Capacity conversion method, electronic equipment and storage medium

Abstract

The invention provides a capacity conversion method, electronic equipment and a storage medium, and the method comprises the steps: obtaining a first constant current capacity of a target battery, the first constant current capacity being used for indicating a capacity obtained by carrying out the capacity detection of the target battery in a constant current mode; determining a second constant current capacity of the target battery at the calibrated battery temperature according to the first constant current capacity; and according to the first mapping relation between the constant current capacity and the constant power capacity at the calibrated battery temperature and the second constant current capacity, predicting the predicted constant power capacity of the target battery at the calibrated battery temperature when the capacity of the target battery is detected in a constant power mode. On the basis, the constant-current capacity of the battery at the calibrated battery temperature is converted into the constant-power capacity of the battery at the calibrated battery temperature by calibrating the first mapping relation between the constant-current capacity and the constant-power capacity of the battery at the calibrated battery temperature, so that the capacity conversion cost of the battery is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a capacity conversion method, an electronic device and a storage medium. BACKGROUND

[0002] In the field of energy storage battery manufacturing, downstream customers usually adopt a constant power mode (such as 0.5P constant power capacity determination at 25±2℃ constant temperature environment) to determine the capacity to detect capacity risks, while upstream manufacturers usually adopt a constant current mode (such as 0.5C constant current capacity determination cabinet mode) to determine the capacity to detect capacity risks. In the constant current mode, there is a problem of capacity detection distortion caused by temperature fluctuations, resulting in a large error between the capacity detected by the constant current mode and the capacity detected by the constant power mode.

[0003] To solve the above problem, the sampling method or the equipment modification method is usually used for capacity conversion. The sampling method refers to sampling a batch of batteries using the constant current mode, and then testing the sampled batteries in a constant temperature box after film welding. However, the tested batteries need to be scrapped, resulting in high conversion cost. The equipment modification method refers to modifying the capacity determination equipment to a constant power charging and discharging equipment. However, this method has the problem of high equipment replacement cost, which further leads to high conversion cost.

[0004] Therefore, the existing capacity conversion method has the problem of high conversion cost. SUMMARY

[0005] Embodiments of the present application provide a capacity conversion method, an electronic device and a storage medium, which aims to calibrate the first mapping relationship between the constant current capacity and the constant power capacity at the calibrated battery temperature, convert the constant current capacity of the battery at the calibrated battery temperature to the constant power capacity of the battery at the calibrated battery temperature, and reduce the conversion cost of the capacity conversion of the battery.

[0006] In a first aspect, embodiments of the present application provide a capacity conversion method, which comprises:

[0007] obtaining a first constant current capacity of a target battery, wherein the first constant current capacity is used to indicate the capacity detected by the constant current mode for the target battery;

[0008] determining a second constant current capacity of the target battery at a calibrated battery temperature according to the first constant current capacity;

[0009] According to the first mapping relationship between the constant-current capacity at the calibration battery temperature and the constant-power capacity, and the second constant-current capacity, a predicted constant-power capacity of the target battery at the calibration battery temperature is predicted when the capacity of the target battery is detected in a constant-power mode.

[0010] In an embodiment, the second constant-current capacity of the target battery at the calibration battery temperature is determined according to the first constant-current capacity, including:

[0011] The target battery temperature of the target battery in a capacity detection process corresponding to the first constant-current capacity is obtained.

[0012] The second constant-current capacity of the target battery at the calibration battery temperature is determined according to a second mapping relationship between the constant-current capacity at a non-calibration battery temperature and the constant-current capacity at the calibration battery temperature, and the target battery temperature and the first constant-current capacity.

[0013] In this way, the second constant-current capacity of the target battery at the calibration battery temperature can be determined according to the second mapping relationship, so as to solve the problem of constant-current capacity deviation caused by temperature deviation in the capacity detection process of the target battery, and improve the accuracy of the constant-power capacity determined according to the corrected second constant-current capacity.

[0014] In an embodiment, the second constant-current capacity of the target battery at the calibration battery temperature is determined according to a second mapping relationship between the constant-current capacity at a non-calibration battery temperature and the constant-current capacity at the calibration battery temperature, and the target battery temperature and the first constant-current capacity, including:

[0015] The temperature difference between the target battery temperature and the calibration battery temperature is calculated.

[0016] The capacity conversion coefficient in the second mapping relationship is determined according to the temperature difference.

[0017] The second constant-current capacity is determined according to the capacity conversion coefficient in the second mapping relationship and the first constant-current capacity.

[0018] In this way, the capacity conversion coefficient is determined by the temperature difference between the target battery temperature and the calibration battery temperature, so as to perform temperature correction of the constant-current capacity, thereby solving the problem of capacity detection distortion caused by temperature fluctuation in the capacity detection process in the constant-current mode, and improving the accuracy of the constant-power capacity corresponding to the second constant-current capacity.

[0019] In a second aspect, an embodiment of the present application provides a capacity conversion device, including:

[0020] The capacity obtaining module is configured to obtain a first constant-current capacity of the target battery, wherein the first constant-current capacity is used to indicate a capacity obtained by performing capacity detection on the target battery in a constant-current mode.

[0021] The capacity determining module is configured to determine a second constant-current capacity of the target battery at a calibration battery temperature according to the first constant-current capacity.

[0022] The capacity converting module is configured to predict a predicted constant-power capacity of the target battery at the calibration battery temperature when performing capacity detection on the target battery in a constant-power mode according to a first mapping relationship between the constant-current capacity and the constant-power capacity at the calibration battery temperature and the second constant-current capacity.

[0023] In a third aspect, an embodiment of the present application provides an electronic device, which comprises:

[0024] one or more processors;

[0025] a memory; and

[0026] one or more application programs, wherein the one or more application programs are stored in the memory and configured to be executed by the processor to implement the steps in the capacity conversion method according to any one of the first aspect.

[0027] In a fourth aspect, the present application further provides a computer readable storage medium, which stores a computer program, and the computer program is loaded by a processor to execute the steps in the capacity conversion method according to any one of the first aspect.

[0028] In a fifth aspect, the present application further provides a computer program product, which comprises computer programs / instructions, and the computer programs / instructions are executed by a processor to execute the steps in the capacity conversion method according to any one of the first aspect.

[0029] The beneficial effects of the embodiments of the present application are as follows:

[0030] In the embodiment of the present application, the first constant current capacity of the target battery is obtained, wherein the first constant current capacity is used to indicate the capacity obtained by detecting the capacity of the target battery in a constant current mode; the second constant current capacity of the target battery at the calibrated battery temperature is determined according to the first constant current capacity; and the predicted constant power capacity of the target battery at the calibrated battery temperature is predicted when the capacity of the target battery is detected in a constant power mode according to the first mapping relationship between the constant current capacity and the constant power capacity at the calibrated battery temperature and the second constant current capacity. Based on this, the constant current capacity of the battery at the calibrated battery temperature is converted into the constant power capacity of the battery at the calibrated battery temperature through the first mapping relationship between the constant current capacity and the constant power capacity at the calibrated battery temperature, so as to reduce the conversion cost of the capacity conversion of the battery. BRIEF DESCRIPTION OF DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0032] Figure 1 is a flowchart of the capacity conversion method provided in the embodiments of the present application;

[0033] Figure 2 is a determination diagram of the second mapping relationship of the capacity conversion method provided in the embodiments of the present application;

[0034] Figure 3 is a structure diagram of one embodiment of the capacity conversion device provided by the present application;

[0035] Figure 4 is a structure diagram of one embodiment of the electronic device provided in the embodiments of the present application. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the present application will be described clearly and completely in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application. In addition, it should be understood that the specific embodiments described herein are only used to illustrate and explain the present application, and are not used to limit the present application. In the present application, the orientation words such as "upper" and "lower" generally refer to the upper and lower directions of the device in the actual use or working state, and specifically refer to the drawing plane direction in the drawings; and "inner" and "outer" refer to the outline of the device.

[0037] In the field of energy storage battery manufacturing, downstream customers typically use constant power methods (such as 0.5P constant power capacity assessment at a constant temperature of 25±2℃) for capacity verification to detect capacity risks, while upstream manufacturers typically use constant current methods (such as 0.5C constant current capacity assessment) for capacity verification to detect capacity risks. During the constant current capacity assessment process, there is a risk of capacity measurement distortion due to temperature fluctuations, resulting in a significant error between the capacity measured using the constant current method and the capacity measured using the constant power method.

[0038] To address the above issues, capacity conversion is typically achieved through random sampling or equipment modification.

[0039] The sampling method involves randomly selecting samples from a batch of batteries using the constant current method, performing capacity testing on the sampled batteries, and then welding the resulting battery packs into a constant temperature chamber for constant power testing. However, the batteries used for testing need to be scrapped, resulting in high conversion costs. Furthermore, the sampled battery data cannot represent the entire batch. Using the constant power capacity obtained from the sampled data as the constant power capacity of the entire batch leads to low accuracy in predicting the constant power capacity of that batch.

[0040] One method involves modifying the capacity testing equipment to a constant power charge / discharge system. However, the dramatic increase in current at the start of charging and the end of discharging can easily damage the power module, requiring frequent replacements. This results in high equipment replacement costs and consequently, high conversion costs. Furthermore, using constant power charge / discharge equipment for capacity testing also leads to increased conversion costs due to excessive current accelerating equipment aging. Additionally, excessive current can exacerbate temperature differences between batteries in the same batch, resulting in lower accuracy in constant power capacity prediction.

[0041] To address at least some of the aforementioned problems, this application proposes a capacity conversion method, electronic device, and computer-storable medium to convert the constant current capacity of a battery at a calibrated battery temperature to the constant power capacity of the battery at a calibrated battery temperature by means of a first mapping relationship between the constant current capacity and the constant power capacity at a calibrated battery temperature, thereby reducing the conversion cost of capacity conversion of the battery.

[0042] like Figure 1 The diagram shown is a flowchart of an embodiment of the capacity conversion method in this application. This embodiment is applied to a capacity conversion device that uses a constant current method for capacity detection. The capacity conversion method includes steps S101 to S103:

[0043] In step S101, a first constant-current capacity of the target battery is obtained, where the first constant-current capacity is used to indicate a capacity obtained by performing capacity detection on the target battery in a constant-current manner.

[0044] The target battery refers to a battery that needs to be detected in capacity and converted in capacity.

[0045] It should be noted that the target battery mentioned in the present application is detected in capacity by a capacity grading device in a constant-current manner.

[0046] The constant-current manner refers to a control manner in which the current remains constant.

[0047] The first constant-current capacity refers to the constant-current capacity of the target battery at a corresponding battery temperature of the target battery, which can be a calibrated battery temperature or a non-calibrated battery temperature.

[0048] It can be understood that, since the battery temperature of the target battery changes when the capacity grading device detects the target battery in capacity in a constant-current manner, the measured constant-current capacity of the target battery also changes, and therefore the first constant-current capacity can be regarded as the constant-current capacity of the target battery at the corresponding battery temperature.

[0049] In step S102, a second constant-current capacity of the target battery at a calibrated battery temperature is determined according to the first constant-current capacity.

[0050] The calibrated battery temperature refers to the battery temperature corresponding to the battery when the battery is converted in constant-current capacity and constant-power capacity.

[0051] It can be understood that, since the first constant-current capacity is the constant-current capacity of the target battery at a battery temperature, which is not necessarily the calibrated battery temperature, it is necessary to convert the first constant-current capacity of the target battery into the second constant-current capacity of the target battery at the calibrated battery temperature, so as to subsequently convert the target battery in constant-power capacity based on the second constant-current capacity of the target battery at the calibrated battery temperature.

[0052] Specifically, the process of determining the second constant-current capacity of the target battery at the calibrated battery temperature according to the first constant-current capacity can include: obtaining a target battery temperature of the target battery in a capacity detection process corresponding to the first constant-current capacity; and determining the second constant-current capacity of the target battery at the calibrated battery temperature according to a second mapping relationship between the constant-current capacity at the non-calibrated battery temperature and the constant-current capacity at the calibrated battery temperature, and the target battery temperature and the first constant-current capacity.

[0053] The target battery temperature refers to the battery temperature of the target battery in the capacity detection process corresponding to the first constant-current capacity.

[0054] There are various ways to collect the target battery temperature, which can be adjusted according to actual conditions, and the embodiments of the present application are not limited. For example, the target battery temperature can be determined by collecting the temperature of the channel where the target battery is located in the capacity distribution device. For another example, the target battery temperature can be obtained by directly measuring the target battery.

[0055] There are various ways to determine the target battery temperature, which can be adjusted according to actual conditions, and the embodiments of the present application are not limited. The target battery temperature can refer to the average temperature of the target battery in the discharge stage during the capacity detection process. For example, during the capacity detection process of the target battery, the battery temperature of the target battery is continuously collected in the discharge stage of the target battery, and the average value or weighted average value of the collected multiple battery temperatures is solved as the target battery temperature. The target battery temperature can also refer to the maximum temperature of the target battery in the discharge stage during the capacity detection process. For example, during the capacity detection process of the target battery, the battery temperature of the target battery is continuously collected in the discharge stage of the target battery, and the maximum battery temperature is selected from the collected multiple battery temperatures as the target battery temperature. The target battery temperature can also refer to the median temperature of the target battery in the discharge stage during the capacity detection process.

[0056] The second mapping relationship refers to the conversion relationship between the constant current capacity at the non-calibration battery temperature and the constant current capacity at the calibration battery temperature.

[0057] In this way, the second constant current capacity of the target battery at the calibration battery temperature can be determined according to the second mapping relationship, so as to solve the constant current capacity deviation problem caused by temperature deviation during the capacity detection process of the target battery, so as to improve the accuracy of the constant power capacity determined according to the corrected second constant current capacity.

[0058] It should be noted that in the case that the target battery temperature is the calibration battery temperature, the first constant current capacity is directly taken as the second constant current capacity, otherwise, the second constant current capacity of the target battery at the calibration battery temperature needs to be determined through the second mapping relationship and the target battery temperature and the first constant current capacity.

[0059] It can be understood that in the case that the target battery temperature is not the calibration battery temperature, the target battery temperature can be substituted into the non-calibration battery temperature in the second mapping relationship, and the first constant current capacity can be substituted into the constant current capacity at the non-calibration battery temperature in the second mapping relationship. Since the calibration battery temperature in the second mapping relationship is known, the constant current capacity at the calibration battery temperature can be solved and taken as the second constant current capacity.

[0060] The specific solving process can be adjusted according to actual conditions, and the embodiments of the present application are not limited.

[0061] In an embodiment, the process of determining the second constant current capacity of the target battery at the calibrated battery temperature according to the second mapping relationship between the constant current capacity at the non-calibrated battery temperature and the constant current capacity at the calibrated battery temperature, and the target battery temperature and the first constant current capacity can include: calculating a temperature difference between the target battery temperature and the calibrated battery temperature; determining a capacity conversion coefficient in the second mapping relationship according to the temperature difference; and determining the second constant current capacity according to the capacity conversion coefficient in the second mapping relationship and the first constant current capacity.

[0062] The capacity conversion coefficient in the second mapping relationship refers to a conversion coefficient for converting the first constant current capacity to the second constant current capacity.

[0063] The process of determining the capacity conversion coefficient in the second mapping relationship according to the temperature difference can include: determining the capacity conversion coefficient in the second mapping relationship according to the temperature difference and a corresponding relationship between a preset temperature difference and a preset capacity conversion coefficient.

[0064] The process of determining the second constant current capacity according to the capacity conversion coefficient in the second mapping relationship and the first constant current capacity can include: determining the second constant current capacity according to a product or a ratio between the capacity conversion coefficient in the second mapping relationship and the first constant current capacity.

[0065] In this way, the capacity conversion coefficient determined by the temperature difference between the target battery temperature and the calibrated battery temperature is used to perform temperature correction of the constant current capacity, thereby solving the capacity detection distortion problem caused by temperature fluctuations in the constant current capacity determination process, and improving the accuracy of determining the constant power capacity corresponding to the second constant current capacity.

[0066] In an embodiment, the number of second mapping relationships includes a plurality of second mapping relationships, each second mapping relationship is configured with a temperature compensation coefficient, and different second mapping relationships correspond to different temperature compensation coefficients.

[0067] The temperature compensation coefficient refers to a coefficient for compensating for the difference between the target battery temperature and the non-calibrated temperature.

[0068] Based on this, the capacity conversion method further includes: determining a target second mapping relationship in which the non-calibrated battery temperature matched with the target battery temperature is located from the plurality of second mapping relationships.

[0069] It can be understood that different second mapping relationships correspond to different non-calibrated battery temperatures, and each second mapping relationship corresponds to the same calibrated battery temperature. Therefore, in the case where the target battery temperature of the target battery is known, the second mapping relationship in which the non-calibrated battery temperature matched with the target battery temperature is located can be determined as the target second mapping relationship from the plurality of second mapping relationships according to the target battery temperature.

[0070] Based on this, the step of determining the capacity conversion coefficient in the second mapping relationship based on the temperature difference may further include: determining the capacity conversion coefficient in the target second mapping relationship based on the temperature difference and the temperature compensation coefficient in the target second mapping relationship.

[0071] In one embodiment, before determining the second constant current capacity of the target battery at the calibrated battery temperature based on the first constant current capacity, the capacity conversion method further includes:

[0072] Acquire multiple sets of historical capacity assessment data. Each set of historical capacity assessment data includes the constant current capacity and battery temperature of at least one battery. The battery temperatures of the batteries included in each set of historical capacity assessment data belong to the same battery temperature range, and the batteries included in each set of historical capacity assessment data have the same battery attributes.

[0073] From multiple sets of historical capacity test data, a first set of historical capacity test data for calibration and at least one set of second historical capacity test data are determined, wherein the battery temperature range corresponding to the first historical capacity test data indicates the calibrated battery temperature, and the battery temperature range corresponding to the second historical capacity test data indicates a non-calibrated battery temperature.

[0074] For each set of second historical capacity test data, determine the initial second mapping relationship between the constant current capacity at the non-calibrated battery temperature and the constant current capacity at the calibrated battery temperature corresponding to the second historical capacity test data;

[0075] Based on the first and second historical capacity data, the initial second mapping relationship is fitted to obtain the temperature compensation coefficient.

[0076] Based on the temperature compensation coefficient and the initial second mapping relationship, a second mapping relationship corresponding to the second historical capacity split data is constructed.

[0077] Among them, battery attributes refer to the attributes of the battery used to measure capacity testing.

[0078] The specific details of battery attributes can be adjusted according to actual circumstances, and this application does not impose any limitations. For example, battery attributes include battery model. As another example, battery attributes include, but are not limited to, raw material capacity, particle size, electrode coating density and roll forming thickness, core package (wound core) weight, single-fill volume, and remaining quantity.

[0079] The process of acquiring multiple sets of historical capacity testing data includes: acquiring the capacity testing data of multiple batteries with the same battery attributes during a historical time period. The capacity testing data for each battery includes its corresponding constant current capacity and battery temperature. Based on the battery temperature of each battery, the capacity testing data is grouped to obtain multiple sets of historical capacity testing data, ensuring that the battery temperatures included in each set of historical capacity testing data belong to the same battery temperature range.

[0080] For example, suppose battery A has a temperature of 25.4℃ and battery B has a temperature of 29.6℃. The battery temperature ranges are grouped in 1℃ increments. Then, battery A can be assigned to the historical capacity rating data group corresponding to the battery temperature range (25℃, 26℃), and battery B can be assigned to the historical capacity rating data group corresponding to the battery temperature range (29℃, 30℃).

[0081] The above-mentioned step of determining the initial second mapping relationship between the constant current capacity at the non-calibrated battery temperature corresponding to the second historical capacity test data and the constant current capacity at the calibrated battery temperature includes: based on the initial second mapping relationship between the non-calibrated battery temperature indicated by the battery temperature range corresponding to the second historical capacity test data and the constant current capacity at the calibrated battery temperature.

[0082] In the initial second mapping relationship, the calibrated battery temperature is known information, the non-calibrated battery temperature comes from the battery temperature of the battery included in the second historical capacity test data, and the constant current capacity under the non-calibrated battery temperature comes from the constant current capacity of the corresponding battery included in the second historical capacity test data.

[0083] It is understandable that the constant current capacity at the calibrated battery temperature can be the average constant current capacity of multiple constant current capacities included in the first historical capacity grading data, or the weighted average constant current capacity of multiple constant current capacities included in the first historical capacity grading data, or the minimum constant current capacity of multiple constant current capacities included in the first historical capacity grading data. The specific value can be adjusted according to the actual situation, and there is no restriction here.

[0084] To facilitate understanding of the above content, the following will be combined with... Figure 2 Provide an explanation. For example... Figure 2 As shown, the process of obtaining the second mapping relationship in this application includes:

[0085] Capacity data of multiple batteries that underwent capacity testing within a preset time period was collected.

[0086] The preset time period refers to the time interval during which capacity testing is performed on multiple batteries with the same battery properties. For each battery, the average temperature of that battery during the 0.5C discharge stage is used as the independent variable. Here, 0.5C represents a charge / discharge current of 0.5 times the battery's rated capacity. For example, if the battery's rated capacity is 100Ah, then the charge / discharge current corresponding to 0.5C is 50A, which is the current used in the constant current method.

[0087] The capacity data are grouped at intervals of 1℃.

[0088] For example, after interval grouping, (25℃, 26℃) group historical data and (29℃, 30℃) group historical data are obtained, the battery temperature interval corresponding to the (25℃, 26℃) group historical data is (25℃, 26℃); the battery temperature interval corresponding to the (29℃, 30℃) group historical data is (29℃, 30℃), and the like.

[0089] It should be noted that the interval grouping of the data can also be performed according to 2℃ or 3℃, which can be adjusted according to actual conditions, and is not limited herein.

[0090] For each group of historical data, the average value of the multiple constant current capacities contained in the group of historical data is determined to represent the constant current capacity of the group of historical data. That is, as shown in the following formula: Figure 2 The point in the box.

[0091] Taking the (25℃, 26℃) group historical data as the first historical data and the other group historical data as the second historical data, the difference between the constant current capacity corresponding to each group of second historical data and the constant current capacity corresponding to the first historical data is calculated to form a curve as shown in the following formula: Figure 2

[0092] The curve is fitted to obtain a second mapping relationship.

[0093] Exemplarily, the second mapping relationship can be represented according to the following formula:

[0094] C 0.5C，25℃ = C 0.5C，Tavg × [1 + α(25 - Tavg)];

[0095] Wherein, 0.5C represents that the charging and discharging current is 0.5 times of the rated capacity of the battery, for example, if the rated capacity of the battery is 100 Ah, then the charging and discharging current corresponding to 0.5C is 50 A, that is, the current adopted by the constant current mode is 50 A. 25℃ refers to the rated battery temperature. C 0.5C，25℃ is the second constant current capacity, C 0.5C，Tavg is the first constant current capacity, and α is the temperature compensation coefficient. [1 + α(25 - T_avg)] is the capacity conversion coefficient in the second mapping relationship, and Tavg is the non-rated battery temperature.

[0096] It should be noted that for different second mapping relationships of the non-rated battery temperature, α is not necessarily the same.

[0097] ​In an embodiment, the capacity conversion method further comprises: updating the temperature compensation coefficient in each second mapping relationship when a preset update condition is met; wherein the preset update condition comprises that the battery attribute of the battery performing capacity detection changes, and / or the duration of performing capacity detection reaches a preset duration.

[0098] Specifically, when the battery attribute of the battery performing capacity detection changes, the capacity data of a plurality of batteries corresponding to the changed battery attribute is obtained, and the step of obtaining a plurality of sets of historical capacity data is continued to be executed according to the capacity data of the plurality of batteries, so as to update the temperature compensation coefficient in each second mapping relationship.

[0099] When the duration of performing capacity detection reaches a preset duration, if the battery attribute does not change, the capacity data of a plurality of batteries corresponding to the battery attribute in a historical time period is obtained, and the step of obtaining a plurality of sets of historical capacity data is continued to be executed according to the capacity data of the plurality of batteries, so as to update the temperature compensation coefficient in each second mapping relationship. The historical time period can refer to a time period of a preset duration before the current time. If the battery attribute changes, the capacity data of a plurality of batteries corresponding to the changed battery attribute is obtained, and the step of obtaining a plurality of sets of historical capacity data is continued to be executed according to the capacity data of the plurality of batteries, so as to update the temperature compensation coefficient in each second mapping relationship.

[0100] In this way, the temperature compensation coefficient is dynamically updated to solve the capacity detection distortion problem caused by temperature fluctuations of the capacity detection device during operation, and the accuracy of determining the constant power capacity corresponding to the second constant current capacity is improved.

[0101] In step S103, the first mapping relationship between the constant current capacity and the constant power capacity at the calibration battery temperature and the second constant current capacity are used to predict the predicted constant power capacity of the target battery at the calibration battery temperature when the target battery is detected by the constant power method.

[0102] The first mapping relationship refers to the conversion relationship between the constant current capacity and the constant power capacity at the calibration battery temperature.

[0103] The constant power method refers to a control method in which the power remains constant.

[0104] In this way, the predicted constant power capacity of the target battery at the calibration battery temperature when the target battery is detected by the constant power method can be predicted according to the first mapping relationship, so as to realize accurate conversion from the second constant current capacity at the calibration battery temperature to the predicted constant power capacity at the calibration battery temperature, and avoid device modification and battery scrapping.

[0105] The predicted constant-power capacity is a constant-power capacity obtained by converting a constant-current capacity.

[0106] It can be understood that the predicted constant-power capacity is not an actual constant-power capacity when the target battery is detected in the constant-power mode, but a constant-power capacity obtained by converting a constant-current capacity when the target battery is detected in the constant-current mode.

[0107] In an embodiment, the process of predicting the predicted constant-power capacity of the target battery at the calibration battery temperature when the target battery is detected in the constant-power mode according to the first mapping relationship between the constant-current capacity and the constant-power capacity at the calibration battery temperature and the second constant-current capacity includes:

[0108] determining a capacity conversion coefficient in the first mapping relationship between the constant-current capacity and the constant-power capacity at the calibration battery temperature, wherein the capacity conversion coefficient in the first mapping relationship is determined based on a ratio between an actual constant-power capacity of a battery and a constant-current capacity of the battery at the calibration battery temperature, and the battery has the same battery attribute as the target battery;

[0109] determining the predicted constant-power capacity based on the capacity conversion coefficient in the first mapping relationship and the second constant-current capacity.

[0110] The battery attribute is used to measure the attribute of the battery detected.

[0111] The specific content of the battery attribute can be adjusted according to actual conditions, and the embodiments of the present application are not limited. For example, the battery attribute includes a battery model. For another example, the battery attribute includes, but is not limited to, raw material incoming capacity, particle size, electrode coating surface density and roll thickness, core package (core) weight, primary liquid injection amount and holding capacity.

[0112] Exemplarily, the first mapping relationship can be represented as follows:

[0113] C 0.5P，25℃ = β × C 0.5C，25℃ ;

[0114] wherein 0.5P represents that the charging and discharging power is 50% of the rated power, i.e., the power is constant at half of the rated power. That is, the power used in the constant-power mode is 50% of the rated power. β is a capacity conversion coefficient in the first mapping relationship, and C 0.5C，25℃ is the second constant-current capacity.

[0115] In some embodiments, the capacity conversion method further includes: updating the capacity conversion coefficient in the first mapping relationship when a preset update condition is met; wherein the preset update condition includes that the battery attribute of the battery detected changes, and / or the duration of the capacity detection reaches a preset duration.

[0116] Specifically, in the case that the battery property of the battery for which the capacity detection is performed changes, the actual constant-power capacity of the battery corresponding to the changed battery property is obtained, and the capacity conversion coefficient in the first mapping relationship is updated according to the ratio between the actual constant-power capacity of the battery and the constant-current capacity of the battery at the calibration battery temperature.

[0117] In the case that the duration of the capacity detection reaches the preset duration, if the battery property has not changed, the actual constant-power capacity of the battery corresponding to the battery property for which the capacity detection is performed in the historical time period can be obtained, and the constant-current capacity of the battery at the calibration battery temperature. The historical time period can refer to a time period of a preset duration before the current time. The capacity conversion coefficient in the first mapping relationship is updated according to the ratio between the actual constant-power capacity of the battery and the constant-current capacity of the battery at the calibration battery temperature. In this way, by using the above capacity conversion method, the first constant-current capacity of the target battery is obtained, wherein the first constant-current capacity is used to indicate the capacity obtained by performing capacity detection on the target battery in a constant-current manner; the second constant-current capacity of the target battery at the calibration battery temperature is determined according to the first constant-current capacity; and the predicted constant-power capacity of the target battery at the calibration battery temperature when the capacity detection is performed on the target battery in a constant-power manner is predicted according to the first mapping relationship between the constant-current capacity and the constant-power capacity at the calibration battery temperature and the second constant-current capacity. Based on this, by using the first mapping relationship between the constant-current capacity and the constant-power capacity at the calibration battery temperature, the constant-current capacity of the battery at the calibration battery temperature is converted into the constant-power capacity of the battery at the calibration battery temperature, so as to reduce the conversion cost of the capacity conversion of the battery.

[0118] In order to better understand the above capacity conversion method, a specific embodiment is explained and described below, and the steps of the specific embodiment include:

[0119] The capacity data of a plurality of batteries (such as 10,000 batteries) in a production line during the 08:00-20:00 shift is collected;

[0120] The capacity data is grouped at intervals of 1℃ to obtain a plurality of groups of capacity data.

[0121] The obtained results can include a group of capacity data in which (23℃, 24℃) is located, the group of capacity data including 1532 batteries with an average capacity of 102.3 Ah; a group of capacity data in which (24℃, 25℃) is located, the group of capacity data including 3210 batteries with an average capacity of 103.1 Ah; and a group of capacity data in which (24℃, 25℃) is located, the group of capacity data including 4058 batteries with an average capacity of 103.9 Ah.

[0122] The temperature compensation coefficient in the second mapping relationship is determined based on the multi-component capacity data, and the capacity conversion coefficient in the first mapping relationship is determined.

[0123] For example, if the temperature compensation coefficient α is 0.0035 / ℃, the second mapping relationship includes: C 0.5C，25℃ = C 0.5C，Tavg × [1+0.0035(25-Tavg)].

[0124] For example, if the capacity conversion coefficient β in the first mapping relationship is 1.005, the first mapping relationship includes: C 0.5P，25℃ = 1.005×C 0.5C，25℃ .

[0125] Based on this, in the actual application process, assuming that the target battery temperature of a battery is 24.2℃, the constant-current capacity obtained by detecting the capacity of the battery in a constant-current manner is 103.5 Ah (i.e., the first constant-current capacity).

[0126] Through the second mapping relationship, C 0.5C，25℃ = 103.5×[1+0.0035×(25-24.2)] = 103.8 Ah, that is, the constant-current capacity of the battery at 25℃ (i.e., the calibration battery temperature) is 103.8 Ah (i.e., the second constant-current capacity).

[0127] Through the first mapping relationship, C 0.5P，25℃ = 103.8×1.005 = 104.3 Ah, that is, the predicted constant-power capacity of the battery at 25℃ (i.e., the calibration battery temperature) is 104.3 Ah.

[0128] In this way, through the first mapping relationship and the second mapping relationship, the constant-current capacity of the battery is converted into the constant-power capacity of the battery at the calibration battery temperature, so as to reduce the conversion cost of the capacity conversion of the battery.

[0129] In order to better implement the above method, the embodiment of the application further provides a capacity conversion device, which can be integrated in an electronic device, and the electronic device can be a terminal or a server.

[0130] As shown in Figure 3 , the embodiment of the application further provides a capacity conversion device, and the capacity conversion device includes:

[0131] The capacity acquisition module 201 is configured to acquire the first constant-current capacity of the target battery, wherein the first constant-current capacity is used to indicate the capacity obtained by detecting the capacity of the target battery in a constant-current manner.

[0132] The capacity determination module 202 is configured to determine, according to the first constant-current capacity, a second constant-current capacity of the target battery at the reference battery temperature.

[0133] The capacity conversion module 203 is configured to predict, according to a first mapping relationship between the constant-current capacity and the constant-power capacity at the reference battery temperature and the second constant-current capacity, a predicted constant-power capacity of the target battery at the reference battery temperature when the capacity of the target battery is detected in the constant-power mode.

[0134] In an embodiment, the capacity determination module 202 is configured to determine, according to the first constant-current capacity, the second constant-current capacity of the target battery at the reference battery temperature, including:

[0135] The temperature acquisition unit is configured to acquire a target battery temperature of the target battery in a capacity detection process corresponding to the first constant-current capacity.

[0136] The capacity determination unit is configured to determine, according to a second mapping relationship between the constant-current capacity at the non-reference battery temperature and the constant-current capacity at the reference battery temperature and the target battery temperature and the first constant-current capacity, the second constant-current capacity of the target battery at the reference battery temperature.

[0137] In an embodiment, the target battery temperature includes an average temperature of the target battery at a discharging stage in the capacity detection process.

[0138] In an embodiment, the capacity determination unit is configured to determine, according to the second mapping relationship between the constant-current capacity at the non-reference battery temperature and the constant-current capacity at the reference battery temperature and the target battery temperature and the first constant-current capacity, the second constant-current capacity of the target battery at the reference battery temperature, including:

[0139] The temperature difference calculation sub-unit is configured to calculate a temperature difference between the target battery temperature and the reference battery temperature.

[0140] The coefficient determination sub-unit is configured to determine, according to the temperature difference, a capacity conversion coefficient in the second mapping relationship.

[0141] The capacity determination sub-unit is configured to determine, according to the capacity conversion coefficient in the second mapping relationship and the first constant-current capacity, the second constant-current capacity.

[0142] In an embodiment, the number of the second mapping relationships includes a plurality of second mapping relationships, each of which is configured with a temperature compensation coefficient, and different second mapping relationships correspond to different temperature compensation coefficients.

[0143] Based on this, the capacity conversion device is further configured to:

[0144] determine, from the plurality of second mapping relationships, a target second mapping relationship in which a non-reference battery temperature matching the target battery temperature is located.

[0145] Based on this, the above coefficients determine the sub-unit, and the capacity conversion coefficients in the second mapping relationship are determined according to the temperature difference, including:

[0146] Based on the temperature difference and the temperature compensation coefficient in the target second mapping relationship, determine the capacity conversion coefficient in the target second mapping relationship.

[0147] In one embodiment, before the capacity determination module 202 determines the second constant current capacity of the target battery at the calibrated battery temperature based on the first constant current capacity, the capacity conversion device is further configured to:

[0148] Acquire multiple sets of historical capacity assessment data. Each set of historical capacity assessment data includes the constant current capacity and battery temperature of at least one battery. The battery temperatures of the batteries included in each set of historical capacity assessment data belong to the same battery temperature range, and the batteries included in each set of historical capacity assessment data have the same battery attributes.

[0149] From multiple sets of historical capacity test data, a first set of historical capacity test data for calibration and at least one set of second historical capacity test data are determined, wherein the battery temperature range corresponding to the first historical capacity test data indicates the calibrated battery temperature, and the battery temperature range corresponding to the second historical capacity test data indicates a non-calibrated battery temperature.

[0150] For each set of second historical capacity test data, determine the initial second mapping relationship between the constant current capacity at the non-calibrated battery temperature and the constant current capacity at the calibrated battery temperature corresponding to the second historical capacity test data;

[0151] Based on the first and second historical capacity data, the initial second mapping relationship is fitted to obtain the temperature compensation coefficient.

[0152] Based on the temperature compensation coefficient and the initial second mapping relationship, a second mapping relationship corresponding to the second historical capacity split data is constructed.

[0153] In one embodiment, the capacity conversion device is further configured to:

[0154] Under the condition that the preset update conditions are met, the temperature compensation coefficients in each second mapping relationship are updated;

[0155] The preset update conditions include changes in the battery properties of the battery undergoing capacity testing, and / or, the duration of capacity testing reaches a preset duration.

[0156] In an embodiment, the capacity conversion module 203 is configured to predict the predicted constant power capacity of the target battery at the calibration battery temperature according to the first mapping relationship between the constant current capacity and the constant power capacity at the calibration battery temperature and the second constant current capacity, including:

[0157] a coefficient determination unit configured to determine a capacity conversion coefficient in the first mapping relationship between the constant current capacity and the constant power capacity at the calibration battery temperature, wherein the capacity conversion coefficient in the first mapping relationship is determined based on a ratio between the actual constant power capacity of the battery and the constant current capacity of the battery at the calibration battery temperature, and the battery and the target battery have the same battery attribute;

[0158] a capacity conversion unit configured to determine the predicted constant power capacity based on the capacity conversion coefficient in the first mapping relationship and the second constant current capacity.

[0159] In this way, by using the capacity conversion apparatus, the first constant current capacity of the target battery is obtained by the capacity acquisition module 201, wherein the first constant current capacity is used to indicate the capacity obtained by performing capacity detection on the target battery in a constant current mode; the second constant current capacity of the target battery at the calibration battery temperature is determined by the capacity determination module 202 according to the first constant current capacity; and the predicted constant power capacity of the target battery at the calibration battery temperature is predicted by the capacity conversion module 203 according to the first mapping relationship between the constant current capacity and the constant power capacity at the calibration battery temperature and the second constant current capacity. Based on this, the constant current capacity of the battery at the calibration battery temperature is converted into the constant power capacity of the battery at the calibration battery temperature by using the first mapping relationship between the constant current capacity and the constant power capacity at the calibration battery temperature, so as to reduce the conversion cost of the capacity conversion of the battery.

[0160] The embodiments of the present application further provide an electronic device integrating any of the capacity conversion apparatuses provided by the embodiments of the present application. The electronic device includes:

[0161] one or more processors;

[0162] a memory; and

[0163] one or more application programs, wherein the one or more application programs are stored in the memory and configured to execute the capacity conversion method in any of the capacity conversion method embodiments described above by the processor.

[0164] The embodiments of the present application further provide an electronic device integrating any of the capacity conversion apparatuses provided by the embodiments of the present application. As shown in FIG. 1, a structural schematic diagram of an electronic device related to the embodiments of the present application is shown, specifically: Figure 4 ​

[0165] The electronic device can include a processor 301 having one or more processing cores, a memory 302 having one or more computer readable storage media, a power supply 303, and an input unit 304, etc. Those skilled in the art can understand that Figure 4 The electronic device structure shown in the figure is not a limitation on the electronic device, and can include more or fewer components than shown, or combine certain components, or different component arrangements. Among them:

[0166] The processor 301 is the control center of the electronic device, which connects all parts of the electronic device through various interfaces and lines, executes various functions of the electronic device and processes data by running or executing software programs and / or modules stored in the memory 302, and calling data stored in the memory 302, thereby overall monitoring the electronic device. Optionally, the processor 301 can include one or more processing cores; preferably, the processor 301 can integrate an application processor and a modem processor, wherein the application processor mainly processes the operating system, user interface, and application program, etc., and the modem processor mainly processes wireless communication. It can be understood that the above-mentioned modem processor can also not be integrated into the processor 301.

[0167] The memory 302 can be used to store software programs and modules, and the processor 301 executes various functions and data processing by running the software programs and modules stored in the memory 302. The memory 302 can mainly include a program storage area and a data storage area, wherein the program storage area can store an operating system, at least one application program required by a function (such as an audible and light prompt function, an alarm function, etc.), etc.; the data storage area can store data created according to the use of the electronic device, etc. In addition, the memory 302 can include a high-speed random access memory, and can also include a non-volatile memory, such as at least one magnetic disk storage device, a flash memory device, or other volatile solid-state memory device. Accordingly, the memory 302 can also include a memory controller to provide access for the processor 301 to the memory 302.

[0168] The electronic device also includes a power supply 303 for powering various components, and preferably the power supply 303 can be logically connected to the processor 301 through a power management system, so as to realize the functions of managing charging, discharging, and power consumption management, etc. through the power management system. The power supply 303 can also include one or more direct current or alternating current power supplies, a recharging system, a power supply failure detection circuit, a power supply converter or inverter, a power supply state indicator, etc. any component.

[0169] The electronic device may also include an input unit 304, which can be used to receive input digital or character information and generate keyboard, mouse, joystick, optical or trackball signal inputs related to user settings and function control.

[0170] Although not shown, the electronic device may also include a display unit, etc., which will not be described in detail here. Specifically, in this embodiment, the processor 301 in the electronic device loads the executable files corresponding to the processes of one or more applications into the memory 302 according to the following instructions, and the processor 301 runs the applications stored in the memory 302 to realize various functions, as follows:

[0171] Obtain the first constant current capacity of the target battery, wherein the first constant current capacity is used to indicate the capacity obtained by performing capacity detection on the target battery using a constant current method;

[0172] Based on the first constant current capacity, determine the second constant current capacity of the target battery at the calibrated battery temperature;

[0173] Based on the first mapping relationship between constant current capacity and constant power capacity at the calibrated battery temperature, and the second constant current capacity, the predicted constant power capacity of the target battery at the calibrated battery temperature is predicted when the target battery is tested using the constant power method.

[0174] Those skilled in the art will understand that all or part of the steps in the various methods of the above embodiments can be performed by instructions, or by instructions controlling related hardware. These instructions can be stored in a computer-readable storage medium and loaded and executed by a processor.

[0175] Therefore, embodiments of this application provide a computer-readable storage medium, which may include: read-only memory (ROM), random access memory (RAM), a magnetic disk, or an optical disk, etc. A computer program is stored thereon, which is loaded by a processor to execute the steps in any of the capacity conversion methods provided in embodiments of this application. For example, the computer program loaded by the processor can execute the following steps:

[0176] Obtain the first constant current capacity of the target battery, wherein the first constant current capacity is used to indicate the capacity obtained by performing capacity detection on the target battery using a constant current method;

[0177] Based on the first constant current capacity, determine the second constant current capacity of the target battery at the calibrated battery temperature;

[0178] According to the first mapping relationship between the constant-current capacity and the constant-power capacity at the calibration battery temperature and the second constant-current capacity, a predicted constant-power capacity of the target battery at the calibration battery temperature is predicted when the target battery is detected in the constant-power mode.

[0179] The embodiments of the present application further provide a computer program product, comprising computer programs / instructions, which are executed by a processor to perform the steps in any of the capacity conversion methods provided by the embodiments of the present application.

[0180] In the above embodiments, the description of each embodiment has its own focus, and the parts not described in detail in a certain embodiment can be referred to the detailed description of other embodiments above, which will not be described here again.

[0181] In the implementation, the above units or structures can be implemented as independent entities, or can be combined as the same or several entities, and the specific implementation of the above units or structures can be referred to the method embodiments above, which will not be described here again.

[0182] The embodiments of the present application are described in detail above, and the principle and implementation manner of the present application are described by applying specific examples; the above embodiment descriptions are only used to help understand the method of the present application and its core idea; meanwhile, for those skilled in the art, the specific implementation manner and application range can be changed according to the idea of the present application, and the above description should not be understood as the limitation of the present application.

Claims

1. A capacity conversion method, characterized in that, The method includes: Obtain the first constant current capacity of the target battery, wherein the first constant current capacity is used to indicate the capacity obtained by performing capacity detection on the target battery using a constant current method; Based on the first constant current capacity, determine the second constant current capacity of the target battery at the calibrated battery temperature; Based on the first mapping relationship between constant current capacity and constant power capacity at the calibrated battery temperature, and the second constant current capacity, the predicted constant power capacity of the target battery at the calibrated battery temperature is predicted when the target battery is tested for capacity using a constant power method.

2. The capacity conversion method according to claim 1, characterized in that, The step of determining the second constant current capacity of the target battery at the calibrated battery temperature based on the first constant current capacity includes: During the capacity detection process corresponding to the first constant current capacity, the target battery temperature of the target battery is obtained; Based on the second mapping relationship between the constant current capacity at the non-calibrated battery temperature and the constant current capacity at the calibrated battery temperature, and the target battery temperature and the first constant current capacity, the second constant current capacity of the target battery at the calibrated battery temperature is determined.

3. The capacity conversion method according to claim 2, characterized in that, The target battery temperature includes the average temperature of the target battery during the discharge phase of the capacity test.

4. The capacity conversion method according to claim 2, characterized in that, The step of determining the second constant current capacity of the target battery at the calibrated battery temperature based on the second mapping relationship between the constant current capacity at the non-calibrated battery temperature and the constant current capacity at the calibrated battery temperature, and the target battery temperature and the first constant current capacity, includes: Calculate the temperature difference between the target battery temperature and the calibrated battery temperature; Based on the temperature difference, determine the capacity conversion coefficient in the second mapping relationship; The second constant current capacity is determined based on the capacity conversion coefficient in the second mapping relationship and the first constant current capacity.

5. The capacity conversion method according to claim 4, characterized in that, The number of the second mapping relationships includes multiple types, each of which is configured with a temperature compensation coefficient, and different second mapping relationships correspond to different temperature compensation coefficients; the method further includes: From a plurality of second mapping relationships, determine the target second mapping relationship in which the non-calibrated battery temperature matches the target battery temperature; Determining the capacity conversion coefficient in the second mapping relationship based on the temperature difference includes: Based on the temperature difference and the temperature compensation coefficient in the target second mapping relationship, the capacity conversion coefficient in the target second mapping relationship is determined.

6. The capacity conversion method according to claim 5, characterized in that, Before determining the second constant current capacity of the target battery at the calibrated battery temperature based on the first constant current capacity, the method further includes: Multiple sets of historical capacity assessment data are acquired, wherein each set of historical capacity assessment data includes the constant current capacity and battery temperature of at least one battery, the battery temperature of the batteries included in each set of historical capacity assessment data belongs to the same battery temperature range, and the batteries included in each set of historical capacity assessment data have the same battery attributes. From multiple sets of historical capacity test data, a first set of historical capacity test data for calibration and at least one set of second historical capacity test data are determined, wherein the battery temperature range corresponding to the first historical capacity test data indicates the calibrated battery temperature, and the battery temperature range corresponding to the second historical capacity test data indicates a non-calibrated battery temperature. For each set of the second historical capacity breakdown data, an initial second mapping relationship is determined between the constant current capacity at the non-calibrated battery temperature and the constant current capacity at the calibrated battery temperature corresponding to the second historical capacity breakdown data. Based on the first historical capacity data and the second historical capacity data, the initial second mapping relationship is fitted to obtain the temperature compensation coefficient; Based on the temperature compensation coefficient and the initial second mapping relationship, a second mapping relationship corresponding to the second historical capacity split data is constructed.

7. The capacity conversion method according to claim 6, characterized in that, The method further includes: Under the condition that the preset update conditions are met, the temperature compensation coefficient in each of the second mapping relationships is updated; The preset update conditions include changes in the battery properties of the battery undergoing capacity testing, and / or the duration of capacity testing reaching a preset duration.

8. The capacity conversion method according to any one of claims 1 to 7, characterized in that, The step of predicting the predicted constant power capacity of the target battery at the calibrated battery temperature when the target battery is subjected to capacity testing using a constant power method, based on the first mapping relationship between the constant current capacity and the constant power capacity at the calibrated battery temperature, and the second constant current capacity, includes: Determine the capacity conversion coefficient in the first mapping relationship between the constant current capacity and the constant power capacity at the calibrated battery temperature, wherein the capacity conversion coefficient in the first mapping relationship is determined based on the ratio between the actual constant power capacity of the battery and the constant current capacity of the battery at the calibrated battery temperature, and the battery has the same battery properties as the target battery; The predicted constant power capacity is determined based on the capacity conversion coefficient in the first mapping relationship and the second constant current capacity.

9. An electronic device, characterized in that, It includes a memory and a processor; the memory stores an application program, and the processor is used to run the application program within the memory to perform the steps in the capacity conversion method according to any one of claims 1 to 8.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program that is executed by a processor to implement the steps of the capacity conversion method according to any one of claims 1 to 8.

Images