CN112380644A - Method and device for testing strength of battery pack shell - Google Patents
Method and device for testing strength of battery pack shell Download PDFInfo
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Abstract
The invention provides a method and a device for testing the strength of a battery pack shell, which comprises the following steps: acquiring the model of a target battery module and the model of a target shell corresponding to a battery pack to be inspected; determining a target position of a target shell, placing a pressurizing device on the target position of the target shell instead of a target battery module, and arranging a sensing structure at the target position, wherein the target position is a position where the strength of the target shell cannot bear the possibility of the applied preset bulging force; applying a preset bulging force to the target position through a pressurizing device, wherein the preset bulging force corresponds to the model of the target battery module; and comparing the strain value acquired by the sensing structure with the yield strength corresponding to the model of the target shell, inspecting the strength of the target shell in the battery pack to be inspected, and ensuring the safety and reliability of battery assembly on the basis of shortening the inspection period.
Description
Technical Field
The invention relates to the technical field of battery assembly, in particular to a method and a device for testing the strength of a battery pack shell.
Background
With the rapid development of science and technology, electric vehicles are widely used in the automobile industry. In the production and manufacturing process of the electric automobile, the production of the battery pack has a great influence on the safe operation of the automobile. Therefore, the safety of the battery pack is strictly detected by automobile manufacturers in the production process.
For the battery pack shell, because the shell is internally provided with a plurality of battery modules, and each battery module can release bulging force to the outside due to the characteristics of the battery core in the charging and discharging use process, and further the surrounding structure can be damaged. In order to guarantee the driving safety of the automobile, an automobile manufacturing manufacturer needs to detect the strength of each battery pack shell to ensure that the shell strength can bear the bulging force generated by the battery module in the shell, and the detection method needs a longer period, has higher requirements on equipment and environment and is not beneficial to the high efficiency of automobile production.
Disclosure of Invention
In view of the above, the present invention provides a method and an apparatus for testing the strength of a battery pack case, which can ensure the safety and reliability of battery assembly on the basis of shortening the testing period.
In a first aspect, an embodiment provides a method for testing the strength of a battery pack shell, including:
acquiring the model of a target battery module and the model of a target shell corresponding to a battery pack to be inspected;
determining a target position of the target shell, placing a pressurizing device on the target position of the target shell instead of the target battery module, and arranging a sensing structure at the target position, wherein the target position is a position where the strength of the target shell cannot bear the possibility of the applied preset bulging force;
applying a preset bulging force to the target position through the pressurizing device, wherein the preset bulging force corresponds to the model of the target battery module;
and comparing the strain value acquired by the sensing structure with the yield strength corresponding to the model of the target shell, and testing the strength of the target shell in the battery pack to be tested.
In an alternative embodiment, the step of comparing the strain value acquired by the sensing structure with the yield strength corresponding to the model of the target shell and checking the strength of the target shell in the battery pack to be checked includes:
if all the strain values acquired by the sensing structures are smaller than the yield strength, the strength of the target shell in the battery pack to be inspected is qualified;
and if the strain value acquired by the sensing structure is greater than or equal to the yield strength, the target shell in the battery pack to be inspected is unqualified in strength inspection.
In an alternative embodiment, the method further comprises:
and if the strength of the target shell is qualified, storing and recording the strengthening treatment condition of the target shell and the target position of the pressurizing device placed on the target shell.
In an alternative embodiment, the method further comprises:
and if the target shell strength is not qualified, strengthening the target position corresponding to the sensing structure with the unqualified strain value, and re-testing the target shell strength in the battery pack to be tested, wherein the target position comprises at least one, and the strengthening treatment comprises reinforcing rib treatment, thickened plate treatment and impact structure improvement treatment.
In an alternative embodiment, the method further comprises:
determining a free space of the target housing based on the target position, and disposing additional components inside the target housing.
In an alternative embodiment, before the step of placing the pressurizing means at the target position of the target housing instead of the target battery module, the method further includes:
judging whether historical inspection is carried out on the battery pack to be inspected, which comprises the same target battery module type and the same target shell type;
if so, correspondingly processing the target shell according to the strengthening processing condition of the storage record, and placing the target battery module at the target position, so that the battery pack to be inspected can bear the bulging force of the target battery module under the condition of no inspection.
In an alternative embodiment, the step of determining the target position of the target enclosure comprises:
performing simulation force application processing on the target shell to obtain a stress analysis result of the target shell, wherein the simulation force application processing comprises collision processing, vibration processing and impact processing;
and determining the target position of the target shell according to the stress analysis result.
In a second aspect, an embodiment provides a device for testing the strength of a battery pack case, including:
the acquisition module is used for acquiring the model of a target battery module and the model of a target shell corresponding to the battery pack to be inspected;
the determination module is used for determining a target position of the target shell, placing a pressurizing device on the target position of the target shell instead of the target battery module, and arranging a sensing structure at the target position, wherein the target position is a position where the strength of the target shell cannot bear the possibility of applying a preset bulging force;
the force application module is used for applying a preset bulging force to the target position through the pressurizing device, wherein the preset bulging force corresponds to the model of the target battery module;
and the inspection module is used for comparing the strain value acquired by the sensing structure with the yield strength corresponding to the model of the target shell and inspecting the strength of the target shell in the battery pack to be inspected.
In a third aspect, an embodiment provides an electronic device, including a memory and a processor, where the memory stores a computer program operable on the processor, and the processor implements the steps of the method described in any one of the foregoing embodiments when executing the computer program.
In a fourth aspect, embodiments provide a machine-readable storage medium having stored thereon machine-executable instructions that, when invoked and executed by a processor, cause the processor to carry out the steps of the method of any preceding embodiment.
According to the method and the device for testing the strength of the battery pack shell, provided by the embodiment of the invention, the battery in the battery pack shell to be tested is replaced by the pressurizing device, the bulging force of the target battery module corresponding to the battery pack to be tested is applied to the target position of the battery pack shell possibly having the bearing force influence, and the stress value detected by the strain gauge at the joint of the target battery module and the target shell is compared with the yield strength corresponding to the model of the target shell, so that the strength of the battery pack shell can be tested quickly.
Additional features and advantages of the disclosure will be set forth in the description which follows, or in part may be learned by the practice of the above-described techniques of the disclosure, or may be learned by practice of the disclosure.
In order to make the aforementioned objects, features and advantages of the present disclosure more comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic diagram of a battery pack housing;
fig. 2 is a flowchart of a method for testing the strength of a battery pack case according to an embodiment of the present invention;
fig. 3 is a schematic application diagram of a method for testing the strength of a battery pack case according to an embodiment of the present invention;
fig. 4 is a functional block diagram of a device for testing the strength of a battery pack case according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a hardware architecture of an electronic device according to an embodiment of the present invention.
Detailed Description
To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some, but not all embodiments of the present invention. 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.
For the existing automobile production, the production of the battery pack is an important link for ensuring the subsequent driving safety of the automobile, namely, in the production process, each component of the battery pack needs to be subjected to strict standard test. The embodiment of the invention mainly aims at detecting and testing the strength of the shell of the battery pack in the production of the battery pack. As shown in fig. 1, a plurality of battery modules, each of which is exemplified by a single battery module in fig. 1, are disposed inside a battery pack case, and each of the battery modules includes a module outer frame and a plurality of batteries disposed inside the module outer frame.
The conventional test method generally includes naturally charging and discharging the battery module until the end of life, and testing whether the battery pack case is damaged or not in this state. The test method has a long period, generally about 1 year or more, and influences the development and production period. Meanwhile, the requirements on environment and equipment are high, and the test cost is high.
In addition, for automobiles with different models and different requirements, when the model of any one of the battery module and the battery pack shell in the battery pack is changed, the test needs to be performed again. The strength of the battery can body is detected according to the test method, so that the production research and development efficiency of the automobile is low.
Based on the above, the method and the device for testing the strength of the battery pack shell provided by the embodiment of the invention can ensure the safety and reliability of battery assembly on the basis of shortening the testing period.
For the convenience of understanding the present embodiment, a method for testing the strength of the battery pack case disclosed in the present embodiment will be described in detail.
Fig. 2 is a flowchart of a method for testing the strength of a battery pack case according to an embodiment of the present invention.
As shown in fig. 2, the method for testing the strength of the battery pack shell comprises the following steps:
step S102, acquiring the model of a target battery module and the model of a target shell corresponding to a battery pack to be inspected;
here, as described above, each battery pack includes a plurality of battery modules, the number of the battery modules in each battery pack is the same, and the battery pack case includes a plurality of types. The method comprises the steps of firstly determining the models of a target battery module and a target shell in a battery pack to be inspected, and then inspecting the strength of the shell.
Step S104, determining a target position of the target shell, placing a pressurizing device on the target position of the target shell instead of the target battery module, and arranging a sensing structure at the target position, wherein the target position is a position where the strength of the target shell cannot bear the possibility of the applied preset bulging force;
it should be noted that, in general, the portion of the battery pack case that is relatively susceptible to the bulging pressure of the battery module is a battery pack lower case, which is specifically a lower case on the side of the battery pack mounting position facing the ground. As shown in fig. 3, the structure of the battery module inside the battery pack case is changed, and the battery in the battery module is replaced with a pressurizing device.
Step S106, applying a preset bulging force to the target position through the pressurizing device, wherein the preset bulging force corresponds to the model of the target battery module;
it can be understood that the swelling forces that may be generated by different battery module types are different, and therefore whether the corresponding target position has the bearing capacity for swelling is checked by applying the swelling force of the battery of the corresponding type at the target position where the situation that cannot bear the swelling force may be generated.
Here, the pressurizing device may generally need to apply a swelling force of about 15000N, and a device structure for applying pressure to generate pressure such as a cylinder, a pneumatic cylinder, etc. may be employed. Relatively speaking, the cylinder is simple and convenient to realize the pressurizing function, and the oil cylinder can apply relatively larger expansion force.
And S108, comparing the strain value acquired by the sensing structure with the yield strength corresponding to the model of the target shell, and checking the strength of the target shell in the battery pack to be checked.
Here, the sensing structure may include a device structure such as a strain gauge and a sensor that can be used to detect compressive strain. Wherein one or more sensing structures may be provided for each target position, so that the detection of strain values can be achieved more accurately.
In the preferred embodiment of practical application, through will examine the inside battery of battery package casing and replace into pressure device, exert the bulging force that corresponds the target battery module of waiting to examine the battery package to the target position that probably has the bearing capacity influence of battery package casing, the strain value that rethread target battery module and the strain gage detection of target casing junction compares with the yield strength that the target casing model corresponds, realize comparatively fast the inspection to battery package casing intensity, use this kind of inspection mode, can be on the basis of guaranteeing battery package production security, shorten production research and development cycle.
In some embodiments, step S104 can be further implemented by the following steps, including:
step 1.1), carrying out simulation force application processing on the target shell to obtain a stress analysis result of the target shell, wherein the simulation force application processing comprises collision processing, vibration processing and impact processing;
and 1.2) determining the target position of the target shell according to the stress analysis result.
Here, the target casing of the battery pack to be inspected is subjected to simulation stress analysis in advance, so that the target position with the possibility of not bearing the expansion force, namely, the unqualified target position is preliminarily checked. It is understood that, by presetting a threshold value of the force analysis result, if the pressure applied to the position exceeds the threshold value of the force analysis result, the position is taken as the target position to be checked. The preset stress analysis result threshold corresponds to the model of the target shell and the position of the target shell. For example, the target casing model a and the target casing model B may correspond to different stress analysis result thresholds, or different stress positions of the target casing model a and the target casing model a may correspond to different stress analysis result thresholds, which may be specifically set according to actual conditions, and can be realized by those skilled in the art.
In some embodiments, step S108 further comprises the steps of:
step 2.1), if the strain values acquired by all the sensing structures are smaller than the yield strength, the strength of a target shell in the battery pack to be inspected is inspected to be qualified;
and 2.2) if the strain value acquired by the sensing structure is greater than or equal to the yield strength, the target shell in the battery pack to be inspected is unqualified in strength inspection.
According to the foregoing embodiment, it can be known that the target positions having the possibility of being failed through the stress analysis may include a plurality of target positions, and the failed target positions are known through comparing the strain value acquired by the sensing structure disposed at each target position with the yield strength. For example, there may be multiple target locations, where there may be one, several, or all of the failed target locations.
In some embodiments, in order to ensure that the produced battery pack case can meet the requirement of bearing the bulging force and has higher driving safety, the method further comprises the following steps:
and 3.1) if the target shell strength is not qualified, performing strengthening treatment on a target position corresponding to the sensing structure with a unqualified strain value, and re-testing the target shell strength in the battery pack to be tested, wherein the strengthening treatment comprises reinforcing rib treatment, thickened plate treatment and impact structure improvement treatment.
As an alternative embodiment, the reinforcement processing further includes changing the installation position of the module, for example, after the foregoing checking step and the preliminary simulation analysis, the target position A, B, C may have a weak stress; and applying preset bulging force and comparing strain values to obtain that the target position C is unqualified in inspection, repairing and reinforcing the target position C, transferring the target battery module, namely not arranging the target battery module in the target position C, and moving the target battery module to other positions qualified in inspection for installation.
In some embodiments, a lot of battery packs are generally collectively produced by testing, and in order to more rapidly realize the test of the strength of the battery pack shell, the method further comprises the following steps:
and 4.1) if the strength of the target shell is qualified, storing and recording the strengthening treatment condition of the target shell and the target position of the pressurizing device placed on the target shell.
In some embodiments, before placing the pressurizing device in place of the target battery module at the target position of the target housing in step S104, the method further includes:
and 5.1) judging whether historical inspection is carried out on the battery pack to be inspected, which comprises the same target battery module type and the same target shell type.
And 5.2), if so, correspondingly processing the target shell according to the strengthening processing condition of the storage record, and placing the target battery module at the target position, so that the battery pack to be inspected can bear the bulging force of the target battery module under the condition that the inspection is not needed.
And 5.3), if not, adopting the testing method in the previous embodiment to test the strength of the target shell.
Here, treat that the target battery module model in the battery package is X, target casing model is Y, through strengthening the processing condition and the pressure device's of the qualified target casing of inspection position of placing record, if the production of testing again includes that the target battery module model is X, the target casing model is Y treats the battery package, then can need not the inspection, strengthen repairing current casing directly according to the strengthening the processing condition of record to place the target battery module in the target position that pressure device set up.
In some embodiments, other devices besides the battery module need to be disposed inside the battery pack case to achieve corresponding functions, the number and the positions of the battery modules disposed in fig. 1 and 3 are only an example, that is, after the strength of the battery pack case is checked and the installation position of the battery module is determined, the disposition positions of the other devices need to be determined, and the specific method further includes:
step 6.1), determining the free space of the target shell based on the target position, and arranging additional parts in the target shell.
Illustratively, as shown in fig. 4, the embodiment further provides a device 400 for verifying the strength of a battery pack case, comprising:
the obtaining module 401 is configured to obtain a model of a target battery module and a model of a target housing corresponding to a battery pack to be inspected;
a determining module 402, configured to determine a target position of the target housing, place a pressurizing device on the target position of the target housing instead of the target battery module, and set a sensing structure at the target position, where the target position is a position where the strength of the target housing cannot bear the possibility of a preset applied swelling force;
a force application module 403, configured to apply a preset bulging force to the target position through the pressurization device, where the preset bulging force corresponds to a model of the target battery module;
and the checking module 404 is configured to compare the strain value acquired by the sensing structure with the yield strength corresponding to the model of the target shell, and check the strength of the target shell in the battery pack to be checked.
In an optional embodiment, the inspection module is further specifically configured to, if all the strain values acquired by the sensing structures are smaller than the yield strength, pass the inspection of the target shell strength in the battery pack to be inspected; and if the strain value acquired by the sensing structure is greater than or equal to the yield strength, the target shell in the battery pack to be inspected is unqualified in strength inspection.
In an alternative embodiment, the apparatus further comprises a recording module for storing and recording the reinforcement processing condition of the target casing and the target position of the pressurizing device placed on the target casing if the target casing strength is qualified.
In an optional embodiment, the apparatus further includes a reinforcing module, configured to, if the target casing strength is not qualified, perform reinforcing processing on a target position corresponding to the sensing structure with a unqualified strain value, and re-inspect the target casing strength in the battery pack to be inspected, where the target position includes at least one, and the reinforcing processing includes reinforcing rib processing, thickened plate processing, and impact structure improvement processing.
In an alternative embodiment, the apparatus further comprises a mounting module for determining a free space of the target enclosure based on the target location and disposing additional components inside the target enclosure.
In an optional embodiment, the device further comprises a quick inspection module, which is used for judging whether historical inspection is performed on the battery pack to be inspected, wherein the battery pack to be inspected comprises the same target battery module type and the same target shell type; if so, correspondingly processing the target shell according to the strengthening processing condition of the storage record, and placing the target battery module at the target position, so that the battery pack to be inspected can bear the bulging force of the target battery module under the condition of no inspection.
In an optional implementation manner, the device further includes a simulation module, configured to perform simulation force application processing on the target casing to obtain a stress analysis result of the target casing, where the simulation force application processing includes collision processing, vibration processing, and impact processing; and determining the target position of the target shell according to the stress analysis result.
Fig. 5 is a hardware architecture diagram of an electronic device 500 according to an embodiment of the present invention. Referring to fig. 5, the computer apparatus includes: a machine-readable storage medium 501 and a processor 502, and may further include a non-volatile storage medium 503, a communication interface 504, and a bus 505; the machine-readable storage medium 501, the processor 502, the non-volatile storage medium 503, and the communication interface 504 are in communication with each other via a bus 505. The processor 502 may perform the method of verifying the strength of the battery pack case described in the above embodiments by reading and executing the machine-executable instructions of the verification of the strength of the battery pack case in the machine-readable storage medium 501.
A machine-readable storage medium as referred to herein may be any electronic, magnetic, optical, or other physical storage device that can contain or store information such as executable instructions, data, and the like. For example, the machine-readable storage medium may be: a RAM (random Access Memory), a volatile Memory, a non-volatile Memory, a flash Memory, a storage drive (e.g., a hard drive), any type of storage disk (e.g., an optical disk, a dvd, etc.), or similar storage medium, or a combination thereof.
The non-volatile medium may be non-volatile memory, flash memory, a storage drive (e.g., a hard drive), any type of storage disk (e.g., an optical disk, dvd, etc.), or similar non-volatile storage medium, or a combination thereof.
It can be understood that, for the specific operation method of each functional module in this embodiment, reference may be made to the detailed description of the corresponding step in the foregoing method embodiment, and no repeated description is provided herein.
The computer-readable storage medium provided in the embodiments of the present invention stores a computer program, and when executed, the computer program code may implement the method for testing the strength of the battery pack case according to any of the embodiments described above, and specific implementation may refer to the method embodiments, which are not described herein again.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the system and the apparatus described above may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In addition, in the description of the embodiments of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Finally, it should be noted that: the above-mentioned embodiments are only specific embodiments of the present invention, which are used for illustrating the technical solutions of the present invention and not for limiting the same, and the protection scope of the present invention is not limited thereto, although the present invention is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: any person skilled in the art can modify or easily conceive the technical solutions described in the foregoing embodiments or equivalent substitutes for some technical features within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the embodiments of the present invention, and they should be construed as being included therein.
Claims (10)
1. A method for testing the strength of a battery pack shell is characterized by comprising the following steps:
acquiring the model of a target battery module and the model of a target shell corresponding to a battery pack to be inspected;
determining a target position of the target shell, placing a pressurizing device on the target position of the target shell instead of the target battery module, and arranging a sensing structure at the target position, wherein the target position is a position where the strength of the target shell cannot bear the possibility of the applied preset bulging force;
applying a preset bulging force to the target position through the pressurizing device, wherein the preset bulging force corresponds to the model of the target battery module;
and comparing the strain value acquired by the sensing structure with the yield strength corresponding to the model of the target shell, and testing the strength of the target shell in the battery pack to be tested.
2. The method of claim 1, wherein the step of comparing the strain values collected by the sensing structure with yield strengths corresponding to the model of the target case to verify the target case strength in the battery pack to be verified comprises:
if all the strain values acquired by the sensing structures are smaller than the yield strength, the strength of the target shell in the battery pack to be inspected is qualified;
and if the strain value acquired by the sensing structure is greater than or equal to the yield strength, the target shell in the battery pack to be inspected is unqualified in strength inspection.
3. The method of claim 2, further comprising:
and if the strength of the target shell is qualified, storing and recording the strengthening treatment condition of the target shell and the target position of the pressurizing device placed on the target shell.
4. The method of claim 2, further comprising:
and if the target shell strength is not qualified, strengthening the target position corresponding to the sensing structure with the unqualified strain value, and re-testing the target shell strength in the battery pack to be tested, wherein the target position comprises at least one, and the strengthening treatment comprises reinforcing rib treatment, thickened plate treatment and impact structure improvement treatment.
5. The method of claim 3, further comprising:
determining a free space of the target housing based on the target position, and disposing additional components inside the target housing.
6. The method of claim 2, further comprising, prior to the step of placing a pressurizing device in place of the target battery module at the target position of the target housing:
judging whether historical inspection is carried out on the battery pack to be inspected, which comprises the same target battery module type and the same target shell type;
if so, correspondingly processing the target shell according to the strengthening processing condition of the storage record, and placing the target battery module at the target position, so that the battery pack to be inspected can bear the bulging force of the target battery module under the condition of no inspection.
7. The method of claim 1, wherein the step of determining the target position of the target enclosure comprises:
performing simulation force application processing on the target shell to obtain a stress analysis result of the target shell, wherein the simulation force application processing comprises collision processing, vibration processing and impact processing;
and determining the target position of the target shell according to the stress analysis result.
8. A device for testing the strength of a battery pack shell, comprising:
the acquisition module is used for acquiring the model of a target battery module and the model of a target shell corresponding to the battery pack to be inspected;
the determination module is used for determining a target position of the target shell, placing a pressurizing device on the target position of the target shell instead of the target battery module, and arranging a sensing structure at the target position, wherein the target position is a position where the strength of the target shell cannot bear the possibility of applying a preset bulging force;
the force application module is used for applying a preset bulging force to the target position through the pressurizing device, wherein the preset bulging force corresponds to the model of the target battery module;
and the inspection module is used for comparing the strain value acquired by the sensing structure with the yield strength corresponding to the model of the target shell and inspecting the strength of the target shell in the battery pack to be inspected.
9. An electronic device comprising a memory and a processor, wherein the memory stores a computer program operable on the processor, and wherein the processor implements the steps of the method of any of claims 1 to 7 when executing the computer program.
10. A machine-readable storage medium having stored thereon machine-executable instructions which, when invoked and executed by a processor, cause the processor to carry out the steps of the method of any one of claims 1 to 7.
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