CN217156760U - Power battery with expansion force detection function and safety monitoring system thereof - Google Patents
Power battery with expansion force detection function and safety monitoring system thereof Download PDFInfo
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- CN217156760U CN217156760U CN202220161940.9U CN202220161940U CN217156760U CN 217156760 U CN217156760 U CN 217156760U CN 202220161940 U CN202220161940 U CN 202220161940U CN 217156760 U CN217156760 U CN 217156760U
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The utility model discloses a power battery with expansion force detection function, which comprises a shell, at least one electric core arranged in the shell, and an expansion force detection module for detecting the pressure distribution of the preset area of the electric core; the expansion force detection module comprises a pressure distribution sensor and a collector electrically connected with the pressure distribution sensor; the pressure distribution sensor is a film type pressure sensor array arranged in a preset area range of the outer wall of the battery cell, or the pressure distribution sensor is composed of a plurality of film type pressure sensing monomers arranged in the preset area range of the outer wall of the battery cell. The utility model discloses still further disclose a power battery safety monitoring system. The utility model discloses the expansive force that accessible film formula pressure distribution sensor obtained electric core surface distributes and the situation of change, monitors power battery's safety and health more accurately.
Description
Technical Field
The invention relates to the technical field of power battery safety detection, in particular to a power battery with an expansion force detection function and a safety detection system thereof.
Background
With the integration of the new energy automobile into the tide, the traditional automobile factories are also accelerated to arrange in the direction of new energy. At present, a common new energy automobile usually adopts a rechargeable battery to provide power, however, spontaneous combustion explosion accidents caused by the fact that the power battery is connected with three batteries are caused, the problems of safety and stability of the new energy automobile battery are pushed to an air outlet in public opinion, so that the internal pain is caused, and the safety problem is paid more and more attention by many people. At present, the health state detection of common power batteries generally focuses on the dimensions of temperature, current and voltage, chemical gas detection and the like, and the comprehensive detection management is carried out on the running state of the power batteries. However, the safety detection performed from these dimensions is still insufficient, and the potential safety hazard cannot be discovered in time.
In the operation process of the power battery, a relation exists between a pressure signal on the surface of the battery core and a physical and chemical signal in the battery core, and the detection of the expansive force on the surface of the battery core is beneficial to monitoring and analyzing the problems of lithium ion embedding phase change, lithium precipitation, gas generation, thermal runaway and the like in the battery core, so that the health condition of the battery core is more accurately monitored. The existing power battery health state monitoring system introducing pressure detection can only carry out single-point pressure detection on the surface of a battery core generally, but because the expansion factors of the battery are more, and the expansion direction and the expansion force change randomly and variably, the expansion of the battery is detected only through a single point, and the phenomena of missing detection or inaccurate detection result often exist.
SUMMERY OF THE UTILITY MODEL
In order to solve the above problem, the utility model discloses a power battery with inflation power detects function, the inflation power that accessible film formula pressure distribution sensor acquireed electric core surface distributes and the situation of change. The utility model discloses still further disclose a power battery safety monitoring system, can monitor power battery's safety and health more accurately based on the detection of expansibility.
The technical scheme of the utility model includes:
the first scheme is as follows: a power battery with an expansion force detection function mainly comprises a shell, at least one battery cell arranged in the shell, and an expansion force detection module used for detecting the pressure distribution of a preset area of the battery cell; the expansion force detection module comprises a pressure distribution sensor and a collector electrically connected with the pressure distribution sensor; the pressure distribution sensor is a film type pressure sensor array arranged in a preset area range of the outer wall of the battery cell, or the pressure distribution sensor is composed of a plurality of film type pressure sensing monomers arranged in the preset area range of the outer wall of the battery cell.
As a preferred aspect, the pressure distribution sensor is further configured to: changing at least one electrical parameter based on a change in the magnitude of the applied pressure, the collector further configured to: and calculating real-time pressure distribution data according to the real-time electrical parameters transmitted by the pressure distribution sensor.
Preferably, the electrical parameter is piezoelectric, piezoresistive, capacitive or triboelectric.
As a preferred scheme, the power battery further comprises an alarm module in communication connection with the collector; the collector also stores standard pressure distribution data and a safety threshold value of a preset area; the alarm module is used for sending out an alarm signal when the difference between the real-time pressure distribution data and the standard pressure distribution data exceeds a safety threshold value.
As a preferable scheme, the pressure distribution sensor includes a pressure-sensitive functional film and an electrode film which are stacked, and the pressure-sensitive functional film is electrically connected with the collector through the electrode film.
Preferably, the cells have a plurality of pieces, and the pressure distribution sensor is arranged between adjacent cells or between a cell and a housing.
As a preferable scheme, the pressure distribution sensor is attached to the outer wall of the battery core in a sticking mode.
Preferably, the thin film type pressure sensor array covers at least one third of the preset area of the battery cell; or, the plurality of film type pressure sensing monomers cover at least one third of the preset area of the battery cell.
Scheme II: the power battery safety monitoring system comprises the power battery with the expansion force detection function in any one of the first scheme and the preferred scheme, and a health state monitoring module in communication connection with the battery core, wherein the health state monitoring module is used for analyzing and judging the health condition of the power battery according to real-time pressure distribution data acquired from the power battery.
As a preferable scheme, the power battery safety monitoring system further comprises one or more of a temperature detection module, a current and voltage detection module and a chemical gas detection module which are in communication connection with the health state monitoring module; the temperature detection module comprises a temperature sensor arranged on the battery cell and is used for acquiring the heating temperature of the battery cell and transmitting the heating temperature to the health state monitoring module; the current and voltage detection module is used for acquiring charge and discharge current, current voltage and potential data of the battery cell and transmitting the data to the health state monitoring module; the chemical gas detection module is used for detecting the concentration of chemical gas in the power battery and transmitting the chemical gas to the health state monitoring module.
Based on the technical scheme, the utility model discloses following technological effect has:
the utility model discloses directly adhere to pressure distribution sensor on electric core outer wall, the bulging force distribution and the situation of change between real time monitoring electricity core and electric core or electricity core and the power battery shell. And because the film type pressure distribution sensor is very thin, the appearance structure of the conventional power battery cell does not need to be changed, the appearance structure of the shell of the power battery does not need to be changed, the film type pressure distribution sensor can be directly attached to be used, and the film type pressure distribution sensor has higher practicability and universality. Meanwhile, the pressure distribution sensor can obtain the overall expansion force distribution change situation of the preset area, the maximum value of the expansion force in the preset area can be pre-judged in advance through the overall expansion force distribution change situation of the preset area, meanwhile, the position of the maximum value of the expansion force in the preset area can be accurately positioned, further, the pre-judgment and detection of the expansion force of the battery core can be accurately and efficiently realized, meanwhile, the position of the maximum expansion force on the battery core can be accurately positioned, and great convenience is provided for later maintenance and replacement.
The utility model discloses a power battery safety monitoring system is through the power dimension of introducing to fuse real time monitoring data such as temperature, current-voltage, chemical gas, can synthesize the state of health of analysis judgement battery more accurately, in time effective early warning.
Drawings
FIG. 1 is a schematic diagram of a diaphragm pressure distribution sensor;
FIG. 2 is a schematic diagram of a power battery;
FIG. 3 is a schematic diagram of another power battery;
fig. 4 is a schematic structural diagram of a power battery safety monitoring system.
Detailed Description
The technical solution of the present invention will be further explained with reference to the accompanying drawings and specific embodiments.
With reference to fig. 1 to 3, embodiment 1 discloses a power battery with an expansion force detection function, which mainly includes a casing 1, a plurality of battery cells 2 arranged inside the casing 1, and a plurality of expansion force detection modules, where each expansion force detection module mainly includes a pressure distribution sensor 3 and a collector 4. The pressure distribution sensor 3 may be disposed between adjacent electric cores 2 or between the electric core 2 and the casing 1, and fixed on the outer wall of the electric core 2 by means of pasting or the like.
Referring to fig. 1, the pressure distribution sensor 3 is mainly composed of an upper layer and a lower layer of flexible and bendable film material, the upper layer is a pressure-sensitive functional film 31, and the lower layer is an electrode film 32. The pressure distribution sensor 3 can specifically adopt a resistance type pressure sensor, when the sensor is pressed, the upper layer film and the lower layer film are contacted, and the contact area of the upper layer film and the lower layer film is changed along with the change of the pressure, so that the electrode end generates the change of the electrical impedance signal quantity generated along with the change of the pressure. As an embodiment, the pressure distribution sensor may be a film type pressure sensing array disposed on the outer wall of the cell, that is, it is a whole film disposed on the outer wall of the cell; or the pressure distribution sensor is composed of a plurality of thin film type pressure sensing monomers which are arranged in an array mode and are arranged in the range of the preset area of the outer wall of the battery cell.
As shown in fig. 2, as an embodiment, a thin film type pressure sensor array may be provided, and attached to a region where the battery cell is most likely to expand, that is, a detection region preset in advance, and the battery cell is detected by the thin film type pressure sensor array, because the thin film type pressure sensor array is a whole thin film arranged on the preset region of the battery cell, it may detect the magnitude of the expansion force of each point in the region covered by the thin film type pressure sensor array in the preset region when the battery cell expands in real time, and may obtain the expansion force variation curve of each point by analyzing the expansion force of each point in the preset region, and further may obtain the expansion force distribution variation condition of the whole preset region, and may previously determine the maximum value of the expansion force in the preset region by the expansion force distribution variation condition of the whole preset region, and may accurately locate the position of the maximum value of the expansion force in the preset region, therefore, the battery core expansion force can be accurately and efficiently pre-judged and detected through the thin film type pressure sensor array, and meanwhile, the position of the maximum expansion force on the battery core can be accurately positioned, so that great convenience is provided for later maintenance and replacement. The utility model discloses do not specifically prescribe a limit to the area of presetting the region that film formula pressure sensor array covered, film formula pressure sensor array can cover the third of presetting the region, also can cover the half of presetting the region, can also cover all regions of presetting the region. Specifically, the shape and size of the thin film pressure sensor array are adapted to the shape and size of a preset detection area on the outer wall of the battery cell 2. The size of the preset detection area is mainly determined by the size of the area on the battery cell, which is most prone to swelling, and specific use requirements.
As another embodiment, as shown in fig. 3, a plurality of thin film pressure sensing units may be disposed, and the plurality of thin film pressure sensing units are attached to several regions of the battery cell, where expansion is most likely to occur, in an array manner, so as to simultaneously detect the preset region of the battery cell. Specifically, the plurality of thin film type pressure sensing monomers respectively detect the expansion force of the corresponding position, the collector integrates the detection result, and the plurality of thin film type pressure sensing monomers are attached to the preset region of the electric core in an array arrangement mode, so that the expansion force change curves of all points in the preset region can be obtained by linearly fitting the detection result provided by the plurality of thin film type pressure sensing monomers, the overall expansion force distribution change condition of the preset region can be obtained, the maximum value of the expansion force in the preset region can be pre-judged in advance through the overall expansion force distribution change condition of the preset region, and meanwhile, the position of the maximum value of the expansion force on the preset region can be accurately positioned. Similarly, the utility model discloses do not specifically prescribe a limit to the area of the predetermined region that many thin film formula pressure sensing monomers covered, can cover the third of predetermineeing the region, also can cover the half of predetermineeing the region, can also cover all regions of predetermineeing the region. The number and the distribution form of the film type pressure sensing monomers are mainly determined by the shape and the size of a preset detection area of the battery cell 2, the collector 4 of the film type pressure sensing monomers can pre-store standard pressure distribution data according to the electrical impedance value of the initial state of the pressure distribution sensor 3, when the pressure distribution sensor is subjected to the expansion pressure of the battery cell 2, the output electrical impedance value can change, and the collector 4 can calculate real-time pressure distribution data according to the received electrical impedance value. From this, the surface pressure distribution data in the electric core course of work that accessible inflation force detection module detected accurately detects the circumstances that electric core took place the inflation change on electric core surface in the course of work to can specifically predetermine data such as the inflation force distribution value of detection area, inflation force rate of change.
In other embodiments, the pressure distribution sensor may also be a piezoelectric sensor, a capacitive sensor, an ionization sensor, or a triboelectric sensor. When the pressure distribution sensor 3 is subjected to the expansion pressure of the battery core 2, the output piezoelectric, capacitance or triboelectric and other electrical parameters change, and the collector 4 can calculate real-time pressure distribution data according to the received real-time electrical parameters.
In other embodiments, an alarm module may be further provided, the alarm module is in communication connection with the collector 4, and standard pressure distribution data and a pressure threshold of a preset area are prestored in the collector 4. When the pressure difference value of any one position in the real-time pressure distribution data and the standard pressure distribution data of the preset detection area calculated by the collector 4 is greater than the pressure threshold value, the alarm module sends an alarm signal to prompt a user.
On this basis of course, the utility model discloses still can combine real time monitoring data such as temperature, current-voltage, chemical gas, carry out analysis and judgement to the bulging force of electricity core and temperature, charge-discharge process etc. and intelligent judgement electricity core and whole power battery's health condition, early warning potential safety hazard in advance.
As shown in fig. 4, embodiment 2 discloses a power battery safety monitoring system, which mainly comprises the power battery with the swelling force detection function described in embodiment 1, and a battery health state monitoring module, wherein the battery health state monitoring module is in communication connection with a collector 4 in the power battery.
Further, the system further comprises one or more of a temperature detection module, a current-voltage detection module and a chemical gas detection module. The temperature detection module mainly realizes the heating temperature detection of the power battery through a temperature sensor integrated on the power battery; the current and voltage detection module mainly detects data such as charging and discharging current, current voltage, potential and the like of each battery cell through a current and voltage sensor; when steel-clad electricity core internal pressure is too big, lead to the broken valve of pressure protection valve, can release chemical gas, chemical gas detection module accessible chemical gas sensor detects whether there is chemical gas to appear, detects whether broken valve of electricity core.
Battery health status monitoring module and above-mentioned detection module communication connection, the expansive force distribution data of receiving the expansive force detection module feedback, then fuse temperature detection module, the temperature of current-voltage detection module and chemical gas detection module conveying, current-voltage, the data of multidimension such as chemical gas concentration, the expansive force to electric core, the temperature, the comprehensive analysis judgement is carried out to charge-discharge process etc., and then reachs the health condition of electric core, and can further upload the health condition data to power battery BMS master control, thereby make effectual reply and handle, can in time early warning to the problem that relates to power battery potential safety hazard.
Finally, it should be noted that, although the embodiments of the present invention have been described above with reference to the accompanying drawings, the present invention is not limited to the above-mentioned embodiments and application fields, and the above-mentioned embodiments are only illustrative and instructive, but not limiting. Those skilled in the art, having the benefit of this disclosure, may effect numerous modifications thereto without departing from the scope of the invention as defined by the claims.
Claims (8)
1. A power battery with an expansion force detection function is characterized by comprising a shell, at least one battery cell arranged in the shell, and an expansion force detection module for detecting the pressure distribution of a preset area of the battery cell; the expansion force detection module comprises a pressure distribution sensor and a collector electrically connected with the pressure distribution sensor; the pressure distribution sensor is a film type pressure sensor array arranged in a preset area range of the outer wall of the battery cell, or the pressure distribution sensor is composed of a plurality of film type pressure sensing monomers arranged in the preset area range of the outer wall of the battery cell.
2. The power cell of claim 1, wherein the pressure profile sensor is further configured to: changing at least one electrical parameter based on a change in the magnitude of the applied pressure, the collector further configured to: and calculating real-time pressure distribution data according to the real-time electrical parameters transmitted by the pressure distribution sensor.
3. The power cell of claim 2, wherein the electrical parameter is piezoelectric, piezoresistive, capacitive, or triboelectric.
4. The power battery of claim 2, further comprising an alarm module in communicative connection with the collector; the collector also stores standard pressure distribution data and a safety threshold value of a preset area; the alarm module is used for sending out an alarm signal when the difference between the real-time pressure distribution data and the standard pressure distribution data exceeds a safety threshold value.
5. The power battery according to claim 1, wherein the pressure distribution sensor comprises a pressure-sensitive functional film and an electrode film which are stacked, and the pressure-sensitive functional film is electrically connected with the collector through the electrode film.
6. The power battery of claim 1, wherein the cells have a plurality of pieces, and the pressure distribution sensor is disposed between adjacent cells or between a cell and a housing.
7. The power battery of claim 1, wherein the pressure distribution sensor is attached to the outer wall of the cell by means of adhesive.
8. The power battery of claim 1, wherein the thin film pressure sensor array covers at least one third of the predetermined cell area; or, the plurality of film type pressure sensing monomers cover at least one third of the preset area of the battery cell.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202220161940.9U CN217156760U (en) | 2022-01-21 | 2022-01-21 | Power battery with expansion force detection function and safety monitoring system thereof |
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| CN202220161940.9U CN217156760U (en) | 2022-01-21 | 2022-01-21 | Power battery with expansion force detection function and safety monitoring system thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115954570A (en) * | 2023-03-09 | 2023-04-11 | 宁德时代新能源科技股份有限公司 | Battery cell, battery and consumer |
| CN116294959A (en) * | 2023-05-11 | 2023-06-23 | 合肥皖科智能技术有限公司 | Battery bulge on-line monitoring system and method |
| CN117930006A (en) * | 2024-01-23 | 2024-04-26 | 中国石油大学(华东) | Arc fault identification method based on battery expansion force and voltage characteristics |
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2022
- 2022-01-21 CN CN202220161940.9U patent/CN217156760U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115954570A (en) * | 2023-03-09 | 2023-04-11 | 宁德时代新能源科技股份有限公司 | Battery cell, battery and consumer |
| CN116294959A (en) * | 2023-05-11 | 2023-06-23 | 合肥皖科智能技术有限公司 | Battery bulge on-line monitoring system and method |
| CN116294959B (en) * | 2023-05-11 | 2024-01-09 | 合肥皖科智能技术有限公司 | Battery bulge on-line monitoring system and method |
| CN117930006A (en) * | 2024-01-23 | 2024-04-26 | 中国石油大学(华东) | Arc fault identification method based on battery expansion force and voltage characteristics |
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