Method and device for testing capacitance of heating appliance and computer equipment

Abstract

The invention relates to a capacitance testing method and device of a heating appliance, computer equipment, a computer readable storage medium and a computer program product. The method comprises the following steps: determining a plurality of constant-temperature time periods of a heating body in a heating process; determining a first output current of the battery cell according to the charging voltage of the battery cell and the normal-temperature resistance of the heating body; for each second time period except the first time period in the plurality of constant-temperature time periods, acquiring a resistance temperature coefficient of the heating body in the second time period; according to the charging voltage, the normal-temperature resistance and the resistance temperature coefficient of the heating body in the second time period, the second output current of the battery cell is determined, and the second output current is the current value of discharging of the battery cell in the second time period; and determining the actual capacitance of the battery cell according to the discharge voltage of the battery cell, the first output current and each second output current. By adopting the method, the electric capacity of the battery cell can be accurately tested.

Description

Technical Field

[0001] The present application relates to the field of computer technology, and in particular to a method and apparatus for testing the capacitance of a heating device, a computer device, a computer-readable storage medium, and a computer program product. Background Art

[0002] HNB devices are special devices for "heated not burned" tobacco products. HNB devices heat specially made tobacco sticks or cartridges instead of burning them. This reduces harmful byproducts produced during the combustion process, such as tar and carbon monoxide. As a key component in HNB devices, the battery cell is responsible for providing the electricity required for heating. As a mass-produced component, the battery cell has certain individual differences.

[0003] Currently, the test of battery cell capacitance is mainly based on international standards. However, HNB devices have both large and relatively small currents during use. It is difficult to simulate the actual use of HNB devices according to the standards, resulting in lax control and failure to screen out non-compliant battery cells. It is impossible to prevent battery cells with poor performance or safety hazards from entering the market, thereby reducing the overall quality and reliability of the product. Summary of the invention

[0004] Based on this, it is necessary to provide a capacitance testing method, device, computer equipment, computer-readable storage medium and computer program product for a heating device that can make the capacitance test result of the heating device more accurate in order to address the above technical problems.

[0005] In a first aspect, the present application provides a method for testing the capacitance of a heating device, comprising:

[0006] Determining a plurality of constant temperature time periods of the heating element during the heating process;

[0007] Determine a first output current of the battery cell according to the charging voltage of the battery cell and the constant temperature resistance of the heating element, wherein the first output current is a current value of the battery cell being discharged in a first time period among the multiple constant temperature time periods;

[0008] For each second time period except the first time period in the plurality of constant temperature time periods, obtaining a resistance temperature coefficient of the heating element in the second time period;

[0009] Determine a second output current of the battery cell according to the charging voltage, the normal temperature resistance and the resistance temperature coefficient of the heating element in the second time period, wherein the second output current is a current value of the battery cell when discharging in the second time period;

[0010] The actual capacity of the battery cell is determined according to the discharge voltage of the battery cell, the first output current and each of the second output currents.

[0011] In one embodiment, before determining the first output current of the battery cell according to the charging voltage of the battery cell and the normal temperature resistance of the heating element, the method further includes:

[0012] The charging time of the battery cell is determined according to the charging current of the battery cell, the room temperature resistance of the heating element and the charging voltage of the battery cell. The charging time is the time taken for the battery cell to be charged with the charging current until the voltage of the battery cell reaches the charging voltage.

[0013] In one embodiment, determining the second output current of the battery cell according to the charging voltage, the normal temperature resistance and the resistance temperature coefficient of the heating element in the second time period includes:

[0014] Determining a target temperature difference according to the normal temperature of the heating element and the constant temperature corresponding to the second time period;

[0015] determining the actual resistance of the heating element in the second time period according to the target temperature difference, the resistance temperature coefficient and the room temperature resistance of the heating element;

[0016] The ratio between the actual resistance of the heating element and the charging voltage is determined, and the ratio is used as the second output current of the battery cell.

[0017] In one embodiment, determining the actual resistance of the heating element in the second time period according to the target temperature difference, the resistance temperature coefficient and the room temperature resistance of the heating element includes:

[0018] Determine the product value of the target temperature difference, the resistance temperature coefficient, and the room temperature resistance of the heating element;

[0019] The actual resistance of the heating element in the second time period is obtained by summing the product of the target temperature difference, the resistance temperature coefficient, the room-temperature resistance of the heating element, and the room-temperature resistance of the heating element.

[0020] In one embodiment, determining the actual capacity of the battery cell according to the discharge voltage of the battery cell, the first output current and each of the second output currents includes:

[0021] Determining a first capacity of the battery cell according to a discharge voltage of the battery cell and the first output current;

[0022] determining a second capacity of the battery cell according to a discharge voltage of the battery cell and each of the second output currents;

[0023] The average capacitance of the first capacitance and the second capacitance is used as the actual capacitance of the battery cell.

[0024] In one embodiment, determining the first capacity of the battery cell according to the discharge voltage of the battery cell and the first output current includes:

[0025] Acquire a discharge end condition, wherein the discharge end condition includes discharging until a first preset time period ends or discharging until an actual voltage of the battery cell is less than a discharge voltage ends;

[0026] In the process of discharging the battery cell with the first output current, if the discharge ends when the first preset time in the discharge end condition is reached first, the product value of the first output current and the first preset time is used as the first capacitance of the battery cell;

[0027] If the discharge end condition in which the actual voltage of the battery cell is less than the discharge voltage is reached first, the discharge time when the actual voltage of the battery cell is less than the discharge voltage is obtained, and the product of the discharge time and the first output current is used as the first capacitance of the battery cell.

[0028] In a second aspect, the present application also provides a capacitance testing device for a heating device, comprising:

[0029] A first determination module is used to determine a plurality of constant temperature time periods of the heating element during the heating process;

[0030] A second determination module is used to determine a first output current of the battery cell according to the charging voltage of the battery cell and the constant temperature resistance of the heating element, wherein the first output current is a current value of the battery cell being discharged in a first time period among the multiple constant temperature time periods;

[0031] An acquisition module, for acquiring, for each second time period other than the first time period in the plurality of constant temperature time periods, a resistance temperature coefficient of the heating element in the second time period;

[0032] A third determination module is used to determine a second output current of the battery cell according to the charging voltage, the normal temperature resistance and the resistance temperature coefficient of the heating element in the second time period, wherein the second output current is a current value of the battery cell being discharged in the second time period;

[0033] The fourth determination module is used to determine the actual capacity of the battery cell according to the discharge voltage of the battery cell, the first output current and each of the second output currents.

[0034] In a third aspect, the present application further provides a computer device, including a memory and a processor, wherein the memory stores a computer program, and when the processor executes the computer program, the following steps are implemented:

[0035] Determining a plurality of constant temperature time periods of the heating element during the heating process;

[0036] Determine a first output current of the battery cell according to the charging voltage of the battery cell and the constant temperature resistance of the heating element, wherein the first output current is a current value of the battery cell being discharged in a first time period among the multiple constant temperature time periods;

[0037] For each second time period except the first time period in the plurality of constant temperature time periods, obtaining a resistance temperature coefficient of the heating element in the second time period;

[0038] Determine a second output current of the battery cell according to the charging voltage, the normal temperature resistance and the resistance temperature coefficient of the heating element in the second time period, wherein the second output current is a current value of the battery cell when discharging in the second time period;

[0039] The actual capacity of the battery cell is determined according to the discharge voltage of the battery cell, the first output current and each of the second output currents.

[0040] In a fourth aspect, the present application further provides a computer-readable storage medium having a computer program stored thereon, wherein when the computer program is executed by a processor, the following steps are implemented:

[0041] Determining a plurality of constant temperature time periods of the heating element during the heating process;

[0042] Determine a first output current of the battery cell according to the charging voltage of the battery cell and the constant temperature resistance of the heating element, wherein the first output current is a current value of the battery cell being discharged in a first time period among the multiple constant temperature time periods;

[0043] For each second time period except the first time period in the plurality of constant temperature time periods, obtaining a resistance temperature coefficient of the heating element in the second time period;

[0044] Determine a second output current of the battery cell according to the charging voltage, the normal temperature resistance and the resistance temperature coefficient of the heating element in the second time period, wherein the second output current is a current value of the battery cell when discharging in the second time period;

[0045] The actual capacity of the battery cell is determined according to the discharge voltage of the battery cell, the first output current and each of the second output currents.

[0046] In a fifth aspect, the present application further provides a computer program product, including a computer program, which implements the following steps when executed by a processor:

[0047] Determining a plurality of constant temperature time periods of the heating element during the heating process;

[0048] Determine a first output current of the battery cell according to the charging voltage of the battery cell and the constant temperature resistance of the heating element, wherein the first output current is a current value of the battery cell being discharged in a first time period among the multiple constant temperature time periods;

[0049] For each second time period except the first time period in the plurality of constant temperature time periods, obtaining a resistance temperature coefficient of the heating element in the second time period;

[0050] Determine a second output current of the battery cell according to the charging voltage, the normal temperature resistance and the resistance temperature coefficient of the heating element in the second time period, wherein the second output current is a current value of the battery cell when discharging in the second time period;

[0051] The actual capacity of the battery cell is determined according to the discharge voltage of the battery cell, the first output current and each of the second output currents.

[0052] The above-mentioned capacitance test method, device, computer equipment, computer-readable storage medium and computer program product of the heating device, by determining multiple constant temperature time periods of the heating element during the heating process; identify the stable stages in the heating process, which are crucial for understanding the behavior of the battery cell under actual use conditions. According to the charging voltage of the battery cell and the room temperature resistance of the heating element, the first output current of the battery cell is determined, and the first output current is the current value of the battery cell when discharging in the first time period of multiple constant temperature time periods; the discharge capacity of the battery cell at the beginning of heating is calculated, that is, the current that the battery cell can provide in the first constant temperature stage. For each second time period in the multiple constant temperature time periods except the first time period, the resistance temperature coefficient of the heating element in the second time period is obtained; the situation that the resistance of the heating element changes due to the change of temperature during the heating process of the device is taken into account. According to the charging voltage, the resistance at room temperature and the resistance temperature coefficient of the heating element in the second time period, the second output current of the battery cell is determined. The second output current is the current value of the battery cell when it is discharged in the second time period; by understanding how the resistance changes with the temperature, the discharge behavior of the battery cell can be more accurately predicted and controlled, reducing the risk of overheating, and the discharge current of the battery cell in the subsequent heating stage is calculated, taking into account the influence of the resistance change. According to the discharge voltage of the battery cell, the first output current and each second output current, the actual capacity of the battery cell is determined. Combining all the data, the total energy output capacity of the battery cell under actual use conditions (including different temperatures and current requirements) is evaluated, and the accurate testing of the battery cell capacity is achieved, which prevents the battery cells with poor performance or safety hazards from entering the market, thereby improving the overall quality and reliability of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the related technologies, the drawings required for use in the embodiments of the present application or the related technical descriptions will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0054] FIG1 is an application environment diagram of a method for testing the capacitance of a heating device in one embodiment;

[0055] FIG2 is a schematic flow chart of a method for testing the capacitance of a heating device in one embodiment;

[0056] FIG3 is a schematic flow chart of a method for testing the capacitance of a heating device in another embodiment;

[0057] FIG4 is a block diagram of a capacitance testing device for a heating device in one embodiment;

[0058] FIG5 is a block diagram of a capacitance testing device for a heating device in another embodiment;

[0059] FIG. 6 is a diagram showing the internal structure of a computer device in one embodiment. DETAILED DESCRIPTION

[0060] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0061] The capacitance test method of the heating device provided in the embodiment of the present application can be applied in the application environment shown in Figure 1. Among them, the terminal 102 communicates with the server 104 through the network. The data storage system can store the data that the server 104 needs to process. The data storage system can be integrated on the server 104, or it can be placed on the cloud or other network servers. The terminal 102 generates a capacitance test request for the heating device, and sends the capacitance test request for the heating device to the server 104, so that the server 104 determines the actual capacitance of the battery cell according to the discharge voltage of the battery cell, the first output current and each second output current. Among them, the terminal 102 can be, but is not limited to, various personal computers, laptops, smart phones, tablet computers, Internet of Things devices and portable wearable devices. The Internet of Things devices can be smart speakers, smart TVs, smart air conditioners, smart car-mounted devices, projection devices, etc. The portable wearable device can be a smart watch, a smart bracelet, a head-mounted device, etc. The head-mounted device can be a virtual reality (VR) device, an augmented reality (AR) device, smart glasses, etc. The server 104 may be an independent physical server, or a server cluster or distributed system composed of multiple physical servers, or a cloud server that provides cloud computing services.

[0062] In an exemplary embodiment, as shown in FIG2 , a method for testing the capacitance of a heating appliance is provided, and the method is described by taking the application of the method to the server 104 in FIG1 as an example, and includes the following steps 202 to 210. Among them:

[0063] Step 202, determining a plurality of constant temperature time periods of the heating element during the heating process.

[0064] Among them, heating devices refer to special devices for "heated not burned" tobacco products. Such devices produce nicotine-containing vapor by heating special tobacco sticks or cartridges instead of igniting them. The heating process is usually carried out at a lower temperature to reduce the possibility of producing harmful combustion byproducts.

[0065] The heating element is a key component in a heating device, which is mainly used to heat tobacco sticks or cigarette cartridges. In the document, the temperature coefficient of resistance (TCR) of the heating element is mentioned, which indicates the characteristic that the resistance of the heating element changes with temperature. The resistance value of the heating element will affect the current size during the heating process, and thus affect the heating speed and temperature control.

[0066] The battery cell is the basic unit of the battery and the energy supply part of the heating appliance. The performance of the battery cell directly affects the battery life and user experience of the heating appliance.

[0067] The constant temperature time period refers to the time period during which the heating element maintains a constant temperature during the heating process. For example, the constant temperature is 366°C from 0 to 20 seconds, and the constant temperature is 364°C from 80 to 90 seconds. These time periods are used to simulate the temperature changes of the heating device in actual use, so as to test the performance of the battery cell at different temperatures.

[0068] Specifically, the heating process of the HNB device usually includes multiple stages such as preheating and constant temperature heating, among which the constant temperature heating stage is the key because it directly determines the heating degree of the tobacco product and the user experience.

[0069] Optionally, according to product requirements and specifications, the constant temperature time periods during the heating process of the appliance are identified, which correspond to different temperature stages of the appliance when heating tobacco products. For example, from 0 seconds to 20 seconds, the temperature of the appliance heating element is constant at 366°C; from 80 seconds to 90 seconds, the temperature is constant at 364°C; from 120 seconds to 180 seconds, and then to 230 seconds, the temperature is constant at 373°C.

[0070] Step 204 , determining a first output current of the battery cell according to the charging voltage of the battery cell and the constant temperature resistance of the heating element, wherein the first output current is a current value of the battery cell being discharged in a first time period among a plurality of constant temperature time periods.

[0071] Among them, the charging voltage refers to the charging termination voltage, that is, during the charging process, when the battery cell voltage reaches and exceeds this voltage value, the charging process should stop at the voltage threshold. This is usually a safety and performance parameter when designing the battery cell to avoid overcharging and protect the battery cell from damage.

[0072] The room temperature resistance of a heating element refers to the resistance value of the heating element at room temperature. This value reflects the electrical properties of the heating element material in an unheated state and is the basis for calculating the resistance change of the heating element at different temperatures.

[0073] The first time period refers to the starting time period of multiple constant temperature time periods. The first output current refers to the maximum current that the battery cell can provide at a given charge termination voltage. This usually occurs during the discharge of the battery cell, especially in the initial heating stage of the heating device, when a larger current is required to quickly heat the heating element.

[0074] Specifically, the charging termination voltage of the battery cell and the resistance value of the heating element at room temperature are determined, and the ratio between the charging termination voltage of the battery cell and the resistance value of the heating element at room temperature is used as the output current of the heating device in the initial heating stage, i.e., the first output current.

[0075] For example, from 0 seconds to 20 seconds, the battery cell outputs at full power, that is, discharges at a constant current close to 4A to quickly heat the heating element to 366°C. The current calculated for full power output here is based on the room temperature resistance of the heating element and the set voltage (4.2V), that is, I=Y / R, so the calculated current is about 3.8A, which is approximately 4A.

[0076] Step 206, for each second time period except the first time period in the plurality of constant temperature time periods, obtain the resistance temperature coefficient of the heating element in the second time period.

[0077] The second time period refers to a constant temperature time period other than the start time period among the multiple constant temperature time periods.

[0078] The temperature coefficient of resistance (TCR) of a heating element is a physical quantity that measures the degree to which the resistivity of a material changes with temperature. In heating elements (such as heating elements used in HNB appliances), TCR is a very important parameter because it directly affects the resistance value of the heating element at different temperatures. A low TCR value means that the resistance changes less with temperature and the heating performance of the heating element is more stable.

[0079] Specifically, since the resistance temperature coefficient of the heating element is different in different constant temperature time periods, it is necessary to obtain the resistance temperature coefficient of the heating element in each second time period except the first time period in multiple constant temperature time periods.

[0080] Step 208, determining a second output current of the battery cell according to the charging voltage, the room temperature resistance and the resistance temperature coefficient of the heating element in the second time period, where the second output current is the current value of the battery cell when discharging in the second time period.

[0081] The second output current refers to the maximum current that the battery cell can provide in each constant temperature time period except the starting time period in the multiple constant temperature time periods. Geographically, the number of constant temperature time periods except the starting time period in the multiple constant temperature time periods corresponds to the number of the second output currents.

[0082] Specifically, taking one of the constant temperature time periods other than the starting time period in the multiple constant temperature time periods as an example, first determine the actual resistance of the heating element in the constant temperature time period based on the resistance temperature coefficient of the heating element in the constant temperature time period and the room temperature resistance of the heating element. Then further determine the maximum current that the battery cell can provide in the constant temperature time period, that is, the second output current, based on the actual resistance of the heating element in the constant temperature time period and the charging termination voltage of the battery cell. As a result, the number of constant temperature time periods other than the starting time period in the multiple constant temperature time periods corresponds one to one to the number of second output currents. Therefore, in each constant temperature time period other than the starting time period in the multiple constant temperature time periods, a corresponding second output current can be determined.

[0083] Step 210 , determining the actual capacity of the battery cell according to the discharge voltage of the battery cell, the first output current and each second output current.

[0084] The discharge voltage refers to the lowest allowable working voltage of the battery during the discharge process, that is, the voltage threshold that the battery should not be lower than when discharging, usually called the discharge cut-off voltage. When the voltage of the battery drops to this level, the discharge should be stopped to prevent the battery from entering a deep discharge state and causing irreversible damage to the battery, thereby protecting the battery and extending its service life.

[0085] The actual capacity of a battery cell refers to the maximum amount of charge that the battery cell can store and release under certain conditions. The actual capacity is one of the important parameters for measuring the performance of a battery cell, and it is directly related to the battery life.

[0086] Specifically, first obtain the minimum allowable operating voltage of the battery cell during the discharge process, and determine the total amount of electricity released when the battery cell is fully discharged to the undervoltage voltage during this test based on the minimum allowable operating voltage of the battery cell during the discharge process and the first output current determined in the previous step, thereby obtaining the actual capacity of the battery cell during this test.

[0087] It is understandable that, considering that the actual capacity of the battery cell under different conditions can be determined through multiple charge and discharge cycles. Therefore, according to the minimum allowable operating voltage of the battery cell during the discharge process, and each second output current determined in the previous step, the total amount of electricity released when the battery cell is fully discharged to the undervoltage voltage during another test process is determined, thereby obtaining the actual capacity of the battery cell during the other test process. Finally, according to the actual capacity of the battery cell during multiple tests, the final actual capacity of the battery cell is obtained.

[0088] In one of the embodiments, the charging time of the battery cell is determined based on the charging current of the battery cell, the room temperature resistance of the heating element and the charging voltage of the battery cell. The charging time is the time taken for the battery cell to be charged with the charging current until the voltage of the battery cell reaches the charging voltage.

[0089] The charging current of the battery cell is the maximum charging current of the battery cell.

[0090] Specifically, the maximum charging current of the battery cell needs to be obtained first. Since the battery cell has not been charged at this time, the actual resistance of the heating element has not changed. The actual resistance of the heating element at this time is still its normal temperature resistance at room temperature. Then, based on the maximum charging current of the battery cell and the normal temperature resistance of the heating element, the time it takes to charge the battery cell with the maximum charging current until the voltage of the battery cell reaches the charging termination voltage, i.e., the charging duration, is determined. Finally, the battery cell is charged based on the determined charging duration and the maximum charging current of the battery cell.

[0091] By using the maximum charging current of the battery cell, the battery cell can be charged to the specified voltage in a shorter time, ensuring that the battery cell reaches a fully charged state, which is crucial for subsequent aging tests and performance evaluations. In addition, using the maximum charging current for testing can better simulate the user's usage habits and verify the performance and stability of the battery cell under high-intensity charging conditions.

[0092] In one of the embodiments, the target temperature difference is determined based on the room temperature of the heating element and the constant temperature corresponding to the second time period; the actual resistance of the heating element in the second time period is determined based on the target temperature difference, the resistance temperature coefficient and the room temperature resistance of the heating element; the ratio between the actual resistance of the heating element and the charging voltage is determined, and the ratio is used as the second output current of the battery cell.

[0093] Among them, the constant temperature refers to the temperature corresponding to the heating element in each constant temperature time period. The target temperature difference refers to the temperature difference between the constant temperature and the normal temperature of the heating element. The actual resistance refers to the resistance value of the heating element that changes with the increase of temperature.

[0094] Specifically, first, the constant temperature of the heating element in the second time period is subtracted from the normal temperature of the heating element to obtain a target temperature difference. Then, according to the target temperature difference, the resistance temperature coefficient of the heating element in the second time period, and the normal temperature resistance of the heating element, the resistance value of the heating element that changes with the increase of temperature in the second time period, i.e., the actual resistance, is determined.

[0095] By determining the target temperature difference and calculating the actual resistance of the heating element at a specific temperature, the resistance change of the heating element at different temperatures can be accurately reflected. This allows the output current of the battery cell to be dynamically adjusted based on the actual resistance of the heating element at different temperatures, ensuring that in each constant temperature period, the battery cell can be discharged with a current that matches the resistance change of the heating element, simulating the current demand in the actual working process. This ensures that the load borne by the battery cell in the aging test matches the load in actual use, thereby improving the validity of the test results and the accuracy of the battery cell evaluation.

[0096] In one of the embodiments, the product value of the target temperature difference, the resistance temperature coefficient, and the room-temperature resistance of the heating element is determined; the product value of the target temperature difference, the resistance temperature coefficient, the room-temperature resistance of the heating element and the room-temperature resistance of the heating element are summed to obtain the actual resistance of the heating element in the second time period.

[0097] Specifically, according to the target temperature difference, the resistance temperature coefficient and the room temperature resistance of the heating element, the actual resistance of the heating element in the second time period is determined by the following calculation formula:

[0098] R 实际 =TCR×(T 恒温 -T 常温 )×R 常温 +R 常温

[0099] Among them, R 实际 is the actual resistance of the heating element in the second time period, TCR is the resistance temperature coefficient of the heating element in the second time period, R 常温 is the room temperature resistance of the heating element, T 恒温 is the constant temperature of the heating element in the second time period, T 常温 is the room temperature of the heating element, T 恒温 -T 常温 is the target temperature difference.

[0100] Since the resistance of the heating element of the HNB device changes with the temperature during use, the resistance value calculated by this formula can more accurately reflect the resistance characteristics of the heating element at different temperatures, so that the battery cell aging test and capacity division process can more realistically simulate the use environment of the device, improving the accuracy and reliability of the test results.

[0101] In one of the embodiments, a first capacitance of the battery cell is determined based on a discharge voltage and a first output current of the battery cell; a second capacitance of the battery cell is determined based on the discharge voltage and each second output current of the battery cell; and an average capacitance of the first capacitance and the second capacitance is taken as an actual capacitance of the battery cell.

[0102] Among them, the first capacitance refers to the capacitance calculated based on the discharge voltage of the battery cell when the battery cell is discharged at the "first output current". The second capacitance refers to a series of capacitances calculated based on the same discharge voltage when the battery cell is discharged at different "second output currents". The "second output current" here can be multiple different current values, the purpose of which is to evaluate the performance of the battery cell under different load conditions. Under each second output current, the discharge process of the battery cell also starts from a fully charged state until the voltage drops to the same cut-off voltage, and the total charge of each discharge is recorded to obtain multiple second capacitance values. The actual capacitance of the battery cell refers to the value obtained by taking the average of the first capacitance and all second capacitances.

[0103] Specifically, step 1: ensure that the battery cell is fully charged to its maximum capacity. Step 2: set the discharge current to the preset "first output current" value. Start the discharge process and record the discharge cut-off voltage of the battery cell at the same time. When the battery cell is discharged to the specified discharge cut-off voltage, stop discharging. At this time, according to the current and time recorded during the discharge process, calculate the total amount of charge discharged to obtain the first capacitance. Step 3: repeat the operation of step 2 for each "second output current". Each test uses a different discharge current, but the discharge cut-off voltage remains unchanged. Each time the discharge is to the specified discharge cut-off voltage, calculate the total amount of charge discharged to obtain the corresponding second capacitance. Step 4: calculate the average capacitance, average capacitance = (first capacitance + sum of all second capacitances) / (number of second capacitances + 1). The calculated average capacitance is regarded as the actual capacitance of the battery cell.

[0104] By testing the discharge characteristics of the battery cell at different output currents, the capacity performance of the battery cell under various working conditions can be obtained. This is more comprehensive than testing only at a single current and can reflect the performance of the battery cell in various situations that may be encountered in actual use.

[0105] In one of the embodiments, a discharge termination condition is obtained, and the discharge termination condition includes discharging until a first preset time period ends or discharging until the actual voltage of the battery cell is less than the discharge voltage. In the process of discharging the battery cell with a first output current, if the discharge termination condition of discharging until the first preset time period ends is reached first, the product value between the first output current and the first preset time period is used as the first capacitance of the battery cell. If the discharge termination condition of discharging until the actual voltage of the battery cell is less than the discharge voltage ends is reached first, the discharge time when the actual voltage of the battery cell is less than the discharge voltage is obtained, and the product value between the discharge time and the first output current is used as the first capacitance of the battery cell.

[0106] Among them, the discharge end condition refers to the rule or standard for determining when the discharge stops during the battery cell discharge test. This application proposes two discharge end conditions: the first is to discharge to the end of the first preset time length, which means that no matter what the actual voltage of the battery cell is, as long as the discharge time reaches the preset time length, the discharge process will stop. This is a time-based discharge end condition. The second is to discharge until the actual voltage of the battery cell is less than the discharge voltage, which means that the discharge end condition is based on voltage. When the actual voltage of the battery cell during the discharge process drops below the preset discharge voltage, the discharge process will also stop.

[0107] The first preset duration refers to a time length pre-set in the discharge test. If the discharge time reaches this preset duration first during the discharge process of the battery cell, the discharge process will end without considering the voltage condition. The selection of this duration is usually based on the expected discharge performance of the battery cell and the test requirements.

[0108] The discharge duration refers to the actual time that the cell experiences from the start of discharge until the discharge end condition is met. If the actual voltage of the cell first drops below the discharge voltage during the discharge process, then this actual discharge time is the discharge duration. It can be understood that the discharge duration is dynamic and depends on the actual discharge rate of the cell and the voltage change during the discharge process.

[0109] Specifically, first confirm that the battery cell has been fully charged to a specified state. Define the discharge end condition, including a first preset duration and a discharge voltage threshold. Then use the first output current to discharge the battery cell, and start timing and monitor the actual voltage of the battery cell at the same time. Continue to monitor the actual voltage and discharge duration of the battery cell until any discharge end condition is met. Next, determine the discharge end condition. If the battery cell first reaches the first preset duration during the discharge process, stop discharging immediately. If the actual voltage of the battery cell first drops below the discharge voltage threshold, stop discharging immediately. Finally, if the discharge ends due to reaching the first preset duration, calculate the first capacitance as the first output current multiplied by the first preset duration. If the discharge ends due to the actual voltage of the battery cell dropping below the discharge voltage, record the discharge duration when the actual voltage drops to the discharge voltage, and then calculate the first capacitance as the discharge duration multiplied by the first output current.

[0110] By setting two discharge end conditions, both time and voltage factors are taken into account, which enables the discharge performance of the battery cell to be comprehensively evaluated in different dimensions. The time-based discharge end condition can verify the stable current that the battery cell can provide within a fixed time, while the voltage-based discharge end condition can evaluate the voltage stability of the battery cell and the discharge performance when the voltage drops. And by setting clear discharge end conditions in the discharge test, it is possible to effectively avoid damage to the battery cell caused by excessive discharge, protect the battery cell, and extend its service life. At the same time, the test method in the solution can quickly identify battery cells that do not meet performance standards, thereby improving production efficiency and product quality.

[0111] In one embodiment, the total duration of the heating device during the heating process is 240 seconds, and the temperature is maintained at 366°C from 0 to 20 seconds, at 364°C at 80 seconds, at 364°C at 90 seconds, at 373°C at 120 seconds, at 373°C at 180 seconds, and at 373°C at 230 seconds.

[0112] First, charge the battery with the maximum charging current of the battery, and charge until the voltage of the battery reaches the charging termination voltage. After charging, it needs to be cooled at room temperature for a period of time. The cooling time can be set according to actual needs, such as cooling for 1 minute.

[0113] From the 0th second to the 20th second, the ratio between the charge termination voltage of the battery cell and the room temperature resistance of the heating element is used as the output current for constant current output at the 20th second.

[0114] From the 20th second to the 90th second, according to the formula: R 实际 =TCR×(T 恒温 -T 常温 )×R 常温 +R 常温 , calculate the actual resistance of the heating element from the 20th second to the 90th second. And further use the ratio between the charging termination voltage of the battery cell and the actual resistance of the heating element from the 20th second to the 90th second as the output current from the 20th second to the 90th second. 实际 is the actual resistance of the heating element from the 20th second to the 90th second, TCR is the resistance temperature coefficient of the heating element from the 20th second to the 90th second, R 常温 is the room temperature resistance of the heating element, T 恒温 is the constant temperature of the heating element from the 20th second to the 90th second, T 常温 is the room temperature of the heating element, T 恒温 -T 常温 It is the target temperature difference between the 20th second and the 90th second.

[0115] From the 90th second to the 240th second, according to the formula: R实际 =TCR×(T 恒温 -T 常温 )×R 常温 +R 常温 , calculate the actual resistance of the heating element from the 90th second to the 240th second. And further use the ratio between the charging termination voltage of the battery cell and the actual resistance of the heating element from the 90th second to the 240th second as the output current from the 90th second to the 240th second. 实际 is the actual resistance of the heating element from the 90th second to the 240th second, TCR is the resistance temperature coefficient of the heating element from the 90th second to the 240th second, R 常温 is the room temperature resistance of the heating element, T 恒温 is the constant temperature of the heating element from the 90th second to the 240th second, T 常温 is the room temperature of the heating element, T 恒温 -T 常温 It is the target temperature difference between the 90th second and the 240th second.

[0116] After the battery is discharged, it needs to be cooled at room temperature for a period of time, which can be set according to actual needs, such as cooling for 1 minute. Next, according to the specific input and output of the above battery, the capacity division setting is performed as follows:

[0117] Step 1: Check the battery cells first to ensure that there are no abnormalities in the installation.

[0118] Step 2: First charge the battery cell with the maximum charging current of the battery cell. When the voltage of the battery cell reaches the charging termination voltage, maintain the charging termination voltage for constant voltage charging until the current of the battery cell is less than the preset current, and then the charging is terminated.

[0119] Step 3: After charging is completed, let the battery sit and wait for the battery to cool down.

[0120] Step 4: Next, the battery cell is discharged at a constant current with the output current from the 20th second to the 90th second. If the voltage of the battery cell is greater than the discharge cut-off voltage of the battery cell during the discharge process, the constant current discharge is continued for 20 seconds. If the voltage of the battery cell is less than the discharge cut-off voltage of the battery cell, the constant current discharge is terminated in advance.

[0121] Step 5: The battery cell is then discharged at a constant current with the output current from the 90th second to the 240th second. If the voltage of the battery cell is greater than the discharge cut-off voltage of the battery cell during the discharge process, the constant current discharge is continued for 220 seconds. If the voltage of the battery cell is less than the discharge cut-off voltage of the battery cell, the constant current discharge is terminated in advance.

[0122] Step 6: After the discharge is completed, set aside and wait for the battery cell to cool down.

[0123] Step 7: Repeat the process from step 4 to step 6 15 times.

[0124] Step 8: Repeat the process from step 2 to step 7 300 times.

[0125] Step 9: Capacity separation is completed.

[0126] In an exemplary embodiment, as shown in FIG3 , steps 302 to 312 are included. Among them:

[0127] Step 302, determining a plurality of constant temperature time periods of the heating element during the heating process;

[0128] Step 304, determining the charging time of the battery cell according to the charging current of the battery cell, the room temperature resistance of the heating element, and the charging voltage of the battery cell, where the charging time is the time taken for the battery cell to be charged with the charging current until the voltage of the battery cell reaches the charging voltage;

[0129] Step 306, determining a first output current of the battery cell according to the charging voltage of the battery cell and the constant temperature resistance of the heating element, where the first output current is a current value of the battery cell being discharged in a first time period among the multiple constant temperature time periods;

[0130] Step 308, for each second time period except the first time period in the plurality of constant temperature time periods, obtaining the resistance temperature coefficient of the heating element in the second time period;

[0131] Step 310, determining a target temperature difference according to the room temperature of the heating element and the constant temperature corresponding to the second time period; determining the product value of the target temperature difference, the resistance temperature coefficient, and the room temperature resistance of the heating element; summing the product value of the target temperature difference, the resistance temperature coefficient, the room temperature resistance of the heating element, and the room temperature resistance of the heating element to obtain the actual resistance of the heating element in the second time period; determining the ratio between the actual resistance of the heating element and the charging voltage, and using the ratio as the second output current of the battery cell; the second output current is the current value of the battery cell discharged in the second time period;

[0132] Step 312, obtaining the discharge end condition, which includes discharging until the first preset time ends or discharging until the actual voltage of the battery cell is less than the discharge voltage. In the process of discharging the battery cell with the first output current, if the discharge end condition is reached first, the product value between the first output current and the first preset time is used as the first capacitance of the battery cell. If the discharge end condition is reached first, the discharge end time when the actual voltage of the battery cell is less than the discharge voltage ends, the discharge time when the actual voltage of the battery cell is less than the discharge voltage is obtained, and the product value between the discharge time and the first output current is used as the first capacitance of the battery cell. The second capacitance of the battery cell is determined according to the discharge voltage of the battery cell and each second output current; the average capacitance of the first capacitance and the second capacitance is used as the actual capacitance of the battery cell.

[0133] It should be understood that, although the steps in the flowcharts involved in the above embodiments are displayed in sequence according to the indication of the arrows, these steps are not necessarily executed in sequence according to the order indicated by the arrows. Unless there is a clear explanation in this article, the execution of these steps is not strictly limited in order, and these steps can be executed in other orders. Moreover, at least a part of the steps in the flowcharts involved in the above embodiments may include multiple steps or multiple stages, and these steps or stages are not necessarily executed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily carried out in sequence, but can be executed in turn or alternately with other steps or at least a part of the steps or stages in other steps.

[0134] Based on the same inventive concept, the embodiment of the present application also provides a heating device capacitance testing device for implementing the above-mentioned heating device capacitance testing method. The implementation scheme for solving the problem provided by the device is similar to the implementation scheme recorded in the above-mentioned method, so the specific limitations in the embodiments of one or more heating device capacitance testing devices provided below can refer to the limitations of the heating device capacitance testing method above, and will not be repeated here.

[0135] In an exemplary embodiment, as shown in FIG. 4 , a capacitance testing device 400 for a heating device is provided, comprising: a first determination module 402, a second determination module 404, an acquisition module 406, a third determination module 408, and a fourth determination module 410, wherein:

[0136] The first determination module 402 is used to determine a plurality of constant temperature time periods of the heating element during the heating process;

[0137] A second determination module 404 is used to determine a first output current of the battery cell according to the charging voltage of the battery cell and the constant temperature resistance of the heating element, where the first output current is a current value of the battery cell being discharged in a first time period among the multiple constant temperature time periods;

[0138] An acquisition module 406 is used to acquire the resistance temperature coefficient of the heating element in each second time period except the first time period in the plurality of constant temperature time periods;

[0139] A third determination module 408 is used to determine a second output current of the battery cell according to the charging voltage, the normal temperature resistance and the resistance temperature coefficient of the heating element in the second time period, where the second output current is a current value of the battery cell being discharged in the second time period;

[0140] The fourth determination module 410 is used to determine the actual capacity of the battery cell according to the discharge voltage of the battery cell, the first output current and each second output current.

[0141] In one embodiment, the capacitance testing device of the heating device also includes a fifth determination module 412, which is used to determine the charging time of the battery cell based on the charging current of the battery cell, the room temperature resistance of the heating element and the charging voltage of the battery cell. The charging time is the time taken for the battery cell to be charged with the charging current until the voltage of the battery cell reaches the charging voltage.

[0142] In one embodiment, the third determination module 408 is used to determine the target temperature difference based on the room temperature of the heating element and the constant temperature corresponding to the second time period; determine the actual resistance of the heating element in the second time period based on the target temperature difference, the resistance temperature coefficient and the room temperature resistance of the heating element; determine the ratio between the actual resistance of the heating element and the charging voltage, and use the ratio as the second output current of the battery cell.

[0143] In one embodiment, the third determination module 408 is used to determine the product value of the target temperature difference, the resistance temperature coefficient, and the normal-temperature resistance of the heating element; the product value of the target temperature difference, the resistance temperature coefficient, the normal-temperature resistance of the heating element and the normal-temperature resistance of the heating element are summed to obtain the actual resistance of the heating element in the second time period.

[0144] In one embodiment, the fourth determination module 410 is used to determine the first capacitance of the battery cell based on the discharge voltage and the first output current of the battery cell; determine the second capacitance of the battery cell based on the discharge voltage and each second output current of the battery cell; and use the average capacitance of the first capacitance and the second capacitance as the actual capacitance of the battery cell.

[0145] In one embodiment, the fourth determination module 410 is used to obtain the discharge termination condition, which includes that the discharge ends when the first preset time is ended or the actual voltage of the battery cell is less than the discharge voltage; in the process of discharging the battery cell with the first output current, if the discharge termination condition of discharging to the first preset time is reached first, the product value between the first output current and the first preset time is used as the first capacitance of the battery cell; if the discharge termination condition of discharging to the actual voltage of the battery cell is less than the discharge voltage is reached first, the discharge duration when the actual voltage of the battery cell is less than the discharge voltage is obtained, and the product value between the discharge duration and the first output current is used as the first capacitance of the battery cell.

[0146] In another embodiment, as shown in FIG5 , FIG5 is a structural block diagram of a capacitance test device for a heating device in another embodiment, including: a first determination module 402, a second determination module 404, an acquisition module 406, a third determination module 408, and a fourth determination module 410. The capacitance test device 400 for a heating device further includes a fifth determination module 412, which is used to determine the charging time of the battery cell according to the charging current of the battery cell, the room temperature resistance of the heating element, and the charging voltage of the battery cell. The charging time is the time taken for the battery cell to be charged with the charging current until the voltage of the battery cell reaches the charging voltage.

[0147] Each module in the above-mentioned capacitance test device for a heating device can be implemented in whole or in part by software, hardware, or a combination thereof. Each of the above-mentioned modules can be embedded in or independent of a processor in a computer device in the form of hardware, or can be stored in a memory in a computer device in the form of software, so that the processor can call and execute operations corresponding to each of the above modules.

[0148] In an exemplary embodiment, a computer device is provided, which may be a server, and its internal structure diagram may be shown in FIG6. The computer device includes a processor, a memory, an input / output interface (Input / Output, referred to as I / O) and a communication interface. Among them, the processor, the memory and the input / output interface are connected through a system bus, and the communication interface is connected to the system bus through the input / output interface. Among them, the processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program and a database. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The database of the computer device is used to store data related to the capacitance test of the heating device. The input / output interface of the computer device is used to exchange information between the processor and the external device. The communication interface of the computer device is used to communicate with an external terminal through a network connection. When the computer program is executed by the processor, a capacitance test method of a heating device is implemented.

[0149] Those skilled in the art will understand that the structure shown in FIG. 6 is merely a block diagram of a partial structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than shown in the figure, or combine certain components, or have a different arrangement of components.

[0150] In one embodiment, a computer device is further provided, including a memory and a processor, wherein a computer program is stored in the memory, and the processor implements the steps in the above method embodiments when executing the computer program.

[0151] In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the steps in the above-mentioned method embodiments are implemented.

[0152] In one embodiment, a computer program product is provided, including a computer program, which implements the steps in the above method embodiments when executed by a processor.

[0153] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, stored data, displayed data, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties, and the collection, use and processing of relevant data must comply with relevant regulations.

[0154] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiments can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to the memory, database or other medium used in the embodiments provided in this application can include at least one of non-volatile memory and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. As an illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM). The database involved in each embodiment provided in this application may include at least one of a relational database and a non-relational database. Non-relational databases may include distributed databases based on blockchains, etc., but are not limited to this. The processor involved in each embodiment provided in this application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, an artificial intelligence (AI) processor, etc., but are not limited to this.

[0155] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this application.

[0156] The above embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A method for testing the capacitance of a heating device, characterized in that: The heating device comprises a heating element and a battery core, and the method comprises: Determining a plurality of constant temperature time periods of the heating element during the heating process; Determine a first output current of the battery cell according to the charging voltage of the battery cell and the constant temperature resistance of the heating element, wherein the first output current is a current value of the battery cell being discharged in a first time period among the multiple constant temperature time periods; For each second time period except the first time period in the plurality of constant temperature time periods, obtaining a resistance temperature coefficient of the heating element in the second time period; Determine a second output current of the battery cell according to the charging voltage, the normal temperature resistance and the resistance temperature coefficient of the heating element in the second time period, wherein the second output current is a current value of the battery cell when discharging in the second time period; The actual capacity of the battery cell is determined according to the discharge voltage of the battery cell, the first output current and each of the second output currents.

2. The method according to claim 1, characterized in that Before determining the first output current of the battery cell according to the charging voltage of the battery cell and the normal temperature resistance of the heating element, the method further includes: The charging time of the battery cell is determined according to the charging current of the battery cell, the room temperature resistance of the heating element and the charging voltage of the battery cell. The charging time is the time taken for the battery cell to be charged with the charging current until the voltage of the battery cell reaches the charging voltage.

3. The method according to claim 1, characterized in that The determining the second output current of the battery cell according to the charging voltage, the normal temperature resistance and the resistance temperature coefficient of the heating element in the second time period includes: Determining a target temperature difference according to the normal temperature of the heating element and the constant temperature corresponding to the second time period; determining the actual resistance of the heating element in the second time period according to the target temperature difference, the resistance temperature coefficient and the room temperature resistance of the heating element; The ratio between the actual resistance of the heating element and the charging voltage is determined, and the ratio is used as the second output current of the battery cell.

4. The method according to claim 3, characterized in that The determining, according to the target temperature difference, the resistance temperature coefficient, and the room-temperature resistance of the heating element, the actual resistance of the heating element in the second time period comprises: Determine the product value of the target temperature difference, the resistance temperature coefficient, and the room temperature resistance of the heating element; The actual resistance of the heating element in the second time period is obtained by summing the product of the target temperature difference, the resistance temperature coefficient, the room-temperature resistance of the heating element, and the room-temperature resistance of the heating element.

5. The method according to claim 1, characterized in that The determining the actual capacity of the battery cell according to the discharge voltage of the battery cell, the first output current and each of the second output currents includes: Determining a first capacity of the battery cell according to a discharge voltage of the battery cell and the first output current; determining a second capacity of the battery cell according to a discharge voltage of the battery cell and each of the second output currents; The average capacitance of the first capacitance and the second capacitance is used as the actual capacitance of the battery cell.

6. The method according to claim 5, characterized in that The step of determining a first capacity of the battery cell according to the discharge voltage of the battery cell and the first output current includes: Acquire a discharge end condition, wherein the discharge end condition includes discharging until a first preset time period ends or discharging until an actual voltage of the battery cell is less than a discharge voltage ends; In the process of discharging the battery cell with the first output current, if the discharge ends when the first preset time in the discharge end condition is reached first, the product value of the first output current and the first preset time is used as the first capacitance of the battery cell; If the discharge end condition in which the actual voltage of the battery cell is less than the discharge voltage is reached first, the discharge time when the actual voltage of the battery cell is less than the discharge voltage is obtained, and the product of the discharge time and the first output current is used as the first capacitance of the battery cell.

7. A capacitance testing device for a heating device, characterized in that: The device comprises: A first determination module is used to determine a plurality of constant temperature time periods of the heating element during the heating process; A second determination module is used to determine a first output current of the battery cell according to the charging voltage of the battery cell and the constant temperature resistance of the heating element, wherein the first output current is a current value of the battery cell being discharged in a first time period among the multiple constant temperature time periods; An acquisition module, for acquiring, for each second time period other than the first time period in the plurality of constant temperature time periods, a resistance temperature coefficient of the heating element in the second time period; A third determination module is used to determine a second output current of the battery cell according to the charging voltage, the normal temperature resistance and the resistance temperature coefficient of the heating element in the second time period, wherein the second output current is a current value of the battery cell being discharged in the second time period; The fourth determination module is used to determine the actual capacity of the battery cell according to the discharge voltage of the battery cell, the first output current and each of the second output currents.

8. A computer device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 6 are implemented.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 6 are implemented.

10. A computer program product, comprising a computer program, characterized in that When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 6 are implemented.

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