CN114235084A - Method and device for testing gas production of battery - Google Patents
Method and device for testing gas production of battery Download PDFInfo
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- CN114235084A CN114235084A CN202111480146.7A CN202111480146A CN114235084A CN 114235084 A CN114235084 A CN 114235084A CN 202111480146 A CN202111480146 A CN 202111480146A CN 114235084 A CN114235084 A CN 114235084A
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- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F22/00—Methods or apparatus for measuring volume of fluids or fluent solid material, not otherwise provided for
- G01F22/02—Methods or apparatus for measuring volume of fluids or fluent solid material, not otherwise provided for involving measurement of pressure
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Abstract
The invention discloses a method and a device for testing gas production of a battery. Wherein, the method comprises the following steps: determining the volume change of the closed container, wherein a target battery is placed in the closed container, and the volume change is the volume change value of the closed container before and after the explosion-proof valve of the target battery is punctured; determining a volume of space occupied by internal gas of the target cell; and determining the gas production of the target battery according to the volume change and the space volume. The invention solves the technical problem that the internal pressure can be tested but the gas quantity cannot be measured in the related technology.
Description
Technical Field
The invention relates to the field of lithium ion power batteries, in particular to a method and a device for testing gas production of a battery.
Background
In the service process of the lithium ion aluminum shell power battery, gas can be generated due to the internal side reaction. When the gas production is large, the following hazards will exist: firstly, lithium precipitation is easily caused, capacity fading is accelerated, and the service life is shortened; secondly, the battery bulges, so that the failure risk of the module structure is increased; and thirdly, the risk of opening the explosion-proof valve is increased. Therefore, it is necessary to study the gas production behavior of the battery and establish a gas production risk evaluation model. A method capable of rapidly and accurately measuring the gas production rate in the battery becomes the premise of gas production research.
At present, the methods for testing the gas generation of the aluminum shell mainly comprise two methods: firstly, internal pressure is measured on line, a special testing device is needed, a specific sample preparation requirement is met, a battery is generally connected with a pressure measuring component through a pipeline, internal pressure is measured, the testing device is complex, the sample preparation requirement is high, and the problem of sealing failure exists; destructive testing, wherein a testing system is integrated, the internal pressure of the battery is directly tested by penetrating a probe into an explosion-proof valve, and because the gas in the battery is sprayed outwards at the moment when the probe penetrates into the explosion-proof valve, the internal pressure can be rapidly reduced, a large error can occur in the internal pressure testing, and the internal pressure testing is slightly low; although the above two methods can measure the internal pressure, the gas amount cannot be measured because the residual space (gas space) inside the battery is not clear and cannot be converted.
In view of the above problems, no effective solution has been proposed.
Disclosure of Invention
The embodiment of the invention provides a method and a device for testing gas production of a battery, which are used for at least solving the technical problem that the gas quantity cannot be measured while internal pressure can be tested in the related technology.
According to an aspect of an embodiment of the present invention, there is provided a method for testing gas production of a battery, including: determining the volume change of a closed container, wherein a target battery is placed in the closed container, and the volume change is the volume change value of the closed container before and after the target battery is punctured by an explosion-proof valve; determining a volume of space occupied by internal gas of the target cell; and determining the gas production rate of the target battery according to the volume change and the space volume.
Optionally, determining the volume change of the closed container comprises: and calculating the volume change amount by using a drainage method, or calculating the volume change amount by using a tension method.
Optionally, calculating the volume change amount by using a drainage method includes: controlling the closed container to be placed in a water tank and submerged below the water level, marking the water level of the water tank and recording a first weight of the water tank; controlling to take out the closed container from the water tank, puncturing an explosion-proof valve of the target battery by using a target tool, putting the closed container into the water tank again and immersing the closed container below the water surface, adjusting the water level to a mark position by adjusting the water quantity of the water tank, and recording the second weight of the water tank; obtaining the water discharge amount of the water tank according to the first weight and the second weight; determining the volume change amount according to the displacement.
Optionally, determining the volume change amount according to the displacement includes: acquiring the density of water in the water tank; and calculating the volume change according to the water displacement and the density of the water.
Optionally, the calculating the volume change amount by using a tension method includes: acquiring a first tension value corresponding to the closed container before the explosion-proof valve of the target battery is punctured; acquiring a second tension value corresponding to the closed container after the explosion-proof valve of the target battery is punctured; obtaining a tension change value of the closed container according to the first tension value and the second tension value; and determining the volume change according to the tension change value.
Optionally, determining the volume of space occupied by the internal gas of the target cell comprises: injecting target liquid into the target battery through the punctured explosion-proof valve until the target battery is full; calculating the volume of the target liquid injected; and taking the volume of the target liquid as the space volume occupied by the internal gas of the target battery.
Optionally, after determining the gas production rate of the target battery according to the volume change amount and the spatial volume, the method further includes: acquiring the air pressure of the position where the target battery is located and the space volume; and calculating the internal pressure of the target battery according to the air pressure, the space volume and the gas production.
According to another aspect of the embodiments of the present invention, there is also provided a device for testing gas production of a battery, including: the device comprises a first determining module, a second determining module and a control module, wherein the first determining module is used for determining the volume change of a closed container, a target battery is placed in the closed container, and the volume change is the volume change of the closed container before and after the target battery is punctured by an explosion-proof valve; a second determination module for determining a volume of space occupied by the internal gas of the target cell; and the third determining module is used for determining the gas production of the target battery according to the volume change and the space volume.
According to another aspect of the embodiment of the present invention, there is also provided a computer-readable storage medium, where the computer-readable storage medium includes a stored program, where the program, when executed, controls an apparatus where the computer-readable storage medium is located to execute the method for testing the gas production of the battery according to any one of the above.
According to another aspect of the embodiment of the present invention, there is further provided a processor, configured to run a program, where the program is executed to perform the method for testing the gas production of the battery.
In the embodiment of the invention, the volume change of the closed container is determined, wherein the closed container is internally provided with a target battery, and the volume change is the volume change value of the closed container before and after the target battery is punctured by the explosion-proof valve; determining a volume of space occupied by internal gas of the target cell; according to the volume change and the space volume, the gas production of the target battery is determined, the volume change of the closed container in which the target battery is placed and the space volume occupied by the internal gas of the target battery are calculated, and the purpose of accurately obtaining the gas production of the target battery is achieved, so that the requirement of reducing the sealing property is met, the test precision is improved, the internal pressure and the gas production can be measured simultaneously, the complexity of the device is reduced, the technical effects of accurately testing the gas production and the internal pressure by conventional equipment are achieved, and the technical problem that the internal pressure can be tested but the gas quantity cannot be measured in the related technology is solved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
FIG. 1 is a flow chart of a method of testing gas production from a battery according to an embodiment of the present invention;
FIG. 2 is a schematic view of a drainage method apparatus according to an alternative embodiment of the invention;
fig. 3 is a schematic diagram of a device for testing gas production of a battery according to an embodiment of the present invention.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Example 1
In accordance with an embodiment of the present invention, there is provided an embodiment of a method for testing gas production from a battery, it being noted that the steps illustrated in the flowchart of the drawings may be performed in a computer system, such as a set of computer-executable instructions, and that while a logical order is illustrated in the flowchart, in some cases the steps illustrated or described may be performed in an order different than presented herein.
Fig. 1 is a flowchart of a method for testing gas production of a battery according to an embodiment of the present invention, as shown in fig. 1, the method including the steps of:
step S102, determining the volume change of a closed container, wherein a target battery is placed in the closed container, and the volume change is the volume change value of the closed container before and after the target battery is punctured by an explosion-proof valve;
in an alternative embodiment, determining the amount of change in the volume of the containment vessel comprises: the volume change amount is calculated by a drainage method, or the volume change amount is calculated by a tension method.
In the specific implementation process, the volume change can be calculated by using a drainage method, and the method specifically comprises the following steps: controlling to place the closed container into the water tank and submerge the closed container below the water level, marking the water level of the water tank and recording a first weight of the water tank; controlling to take out the closed container from the water tank, puncturing an explosion-proof valve of the target battery by using a target tool, putting the closed container into the water tank again, submerging the closed container below the water level, adjusting the water level to a mark position by adjusting the water quantity of the water tank, and recording the second weight of the water tank; obtaining the water discharge amount of the water tank according to the first weight and the second weight; the volume change is determined according to the displacement. The volume change is calculated by acquiring the density of water in the water tank and then according to the water discharge and the density of the water. The volume change of the closed container can be accurately calculated by a drainage method.
The closed container may optionally have a freely expandable, sealable element, such as a valve bag or the like; the target means may be a sharp object that can pierce an explosion-proof valve, such as a knife or the like; the water tank can be a container with a high opening and a small opening, wherein the water in the water tank needs to be purified water; a balance scale with proper precision can be selected according to the requirement to obtain the weight of the water tank; marking the water level by using a marking pen; a water ladle or an automatic drainage tool can be used for adjusting the water quantity of the water tank.
In a specific implementation process, the volume change amount can be calculated by using a tension method, and the method specifically comprises the following steps: acquiring a first tension value corresponding to a closed container before an explosion-proof valve of a target battery is punctured; acquiring a second tension value corresponding to the closed container after the explosion-proof valve of the target battery is punctured; obtaining a tension change value of the closed container according to the first tension value and the second tension value; and determining the volume change according to the tension change value. The volume change amount of the closed container can be accurately calculated by the tension method.
Step S104, determining the space volume occupied by the internal gas of the target battery;
in an alternative embodiment, determining the volume of space occupied by the internal gases of the target cell comprises: injecting target liquid into the target battery through the punctured explosion-proof valve until the target battery is full; calculating the volume of the injected target liquid; the volume of the target liquid is taken as the volume of the space occupied by the internal gas of the target cell.
The target liquid can be a compound such as dimethyl carbonate and the like, cannot react with the internal materials of the battery, and has low viscosity; a graduated syringe may be used to inject the target fluid into the target cell, where the syringe size may be selected based on the size of the remaining space in the cell.
And step S106, determining the gas production rate of the target battery according to the volume change and the space volume.
In an optional embodiment, after determining the gas production rate of the target battery according to the volume change amount and the spatial volume, the method further includes: acquiring the air pressure and the space volume of the position of a target battery; and calculating the internal pressure of the target battery according to the air pressure, the space volume and the gas production.
Through the steps, the gas production amount of the target battery can be calculated through the volume change amount of the closed container for placing the target battery and the space volume occupied by the internal gas of the target battery, the purpose of accurately obtaining the gas production amount of the target battery is achieved, the requirement for reducing the sealing performance is realized, the test precision is improved, the internal pressure and the gas production amount can be measured simultaneously, the complexity of the device is reduced, the technical effects of accurately testing the gas production amount and the internal pressure can be realized through conventional equipment, and then the technical problem that the internal pressure can be tested in the related technology but the gas amount cannot be measured is solved.
An alternative embodiment of the invention is described in detail below.
Fig. 2 is a schematic diagram of a drainage method device according to an alternative embodiment of the invention, and as shown in fig. 2, the drainage method device can be used for testing the gas production of the battery, and the specific implementation steps are as follows:
the first step is as follows: the battery is placed in the self-sealing bag, and a knife is placed inside the self-sealing bag; placing the self-sealing bag into a water tank, immersing the self-sealing bag below the liquid level, recording the liquid level by using a mark note and marking the mark A; measured weight m 0;
the cell was placed in a sealed volume variable container at normal pressure and the sealed volume was V0, which was measured by the drainage method.
The second step is that: taking out the valve bag, puncturing the explosion-proof valve by a knife, continuously placing the valve bag into the water tank, regulating the water quantity by a water ladle, ensuring the liquid level to be at the mark A, and reading the reading of a balance scale, m 1; it should be noted that, at this time, it is necessary to ensure that the valve bag is below the liquid level, and the valve bag can continue to expand under normal pressure;
it should be noted that the sealed volume of the puncture explosion-proof valve after being stabilized is V1, and the volume is measured by using the substance conservation principle and the drainage method.
The third step: taking out the battery, and injecting Dimethyl Carbonate (DMC) liquid into the battery through the broken explosion-proof valve by using a syringe until the battery is filled, wherein the volume of the injected liquid is V2;
note that the internal gas space of the cell was measured as V2, which was measured in volume using the air evacuation method.
The fourth step: volume & internal pressure calculations. The internal gas volume of the battery is: V1-V0+ V2; the internal pressure of the battery is as follows: (V1-V0+ V2) P0/V2; the calculated pressure is absolute pressure and P0 is atmospheric pressure.
Note that, at this time, the internal cell pressure is calculated using avogalois law (ideal gas state equation).
Example 2
According to another aspect of the embodiments of the present invention, there is also provided a device for testing gas production of a battery, fig. 3 is a schematic view of the device for testing gas production of a battery according to the embodiments of the present invention, as shown in fig. 3, the device for testing gas production of a battery includes: a first determination module 32, a second determination module 34, and a third determination module 36. The following describes the apparatus for testing the gas production of the battery in detail.
The first determining module 32 is configured to determine a volume change of the sealed container, where a target battery is placed in the sealed container, and the volume change is a volume change value of the sealed container before and after the target battery is punctured by the explosion-proof valve; a second determination module 34, connected to the first determination module 32, for determining the volume of the space occupied by the internal gas of the target cell; and a third determining module 36, connected to the second determining module 34, for determining the gas production of the target battery according to the volume change and the spatial volume.
It should be noted that the above modules may be implemented by software or hardware, for example, for the latter, the following may be implemented: the modules can be located in the same processor; and/or the modules are located in different processors in any combination.
In the above embodiment, the device for testing the gas production rate of the battery can calculate the gas production rate of the target battery through the volume change of the closed container in which the target battery is placed and the space volume occupied by the internal gas of the target battery, so that the purpose of accurately obtaining the gas production rate of the target battery is achieved, the requirement for reducing the sealing property is met, the testing precision is improved, the internal pressure and the gas production rate can be simultaneously measured, the complexity of the device is reduced, the technical effect of accurately testing the gas production rate and the internal pressure by using conventional equipment is achieved, and the technical problem that the internal pressure can be tested but the gas quantity cannot be measured in the related technology is solved.
It should be noted here that the first determining module 32, the second determining module 34, and the third determining module 36 correspond to steps S102 to S106 in embodiment 1, and the modules are the same as the corresponding steps in the implementation example and the application scenario, but are not limited to the disclosure in embodiment 1.
Optionally, the first determining module 32 includes: a first calculation unit for calculating the volume change amount by a drainage method, or a second calculation unit for calculating the volume change amount by a tension method.
Optionally, the first calculating unit includes: a first control subunit for controlling the placing of the closed container into the water tank and the immersion below the water surface, marking the water level of the water tank and recording a first weight of the water tank; the second control subunit is used for controlling the closed container to be taken out of the water tank, puncturing the explosion-proof valve of the target battery by using the target tool, putting the closed container into the water tank again and immersing the closed container below the water level, adjusting the water level to a mark position by adjusting the water quantity of the water tank, and recording the second weight of the water tank; the first obtaining subunit is used for obtaining the water discharge of the water tank according to the first weight and the second weight; a first determining subunit for determining the volume change amount according to the displacement.
Optionally, the determining sub-unit comprises: the first acquisition subunit is used for acquiring the density of water in the water tank; and the calculation subunit is used for calculating the volume change according to the water discharge and the density of the water.
Optionally, the second calculating unit includes: the second acquiring subunit is used for acquiring a first tension value corresponding to the explosion-proof valve front closed container of the punctured target battery; the third acquiring subunit is used for acquiring a second tension value corresponding to the closed container after the explosion-proof valve of the target battery is punctured; the second obtaining subunit is used for obtaining a tension change value of the closed container according to the first tension value and the second tension value; and the second determining subunit is used for determining the volume change according to the tension change value.
Optionally, the second determining module 34 includes: the injection unit is used for injecting target liquid into the target battery through the punctured explosion-proof valve until the target battery is full of the target liquid; a third calculation unit for calculating the volume of the injected target liquid; and a processing unit for setting the volume of the target liquid as the volume of the space occupied by the internal gas of the target cell.
Optionally, the apparatus further comprises: the acquisition module is used for acquiring the air pressure and the space volume of the position where the target battery is located after the air production of the target battery is determined according to the volume change and the space volume; and the calculation module is used for calculating the internal pressure of the target battery according to the air pressure, the space volume and the gas production rate.
Example 3
According to another aspect of the embodiments of the present invention, there is also provided a computer-readable storage medium, which includes a stored program, wherein when the program runs, the apparatus on which the computer-readable storage medium is located is controlled to execute the method for testing the gas production of the battery according to any one of the above items.
Example 4
According to another aspect of the embodiments of the present invention, there is also provided a processor for executing a program, wherein the program executes the method for testing the gas production of the battery according to any one of the above methods.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
In the above embodiments of the present invention, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
In the embodiments provided in the present application, it should be understood that the disclosed technology can be implemented in other ways. The above-described embodiments of the apparatus are merely illustrative, and for example, the division of the units may be a logical division, and in actual implementation, there may be another division, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, units or modules, and may be in an electrical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit 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 invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a removable hard disk, a magnetic or optical disk, and other various media capable of storing program codes.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A method for testing gas production of a battery is characterized by comprising the following steps:
determining the volume change of a closed container, wherein a target battery is placed in the closed container, and the volume change is the volume change value of the closed container before and after the target battery is punctured by an explosion-proof valve;
determining a volume of space occupied by internal gas of the target cell;
and determining the gas production rate of the target battery according to the volume change and the space volume.
2. The method of claim 1, wherein determining the amount of change in the volume of the containment vessel comprises:
and calculating the volume change amount by using a drainage method, or calculating the volume change amount by using a tension method.
3. The method of claim 2, wherein calculating the volume change using drainage comprises:
controlling the closed container to be placed in a water tank and submerged below the water level, marking the water level of the water tank and recording a first weight of the water tank;
controlling to take out the closed container from the water tank, puncturing an explosion-proof valve of the target battery by using a target tool, putting the closed container into the water tank again and immersing the closed container below the water surface, adjusting the water level to a mark position by adjusting the water quantity of the water tank, and recording the second weight of the water tank;
obtaining the water discharge amount of the water tank according to the first weight and the second weight;
determining the volume change amount according to the displacement.
4. The method of claim 3, wherein determining the volume change amount from the displacement amount comprises:
acquiring the density of water in the water tank;
and calculating the volume change according to the water displacement and the density of the water.
5. The method of claim 2, wherein calculating the volume change using a tension method comprises:
acquiring a first tension value corresponding to the closed container before the explosion-proof valve of the target battery is punctured;
acquiring a second tension value corresponding to the closed container after the explosion-proof valve of the target battery is punctured;
obtaining a tension change value of the closed container according to the first tension value and the second tension value;
and determining the volume change according to the tension change value.
6. The method of claim 1, wherein determining the volume of space occupied by the internal gas of the target cell comprises:
injecting target liquid into the target battery through the punctured explosion-proof valve until the target battery is full;
calculating the volume of the target liquid injected;
and taking the volume of the target liquid as the space volume occupied by the internal gas of the target battery.
7. The method according to any one of claims 1 to 6, further comprising, after determining the gas production of the target battery according to the volume change amount and the spatial volume:
acquiring the air pressure of the position where the target battery is located and the space volume;
and calculating the internal pressure of the target battery according to the air pressure, the space volume and the gas production.
8. A device for testing gas production of a battery, comprising:
the device comprises a first determining module, a second determining module and a control module, wherein the first determining module is used for determining the volume change of a closed container, a target battery is placed in the closed container, and the volume change is the volume change of the closed container before and after the target battery is punctured by an explosion-proof valve;
a second determination module for determining a volume of space occupied by the internal gas of the target cell;
and the third determining module is used for determining the gas production of the target battery according to the volume change and the space volume.
9. A computer-readable storage medium, comprising a stored program, wherein the program, when executed, controls an apparatus in which the computer-readable storage medium is located to perform the method for testing the gas production of a battery according to any one of claims 1 to 7.
10. A processor for running a program, wherein the program is run to perform the method of testing the gas production of a battery of any of claims 1 to 7.
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| CN202111480146.7A CN114235084A (en) | 2021-12-06 | 2021-12-06 | Method and device for testing gas production of battery |
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| CN118010233A (en) * | 2024-04-08 | 2024-05-10 | 宁德时代新能源科技股份有限公司 | Air pressure detection structure, system, method, device, apparatus and storage medium |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN118010233A (en) * | 2024-04-08 | 2024-05-10 | 宁德时代新能源科技股份有限公司 | Air pressure detection structure, system, method, device, apparatus and storage medium |
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| CB02 | Change of applicant information | ||
| CB02 | Change of applicant information |
Address after: 518107 Xinwangda Industrial Park, No.18, Tangjia south, Gongming street, Guangming New District, Shenzhen City, Guangdong Province Applicant after: Xinwangda Power Technology Co.,Ltd. Address before: 518107 Xinwangda Industrial Park, No.18, Tangjia south, Gongming street, Guangming New District, Shenzhen City, Guangdong Province Applicant before: SUNWODA ELECTRIC VEHICLE BATTERY Co.,Ltd. |