CN218866062U - Lithium battery safety detection early warning intelligent device - Google Patents
Lithium battery safety detection early warning intelligent device Download PDFInfo
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- CN218866062U CN218866062U CN202221009346.4U CN202221009346U CN218866062U CN 218866062 U CN218866062 U CN 218866062U CN 202221009346 U CN202221009346 U CN 202221009346U CN 218866062 U CN218866062 U CN 218866062U
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Abstract
The utility model discloses a lithium cell safety inspection early warning intelligent device in advance belongs to lithium cell thermal runaway detection technology field, and aim at solves the problem that current lithium cell thermal runaway check out test set early warning time is limited, application scope is little, have the false retrieval. It includes MCU master control analysis module, MCU master control analysis module signal connection has early warning signal control output module in advance and early warning signal bus output module in advance, MCU master control analysis module still signal connection has unit lithium cell strain capacity detection module, early warning signal control output module includes field effect transistor control circuit in advance, field effect transistor control circuit signal connection has fire extinguishing agent injection apparatus, early warning signal bus output module signal connection system management platform in advance, MCU master control analysis module still electricity is connected with power input module. The utility model is suitable for a lithium cell safety inspection early warning intelligent device in advance.
Description
Technical Field
The utility model belongs to the technical field of lithium cell thermal runaway detects, concretely relates to lithium cell safety inspection early warning intelligent device in advance.
Background
The safety detection of the existing lithium battery generally comprises the steps of monitoring the voltage, the current and the temperature of two electrodes on a lithium battery electrode of a unit, comparing acquired information, and defaulting thermal runaway of the lithium battery once the acquired information is suddenly changed, wherein the detection mode is suitable for partial thermal runaway detection of the lithium battery, such as internal short circuit caused by puncture and severe collision of the lithium battery, and has individuality and particularity; meanwhile, the detection mode has the possibility of false detection, such as short circuit and electric leakage of an electrical connection system between lithium battery units, so that the detection mode does not represent the general characteristics of lithium battery thermal runaway, has particularity, individuality and no universality, and is more difficult to realize trend analysis, trend prejudgment, lithium battery thermal runaway early warning and the like on the lithium battery thermal runaway.
At present, the market also has a safety detection and early warning for lithium batteries, namely detection of thermal runaway characteristic escape gases (such as CO and H2) of lithium batteries, but the escape characteristic gases refer to characteristic gases (such as CO and H2) which are leaked through a pressure valve of a unit lithium battery or escape from the outer package of the unit lithium battery due to breakage, and although the detection mode is more accurate and has early warning characteristics than detection of voltage, current and bipolar temperature sudden change on an electrode, the detection mode also has specificity and individuality, and also does not have universality, particularly the early warning time is very limited, and even seconds are taken as an early warning unit.
Through voltage, electric current and two pole temperatures on the monitoring unit lithium cell electrode, the sudden change data of detecting unit lithium cell like this to realize that there is following problem in the safety inspection early warning mode of lithium electricity:
1. the lithium battery has individuality and particularity, is effective for internal short circuit caused by lithium battery puncture and violent collision, and is not practical for other lithium electric heating out-of-control conditions.
2. The possibility of false detection exists, for example, voltage, current and two-pole temperature sudden change caused by short circuit, electric leakage and the like of an electrical connection system between lithium battery units cannot be effectively identified and eliminated.
3. The system does not have the function of early warning and generally occurs in thermal runaway.
4. The method does not have the universal characteristic of detecting various thermal runaway of the lithium battery.
Through monitoring unit lithium cell thermal runaway characteristic escape gas, such safety inspection early warning mode has following problem:
1. the method has individuality and particularity, is effective in detecting the characteristic gas generated by leakage of the pressure valve of the unit lithium battery or breakage and escape of the outer package of the unit lithium battery, and is not practical for thermal runaway of other types of unit lithium batteries.
2. The early warning time is very limited, even taking seconds as an early warning unit.
3. The method does not have the universal characteristic of detecting various thermal runaway of the lithium battery.
4. The working temperature is narrow, the maximum working temperature of the lithium battery is not more than 60 ℃ in general, and the lithium battery has limitation on the high environment temperature caused by thermal runaway.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a: the utility model provides a lithium cell safety inspection early warning intelligent device in advance, solves the problem that current lithium cell thermal runaway check detecting equipment early warning time is limited, application scope is little, have the false retrieval.
The utility model adopts the technical scheme as follows:
the utility model provides a lithium cell safety inspection intelligent device that gives early warning in advance, includes MCU master control analysis module, MCU master control analysis module electric signal connection has early warning signal control output module and early warning signal bus output module in advance, MCU master control analysis module still electric signal connection has unit lithium cell strain capacity detection module, unit lithium cell strain capacity detection module is including pasting the unit lithium cell strain gauge on unit lithium cell surface, unit lithium cell strain gauge electricity is connected with constant current power supply, unit lithium cell strain gauge electric signal connection has AD sampling circuit, AD sampling circuit and MCU master control analysis module electric signal connection, early warning signal control output module includes field effect transistor control circuit in advance, field effect transistor control circuit electric signal connection has fire extinguishing agent injection apparatus, early warning signal bus output module signal connection system management platform in advance, MCU master control analysis module still electricity is connected with power input module.
Further, the early warning signal bus output module comprises an SPI (serial peripheral interface), a CAN (controller area network) bus interface, an RS422 bus interface and an RS485 bus interface.
Further, the power input module is a DC9-36V power input module.
Furthermore, the working temperature range of the unit lithium battery strain gauge is-40 ℃ to 220 ℃.
Further, the unit lithium battery strain gauge is a resistance strain gauge.
To sum up, owing to adopted above-mentioned technical scheme, the beneficial effects of the utility model are that:
1. the utility model discloses in, paste a unit lithium cell foil gage like paper is thin at unit lithium cell casing (hard package or soft package) and carry out all-weather incessant detecting element lithium cell casing deformation parameter, unit lithium cell foil gage presents different resistance along with stress variation, through applying fixed constant current power supply and sampling through AD sampling circuit, and give MCU master control analysis module with the sample value transmission, MCU master control analysis module is according to sample value analysis and the unit lithium cell thermal runaway situation of prejudgement, the rethread early warning signal bus output module warns this unit lithium cell health situation in advance to system management platform, thereby through changing early warning fault unit lithium cell in advance, reach the safety protection of lithium cell. In addition, the MCU master control analysis module can instantly release driving voltage through the field effect tube control circuit according to the worst case result of early warning analysis, control the fire extinguishing agent injection device to inject the fire extinguishing agent, and effectively restrain and control the thermal runaway unit lithium battery. The early warning of the thermal runaway is combined with the automatic treatment of the thermal runaway on site, so that the safety protection of the lithium battery is ensured.
2. The utility model discloses in, MCU master control analysis module exports four kinds of bus interfaces respectively through early warning signal bus output module with the result of analysis early warning in advance: SPI interface, CAN bus interface, RS422 bus interface, RS485 bus interface, communication protocol open for the user inserts corresponding system management platform, then be convenient for the user according to early warning result application system management platform carry out various early warning disposals: such as power input and output cut-off, acousto-optic prompt early warning and replacement of the lithium battery of the early warning unit.
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In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and that for those skilled in the art, other relevant drawings can be obtained according to the drawings without inventive effort, wherein:
FIG. 1 is a block diagram of the overall structure of the present invention;
fig. 2 is an overall schematic block diagram of the present invention.
Detailed Description
To make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the attached drawings in the embodiments of the present invention are combined to clearly and completely describe the technical solution in the embodiments of the present invention, and obviously, the described embodiments are part of the embodiments of the present invention, rather than all embodiments. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
It should be noted that: reference numerals and letters designate similar items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, or the directions or positional relationships that the products of the present invention are usually placed when used, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element indicated must have a specific direction, be constructed and operated in a specific direction, and therefore should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another, and are not to be construed as indicating or implying relative importance.
Furthermore, the terms "horizontal", "vertical" and the like do not imply that the components are required to be absolutely horizontal or pendant, but rather may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; mechanical connection or electrical connection can be realized; the two original pieces can be directly connected or indirectly connected through an intermediate medium, or the interiors of the two original pieces are communicated. The specific meaning of the above terms in the present invention can be understood as a specific case by those skilled in the art.
The utility model provides a lithium cell safety inspection intelligent device that gives early warning in advance, includes MCU master control analysis module, MCU master control analysis module electric signal connection has early warning signal control output module and early warning signal bus output module in advance, MCU master control analysis module still electric signal connection has unit lithium cell strain capacity detection module, unit lithium cell strain capacity detection module is including pasting the unit lithium cell strain gauge on unit lithium cell surface, unit lithium cell strain gauge electricity is connected with constant current power supply, unit lithium cell strain gauge electric signal connection has AD sampling circuit, AD sampling circuit and MCU master control analysis module electric signal connection, early warning signal control output module includes field effect transistor control circuit in advance, field effect transistor control circuit electric signal connection has fire extinguishing agent injection apparatus, early warning signal bus output module signal connection system management platform in advance, MCU master control analysis module still electricity is connected with power input module.
Further, the early warning signal bus output module comprises an SPI interface, a CAN bus interface, an RS422 bus interface and an RS485 bus interface.
Further, the power input module is a DC9-36V power input module.
Furthermore, the working temperature range of the unit lithium battery strain gauge is-40 ℃ to 220 ℃.
Further, the unit lithium battery strain gauge is a resistance strain gauge.
The utility model discloses in the implementation, because lithium cells such as lithium iron phosphate, ternary lithium, still lithium manganate exist with the free form of lithium cell. In order to use and take safety into consideration, the single lithium battery is packaged (such as soft packaging or hard packaging), and meanwhile, a pressure valve is designed, so that the packaging and safety guarantee measures make the thermal runaway of the lithium battery more difficult, and on the other hand, the thermal runaway of the lithium battery is a process which becomes qualitative change due to quantitative change, and researches and analysis show that the mechanism makes the maximum commonality of the thermal runaway of the lithium battery: no matter the single lithium battery is soft-packaged or hard-packaged, the external packaging of the single lithium battery has a deformation process which breaks through a pressure valve before thermal runaway. In the working process of the unit lithium battery, the chemical electrolyte reaction can be generated inside the unit lithium battery, when the internal part has the tendency of thermal runaway, the pressure is gradually released, because the shell (hard package or soft package) and the pressure valve are reasons, the thermal runaway can not occur at once, when the unit lithium battery shell (hard package or soft package) can generate very small deformation, the deformation is in direct proportion to the internal thermal runaway tendency, so that according to the general commonality of the thermal runaway of the lithium battery, a unit lithium battery strain foil which is as thin as paper is pasted on the unit lithium battery shell (hard package or soft package) to continuously detect the deformation parameters of the unit lithium battery shell in all weather, the unit lithium battery strain gauge presents different resistance values along with stress changes, sampling is carried out by applying a fixed constant current power supply and an A/D sampling circuit, sampling values are transmitted to an MCU master control analysis module, the MCU master control analysis module carries out modeling according to the sampling values and in combination with big data, analysis and database comparison, the thermal runaway condition of the unit lithium battery is analyzed and pre-judged, the health condition of the unit lithium battery is warned to a system management platform in advance through an early warning signal bus output module, the early warning time of the lithium battery is guaranteed to be achieved according to the day, the lithium battery is achieved according to the week or even the month, and the safety protection of the lithium battery is achieved by replacing an early warning fault unit lithium battery in advance. In addition, the MCU master control analysis module can release driving voltage instantly through a field effect tube control circuit according to the worst condition result of early warning analysis, control the fire extinguishing agent injection device to inject the fire extinguishing agent, and effectively restrain and control the thermal runaway unit lithium battery. The early warning of the thermal runaway is combined with the automatic treatment of the thermal runaway site, so that the safety protection of the lithium battery is ensured.
The MCU master control analysis module respectively outputs four bus interfaces through the early warning signal bus output module according to the analysis and early warning results: SPI interface, CAN bus interface, RS422 bus interface, RS485 bus interface, communication protocol open for the corresponding system management platform of user access, because early warning time is longer (several days, several weeks even several months), the user of then being convenient for carries out various early warnings according to early warning result application system management platform and deals with: such as power input and output cut-off, acousto-optic prompt early warning and replacement of the lithium battery of the early warning unit. Meanwhile, the system management platform can also collect detected data, then perform big data analysis, modeling and machine learning, and optimize the early warning precision of the MCU master control analysis module.
The working temperature range of the unit lithium battery strain gauge is wider at-40-220 ℃, and the unit lithium battery strain gauge can perfectly adapt to the detection of high-temperature environment such as thermal runaway of a lithium battery.
Example 1
The utility model provides a lithium cell safety inspection intelligence device that early warns in advance, includes MCU master control analysis module, MCU master control analysis module electric signal connection has early warning signal control output module and early warning signal bus output module in advance, MCU master control analysis module still electric signal connection has unit lithium cell strain capacity detection module, unit lithium cell strain capacity detection module is including pasting the unit lithium cell foil gage on unit lithium cell surface, unit lithium cell foil gage electricity is connected with constant current power supply, unit lithium cell foil gage electric signal connection has AD sampling circuit, AD sampling circuit and MCU master control analysis module electric signal connection, early warning signal control output module includes field effect transistor control circuit in advance, field effect transistor control circuit electric signal connection has fire extinguishing agent injection apparatus, early warning signal bus output module signal connection system management platform in advance, MCU master control analysis module still electricity is connected with power input module.
Example 2
On the basis of embodiment 1, the early warning signal bus output module comprises an SPI interface, a CAN bus interface, an RS422 bus interface and an RS485 bus interface.
Example 3
On the basis of the above embodiment, the power input module is a DC9-36V power input module.
Example 4
On the basis of the embodiment, the working temperature range of the unit lithium battery strain gauge is-40-220 ℃.
Example 5
On the basis of the embodiment, the unit lithium battery strain gauge is a resistance strain gauge.
The above is the embodiment of the present invention. The foregoing is the preferred embodiments of the present invention, and if they are not obviously contradictory or are not assumed to be obvious, all the preferred embodiments can be combined and used by any superposition, and the specific parameters in the embodiments are only for clearly representing the verification process of the present invention, and are not used to limit the patent protection scope of the present invention, which is still subject to the claims, and all the equivalent structural changes made by applying the contents of the specification and the drawings of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. The utility model provides a lithium cell safety inspection intelligence device that warns in advance, its characterized in that, includes MCU master control analysis module, MCU master control analysis module electric signal connection has early warning signal control output module and early warning signal bus output module in advance, MCU master control analysis module still electric signal connection has unit lithium cell strain capacity detection module, unit lithium cell strain capacity detection module is including pasting the unit lithium cell strain gauge on unit lithium cell surface, unit lithium cell strain gauge electricity is connected with constant current power supply, unit lithium cell strain gauge electric signal connection has AD sampling circuit, AD sampling circuit and MCU master control analysis module electric signal connection, early warning signal control output module includes field effect transistor control circuit in advance, field effect transistor control circuit electric signal connection has fire extinguishing agent injection apparatus, early warning signal bus output module signal connection system management platform in advance, MCU master control analysis module still is connected with power input module electrically.
2. The intelligent early warning device for safety detection of lithium batteries according to claim 1, wherein the early warning signal bus output module comprises an SPI interface, a CAN bus interface, an RS422 bus interface, and an RS485 bus interface.
3. The intelligent early warning device for lithium battery safety detection according to claim 1, wherein the power input module is a DC9-36V power input module.
4. The intelligent device for early warning of safety detection of lithium batteries according to claim 1, wherein the working temperature range of the strain gauge of the unit lithium battery is-40 ℃ to 220 ℃.
5. The intelligent device for early warning of safety detection of lithium batteries according to claim 1, wherein the strain gauge of the unit lithium battery is a resistance strain gauge.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202221009346.4U CN218866062U (en) | 2022-04-28 | 2022-04-28 | Lithium battery safety detection early warning intelligent device |
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| CN202221009346.4U CN218866062U (en) | 2022-04-28 | 2022-04-28 | Lithium battery safety detection early warning intelligent device |
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| CN218866062U true CN218866062U (en) | 2023-04-14 |
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