A deep-sea pressure-resistant lithium battery monomer safety comprehensive evaluation method and device

Abstract

The application provides a deep-sea pressure-resistant lithium battery monomer safety comprehensive evaluation method and device, and belongs to the technical field of battery detection. The method comprises the following steps: performing pressure loading and unloading test on a deep-sea pressure-resistant lithium battery monomer to be detected placed in a pressure environment; obtaining voltage data, temperature data and deformation data of the deep-sea pressure-resistant lithium battery monomer to be detected in the pressure loading and unloading test process; and determining the danger level of the deep-sea pressure-resistant lithium battery monomer to be detected based on the voltage data, the temperature data and the deformation data. The voltage data, the temperature data and the deformation data of the deep-sea pressure-resistant lithium battery monomer are detected, the safety of the deep-sea pressure-resistant lithium battery monomer is comprehensively evaluated, and the danger level is given, so that the professional personnel can timely handle the failure of the deep-sea pressure-resistant lithium battery monomer, the use risk of the deep-sea pressure-resistant lithium battery monomer under the deep-sea pressure environment is greatly reduced, and the use safety of the deep-sea pressure-resistant lithium battery monomer is further improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery detection, in particular to a deep-sea pressure-resistant lithium battery monomer safety comprehensive evaluation method and device. BACKGROUND

[0002] The deep-sea pressure-resistant lithium battery monomer needs to work for several days or even months under extreme pressure (up to 115 MPa). The ultra-high pressure may cause internal short circuit of the deep-sea pressure-resistant lithium battery monomer, resulting in rapid voltage drop, rapid heating of the deep-sea pressure-resistant lithium battery monomer, and then serious bulging phenomenon, which endangers the system safety. Therefore, it is necessary to evaluate the safety of the deep-sea pressure-resistant lithium battery monomer before it is put into use, so as to ensure the safety in actual application.

[0003] At present, the safety evaluation of the deep-sea pressure-resistant lithium battery monomer usually adopts the following two methods: one is to predict the performance of the battery through the change of the open-circuit voltage of the deep-sea pressure-resistant lithium battery monomer; the other is to detect the bulging of the deep-sea pressure-resistant lithium battery monomer through the strain sheet. Both methods only use one kind of signal to judge the state of the battery monomer, which has a certain false alarm rate and is not accurate in judging the state of the battery monomer. Moreover, there is no uniform standard to represent the safety level of the battery, that is, the comprehensive evaluation of the state of the battery monomer cannot be realized.

[0004] Therefore, it is necessary to provide a deep-sea pressure-resistant lithium battery monomer safety comprehensive evaluation method and device for accurately evaluating the safety level of the deep-sea pressure-resistant lithium battery monomer running in the deep-sea environment. SUMMARY

[0005] Therefore, it is necessary to provide a deep-sea pressure-resistant lithium battery monomer safety comprehensive evaluation method and device for accurately evaluating the safety level of the deep-sea pressure-resistant lithium battery monomer running in the deep-sea environment.

[0006] On the one hand, in order to solve the above technical problems, the present application provides a deep-sea pressure-resistant lithium battery monomer safety comprehensive evaluation method, which comprises:

[0007] Performing pressurization and depressurization test on the deep-sea pressure-resistant lithium battery monomer to be detected placed in a pressure environment;

[0008] Obtaining voltage data, temperature data and deformation data of the deep-sea pressure-resistant lithium battery monomer to be detected during the pressurization and depressurization test;

[0009] Determining the danger level of the deep-sea pressure-resistant lithium battery monomer to be detected based on the voltage data, the temperature data and the deformation data.

[0010] In a possible implementation manner, the pressurization and depressurization test comprises:

[0011] pressurize the deep-sea pressure-resistant lithium battery cell placed in the pressure environment at a preset pressurization rate;

[0012] when the pressure after pressurization is equal to the preset pressure, maintain the pressure for a preset duration;

[0013] depressurize the deep-sea pressure-resistant lithium battery cell placed in the pressure environment at a preset depressurization rate.

[0014] In a possible implementation, the preset pressurization rate and the preset depressurization rate are both less than or equal to 0.8 MPa / min, and the preset duration is greater than or equal to 30 minutes.

[0015] In a possible implementation, the voltage data includes a pressure drop value, the temperature data includes a temperature change value, and the deformation data includes a deformation amount; and the determining of the danger level of the deep-sea pressure-resistant lithium battery cell based on the voltage data, the temperature data, and the deformation data includes:

[0016] determining whether the pressure drop value is greater than a pressure drop threshold, whether the temperature change value is greater than a temperature change threshold, and whether the deformation amount is greater than a deformation amount threshold;

[0017] when the pressure drop value is greater than the pressure drop threshold, or the temperature change value is greater than the temperature change threshold, or the deformation amount is greater than the deformation amount threshold, the danger level of the deep-sea pressure-resistant lithium battery cell is level three;

[0018] when the pressure drop value is greater than the pressure drop threshold and the temperature change value is greater than the temperature change threshold, or the pressure drop value is greater than the pressure drop threshold and the deformation amount is greater than the deformation amount threshold, or the temperature change value is greater than the temperature change threshold and the deformation amount is greater than the deformation amount threshold, the danger level of the deep-sea pressure-resistant lithium battery cell is level two;

[0019] when the pressure drop value is greater than the pressure drop threshold, the temperature change value is greater than the temperature change threshold, and the deformation amount is greater than the deformation amount threshold, the danger level of the deep-sea pressure-resistant lithium battery cell is level one;

[0020] wherein the danger levels of the level one, the level two, and the level three gradually decrease.

[0021] In a possible implementation, the method further includes:

[0022] during the pressurization and depressurization test, when the danger level of the deep-sea pressure-resistant lithium battery cell is level two or level one, stopping the test and taking out the deep-sea pressure-resistant lithium battery cell from the pressure environment.

[0023] In a possible implementation, the deep-sea pressure-resistant lithium battery cell to be detected is a soft-pack battery.

[0024] In a possible implementation, the method further comprises:

[0025] Performing pressure loading and unloading tests on the lithium iron phosphate battery cell placed in a pressure environment.

[0026] Obtaining comparative voltage data, comparative temperature data, and comparative deformation data of the lithium iron phosphate battery cell during the pressure loading and unloading tests.

[0027] Determining a comparative risk level of the lithium iron phosphate battery cell based on the comparative voltage data, the comparative temperature data, and the comparative deformation data.

[0028] Verifying the reliability of the deep-sea pressure-resistant lithium battery cell to be detected based on the comparative risk level and the risk level.

[0029] In another aspect, the present application also provides a deep-sea pressure-resistant lithium battery cell safety comprehensive evaluation device, comprising:

[0030] A pressure loading and unloading test unit for performing pressure loading and unloading tests on the deep-sea pressure-resistant lithium battery cell to be detected placed in a pressure environment.

[0031] A multi-dimensional data acquisition unit for acquiring voltage data, temperature data, and deformation data of the deep-sea pressure-resistant lithium battery cell to be detected during the pressure loading and unloading tests.

[0032] A risk level determination unit for determining a risk level of the deep-sea pressure-resistant lithium battery cell to be detected based on the voltage data, the temperature data, and the deformation data.

[0033] In another aspect, the present application also provides a lithium battery safety evaluation device, comprising a memory and a processor, wherein,

[0034] The memory is configured to store a program.

[0035] The processor is coupled to the memory and is configured to execute the program stored in the memory to implement the steps of the deep-sea pressure-resistant lithium battery cell safety comprehensive evaluation method in any of the possible implementations.

[0036] In another aspect, the present application also provides a computer-readable storage medium having a program or instructions stored thereon, wherein the program or instructions are executed by a processor to implement the steps of the deep-sea pressure-resistant lithium battery cell safety comprehensive evaluation method in any of the possible implementations.

[0037] The beneficial effects of this invention are as follows: The comprehensive safety assessment method for deep-sea pressure-resistant lithium battery cells provided by this invention simulates the deep-sea environment through pressure loading and unloading tests, and acquires voltage, temperature, and deformation data of the deep-sea pressure-resistant lithium battery cell under test during the pressure loading and unloading test. Compared with the single-dimensional voltage or deformation data in the prior art, the three-dimensional data of voltage, temperature, and deformation can more comprehensively characterize the state of the deep-sea pressure-resistant lithium battery cell under test, improving the comprehensiveness and accuracy of the detection of deep-sea pressure-resistant lithium battery cells. Furthermore, this invention determines the hazard level of the deep-sea pressure-resistant lithium battery cell under test based on voltage, temperature, and deformation data. By integrating the three-dimensional data to obtain the hazard level, the safety of the deep-sea pressure-resistant lithium battery cell is assessed based on the hazard level, improving the intuitiveness of the safety assessment.

[0038] Furthermore, by determining the hazard level of the deep-sea pressure-resistant lithium battery cell to be tested, and by determining the hazard level, the safety of the deep-sea pressure-resistant lithium battery cell can be guaranteed, thus ensuring the safe and stable operation of the deep-sea pressure-resistant lithium battery cell under deep-sea pressure environment. Attached Figure Description

[0039] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0040] Figure 1 A schematic flowchart of an embodiment of the comprehensive safety evaluation method for deep-sea pressure-resistant lithium battery cells provided by the present invention;

[0041] Figure 2 A schematic diagram of an embodiment of the placement of the temperature detection device, deformation detection device, and voltage detection device provided by the present invention;

[0042] Figure 3 This is a schematic diagram of an embodiment of the pressure loading and unloading test provided by the present invention;

[0043] Figure 4 For the present invention Figure 1 A schematic flowchart of an embodiment of step S103;

[0044] Figure 5 A schematic flowchart of an embodiment of the present invention for verifying the reliability of a deep-sea pressure-resistant lithium battery cell to be tested;

[0045] Figure 6 A schematic diagram of an embodiment of the comprehensive safety evaluation device for deep-sea pressure-resistant lithium battery cells provided by the present invention;

[0046] Figure 7 This is a schematic diagram of an embodiment of the lithium battery safety assessment device provided by the present invention. Detailed Implementation

[0047] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0048] It should be understood that the illustrative drawings are not drawn to scale. The flowcharts used in this invention illustrate operations implemented according to some embodiments of the invention. It should be understood that the operations in the flowcharts may be implemented out of order, and steps without logical contextual relationships may be reversed or performed simultaneously. Furthermore, those skilled in the art, guided by the content of this invention, may add one or more other operations to the flowcharts, or remove one or more operations from the flowcharts. Some block diagrams shown in the drawings are functional entities and do not necessarily correspond to physically or logically independent entities. These functional entities may be implemented in software, in one or more hardware modules or integrated circuits, or in different network and / or processor systems and / or microcontroller systems.

[0049] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the invention. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0050] This invention provides a method and apparatus for comprehensive safety evaluation of deep-sea pressure-resistant lithium battery cells, which will be described below.

[0051] Figure 1 A schematic diagram of an embodiment of the comprehensive safety assessment of deep-sea high-voltage lithium battery cells provided by the present invention is shown below. Figure 1 As shown, the comprehensive safety assessment method for deep-sea high-voltage lithium battery cells includes:

[0052] S101. Perform pressure loading and unloading tests on the deep-sea pressure-resistant lithium battery cell to be tested, which is placed in a pressure environment.

[0053] S102, acquire voltage data, temperature data and deformation data of the deep-sea pressure-resistant lithium battery monomer to be detected in the pressure loading and unloading test process;

[0054] S103, determine the danger level of the deep-sea pressure-resistant lithium battery monomer to be detected based on the voltage data, the temperature data and the deformation data.

[0055] In order to acquire the voltage data, the temperature data and the deformation data in the pressure loading and unloading test process, in the specific embodiment of the present application, before step S101, the temperature detection device, the deformation detection device and the voltage detection device need to be installed on the deep-sea pressure-resistant lithium battery monomer to be detected. In the pressure loading and unloading test process, the voltage data, the temperature data and the deformation data are acquired in real time through the temperature detection device, the deformation detection device and the voltage detection device.

[0056] Specifically, the temperature detection device is a temperature sensor, the voltage detection device is a voltage sensor, and the deformation detection device is a strain gauge.

[0057] In the specific embodiment of the present application, the setting positions of the temperature detection device, the deformation detection device and the voltage detection device are as shown in Figure 2 The two ends of the voltage detection device are connected to the positive and negative electrodes of the deep-sea pressure-resistant lithium battery monomer to be detected. The temperature detection device and the deformation detection device are arranged in the middle part of the deep-sea pressure-resistant lithium battery monomer to be detected.

[0058] It should be noted that: since the deep-sea pressure-resistant lithium battery monomer to be detected has a certain volume, in order to realize the accuracy of the temperature data, as shown in Figure 2 The temperature data of the deep-sea pressure-resistant lithium battery monomer to be detected is the average temperature of the detection results of the three temperature detection devices.

[0059] In order to improve the accuracy of the acquired temperature, deformation and voltage data, the detection accuracy of the temperature detection device, the deformation detection device and the voltage detection device should meet the requirements. Specifically, the accuracy of the voltage detection device is not less than 1mV.

[0060] Among them, the deep-sea pressure-resistant lithium battery monomer can be any one of lithium primary battery or lithium ion battery.

[0061] Compared with the prior art, the deep-sea pressure-resistant lithium battery monomer safety comprehensive evaluation method provided by the embodiment of the present application simulates the deep-sea environment by carrying out pressure loading and unloading test in a pressure environment, and obtains voltage data, temperature data and deformation data of the deep-sea pressure-resistant lithium battery monomer to be detected during the pressure loading and unloading test. Compared with the voltage or deformation data in a single dimension in the prior art, the data in three dimensions of voltage, temperature and deformation can more comprehensively characterize the state of the deep-sea pressure-resistant lithium battery monomer to be detected, and improve the comprehensiveness and accuracy of the detection of the deep-sea pressure-resistant lithium battery monomer. Moreover, the embodiment of the present application determines the danger level of the deep-sea pressure-resistant lithium battery monomer to be detected based on the voltage data, the temperature data and the deformation data, obtains the danger level by integrating the data in three dimensions, and evaluates the safety of the deep-sea pressure-resistant lithium battery monomer by the danger level, thereby improving the intuitiveness of the safety evaluation.

[0062] Further, the embodiment of the present application determines the danger level of the deep-sea pressure-resistant lithium battery monomer to be detected, and determines the safety of the deep-sea pressure-resistant lithium battery monomer by the danger level, so as to ensure the safe and stable operation of the deep-sea pressure-resistant lithium battery monomer under the deep-sea pressure environment.

[0063] In some embodiments of the present application, as shown in Figure 3 the pressure loading and unloading test comprises:

[0064] S301, pressure loading is performed on the deep-sea pressure-resistant lithium battery monomer to be detected placed in a pressure environment at a preset pressure loading rate;

[0065] S302, when the pressure after the pressure loading is equal to a preset pressure, pressure maintaining is performed for a preset time length;

[0066] S303, pressure unloading is performed on the deep-sea pressure-resistant lithium battery monomer to be detected placed in the pressure environment at a preset pressure unloading rate.

[0067] It should be noted that the purpose of the pressure loading and unloading test is to simulate the deep-sea environment, and therefore, each parameter in the pressure loading and unloading test needs to be set according to the deep-sea environment.

[0068] In specific embodiments of the present application, the preset pressure loading rate and the preset pressure unloading rate are both less than or equal to 0.8 MPa / min, and the preset time length is greater than or equal to 30 minutes.

[0069] The preset pressure is any value between 0 and 115 MPa.

[0070] Since the deep-sea pressure-resistant lithium battery monomer will have internal short circuit under super-high pressure, at this time, the voltage, temperature and deformation data specifically show that the voltage sharply decreases, the temperature rapidly rises, and then serious bulging phenomenon (large deformation) occurs. That is, the voltage, temperature and deformation data focus on the pressure drop, temperature change value and deformation.

[0071] Therefore, the voltage data includes the voltage drop value, the temperature data includes the temperature change value, and the deformation data includes the deformation value; and as shown in Figure 4 Step S103 includes:

[0072] S401, judging whether the voltage drop value is greater than a voltage drop threshold, whether the temperature change value is greater than a temperature change threshold, and whether the deformation value is greater than a deformation threshold;

[0073] S402, when the voltage drop value is greater than the voltage drop threshold, or the temperature change value is greater than the temperature change threshold, or the deformation value is greater than the deformation threshold, the risk level of the deep-sea pressure-resistant lithium battery cell to be detected is level three.

[0074] S403, when the voltage drop value is greater than the voltage drop threshold and the temperature change value is greater than the temperature change threshold, or the voltage drop value is greater than the voltage drop threshold and the deformation value is greater than the deformation threshold, or the temperature change value is greater than the temperature change threshold and the deformation value is greater than the deformation threshold, the risk level of the deep-sea pressure-resistant lithium battery cell to be detected is level two.

[0075] S404, when the voltage drop value is greater than the voltage drop threshold, the temperature change value is greater than the temperature change threshold, and the deformation value is greater than the deformation threshold, the risk level of the deep-sea pressure-resistant lithium battery cell to be detected is level one.

[0076] The risk levels of level one, level two, and level three gradually decrease.

[0077] In other words, when one of the voltage drop value, the temperature change value, and the deformation value is greater than the corresponding threshold, the risk level is the lighter level one; when any two of the voltage drop value, the temperature change value, and the deformation value are greater than the corresponding threshold, the risk level is level two; and when all of the voltage drop value, the temperature change value, and the deformation value are greater than the corresponding threshold, the risk level is the most serious level one.

[0078] In specific embodiments of the present application, the voltage drop threshold is 2 mV, and the temperature change threshold is 10°C. In theory, when the deep-sea pressure-resistant lithium battery cell to be detected is swollen, the resistance of the strain gauge is infinite, and therefore, the deformation value can be set according to the actual application scenario, which is not described here.

[0079] Since the deep-sea pressure-resistant lithium battery cell to be detected will be damaged when the risk level is level two or level one, which may cause leakage of chemical substances and safety problems, in order to avoid this problem, in some embodiments of the present application, the deep-sea pressure-resistant lithium battery cell safety comprehensive evaluation method further includes:

[0080] During the pressure loading and unloading test, when the risk level of the deep-sea pressure-resistant lithium battery cell to be detected is level two or level one, the test is stopped, and the deep-sea pressure-resistant lithium battery cell to be detected is taken out of the pressure environment.

[0081] The embodiment of the present application stops the test when the risk level of the deep-sea pressure-resistant lithium battery monomer to be detected is two or one, avoids further damage to the deep-sea pressure-resistant lithium battery monomer to be detected, prevents chemical leakage, ensures the safety of the tester during the test, and avoids pollution to the pressure environment.

[0082] In the preferred embodiment of the present application, the deep-sea pressure-resistant lithium battery monomer to be detected is a soft-pack battery due to the characteristics of flexible design, light weight, small internal resistance, non-explosiveness, high cycle times, good safety performance, large capacity, and high energy density.

[0083] To verify the reliability of the deep-sea pressure-resistant lithium battery monomer to be detected, in some embodiments of the present application, as shown in FIG. 1, the deep-sea pressure-resistant lithium battery monomer safety comprehensive evaluation method further comprises: Figure 5

[0084] S501, performing pressure loading and unloading test on the lithium iron phosphate battery monomer placed in the pressure environment;

[0085] S502, obtaining comparative voltage data, comparative temperature data, and comparative deformation data of the lithium iron phosphate battery monomer during the pressure loading and unloading test;

[0086] S503, determining the comparative risk level of the lithium iron phosphate battery monomer based on the comparative voltage data, the comparative temperature data, and the comparative deformation data;

[0087] S504, verifying the reliability of the deep-sea pressure-resistant lithium battery monomer to be detected based on the comparative risk level and the risk level.

[0088] Since the pressure resistance of the conventional lithium iron phosphate battery monomer is poorer than that of the deep-sea pressure-resistant lithium battery monomer, the risk level of the comparative risk level should be higher than that of the risk level under the same pressure loading and unloading test conditions. Based on this, step S504 is specifically: judging whether the risk level is greater than the comparative risk level, when it is greater, the reliability of the deep-sea pressure-resistant lithium battery monomer to be detected is higher.

[0089] Further, the comparative voltage data, the comparative temperature data, and the comparative deformation data should all be greater than the voltage data, the temperature data, and the deformation data.

[0090] In a specific embodiment of the present application, one 62Ah deep-sea pressure-resistant lithium iron phosphate battery monomer (denoted as monomer A) and one 55Ah conventional lithium iron phosphate battery monomer (denoted as monomer B) are taken for pressure loading and unloading test, and the batteries are in full charge state. The specific pressure loading and unloading test process is as follows:

[0091] First, place monomer A and monomer B in the pressure environment respectively, start the pressure loading system, and pressurize at a rate of 2MPa / min; ​

[0092] Second step: when the pressure reaches 60 MPa, keep pressure for 30 minutes;

[0093] Third step: unload to normal pressure at the rate of 2 MPa / min.

[0094] During the pressure loading and unloading process, the voltage, temperature and deformation of monomer A and monomer B are detected, and the test results are shown in Table 1:

[0095] Table 1 Test results

[0096]

[0097] Among them, the danger level of monomer A is represented by " / " which means that the pressure drop value is less than the pressure drop threshold value, the temperature change value is less than the temperature change threshold value, and the deformation amount is less than the deformation threshold value.

[0098] As can be seen from Table 1, compared with the lithium iron phosphate battery monomer, the pressure resistance performance of the deep-sea pressure-resistant lithium battery monomer is better.

[0099] In summary, the deep-sea pressure-resistant lithium battery monomer safety comprehensive evaluation method provided by the embodiment of the application can comprehensively evaluate the safety of the battery monomer by detecting the voltage, temperature, deformation and other signals of the deep-sea pressure-resistant lithium battery monomer, and give a danger level, so that professional personnel can handle it in time when the battery fails, greatly reducing the use risk of the deep-sea pressure-resistant lithium battery monomer in the deep-sea pressure environment, and further improving the use safety of the deep-sea pressure-resistant lithium battery monomer.

[0100] In order to better implement the deep-sea pressure-resistant lithium battery monomer safety comprehensive evaluation method in the embodiment of the application, on the basis of the deep-sea pressure-resistant lithium battery monomer safety comprehensive evaluation method, correspondingly, the embodiment of the application also provides a deep-sea pressure-resistant lithium battery monomer safety comprehensive evaluation device, as shown in Figure 6 The deep-sea pressure-resistant lithium battery monomer safety comprehensive evaluation device 600 comprises:

[0101] The pressure loading and unloading test unit 601 is used for pressure loading and unloading test on the deep-sea pressure-resistant lithium battery monomer to be detected placed in a pressure environment;

[0102] The multi-dimensional data acquisition unit 602 is used for acquiring voltage data, temperature data and deformation data of the deep-sea pressure-resistant lithium battery monomer to be detected in the pressure loading and unloading test process;

[0103] The danger level determination unit 603 is used for determining the danger level of the deep-sea pressure-resistant lithium battery monomer to be detected based on the voltage data, temperature data and deformation data.

[0104] It should be noted that the deep-sea pressure-resistant lithium battery monomer safety comprehensive evaluation device 600 provided in the above embodiment can implement the technical solutions described in the deep-sea pressure-resistant lithium battery monomer safety comprehensive evaluation method embodiment, and the principles or specific implementation details of the above modules or units can be referred to the corresponding content in the deep-sea pressure-resistant lithium battery monomer safety comprehensive evaluation method embodiment, which will not be repeated here.

[0105] As shown in Figure 7 The present application also provides a lithium battery safety evaluation device 700. The lithium battery safety evaluation device 700 includes a processor 701, a memory 702, and a display 703. Figure 7 Only part of the components of the lithium battery safety evaluation device 700 are shown, but it should be understood that all the components shown are not required, and more or less components can be implemented instead.

[0106] The processor 701 can be a central processing unit (CPU), a microprocessor or other data processing chip in some embodiments, used to run the program code or process data stored in the memory 702, such as the deep-sea pressure-resistant lithium battery monomer safety comprehensive evaluation method in the present application.

[0107] In some embodiments of the present application, the processor 701 can be a single server or a server group. The server group can be centralized or distributed. In some embodiments, the processor 701 can be local or remote. In some embodiments, the processor 701 can be implemented in a cloud platform. In an embodiment, the cloud platform can include a private cloud, a public cloud, a hybrid cloud, a community cloud, a distributed cloud, an internal cloud, a multiple cloud, etc., or any combination thereof.

[0108] The memory 702 can be an internal storage unit of the lithium battery safety evaluation device 700 in some embodiments, such as a hard disk or memory of the lithium battery safety evaluation device 700.

[0109] Further, the memory 702 can include both the internal storage unit of the lithium battery safety evaluation device 700 and the external storage device. The memory 702 is used to store application software and various data installed in the lithium battery safety evaluation device 700.

[0110] The display 703 can be an LED display, a liquid crystal display, a touch liquid crystal display, an OLED (Organic Light-Emitting Diode) touch, etc. in some embodiments. The display 703 is used to display information of the lithium battery safety evaluation device 700 and to display a visualized user interface. The components 701-703 of the lithium battery safety evaluation device 700 communicate with each other through a system bus.

[0111] In some embodiments of the present application, the following steps can be implemented when the processor 701 executes the deep-sea pressure-resistant lithium battery monomer safety comprehensive evaluation program in the memory 702:

[0112] Performing pressure loading and unloading test on the deep-sea pressure-resistant lithium battery monomer to be detected placed in a pressure environment;

[0113] Obtaining voltage data, temperature data and deformation data of the deep-sea pressure-resistant lithium battery monomer to be detected during the pressure loading and unloading test;

[0114] Determining the danger level of the deep-sea pressure-resistant lithium battery monomer to be detected based on the voltage data, the temperature data and the deformation data.

[0115] It should be understood that, in addition to the above functions, the processor 701 can also implement other functions when executing the deep-sea pressure-resistant lithium battery monomer safety comprehensive evaluation program in the memory 702. For details, please refer to the description of the corresponding method embodiments.

[0116] Correspondingly, the present application also provides a computer readable storage medium for storing computer readable programs or instructions, which can implement the steps or functions of the deep-sea pressure-resistant lithium battery monomer safety comprehensive evaluation method provided by the above method embodiments when executed by the processor.

[0117] Those skilled in the art can understand that all or part of the processes of the above embodiments can be completed by a computer program to instruct related hardware (such as a processor, a controller, etc.) to complete. The computer program can be stored in a computer readable storage medium. The computer readable storage medium includes a magnetic disk, an optical disk, a read-only memory or a random access memory, etc.

[0118] The above provides a detailed description of the deep-sea pressure-resistant lithium battery monomer safety comprehensive evaluation method and device. The specific examples are applied to the principle and implementation of the present application. The above embodiment is only used to help understand the method and its core idea. Meanwhile, for those skilled in the art, according to the idea of the present application, the specific implementation and application range will be changed. The above description should not be understood as a limitation of the present application.

Claims

1. A method for comprehensive evaluation of safety of deep-sea pressure-resistant lithium battery monomer, characterized in that, The method comprises the following steps: pressure test is performed on the deep-sea pressure-resistant lithium battery cell to be detected placed in a pressure environment; obtaining voltage data, temperature data and deformation data of the deep-sea pressure-resistant lithium battery cell to be detected during the pressure test; determining the danger level of the deep-sea pressure-resistant lithium battery cell to be detected based on the voltage data, the temperature data and the deformation data; the voltage data includes a pressure drop value, the temperature data includes a temperature change value, and the deformation data includes a deformation value; the determination of the danger level of the deep-sea pressure-resistant lithium battery cell to be detected based on the voltage data, the temperature data and the deformation data comprises: determining whether the pressure drop value is greater than a pressure drop threshold value, whether the temperature change value is greater than a temperature change threshold value, and whether the deformation value is greater than a deformation threshold value; when the pressure drop value is greater than the pressure drop threshold value, or the temperature change value is greater than the temperature change threshold value, or the deformation value is greater than the deformation threshold value, the danger level of the deep-sea pressure-resistant lithium battery cell to be detected is level three; when the pressure drop value is greater than the pressure drop threshold value and the temperature change value is greater than the temperature change threshold value, or the pressure drop value is greater than the pressure drop threshold value and the deformation value is greater than the deformation threshold value, or the temperature change value is greater than the temperature change threshold value and the deformation value is greater than the deformation threshold value, the danger level of the deep-sea pressure-resistant lithium battery cell to be detected is level two; when the pressure drop value is greater than the pressure drop threshold value, the temperature change value is greater than the temperature change threshold value, and the deformation value is greater than the deformation threshold value, the danger level of the deep-sea pressure-resistant lithium battery cell to be detected is level one; wherein the danger levels of the level one, level two and level three gradually decrease.

2. The method for comprehensive evaluation of safety of deep-sea pressure-resistant lithium battery cells according to claim 1, characterized in that, The pressure test comprises: pressurizing the deep-sea pressure-resistant lithium battery cell to be detected placed in the pressure environment at a preset pressurizing rate; maintaining the pressure for a preset time period when the pressure after pressurizing is equal to a preset pressure; depressurizing the deep-sea pressure-resistant lithium battery cell to be detected placed in the pressure environment at a preset depressurizing rate.

3. The method according to claim 2, wherein, The preset pressurizing rate and the preset depressurizing rate are both less than or equal to 0.8 MPa / min, and the preset time period is greater than or equal to 30 minutes.

4. The method for comprehensive evaluation of safety of deep-sea pressure-resistant lithium battery cells according to claim 1, characterized in that, The method further comprises: during the pressure test, when the danger level of the deep-sea pressure-resistant lithium battery cell to be detected is level two or level one, stopping the test and taking out the deep-sea pressure-resistant lithium battery cell to be detected from the pressure environment. 5.The method for comprehensive evaluation of safety of deep-sea pressure-resistant lithium battery cells according to claim 1, wherein, The deep-sea pressure-resistant lithium battery cell to be detected is a soft-packaged battery. 6.The method for comprehensive evaluation of safety of deep-sea pressure-resistant lithium battery cells according to claim 1, wherein, The method further comprises: pressure test is performed on a lithium iron phosphate battery cell placed in a pressure environment; obtaining comparative voltage data, comparative temperature data and comparative deformation data of the lithium iron phosphate battery cell during the pressure test; determining a comparative danger level of the lithium iron phosphate battery cell based on the comparative voltage data, the comparative temperature data and the comparative deformation data; verifying the reliability of the deep-sea pressure-resistant lithium battery cell to be detected based on the comparative danger level and the danger level.

7. A deep-sea pressure-resistant lithium battery monomer safety comprehensive evaluation device, characterized in that, The method comprises the following steps: a pressure test unit for performing pressure test on a deep-sea pressure-resistant lithium battery cell to be detected placed in a pressure environment; A multi-dimensional data acquisition unit is configured to acquire voltage data, temperature data, and deformation data of the deep-sea pressure-resistant lithium battery cell during the pressure loading and unloading test. A hazard level determination unit is configured to determine a hazard level of the deep-sea pressure-resistant lithium battery cell based on the voltage data, the temperature data, and the deformation data. The voltage data includes a pressure drop value, the temperature data includes a temperature change value, and the deformation data includes a deformation value. The determination of the hazard level of the deep-sea pressure-resistant lithium battery cell based on the voltage data, the temperature data, and the deformation data includes: determining whether the pressure drop value is greater than a pressure drop threshold value, whether the temperature change value is greater than a temperature change threshold value, and whether the deformation value is greater than a deformation threshold value; when the pressure drop value is greater than the pressure drop threshold value, or the temperature change value is greater than the temperature change threshold value, or the deformation value is greater than the deformation threshold value, the hazard level of the deep-sea pressure-resistant lithium battery cell is level three; when the pressure drop value is greater than the pressure drop threshold value and the temperature change value is greater than the temperature change threshold value, or the pressure drop value is greater than the pressure drop threshold value and the deformation value is greater than the deformation threshold value, or the temperature change value is greater than the temperature change threshold value and the deformation value is greater than the deformation threshold value, the hazard level of the deep-sea pressure-resistant lithium battery cell is level two; when the pressure drop value is greater than the pressure drop threshold value, the temperature change value is greater than the temperature change threshold value, and the deformation value is greater than the deformation threshold value, the hazard level of the deep-sea pressure-resistant lithium battery cell is level one; 8. A lithium battery safety evaluation apparatus, characterized by, wherein the hazard levels of the level one, the level two, and the level three gradually decrease. The device includes a memory and a processor. The memory is configured to store a program.

9. A computer-readable storage medium, characterized in that, The processor is coupled to the memory and is configured to execute the program stored in the memory to implement the steps of the deep-sea pressure-resistant lithium battery cell safety comprehensive evaluation method of any one of claims 1 to 6. The computer-readable storage medium stores a program or instructions, which are executed by a processor to implement the steps of the deep-sea pressure-resistant lithium battery cell safety comprehensive evaluation method of any one of claims 1 to 6.

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