CN111929590A - System and method for testing thermal runaway and thermal runaway expansion of power battery pack - Google Patents
System and method for testing thermal runaway and thermal runaway expansion of power battery pack Download PDFInfo
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Abstract
The application relates to a test system and a test method for thermal runaway and thermal runaway expansion of a power battery pack. The embodiment of the invention provides a system and a method for testing thermal runaway and thermal runaway expansion of a power battery pack.
Description
Technical Field
The invention relates to the field of thermal runaway test of power battery packs, in particular to a system and a method for testing thermal runaway and thermal runaway expansion of a power battery pack.
Background
The power battery is becoming the focus of attention in the electric automobile industry, and the safety of the power battery is also becoming a project for key verification and investigation. The problems of casualties and property loss caused by spontaneous combustion of the electric automobile are that the nerves of the public are triggered all the time, and the time reserved for passengers after the battery pack is out of control is estimated is urgent. The ministry of industry and communications has brought the thermal runaway extension test project into the national standard mandatory project, and from this, the test of thermal runaway and thermal runaway extension of the power battery pack will determine whether the power battery product can be taken to the market admission pass certificate. Safety is not a little, and it is imperative to strengthen the test and supervision on the safety of the power battery pack.
The thermal runaway of the power battery pack has been researched early, and a plurality of related technologies of a test system and a simulation device exist, but the technologies do not specify the internal arrangement and method in the practical implementation process of the thermal runaway and thermal runaway extension test of the power battery pack, and for battery pack production enterprises and test organizations, it is necessary to design a simple, effective and low-cost test system and test method.
Disclosure of Invention
The embodiment of the invention provides a system and a method for testing thermal runaway and thermal runaway expansion of a power battery pack, and aims to solve the problem that a clear system and a method for testing thermal runaway and thermal runaway expansion of a power battery pack are lacked in the related technology.
In a first aspect, the invention provides a test system for thermal runaway and thermal runaway expansion of a power battery pack, which is characterized by comprising a heating module, a first temperature detection module, a time test module, a plurality of voltage detection modules, a plurality of second temperature detection modules, a calculation module and a judgment module, wherein the heating module is arranged among a plurality of battery monomers in the battery pack; the first temperature detection module is used for detecting the heating temperature of the heating module; the time testing module is used for detecting the heating time of the heating module; the plurality of voltage detection modules are used for detecting initial voltages of the plurality of battery monomers before heating and real-time voltages of the plurality of battery monomers after heating in different heating time; the plurality of second temperature detection modules are used for detecting the initial temperatures of the plurality of battery monomers and the real-time temperatures of the plurality of battery monomers in different heating time; the calculation module obtains a temperature rise rate and a voltage drop rate according to the obtained heating temperature, the obtained heating time, the initial temperatures and the initial voltages of the plurality of battery monomers, and the real-time temperatures and the real-time voltages when the battery monomers are heated for different times; the judging module judges the thermal expansion direction of the battery pack according to the acquired real-time temperatures of the battery monomers in different directions at the same heating time.
According to the first aspect, in a first possible implementation manner of the first aspect, the test system for thermal runaway and thermal runaway expansion of the power battery pack further includes a plurality of filling bodies, and the plurality of filling bodies are filled in gaps between the heating module and the plurality of battery cells.
According to the first aspect, in a second possible implementation manner of the first aspect, the test system for thermal runaway and thermal runaway expansion of the power battery pack further includes a heating trigger module electrically connected to the heating module, and configured to start or close a heating function of the heating module.
According to the first aspect, in a third possible implementation manner of the first aspect, the heating trigger module of the test system for thermal runaway and thermal runaway expansion of the power battery pack includes a central control board and a transformer, the central control board is electrically connected to the transformer, and the transformer is electrically connected to the heating module.
According to the first aspect, in a fourth possible implementation manner of the first aspect, the plurality of second temperature detection modules and the voltage detection module of the test system for thermal runaway and thermal runaway expansion of the power battery pack are set as a plurality of temperature sensing elements and voltage sensing elements which are arranged on an electric connection line, and the plurality of temperature sensing elements and the plurality of voltage sensing elements are respectively in communication connection with a central control board.
According to the first aspect, in a fifth possible implementation manner of the first aspect, the test system for thermal runaway and thermal runaway expansion of the power battery pack further includes an alarm module, and the alarm module is electrically connected to the central control board.
According to the first aspect, in a sixth possible implementation manner of the first aspect, the test system for thermal runaway and thermal runaway expansion of the power battery pack further includes a refrigeration module, and the refrigeration module is electrically connected to the central control board.
According to the first aspect, in a seventh possible implementation manner of the first aspect, the refrigeration module of the test system for thermal runaway and thermal runaway expansion of the power battery pack is set as a cooling pipeline or a semiconductor refrigeration piece.
In a second aspect, the invention further provides a method for testing thermal runaway and thermal runaway extension of a power battery pack, which includes the following steps:
acquiring the heating temperature and the heating time of a heating module, the initial temperature and the initial voltage of a plurality of battery monomers, and the real-time temperature and the real-time voltage of the plurality of battery monomers during heating;
and calculating the temperature drop rate and the voltage drop rate under different heating temperatures according to the heating temperature, the heating time, the initial voltage, the initial temperature, the real-time voltage and the real-time temperature when different battery monomers are in a heating state.
According to the second aspect, in a first possible implementation manner of the second aspect, the step of obtaining the heating temperature of the heating module, the initial temperatures and the initial voltages of the plurality of battery cells, and the real-time temperatures and the real-time voltages of the plurality of battery cells at different heating times; before the step, the method also comprises the following steps:
acquiring a heating trigger signal;
and controlling the heating module to heat according to the heating trigger signal.
The technical scheme provided by the invention has the beneficial effects that:
the embodiment of the invention provides a system and a method for testing thermal runaway and thermal runaway expansion of a power battery pack.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a block diagram of functional modules of a system according to an embodiment of the present invention;
FIG. 2 is a flowchart of a method of one embodiment of a testing method provided by an embodiment of the present invention;
fig. 3 is a flowchart of a method of another embodiment of the testing method according to the embodiment of the present invention.
In the figure: 100. a battery cell; 1. a heating module; 2. a second temperature; 3. a voltage detection module; 4. a calculation module; 5. a time testing module; 6. and a judging module.
Detailed Description
Reference will now be made in detail to the present embodiments of the invention, examples of which are illustrated in the accompanying drawings. While the invention will be described in conjunction with the specific embodiments, it will be understood that they are not intended to limit the invention to the embodiments described. On the contrary, it is intended to cover alternatives, modifications, and equivalents as may be included within the spirit and scope of the invention as defined by the appended claims. It should be noted that the method steps described herein may be implemented by any functional block or functional arrangement, and that any functional block or functional arrangement may be implemented as a physical entity or a logical entity, or a combination of both.
In order that those skilled in the art will better understand the present invention, the following detailed description of the invention is provided in conjunction with the accompanying drawings and the detailed description of the invention.
Note that: the example to be described next is only a specific example, and does not limit the embodiments of the present invention necessarily to the following specific steps, values, conditions, data, orders, and the like. Those skilled in the art can, upon reading this specification, utilize the concepts of the present invention to construct more embodiments than those specifically described herein.
Referring to fig. 1, the invention provides a test system for thermal runaway and thermal runaway expansion of a power battery pack, which is characterized by comprising a heating module 1, a first temperature detection module 2, a time test module 5, a plurality of voltage detection modules 3, a plurality of second temperature detection modules, a calculation module 4 and a determination module 6, wherein the heating module 1 is arranged among a plurality of battery cells 100 in the battery pack; the first temperature detection module 2 is used for detecting the heating temperature of the heating module 1; the time testing module 5 is used for detecting the heating time of the heating module 1; the plurality of voltage detection modules 3 are used for detecting initial voltages of the plurality of battery cells 100 before heating and real-time voltages of the plurality of battery cells 100 after heating at different heating times; a plurality of second temperature detection modules for detecting initial temperatures of the plurality of battery cells 100 and real-time temperatures at different heating times; the calculation module 4 obtains a temperature rise rate and a voltage drop rate according to the obtained heating temperature, the obtained heating time, the obtained initial temperatures and initial voltages of the plurality of battery cells 100, and the obtained real-time temperatures and real-time voltages at different heating times; the determination module 6 determines the thermal expansion direction of the battery pack according to the acquired real-time temperatures of the battery cells 100 in different directions at the same heating time.
As described above, according to the present invention, the real-time temperature and real-time voltage are sampled according to a preset time, for example, every 2 minutes or every 6 minutes. If the temperature is too fast or the pressure is too fast in the preset sampling time period, the temperature is adjusted to be a smaller time period.
As described above, according to the present invention, the calibration of the thermal runaway time parameter of the battery pack is achieved by acquiring the upper limit preset value and the lower limit preset value of the heated temperature of the battery cells in the battery pack, defining the earliest time when the thermal runaway of the battery cells 100 occurs through the time range in which the battery cells 100 in different orientations reach the upper limit of the heated temperature and the time range in which the battery cells 100 reach the lower limit preset value of the heated voltage.
In a preferred embodiment, the power battery pack thermal runaway and thermal runaway expansion test system further includes a plurality of filling bodies, the plurality of filling bodies are filled in gaps between the heating module 1 and the plurality of battery cells 100, and the filling bodies are used for simulating air content in a real power battery pack box body, so as to reduce the influence of the air content on thermal diffusion and realize the thermal runaway and thermal runaway expansion test under the extreme condition under the condition that the battery packs are most densely arranged. As described above, according to the present invention, the filling body is implemented as a sponge body, a cotton filler, or even as a plurality of steel balls, as long as the gap between the heating module 1 and the plurality of battery cells 100 can be filled and heated in a physical form to reduce heat diffusion.
In a preferred embodiment of the present application, the testing system for thermal runaway and thermal runaway expansion of a power battery pack further includes a heating triggering module and a control module, which are electrically connected to the heating module 1 and in communication connection with the control module, and are used to start or close the heating function of the heating module 1, and controllably start or close the heating function, so as to realize the function of ordered testing and avoid the occurrence of uncontrollable conditions caused by overheating in the testing stage.
In some embodiments, the heating trigger module of the test system for thermal runaway and thermal runaway expansion of the power battery pack comprises a central control board and a transformer, the central control board is electrically connected with the transformer, and the transformer is electrically connected with the heating module 1, so that the test system is convenient and simple to implement and low in cost.
In a preferred embodiment, the plurality of second temperature detection modules and the voltage detection module 3 of the testing system for thermal runaway and thermal runaway expansion of the power battery pack are set as a plurality of temperature sensing elements and voltage sensing elements which are arranged on the electrical connection line, the plurality of temperature sensing elements and the plurality of voltage sensing elements are respectively in communication connection with the central control panel, the arrangement cost is low, the implementation is convenient and flexible, the testing system can be flexibly matched according to the arrangement conditions of the battery cells 100 in different battery packs, and is used for testing the initial temperature, the initial voltage, the real-time temperature and the real-time voltage of the plurality of battery cells 100.
In a preferred embodiment, the system for testing thermal runaway and thermal runaway expansion of a power battery pack further includes an alarm module, the alarm module is electrically connected to the central control board, and the alarm module is configured to send an alarm signal to prompt a tester to give an early warning about temperature or a low warning about voltage drop to a lower limit value when the real-time temperature of the battery pack reaches the upper limit preset value of the heated temperature or the real-time voltage of the battery pack 100 reaches the lower limit preset value of the heated voltage according to comparison information between the real-time temperature and the real-time voltage of the battery pack 100 and the upper limit preset value of the heated temperature or the lower limit preset value of the heated voltage.
In a preferred embodiment, the test system for thermal runaway and thermal runaway expansion of the power battery pack further includes a refrigeration module, the refrigeration module is electrically connected to the central control board, and the refrigeration module is configured to perform refrigeration and cooling on the battery cell 100 in the battery pack according to comparison information about whether the obtained real-time temperature of the battery cell 100 and the real-time temperature of the battery cell 100 are within a preset temperature range, when the real-time temperature of the battery cell 100 is within the preset temperature range, so as to realize repeated testing and cyclic utilization of multiple tests on the battery cell 100 in the tested battery pack, reduce testing cost, and realize green and environment-friendly effects.
In a specific embodiment, the cooling module of the test system for thermal runaway and thermal runaway expansion of the power battery pack is set as a cooling pipeline or a semiconductor cooling plate. Preferably, the refrigeration module is realized as a semiconductor refrigeration piece, is convenient to arrange, does not seep liquid, and does not have error influence on the test result.
Based on the same invention idea, please refer to fig. 2, the invention further provides a method for testing thermal runaway and thermal runaway expansion of a power battery pack, comprising the following steps:
acquiring the heating temperature and the heating time of the heating module 1, the initial temperature and the initial voltage of the plurality of battery monomers 100, and the real-time temperature and the real-time voltage of the plurality of battery monomers 100 during heating;
and calculating the temperature drop rate and the voltage drop rate under different heating temperatures according to the heating temperature, the heating time, the initial voltage, the initial temperature, the real-time voltage and the real-time temperature when different battery monomers 100 are in a heating state.
In a preferred embodiment, please refer to fig. 3, wherein the "obtaining of the heating temperature of the heating module 1, the initial temperature and the initial voltage of the plurality of battery cells 100, and the real-time temperature and the real-time voltage of the plurality of battery cells 100 at different heating times" is described; before the step, the method also comprises the following steps:
acquiring a heating trigger signal;
and controlling the heating module 1 to heat according to the heating trigger signal.
Based on the same inventive concept, embodiments of the present invention also provide a computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, implements all or part of the method steps of the above-mentioned method.
The present invention can implement all or part of the processes of the above methods, and can also be implemented by using a computer program to instruct related hardware, where the computer program can be stored in a computer-readable storage medium, and when the computer program is executed by a processor, the steps of the above method embodiments can be implemented. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer readable medium may include: any entity or device capable of carrying computer program code, recording medium, U.S. disk, removable hard disk, magnetic disk, optical disk, computer Memory, Read-Only Memory (ROM), Random Access Memory (RAM), electrical carrier wave signals, telecommunications signals, software distribution media, and the like. It should be noted that the computer readable medium may contain other components which may be suitably increased or decreased as required by legislation and patent practice in jurisdictions, for example, in some jurisdictions, in accordance with legislation and patent practice, the computer readable medium does not include electrical carrier signals and telecommunications signals.
Based on the same inventive concept, an embodiment of the present invention further provides an electronic device, which includes a memory and a processor, where the memory stores a computer program running on the processor, and the processor executes the computer program to implement all or part of the method steps in the above method.
The Processor may be a Central Processing Unit (cpu), or may be other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field-Programmable gate Array (FPGA) or other Programmable logic device, discrete gate or transistor logic, discrete hardware components, or the like. The general purpose processor may be a microprocessor or the processor may be any conventional processor or the like, the processor being the control center of the computer device and the various interfaces and lines connecting the various parts of the overall computer device.
The memory may be used to store computer programs and/or modules, and the processor may implement various functions of the computer device by executing or executing the computer programs and/or modules stored in the memory, as well as by invoking data stored in the memory. The memory may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required by at least one function (e.g., a sound playing function, an image playing function, etc.); the storage data area may store data (e.g., audio data, video data, etc.) created according to the use of the cellular phone. In addition, the memory may include high speed random access memory, and may also include non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a Smart Memory Card (SMC), a Secure Digital (SD) Card, a flash memory Card (flash Card), at least one magnetic disk storage device, a flash memory device, or other volatile solid state storage device.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, server, or computer program product. Accordingly, 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, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, optical storage, and the like) having computer-usable program code embodied therein.
The present invention has been described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), servers and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams 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 apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, 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.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. The utility model provides a power battery package thermal runaway and thermal runaway extended test system which characterized in that includes:
the heating module is arranged among a plurality of battery monomers in the battery pack;
the first temperature detection module is used for detecting the heating temperature of the heating module;
the time testing module is used for detecting the heating time of the heating module;
the voltage detection modules are used for detecting initial voltages of the battery monomers before heating and real-time voltages of the battery monomers after heating in different heating time;
the plurality of second temperature detection modules are used for detecting the initial temperatures of the plurality of battery monomers and the real-time temperatures of the plurality of battery monomers in different heating time;
the calculation module is used for obtaining a temperature rise rate and a voltage drop rate according to the obtained heating temperature, the obtained heating time, the initial temperatures and the initial voltages of the plurality of battery monomers, and the real-time temperatures and the real-time voltages when the battery monomers are heated for different times;
and the judging module is used for judging the thermal expansion direction of the battery pack according to the acquired real-time temperatures of the battery monomers in different directions at the same heating time.
2. The power battery pack thermal runaway and thermal runaway extension test system of claim 1 further comprising a plurality of fillers filled in gaps between the heating module and the plurality of battery cells.
3. The system for testing thermal runaway and thermal runaway expansion of a power battery pack as claimed in claim 1, further comprising a heating trigger module and a control module electrically connected to the heating module for activating or deactivating the heating function of the heating module.
4. The system for testing thermal runaway and thermal runaway extension of a power battery pack as claimed in claim 1, wherein the heating trigger module comprises a central control board and a transformer, the central control board is electrically connected with the transformer, and the transformer is electrically connected with the heating module.
5. The system for testing thermal runaway and thermal runaway expansion of a power battery pack according to claim 1, wherein the plurality of second temperature detection modules and the plurality of voltage detection modules are arranged as a plurality of temperature sensing elements and a plurality of voltage sensing elements which are arranged on an electrical connection line, and the plurality of temperature sensing elements and the plurality of voltage sensing elements are respectively in communication connection with a central control panel.
6. The system for testing thermal runaway and thermal runaway extension of a power battery pack as claimed in claim 5, further comprising an alarm module for electrically connecting to the central control panel.
7. The system for testing thermal runaway and thermal runaway propagation of a power battery pack as claimed in claim 6, further comprising a refrigeration module for electrically connecting to the central control panel.
8. The system for testing thermal runaway and thermal runaway extension of a power battery pack according to claim 7, wherein the refrigeration module is provided as a cooling pipeline or a semiconductor refrigeration chip.
9. A method for testing thermal runaway and thermal runaway expansion of a power battery pack is characterized by comprising the following steps:
acquiring the heating temperature and the heating time of a heating module, the initial temperature and the initial voltage of a plurality of battery monomers, and the real-time temperature and the real-time voltage of the plurality of battery monomers during heating;
and calculating the temperature drop rate and the voltage drop rate under different heating temperatures according to the heating temperature, the heating time, the initial voltage, the initial temperature, the real-time voltage and the real-time temperature when different battery monomers are in a heating state.
10. The method as set forth in claim 9, wherein the "acquiring of the heating temperature of the heating module, the initial temperature and the initial voltage of the plurality of battery cells, the real-time temperature and the real-time voltage of the plurality of battery cells at different heating times; before the step, the method also comprises the following steps:
acquiring a heating trigger signal;
and controlling the heating module to heat according to the heating trigger signal.
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| CN113030737A (en) * | 2021-04-30 | 2021-06-25 | 重庆长安新能源汽车科技有限公司 | Power battery pulse heating reliability test method |
| CN113917344A (en) * | 2021-09-08 | 2022-01-11 | 东风时代(武汉)电池系统有限公司 | Power battery thermal runaway test protection method, power battery device and system |
| CN114383708A (en) * | 2021-12-23 | 2022-04-22 | 东莞市巴能检测技术有限公司 | Thermal runaway data acquisition method and acquisition analysis system of lithium ion battery |
| CN116338473A (en) * | 2023-05-30 | 2023-06-27 | 苏州精控能源科技有限公司 | Cylindrical lithium battery testing method, device, medium and equipment for thermal runaway diffusion |
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