CN113532728B - Method and device for determining opening pressure value of explosion-proof valve in battery pack - Google Patents
Method and device for determining opening pressure value of explosion-proof valve in battery pack Download PDFInfo
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- CN113532728B CN113532728B CN202110774350.3A CN202110774350A CN113532728B CN 113532728 B CN113532728 B CN 113532728B CN 202110774350 A CN202110774350 A CN 202110774350A CN 113532728 B CN113532728 B CN 113532728B
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 239000004964 aerogel Substances 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
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- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L19/00—Details of, or accessories for, apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details or accessories are not special to particular types of pressure gauges
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
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- 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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Abstract
The embodiment of the invention provides a method and a device for determining a valve opening pressure value of an explosion-proof valve in a battery pack, wherein the battery pack comprises the explosion-proof valve, a heat insulation assembly and a plurality of battery cells, and the method comprises the following steps: performing a simulated working condition test on the battery pack to obtain first pressure values acquired for the plurality of battery cells in the simulated working condition test process; determining a second pressure value for the plurality of cells according to the pressure-bearing performance of the thermal insulation assembly; and determining a valve opening pressure value of the explosion-proof valve according to the first pressure value and the second pressure value, wherein the valve opening pressure value is used for controlling the explosion-proof valve to be opened when the pressure value of the battery pack reaches the valve opening pressure value. According to the embodiment of the invention, the pressure-bearing performance of the heat insulation pad is combined, and the opening pressure value of the explosion-proof valve is designed from the heat diffusion prevention layer of the battery pack.
Description
Technical Field
The invention relates to the technical field of battery packs, in particular to a method and a device for determining an opening pressure value of an explosion-proof valve in a battery pack.
Background
With the development of new energy automobiles worldwide, the conservation amount of the new energy automobiles is greatly increased. However, in recent years, a new energy automobile has been caused to get on fire due to thermal runaway of a power battery, and the new energy automobile using a lithium ion power battery as an energy storage device has been greatly affected.
The lithium ion power battery can generate gas expansion at high temperature. When the temperature of the battery cell rises, a series of side reaction gas production causes the pressure inside the battery cell to rise, when the internal pressure of the battery cell rises, but when the explosion-proof valve is not opened, the battery cell can extrude the heat insulation pad arranged between the battery cell and the battery cell when the battery pack is designed, when the internal pressure of the battery cell is higher, the heat insulation pad can be thinned, so that the heat insulation effect of the heat insulation pad is reduced, and the heat diffusion is easier to trigger.
At present, the design of the valve opening pressure value of the explosion-proof valve is generally considered from the system of electric core materials, design/manufacturing errors and the like, so that when the valve opening pressure value of the explosion-proof valve is designed to be too high, when a certain single electric core is subjected to thermal runaway, the thermal runaway of an adjacent electric core is more easily caused, and the thermal diffusion of a battery pack is caused, so that potential safety hazards of the battery are caused.
Disclosure of Invention
In view of the foregoing, it is proposed to provide a method and apparatus for determining a valve opening pressure value for an explosion proof valve in a battery pack that overcomes or at least partially solves the foregoing problems, comprising:
a method of determining a threshold pressure value for an explosion proof valve in a battery pack, the battery pack including the explosion proof valve, a thermal insulation assembly, and a plurality of cells, the method comprising:
performing a simulated working condition test on the battery pack to obtain first pressure values acquired for the plurality of battery cells in the simulated working condition test process;
determining a second pressure value for the plurality of cells according to the pressure-bearing performance of the thermal insulation assembly;
and determining a valve opening pressure value of the explosion-proof valve according to the first pressure value and the second pressure value, wherein the valve opening pressure value is used for controlling the explosion-proof valve to be opened when the pressure value of the battery pack reaches the valve opening pressure value.
Optionally, the determining the opening pressure value of the explosion-proof valve according to the first pressure value and the second pressure value includes:
judging whether the second pressure value is larger than the first pressure value or not;
when the second pressure value is larger than the first pressure value, determining an opening pressure value of the explosion-proof valve based on the second pressure value;
and determining the opening pressure value of the explosion-proof valve based on the first pressure value when the second pressure value is not larger than the first pressure value.
Optionally, the determining the opening pressure value of the explosion-proof valve based on the first pressure value includes:
determining a third pressure value for the explosion proof valve based on error parameters of the plurality of cells of the explosion proof valve;
and combining the third pressure value and the first pressure value to determine the opening pressure value of the explosion-proof valve.
Optionally, the method further comprises:
determining a difference between the second pressure value and the first pressure value when the second pressure value is greater than the first pressure value;
judging whether the third pressure value of the explosion-proof valve is smaller than the difference value between the second pressure value and the first pressure value;
and when the third pressure value is smaller than the difference value between the second pressure value and the first pressure value, the plurality of electric cells and/or the heat insulation assembly are adjusted.
Optionally, the determining a second pressure value for the plurality of cells according to the pressure bearing performance of the heat insulation assembly includes:
acquiring area parameters of the heat insulation assembly;
determining the pressure bearing performance of the heat insulation assembly;
and determining a second pressure value for the plurality of cells according to the area parameter and the pressure bearing performance.
Optionally, the determining the pressure bearing performance of the insulation assembly includes:
acquiring a corresponding relation between a thickness parameter and a temperature parameter of the heat insulation component;
determining the compression ratio of the heat insulation component at a preset temperature according to the corresponding relation between the thickness parameter and the temperature parameter;
and determining the pressure-bearing performance of the heat insulation assembly corresponding to the compression ratio.
A device for determining a threshold pressure value for an explosion proof valve in a battery pack, the battery pack including the explosion proof valve, a thermal insulation assembly, and a plurality of cells, the device comprising:
the first pressure value acquisition module is used for carrying out a simulated working condition test on the battery pack to obtain first pressure values acquired for the plurality of battery cells in the process of the simulated working condition test;
the second pressure value determining module is used for determining second pressure values for the plurality of electric cores according to the pressure-bearing performance of the heat insulation assembly;
the opening valve pressure value determining module is used for determining the opening valve pressure value of the explosion-proof valve according to the first pressure value and the second pressure value, and the opening valve pressure value is used for controlling the explosion-proof valve to be opened when the pressure value of the battery pack reaches the opening valve pressure value.
A battery pack comprising an explosion-proof valve, a thermal insulation assembly, and a plurality of cells, wherein the opening pressure value of the explosion-proof valve is determined according to the method described above.
A vehicle comprising a processor, a memory and a computer program stored on the memory and capable of running on the processor, which when executed by the processor implements the method of determining a valve opening pressure value for an explosion proof valve in a battery pack as described above.
A computer readable storage medium having stored thereon a computer program which when executed by a processor implements the method of determining a valve opening pressure value for an explosion proof valve in a battery pack as described above.
The embodiment of the invention has the following advantages:
according to the embodiment of the invention, the first pressure value which is acquired for the plurality of electric cores in the process of the simulated working condition test is obtained by carrying out the simulated working condition test on the battery pack, the second pressure value which is acquired for the plurality of electric cores can be determined according to the pressure bearing performance of the heat insulation assembly, and then the valve opening pressure value of the explosion-proof valve can be determined according to the first pressure value and the second pressure value, and the valve opening pressure value is used for controlling the explosion-proof valve to be opened when the pressure value of the battery pack reaches the valve opening pressure value, so that the pressure bearing performance of the heat insulation pad is combined, and the valve opening pressure value of the explosion-proof valve is designed from the heat diffusion prevention layer of the battery pack.
Drawings
In order to more clearly illustrate the technical solutions of the present invention, the drawings that are needed in the description of the present invention will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort to a person skilled in the art.
FIG. 1 is a flow chart of steps of a method for determining a valve opening pressure value for an explosion proof valve in a battery pack according to an embodiment of the present invention;
FIG. 2 is a flow chart illustrating steps of another method for determining a threshold pressure value for an explosion proof valve in a battery pack according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a device for determining an opening pressure value of an explosion-proof valve in a battery pack according to an embodiment of the present invention.
Detailed Description
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description. It will be apparent that the described embodiments are some, but not all, embodiments of the invention. 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.
One of the core concepts of the embodiment of the invention is that the simulated working condition test is carried out in the battery pack, the pressure value inside the current core is acquired, and then the opening pressure value of the explosion-proof valve can be designed by combining the pressure bearing performance of the heat insulation component, thereby effectively preventing the heat diffusion in the battery and improving the use safety of the vehicle.
It should be understood that the shape, electrodes, and output characteristics of the cell are not limiting of the embodiments of the invention. For example: the shape of the cell can be cylindrical, square, etc., the electrodes can be lithium, lead, etc., and the output characteristics include standard output terminal voltages, which can be 1.5V (Volt), 4.2V, etc.
The battery pack may provide electrical energy to a device electrically connected thereto, for example: the battery pack can be used as a power battery and arranged in a vehicle for providing electric energy for the vehicle. The embodiment of the invention improves the safety of providing electric energy for the vehicle by the battery pack, and further improves the use safety of the vehicle.
Referring to fig. 1, a step flow chart of a method for determining a valve opening pressure value of an explosion-proof valve in a battery pack according to an embodiment of the present invention is shown, where the battery pack includes the explosion-proof valve, a heat insulation component, and a plurality of electric cores, where the electric cores may be electrically connected in series and/or parallel, and for the plurality of electric cores, an explosion-proof valve matched with the electric cores may be provided, and when the air pressure in the electric core reaches a certain value, the explosion-proof valve is automatically opened and transfers the air in the electric core to the outside of the electric core so as to perform pressure relief, thereby improving the safety of the electric core.
The embodiment of the invention specifically comprises the following steps:
because the cell can be under the high temperature condition (100 ℃ for example) inside production gas, form the inside atmospheric pressure of cell to, can place atmospheric pressure detection device in the inside of cell, atmospheric pressure detection device can be used for detecting the inside atmospheric pressure of cell, thereby through the atmospheric pressure of gathering, design explosion-proof valve's opening valve pressure value, effectively ensure the safety of battery package.
It should be noted that, the air pressure detecting device in the embodiment of the present invention may be a high-precision air pressure sensor, or the type of the air pressure detecting device may be determined according to an actual application scenario, and the type of the air pressure detecting device is not limited herein.
In practical application, can carry out simulation operating mode test or other acceleration tests (simulation operating mode test and other acceleration tests can represent battery life cycle) to the battery package, a plurality of electric cores generate gas production gas in the in-process of simulation operating mode test, gas production gas in the electric core can form different internal pressures in the electric core, can gather the pressure value of a plurality of electric cores through air pressure detection device, and then can confirm first pressure value according to the pressure value who gathers.
For example, the collected pressure values are ranked by pressure value size, and a maximum pressure value of the plurality of pressure values is determined as a first pressure value.
102, determining a second pressure value for the plurality of electric cores according to the pressure bearing performance of the heat insulation assembly;
in the battery pack, the battery core can generate heat in the practical application process, and a certain heat insulation effect can be achieved by arranging the heat insulation component between the battery core and the battery core.
It should be noted that, in the embodiment of the present invention, the heat insulation component may be aerogel, or other materials that may be used for heat insulation of the battery cell may be selected according to the actual situation of the battery cell, which is not limited herein by the specific type of the heat insulation component.
Because the heat insulation component generally has certain ductility, when a plurality of electric cores meet high-temperature internal gas production to form air pressure, the heat insulation component between the electric cores can be extruded, and the heat insulation component can be compressed or stretched under different pressure values so as to deform, and then, under the condition that the heat insulation component deforms, the heat insulation performance of the heat insulation component can change, and the heat diffusion between the electric cores can be caused.
In order to prevent thermal diffusion among the multiple battery cells, the pressure-bearing performance of the heat insulation assembly can be determined, namely, in the process of producing gas by the battery cells and extruding the heat insulation assembly, the heat insulation assembly can bear the capacity of extruding the battery cells under the condition that the heat insulation assembly is ensured to have preset heat insulation performance.
After determining the pressure bearing performance of the heat insulation assembly, further, a second pressure value of the extruded battery cell can be reversely analyzed according to the pressure bearing performance of the heat insulation assembly.
In an example, the battery pack may be a battery pack within a vehicle or a battery pack connected to a vehicle.
The steps 101 and 102 are parallel steps, and the order is not distinguished.
And step 103, determining a valve opening pressure value of the explosion-proof valve according to the first pressure value and the second pressure value, wherein the valve opening pressure value is used for controlling the explosion-proof valve to be opened when the pressure value of the battery pack reaches the valve opening pressure value.
After the first pressure value and the second pressure value are obtained, the first pressure value is obtained according to the gas production condition of the battery cell, the second pressure value is obtained according to the performance of the heat insulation component under the condition of considering the thermal diffusion of the battery cell, and the first pressure value and the second pressure value are combined to design the opening pressure value of the explosion-proof valve.
In practical application, when the pressure value of the battery pack reaches the valve opening pressure value, the explosion-proof valve can be controlled to be opened to relieve the pressure of the battery pack, so that thermal diffusion between the battery cells is avoided when the pressure of the battery pack is overlarge, the accident rate of the battery pack and the battery cells is reduced, and the safety of the battery pack and the battery cells is improved.
In one example, the explosion valve opening pressure design is mainly combined with the full life cycle gas production, expansion, internal volume change, design/manufacturing tolerances, etc. of the battery cell, and is not combined with the module and the battery pack layer for comprehensive design.
For example, the valve opening pressure center value of a common aluminum shell power cell explosion-proof valve is 0.9MPa, the valve opening pressure center value is only considered from the cell layer surface during design, and is not comprehensively designed by combining with a battery pack, and in practical application, the valve opening pressure value can be applied to cells with different systems, different shapes and the like, so that the valve opening pressure value of the explosion-proof valve is not reasonable only according to the cell layer surface.
In the battery pack, when the design of the opening valve pressure value of the battery cell explosion-proof valve is too high, when a certain single battery cell is in thermal runaway, the thermal runaway of the adjacent battery cell is more easily caused, so that the thermal diffusion of the battery pack is caused. Meanwhile, based on the current practical technical levels of cell materials, design, manufacture and the like, certain gas can be generated in the normal use process of the cell to cause the internal pressure to rise, so that the opening valve pressure value of the cell explosion-proof valve cannot be designed to be too small.
Therefore, considering the safety problem of the battery pack and the battery core, the design thought of the opening pressure value of the explosion-proof valve needs to be innovated, and comprehensive consideration needs to be carried out from the aspects of the module and the battery pack.
The first pressure value and the second pressure value obtained by carrying out reverse analysis on the battery pack layer are obtained through the influence factors required to be considered by the battery cell, and meanwhile, the second pressure value and the battery pack are comprehensively designed to obtain a more reasonable valve opening pressure value of the explosion-proof valve, so that the design requirement of the battery pack for preventing heat diffusion is more facilitated.
In the embodiment of the invention, the first pressure values acquired for the plurality of electric cores in the process of the simulated working condition test are obtained by carrying out the simulated working condition test on the battery pack, the second pressure values for the plurality of electric cores can be determined according to the pressure bearing performance of the heat insulation assembly, and then the valve opening pressure value of the explosion-proof valve can be determined according to the first pressure values and the second pressure values, and the valve opening pressure value is used for controlling the explosion-proof valve to be opened when the pressure value of the battery pack reaches the valve opening pressure value, so that the valve opening pressure value of the explosion-proof valve is designed from the heat-proof diffusion layer of the battery pack in combination with the pressure bearing performance of the heat insulation pad.
Referring to fig. 2, a flowchart illustrating another method for determining a valve opening pressure value of an explosion-proof valve in a battery pack according to an embodiment of the present invention may specifically include the following steps:
in one embodiment of the present invention, step 202 includes:
a substep 21 of obtaining an area parameter of the thermal insulation assembly;
the area parameter of the insulation assembly may include the area of the entire insulation assembly, the contact area of the insulation assembly with the cells, etc.
A substep 22 of determining the pressure-bearing capacity of said insulating assembly;
in one embodiment of the present invention, sub-step 22 may include:
acquiring a corresponding relation between a thickness parameter and a temperature parameter of the heat insulation component; determining the compression ratio of the heat insulation component at a preset temperature according to the corresponding relation between the thickness parameter and the temperature parameter; and determining the pressure-bearing performance of the heat insulation assembly corresponding to the compression ratio.
In practical application, the thickness of the heat insulation component is different at different temperatures, and the thickness parameter of the heat insulation component has a corresponding relation with the temperature parameter. By acquiring the corresponding relation between the thickness parameter and the temperature parameter, the minimum thickness of the heat insulation assembly at the preset temperature (such as 100 ℃ at high temperature) can be determined, wherein the minimum thickness is the compression rate of the heat insulation assembly at the preset temperature, and then the highest pressure bearable by the heat insulation assembly at the compression rate, namely the pressure bearing performance of the heat insulation assembly, can be calculated.
And a substep 23, determining a second pressure value for the plurality of electric cells according to the area parameter and the pressure bearing performance.
after the first pressure value and the second pressure value are obtained, the magnitudes of the first pressure value and the second pressure value can be compared, so that the opening pressure value of the explosion-proof valve is determined according to the magnitude relation between the first pressure value and the second pressure value
Step 204, when the second pressure value is greater than the first pressure value, determining a valve opening pressure value of the explosion-proof valve based on the second pressure value;
when the design of the cell explosion-proof valve opening valve pressure value is too high, when a certain single cell is subjected to thermal runaway, the thermal runaway of an adjacent cell is more easily caused, so that the thermal diffusion of a battery pack is caused.
When the second pressure value is larger than the first pressure value, from the aspect of preventing heat diffusion, when the opening pressure value of the explosion-proof valve is smaller than the second pressure value, heat diffusion between the battery cells can be effectively prevented, and therefore the opening pressure value of the explosion-proof valve can be determined based on the second pressure value.
In an example, the opening pressure value of the explosion-proof valve may be a pressure value within a range of the interval, and when the second pressure value is greater than the first pressure value, the second pressure value may be set to a maximum design value of the opening pressure value of the explosion-proof valve to effectively prevent heat diffusion.
Step 205, determining a valve opening pressure value of the explosion-proof valve based on the first pressure value when the second pressure value is not greater than the first pressure value.
And certain gas can be generated in the normal use process of the battery cell to cause the internal pressure to rise, so that the opening valve pressure value of the explosion-proof valve cannot be designed to be too small.
When the second pressure value is larger than the first pressure value, the second pressure value is smaller at this time, if the opening pressure value of the explosion-proof valve is continuously set according to the second pressure value, the explosion-proof valve begins to release pressure when the battery pack pressure value reaches the second pressure value in the normal use process of the battery core, and in order to prevent the explosion-proof valve from automatically opening in the use process of the battery core, the opening pressure value of the explosion-proof valve can be determined based on the first pressure value.
In an embodiment of the present invention, step 205 may include:
a substep 11 of determining a third pressure value for the explosion-proof valve based on error parameters of the plurality of cells of the explosion-proof valve when the second pressure value is not greater than the first pressure value;
in practical application, when the second pressure value is greater than the first pressure value, the first error parameters of the explosion-proof valve and the first error parameters of the plurality of electric cores can be obtained, so that a third pressure value for the explosion-proof valve is determined by combining the first error parameters and the second error parameters, wherein the third pressure value is a redundant pressure value reflecting errors of the explosion-proof valve and the electric cores in practical application.
The first error parameter can be determined according to the design and manufacture of the explosion-proof valve, and the second error parameter can be determined according to the design and manufacture of the battery cell, the use condition of the battery cell and the like.
And a substep 12, combining the third pressure value and the first pressure value to determine a valve opening pressure value of the explosion-proof valve.
The valve opening pressure value of the explosion-proof valve can be a pressure value in a range of a section, after the third pressure value is determined, the sum of the third pressure value and the first pressure value can be taken as the minimum design value of the valve opening pressure value in consideration of the error between the explosion-proof valve and the battery cell, so that the automatic valve opening in the use process of the battery cell is prevented.
A step 206 of determining a difference between the second pressure value and the first pressure value when the second pressure value is greater than the first pressure value;
by combining the first pressure value and the third pressure value, the explosion-proof valve can be prevented from automatically opening in the use process of the battery cell, so that when the second pressure value is larger than the first pressure value, the second pressure value is used as the maximum design value of the opening pressure value for preventing heat diffusion, and at the moment, the difference value between the second pressure value and the first pressure value can be further calculated for preventing the explosion-proof valve from automatically opening in the use process of the battery cell.
comparing the difference value with the third pressure value, it can be understood that whether the difference value between the second pressure value and the first pressure value is larger than the third pressure value is judged, so as to determine whether the risk of automatic valve opening of the explosion-proof valve exists in the use process of the battery cell when the second pressure value is used as the maximum design value of the valve opening pressure value.
And step 208, adjusting the plurality of electric cells and/or the heat insulation assembly when the third pressure value is smaller than the difference value between the second pressure value and the first pressure value.
When the third pressure value is smaller than the difference value between the second pressure value and the first pressure value, the risk of automatic valve opening of the explosion-proof valve possibly exists in the use process of the battery cell, so that a plurality of battery cells and/or heat insulation components can be adjusted to improve the gas yield (reduce the first pressure value) or strengthen the heat insulation measures of the battery pack (improve the second pressure value) in the use process of the battery cell, and the third pressure value is larger than or equal to the difference value between the second pressure value and the first pressure value after adjustment, so that the risk of automatic valve opening of the explosion-proof valve in the use process of the battery cell is avoided.
In the embodiment of the invention, the opening pressure value of the explosion-proof valve is reasonably designed by comparing the first pressure value with the second pressure value and setting the opening pressure value of the explosion-proof valve by combining the third pressure value according to different comparison results, so that the safety of the battery pack and the battery core is improved.
It should be noted that, for simplicity of description, the method embodiments are shown as a series of acts, but it should be understood by those skilled in the art that the embodiments are not limited by the order of acts, as some steps may occur in other orders or concurrently in accordance with the embodiments. Further, those skilled in the art will appreciate that the embodiments described in the specification are presently preferred embodiments, and that the acts are not necessarily required by the embodiments of the invention.
Referring to fig. 3, a schematic structural diagram of a device for determining an opening pressure value of an explosion-proof valve in a battery pack according to an embodiment of the present invention is shown, where the battery pack includes the explosion-proof valve, a heat insulation assembly, and a plurality of battery cells, and may specifically include the following modules:
the first pressure value acquisition module 301 is configured to perform a simulated condition test on the battery pack, and obtain first pressure values acquired for the plurality of battery cells in the process of the simulated condition test;
a second pressure value determining module 302, configured to determine a second pressure value for the plurality of electrical cells according to the pressure bearing performance of the thermal insulation assembly;
the valve opening pressure value determining module 303 is configured to determine a valve opening pressure value of the explosion-proof valve according to the first pressure value and the second pressure value, where the valve opening pressure value is used to control the explosion-proof valve to open when the pressure value of the battery pack reaches the valve opening pressure value.
In one embodiment of the present invention, the opening pressure value determining module 303 may include:
the first judging submodule is used for judging whether the second pressure value is larger than the first pressure value or not;
the first valve opening pressure value design submodule is used for determining a valve opening pressure value of the explosion-proof valve based on the second pressure value when the second pressure value is larger than the first pressure value;
and the second valve opening pressure value design submodule is used for determining the valve opening pressure value of the explosion-proof valve based on the first pressure value when the second pressure value is not larger than the first pressure value.
In one embodiment of the present invention, the second open-valve pressure value design sub-module may include:
a pressure error determination unit configured to determine a third pressure value for the explosion-proof valve based on error parameters of the plurality of cells of the explosion-proof valve;
and the opening valve pressure value design determining unit is used for combining the third pressure value and the first pressure value to determine the opening valve pressure value of the explosion-proof valve.
In one embodiment of the present invention, the opening pressure value determining module 303 may include:
a pressure difference calculation sub-module for determining a difference between the second pressure value and the first pressure value when the second pressure value is greater than the first pressure value;
the second judging submodule is used for judging whether the third pressure value of the explosion-proof valve is smaller than the difference value between the second pressure value and the first pressure value;
and the adjusting sub-module is used for adjusting the plurality of electric cores and/or the heat insulation assembly when the third pressure value is smaller than the difference value between the second pressure value and the first pressure value.
In one embodiment of the invention, the second pressure value determination module 302 may include:
an area parameter obtaining sub-module for obtaining the area parameter of the heat insulation component;
the pressure-bearing performance determining submodule is used for determining the pressure-bearing performance of the heat insulation assembly;
and the second pressure value determining submodule is used for determining second pressure values for the plurality of battery cells according to the area parameter and the pressure bearing performance.
In one embodiment of the present invention, the pressure bearing performance determining sub-module may include:
the corresponding relation acquisition unit is used for acquiring the corresponding relation between the thickness parameter and the temperature parameter of the heat insulation component;
the compression ratio determining unit is used for determining the compression ratio of the heat insulation component at a preset temperature according to the corresponding relation between the thickness parameter and the temperature parameter;
and the pressure-bearing performance unit is used for determining the pressure-bearing performance of the heat insulation assembly corresponding to the compression rate.
In the embodiment of the invention, the first pressure values acquired for the plurality of electric cores in the process of the simulated working condition test are obtained by carrying out the simulated working condition test on the battery pack, the second pressure values for the plurality of electric cores can be determined according to the pressure bearing performance of the heat insulation assembly, and then the valve opening pressure value of the explosion-proof valve can be determined according to the first pressure values and the second pressure values, and the valve opening pressure value is used for controlling the explosion-proof valve to be opened when the pressure value of the battery pack reaches the valve opening pressure value, so that the valve opening pressure value of the explosion-proof valve is designed from the heat-proof diffusion layer of the battery pack in combination with the pressure bearing performance of the heat insulation pad.
The embodiment of the invention also discloses a battery pack, which comprises an explosion-proof valve, a heat insulation assembly and a plurality of battery cores, wherein the valve opening pressure value of the explosion-proof valve is determined according to the embodiment of the method for determining the valve opening pressure value of the explosion-proof valve in the battery pack.
An embodiment of the present invention further provides a vehicle, which may include a processor, a memory, and a computer program stored on the memory and capable of running on the processor, where the computer program when executed by the processor implements the above method for determining the opening pressure value of the explosion-proof valve in the battery pack.
An embodiment of the present invention further provides a computer readable storage medium, on which a computer program is stored, which when executed by a processor implements the above method for determining a valve opening pressure value for an explosion-proof valve in a battery pack.
For the device embodiments, since they are substantially similar to the method embodiments, the description is relatively simple, and reference is made to the description of the method embodiments for relevant points.
In this specification, each embodiment is described in a progressive manner, and each embodiment is mainly described by differences from other embodiments, and identical and similar parts between the embodiments are all enough to be referred to each other.
It will be apparent to those skilled in the art that embodiments of the present invention may be provided as a method, apparatus, or computer program product. Accordingly, embodiments of the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, embodiments of the invention may take the form of a computer program product on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) having computer-usable program code embodied therein.
Embodiments of the present invention are described with reference to flowchart illustrations and/or block diagrams of methods, terminal devices (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing terminal device to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing terminal device, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiment and all such alterations and modifications as fall within the scope of the embodiments of the invention.
Finally, it is further noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or terminal that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or terminal. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article or terminal device comprising the element.
The foregoing has described in detail a method and apparatus for determining a valve opening pressure value for an explosion-proof valve in a battery pack, and specific examples have been set forth herein to illustrate the principles and embodiments of the present invention, the above examples being provided only to assist in understanding the method and core concepts of the present invention; meanwhile, as those skilled in the art will have variations in the specific embodiments and application scope in accordance with the ideas of the present invention, the present description should not be construed as limiting the present invention in view of the above.
Claims (9)
1. A method of determining a threshold opening pressure value for an explosion proof valve in a battery pack, the battery pack comprising the explosion proof valve, a thermal insulation assembly, and a plurality of cells, the method comprising:
performing a simulated working condition test on the battery pack to obtain first pressure values acquired for the plurality of battery cells in the simulated working condition test process;
determining a second pressure value for the plurality of cells according to the pressure-bearing performance of the thermal insulation assembly;
determining a valve opening pressure value of the explosion-proof valve according to the first pressure value and the second pressure value, wherein the valve opening pressure value is used for controlling the explosion-proof valve to be opened when the pressure value of the battery pack reaches the valve opening pressure value;
wherein, the determining the valve opening pressure value of the explosion-proof valve according to the first pressure value and the second pressure value includes:
judging whether the second pressure value is larger than the first pressure value or not;
determining a valve opening pressure value of the explosion-proof valve based on the second pressure value when the second pressure value is greater than the first pressure value;
and determining the opening pressure value of the explosion-proof valve based on the first pressure value when the second pressure value is not larger than the first pressure value.
2. The method of claim 1, wherein the determining the opening pressure value of the explosion proof valve based on the first pressure value comprises:
determining a third pressure value for the explosion proof valve based on error parameters of the plurality of cells of the explosion proof valve;
and combining the third pressure value and the first pressure value to determine the opening pressure value of the explosion-proof valve.
3. The method as recited in claim 2, further comprising:
determining a difference between the second pressure value and the first pressure value when the second pressure value is greater than the first pressure value;
judging whether the third pressure value of the explosion-proof valve is smaller than the difference value between the second pressure value and the first pressure value;
and when the third pressure value is smaller than the difference value between the second pressure value and the first pressure value, the plurality of electric cells and/or the heat insulation assembly are adjusted.
4. A method according to claim 1, 2 or 3, wherein said determining a second pressure value for said plurality of cells based on pressure bearing properties of said insulation assembly comprises:
acquiring area parameters of the heat insulation assembly;
determining the pressure bearing performance of the heat insulation assembly;
and determining a second pressure value for the plurality of cells according to the area parameter and the pressure bearing performance.
5. The method of claim 4, wherein said determining the pressure bearing performance of said insulation assembly comprises:
acquiring a corresponding relation between a thickness parameter and a temperature parameter of the heat insulation component;
determining the compression ratio of the heat insulation component at a preset temperature according to the corresponding relation between the thickness parameter and the temperature parameter;
and determining the pressure-bearing performance of the heat insulation assembly corresponding to the compression ratio.
6. A device for determining a threshold pressure value for an explosion proof valve in a battery pack, the battery pack comprising the explosion proof valve, a thermal insulation assembly, and a plurality of cells, the device comprising:
the first pressure value acquisition module is used for carrying out a simulated working condition test on the battery pack to obtain first pressure values acquired for the plurality of battery cells in the process of the simulated working condition test;
the second pressure value determining module is used for determining second pressure values for the plurality of electric cores according to the pressure-bearing performance of the heat insulation assembly;
the opening valve pressure value determining module is used for determining an opening valve pressure value of the explosion-proof valve according to the first pressure value and the second pressure value, and the opening valve pressure value is used for controlling the explosion-proof valve to be opened when the pressure value of the battery pack reaches the opening valve pressure value;
wherein, the valve opening pressure value determination module includes:
the first judging submodule is used for judging whether the second pressure value is larger than the first pressure value or not;
the first valve opening pressure value design submodule is used for determining a valve opening pressure value of the explosion-proof valve based on the second pressure value when the second pressure value is larger than the first pressure value;
and the second valve opening pressure value design submodule is used for determining the valve opening pressure value of the explosion-proof valve based on the first pressure value when the second pressure value is not larger than the first pressure value.
7. A battery pack comprising an explosion-proof valve, a thermal insulation assembly, and a plurality of cells, wherein the opening pressure value of the explosion-proof valve is determined according to the method of any one of claims 1-5.
8. A vehicle comprising a processor, a memory and a computer program stored on the memory and executable on the processor, the computer program when executed by the processor implementing the method of determining a valve opening pressure value for an explosion proof valve in a battery pack as claimed in any one of claims 1 to 5.
9. A computer-readable storage medium, on which a computer program is stored, which computer program, when being executed by a processor, implements the method for determining the opening pressure value for an explosion-proof valve in a battery pack according to any one of claims 1 to 5.
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| CN103792144A (en) * | 2014-01-24 | 2014-05-14 | 曙鹏科技（深圳）有限公司 | Method for detecting opening pressures of batteries |
| CN104390774A (en) * | 2014-12-09 | 2015-03-04 | 深圳市豪鹏科技有限公司 | Method and device for testing high-temperature opening pressure of anti-explosion valve of secondary battery |
| CN206496894U (en) * | 2017-01-06 | 2017-09-15 | 山东衡远新能源科技有限公司 | A kind of battery pressure limiting cover plate explosion-proof valve air pressure test system |
| CN207007487U (en) * | 2017-07-06 | 2018-02-13 | 北京康斯特仪表科技股份有限公司 | Detect the detector for safety valve of the Opening pressure of safety valve |
| CN108109206B (en) * | 2017-12-18 | 2021-05-25 | 中航锂电技术研究院有限公司 | Finite element modeling method for opening pressure of lithium battery safety valve |
| CN211980738U (en) * | 2020-05-27 | 2020-11-20 | 蜂巢能源科技有限公司 | Battery pack explosion-proof valve and battery pack with same |
| CN213466577U (en) * | 2020-07-24 | 2021-06-18 | 比亚迪股份有限公司 | Heat exchange plate, battery box and vehicle |
| CN112924161A (en) * | 2021-02-18 | 2021-06-08 | 湖北亿纬动力有限公司 | Pressure detection device for opening valve of explosion-proof valve |
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