4 It is a flowchart of the safety valve detection method provided by an embodiment of the present application; Figure 5 It is a flowchart of the safety valve detection method provided by another embodiment of the present application; Figure 6 It is a schematic diagram of the controller provided by an embodiment of the present application. Detailed implementation manners

[0023] In order to make the objectives, technical solutions and advantages of the present application more clear and understandable, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application. In addition, the features, operations or characteristics described in the specification can be combined in any appropriate manner to form various embodiments. At the same time, the steps or actions in the method description can also be adjusted or reordered in an obvious manner by those skilled in the art. Therefore, the various sequences in the specification and drawings are only for clearly describing a certain embodiment and do not mean that they are the necessary sequences unless it is stated that a certain sequence must be followed.

[0024] In the description of the present application, the meaning of several is one or more, the meaning of multiple is more than two, greater than, less than, exceeding, etc. are understood as not including the present number, above, below, within, etc. are understood as including the present number. If the first and second are described only for the purpose of distinguishing technical features, they cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence of the indicated technical features.

[0025] The serial numbers assigned to the components herein, such as "first", "second", etc., are only used to distinguish the described objects and do not have any sequential or technical meaning. And the "connection" and "coupling" mentioned in the present application, unless otherwise specified, both include direct and indirect connection (coupling).

[0026] In the description of the present application, unless otherwise clearly defined, words such as setting, installing, connecting, etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above words in the present application in combination with the specific content of the technical solution.

[0027] With the rapid development of the new energy industry, the safety issues of electrochemical energy storage have become increasingly prominent. Currently, electrochemical energy storage mainly uses lithium iron phosphate battery cells to form modules, the modules are connected in series to form battery clusters, and the battery clusters are connected in parallel to form energy storage battery boxes. There are a large number of batteries inside the liquid-cooled module and the space is airtight. Once there are abuse behaviors such as overcharging and over-discharging of the batteries, the combustible gas leaked from the faulty battery may trigger a violent explosion in the airtight space.

[0028] As the last barrier for battery explosion protection, when the internal pressure of the battery reaches the opening threshold of the safety valve, a large amount of gas inside the battery is discharged outward. At the same time, the electrolyte inside the battery will also be sprayed out with the release of pressure, causing the battery safety valve to be flushed open for pressure relief. Although the opening of the safety valve avoids battery explosion, the high-temperature electrolyte leaking together with the gas may splash onto the battery and surrounding components, posing a risk of fire and combustion. However, in the existing technology, the battery management module (BMS) is mainly used to detect parameters such as the voltage, temperature, and charge and discharge current of the battery, and thermal runaway cannot be detected, which greatly affects the safe operation of the energy storage system.

[0029] Based on the above situation, the embodiments of the present application provide a safety valve detection circuit, a detection method, a controller, and a medium, which can not only detect the battery temperature, but also quickly and accurately detect whether the battery safety valve is opened, effectively reducing the risk of thermal runaway and improving the safety of the battery module.

[0030] The following further elaborates on the embodiments of the present application with reference to the accompanying drawings.

[0031] Figure 1 It is the module principle block diagram of the safety valve detection circuit provided by the embodiments of the present application; Figure 2 It is the circuit schematic diagram of the safety valve detection circuit provided by the embodiments of the present application. Refer to Figure 1 and Figure 2, an embodiment of the first aspect of the present application provides a safety valve detection circuit, including a temperature detection module 100, an open valve detection module 200, a collection module 300, and a processing module 400. Among them, the temperature detection module 100 includes a first voltage-dividing resistor R1, a second voltage-dividing resistor R2, and a temperature sensor for detecting the battery temperature. One end of the temperature sensor is connected to one end of the first voltage-dividing resistor R1, and the other end is connected to one end of the second voltage-dividing resistor R2. The other end of the first voltage-dividing resistor R1 is grounded. It can be understood that the temperature detection module 100 in the safety valve detection circuit of the embodiment of the present application is composed of the first voltage-dividing resistor R1, the second voltage-dividing resistor R2, and the temperature sensor. The temperature sensor is connected between the first voltage-dividing resistor R1 and the second voltage-dividing resistor R2 to form a voltage-dividing circuit for converting temperature changes into voltage changes. In one embodiment, the resistance value of the first voltage-dividing resistor R1 can be 300 kΩ, and the resistance value of the second voltage-dividing resistor R2 is 10 kΩ. Alternatively, the first voltage-dividing resistor R1 and the second voltage-dividing resistor R2 can also be selected as resistors with other resistance values according to actual needs.

[0032] Figure 3 is a schematic structural diagram of the open valve detection module 200 provided by the embodiment of the present application. Refer to Figure 2 and Figure 3, the valve opening detection module 200 includes a valve opening detection line and a shock absorption element disposed on the battery safety valve. At least a part of the valve opening detection line is attached to the shock absorption element. The valve opening detection module 200 is connected in parallel to both ends of the first voltage dividing resistor R1 through the valve opening detection line. The valve opening detection module 200 is configured to generate a valve opening signal when the electrolyte in the battery safety valve sprays out and impacts the valve opening detection line. It should be noted that the valve opening detection module 200 monitors the state of the battery safety valve in real time through the combination of the valve opening detection line and the shock absorption element. The valve opening detection module 200 consists of a valve opening detection line and a shock absorption element. The shock absorption element is installed on the battery safety valve and is attached to a part of the valve opening detection line to ensure that when the electrolyte sprays out from the battery safety valve, the impact force of the electrolyte can be absorbed in time. When the impact force acts on the valve opening detection line connected to the shock absorption element, the on-off state of the valve opening detection line can be changed, for example, the valve opening detection line can be broken, and then a valve opening signal is generated. The valve opening signal can directly affect the voltage change across the voltage dividing resistor, improving the stability and reliability of the safety valve detection. Further, the valve opening detection module 200 is connected in parallel to the first voltage dividing resistor R1 through the valve opening detection line, enabling the valve opening detection module 200 to achieve electrical connection with the temperature detection module 100. Specifically, one end of the valve opening detection line of the valve opening detection module 200 is connected to the connection point D between one end of the temperature sensor and one end of the first voltage dividing resistor R1, so that the valve opening detection module 200 is respectively connected to the temperature sensor and the first voltage dividing resistor R1, and thus the temperature sensor and the valve opening detection module 200 form a loop. At the same time, the other end of the valve opening detection line is connected to the other end of the first voltage dividing resistor R1 and then grounded together, so that the first voltage dividing resistor R1 and the valve opening detection module 200 form another loop, thereby realizing the feedback monitoring of the valve opening signal.

[0033] The acquisition module 300 is electrically connected to the temperature detection module 100. The acquisition module 300 is configured to acquire the valve opening signal from the target sampling point, and the target sampling point is the connection point between the other end of the temperature sensor and one end of the second voltage dividing resistor R2. It can be understood that, as Figure 2 shown, the connection point between the other end of the temperature sensor and one end of the second voltage dividing resistor R2 is selected as the target sampling point T. The target sampling point T can be the temperature sampling point of the acquisition module 300. When the acquisition module 300 operates, it can also acquire the valve opening signal from the target sampling point T, enabling the acquisition module 300 to simultaneously obtain the temperature signal of the temperature sensor and the valve opening signal of the valve opening detection module 200. While realizing the multi-parameter safety valve detection, the hardware cost is reduced.

[0034] The processing module 400 is electrically connected to the acquisition module 300. The processing module 400 is configured to receive an open valve signal and process the open valve signal to determine whether the battery safety valve has opened. It should be noted that the processing module 400 and the acquisition module 300 achieve signal transmission through electrical connection. The open valve signal collected by the acquisition module 300 from the target sampling point is in the form of an analog signal. The acquisition module 300 can convert the analog signal into a digital signal, and then the processing module 400 performs signal processing after receiving these digital signals, such as filtering and amplification, to remove noise and enhance the signal. Then, the processing module 400 makes a logical judgment to determine whether the safety valve has opened.

[0035] According to the safety valve detection circuit provided by the embodiments of the present application, through the connection and matching of the temperature sensor and the voltage dividing resistor in the temperature detection module 100, the battery temperature can be detected in real time to provide temperature data for the system. And the open valve detection module 200 combines the open valve detection line with the impact absorption element provided on the battery safety valve, and is connected in parallel to both ends of the first voltage dividing resistor R1 through the open valve detection line. The open valve detection line is affected by the electrolyte ejected and impacted in the battery safety valve, thereby generating an open valve signal, so that the acquisition module 300 can collect the open valve signal from the target sampling point while collecting voltage and temperature and feedback it to the processing module 400 for processing, so as to quickly and accurately detect whether the battery safety valve is opened, effectively reduce the risk of thermal runaway, and improve the safety of the battery module.

[0036] Refer to Figure 2 and Figure 3 In the safety valve detection circuit provided by some embodiments of the present application, the impact absorption element includes a damping piece P. The battery safety valve is provided with a plurality of leakage holes K, and the damping piece P covers the plurality of leakage holes so that the open valve detection line L passes through the central positions of the plurality of leakage holes K and is connected to the other end of the first voltage dividing resistor R1. It can be understood that when the battery safety valve opens, the electrolyte sprays out from the plurality of leakage holes K and impacts the open valve detection line L. The damping piece P absorbs the impact force of the spray, so that the open valve detection line L is impacted and changes its on-off state. For example, the open valve detection line L may be broken by the electrolyte, and then an open valve signal is generated. Further, by aligning the open valve detection line L with the central positions of the leakage holes K, the spraying of the electrolyte can be quickly responded to, and the sensitivity and reliability of the safety valve open valve detection are improved. In one embodiment, the number of leakage holes K provided on the battery safety valve is four, which are located at the upper left, upper right, lower left, and lower right positions respectively, providing pressure release in multiple directions for the ejected electrolyte.

[0037] Refer to Figure 2, in the safety valve detection circuit provided by some embodiments of the present application, the acquisition module 300 includes a voltage acquisition chip. The first acquisition port of the voltage acquisition chip is connected to the target sampling point to obtain the valve opening signal, and the second acquisition port of the acquisition chip is connected to the connection point between the valve opening detection line and the other end of the first voltage dividing resistor R1 and grounded. It should be noted that the acquisition module 300 includes a voltage acquisition chip with multiple acquisition ports. The first acquisition port GPIO1 of the chip is connected to the target sampling point T to obtain the valve opening signal, and the second acquisition port is connected to the connection point between the valve opening detection line and the other end of the first voltage dividing resistor R1 and grounded. For example, the second acquisition port can be the ground terminal of the voltage acquisition chip and is connected to the ground terminal of the circuit, ensuring that the acquisition module 300 can obtain the valve opening signal and the ground signal simultaneously, improving the accuracy and reliability of signal acquisition.

[0038] Refer to Figure 2 , in the safety valve detection circuit provided by some embodiments of the present application, the temperature sensor includes a thermistor RT, and the valve opening detection line is the ground wire of the thermistor RT. It can be understood that the temperature sensor in the above embodiment can be a thermistor RT (NTC). One end of the thermistor RT is connected to one end of the first voltage dividing resistor R1, and the other end is connected to one end of the second voltage dividing resistor R2. At the same time, the ground wire of the thermistor RT is used as the valve opening detection line. When it is impacted by the electrolyte ejection, the resistance value of the thermistor RT will change, and then the voltage output by the target sampling point T will also change accordingly, and then it is detected by the acquisition module 300 or other measuring devices, so as to realize the detection of the battery temperature and the valve opening of the battery safety valve. In one embodiment, the resistance value of the thermistor RT can be 10 kΩ, or the thermistor RT can also select other resistance values according to actual needs.

[0039] Refer to Figure 2 , in the safety valve detection circuit provided by some embodiments of the present application, the temperature detection module 100 further includes a reference voltage input terminal Vref, and the reference voltage input terminal Vref is connected to the other end of the second voltage dividing resistor R2. It should be noted that the temperature detection module 100 in the embodiments of the present application further includes a reference voltage input terminal Vref, and the reference voltage input terminal Vref is connected to the other end of the second voltage dividing resistor R2, which can provide a stable reference voltage to ensure that the measurement signal of the temperature sensor has high precision and stability.

[0040] Refer to Figure 4 As shown in Figure 4 is a flowchart of a safety valve detection method provided by an embodiment of the present application. It can be understood that this method is applied to the safety valve detection circuit as described in the above embodiment, and this method includes but is not limited to steps S101 to S104: Step S101: Obtain the first valve opening signal and record the number of acquisitions. The first valve opening signal includes a first voltage signal collected from a first target sampling point.

[0041] Step S102: Calculate a first detected resistance value based on the first voltage signal.

[0042] Step S103: If the current number of acquisitions is greater than a preset number of acquisitions, calculate a resistance change value based on the first detected resistance value and a second detected resistance value collected in the previous acquisition of the number of acquisitions.

[0043] Step S104: Perform an alarm output based on the resistance change value and a first preset resistance value.

[0044] In steps S101 to S104 of some embodiments, the processing module 400 in the safety valve detection circuit first obtains the first valve opening signal and records the number of acquisitions. The first valve opening signal includes a first voltage signal collected from a first target sampling point. Then, based on the first voltage signal, a first detected resistance value is calculated. If the current number of acquisitions exceeds the preset number of acquisitions, for example, the preset number of acquisitions is set to 1 time, it indicates that the currently obtained first valve opening signal is not the valve opening signal of the initial acquisition. Then, the resistance change value is calculated based on the first detected resistance value and the second detected resistance value collected in the previous acquisition. Finally, the processing module 400 performs an alarm output based on the resistance change value and the first preset resistance value.

[0045] According to the safety valve detection method provided by the embodiments of the present application, by obtaining the first valve opening signal and recording the number of acquisitions, where the first valve opening signal includes a first voltage signal collected from a first target sampling point, calculating a first detected resistance value based on the first voltage signal, if the current number of acquisitions is greater than the preset number of acquisitions, calculating a resistance change value based on the first detected resistance value and the second detected resistance value collected in the previous acquisition of the number of acquisitions, and performing an alarm output based on the resistance change value and the first preset resistance value, by detecting in real time the valve opening signal generated by the electrolyte in the battery safety valve spraying out and impacting the valve opening detection line, calculating the resistance change value, so as to be able to quickly and accurately detect whether the battery safety valve is opened, effectively reducing the risk of thermal runaway and improving the safety of the battery module.

[0046] In some embodiments, refer to Figure 5 as shown Figure 5 is a flowchart of a safety valve detection method provided by another embodiment of the present application. In some embodiments, the performing an alarm output based on the resistance change value and the first preset resistance value in step S104 of the above Figure 4 embodiments includes, but is not limited to, the following steps S201 to S203: Step S201: When the resistance change value is greater than the first preset resistance value, obtain a second valve opening signal, where the second valve opening signal includes a second voltage signal collected from a second target sampling point, and the second target sampling point is an adjacent sampling point of the first target sampling point.

[0047] Step S202: Calculate a second detected resistance value based on the second voltage signal.

[0048] Step S203: When the second detected resistance value is less than the second preset resistance value, output a first warning signal.

[0049] In some embodiments, the safety valve detection method provided by the embodiments of the present application further includes the following step S204: Step S204: When the resistance change value is less than or equal to the first preset resistance value, record the first detected resistance value, and calculate the battery temperature collected from the first target sampling point based on the first detected resistance value.

[0050] In some embodiments, the safety valve detection method provided by the embodiments of the present application further includes the following step S105: Step S105: If the current number of acquisitions is equal to the preset number of acquisitions, perform warning output based on the first detected resistance value, the third preset resistance value, and the fourth preset resistance value.

[0051] In some embodiments, the specific method flowchart for performing warning output based on the first detected resistance value, the third preset resistance value, and the fourth preset resistance value in step S105 of the above embodiments includes, but is not limited to, the following steps S301 to S302: Step S301: When the first detected resistance value is greater than the third preset resistance value and less than the fourth preset resistance value, output a first warning signal.

[0052] Step S302: When the first detected resistance value is greater than the fourth preset resistance value, output a second warning signal.

[0053] In some embodiments, the safety valve detection method provided by the embodiments of the present application further includes the following step S303: Step S303: When the first detected resistance value is less than the third preset resistance value, record the first detected resistance value, continue to obtain the first valve opening signal, and record the number of acquisitions.

[0054] In some embodiments, the first warning signal indicates that the battery safety valve has opened, and the second warning signal indicates that the valve opening detection line is open.

[0055] Referring Figure 6 as shown, Figure 6 is a schematic diagram of a controller 1000 provided by an embodiment of the present application.

[0056] A second aspect embodiment of the present application further provides a controller 1000, including: a memory, a processor, and a computer program stored on the memory and executable on the processor, and when the processor executes the computer program, the above-mentioned safety valve detection method is implemented.

[0057] Specifically, the controller 1000 in the embodiments of the present application includes at least one processor and a memory communicatively connected to at least one processor; the memory stores instructions executable by at least one processor, and when the instructions are executed by at least one processor, at least one processor is enabled to execute the safety valve detection method as described in the above embodiments.

[0058] The controller 1000 of this embodiment includes one or more processors 1001 and a memory 1002. Figure 6 Taking one processor 1001 and one memory 1002 as an example.

[0059] The processor 1001 and the memory 1002 can be connected by a bus or other means. Figure 6 Taking the connection by bus as an example.

[0060] The memory 1002, as a non-transitory computer-readable storage medium, can be used to store non-transitory software programs and non-transitory computer-executable programs. In addition, the memory 1002 can include high-speed random access memory, and can also include non-transitory memory, such as at least one magnetic disk storage device, a flash memory device, or other non-transitory solid-state storage devices. In some embodiments, the memory 1002 can optionally include a memory 1002 remotely arranged relative to the processor 1001, and these remote memories can be connected to the controller 1000 through a network. Examples of the above-mentioned network include but are not limited to the Internet, an enterprise intranet, a local area network, a mobile communication network, and combinations thereof.

[0061] The non-transitory software programs and instructions required to implement the safety valve detection method in the above embodiments are stored in the memory, and when executed by one or more processors, the safety valve detection method in the above embodiments and other steps of its related embodiments are executed.

[0062] In some embodiments, a fourth aspect embodiment of the present application further provides a computer-readable storage medium, and the computer-readable storage medium stores computer-executable instructions for causing a computer to execute the safety valve detection method in the above first aspect embodiment and other steps of its related embodiments.

[0063] The device embodiments or system embodiments described above are merely illustrative. The units described as separate components may or may not be physically separated, that is, they may be located in one place or distributed to multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0064] Those of ordinary skill in the art can understand that all or some of the steps and systems disclosed above can be implemented as software, firmware, hardware, and their appropriate combinations. Some physical components or all physical components can be implemented as software executed by a processor, such as a central processing unit, a digital signal processor, or a microprocessor, or implemented as hardware, or implemented as an integrated circuit, such as an application-specific integrated circuit. Such software can be distributed on a computer-readable medium, which can include a computer-readable storage medium (or non-transitory medium) and a communication medium (or transitory medium). As is well known to those of ordinary skill in the art, the term computer-readable storage medium includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information, such as computer-readable instructions, data structures, program modules, or other data. Computer-readable storage media include, but are not limited to, RAM, ROM, EEPROM, flash memory, or other memory technologies, CD-ROM, digital versatile disk (DVD), or other optical disk storage, magnetic cassette, tape, magnetic disk storage, or other magnetic storage devices, or any other medium that can be used to store the desired information and can be accessed by a computer. In addition, as is well known to those of ordinary skill in the art, a communication medium typically includes computer-readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave or other transmission mechanism, and can include any information delivery medium.

[0065] The above is a specific description of the preferred embodiment of this application, but this application is not limited to the above embodiments. Those skilled in the art can make various equivalent deformations or substitutions without departing from the spirit of this application, and these equivalent deformations or substitutions are all included in the scope defined by this application.

Claims

1. A safety valve detection circuit, characterized in that, Comprising: A temperature detection module, including a first voltage-dividing resistor, a second voltage-dividing resistor, and a temperature sensor for detecting the battery temperature. One end of the temperature sensor is connected to one end of the first voltage-dividing resistor, the other end is connected to one end of the second voltage-dividing resistor, and the other end of the first voltage-dividing resistor is grounded; An open-valve detection module, including an open-valve detection line and a shock-absorbing element provided on the battery safety valve. At least a part of the open-valve detection line is adhesively connected to the shock-absorbing element. The open-valve detection module is connected in parallel to both ends of the first voltage-dividing resistor through the open-valve detection line, and the open-valve detection module is configured to generate an open-valve signal when the electrolyte in the battery safety valve sprays out and impacts the open-valve detection line; An acquisition module, electrically connected to the temperature detection module. The acquisition module is configured to acquire the open-valve signal from a target sampling point, and the target sampling point is the connection point between the other end of the temperature sensor and one end of the second voltage-dividing resistor; A processing module, electrically connected to the acquisition module. The processing module is configured to receive the open-valve signal and process the open-valve signal to determine whether the battery safety valve has opened.

2. The safety valve detection circuit according to claim 1, characterized in that, The shock-absorbing element includes a damping sheet. The battery safety valve is provided with a plurality of leakage holes, and the damping sheet covers the plurality of leakage holes so that the open-valve detection line passes through the central positions of the plurality of leakage holes and is connected to the other end of the first voltage-dividing resistor.

3. The safety valve detection circuit according to claim 2, wherein The acquisition module includes a voltage acquisition chip. The first acquisition port of the voltage acquisition chip is connected to the target sampling point to obtain the open-valve signal, and the second acquisition port of the acquisition chip is connected to the connection point between the open-valve detection line and the other end of the first voltage-dividing resistor and is grounded.

4. The safety valve detection circuit according to any one of claims 1 to 3, characterized in that, The temperature sensor includes a thermistor, and the open-valve detection line is the ground wire of the thermistor.

5. The safety valve detection circuit according to claim 1, characterized in that The temperature detection module further includes a reference voltage input terminal, and the reference voltage input terminal is connected to the other end of the second voltage-dividing resistor.

6. A safety valve detection method, applied to the safety valve detection circuit according to any one of claims 1 to 5. The method includes: Obtaining a first open-valve signal and recording the acquisition times, wherein the first open-valve signal includes a first voltage signal acquired from a first target sampling point; Calculating a first detection resistance value according to the first voltage signal; If the current acquisition times is greater than a preset acquisition times, calculating a resistance change value according to the first detection resistance value and a second detection resistance value acquired in the previous acquisition of the acquisition times; Performing an alarm output according to the resistance change value and a first preset resistance value.

7. The method according to claim 6, characterized in that The performing an alarm output according to the resistance change value and the first preset resistance value includes: When the resistance change value is greater than the first preset resistance value, obtaining a second open-valve signal, wherein the second open-valve signal includes a second voltage signal acquired from a second target sampling point, and the second target sampling point is an adjacent sampling point of the first target sampling point; Calculating a second detection resistance value according to the second voltage signal; When the second detected resistance value is less than the second preset resistance value, a first warning signal is output.

8. The method according to claim 7, characterized in that The method further includes: When the resistance change value is less than or equal to the first preset resistance value, record the first detected resistance value, and calculate the battery temperature collected from the first target sampling point according to the first detected resistance value.

9. The method according to claim 6, wherein The method further includes: If the current number of acquisitions is equal to the preset number of acquisitions, warning output is performed according to the first detected resistance value, the third preset resistance value, and the fourth preset resistance value.

10. The method according to claim 9, characterized in that, The warning output according to the first detected resistance value, the third preset resistance value, and the fourth preset resistance value includes: When the first detected resistance value is greater than the third preset resistance value and less than the fourth preset resistance value, a first warning signal is output; When the first detected resistance value is greater than the fourth preset resistance value, a second warning signal is output.

11. The method according to claim 10, wherein The method further includes: When the first detected resistance value is less than the third preset resistance value, record the first detected resistance value, continue to obtain the first valve opening signal, and record the number of acquisitions.

12. The method according to claim 7 or 10, characterized in that, The first warning signal indicates that the battery safety valve has opened, and the second warning signal indicates that the valve opening detection line is open.

13. A controller, characterized in that, Includes: A memory, a processor, and a computer program stored on the memory and executable on the processor, where when the processor executes the computer program, the safety valve detection method described in any one of claims 6 to 12 is implemented.

14. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer-executable instructions for causing a computer to execute the safety valve detection method described in any one of claims 6 to 12.

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