CN119395579A - Battery thermal damage consistency test method, system, equipment and medium - Google Patents
Battery thermal damage consistency test method, system, equipment and medium Download PDFInfo
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Abstract
The application discloses a method, a system, equipment and a medium for testing consistency of thermal damage of a battery, wherein the method comprises the steps of obtaining a damaged battery sample; the damaged battery sample is obtained after thermal radiation damage treatment, comprises a plurality of battery cells, internal resistance change values of the battery cells before and after thermal radiation damage are tested by adopting a mixed power pulse characteristic test mode, internal resistance damage consistency results of the damaged battery sample are determined according to the internal resistance change values, pressure drop values of the battery cells before and after thermal radiation damage are tested by adopting a pressure drop test mode, pressure drop damage consistency results of the damaged battery sample are determined according to the pressure drop values, and thermal damage consistency results of the damaged battery sample are obtained according to the internal resistance damage consistency results and the pressure drop damage consistency results. According to the scheme, the heat damage consistency result of the damaged battery sample can be determined more comprehensively and accurately, and good data support is provided for the design and development of the subsequent battery.
Description
Technical Field
The invention relates to the technical field of battery testing, in particular to a method, a system, equipment and a medium for testing consistency of thermal damage of batteries.
Background
With the rapid development of electric vehicles, lithium ion batteries have been increasingly used in everyday vehicles as a clean energy storage carrier for electric vehicles due to their high energy density, excellent cycle life and low self-discharge capability. However, in the actual use process, the battery performance is reduced and even the battery is exploded due to mechanical damage, quick charge damage, manufacturing damage, etc., seriously affecting the safety and reliability of the battery, wherein when a fire event occurs in surrounding vehicles, a large amount of heat is generated, causing adjacent vehicles to be subjected to heat radiation, causing thermal runaway phenomenon. In order to ensure the safety performance of the battery under extreme conditions, it is particularly important to perform thermal damage consistency tests on the battery.
At present, the reaction of the battery under different heat faults can be simulated by adopting an external heating method, an extrusion experiment and the like in the related technology, however, the scheme needs to rely on subjective experience, so that the consistency test accuracy of the heat damage of the battery is poor.
Disclosure of Invention
In view of the foregoing drawbacks or shortcomings of the prior art, it is desirable to provide a battery thermal damage consistency test method, system, apparatus, and medium.
In a first aspect, the present invention provides a method for testing consistency of thermal damage to a battery, the method comprising:
Obtaining a damaged battery sample, wherein the damaged battery sample is obtained after thermal radiation damage treatment, and comprises a plurality of battery monomers;
Testing the internal resistance change values of each battery monomer before and after the battery monomer is damaged by heat radiation by adopting a mixed power pulse characteristic test mode, and determining an internal resistance damage consistency result of the damaged battery sample according to the internal resistance change values;
Adopting a pressure drop test mode to test the pressure drop value of each battery monomer before and after being damaged by heat radiation, and determining a pressure drop damage consistency result of the damaged battery sample according to the pressure drop value;
And obtaining a thermal damage consistency result of the damaged battery sample according to the internal resistance damage consistency result and the pressure drop damage consistency result.
In one embodiment, the testing the internal resistance change value of each battery cell after being damaged by heat radiation by adopting a hybrid power pulse characteristic testing mode includes:
At a preset temperature, carrying out standard cycle capacity test on each battery monomer in the damaged battery sample, and determining the battery calibration capacity of each battery monomer;
Performing HPPC step tests on each battery cell according to the battery calibration capacity at a plurality of preset SOC points to obtain HPPC test results corresponding to each battery cell at each SOC point;
fitting the HPPC test results corresponding to the SOC points of each charge state to obtain a first internal resistance value of each battery cell;
Acquiring a second internal resistance value of each battery monomer before being damaged by heat radiation;
and obtaining the internal resistance change value of each battery cell according to the first internal resistance value and the second internal resistance value.
In one embodiment, performing HPPC step test on each battery cell to obtain an HPPC test result corresponding to each SOC point of the damaged battery sample, where the HPPC test result includes:
discharging the damaged battery sample at a first preset constant current value after standing for preset time at each preset SOC point until the charge quantity of the damaged battery sample reaches a target discharge capacity, wherein the target discharge capacity is smaller than the battery calibration capacity;
discharging the damaged battery sample by a second preset constant value after standing for a first preset time, wherein the second preset constant value is larger than the first preset constant value;
and after standing for a first preset time, charging the damaged battery sample with the second preset constant current value, and recording an HPPC test result corresponding to the damaged battery sample at the preset SOC point.
In one embodiment, determining the internal resistance damage consistency result of the damaged battery sample according to the internal resistance change value includes:
Determining an internal resistance change average value according to the battery change values of the battery monomers;
Determining the internal resistance deviation of each battery monomer before and after the damage of the heated radiation based on the battery variation value and the internal resistance variation average value of each battery monomer;
determining a target internal resistance deviation with the maximum value from the internal resistance deviations;
and determining an internal resistance damage consistency result of the damaged battery sample according to the target internal resistance deviation.
In one embodiment, the voltage drop test method is used to test the voltage drop value of each battery cell before and after the battery cell is damaged by heat radiation, and the method includes:
After each battery cell is kept stand for a second preset time, testing each battery cell by adopting a voltage drop test mode to obtain a first voltage value of each battery cell;
acquiring a second voltage value of each battery cell before being damaged by heat radiation;
And obtaining the voltage drop value of each battery cell according to the first voltage value and the second voltage value.
In one embodiment, determining a pressure drop damage consistency result for the damaged cell sample from the pressure drop value comprises:
determining a pressure drop average value according to the pressure drop values of the battery monomers;
determining voltage deviation of each battery cell before and after the damage of the heated radiation based on the voltage drop value of each battery cell and the voltage drop average value;
Determining a target voltage deviation with the largest value from the voltage deviations;
And determining a voltage drop damage consistency result of the damaged battery sample according to the target voltage deviation.
In one embodiment, obtaining the thermal damage consistency result of the damaged battery sample according to the internal resistance damage consistency result and the pressure drop damage consistency result comprises:
Determining a minimum value from the internal resistance damage consistency result and the pressure drop damage consistency result;
Comparing the minimum value with a preset threshold value;
And when the minimum value is larger than the preset threshold value, the heat damage consistency result of the damaged battery sample is valid.
In a second aspect, embodiments of the present application provide a battery thermal damage consistency test system, the system comprising:
The device comprises an acquisition module, a detection module and a detection module, wherein the acquisition module is used for acquiring a damaged battery sample, the damaged battery sample is obtained after thermal radiation damage treatment, and the damaged battery sample comprises a plurality of battery monomers;
The first determining module is used for testing the internal resistance change values of each battery monomer before and after the battery monomer is damaged by heat radiation in a mixed power pulse characteristic test mode, and determining an internal resistance damage consistency result of the damaged battery sample according to the internal resistance change values;
The second determining module is used for testing the pressure drop value of each battery monomer before and after the battery monomer is damaged by heat radiation in a pressure drop test mode, and determining a pressure drop damage consistency result of the damaged battery sample according to the pressure drop value;
and the result determining module is used for obtaining the thermal damage consistency result of the damaged battery sample according to the internal resistance damage consistency result and the pressure drop damage consistency result.
In a third aspect, an embodiment of the present application provides a computer device, including a memory, a processor, and a computer program stored on the memory and executable on the processor, where the processor executes the computer program to implement the method for testing the consistency of thermal damage of a battery provided by the above embodiment.
In a fourth aspect, embodiments of the present application provide a computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements the battery thermal damage consistency test method provided by the above embodiments.
The method comprises the steps of obtaining a damaged battery sample, wherein the damaged battery sample is obtained after thermal radiation damage treatment, the damaged battery sample comprises a plurality of battery cells, testing internal resistance change values of each battery cell before and after thermal radiation damage by adopting a hybrid power pulse characteristic test method, determining an internal resistance damage consistency result of the damaged battery sample according to the internal group change values, testing pressure drop values of each battery cell before and after thermal radiation damage by adopting a pressure drop test method, determining a pressure drop damage consistency result of the damaged battery sample according to the pressure drop values, and further obtaining a thermal damage consistency result of the damaged battery sample according to the internal resistance damage consistency result and the pressure drop damage consistency result. Compared with the prior art, on one hand, the technical scheme can more comprehensively evaluate the internal resistance change value by adopting a hybrid power pulse characteristic test mode to test the battery monomer, accurately determine the internal resistance damage consistency result based on the internal resistance change value, and rapidly determine the pressure drop value of the battery monomer by adopting a pressure drop test mode, so that the pressure drop damage consistency result is accurately determined, data guidance information is provided for the determination of the subsequent thermal damage consistency result, and on the other hand, the determined thermal damage consistency result accuracy is higher based on the internal resistance damage consistency result and the pressure drop damage consistency result, and good data support is provided for the design and development of the subsequent battery.
Drawings
Other features, objects and advantages of the present application will become more apparent upon reading of the detailed description of non-limiting embodiments, made with reference to the accompanying drawings in which:
fig. 1 is a schematic diagram of an application environment of a battery thermal damage consistency test system according to an embodiment of the present application;
FIG. 2 is a schematic diagram of a battery thermal damage consistency test system according to another embodiment of the present application;
FIG. 3 is a schematic flow chart of a method for testing consistency of thermal damage of a battery according to an embodiment of the present application;
Fig. 4 is a schematic structural diagram of a temperature sensor arrangement of a battery according to an embodiment of the present application;
Fig. 5 is a schematic flow chart of a method for determining internal resistance change values of each battery cell according to an embodiment of the present application;
fig. 6 is a flow chart illustrating a method for determining a voltage drop value of each battery cell according to an embodiment of the present application;
fig. 7 is a schematic structural diagram of a method for testing consistency of thermal damage of a battery according to an embodiment of the present application;
Fig. 8 is a schematic structural diagram of a battery thermal damage consistency test device according to an embodiment of the present application;
fig. 9 is a schematic structural diagram of a computer device according to an embodiment of the present application.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
The foregoing objects, features, and advantages of the application will be more readily apparent from the following detailed description of the application when taken in conjunction with the accompanying drawings and detailed description.
The application environment of the battery thermal damage consistency test system provided by the embodiment of the application can be seen as shown in fig. 1. The application environment includes a damaged battery sample 10, a heat radiation device 20, and a computer device 30, where the computer device 30 is respectively connected with the damaged battery sample 10 and the heat radiation device 20, and the damaged battery sample 10 may be located above the heat radiation device during the damage process of heat radiation.
The damaged battery sample 10 includes a plurality of battery cells 11, and the heat radiation device 20 includes a plurality of oil cells 21, which may be the same or different in size. Gasoline can be arranged in each oil cell to create an environment for thermal radiation damage of the battery.
It can be understood that the sizes of the battery cells 11 in the damaged battery sample 10 may be the same or different, and may be sequentially arranged, for example, 10 battery cells with the same size and attribute may be provided, or 5 battery cells with the same size and attribute may be provided. The damaged battery sample 10 may be provided in the whole vehicle and subjected to the heat radiation damage treatment, or may be subjected to the heat radiation damage treatment alone.
Referring to fig. 2, the battery to be damaged may be a battery pack with a battery cell arranged in a whole vehicle, and gasoline may be placed in the oil grids at the right side, the left side and the bottom of the heat radiation device 20, and the gasoline is ignited and burned for a preset time, so as to damage the battery to be damaged by heat radiation, thereby obtaining the damaged battery cell 10. The preset time may be set in a user-defined manner according to specific experiment requirements, for example, may be 180s.
The computer device 30 is used for testing internal resistance change values of each battery cell before and after thermal radiation damage by adopting a hybrid power pulse characteristic test mode, determining internal resistance damage consistency results of damaged battery samples according to the internal resistance change values, testing pressure drop values of each battery cell before and after the thermal radiation damage by adopting a pressure drop test mode, determining pressure drop damage consistency results of the damaged battery samples according to the pressure drop values, and obtaining thermal damage consistency results of the damaged battery samples according to the internal resistance damage consistency results and the pressure drop damage consistency results.
The computer device 30 has data control and data processing functions and may include a server and a terminal for establishing a communication connection with the server. The computer device 30 may be configured with test control software for controlling the overall test process, including the processing of the collected data and analysis of the results, and for recording test conditions and results to generate a report meeting specifications.
Optionally, the server may be a server, a server cluster or a distributed system formed by a plurality of servers, or a cloud server that provides cloud services, cloud databases, cloud computing, cloud functions, cloud storage, network services, cloud communication, middleware services, domain name services, security services, a content distribution network (Content Delivery Network, CDN), and basic cloud computing services such as big data and an artificial intelligence platform. The terminal may be operated with an operating system, where the operating system may include, but is not limited to, an android system, an IOS system, a Linux system, a Unix system, a Windows system, and the like, and may further include a User Interface (UI) layer, through which display of data may be provided to the outside, and further may send a control instruction to the heat radiation apparatus 20 based on an application program Interface (Application Programming Interface, API), so that the heat radiation apparatus 20 receives and responds to the control instruction, and performs a corresponding heat radiation damage operation on the battery to be damaged, to obtain a damaged battery sample.
The server and the terminal can be internally provided with a Microprocessor (MCU), a memory (ROM, RAM), an input/output interface (I/O), an analog-to-digital converter (A/D), and large-scale integrated circuits such as shaping, driving and the like.
In an exemplary embodiment, as shown in fig. 3, a method for testing the consistency of thermal damage of a battery is provided, which is executed by a computer device, specifically, may be executed by a terminal or a server, or may be executed by the terminal and the server together, and in an embodiment of the present application, the method is applied to the computer device 30 in fig. 1, and is described as an example, and includes the following steps S201 to S204. Wherein:
Step S201, obtaining a damaged battery sample, wherein the damaged battery sample is obtained after thermal radiation damage treatment, and comprises a plurality of battery monomers.
It should be noted that, the damaged battery sample is a battery subjected to thermal radiation damage treatment, and the damaged battery sample may be a lithium ion battery, which includes a plurality of lithium ion battery monomers and may further include a lithium ion battery module. The number of the lithium ion battery cells can be set in a self-defined manner according to actual test requirements, for example, 5, 8 or 10 lithium ion battery cells can be set.
In the process of acquiring the battery to be damaged, the battery to be damaged is firstly acquired, the battery to be damaged is placed in the whole vehicle, then the whole vehicle is placed on a heat radiation device, the oil grid at the bottom of the whole vehicle is filled with gasoline, and then the gasoline is ignited and kept burning for a preset time, so that the battery to be damaged is subjected to heat radiation damage, and a damaged battery sample is obtained.
As another implementation manner, after the battery to be damaged is obtained, the battery to be damaged is placed in the whole vehicle, then the whole vehicle is placed on the heat radiation device, the oil grid positioned on the side of the whole vehicle is filled with gasoline, and then the gasoline is ignited and kept burned for a preset time, so that the battery to be damaged is subjected to heat radiation damage, and a damaged battery sample is obtained. The preset time can be set in a self-defined mode according to actual requirements.
It can be understood that the degree of thermal radiation damage and the area of thermal radiation damage to the battery of the whole vehicle after the gasoline at different fuel cell positions is ignited may be different, for example, when the gasoline in the fuel cell at the bottom of the whole vehicle burns, the bottom of the corresponding damaged battery sample may be damaged to a larger extent and area, and when the gasoline in the fuel cell at the side of the whole vehicle burns, the side of the corresponding damaged battery sample may be damaged to a larger extent and area.
Step S202, testing the internal resistance change values of each battery monomer before and after being damaged by heat radiation by adopting a hybrid power pulse characteristic test mode, and determining an internal resistance damage consistency result of a damaged battery sample according to the internal resistance change values.
Specifically, after the battery to be damaged is obtained, a hybrid power pulse characteristic test mode can be adopted to test a damaged battery sample, so that an internal resistance value of each battery monomer after being damaged by heat radiation is obtained, an internal resistance change value is determined based on the internal resistance value before being damaged by heat radiation, and then the internal resistance change value is analyzed, so that an internal resistance damage consistency result of the damaged battery sample is obtained.
It should be noted that, the internal resistance damage uniformity result of the damaged battery sample refers to uniformity of each battery cell in the damaged battery sample among different battery cells after the internal resistance of the battery changes. It is important to evaluate the overall performance, reliability and safety of damaged battery samples.
Taking a damaged battery sample as a lithium ion battery as an example, a hybrid pulse power characteristic test experiment (Hybrid Pulse Power Characterization, hppc), namely for electrochemical energy storage systems such as the lithium ion battery, the internal resistance characteristics of the battery under different states of charge (SOC) can be accurately obtained through an HPPC experiment, and the internal resistance value of the battery is one of key indexes for measuring the performance of the battery, and can comprise ohmic internal resistance and polarization internal resistance values. The ohmic internal resistance mainly comes from the resistance of the components such as electrode materials, electrolyte, diaphragms and the like in the battery, and the polarized internal resistance value is related to the electrochemical reaction process in the battery.
In order to study the effect of temperature on the HPPC characteristics of the battery or to ensure that the experiment is performed under specific temperature conditions, a temperature control device, such as a thermostat, may be used. The incubator can control the battery environment temperature within a set range, for example, between 25 ℃ and 60 ℃ to simulate the performance of the battery under different working environments, and a temperature sensor, such as a k-type thermocouple temperature sensor, can be arranged on the damaged battery sample to measure the temperature by the temperature sensor, as shown in fig. 4. The damaged battery sample can be provided with temperature sensors at a plurality of points, and the points can sequentially comprise four points corresponding to the marks, wherein the mark 1 is a large-surface center point, the mark 2 is a positive electrode, the mark 3 is a negative electrode, and the mark 4 is a side surface.
Optionally, the system can also use a testing device, and the testing device can accurately control the charge and discharge current and voltage of the battery and can have a higher sampling frequency, so that data such as the voltage, the current, the time and the like of a damaged battery sample in the testing process are recorded in real time. And determining the internal resistance value of the battery after being damaged by heat radiation according to the voltage and the current, so as to obtain the internal resistance change value before and after being damaged by heat radiation based on the internal resistance value after being damaged by heat radiation and the internal resistance value before being damaged by heat radiation. After the internal resistance change value is obtained, the internal resistance change value can be analyzed to obtain an internal resistance damage consistency result of a damaged battery sample.
In the embodiment, the internal resistance change values of each battery monomer before and after being damaged by heat radiation are tested by adopting a hybrid power pulse characteristic test mode, and the internal resistance damage consistency result of a damaged battery sample can be accurately determined according to the internal resistance change values, so that good data guiding information is provided for the determination of the subsequent final damage consistency result.
And step S203, testing the pressure drop value of each battery monomer before and after being damaged by heat radiation in a pressure drop test mode, and determining the pressure drop damage consistency result of the damaged battery sample according to the pressure drop value.
It should be noted that, the voltage drop uniformity of the damaged battery sample refers to uniformity of voltage drops among different battery cells after the battery voltage drops of each battery cell in the damaged battery sample. It is important to evaluate the overall performance, reliability and safety of damaged battery samples.
Optionally, the voltage drop test method may be a static discharge test method, a dynamic discharge test method, or a cyclic test method, and the method of performing the voltage drop test on the damaged battery sample in this embodiment is not limited.
After the internal resistance change value is obtained, the internal resistance change value can be analyzed to obtain an internal resistance damage consistency result of a damaged battery sample.
And step S204, obtaining a thermal damage consistency result of the damaged battery sample according to the internal resistance damage consistency result and the pressure drop damage consistency result.
It should be noted that, the thermal damage uniformity of the damaged battery sample refers to uniformity of temperature changes among different battery cells after the battery is damaged due to heat radiation. The thermal damage may be caused by external factors or internal factors, which may include degradation of electrode materials, electrolyte decomposition, separator damage, and the like. External factors may include excessive ambient temperature, excessive charging current, mechanical damage to the battery, and the like.
The method comprises the steps of determining a minimum value from an internal resistance damage consistency result and a pressure drop damage consistency result after the internal resistance damage consistency result and the pressure drop damage consistency result are obtained, comparing the minimum value with a preset threshold value, enabling the thermal damage consistency result of a damaged battery sample to be effective when the minimum value is larger than the preset threshold value, and enabling the thermal damage consistency result of the damaged battery sample to be ineffective when the minimum value is not larger than the preset threshold value. The preset threshold may be set in a user-defined manner according to an actual test requirement, for example, may be 90%.
Illustratively, taking the internal resistance damage uniformity result S 1 and the pressure drop damage uniformity result S 2 as examples, the thermal damage uniformity result S of the damaged battery sample can be calculated by the following formula:
S=min(S1,S2);
The method comprises the steps of obtaining a damaged battery sample, wherein the damaged battery sample is obtained after thermal radiation damage treatment, the damaged battery sample comprises a plurality of battery cells, testing internal resistance change values of each battery cell before and after thermal radiation damage by adopting a hybrid power pulse characteristic test method, determining an internal resistance damage consistency result of the damaged battery sample according to the internal group change values, testing pressure drop values of each battery cell before and after thermal radiation damage by adopting a pressure drop test method, determining a pressure drop damage consistency result of the damaged battery sample according to the pressure drop values, and further obtaining a thermal damage consistency result of the damaged battery sample according to the internal resistance damage consistency result and the pressure drop damage consistency result. Compared with the prior art, on one hand, the technical scheme can more comprehensively evaluate the internal resistance change value by adopting a hybrid power pulse characteristic test mode to test the battery monomer, accurately determine the internal resistance damage consistency result based on the internal resistance change value, and rapidly determine the pressure drop value of the battery monomer by adopting a pressure drop test mode, so that the pressure drop damage consistency result is accurately determined, data guidance information is provided for the determination of the subsequent thermal damage consistency result, and on the other hand, the determined thermal damage consistency result accuracy is higher based on the internal resistance damage consistency result and the pressure drop damage consistency result, and good data support is provided for the design and development of the subsequent battery.
In another exemplary embodiment of the present application, in order to accurately determine the internal resistance change value of each battery cell after being damaged by radiation, the internal resistance change value of each battery cell after being damaged by thermal radiation may be tested by adopting a hybrid power pulse characteristic test method, as shown in fig. 5, the above step 202 is replaced by the following steps S301 to S305:
Step S301, at a preset temperature, carrying out standard cycle capacity test on each battery monomer in the damaged battery sample, and determining the battery calibration capacity of each battery monomer.
Specifically, a damaged battery sample was obtained after heat radiation damage was performed on the battery to be treated, and then the damaged battery sample after the test was allowed to stand for 7 days. Referring to table 1, a process step HPPC test is set and performed according to the configuration parameters shown in table 1, capacity calibration is performed on the process step HPPC test, the battery calibration capacity of each battery cell is determined, and then the HPPC test result corresponding to each SOC point of each battery cell is obtained. The configuration parameters may be set according to the charge and discharge characteristics of the battery, and may include a sampling interval, a jump condition, a temperature, a charge cutoff voltage, and a discharge cutoff voltage, where the first preset constant current value and the second preset constant current value, for example, the charge cutoff voltage may be 4.2V, and the discharge cutoff voltage may be 2.7V. The first preset constant value and the second preset constant value are set in a self-defined mode according to actual requirements, the first preset constant value is 0.33C, and the second preset constant value is 1C, wherein 1 C=117A.
TABLE 1
In the process of determining the battery calibration capacity, the first step is executed firstly, the damaged battery sample is kept stand for a period of time at the target temperature, when the step length is more than 1h, the first step is skipped to the second step, the damaged battery sample is discharged at the preset target temperature, the first preset constant current value (0.33C) is used for discharging, when the discharging is carried out to the discharge cut-off voltage (2.7V), namely, the voltage is less than 2.7V, the first step is skipped to the third step, the discharged damaged battery sample is kept stand for the preset time at 25 ℃, then is charged, when the step length is more than 1h, the fourth step is skipped to the fourth step, the first preset constant current value (0.33C) is used for charging the damaged battery sample at 25 ℃, the voltage is more than 4.2V and the constant voltage is skipped to the fifth step when the current is less than 0.05C, the four steps are repeated, and the average discharge capacity after recording is three rounds, namely the battery calibration capacity C 0. The sampling interval of the battery voltage in the four steps is 1.
In step S302, at a plurality of preset SOC points, HPPC step tests are performed on each battery cell according to the battery calibration capacity, so as to obtain HPPC test results corresponding to each battery cell at each SOC point.
Step S303, fitting HPPC test results corresponding to the SOC points of each charge state to obtain a first internal resistance value of each battery cell.
Step S304, a second internal resistance value of each battery cell before being damaged by heat radiation is obtained.
Step S305, obtaining the internal resistance change value of each battery cell according to the first internal resistance value and the second internal resistance value.
In the process of obtaining the HPPC test result corresponding to each SOC point, the method comprises the steps of discharging a damaged battery sample with a first preset constant current value after standing for preset time until the charge quantity of the damaged battery sample reaches a target discharge capacity, discharging the damaged battery sample with a second preset constant current value after standing for the first preset time, charging the damaged battery sample with the second preset constant current value after standing for the first preset time, and recording the HPPC test result corresponding to the damaged battery sample at the preset SOC point.
After determining the battery calibration capacity C 0, the sixth step is performed, wherein the damaged battery sample is kept stand for a period of time, when the step length is larger than 1h, the method jumps to the seventh step, wherein the damaged battery sample is kept stand for a first preset time at a first constant value (0.33C) until the battery is discharged to a target discharge capacity (0.1C 0), when the battery is discharged to the target discharge capacity (0.1C 0), the method jumps to the eighth step, wherein when the step length is larger than 1h, the damaged battery sample is kept stand for a first preset time, when the step length is larger than 10s, the method jumps to the ninth step, wherein the damaged battery sample is subjected to a short discharge pulse, namely, the damaged battery sample is kept stand for a first preset time at a second preset constant value (1C), when the step length is larger than 10s, the damaged battery sample is charged at a second preset constant value (1C), and when the step length is larger than 10s, the damaged battery sample is kept stand for a first preset time, and when the step length is larger than 1 s, the method jumps to the thirteenth step length is repeated for a third step length of time, and the method repeats from the thirteenth step length to 12 h. Wherein, in the sixth step-9 step, the sampling interval is 1, and in the 9 th step-12 step, the sampling interval is 0.1. In the sixth to twelfth steps, the above is performed at the target temperature.
This pulse sequence is repeated at different SOCs, such as every 10% SOCs, from 100% SOCs up to 0% SOCs. HPPC test results were then recorded at the SOC points of charge, 90% SOC, 80% SOC, 70% SOC, 60% SOC,. The HPPC test result may be that the test device collects voltage and current data of the battery according to the sampling interval, then performs fitting processing on the voltage and current data, and calculates a first internal resistance value of each battery cell according to the voltage and the current. The first internal resistance value is the internal resistance value of the battery cell after being damaged by heat radiation, and the second internal resistance value is the internal resistance value of the battery cell before being damaged by heat radiation.
And after obtaining the second internal resistance value of each battery cell before being damaged by heat radiation, performing difference processing on the first internal resistance value and the second internal resistance value to obtain the internal resistance change value of each battery cell.
According to the embodiment, through performing HPPC process step test on the brother battery monomers in the damaged battery sample, the HPPC test result corresponding to each battery monomer at each SOC point can be accurately obtained, the HPPC test result corresponding to each SOC point is fitted to obtain the first internal resistance value of each battery monomer, then the second internal resistance value of each battery monomer before being damaged by heat radiation is obtained, and the accuracy of the determined internal resistance change value of each battery monomer is higher according to the first internal resistance value and the second internal resistance value.
In another exemplary embodiment of the present application, a specific implementation manner of testing the voltage drop value of each battery cell before and after being damaged by thermal radiation by adopting a voltage drop test manner is further provided, as shown in fig. 6, the method may include the following steps S401 to S403:
and S401, after each battery cell is kept stand for a second preset time, testing each battery cell by adopting a voltage drop test mode, and obtaining a first voltage value of each battery cell.
Step S402, a second voltage value of each battery cell before being damaged by heat radiation is obtained.
Step S403, obtaining the voltage drop value of each battery cell according to the first voltage value and the second voltage value.
It should be noted that, the first voltage value is a voltage value of the damaged battery sample after being damaged by thermal radiation, the second voltage value is a voltage value of the damaged battery sample before being damaged by thermal radiation, and the second preset time may be set in a user-defined manner according to an actual requirement, for example, may be 7 days.
Specifically, after a damaged battery sample is obtained, the damaged battery sample can be placed for 7 days, then each battery cell is tested in a voltage drop test mode to obtain a first voltage value of each battery cell, a second voltage value of each battery cell is obtained, and the first voltage value and the second voltage value are subjected to difference treatment to obtain the voltage drop value of each battery cell.
After the voltage drop value of each battery cell is obtained, determining a voltage drop average value according to the voltage drop value of each battery cell, determining voltage deviation of each battery cell before and after the damage of the heated radiation based on the voltage drop value and the voltage drop average value of each battery cell, determining a target voltage deviation with the largest value from the voltage deviation, and determining a voltage drop damage consistency result of a damaged battery sample according to the target voltage deviation.
For example, referring to table 2 below, ten battery cells of the same size and attribute are selected as test samples, respectively 1#, 2#, 3#, 4#, 5#, 6#, 7#, 8#, 9#, 10#, and two battery cells of the same size and attribute are selected as reference samples, respectively d1# and d2#, the two reference samples are not subjected to a thermal radiation damage operation, the ten test samples are baked in an oil cell in a thermal radiation device for 180 seconds, and then both the test samples and the reference samples are left for 7 days. Referring to fig. 7, the internal resistance change values of each battery cell before and after being damaged by heat radiation were tested by using a hybrid power pulse characteristic test method. The internal resistance values of each comparison sample and each test sample after being damaged by heat radiation are obtained, the internal resistance values corresponding to the two comparison samples are 5.1mΩ, the internal resistance values corresponding to the 1# 9# in the test samples are 7.1mΩ, the internal resistance value corresponding to the 10# is 7.2mΩ, and therefore the internal resistance increase values of the test samples after being damaged by heat radiation are obtained, the internal resistance increase values corresponding to the 1# 9# are 2.1, and the internal resistance increase value corresponding to the 10# is 2.2. Then determining an internal resistance average increase value according to the internal resistance increase value of each battery cell, further calculating the deviation of each battery cell according to the internal resistance increase value and the internal resistance average increase value of each battery cell, selecting the largest deviation value as a target internal resistance deviation, wherein the target internal resistance deviation delta 1=2%, and obtaining an internal resistance damage consistency result S 1 =1-delta 1=1-2% =98% of a damaged battery sample.
And testing the voltage drop value of each battery monomer before and after the battery monomer is damaged by heat radiation by adopting a voltage drop test mode after the test sample is placed for 7 days, so that the voltage drop value corresponding to the No. 1 and No. 9 is 55.2mV, and the voltage drop value corresponding to the No. 10 is 55.3mV. And determining a voltage drop average value according to the voltage drop values of the battery cells, further calculating the deviation of each battery cell according to the voltage drop values and the internal resistance voltage drop average value of each battery cell, selecting the largest deviation value as a target voltage deviation, wherein the target voltage deviation delta 2=3%, and obtaining a voltage drop damage consistency result S 2 =1-delta 2=1-3% =97% of a damaged battery sample.
After obtaining the internal resistance damage uniformity result S 1 and the pressure drop damage uniformity result S 2, the thermal damage uniformity result s=min (S 1,S2) =97% of the damaged battery sample was determined. And comparing the thermal damage consistency result S with a preset threshold value of 90%, wherein the thermal damage consistency result of the damaged battery sample is effective due to 97% -90%.
According to the embodiment of the application, on one hand, the battery monomer is tested by adopting a hybrid power pulse characteristic test mode, so that the internal resistance change value can be more comprehensively evaluated, the internal resistance damage consistency result is accurately determined based on the internal resistance change value, and the voltage drop value of the battery monomer is rapidly determined by adopting a voltage drop test mode, so that the voltage drop damage consistency result is accurately determined, data guidance information is provided for the determination of the subsequent thermal damage consistency result, and on the other hand, the determined thermal damage consistency result is higher in accuracy based on the internal resistance damage consistency result and the voltage drop damage consistency result, and good data support is provided for the design and development of the subsequent battery.
Based on the same inventive concept, the embodiment of the application also provides a battery thermal damage consistency testing device for realizing the battery thermal damage consistency testing method. The implementation of the solution provided by the device is similar to that described in the above method, so the specific limitation in the embodiments of the device for testing thermal damage consistency of battery provided below may be referred to the limitation of the method for testing thermal damage consistency of battery hereinabove, and will not be repeated herein.
In one exemplary embodiment, as shown in fig. 8, there is provided a battery thermal damage consistency test apparatus including:
The obtaining module 710 is configured to obtain a damaged battery sample, where the damaged battery sample with a second voltage value is obtained after thermal radiation damage treatment, and the damaged battery sample with a second voltage value includes a plurality of battery monomers;
The first determining module 720 is configured to test internal resistance change values of each battery cell of the second voltage value before and after the battery cell is damaged by thermal radiation by adopting a hybrid power pulse characteristic test manner, and determine an internal resistance damage consistency result of a battery sample damaged by the second voltage value according to the internal resistance change values of the second voltage value;
The second determining module 730 is configured to test the voltage drop value of each battery cell of the second voltage value before and after being damaged by thermal radiation in a voltage drop test manner, and determine a voltage drop damage consistency result of a battery sample damaged by the second voltage value according to the voltage drop value of the second voltage value;
The result determining module 740 is configured to obtain a thermal damage consistency result of the second voltage value damaged battery sample according to the second voltage value internal resistance damage consistency result and the second voltage value voltage drop damage consistency result.
As an alternative embodiment, the first determining module 720 is specifically configured to:
At a preset temperature, carrying out standard cycle capacity test on each battery cell in the second voltage value damaged battery sample, and determining the battery calibration capacity of each battery cell of the second voltage value;
Performing HPPC process step tests on each battery cell of the second voltage value at a plurality of preset SOC points according to the battery calibration capacity to obtain HPPC test results corresponding to each battery cell of the second voltage value at each SOC point;
Fitting HPPC test results corresponding to each SOC point of the second voltage value to obtain a first internal resistance value of each battery cell of the second voltage value;
acquiring a second internal resistance value of each battery cell before being damaged by heat radiation;
And obtaining the internal resistance change value of each battery cell of the second voltage value according to the first internal resistance value of the second voltage value and the second internal resistance value of the second voltage value.
As an alternative embodiment, the first determining module 720 is further configured to:
Discharging the second voltage value damaged battery sample with a first preset constant current value after standing for preset time at each preset SOC point until the charge quantity of the second voltage value damaged battery sample reaches a target discharge capacity, wherein the target discharge capacity of the second voltage value is smaller than the calibrated capacity of the second voltage value battery;
Discharging the second voltage value damaged battery sample by a second preset constant current value after standing for the first preset time, wherein the second preset constant current value is larger than the first preset constant current value of the second voltage value;
and after standing for the first preset time, charging the second voltage value damaged battery sample by using a second preset constant current value of the second voltage value, and recording an HPPC test result corresponding to the second voltage value damaged battery sample at a state of charge (SOC) point preset by the second voltage value.
As an alternative embodiment, the first determining module 720 is further configured to:
Determining an internal resistance change average value according to the battery change values of the battery monomers of the second voltage value;
Determining the internal resistance deviation of each battery cell of the second voltage value before and after the damage of the heated radiation based on the battery variation value of each battery cell of the second voltage value and the internal resistance variation average value of the second voltage value;
Determining a target internal resistance deviation with the maximum value from the second voltage value internal resistance deviation;
and determining an internal resistance damage consistency result of the second voltage value damage battery sample according to the target internal resistance deviation of the second voltage value.
As an alternative embodiment, the second determining module 730 is specifically configured to:
After each battery cell of the second voltage value is kept stand for a second preset time, testing each battery cell of the second voltage value by adopting a voltage drop test mode to obtain a first voltage value of each battery cell of the second voltage value;
acquiring a second voltage value of each battery cell before being damaged by heat radiation;
And obtaining the voltage drop value of each battery cell of the second voltage value according to the first voltage value of the second voltage value and the second voltage value of the second voltage value.
As an alternative embodiment, the second determining module 730 is further configured to:
determining a voltage drop average value according to the voltage drop value of each battery cell of the second voltage value;
Determining voltage deviation of each battery cell of the second voltage value before and after the battery cell is damaged by the heated radiation based on the voltage drop value of each battery cell of the second voltage value and the average value of the voltage drops of the second voltage value;
Determining a target voltage deviation with the largest value from the second voltage value voltage deviations;
and determining a voltage drop damage consistency result of the second voltage value damage battery sample according to the target voltage deviation of the second voltage value.
As an alternative embodiment, the result determining module 740 is specifically configured to:
Determining a minimum value from the second voltage value internal resistance damage consistency result and the second voltage value voltage drop damage consistency result;
Comparing the minimum value of the second voltage value with a preset threshold value;
When the minimum value of the second voltage value is larger than the preset threshold value of the second voltage value, the heat damage consistency result of the second voltage value damaged battery sample is effective.
According to the embodiment, on one hand, the battery monomer is tested by adopting a hybrid power pulse characteristic test mode, the internal resistance change value can be estimated more comprehensively, the internal resistance damage consistency result is accurately determined based on the internal resistance change value, and the pressure drop value of the battery monomer is rapidly determined by adopting a pressure drop test mode, so that the pressure drop damage consistency result is accurately determined, data guiding information is provided for the determination of the subsequent thermal damage consistency result, and on the other hand, the determined thermal damage consistency result is higher in accuracy based on the internal resistance damage consistency result and the pressure drop damage consistency result, and good data support is provided for the design and development of the subsequent battery.
In an exemplary embodiment, a computer device, which may be a server or a terminal, is provided, and an internal structure thereof may be as shown in fig. 9. The computer device includes a processor, a memory, an Input/Output interface (I/O) and a communication interface. The processor, the memory and the input/output interface are connected through a system bus, and the communication interface is connected to the system bus through the input/output interface. Wherein the processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, computer programs, and a database. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage media. The database of the computer device is for storing video tag processing data. The input/output interface of the computer device is used to exchange information between the processor and the external device. The communication interface of the computer device is used for communicating with an external terminal through a network connection. The computer program when executed by a processor implements a method for testing consistency of thermal damage to a battery.
It will be appreciated by persons skilled in the art that the architecture shown in fig. 9 is merely a block diagram of some of the architecture relevant to the present inventive arrangements and is not limiting as to the computer device to which the present inventive arrangements are applicable, and that a particular computer device may include more or fewer components than shown, or may combine some of the components, or have a different arrangement of components.
In an exemplary embodiment, a computer device is also provided, comprising a memory and a processor, the memory having stored therein a computer program, the processor implementing the steps of the method embodiments described above when the computer program is executed.
In an exemplary embodiment, a computer-readable storage medium is provided, in which a computer program is stored which, when being executed by a processor, carries out the steps of the method embodiments described above.
In an exemplary embodiment, a computer program product is provided, comprising a computer program which, when executed by a processor, implements the steps of the method embodiments described above.
It should be noted that, the user information (including but not limited to user equipment information, user personal information, etc.) and the data (including but not limited to data for analysis, stored data, presented data, etc.) related to the present application are both information and data authorized by the user or sufficiently authorized by each party, and the collection, use and processing of the related data are required to meet the related regulations.
Those skilled in the art will appreciate that implementing all or part of the above described methods may be accomplished by way of a computer program stored on a non-transitory computer readable storage medium, which when executed, may comprise the steps of the embodiments of the methods described above. Any reference to memory, database, or other medium used in embodiments provided herein may include at least one of non-volatile and volatile memory. The nonvolatile Memory may include Read-only Memory (ROM), magnetic tape, floppy disk, flash Memory, optical Memory, high density embedded nonvolatile Memory, resistive random access Memory (ReRAM), magneto-resistive random access Memory (Magnetoresistive Random Access Memory, MRAM), ferroelectric Memory (Ferroelectric Random Access Memory, FRAM), phase change Memory (PHASE CHANGE Memory, PCM), graphene Memory, and the like. Volatile memory can include random access memory (Random Access Memory, RAM) or external cache memory, and the like. By way of illustration, and not limitation, RAM can be in various forms such as static random access memory (Static Random Access Memory, SRAM) or dynamic random access memory (Dynamic RandomAccess Memory, DRAM), etc.
The databases referred to in the embodiments provided herein may include at least one of a relational database and a non-relational database. The non-relational database may include, but is not limited to, a blockchain-based distributed database, and the like. The processor referred to in the embodiments provided in the present application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic unit, a data processing logic unit based on quantum computing, or the like, but is not limited thereto.
The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The principles and embodiments of the present application have been described herein with reference to specific examples, which are intended to facilitate an understanding of the principles and concepts of the application and are to be varied in scope and detail by persons of ordinary skill in the art based on the teachings herein. In view of the foregoing, this description should not be construed as limiting the application.
Claims (10)
1. The battery thermal damage consistency test method is characterized by comprising the following steps of:
Obtaining a damaged battery sample, wherein the damaged battery sample is obtained after thermal radiation damage treatment, and comprises a plurality of battery monomers;
Testing the internal resistance change values of each battery monomer before and after the battery monomer is damaged by heat radiation by adopting a mixed power pulse characteristic test mode, and determining an internal resistance damage consistency result of the damaged battery sample according to the internal resistance change values;
Adopting a pressure drop test mode to test the pressure drop value of each battery monomer before and after being damaged by heat radiation, and determining a pressure drop damage consistency result of the damaged battery sample according to the pressure drop value;
And obtaining a thermal damage consistency result of the damaged battery sample according to the internal resistance damage consistency result and the pressure drop damage consistency result.
2. The method for testing the consistency of thermal damage of the battery according to claim 1, wherein the testing the internal resistance change value of each battery cell after being damaged by thermal radiation by adopting a hybrid power pulse characteristic testing mode comprises the following steps:
At a preset temperature, carrying out standard cycle capacity test on each battery monomer in the damaged battery sample, and determining the battery calibration capacity of each battery monomer;
Performing HPPC step tests on each battery cell according to the battery calibration capacity at a plurality of preset SOC points to obtain HPPC test results corresponding to each battery cell at each SOC point;
fitting the HPPC test results corresponding to the SOC points of each charge state to obtain a first internal resistance value of each battery cell;
Acquiring a second internal resistance value of each battery monomer before being damaged by heat radiation;
and obtaining the internal resistance change value of each battery cell according to the first internal resistance value and the second internal resistance value.
3. The method for testing the consistency of thermal damage of a battery according to claim 2, wherein the step of performing HPPC step tests on the battery cells to obtain HPPC test results corresponding to each SOC point of the damaged battery sample includes:
discharging the damaged battery sample at a first preset constant current value after standing for preset time at each preset SOC point until the charge quantity of the damaged battery sample reaches a target discharge capacity, wherein the target discharge capacity is smaller than the battery calibration capacity;
discharging the damaged battery sample by a second preset constant value after standing for a first preset time, wherein the second preset constant value is larger than the first preset constant value;
and after standing for a first preset time, charging the damaged battery sample with the second preset constant current value, and recording an HPPC test result corresponding to the damaged battery sample at the preset SOC point.
4. The method of claim 1, wherein determining an internal resistance damage consistency result for the damaged battery sample based on the internal resistance change value comprises:
Determining an internal resistance change average value according to the battery change values of the battery monomers;
Determining the internal resistance deviation of each battery monomer before and after the damage of the heated radiation based on the battery variation value and the internal resistance variation average value of each battery monomer;
determining a target internal resistance deviation with the maximum value from the internal resistance deviations;
and determining an internal resistance damage consistency result of the damaged battery sample according to the target internal resistance deviation.
5. The method for testing the uniformity of thermal damage of a battery according to claim 1, wherein the testing the voltage drop value of each battery cell before and after the battery cell is damaged by thermal radiation by using a voltage drop test method comprises:
After each battery cell is kept stand for a second preset time, testing each battery cell by adopting a voltage drop test mode to obtain a first voltage value of each battery cell;
acquiring a second voltage value of each battery cell before being damaged by heat radiation;
And obtaining the voltage drop value of each battery cell according to the first voltage value and the second voltage value.
6. The method of claim 1, wherein determining a pressure drop damage consistency result for the damaged battery sample based on the pressure drop value comprises:
determining a pressure drop average value according to the pressure drop values of the battery monomers;
determining voltage deviation of each battery cell before and after the damage of the heated radiation based on the voltage drop value of each battery cell and the voltage drop average value;
Determining a target voltage deviation with the largest value from the voltage deviations;
And determining a voltage drop damage consistency result of the damaged battery sample according to the target voltage deviation.
7. The method of claim 1, wherein obtaining a thermal damage consistency result for the damaged battery sample based on the internal resistance damage consistency result and the pressure drop damage consistency result comprises:
Determining a minimum value from the internal resistance damage consistency result and the pressure drop damage consistency result;
Comparing the minimum value with a preset threshold value;
And when the minimum value is larger than the preset threshold value, the heat damage consistency result of the damaged battery sample is valid.
8. A battery thermal damage consistency test system, comprising:
The device comprises an acquisition module, a detection module and a detection module, wherein the acquisition module is used for acquiring a damaged battery sample, the damaged battery sample is obtained after thermal radiation damage treatment, and the damaged battery sample comprises a plurality of battery monomers;
The first determining module is used for testing the internal resistance change values of each battery monomer before and after the battery monomer is damaged by heat radiation in a mixed power pulse characteristic test mode, and determining an internal resistance damage consistency result of the damaged battery sample according to the internal resistance change values;
The second determining module is used for testing the pressure drop value of each battery monomer before and after the battery monomer is damaged by heat radiation in a pressure drop test mode, and determining a pressure drop damage consistency result of the damaged battery sample according to the pressure drop value;
and the result determining module is used for obtaining the thermal damage consistency result of the damaged battery sample according to the internal resistance damage consistency result and the pressure drop damage consistency result.
9. A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor executes the computer program to implement the battery thermal damage consistency test method of any of claims 1-7.
10. A computer readable storage medium having stored thereon a computer program, characterized in that the computer program, when executed by a processor, implements the battery thermal damage consistency test method of any of claims 1-7.
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