CN114397100A - Method and device for determining installation number of explosion-proof valves - Google Patents
Method and device for determining installation number of explosion-proof valves Download PDFInfo
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- CN114397100A CN114397100A CN202111643821.3A CN202111643821A CN114397100A CN 114397100 A CN114397100 A CN 114397100A CN 202111643821 A CN202111643821 A CN 202111643821A CN 114397100 A CN114397100 A CN 114397100A
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Abstract
The application provides a method and a device for determining the installation quantity of explosion-proof valves, which are applied to a battery pack, wherein the battery pack comprises a plurality of battery cells, and the method comprises the following steps: the method comprises the steps of obtaining an air leakage critical pressure value of a battery pack sealing shell, determining the gas production rate when a target battery core is out of control due to heat and the ventilation rate of a single explosion-proof valve after the explosion-proof valve is opened under a target pressure value, determining the ratio of the gas production rate to the ventilation rate as the installation number of the explosion-proof valve on the battery pack sealing shell, and determining the installation number of the explosion-proof valve when the ratio of the gas production rate to the ventilation rate is less than or equal to the air leakage critical pressure value of the battery pack sealing shell, wherein the explosion-proof valve is opened, the gas production rate of the target battery core and the ventilation rate of the single explosion-proof valve are determined at the moment, and the installation number of the explosion-proof valve determined in this way can meet the requirement of determining the installation number of the explosion-proof valve on the sealing shell, and can prolong the explosion time of a battery pack and realize the function of the explosion-proof valve at lower cost.
Description
Technical Field
The invention relates to the field of energy, in particular to a method and a device for determining the installation quantity of explosion-proof valves.
Background
With the technological development of the current society, more and more fields utilize batteries as power supply energy. Batteries can be divided into a wide variety of categories, with chemical batteries being one of the batteries of interest to users.
Due to the frequent occurrence of the current battery explosion accidents, the safety of the battery is more and more emphasized at present. Batteries are typically mounted within sealed housings, and when a battery is out of control, a large amount of gas is typically emitted, the gas pressure within the sealed housing increases rapidly, and when the gas pressure within the sealed housing reaches a limit, a battery explosion event can occur.
An explosion-proof valve may be installed on the hermetic case so as to delay the time until the battery reaches the explosion, but how to set the number of explosion-proof valves is not described, so that there is currently a need to determine the number of explosion-proof valves installed on the hermetic case.
Disclosure of Invention
In view of the above, an object of the present application is to provide a method and an apparatus for determining the number of explosion-proof valves to be installed on a sealed housing, which can meet the requirement of determining the number of explosion-proof valves to be installed on the sealed housing.
The embodiment of the application provides a method for determining the installation number of explosion-proof valves, which is applied to a battery pack, wherein the battery pack comprises a plurality of battery cells, and the method comprises the following steps:
acquiring a critical pressure value of air leakage of a battery pack sealing shell;
determining the gas production rate when the target battery cell is in thermal runaway and the gas permeation rate of a single explosion-proof valve after the single explosion-proof valve is opened under the target pressure value; the target pressure value is less than or equal to the air leakage critical pressure value;
and determining the ratio of the gas production rate to the gas permeation rate as the installation number of the explosion-proof valve on the battery pack sealing shell.
Optionally, the target battery cell is a single battery cell, and the determining of the gas generation rate when the target battery cell is in thermal runaway and the gas permeation rate of the single explosion-proof valve after being opened at the target pressure value includes:
and determining the gas production rate when the single battery core is in thermal runaway and the gas permeation rate of the single explosion-proof valve after the single explosion-proof valve is opened under the target pressure value.
Optionally, the target battery cell is three adjacent battery cells, and the determining of the gas generation rate when the target battery cell is in thermal runaway and the gas permeation rate of the single explosion-proof valve after being opened at the target pressure value includes:
and determining the gas production rate when the adjacent three battery cells are simultaneously in thermal runaway and the gas permeation rate of the single explosion-proof valve after the single explosion-proof valve is opened under the target pressure value.
Optionally, the method further comprises:
and determining the maximum value of the opening pressure of the explosion-proof valve as the air leakage critical pressure value.
Optionally, the method further comprises:
and determining the maximum value of the opening pressure of the explosion-proof valve as the ratio of the gas leakage critical pressure value to the safety coefficient of the battery pack sealed shell.
Optionally, the obtaining of the critical pressure value of the air leakage of the battery pack sealing shell comprises:
selecting the thinnest wall thickness value of the battery pack sealing shell;
and carrying out simulation calculation by using the thinnest wall thickness value to obtain the air leakage critical pressure value of the battery pack sealing shell.
Optionally, the selecting the thinnest wall thickness value of the battery pack sealing shell comprises:
and selecting the thinnest wall thickness value of the upper sealed shell of the battery pack.
Optionally, the gas production rate is a maximum gas production rate when the target cell is in thermal runaway.
Optionally, the determining the ratio of the gas generation rate and the gas permeation rate as the installation number of the explosion-proof valve on the battery pack sealing shell comprises the following steps:
and if the ratio of the gas production rate to the gas permeation rate is not an integer, determining the integer with the minimum difference value from the integers larger than the ratio as the installation number of the explosion-proof valves on the battery pack sealing shell.
The embodiment of the application provides an explosion-proof valve installation quantity determination device, the device includes:
the acquisition unit is used for acquiring the air leakage critical pressure value of the battery pack sealing shell;
the first determination unit is used for determining the gas production rate when the target battery cell is in thermal runaway and the gas permeation rate of a single explosion-proof valve after the single explosion-proof valve is opened under the target pressure value; the target pressure value is less than or equal to the air leakage critical pressure value;
and the second determination unit is used for determining the ratio of the gas generation rate and the gas permeation rate as the installation number of the explosion-proof valves on the battery pack sealing shell.
The method for determining the installation quantity of the explosion-proof valves is applied to a battery pack, wherein the battery pack comprises a plurality of battery cores, and the method comprises the following steps: obtaining the gas leakage critical pressure value of the battery pack sealing shell, determining the gas production rate when the target electric core is in thermal runaway and the gas permeation rate of a single explosion-proof valve after being opened under the target pressure value, wherein the target pressure value is less than or equal to the gas leakage critical pressure value, determining the ratio of the gas production rate and the gas permeation rate as the installation number of the explosion-proof valves on the battery pack sealing shell, namely, when the target electric core is less than or equal to the gas leakage critical pressure value of the battery pack sealing shell, the explosion-proof valves are already opened, determining the gas production rate when the target electric core is in thermal runaway and the gas permeation rate of the single explosion-proof valve after being opened, determining the ratio of the gas production rate and the gas permeation rate as the installation number of the explosion-proof valves on the battery pack sealing shell, so that the installation number of the explosion-proof valves can meet the requirement of determining the installation number of the explosion-proof valves on the sealing shell, and the installation number can prolong the time of the battery pack to explode, the function of the explosion-proof valve can be realized at lower cost.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic flow chart illustrating a method for determining the installation number of the explosion-proof valves according to an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram showing an installation number determining device of an explosion-proof valve according to an embodiment of the present application.
Detailed Description
In order to make the technical solutions of the present application better understood, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
With the technological development of the current society, more and more fields utilize batteries as power supply energy. Batteries can be divided into a wide variety of categories, with chemical batteries being one of the batteries of interest to users.
Due to the frequent occurrence of the current battery explosion accidents, the safety of the battery is more and more emphasized at present. Batteries are typically mounted within sealed housings, and when a battery is out of control, particularly a chemical battery, is thermally out of control, a large amount of gas is typically emitted, the gas pressure within the sealed housing increases rapidly, and when the gas pressure within the sealed housing reaches a limit, a battery explosion event can occur.
The explosion-proof valve can be arranged on the sealing shell, the air pressure of the explosion-proof valve in the sealing shell reaches a certain value and is opened, and the air is discharged from the sealing shell, so that the air pressure rising rate in the sealing shell is slowed down or even not raised, and the time for the battery to reach explosion is delayed. However, how to set the number of the explosion-proof valves can improve the safety of the battery sealed housing on the basis of saving the cost of the explosion-proof valves, and no relevant description is provided, so that a need exists for determining the number of the explosion-proof valves mounted on the sealed housing.
Based on this, the embodiment of the present application provides an explosion-proof valve installation quantity determining method, which is applied to a battery pack, wherein the battery pack includes a plurality of battery cells, and the method includes: obtaining the gas leakage critical pressure value of the battery pack sealing shell, determining the gas production rate when the target electric core is in thermal runaway and the gas permeation rate of a single explosion-proof valve after being opened under the target pressure value, wherein the target pressure value is less than or equal to the gas leakage critical pressure value, determining the ratio of the gas production rate and the gas permeation rate as the installation number of the explosion-proof valves on the battery pack sealing shell, namely, when the target electric core is less than or equal to the gas leakage critical pressure value of the battery pack sealing shell, the explosion-proof valves are already opened, determining the gas production rate when the target electric core is in thermal runaway and the gas permeation rate of the single explosion-proof valve after being opened, determining the ratio of the gas production rate and the gas permeation rate as the installation number of the explosion-proof valves on the battery pack sealing shell, so that the installation number of the explosion-proof valves can meet the requirement of determining the installation number of the explosion-proof valves on the sealing shell, and the installation number can prolong the time of the battery pack to explode, the function of the explosion-proof valve can be realized at lower cost.
For a better understanding of the technical solutions and effects of the present application, specific embodiments will be described in detail below with reference to the accompanying drawings.
Referring to fig. 1, the figure is a flowchart of a method for determining the installation number of the explosion-proof valves according to an embodiment of the present application. The method for determining the installation quantity of the explosion-proof valves can be applied to battery packs, each battery pack comprises a plurality of modules, each module comprises a plurality of battery cells, and each battery cell comprises a positive electrode and a negative electrode. For example, a module may include 11 cells. The battery pack comprises a sealing shell for sealing a plurality of battery cells in the battery pack.
S101, obtaining a gas leakage critical pressure value of the battery pack sealing shell.
In the embodiment of the application, the critical pressure value of gas leakage is the pressure value that the sealed casing of battery package receives the battery package internal gas pressure extrusion and closes on gas leakage, can acquire the critical pressure value of gas leakage of the sealed casing of battery package.
Specifically, the minimum wall thickness value of the battery pack sealing shell can be selected, and Computer Aided Engineering (CAE) simulation calculation is performed by using the minimum wall thickness value to obtain the air leakage critical pressure value of the battery pack sealing shell.
The worst explosion state of the battery pack caused by the thinness of the battery pack sealing shell in practical application can be simulated by selecting the thinnest wall thickness value of the battery pack sealing shell, so that the performance of the explosion-proof valve after installation can be finally improved by the obtained calculation result.
Specifically, the upper case of the battery pack sealing case is weaker than the lower case of the battery pack sealing case, and therefore the thinnest wall thickness value of the battery pack sealing upper case can be selected as an input value of the simulation calculation.
As an example, the theoretical design wall thickness of the upper shell is 0.8 ± 0.08 millimeters (mm), and the worst possible upper shell case condition, i.e., the thinnest wall thickness of the upper shell of 0.72mm, can be selected as the input value for the simulation calculation.
In practical application, the thinnest wall thickness value of the battery pack sealing shell is input, pressure resistance simulation of the battery pack shell is sequentially carried out on the basis, deformation of the battery pack sealing shell under the air pressure in different battery packs can be obtained through simulation calculation, when the battery pack sealing shell reaches the maximum deformation, whether the compression rate of foam at the sealing position of the sealing shell under the maximum deformation can meet the compression rate of the sealing requirement is calculated, if the compression rate cannot meet the compression rate, the sealing shell has the risk of air leakage and fire leakage, and the air pressure in the battery pack corresponding to the maximum deformation is the air leakage critical pressure value.
In the embodiment of the application, after the air leakage critical pressure value of the battery pack sealed shell is determined, the maximum opening pressure value of the explosion-proof valve can be determined as the air leakage critical pressure value, that is, the explosion-proof valve is opened at the air leakage critical pressure value at the latest so as to ventilate, and the air pressure in the battery pack is reduced.
The lower the opening pressure of the explosion-proof valve is, the more the battery pack can be ventilated when the air pressure in the battery pack is lower, the thermal runaway in the battery pack can be further delayed, and the time for the battery pack to explode is delayed. Because the sealed casing of battery package need carry out the inflation pressure test to avoid the sealed casing of battery package to appear the gas leakage condition in practical application process. During the inflation pressure test, the other part in the battery pack sealing shell may be 2 kilopascal (kPa) -5kPa, and at this time, if the explosion-proof valve is already opened, the inflation pressure test cannot be performed on the battery pack sealing shell, so that the minimum value of the opening pressure of the explosion-proof valve at least meets the inflation pressure requirement, for example, the minimum value of the opening pressure of the explosion-proof valve is greater than 5 kPa.
In the embodiment of the application, the maximum value of the opening pressure of the explosion-proof valve can also be determined as the ratio of the gas leakage critical pressure value to the safety coefficient of the battery pack sealing shell, because when the electric core in the battery pack is out of control due to heat, the temperature of the battery pack sealing shell also rises along with the rise of the temperature, the rigidity of the shell is weakened, and the battery pack sealing shell possibly explodes when not reaching the gas leakage critical pressure value, so that the safety of the battery pack is further improved after the explosion-proof valve is installed, the maximum value of the opening pressure of the explosion-proof valve is determined as the ratio of the gas leakage critical pressure value to the safety coefficient of the battery pack sealing shell, the maximum value of the opening pressure of the explosion-proof valve can be further reduced, and the safety of the battery pack is further improved.
As an example, the critical pressure value of the air leakage of the battery pack sealing shell is 48 kilopascal (kPa), the safety factor of the battery pack sealing shell is 1.2, and the maximum opening pressure of the explosion-proof valve is 48/1.2 — 40 kPa. That is, the explosion-proof valve opens at the latest when the pressure of the sealed case of the battery pack reaches 40 kPa.
S102, determining the gas production rate when the target battery cell is in thermal runaway and the gas permeation rate of the single explosion-proof valve after the single explosion-proof valve is opened under the target pressure value.
In the embodiment of the application, when the battery cell in the battery pack is in a thermal runaway state, a large amount of gas can be generated, so that the gas pressure in the sealed shell of the battery pack rapidly rises, when a target pressure value is reached, the explosion-proof valve is opened, at the moment, the gas production rate of the target battery cell under the target pressure when the target battery cell is in the thermal runaway state and the gas permeation rate of the single explosion-proof valve under the target pressure can be determined, wherein the target pressure value is less than or equal to a gas leakage critical pressure value.
Under different pressures of the battery pack sealing shell, the gas production rate of the battery cell under thermal runaway and the gas permeation rate of the explosion-proof valve after opening may be different, so that the gas production rate and the gas permeation rate of the battery cell under different pressures can be respectively determined.
In the embodiment of this application, including a plurality of modules in the battery package, the thermal runaway design time of every module can not be less than the fixed value, that is to say, in order to prevent leading to the explosion of battery package immediately after the electric core thermal runaway in the battery package, require when the electric core of design battery package, reserve the thermal runaway reaction time of the module that every electric core or electric core constitute promptly, guarantee that the total time of the whole thermal runaway of electric core of a module is not less than the fixed value. For example, the fixed value may be 5 minutes (min) or 6min, and may be specifically set according to the safety regulations of the battery pack.
In the embodiment of the application, it can be determined that each module in the battery pack has several specific battery cells in thermal runaway according to the thermal runaway design time.
As a possible implementation manner, when the total time of the thermal runaway of the battery cells in the single module is longer than the thermal runaway design time, the battery cells in the single module may be in the thermal runaway in sequence, that is, the battery cells in the thermal runaway are the single battery cells, at this time, under the target pressure value, the target battery cells are the single battery cells, and at this time, the gas production rate of the target battery cells is the gas production rate of the single battery cells.
As another possible implementation manner, when the total time of the thermal runaway of the battery cells in the single module is shorter than the thermal runaway design time, the thermal runaway of the battery cells in the single module may be simultaneously performed, for example, the thermal runaway of the battery cells in the middle of the single module may affect the simultaneous thermal runaway of the battery cells around the single module.
Specifically, the number of the battery cells in each module can be determined to be out of control at the same time in the thermal control design time of the single module.
As an example, the thermal runaway of the cell in the middle portion may affect the cells on the adjacent left and right sides of the cell to be simultaneously thermally runaway, that is, the cell with the thermal runaway is 3 adjacent cells, at this time, at the target pressure value, the target cell is 3 adjacent cells, and at this time, the gas production rate of the target cell is the gas production rate of the 3 adjacent cells producing gas simultaneously.
In the embodiment of the application, the gas production rate can be the maximum gas production rate when the target battery core is in thermal runaway, so that the installation number of the explosion-proof valves calculated according to the maximum gas production rate can improve the safety of the battery pack, and a better explosion-proof effect is achieved.
And S103, determining the ratio of the gas production rate to the gas permeation rate as the installation number of the explosion-proof valves on the sealed shell of the battery pack.
In the embodiment of the application, under the condition that the target pressure value is obtained, after the gas generation rate when the target battery core is in thermal runaway and the ventilation rate of a single explosion-proof valve after the explosion-proof valve is opened, the ratio of the gas generation rate to the ventilation rate is determined as the installation number of the explosion-proof valve on the sealed shell of the battery pack.
That is, under the target pressure value, the explosion-proof valve is opened, and the total ventilation rate of the explosion-proof valve is at least greater than or equal to the gas generation rate when the target battery cell is in thermal runaway, so that the gas pressure in the battery pack sealing shell can be prevented from increasing continuously, and therefore, the ratio of the gas generation rate to the ventilation rate is the minimum value of the installation number of the explosion-proof valve on the battery pack sealing shell.
In practical application, if the ratio of the gas production rate to the gas permeation rate is not an integer, determining the integer with the smallest difference value from the integers larger than the ratio as the installation number of the explosion-proof valves on the battery pack sealing shell, that is, if the ratio of the gas production rate to the gas permeation rate is not an integer, taking the obtained ratio as an upward integer, and determining the integer as the installation number of the explosion-proof valves on the battery pack sealing shell.
As an example, the critical pressure value of the air leakage of the battery pack sealing shell is 48kPa, the safety factor is 1.2, the maximum opening pressure of the explosion-proof valve is 48/1.2-40 kPa, the thermal runaway design time is 6min, and the target pressure value is set as the maximum opening pressure of the explosion-proof valve of 40 kPa.
When the thermal runaway time of a single module is less than 6min, the target cell is represented as a single cell, that is, one cell generates gas at the same time, the gas generation rate is the maximum gas generation rate of the single cell under 40kPa, and is 198 liters per second (L/s) through a test, at this time, the gas permeation quantity of the single explosion-proof valve is 314L/s, the installation number of the explosion-proof valves on the battery pack sealing shell can be 198/314 ═ 0.63, and the installation number of the explosion-proof valves is rounded up to 1, so that the installation number of the explosion-proof valves is 1.
When the thermal runaway time of a single module is longer than 6min, the target cell is represented as 3 cells, that is, 3 cells are generating gas at the same time, the gas generation rate is the maximum gas generation rate of 3 cells under 40kPa, and is measured to be 3 × 198 to 594 liters per second (L/s), at this time, the gas permeation amount of a single explosion-proof valve is 314L/s, the installation number of the explosion-proof valves on the battery pack sealing shell can be 594/314 to 1.89, and the whole is taken up to 2, so the installation number of the explosion-proof valves is 2.
The method for determining the installation quantity of the explosion-proof valves is applied to a battery pack, wherein the battery pack comprises a plurality of battery cores, and the method comprises the following steps: obtaining the gas leakage critical pressure value of the battery pack sealing shell, determining the gas production rate when the target electric core is in thermal runaway and the gas permeation rate of a single explosion-proof valve after being opened under the target pressure value, wherein the target pressure value is less than or equal to the gas leakage critical pressure value, determining the ratio of the gas production rate and the gas permeation rate as the installation number of the explosion-proof valves on the battery pack sealing shell, namely, when the target electric core is less than or equal to the gas leakage critical pressure value of the battery pack sealing shell, the explosion-proof valves are already opened, determining the gas production rate when the target electric core is in thermal runaway and the gas permeation rate of the single explosion-proof valve after being opened, determining the ratio of the gas production rate and the gas permeation rate as the installation number of the explosion-proof valves on the battery pack sealing shell, so that the installation number of the explosion-proof valves can meet the requirement of determining the installation number of the explosion-proof valves on the sealing shell, and the installation number can prolong the time of the battery pack to explode, the function of the explosion-proof valve can be realized at lower cost.
Based on the method for determining the installation number of the explosion-proof valves provided by the above embodiment, the embodiment of the application also provides a device for determining the installation number of the explosion-proof valves, and the working principle of the device is described in detail below with reference to the attached drawings.
Referring to fig. 2, the figure is a schematic structural diagram of an installation quantity determining device for an explosion-proof valve according to an embodiment of the present application.
The explosion-proof valve installation quantity determining apparatus 200 provided in the embodiment of the present application includes:
an obtaining unit 210, configured to obtain a gas leakage critical pressure value of a battery pack sealed housing;
the first determining unit 220 is configured to determine a gas generation rate when the target battery cell is in thermal runaway and a gas permeation rate of the single explosion-proof valve after being opened at the target pressure value; the target pressure value is less than or equal to the air leakage critical pressure value;
a second determination unit 230 for determining the ratio of the gas generation rate and the gas permeation rate as the number of the explosion-proof valves mounted on the battery pack sealed housing.
Optionally, the target cell is a single cell, and the first determining unit 220 is configured to:
and determining the gas production rate when the single battery core is in thermal runaway and the gas permeation rate of the single explosion-proof valve after the single explosion-proof valve is opened under the target pressure value.
Optionally, the target cell is three adjacent cells, and the first determining unit 220 is configured to:
and determining the gas production rate when the adjacent three battery cells are simultaneously in thermal runaway and the gas permeation rate of the single explosion-proof valve after the single explosion-proof valve is opened under the target pressure value.
Optionally, the apparatus further comprises:
and the third determining unit is used for determining the maximum value of the opening pressure of the explosion-proof valve as the air leakage critical pressure value.
Optionally, the apparatus further comprises:
and the fourth determining unit is used for determining the maximum value of the opening pressure of the explosion-proof valve as the ratio of the air leakage critical pressure value to the safety coefficient of the battery pack sealing shell.
Optionally, the obtaining unit 210 is configured to:
selecting the thinnest wall thickness value of the battery pack sealing shell;
and carrying out simulation calculation by using the thinnest wall thickness value to obtain the air leakage critical pressure value of the battery pack sealing shell.
Optionally, the obtaining unit 210 is configured to:
and selecting the thinnest wall thickness value of the upper sealed shell of the battery pack.
Optionally, the gas production rate is a maximum gas production rate when the target cell is in thermal runaway.
Optionally, the second determining unit 230 is configured to:
and if the ratio of the gas production rate to the gas permeation rate is not an integer, determining the integer with the minimum difference value from the integers larger than the ratio as the installation number of the explosion-proof valves on the battery pack sealing shell.
When introducing elements of various embodiments of the present application, the articles "a," "an," "the," and "said" are intended to mean that there are one or more of the elements. The terms "comprising," "including," and "having" are intended to be inclusive and mean that there may be additional elements other than the listed elements.
It should be noted that, as one of ordinary skill in the art would understand, all or part of the processes of the above method embodiments may be implemented by a computer program to instruct related hardware, where the computer program may be stored in a computer readable storage medium, and when executed, the computer program may include the processes of the above method embodiments. The storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), or the like.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the apparatus embodiment, since it is substantially similar to the method embodiment, it is relatively simple to describe, and reference may be made to some descriptions of the method embodiment for relevant points. The above-described apparatus embodiments are merely illustrative, and the units and modules described as separate components may or may not be physically separate. In addition, some or all of the units and modules may be selected according to actual needs to achieve the purpose of the solution of the embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
The foregoing is merely a preferred embodiment of the present application and, although the present application discloses the foregoing preferred embodiments, the present application is not limited thereto. Those skilled in the art can now make numerous possible variations and modifications to the disclosed embodiments, or modify equivalent embodiments, using the methods and techniques disclosed above, without departing from the scope of the claimed embodiments. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present application still fall within the protection scope of the technical solution of the present application without departing from the content of the technical solution of the present application.
Claims (10)
1. An explosion-proof valve installation quantity determining method is applied to a battery pack, wherein the battery pack comprises a plurality of battery cells, and the method comprises the following steps:
acquiring a critical pressure value of air leakage of a battery pack sealing shell;
determining the gas production rate when the target battery cell is in thermal runaway and the gas permeation rate of a single explosion-proof valve after the single explosion-proof valve is opened under the target pressure value; the target pressure value is less than or equal to the air leakage critical pressure value;
and determining the ratio of the gas production rate to the gas permeation rate as the installation number of the explosion-proof valve on the battery pack sealing shell.
2. The method of claim 1, wherein the target cell is a single cell, and the determining the gas generation rate when the target cell is in thermal runaway and the gas permeation rate of the single explosion-proof valve after being opened at the target pressure value comprises:
and determining the gas production rate when the single battery core is in thermal runaway and the gas permeation rate of the single explosion-proof valve after the single explosion-proof valve is opened under the target pressure value.
3. The method of claim 1, wherein the target cell is three adjacent cells, and the determining the gas generation rate when the target cell is in thermal runaway and the gas permeation rate of the single explosion-proof valve after being opened at the target pressure value comprises:
and determining the gas production rate when the adjacent three battery cells are simultaneously in thermal runaway and the gas permeation rate of the single explosion-proof valve after the single explosion-proof valve is opened under the target pressure value.
4. The method of claim 1, further comprising:
and determining the maximum value of the opening pressure of the explosion-proof valve as the air leakage critical pressure value.
5. The method of claim 4, further comprising:
and determining the maximum value of the opening pressure of the explosion-proof valve as the ratio of the gas leakage critical pressure value to the safety coefficient of the battery pack sealed shell.
6. The method of claim 1, wherein obtaining a critical pressure value for air leakage of a sealed housing of a battery pack comprises:
selecting the thinnest wall thickness value of the battery pack sealing shell;
and carrying out simulation calculation by using the thinnest wall thickness value to obtain the air leakage critical pressure value of the battery pack sealing shell.
7. The method of claim 6, wherein selecting the thinnest wall thickness value of the battery pack sealing case comprises:
and selecting the thinnest wall thickness value of the upper sealed shell of the battery pack.
8. The method of any of claims 1-7, wherein the gas production rate is a maximum gas production rate at which the target cell is thermally runaway.
9. The method according to any one of claims 1-7, wherein the determining the ratio of the gas generation rate and the gas permeation rate as the number of the explosion-proof valves mounted on the battery pack sealing housing comprises:
and if the ratio of the gas production rate to the gas permeation rate is not an integer, determining the integer with the minimum difference value from the integers larger than the ratio as the installation number of the explosion-proof valves on the battery pack sealing shell.
10. An explosion-proof valve installation quantity determining apparatus, characterized in that the apparatus comprises:
the acquisition unit is used for acquiring the air leakage critical pressure value of the battery pack sealing shell;
the first determination unit is used for determining the gas production rate when the target battery cell is in thermal runaway and the gas permeation rate of a single explosion-proof valve after the single explosion-proof valve is opened under the target pressure value; the target pressure value is less than or equal to the air leakage critical pressure value;
and the second determination unit is used for determining the ratio of the gas generation rate and the gas permeation rate as the installation number of the explosion-proof valves on the battery pack sealing shell.
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