CN115963400A - Quantitative calculation method and system for hydrogen after thermal runaway of lithium ion battery - Google Patents
Quantitative calculation method and system for hydrogen after thermal runaway of lithium ion battery Download PDFInfo
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Abstract
The application provides a method and a system for quantitatively calculating hydrogen after thermal runaway of a lithium ion battery, wherein the method comprises the following steps: acquiring the average pressure in the battery when the thermal runaway of the lithium ion battery is finished, the hydrogen adsorption capacity during balance under the average pressure, the volume of an electric core in the battery, the average temperature in the battery when the thermal runaway of the battery is started and the value range of the charge state of the battery; determining the adsorption capacity of the electrolyte to the hydrogen after the thermal runaway of the battery according to the average pressure and the adsorption capacity of the hydrogen; determining the amount of hydrogen overflowing from the lithium ion battery according to the volume of the battery cell, the average temperature and the value range of the charge state of the battery; and determining the amount of hydrogen generated after the lithium ion battery is thermally out of control based on the adsorption amount and the overflowed hydrogen amount. According to the technical scheme, the calculation accuracy of the hydrogen amount of the lithium ion battery after thermal runaway is improved, and further a theoretical basis is provided for the deep research of the thermal runaway danger of the battery.
Description
Technical Field
The application relates to the technical field of lithium batteries, in particular to a quantitative calculation method and system for hydrogen after thermal runaway of a lithium ion battery.
Background
The energy storage system is used as an important means for guaranteeing reliable power supply of the power system, and is widely applied to peak clipping and valley filling, compensation of power load, adjustment of power frequency and reduction of power cost, and has great use value. The lithium ion battery has excellent charge-discharge cycle characteristics, higher energy density and energy utilization rate and good safety performance, and greatly improves the wide application of the lithium ion battery in the technical field of energy storage. In recent years, the loading amount of energy storage power stations increases year by year, and accordingly, safety accidents of the energy storage power stations increase year by year, an explosion accident of the energy storage power stations is a typical case, and the energy storage batteries used by the exploded energy storage power stations are lithium ion batteries, which indicates that safety problems caused by the large-scale use of the lithium ion batteries in the energy storage power stations need to be solved urgently.
At present, research on the types and the amounts of gases generated by thermal runaway of lithium ion batteries has been advanced, for example, a paper, "thermal runaway flue gas flow research in prefabricated cabins of energy storage lithium ion batteries" introduces that some 23 Ah lithium ion batteries generate H2, CO2, CH4, C2H4 and other gases, and the research researches the gas generation condition of the lithium ion batteries under the condition of 100% charge State (soc) under the condition of constant volume and oxygen exclusion. Wherein H 2 The hydrogen is one of main gases for releasing gas by thermal runaway of the battery, the explosion limit range of the hydrogen is 4-75.6%, the explosion limit range is very large, the gas has great influence on the explosion risk of the mixed gas, the explosion limit range of the mixed gas can be increased, the mixed gas is easier to explode, and therefore H research is carried out 2 The generation volume of (2) is imperative. However, for lithium ion batteries of different manufacturers, due to the difference of additives, electrolyte and battery capacity, H is generated 2 The volumes also vary. Therefore, it is highly desirable to provide a customized H for lithium ion batteries 2 The volume calculation method provides a theoretical basis for further research on the thermal runaway danger of the lithium ion battery.
Disclosure of Invention
The application provides a quantitative calculation method and a quantitative calculation system for hydrogen after lithium ion battery thermal runaway, which at least solve the problem that exclusive H cannot be customized for lithium ion battery 2 The accurate calculation method of the volume is a technical problem.
An embodiment of the first aspect of the present application provides a method for quantitatively calculating hydrogen after thermal runaway of a lithium ion battery, where the method includes:
acquiring the average pressure in the battery when the thermal runaway of the lithium ion battery is finished, the hydrogen adsorption capacity during balance under the average pressure, the volume of an electric core in the battery, the average temperature in the battery when the thermal runaway of the battery is started and the value range of the charge state of the battery;
determining the adsorption capacity of the electrolyte to hydrogen after the thermal runaway of the lithium ion battery according to the average pressure inside the battery when the thermal runaway of the lithium ion battery is finished and the adsorption capacity of the hydrogen during balance under the average pressure;
determining the amount of hydrogen overflowing from the lithium ion battery according to the volume of the battery cell in the battery, the average temperature in the battery at the beginning of thermal runaway of the battery and the value range of the state of charge of the battery;
and determining the amount of hydrogen generated after the thermal runaway of the lithium ion battery based on the adsorption amount of the electrolyte to the hydrogen after the thermal runaway of the lithium ion battery and the amount of the hydrogen overflowed from the lithium ion battery.
Preferably, the calculation formula of the adsorption amount of the electrolyte to the hydrogen after the thermal runaway of the lithium ion battery is as follows:
in the formula (I), the compound is shown in the specification,
the adsorption capacity of the electrolyte on the hydrogen after the lithium ion battery is out of control by heat is judged by the evaluation unit>
Is the average pressure inside the lithium ion battery at the end of the thermal runaway of said battery, is->
Is the amount of hydrogen adsorbed at equilibrium under average pressure>
Is an equilibrium constant of adsorption and desorption of hydrogen gas>
Based on the quality of the electrolyte>
Value range for the state of charge of the battery>
Is atmospheric pressure, is>
Is a constant of the relationship between battery thermal runaway and battery State of health (soh).
Further, the calculation formula of the hydrogen amount overflowing from the lithium ion battery is as follows:
in the formula (I), the compound is shown in the specification,
for the amount of hydrogen which overflows from the lithium ion battery, is/are>
Based on the average value of the volume of hydrogen produced in the thermal runaway decomposition of an electrolyte>
Is ambient pressure, is based on>
Is the average temperature inside the battery at the beginning of a thermal runaway of the battery, <' >>
For a cell size related quantity, is selected>
For a battery capacity correction factor, < >>
Is the volume of the cell in the battery.
Further, the determining the amount of hydrogen generated after the thermal runaway of the lithium ion battery based on the adsorption amount of the electrolyte to the hydrogen after the thermal runaway of the lithium ion battery and the amount of hydrogen overflowing from the lithium ion battery includes:
determining the sum of the adsorption quantity of the electrolyte to the hydrogen after the lithium ion battery is thermally out of control and the quantity of the hydrogen overflowing from the lithium ion battery;
and taking the sum of the adsorption quantity of the electrolyte to the hydrogen after the lithium ion battery is thermally out of control and the quantity of the hydrogen overflowed from the lithium ion battery as the quantity of the hydrogen generated after the lithium ion battery is thermally out of control.
Further, the calculation formula of the battery size related quantity is as follows:
in the formula (I), the compound is shown in the specification,
for the value of the farthest distance from the geometric midpoint to the geometric edge of the cell>
Is a coordinate value with a value range of (-R, R).
An embodiment of a second aspect of the present application provides a quantitative calculation system for hydrogen after thermal runaway of a lithium ion battery, where the system includes:
the acquisition module is used for acquiring the average pressure in the battery when the thermal runaway of the lithium ion battery is finished, the hydrogen adsorption capacity during balance under the average pressure, the volume of an electric core in the battery, the average temperature in the battery when the thermal runaway of the battery is started and the value range of the charge state of the battery;
the first determination module is used for determining the adsorption quantity of the electrolyte to the hydrogen after the thermal runaway of the lithium ion battery according to the average pressure in the battery when the thermal runaway of the lithium ion battery is finished and the adsorption quantity of the hydrogen during the balance under the average pressure;
the second determination module is used for determining the amount of hydrogen overflowing from the lithium ion battery according to the volume of an electric core in the battery, the average temperature in the battery at the beginning of thermal runaway of the battery and the value range of the state of charge of the battery;
and the third determining module is used for determining the amount of hydrogen generated after the thermal runaway of the lithium ion battery based on the adsorption amount of the electrolyte to the hydrogen after the thermal runaway of the lithium ion battery and the amount of the hydrogen overflowed from the lithium ion battery.
Preferably, the calculation formula of the adsorption amount of the electrolyte to the hydrogen after the thermal runaway of the lithium ion battery is as follows:
in the formula (I), the compound is shown in the specification,
the adsorption capacity of the electrolyte on the hydrogen after the lithium ion battery is out of control by heat is judged by the evaluation unit>
Is the average pressure inside the lithium ion battery at the end of thermal runaway of the battery, device for combining or screening>
Is the amount of hydrogen adsorbed at equilibrium under average pressure>
Is the equilibrium constant of the adsorption and desorption of hydrogen>
Is the quality of the electrolyte>
Value range for the state of charge of the battery>
Is atmospheric pressure, is>
Is a relation constant between the thermal runaway of the battery and the SOH.
Preferably, the third determining module includes:
the first determining unit is used for determining the sum of the adsorption quantity of the electrolyte to the hydrogen after the lithium ion battery is thermally out of control and the quantity of the hydrogen overflowing from the lithium ion battery;
and the second determination unit is used for taking the sum of the adsorption quantity of the electrolyte to the hydrogen after the lithium ion battery is thermally out of control and the quantity of the hydrogen overflowed from the lithium ion battery as the hydrogen quantity generated after the lithium ion battery is thermally out of control.
An embodiment of a third aspect of the present application provides an electronic device, including: memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the method as described in the embodiments of the first aspect when executing the program.
An embodiment of a fourth aspect of the present application provides a computer-readable storage medium, on which a computer program is stored, which when executed by a processor implements the method according to the embodiment of the first aspect.
The technical scheme provided by the embodiment of the application at least has the following beneficial effects:
the application provides a method and a system for quantitatively calculating hydrogen after thermal runaway of a lithium ion battery, wherein the method comprises the following steps: acquiring the average pressure in the battery when the thermal runaway of the lithium ion battery is finished, the hydrogen adsorption capacity during balance under the average pressure, the volume of an electric core in the battery, the average temperature in the battery when the thermal runaway of the battery is started and the value range of the charge state of the battery; determining the adsorption capacity of the electrolyte to hydrogen after the thermal runaway of the lithium ion battery according to the average pressure inside the battery when the thermal runaway of the lithium ion battery is finished and the adsorption capacity of the hydrogen during balance under the average pressure; determining the amount of hydrogen overflowing from the lithium ion battery according to the volume of an electric core in the battery, the average temperature in the battery at the beginning of thermal runaway of the battery and the value range of the state of charge of the battery; and determining the amount of hydrogen generated after the thermal runaway of the lithium ion battery based on the adsorption amount of the electrolyte to the hydrogen after the thermal runaway of the lithium ion battery and the amount of the hydrogen overflowing from the lithium ion battery. According to the technical scheme, the calculation accuracy of the hydrogen amount of the lithium ion battery after thermal runaway is improved, and further a theoretical basis is provided for deep research on the thermal runaway danger of the battery.
Additional aspects and advantages of the present application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the present application.
Drawings
The above and/or additional aspects and advantages of the present application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a flowchart of a method for quantitatively calculating hydrogen after thermal runaway of a lithium ion battery according to an embodiment of the present application;
FIG. 2 is a graph comparing a data curve obtained based on the calculation method of the present application with data measured from a real experiment according to an embodiment of the present application;
fig. 3 is a block diagram of a quantitative calculation system for hydrogen after thermal runaway of a lithium ion battery according to an embodiment of the present application;
fig. 4 is a block diagram of a third determination module provided according to an embodiment of the present application.
Detailed Description
Reference will now be made in detail to the embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are illustrative and intended to explain the present application and should not be construed as limiting the present application.
The application provides a method and a system for quantitatively calculating hydrogen after thermal runaway of a lithium ion battery, wherein the method comprises the following steps: acquiring the average pressure in the battery when the thermal runaway of the lithium ion battery is finished, the hydrogen adsorption capacity during balance under the average pressure, the volume of an electric core in the battery, the average temperature in the battery when the thermal runaway of the battery is started and the value range of the charge state of the battery; determining the adsorption capacity of the electrolyte to the hydrogen after the thermal runaway of the lithium ion battery according to the average pressure in the battery when the thermal runaway of the lithium ion battery is finished and the adsorption capacity of the hydrogen during the balance under the average pressure; determining the amount of hydrogen overflowing from the lithium ion battery according to the volume of an electric core in the battery, the average temperature in the battery at the beginning of thermal runaway of the battery and the value range of the state of charge of the battery; and determining the amount of hydrogen generated after the thermal runaway of the lithium ion battery based on the adsorption amount of the electrolyte to the hydrogen after the thermal runaway of the lithium ion battery and the amount of the hydrogen overflowed from the lithium ion battery. According to the technical scheme, the calculation accuracy of the hydrogen amount of the lithium ion battery after thermal runaway is improved, and further a theoretical basis is provided for the deep research of the thermal runaway danger of the battery.
A quantitative calculation method and a quantitative calculation system for hydrogen after thermal runaway of a lithium ion battery according to an embodiment of the present application are described below with reference to the accompanying drawings.
Example one
Fig. 1 is a flowchart of a quantitative calculation method for hydrogen after thermal runaway of a lithium ion battery according to an embodiment of the present application, and as shown in fig. 1, the method includes:
step 1: acquiring the average pressure in the battery when the thermal runaway of the lithium ion battery is finished, the hydrogen adsorption capacity during balance under the average pressure, the volume of an electric core in the battery, the average temperature in the battery when the thermal runaway of the battery is started and the value range of the charge state of the battery;
and 2, step: determining the adsorption capacity of the electrolyte to the hydrogen after the thermal runaway of the lithium ion battery according to the average pressure in the battery when the thermal runaway of the lithium ion battery is finished and the adsorption capacity of the hydrogen during the balance under the average pressure;
in the embodiment of the present disclosure, the calculation formula of the adsorption amount of the electrolyte to hydrogen after the thermal runaway of the lithium ion battery is as follows:
in the formula (I), the compound is shown in the specification,
the adsorption quantity of the electrolyte to the hydrogen after the lithium ion battery is out of control due to heat is determined, and the adsorption quantity is greater than or equal to the adsorption quantity of the electrolyte to the hydrogen after the lithium ion battery is out of control due to heat>
Is the average pressure inside the lithium ion battery at the end of the thermal runaway of said battery, is->
Is the amount of hydrogen adsorbed at equilibrium under average pressure>
Is the equilibrium constant of the adsorption and desorption of hydrogen>
Based on the quality of the electrolyte>
Value range for the state of charge of the battery>
Is atmospheric pressure, is>
Is a relation constant between the thermal runaway of the battery and the SOH.
And 3, step 3: determining the amount of hydrogen overflowing from the lithium ion battery according to the volume of an electric core in the battery, the average temperature in the battery at the beginning of thermal runaway of the battery and the value range of the state of charge of the battery;
in the embodiment of the present disclosure, the calculation formula of the amount of hydrogen overflowed from the lithium ion battery is as follows:
in the formula (I), the compound is shown in the specification,
for the amount of hydrogen gas overflowing from the lithium ion battery，/>
For the mean value of the volume of hydrogen produced by the thermal runaway decomposition of the electrolyte>
Is ambient pressure, is based on>
Is the average temperature inside the battery at the beginning of a thermal runaway of the battery, <' >>
For a cell size related quantity, is selected>
For cell capacity correction factor +>
Is the volume of the cell in the battery.
Wherein the battery size related quantity is calculated as follows:
in the formula (I), the compound is shown in the specification,
is the value of the farthest distance from the geometric midpoint to the geometric edge of the cell, <' >>
The value range is (-R, R) as a coordinate value.
Further, if the shape of the battery cell is cylindrical, the volume of the battery cell is determined to be V cell =πr 2 h=S 1 h，S 1 The cell height is h;
if the shape of the battery cell is a square block, determining that the volume of the battery cell is V cell =abh=S 2 h，S 2 The bottom area of the square battery cell is shown.
And 4, step 4: and determining the amount of hydrogen generated after the thermal runaway of the lithium ion battery based on the adsorption amount of the electrolyte to the hydrogen after the thermal runaway of the lithium ion battery and the amount of the hydrogen overflowed from the lithium ion battery.
In an embodiment of the present disclosure, step 4 specifically includes:
step 4-1: determining the sum of the adsorption quantity of the electrolyte to the hydrogen after the lithium ion battery is thermally out of control and the quantity of the hydrogen overflowing from the lithium ion battery;
step 4-2: and taking the sum of the adsorption quantity of the electrolyte to the hydrogen after the lithium ion battery is thermally out of control and the quantity of the hydrogen overflowed from the lithium ion battery as the quantity of the hydrogen generated after the lithium ion battery is thermally out of control.
Illustratively, using formulas
Calculating the hydrogen amount generated after the lithium ion battery is out of control thermally, wherein the hydrogen amount is combined with the temperature of the lithium ion battery>
The amount of hydrogen generated after the thermal runaway of the lithium ion battery.
It should be noted that the method provided by this embodiment is applicable to lithium ion batteries of various models.
To more clearly illustrate the embodiment of the present application, the hydrogen volume calculation formula of the present embodiment is compared with the experimentally measured exothermic volume data of hydrogen gas generated by thermal runaway of the LFP cell of 60Ah type, and it is found that the algorithm has a high degree of fitting of the pre-experimental results, where R is 2 Values as high as 0.9336.
In the formula, the relationship between the hydrogen release amount and the SOC is:
wherein, the first and the second end of the pipe are connected with each other,
for the amount of hydrogen which overflows from the lithium ion battery, is/are>
The volume of the hydrogen generated by the electrolyte in the thermal runaway process of a certain battery is measured to be about 4.1L by experiments;
wherein, the first and the second end of the pipe are connected with each other,
the average pressure inside the lithium ion battery at the end of thermal runaway of the battery is generally 1.5 × 105 kPa; />
The value is measured to be 1.0 × 105 Pa in the real-time example, which is the atmospheric pressure, namely the standard atmospheric pressure; />
The equilibrium constant of hydrogen adsorption and desorption, namely the equilibrium constant of hydrogen adsorption and desorption to certain brand of battery electrolyte, is 1.95 multiplied by 10 < -5 > in numerical value; />
The value is 0.598 ml/g, L, of the hydrogen adsorption capacity in equilibrium under the average pressure; />
In this example, the mass of the electrolyte is: 60Ah × 1.5 × (1.073 + 0.782)/2 = 83.475 g; />
The adsorption capacity of the electrolyte to hydrogen after the lithium ion battery is out of control due to heat; />
The constant is a relation constant between the thermal runaway and the SOH of the battery, namely a proportionality coefficient of the relation between the hydrogen generated by the thermal runaway of the battery and the SOH. The generated gases are different, and the value is different, when the calculated adsorbed gas is hydrogen, the value of alpha is 0.05; />
Is an actual measurement of the ambient pressure, i.e. the atmospheric pressure, in Pa, of theThe values in the examples are equal to 10672 Pa; />
The average temperature inside the cell at the onset of thermal runaway of the cell was 129.48 ℃ in value; />
The volume of the cell in the battery is expressed in dm3, and the volume of the cell in the battery is about 0.693dm3; />
Is a cell size related quantity, numerically t = R/a, where +>
The value is the farthest distance value from the geometric midpoint of the battery to the geometric edge, a is a coordinate value, and the value range is (-R, R); />
The correction coefficient of the battery capacity is the maximum SOC value which can be reached by the battery overcharging at 0.1C, and the value is 130;
the value range of the state of charge of the battery is (0, 100).
To sum up, the calculation formula can be:
when x = 50; y =17.535 with a true value of 16.687 by about 5%.
For example, as shown in fig. 2, the volume of hydrogen released after thermal runaway of the lithium ion battery calculated in this embodiment is shown
The comparison graph of the algorithm curve and the data measured by the real experiment.
In summary, the quantitative calculation method for hydrogen after thermal runaway of the lithium ion battery provided by the embodiment improves the calculation accuracy of the hydrogen after thermal runaway of the lithium ion battery, and further provides a theoretical basis for deep research on the risk of thermal runaway of the battery.
Example two
Fig. 3 is a structural diagram of a quantitative calculation system for hydrogen after a lithium ion battery thermal runaway, according to an embodiment of the present application, and as shown in fig. 3, the system includes:
the acquiring module 100 is configured to acquire an average pressure inside the battery at the end of thermal runaway of the lithium ion battery, a hydrogen adsorption amount at equilibrium under the average pressure, a volume of an electric core inside the battery, an average temperature inside the battery at the start of thermal runaway of the battery, and a value range of a state of charge of the battery;
a first determining module 200, configured to determine, according to an average pressure inside the battery at the end of the thermal runaway of the lithium ion battery and a hydrogen adsorption amount during balancing under the average pressure, an adsorption amount of an electrolyte to hydrogen after the thermal runaway of the lithium ion battery;
a second determining module 300, configured to determine, according to the volume of an electric core in the battery, the average temperature inside the battery at the start of thermal runaway of the battery, and a value range of a state of charge of the battery, an amount of hydrogen that overflows from the lithium ion battery;
and a third determining module 400, configured to determine the amount of hydrogen generated after the thermal runaway of the lithium ion battery based on the adsorption amount of hydrogen to the electrolyte after the thermal runaway of the lithium ion battery and the amount of hydrogen overflowing from the lithium ion battery.
Wherein, the calculation formula of the adsorption capacity of the electrolyte to the hydrogen after the thermal runaway of the lithium ion battery is as follows:
in the formula (I), the compound is shown in the specification,
the adsorption quantity of the electrolyte to the hydrogen after the lithium ion battery is out of control due to heat is determined, and the adsorption quantity is greater than or equal to the adsorption quantity of the electrolyte to the hydrogen after the lithium ion battery is out of control due to heat>
Is the average pressure inside the lithium ion battery at the end of thermal runaway of the battery, device for selecting or keeping>
Based on the amount of adsorbed hydrogen at equilibrium under mean pressure>
Is the equilibrium constant of the adsorption and desorption of hydrogen>
Is the quality of the electrolyte>
Value range for the state of charge of the battery>
Is atmospheric pressure, is>
Is a relation constant between the thermal runaway of the battery and the SOH.
Wherein, the calculation formula of the hydrogen amount overflowing from the lithium ion battery is as follows:
in the formula (I), the compound is shown in the specification,
for the amount of hydrogen which overflows from the lithium ion battery, is/are>
For the mean value of the volume of hydrogen produced by the thermal runaway decomposition of the electrolyte>
Is ambient pressure, is based on>
Is the average temperature inside the battery at the beginning of a thermal runaway of the battery, <' >>
For a cell size related quantity>
For a battery capacity correction factor, < >>
Is the volume of a cell in the battery, wherein the calculation formula of the battery size related quantity is as follows: />
In, is greater than or equal to>
Is the value of the farthest distance from the geometric midpoint to the geometric edge of the cell, <' >>
Is a coordinate value with a value range of->
。
In an embodiment of the disclosure, as shown in fig. 4, the third determining module 400 includes:
a first determining unit 401, configured to determine a sum of an adsorption amount of hydrogen to the electrolyte after the lithium ion battery thermal runaway and an amount of hydrogen overflowing from the lithium ion battery;
a second determining unit 402, configured to use a sum of an adsorption amount of hydrogen by the electrolyte after the lithium ion battery thermal runaway and an amount of hydrogen overflowing from the lithium ion battery as a hydrogen amount generated after the lithium ion battery thermal runaway.
In summary, the quantitative calculation system for hydrogen after thermal runaway of the lithium ion battery provided by this embodiment improves the calculation accuracy of the hydrogen amount after thermal runaway of the lithium ion battery, and further provides a theoretical basis for deep research on the risk of thermal runaway of the battery.
EXAMPLE III
In order to implement the above embodiments, the present disclosure also provides an electronic device, including: the system comprises a memory, a processor and a computer program stored on the memory and capable of running on the processor, wherein the processor executes the program to realize the method according to the first embodiment.
Example four
In order to implement the above-mentioned embodiments, the present disclosure also proposes a computer-readable storage medium on which a computer program is stored, which when executed by a processor implements the method according to the first embodiment.
In the description herein, reference to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Moreover, various embodiments or examples and features of various embodiments or examples described in this specification can be combined and combined by one skilled in the art without being mutually inconsistent.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing steps of a custom logic function or process, and alternate implementations are included within the scope of the preferred embodiment of the present application in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present application.
Although embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present application, and that variations, modifications, substitutions and alterations may be made to the above embodiments by those of ordinary skill in the art within the scope of the present application.
Claims (10)
1. A quantitative calculation method for hydrogen after thermal runaway of a lithium ion battery is characterized by comprising the following steps:
acquiring the average pressure in the battery when the thermal runaway of the lithium ion battery is finished, the hydrogen adsorption capacity during balance under the average pressure, the volume of an electric core in the battery, the average temperature in the battery when the thermal runaway of the battery is started and the value range of the charge state of the battery;
determining the adsorption capacity of the electrolyte to the hydrogen after the thermal runaway of the lithium ion battery according to the average pressure in the battery when the thermal runaway of the lithium ion battery is finished and the adsorption capacity of the hydrogen during the balance under the average pressure;
determining the amount of hydrogen overflowing from the lithium ion battery according to the volume of an electric core in the battery, the average temperature in the battery at the beginning of thermal runaway of the battery and the value range of the state of charge of the battery;
and determining the amount of hydrogen generated after the thermal runaway of the lithium ion battery based on the adsorption amount of the electrolyte to the hydrogen after the thermal runaway of the lithium ion battery and the amount of the hydrogen overflowing from the lithium ion battery.
2. The method according to claim 1, wherein the calculation formula of the adsorption amount of the electrolyte to the hydrogen gas after the thermal runaway of the lithium ion battery is as follows:
in the formula (I), the compound is shown in the specification,
the adsorption quantity of the electrolyte to the hydrogen after the lithium ion battery is out of control due to heat is determined, and the adsorption quantity is greater than or equal to the adsorption quantity of the electrolyte to the hydrogen after the lithium ion battery is out of control due to heat>
Is the average pressure inside the lithium ion battery at the end of the thermal runaway of said battery, is->
Is the amount of hydrogen adsorbed at equilibrium under average pressure>
Is the equilibrium constant of the adsorption and desorption of hydrogen>
Is the quality of the electrolyte>
Value range for the state of charge of the battery>
Is at the atmospheric pressure and is,
is a relation constant between the thermal runaway of the battery and the SOH.
3. The method of claim 2, wherein the amount of hydrogen spilled from the lithium ion battery is calculated as follows:
in the formula (I), the compound is shown in the specification,
in order to cover the amount of hydrogen which overflows from a lithium ion battery>
For the mean value of the volume of hydrogen produced by the thermal runaway decomposition of the electrolyte>
Is ambient pressure, is based on>
Is the average temperature in the battery at the beginning of a thermal runaway of the battery>
For a cell size related quantity, is selected>
For a battery capacity correction factor, < >>
Is the volume of the cell in the battery.
4. The method of claim 3, wherein the determining the amount of hydrogen generated after the thermal runaway of the lithium ion battery based on the amount of hydrogen adsorbed by the electrolyte after the thermal runaway of the lithium ion battery and the amount of hydrogen spilled from the lithium ion battery comprises:
determining the sum of the adsorption quantity of the electrolyte to the hydrogen after the lithium ion battery is thermally out of control and the quantity of the hydrogen overflowing from the lithium ion battery;
and taking the sum of the adsorption quantity of the electrolyte to the hydrogen after the lithium ion battery is thermally out of control and the quantity of the hydrogen overflowed from the lithium ion battery as the quantity of the hydrogen generated after the lithium ion battery is thermally out of control.
5. The method of claim 3, wherein the battery size related quantity is calculated as follows:
in the formula (I), the compound is shown in the specification,
is the value of the farthest distance from the geometric midpoint to the geometric edge of the cell, <' >>
Is a coordinate value with a value range of (-R, R).
6. A quantitative calculation system for hydrogen after thermal runaway of a lithium ion battery is characterized by comprising the following components:
the acquisition module is used for acquiring the average pressure in the battery when the thermal runaway of the lithium ion battery is finished, the hydrogen adsorption capacity during balance under the average pressure, the volume of an electric core in the battery, the average temperature in the battery when the thermal runaway of the battery starts and the value range of the charge state of the battery;
the first determination module is used for determining the adsorption quantity of the electrolyte to the hydrogen after the thermal runaway of the lithium ion battery according to the average pressure in the battery when the thermal runaway of the lithium ion battery is finished and the adsorption quantity of the hydrogen during the balance under the average pressure;
the second determination module is used for determining the amount of hydrogen overflowing from the lithium ion battery according to the volume of an electric core in the battery, the average temperature in the battery at the beginning of thermal runaway of the battery and the value range of the state of charge of the battery;
and the third determining module is used for determining the amount of hydrogen generated after the thermal runaway of the lithium ion battery based on the adsorption amount of the electrolyte to the hydrogen after the thermal runaway of the lithium ion battery and the amount of the hydrogen overflowed from the lithium ion battery.
7. The system of claim 6, wherein the calculation of the amount of hydrogen adsorbed by the electrolyte after thermal runaway in the lithium ion battery is as follows:
in the formula (I), the compound is shown in the specification,
the adsorption capacity of the electrolyte on the hydrogen after the lithium ion battery is out of control by heat is judged by the evaluation unit>
Is the average pressure inside the lithium ion battery at the end of the thermal runaway of said battery, is->
Is the amount of hydrogen adsorbed at equilibrium under average pressure>
Is the equilibrium constant of the adsorption and desorption of hydrogen>
Is the quality of the electrolyte>
Value range for the state of charge of the battery>
Is atmospheric pressure, <' > based on>
Is a relation constant between the thermal runaway and the SOH of the battery.
8. The system of claim 6, wherein the third determination module comprises:
the first determination unit is used for determining the sum of the adsorption quantity of the electrolyte to the hydrogen after the lithium ion battery is thermally out of control and the quantity of the hydrogen overflowing from the lithium ion battery;
and the second determination unit is used for taking the sum of the adsorption quantity of the electrolyte to the hydrogen after the lithium ion battery is thermally out of control and the quantity of the hydrogen overflowed from the lithium ion battery as the hydrogen quantity generated after the lithium ion battery is thermally out of control.
9. An electronic device, comprising: memory, processor and computer program stored on the memory and executable on the processor, which when executed by the processor implements the method of any of claims 1 to 5.
10. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the method according to any one of claims 1 to 5.
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