Battery storage test method and system
By testing the RPT test conditions in the energy storage battery storage procedure, the problem of low DCR testing accuracy in existing technologies is solved, and the accurate assessment and reduction of the capacity attenuation of the capacity of the energy storage battery is realized.
Patent Information
- Application Number
- CN202411406260.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-09
- Publication Date
- 2025-01-28
AI Technical Summary
In the long-term storage tests of existing energy storage batteries, the DCR test accuracy is low, which can easily cause battery capacity damage and affect battery capacity attenuation.
By obtaining the current environmental temperature of the battery to be measured by the presetting time value, the RPT testing conditions are selected according to the ambient temperature, and the battery test is performed to obtain the target DCR data.
In the long -term storage test process of energy storage batteries, the DCR of the energy storage battery is accurately tested, the impact of the battery performance is reduced, the accuracy of testing is improved, and the battery capacity attenuation is reduced.
Smart Images
Figure CN119375728A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of battery technology, and in particular to a battery storage testing method and system. Background Art
[0002] The long-term storage test of the energy storage battery includes the charge and discharge cycle test process, such as placing the energy storage battery for a preset time, discharge test, placing it for a preset time, charge test and placing it for a preset time, to explore the storage aging performance of the energy storage battery at different temperatures.
[0003] In the existing long-term storage test of energy storage batteries, the DCR test accuracy of the energy storage batteries is low, and it is easy to cause damage to the battery capacity and have a great impact on the battery capacity attenuation. Summary of the invention
[0004] Based on this, a battery storage testing method and system are provided.
[0005] In a first aspect, the present application provides a battery storage test method, comprising the following steps:
[0006] When the storage time reaches a preset time value, the current ambient temperature of the corresponding battery to be tested is obtained;
[0007] Select the RPT test conditions according to the current ambient temperature, and perform the RPT test on the battery to be tested based on the RPT test conditions to obtain the target DCR data.
[0008] In one embodiment, the steps of selecting RPT test conditions according to the current ambient temperature, performing RPT test on the battery to be tested based on the RPT test conditions, and obtaining target DCR data include:
[0009] When the current ambient temperature reaches a first temperature range value, selecting a first RPT test condition, and performing a first RPT test on the battery to be tested based on the first RPT test condition to obtain first test data;
[0010] Perform a second RPT test on the battery to be tested based on the second RPT test condition to obtain second test data;
[0011] Target DCR data is obtained according to the first test data and the second test data.
[0012] In one embodiment, the step of performing a first RPT test on the battery to be tested based on the first RPT test condition to obtain first test data includes:
[0013] When the test temperature reaches a first temperature threshold, energy detection is performed on the battery to be tested based on a first preset multiple to obtain first initial capacity data;
[0014] Perform a DCR test on the battery to be tested based on the second preset rate and the first preset SOC to obtain first DCR data;
[0015] Performing energy detection on the battery to be tested based on a third preset rate to obtain first end capacity data; the third preset rate is less than the first preset rate;
[0016] First test data is obtained according to the first initial capacity data, the first DCR data and the first end capacity data.
[0017] In one embodiment, the step of performing a DCR test on the battery to be tested based on the second preset rate and the first preset SOC to obtain the first DCR data includes:
[0018] The battery to be tested is left for a first preset time;
[0019] The step of performing a DCR test on the battery to be tested based on the second preset rate and the first preset SOC and obtaining first DCR data includes:
[0020] Based on the first preset SOC range, the first SOC step value and the first preset interval time, the DCR test is performed at least twice on the battery to be tested under the second preset rate condition to obtain first DCR data.
[0021] In one embodiment, the step of performing energy detection on the battery to be tested based on the first preset rate to obtain first initial capacity data includes:
[0022] Based on a first preset discharge rate and a first preset charge rate, energy detection is performed on the battery to be tested to obtain first initial capacity data; the value of the first preset discharge rate is greater than the value of the first preset charge rate;
[0023] The step of performing energy detection on the battery to be tested based on the third preset rate and obtaining first end capacity data includes:
[0024] Energy detection is performed on the battery to be tested based on the third preset discharge rate and the third preset charge rate to obtain first end capacity data; the value of the third preset discharge rate is equal to the third preset charge rate.
[0025] In one embodiment, the step of performing a second RPT test on the battery to be tested based on the second RPT test condition to obtain second test data includes:
[0026] When the test temperature reaches a second temperature threshold, energy detection is performed on the battery to be tested based on a fourth preset multiple to obtain second capacity data;
[0027] Performing a DCR test on the battery to be tested based on a fifth preset magnification and a second preset SOC to obtain second DCR data;
[0028] Second test data is obtained according to the second capacity data and the second DCR data.
[0029] In one embodiment, the step of performing a DCR test on the battery to be tested based on the fifth preset rate and the second preset SOC to obtain the second DCR data includes:
[0030] When the test temperature reaches a third temperature threshold, a DCR test is performed on the battery to be tested based on a sixth preset rate and a third preset SOC to obtain third DCR data;
[0031] The step of obtaining second test data according to the second capacity data and the second DCR data includes:
[0032] Second test data is obtained according to the second capacity data, the second DCR data and the third DCR data.
[0033] In one embodiment, when the test temperature reaches the second temperature threshold, the step of performing energy detection on the battery to be tested based on a fourth preset rate to obtain second capacity data includes:
[0034] When the test temperature reaches a second temperature threshold, placing the battery under test on hold for a second preset time;
[0035] Based on the fourth preset discharge rate and the fourth preset charge rate, energy detection is performed on the battery to be tested to obtain second capacity data.
[0036] In one embodiment, the step of performing a DCR test on the battery to be tested based on the fifth preset rate and the second preset SOC to obtain the second DCR data includes:
[0037] The battery to be tested is left for a third preset time;
[0038] The step of performing a DCR test on the battery to be tested based on the fifth preset rate and the second preset SOC to obtain second DCR data includes:
[0039] Based on the second preset SOC range, the second SOC step value and the second preset interval time, the DCR test is performed at least twice on the battery to be tested under the fifth preset rate condition to obtain second DCR data.
[0040] In one embodiment, when the test temperature reaches a third temperature threshold, a DCR test is performed on the battery to be tested based on a sixth preset rate and a third preset SOC, and the step of obtaining third DCR data includes:
[0041] When the test temperature reaches a third temperature threshold, placing the battery under test for a fourth preset time;
[0042] A DCR test is performed on the battery to be tested under conditions of a sixth preset discharge rate and a sixth preset charge rate based on the third preset SOC to obtain third DCR data.
[0043] In one embodiment, the step of performing a DCR test on the battery to be tested under the conditions of a sixth preset discharge rate and a sixth preset charge rate based on the third preset SOC to obtain third DCR data includes:
[0044] Based on the third preset SOC range, the third SOC step value and the third preset interval time, the DCR test is performed at least twice on the battery to be tested under the conditions of a sixth preset discharge rate and a sixth preset charge rate to obtain third DCR data.
[0045] In one embodiment, the step of obtaining target DCR data according to the first test data and the second test data includes:
[0046] Obtaining target capacity data according to the first test data and the second test data;
[0047] According to the target DCR data and the target capacity data, a DCR and capacity curve is established.
[0048] In a second aspect, the present application provides a battery storage test system, including a processing device, the processing device being connected to a battery to be tested;
[0049] The processing device is used to execute the steps of any one of the above-mentioned battery storage test methods.
[0050] One of the above technical solutions has the following advantages and beneficial effects:
[0051] In the above-mentioned battery storage test method, when the storage time reaches a preset time value, the current ambient temperature of the corresponding battery to be tested is obtained; RPT test conditions are selected according to the current ambient temperature, and RPT test is performed on the battery to be tested based on the RPT test conditions to obtain target DCR data, thereby achieving accurate DCR testing of the energy storage battery during the long-term storage test of the energy storage battery. The present application obtains accurate target DCR data by regularly testing the battery to be tested based on a preset time value during the storage process of the battery to be tested, and selecting corresponding RPT test conditions according to the current ambient temperature, and then performing RPT test on the battery to be tested based on the corresponding RPT test conditions, while reducing the impact on battery performance, improving the accuracy of DCR testing of energy storage batteries, and reducing the impact on battery capacity attenuation. BRIEF DESCRIPTION OF THE DRAWINGS
[0052] Figure 1 This is a schematic diagram of an application scenario of the battery storage test method in an embodiment of the present application;
[0053] Figure 2 This is a schematic diagram of a first process of a battery storage test method in an embodiment of the present application;
[0054] Figure 3 This is a second flow chart of the battery storage test method in an embodiment of the present application;
[0055] Figure 4 This is a flow chart of the first test data acquisition step in the embodiment of the present application;
[0056] Figure 5 This is a flow chart of the second test data acquisition step in the embodiment of the present application;
[0057] Figure 6 This is a flow chart of the second capacity data acquisition step in the embodiment of the present application;
[0058] Figure 7 This is a flow chart of the third DCR data acquisition step in the embodiment of the present application;
[0059] Figure 8 Schematic diagram of the process steps of a normal temperature DCR test of a battery storage test method in an embodiment of the present application;
[0060] Fig. 9 This is a schematic diagram of the process steps of a high temperature DCR test of a battery storage test method in an embodiment of the present application;
[0061] Fig.10 A schematic diagram of the process steps of a low-temperature DCR test of a battery storage test method in an embodiment of the present application;
[0062] Fig.11 Schematic diagram of the structure of the battery storage test system in the embodiment of the present application. DETAILED DESCRIPTION
[0063] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.
[0064] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.
[0065] In addition, the term "plurality" shall mean two or more.
[0066] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.
[0067] The battery storage test method provided in this application can be applied to Figure 1 In the application environment shown. Among them, the test equipment may include a processor 102 and a memory 104, and the memory 104 may be used to store the current ambient temperature and the target DCR data, etc. The processor 102 may be used to obtain the current ambient temperature of the corresponding battery to be tested when the storage time reaches a preset time value; select the RPT test conditions according to the current ambient temperature, and perform the RPT test on the battery to be tested based on the RPT test conditions to obtain the target DCR data. The processing device may also include a display 106, and the display 106 may display the current ambient temperature and the target DCR data, etc. through a graphical interface. Exemplarily, the test equipment may be a test fixture and a test device, the test device is connected to the processor, the test fixture is used to fix the battery to be tested, the test device is used to control the charge and discharge of the battery to be tested, and the test device is also used to collect the temperature data and electrical signal data of the battery to be tested.
[0068] In one embodiment, Figure 2 As shown, a battery storage test method is provided, which is applied to Figure 1 The processor 102 in the embodiment is taken as an example to illustrate, and the following steps are included:
[0069] Step S210, when the storage time reaches a preset time value, the current ambient temperature of the corresponding battery to be tested is obtained.
[0070] Among them, the battery to be tested can be a long-cycle or long-storage energy storage battery, and the battery to be tested can be a regular shape structure such as a square or a circle. It should be noted that the battery to be tested can also be an irregular shape structure. The battery to be tested can be a lithium-ion battery. For example, the battery to be tested can be a lithium iron phosphate battery, a ternary battery, or a lithium iron manganese battery. Exemplarily, the battery to be tested may include a plurality of single cells, and each single cell can be connected in series and / or in parallel; in another example, the battery to be tested may consist of a single single cell.
[0071] The storage time refers to the cumulative storage time of the battery to be tested, and the preset time value may be one month, two months, half a year or one year, etc. Exemplarily, the preset time value may also be set with a dynamic time value, for example, when the storage time of the battery to be tested is less than 1 year, the preset time value is one month or two months; when the storage time of the battery to be tested is greater than 1 year and less than 3 years, the preset time value is half a year; when the storage time of the battery to be tested is greater than 3 years and less than 5 years, the preset time value is one year.
[0072] The current ambient temperature refers to the ambient temperature of the environment in which the battery to be tested is stored. For example, the ambient temperature of the environment in which the battery to be tested is stored can be collected in real time through temperature acquisition, thereby obtaining the current ambient temperature of the corresponding battery to be tested.
[0073] Step S220, selecting RPT test conditions according to the current ambient temperature, and performing RPT test on the battery to be tested based on the RPT test conditions to obtain target DCR data.
[0074] Among them, RPT (Reference Performance Test) is a method for evaluating battery characteristics. The RPT test can be used to obtain performance indicators such as battery capacity and DCR (Direct Current Resistance) of the battery to be tested. The RPT test conditions can be obtained by presetting the corresponding test temperature, charge and discharge rate, test SOC and test time. The RPT test refers to the RPT test of the battery to be tested under the corresponding RPT test conditions.
[0075] Different current temperature environments can select different RPT test conditions, and the specific test parameters of different RPT test conditions are different; it should be noted that the test parameters can be, but are not limited to, test temperature, charge and discharge rate, and test time. For example, the RPT test conditions corresponding to three temperature ranges can be divided. When the current temperature environment is a normal temperature range, the first RPT test condition is selected; when the current temperature environment is a high temperature range, the second RPT test condition is selected; when the current temperature environment is a low temperature range, the third RPT test condition is selected.
[0076] Exemplarily, a mapping relationship table between ambient temperature and RPT test conditions can be established in advance, and the mapping relationship table can be queried based on the current ambient temperature obtained, and then the corresponding RPT test conditions can be selected, and the RPT test can be performed on the battery to be tested based on the RPT test conditions to obtain the DCR data of the battery to be tested during long-term storage, thereby accurately testing the DCR under the corresponding RPT test conditions.
[0077] In the above embodiment, when the storage time reaches the preset time value, the current ambient temperature of the corresponding battery to be tested is obtained; RPT test conditions are selected according to the current ambient temperature, and RPT test is performed on the battery to be tested based on the RPT test conditions to obtain target DCR data, thereby achieving accurate DCR test of the energy storage battery during the long-term storage test of the energy storage battery. The present application tests the battery to be tested regularly based on the preset time value during the storage process of the battery to be tested, and selects the corresponding RPT test conditions according to the current ambient temperature, and then performs RPT test on the battery to be tested based on the corresponding RPT test conditions to obtain accurate target DCR data, thereby reducing the test time, reducing the impact on battery performance, improving the DCR test accuracy of the energy storage battery, and reducing the impact on battery capacity attenuation.
[0078] In one embodiment, Figure 3 As shown, a battery storage test method is provided, which is applied to Figure 1 The processor 102 in the embodiment is taken as an example to illustrate, and the following steps are included:
[0079] Step S310, when the storage time reaches a preset time value, the current ambient temperature of the corresponding battery to be tested is obtained.
[0080] For the specific description of the above step S310, please refer to the description of the above embodiment, which will not be repeated here.
[0081] Step S320, when the current ambient temperature reaches a first temperature range value, a first RPT test condition is selected, and a first RPT test is performed on the battery to be tested based on the first RPT test condition to obtain first test data.
[0082] Among them, the first temperature range value may be a normal temperature range value, and the first RPT test condition is an RPT test condition corresponding to the normal temperature range value. The first RPT test condition can be obtained by presetting the corresponding test temperature, charge and discharge rate, test SOC and test time. The first RPT test refers to performing an RPT test on the battery to be tested under the first RPT test condition. The first test data may include DCR data obtained in the first test; exemplarily, the first test data may also include data such as battery power and battery capacity obtained in the first test.
[0083] Exemplarily, the storage time of the battery to be tested can be monitored. When the storage time of the battery to be tested reaches a preset time value, a Multi-RPT test of the battery to be tested is started, and then the current ambient temperature of the corresponding battery to be tested is obtained, and the current ambient temperature is compared with the preset temperature range. When the current ambient temperature reaches the first temperature range value, a first RPT test condition is selected, and a first RPT test is performed on the battery to be tested based on the first RPT test condition to obtain first test data, thereby realizing the first RPT test of this round of storage test of the battery to be tested.
[0084] Step S330, performing a second RPT test on the battery to be tested based on the second RPT test condition to obtain second test data.
[0085] Among them, the second RPT test condition can be obtained by presetting the corresponding test temperature, charge and discharge rate, test SOC and test time. It should be noted that the second RPT test condition is different from the first RPT test condition. The second RPT test refers to performing an RPT test on the battery to be tested under the second RPT test condition. The second test data may include the DCR data obtained from the second test; illustratively, the second test data may also include data such as the battery power and battery capacity obtained from the second test.
[0086] Exemplarily, when the battery to be tested is undergoing this round of storage testing, if the first RPT test is completed, the second RPT test conditions are selected, and the second RPT test is performed on the battery to be tested based on the second RPT test conditions to obtain second test data, thereby implementing the second RPT test of this round of storage testing of the battery to be tested.
[0087] Step S340: Obtain target DCR data according to the first test data and the second test data.
[0088] By analyzing the first test data and the second test data, the target DCR data of the storage battery to be tested at the corresponding storage time is obtained, and the accurate DCR change data of the battery to be tested during the long-term storage process can be obtained.
[0089] For example, the target DCR data may include first target DCR data corresponding to a first RPT test condition and second target DCR data corresponding to a second RPT test condition, so as to accurately test the corresponding DCR under different RPT test conditions.
[0090] In the above-mentioned embodiment, during the storage process of the battery to be tested, the battery to be tested is tested periodically based on a preset time value, and according to the current ambient temperature, when the current ambient temperature reaches a first temperature range value, the first RPT test condition is selected to perform the first RPT test, and after the first RPT test is completed, the second RPT test condition is selected to perform the second RPT test, and then according to the first test data and the second test data obtained by the test, accurate target DCR data is obtained, and by first selecting the first RPT test condition matching the current ambient temperature for the RPT test, the test time is reduced, and the impact on the battery performance is reduced, and by performing the RPT test on the battery to be tested twice under different RPT test conditions, the DCR test accuracy of the energy storage battery is improved, and the impact on the battery capacity attenuation is reduced.
[0091] In one example, if the current ambient temperature reaches a second temperature range value, a second RPT test condition is selected, and a second RPT test is performed on the battery to be tested based on the second RPT test condition to obtain second test data; after completing the second RPT test, a first RPT test is performed on the battery to be tested based on the first RPT test condition to obtain first test data, and then the target DCR data is obtained based on the first test data and the second test data.
[0092] The second temperature range value may be a low temperature range value or a high temperature range value. The second RPT test condition is an RPT test condition corresponding to the low temperature range value or the high temperature range value.
[0093] Exemplarily, the storage time of the battery to be tested can be monitored. When the storage time of the battery to be tested reaches a preset time value, the Multi-RPT test of the battery to be tested is started, and the current ambient temperature of the corresponding battery to be tested is obtained, and the current ambient temperature is compared with the preset temperature range. When the current ambient temperature reaches the second temperature range value, the second RPT test condition is selected, and the second RPT test is performed on the battery to be tested based on the second RPT test condition to obtain the second test data, thereby realizing the first RPT test of the current round of storage test of the battery to be tested. When the battery to be tested is undergoing the current round of storage test, if the second RPT test is completed, the first RPT test condition is selected, and the first RPT test is performed on the battery to be tested based on the first RPT test condition to obtain the first test data, thereby realizing the second RPT test of the current round of storage test of the battery to be tested. By analyzing and processing the first test data and the second test data, the target DCR data of the storage battery to be tested at the corresponding storage time is obtained, thereby reducing the impact on battery performance, improving the accuracy of the DCR test of the energy storage battery, and reducing the impact on battery capacity attenuation.
[0094] In one embodiment, Figure 4As shown, the steps of performing a first RPT test on the battery to be tested based on the first RPT test condition to obtain first test data include:
[0095] Step S410: When the test temperature reaches a first temperature threshold, energy detection is performed on the battery to be tested based on a first preset multiple to obtain first initial capacity data.
[0096] The test temperature may be the temperature of the battery test environment, for example, the test temperature is the temperature of the test incubator. The first temperature threshold may be obtained according to system presets, and the first temperature threshold is a normal temperature threshold, such as the first temperature threshold is set to 25°C. Exemplarily, the battery to be tested may be placed in the test incubator, and the test temperature may be adjusted to reach the first temperature threshold by adjusting the temperature of the test incubator.
[0097] The first preset rate may include a charging rate and a discharging rate, and the first preset rate may be obtained according to a system preset. Energy detection refers to performing a cycle test on the battery to be tested, thereby obtaining capacity data of the battery to be tested. The first initial capacity data refers to the available capacity data obtained by performing energy detection on the battery to be tested based on the first preset rate.
[0098] Step S420: Perform a DCR test on the battery to be tested based on the second preset rate and the first preset SOC to obtain first DCR data.
[0099] Among them, the second preset rate may include a corresponding charging rate and a discharging rate, and the second preset rate may be obtained according to the system preset. The first preset SOC may be 10% SOC, 20% SOC, 50% SOC or 90% SOC, etc. The DCR test refers to a DCR test of the battery to be tested at different SOCs. Exemplarily, the DCR test may be a DCR / SOC test method based on the national standard method. The first DCR data refers to the DCR data under the corresponding SOC obtained by performing a DCR test on the battery to be tested based on the second preset rate and the first preset SOC.
[0100] Step S430, performing energy detection on the battery to be tested based on a third preset rate to obtain first end capacity data; the third preset rate is smaller than the first preset rate.
[0101] The third preset rate may include a corresponding charging rate and a discharging rate, and the third preset rate may be obtained according to a system preset, and the third preset rate is less than the first preset rate. The first end capacity data refers to the available capacity data obtained by performing energy detection on the battery to be tested based on the third preset rate. The battery to be tested is charged and discharged at a small rate according to the third preset rate to detect the energy of the battery to be tested, and then the first end capacity data is obtained according to the detection result.
[0102] Step S440, obtaining first test data according to the first initial capacity data, the first DCR data and the first end capacity data.
[0103] For example, the first initial capacity data, the first DCR data, and the first end capacity data may be processed graphically to obtain a test graph corresponding to the first test data. For another example, the first initial capacity data, the first DCR data, and the first end capacity data may be processed in a tabular form to obtain a data table corresponding to the first test data.
[0104] In the above embodiment, when the test temperature reaches the first temperature threshold, an initial energy test is performed on the battery to be tested based on a first preset rate, a DCR test is performed based on a second preset rate and a first preset SOC, and an energy test is ended based on a third preset rate, thereby accurately obtaining the first test data while reducing the impact on the performance of the battery to be tested.
[0105] In one example, the step of performing a DCR test on the battery to be tested based on the second preset rate and the first preset SOC and obtaining the first DCR data includes:
[0106] The battery to be tested is left for a first preset time.
[0107] The first preset time may be obtained according to a system preset, for example, the first preset time may be set to 1 hour.
[0108] By placing the battery to be tested on hold for a first preset time before the DCR test of the battery to be tested, the temperature of the battery to be tested can be kept constant to the test temperature, so that the voltage of the battery to be tested is stable at this temperature, and then the battery temperature and voltage of the battery to be tested reach a balanced state, thereby improving the accuracy of the DCR test when the DCR test is performed on the battery to be tested.
[0109] In one embodiment, the step of performing a DCR test on the battery to be tested based on the second preset rate and the first preset SOC to obtain first DCR data includes:
[0110] Based on the first preset SOC range, the first SOC step value and the first preset interval time, the DCR test is performed at least twice on the battery to be tested under the second preset rate condition to obtain first DCR data.
[0111] Among them, the first preset SOC range, the first SOC step value and the first preset interval time can be obtained according to system preset.
[0112] For example, the first preset SOC range can be set to 10% SOC to 90% SOC, the first SOC step value can be set to 10% SOC, the first preset interval time can be set to 5 minutes, and the second preset rate can be set to 0.5 C. That is, at a charge and discharge rate of 0.5 C, each pulse discharge (or pulse charge) interval is left for 5 minutes, and within the range of 10% SOC to 90% SOC, a DCR test is performed every 10% SOC, thereby obtaining accurate first DCR data through testing.
[0113] In one embodiment, when the test temperature reaches a first temperature threshold, the step of performing energy detection on the battery to be tested based on a first preset rate to obtain first initial capacity data includes:
[0114] Based on the first preset discharge rate and the first preset charge rate, energy detection is performed on the battery to be tested to obtain first initial capacity data; the value of the first preset discharge rate is greater than the value of the first preset charge rate.
[0115] Among them, the first preset discharge rate can be set to be greater than the first preset charge rate.
[0116] For example, the first preset discharge rate is 0.5C, the first preset charge rate is 0.25C, and the first temperature threshold is 25°C. When the test temperature reaches 25°C, the battery to be tested is charged at a rate of 0.25C, discharged at a rate of 0.5C, and charged at a rate of 0.25C in sequence, and energy detection is performed on the battery to be tested to obtain the first initial capacity data.
[0117] In one example, the step of performing energy detection on the battery to be tested based on the third preset rate to obtain first end capacity data includes:
[0118] Energy detection is performed on the battery to be tested based on the third preset discharge rate and the third preset charge rate to obtain first end capacity data; the value of the third preset discharge rate is equal to the third preset charge rate.
[0119] The third preset discharge rate can be set to be equal to the third preset charge rate. The third preset discharge rate is smaller than the first preset charge rate, and the third preset charge rate is smaller than the first preset charge rate.
[0120] For example, the third preset discharge rate and the third preset charge rate are both set to 0.05C rate. When the DCR test in the first RPT test step is completed for the battery to be tested, a small rate energy detection is then performed on the battery to be tested, that is, the battery to be tested is sequentially charged at a rate of 0.05C and discharged at a rate of 0.05C, and energy detection is performed on the battery to be tested, and then the second end capacity data is detected, so that the first test data can be accurately obtained, while reducing the performance impact of the battery to be tested.
[0121] In one embodiment, Figure 5 As shown, the steps of performing a second RPT test on the battery to be tested based on the second RPT test condition and obtaining second test data include:
[0122] Step S510: When the test temperature reaches a second temperature threshold, energy detection is performed on the battery to be tested based on a fourth preset multiple to obtain second capacity data.
[0123] The second temperature threshold can be obtained according to system presets, and the second temperature threshold is a high temperature threshold, such as the second temperature threshold is set to 40° C. Exemplarily, the battery to be tested can be placed in a test incubator, and the test temperature can be adjusted to reach the second temperature threshold.
[0124] The fourth preset rate may include a charging rate and a discharging rate, and the fourth preset rate may be obtained according to system presets. The second initial capacity data refers to the available capacity data obtained by performing energy detection on the battery to be tested based on the fourth preset rate.
[0125] Step S520: Perform a DCR test on the battery to be tested based on the fifth preset rate and the second preset SOC to obtain second DCR data.
[0126] Among them, the fifth preset rate may include a corresponding charging rate and a discharging rate, and the fifth preset rate may be obtained according to the system preset. The second preset SOC may be 10% SOC, 30% SOC, 50% SOC or 90% SOC, etc. The second DCR data refers to the DCR data under the corresponding SOC obtained by performing a DCR test on the battery to be tested based on the fifth preset rate and the second preset SOC.
[0127] Step S530: obtaining second test data according to the second capacity data and the second DCR data.
[0128] For example, the second capacity data and the second DCR data may be processed graphically to obtain a test graph corresponding to the second test data. For another example, the second capacity data and the second DCR data may be processed in a tabular form to obtain a data table corresponding to the second test data.
[0129] In the above embodiment, when the test temperature reaches the second temperature threshold, an energy test is performed on the battery to be tested based on the fourth preset rate, and a DCR test is performed based on the fifth preset rate and the second preset SOC, so that the second test data can be accurately obtained, and the DCR test of the battery to be tested under different temperature conditions is realized, which eliminates the interference of working conditions before the test, reduces the impact on the performance of the battery to be tested, and improves the accuracy of the DCR test of the battery to be tested.
[0130] In one embodiment, the step of performing a DCR test on the battery to be tested based on the fifth preset rate and the second preset SOC to obtain the second DCR data includes:
[0131] When the test temperature reaches the third temperature threshold, a DCR test is performed on the battery to be tested based on a sixth preset rate and a third preset SOC to obtain third DCR data.
[0132] The third temperature threshold can be obtained according to system presets, and the third temperature threshold is a low temperature threshold, such as the third temperature threshold is set to 0° C. Exemplarily, the battery to be tested can be placed in a test incubator, and the test temperature can be adjusted to reach the third temperature threshold.
[0133] The sixth preset rate may include a corresponding charging rate and a discharging rate, and the sixth preset rate may be obtained according to the system preset. The third preset SOC may be 10% SOC, 30% SOC, 50% SOC or 90% SOC, etc. The third DCR data refers to the DCR data at the corresponding SOC obtained by performing a DCR test on the battery to be tested based on the sixth preset rate and the third preset SOC.
[0134] In one example, the step of obtaining the second test data according to the second capacity data and the second DCR data includes:
[0135] Second test data is obtained according to the second capacity data, the second DCR data and the third DCR data.
[0136] For example, the second capacity data, the second DCR data, and the third DCR data may be processed graphically to obtain a test graph corresponding to the second test data. For another example, the second capacity data, the second DCR data, and the third DCR data may be processed in a tabular form to obtain a data table corresponding to the second test data.
[0137] In the above embodiment, when the test temperature reaches the third temperature threshold, a DCR test is performed based on the sixth preset ratio and the third preset SOC, so that the third DCR data can be accurately obtained, and the second capacity data, the second DCR data and the third DCR data are integrated and processed to obtain the second test data, thereby realizing the DCR test of the battery to be tested under different temperature conditions, eliminating the interference of the working conditions before the test, reducing the impact on the performance of the battery to be tested, and further improving the DCR test accuracy of the battery to be tested.
[0138] In one embodiment, Figure 6 As shown, when the test temperature reaches the second temperature threshold, the step of performing energy detection on the battery to be tested based on the fourth preset rate to obtain the second capacity data includes:
[0139] Step S610: When the test temperature reaches a second temperature threshold, the battery to be tested is left alone for a second preset time.
[0140] The second preset time may be obtained according to a system preset, for example, the second preset time may be set to 6 hours.
[0141] By placing the battery to be tested on hold for a second preset time before the RPT test step corresponding to the second temperature threshold of the battery to be tested, the temperature of the battery to be tested can be kept constant to the test temperature, so that the voltage of the battery to be tested is stabilized at this temperature, and then the battery temperature and voltage of the battery to be tested reach a balanced state, so that when the DCR test is performed on the battery to be tested, the accuracy of the DCR test at the second temperature threshold (such as high temperature) can be improved.
[0142] Step S620: Based on a fourth preset discharge rate and a fourth preset charge rate, energy detection is performed on the battery to be tested to obtain second capacity data.
[0143] The fourth preset discharge rate may be set equal to the fourth preset charge rate.
[0144] For example, the fourth preset discharge rate is 0.5C, and the fourth preset charge rate is 0.5C. When the test temperature is the second temperature threshold (such as 40°C), the battery to be tested is left to stand for a second preset time (such as 6 hours). After standing for the second preset time, the battery to be tested is charged at a rate of 0.5C, discharged at a rate of 0.5C, and charged at a rate of 0.5C in sequence, and energy detection is performed on the battery to be tested to obtain second capacity data.
[0145] In one embodiment, the step of performing a DCR test on the battery to be tested based on the fifth preset rate and the second preset SOC to obtain the second DCR data includes:
[0146] The battery to be tested is left for a third preset time.
[0147] The third preset time may be obtained according to a system preset, for example, the third preset time may be set to 1 hour.
[0148] By placing the battery to be tested on hold for a third preset time before the DCR test in the second RPT test step of the battery to be tested, the temperature of the battery to be tested can be kept constant to reach the test temperature after completing the energy detection in the second RPT test step, so that the voltage of the battery to be tested is stable at this temperature, and then the battery temperature and voltage of the battery to be tested reach a balanced state, thereby improving the accuracy of the DCR test when the DCR test is performed on the battery to be tested.
[0149] In one example, the step of performing a DCR test on the battery to be tested based on the fifth preset rate and the second preset SOC to obtain second DCR data includes:
[0150] Based on the second preset SOC range, the second SOC step value and the second preset interval time, the DCR test is performed at least twice on the battery to be tested under the fifth preset rate condition to obtain second DCR data.
[0151] The fifth preset rate may include a fifth preset charge rate and a fifth preset discharge rate, and the fifth preset charge rate and the fifth preset discharge rate may be set to 0.5 C. The second preset SOC range, the second SOC step value and the second preset interval time may be obtained according to system presets.
[0152] For example, the second preset SOC range can be set to 10% SOC to 90% SOC, the second SOC step value can be set to 20% SOC, and the second preset interval time can be set to 5 minutes, that is, at a charge and discharge rate of 0.5C, each pulse discharge (or pulse charge) interval is left for 5 minutes, and within the range of 10% SOC to 90% SOC, a DCR test is performed every 20% SOC, and accurate second DCR data is obtained by testing, thereby improving the DCR test accuracy of the battery to be tested, while reducing the impact on the performance of the battery to be tested.
[0153] In one embodiment, Figure 7 As shown, when the test temperature reaches the third temperature threshold, the DCR test is performed on the battery to be tested based on the sixth preset rate and the third preset SOC, and the step of obtaining the third DCR data includes:
[0154] Step S710: when the test temperature reaches a third temperature threshold, the battery to be tested is left alone for a fourth preset time.
[0155] The fourth preset time may be obtained according to system presets, for example, the fourth preset time may be set to 6 hours.
[0156] By placing the battery to be tested on hold for a fourth preset time before the RPT test step corresponding to the third temperature threshold of the battery to be tested, the temperature of the battery to be tested can be kept constant to the test temperature, so that the voltage of the battery to be tested is stabilized at this temperature, and then the battery temperature and voltage of the battery to be tested reach a balanced state, so that when the DCR test is performed on the battery to be tested, the accuracy of the DCR test at the third temperature threshold (such as low temperature) can be improved.
[0157] Step S720: Based on the third preset SOC, a DCR test is performed on the battery to be tested under the conditions of a sixth preset discharge rate and a sixth preset charge rate to obtain third DCR data.
[0158] The sixth preset rate may include a sixth preset charge rate and a sixth preset discharge rate, and the sixth preset charge rate and the sixth preset discharge rate may be obtained according to the system preset. The third preset SOC may be 10% SOC, 30% SOC, 50% SOC or 90% SOC, etc. The third DCR data refers to the DCR data under the corresponding SOC obtained by performing a DCR test on the battery to be tested based on the sixth preset discharge rate, the sixth preset charge rate and the third preset SOC.
[0159] In one example, the step of performing a DCR test on the battery to be tested under the conditions of a sixth preset discharge rate and a sixth preset charge rate based on the third preset SOC to obtain third DCR data includes:
[0160] Based on the third preset SOC range, the third SOC step value and the third preset interval time, the DCR test is performed at least twice on the battery to be tested under the conditions of a sixth preset discharge rate and a sixth preset charge rate to obtain third DCR data.
[0161] The sixth preset rate may include a sixth preset charge rate and a sixth preset discharge rate, the sixth preset charge rate may be set to 0.05 C, and the sixth preset discharge rate may be set to 0.5 C. The third preset SOC range, the third SOC step value, and the third preset interval time may be obtained according to system presets.
[0162] For example, the third preset SOC range can be set to 10% SOC to 90% SOC, the third SOC step value can be set to 20% SOC, and the third preset interval time can be set to 5 minutes, that is, at a discharge rate of 0.5C and a charge rate of 0.05C, each pulse discharge (or pulse charge) interval is left for 5 minutes, and within the range of 10% SOC to 90% SOC, a DCR test is performed every 20% SOC, and accurate third DCR data is obtained by testing, thereby improving the DCR test accuracy of the battery to be tested, while reducing the impact on the performance of the battery to be tested.
[0163] In one example, the battery to be tested is left for 4 hours before the DCR test corresponding to the third temperature threshold of the battery to be tested, thereby ensuring that the temperature of the battery to be tested reaches the test temperature at the beginning of the DCR test, thereby further improving the accuracy of the DCR test.
[0164] In one embodiment, the step of obtaining target DCR data according to the first test data and the second test data includes:
[0165] According to the first test data and the second test data, target capacity data is obtained; according to the target DCR data and the target capacity data, a DCR and capacity curve is established.
[0166] By integrating the first test data and the second test data of the battery to be tested, the target capacity data of the battery to be tested under the corresponding temperature and storage time adjustment can be obtained; a coordinate system can be established in advance, for example, with the storage time as the horizontal coordinate and the target DCR and target capacity at different temperatures as the vertical coordinate, and then a DCR and capacity curve can be established, so that users can view the DCR and capacity changes of the battery to be tested during the storage process.
[0167] In one embodiment, at least two batteries to be tested may be selected to perform Multi-RPT testing simultaneously. During the storage of the batteries to be tested, Multi-RPT testing may be performed once a month. After one year of storage, the testing may be changed to once every six months. It should be noted that the test interval of the Multi-RPT test may be from once a month to once every six months for different tests. The duration of a Multi-RPT test is usually 6 days, which can reduce the test frequency and test cycle, thereby improving the test efficiency.
[0168] Exemplarily, a single Multi-RPT test process is as follows: Figure 8 As shown, at a test temperature of 25°C, energy detection is performed based on a 0.5C rate discharge and a 0.25C rate charge; based on a DCR test at a 0.5C charge and discharge rate, such as a 1-hour rest before a pulse, a 5-minute rest between each pulse, and a DCR test every 10% SOC (and within the range of 10% SOC to 90% SOC); based on energy detection at a 0.05C charge and discharge rate, the first initial capacity data, the first DCR data, and the first end capacity data are obtained.
[0169] like Fig. 9 As shown, at a test temperature of 40°C, the battery to be tested is first allowed to stand for 6 hours; energy detection is performed based on a 0.5C charge and discharge rate; based on a DCR test at a 0.5C charge and discharge rate, such as standing for 1 hour before a pulse, standing for 5 minutes between each pulse, and performing a DCR test every 20% SOC (and within the range of 10% SOC to 90% SOC), thereby obtaining a second capacity data and a second DCR data.
[0170] like Fig.10 As shown, at a test temperature of 0°C, the battery to be tested is first allowed to stand for 6 hours; a DCR test is performed based on a 0.5C discharge rate and a 0.05C charge rate, such as standing for 4 hours before a pulse, standing for 5 minutes between each pulse, and performing a DCR test every 20% SOC (and within the range of 10% SOC to 90% SOC), thereby obtaining the third DCR data.
[0171] By regularly performing Multi-RPT tests on the battery under test during storage, by calibrating the changes in DCR with storage cycles at different temperatures and eliminating the interference of previous working conditions, it is possible to test the DCR under different conditions under this cycle storage condition (corresponding temperature and storage time). For example, if it is necessary to test the DCR changes at 0°C each month under high-temperature storage at 40°C, each test needs to accurately test the interference of time variables (the first month and the second month, etc.) and test temperature (such as testing the DCR at 0°C under 40°C working conditions), so as to obtain accurate DCR and reduce the performance impact of the battery under test.
[0172] It should be noted that the battery storage test method of the present application can also be applied to perform energy or DCR tests on batteries undergoing long-term cycle decay tests. The specific test process is as described in the above embodiment and will not be repeated here.
[0173] It should be understood that although Figures 2 to 7 The steps in the flowchart are shown in sequence as indicated by the arrows, but these steps are not necessarily executed in the order indicated by the arrows. Unless otherwise specified in this document, there is no strict order restriction for the execution of these steps, and these steps can be executed in other orders. Moreover, Figures 2 to 7 At least part of the steps may include multiple sub-steps or multiple stages. These sub-steps or stages are not necessarily executed at the same time, but can be executed at different times. The execution order of these sub-steps or stages is not necessarily sequential, but can be executed in turn or alternately with other steps or at least part of the sub-steps or stages of other steps.
[0174] In one embodiment, Fig.11 As shown, a battery storage test system is also provided, including a processing device, the processing device is connected to the battery to be tested; the processing device is used to execute the steps of any one of the above-mentioned battery storage test methods.
[0175] For example, the processing equipment may include a processor, a test fixture and a test device, and the processing equipment may also include at least one test incubator. The test fixture is arranged in the test incubator, the test fixture is used to fix the battery to be tested, the test device connects the processor and the battery to be tested, the test device is used to control the charge and discharge of the battery to be tested, and the test device is also used to collect temperature data and electrical signal data of the battery to be tested.
[0176] The processing equipment obtains the current ambient temperature of the battery to be tested when the storage time reaches the preset time value; selects the RPT test conditions according to the current ambient temperature, and performs the RPT test on the battery to be tested based on the RPT test conditions to obtain the target DCR data, thereby realizing accurate DCR testing of the energy storage battery during the long-term storage test of the energy storage battery.
[0177] In the above embodiment, during the storage process of the battery to be tested, the battery to be tested is tested regularly based on a preset time value, and according to the current ambient temperature, the corresponding RPT test conditions are selected, and then the RPT test is performed on the battery to be tested based on the corresponding RPT test conditions, so as to obtain accurate target DCR data, and at the same time reduce the impact on battery performance, improve the DCR test accuracy of the energy storage battery, and reduce the impact on battery capacity attenuation.
[0178] 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 specification.
[0179] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent 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 patent application shall be subject to the attached claims.
Claims
1. A battery storage test method, characterized in that: The following steps are involved: When the storage time reaches a preset time value, the current ambient temperature of the corresponding battery to be tested is obtained; An RPT test condition is selected according to the current ambient temperature, and an RPT test is performed on the battery to be tested based on the RPT test condition to obtain target DCR data.
2. The battery storage test method according to claim 1, characterized in that: The step of selecting RPT test conditions according to the current ambient temperature, and performing RPT test on the battery to be tested based on the RPT test conditions to obtain target DCR data includes: When the current ambient temperature reaches a first temperature range value, selecting a first RPT test condition, and performing a first RPT test on the battery to be tested based on the first RPT test condition to obtain first test data; Perform a second RPT test on the battery to be tested based on a second RPT test condition to obtain second test data; Target DCR data is obtained according to the first test data and the second test data.
3. The battery storage test method according to claim 2, characterized in that: The step of performing a first RPT test on the battery to be tested based on the first RPT test condition to obtain first test data comprises: When the test temperature reaches a first temperature threshold, energy detection is performed on the battery to be tested based on a first preset multiple to obtain first initial capacity data; Performing a DCR test on the battery to be tested based on a second preset rate and a first preset SOC to obtain first DCR data; Performing energy detection on the battery to be tested based on a third preset rate to obtain first end capacity data; the third preset rate is less than the first preset rate; The first test data is obtained according to the first initial capacity data, the first DCR data and the first end capacity data.
4. The battery storage test method according to claim 3, characterized in that: The step of performing a DCR test on the battery to be tested based on the second preset rate and the first preset SOC to obtain the first DCR data includes: Leaving the battery to be tested for a first preset time; The step of performing a DCR test on the battery to be tested based on the second preset rate and the first preset SOC to obtain first DCR data includes: Based on a first preset SOC range, a first SOC step value and a first preset interval time, the DCR test is performed at least twice on the battery to be tested under the second preset rate condition to obtain the first DCR data.
5. The battery storage test method according to claim 3, characterized in that: The step of performing energy detection on the battery to be tested based on the first preset rate to obtain first initial capacity data comprises: Based on a first preset discharge rate and a first preset charge rate, energy detection is performed on the battery to be tested to obtain the first initial capacity data; the value of the first preset discharge rate is greater than the value of the first preset charge rate; The step of performing energy detection on the battery to be tested based on the third preset rate to obtain first end capacity data comprises: Energy detection is performed on the battery to be tested based on a third preset discharge rate and a third preset charge rate to obtain the first end capacity data; the value of the third preset discharge rate is equal to the third preset charge rate.
6. The battery storage test method according to claim 2, characterized in that: The step of performing a second RPT test on the battery to be tested based on the second RPT test condition to obtain second test data comprises: When the test temperature reaches a second temperature threshold, energy detection is performed on the battery to be tested based on a fourth preset rate to obtain second capacity data; Performing a DCR test on the battery to be tested based on a fifth preset rate and a second preset SOC to obtain second DCR data; The second test data is obtained according to the second capacity data and the second DCR data.
7. The battery storage test method according to claim 6, characterized in that: The step of performing a DCR test on the battery to be tested based on the fifth preset multiple and the second preset SOC to obtain second DCR data includes: When the test temperature reaches a third temperature threshold, performing a DCR test on the battery to be tested based on a sixth preset rate and a third preset SOC to obtain third DCR data; The step of obtaining the second test data according to the second capacity data and the second DCR data comprises: The second test data is obtained according to the second capacity data, the second DCR data and the third DCR data.
8. The battery storage test method according to claim 6, characterized in that: When the test temperature reaches the second temperature threshold, the step of performing energy detection on the battery to be tested based on the fourth preset rate to obtain the second capacity data includes: When the test temperature reaches a second temperature threshold, placing the battery under test on hold for a second preset time; Based on the fourth preset discharge rate and the fourth preset charge rate, energy detection is performed on the battery to be tested to obtain the second capacity data.
9. The battery storage test method according to claim 6, characterized in that: The step of performing a DCR test on the battery to be tested based on the fifth preset multiple and the second preset SOC to obtain second DCR data includes: placing the battery under test on hold for a third preset time; The step of performing a DCR test on the battery to be tested based on the fifth preset rate and the second preset SOC to obtain second DCR data includes: Based on the second preset SOC range, the second SOC step value and the second preset interval time, the DCR test is performed on the battery to be tested at least twice under the fifth preset rate condition to obtain the second DCR data.
10. The battery storage test method according to claim 7, characterized in that: The step of performing a DCR test on the battery to be tested based on a sixth preset rate and a third preset SOC to obtain third DCR data when the test temperature reaches a third temperature threshold comprises: When the test temperature reaches a third temperature threshold, placing the battery under test on hold for a fourth preset time; Based on the third preset SOC, a DCR test is performed on the battery to be tested under the conditions of a sixth preset discharge rate and a sixth preset charge rate to obtain the third DCR data.
11. The battery storage test method according to claim 10, characterized in that: The step of performing a DCR test on the battery to be tested under the conditions of a sixth preset discharge rate and a sixth preset charge rate based on the third preset SOC to obtain the third DCR data comprises: Based on the third preset SOC range, the third SOC step value and the third preset interval time, the DCR test is performed at least twice on the battery to be tested under the conditions of the sixth preset discharge rate and the sixth preset charge rate to obtain the third DCR data.
12. The battery storage test method according to any one of claims 1 to 11, characterized in that: The step of obtaining target DCR data according to the first test data and the second test data comprises: Obtaining target capacity data according to the first test data and the second test data; A DCR and capacity curve is established according to the target DCR data and the target capacity data.
13. A battery storage test system, characterized in that: It includes a processing device, wherein the processing device is connected to a battery to be tested; The processing device is used to execute the steps of the battery storage testing method according to any one of claims 1 to 12.