Method, device, equipment and system for detecting air pressure of battery

Abstract

The invention discloses an air pressure detection method, device, equipment and system for a battery. The air pressure detection method for the battery comprises the following steps: respectively inputting excitation signals with different frequencies into piezoelectric devices arranged on the battery; acquiring the impedance of the piezoelectric device under the excitation signals with different frequencies; and determining a target impedance from the impedances corresponding to the excitation signals with different frequencies, and determining an air pressure value matched with the target impedance in the battery. According to the scheme, the air pressure in the battery can be measured.

Description

Technical Field

[0001] The present application relates to the field of batteries, and in particular to a method, device, equipment and system for detecting air pressure of a battery. Background Art

[0002] During the battery formation and circulation process, a series of chemical reactions may produce gas, which may cause high gas pressure inside the battery, thus affecting the battery performance and safety.

[0003] However, there are very few methods and equipment for testing the battery's air pressure. The common drainage method and paraffin drainage method for testing the battery's air pressure are cumbersome and dangerous. The drainage method requires piercing the explosion-proof valve to discharge the gas inside the battery, and then collecting it in a container through the drainage method to achieve the purpose of measuring the internal air pressure of the battery. This method damages the integrity of the battery structure. If the external humidity is high, water can easily cause the negative electrode lithium ions to be rapidly reduced, which can easily cause fires and other safety accidents. When measuring with the paraffin drainage method, paraffin will enter the battery, causing pollution to the internal structure of the battery and rendering the battery scrapped. Summary of the invention

[0004] The present application at least provides a battery air pressure detection method, device, equipment and system.

[0005] The present application provides a method for detecting air pressure of a battery, comprising: inputting excitation signals of different frequencies to a piezoelectric device arranged on the battery respectively; obtaining the impedance of the piezoelectric device under the excitation signals of different frequencies; determining a target impedance from the impedances corresponding to the excitation signals of different frequencies, and determining an air pressure value in the battery that matches the target impedance.

[0006] In the above scheme, an excitation signal is input to the piezoelectric device arranged on the battery. The piezoelectric device causes the battery to vibrate after receiving the excitation signal. Since the air pressure in the battery is different, the vibration form of the battery may be different, and the vibration of the battery affects the impedance of the piezoelectric device through the positive piezoelectric effect. Therefore, the air pressure value in the battery can be determined based on the impedance of the piezoelectric device under excitation signals of different frequencies. Compared with the drainage method, this scheme does not need to destroy the structure of the battery, nor does it need to pull out the relevant pipelines to detect the air pressure in the battery.

[0007] In some embodiments, determining the air pressure value in the battery that matches the target impedance includes: taking the frequency corresponding to the target impedance as the target frequency; determining the air pressure value that matches the target frequency in a preset corresponding relationship, wherein the preset corresponding relationship represents the corresponding relationship between the frequency and the air pressure value.

[0008] In the above scheme, by establishing a corresponding relationship between frequency and air pressure value, and then determining the target impedance from various impedances, it is possible to determine the air pressure in the battery according to the frequency corresponding to the target impedance.

[0009] In some embodiments, determining the target impedance from the impedances corresponding to the excitation signals of different frequencies includes: selecting at least one impedance that meets the conditions required by the preset corresponding relationship from the impedances corresponding to the excitation signals of different frequencies as the target impedance.

[0010] In the above scheme, the preset corresponding relationship can be established according to the frequency corresponding to a specific impedance. Therefore, by selecting at least one impedance that meets the conditions required by the preset corresponding relationship from the impedances corresponding to the excitation signals of different frequencies as the target impedance, compared with randomly selecting an impedance as the target impedance, the gas pressure in the battery determined by this scheme is more accurate.

[0011] In some embodiments, determining the target impedance from the impedances corresponding to the excitation signals of different frequencies includes: sorting the excitation signals of different frequencies according to their magnitudes; and selecting the impedance in a preset sequence as the target impedance.

[0012] In the above scheme, the air pressures corresponding to impedances in different positions in the preset corresponding relationship may be different. Compared with randomly selecting impedances in a position sequence as target impedances, the accuracy of the detected air pressure can be guaranteed by selecting impedances in a preset position sequence as target impedances.

[0013] In some embodiments, the battery air pressure detection method also includes: when the air pressure in the test battery is at different air pressure values, inputting multiple test frequency excitation signals to the piezoelectric device on the test battery respectively; obtaining the test impedance of the piezoelectric device at each test frequency under different air pressure values; for each air pressure value, selecting at least one test impedance from the test impedances corresponding to the air pressure value as the target test impedance; establishing a relationship between the frequencies corresponding to each target test impedance and each air pressure value, and determining a preset corresponding relationship.

[0014] In the above scheme, by controlling the air pressure of the test battery to be at different air pressure values, multiple excitation signals of test frequencies are input into the piezoelectric device on the test battery, so that the differences between different frequencies corresponding to the target test impedance at different air pressure values ​​can be observed, such as the frequency difference corresponding to the minimum impedance or the maximum impedance at each air pressure value, and then the preset corresponding relationship is determined according to the relationship between the frequency corresponding to each target test impedance and each air pressure value, so as to facilitate the subsequent determination of the air pressure in the battery using the target frequency corresponding to the target impedance and the preset corresponding relationship.

[0015] In some embodiments, different frequencies are within a target frequency range, each test frequency is within a test frequency range, the test frequency range includes the target frequency range, and for each air pressure value, at least one test impedance is selected from each test impedance corresponding to the air pressure value as the target test impedance, including: determining the target frequency range from the test frequency range; determining the target test impedance from a test impedance region corresponding to the target frequency range, the test impedance region being an interval where the test impedance of the air pressure value within the target frequency range is located.

[0016] In the above scheme, the test impedance corresponding to the same test frequency under different air pressure values ​​may be slightly different in the test frequency range, which makes it inconvenient to distinguish different air pressure values. If the entire test frequency range is used as the target frequency range, it may lead to inaccurate preset corresponding relationship. Therefore, the scheme can improve the accuracy of the preset corresponding relationship determined subsequently by selecting the target frequency range from the test frequency range.

[0017] In some embodiments, different frequencies are within a target frequency range, each test frequency is within a test frequency range, the test frequency range includes the target frequency range, the difference between the test impedances corresponding to different air pressure values ​​at the same test frequency in the target frequency range is greater than the difference between the test impedances corresponding to different air pressure values ​​at the same test frequency in other frequency ranges, and the other frequency ranges are frequency ranges in the test frequency range except the target frequency range.

[0018] In the above scheme, by selecting a frequency range in which the test impedance difference at different air pressure values ​​is large from the test frequency range as the target frequency range, and determining the target test impedance according to the impedances within the range, thereby establishing a corresponding preset correspondence, the detection efficiency and the accuracy of the detected air pressure in the subsequent battery air pressure detection process can be reduced.

[0019] In some embodiments, the target impedance is the maximum impedance or the minimum impedance, the target test impedance is the maximum test impedance or the minimum test impedance of the air pressure value in the test impedance area, and the preset corresponding relationship is determined based on the frequency corresponding to each target test impedance and each air pressure value, including: fitting the frequency corresponding to each maximum test impedance or minimum test impedance and each air pressure value to obtain a fitting line of the frequency and the air pressure value; based on the fitting line, determining the preset corresponding relationship.

[0020] In the above scheme, within the target frequency range, the difference between the maximum impedance or the frequency corresponding to the impedance of different air pressure values ​​is large, so a preset corresponding relationship is established through the maximum test impedance or the minimum test impedance, so that the air pressure value determined subsequently is more accurate.

[0021] In some embodiments, when the air pressure in the test battery is at different pressure values, multiple excitation signals of test frequencies are respectively input to the piezoelectric device on the test battery, including: using an air pressure control component to control the air pressure in the test battery, and the air pressure control component is connected to the test battery through a through hole opened on the test battery.

[0022] In the above solution, the air pressure in the battery can be controlled to be at a specific air pressure value through the air pressure control component, and the impedance corresponding to the excitation signal of different frequencies is determined at different air pressure values, thereby establishing the preset corresponding relationship.

[0023] In some embodiments, after determining the target impedance from the impedances corresponding to excitation signals of different frequencies and determining the air pressure value in the battery that matches the target impedance, the battery air pressure detection method also includes: in response to the air pressure value in the battery being greater than or equal to a preset air pressure value, executing a preset alarm process.

[0024] In the above scheme, by executing the preset alarm process when the air pressure value in the battery is greater than or equal to the preset air pressure value, accidents caused by excessive air pressure value in the battery can be reduced.

[0025] The present application provides an air pressure detection device for a battery, comprising: a signal input module, an impedance acquisition module, and an air pressure determination module; the signal input module is used to input excitation signals of different frequencies to a piezoelectric device arranged on the battery; the impedance acquisition module is used to obtain the impedance of the piezoelectric device under excitation signals of different frequencies; the air pressure determination module is used to determine the target impedance from the impedances corresponding to the excitation signals of different frequencies, and determine the air pressure value in the battery that matches the target impedance.

[0026] The present application provides a battery air pressure detection device, including an impedance acquisition component and a processor, wherein the impedance acquisition component is used to connect to a piezoelectric device arranged on the battery, and is used to input excitation signals of different frequencies to the piezoelectric device arranged on the battery, and obtain the impedance of the piezoelectric device under the excitation signals of different frequencies; the processor is connected to the impedance acquisition component, and is used to determine the target impedance from the impedances corresponding to the excitation signals of different frequencies, and determine the air pressure value in the battery that matches the target impedance.

[0027] The present application provides an air pressure detection system for a battery, which includes an impedance acquisition device and an electronic device that establishes a communication connection with the impedance acquisition device. The impedance acquisition device is used to connect to a piezoelectric device arranged on the battery, and is used to input excitation signals of different frequencies to the piezoelectric device arranged on the battery, and obtain the impedance of the piezoelectric device under the excitation signals of different frequencies. The electronic device is used to determine the target impedance from the impedances corresponding to the excitation signals of different frequencies, and determine the air pressure value in the battery that matches the target impedance.

[0028] In the above scheme, an excitation signal is input to the piezoelectric device arranged on the battery. The piezoelectric device causes the battery to vibrate after receiving the excitation signal. Since the air pressure in the battery is different, the vibration form of the battery may be different, and the vibration of the battery affects the impedance of the piezoelectric device through the positive piezoelectric effect. Therefore, the air pressure value in the battery can be determined based on the impedance of the piezoelectric device under excitation signals of different frequencies. Compared with the drainage method, this scheme does not need to destroy the structure of the battery, nor does it need to pull out the relevant pipelines to detect the air pressure in the battery.

[0029] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The drawings herein are incorporated into the specification and constitute a part of the specification. These drawings illustrate embodiments consistent with the present application and are used together with the specification to illustrate the technical solution of the present application.

[0031] Figure 1 is a flow chart of an embodiment of a method for detecting air pressure of a battery provided in some embodiments;

[0032] Figure 2 is a schematic diagram of the placement of various piezoelectric devices provided in some embodiments;

[0033] Figure 3 is a schematic diagram of a sub-flow chart of step S13 provided in some embodiments;

[0034] Figure 4 is another flow chart of a method for detecting air pressure of a battery provided in some embodiments;

[0035] Figure 5 is a schematic diagram of test impedance of a piezoelectric device at various test frequencies at different air pressure values ​​in an air pressure detection method for a battery provided in some embodiments;

[0036] Figure 6 is a scatter plot of the relationship between air pressure and frequency in the air pressure detection method provided in some embodiments;

[0037] Figure 7 is a structural schematic diagram of an embodiment of a battery air pressure detection device provided in some embodiments;

[0038] Figure 8 is a structural schematic diagram of an embodiment of a battery air pressure detection device provided in some embodiments;

[0039] Fig. 9 It is a structural schematic diagram of an embodiment of an air pressure detection system provided in some embodiments. DETAILED DESCRIPTION

[0040] The scheme of the embodiment of the present application is described in detail below in conjunction with the drawings of the specification.

[0041] In the following description, for the purpose of explanation rather than limitation, specific details such as specific subsystem structures, interfaces, and technologies are provided to facilitate a thorough understanding of the present application.

[0042] The term "and / or" in this article is only a description of the association relationship of associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the objects associated before and after are in an "or" relationship. In addition, "many" in this article means two or more than two. In addition, the term "at least one" in this article means any combination of at least two of any one or more of a plurality of, for example, including at least one of A, B, and C, can mean including any one or more elements selected from the set consisting of A, B, and C.

[0043] Considering that abnormal gas pressure in the battery is likely to affect the health of the battery, how to detect the gas pressure in the battery is a relatively important topic. At present, the main methods for sampling the gas pressure in the battery include the water discharge method and the paraffin discharge method, but the water discharge method and the paraffin discharge method will damage the structure of the battery.

[0044] This scheme proposes a method for detecting the air pressure of a battery, by inputting an excitation signal to a piezoelectric device arranged on the battery, the piezoelectric device causes the battery to vibrate after receiving the excitation signal, because the air pressure in the battery is different, the vibration frequency and amplitude of the battery may be different, and the vibration of the battery affects the impedance of the piezoelectric device through the positive piezoelectric effect, that is, under the condition of different air pressures in the battery, if excitation signals of different frequencies are input to the piezoelectric device, the impedance reflected by the piezoelectric device will be different under the excitation of different excitation signals, so that the air pressure value in the battery can be determined based on the impedance of the piezoelectric device under the excitation signals of different frequencies, and the air pressure in the battery can be detected without destroying the structure of the battery.

[0045] See also Figure 1 The gas pressure detection method of the battery provided in the present application may include the contents of the following steps S11 to S13. Step S11: Input excitation signals of different frequencies to the piezoelectric device arranged on the battery respectively. Step S12: Obtain the impedance of the piezoelectric device under the excitation signals of different frequencies. Step S13: Determine the target impedance from the impedances corresponding to the excitation signals of different frequencies, and determine the gas pressure value in the battery that matches the target impedance.

[0046] The air pressure detection method provided in this solution can be performed by an air pressure detection device. The voltage device can be a piezoelectric sheet or any other device that can produce mechanical deformation with the change of voltage and frequency when voltage is applied to the piezoelectric device. When the piezoelectric device is vibrated, an electric charge is generated. In this embodiment, the piezoelectric device is a piezoelectric sheet as an example. The material of the piezoelectric device is not limited, and can be an organic material or an inorganic material (such as ceramics, etc.). The position of the piezoelectric device on the battery can be anywhere on the outside of the battery. Please refer to Figure 2 The piezoelectric sheet can be on the top, front or side of the battery casing. Figure 2 The example of possible installation positions of the piezoelectric sheet is only given, and it does not mean that three piezoelectric sheets are required to detect the air pressure in the battery. Inputting excitation signals of different frequencies to the piezoelectric device set on the battery can be understood as the frequencies of the excitation signals input at different times are different. The excitation signal can be a current signal or a voltage signal. After receiving the excitation signal, the piezoelectric device causes the battery to vibrate. Because the air pressure in the battery is different, the vibration form of the battery may be different, and the vibration of the battery affects the impedance of the piezoelectric device through the positive piezoelectric effect, so the impedance of the piezoelectric device under the action of excitation signals of different frequencies can be collected. The way to obtain the impedance of the piezoelectric device can be to use an impedance acquisition device or a circuit with an impedance acquisition function to collect the impedance of the piezoelectric device. There are many ways to collect the impedance of a certain device, which are not specifically limited here. The impedance at different frequencies may be different. The way to determine the target impedance from the impedance corresponding to the excitation signal of different frequencies can be to select an impedance in a specific size sequence among the impedances as the target impedance. The number of target impedances can be one or more. The method of determining the air pressure value in the battery that matches the target impedance according to the target impedance can be to determine the air pressure value according to the change law between the target impedances, or to determine the air pressure value based on the corresponding relationship between the target impedance and a preset value. The air pressure value can also be first determined based on the corresponding relationship between each target impedance and a preset value, and then the air pressure values ​​are weighted according to the weight corresponding to each target impedance to obtain the final air pressure value. It can be seen that there are many ways to determine the target impedance, which are not specifically limited here.

[0047] In the above scheme, an excitation signal is input to the piezoelectric device arranged on the battery. The piezoelectric device causes the battery to vibrate after receiving the excitation signal. Since the air pressure in the battery is different, the vibration form of the battery may be different, and the vibration of the battery affects the impedance of the piezoelectric device through the positive piezoelectric effect. Therefore, the air pressure value in the battery can be determined based on the impedance of the piezoelectric device under excitation signals of different frequencies. Compared with the drainage method, this scheme does not need to destroy the structure of the battery, nor does it need to pull out the relevant pipelines to detect the air pressure in the battery.

[0048] In some embodiments, see Figure 3The above-mentioned determination of the air pressure value in the battery that matches the target impedance may include step S131 and step S132. Step S131: taking the frequency corresponding to the target impedance as the target frequency. Step S132: determining the air pressure value that matches the target frequency in a preset corresponding relationship, wherein the preset corresponding relationship represents the corresponding relationship between the frequency and the air pressure value.

[0049] Each frequency of the excitation signal corresponds to an impedance, and the frequency corresponding to the target impedance is the target frequency. The preset corresponding relationship can be constructed based on the relationship between the frequency of the excitation signal and the air pressure value, and then the air pressure value in the battery can be determined according to the preset corresponding relationship and the target frequency.

[0050] Exemplarily, different air pressure values ​​have different target impedances at different frequencies. For example, the lowest impedance of air pressure value a under excitation signals of different frequencies is m, the lowest impedance of air pressure value b under excitation signals of different frequencies is n, and the lowest impedance of air pressure value c under excitation signals of different frequencies is k. m, n, and k are different. The frequency corresponding to m is x, the frequency corresponding to n is v, and the frequency corresponding to k is e. v, x, and e are different. In other words, this scheme uses the lowest impedance among the impedances corresponding to excitation signals of different frequencies as the target impedance, and then determines the air pressure in the battery according to the frequency corresponding to the target impedance. For example, if the target impedance is m, and the frequency corresponding to the target impedance is exactly x, according to the pre-established correspondence, the air pressure in the battery can be determined to be x. Assuming that the target impedance is m, but the frequency corresponding to the target impedance is not x, we can estimate the air pressure in the battery according to the pre-established correspondence to obtain the air pressure value in the battery.

[0051] In the above scheme, by establishing a corresponding relationship between frequency and air pressure value, and then determining the target impedance from various impedances, it is possible to determine the air pressure in the battery according to the frequency corresponding to the target impedance.

[0052] In some embodiments, determining the target impedance from the impedances corresponding to the excitation signals of different frequencies includes: selecting at least one impedance that meets the conditions required by the preset corresponding relationship from the impedances corresponding to the excitation signals of different frequencies as the target impedance.

[0053] At least one impedance may be one impedance or two or more impedances. The conditions required to satisfy the preset correspondence may be understood to be the same as the characteristics of the impedance used when establishing the preset correspondence. Optionally, the conditions required for the preset correspondence include being in a preset sequence in the impedances corresponding to the excitation signals of different frequencies, sorted by size. Exemplarily, the frequencies corresponding to the lowest impedances reflected by the different air pressure values ​​used when establishing the preset correspondence under the excitation signals of different frequencies, then the target impedance is the lowest impedance under the excitation signals of different frequencies, or the highest impedance is used when establishing the preset relationship, then the target impedance is the highest impedance under the excitation signals of different frequencies. Or the lowest impedance and the highest impedance are used when establishing the preset correspondence, then the target impedance includes the lowest impedance and the highest impedance under the excitation signals of different frequencies.

[0054] In the above scheme, the preset corresponding relationship can be established according to the frequency corresponding to a specific impedance. Therefore, by selecting at least one impedance that meets the conditions required by the preset corresponding relationship from the impedances corresponding to the excitation signals of different frequencies as the target impedance, compared with randomly selecting an impedance as the target impedance, the gas pressure in the battery determined by this scheme is more accurate.

[0055] In some embodiments, determining the target impedance from the impedances corresponding to the excitation signals of different frequencies includes: sorting the excitation signals of different frequencies according to their magnitudes; and selecting the impedance in a preset sequence as the target impedance.

[0056] In the above scheme, the air pressures corresponding to impedances in different positions in the preset corresponding relationship may be different. Compared with randomly selecting impedances in a position sequence as target impedances, the accuracy of the detected air pressure can be guaranteed by selecting impedances in a preset position sequence as target impedances.

[0057] In some embodiments, see Figure 4 , the battery air pressure detection method also includes: step S21: when the air pressure in the test battery is at different air pressure values, input multiple test frequency excitation signals to the piezoelectric device on the test battery respectively. Step S22: obtain the test impedance of the piezoelectric device at each test frequency under different air pressure values. Step S23: for each air pressure value, select at least one test impedance from each test impedance corresponding to the air pressure value as the target test impedance. Step S24: establish the relationship between the frequency corresponding to each target test impedance and each air pressure value, and determine the preset corresponding relationship.

[0058] Among them, the test battery and the battery that needs to be tested for air pressure are the same type of battery, that is, the structure is the same, so as to ensure the accuracy of the air pressure detection result. Optionally, the setting position of the piezoelectric device on the test battery is the same as the setting position of the piezoelectric device on the battery that needs to be tested for air pressure, which can ensure the accuracy of the air pressure detection result. In other embodiments, the setting position of the piezoelectric device may also be different. Optionally, the piezoelectric device used in establishing the preset correspondence relationship and the piezoelectric device used in the subsequent air pressure detection should be the same type of piezoelectric device, such as the same material, size, etc. In the case of different air pressure values ​​in the test battery, the piezoelectric device on the test battery is input with multiple test frequency excitation signals. Specifically, when the air pressure in the test battery is at air pressure a, the piezoelectric device on the test battery is input with multiple test frequency excitation signals, and when the air pressure in the test battery is at air pressure b, the piezoelectric device on the test battery is input with multiple test frequency excitation signals, and when the air pressure in the test battery is at air pressure c, the piezoelectric device on the test battery is input with multiple test frequency excitation signals...

[0059] The test impedance of the piezoelectric device at each test frequency under different air pressure values ​​is as follows: Figure 5 As shown, Figure 5 The vertical axis represents impedance, the horizontal axis represents the frequency of the excitation signal, and the different lines represent the air pressure value in the battery. Obviously, Figure 5 The difference between the air pressure values ​​with different frequencies circled in the box is large, while the impedance difference corresponding to different air pressure values ​​at other frequencies is small. The different materials of the piezoelectric device or the different settings of the piezoelectric device on the battery may cause the piezoelectric device to react to different impedances under different frequency excitation signals at different air pressure values. Figure 5 This is just an example. In step S23, for each air pressure value, at least one test impedance is selected from each test impedance corresponding to the air pressure value as the target test impedance. Specifically, for air pressure value a, one or more test impedances are selected from each test impedance corresponding to air pressure value a as the target test impedance, one or more test impedances are selected from each test impedance corresponding to air pressure value b as the target test impedance, one or more test impedances are selected from each test impedance corresponding to air pressure value c as the target test impedance, and so on. Please refer to Figure 6 , the selected target test impedance can establish a scatter plot between air pressure and frequency, Figure 6 Only the Figure 5 Then, a preset correspondence can be established based on the scatter plot between air pressure and frequency.

[0060] In the above scheme, by controlling the air pressure of the test battery to be at different air pressure values, multiple excitation signals of test frequencies are input into the piezoelectric device on the test battery, so that the differences between different frequencies corresponding to the target test impedance at different air pressure values ​​can be observed, such as the frequency difference corresponding to the minimum impedance or the maximum impedance at each air pressure value, and then the preset corresponding relationship is determined according to the relationship between the frequency corresponding to each target test impedance and each air pressure value, so as to facilitate the subsequent determination of the air pressure in the battery using the target frequency corresponding to the target impedance and the preset corresponding relationship.

[0061] In some embodiments, different frequencies are within a target frequency range, each test frequency is within a test frequency range, and the test frequency range includes the target frequency range. The step of selecting at least one test impedance as a target test impedance from each test impedance corresponding to the air pressure value for each air pressure value may include: determining the target frequency range from the test frequency range. Then, determining the target test impedance from the test impedance region corresponding to the target frequency range. The test impedance region is the interval where the test impedance of the air pressure value within the target frequency range is located.

[0062] The test frequency range is wide, and it is possible that the impedance of the piezoelectric device may not differ much under the excitation signal of the same frequency for some air pressure values, for example Figure 5 Under the action of the excitation signal with a frequency of 666000MHZ to 978000MHZ, the impedance corresponding to each air pressure value is almost the same. If the test frequency range is used as the target frequency range, it is likely that the preset corresponding relationship obtained is not very accurate. Therefore, this scheme selects a frequency range from the test frequency range as the target frequency range, and then determines the target test impedance from the target frequency range, so that the preset corresponding relationship obtained is more accurate.

[0063] In the above scheme, the test impedance corresponding to the same test frequency under different air pressure values ​​may be slightly different in the test frequency range, which makes it inconvenient to distinguish different air pressure values. If the entire test frequency range is used as the target frequency range, it may lead to inaccurate preset corresponding relationship. Therefore, the scheme can improve the accuracy of the preset corresponding relationship determined subsequently by selecting the target frequency range from the test frequency range.

[0064] In some embodiments, different frequencies are within a target frequency range, each test frequency is within a test frequency range, and the test frequency range includes the target frequency range. The difference between the test impedances corresponding to different air pressure values ​​at the same test frequency in the target frequency range is greater than the difference between the test impedances corresponding to different air pressure values ​​at the same test frequency in other frequency ranges, and the other frequency ranges are frequency ranges other than the target frequency range in the test frequency range.

[0065] Alternatively, the difference between different test frequencies corresponding to the same impedance at different air pressure values ​​in the target frequency range is greater than the difference between different test frequencies corresponding to the same impedance at different air pressure values ​​in other frequencies. Figure 5 Frequency range marked with boxes.

[0066] In the above scheme, by selecting a frequency range in which the test impedance difference at different air pressure values ​​is large from the test frequency range as the target frequency range, and determining the target test impedance according to the impedances within the range, thereby establishing a corresponding preset correspondence, the detection efficiency and the accuracy of the detected air pressure in the subsequent battery air pressure detection process can be reduced.

[0067] In some embodiments, the target impedance is the maximum impedance or the minimum impedance, and the target test impedance is the maximum test impedance or the minimum test impedance of the air pressure value in the test impedance region. The above-mentioned method of determining the preset corresponding relationship based on the frequency corresponding to each target test impedance and each air pressure value can be: fitting the frequency corresponding to each maximum test impedance or minimum test impedance and each air pressure value to obtain a fitting line of the frequency and the air pressure value. Based on the fitting line, the preset corresponding relationship is determined.

[0068] The fitting line can be a straight line or a curve. This solution takes the fitting line as a straight line as an example. The specific fitting method can be to select a straight line so that the sum of the distances between the straight line and all the scattered points is the smallest to obtain the fitting line. Of course, there are many ways to obtain the fitting line or fitting curve by fitting the specific scattered points, which are not specifically limited here. For example, Figure 6 The scatter plot in is fitted, and the fitted straight line y = -77.718x + 498676 is obtained. The fitting degree R 2 =0.9937. Wherein, y represents frequency, x represents air pressure value, and the preset corresponding relationship can be specifically understood as the expression of the fitting line. The target frequency corresponding to the target impedance can be substituted into the expression of the fitting line to obtain the air pressure value in the battery.

[0069] In the above scheme, within the target frequency range, the difference between the maximum impedance or the frequency corresponding to the impedance of different air pressure values ​​is large, so a preset corresponding relationship is established through the maximum test impedance or the minimum test impedance, so that the air pressure value determined subsequently is more accurate.

[0070] In some embodiments, when the air pressure in the test battery is at different pressure values, inputting multiple test frequency excitation signals to the piezoelectric device on the test battery respectively includes: controlling the air pressure in the test battery by using an air pressure control component. The air pressure control component is connected to the test battery through a through hole opened on the test battery.

[0071] The air pressure control component can be any component that can detect the air pressure in the test battery and adjust the air pressure in the test battery. Specifically, a through hole can be opened in the shell of the test battery, and the gas transmission channel in the air pressure control component is connected to the battery through the through hole, and then the interface controls the air pressure in the test battery.

[0072] In the above solution, the air pressure in the battery can be controlled to be at a specific air pressure value through the air pressure control component, and the impedance corresponding to the excitation signal of different frequencies is determined at different air pressure values, thereby establishing the preset corresponding relationship.

[0073] In some embodiments, after determining the target impedance from the impedances corresponding to excitation signals of different frequencies and determining the air pressure value in the battery that matches the target impedance, the battery air pressure detection method also includes: in response to the air pressure value in the battery being greater than or equal to a preset air pressure value, executing a preset alarm process.

[0074] The preset air pressure value can be set according to the requirements, and no specific provisions are made here. The preset alarm processing can be to display an alarm light, or to issue an alarm voice, or to send an alarm message to a preset recipient. The specific form of the preset alarm processing is not specifically limited here.

[0075] In the above scheme, by executing the preset alarm process when the air pressure value in the battery is greater than or equal to the preset air pressure value, accidents caused by excessive air pressure value in the battery can be reduced.

[0076] In some embodiments, the piezoelectric device may be a piezoelectric sheet. The battery may be a battery cell, and the piezoelectric sheet may be coupled to the shell of the battery cell. The specific coupling method includes, but is not limited to, bonding with epoxy resin glue or other adhesive glue, the two electrodes on the piezoelectric sheet are connected to the impedance acquisition component in the air pressure detection device or the impedance acquisition device in the air pressure detection system, and an excitation signal (electrical signal) is applied to the piezoelectric sheet through the two electrodes. The piezoelectric sheet can be set at any position on the shell of the battery. The piezoelectric sheet causes the coupled shell to vibrate, and the mechanical properties of the shell will be reflected in its vibration form, and the vibration of the shell causes the piezoelectric sheet to feedback the corresponding electrical signal through the positive piezoelectric effect. The feedback electrical signal carries the change in the mechanical properties of the shell (associated with the change in the internal air pressure), and the electrical signal collected by the impedance acquisition component or the impedance acquisition device determines its impedance and / or admittance value, and the mechanical properties of the battery shell (internal air pressure) are characterized by its impedance or admittance value.

[0077] In one embodiment, a battery of the same model is opened on the top cover of the shell, connected to the air pressure control component through a conduit, and the air pressure control component is used to control the air pressure inside the battery to a fixed value, and then the impedance amplitude of the piezoelectric piece as the frequency changes is collected through the impedance acquisition module to obtain the frequency-impedance amplitude curve under different air pressures, for example, the frequency is swept from the frequency range of 10KHz-1MHz to obtain the impedance amplitude and frequency curve. According to the characteristics of the curve, the frequency value of the lowest amplitude (lowest impedance) in the characteristic frequency area and the air pressure value are selected to form a frequency-air pressure scatter plot. The scatter plot is fitted to obtain the corresponding fitting line and expression of frequency-air pressure. The battery to be tested must be a battery of the same system. The piezoelectric piece is coupled to the same position of the battery shell, and the impedance amplitude of different frequencies is collected by the impedance acquisition module. The frequency of the lowest amplitude in the corresponding characteristic frequency area is selected. Through the expression, combined with the frequency of the lowest amplitude, the real-time air pressure value of the battery can be obtained. For example, the expression can be: y = -77.718x + 498676, where y is the frequency and x is the air pressure inside the battery. When the same type of battery is coupled to the piezoelectric sheet at the same position on the top cover, and the resonant frequency measured above is y1, the internal air pressure can be obtained by the above expression:

[0078] (498676-y1) / 77.718kPa.

[0079] In one embodiment, a battery of the same model is opened at the bottom end of a side wall of the shell, connected to the air pressure control component through a conduit, and the air pressure control component is used to control the air pressure inside the battery to a fixed value, and then the impedance amplitude of the piezoelectric sheet as the frequency changes is collected through the impedance acquisition module to obtain the frequency-impedance amplitude curve under different air pressures. According to the characteristics of the curve, the frequency value of the lowest amplitude (lowest impedance) in the characteristic frequency area and the air pressure value are selected to form a frequency-air pressure scatter plot. The scatter plot is fitted to obtain the corresponding fitting line and expression of frequency-air pressure. The battery to be tested must be a battery of the same system. The piezoelectric sheet is coupled to the same position of the battery shell, and the impedance acquisition module is used to collect the impedance amplitude of different frequencies. The frequency of the lowest amplitude in the corresponding characteristic frequency area is selected. Through the expression, combined with the frequency of the lowest amplitude, the real-time air pressure value of the battery can be obtained. For example, the expression can be: y = 167.78x + 506710, where y is the frequency and x is the air pressure inside the battery cell. When the same type of battery cell is coupled to the piezoelectric sheet at the same position on the top cover, and the resonant frequency measured above is y2, the internal air pressure can be obtained by the above expression:

[0080] (y2-506710) / 167.78kPa.

[0081] This solution uses piezoelectric impedance technology to achieve real-time monitoring of the gas pressure inside the battery. Specifically, the frequency change at the lowest impedance point is linearly correlated with the gas pressure change, so as to achieve real-time characterization of the gas pressure inside the battery cell.

[0082] See also Figure 7 The air pressure detection device 30 provided in the present application includes a signal input module 31, an impedance acquisition module 32, and an air pressure determination module 33; the signal input module 31 is used to input excitation signals of different frequencies to the piezoelectric device arranged on the battery; the impedance acquisition module 32 is used to obtain the impedance of the piezoelectric device under the excitation signals of different frequencies; the air pressure determination module 33 is used to determine the target impedance from the impedances corresponding to the excitation signals of different frequencies, and determine the air pressure value in the battery that matches the target impedance.

[0083] In the above scheme, an excitation signal is input to the piezoelectric device arranged on the battery. The piezoelectric device causes the battery to vibrate after receiving the excitation signal. Since the air pressure in the battery is different, the vibration form of the battery may be different, and the vibration of the battery affects the impedance of the piezoelectric device through the positive piezoelectric effect. Therefore, the air pressure value in the battery can be determined based on the impedance of the piezoelectric device under excitation signals of different frequencies. Compared with the drainage method, this scheme does not need to destroy the structure of the battery, nor does it need to pull out the relevant pipelines to detect the air pressure in the battery.

[0084] In some embodiments, the air pressure determination module 33 determines the air pressure value in the battery that matches the target impedance, including: taking the frequency corresponding to the target impedance as the target frequency; determining the air pressure value that matches the target frequency in a preset corresponding relationship, and the preset corresponding relationship represents the correspondence between the frequency and the air pressure value.

[0085] In the above scheme, by establishing a corresponding relationship between frequency and air pressure value, and then determining the target impedance from various impedances, it is possible to determine the air pressure in the battery according to the frequency corresponding to the target impedance.

[0086] In some embodiments, the air pressure determination module 33 determines the target impedance from the impedances corresponding to the excitation signals of different frequencies, including: selecting at least one impedance that meets the conditions required by the preset corresponding relationship from the impedances corresponding to the excitation signals of different frequencies as the target impedance.

[0087] In the above scheme, the preset corresponding relationship can be established according to the frequency corresponding to a specific impedance. Therefore, by selecting at least one impedance that meets the conditions required by the preset corresponding relationship from the impedances corresponding to the excitation signals of different frequencies as the target impedance, compared with randomly selecting an impedance as the target impedance, the gas pressure in the battery determined by this scheme is more accurate.

[0088] In some embodiments, determining the target impedance from the impedances corresponding to the excitation signals of different frequencies includes: sorting the excitation signals of different frequencies according to their magnitudes; and selecting the impedance in a preset sequence as the target impedance.

[0089] In the above scheme, the air pressures corresponding to impedances in different positions in the preset corresponding relationship may be different. Compared with randomly selecting impedances in a position sequence as target impedances, the accuracy of the detected air pressure can be guaranteed by selecting impedances in a preset position sequence as target impedances.

[0090] In some embodiments, the air pressure detection device 30 of the battery also includes a relationship determination module (not shown), which is used to: when the air pressure in the test battery is at different air pressure values, input multiple test frequency excitation signals to the piezoelectric device on the test battery respectively; obtain the test impedance of the piezoelectric device at each test frequency under different air pressure values; for each air pressure value, select at least one test impedance as the target test impedance from the test impedances corresponding to the air pressure value; establish the relationship between the frequencies corresponding to each target test impedance and each air pressure value, and determine the preset corresponding relationship.

[0091] In the above scheme, by controlling the air pressure of the test battery to be at different air pressure values, multiple excitation signals of test frequencies are input into the piezoelectric device on the test battery, so that the differences between different frequencies corresponding to the target test impedance at different air pressure values ​​can be observed, such as the frequency difference corresponding to the minimum impedance or the maximum impedance at each air pressure value, and then the preset corresponding relationship is determined according to the relationship between the frequency corresponding to each target test impedance and each air pressure value, so as to facilitate the subsequent determination of the air pressure in the battery using the target frequency corresponding to the target impedance and the preset corresponding relationship.

[0092] In some embodiments, different frequencies are within a target frequency range, each test frequency is within a test frequency range, the test frequency range includes the target frequency range, and the relationship determination module selects at least one test impedance as a target test impedance from each test impedance corresponding to the air pressure value for each air pressure value, including: determining the target frequency range from the test frequency range; determining the target test impedance from a test impedance region corresponding to the target frequency range, the test impedance region being an interval where the test impedance of the air pressure value within the target frequency range is located.

[0093] In the above scheme, the test impedance corresponding to the same test frequency under different air pressure values ​​may be slightly different in the test frequency range, which makes it inconvenient to distinguish different air pressure values. If the entire test frequency range is used as the target frequency range, it may lead to inaccurate preset corresponding relationship. Therefore, the scheme can improve the accuracy of the preset corresponding relationship determined subsequently by selecting the target frequency range from the test frequency range.

[0094] In some embodiments, different frequencies are within a target frequency range, each test frequency is within a test frequency range, the test frequency range includes the target frequency range, the difference between the test impedances corresponding to different air pressure values ​​at the same test frequency in the target frequency range is greater than the difference between the test impedances corresponding to different air pressure values ​​at the same test frequency in other frequency ranges, and the other frequency ranges are frequency ranges in the test frequency range except the target frequency range.

[0095] In the above scheme, by selecting a frequency range in which the test impedance difference at different air pressure values ​​is large from the test frequency range as the target frequency range, and determining the target test impedance according to the impedances within the range, thereby establishing a corresponding preset correspondence, the detection efficiency and the accuracy of the detected air pressure in the subsequent battery air pressure detection process can be reduced.

[0096] In some embodiments, the target impedance is the maximum impedance or the minimum impedance, the target test impedance is the maximum test impedance or the minimum test impedance of the air pressure value in the test impedance area, and the relationship determination module determines the preset corresponding relationship based on the frequency corresponding to each target test impedance and each air pressure value, including: fitting the frequency corresponding to each maximum test impedance or minimum test impedance and each air pressure value to obtain a fitting line of the frequency and the air pressure value; based on the fitting line, determining the preset corresponding relationship.

[0097] In the above scheme, within the target frequency range, the difference between the maximum impedance or the frequency corresponding to the impedance of different air pressure values ​​is large, so a preset corresponding relationship is established through the maximum test impedance or the minimum test impedance, so that the air pressure value determined subsequently is more accurate.

[0098] In some embodiments, the relationship determination module inputs multiple excitation signals of test frequencies to the piezoelectric device on the test battery when the air pressure in the test battery is at different air pressure values, including: using an air pressure control component to control the air pressure in the test battery, and the air pressure control component is connected to the test battery through a through hole opened on the test battery.

[0099] In the above solution, the air pressure in the battery can be controlled to be at a specific air pressure value through the air pressure control component, and the impedance corresponding to the excitation signal of different frequencies is determined at different air pressure values, thereby establishing the preset corresponding relationship.

[0100] In some embodiments, after determining the target impedance from the impedances corresponding to excitation signals of different frequencies and determining the air pressure value in the battery that matches the target impedance, the air pressure detection device of the battery also includes an alarm module (not shown), and the alarm module is used to: in response to the air pressure value in the battery being greater than or equal to a preset air pressure value, execute a preset alarm process.

[0101] In the above scheme, by executing the preset alarm process when the air pressure value in the battery is greater than or equal to the preset air pressure value, accidents caused by excessive air pressure value in the battery can be reduced.

[0102] See also Figure 8 The air pressure detection device 40 of the battery provided in the embodiment of the present application includes an impedance acquisition component 41 and a processor 42. The impedance acquisition component 41 is used to connect with the piezoelectric device set on the battery, and is used to input excitation signals of different frequencies to the piezoelectric device set on the battery, and obtain the impedance of the piezoelectric device under the excitation signals of different frequencies; the processor 42 is connected to the impedance acquisition component 41, and is used to determine the target impedance from the impedances corresponding to the excitation signals of different frequencies, and determine the air pressure value in the battery that matches the target impedance. The processor 42 in the air pressure detection device 40 cooperates with the impedance acquisition component 41 to implement the air pressure detection method provided in the above air pressure detection method embodiment.

[0103] The processor 42 may also be referred to as a CPU (Central Processing Unit). The processor 42 may be an integrated circuit chip having the ability to process signals. The processor 42 may also be a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components. A general-purpose processor may be a microprocessor or the processor may also be any conventional processor, etc. In addition, the processor 42 may be implemented by an integrated circuit chip.

[0104] In the above scheme, an excitation signal is input to the piezoelectric device arranged on the battery. The piezoelectric device causes the battery to vibrate after receiving the excitation signal. Since the air pressure in the battery is different, the vibration form of the battery may be different, and the vibration of the battery affects the impedance of the piezoelectric device through the positive piezoelectric effect. Therefore, the air pressure value in the battery can be determined based on the impedance of the piezoelectric device under excitation signals of different frequencies. Compared with the drainage method, this scheme does not need to destroy the structure of the battery, nor does it need to pull out the relevant pipelines to detect the air pressure in the battery.

[0105] See also Fig. 9The air pressure detection system 50 of the battery provided in the embodiment of the present application includes an impedance acquisition device 51 and an electronic device 52 that establishes a communication connection with the impedance acquisition device. The impedance acquisition device 51 is used to connect with the piezoelectric device provided on the battery, and is used to input excitation signals of different frequencies to the piezoelectric device provided on the battery, and obtain the impedance of the piezoelectric device under the excitation signals of different frequencies. The electronic device 52 is used to determine the target impedance from the impedances corresponding to the excitation signals of different frequencies, and determine the air pressure value in the battery that matches the target impedance. The air pressure detection system 50 can implement the air pressure detection method provided in the above-mentioned air pressure detection method embodiment.

[0106] In the above scheme, an excitation signal is input to the piezoelectric device arranged on the battery. The piezoelectric device causes the battery to vibrate after receiving the excitation signal. Since the air pressure in the battery is different, the vibration form of the battery may be different, and the vibration of the battery affects the impedance of the piezoelectric device through the positive piezoelectric effect. Therefore, the air pressure value in the battery can be determined based on the impedance of the piezoelectric device under excitation signals of different frequencies. Compared with the drainage method, this scheme does not need to destroy the structure of the battery, nor does it need to pull out the relevant pipelines to detect the air pressure in the battery.

[0107] In some embodiments, the functions or modules included in the device provided by the embodiments of the present disclosure can be used to execute the method described in the above method embodiments. The specific implementation can refer to the description of the above method embodiments, and for the sake of brevity, it will not be repeated here.

[0108] The above description of various embodiments tends to emphasize the differences between the various embodiments. The same or similar aspects can be referenced to each other, and for the sake of brevity, they will not be repeated herein.

[0109] In the several embodiments provided in the present application, it should be understood that the disclosed methods and devices can be implemented in other ways. For example, the device implementation described above is only schematic. For example, the division of modules or units is only a logical function division. There may be other division methods in actual implementation. For example, units or components can be combined or integrated into another system, or some features can be ignored or not executed. In another image position, the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, and the indirect coupling or communication connection of devices or units can be electrical, mechanical or other forms.

[0110] In addition, each functional unit in each embodiment of the present application can be integrated into a processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The above-mentioned integrated unit can be implemented in the form of hardware or in the form of a software functional unit. If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application is essentially or the part that contributes to the prior art or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including several instructions to enable a computer device (which can be a personal computer, a server, or a network device, etc.) or a processor (processor) to perform all or part of the steps of each implementation method of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk and other media that can store program code.

Claims

1. A method for detecting the air pressure of a battery, characterized in that: include: Inputting excitation signals of different frequencies to the piezoelectric devices arranged on the battery respectively; Obtaining the impedance of the piezoelectric device under the excitation signals of different frequencies; A target impedance is determined from the impedances corresponding to the excitation signals of different frequencies, and an air pressure value in the battery that matches the target impedance is determined.

2. The air pressure detection method according to claim 1, characterized in that: The determining of the air pressure value in the battery that matches the target impedance includes: Using the frequency corresponding to the target impedance as the target frequency; The air pressure value matching the target frequency is determined in a preset corresponding relationship, wherein the preset corresponding relationship represents a corresponding relationship between the frequency and the air pressure value.

3. The air pressure detection method according to claim 2, characterized in that: The determining the target impedance from the impedances corresponding to the excitation signals of different frequencies comprises: At least one impedance that meets the conditions required by the preset corresponding relationship is selected as the target impedance from the impedances corresponding to the excitation signals of different frequencies.

4. The air pressure detection method according to claim 2, characterized in that: The determining the target impedance from the impedances corresponding to the excitation signals of different frequencies comprises: sorting the excitation signals of different frequencies according to their magnitude; The impedance in the preset sequence is selected as the target impedance.

5. The air pressure detection method according to any one of claims 2 to 4, characterized in that: The air pressure detection method also includes: When the air pressure in the test battery is at different pressure values, inputting excitation signals of multiple test frequencies to the piezoelectric device on the test battery respectively; Obtaining the test impedance of the piezoelectric device at each test frequency under different air pressure values; For each of the air pressure values, selecting at least one test impedance from the test impedances corresponding to the air pressure value as a target test impedance; A relationship between the frequencies corresponding to the target test impedances and the air pressure values ​​is established to determine the preset corresponding relationship.

6. The air pressure detection method according to claim 5, characterized in that: The different frequencies are within a target frequency range, each of the test frequencies is within a test frequency range, the test frequency range includes the target frequency range, and for each of the air pressure values, selecting at least one test impedance from each of the test impedances corresponding to the air pressure value as a target test impedance, comprises: determining the target frequency range from the test frequency range; The target test impedance is determined from a test impedance region corresponding to the target frequency range, where the test impedance region is an interval where the test impedance of the air pressure value within the target frequency range is located.

7. The air pressure detection method according to claim 5 or 6, characterized in that: The different frequencies are within a target frequency range, each of the test frequencies is within a test frequency range, the test frequency range includes the target frequency range, the difference between the test impedances corresponding to different air pressure values ​​at the same test frequency in the target frequency range is greater than the difference between the test impedances corresponding to different air pressure values ​​at the same test frequency in other frequency ranges, and the other frequency range is a frequency range in the test frequency range excluding the target frequency range.

8. The air pressure detection method according to claim 5 or 6, characterized in that: The target impedance is the maximum impedance or the minimum impedance, the target test impedance is the maximum test impedance or the minimum test impedance of the air pressure value in the test impedance area, and the relationship between the frequencies corresponding to the target test impedances and the air pressure values ​​is established to determine the preset corresponding relationship, including: Fitting the frequencies corresponding to the maximum test impedance or the minimum test impedance and the air pressure values ​​to obtain fitting lines of the frequencies and the air pressure values; Based on the fitting line, the preset corresponding relationship is determined.

9. The air pressure detection method according to claim 5, characterized in that: When the air pressure in the test battery is at different pressure values, inputting a plurality of excitation signals of test frequencies to the piezoelectric device on the test battery respectively includes: The air pressure in the test battery is controlled by an air pressure control component, and the air pressure control component is connected to the test battery through a through hole opened on the test battery.

10. The air pressure detection method according to any one of claims 1 to 9, characterized in that: After determining the target impedance from the impedances corresponding to the excitation signals of different frequencies and determining the air pressure value in the battery that matches the target impedance, the air pressure detection method further includes: In response to the air pressure value in the battery being greater than or equal to a preset air pressure value, a preset alarm process is executed.

11. A battery air pressure detection device, characterized in that: include: A signal input module, used for inputting excitation signals of different frequencies to the piezoelectric devices arranged on the battery; An impedance acquisition module, used for acquiring the impedance of the piezoelectric device under the excitation signals of different frequencies; The air pressure determination module is used to determine a target impedance from the impedances corresponding to the excitation signals of different frequencies, and to determine an air pressure value in the battery that matches the target impedance.

12. A battery air pressure detection device, characterized in that: include: An impedance acquisition component, the impedance acquisition component is used to connect to the piezoelectric device arranged on the battery, and is used to input excitation signals of different frequencies to the piezoelectric device arranged on the battery, and obtain the impedance of the piezoelectric device under the excitation signals of different frequencies; A processor is connected to the impedance acquisition component and is used to determine a target impedance from the impedances corresponding to the excitation signals of different frequencies, and to determine an air pressure value in the battery that matches the target impedance.

13. An air pressure detection system, characterized in that: The air pressure detection system includes an impedance acquisition device and an electronic device that establishes a communication connection with the impedance acquisition device. The impedance acquisition device is used to connect to a piezoelectric device arranged on a battery, and is used to input excitation signals of different frequencies to the piezoelectric device arranged on the battery, and obtain the impedance of the piezoelectric device under the excitation signals of different frequencies. The electronic device is used to determine the target impedance from the impedances corresponding to the excitation signals of different frequencies, and determine the air pressure value in the battery that matches the target impedance.

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