CN116337608A - Battery expansion distribution force monitoring system and method - Google Patents
Battery expansion distribution force monitoring system and method Download PDFInfo
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- CN116337608A CN116337608A CN202111594540.3A CN202111594540A CN116337608A CN 116337608 A CN116337608 A CN 116337608A CN 202111594540 A CN202111594540 A CN 202111594540A CN 116337608 A CN116337608 A CN 116337608A
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 44
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 41
- 229910001416 lithium ion Inorganic materials 0.000 description 41
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- 239000011159 matrix material Substances 0.000 description 6
- 238000012545 processing Methods 0.000 description 6
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- 238000005538 encapsulation Methods 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000013480 data collection Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000002845 discoloration Methods 0.000 description 2
- 238000003384 imaging method Methods 0.000 description 2
- 238000004806 packaging method and process Methods 0.000 description 2
- 229920001721 polyimide Polymers 0.000 description 2
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- 239000004820 Pressure-sensitive adhesive Substances 0.000 description 1
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- 238000009530 blood pressure measurement Methods 0.000 description 1
- 238000005253 cladding Methods 0.000 description 1
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- 238000004146 energy storage Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 238000001259 photo etching Methods 0.000 description 1
- 238000004451 qualitative analysis Methods 0.000 description 1
- 238000011002 quantification Methods 0.000 description 1
- 238000004445 quantitative analysis Methods 0.000 description 1
- 238000011897 real-time detection Methods 0.000 description 1
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/003—Generation of the force
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y02E60/10—Energy storage using batteries
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Abstract
The invention provides a system and a method for monitoring battery expansion distribution force, comprising the following steps: the pressure sensing units comprise unit columns, and strain gauges are arranged on the outer walls of the unit columns; the pressure loading mechanism is arranged above the plurality of pressure sensing units, and the battery can be placed between the plurality of pressure sensing units and the pressure loading mechanism; the control unit is connected with the pressure loading mechanism; the strain data acquisition instrument is connected with the strain gauge; the pressure sensor is connected with the control unit and the pressure loading mechanism; the pressure data acquisition device is connected with the pressure sensor. The technical scheme of the invention has the beneficial effects that the pre-pressure loading degree is accurately controlled, and the battery expansion force under the pre-pressure loading is accurately collected in real time at multiple points through the pressure sensors arranged in an array manner, so as to monitor the initial distribution force state of the battery and the evolution process of the battery expansion distribution force state in the cyclic charge and discharge process.
Description
Technical Field
The invention belongs to the technical field of lithium ion batteries, and particularly relates to a system and a method for monitoring expansion distribution force of a battery.
Background
In recent years, due to the advantages of high energy density, high voltage, long service life and the like of the lithium ion battery, the lithium ion battery is widely applied to the fields of aerospace, 3C electronics, energy storage and the like, and particularly the vigorous development of the new energy electric automobile industry further promotes the profound development of the lithium ion battery in the aspects of materials, structures and the like. However, the lithium ion battery has an unavoidable volume deformation problem during the charge and discharge process, and the problem is accompanied with the improvement of the energy density and the quick charge capacity of the battery cell, and the problem of uniform expansion deformation of the small battery cell along the thickness direction is gradually developed into the problem of non-uniform expansion of the large battery cell in-plane. The nonuniform expansion of the lithium ion battery not only affects the structural design of the battery core and the module, but also causes the attenuation of the performance of the battery and increases the potential safety hazard. Therefore, the problem of nonuniform expansion of the lithium ion battery in the charge and discharge process is thoroughly and comprehensively studied, and the method has important significance for optimizing the design of the battery and improving the safety of the battery core.
Currently, the method commonly used for testing the distribution force of the lithium ion battery mainly comprises a distributed film pressure sensor based on a piezoresistor. The pressure sensing test system with mature process and stable test is mainly manufactured by Tekscan corporation in America, the sensor adopts flexible materials as a substrate, a grid-shaped distribution design is formed through the pressure sensitive materials and a circuit printing process, the thickness is thinner than 0.1mm, the pressure sensing test system is suitable for pressure measurement between contact surfaces, but is limited by the change rule of the resistance of the pressure sensitive materials, the test precision of the sensor is about 10%, and therefore, the sensor cannot accurately quantify the expansion force distribution of a lithium ion battery and only performs qualitative analysis. The Chinese patent CN210400665U, an on-line measuring device for the expansion force distribution of the lithium ion battery, provides a lithium ion battery expansion force distribution test which is mainly based on the principle of discoloration of a pressure-sensitive adhesive sheet, and records the discoloration condition of the sheet in real time through a scanner for later image data processing. The method can only record the pressure state in real time, and a large number of image data processing processes exist, so that the method has no advantages in terms of accurate quantification and easy operation.
Therefore, in the field of lithium ion battery testing, a battery expansion distribution force monitoring system with simple operation and higher precision is expected.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provides a battery expansion distribution force monitoring system and a battery expansion distribution force monitoring method. The pressure sensing units are distributed and arranged in a matrix form, and the strain gauges are arranged on the surfaces of the unit cylinders. The pressure data acquisition device acquires the whole pressure data of the battery charged expansion fed back to the pressure sensor for a plurality of times, and the strain data acquisition device acquires the strain data of the strain gauges of the plurality of pressure sensing units for a plurality of times, and the whole pressure data and the corresponding plurality of strain data are displayed in time sequence at the acquisition terminal so as to realize monitoring of the initial distribution force state of the battery under the initial load condition and the expansion distribution force state of the battery in the cyclic charge and discharge process.
In order to achieve the above object, the technical scheme of the present invention is as follows:
the invention provides a battery expansion distribution force monitoring system, comprising:
the pressure sensing units are arranged in an array mode and comprise unit columns, and strain gauges are arranged on the outer walls of the unit columns;
a pressure loading mechanism disposed above the plurality of pressure sensing units, a battery being capable of being placed between the plurality of pressure sensing units and the pressure loading mechanism;
the control unit is connected with the pressure loading mechanism;
the strain data acquisition instrument is connected with the strain gauge;
the pressure sensor is connected with the control unit and the pressure loading mechanism;
the pressure data acquisition device is connected with the pressure sensor.
Preferably, the strain gauge comprises a strain substrate, a plurality of strain wire grids are arranged on the strain substrate, and welding points of the plurality of strain wire grids are connected with the channels of the strain data acquisition instrument.
Preferably, the number of the strain wire grids of each pressure sensing unit is four, and the strain wire grids are connected in a Wheatstone full bridge.
Preferably, the pressure sensor is an S-shaped pull pressure sensor.
Preferably, the pressure loading mechanism includes:
the top plate and the base are oppositely arranged and form a frame structure through a plurality of supporting upright posts;
the four corners of the loading plate are provided with a plurality of through holes, the supporting upright posts pass through the through holes and are respectively fixedly connected with the top plate and the base, and the loading plate is arranged on the supporting upright posts in a sliding manner;
one end of each limiting rod vertically penetrates through the top plate to be connected with the top plate in a sliding mode, and the other end of each limiting rod is fixedly connected with the loading plate;
the reinforcing plate is arranged between the top plate and the loading plate, and two ends of the reinforcing plate are connected with the limiting rods.
Preferably, the control unit includes:
the servo electric cylinder is arranged on the top plate and penetrates through the top plate to be connected with the pressure sensor;
and the pressure controller is connected with the servo electric cylinder.
Preferably, the pressure sensing device further comprises an encapsulation shell, wherein the encapsulation shell is connected with the base and is arranged on two side surfaces of the pressure sensing units.
Preferably, the pressure sensing unit further includes:
the unit base is fixed on the base, and the unit column body is arranged on the unit base;
the unit bearing table is arranged on the unit column body, a plurality of unit bearing tables which are arranged in an array mode form an integral bearing table, and the area of the integral bearing table is not smaller than the area of a contact surface of the battery.
Preferably, the battery pack further comprises an insulating silica gel film, wherein the insulating silica gel film is arranged between the integral bearing table and the battery.
The invention also provides a method for monitoring the expansion distribution force of the battery, which comprises the following steps of:
fixing the battery between the pressure loading mechanism and the plurality of pressure sensing units;
the control unit controls the pressure loading mechanism to apply pre-pressure to the battery;
circularly charging and discharging the battery;
the pressure data acquisition unit of the control unit acquires the whole pressure data fed back to the pressure sensor by the battery for a plurality of times;
the strain data acquisition instrument acquires strain data of strain gauges of the pressure sensing units for a plurality of times;
and transmitting the whole pressure data acquired at different moments and a plurality of strain data corresponding to a certain moment to an acquisition terminal and displaying the whole pressure data and the strain data in time sequence.
The technical scheme of the invention has the beneficial effects that:
1) According to the invention, the pre-pressure loading degree is accurately controlled, and the battery expansion force under the pre-pressure loading is accurately collected in real time at multiple points through the pressure sensors arranged in an array manner, so that the initial distribution force state of the battery and the evolution process of the battery expansion distribution force state in the cyclic charge and discharge process are monitored.
2) The pressure loading mechanism ensures the parallelism of the upper loading surface and the lower loading surface through single-shaft constant displacement precompression loading, and avoids the problem that a monitoring platform brings uneven loading to a battery.
3) The invention can monitor the whole pressure data of the pressure sensor in real time through the pressure data collector so as to reflect the whole loading condition of the pressure loading mechanism in real time, and realize accurate pre-pressure loading through the pressure controller.
4) The design of the pressure sensing unit can be flexibly adjusted according to the test object so as to meet the test range and the test precision of different batteries.
Drawings
The foregoing and other objects, features and advantages of the invention will be apparent from the following more particular descriptions of exemplary embodiments of the invention as illustrated in the accompanying drawings wherein like reference numbers generally represent like parts throughout the exemplary embodiments of the invention.
Fig. 1 is a schematic structural diagram of a battery expansion distribution force monitoring system according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a battery expansion distribution force monitoring platform according to an embodiment of the present invention;
FIG. 3 is a top view of a load bearing area of a battery expansion distribution force monitoring platform according to an embodiment of the present invention;
FIG. 4 is a front view of a pressure sensing unit of a battery expansion distribution force monitoring platform according to an embodiment of the present invention;
fig. 5 is a flowchart showing steps of a method for monitoring a battery expansion distribution force according to an embodiment of the present invention.
Reference numerals illustrate:
1. monitoring a platform frame; 11. a base; 12. packaging the shell; 13. a support column; 14. a top plate; 15. an insulating silicone film; 16. an integral bearing table; 2. a pressure loading mechanism; 21. a loading plate; 22. a limit rod; 23. a servo electric cylinder; 24. a pressure sensor; 25. a reinforcing plate; 3. a pressure sensing unit; 31. a unit base; 32. a unit loading table; 33. a bolt; 34. a strain gage; 35. a unit column; 341. a strained substrate; 342. a strain wire grid; 343. welding points; 4. batteries (lithium ion batteries); 5. a strain data acquisition instrument; 6. a pressure data collector; 7. a collecting terminal; 8. a charge-discharge device; 9. and a control unit.
Detailed Description
The method provides a simple, convenient, quick and high-precision quantitative analysis real-time detection means for further researching the problem of uneven expansion of the lithium ion battery in the charge and discharge process, optimizing the design of the battery and improving the safety of the battery core. The invention aims to provide a system and a method for monitoring expansion distribution force of a lithium ion battery, which can accurately apply constant displacement pressure load according to different working conditions, obtain an initial distribution force state of the lithium ion battery under the initial load condition and obtain an evolution process of the expansion distribution force state of the lithium ion battery during charge and discharge cycles.
Preferred embodiments of the present invention will be described in more detail below. While the preferred embodiments of the present invention are described below, it should be understood that the present invention may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
Referring to fig. 1-4, the present invention provides a battery expansion distribution force monitoring system comprising:
the pressure sensing units 3 are arranged in an array mode, the pressure sensing units 3 comprise unit columns 35, and strain gauges 34 are arranged on the outer walls of the unit columns 35;
a pressure loading mechanism 2 provided above the plurality of pressure sensing units 3, the battery 4 being capable of being placed between the plurality of pressure sensing units 3 and the pressure loading mechanism 2;
a control unit 9, the control unit 9 being connected to the pressure loading mechanism 2;
the strain data acquisition instrument 5 is connected with the strain gauge 34;
a pressure sensor 24, the pressure sensor 24 being connected to the control unit 9 and the pressure loading mechanism 2;
Specifically, in the present embodiment, the battery 4 is illustrated as a lithium ion battery, the lithium ion battery 4 is placed between the plurality of pressure sensing units 3 and the pressure loading mechanism 2, and in the uncharged state, the control unit 9 drives the pressure loading mechanism 2 to slide and apply the pre-compression to the lithium ion battery 4, that is, the pressure load under the constant displacement pre-compression loading condition. The pressure load is correspondingly fed back to the whole pressure data of the pressure sensor 24, the whole pressure data is monitored and collected through a pressure data collector 6 connected with the pressure sensor 24, and the whole pressure data is transmitted to a collecting terminal 7 for storage and recording.
Meanwhile, the pressure sensing unit 3 converts pressure into strain data through the strain gauge 34 according to respective stress conditions, the strain data are transmitted to the acquisition terminal 7 for storage and recording through the strain data acquisition instrument 5, the strain data are further converted into pressure data through data processing of the acquisition terminal 7, and matrix image display is carried out with the whole pressure data, so that the initial distribution force state of the lithium ion battery 4 in the uncharged state is obtained.
According to different working conditions, the lithium ion battery 4 is subjected to charge-discharge circulation, in the charge-discharge process, the lithium ion battery 4 is subjected to expansion deformation, and the pressure loading provided by the pressure loading mechanism 2 clamps the lithium ion battery 4, so that the expansion deformation of the lithium ion battery 4 can lead to the pressure change received by the integral bearing table 16, the integral pressure change is fed back to the pressure sensor 24, the pressure data collector 6 connected with the pressure sensor 24 performs data collection at set sampling interval time, and real-time integral pressure data is transmitted to the collection terminal 7 for storage record.
The local pressure change of the lithium ion battery 4 is converted into strain data by the strain gauge 34 of the pressure sensing unit 3, and the strain data is synchronously acquired at the set sampling interval time by the strain data acquisition instrument 5 and transmitted to the acquisition terminal 7 for storage and recording. The user can further convert the strain data into pressure data through the data processing of the acquisition terminal 7, and the integral pressure data acquired at different moments and the strain data of the plurality of strain gauges 34 acquired at a certain moment are displayed in a matrix mode according to time sequence in a sampling monitoring period, so that the evolution process of the expansion distribution force state of the lithium ion battery in the charging and discharging process can be obtained.
Further, the acquisition terminal 7 is a PC terminal, and can analyze and display data at the PC terminal, and control operations of related devices of the whole system, such as the pressure data acquisition device 6, the strain data acquisition device 5, the control unit 9, the charge and discharge device 8, and the like. The PC terminal can also be connected with a cloud image imaging device, and the acquired data is displayed in a cloud image mode through the cloud image imaging device.
Preferably, the strain data acquisition device 5 is a DH3816N static strain gauge.
Referring to fig. 4, alternatively, the strain gauge 34 includes a strain substrate 341, where a plurality of strain wire gratings 342 are disposed on the strain substrate 341, and welding points 343 of the plurality of strain wire gratings 342 are connected with channels of the strain data acquisition instrument 5.
Specifically, the strain gauge 34 is composed of a strain substrate 341, a strain wire grid 342, and a welding point 343 at the joint of the strain wire grid 342. The strain substrate 341 is made of polyimide, the strain wire grid 342 is arranged on the strain substrate 341 through a photoetching process, and a layer of polyimide film is covered on the upper surface of the strain wire grid 342 to form a three-layer cladding structure. The structural form of the strain wire grating 342 is designed according to the actual working condition, and a half-bridge or full-bridge connection can be adopted. The connection of the strain wire grids 342 forms a strain wire grid welding point 343, and the welding point 343 is connected with a channel of the strain data acquisition instrument 5 by a welding wire for real-time acquisition of strain data.
Alternatively, the strain bars 342 of each pressure sensing cell 2 are provided in four, the strain bars 342 being connected in a wheatstone full bridge.
Specifically, four strain grids 342 in different longitudinal and transverse directions are arranged on each strain gauge 34, and are connected through a Wheatstone full bridge circuit, so that the structure is simple, and the accuracy and the sensitivity are high. The area occupied by each wire grid is 2X 2mm, and the resistance value is 120 ohms. The four strain bars 342 are connected in a shape distribution as shown in fig. 4, so as to achieve the purpose of accurate acquisition.
Alternatively, the pressure sensor 24 is an S-shaped pull pressure sensor.
Specifically, an S-shaped tension and compression sensor is arranged, the expansion external force of the lithium ion battery 4 is converted into an electric signal through an internal conversion element and a conversion circuit, and then the electric signal is processed into integral pressure data through the pressure data collector 6, so that the stability is high, and the installation and the debugging are convenient.
Referring to fig. 2, the pressure loading mechanism 2 may alternatively include:
a top plate 14 and a base 11, the top plate 14 and the base 11 being disposed opposite to each other and forming a frame structure by a plurality of support columns 13;
the loading plate 21, four corners of the loading plate 21 are provided with a plurality of through holes, the supporting upright posts 13 pass through the through holes and are respectively fixedly connected with the top plate 14 and the base 11, and the loading plate 21 is arranged on the supporting upright posts 13 in a sliding manner;
one end of each limiting rod 22 vertically penetrates through the top plate 14 to be in sliding connection with the top plate 14, and the other end of each limiting rod 22 is fixedly connected with the loading plate 21;
the reinforcing plate 25, the reinforcing plate 25 sets up between roof 14 and loading board 21, and the both ends of reinforcing plate 25 are connected with gag lever post 22.
Optionally, the control unit 9 further includes:
a servo cylinder 23, the servo cylinder 23 being provided on the top plate 14 and connected to the pressure sensor 24 through the top plate 14;
and the pressure controller is connected with the servo electric cylinder 23.
Specifically, the supporting upright posts 13 are fixedly connected with the base 11 and the top plate 14 through bolts to form the monitoring platform frame 1 with an integral structure. The loading plate 21 and the reinforcing plate 25 are fixedly connected with the limit rod 22 by welding. Four corners of the loading plate 21 are provided with through holes and pass through the four support columns 13, so that the loading plate 21 can slide under the constraint of the support columns 13. The pressure sensing units 3 are closely arranged in an array form on the base 11 and are fixed by bolts 33 to form an integral bearing table 16. The base 11, the top plate 14, the loading plate 21 and the reinforcing plate 25 are arranged in parallel, and the monitoring platform is in a whole structure frame mode, so that the loading plate 21 can always keep parallel relation with the whole bearing table 16 in the constant displacement loading process.
The pressure sensor 24 is provided on the reinforcing plate 25. The servo cylinder 23 is fixed to the top plate 14 with its own loading column extending above the loading plate 21 through a through hole of the top plate 14, and the loading plate 21 is connected to the loading column of the servo cylinder 23 by a pressure sensor 24. The loading plate 21 is pushed to slide by a single shaft of the loading column of the servo electric cylinder 23 to realize constant displacement pre-pressure loading, so that parallelism of upper and lower loading surfaces is ensured, and the problem that a monitoring platform causes uneven loading to a battery is avoided.
The pressure data collector 6 can monitor the whole pressure data of the pressure sensor 24 in real time so as to reflect the whole loading condition of the pressure loading mechanism 2 in real time and realize accurate pre-pressure loading through the pressure controller.
Optionally, the pressure sensor further comprises an encapsulation shell 12, wherein the encapsulation shell 12 is connected with the base 11 and is arranged on two sides of the pressure sensing units 3.
Specifically, the pressure sensing units 3 are closely arranged in an array form to the base 11 and are fixed by bolts 33. The base 11 and the pressure sensing unit 3 are packaged by the packaging shell 12 on the side face, so that a protection effect is achieved.
Referring to fig. 3 and 4, the pressure sensing unit 3 may further include:
a unit base 31, the unit base 31 being fixed to the base 11, the unit base 31 being provided with a unit column 35;
the unit loading table 32, the unit loading table 32 is arranged on the unit column 35, the unit loading tables 32 arranged in an array form the whole loading table 16, and the area of the whole loading table 16 is not smaller than the area of the contact surface with the battery 4.
Specifically, the unit base 31 is fixed to the base 11 of the monitor platform frame 1 by bolts 33, and the unit carrying platforms 32 are closely arranged in an array to form an integral carrying platform 16. The area of the integral bearing table 16 is not smaller than the area of the contact surface with the lithium ion battery 4, so that the expansion distribution force change of the whole lithium ion battery 4 can be monitored. The strain gauge 34 is fixed on the surface of the unit cylinder 35 by a special adhesive. The material selection and size design of the unit base 31, the unit bearing table 32 and the unit column 35 in the pressure sensing unit 3 can be flexibly changed according to specific testing requirements so as to meet the testing range and precision of different batteries.
Optionally, an insulating silica gel film 15 is further included, and the insulating silica gel film 15 is disposed between the integral bearing table 16 and the battery 4.
Specifically, the lithium ion battery 4 is fixed on the surface of the insulating silica gel film 15, and is connected with the charging and discharging equipment 8 by adopting a four-wire connection method. The lithium ion battery 4 in the electrified state is insulated from other metal parts through the insulating silica gel film 15, so that the safety and reliability of the use of the monitoring platform are ensured.
Referring to fig. 5, the present invention further provides a method for monitoring a battery expansion distribution force, using the above system for monitoring a battery expansion distribution force, the method comprising:
step S1, fixing a battery 4 between a pressure loading mechanism 2 and a plurality of pressure sensing units 3;
step S2, the control unit 9 controls the pressure loading mechanism 2 to apply a pre-compression force to the battery 4;
step S3, circularly charging and discharging the battery 4;
step S4, the pressure data collector of the control unit collects the whole pressure data fed back to the pressure sensor 24 by the battery for a plurality of times;
step S5, the strain data acquisition instrument acquires the strain data of the strain gauges 34 of the plurality of pressure sensing units 3 for a plurality of times;
and S6, transmitting the whole pressure data acquired at different moments and a plurality of strain data corresponding to a certain moment to an acquisition terminal and displaying the whole pressure data and the strain data in time sequence.
Specifically, the lithium ion battery 4 is placed between the plurality of pressure sensing units 3 and the pressure loading mechanism 2, fixed on the surface of the insulating silica gel film 15, and connected with the charging and discharging equipment 8 by adopting a four-wire system connection method. In the uncharged state, the control unit 9 drives the pressure loading mechanism 2 to slide through the servo cylinder 23 and applies a pre-compression force, that is, a pressure load under a constant displacement pre-compression loading condition, to the lithium ion battery 4. The pressure load is correspondingly fed back to the pressure sensor 24 overall pressure data and a precise pre-pressure loading is achieved by the pressure controller. The pressure data collector 6 connected with the pressure sensor 24 is used for monitoring and collecting so as to reflect the integral loading condition of the pressure loading mechanism 2 in real time, and the integral pressure data is transmitted to the collecting terminal 7 for storage and recording.
Meanwhile, the pressure sensing unit 3 converts pressure into strain data through the strain gauge 34 according to respective stress conditions, the strain data are transmitted to the acquisition terminal 7 for storage and recording through the strain data acquisition instrument 5, the strain data are further converted into pressure data through data processing of the acquisition terminal 7, and matrix image display is carried out with the whole pressure data, so that the initial distribution force state of the lithium ion battery 4 in the uncharged state is obtained.
According to different working conditions, the lithium ion battery 4 is subjected to charge-discharge circulation, in the charge-discharge process, the lithium ion battery 4 is subjected to expansion deformation, and the pressure loading provided by the pressure loading mechanism 2 clamps the lithium ion battery 4, so that the expansion deformation of the lithium ion battery 4 can lead to the pressure change received by the integral bearing table 16, the integral pressure change is fed back to the pressure sensor 24, the pressure data collector 6 connected with the pressure sensor 24 performs data collection at set sampling interval time, and real-time integral pressure data is transmitted to the collection terminal 7 for storage record.
The local pressure change of the lithium ion battery 4 is converted into strain data by the strain gauge 34 of the pressure sensing unit 3, and the strain data is synchronously acquired at the set sampling interval time by the strain data acquisition instrument 5 and transmitted to the acquisition terminal 7 for storage and recording. The user can further convert the strain data into pressure data through the data processing of the acquisition terminal 7, and the integral pressure data acquired at different moments and the strain data of the plurality of strain gauges 34 acquired at a certain moment are displayed in a matrix mode according to time sequence in a sampling monitoring period, so that the evolution process of the expansion distribution force state of the lithium ion battery in the charging and discharging process can be obtained.
Example 1
Referring to fig. 1-4, the present embodiment provides a battery expansion distribution force monitoring system, comprising:
the pressure sensing units 3 are arranged in an array mode, the pressure sensing units 3 comprise unit columns 35, and strain gauges 34 are arranged on the outer walls of the unit columns 35;
a pressure loading mechanism 2 provided above the plurality of pressure sensing units 3, the battery 4 being capable of being placed between the plurality of pressure sensing units 3 and the pressure loading mechanism 2;
a control unit 9, the control unit 9 being connected to the pressure loading mechanism 2;
the strain data acquisition instrument 5 is connected with the strain gauge 34;
a pressure sensor 24, the pressure sensor 24 being connected to the control unit 9 and the pressure loading mechanism 2;
In this embodiment, the strain gauge 34 includes a strain substrate 341, a plurality of strain wires 342 are disposed on the strain substrate 341, and welding points 343 of the plurality of strain wires 342 are connected with the channels of the strain data acquisition instrument 5.
In this embodiment, the strain bars 342 of each pressure sensing unit 2 are provided in four, and the strain bars 342 are connected in a wheatstone full bridge.
In this embodiment, the pressure sensor 24 is an S-type tension-compression sensor.
In the present embodiment, the pressure loading mechanism 2 includes:
a top plate 14 and a base 11, the top plate 14 and the base 11 being disposed opposite to each other and forming a frame structure by a plurality of support columns 13;
the loading plate 21, four corners of the loading plate 21 are provided with a plurality of through holes, the supporting upright posts 13 pass through the through holes and are respectively fixedly connected with the top plate 14 and the base 11, and the loading plate 21 is arranged on the supporting upright posts 13 in a sliding manner;
one end of each limiting rod 22 vertically penetrates through the top plate 14 to be in sliding connection with the top plate 14, and the other end of each limiting rod 22 is fixedly connected with the loading plate 21;
the reinforcing plate 25, the reinforcing plate 25 sets up between roof 14 and loading board 21, and the both ends of reinforcing plate 25 are connected with gag lever post 22.
In the present embodiment, the control unit 9 further includes:
a servo cylinder 23, the servo cylinder 23 being provided on the top plate 14 and connected to the pressure sensor 24 through the top plate 14;
and the pressure controller is connected with the servo electric cylinder 23.
In this embodiment, the pressure sensor further includes a package 12, where the package 12 is connected to the base 11 and disposed on two sides of the pressure sensor units 3.
In the present embodiment, the pressure sensing unit 3 further includes:
a unit base 31, the unit base 31 being fixed to the base 11, the unit base 31 being provided with a unit column 35;
the unit loading table 32, the unit loading table 32 is arranged on the unit column 35, the unit loading tables 32 arranged in an array form the whole loading table 16, and the area of the whole loading table 16 is not smaller than the area of the contact surface with the battery 4.
In this embodiment, the battery module further includes an insulating silica gel film 15, and the insulating silica gel film 15 is disposed between the integral bearing table 16 and the battery 4.
Example 2
Referring to fig. 5, the present embodiment provides a method for monitoring a battery expansion distribution force, and the method includes:
step S1, fixing a battery 4 between a pressure loading mechanism 2 and a plurality of pressure sensing units 3;
step S2, the control unit 9 controls the pressure loading mechanism 2 to apply a pre-compression force to the battery 4;
step S3, circularly charging and discharging the battery 4;
step S4, the pressure data collector of the control unit collects the whole pressure data fed back to the pressure sensor 24 by the battery for a plurality of times;
step S5, the strain data acquisition instrument acquires the strain data of the strain gauges 34 of the plurality of pressure sensing units 3 for a plurality of times;
and S6, transmitting the whole pressure data acquired at different moments and a plurality of strain data corresponding to a certain moment to an acquisition terminal and displaying the whole pressure data and the strain data in time sequence.
In summary, the pressure sensing unit is provided with the pressure loading mechanism and the pressure sensing units arranged in an array mode. The pressure loading mechanism realizes single-shaft, constant-displacement and controllable pre-pressure loading through a servo electric cylinder, an S-shaped tension and compression sensor and a parallel loading plate. The pressure sensing unit is used for realizing high-precision conversion of strain and pressure information by fixing the strain gauge on the surface of the unit cylinder, and integrating and distributing the force monitoring platform in a matrix form. The strain wire grid of the strain gauge adopts a Wheatstone full-bridge circuit connection design to improve the test precision.
The method comprises the steps that sampling interval time is set in a monitoring period, a pressure data acquisition device acquires integral pressure data of battery charging expansion fed back to a pressure sensor for many times, a strain data acquisition device acquires strain data of strain gauges of a plurality of pressure sensing units for many times, and the integral pressure data and the corresponding strain data are displayed in time sequence at an acquisition terminal so as to realize monitoring of initial distribution force states of the battery under initial load conditions and expansion distribution force states of the battery in a cyclic charging and discharging process.
The foregoing description of embodiments of the invention has been presented for purposes of illustration and description, and is not intended to be exhaustive or limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the various embodiments described.
Claims (10)
1. A battery expansion distribution force monitoring system, comprising:
the pressure sensing units are arranged in an array mode and comprise unit columns, and strain gauges are arranged on the outer walls of the unit columns;
a pressure loading mechanism disposed above the plurality of pressure sensing units, a battery being capable of being placed between the plurality of pressure sensing units and the pressure loading mechanism;
the control unit is connected with the pressure loading mechanism;
the strain data acquisition instrument is connected with the strain gauge;
the pressure sensor is connected with the control unit and the pressure loading mechanism;
the pressure data acquisition device is connected with the pressure sensor.
2. The battery expansion distribution force monitoring system according to claim 1, wherein the strain gauge comprises a strain substrate, a plurality of strain wire grids are arranged on the strain substrate, and welding points of the plurality of strain wire grids are connected with the channel of the strain data acquisition instrument.
3. The battery expansion distribution force monitoring system of claim 2, wherein the strain wire grids of each of the pressure sensing cells are provided in four, the strain wire grids being connected in a wheatstone full bridge.
4. The battery expansion distribution force monitoring system of claim 1, wherein the pressure sensor is an S-shaped pull pressure sensor.
5. The battery expansion distribution force monitoring system according to claim 1, wherein the pressure loading mechanism comprises:
the top plate and the base are oppositely arranged and form a frame structure through a plurality of supporting upright posts;
the four corners of the loading plate are provided with a plurality of through holes, the supporting upright posts pass through the through holes and are respectively fixedly connected with the top plate and the base, and the loading plate is arranged on the supporting upright posts in a sliding manner;
one end of each limiting rod vertically penetrates through the top plate to be connected with the top plate in a sliding mode, and the other end of each limiting rod is fixedly connected with the loading plate;
the reinforcing plate is arranged between the top plate and the loading plate, and two ends of the reinforcing plate are connected with the limiting rods.
6. The battery expansion distribution force monitoring system according to claim 5, wherein the control unit includes:
the servo electric cylinder is arranged on the top plate and penetrates through the top plate to be connected with the pressure sensor;
and the pressure controller is connected with the servo electric cylinder.
7. The battery expansion distribution force monitoring system according to claim 5, further comprising a package connected to the base and disposed on both sides of the plurality of pressure sensing units.
8. The battery expansion distribution force monitoring system according to claim 5, wherein the pressure sensing unit further comprises:
the unit base is fixed on the base, and the unit column body is arranged on the unit base;
the unit bearing table is arranged on the unit column body, a plurality of unit bearing tables which are arranged in an array mode form an integral bearing table, and the area of the integral bearing table is not smaller than the area of a contact surface of the battery.
9. The cell expansion distribution force monitoring system of claim 8, further comprising an insulating silicone film disposed between the integral carrier and the cell.
10. A battery expansion distribution force monitoring method using the battery expansion distribution force monitoring system according to any one of claims 1 to 9, characterized by comprising:
fixing the battery between the pressure loading mechanism and the plurality of pressure sensing units;
the control unit controls the pressure loading mechanism to apply pre-pressure to the battery;
circularly charging and discharging the battery;
the pressure data acquisition unit of the control unit acquires the whole pressure data fed back to the pressure sensor by the battery for a plurality of times;
the strain data acquisition instrument acquires strain data of strain gauges of the pressure sensing units for a plurality of times;
and transmitting the whole pressure data acquired at different moments and a plurality of strain data corresponding to a certain moment to an acquisition terminal and displaying the whole pressure data and the strain data in time sequence.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111594540.3A CN116337608A (en) | 2021-12-23 | 2021-12-23 | Battery expansion distribution force monitoring system and method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111594540.3A CN116337608A (en) | 2021-12-23 | 2021-12-23 | Battery expansion distribution force monitoring system and method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117034720A (en) * | 2023-10-08 | 2023-11-10 | 蜂巢能源科技(无锡)有限公司 | Battery pressure evaluation method, device, system and storage medium |
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- 2021-12-23 CN CN202111594540.3A patent/CN116337608A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117034720A (en) * | 2023-10-08 | 2023-11-10 | 蜂巢能源科技(无锡)有限公司 | Battery pressure evaluation method, device, system and storage medium |
| CN117034720B (en) * | 2023-10-08 | 2024-01-23 | 蜂巢能源科技(无锡)有限公司 | Battery pressure evaluation method, device, system and storage medium |
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