CN110988705B - Method for testing reliability of thermal insulation material of battery module and verification method - Google Patents
Method for testing reliability of thermal insulation material of battery module and verification method Download PDFInfo
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
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- G—PHYSICS
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/396—Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery
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Abstract
The application relates to a method for testing and verifying reliability of a thermal insulation material of a battery module. According to the method for testing the reliability of the heat insulating material of the battery module, each battery monomer in the battery module to be tested is charged to the preset overcharge voltage so as to simulate the gas production process caused by battery aging. Through to after overcharging the battery module that awaits measuring carries out the thermal runaway experiment to compare with the experimental result of the second sample battery module that does not overcharge, can obtain the heat-proof quality of thermal insulation material after the battery module is ageing, quantify the performance of heat insulating material in the battery module, reachs the influence that the ageing gas production extrusion of battery produced the performance of thermal insulation material, and then can test the reliability of full life cycle thermal insulation material. The method has guiding significance for the selection of the heat-insulating material, and can ensure the safety of the battery module to the maximum extent.
Description
Technical Field
The application relates to the field of battery safety testing, in particular to a method for testing and verifying reliability of a battery module heat-insulating material.
Background
To alleviate the problems of energy shortage and environmental pollution, China has already listed the development of new energy automobiles in the strategic emerging technology industry. At present, the key factor restricting the development of electric automobiles is still a lithium ion battery, and the lithium ion battery is a main energy source for realizing the cleanness of the automobiles at present due to the advantages of high specific energy, long cycle life and moderate manufacturing cost.
However, with the large-scale application of lithium ion batteries in the automobile cleaning process, the safety problem of lithium ion batteries also becomes one of the key problems restricting the development and application of lithium ion batteries. Due to some manufacturing defects or improper use, the lithium ion battery can generate a thermal runaway phenomenon in an extreme case. Specifically, the single battery is subjected to accumulation of joule heat and chemical reaction heat in the single battery due to mechanical abuse (extrusion, needling, collision and the like), electrical abuse (overcharge, overdischarge, internal short circuit and the like), thermal abuse and the like, so that the temperature in the battery is increased, and finally, a thermal runaway chain reaction is initiated, so that the battery is ignited and exploded, and meanwhile, the battery can emit more heat in the thermal runaway process. In the case where the heat dissipation condition is not good, the adjacent unit cells are heated by the thermal runaway battery from the normal temperature to the triggering of thermal runaway, and the process of thermal runaway propagation is called "thermal runaway propagation", also called "thermal runaway diffusion", "thermal runaway propagation" or "thermal runaway propagation". Once thermal spread occurs, it means that energy greater than or equal to two single batteries is released into the module, the probability of a secondary fire occurring in the battery system is greatly increased, and it means that the whole module and even the whole automobile are in a dangerous situation at this time. Therefore, the thermal runaway and the spreading accident are easy to cause personal casualties and property loss.
Relevant researches show that at present, no absolutely reliable method is available for avoiding the thermal runaway from generating, and the thermal runaway spread can be inhibited by an effective design method on a system level. One effective means is to add thermal insulation material between the batteries, the thermal insulation material is composed of aerogel, aluminum silicate and other materials with high porosity, and the middle of the material is filled with a large amount of air, so that the material has better non-thermal conductivity. When thermal runaway occurs, the rapid propagation of heat can be blocked, so that the thermal spreading process is slowed down or even inhibited, and the safety significance of the electric automobile is self-evident. However, in the actual experiment process, engineers find that, as the battery module is used, some signs of aging are gradually shown, the aged battery generates a part of gas, so that the volume of the single battery is increased, the battery with the increased volume extrudes the heat insulation material, so that the heat insulation layer is thinner than the preset case, and according to a heat transfer equation, the heat insulation performance of the thinned heat insulation material is poor, and the original thermal runaway suppression capability may be poor due to the change. Therefore, it is necessary to test not only the reliability of the heat insulating material at the time of shipment but also the heat insulating material after it becomes thin due to aging of the battery.
Disclosure of Invention
Based on the above, the application provides a method for testing the reliability of the thermal insulation material of the battery module and a verification method thereof, so as to simulate and test the thermal insulation performance of the thermal insulation material after the battery is aged and thinned.
A method for testing the reliability of a thermal insulation material of a battery module comprises the following steps:
s10, providing a battery module to be tested, and charging the battery module to be tested to a preset overcharge voltage so as to simulate the aged battery module generating gas;
s20, when the over-inflation gas production rate of the battery module to be tested is stable, restoring the battery module to be tested to a preset charge state;
s30, performing a thermal runaway experiment on the battery module to be tested to obtain a curve of temperature change along with time among battery monomers in the battery module to be tested;
and S40, analyzing the heat insulation performance of the battery module to be tested according to the curve of the temperature changing along with the time so as to obtain the reliability of the heat insulation material in the battery module to be tested.
In one embodiment, in step S20, after the overcharge gas production of the battery module to be tested is stabilized, the step of restoring the battery module to be tested to the preset state of charge includes:
and when the overcharge gas yield of the battery module to be tested is stable, circularly charging and discharging the battery module to be tested to a preset capacity so that the battery module to be tested is restored to a preset charge state.
In one embodiment, the step of analyzing the thermal insulation performance of the battery module to be tested according to the time-dependent temperature curve S40 includes:
and acquiring the thermal runaway propagation rate of the battery module to be tested through a curve of the temperature among the battery monomers of the battery module to be tested along with the time change, and judging that the heat insulation performance of the thermal insulation material of the battery module to be tested can not meet the application requirement when the thermal runaway propagation rate of the battery module to be tested is greater than a preset value.
In one embodiment, the step of providing the battery module to be tested and charging the battery module to be tested to the preset overcharge voltage to simulate the aged battery module generating the gas at S10 includes:
obtaining the relation between the overcharging voltage and the volume change of the battery monomer;
and providing a battery module to be tested, and charging each battery monomer in the battery module to be tested to a preset overcharge voltage according to the relation between the overcharge voltage and the volume change of the battery monomer.
In one embodiment, the step of obtaining the relation between the overcharge voltage and the volume change of the battery cell comprises the following steps:
selecting a plurality of battery monomers as a first sample group, and obtaining the volume of each battery monomer in the first sample group;
and charging each battery monomer in the first sample group to a preset overcharge voltage, acquiring the charged volume of each battery monomer, and further acquiring the relation between the overcharge voltage and the volume change of the battery monomer.
In one embodiment, the first sample group and the battery module to be tested have the same battery model.
In one embodiment, the charged volume of each battery cell is obtained by a drainage method.
In one embodiment, the thermal runaway experiment is performed by means of heating triggering or needle punching extrusion.
A verification method for simulating the reliability of an insulation material after a battery module is aged comprises the following steps:
s100, selecting a plurality of battery monomers as a first sample group, obtaining the volume of each battery monomer in the first sample group, charging each battery monomer in the first sample group to a preset overcharging voltage, obtaining the charged volume of each battery monomer, and further obtaining the relationship between the overcharging voltage and the volume change of the battery monomers;
s200, providing a battery module to be tested, and charging each battery monomer in the battery module to be tested to a preset overcharge voltage according to the relation between the overcharge voltage and the volume change of the battery monomer so as to simulate the aged battery module generating gas;
s300, when the over-inflation gas production rate of the battery module to be tested is stable, restoring the battery module to be tested to a preset charge state;
s400, providing a second sample battery module, and respectively performing a thermal runaway experiment on the second sample battery module and the battery module to be tested to obtain comparison experiment data;
and S500, verifying the feasibility of the reliability of the heat-insulating material of the battery module generating the gas after aging according to the comparative experiment data.
In one embodiment, in S400, a second sample battery module is provided, a thermal runaway experiment is performed on the second sample battery module and the battery module to be tested, and the step of obtaining comparison experiment data includes:
and respectively acquiring curves of temperature changes between the battery monomers along with time after the thermal runaway of the second sample battery module and the battery module to be tested.
In one embodiment, the step S500 of verifying the feasibility of simulating the reliability of the heat insulating material of the battery module generating gas after aging according to the comparative experimental data includes:
acquiring the thermal runaway propagation rate of the second sample battery module through the curve of the temperature among the battery monomers of the second sample battery module along with the change of time;
acquiring the thermal runaway propagation rate of the battery module to be tested according to the curve of the temperature among the battery monomers of the battery module to be tested along with the change of time;
and comparing the thermal runaway propagation rate of the second sample battery module with the thermal runaway propagation rate of the battery module to be tested, and further determining the feasibility of simulating the reliability of the thermal insulation material after the battery module is aged.
According to the method for testing the reliability of the heat insulating material of the battery module, each battery monomer in the battery module to be tested is charged to the preset overcharge voltage so as to simulate the gas production process caused by battery aging. Through to after overcharging the battery module that awaits measuring carries out the thermal runaway experiment to compare with the experimental result of the second sample battery module that does not overcharge, can obtain the heat-proof quality of thermal insulation material after the battery module is ageing, quantify the performance of heat insulating material in the battery module, reachs the influence that the ageing gas production extrusion of battery produced the performance of thermal insulation material, and then can test the reliability of full life cycle thermal insulation material. The method has guiding significance for the selection of the heat-insulating material, and can ensure the safety of the battery module to the maximum extent.
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FIG. 1 is a flow chart of a method for testing reliability of a thermal insulation material of a battery module according to an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of a battery module to be tested according to an embodiment of the present application;
fig. 3 is a schematic diagram of various degrees of micro-overcharge of battery cells provided in an embodiment of the present application;
fig. 4 is a schematic diagram of a battery module to be tested after micro overcharge provided in an embodiment of the present application;
fig. 5 is a schematic diagram of an overcharge experiment of a battery module to be tested according to an embodiment of the present application;
fig. 6 is a flowchart illustrating a method for verifying the reliability of an insulation material after aging of a battery module according to an embodiment of the present disclosure;
FIG. 7 is a graph of temperature versus time for a prior battery module thermal creep experiment as provided in one embodiment of the present application;
fig. 8 is a graph of temperature versus time for a thermal spread experiment of an overcharged 4.4V battery module provided in one embodiment of the present application;
fig. 9 is a graph of temperature versus time for a thermal spread experiment of an overcharged 4.6V battery module provided in one embodiment of the present application.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present application more comprehensible, embodiments accompanying the present application are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. This application is capable of embodiments in many different forms than those described herein and those skilled in the art will be able to make similar modifications without departing from the spirit of the application and it is therefore not intended to be limited to the embodiments disclosed below.
It is to be noted that, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
In recent years, the safety of lithium batteries is a hot spot of great concern, the safety problem of lithium batteries generally refers to the thermal runaway and thermal spreading problem of lithium batteries, and the thermal runaway problem of lithium batteries is difficult to solve and is more promising for solving the thermal spreading problem of lithium batteries. Researchers have developed thermal insulation materials of varying formulations and thicknesses in an attempt to slow the spread of thermal runaway between cells. However, in the actual use process, the properties of the heat insulating material may change with the use process, for example, the heat insulating material is extruded due to the gas generated by the aging of the battery, so that the thickness of the heat insulating material is reduced. In order to investigate whether the properties of the changed heat insulating material can meet the requirements, the aged battery needs to be tested. However, the aging test of the battery module requires a lot of time and money.
In view of the above problems, one embodiment of the present application provides a method for testing reliability of a thermal insulation material of a battery module. Referring to fig. 1, the testing method includes:
and S10, providing a battery module to be tested, and charging the battery module to be tested to a preset overcharge voltage so as to simulate the aged battery module generating gas. In step S10, the battery module to be tested includes a plurality of battery cells. And a heat insulating material with a certain thickness is arranged between the adjacent battery cells. Generally, when the battery module is produced, a certain pretightening force is generated in the battery module, so that the battery module to be tested can also have a certain pretightening force. The structure of the battery module to be tested is shown in fig. 2.
And S20, when the over-inflation gas production rate of the battery module to be tested is stable, restoring the battery module to be tested to a preset charge state. In step S20, the battery after overcharging may have more energy than the normal battery, and in order to eliminate the influence of this energy on the experimental result, normal capacity cycling may be performed after the battery is stabilized, and the battery is restored to the SOC level to be measured. I.e. the cell is restored to normal energy levels, but the cell volume expansion is irreversible.
And S30, performing a thermal runaway experiment on the battery module to be tested to obtain a curve of temperature change along with time among the battery monomers in the battery module to be tested. In step S30, in an alternative embodiment, the thermal runaway experiment is performed by using a thermal trigger or a needle stick.
And S40, analyzing the heat insulation performance of the battery module to be tested according to the curve of the temperature changing along with the time so as to obtain the reliability of the heat insulation material in the battery module to be tested. In step S40, the thermal runaway propagation rate of the battery module to be tested may be obtained through a curve of the temperature between the battery cells of the battery module to be tested changing with time. And reflecting the time required by heat spreading according to the thermal runaway propagation rate, and judging that the heat insulation performance of the thermal insulation material of the battery module to be tested can not meet the application requirement when the thermal runaway propagation rate of the battery module to be tested is greater than a preset value. Namely, the battery module to be tested aged to the degree is not suitable for continuous use, and a new battery module needs to be replaced in time.
In this embodiment, each battery cell in the battery module to be tested is charged to a preset overcharge voltage to simulate a gas generation process caused by battery aging. Through carrying out thermal runaway experiment on the overcharged battery module to be tested, the heat insulation performance of the heat insulation material after the battery module is aged can be obtained, the performance of the heat insulation material in the battery module is quantized, the influence of the aged gas production extrusion of the battery on the performance of the heat insulation material is obtained, and the reliability of the heat insulation material in the whole life cycle can be tested. The method has guiding significance for the selection of the heat-insulating material, and can ensure the safety of the battery module to the maximum extent.
In one embodiment, the step of providing the battery module to be tested and charging the battery module to be tested to the preset overcharge voltage to simulate the aged battery module generating the gas at S10 includes:
and obtaining the relation between the overcharging voltage and the volume change of the battery monomer. And providing a battery module to be tested, and charging each battery monomer in the battery module to be tested to a preset overcharge voltage according to the relation between the overcharge voltage and the volume change of the battery monomer.
In an alternative embodiment, the step of obtaining the relation between the overcharge voltage and the volume change of the battery cells may be selecting a plurality of battery cells as the first sample group. In an optional embodiment, the first sample group and the battery module to be tested have the same battery model. Obtaining a volume of each battery cell in the first sample set. And charging each battery monomer in the first sample group to a preset overcharge voltage, acquiring the charged volume of each battery monomer, and further acquiring the relation between the overcharge voltage and the volume change of the battery monomer. In an alternative embodiment, the charged volume of each battery cell is obtained by a liquid discharge method. Liquids selected for drainage methods generally do not take into account water, as there may be a risk of short circuits. For example, the first sample set may be overcharged to 4.3V, 4.4V, 4.5V, 4.6V, 4.7V, 4.8V, 4.9V, 5.0V, respectively, at a smaller rate, 1/5C is more suitable for the smaller rate, because the gas generation characteristics of the battery are more stable and uniform. The volume change of the first sample group after being overcharged to different preset voltages is shown in fig. 3. The overcharge characteristics of different types of batteries are different, so that not all batteries can be charged to 5.0V, the maximum overcharge voltage can be selected according to the characteristics of the batteries, and the process can embody different battery gas production degrees. And after the battery is stable and the safety is confirmed after overcharging, the volume of the battery is measured respectively.
And selecting a proper micro-overcharge voltage U1(U2, U3 …) according to the relation between the overcharge voltage and the volume change of the battery cells. And selecting a micro overcharge voltage as the overcharge voltage of the whole module to be tested in one test, namely representing that all monomers in the module to be tested have the same volume expansion. And selecting a second voltage to be tested to represent the overcharging voltage of the whole module to be tested in the second test, and also to represent that all the battery monomers in the module to be tested have the same volume expansion, but the expansion degree is different from that in the first test because the selected overcharging voltage is also different. Fig. 4 is a schematic diagram showing the volume change of the battery module to be tested after the micro overcharge. Fig. 5 is a schematic diagram of an overcharge experiment of a battery module to be tested, and as can be seen from fig. 5, each battery cell is overcharged through an overcharge cable. According to the relation between the overcharging voltage and the volume change of the single battery, the purposes of controlling the deformation of the single battery in the battery module to be tested and the extrusion degree of the heat insulation material can be achieved.
Referring to fig. 6, an embodiment of the present application provides a method for verifying reliability of a thermal insulation material of a battery module, where the method includes:
s100, selecting a plurality of single batteries as a first sample group, obtaining the volume of each single battery in the first sample group, charging each single battery in the first sample group to a preset overcharge voltage, obtaining the charged volume of each single battery, and further obtaining the relationship between the overcharge voltage and the volume change of the single battery.
S200, providing a battery module to be tested, and charging each battery monomer in the battery module to be tested to a preset overcharge voltage according to the relation between the overcharge voltage and the volume change of the battery monomer so as to simulate the aged battery module generating gas.
S300, when the over-inflation gas production amount of the battery module to be tested is stable, restoring the battery module to be tested to a preset charge state.
And S400, providing a second sample battery module, and performing thermal runaway experiments on the second sample battery module and the battery module to be tested respectively to obtain comparison experiment data.
And S500, verifying the feasibility of the reliability of the heat-insulating material of the battery module generating the gas after aging according to the comparative experiment data.
The steps S100 to S300 included in the above embodiments are not described herein again. In step S400, a second sample battery module is provided, and a thermal runaway experiment is performed on the second sample battery module and the battery module to be tested, respectively, and the step of obtaining comparative experiment data may be to obtain a curve of temperature change between battery cells with time after thermal runaway of the second sample battery module and the battery module to be tested, respectively. The second sample battery module is the same as the battery module to be tested in battery model number. The second sample battery module is a battery pack which is not overcharged. In order to obtain the curve of the temperature change between the battery cells along with the time, the temperature between the battery cells can be recorded in real time.
In step S500, according to the comparative experimental data, the step of verifying the feasibility of the reliability of the heat insulating material of the aged gas-generating battery module may be to obtain the thermal runaway propagation rate of the second sample battery module according to a curve of the temperature between the battery cells of the second sample battery module changing with time. And acquiring the thermal runaway propagation rate of the battery module to be tested through the curve of the temperature between the battery monomers of the battery module to be tested along with the change of time. And comparing the thermal runaway propagation rate of the second sample battery module with the thermal runaway propagation rate of the battery module to be tested, and further determining the feasibility of simulating the reliability of the thermal insulation material after the battery module is aged. And when the thermal runaway propagation rate of the second sample battery module is obviously greater than that of the battery module to be tested, the gas production process caused by aging of the battery module can be simulated through overcharging. Furthermore, the thermal runaway experiment can be carried out on the overcharged battery module to be tested, the thermal insulation performance of the thermal insulation material after the battery module is aged can be obtained, the performance of the thermal insulation material in the battery module is quantified, the influence of the aged gas production extrusion of the battery on the performance of the thermal insulation material is obtained, and the reliability of the thermal insulation material in the whole life cycle can be tested.
Fig. 7 is a graph of temperature versus time for a thermal creep experiment of a non-rechargeable battery module as provided in one embodiment of the present application. Fig. 8 is a graph of temperature versus time for a thermal spread experiment of an overcharged 4.4V battery module provided in one embodiment of the present application. Fig. 9 is a graph of temperature versus time for a thermal spread experiment of an overcharged 4.6V battery module provided in one embodiment of the present application. As can be seen from fig. 7-9, the thermal insulation material of the battery module under test after overcharge has poor thermal insulation properties. And in addition, in the heat spreading experiment of the second sample battery module which is not overcharged, the triggering time of the single battery is long, and the spreading time is long. After overcharging the battery module that awaits measuring, along with the improvement of overcharging voltage, thermal extension trigger time shortens, and the time of stretching becomes fast. It can be seen that, as the battery cell expands, the degree of extrusion of the heat insulating material is greater and greater, which leads to the decrease of heat insulating performance, the advance of the thermal spreading trigger time, and the acceleration of the thermal runaway spreading time. Therefore, the method can well simulate the condition that the heat insulation performance is reduced due to the fact that the heat insulation material is extruded by the generated gas when the battery module is aged normally.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the claims. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A method for testing reliability of a thermal insulation material of a battery module is characterized by comprising the following steps:
s10, providing a battery module to be tested, and charging the battery module to be tested to a preset overcharge voltage so as to simulate the aged battery module generating gas;
s20, when the over-inflation gas production rate of the battery module to be tested is stable, restoring the battery module to be tested to a preset charge state;
s30, performing a thermal runaway experiment on the battery module to be tested to obtain a curve of temperature change along with time among battery monomers in the battery module to be tested;
s40, analyzing the heat insulation performance of the battery module to be tested according to the curve of the temperature changing along with the time;
s10, providing a battery module to be tested, charging the battery module to be tested to a preset overcharge voltage, and simulating the aged battery module generating gas, wherein the steps of the battery module to be tested comprise:
obtaining the relation between the overcharging voltage and the volume change of the battery monomer;
and providing a battery module to be tested, and charging each battery monomer in the battery module to be tested to a preset overcharge voltage according to the relation between the overcharge voltage and the volume change of the battery monomer.
2. The testing method according to claim 1, wherein the step of S20, after the over-inflation gas production rate of the battery module under test is stabilized, restoring the battery module under test to a preset state of charge comprises:
and when the overcharge gas yield of the battery module to be tested is stable, circularly charging and discharging the battery module to be tested to a preset capacity so that the battery module to be tested is restored to a preset charge state.
3. The method as claimed in claim 2, wherein the step of analyzing the thermal insulation performance of the battery module to be tested according to the time-dependent temperature profile at S40 comprises:
and acquiring the thermal runaway propagation rate of the battery module to be tested through a curve of the temperature among the battery monomers of the battery module to be tested along with the time change, and judging that the heat insulation performance of the thermal insulation material of the battery module to be tested can not meet the application requirement when the thermal runaway propagation rate of the battery module to be tested is greater than a preset value.
4. The test method of claim 1, wherein the step of obtaining the relationship between the overcharge voltage and the cell volume change comprises:
selecting a plurality of battery monomers as a first sample group, and obtaining the volume of each battery monomer in the first sample group;
and charging each battery monomer in the first sample group to a preset overcharge voltage, acquiring the charged volume of each battery monomer, and further acquiring the relation between the overcharge voltage and the volume change of the battery monomer.
5. The testing method of claim 4, wherein the first sample group and the battery module to be tested have the same battery model.
6. The method according to claim 5, wherein the charged volume of each of the battery cells is obtained by a drain method.
7. The test method according to claim 1, wherein the thermal runaway experiment is performed by means of a thermal trigger or a needle punch.
8. A verification method for reliability test of a battery module heat insulation material is characterized by comprising the following steps:
s100, selecting a plurality of battery monomers as a first sample group, obtaining the volume of each battery monomer in the first sample group, charging each battery monomer in the first sample group to a preset overcharging voltage, obtaining the charged volume of each battery monomer, and further obtaining the relationship between the overcharging voltage and the volume change of the battery monomers;
s200, providing a battery module to be tested, and charging each battery monomer in the battery module to be tested to a preset overcharge voltage according to the relation between the overcharge voltage and the volume change of the battery monomer so as to simulate the aged battery module generating gas;
s300, when the over-inflation gas production rate of the battery module to be tested is stable, restoring the battery module to be tested to a preset charge state;
s400, providing a second sample battery module, and respectively performing a thermal runaway experiment on the second sample battery module and the battery module to be tested to obtain comparison experiment data;
and S500, verifying the feasibility of simulating the reliability of the heat-insulating material of the battery module generating the gas after aging according to the comparative experiment data.
9. The verification method according to claim 8, wherein the step S400 of providing a second sample battery module, performing a thermal runaway experiment on the second sample battery module and the battery module to be tested, and acquiring comparison experiment data includes:
and respectively acquiring curves of temperature changes between the battery monomers along with time after the thermal runaway of the second sample battery module and the battery module to be tested.
10. The verification method according to claim 9, wherein the step of verifying the feasibility of simulating the reliability of the heat insulating material of the battery module generating gas after aging according to the comparative experimental data in step S500 comprises:
acquiring the thermal runaway propagation rate of the second sample battery module through the curve of the temperature among the battery monomers of the second sample battery module along with the change of time;
acquiring the thermal runaway propagation rate of the battery module to be tested according to the curve of the temperature among the battery monomers of the battery module to be tested along with the change of time;
and comparing the thermal runaway propagation rate of the second sample battery module with the thermal runaway propagation rate of the battery module to be tested, and further determining the feasibility of simulating the reliability of the thermal insulation material after the battery module is aged.
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| JP4313011B2 (en) * | 2002-09-17 | 2009-08-12 | 日本碍子株式会社 | Control method of heater for sodium-sulfur battery module |
| KR20150102778A (en) * | 2013-11-13 | 2015-09-08 | 삼성에스디아이 주식회사 | Battery pack, apparatus including battery pack, and method of managing battery pack |
| CN104730464B (en) * | 2013-12-18 | 2019-07-09 | 中国电子科技集团公司第十八研究所 | Method for testing adiabatic temperature rise rate of battery |
| CN106646257B (en) * | 2016-12-22 | 2019-07-02 | 国联汽车动力电池研究院有限责任公司 | A kind of test platform and test method of the diffusion of detection lithium ion battery thermal runaway |
| CN109465209B (en) * | 2018-10-24 | 2020-10-27 | 中通服咨询设计研究院有限公司 | Power battery cascade utilization method based on photovoltaic base station |
| CN109557478B (en) * | 2018-11-07 | 2020-12-15 | 上海恩捷新材料科技有限公司 | Lithium ion battery safety performance evaluation method |
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