Rapid warning method, device, electronic device and computer-readable storage medium for sodium battery cell cycle gas production

Abstract

The present invention provides a rapid warning method, device, electronic device and computer-readable storage medium for cyclic gas production of sodium battery cells. The rapid warning method comprises the following steps: performing a first cycle test on the battery cell to be tested, obtaining a corresponding capacity increment curve, and obtaining the peak value of the discharge reduction peak in the capacity increment curve; performing x cycles of the battery cell to be tested, and obtaining the corresponding capacity increment curve when performing the xth cycle test, and obtaining the peak value of the discharge reduction peak in the capacity increment curve; calculating the warning value Z according to the warning formula 计算 :#imgabs0#; When Z 计算 ≥Z 预设 When the test is completed, an alarm signal is issued. The rapid early warning method is simple and convenient, the test results are accurate, the cost is low and the feasibility is high. In addition, the rapid early warning method solves the problems of the existing cycle volume test, such as long cycle time, cumbersome operation and untimely result response, and has good application prospects.

Description

Technical Field

[0001] The present invention belongs to the field of battery detection technology, and specifically relates to a rapid early warning method, device, electronic equipment and computer-readable storage medium for cyclic gas production of sodium battery cells. Background Art

[0002] Sodium-ion batteries have the advantages of low cost and high safety, and will be widely used in 3C smart terminals, energy storage, electric vehicles and other fields in the future. However, during the charging and discharging process of sodium-ion batteries, a series of chemical reactions occur between the positive and negative electrode materials and the electrolyte, which will produce gas, causing battery swelling and other phenomena. Swelling batteries are dangerous, which to a certain extent restricts the future market application of sodium-ion batteries. Therefore, it is necessary to detect the gas production of sodium-ion batteries during the cycle process.

[0003] At present, the positive electrode of sodium ion batteries is generally an O3-type layered oxide sodium positive electrode, and the gas production is relatively serious. For the test scheme of high-temperature cyclic gas production, the commonly used method is to perform cyclic charge and discharge tests on the battery in a high-temperature constant temperature box. After the test is completed, the battery gas production is detected in a static manner. It is impossible to monitor the volume of the battery cell during the cycle in real time. When the volume of the battery cell reaches an abnormal value, it is still necessary to stop the battery and then conduct a volume test. This test method not only has a long cycle and complex procedures, but also cannot pay attention to it in time after the gas production reaches the limit value, and conduct subsequent analysis and follow-up. It has a long lag, which causes inconvenience for the quantitative analysis and monitoring of battery cell gas production.

[0004] In the prior art, patent CN217132291U provides an online monitoring system for gas production during high-temperature cycles of batteries, in which a battery cell to be tested is fixedly connected by a battery fixing device and placed in an oil bath solvent in a battery container for oil bathing, a heating device is used to heat the oil bath solvent in the battery container at a controllable temperature, and a weighing device at the lower end is used to collect weight data of the battery cell to be tested in the oil bath in a charging and discharging device, thereby enabling online monitoring of gas production in each cycle process. Patent CN207352133U provides an alarm protection device for detecting gas expansion during the cycle of lithium-ion batteries, including a semi-frame support frame formed by connecting a support plate, a bottom plate and a top plate, a fixed splint is vertically fixed on the bottom plate, and a movable baffle and a pressure sensor are arranged in sequence on the bottom plate between the fixed splint and the support plate, and an infrared reflector is laid on the bottom plate surrounded by the movable baffle, the pressure sensor and the support plate; the two ends of the pressure sensor are in contact with the movable baffle and the support plate respectively; an infrared photoelectric sensor is fixed at the bottom end of the top plate, and the bottom extension line of the infrared photoelectric sensor intersects with the infrared reflector, and the infrared photoelectric sensor is electrically connected to the induction alarm light fixed on the top plate. However, the above-mentioned test method has a complex device, low volume test accuracy, and low applicability. It can only be used to test some models of small batteries, and the cost of use is high.

[0005] Therefore, there is an urgent need to provide a detection method that is simple and convenient, has accurate detection results, is low in cost and highly feasible. Summary of the invention

[0006] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a rapid warning method, device, electronic device and computer-readable storage medium for the cyclic gas production of sodium battery cells. The rapid warning method provided by the present invention does not require volume testing at all times. When the gas production reaches the target value, an alarm signal will be issued. The method is simple and convenient, the test results are accurate, the cost is low and the feasibility is high. In addition, the rapid warning method solves the problems of the existing cyclic volume test, such as long cycle time, cumbersome operation and untimely result response, and has good application prospects.

[0007] In order to achieve the purpose of the invention, the present invention adopts the following technical solutions:

[0008] In a first aspect, the present invention provides a rapid early warning method for sodium battery cell cycle gas production, the rapid early warning method comprising the following steps:

[0009] (1) Perform the first cycle test on the battery cell to be tested, obtain the corresponding capacity increment curve, and obtain the peak value of the discharge reduction peak in the capacity increment curve; wherein the high voltage reduction peak value is recorded as C N0 , the low voltage reduction peak is recorded as C L0 .

[0010] (2) Performing x cycles of test on the battery cell to be tested, obtaining a corresponding capacity increment curve during the xth cycle test, and obtaining the peak value of the discharge reduction peak in the capacity increment curve; wherein, x is greater than 1, and the high voltage reduction peak value is recorded as C NX , the low voltage reduction peak is recorded as C LX .

[0011] (3) According to the following warning formula, the warning value Z is calculated 计算 :

[0012] Among them, C N0 , C L0 , C NX and C LX The unit is Ah / V, Z 预设 It is the pre-set target warning value;

[0013] When Z 计算 ≥Z 预设 When an alarm signal is issued.

[0014] It should be noted that the capacity increment curve (IC curve) is a battery capacity change curve under unit voltage, which can effectively and accurately reflect the side reactions in the battery process. The electrolyte side reaction of the battery is usually accompanied by the generation of gas. Therefore, the peak position change of the electrolyte side reaction can be identified to correspond to the gas change in the battery, thereby monitoring the volume fluctuation of the battery in real time. N0 , C L0 , C NX and C LX Both represent the capacity change of the battery cell under test at unit voltage.

[0015] The present invention performs a cyclic treatment on the battery cell to be tested, so that the battery cell can obtain a voltage-capacity curve according to the cyclic test while maintaining a set real-time monitoring system, and then derive an IC curve, thereby calculating a warning value, and then indirectly obtain the degree of lattice oxygen release of the battery cell according to the voltage change of different phase changes, thereby inferring the gas production result of the battery cell. In addition, in the non-initial cycle process where the warning value is set, the present invention does not need to perform additional volume testing, and can ensure that the gas production process of the battery cell to be tested does not change by only calculating and comparing different warning values, thereby ensuring that the rapid determination method of sodium battery cyclic gas production can be executed.

[0016] In summary, the rapid warning method provided by the present invention is simple and convenient, has accurate detection results, low cost and high feasibility. In addition, the rapid warning method solves the problems of the existing cycle volume test, such as long cycle time, cumbersome operation and untimely result response, improves the efficiency and accuracy of the battery cell gas production test, and has good application prospects.

[0017] The rapid warning method provided by the present invention can be widely used in soft-pack, cylindrical or aluminum square shell battery cell systems.

[0018] In the present invention, x is greater than 1, for example, it can be 2, 5, 10, 15, 20, 25 or 30.

[0019] Preferably, the positive electrode of the battery cell to be tested includes an O3-type layered oxide positive electrode material or a single crystal positive electrode material.

[0020] Preferably, the single crystal positive electrode material is a quaternary single crystal positive electrode material, for example, a nickel-zinc-iron-manganese single crystal positive electrode material.

[0021] Preferably, when obtaining the peak value of the discharge reduction peak in the capacity increment curve in step (1), the initial volume of the battery cell to be tested is also obtained.

[0022] When obtaining the peak value of the discharge reduction peak in the capacity increment curve in step (2), the final volume of the battery cell to be tested and the volume growth rate of the battery cell to be tested are also obtained.

[0023] In the present invention, the volume growth rate is calculated as follows: volume growth rate = (second volume - first volume) / first volume × 100%. In addition, for the initial volume growth rate, it is the volume growth rate of the battery cell after the first cycle, and the calculation method is: initial volume growth rate = (initial volume - battery cell volume before cycling) / battery cell volume before cycling × 100%, and for the final volume growth rate, it is the final battery cell volume growth rate when the warning value is reached, and the calculation method is: final volume growth rate = (final battery cell volume - battery cell volume before cycling) / battery cell volume before cycling × 100%.

[0024] In the present invention, volume testing can be used as a more accurate verification data. If the cell to be tested does not have warning value data during the first test, the warning value of the battery can be calibrated through the volume test data. When the cell reaches the target volume (i.e. the cell volume that causes safety risks, which is manually set according to the test requirements), the warning value at this time can be used as the warning value for subsequent tests.

[0025] Preferably, the method for obtaining the initial volume and the final volume comprises a drainage test method.

[0026] Preferably, the high voltage range of the capacity increment curve in step (1) and step (2) is 3.4-3.6V, for example, 3.4V, 3.5V or 3.6V, and the low voltage range is 2.6-2.8V, for example, 2.6V, 2.7V or 2.8V.

[0027] In the present invention, for O3-type layered oxide positive electrode materials, when the high voltage interval of the capacity increment curve is 3.4-3.6V, this area mainly corresponds to the process of the P3 phase returning to the O3 phase after sodium insertion, representing the oxygen-depleted state of the positive electrode material. When the low voltage interval of the capacity increment curve is 2.6-2.8V, this area mainly corresponds to the reduction process of the O3 phase after sodium insertion, representing the degree of side reactions of the positive electrode material. Corresponding to the high voltage reduction peak, the degree of side reactions of the positive electrode material with the electrolyte after circulation can be judged. This side reaction is usually accompanied by a gas production process, thereby characterizing the degree of gas production.

[0028] Preferably, the method for the first cycle test in step (1) comprises: charging the battery cell to be tested to a termination voltage, and then discharging the battery cell to be tested that has been charged to the termination voltage.

[0029] Preferably, the charging process is a constant current and constant voltage process.

[0030] Preferably, the discharge treatment process is a constant current discharge process.

[0031] It should be noted that the cycle rate of the battery cell to be tested during the charge and discharge process is the current size that can accelerate the cyclic gas production of the sodium battery without changing the gas production mechanism.

[0032] It should be noted that the test conditions for the remaining x-1 cycle tests after the first cycle test are the same as the test conditions for the first cycle test.

[0033] In a second aspect, the present invention provides an early warning system device used in the rapid early warning method according to the first aspect, wherein the early warning system device comprises:

[0034] The test cell acquisition module is used to repeatedly perform x cycles of testing on the test cell.

[0035] The initial characteristic value acquisition module is used to obtain the C value of the battery cell to be tested in the first cycle test. N0 and C L0 .

[0036] The final characteristic value acquisition module is used to obtain the C value of the battery cell to be tested in the xth cycle test. NX and C LX .

[0037] The warning value calculation module is used to calculate the Z value of the battery cell to be tested according to the initial characteristic value and the final characteristic value of the battery cell to be tested. 计算 .

[0038] It should be noted that the initial eigenvalue is C L0 and C N0 The final eigenvalue is CLX and C NX ratio.

[0039] Preferably, the battery cell acquisition module to be tested includes:

[0040] The test cell acquisition unit is used to perform a cycle test on the test cell according to a preset cycle ratio to obtain the test cell.

[0041] Preferably, the battery cell acquisition unit to be tested includes:

[0042] The final gas production measurement data group acquisition subunit is used to perform rapid measurement of sodium electrocyclic gas production multiple times, and select the obtained Z 计算 The data of the gas production volume being greater than the target volume is used as the final set warning value data group.

[0043] It should be noted that the gas production volume is the volume of the battery cell at the last cycle test, and the target volume is the volume of the battery cell when the battery cell reaches a safety risk. For example, the system alarms when the usage requirement reaches 10mL. Therefore, it is necessary to determine the IC curve data when the battery cell volume is greater than 10mL when the warning value is first determined. The IC curve data of this cycle is calculated by the above formula to obtain Z, and Z is set as the warning value data. Then, the warning system can be tested for subsequent batteries; the target volume here is 10mL, the gas production volume is greater than 10mL, and the warning value is finally set to Z.

[0044] Preferably, the initial eigenvalue acquisition module includes:

[0045] The initial volume acquisition unit is used to obtain the initial volume of the battery cell to be tested after the first cycle test.

[0046] It should be noted that the initial volume of the battery cell to be tested after the first cycle test can be obtained by the water displacement method, which improves the accuracy of obtaining the volume of the battery cell to be tested.

[0047] Preferably, the final feature value acquisition module includes:

[0048] The final volume acquisition unit is used to obtain the final volume of the battery cell to be tested after the xth cycle test.

[0049] It should be noted that the initial volume of the battery cell to be tested after the x-th cycle test can be obtained by the water displacement method, which improves the accuracy of obtaining the volume of the battery cell to be tested.

[0050] Preferably, the early warning system device further includes:

[0051] The final gas production volume data acquisition module is used when Z 计算 Reach Z预设 When the final gas production volume of the battery cell to be tested is obtained.

[0052] In the present invention, the final gas production volume data acquisition module includes a final volume acquisition unit function of the battery cell, which can acquire the volume of the battery cell at this time, thereby obtaining the final gas production volume of the battery cell.

[0053] The electrochemical setup module is used to perform cycle tests on the battery cells to be tested.

[0054] The data calculation module of the capacity increment curve is used to derive the capacity-voltage curve obtained by the cycle test to obtain the capacity increment curve, so as to obtain the characteristic value of the battery cell to be tested.

[0055] The recording module is used to record the characteristic values ​​of the battery cell to be tested.

[0056] The electrochemical setting module provided in the present invention can improve the efficiency of rapid determination of cyclic gas production of sodium batteries.

[0057] It should be noted that the characteristic value of the battery cell to be tested refers to the ratio of the high voltage reduction peak value to the high voltage reduction peak value.

[0058] In a third aspect, the present invention provides an electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the rapid warning method as described in the first aspect when executing the computer program.

[0059] It should be noted that the memory stores an operating system and operating instructions, executable modules or data structures, or a subset thereof, or an extended set thereof, wherein the operating instructions may include various operating instructions for implementing various operations, and the operating system may include various system programs for implementing various basic tasks and processing hardware-based tasks.

[0060] It should be noted that the processor can be a central processing unit (CPU), a specific application integrated circuit, a digital signal processor, a field programmable gate array or other programmable logic device; the processor can be a microprocessor or any conventional processor, etc.; the processor can call a computer program stored in a memory.

[0061] Preferably, the memory is used to store at least one computer program. It should be noted that the computer program may include program code, and the program code includes computer operation instructions.

[0062] Preferably, the electronic device further comprises a communication interface, and the memory, processor and communication interface all communicate with each other via a communication bus.

[0063] It should be noted that the communication interface may be an interface of a communication module, which is used to connect to other devices or systems.

[0064] It should be noted that the structure of the electronic device does not constitute a limitation on the early warning system device provided by the present invention. In practical applications, the early warning system device for sodium battery cyclic gas production may include more or fewer components of the above-mentioned electronic device, or a combination of certain components.

[0065] Preferably, the memory includes a program storage area and a data storage area. The program storage area can store an operating system and at least one application required for a function, and the data storage area can store data created during use.

[0066] Preferably, the memory is selected from a read-only memory or a random access memory.

[0067] Preferably, the random access memory comprises a non-volatile random access memory.

[0068] In a fourth aspect, the present invention provides a computer-readable storage medium having a computer program stored thereon, and when the computer program is executed by a processor, the rapid warning method as described in the first aspect is implemented.

[0069] It should be noted that the computer-readable storage medium can be selected from various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0070] The numerical range described in the present invention not only includes the point values ​​listed above, but also includes any point values ​​between the above numerical ranges that are not listed. Due to space limitations and for the sake of simplicity, the present invention no longer exhaustively lists the specific point values ​​included in the range.

[0071] Compared with the prior art, the present invention has the following beneficial effects:

[0072] (1) The present invention performs a cyclic treatment on the battery cell to be tested, so that the battery cell can obtain a voltage-capacity curve according to the cyclic test under the set real-time monitoring system, and then derive the IC curve, thereby calculating the warning value, and then indirectly obtain the degree of lattice oxygen release of the battery cell according to the voltage change of different phase changes, thereby inferring the gas production result of the battery cell. In addition, in the non-initial cycle process when the warning value is set, the present invention does not need to perform additional volume testing. Only by calculating and comparing different warning values, it can ensure that the gas production process of the battery cell to be tested does not change, and ensure that the rapid determination method of sodium battery cyclic gas production can be implemented.

[0073] (2) The rapid warning method provided by the present invention is simple and convenient, has accurate detection results, low cost and high feasibility. In addition, the rapid warning method solves the problems of the existing cycle volume test, such as long cycle time, cumbersome operation and untimely result response, improves the efficiency and accuracy of the battery cell gas production test, and has good application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0074] Figure 1 A schematic flow chart of a rapid early warning method for cyclic gas production in a sodium battery cell provided by the present invention.

[0075] Figure 2 The IC curves corresponding to the first cycle test and the last cycle test of the battery cell under test provided by the experimental group of the present invention.

[0076] Figure 3 The IC curves corresponding to the first cycle test and the last cycle test of the battery cell to be tested provided by the comparison group of the present invention.

[0077] Figure 4 A bar chart of volume growth rate obtained during the first cycle test and the last cycle test of the battery cells to be tested provided for the experimental group and the comparison group of the present invention.

[0078] Figure 5 This is a structural schematic diagram of the early warning system device provided by the present invention.

[0079] Figure 6 This is a schematic structural diagram of an electronic device provided by the present invention.

[0080] Among them, 100 - a cell acquisition module to be tested; 200 - an initial characteristic value acquisition module; 300 - a final characteristic value acquisition module; 400 - a warning value calculation module; 10 - a memory; 20 - a processor; 30 - a communication interface; and 40 - a communication bus. DETAILED DESCRIPTION

[0081] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0082] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0083] Experimental Group

[0084] This experimental group provides a rapid warning method for sodium battery cell cycle gas production, the flow diagram is as follows Figure 1 As shown, the rapid early warning method comprises the following steps:

[0085] (1) A sodium-ion battery to be tested is provided, wherein the positive electrode of the sodium-ion battery to be tested comprises a nickel-copper-iron-manganese-based quaternary O3-type layered oxide positive electrode material.

[0086] (2) Carry out the first cycle test on the sodium battery soft pack battery to be tested. The specific test steps include:

[0087] a. Let stand for 5 minutes.

[0088] b. Constant current and constant voltage charging, set the constant current charging current to 0.5C, the charging cut-off voltage to 4V, the constant voltage charging voltage to 4V, and the charging cut-off current to 0.05C.

[0089] c. Let stand for 5 minutes.

[0090] d. Constant current discharge, set the discharge cut-off voltage to 2V.

[0091] After the first cycle test, the corresponding capacity increment curve is obtained, and the peak value of the discharge reduction peak in the capacity increment curve is obtained. At the same time, the initial volume of the sodium battery soft pack battery to be tested is obtained by the water displacement method; among them, the high voltage reduction peak is recorded as C N0 , the low voltage reduction peak is recorded as C L0 .

[0092] (3) The sodium-ion battery soft-pack is subjected to 200 cycle tests, wherein each cycle test is repeated according to step a to step d described in step (2). When the sodium-ion battery soft-pack is subjected to the 200th cycle test, a corresponding capacity increment curve is obtained, and the peak value of the discharge reduction peak in the capacity increment curve is obtained. At the same time, the final volume and volume growth rate of the sodium-ion battery soft-pack are obtained by the water displacement method; wherein the high voltage reduction peak value is recorded as C NX, the low voltage reduction peak is recorded as C LX .

[0093] (4) According to the early warning formula, the early warning value Z is calculated 计算 :

[0094] Among them, C N0 , C L0 , C NX and C LX The unit is Ah / V, Z 预设 It is the preset target warning value, and its value is 1.

[0095] pass Figure 2 It can be seen that the initial eigenvalue C is obtained L0 / C N0 is 0.717131, and the final eigenvalue C LX / C NX is 2.042802, so we can calculate Z 计算 is 1.32567, Z 计算 >Z 预设 , sending out an alarm signal.

[0096] In addition, the initial volume and final volume were obtained by the drainage method, and then the initial volume growth rate of the tested sodium electric soft pack battery was calculated to be 1.19%, and the final volume growth rate was 16.34%. Figure 4 As shown, the volume growth rate is 15% higher than the set cell gas production volume warning value, indicating that the cell gas production volume has reached the set warning value. It should be noted that this is an abnormal cell and requires subsequent processing.

[0097] Comparison group

[0098] This comparative group provides a rapid early warning method for sodium battery cell cycle gas production, the rapid early warning method comprising the following steps:

[0099] (1) A sodium-ion battery to be tested is provided, wherein the positive electrode of the sodium-ion battery to be tested comprises a nickel-copper-iron-manganese-based quaternary O3-type layered oxide positive electrode material.

[0100] (2) Carry out the first cycle test on the sodium battery soft pack battery to be tested. The specific test steps include:

[0101] a. Let stand for 5 minutes.

[0102] b. Constant current and constant voltage charging, set the constant current charging current to 0.5C, the charging cut-off voltage to 4V, the constant voltage charging voltage to 4V, and the charging cut-off current to 0.05C.

[0103] c. Let stand for 5 minutes.

[0104] d. Constant current discharge, set the discharge cut-off voltage to 2V.

[0105] After the first cycle test is completed, the corresponding capacity increment curve is obtained, and the peak value of the discharge reduction peak in the capacity increment curve is obtained. At the same time, the initial volume of the sodium battery soft pack battery to be tested is obtained by the water displacement method; wherein the high voltage reduction peak value is recorded as C N0 , the low voltage reduction peak is recorded as C L0 .

[0106] (3) The sodium-ion battery soft-pack is subjected to 200 cycle tests, wherein each cycle test is repeated according to step a to step d described in step (2). When the sodium-ion battery soft-pack is subjected to the 200th cycle test, a corresponding capacity increment curve is obtained, and the peak value of the discharge reduction peak in the capacity increment curve is obtained. At the same time, the final volume and volume growth rate of the sodium-ion battery soft-pack are obtained by the water displacement method; wherein the high voltage reduction peak value is recorded as C NX , the low voltage reduction peak is recorded as C LX .

[0107] (4) According to the early warning formula, the early warning value Z is calculated 计算 :

[0108] Among them, C N0 , C L0 , C NX and C LX The unit is Ah / V, Z 预设 It is the preset target warning value, and its value is 1.

[0109] pass Figure 3 It can be seen that the initial eigenvalue C is obtained L0 / C N0 is 0.79604, and the final eigenvalue C LX / C NX is 1.25066, so we can calculate Z 计算 is 0.45462, Z 计算 <Z 预设 , no alarm signal will be issued.

[0110] In addition, the initial volume and final volume were obtained by the drainage method, and then the initial volume growth rate of the tested sodium electric soft pack battery was calculated to be 1.24%, and the final volume growth rate was 5.63%. Figure 4 As shown, the volume growth rate is 15% lower than the set cell gas production volume warning value, indicating that the volume of the cell is within a safe range during the cycle test.

[0111] The early warning system device provided by the present invention is described below. The early warning system device and the rapid early warning method described above can be referred to each other.

[0112] Figure 5 The schematic diagram of the structure of the early warning system device provided by the present invention shows that the early warning system device includes:

[0113] The test cell acquisition module 100 is used to repeatedly perform x cycles of testing on the test cell.

[0114] The initial characteristic value acquisition module 200 is used to obtain the C value of the battery cell to be tested in the first cycle test. N0 and C L0 .

[0115] The final characteristic value acquisition module 300 is used to obtain the C value of the battery cell to be tested in the xth cycle test. NX and C LX .

[0116] The warning value calculation module 400 is used to calculate the Z of the battery cell to be tested according to the initial characteristic value and the final characteristic value of the battery cell to be tested. 计算 .

[0117] In some embodiments, the test cell acquisition module includes: a test cell acquisition unit, which is used to perform a cycle test on the test cell according to a preset cycle ratio to obtain the test cell.

[0118] In some embodiments, the cell acquisition unit includes: a final gas production measurement data group acquisition subunit, which is used to perform rapid measurement of gas production by sodium battery cycles for multiple times, and select the obtained Z 计算 The data of the gas production volume being greater than the target volume is used as the final set warning value data group.

[0119] In some embodiments, the initial characteristic value acquisition module includes: an initial volume acquisition unit, which is used to obtain the initial volume of the battery cell to be tested when performing the first cycle test.

[0120] In some embodiments, the final characteristic value acquisition module includes: a final volume acquisition unit, which is used to obtain the final volume of the battery cell to be tested when performing the xth cycle test.

[0121] In some embodiments, the early warning system device further comprises:

[0122] The final gas production volume data acquisition module is used when Z 计算 Reach Z 预设 When the final gas production volume of the battery cell to be tested is obtained.

[0123] The electrochemical setup module is used to perform cycle tests on the battery cells to be tested.

[0124] The data calculation module of the capacity increment curve is used to derive the capacity-voltage curve obtained by the cycle test to obtain the capacity increment curve, so as to obtain the characteristic value of the battery cell to be tested.

[0125] The recording module is used to record the characteristic values ​​of the battery cell to be tested.

[0126] The early warning system device provided by the present invention is used to execute the above-mentioned rapid early warning method. Please refer to the above-mentioned experimental group and comparison group for the specific process and detailed content, which will not be repeated here.

[0127] The electronic device provided by the present invention is described below. The electronic device and the rapid warning method described above can be referenced to each other.

[0128] Figure 6 This is a structural schematic diagram of an electronic device provided by the present invention. As can be seen from the figure, the electronic device includes a memory 10, a processor 20, and a computer program stored in the memory 10 and executable on the processor 20. When the processor 20 executes the computer program, the rapid warning method as described above is implemented.

[0129] The electronic device further includes a communication interface 30 , and the memory 10 , the processor 20 and the communication interface 30 communicate with each other via a communication bus 40 .

[0130] The electronic device provided by the present invention is used to execute the above-mentioned rapid warning method. Please refer to the above-mentioned experimental group and comparison group for the specific process and detailed contents, which will not be repeated here.

[0131] First of all, it should be noted that professionals can realize that the various example units and algorithm steps described in this article can be implemented in electronic hardware, computer software or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in the above description according to the function. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professionals and technicians can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention.

[0132] Finally, it should be noted that in this article, relationships such as initial and final are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprises" or any other variations are intended to cover non-exclusive inclusion, so that a process, method, article or device that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0133] The applicant declares that the above is a detailed introduction to the rapid warning method, device and equipment for the cyclic gas production of sodium battery cells provided by the present invention. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above implementation methods is only used to help understand the method of the present invention and its core idea; at the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scopes. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. A rapid warning method for sodium battery cell cycle gas production, characterized in that: The rapid early warning method comprises the following steps: (1) Perform the first cycle test on the battery cell to be tested, obtain the corresponding capacity increment curve, and obtain the peak value of the discharge reduction peak in the capacity increment curve; wherein the high voltage reduction peak value is recorded as C N0 , the low voltage reduction peak is recorded as C L0 ; (2) Performing x cycles of test on the battery cell to be tested, obtaining a corresponding capacity increment curve during the xth cycle test, and obtaining the peak value of the discharge reduction peak in the capacity increment curve; wherein, x is greater than 1, and the high voltage reduction peak value is recorded as C NX , the low voltage reduction peak is recorded as C LX ; (3) According to the following warning formula, the warning value Z is calculated 计算 : Among them, C N0 , C L0 , C NX and C LX The unit is Ah / V, Z 预设 It is the pre-set target warning value; When Z 计算 ≥Z 预设 When the alarm signal is sent out; The positive electrode material in the positive electrode of the battery cell to be tested is an O3 type layered oxide positive electrode material.

2. The rapid warning method according to claim 1, characterized in that: When obtaining the peak value of the discharge reduction peak in the capacity increment curve in step (1), the initial volume of the battery cell to be tested is also obtained; When obtaining the peak value of the discharge reduction peak in the capacity increment curve in step (2), the final volume of the battery cell to be tested and the volume growth rate of the battery cell to be tested are also obtained; And / or, the method for obtaining the initial volume and the final volume comprises a drainage test method.

3. The rapid warning method according to claim 1, characterized in that: The high voltage range of the capacity increment curve in step (1) and step (2) is 3.4-3.6V, and the low voltage range is 2.6-2.8V; And / or, the method for the first cycle test in step (1) includes: charging the battery cell to be tested to a termination voltage, and then discharging the battery cell to be tested that is charged to the termination voltage.

4. An early warning system device used in the rapid early warning method according to any one of claims 1 to 3, characterized in that: The early warning system device comprises: The test cell acquisition module is used to repeat the test cell cycle test x times; The initial characteristic value acquisition module is used to obtain the C value of the battery cell to be tested in the first cycle test. N0 and C L0 ; The final characteristic value acquisition module is used to obtain the C value of the battery cell to be tested in the xth cycle test. NX and C LX ; The warning value calculation module is used to calculate the Z value of the battery cell to be tested according to the initial characteristic value and the final characteristic value of the battery cell to be tested. 计算 .

5. The early warning system device according to claim 4, characterized in that: The battery cell acquisition module to be tested comprises: A cell-to-be-tested acquisition unit is used to perform a cycle test on the cell-to-be-tested according to a preset cycle ratio to obtain the cell-to-be-tested; And / or, the battery cell acquisition unit to be tested includes: The final gas production measurement data group acquisition subunit is used to perform rapid measurement of sodium electrocyclic gas production multiple times, and select the obtained Z 计算 The data of the gas production volume being greater than the target volume is used as the final set warning value data group.

6. The early warning system device according to claim 4, characterized in that: The initial eigenvalue acquisition module comprises: An initial volume acquisition unit, used to acquire the initial volume of the battery cell to be tested after the first cycle test; And / or, the final feature value acquisition module includes: The final volume acquisition unit is used to obtain the final volume of the battery cell to be tested after the xth cycle test.

7. The early warning system device according to claim 4, characterized in that: The early warning system device also includes: The final gas production volume data acquisition module is used when Z 计算 Reach Z 预设 When , the final gas production volume of the battery cell to be tested is obtained; Electrochemical setting module, used for cycle testing of the battery cell to be tested; The data calculation module of the capacity increment curve is used to derive the capacity-voltage curve obtained by the cycle test to obtain the capacity increment curve, so as to obtain the characteristic value of the battery cell to be tested; The recording module is used to record the characteristic values ​​of the battery cell to be tested.

8. An electronic device, characterized in that: The electronic device includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the rapid warning method according to any one of claims 1 to 3 is implemented.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the rapid warning method according to any one of claims 1 to 3 is implemented.

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