CN117346946B - Air pressure sampling circuit, method, battery management system and power utilization device - Google Patents
Air pressure sampling circuit, method, battery management system and power utilization device Download PDFInfo
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
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- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
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Abstract
The application discloses an air pressure sampling circuit, an air pressure sampling method, a battery management system and an electric device, wherein the air pressure sampling circuit comprises an air pressure sensing element, and the air pressure sensing element is used for detecting air pressure in a battery pack and generating an air pressure sampling signal; the signal processing module is directly connected with the air pressure sensing element and is used for processing the air pressure sampling signal transmitted by the air pressure sensing element to obtain a target signal; the control chip is directly connected with the signal processing module and is used for receiving the target signal output by the signal processing module; the signal processing module comprises an operational amplifier. The application can effectively reduce the air pressure sampling cost.
Description
Technical Field
The present application relates to the field of battery technologies, and in particular, to a pneumatic sampling circuit, a pneumatic sampling method, a battery management system, and an electric device.
Background
With the market demand, the energy density of the power battery is continuously increased, and the demand of the market for battery safety is higher and higher. At present, in order to ensure the application safety of the battery, the information such as the ambient air pressure inside the battery pack is generally sampled to perform abnormality detection, so as to timely perform relevant safety measures and the like under dangerous situations such as battery collision, extrusion and the like, thereby avoiding serious situations. However, the present inventors have found that the battery pack air pressure sampling scheme in the related art tends to have a problem of high cost.
Disclosure of Invention
The application provides an air pressure sampling circuit, an air pressure sampling method, a battery management system and an electric device, which can effectively reduce air pressure sampling cost.
In a first aspect, the present application provides a sampling circuit comprising: the air pressure sensing element is used for detecting air pressure in the battery pack and generating an air pressure sampling signal; the signal processing module is electrically connected with the air pressure sensing element and is used for processing the air pressure sampling signal transmitted by the air pressure sensing element to obtain a target signal; the control chip is electrically connected with the signal processing module and is used for receiving the target signal output by the signal processing module.
According to the technical scheme, the environment air pressure in the battery pack is sampled through the independent air pressure sensing element, the air pressure sampling signal sampled by the air pressure sensing element is subjected to corresponding signal processing through the signal processing module, so that a target signal is obtained, the target signal is directly transmitted to the control chip in the battery management system, and the control chip can execute target operation according to the target signal after receiving the target signal. Compared with the prior art, the technical scheme provided by the embodiment of the application integrates a plurality of control chip resources related in the related art by reserving the most basic air pressure sensing element and fully utilizing the existing control chip in the battery management system, so that the resources and material consumption used in the air pressure sampling process are greatly simplified, and the cost reduction of air pressure sampling is facilitated.
According to some embodiments of the application, optionally, the signal processing module is specifically configured to: amplifying the air pressure sampling signal to obtain a first signal; and/or comparing the air pressure sampling signal with a reference signal to obtain a second signal; wherein the target signal comprises at least one of a first signal and a second signal.
In this embodiment, if the signal value of the air pressure sampling signal is smaller, the signal quantity loss may be caused in the signal transmission process, so that the accuracy of the signal received by the subsequent control chip may be affected. And/or, considering the complex function born by the control chip in the battery management system, in order to reduce further occupation of logic resources in the control chip, the embodiment obtains the second signal by comparing the air pressure sampling signal with the reference signal by the signal processing module in advance. Therefore, the control chip can directly perform corresponding processing based on the second signal after receiving the second signal, so that the processing flow of the control chip after receiving the signal is saved, and the burden of the control chip is reduced. In the whole, the signal processing schemes of the two signal processing modules provided in the embodiment can realize the related processing of the air pressure sampling signal more reasonably and efficiently.
According to some embodiments of the application, optionally, the signal processing module comprises an operational amplifier; the first input end of the operational amplifier is electrically connected with the first output end of the air pressure sensing element, the second input end of the operational amplifier is electrically connected with the second output end of the air pressure sensing element, and the output end of the operational amplifier is electrically connected with the control chip.
In this way, the operation amplifier is adopted to amplify the air pressure sampling signal, which is favorable for continuously maintaining low cost consumption under the air pressure sampling scheme, and meanwhile, the amplification processing of the air pressure sampling signal can be reasonably and accurately realized, so that the accuracy and effectiveness of the first signal finally received by the control chip can be ensured, and the misoperation triggering caused by the fact that the received signal is inaccurate by the control chip is avoided as much as possible.
According to some embodiments of the application, optionally, the target signal comprises a second signal; the signal processing module comprises a comparator; the first input end of the comparator is electrically connected with the first output end of the air pressure sensing element, and the second input end of the comparator is electrically connected with the reference node.
In this way, the present embodiment performs the comparison processing of the air pressure sampling signal and the reference signal by using the comparator, and then transmits the second signal obtained based on the comparison result to the control chip. Therefore, the control chip can directly perform quick processing based on the second signal after receiving the second signal. The embodiment can effectively save the processing flow of the control chip after receiving the signal while maintaining low cost consumption under the air pressure sampling scheme, thereby reducing the burden of the control chip in the battery management system to a certain extent.
According to some embodiments of the application, optionally, the signal processing module further comprises a voltage dividing module; the voltage dividing module is connected between the power supply and the reference node, and/or the voltage dividing module is connected between the reference node and the ground terminal.
According to some embodiments of the application, optionally, the voltage dividing module further comprises a first resistor and a second resistor; the first end of the first resistor is connected with a power supply, and the second end of the first resistor is electrically connected with a reference node; the first end of the second resistor is electrically connected with the reference node, and the second end of the second resistor is electrically connected with the grounding end. Therefore, through the voltage division effect of the first resistor and the second resistor on the voltage, the reference node can be controlled more simply and reasonably to provide a reference signal, and reasonable working and running of the air pressure sampling circuit are facilitated.
According to some embodiments of the application, optionally, the target signal comprises a first signal and a second signal; the signal processing module comprises an operational amplifier and a comparator; the first input end of the operational amplifier is electrically connected with the first output end of the air pressure sensing element, the second input end of the operational amplifier is electrically connected with the second output end of the air pressure sensing element, and the output end of the operational amplifier is electrically connected with the control chip; the first input end of the comparator is electrically connected with the first output end of the air pressure sensing element, and the second input end of the comparator is electrically connected with the reference node; the node signal at the reference node is the reference signal.
The signal processing module in this embodiment includes the aforementioned operational amplifier and comparator to process the air pressure sampling signal generated by the air pressure sensing element. Thus, the control chip can utilize the first signal and the second signal to perform mutual verification between the signals after receiving the first signal amplified by the operational amplifier and receiving the second signal obtained by comparing the comparator with the reference signal. Therefore, the accuracy and the reliability of the signals received by the control chip can be further ensured, and the situation of misoperation triggering caused by the signal accuracy problem is fully avoided.
According to some embodiments of the application, optionally, the power management module includes at least one power supply output terminal, and the power management module provides a corresponding working voltage to at least one of the air pressure sensing element, the signal processing module and the control chip through the at least one power supply output terminal.
Therefore, the power management module is used for processing the initial power supply voltage provided by the low-voltage lead acid battery, so that reasonable power supply of the air pressure sensing element, the signal processing module and the control chip in the battery management system in the air pressure sampling circuit can be more reasonably realized, and reasonable working and running of the air pressure sampling circuit can be maintained.
According to some embodiments of the application, optionally, the air pressure sampling circuit further comprises a power management module; the signal processing module is also used for transmitting the target signal to the power management module.
In this embodiment, in order to avoid the phenomenon that the control chip in the battery management system cannot receive the target signal in time and thus cannot take corresponding operations according to the target signal in time, the signal processing module sends the target signal to the control chip, and meanwhile, it is also proposed that the target signal obtained by processing the signal processing module is sent to the power management module, so as to wake up the control chip reversely. Therefore, the control chip can be awakened reversely even in the dormant state, the target signal sent by the signal processing module can be received in time, corresponding target operation processing is carried out based on the target signal, and the battery application safety is maintained.
In a second aspect, the present application provides a sampling method applied to the sampling circuit provided in the first aspect, the sampling method comprising: acquiring an air pressure sampling signal corresponding to air pressure in a battery pack; processing the air pressure sampling signal to obtain a target signal; and executing the target operation according to the target signal.
According to some embodiments of the application, optionally, performing the target operation according to the target signal comprises: and executing preset safety operation when the target signal meets the preset triggering condition.
According to some embodiments of the application, optionally, processing the air pressure sampling signal to obtain the target signal includes: amplifying the air pressure sampling signal to obtain a first signal; performing a target operation based on the target signal, comprising: according to the first signal, a target operation is performed.
According to some embodiments of the application, optionally, processing the air pressure sampling signal to obtain the target signal includes: comparing the air pressure sampling signal with a reference signal to obtain a second signal; performing a target operation based on the target signal, comprising: and performing a target operation according to the second signal.
According to some embodiments of the application, optionally, processing the air pressure sampling signal to obtain the target signal includes: amplifying the air pressure sampling signal to obtain a first signal; comparing the air pressure sampling signal with a reference signal to obtain a second signal; performing a target operation based on the target signal, comprising: determining a first air pressure condition in the battery pack based on the first signal, and judging whether the first air pressure condition is matched with a second air pressure condition represented by the second signal; and performing a preset safety operation based on at least one of the first and second air pressure conditions when the first and second air pressure conditions match and the first and second air pressure conditions satisfy a preset trigger condition.
According to some embodiments of the application, optionally, after processing the air pressure sampling signal to obtain the target signal, the air pressure sampling method further includes: acquiring chip state information of a control chip; and when the control chip is determined to be in the dormant state based on the chip state information, sending a wake-up signal to the control chip so as to wake up the control chip.
In a third aspect, the present application provides a battery management system comprising a sampling circuit as provided in the first aspect.
In a fourth aspect, the present application provides a battery system comprising a battery and a battery management system as provided by an embodiment of the third aspect of the present application.
In a fifth aspect, the present application provides an electrical consumer comprising a battery management system as provided in the third aspect.
Drawings
Features, advantages, and technical effects of exemplary embodiments of the present application will be described below with reference to the accompanying drawings.
FIG. 1 is a schematic diagram of a circuit connection of an air pressure sampling circuit according to an embodiment of the present application;
FIG. 2 is a schematic diagram of another circuit connection of the pneumatic sampling circuit according to the embodiment of the present application;
FIG. 3 is a schematic diagram of still another circuit connection of the pneumatic sampling circuit according to the embodiment of the present application;
FIG. 4 is a schematic diagram of still another circuit connection of the pneumatic sampling circuit according to the embodiment of the present application;
FIG. 5 is a schematic diagram of still another circuit connection of the pneumatic sampling circuit according to the embodiment of the present application;
FIG. 6 is a schematic diagram of still another circuit connection of the pneumatic sampling circuit according to the embodiment of the present application;
Fig. 7 is a schematic flow chart of a pneumatic sampling method according to an embodiment of the present application.
In the drawings, the drawings are not necessarily to scale.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
Embodiments of the technical scheme of the present application will be described in detail below with reference to the accompanying drawings. The following examples are only for more clearly illustrating the technical aspects of the present application, and thus are merely examples, and are not intended to limit the scope of the present application.
It should be noted that unless otherwise indicated, technical or scientific terms used in the embodiments of the present application should be given the ordinary meanings as understood by those skilled in the art to which the embodiments of the present application belong.
In the description of embodiments of the present application, the technical terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. In the description of the embodiments of the present application, the meaning of "plurality" is two or more unless explicitly defined otherwise.
In the description of the embodiments of the present application, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured" and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally formed; or may be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the embodiments of the present application will be understood by those of ordinary skill in the art according to specific circumstances.
In the description of embodiments of the application, unless expressly specified and limited otherwise, a first feature "up" or "down" on a second feature may be that the first and second features are in direct contact, or that the first and second features are in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
Before describing the technical solution provided by the embodiments of the present application, in order to facilitate understanding of the embodiments of the present application, the present application firstly specifically describes the problems existing in the related art:
the inventor notes that, in order to ensure the safety of the battery application, the information such as the ambient air pressure inside the battery pack is generally sampled to detect the air pressure, however, the battery pack air pressure sampling scheme in the related art often has the problem of higher cost.
The inventor researches and discovers that the related technology is often to sample the environment by using an on-board sampling chip when the air pressure in the battery pack is sampled. The sampling chip is internally integrated with a barometric sensing element (such as a piezoresistor), a sampling circuit and a micro control unit (Microcontroller Unit, MCU). The sampling chip is often high in cost, so that the cost for realizing air pressure sampling is high.
In order to solve the technical problems, the application provides an air pressure sampling circuit, an air pressure sampling method, a battery management system and an electric device, which can solve the problem of high air pressure sampling cost in the related art. It should be noted that the examples provided by the present application are not intended to limit the scope of the present disclosure.
The technical conception of the application is as follows: in the specific sampling process of the related art, the air pressure sensing element inside the sampling chip transmits the air pressure signal to the MCU inside the sampling chip after sampling the air pressure signal. After receiving the air pressure signal, the MCU in the sampling chip processes the air pressure signal, then converts the processed signal into a signal format supporting communication, for example, converts the processed signal into a signal in an SPI (serial peripheral interface ((SERIAL PERIPHERAL INTERFACE)), and finally sends the signal (usually a digital signal) after format conversion to the MCU in the BMS (Battery MANAGEMENT SYSTEM) to enable the MCU in the BMS to execute corresponding operation processing according to the signal sent by the MCU in the received sampling chip.
The inventor of the present application has realized that there is actually a use of a plurality of MCU resources in the above-described air pressure sampling scheme implemented based on the sampling chip, and thus it is considered to integrate the MCU resources to achieve air pressure sampling cost reduction. In particular, the application proposes that only a single air pressure sensing element (with lower cost) can be reserved for sampling the air pressure in the battery pack, and an air pressure sampling signal can be directly sent to an MCU in the BMS for processing after being processed by a certain signal. Thus, the problem of high cost caused by sampling by using the sampling chip is effectively avoided.
In addition, after the sampling chip is replaced by an independent air pressure sensing element, signal transmission among a plurality of MCUs is not involved in the air pressure sampling and signal transmission processes, and communication protocol format conversion of signals by the MCU in the sampling chip is not needed. Therefore, the scheme provided by the application can reduce the cost of the air pressure sampling materials, simplify the internal processing and transmission flow of the sampling signals, and is beneficial to improving the processing and transmission efficiency of the sampling signals.
The air pressure sampling circuit provided by the embodiment of the application is first described below.
Fig. 1 is a schematic circuit connection diagram of an air pressure sampling circuit according to an embodiment of the present application. As shown in fig. 1, the air pressure sampling circuit provided by the present application specifically includes: the air pressure sensing element 101, the signal processing module 102 and the control chip 103. The specific application environment of the air pressure sampling circuit can be on a battery management system BMS board.
Specifically, the air pressure sensor 101 may be configured to detect air pressure in the battery pack and generate an air pressure sampling signal. The air pressure sensor may be, for example, a varistor, and the air pressure sampling signal may be, for example, an analog signal such as a voltage signal or a current signal.
For example, when the air pressure in the battery pack changes, the resistance value of the piezoresistor in the air pressure sensing element changes, so that the loop voltage of the piezoresistor changes, and the voltage at two ends of the piezoresistor can be used as an air pressure sampling signal.
However, the air pressure sensor and the air pressure sampling signal in the present application are not limited to the above embodiments.
The signal processing module 102 is electrically connected to the air pressure sensor 101, and can be used for processing the air pressure sampling signal transmitted by the air pressure sensor 101 to obtain a target signal.
In the present application, the signal processing module 102 is used to process the air pressure sampling signal generated by the air pressure sensing element 101, for example, signal amplification processing or processing from analog quantity to digital quantity, so as to reduce data errors, thereby helping to improve the reliability of the execution action of the subsequent target operation.
The control chip 103 may be electrically connected to an output terminal of the signal processing module 102, and may be configured to receive the target signal transmitted by the signal processing module 102, and perform the target operation according to the target signal.
The control chip 103 is disposed in the battery management system BMS. A kind of electronic device with a high-pressure air-conditioning system. The control chip 103 may be an MCU, etc., which is not limited in this embodiment.
The target signal may specifically include an electric signal or the like, and is not particularly limited herein. The above-mentioned performing of the target operation according to the target signal may specifically be, for example: under the condition that the target signal indicates that the air pressure in the battery pack is normal, the control chip does not act; under the condition that the target signal meets the preset triggering condition, the abnormal air pressure in the battery pack is indicated, and the preset safety operation is executed under the condition, such as controlling the power-off of a battery loop, controlling the corresponding alarm function module to carry out alarm prompt and the like, and the application is not exemplified herein one by one.
In the technical scheme of the embodiment of the application, the environmental air pressure in the battery pack is sampled through the independent air pressure sensing element 101, then the air pressure sampling signal sampled by the air pressure sensing element 101 is subjected to corresponding signal processing by the signal processing module 102 so as to obtain a target signal, and then the target signal is directly transmitted to the control chip 103 in the battery management system BMS, and the control chip 103 can execute target operation according to the target signal after receiving the target signal. Compared with the prior art, the technical scheme provided by the embodiment of the application realizes the integration of a plurality of control chip resources related in the related art by reserving the most basic air pressure sensing element 101 and fully utilizing the existing control chip 103 in the battery management system, thereby greatly simplifying the resources and the material consumption used in the air pressure sampling process and being beneficial to realizing the cost reduction of air pressure sampling.
In addition, the air pressure sampling circuit 10 provided by the embodiment of the application has the following advantages: as described above, after the sampling chip is replaced by an independent air pressure sensing element, the application does not need to involve signal transmission among a plurality of MCUs in the air pressure sampling and signal transmission processes, and the MCUs in the sampling chip do not need to perform communication protocol format conversion on signals. Therefore, the pneumatic sampling circuit 10 provided by the embodiment of the application simplifies the internal processing and transmission flow of the sampling signal while realizing the cost reduction of pneumatic sampling materials, and is beneficial to further improving the processing and transmission efficiency of the sampling signal.
According to some embodiments of the present application, the signal processing module 102 may be specifically configured to: amplifying the air pressure sampling signal to obtain a first signal; and/or comparing the air pressure sampling signal with a reference signal to obtain a second signal; wherein the target signal may comprise at least one of a first signal and a second signal; the control chip 103 may be specifically configured to perform a preset security operation when the target signal meets a preset trigger condition.
In this embodiment, considering that the signal value of the air pressure sampling signal is smaller, the signal quantity may be lost in the signal transmission process, so that the accuracy of the signal received by the subsequent control chip 103 may be affected, based on this, the signal processing module 102 amplifies the air pressure sampling signal to obtain the first signal, which is beneficial to improving the accuracy of the signal received by the control chip 103.
And/or, considering the complexity of the functions carried by the control chip 103 in the battery management system, in order to reduce further occupation of logic resources in the control chip 103, the present embodiment obtains the second signal by comparing the air pressure sampling signal with the reference signal by the signal processing module 102 in advance. In this way, the control chip 103 can directly perform corresponding processing based on the second signal after receiving the second signal, so that a processing flow of the control chip 103 after receiving the signal is saved, which is beneficial to reducing the burden of the control chip 103.
In summary, the signal processing schemes of the two signal processing modules 102 provided in this embodiment can more reasonably and efficiently implement the related processing of the air pressure sampling signal.
Fig. 2 is a schematic diagram of another circuit connection of the air pressure sampling circuit according to an embodiment of the present application. As shown in fig. 2, the signal processing module 102 may optionally include an operational amplifier P1, according to some embodiments of the application.
In the circuit shown in fig. 2, a first input terminal of the operational amplifier P1 is electrically connected to a first output terminal of the air pressure sensor 101, a second input terminal of the operational amplifier P1 is electrically connected to a second output terminal of the air pressure sensor 101, and an output terminal of the operational amplifier P1 is electrically connected to the control chip 103.
In specific operation, the operational amplifier P1 may be configured to receive the air pressure sampling signal transmitted by the air pressure sensing element 101; and amplifying the air pressure sampling signal to obtain a first signal, and transmitting the first signal to the control chip 103.
Here, the air pressure sampling signal generated by the air pressure sensor 101 is usually an analog signal (voltage signal), and the first signal amplified by the operational amplifier P1 is still an analog signal.
In this case, after receiving the first signal, the control chip 103 may perform analog-to-digital conversion on the first signal to obtain a corresponding air pressure parameter value, and then compare the air pressure parameter value with an air pressure value in a normal air pressure range. If the air pressure parameter value exceeds the normal range, it indicates that the target signal satisfies a predetermined trigger condition, in which case the control chip 103 may perform a corresponding predetermined safety operation.
Or after receiving the first signal (voltage signal), the control chip 103 may directly compare the first signal with a voltage signal within a normal air pressure range, if the first signal exceeds the normal air pressure range, it indicates that the target signal meets a preset trigger condition, and the control chip 103 may perform a corresponding preset safety operation.
In this way, the operation amplifier P1 is adopted to amplify the air pressure sampling signal, which is favorable for continuously maintaining low cost consumption under the air pressure sampling scheme, and meanwhile, the amplification processing of the air pressure sampling signal can be reasonably and accurately realized, so that the accuracy and effectiveness of the first signal finally received by the control chip 103 can be ensured, and the triggering misoperation of the control chip 103 caused by inaccurate received signal can be avoided as far as possible.
Referring to fig. 3, fig. 3 is a schematic circuit connection diagram of an air pressure sampling circuit according to an embodiment of the application. As shown in fig. 3, the signal processing module 102 may optionally include a comparator P2 according to some embodiments of the present application.
As can be seen from the structure shown in fig. 3, the first input end of the comparator P2 is electrically connected to the first output end of the air pressure sensor 101, and the second input end of the comparator P2 is electrically connected to the reference node U1.
In particular operation, the comparator P2 may be used to: receiving an air pressure sampling signal transmitted by the air pressure sensing element 101; and comparing the air pressure sampling signal with a reference signal provided at the reference node U1 to obtain a second signal, and transmitting the second signal and the second signal to the control chip 103.
In this embodiment, the second signal may be a digital signal. The air pressure sampling signal and the reference signal may be analog signals.
Illustratively, the comparator P2 outputs the digital signal 1 if the air pressure sampling signal generated by the air pressure sensing element 101 is greater than the reference signal. Conversely, if the air pressure sampling signal generated by the air pressure sensor 101 is smaller than the reference signal, the comparator P2 outputs a digital signal 0.
Further, if the signal value of the second signal received by the control chip 103 is 1, it may be determined that the target signal meets the preset trigger condition, and in this case, the control chip 103 may perform the corresponding preset security operation.
In this way, the present embodiment performs the comparison processing of the air pressure sampling signal and the reference signal by using the comparator P2, and then transmits the second signal obtained based on the comparison result to the control chip 103. In this way, the control chip 103 can perform fast processing directly based on the second signal after receiving the second signal. The present embodiment can effectively save the processing flow of the control chip 103 after receiving the signal while maintaining low cost consumption under the air pressure sampling scheme, thereby reducing the burden of the control chip 103 in the battery management system to a certain extent.
Continuing to refer to fig. 3, according to some embodiments of the present application, optionally, the signal processing module 102 further includes a voltage dividing module; the voltage dividing module is connected between the power source VCC and the reference node U1, and/or the voltage dividing module is connected between the reference node U1 and the ground GND.
The voltage dividing module may specifically include a first resistor R1 and a second resistor R2.
In particular, as shown in fig. 3, a first end of the first resistor R1 is connected to the power VCC, and a second end of the first resistor R1 is electrically connected to the reference node U1.
The first end of the second resistor R2 is electrically connected to the reference node U1, and the second end of the second resistor R2 is electrically connected to the ground GND.
In this embodiment, by setting the ratio of the resistances of the first resistor R1 and the second resistor R2, the reference node U1 can present the required reference signal. For example, if the voltage of the power VCC connected to the first end of the first resistor R1 is 5V, the resistance of the first resistor R1 is 2 ohms, and the resistance of the second resistor R2 is 3 ohms, the node voltage presented at the reference node U1, that is, the reference signal is 3V.
In this way, through the voltage division effect of the first resistor R1 and the second resistor R2 on the voltage, the reference node U1 can be more simply and reasonably controlled to provide a reference signal, which is beneficial to the reasonable working operation of the air pressure sampling circuit 10.
Referring to fig. 4, fig. 4 is a schematic circuit connection diagram of an air pressure sampling circuit according to an embodiment of the application. As shown in fig. 4, the target signal may optionally include a first signal and a second signal according to some embodiments of the present application. The signal processing module 102 may include an operational amplifier P1 and a comparator P2.
In the circuit structure shown in fig. 4, the first input terminal of the operational amplifier P1 is electrically connected to the first output terminal of the air pressure sensor 101, the second input terminal of the operational amplifier P1 is electrically connected to the second output terminal of the air pressure sensor 101, and the output terminal of the operational amplifier P1 is electrically connected to the control chip 103.
A first input terminal of the comparator P2 is electrically connected to a first output terminal of the air pressure sensor 101, and a second input terminal of the comparator P2 is electrically connected to the reference node U1. The node signal at reference node U1 is the reference signal.
In operation of the specific circuit, the control chip 103 may be used to: receiving a first signal transmitted by the operational amplifier P1 and a second signal transmitted by the comparator P2; a first air pressure condition within the battery pack is determined based on the first signal, and a determination is made as to whether the first air pressure condition matches a second air pressure condition characterized by the second signal. And performing a preset safety operation based on at least one of the first and second air pressure conditions when the first and second air pressure conditions match and the first and second air pressure conditions satisfy a preset trigger condition.
For example, after receiving the first signal transmitted by the operational amplifier P1 and the second signal transmitted by the comparator P2, the control chip 103 may perform mutual verification according to the first signal and the second signal. For example, if the first air pressure condition in the battery pack indicated by the first signal is an abnormal air pressure condition, it may be further determined whether the second air pressure condition indicated by the second signal is also an abnormal air pressure condition.
If the first air pressure condition and the second air pressure condition are abnormal air pressure conditions, it may be indicated that the first air pressure condition and the second air pressure condition match and both satisfy the preset trigger condition, in which case the control chip 103 may perform the preset safety operation based on at least one of the first air pressure condition and the second air pressure condition.
If the first air pressure condition and the second air pressure condition are both normal air pressure conditions, it may be indicated that the first air pressure condition and the second air pressure condition are matched but do not satisfy the preset trigger condition, and in this case, the control chip 103 may not operate.
It is to be added that in some possible embodiments, the air pressure conditions may also be specifically classified into different air pressure risk levels, at which the operations to be performed by the control chip 103 are different. In this way, the preset safety operation is performed based on at least one of the first air pressure condition and the second air pressure condition, and the preset safety operation to be performed may be determined according to the air pressure risk level of at least one of the first air pressure condition and the second air pressure condition.
Further, in order to fully ensure the safety of the battery application, the preset safety operation may be performed by selecting a higher air pressure risk level of the first air pressure condition and the second air pressure condition, which is not strictly limited in the embodiment.
In this embodiment, the signal processing module 102 includes the aforementioned operational amplifier P1 and the comparator P2 to process the air pressure sampling signal generated by the air pressure sensor 101. In this way, the control chip 103 can perform mutual verification between signals by using the first signal and the second signal after receiving the first signal amplified by the operational amplifier P1 and receiving the second signal compared with the reference signal by the comparator P2. In this way, the accuracy and reliability of the signal received by the control chip 103 can be further ensured, so that the occurrence of the situation of triggering misoperation due to the signal accuracy problem is fully avoided.
Referring to fig. 5, fig. 5 is a schematic diagram illustrating another circuit connection of the pneumatic sampling circuit according to an embodiment of the application. As shown in fig. 5, the pneumatic sampling circuit 10 may optionally further include a power management module 104, according to some embodiments of the present application.
In the circuit structure shown in fig. 5, the power management module 104 includes at least one power supply output end, and the power management module 104 provides a corresponding operating voltage to at least one of the air pressure sensing element 101, the signal processing module 102 and the control chip 103 through the at least one power supply output end.
In particular operation, the first power input of the power management module 104 is illustratively electrically coupled to the positive pole of the low voltage lead acid battery 20, and the second power input of the power management module 104 is electrically coupled to the negative pole of the low voltage lead acid battery 20. The power management module 104 may be configured to provide the corresponding working voltage to at least one of the air pressure sensing element 101, the signal processing module 102, and the control chip 103 through at least one power supply output terminal after performing the conversion processing on the initial power supply voltage provided by the low-voltage lead acid battery 20.
For example, the initial power supply voltage of the low-voltage lead acid battery 20 is 12V, the operating voltages required by the air pressure sensor 101 and the signal processing module 102 (here, the operational amplifier P1 is exemplified) are 3.3V, and the operating voltage required by the control chip 103 is 5V.
In this case, the power management module 104 may perform different levels of step-down processing on the 12V voltage provided by the low-voltage lead acid battery 20, so that the 3.3V or 5V voltage obtained by the step-down processing is finally output to the corresponding load (at least one of the air pressure sensing element 101, the signal processing module 102 and the control chip 103) through different power supply output terminals, so as to maintain the normal operation of the load.
Specifically, in the step-down process, a plurality of step-down circuits (BUCK circuits) and the like may be integrated in the power management module 104. In some cases, the power management module 104 may further include a boost circuit, etc. to implement voltage conversion with different requirements.
In this way, the power management module 104 processes the initial power voltage provided by the low-voltage lead acid battery 20, so that reasonable power supply to the air pressure sensing element 101, the signal processing module 102 and the control chip 103 in the battery management system in the air pressure sampling circuit 10 can be more reasonably realized, thereby being beneficial to maintaining reasonable working and running of the air pressure sampling circuit 10.
Referring to fig. 6, fig. 6 is a schematic diagram illustrating still another circuit connection of the pneumatic sampling circuit according to an embodiment of the present application. As shown in fig. 6, the pneumatic sampling circuit 10 may optionally further include a power management module 104, according to some embodiments of the present application. The signal processing module 102 may also be used to transmit the target signal to the power management module 104.
In particular operation, the power management module 104 may be further specifically configured to: and receiving the target signal, and waking up the control chip 103 when detecting that the control chip 103 is in the sleep state, so that the control chip 103 after being woken up executes target operation according to the target signal.
In this embodiment, in order to avoid the phenomenon that the control chip 103 in the battery management system cannot receive the target signal in time and thus cannot take corresponding operations according to the target signal in time, the signal processing module 102 sends the target signal to the control chip 103, and meanwhile, it is also proposed that the target signal obtained by processing the signal processing module 102 is sent to the power management module 104, so as to perform reverse wake-up of the control chip 103.
In this way, it is beneficial to ensure that the control chip 103 can be awakened reversely even in the sleep state, so that the target signal sent by the signal processing module 102 can be received in time, and corresponding target operation processing is performed based on the target signal, thereby being beneficial to maintaining the safety of battery application.
It should be noted that, when the power management module 104 performs the reverse wake-up to the control chip 103, it may be that the power management module 104 is in a sleep state to the control chip 103 after receiving the target signal, and if it is determined that the control chip 103 is in sleep, a corresponding wake-up signal may be sent to end the sleep of the control chip 103. The wake-up signal may be an electrical signal, etc., and is not limited herein.
Optionally, to further ensure the reliability and rationality of the execution of the preset safe operation actions, the control chip 103 may be specifically configured to: acquiring at least one of voltage parameter information and temperature parameter information of the battery pack under the condition that the target signal meets a preset trigger condition; and executing a preset safety operation under the condition that at least one of the voltage parameter information and the temperature parameter information meets a preset trigger condition.
It should be understood that, for example, the voltage parameter information and the temperature parameter information referred to herein may be acquired by corresponding voltage sensors, temperature sensors, etc. disposed in the battery pack and transmitted to the control chip 103. The specific ways of obtaining the voltage parameter information and the temperature parameter information are not particularly limited herein.
In particular, when the target signal meets the preset trigger condition, the above voltage parameter information and the temperature parameter information may be further combined to further determine, and if it is determined that at least one of the voltage parameter information and the temperature parameter information also meets the preset trigger condition, the control chip 103 performs a corresponding preset safety operation.
In this embodiment, by acquiring at least one of the voltage parameter signal and the temperature parameter information of the battery pack, the control chip 103 is enabled to further verify the determination result of the target signal, which is beneficial to avoiding unnecessary execution of the preset safety operation, thereby further guaranteeing the reliability and rationality of execution of the preset safety operation action.
Optionally, in view of the actual battery application scenario, the control chip 103 may be specifically configured to: outputting a first control signal under the condition that the target signal meets a preset trigger condition, wherein the first control signal can be used for controlling the disconnection of a target loop where the battery pack is located;
and/or outputting a second control signal, wherein the second control signal can be used for controlling the alarm module to output alarm prompt information.
It should be understood that the alarm module may be, for example, a voice alarm function module in a vehicle or the like, and may be specifically set as the case may be. The alarm prompting signal may be, for example, a whistle, a voice prompting message, or an alarm text message, which are not illustrated herein.
The first control signal and the second control signal may be electrical signals, which is not particularly limited in this embodiment.
In this way, the embodiment combines with the actual battery scenario to specifically set the preset safety operation to be executed when the target signal meets the preset trigger condition, so that the battery application safety can be more reasonably ensured.
Based on the air pressure sampling circuit 10 provided in the above embodiment, the application also provides an air pressure sampling method. The air pressure sampling method provided by the embodiment of the present application can be applied to the air pressure sampling circuit 10 provided by the above embodiment.
Fig. 7 is a schematic flow chart of a sampling method according to an embodiment of the present application. As shown in fig. 7, the sampling method provided by the embodiment of the present application may include the following steps:
s701, acquiring an air pressure sampling signal corresponding to air pressure in a battery pack;
S702, processing the air pressure sampling signal to obtain a target signal;
s703, performing a target operation according to the target signal.
The air pressure sampling method provided by the embodiment of the application is applied to the air pressure sampling circuit provided by the embodiment, the air pressure sampling signal corresponding to the air pressure in the battery pack is obtained, the air pressure sampling signal is processed to obtain the target signal, and finally, the target operation is executed according to the target signal, compared with the prior art, the air pressure sampling method can greatly simplify the resource and material consumption used in the air pressure sampling process, and is beneficial to realizing the cost reduction of air pressure sampling. In addition, according to the air pressure sampling method, the air pressure sampling material cost is reduced, meanwhile, the internal processing and transmission flow of the sampling signals are simplified, and the processing and transmission efficiency of the sampling signals are improved.
It should be understood that the specific implementation procedures of S701 to S703 have been described in detail above, and are not described here again.
According to some embodiments of the application, optionally, performing the target operation according to the target signal comprises: and executing preset safety operation when the target signal meets the preset triggering condition.
For example, the preset trigger condition may be, for example, a value of the target signal is smaller than a certain signal threshold, which is not limited by the present application. The preset safety operation can be, for example, an alarm prompt for the battery state, and the like, and can be specifically determined according to the actual requirement.
According to some embodiments of the application, optionally, processing the air pressure sampling signal to obtain the target signal includes: amplifying the air pressure sampling signal to obtain a first signal; performing a target operation based on the target signal, comprising: according to the first signal, a target operation is performed.
In this embodiment, if the signal value of the air pressure sampling signal is smaller, the signal quantity loss may be caused in the signal transmission process, so that the data accuracy of the subsequent signal may be affected, and based on this, the first signal is obtained by amplifying the air pressure sampling signal, which is favorable to improving the signal data accuracy, so that the reliability of the target operation action is favorable to be fully ensured.
According to some embodiments of the application, optionally, processing the air pressure sampling signal to obtain the target signal includes: comparing the air pressure sampling signal with a reference signal to obtain a second signal; performing a target operation based on the target signal, comprising: and performing a target operation according to the second signal.
In this embodiment, in view of the complexity of the functions carried by the relevant control chip in the battery management system, in order to reduce further occupation of the logic resources of the control chip, the present embodiment compares the air pressure sampling signal with the reference signal in advance to obtain the second signal.
Therefore, the control chip can directly perform corresponding processing based on the second signal after receiving the second signal, so that the processing flow of the control chip after receiving the signal is saved, the burden of the control chip is reduced, and the rapid action of the target operation is guaranteed.
According to some embodiments of the present application, optionally, the processing the air pressure sampling signal to obtain the target signal includes: amplifying the air pressure sampling signal to obtain a first signal; comparing the air pressure sampling signal with a reference signal to obtain a second signal; performing a target operation based on the target signal, comprising: determining a first air pressure condition in the battery pack based on the first signal, and judging whether the first air pressure condition is matched with a second air pressure condition represented by the second signal; and performing a preset safety operation based on at least one of the first and second air pressure conditions when the first and second air pressure conditions match and the first and second air pressure conditions satisfy a preset trigger condition.
In this embodiment, an air pressure sampling signal is amplified to obtain a first signal; and comparing the air pressure sampling signal with the reference signal to obtain a second signal. Thus, after the first signal and the second signal are obtained, mutual verification can be performed according to the first signal and the second signal. For example, if the first air pressure condition in the battery pack indicated by the first signal is an abnormal air pressure condition, it may be further determined whether the second air pressure condition indicated by the second signal is also an abnormal air pressure condition.
If the first air pressure condition and the second air pressure condition are abnormal air pressure conditions, it can be stated that the first air pressure condition and the second air pressure condition are matched and both meet the preset triggering condition, and in this case, the preset safety operation can be performed based on at least one of the first air pressure condition and the second air pressure condition.
If the first air pressure condition and the second air pressure condition are both normal air pressure conditions, it can be stated that the first air pressure condition and the second air pressure condition are matched but do not meet the preset trigger condition, and the operation is not possible under the condition.
It is to be added that in some possible embodiments, the air pressure conditions may also be specifically divided into different air pressure risk levels, at which the operations to be performed are different. In this way, the preset safety operation is performed based on at least one of the first air pressure condition and the second air pressure condition, and the preset safety operation to be performed may be determined according to the air pressure risk level of at least one of the first air pressure condition and the second air pressure condition. Further, in order to fully ensure the safety of the battery application, the preset safety operation may be performed by selecting a higher air pressure risk level of the first air pressure condition and the second air pressure condition, which is not strictly limited in the embodiment.
According to some embodiments of the application, optionally, after processing the air pressure sampling signal to obtain the target signal, the air pressure sampling method further includes: acquiring chip state information of a control chip; and when the control chip is determined to be in the dormant state based on the chip state information, sending a wake-up signal to the control chip so as to wake up the control chip. In this way, the control chip can be woken up reversely even in the dormant state, so that the safety of battery application is maintained.
It should be understood that the specific implementation procedure of the foregoing embodiment has been described in detail above, and will not be repeated here.
Based on the air pressure sampling circuit provided by the embodiment, the application also provides a Battery management system (Battery MANAGEMENT SYSTEM, BMS). The battery management system provided by the embodiment of the application can comprise the air pressure sampling circuit provided by the embodiment.
The battery management system provided by the embodiment of the application has the beneficial effects of the air pressure sampling circuit provided by the embodiment of the application, and the specific description of the air pressure sampling circuit in the above embodiments can be referred to specifically, and the embodiment is not repeated here.
Based on the battery management system provided by the embodiment, the application also provides a battery system, which comprises a battery and the battery management system provided by the embodiment. The battery system provided by the embodiment of the present application has the beneficial effects of the battery management system provided by the embodiment of the present application, and specific description of the battery management system and the corresponding air pressure sampling circuit in the above embodiments may be referred to specifically, and this embodiment is not repeated here.
Based on the air pressure sampling circuit or the battery management system provided by the embodiment, the application also provides an electric device, and the electric device comprises the air pressure sampling circuit or the battery management system provided by the embodiment. In some specific embodiments, the powered device may alternatively be a vehicle. The vehicle can be a fuel oil vehicle, a fuel gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle or a range-extended vehicle and the like.
While the application has been described with reference to a preferred embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the application, and in particular, the technical features set forth in the various embodiments may be combined in any manner so long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions falling within the scope of the claims.
Claims (18)
1. An air pressure sampling circuit, comprising:
The air pressure sensing element is used for detecting air pressure in the battery pack and generating an air pressure sampling signal;
The signal processing module is directly connected with the air pressure sensing element and is used for processing the air pressure sampling signal transmitted by the air pressure sensing element to obtain a target signal;
the control chip is directly connected with the signal processing module and is used for receiving the target signal output by the signal processing module, and the target signal is used for judging the air pressure condition in the battery pack;
the signal processing module comprises an operational amplifier and a comparator, and the target signal comprises a first signal and a second signal;
the first signal is an analog signal processed by the operational amplifier, and the second signal is a digital signal processed by the comparator.
2. The pneumatic sampling circuit of claim 1, wherein the signal processing module is specifically configured to:
amplifying the air pressure sampling signal to obtain a first signal;
And comparing the air pressure sampling signal with a reference signal to obtain a second signal.
3. The pneumatic sampling circuit according to claim 1 or 2, wherein,
The first input end of the operational amplifier is electrically connected with the first output end of the air pressure sensing element, the second input end of the operational amplifier is electrically connected with the second output end of the air pressure sensing element, and the output end of the operational amplifier is electrically connected with the control chip.
4. The pneumatic sampling circuit according to claim 1 or 2, wherein,
The first input end of the comparator is electrically connected with the first output end of the air pressure sensing element, and the second input end of the comparator is electrically connected with the reference node.
5. The pneumatic sampling circuit of claim 4, wherein the signal processing module further comprises a voltage dividing module;
The voltage dividing module is connected between a power supply and the reference node, and/or connected between the reference node and a ground terminal.
6. The pneumatic sampling circuit of claim 5, wherein the voltage divider module comprises a first resistor and a second resistor;
The first end of the first resistor is connected with a power supply, and the second end of the first resistor is electrically connected with the reference node;
the first end of the second resistor is electrically connected with the reference node, and the second end of the second resistor is electrically connected with the grounding end.
7. The barometric pressure sampling circuit of claim 1 or 2, wherein said target signal comprises a first signal and a second signal; the signal processing module comprises the operational amplifier and the comparator;
The first input end of the operational amplifier is electrically connected with the first output end of the air pressure sensing element, the second input end of the operational amplifier is electrically connected with the second output end of the air pressure sensing element, and the output end of the operational amplifier is electrically connected with the control chip;
The first input end of the comparator is electrically connected with the first output end of the air pressure sensing element, and the second input end of the comparator is electrically connected with the reference node; the node signal at the reference node is a reference signal.
8. The air pressure sampling circuit according to claim 1 or 2, further comprising a power management module;
The power management module comprises at least one power supply output end, and the power management module respectively provides corresponding working voltage for at least one of the air pressure sensing element, the signal processing module and the control chip through the at least one power supply output end.
9. The air pressure sampling circuit according to claim 1 or 2, further comprising a power management module; the signal processing module is also used for transmitting the target signal to the power management module.
10. A method of barometric pressure sampling, the method comprising:
acquiring an air pressure sampling signal corresponding to air pressure in a battery pack;
Amplifying and comparing the air pressure sampling signals to obtain target signals comprising a first signal and a second signal;
Executing target operation according to the target signal;
The target signal is used for judging the air pressure condition in the battery pack; the first signal is an analog signal subjected to amplification processing, and the second signal is a digital signal subjected to comparison processing.
11. The method of air pressure sampling according to claim 10, wherein said performing a target operation based on said target signal comprises:
And executing preset safety operation when the target signal meets a preset trigger condition.
12. The air pressure sampling method according to claim 10 or 11, wherein the amplifying and comparing the air pressure sampling signal to obtain a target signal comprises:
amplifying the air pressure sampling signal to obtain a first signal;
the executing the target operation according to the target signal includes:
And executing the target operation according to the first signal.
13. The air pressure sampling method according to claim 10 or 11, wherein the amplifying and comparing the air pressure sampling signal to obtain a target signal comprises:
comparing the air pressure sampling signal with a reference signal to obtain a second signal;
the executing the target operation according to the target signal includes:
and executing the target operation according to the second signal.
14. The air pressure sampling method according to claim 10 or 11, wherein the amplifying and comparing the air pressure sampling signal to obtain a target signal comprises:
Amplifying the air pressure sampling signal to obtain a first signal; and comparing the air pressure sampling signal with a reference signal to obtain a second signal;
the executing the target operation according to the target signal includes:
Determining a first air pressure condition in the battery pack based on the first signal, and judging whether the first air pressure condition is matched with a second air pressure condition represented by the second signal; and
And when the first air pressure condition and the second air pressure condition are matched and the first air pressure condition and the second air pressure condition meet a preset trigger condition, performing a preset safety operation based on at least one of the first air pressure condition and the second air pressure condition.
15. The air pressure sampling method according to claim 10 or 11, wherein after the air pressure sampling signal is subjected to amplification processing and comparison processing to obtain a target signal, the method further comprises:
Acquiring chip state information of a control chip;
And when the control chip is determined to be in the dormant state based on the chip state information, sending a wake-up signal to the control chip so as to wake up the control chip.
16. A battery management system comprising the pneumatic sampling circuit of any one of claims 1-9.
17. A battery system comprising a battery and the battery management system of claim 16.
18. An electrical apparatus comprising a pneumatic sampling circuit as claimed in any one of claims 1 to 9.
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