A battery water content detection method, device, electronic equipment and storage medium

Abstract

The present application provides a battery water content detection method, device, electronic device and storage medium. The method includes: measuring and obtaining the capacitance detection value of the battery to be tested; determining the first water content value of the battery to be tested according to the capacitance detection value and the capacitance water content relationship model; wherein the capacitance water content relationship model is obtained according to the correspondence between sample batteries with different water content values ​​and their sample capacitance values. The present application pre-constructs the correspondence between the water content of the sample battery and the sample capacitance value, and determines the water content of the battery to be tested according to the correspondence and the capacitance value of the battery to be tested, thereby reducing the steps of manually cutting the electrode piece and improving the efficiency of battery water content detection.

Description

Technical Field

[0001] The present application relates to the technical field of battery detection, and in particular to a battery water content detection method, device, electronic device and storage medium. Background Art

[0002] In the existing battery production and processing process, since excessive water content in the electrode will have a significant impact on battery performance, the electrode moisture content detection process is an essential step after the battery is dried.

[0003] In the prior art, the electrode is manually taken out from the sample battery and a portion of the electrode is cut to measure the water content. This method of detecting the water content of the battery is relatively inefficient. Summary of the invention

[0004] The purpose of the embodiments of the present application is to provide a battery water content detection method, device, electronic device and storage medium to improve the efficiency of detecting battery water content.

[0005] In a first aspect, an embodiment of the present application provides a battery water content detection method, comprising: measuring and obtaining a capacitance detection value of a battery to be tested; determining a first water content value of the battery to be tested based on the capacitance detection value and a capacitance-water content relationship model; wherein the capacitance-water content relationship model is obtained based on the correspondence between sample batteries with different water content values ​​and their sample capacitance values.

[0006] The embodiment of the present application pre-constructs a correspondence between the water content of the sample battery and the sample capacitance value, and determines the water content of the battery to be tested based on the correspondence and the capacitance value of the battery to be tested, thereby reducing the step of manually cutting the electrode pieces and improving the efficiency of battery water content detection.

[0007] In any embodiment, the method further includes: obtaining the battery temperature of the battery to be tested; correcting the capacitance detection value according to the battery temperature and the temperature-capacitance relationship model to obtain a first corrected capacitance value; correspondingly, determining the first water content value of the battery to be tested according to the capacitance detection value and the capacitance-water content relationship model, including: determining the first water content value of the battery to be tested according to the first corrected capacitance value and the capacitance-water content relationship model.

[0008] The embodiment of the present application takes into account the influence of battery temperature on the capacitance detection value and uses the battery temperature to correct the capacitance detection value, thereby improving the accuracy of capacitance detection of the battery to be tested and further improving the accuracy of water content detection of the battery to be tested.

[0009] In any embodiment, the method further includes: obtaining production parameters of the battery to be tested; correcting parameters in the capacitance-water content relationship model according to the production parameters to obtain a corrected capacitance-water content relationship model; correspondingly, determining a first water content value of the battery to be tested according to the capacitance detection value and the capacitance-water content relationship model, including: determining the first water content value of the battery to be tested according to the capacitance detection value and the corrected capacitance-water content relationship model.

[0010] The embodiment of the present application takes into account the influence of production parameters on the capacitance of the battery itself, and uses the production parameters of the battery to be tested to correct the capacitance-water content relationship model, thereby improving the accuracy of capacitance detection of the battery to be tested, and further improving the accuracy of water content detection of the battery to be tested.

[0011] In any embodiment, the method further includes: obtaining the battery temperature and production parameters of the battery to be tested; correcting the capacitance detection value according to the battery temperature and the temperature-capacitance relationship model to obtain a corrected capacitance value; correcting the parameters in the capacitance-water content relationship model according to the production parameters to obtain a corrected capacitance-water content relationship model; correspondingly, determining the first water content value of the battery to be tested according to the capacitance detection value and the capacitance-water content relationship model, including: determining the first water content value of the battery to be tested according to the corrected capacitance value and the corrected capacitance-water content relationship model.

[0012] The embodiment of the present application takes into account the influence of battery temperature and production parameters on the capacitance detection value, uses the battery temperature of the battery to be tested to correct the capacitance detection value, and uses the production parameters to adjust the parameters in the capacitance-water content relationship model, thereby improving the accuracy of the capacitance detection of the battery to be tested, and further improving the accuracy of the water content detection of the battery to be tested.

[0013] In any embodiment, the method further includes: obtaining a battery temperature of the battery to be tested; correspondingly, determining a first water content value of the battery to be tested according to a capacitance detection value and a capacitance-water content relationship model, including: obtaining a capacitance-water content relationship model corresponding to the battery temperature from a model library according to the battery temperature; wherein the model library includes a plurality of capacitance-water content relationship models corresponding to the battery temperatures respectively; determining the first water content value of the battery to be tested according to the capacitance detection value and the capacitance-water content relationship model corresponding to the battery temperature.

[0014] The embodiment of the present application takes into account the influence of battery temperature on the capacitance detection value, pre-constructs a capacitor water content relationship model at different temperatures, and selects the corresponding capacitor water content relationship model according to the battery temperature, thereby improving the accuracy of water content detection of the battery to be tested.

[0015] In any embodiment, obtaining the battery temperature of the battery to be tested includes: obtaining the time when the battery to be tested is out of the oven; and determining the battery temperature of the battery to be tested according to the time when the battery to be tested is out of the oven and a time-temperature relationship function.

[0016] The embodiment of the present application determines the battery temperature of the battery to be tested by using the time the battery to be tested is out of the oven and the time-to-temperature relationship function, thereby saving a temperature detector and reducing the detection cost.

[0017] In any embodiment, the method further includes: obtaining sample batteries with different water content values; measuring the sample capacitance value and the second water content value of the sample battery; and constructing a capacitance-water content relationship model based on the sample capacitance value and the second water content value.

[0018] The embodiment of the present application pre-constructs a capacitance-water content relationship model, and determines the water content of the battery to be tested according to the capacitance-water content relationship and the capacitance value of the battery to be tested. Therefore, during the water content detection process of the battery to be tested, the water content of the battery to be tested can be obtained by detecting the capacitance value of the battery to be tested, thereby improving the detection efficiency.

[0019] In any embodiment, the sample batteries are pre-baked and placed in environments with different humidity for preset periods of time; or, the sample batteries are baked at the same temperature but for different baking periods of time.

[0020] The embodiment of the present application places the baked sample battery in different humidity environments for a preset time, so that the water content on the pole piece in the sample battery reaches a stable state, thereby obtaining a more accurate water content of the sample battery, and then providing an accurate data basis for the construction of the capacitor-water content relationship model. In addition, the embodiment of the present application obtains sample batteries with different water contents by different baking times, which conforms to the process in the battery production process and improves the efficiency of battery production.

[0021] In any embodiment, measuring and obtaining the capacitance detection value of the battery to be tested includes: after detecting that the battery to be tested reaches the detection position, controlling the detection probe to connect to the positive and negative electrodes of the battery to be tested; applying alternating current of a preset frequency to the battery to be tested through the detection probe, and measuring the capacitive reactance value of the battery to be tested; and obtaining the capacitance detection value of the battery to be tested according to the capacitive reactance value.

[0022] The embodiment of the present application detects the capacitance detection value of the battery to be tested by a constant current method, thereby avoiding the influence of the wire resistance in the loop and improving the accuracy of obtaining the capacitance detection value.

[0023] In a second aspect, an embodiment of the present application provides a battery water content detection device, including: a capacitance measurement module, used to measure and obtain a capacitance detection value of a battery to be tested; a water content calculation module, used to determine a first water content value of the battery to be tested based on the capacitance detection value and a capacitance-water content relationship model; wherein the capacitance-water content relationship model is obtained based on the correspondence between sample batteries with different water content values ​​and their sample capacitance values.

[0024] In a third aspect, an embodiment of the present application provides an electronic device, comprising: a processor, a memory and a bus, wherein the processor and the memory communicate with each other through the bus; the memory stores program instructions that can be executed by the processor, and the processor calls the program instructions to execute the method of the first aspect.

[0025] In a fourth aspect, an embodiment of the present application provides a non-transitory computer-readable storage medium, including: the non-transitory computer-readable storage medium stores computer instructions, and the computer instructions enable a computer to execute the method of the first aspect.

[0026] Other features and advantages of the present application will be described in the following description, and partly become apparent from the description, or be understood by practicing the embodiments of the present application. The purpose and other advantages of the present application can be realized and obtained by the structures specifically pointed out in the written description, claims, and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 A schematic diagram of a battery water content detection method provided in an embodiment of the present application;

[0029] Figure 2 The curve graph is obtained by fitting the second water content value and the sample capacitance value in Table 1;

[0030] Figure 3 A schematic diagram of the measurement principle provided in the embodiment of the present application;

[0031] Figure 4 A schematic flow chart of another method for detecting the water content of a battery to be tested provided in an embodiment of the present application;

[0032] Figure 5 A schematic diagram of the structure of a battery water content detection device provided in an embodiment of the present application;

[0033] Figure 6 A schematic diagram of the physical structure of an electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0034] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0035] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0036] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0037] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0038] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0039] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0040] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0041] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0042] The inventors have noticed that the water content in the battery pole piece has a great influence on the battery performance. Therefore, the water content detection of the battery pole piece is an essential step after the battery is dried. It is understandable that the water content of the battery pole piece described in the embodiment of the present application can be regarded as the water content of the battery.

[0043] The current battery water content detection method is as follows:

[0044] Step 1: Make a sample battery for water content detection, and place a sample battery for water content detection in the whole tray of batteries, and place the batteries to be baked in other positions.

[0045] Step 2: Place the entire tray of batteries in an oven for baking, and set a fixed baking time under specific pressure and temperature conditions.

[0046] Step 3: Take out the water content test sample battery, return the remaining batteries to the furnace, and wait for the test results of the water content test sample battery.

[0047] Step 4: Cut off some of the anode and cathode electrodes of the water content test sample battery, put them into the water content tester (10 minutes) (usually coulometric method), and determine whether the water content of the cathode and anode is within the specified threshold.

[0048] Step 5: When the water content meets the requirement, the battery is taken out of the oven. Otherwise, the battery continues to be baked and steps 3 to 5 are repeated.

[0049] As can be seen from the above, in the current battery water content detection method, it is necessary to manually remove the electrode from the sample battery and cut a part of the electrode for water content detection, and its detection efficiency is low; and it is necessary to wait for the results of manual measurement before continuing the production, resulting in low battery production efficiency.

[0050] In order to solve the problem of low efficiency in battery water content detection, the inventors found that a bare cell can be regarded as a plurality of parallel-plate capacitors, where the cathode and anode of the bare cell form the plates, and the air and diaphragm between the plates form the medium. The capacitance of a parallel-plate capacitor is related to the distance between the two plates of the capacitor, the area of ​​the two plates, and the dielectric constant of the medium between the plates. The specific relationship is shown in formula (1):

[0051] (1)

[0052] in, is the capacitance, is the dielectric constant of the medium between the two plates, is the area facing the two plates, is a constant, is the distance between the two plates.

[0053] For the same model of battery, under ideal conditions, the plate spacing and plate area are equal, and only the dielectric constant of the medium will change with the water content of the medium, thereby affecting the capacitance value, and the dielectric constant of the medium is positively correlated with the water content of the medium, and the capacitance is positively correlated with the dielectric constant of the medium. Under certain temperature and pressure conditions, when the water content of the medium and the water content of the pole tend to be balanced, the water content value of the medium is equal to the water content of the pole. Therefore, the capacitance value of the battery is positively correlated with the water content of the pole.

[0054] Based on the above considerations, the inventors propose that a capacitance-water content relationship model can be pre-constructed. In the subsequent water content detection process, the water content of the battery to be tested can be determined based on the capacitance detection value of the battery to be tested and the pre-constructed capacitance-water content relationship model.

[0055] The battery water content detection method described in the embodiment of the present application can be applied to the water content detection of batteries with internal capacitor structures, such as wound batteries and laminated batteries. The embodiment of the present application does not specifically limit the type of battery to be tested.

[0056] Figure 1 A schematic diagram of a battery water content detection method provided in an embodiment of the present application is shown in FIG. Figure 1 As shown, the method is applied to a detection device, which can be a smart phone, a tablet computer, a computer, a personal digital assistant (PDA), an electrochemical workstation, etc. The method includes:

[0057] Step 101: Measure and obtain the capacitance detection value of the battery to be tested.

[0058] There are many ways to obtain the capacitance detection value, for example, the capacitance detection value of the battery to be tested can be obtained by measuring it with an electrochemical workstation, by using an LRC digital bridge, or by using a multimeter with a capacitance detection function. The embodiment of the present application does not limit the specific measurement method of the capacitance detection value.

[0059] Since the water content is measured after the battery is baked during the battery production process, the battery to be tested is a baked battery.

[0060] Step 102: After measuring and obtaining the capacitance detection value, the detection device can determine the first water content value of the battery to be tested based on the capacitance detection value and the capacitance-water content relationship model; it can be understood that the capacitance-water content relationship model is obtained in advance based on the correspondence between sample batteries with different water content values ​​and the sample capacitance values ​​of each sample battery.

[0061] Among them, a plurality of sample batteries with different water content values ​​are obtained in advance, and the sample capacitance value corresponding to each sample battery is measured respectively, and the capacitance-water content relationship model is obtained according to the relationship between the water content value and the sample capacitance value of each sample battery. For example, the water content value and the sample capacitance value of the sample battery can be fitted by the least square method to obtain the capacitance-water content relationship model, which can be shown by formula (2):

[0062] (2)

[0063] in, is the water content of the sample battery, To measure the capacitance value obtained, is the slope, is the capacitance value of the non-aqueous battery.

[0064] It is understandable that the capacitance value of the sample battery can also be measured by using one of the following measurement methods: an electrochemical workstation, an LRC digital bridge, and a multimeter with a capacitance detection function.

[0065] After obtaining the capacitance detection value, the capacitance detection value is substituted into the above formula (2) to obtain the first water content value of the battery to be tested.

[0066] The embodiment of the present application utilizes the pre-constructed correspondence between the water content of the sample battery and the sample capacitance value, and determines the water content of the battery to be tested based on the correspondence and the capacitance value of the battery to be tested, thereby reducing the steps of manually cutting the electrode pieces, and can realize non-destructive online detection of the battery water content, thereby improving the efficiency of the battery water content detection and reducing manpower.

[0067] On the basis of the above embodiments, in order to overcome the influence of temperature on the capacitance of the battery to be tested, the detection device can first obtain the battery temperature of the battery to be tested; then correct the capacitance detection value according to the battery temperature and temperature-capacitance relationship model to obtain a first corrected capacitance value; after obtaining the first corrected capacitance value, determine the first water content value of the battery to be tested according to the first corrected capacitance value and the capacitance-water content relationship model. It should be noted that the detection device can be an electrochemical workstation or other terminal capable of executing the method, and the embodiments of the present application do not specifically limit this.

[0068] In the specific implementation process, it can be understood that the capacitance detection value of the battery to be tested is The capacitance value of the battery to be tested can be , the effect of temperature on capacitance Effect of water content on capacitance ,Right now , the capacitance value of the anhydrous battery can be expressed as: Therefore, the capacitance-water content relationship model can be expressed as: .in, , , are all known, so we can use Calculate the water content of the battery to be tested. For example: , , , after substituting the parameter value into the above formula, the moisture content value can be calculated .

[0069] There are many methods for obtaining the battery temperature of the battery to be tested, for example, the battery temperature of the battery to be tested can be measured by a temperature sensor; if the battery to be tested is just taken out of an oven, the temperature in the oven can be used as the battery temperature of the battery to be tested; the battery temperature can also be estimated based on the time after the battery to be tested is taken out of the oven, etc. The embodiment of the present application does not limit the method for obtaining the battery temperature.

[0070] A temperature-capacitance relationship model is constructed in advance according to different battery temperature differences and corresponding battery capacitance value differences, wherein the battery temperature difference refers to the difference in temperature with the temperature when the capacitance-water content relationship model is constructed. For example, when constructing the capacitance-water content relationship model, the battery temperature of the sample battery is 170°C, then the battery capacitance value differences corresponding to -10°C, -20°C, -30°C..., and the battery capacitance value differences corresponding to 170°C, 10°C, 20°C, 30°C..., can be obtained respectively. The above-mentioned battery temperature difference and the corresponding battery capacitance value difference are fitted to obtain a temperature-capacitance relationship model. It should be noted that the above is an example of an interval of 10°C. In actual applications, the temperature of the interval can be larger or smaller, and the interval temperature can be different. In addition, the capacitance of batteries of different models is affected differently by temperature. Therefore, batteries of different models can correspond to different temperature-capacitance relationship models. The temperature-capacitance relationship model in the embodiment of the present application is a model that matches the model of the battery to be tested. For the convenience of subsequent description, the process of constructing the capacitance-water content relationship model is called the experimental process, and the temperature of the sample battery during the experimental process is called the sample battery temperature.

[0071] After obtaining the battery temperature, since the battery temperature may be different from the temperature of the sample battery when constructing the capacitance-water content relationship model, the temperature-capacitance relationship model can be used to determine the deviation between the capacitance detection value corresponding to the battery to be tested at the current battery temperature and the sample capacitance value of the sample battery when the model is constructed, and the capacitance detection value is corrected using the deviation to obtain the first corrected capacitance value.

[0072] After obtaining the first corrected capacitance value, the first corrected capacitance value is substituted into formula (2) to calculate and obtain the first water content value of the battery to be tested.

[0073] The embodiment of the present application takes into account the influence of battery temperature on the capacitance detection value and uses the battery temperature to correct the capacitance detection value, thereby improving the accuracy of capacitance detection of the battery to be tested and further improving the accuracy of water content detection of the battery to be tested.

[0074] On the basis of the above embodiment, since the production process may produce an error in the capacitance value of the battery itself, and it can be known from formula (2) that the capacitance-water content relationship model includes the capacitance value of the anhydrous battery, that is, the capacitance value of the battery itself, therefore, in order to overcome the influence of the production parameters on the capacitance value of the battery itself, the detection device can obtain the production parameters of the battery to be tested; and correct the parameters in the capacitance-water content relationship model according to the production parameters to obtain a corrected capacitance-water content relationship model; after obtaining the corrected capacitance-water content relationship model, determine the first water content value of the battery to be tested according to the capacitance detection value and the corrected capacitance-water content relationship model.

[0075] It should be noted that the detection device may be an electrochemical workstation or other terminal capable of executing the method, and the embodiments of the present application do not specifically limit this.

[0076] In the specific implementation process, even for batteries of the same model, different production parameters may occur during the production process, such as the length and width of the battery electrode, the thickness of the electrode after cold pressing, etc. In addition, during the production process of the battery, the actual production parameters of the battery will be recorded. According to formula (1), the production parameters will affect the capacitance value of the battery itself. After obtaining the actual production parameters of the battery to be tested, the capacitance value of the anhydrous battery can be calculated according to formula (1), and then the capacitance value of the anhydrous battery can be used to replace the capacitance-water content relationship model. , obtain a revised capacitance-water content relationship model. Then input the capacitance detection value into the revised capacitance-water content relationship model to obtain a first water content value of the battery to be tested.

[0077] In the embodiment of the present application, since the capacitance value of the anhydrous battery in the pre-constructed capacitance-water content relationship model is obtained by fitting and is a fixed value, in order to improve the accuracy of obtaining the first water content value, the capacitance value of the anhydrous battery can be recalculated using the production parameters of the battery to be tested, and the capacitance-water content relationship model is optimized using the recalculated capacitance value of the anhydrous battery, thereby achieving the purpose of improving the accuracy of obtaining the first water content value.

[0078] On the basis of the above embodiments, the inventors have found that both battery temperature and production parameters have an impact on the measurement of battery water content. Therefore, the detection device can obtain the battery temperature and production parameters of the battery to be tested; wherein the battery temperature is used to correct the capacitance detection value, and the production parameters are used to correct the parameters in the capacitance-water content relationship model. For example: the capacitance detection value is corrected according to the battery temperature and the temperature-capacitance relationship model to obtain a corrected capacitance value; the parameters in the capacitance-water content relationship model are corrected according to the production parameters to obtain a corrected capacitance-water content relationship model; after obtaining the corrected capacitance value and the corrected capacitance-water content relationship model, the first water content value of the battery to be tested is determined according to the corrected capacitance value and the corrected capacitance-water content relationship model.

[0079] It is understandable that the detection device may be an electrochemical workstation or other terminal capable of executing the above method, and the embodiments of the present application do not specifically limit the detection device.

[0080] In the specific implementation process, the acquisition of the battery temperature and production parameters of the battery to be tested can refer to the acquisition method of the above embodiment, and the acquisition of the corrected capacitance value and the corrected capacitance-water content relationship model can also refer to the above embodiment, which will not be repeated here.

[0081] After obtaining the corrected capacitance value and the corrected capacitance-water content relationship model, the corrected capacitance value is input into the corrected capacitance-water content relationship model to obtain a first water content value.

[0082] The embodiment of the present application takes into account the influence of battery temperature and production parameters on the capacitance detection value, uses the battery temperature of the battery to be tested to correct the capacitance detection value, and uses the production parameters to adjust the parameters in the capacitance-water content relationship model, thereby improving the accuracy of the capacitance detection of the battery to be tested, and further improving the accuracy of the water content detection of the battery to be tested.

[0083] On the basis of the above embodiment, the detection device can pre-construct capacitor-water content relationship models corresponding to different battery temperatures to form a model library. After obtaining the battery temperature of the battery to be tested, the detection device obtains the capacitor-water content relationship model corresponding to the battery temperature from the model library, and determines the first water content value of the battery to be tested according to the capacitance detection value and the obtained capacitor-water content relationship model.

[0084] It should be noted that the detection device may be an electrochemical workstation or other terminal capable of executing the method, and the embodiments of the present application do not specifically limit this.

[0085] Among them, the sample capacitance value and water content of the sample battery at different temperatures are obtained, the relationship between the sample capacitance value and the water content is constructed, and the capacitance-water content relationship model at different temperatures is obtained, that is: , generate a model library.

[0086] After obtaining the battery temperature of the battery to be tested, a capacitor-water content relationship model matching the battery temperature is obtained from the model library. It should be noted that if the sample battery temperature corresponding to the capacitor-water content relationship model in the model library is not equal to the battery temperature, the capacitor-water content relationship model corresponding to the sample battery temperature closest to the battery temperature is selected, and the capacitance detection value is input into the capacitor-water content relationship model to obtain the first water content value.

[0087] The embodiment of the present application takes into account the influence of battery temperature on the capacitance detection value, pre-constructs a capacitor water content relationship model at different temperatures, and selects the corresponding capacitor water content relationship model according to the battery temperature, thereby improving the accuracy of water content detection of the battery to be tested.

[0088] Based on the above embodiment, the step of obtaining the battery temperature of the battery to be tested may include:

[0089] The detection device obtains the time of the battery to be tested being taken out of the furnace, and determines the battery temperature of the battery to be tested corresponding to the time of taking out of the furnace using the time-temperature relationship function. It should be noted that the detection device can be an electrochemical workstation or other terminal capable of executing the method, and the embodiment of the present application does not specifically limit this.

[0090] In a specific implementation process, the battery temperature of the battery to be tested can be obtained by measuring with a temperature sensor or by predicting the battery temperature based on the time it takes the battery to be tested to be produced.

[0091] The out-of-oven time refers to the time from when the battery to be tested is taken out of the oven to when the capacitance value of the battery to be tested is measured.

[0092] The time-temperature relationship function is obtained by measuring the temperature of the sample battery at regular intervals starting from the temperature in the oven, and fitting the time taken for the sample battery to the temperature of the sample battery. When obtaining the time-temperature relationship function, the temperature in the oven is the same as the oven temperature when the battery to be tested is baked.

[0093] After the out-of-battery time is obtained, the out-of-battery time is substituted into the time-temperature relationship function to calculate and obtain the battery temperature of the battery to be tested.

[0094] The embodiment of the present application determines the battery temperature of the battery to be tested by using the time the battery to be tested is out of the oven and the time-to-temperature relationship function, thereby saving a temperature detector and reducing the detection cost.

[0095] Based on the above embodiment, a capacitor-water content relationship model can be constructed through the following steps:

[0096] The detection device obtains sample batteries with different water content values; and measures the sample capacitance value and the second water content value of each sample battery; then, a capacitance-water content relationship model is constructed according to the measured sample capacitance value and the second water content value. It should be noted that the detection device can be an electrochemical workstation or other terminal capable of executing the method, and the embodiments of the present application do not specifically limit this.

[0097] In the specific implementation process, the sample batteries with different water content values ​​are batteries of the same model. After obtaining the sample batteries with different water content values, the sample capacitance value of each sample battery can be measured by an electrochemical workstation, and the second water content value on the battery electrode of the sample battery can be measured using a Karl Fischer moisture analyzer.

[0098] And according to the sample capacitance value of each sample battery and the corresponding second water content value, the values ​​in Table 1 and Figure 2 ,in, Figure 2 The second water content value and the sample capacitance value in Table 1 are fitted to obtain the value. It can be understood that the least square method can be used for fitting.

[0099] Table 1

[0100]

[0101] When measuring the sample capacitance value of a sample battery using an electrochemical workstation, the capacitive reactance value of the sample battery can be measured first, and then the sample capacitance value of the sample battery can be calculated using formula (3).

[0102] (3)

[0103] in, is the sample capacitance value, is the angular velocity; is the capacitive reactance of the sample battery, is the frequency.

[0104] It is understandable that the capacitance detection value of the battery to be tested can also be calculated and obtained by the above calculation method.

[0105] The embodiment of the present application pre-constructs a capacitance-water content relationship model, and determines the water content of the battery to be tested according to the capacitance-water content relationship and the capacitance value of the battery to be tested. Therefore, during the water content detection process of the battery to be tested, the water content of the battery to be tested can be obtained by detecting the capacitance value of the battery to be tested, thereby improving the detection efficiency.

[0106] Based on the above embodiment, the sample batteries are baked in advance and placed in environments with different humidity for preset periods of time.

[0107] In the specific implementation process, a preset number of sample batteries of the same model after baking are screened, for example, 30 batteries, numbered 1-30, and sample battery 1 is measured and calculated using an electrochemical workstation to obtain its sample capacitance value. Then, a Karl Fischer moisture analyzer is used to measure the second water content value of its battery electrode to obtain the sample capacitance value C1 corresponding to the second water content value S1.

[0108] Then place sample battery No. 2-30 in a constant temperature and humidity test box with a humidity of 5% for a long enough time to ensure that the internal water content of the sample battery is stable, then take out sample battery 2 and perform the following test: Use the electrochemical workstation to measure and calculate the sample capacitance value C2 of sample battery 2, and then use the Karl Fischer moisture analyzer to measure the second water content value S2 of its battery electrode.

[0109] Then, after the test box reaches the target humidity for a certain period of time, the sample batteries 3-30 are taken out in sequence, and the above test steps are repeated to obtain the sample capacitance values ​​and the second water content values ​​corresponding to the sample batteries with different water content values.

[0110] It should be noted that the humidity value can be set comprehensively based on the humidity range of the test chamber, the number of sample batteries, the Karl Fischer moisture analyzer and manual measurement errors. For example, the effect of the humidity difference between two adjacent groups of experimental batteries on the water content of the batteries needs to be much greater than the sum of the instrument measurement error of the Karl Fischer moisture analyzer and the error caused by humans.

[0111] The embodiment of the present application places the baked sample batteries in different humidity environments for a preset period of time so that the water content on the electrodes in the sample batteries reaches a stable state, thereby obtaining a more accurate water content of the sample batteries, and further providing accurate data basis for the construction of a capacitor-water content relationship model.

[0112] In another embodiment, the sample batteries are obtained by baking at the same temperature but for different baking times.

[0113] In the specific implementation process, a preset number of unbaked sample batteries of the same model are obtained, for example 30, numbered 31-60, and sample battery 31 is taken out. After its capacitance value is measured and calculated using an electrochemical workstation, the water content of the battery electrode of sample battery 31 is measured using a Karl Fischer moisture analyzer to obtain a second capacitance value C31 corresponding to the sample water content S31.

[0114] The sample batteries numbered 32-60 are placed in an oven and baked for a preset time, for example, 5 minutes. The sample battery 32 is taken out of the oven, and its second capacitance value C32 is measured and calculated using an electrochemical workstation. Then, the sample water content value S32 of the battery electrode is measured using a Karl Fischer moisture analyzer.

[0115] Then continue to bake the sample batteries numbered 33-60, take out a sample battery from the oven every preset time, and measure the second capacitance value and sample water content of the sample battery. Figure 2 Similarly, the second capacitance value and the water content of the sample are fitted to obtain a curve graph showing the change of capacitance value with water content.

[0116] The embodiment of the present application obtains sample batteries with different water contents by different baking times, which complies with the process of battery production and improves the efficiency of battery production.

[0117] Based on the above embodiment, the step of measuring the capacitance detection value of the battery to be tested includes:

[0118] After the detection device detects that the battery to be tested has reached the detection position, the detection probe is controlled to connect to the positive and negative electrodes of the battery to be tested to form a circuit; a constant voltage alternating current is applied to the battery to be tested through the detection probe, and the capacitive reactance value of the battery to be tested is measured; after the capacitive reactance value is obtained, the capacitance detection value of the battery to be tested is obtained according to the capacitive reactance value. It is understandable that the detection device can be an electrochemical workstation, and of course it can also be other terminals capable of running the method, and the embodiments of the present application do not specifically limit this.

[0119] In the specific implementation process, a movable probe mechanism is arranged on the unloading pull belt after the battery is baked. When the battery to be tested is blocked in place, the detection device controls the probe mechanism to descend, and the detection probe on the probe mechanism contacts the positive and negative electrodes of the battery to be tested. Figure 3 The measurement principle diagram provided in the embodiment of the present application is as follows: Figure 3 As shown, the measuring instrument can be an electrochemical workstation, R1 is the internal resistance of the battery to be tested, C is the capacitance formed by the electrode of the battery to be tested, and R2 is the wire resistance. The electrochemical workstation starts working, and a constant voltage alternating current is applied to the positive and negative electrodes of the battery to be tested through the detection probe, 100Hz-10000Hz, and the excitation voltage amplitude is 0.0001v-10v; for example: the frequency can be 1000HZ, and the excitation voltage amplitude is 0.01 volt (V). The electrochemical workstation measures the capacitive reactance value of the battery to be tested, and then calculates the capacitance detection value of the battery to be tested based on the capacitive reactance value.

[0120] It is understandable that a constant current alternating current with a frequency range of 100 Hz-10000 Hz and an excitation voltage amplitude of 0.001 A-1 A can also be applied to the battery to be tested through the detection probe, for example: an alternating current with a frequency of 1000 Hz and an amplitude of 0.1 A.

[0121] The embodiment of the present application detects the capacitance detection value of the battery to be tested by a constant current method, thereby avoiding the influence of the wire resistance in the loop and improving the accuracy of obtaining the capacitance detection value.

[0122] Figure 4 A schematic flow chart of another method for detecting the water content of a battery to be tested provided in an embodiment of the present application is shown in FIG. Figure 4 As shown, the method is described by taking the water content test of the battery after high temperature baking as an example, and includes:

[0123] Step 401: The detection device detects that the battery to be tested reaches the detection position;

[0124] Step 402: The detection device controls the detection probe to descend so that the detection probe contacts the two electrodes of the battery to be tested;

[0125] Step 403: The detection device includes a temperature sensor, and the battery temperature data is obtained through the temperature sensor;

[0126] Step 404: short-circuit the positive and negative electrodes of the battery to be tested so that the open circuit voltage of the battery is zero;

[0127] Step 405: The detection device measures the capacitive reactance value of the battery to be tested, and calculates the corresponding capacitance detection value according to the capacitive reactance value. Specifically, the capacitance detection value can be calculated according to formula (3), and then the first water content can be calculated according to formula (1).

[0128] Step 406: The detection device determines whether the first water content is less than the standard value, and if so, executes step 407, otherwise, executes step 408.

[0129] Step 407: The battery is produced normally;

[0130] Step 408: bad products are discharged.

[0131] Figure 5 This is a schematic diagram of a battery water content detection device provided in an embodiment of the present application. The device may be a module, program segment or code on an electronic device. It should be understood that the device is similar to the above-mentioned Figure 1 The method embodiment corresponds to and can be executed Figure 1 The various steps involved in the method embodiment and the specific functions of the device can be found in the above description. To avoid repetition, detailed description is appropriately omitted here. The device includes: a capacitance measurement module 501 and a water content calculation module 502, wherein:

[0132] The capacitance measurement module 501 is used to measure and obtain the capacitance detection value of the battery to be tested; the water content calculation module 502 is used to determine the first water content value of the battery to be tested according to the capacitance detection value and the capacitance-water content relationship model; wherein the capacitance-water content relationship model is obtained according to the correspondence between sample batteries with different water content values ​​and their sample capacitance values.

[0133] Based on the above embodiment, the device further includes:

[0134] A temperature acquisition module is used to acquire the battery temperature of the battery to be tested; wherein the purpose of acquiring the battery temperature is to correct the capacitance detection value;

[0135] The first correction module is used to correct the capacitance detection value according to the acquired battery temperature and the pre-built temperature-capacitance relationship model to obtain a first corrected capacitance value; correspondingly,

[0136] The water content calculation module 502 is specifically used for:

[0137] The first water content value of the battery to be tested is determined according to the first corrected capacitance value and the capacitance water content relationship model.

[0138] Based on the above embodiment, the device further includes:

[0139] The parameter acquisition module is also used to obtain the production parameters of the battery to be tested; wherein the purpose of obtaining the production parameters is to correct the parameters in the capacitance-water content relationship model;

[0140] The second correction module is used to correct the parameters in the capacitance-water content relationship model according to the obtained production parameters of the battery to be tested, so as to obtain the corrected capacitance-water content relationship model; accordingly,

[0141] The water content calculation module 502 is specifically used for:

[0142] A first water content value of the battery to be tested is determined according to the capacitance detection value and the corrected capacitance-water content relationship model.

[0143] Based on the above embodiment, the device further includes:

[0144] A temperature acquisition module is used to obtain the battery temperature and production parameters of the battery to be tested; wherein the battery temperature is used to correct the capacitance detection value, and the production parameters are used to correct the parameters in the capacitance-water content relationship model;

[0145] The third correction module is used to correct the capacitance detection value according to the battery temperature and the temperature-capacitance relationship model to obtain the corrected capacitance value; correct the parameters in the capacitance-water content relationship model according to the production parameters to obtain the corrected capacitance-water content relationship model; accordingly,

[0146] The water content calculation module 502 is specifically used for:

[0147] The first water content value of the battery to be tested is determined according to the corrected capacitance value and the corrected capacitance-water content relationship model.

[0148] Based on the above embodiment, the device further includes:

[0149] The temperature acquisition module is used to obtain the battery temperature of the battery to be tested; accordingly,

[0150] The water content calculation module 502 is specifically used for:

[0151] Obtaining a capacitor-water content relationship model corresponding to the battery temperature from a model library according to the battery temperature; wherein the model library includes a plurality of capacitor-water content relationship models corresponding to the battery temperatures respectively;

[0152] The first water content value of the battery to be tested is determined according to a capacitance detection value and a capacitance-water content relationship model corresponding to the battery temperature.

[0153] Based on the above embodiment, the temperature acquisition module is specifically used for:

[0154] Get the time of the battery under test being produced;

[0155] The battery temperature of the battery to be tested is determined according to the time taken out of the oven and the time-temperature relationship function.

[0156] Based on the above embodiment, the device further includes:

[0157] A battery acquisition module, used to obtain sample batteries with different water content values;

[0158] A measuring module, used for measuring a sample capacitance value and a second water content value of a sample battery;

[0159] The model building module is used to build a capacitance-water content relationship model according to the sample capacitance value and the second water content value.

[0160] Based on the above embodiment, the sample batteries are baked in advance and placed in environments with different humidity for a preset time; or,

[0161] The sample batteries were obtained by baking at the same temperature and different baking times.

[0162] Based on the above embodiment, the capacitance measurement module is specifically used for:

[0163] After detecting that the battery to be tested arrives at the testing position, controlling the testing probe to be connected to the positive and negative electrodes of the battery to be tested;

[0164] Applying a constant voltage alternating current to the battery under test through a detection probe, and measuring the capacitive reactance value of the battery under test;

[0165] The capacitance detection value of the battery to be tested is obtained according to the capacitive reactance value.

[0166] Figure 6 A schematic diagram of the physical structure of an electronic device provided in an embodiment of the present application, such as Figure 6 As shown, the electronic device includes: a processor (processor) 601, a memory (memory) 602 and a bus 603; wherein,

[0167] The processor 601 and the memory 602 communicate with each other via the bus 603;

[0168] The processor 601 is used to call the program instructions in the memory 602 to execute the methods provided by the above-mentioned method embodiments, for example, including: measuring and obtaining the capacitance detection value of the battery to be tested; determining the first water content value of the battery to be tested according to the capacitance detection value and the capacitance-water content relationship model; wherein the capacitance-water content relationship model is obtained according to the correspondence between sample batteries with different water content values ​​and their sample capacitance values.

[0169] The processor 601 may be an integrated circuit chip with signal processing capabilities. The processor 601 may be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), etc.; it may also be 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. It may implement or execute various methods, steps and logic block diagrams disclosed in the embodiments of the present application. A general-purpose processor may be a microprocessor or the processor may also be any conventional processor, etc.

[0170] The memory 602 may include, but is not limited to, random access memory (RAM), read only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), etc.

[0171] The present embodiment discloses a computer program product, which includes a computer program stored on a non-transitory computer-readable storage medium, and the computer program includes program instructions. When the program instructions are executed by a computer, the computer can execute the methods provided by the above-mentioned method embodiments, for example, including: measuring and obtaining a capacitance detection value of a battery to be tested; determining a first water content value of the battery to be tested according to a capacitance detection value and a capacitance-water content relationship model; wherein the capacitance-water content relationship model is obtained according to the correspondence between sample batteries with different water content values ​​and their sample capacitance values.

[0172] The present embodiment provides a non-transitory computer-readable storage medium, which stores computer instructions, and the computer instructions enable the computer to execute the methods provided by the above-mentioned method embodiments, for example, including: measuring and obtaining a capacitance detection value of a battery to be tested; determining a first water content value of the battery to be tested according to a capacitance detection value and a capacitance-water content relationship model; wherein the capacitance-water content relationship model is obtained according to the correspondence between sample batteries with different water content values ​​and their sample capacitance values.

[0173] In the embodiments provided in the present application, it should be understood that the disclosed devices and methods can be implemented in other ways. The device embodiments described above are merely schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some communication interfaces, and the indirect coupling or communication connection of the devices or units can be electrical, mechanical or other forms.

[0174] In addition, the units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0175] Furthermore, the functional modules in the various embodiments of the present application may be integrated together to form an independent part, or each module may exist separately, or two or more modules may be integrated to form an independent part.

[0176] In this document, relational terms such as first and second, etc. are used merely to distinguish one entity or operation from another entity or operation, but do not necessarily require or imply any such actual relationship or order between these entities or operations.

[0177] The above description is only an embodiment of the present application and is not intended to limit the protection scope of the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A method for detecting water content in a battery, characterized in that: include: Measure and obtain the capacitance detection value of the battery to be tested; Determine a first water content value of the battery to be tested according to the capacitance detection value and the capacitance-water content relationship model; wherein the capacitance-water content relationship model is obtained according to the correspondence between sample batteries with different water content values ​​and their sample capacitance values; The measuring step of obtaining the capacitance detection value of the battery to be tested includes: After detecting that the battery to be tested arrives at the testing position, controlling the testing probe to be connected to the positive and negative electrodes of the battery to be tested; Applying an alternating current with a constant voltage to the battery to be tested through the detection probe, and measuring the capacitive reactance value of the battery to be tested; The capacitance detection value of the battery to be tested is obtained according to the capacitive reactance value.

2. The method according to claim 1, characterized in that The method further comprises: Acquiring the battery temperature of the battery to be tested; The capacitance detection value is corrected according to the battery temperature and temperature-capacitance relationship model to obtain a corrected capacitance value; accordingly, The determining the first water content value of the battery to be tested according to the capacitance detection value and the capacitance-water content relationship model comprises: The first water content value of the battery to be tested is determined according to the corrected capacitance value and the capacitance-water content relationship model.

3. The method according to claim 1, characterized in that The method further comprises: Obtaining production parameters of the battery to be tested; The parameters in the capacitance-water content relationship model are modified according to the production parameters to obtain a modified capacitance-water content relationship model; accordingly, The determining the first water content value of the battery to be tested according to the capacitance detection value and the capacitance-water content relationship model comprises: A first water content value of the battery to be tested is determined according to the capacitance detection value and the corrected capacitance-water content relationship model.

4. The method according to claim 1, characterized in that: The method further comprises: Obtaining battery temperature and production parameters of the battery to be tested; Correcting the capacitance detection value according to the battery temperature and temperature-capacitance relationship model to obtain a corrected capacitance value; The parameters in the capacitance-water content relationship model are modified according to the production parameters to obtain a modified capacitance-water content relationship model; accordingly, The determining the first water content value of the battery to be tested according to the capacitance detection value and the capacitance-water content relationship model comprises: A first water content value of the battery to be tested is determined according to the corrected capacitance value and the corrected capacitance-water content relationship model.

5. The method according to claim 1, characterized in that The method further comprises: Obtaining the battery temperature of the battery to be tested; correspondingly, The determining the first water content value of the battery to be tested according to the capacitance detection value and the capacitance-water content relationship model comprises: Acquire a capacitor-water content relationship model corresponding to the battery temperature from a model library according to the battery temperature; wherein the model library includes a plurality of capacitor-water content relationship models corresponding to the battery temperatures respectively; A first water content value of the battery to be tested is determined according to a capacitance detection value and a capacitance-water content relationship model corresponding to the battery temperature.

6. The method according to claim 2, 4 or 5, characterized in that: The obtaining the battery temperature of the battery to be tested includes: Obtaining the time of the battery under test being produced; The battery temperature of the battery to be tested is determined according to the out-of-battery time and the time-temperature relationship function.

7. The method according to claim 1, characterized in that The method further comprises: Obtain sample cells with different water content values; measuring the sample capacitance value and the second water content value of the sample battery; The capacitance-water content relationship model is constructed according to the sample capacitance value and the second water content value.

8. The method according to claim 7, characterized in that The sample batteries are pre-baked and placed in environments with different humidity for a preset period of time; or, The sample batteries are obtained by baking at the same temperature and for different baking times.

9. A battery water content detection device, characterized in that: include: A capacitance measurement module is used to measure and obtain the capacitance detection value of the battery to be tested; A water content calculation module, used to determine a first water content value of the battery to be tested according to the capacitance detection value and a capacitance-water content relationship model; wherein the capacitance-water content relationship model is obtained according to the correspondence between sample batteries with different water content values ​​and their sample capacitance values; The capacitance measurement module is specifically used for: After detecting that the battery to be tested arrives at the testing position, controlling the testing probe to be connected to the positive and negative electrodes of the battery to be tested; Applying an alternating current with a constant voltage to the battery to be tested through the detection probe, and measuring the capacitive reactance value of the battery to be tested; The capacitance detection value of the battery to be tested is obtained according to the capacitive reactance value.

10. The device according to claim 9, characterized in that The device also includes: A temperature acquisition module, used to acquire the battery temperature of the battery to be tested; The first correction module is used to correct the capacitance detection value according to the battery temperature and temperature-capacitance relationship model to obtain a corrected capacitance value; correspondingly, The water content calculation module is specifically used for: The first water content value of the battery to be tested is determined according to the corrected capacitance value and the capacitance-water content relationship model.

11. The device according to claim 9, characterized in that The device also includes: A parameter acquisition module, used to acquire the production parameters of the battery to be tested; The second correction module is used to correct the parameters in the capacitor-water content relationship model according to the production parameters to obtain a corrected capacitor-water content relationship model; correspondingly, The water content calculation module is specifically used for: A first water content value of the battery to be tested is determined according to the capacitance detection value and the corrected capacitance-water content relationship model.

12. The device according to claim 9, characterized in that The device also includes: A temperature acquisition module, used to acquire the battery temperature of the battery to be tested; A parameter acquisition module, used to acquire the production parameters of the battery to be tested; A first correction module, used for correcting the capacitance detection value according to the battery temperature and the temperature-capacitance relationship model to obtain a corrected capacitance value; The second correction model is used to correct the parameters in the capacitance-water content relationship model according to the production parameters to obtain a corrected capacitance-water content relationship model; correspondingly, The water content calculation module is specifically used for: A first water content value of the battery to be tested is determined according to the corrected capacitance value and the corrected capacitance-water content relationship model.

13. The device according to claim 9, characterized in that The device also includes: The temperature acquisition module is used to acquire the battery temperature of the battery to be tested; accordingly, The water content calculation module is specifically used for: Acquire a capacitor-water content relationship model corresponding to the battery temperature from a model library according to the battery temperature; wherein the model library includes a plurality of capacitor-water content relationship models corresponding to the battery temperatures respectively; A first water content value of the battery to be tested is determined according to a capacitance detection value and a capacitance-water content relationship model corresponding to the battery temperature.

14. The device according to claim 10, 12 or 13, characterized in that The temperature acquisition module is specifically used for: Obtaining the time of the battery under test being produced; The battery temperature of the battery to be tested is determined according to the out-of-battery time and the time-temperature relationship function.

15. The device according to claim 9, characterized in that The device also includes: A battery acquisition module, used to obtain sample batteries with different water content values; A measuring module, used for measuring the sample capacitance value and the second water content value of the sample battery; A model building module is used to build the capacitance-water content relationship model according to the sample capacitance value and the second water content value.

16. The device according to claim 15, characterized in that The sample batteries are pre-baked and placed in environments with different humidity for a preset period of time; or, The sample batteries are obtained by baking at the same temperature and for different baking times.

17. An electronic device, characterized in that: include: processor, memory and bus, wherein, The processor and the memory communicate with each other via the bus; The memory stores program instructions executable by the processor, and the processor can execute the method according to any one of claims 1 to 8 by calling the program instructions.

18. A non-transitory computer-readable storage medium, characterized in that: The non-transitory computer-readable storage medium stores computer instructions, which, when executed by a computer, cause the computer to perform the method according to any one of claims 1 to 8.

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