CN109063410B - Energy analysis method in thermal runaway process of lithium ion battery - Google Patents
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Abstract
The invention provides an energy analysis method in a thermal runaway process of a lithium ion battery, which comprises the following steps: selecting a lithium ion battery to perform a thermal runaway experiment, collecting residues and measuring a combustion heat value; another lithium ion battery is selected, disassembled, the anode, the cathode, the electrolyte, the diaphragm and the aluminum plastic film are separated, the combustion heat value is measured, and the combustion heat value under the coexistence of the anode and the electrolyte and the combustion heat value under the coexistence of the cathode and the electrolyte are measured through a calorimeter; and calculating the energy released in the thermal runaway process of the lithium ion battery. According to the invention, the combustion heat value before and after the thermal runaway of the lithium ion battery is measured in an indirect mode, the energy released in the thermal runaway process of the lithium ion battery is analyzed in a weighted mode, and accordingly, the external protection measure of the lithium ion battery is carried out, so that the harm caused by the combustion and explosion of the battery is reduced to the minimum, the trend of fire spread is delayed, and the time is strived for personnel escape and fire emergency.
Description
Technical Field
The invention relates to the technical field of lithium ion batteries, in particular to an energy analysis method in a thermal runaway process of a lithium ion battery.
Background
With the vigorous development of the energy storage market of lithium ion batteries, the safety of the lithium ion batteries is becoming more and more concerned. In addition, in recent years, a plurality of safety accidents occur in the power battery for the electric vehicle, and the safety concern of people on energy storage of the lithium ion secondary battery is raised.
On one hand, the lithium ion battery adopts an organic carbonate electrolyte system with a low ignition point, when the battery is in an overcharged state, an organic solvent is easy to generate irreversible oxidative decomposition on the surface of the positive electrode, and a large amount of heat is discharged and simultaneously a large amount of combustible gas is generated, so that the internal temperature and pressure of the battery are rapidly increased, and the explosion and combustion risks are brought to the battery; on the other hand, there are a series of potential exothermic reactions in the lithium ion battery itself, and abuse of the battery during use, particularly, battery overcharge, overdischarge, external and internal short circuits, extrusion, collision, high temperature, etc., may cause reactions of chemical substances in the battery, so that a great amount of heat generated in the battery causes thermal runaway of the battery, and finally, ignition or explosion of the battery. Therefore, the lithium ion battery must be safely protected. Particularly in some extreme cases, when thermal runaway of the battery is unavoidable by internal protection measures, the battery will inevitably undergo combustion explosion.
Disclosure of Invention
In view of the above, the invention provides an energy analysis method in the thermal runaway process of a lithium ion battery, which aims to solve the problem that the fire of the battery is caused by fire or explosion of the battery due to the thermal runaway of the existing lithium ion battery.
The invention provides an energy analysis method in a thermal runaway process of a lithium ion battery, which comprises the following steps: a thermal runaway measurement step, namely selecting a lithium ion battery to carry out a thermal runaway experiment, collecting residues after the thermal runaway of the lithium ion battery, and measuring the combustion heat value of the residues through a calorimeter; a disassembly measurement step, namely selecting another lithium ion battery in the same state as the lithium ion battery selected in the thermal runaway measurement step, disassembling the lithium ion battery, separating the positive electrode, the negative electrode, the electrolyte, the diaphragm and the aluminum-plastic film, measuring the combustion heat values of the positive electrode, the negative electrode, the electrolyte, the diaphragm and the aluminum-plastic film through a calorimeter, and measuring the combustion heat values of the positive electrode and the electrolyte in the coexistence and the combustion heat values of the negative electrode and the electrolyte in the coexistence through the calorimeter; the electrolyte under the coexistence of the positive electrode and the electrolyte is half of the electrolyte for disassembling the lithium ion battery; the electrolyte under the coexistence of the negative electrode and the electrolyte is half of the electrolyte for disassembling the lithium ion battery; and calculating, namely calculating the energy released in the thermal runaway process of the lithium ion battery in a weighted mode according to the combustion heat values measured in the thermal runaway measuring step and the disassembly measuring step.
Further, the method for analyzing energy in the thermal runaway process of the lithium ion battery comprises the following sub-steps: a battery combustion heat calculation sub-step, namely calculating the combustion heat value of the lithium ion battery in a weighted mode according to the combustion heat value measured in the disassembly measurement step; and a capability calculating sub-step of measuring the combustion heat value of lithium ions according to the combustion heat value of the lithium ion battery calculated in the battery combustion heat calculating sub-step and the thermal runaway measuring step and calculating the energy released in the thermal runaway process of the lithium ion battery.
Further, the method for analyzing the energy in the thermal runaway process of the lithium ion battery is characterized in that the battery burns
In the burning heat calculation substep, the calculation formula of the burning heat value Q of the lithium ion battery is as follows:
Q＝mQ (c,e) +nQ (a,e) +oQ (e) +(1-m)Q (c) +(1-n)Q (a) +Q (g) +Q (l) +Q (s)
wherein m, n and o (0.ltoreq.m, n, o.ltoreq.1) are correction coefficients, Q (c,e) Q is the combustion heat value of the cathode and the electrolyte in the coexistence (a,e) Q is the combustion heat value of the cathode and the electrolyte in the coexistence (e) Combustion heat value, Q, of electrolyte solution disassembled for the lithium ion battery (c) Combustion heat value of positive electrode disassembled for lithium ion battery, Q (a) Combustion heat value of negative electrode disassembled for lithium ion battery, Q (g) Combustion heat value, Q, of diaphragm disassembled for the lithium ion battery (l) Combustion heat value Q of aluminum plastic film disassembled for lithium ion battery (s) Is irreversible heat.
Further, in the method for analyzing energy in thermal runaway process of lithium ion battery, in the step of capability calculation, the energy Q released in thermal runaway process of lithium ion battery (r) The calculation formula of (2) is as follows:
Q (r) ＝Q-Q (z)
in the method, in the process of the invention,q is the combustion heat value of the lithium ion battery, Q (z) And the combustion heat value of the residue after the lithium ion battery is in thermal runaway.
Further, in the above-described method for analyzing energy in a thermal runaway process of a lithium ion battery, in the thermal runaway measuring step or the disassembly measuring step, the combustion heat value of each portion is measured by: the substances were equally divided into several parts, and the combustion heat value of the substances was calculated by measuring the combustion heat value of one of them.
Further, in the method for analyzing energy in the thermal runaway process of the lithium ion battery, in the thermal runaway measurement step or the disassembly measurement step, the calorimeter is an oxygen bomb calorimeter.
Further, in the method for analyzing energy in the thermal runaway process of the lithium ion battery, in the thermal runaway measurement step, overcharging, short-circuiting, thermal abuse or needling is adopted to induce the lithium ion battery to generate thermal runaway.
Further, in the above method for analyzing energy in thermal runaway of lithium ion battery, in the step of disassembling and measuring, the disassembled lithium ion battery is in a full state, and the disassembling operation is performed in a glove box.
In the disassembly measurement step, after the lithium ion battery is disassembled, the separated positive electrode, the separated negative electrode, the separated diaphragm, the separated electrolyte and the separated aluminum plastic film are cleaned by adopting dimethyl carbonate.
According to the energy analysis method in the thermal runaway process of the lithium ion battery, the combustion heat values before and after the thermal runaway of the lithium ion battery are measured in an indirect mode, and the energy released in the thermal runaway process of the lithium ion battery is analyzed in a weighted mode, so that external protection measures of the lithium ion battery are taken according to the energy analysis method, damage caused by combustion and explosion of the battery is minimized, the trend of fire spreading is delayed as much as possible, and time is strived for personnel escape and fire emergency.
In particular, the energy Q released in the thermal runaway process of the lithium ion battery is improved by adopting a weighting mode for calculation (r) Calculated asThe accuracy is further improved, and the cognition of energy released in the thermal runaway process of the lithium ion battery is further improved, so that the accuracy of external protective measures of the lithium ion battery is improved, the trend of fire spread is further delayed, and more time is striven for personnel escape and fire emergency.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to designate like parts throughout the figures. In the drawings:
fig. 1 is a schematic flow chart of an energy analysis method in a thermal runaway process of a lithium ion battery according to an embodiment of the present invention;
fig. 2 is a flowchart illustrating a calculation step according to an embodiment of the present invention.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other. The invention will be described in detail below with reference to the drawings in connection with embodiments.
Referring to fig. 1, a schematic flow chart of an energy analysis method in a thermal runaway process of a lithium ion battery according to an embodiment of the invention is shown. As shown, the method comprises the steps of:
and S1, performing thermal runaway measurement, namely selecting a lithium ion battery to perform a thermal runaway experiment, collecting residues after the lithium ion battery is subjected to thermal runaway, and measuring the combustion heat value of the residues by a calorimeter.
Specifically, first, a lithium is selectedAn ion battery. Then, through carrying out a thermal runaway experiment on the lithium ion battery, collecting residues after the thermal runaway of the lithium ion battery; preferably, the lithium ion battery in a full battery state is induced to generate thermal runaway by adopting an overcharging, short-circuit, thermal abuse or needling mode, so that the energy release in the lithium ion battery is sufficient; it is further preferred that thermal abuse mode be employed to induce thermal runaway experiments. Finally, the combustion heat value Q of the residue collected after the thermal runaway of the lithium ion battery is measured by a calorimeter (z) . Preferably, the calorimeter is an oxygen bomb calorimeter.
And a disassembly measurement step S2, namely selecting another lithium ion battery in the same state as the lithium ion battery selected in the thermal runaway measurement step, disassembling the lithium ion battery, separating the positive electrode, the negative electrode, the electrolyte, the diaphragm and the aluminum-plastic film, measuring the combustion heat values of the positive electrode, the negative electrode, the electrolyte, the diaphragm and the aluminum-plastic film through a calorimeter, and measuring the combustion heat values of the positive electrode and the electrolyte in the coexistence and the combustion heat values of the negative electrode and the electrolyte in the coexistence through the calorimeter.
Specifically, firstly, selecting a lithium ion battery in the same state as the lithium ion battery selected in the thermal runaway measuring step; preferably, the lithium ion battery is selected to be in a full state. Then, disassembling the lithium ion battery in a full battery state to obtain a separated positive electrode, a negative electrode, a diaphragm, electrolyte and an aluminum plastic film; preferably, the lithium ion battery can be disassembled in a glove box to prevent the chemical environment of the lithium ion battery from changing so as to influence the test result. Preferably, after the lithium ion battery is disassembled, the separated positive electrode, the separated negative electrode, the separated diaphragm, the separated electrolyte and the separated aluminum plastic film are cleaned by adopting dimethyl carbonate. Finally, measuring the combustion heat values of the anode, the cathode, the diaphragm, the electrolyte and the aluminum plastic film of the lithium ion battery by using a calorimeter, and measuring the combustion heat values of the anode and the electrolyte in the coexistence of the anode and the electrolyte and the combustion heat values of the cathode and the electrolyte in the coexistence of the anode and the electrolyte; the electrolyte under the coexistence of the positive electrode and the electrolyte is half of the electrolyte for disassembling the lithium ion battery, wherein the mass of the positive electrode is the same as that of the positive electrode for disassembling the lithium ion battery; the electrolyte under the coexistence of the cathode and the electrolyte is half of the electrolyte for disassembling the lithium ion battery, wherein the mass of the cathode is equal to that of the electrolyte for disassembling the lithium ion batteryThe quality of the cathodes of (a) is the same; that is, the electrolyte solution disassembled from the lithium ion battery is divided into two parts, and coexists with the positive electrode and the negative electrode disassembled from the lithium ion battery, respectively. Wherein the combustion heat value of each part is the combustion heat value Q of the positive electrode, the negative electrode, the diaphragm, the electrolyte and the aluminum plastic film disassembled by the lithium ion battery under the coexistence of the positive electrode and the electrolyte (c,e) Combustion heat value Q under coexistence of negative electrode and electrolyte (a，e) The combustion heat value Q of the cathode and the electrolyte in coexistence can be calculated by measuring the same mass ratio, namely only ensuring that the mass ratio of the cathode and the electrolyte in coexistence is twice that of the disassembled cathode and electrolyte of the lithium ion battery (c，e) Combustion heat value Q under coexistence of negative electrode and electrolyte (a，e) Reference is made to the combustion heat value Q of the cathode and the electrolyte in the coexistence (c，e) Is a measurement mode of (a). Preferably, the calorimeter is an oxygen bomb calorimeter.
Wherein, there is no sequence between the thermal runaway measurement step S1 and the disassembly measurement step S2.
And a calculating step S3, wherein energy released in the thermal runaway process of the lithium ion battery is calculated in a weighted mode according to the combustion heat values measured in the thermal runaway measuring step S1 and the combustion heat measuring step S2.
Specifically, the combustion heat value measured in accordance with the thermal runaway measuring step S1 and the disassembly measuring step S2 is the combustion heat value Q of the residue after thermal runaway of the lithium ion battery (z) And the combustion heat value Q of the positive electrode, the negative electrode, the diaphragm, the electrolyte and the aluminum plastic film disassembled by the lithium ion battery in the coexistence of the positive electrode and the electrolyte (c，e) Combustion heat value Q under coexistence of negative electrode and electrolyte (a，e) Calculating energy Q released in thermal runaway process of lithium ion battery in weighting mode (r) The lithium ion battery is conveniently protected from the outside, so that the harm caused by the combustion and explosion of the battery is minimized, the trend of fire spreading is delayed as much as possible, and the time is strived for personnel escape and fire emergency. In particular, the energy Q released in the thermal runaway process of the lithium ion battery is improved by adopting a weighting mode for calculation (r) The accuracy of calculation is further improved, and the heat loss of the lithium ion battery is further improvedThe cognition of the energy released in the control process is improved, so that the accuracy of the external protective measures of the lithium ion battery is improved, the trend of fire spread is further delayed, and more time is striven for personnel escape and fire emergency.
Referring to fig. 2, a flowchart of a calculation step provided in an embodiment of the present invention is shown. As shown, the calculation step S3 includes the following sub-steps:
and a battery combustion heat calculation substep S31, wherein the combustion heat value of the lithium ion battery is calculated in a weighted manner according to the combustion heat value measured in the disassembly measurement step S2.
Specifically, the combustion heat value measured in the disassembly measurement step S2 is namely the combustion heat value Q of the positive electrode, the negative electrode, the diaphragm, the electrolyte and the aluminum plastic film disassembled by the lithium ion battery in the coexistence of the positive electrode and the electrolyte (c，e) Combustion heat value Q under coexistence of negative electrode and electrolyte (a，e) The combustion heat value Q of the lithium ion battery is calculated in a weighting mode, the accuracy of the calculation of the combustion heat value Q of the lithium ion battery is improved by adopting the weighting mode, and then the energy Q released in the thermal runaway process of the lithium ion battery is improved (r) Accuracy of the calculation. The combustion heat value Q of the ion battery is calculated as follows:
Q＝mQ (c，e) +nQ (a，e) +oQ (e) +(1-m)Q (c) +(1-n)Q (a) +Q (g) +Q (l) +Q (s)
wherein m, n and o (0.ltoreq.m, n, o.ltoreq.1) are correction coefficients, Q (c，e) Is the combustion heat value Q of the cathode and the electrolyte in the coexistence (a,e) For the combustion heat value in the coexistence of the cathode and the electrolyte, Q (e) Combustion heat value, Q, of electrolyte for disassembly of lithium ion battery (c) Combustion heat value of positive electrode disassembled for lithium ion battery, Q (a) Combustion heat value of negative electrode disassembled for lithium ion battery, Q (g) Combustion heating value of diaphragm disassembled for lithium ion battery, Q (l) Combustion heat value Q of aluminum plastic film disassembled for lithium ion battery (s) Is irreversible heat.
Wherein irreversible heat Q (s) By positive and negative electrodes of lithium ion batteriesExtremely short-circuited, measuring voltage U of lithium ion battery in circuit, current I of circuit and time t from short-circuited to zero voltage drop in circuit, irreversible heat Q (s) ＝UIt。
And a capability calculation substep S32, wherein the combustion heat value of the lithium ion battery calculated in the battery combustion heat calculation substep S31 and the thermal runaway measurement step are used for measuring the combustion heat value of the S1 lithium ion and calculating the energy released in the thermal runaway process of the lithium ion battery.
Specifically, the combustion heat value Q of the lithium ion battery and the combustion heat value Q of the residue after thermal runaway of the lithium ion battery calculated according to the battery combustion heat calculation sub-step S31 (z) Calculating energy Q released in thermal runaway process of lithium ion battery (r) The method comprises the steps of carrying out a first treatment on the surface of the Wherein, the energy Q released in the thermal runaway process of the lithium ion battery (r) The calculation formula of (2) is as follows:
Q (r) ＝Q-Q (z)
wherein Q is the combustion heat value of the lithium ion battery, Q (z) The combustion heat value of the residue after the lithium ion battery is in thermal runaway.
Calculating the energy Q released in the thermal runaway process of the lithium ion battery by using the formula (r) The combustion heat value of the lithium ion battery and the energy calculation remained after the thermal runaway are combined, and the accuracy of the energy calculation released in the thermal runaway process of the lithium ion battery is further ensured.
In this embodiment, a 10Ah lithium iron phosphate soft package lithium ion battery is taken as an example to describe in detail energy analysis in a thermal runaway process of the lithium ion battery:
firstly, a 0% SOC 10Ah lithium iron phosphate soft package lithium ion battery is subjected to a thermal abuse induced thermal runaway experiment, the battery is subjected to thermal runaway at 170 ℃, further burnt, the temperature of the battery can reach 420 ℃, and residues are collected after the battery is extinguished and cooled. Measuring the combustion heat value of the residue by using an oxygen bomb calorimeter to obtain 570.35KJ heat of the residue, namely the combustion heat value Q of the residue after the 0% SOC 10Ah lithium iron phosphate soft package lithium ion battery is combusted (z) = 570.35KJ; and disassembling the 0% SOC 10Ah lithium iron phosphate soft package lithium ion battery in a glove box to obtain an aluminum plastic filmAfter the positive plate, the negative plate and the diaphragm are cleaned by using dimethyl carbonate, the combustion heat values of the positive plate, the negative plate and the diaphragm are 43.45KJ, 225.23KJ, 533.27KJ and 223.31KJ respectively measured by using an oxygen bomb calorimeter, and the combustion heat value of the electrolyte is 443.82KJ measured by using the oxygen bomb calorimeter; measuring combustion heat values under the coexistence of the anode/cathode material and electrolyte by using an oxygen bomb calorimeter (wherein the mass of the anode/cathode is the total mass of the anode in the battery and the mass of the electrolyte is 1/2 of the mass of the electrolyte in the battery), so as to obtain the combustion heat values of 556.38KJ and 835.46KJ respectively;
then, assuming that 1/2 of the electrolyte spontaneously ignites, m=n=0.25, o=0.5, and the combustion heat value of the lithium iron phosphate battery is calculated by a weighted manner as follows: q= 1405.51KJ;
finally, according to the combustion heat value of the lithium iron phosphate battery and the combustion heat value of residues after the thermal runaway of the 0% SOC 10Ah lithium iron phosphate soft package lithium ion battery, calculating the energy Q released in the thermal runaway process of the lithium ion battery (r) ＝835.16KJ。
In summary, the energy analysis method in the thermal runaway process of the lithium ion battery provided by the embodiment adopts an indirect method to measure the combustion heat value before and after the thermal runaway of the lithium ion battery, so that the energy released in the thermal runaway process of the lithium ion battery is analyzed in a weighted mode, and accordingly, the external protection measures of the lithium ion battery are performed, the harm caused by the combustion and explosion of the battery is minimized, the trend of fire spread is delayed as much as possible, and time is striven for personnel escape and fire emergency.
In particular, the energy Q released in the thermal runaway process of the lithium ion battery is improved by adopting a weighting mode for calculation (r) The accuracy of calculation is further improved, and the cognition of energy released in the thermal runaway process of the lithium ion battery is further improved, so that the accuracy of external protective measures of the lithium ion battery is improved, the trend of fire spread is further delayed, and more time is striven for personnel escape and fire emergency.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (6)
1. The energy analysis method in the thermal runaway process of the lithium ion battery is characterized by comprising the following steps of:
a thermal runaway measurement step, namely selecting a lithium ion battery to carry out a thermal runaway experiment, collecting residues after the thermal runaway of the lithium ion battery, and measuring the combustion heat value of the residues through a calorimeter;
a disassembly measurement step, namely selecting another lithium ion battery in the same state as the lithium ion battery selected in the thermal runaway measurement step, disassembling the lithium ion battery, separating the positive electrode, the negative electrode, the electrolyte, the diaphragm and the aluminum-plastic film, measuring the combustion heat values of the positive electrode, the negative electrode, the electrolyte, the diaphragm and the aluminum-plastic film through a calorimeter, and measuring the combustion heat values of the positive electrode and the electrolyte in the coexistence and the combustion heat values of the negative electrode and the electrolyte in the coexistence through the calorimeter; the electrolyte under the coexistence of the positive electrode and the electrolyte is half of the electrolyte for disassembling the lithium battery; the electrolyte under the coexistence of the negative electrode and the electrolyte is half of the electrolyte for disassembling the lithium battery;
a calculation step of calculating energy released in the thermal runaway process of the lithium ion battery in a weighted manner according to the combustion heat values measured in the thermal runaway measurement step and the disassembly measurement step;
the calculating step comprises the following sub-steps:
a battery combustion heat calculation sub-step, namely calculating the combustion heat value of the lithium ion battery in a weighted mode according to the combustion heat value measured in the disassembly measurement step;
a capability calculation sub-step of calculating the energy released in the thermal runaway process of the lithium ion battery according to the combustion heat value of the lithium ion battery calculated in the battery combustion heat calculation sub-step and the lithium ion combustion heat value measured in the thermal runaway measurement step;
in the battery combustion heat calculation sub-step, the calculation formula of the combustion heat value Q of the lithium ion battery is as follows:
wherein m, n and o are%) For correction factor +.>For the combustion heat value in the coexistence of the positive electrode and the electrolyte, < >>For the combustion heat value in the coexistence of the negative electrode and the electrolyte, < >>Combustion heat value of electrolyte disassembled for the lithium ion battery, < >>Combustion heat value of positive electrode disassembled for the lithium ion battery,>combustion heat value of negative electrode disassembled for the lithium ion battery,>combustion heat value of separator disassembled for the lithium ion battery, +.>Combustion heat value of aluminum plastic film disassembled for lithium ion battery, < >>Is irreversible heat;
in the capability calculation sub-step, the energy released in the thermal runaway process of the lithium ion batteryThe calculation formula of (2) is as follows:
wherein Q is the combustion heat value of the lithium ion battery,and the combustion heat value of the residue after the lithium ion battery is in thermal runaway.
2. The method for energy analysis in a thermal runaway process of a lithium ion battery according to claim 1, wherein,
in the thermal runaway measuring step or the disassembly measuring step, the combustion heat value of each portion is measured by:
the substances were equally divided into several parts, and the combustion heat value of the substances was calculated by measuring the combustion heat value of one of them.
3. The method for energy analysis in a thermal runaway process of a lithium ion battery according to claim 1, wherein,
in the thermal runaway measurement step or the disassembly measurement step, the calorimeter is an oxygen bomb calorimeter.
4. The method for energy analysis in a thermal runaway process of a lithium ion battery according to claim 1, wherein,
in the thermal runaway measurement step, overcharging, short-circuiting, thermal abuse or needling is adopted to induce the lithium ion battery to generate thermal runaway.
5. The method for energy analysis in a thermal runaway process of a lithium ion battery according to claim 1, wherein,
in the disassembly measurement step, the disassembled lithium ion battery is in a full state, and the disassembly operation is performed in a glove box.
6. The method for energy analysis in a thermal runaway process of a lithium ion battery according to claim 1, wherein,
in the disassembly measurement step, after the lithium ion battery is disassembled, the separated positive electrode, the separated negative electrode, the separated diaphragm, the separated electrolyte and the separated aluminum-plastic film are cleaned by adopting dimethyl carbonate.
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| CN107390136A (en) * | 2017-08-15 | 2017-11-24 | 北京航空航天大学 | A kind of aging lithium ion battery thermal runaway modeling method |
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