CN113505481B - Method and device for determining shell seal failure pressure and electronic equipment - Google Patents
Method and device for determining shell seal failure pressure and electronic equipment Download PDFInfo
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- CN113505481B CN113505481B CN202110771661.4A CN202110771661A CN113505481B CN 113505481 B CN113505481 B CN 113505481B CN 202110771661 A CN202110771661 A CN 202110771661A CN 113505481 B CN113505481 B CN 113505481B
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
- G06F2119/14—Force analysis or force optimisation, e.g. static or dynamic forces
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y02E60/10—Energy storage using batteries
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Abstract
The invention provides a method and a device for determining a shell seal failure pressure and electronic equipment, wherein the method comprises the following steps: when a simulation model is adopted to simulate the working condition of increasing the internal pressure of the battery pack, determining a first corresponding relation between the deformation of the sealing surface of the upper shell of the battery pack and the internal pressure of the battery pack; determining a compression ratio calculation formula of the sealing gasket according to the minimum thickness, the minimum compression amount and the first corresponding relation of the sealing gasket; determining a pressure calculation formula of the sealing gasket according to the compression ratio calculation formula of the sealing gasket and a second corresponding relation between the compression ratio of the sealing gasket and the pressure of the sealing gasket; and establishing an equation relation between the pressure calculation formula of the sealing gasket and the internal pressure of the battery pack, further calculating the internal pressure of the battery pack, and taking the calculated internal pressure of the battery pack as the shell sealing failure pressure. The method can accurately determine the shell seal failure pressure, and the burst opening pressure of the selected explosion-proof valve is more proper when the explosion-proof valve is selected according to the shell seal failure pressure.
Description
Technical Field
The present invention relates to the field of battery technologies, and in particular, to a method and an apparatus for determining a failure pressure of a casing seal, and an electronic device.
Background
With the rapid development of new energy automobiles, especially the development of pure electric automobiles, the safety performance of a battery pack has become an important index for measuring the safety performance of the whole new energy automobile. The battery pack is subjected to gas exchange with external gas pressure through the explosion-proof valve, so that the internal and external gas pressures of the battery pack are kept balanced (for example, when the battery core fails, excessive gas is discharged into the battery pack, the gas in the battery pack is suddenly increased, the gas can be discharged through the explosion-proof valve, and open fire can not be generated outside the battery pack), and therefore, the installation of the explosion-proof valve is particularly important for the safety performance of the battery pack. When the explosion-proof valve is installed, the explosion-proof valve with proper explosion opening pressure needs to be selected, because if the explosion opening pressure of the explosion-proof valve is too small, when the battery pack vibrates, the upper cover of the battery pack has displacement in the Z direction, the explosion-proof valve can be opened in the vibration process, and the protection level of the explosion-proof valve can be invalid; if the explosion opening pressure of the explosion-proof valve is too large, after the battery core fails and excessive high-temperature gas is discharged into the battery pack, the explosion-proof valve cannot be opened, the internal pressure of the battery pack is continuously increased, when the internal pressure of the battery pack is larger than the pressure of a sealing gasket between an upper shell and a lower shell of the battery pack, the sealing gasket can be broken through by the high-temperature gas, and a large amount of high-temperature gas easily causes open fire outside the battery pack to bring danger. Therefore, in making the selection of the explosion-proof valve, the explosion-opening pressure of the explosion-proof valve needs to be considered, and the explosion-opening pressure of the explosion-proof valve mainly depends on the seal failure pressure of the battery pack case (i.e., the critical pressure when the gasket is broken).
However, the prior art has not been able to determine the seal failure pressure of the housing, resulting in relatively blindness in making the selection of the explosion proof valve.
Disclosure of Invention
In view of the above, the present invention aims to provide a method, a device and an electronic device for determining a seal failure pressure of a housing, so as to solve the technical problem that the prior art cannot determine the seal failure pressure of the housing, resulting in blindness in selection of an explosion-proof valve.
In a first aspect, an embodiment of the present invention provides a method for determining a failure pressure of a seal of a housing, including:
when a simulation model is adopted to simulate the working condition of increasing the internal pressure of the battery pack, determining a first corresponding relation between the deformation of the sealing surface of the upper shell of the battery pack and the internal pressure of the battery pack;
determining a minimum thickness and a minimum compression amount of a gasket of a battery pack, and determining a compression ratio formula of the gasket according to the minimum thickness, the minimum compression amount and the first corresponding relation, wherein the compression ratio formula of the gasket is a function of internal pressure of the battery pack;
acquiring a second corresponding relation between the compression rate of the sealing gasket and the pressure of the sealing gasket, and determining a pressure calculation formula of the sealing gasket according to the compression rate calculation formula of the sealing gasket and the second corresponding relation, wherein the pressure calculation formula of the sealing gasket is a function of the internal pressure of the battery pack;
and establishing an equation relation between the pressure calculation formula of the sealing gasket and the internal pressure of the battery pack, further calculating the internal pressure of the battery pack, and taking the calculated internal pressure of the battery pack as the shell sealing failure pressure.
Further, before the operation condition that the internal pressure of the battery pack is increased is simulated by adopting the simulation model, the method further comprises the following steps:
establishing a geometric model of the battery pack in three-dimensional software according to the part sizes of all parts in the battery pack in a limit state, wherein the part sizes of all the parts in the limit state comprise: the upper tolerance is taken out from the limit height of the rivet nut, and the upper shell thickness is taken out from the tolerance;
and loading the geometric model of the battery pack to simulation software to obtain the simulation model.
Further, determining a first correspondence between an amount of deformation of an upper housing sealing surface of a battery pack and an internal pressure of the battery pack, includes:
when a simulation model is adopted to simulate the working condition of increasing the internal pressure of the battery pack, acquiring a relation curve between the deformation of the sealing surface of the upper shell and the internal pressure of the battery pack;
and determining the first corresponding relation according to the relation curve.
Further, determining a minimum thickness and a minimum compression of a gasket of a battery pack includes:
acquiring information of the thickness of the sealing gasket, information of the limit height of the rivet nut and the permanent deformation of the sealing gasket after aging, wherein the information of the thickness of the sealing gasket comprises: the thickness of the sealing gasket and the corresponding tolerance are included in the information of the limit height of the rivet nut: the limit height and the corresponding tolerance of the rivet nut;
determining the minimum thickness according to the value of the thickness taking-down tolerance of the sealing gasket and the permanent deformation of the sealing gasket after aging;
and determining the minimum compression amount according to the value of the thickness taking-down tolerance of the sealing gasket, the value of the upper tolerance of the limit height of the rivet nut and the permanent deformation amount of the aged sealing gasket.
Further, the compression ratio of the sealing gasket is as follows: (the minimum compression amount-the deformation amount of the upper case seal surface)/the minimum thickness, wherein the deformation amount of the upper case seal surface is a function of the internal pressure of the battery pack determined according to the first correspondence relationship.
Further, determining a pressure equation of the gasket according to the compression rate equation of the gasket and the second correspondence relation includes:
and replacing the compression ratio of the sealing gasket in the second corresponding relation by adopting the compression ratio calculation formula of the sealing gasket to obtain the pressure calculation formula of the sealing gasket.
Further, after the housing seal failure pressure is obtained, the method further comprises:
calculating the explosion opening pressure of the explosion-proof valve according to the shell seal failure pressure;
and selecting a target explosion-proof valve corresponding to the explosion opening pressure according to the calculated explosion opening pressure.
In a second aspect, an embodiment of the present invention further provides a device for determining a failure pressure of a seal of a housing, including:
the first determining unit is used for determining a first corresponding relation between the deformation of the sealing surface of the upper shell of the battery pack and the internal pressure of the battery pack when the working condition that the internal pressure of the battery pack is increased is simulated by adopting a simulation model;
a second determining unit configured to determine a minimum thickness and a minimum compression amount of a gasket of a battery pack, and determine a compression ratio equation of the gasket according to the minimum thickness, the minimum compression amount, and the first correspondence, wherein the compression ratio equation of the gasket is a function of an internal pressure of the battery pack;
a third determining unit, configured to obtain a second correspondence between a compression rate of the gasket and a pressure thereof, and determine a pressure equation of the gasket according to the compression rate equation of the gasket and the second correspondence, where the pressure equation of the gasket is a function of an internal pressure of the battery pack;
and the calculating unit is used for establishing an equation relation between the pressure formula of the sealing gasket and the internal pressure of the battery pack, further calculating the internal pressure of the battery pack, and taking the calculated internal pressure of the battery pack as the sealing failure pressure of the shell.
In a third aspect, an embodiment of the present invention further provides an electronic device, including a memory, a processor, and a computer program stored on the memory and executable on the processor, where the processor implements the steps of the method according to any one of the first aspects when the processor executes the computer program.
In a fourth aspect, embodiments of the present invention also provide a computer-readable storage medium storing machine-executable instructions which, when invoked and executed by a processor, cause the processor to perform the method of any one of the first aspects.
In an embodiment of the invention, a method for determining a failure pressure of a seal of a housing is provided, including: when a simulation model is adopted to simulate the working condition of increasing the internal pressure of the battery pack, determining a first corresponding relation between the deformation of the sealing surface of the upper shell of the battery pack and the internal pressure of the battery pack; determining the minimum thickness and the minimum compression amount of the sealing gasket of the battery pack, and determining a compression ratio calculation formula of the sealing gasket according to the minimum thickness, the minimum compression amount and the first corresponding relation; acquiring a second corresponding relation between the compression rate of the sealing gasket and the pressure of the sealing gasket, and determining a pressure calculation formula of the sealing gasket according to the compression rate calculation formula of the sealing gasket and the second corresponding relation; and establishing an equation relation between the pressure calculation formula of the sealing gasket and the internal pressure of the battery pack, further calculating the internal pressure of the battery pack, and taking the calculated internal pressure of the battery pack as the shell sealing failure pressure. According to the method for determining the shell seal failure pressure, the shell seal failure pressure can be accurately determined, the explosion opening pressure of the selected explosion-proof valve is more proper when the explosion-proof valve is selected according to the shell seal failure pressure, and the safety of a battery pack can be improved when the explosion-proof valve with the proper explosion opening pressure is applied to the battery pack, so that the technical problem that the prior art cannot determine the shell seal failure pressure and blindness is caused when the explosion-proof valve is selected is solved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a method for determining a seal failure pressure of a housing according to an embodiment of the present invention;
fig. 2 is a schematic view of a battery pack case structure according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a device for determining a failure pressure of a seal of a housing according to an embodiment of the present invention;
fig. 4 is a schematic diagram of an electronic device according to an embodiment of the present invention.
Detailed Description
The technical solutions of the present invention will be clearly and completely described in connection with the embodiments, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
At present, the prior art cannot calculate the shell sealing failure pressure of the battery pack, so that the selection of the explosion-proof valve is blind, and the safety performance of the battery pack is affected.
Based on this, the embodiment provides a method for determining the casing seal failure pressure, which can accurately determine the casing seal failure pressure, and subsequently, when the explosion-proof valve is selected according to the casing seal failure pressure, the explosion-proof valve is selected to have a more appropriate explosion-proof opening pressure, and when the explosion-proof valve with the appropriate explosion-proof opening pressure is applied to the battery pack, the safety of the battery pack can be improved.
For the convenience of understanding the present embodiment, a method for determining the failure pressure of a seal of a housing according to an embodiment of the present invention will be described in detail.
Embodiment one:
in accordance with an embodiment of the present invention, there is provided an embodiment of a method of determining a housing seal failure pressure, it being noted that the steps illustrated in the flowchart of the figures may be performed in a computer system, such as a set of computer executable instructions, and, although a logical sequence is illustrated in the flowchart, in some cases, the steps illustrated or described may be performed in a different order than that illustrated herein.
FIG. 1 is a flow chart of a method of determining a housing seal failure pressure according to an embodiment of the invention, as shown in FIG. 1, the method comprising the steps of:
step S102, when a working condition that the internal pressure of the battery pack is increased is simulated by adopting a simulation model, determining a first corresponding relation between the deformation of the sealing surface of the upper shell of the battery pack and the internal pressure of the battery pack;
the simulation model is a simulation model constructed in simulation software, and the simulation model is a model verified to pass according to an actual state value of the battery pack, and the actual state value may include: the actual value of the thickness of the upper shell, the actual value of the limit height of the rivet nut and the actual value of the thickness of the sealing gasket.
Fig. 2 is a schematic view showing the structure of the battery pack case, and as can be seen from fig. 2, the gasket is compressed by bolts, and after a case where a cell failure (i.e., thermal runaway) occurs, the internal pressure (P Air flow ) Increase, if P Air flow ＜P Sealing gasket The position of the sealing gasket is not leaked, and the sealing failure of the shell is not generated; if P Air flow ＞P Sealing gasket The pressure of the sealing gasket cannot bear the pressure in the battery pack, the sealing gasket is damaged and leaks, namely the phenomenon of shell sealing failure is generated, so that when P Air flow ＝P Sealing gasket At this time, the calculated internal pressure (P Air flow ) The critical pressure value of the shell seal failure is the shell seal failure pressure to be determined in the invention.
The working condition of the internal pressure increase of the battery pack can be specifically that: full restraint is applied to all bolt holes of the upper casing of the battery pack, and uniform pressure is applied to the inner side of the upper casing. The above-mentioned full constraint applied to all bolt holes of the upper case of the battery pack means that the positions of the bolt holes on the upper case are fixed, equivalent to tightening the upper case to the lower case, and uniform pressure applied to the inner side of the upper case is equivalent to uniform application of gas to the upper case surface when thermal runaway occurs.
When the simulation of the working conditions is performed, a first corresponding relation between the deformation amount of the upper shell sealing surface of the battery pack and the internal pressure of the battery pack can be determined, and the process is described in detail hereinafter and is not described in detail herein.
Step S104, determining the minimum thickness and the minimum compression amount of the sealing gasket of the battery pack, and determining a compression ratio calculation formula of the sealing gasket according to the minimum thickness, the minimum compression amount and the first corresponding relation, wherein the compression ratio calculation formula of the sealing gasket is a function of the internal pressure of the battery pack;
the minimum thickness and the minimum compression amount are values obtained when each part in the battery pack is in a limit state (may also be called a worst state), that is, when the pull rivet nut is positioned at a limit height and the gasket thickness is positioned at a lower limit, the minimum thickness and the minimum compression amount are determined, and the minimum compression amount of the gasket is considered to be larger in the limit state, and the corresponding gasket pressure is smaller, so that the gasket pressure (P Air flow ＝P Sealing gasket ) The determined shell seal failure pressure is relatively smaller, and then the explosion opening pressure of the explosion-proof valve determined according to the relatively smaller shell seal failure pressure is also relatively smaller, so that when thermal runaway occurs, the selected explosion-proof valve with the relatively smaller explosion opening pressure can be opened in time, and is safer.
The following details of the process of step S104 are not described herein.
Step S106, obtaining a second corresponding relation between the compression rate of the sealing gasket and the pressure of the sealing gasket, and determining a pressure calculation formula of the sealing gasket according to the compression rate calculation formula of the sealing gasket and the second corresponding relation, wherein the pressure calculation formula of the sealing gasket is a function of the internal pressure of the battery pack;
the second correspondence between the compression ratio of the gasket and the pressure thereof is known, and can be determined as long as the type of the gasket is determined.
Step S108, establishing an equation relation between the pressure formula of the sealing gasket and the internal pressure of the battery pack, further calculating the internal pressure of the battery pack, and taking the calculated internal pressure of the battery pack as the shell seal failure pressure.
In an embodiment of the invention, a method for determining a failure pressure of a seal of a housing is provided, including: when a simulation model is adopted to simulate the working condition of increasing the internal pressure of the battery pack, determining a first corresponding relation between the deformation of the sealing surface of the upper shell of the battery pack and the internal pressure of the battery pack; determining the minimum thickness and the minimum compression amount of the sealing gasket of the battery pack, and determining a compression ratio calculation formula of the sealing gasket according to the minimum thickness, the minimum compression amount and the first corresponding relation; acquiring a second corresponding relation between the compression rate of the sealing gasket and the pressure of the sealing gasket, and determining a pressure calculation formula of the sealing gasket according to the compression rate calculation formula of the sealing gasket and the second corresponding relation; and establishing an equation relation between the pressure calculation formula of the sealing gasket and the internal pressure of the battery pack, further calculating the internal pressure of the battery pack, and taking the calculated internal pressure of the battery pack as the shell sealing failure pressure. According to the method for determining the shell seal failure pressure, the shell seal failure pressure can be accurately determined, the explosion opening pressure of the selected explosion-proof valve is more proper when the explosion-proof valve is selected according to the shell seal failure pressure, and the safety of a battery pack can be improved when the explosion-proof valve with the proper explosion opening pressure is applied to the battery pack, so that the technical problem that the prior art cannot determine the shell seal failure pressure and blindness is caused when the explosion-proof valve is selected is solved.
The foregoing briefly describes a method of determining the seal failure pressure of a housing of the present invention, and the details of which are set forth herein below.
In an alternative embodiment of the present invention, before the operation of simulating the increase of the internal pressure of the battery pack using the simulation model, the method further includes: establishing a geometric model of the battery pack in three-dimensional software according to the sizes of parts in the battery pack when the parts are in a limit state, wherein the sizes of the parts in the limit state comprise: the upper tolerance is taken out from the limit height of the rivet nut, and the upper shell thickness is taken out from the tolerance; and loading the geometric model of the battery pack into simulation software to obtain a simulation model.
The simulation software may be CAE simulation software.
In an alternative embodiment of the present invention, determining a first correspondence between an amount of deformation of an upper housing sealing surface of a battery pack and an internal pressure of the battery pack includes: when a simulation model is adopted to simulate the working condition of increasing the internal pressure of the battery pack, acquiring a relation curve between the deformation of the sealing surface of the upper shell and the internal pressure of the battery pack; and determining a first corresponding relation according to the relation curve.
Specifically, under the working condition that the internal pressure of the simulated battery pack is increased, the simulation software outputs a relation curve between the deformation of the sealing surface of the upper shell and the internal pressure of the battery pack, and the relation curve is fitted to obtain a first corresponding relation. The first correspondence may be noted as: t=f 1 (P Air flow ) Wherein t represents deformation of the sealing surface of the upper shell, and P Air flow Indicating the internal pressure of the battery pack.
In an alternative embodiment of the present invention, determining the minimum thickness and the minimum compression of the gasket of the battery pack includes the steps of:
(1) Acquiring information of the thickness of the sealing gasket, information of the limit height of the rivet nut and the permanent deformation of the sealing gasket after aging, wherein the information of the thickness of the sealing gasket comprises: the thickness of the sealing gasket and the corresponding tolerance are included in the information of the limit height of the rivet nut: the limit height and the corresponding tolerance of the rivet nut;
the following is a specific example:
| project | Tolerance of |
| Thickness of gasket | 5±0.4mm |
| Spacing height of rivet nut | 2.5±0.3mm |
| Permanent deformation of gasket after aging | 0.5mm |
(2) Determining the minimum thickness according to the value of the thickness taking-down tolerance of the sealing gasket and the permanent deformation of the sealing gasket after aging;
specifically, taking down the tolerance of the thickness of the sealing gasket, and obtaining a value which is different from the permanent deformation of the sealing gasket after aging so as to obtain the minimum thickness;
as in the example of (1) above, the minimum thickness can be obtained as: 4.6-0.5=4.1 mm.
(3) And determining the minimum compression amount according to the value of the thickness taking-down tolerance of the sealing gasket, the value of the upper tolerance of the limit height of the rivet nut and the permanent deformation amount of the aged sealing gasket.
Specifically, the thickness of the sealing gasket is taken down to obtain a first value, the limit height of the rivet nut is taken up to obtain a second value, and the first value, the second value and the permanent deformation of the sealing gasket after ageing are subjected to difference simultaneously to obtain the minimum compression quantity.
As in the example of (1) above, the minimum compression amount can be obtained as: 4.6-2.8-0.5=1.3 mm.
In an alternative embodiment of the present invention, the compression ratio formula of the gasket is determined according to the minimum thickness, the minimum compression amount, and the first correspondence, where the determined compression ratio formula is: (minimum compression amount-deformation amount of the upper case sealing surface)/minimum thickness, wherein the deformation amount of the upper case sealing surface is a function of the internal pressure of the battery pack determined according to the first correspondence relationship.
As in the example of (1) above and the first correspondence t=f 1 (P Air flow ) It can be seen that the compression ratio of the determined gasket is calculated as: (1.3-f) 1 (P Air flow ))/4.1. The minimum compression of the sealing gasket minus the deformation of the sealing surface of the upper shell is the actual compression of the sealing gasket, and then divided by the minimum thickness of the sealing gasket to obtain the compression rate.
In an alternative embodiment of the present invention, determining the pressure equation of the gasket from the compression ratio equation of the gasket and the second correspondence relation includes: and replacing the compression ratio of the sealing gasket in the second corresponding relation by adopting the compression ratio of the sealing gasket to obtain a pressure calculation formula of the sealing gasket.
The compression ratio calculation formula of the sealing gasket is substituted into the second corresponding relation to obtain the pressure calculation formula of the sealing gasket.
Specifically, the second correspondence relationship is: p (P) Sealing gasket ＝f 2 (compression ratio), wherein P Sealing gasket The pressure of the gasket is expressed, and the compression ratio of the gasket is expressed by the formula (1.3-f 1 (P Air flow ) Substitution into the second correspondence, the pressure equation of the obtained gasket is: p (P) Sealing gasket ＝f2[(1.3-f 1 (P Air flow ))/4.1]。
Finally, an equality relationship between the pressure calculation formula of the gasket and the internal pressure of the battery pack is established (the reason for establishing the equality relationship has been explained in the content of step S102), that is, the equality relationship is: f (f) 2 [(1.3-f 1 (P Air flow ))/4.1]＝P Air flow Due to two functions f 1 And f 2 Are known, so that the internal pressure of the battery pack can be obtained by solving the internal pressure of the battery pack as a shellBody seal failure pressure.
In an alternative embodiment of the invention, after obtaining the housing seal failure pressure, the method further comprises: calculating the explosion opening pressure of the explosion-proof valve according to the shell seal failure pressure; and selecting a target explosion-proof valve corresponding to the explosion opening pressure according to the calculated explosion opening pressure.
Typically, burst open pressure = 0.8 x housing seal failure pressure. For example: the case seal failure pressure is 40KPa, then the burst open pressure is 32KPa, so that the final selected target explosion proof valve burst open pressure is 32KPa.
It should be noted that: the simulation model is a model which is verified to pass according to the actual state value of the battery pack, and the verification process is described below:
the method comprises the steps of firstly obtaining the actual state value of the battery pack, including: the method comprises the steps that an actual value of the thickness of an upper shell, an actual value of the limiting height of a rivet nut and an actual value of the thickness of a sealing gasket are established in three-dimensional software according to an obtained actual state value, and then the battery pack geometric model is loaded to simulation software to obtain an initial simulation model; simulating the working condition of increasing the internal pressure of the battery pack by adopting the initial simulation model to obtain a first corresponding relation between the deformation of the sealing surface of the upper shell of the battery pack output by the initial simulation model and the internal pressure of the battery pack; determining an actual value of a gasket thickness and an actual value of a gasket compression amount of the battery pack, and determining a compression ratio formula of the gasket according to the actual value of the gasket thickness, the actual value of the gasket compression amount and the first correspondence (similar to the specific content of claim 1 of the present invention, reference may be made to the related description about claim 1); and then, obtaining a second corresponding relation between the compression rate of the sealing gasket and the pressure of the sealing gasket, substituting the compression rate of the sealing gasket into the second corresponding relation to determine a pressure formula of the sealing gasket, finally, establishing an equality relation between the pressure formula of the sealing gasket and the internal pressure of the battery pack, solving the equality relation, and taking the internal pressure of the battery pack obtained by solving as the shell sealing failure pressure.
After the shell seal failure pressure is obtained, packing a sealing gasket of a real object into a bag, continuously inflating the bag into the shell, determining shell seal failure (indicating that the shell leaks air) when the internal pressure of the shell is not increased along with the inflation process, taking the inflation pressure at the moment as the shell seal failure pressure measured by a test, and finally comparing the shell seal failure pressure measured by the test with the shell seal failure pressure obtained by the simulation calculation, if the two are the same, indicating that an initial simulation model is accurate, and verifying that the initial simulation model is a simulation model passing verification; if the two parameters are different, the parameters of the initial simulation model are corrected, and verification is performed again until the verification is passed.
The reason why the case seal failure pressure under the limit condition is calculated by the simulation calculation method is that if the case seal failure pressure under the limit condition is measured through the test, it is necessary that each part in the real battery pack reaches the limit condition, but it is difficult for the battery pack to satisfy the limit condition, so the simulation calculation method is adopted.
Embodiment two:
the embodiment of the invention also provides a device for determining the shell seal failure pressure, which is mainly used for executing the method for determining the shell seal failure pressure provided in the first embodiment of the invention, and the device for determining the shell seal failure pressure provided in the embodiment of the invention is specifically described below.
FIG. 3 is a schematic view of a device for determining the failure pressure of a seal of a housing according to an embodiment of the present invention, as shown in FIG. 3, the device mainly includes: a first determination unit 10, a second determination unit 20, a third determination unit 30, and a calculation unit 40, wherein:
the first determining unit is used for determining a first corresponding relation between the deformation of the sealing surface of the upper shell of the battery pack and the internal pressure of the battery pack when the working condition that the internal pressure of the battery pack is increased is simulated by adopting a simulation model;
a second determining unit for determining a minimum thickness and a minimum compression amount of a gasket of the battery pack, and determining a compression ratio formula of the gasket according to the minimum thickness, the minimum compression amount, and the first correspondence, wherein the compression ratio formula of the gasket is a function of an internal pressure of the battery pack;
a third determining unit, configured to obtain a second correspondence between the compression rate of the gasket and the pressure thereof, and determine a pressure equation of the gasket according to the compression rate equation of the gasket and the second correspondence, where the pressure equation of the gasket is a function of the internal pressure of the battery pack;
and the calculating unit is used for establishing an equation relation between the pressure formula of the sealing gasket and the internal pressure of the battery pack, further calculating the internal pressure of the battery pack, and taking the calculated internal pressure of the battery pack as the shell sealing failure pressure.
In an embodiment of the present invention, there is provided a device for determining a failure pressure of a seal of a housing, including: when a simulation model is adopted to simulate the working condition of increasing the internal pressure of the battery pack, determining a first corresponding relation between the deformation of the sealing surface of the upper shell of the battery pack and the internal pressure of the battery pack; determining the minimum thickness and the minimum compression amount of the sealing gasket of the battery pack, and determining a compression ratio calculation formula of the sealing gasket according to the minimum thickness, the minimum compression amount and the first corresponding relation; acquiring a second corresponding relation between the compression rate of the sealing gasket and the pressure of the sealing gasket, and determining a pressure calculation formula of the sealing gasket according to the compression rate calculation formula of the sealing gasket and the second corresponding relation; and establishing an equation relation between the pressure calculation formula of the sealing gasket and the internal pressure of the battery pack, further calculating the internal pressure of the battery pack, and taking the calculated internal pressure of the battery pack as the shell sealing failure pressure. According to the device for determining the shell seal failure pressure, disclosed by the invention, the shell seal failure pressure can be accurately determined, the explosion opening pressure of the selected explosion-proof valve is more proper when the explosion-proof valve is selected according to the shell seal failure pressure, and the safety of a battery pack can be improved when the explosion-proof valve with the proper explosion opening pressure is applied to the battery pack, so that the technical problem that the prior art cannot determine the shell seal failure pressure and blindness is caused when the explosion-proof valve is selected is solved.
Optionally, the device is further configured to: establishing a geometric model of the battery pack in three-dimensional software according to the sizes of parts in the battery pack when the parts are in a limit state, wherein the sizes of the parts in the limit state comprise: the upper tolerance is taken out from the limit height of the rivet nut, and the upper shell thickness is taken out from the tolerance; and loading the geometric model of the battery pack into simulation software to obtain a simulation model.
Optionally, the first determining unit is further configured to: when a simulation model is adopted to simulate the working condition of increasing the internal pressure of the battery pack, acquiring a relation curve between the deformation of the sealing surface of the upper shell and the internal pressure of the battery pack; and determining a first corresponding relation according to the relation curve.
Optionally, the second determining unit is further configured to: acquiring information of the thickness of the sealing gasket, information of the limit height of the rivet nut and the permanent deformation of the sealing gasket after aging, wherein the information of the thickness of the sealing gasket comprises: the thickness of the sealing gasket and the corresponding tolerance are included in the information of the limit height of the rivet nut: the limit height and the corresponding tolerance of the rivet nut; determining the minimum thickness according to the value of the thickness taking-down tolerance of the sealing gasket and the permanent deformation of the sealing gasket after aging; and determining the minimum compression amount according to the value of the thickness taking-down tolerance of the sealing gasket, the value of the upper tolerance of the limit height of the rivet nut and the permanent deformation amount of the aged sealing gasket.
Optionally, the compression ratio of the gasket is calculated as: (minimum compression amount-deformation amount of the upper case sealing surface)/minimum thickness, wherein the deformation amount of the upper case sealing surface is a function of the internal pressure of the battery pack determined according to the first correspondence relationship.
Optionally, the third determining unit is further configured to: and replacing the compression ratio of the sealing gasket in the second corresponding relation by adopting the compression ratio of the sealing gasket to obtain a pressure calculation formula of the sealing gasket.
Optionally, the device is further configured to: calculating the explosion opening pressure of the explosion-proof valve according to the shell seal failure pressure; and selecting a target explosion-proof valve corresponding to the explosion opening pressure according to the calculated explosion opening pressure.
The device provided by the embodiment of the present invention has the same implementation principle and technical effects as those of the foregoing method embodiment, and for the sake of brevity, reference may be made to the corresponding content in the foregoing method embodiment where the device embodiment is not mentioned.
As shown in fig. 4, an electronic device 600 provided in an embodiment of the present application includes: the device comprises a processor 601, a memory 602 and a bus, wherein the memory 602 stores machine-readable instructions executable by the processor 601, the processor 601 and the memory 602 communicate through the bus when the electronic device is running, and the processor 601 executes the machine-readable instructions to perform the steps of the method for determining the failure pressure of the shell seal as described above.
Specifically, the above-mentioned memory 602 and the processor 601 can be general-purpose memories and processors, and are not particularly limited herein, and the above-mentioned method of determining the case seal failure pressure can be performed when the processor 601 runs a computer program stored in the memory 602.
The processor 601 may be an integrated circuit chip with signal processing capabilities. In implementation, the steps of the above method may be performed by integrated logic circuits of hardware in the processor 601 or instructions in the form of software. The processor 601 may be a general-purpose processor, including a central processing unit (Central Processing Unit, CPU for short), a network processor (Network Processor, NP for short), etc.; but may also be a digital signal processor (Digital Signal Processing, DSP for short), application specific integrated circuit (Application Specific Integrated Circuit, ASIC for short), off-the-shelf programmable gate array (Field-Programmable Gate Array, FPGA for short), or other programmable logic device, discrete gate or transistor logic device, discrete hardware components. The disclosed methods, steps, and logic blocks in the embodiments of the present application may be implemented or performed. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of a method disclosed in connection with the embodiments of the present application may be embodied directly in hardware, in a decoded processor, or in a combination of hardware and software modules in a decoded processor. The software modules may be located in a random access memory, flash memory, read only memory, programmable read only memory, or electrically erasable programmable memory, registers, etc. as well known in the art. The storage medium is located in a memory 602, and the processor 601 reads information in the memory 602 and performs the steps of the above method in combination with its hardware.
Corresponding to the above method for determining a shell seal failure pressure, the embodiments of the present application further provide a computer readable storage medium storing machine executable instructions that, when invoked and executed by a processor, cause the processor to execute the steps of the above method for determining a shell seal failure pressure.
The device for determining the failure pressure of the shell seal provided by the embodiment of the application can be specific hardware on equipment or software or firmware installed on the equipment. The device provided in the embodiments of the present application has the same implementation principle and technical effects as those of the foregoing method embodiments, and for a brief description, reference may be made to corresponding matters in the foregoing method embodiments where the device embodiment section is not mentioned. It will be clear to those skilled in the art that, for convenience and brevity, the specific operation of the system, apparatus and unit described above may refer to the corresponding process in the above method embodiment, which is not described in detail herein.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other manners. The above-described apparatus embodiments are merely illustrative, for example, the division of the units is merely a logical function division, and there may be other manners of division in actual implementation, and for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be through some communication interface, device or unit indirect coupling or communication connection, which may be in electrical, mechanical or other form.
As another example, the flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of apparatus, methods and computer program products according to various embodiments of the present application. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional unit in the embodiments provided in the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit.
The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer-readable storage medium. Based on such understanding, the technical solution of the present application may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution, in the form of a software product stored in a storage medium, comprising several instructions for causing an electronic device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the vehicle marking method according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
It should be noted that: like reference numerals and letters in the following figures denote like items, and thus once an item is defined in one figure, no further definition or explanation of it is required in the following figures, and furthermore, the terms "first," "second," "third," etc. are used merely to distinguish one description from another and are not to be construed as indicating or implying relative importance.
Finally, it should be noted that: the foregoing examples are merely specific embodiments of the present application, and are not intended to limit the scope of the present application, but the present application is not limited thereto, and those skilled in the art will appreciate that while the foregoing examples are described in detail, the present application is not limited thereto. Any person skilled in the art may modify or easily conceive of the technical solution described in the foregoing embodiments, or make equivalent substitutions for some of the technical features within the technical scope of the disclosure of the present application; such modifications, changes or substitutions do not depart from the spirit of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application. Are intended to be encompassed within the scope of this application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (10)
1. A method of determining a housing seal failure pressure, comprising:
when a simulation model is adopted to simulate the working condition of increasing the internal pressure of the battery pack, determining a first corresponding relation between the deformation of the sealing surface of the upper shell of the battery pack and the internal pressure of the battery pack;
determining a minimum thickness and a minimum compression amount of a gasket of a battery pack, and determining a compression ratio formula of the gasket according to the minimum thickness, the minimum compression amount and the first corresponding relation, wherein the compression ratio formula of the gasket is a function of internal pressure of the battery pack;
acquiring a second corresponding relation between the compression rate of the sealing gasket and the pressure of the sealing gasket, and determining a pressure calculation formula of the sealing gasket according to the compression rate calculation formula of the sealing gasket and the second corresponding relation, wherein the pressure calculation formula of the sealing gasket is a function of the internal pressure of the battery pack;
and establishing an equation relation between the pressure calculation formula of the sealing gasket and the internal pressure of the battery pack, further calculating the internal pressure of the battery pack, and taking the calculated internal pressure of the battery pack as the shell sealing failure pressure.
2. The method of claim 1, wherein prior to simulating the conditions of increased internal pressure of the battery pack using the simulation model, the method further comprises:
establishing a geometric model of the battery pack in three-dimensional software according to the part sizes of all parts in the battery pack in a limit state, wherein the part sizes of all the parts in the limit state comprise: the upper tolerance is taken out from the limit height of the rivet nut, and the upper shell thickness is taken out from the tolerance;
and loading the geometric model of the battery pack to simulation software to obtain the simulation model.
3. The method of claim 1, wherein determining a first correspondence between an amount of deformation of an upper housing sealing surface of a battery pack and an internal pressure of the battery pack comprises:
when a simulation model is adopted to simulate the working condition of increasing the internal pressure of the battery pack, acquiring a relation curve between the deformation of the sealing surface of the upper shell and the internal pressure of the battery pack;
and determining the first corresponding relation according to the relation curve.
4. The method of claim 1, wherein determining a minimum thickness and a minimum compression of a gasket of a battery pack comprises:
acquiring information of the thickness of the sealing gasket, information of the limit height of the rivet nut and the permanent deformation of the sealing gasket after aging, wherein the information of the thickness of the sealing gasket comprises: the thickness of the sealing gasket and the corresponding tolerance are included in the information of the limit height of the rivet nut: the limit height and the corresponding tolerance of the rivet nut;
determining the minimum thickness according to the value of the thickness taking-down tolerance of the sealing gasket and the permanent deformation of the sealing gasket after aging;
and determining the minimum compression amount according to the value of the thickness taking-down tolerance of the sealing gasket, the value of the upper tolerance of the limit height of the rivet nut and the permanent deformation amount of the aged sealing gasket.
5. The method of claim 1, wherein the compression ratio of the gasket is calculated as: (the minimum compression amount-the deformation amount of the upper case seal surface)/the minimum thickness, wherein the deformation amount of the upper case seal surface is a function of the internal pressure of the battery pack determined according to the first correspondence relationship.
6. The method of claim 1, wherein determining the pressure equation for the gasket based on the compression ratio equation for the gasket and the second correspondence comprises:
and replacing the compression ratio of the sealing gasket in the second corresponding relation by adopting the compression ratio calculation formula of the sealing gasket to obtain the pressure calculation formula of the sealing gasket.
7. The method of claim 1, wherein after obtaining the housing seal failure pressure, the method further comprises:
calculating the explosion opening pressure of the explosion-proof valve according to the shell seal failure pressure;
and selecting a target explosion-proof valve corresponding to the explosion opening pressure according to the calculated explosion opening pressure.
8. A device for determining a seal failure pressure of a housing, comprising:
the first determining unit is used for determining a first corresponding relation between the deformation of the sealing surface of the upper shell of the battery pack and the internal pressure of the battery pack when the working condition that the internal pressure of the battery pack is increased is simulated by adopting a simulation model;
a second determining unit configured to determine a minimum thickness and a minimum compression amount of a gasket of a battery pack, and determine a compression ratio equation of the gasket according to the minimum thickness, the minimum compression amount, and the first correspondence, wherein the compression ratio equation of the gasket is a function of an internal pressure of the battery pack;
a third determining unit, configured to obtain a second correspondence between a compression rate of the gasket and a pressure thereof, and determine a pressure equation of the gasket according to the compression rate equation of the gasket and the second correspondence, where the pressure equation of the gasket is a function of an internal pressure of the battery pack;
and the calculating unit is used for establishing an equation relation between the pressure formula of the sealing gasket and the internal pressure of the battery pack, further calculating the internal pressure of the battery pack, and taking the calculated internal pressure of the battery pack as the sealing failure pressure of the shell.
9. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor implements the steps of the method of any of the preceding claims 1 to 7 when the computer program is executed.
10. A computer readable storage medium storing machine executable instructions which, when invoked and executed by a processor, cause the processor to perform the method of any one of the preceding claims 1 to 7.
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| CN110414117B (en) * | 2019-07-23 | 2020-11-06 | 北京航空航天大学 | Method for predicting sealing reliability of soft package lithium ion battery |
| CN114171810B (en) * | 2021-12-03 | 2024-10-11 | 珠海迈巨微电子有限责任公司 | Battery monitoring method and device based on battery deformation detection and electronic equipment |
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