CN106768567A - The detection means and measuring method of lithium ion battery internal stress - Google Patents
The detection means and measuring method of lithium ion battery internal stress Download PDFInfo
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- CN106768567A CN106768567A CN201710163544.3A CN201710163544A CN106768567A CN 106768567 A CN106768567 A CN 106768567A CN 201710163544 A CN201710163544 A CN 201710163544A CN 106768567 A CN106768567 A CN 106768567A
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- strain transducer
- optical fiber
- lithium ion
- ion battery
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
- G01L5/0047—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes measuring forces due to residual stresses
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Abstract
The invention discloses a kind of detection means and measuring method of lithium ion battery internal stress, to overcome, measurement lithium ion battery internal stress is computationally intensive, time-consuming, the problem that cannot be applied on real vehicle, detection means includes strain transducer probe assembly, strain transducer probe optical fiber component, casing (29), analog-digital converter (30), single-chip microcomputer (31) and host computer (32)；One end connection of output end and strain transducer the probe optical fiber component of strain transducer probe assembly, the input connection of each strain transducer in the other end and casing (29) of strain transducer probe optical fiber component, the output end of each strain transducer is connected with the input of analog-digital converter (30) in casing (29), the input connection of the output end and single-chip microcomputer (32) of analog-digital converter (30), output end and host computer (32) connection of single-chip microcomputer (31).Present invention also offers a kind of measuring method for measuring lithium ion battery internal stress.
Description
Technical field
The invention belongs to technical field of lithium ion, it more particularly relates to a kind of lithium ion battery planted agent
The detection means and measuring method of power.
Background technology
Lithium ion battery is due to power density and energy density high, memory-less effect, self discharge be small, cycle life
The excellent characteristics such as long and pollution-free, are the ideal sources of current electric automobile.Meanwhile, lithium ion battery is in space equipment, hand
The fields such as machine, notebook computer and electric bicycle have shown wide application prospect.
In use, lithium ion battery can produce chemical reaction, heat production heat transfer and internal stress etc., and phase each other
Mutually influence.Wherein, performance important of the generation of internal stress to lithium ion battery.External applied load, diffusion induced stress with
Thermal stress etc. can make lithium ion battery produce internal stress, when internal stress increase may cause to a certain extent electrodes crack and
Faulty membrane, and then the performance of lithium ion battery is reduced, shorten the service life of lithium ion battery, so as to cause short circuit etc. to be pacified
Full problem.The stress analysis of lithium ion battery in recent years obtains the attention of researchers, to the research master of lithium ion battery stress
It is：The internal stress caused during lithium ion mobility, the thermal stress caused by temperature rise and thermograde, and loading bar
Research of lithium ion battery deformation etc. under part.
But internal stress is to the harm caused by lithium ion battery such as because electrode material non-homogeneous expansion is even or expands constrained
And the internal stress for producing fails more than the electrode material efflorescence that critical value is caused；Membrane compresses deformation can cause aperture and hole
Rate reduces, and then the internal resistance of lithium ion battery is increased and is caused lithium ion mobility uneven；And draw because of external load function
The problems such as internal short-circuit for rising, not yet solves, and also contributes to the safety of lithium ion battery, therefore the internal stress of lithium ion battery must
Must be effectively controlled.Research on lithium ion battery internal stress at present is predominantly ground using the method for numerical computations
Study carefully, and the method for numerical computations is computationally intensive, time-consuming, it is impossible to applied on real vehicle, it is impossible to be lithium ion battery internal stress
Control provides accurate information so that lithium ion battery has certain danger.
The content of the invention
The technical problems to be solved by the invention are the numerical computation method measurement lithium ions for overcoming prior art presence
Battery internal stress is computationally intensive, time-consuming, it is impossible to the problem applied on real vehicle, proposes a kind of inspection of lithium ion battery internal stress
Survey device and measuring method.
In order to solve the above technical problems, the present invention adopts the following technical scheme that realization：In described lithium ion battery
The detection means of stress include strain transducer probe assembly, strain transducer probe optical fiber component, casing, analog-digital converter,
Single-chip microcomputer and host computer.
One end of described strain transducer probe assembly is arranged in the inside of lithium ion battery, strain transducer probe group
The output end and strain transducer of part are popped one's head in the stranded connection in one end of optical fiber component, strain transducer probe optical fiber component it is another
The output end of each strain transducer turns with modulus in the stranded connection of input of each strain transducer, casing in end and casing
The input connection of parallel operation, the input connection of the output end and single-chip microcomputer of analog-digital converter, the output end of single-chip microcomputer passes through
RS232 serial ports and host computer are connected.
The inside that one end of strain transducer probe assembly described in technical scheme is arranged in lithium ion battery refers to：Institute
The strain transducer probe assembly stated includes 6~14 strain transducer probes, i.e., including the first strain transducer probe, second
Strain transducer probe, the 3rd strain transducer probe, the 4th strain transducer probe, the 5th strain transducer probe, the 6th
Strain transducer probe ... popped one's head in the 14th strain transducer；First strain transducer Probe arrangement is in lithium ion battery
Easily there is the internal layer negative pole coating of the corner of the negative pole of stress concentration and barrier film, i.e. negative pole and the corner of barrier film；Second
Strain transducer probe, the 3rd strain transducer probe, the 4th strain transducer probe, the 5th strain transducer probe, the 7th
Strain transducer probe, the 8th strain transducer probe, the 9th strain transducer probe, the tenth strain transducer probe, the tenth
One strain transducer probe, the 12nd strain transducer probe, the 13rd strain transducer probe and the 14th strain transducer
Probe arrangement thermal expansion in lithium ion battery charge and discharge process causes the side central area of stress concentration；6th strain sensing
Device Probe arrangement is in the central area of lithium ion battery.
The first strain transducer probe, the second strain transducer probe described in technical scheme, the 3rd strain transducer
Probe, the 4th strain transducer probe, the 5th strain transducer are popped one's head in, the 6th strain transducer is popped one's head in ... should with the 14th
Become sensor probe (14) and be fibre optic strain sensor probe, probe external diameter is 0.1mm~0.125mm.
Output end and strain transducer the probe optical fiber component of the strain transducer probe assembly described in technical scheme
One end it is stranded connection refer to：Described strain transducer probe assembly includes 6~14 strain transducer probes, i.e., including first
Strain transducer probe, the second strain transducer probe, the 3rd strain transducer probe, the 4th strain transducer probe, the 5th
Strain transducer is popped one's head in, the 6th strain transducer is popped one's head in ... popped one's head in the 14th strain transducer；Described strain transducer
Probe optical fiber component include the first optical fiber, the second optical fiber, the 3rd optical fiber, the 4th optical fiber, the 5th optical fiber, six fiberses ... with
14th optical fiber；First strain transducer probe, the second strain transducer probe, the 3rd strain transducer probe, the 4th strain
Sensor probe, the 5th strain transducer are popped one's head in, the 6th strain transducer is popped one's head in ... with the 14th strain transducer probe
Output end successively with the first optical fiber, the second optical fiber, the 3rd optical fiber, the 4th optical fiber, the 5th optical fiber, six fiberses ... with the tenth
The stranded connection in one end of four optical fiber.
The first optical fiber, the second optical fiber described in technical scheme, the 3rd optical fiber, the 4th optical fiber, the 5th optical fiber, the 6th light
Fine ... low-loss single-mode fiber is used with the 14th optical fiber, size is that 9/125 μm, i.e. optical fiber core diameter are 9 μm, covering
A diameter of 125 μm afterwards.
Each strain transducer in the other end and casing of the strain transducer probe optical fiber component described in technical scheme
Input it is stranded be connected refer to：Described strain transducer probe optical fiber component includes the first optical fiber, the second optical fiber, the 3rd
Optical fiber, the 4th optical fiber, the 5th optical fiber, six fiberses ... with the 14th optical fiber；6~14 are provided with described casing should
Become in sensor, i.e. casing and be provided with the first strain transducer, the second strain transducer, the 3rd strain transducer, the 4th strain
Sensor, the 5th strain transducer, the 6th strain transducer ... with the 14th strain transducer；First optical fiber, the second light
Fibre, the 3rd optical fiber, the 4th optical fiber, the 5th optical fiber, six fiberses ... with the other end of the 14th optical fiber successively with the first strain
Sensor, the second strain transducer, the 3rd strain transducer, the 4th strain transducer, the 5th strain transducer, the 6th strain are passed
Sensor ... the stranded connection of input with the 14th strain transducer.
The method that a kind of detection means of use lithium ion battery internal stress measures lithium ion battery internal stress, step is such as
Under：
1) lithium ion battery is made
(1) strain transducer probe assembly is cut using GC-200 strengthening core combination pliers, makes strain transducer probe assembly
The other end and battery packaging structure flush with outer surface, the other end and strain transducer of pair of strain sensors probe assembly are visited
One end end face of head optical fiber component is polished milled processed, and one end end face of strain transducer probe optical fiber component is aligned into one
End is arranged in the other end of the strain transducer probe assembly of inside lithium ion cell and carries out stranded connection；
(2) strain transducer probe assembly and strain transducer probe optical fiber component are wrapped with polytetrafluoroethylene film
Wrap up in or the metal of resistant to hydrogen fluoric acid corrosion will be coated with the outside of strain transducer probe assembly and strain transducer probe optical fiber component
Material；
(3) one end of strain transducer probe assembly is arranged in inside lithium ion cell；
(4) through hole of the diameter greater diameter than strain transducer probe assembly is set at lid on lithium ion battery；
(5) strain transducer probe optical fiber component is drawn by lithium ion battery by through hole, then through hole is sealed with scolding tin；
(6) encapsulated, encapsulation, fluid injection are carried out to lithium ion battery, the making of lithium ion battery is completed；
2) inspection of the lithium ion battery and described lithium ion battery internal stress of strain transducer probe assembly will be disposed with
Survey device miscellaneous equipment connection, will strain transducer probe optical fiber component the other end and casing in each strain transducer
The stranded connection of input, the output end of each strain transducer is connected with the input of analog-digital converter in casing, modulus turn
The input connection of the output end and single-chip microcomputer of parallel operation, the output end of single-chip microcomputer is connected by RS232 serial ports and host computer；
3) internal stress of lithium ion battery is measured.
The step of measurement lithium ion battery internal stress described in technical scheme, is as follows：
1) when lithium ion mobility of the external load function in lithium ion battery or inside lithium ion cell and there is a thermal stress
During generation, there is micro-bend disturbance in optical fiber under stress, and optical signal sends from light source, and strain transducer probe assembly receives light
The radiation detection in source to optical signal, by strain transducer popped one's head in light respectively by the optical signal that strain transducer probe assembly is detected
Fine component reaches the strain transducer in the casing outside lithium ion battery；
2) optical signal prosessing is transformed into voltage signal and is amplified by optical signal through the strain transducer in casing, afterwards
Voltage signal to amplifying carries out low-pass filtering treatment, and the voltage signal after treatment reaches analog-digital converter；
3) each voltage signal that analog-digital converter will be received is changed into the data signal that can be processed with computing, numeral
Signal reaches single-chip microcomputer through the output end of analog-digital converter；
4) after single-chip microcomputer carries out sequential operation, treatment to data signal and demarcates, sent to upper by RS232 serial ports
Machine；
5) numerical value of each position internal strain of lithium ion battery, the lithium ion battery that will be measured are shown after host computer treatment
The numerical value of each position internal strain is multiplied by its elastic modelling quantity, and lithium ion battery each detection position is calculated by mathematical method
Inner-stress value.
Strain transducer probe assembly described in technical scheme includes 6~14 strain transducers probes, i.e., including the
One strain transducer probe, the second strain transducer probe, the 3rd strain transducer probe, the 4th strain transducer probe, the
Five strain transducers are popped one's head in, the 6th strain transducer is popped one's head in ... popped one's head in the 14th strain transducer；Described strain sensing
Device probe optical fiber component include the first optical fiber, the second optical fiber, the 3rd optical fiber, the 4th optical fiber, the 5th optical fiber, six fiberses ...
With the 14th optical fiber.
Extremity piece of strain transducer probe assembly be arranged in inside lithium ion cell refer to described in technical scheme：
First strain transducer Probe arrangement occurs the interior of the corner of the negative pole of stress concentration and barrier film, i.e. negative pole in lithium ion battery
The corner of layer negative pole coating and barrier film；Second strain transducer probe, the 3rd strain transducer probe, the 4th strain transducer
Probe, the 5th strain transducer probe, the 7th strain transducer probe, the 8th strain transducer probe, the 9th strain transducer
Probe, the tenth strain transducer probe, the 11st strain transducer probe, the 12nd strain transducer probe, the 13rd strain
The thermal expansion in lithium ion battery charge and discharge process of sensor probe and the 14th strain transducer Probe arrangement causes stress collection
In side central area；6th strain transducer Probe arrangement is in the central area of lithium ion battery.
Compared with prior art the beneficial effects of the invention are as follows：
1. the detection means and measuring method of lithium ion battery internal stress of the present invention were prepared in lithium ion battery
Cheng Zhong, is evenly distributed in strain transducer probe inside lithium ion cell and the negative pole of stress concentration and the corner of barrier film easily occurs
Place, i.e. negative pole internal layer negative pole coating easily cause stress collection with thermal expansion in corner, the lithium ion battery charge and discharge process of barrier film
In side central area, specifically can at every group, (every group of each layer composition be followed successively by barrier film, negative pole and applies from outside to inside as needed
Layer, negative current collector, negative pole coating, barrier film, positive pole coating, plus plate current-collecting body, positive pole coating) near the side of internal layer negative pole coating
Side center arrangement strain transducer probe, and lithium ion battery central area, so as to it is real-time, accurately measure lithium
The distribution situation of ion battery internal stress.
2. the detection means and measuring method of lithium ion battery internal stress of the present invention are visited by by strain transducer
Head embedment inside lithium ion cell, when lithium ion battery is subject to the lithium ion mobility of external load function or inside lithium ion cell
And when thering is thermal stress to produce, strain transducer probe assembly is connected to lithium ion by strain transducer probe optical fiber component
Each strain transducer, analog-digital converter, single-chip microcomputer and host computer in outside batteries casing, so as to real-time testing lithium ion
The situation of change of battery each position internal strain, the numerical value of the lithium ion battery that will be measured each position internal strain is multiplied by its elasticity
Modulus, the inner-stress value of each detection position of lithium ion battery is calculated by mathematical method, there is provided a kind of simple and easy to do, just
In collection, can accurate in real time, multimetering lithium ion battery internal stress detection means and measuring method, can real-time judge go out lithium
The too high position of ion battery internal stress, and then optimize the technique and structure design of lithium ion battery；Moreover it is possible to more accurate
Acquisition lithium ion battery internal stress distributed in three dimensions situation, more have for the foundation of lithium ion battery internal stress threedimensional model is provided
The data of effect.
3. the strain transducer for being used in the detection means and measuring method of lithium ion battery internal stress of the present invention
Pop one's head in as fibre optic strain sensor is popped one's head in, probe external diameter can be carefully to 0.1mm small with size, and sensitivity is high, high temperature resistant, corrosion resistant
The advantages of ability of erosion, explosion-proof, preferable electromagnetism interference and atomic radiation interference, can use in strong electromagnetic, inflammable easy
In the adverse circumstances such as quick-fried and harmful.
4. the strain transducer for being used in the detection means and measuring method of lithium ion battery internal stress of the present invention
The optical fiber of probe is single-mode fiber, is a kind of excellent low loss line, can be used to transmit over long distances, with low-loss with
The characteristic of wireless amount bandwidth.
Brief description of the drawings
The present invention is further illustrated below in conjunction with the accompanying drawings：
Fig. 1 be lithium ion battery internal stress of the present invention detection means and measuring method in strain transducer probe
Placement location and through hole position axonometric projection view；
Fig. 2 be lithium ion battery internal stress of the present invention detection means and measuring method in cutting before electric core winding
Face figure；
Fig. 3 is the structure composition schematic block diagram of the detection means of lithium ion battery internal stress of the present invention；
Fig. 4 is to measure lithium ion battery internal stress using the detection means of lithium ion battery internal stress of the present invention
The FB(flow block) of measuring method；
In figure：1. the first strain transducer is popped one's head in, 2. the second strain transducer probe, 3. the 3rd strain transducer probe,
4. the 4th strain transducer is popped one's head in, 5. the 5th strain transducer probe, 6. the 6th strain transducer probe ... ..., 14. the 14th
Strain transducer is popped one's head in, 15. first optical fiber, 16. second optical fiber, 17. the 3rd optical fiber, 18. the 4th optical fiber, 19. the 5th optical fiber,
20. six fiberses ... ..., 28. the 14th optical fiber, 29. casings, 30. analog-digital converters, 31. single-chip microcomputers, 32. host computers, 33.
Lithium ion battery, 34. positive poles, 35. barrier films, 36. negative poles, 37. positive pole coatings, 38. negative pole coatings, 39. positive pole ears, 40. is negative
Pole lug, 41. plus plate current-collecting bodies, 42. negative current collectors.
Specific embodiment
The present invention is explained in detail below in conjunction with the accompanying drawings：
One lithium ion battery is mainly made up of positive pole 34, negative pole 36, electrolyte and barrier film 35, additional positive and negative lead wires,
Safety valve, PTC (positive temperature control terminal) and battery case etc..Positive pole 34 is by active material (LiCoO2/LiMnO2/
LiNixCo1-xO2/LiFeO4 it is coated on plus plate current-collecting body 41 after) adding conductive agent and adhesive well mixed, general use
Plus plate current-collecting body 41 is aluminium foil, can serve as the bridge of battery inside and outside electric charge transfer；Negative pole 36 be by active material (graphite,
MCMB, CMS) add conductive agent and adhesive to be coated on negative current collector 42 after being well mixed, the general negative current collector for using
42 is Copper Foil, can serve as the bridge of battery inside and outside electric charge transfer；Barrier film 35 is a kind of macromolecule membrane through specially-shaped,
There is film microcellular structure lithium ion can be allowed to pass freely through, and electronics can not pass through.By positive pole 34, barrier film 35, negative pole 36 with
And the material such as positive pole ear 39, negative lug 40, Protection glue band, terminal adhesive tape is fixed in equipment, by winding or lamination
Technique complete battery core making.Although lithium ion battery species is various, its operation principle is roughly the same.During charging, lithium from
The sub deintercalation from positive pole coating 37, is embedded into negative pole coating 38 by barrier film 35 and electrolyte；Entered with inverse process during electric discharge
OK.
The detection means of lithium ion battery internal stress of the present invention includes strain transducer probe assembly, strain sensing
Device probe optical fiber component, casing 29, analog-digital converter 30, single-chip microcomputer 31 and host computer 32.
Described strain transducer probe assembly includes 6~14 strain transducer probes, i.e., including the first strain sensing
Device probe the 1, second strain transducer probe the 2, the 3rd strain transducer the 3, the 4th strain transducer of probe probe the 4, the 5th is strained
Sensor probe 5, the 6th strain transducer probe 6 ... with the 14th strain transducer probe 14；
Described strain transducer probe optical fiber component includes the first optical fiber 15, the second optical fiber 16, the 3rd optical fiber the 17, the 4th
Optical fiber 18, the 5th optical fiber 19, six fiberses 20 ... with the 14th optical fiber 28, the length of each optical fiber cut as needed
Take.
Described the first strain transducer the 1, second strain transducer of popping one's head in is popped one's head in the 2, the 3rd strain transducer probe 3, the
Four strain transducers probe the 4, the 5th strain transducer the 5, the 6th strain transducer of probe probe 6 ... passed with the 14th strain
Sensor probe 14 is fibre optic strain sensor probe, and probe external diameter is 0.1mm~0.125mm；Strain transducer probe is actual
On be Optical Fiber Strain Gauge, be standard component.
Described the first strain transducer the 1, second strain transducer of popping one's head in is popped one's head in the 2, the 3rd strain transducer probe 3, the
Four strain transducers probe the 4, the 5th strain transducer the 5, the 6th strain transducer of probe probe 6 ... passed with the 14th strain
Sensor probe 14 is uniformly distributed in inside lithium ion battery 33 in the manufacturing process of lithium ion battery 33, and number is 6~14.
Strain transducer probe assembly particular location is：First strain transducer probe 1 is arranged in lithium ion battery 33 to be held
Easily there is the corner of the negative pole 36 of stress concentration and barrier film 35, i.e., the internal layer negative pole coating 38 of the negative pole 36 shown in Fig. 2 with every
The corner of film 35；Second strain transducer probe the 2, the 3rd strain transducer the 3, the 4th strain transducer of probe probe the 4, the 5th
Strain transducer probe the 5, the 7th strain transducer probe the 7, the 8th strain transducer the 8, the 9th strain transducer of probe probe 9,
Tenth strain transducer probe the 10, the 11st strain transducer the 11, the 12nd strain transducer of probe probe the 12, the 13rd is strained
Thermal expansion is easily made during sensor probe 13 is arranged in the charge and discharge process of lithium ion battery 33 with the 14th strain transducer probe 14
Into the side central area of stress concentration, specifically can as needed every group (every group of each layer composition be followed successively by from outside to inside every
Film 35, negative pole coating 38, negative current collector 42, negative pole coating 38, barrier film 35, positive pole coating 37, plus plate current-collecting body 41, positive pole are applied
Layer is 37) near the side center arrangement strain transducer probe of internal layer negative pole coating 38；6th strain transducer, 6 cloth of probe
Put in the central area of lithium ion battery 33；By 14 arrangements.
Described the first optical fiber 15, the second optical fiber 16, the 3rd optical fiber 17, the 4th optical fiber 18, the 5th stress optical fiber the 19, the 6th
Optical fiber 20 ... single-mode fiber is with the 14th optical fiber 28, size is 9/125 μm, and (optical fiber core diameter is 9 μm, diameter after covering
It is 125 μm), it is a kind of low loss line.
6~14 strain transducers are provided with described casing 29, i.e., are passed including the first strain transducer, the second strain
Sensor, the 3rd strain transducer, the 4th strain transducer, the 5th strain transducer, the 6th strain transducer ... with the 14th
Strain transducer；For the optical signal that each strain transducer probe is detected to be changed into voltage signal.
In described casing 29 14 (>6) individual strain transducer is the fibre optic strain sensor of model SFO-W, tool
There is sensitivity high, high spatial resolution is not disturbed by electromagnetism, radio frequency and lightning, and small volume, reliability are high, corrosion-resistant
Deng excellent characteristics, it is adaptable to dynamic and static measurement, energy extra long distance, Real-time and Dynamic Detection act on the strain variation feelings on optical fiber
Condition, and optical fiber bending without interference with signal long-distance transmissions, the optical signal for that will detect is changed into voltage signal.
Described through hole is arranged at the upper lid of lithium ion battery 33, and the diameter of through hole is visited slightly larger than all strain transducers
The summation of head diameter of wire.
Described analog-digital converter 30 is located at outside lithium ion battery, using the analog-digital converter of model ADC0809, is
The passage of a CMOS technology 8,8 A/D analog-digital converters of successive approximation, conversion time is 128 μ s, it is possible to achieve 8 road moulds
Analog quantity is changed, for the voltage signal of reception to be changed into the data signal that can be processed with computing.
Described single-chip microcomputer 31 is the single-chip microcomputer of 89S51 for model, and the data signal that analog-digital converter 30 sends is carried out
Sequential operation, treatment and demarcation.
Described host computer 32 is used to complete the reception of data-signal, treatment, calculating, storage and display etc..
By the other end of strain transducer probe assembly and the encapsulating structure flush with outer surface of battery 33, by strain transducer
The other end and strain transducer probe optical fiber component one end end face of probe assembly carry out appropriate polishing grinding treatment, and should
One end end face for becoming sensor probe optical fiber component is directed at the strain transducer probe that one end is arranged in inside lithium ion battery 33
The other end of component simultaneously carries out stranded connection, and the other end of strain transducer probe optical fiber component is processed through appropriate polishing grinding
The stranded interface end for being connected to each strain transducer casing 29 Nei respectively, the output end of each strain transducer in casing 29 afterwards
Be respectively connecting to the input IN0~IN7 of integrated analog digit converter 30, the D0~D7 of the output end of analog-digital converter 30 respectively with list
8 pin P0.0 of piece machine 31~P0.7 connections, the output end of single-chip microcomputer 31 is connected to host computer 32 by RS232 serial ports.
The method that lithium ion battery internal stress is measured using the detection means of lithium ion battery internal stress of the present invention：
The measuring method of lithium ion battery internal stress of the invention is that strain transducer probe assembly is arranged in into lithium ion
Heat in easy corner, the charge and discharge process of lithium ion battery 33 for the negative pole 36 of stress concentration and barrier film 35 occur in the inside of battery 33
Expansion causes the side central area of stress concentration and the central area of lithium ion battery 33, is visited strain transducer by through hole
Head optical fiber component draws lithium ion battery 33, when there is lithium of the external load function inside lithium ion battery 33 or lithium ion battery 33
During Ion transfer and when having thermal stress to produce, the output end of strain transducer probe assembly is popped one's head in optical fiber by strain transducer
Component is stranded with the input of each strain transducer in casing 29 to be connected, and the output end of each strain transducer connects in casing 29
The input of analog-digital converter 30 is connected to, and the input of the output end of analog-digital converter 30 and single-chip microcomputer 31 is connected, monolithic
The output end of machine 31 is connected to host computer 32 by RS232 serial ports, you can each position of real-time testing lithium ion battery 33 planted agent
The situation of change of change, the numerical value of the lithium ion battery that will be measured each position internal strain is multiplied by its elastic modelling quantity, by mathematics side
Method calculates the inner-stress value of each detection position of lithium ion battery.Comprise the following steps that：
1. lithium ion battery 33 is made
1) strain transducer probe assembly is cut using GC-200 strengthening core combination pliers, makes strain transducer probe assembly
The other end and the encapsulating structure flush with outer surface of battery 33, the other end and strain transducer of pair of strain sensors probe assembly are visited
One end end face of head optical fiber component is polished milled processed, and one end end face of strain transducer probe optical fiber component is aligned into one
End is arranged in the other end of the strain transducer probe assembly inside lithium ion battery 33 and carries out stranded connection.
2) strain transducer probe assembly and strain transducer probe optical fiber component are wrapped with polytetrafluoroethylene film
Wrap up in or the metal of resistant to hydrogen fluoric acid corrosion will be coated with the outside of strain transducer probe assembly and strain transducer probe optical fiber component
Material.
3) one end of strain transducer probe assembly is arranged in inside lithium ion battery 33, particular location is：First should
Change sensor probe 1 is arranged in the inside of lithium ion battery 33 and easily the corner of the negative pole 36 of stress concentration and barrier film 35 occurs,
The internal layer negative pole coating 38 of the negative pole 36 i.e. shown in Fig. 2 and the corner of barrier film 35；Second strain transducer probe the 2, the 3rd should
Become sensor probe 3, the 4th strain transducer the 4, the 5th strain transducer of popping one's head in pop one's head in the 5, the 7th strain transducer probe 7, the
Eight strain transducers probe the 8, the 9th strain transducer probe the 9, the tenth strain transducer the 10, the 11st strain transducer of probe is visited
First 11, the 13 and the 14th strain transducer of the 12, the 13rd strain transducer of the 12nd strain transducer probe probe 14 cloth of probe
The side central area that the thermal expansion in the charge and discharge process of lithium ion battery 33 easily causes stress concentration is put, specifically can be as needed
Every group (every group of each layer composition be followed successively by from outside to inside barrier film 35, negative pole coating 38, negative current collector 42, negative pole coating 38,
Barrier film 35, positive pole coating 37, plus plate current-collecting body 41, positive pole coating 37) near the side center cloth of internal layer negative pole coating 38
Put strain transducer probe；6th strain transducer probe 6 is arranged in the central area of lithium ion battery 33.
4) through hole of the diameter slightly larger than strain transducer probe assembly diameter is set at the upper lid of lithium ion battery 33.
5) strain transducer probe optical fiber component is drawn by lithium ion battery 33 by through hole, then through hole is close with scolding tin
Envelope.
6) encapsulated, encapsulation, fluid injection are carried out to lithium ion battery 33, the making of lithium ion battery 33 is completed.
2. will be disposed with the lithium ion battery 33 and lithium ion battery of the present invention of strain transducer probe assembly
The detection means of stress miscellaneous equipment connection, will strain transducer probe optical fiber component the other end and casing 29 in each
The input of the output end and analog-digital converter 30 of each strain transducer in the stranded connection of input of strain transducer, casing 29
End connection, the input connection of the output end and single-chip microcomputer 31 of analog-digital converter 30, the output end of single-chip microcomputer 31 is gone here and there by RS232
Mouth and host computer 32 are connected.
3. the internal stress of lithium ion battery 33 is measured
1) when lithium ion mobility of the external load function inside lithium ion battery 33 or lithium ion battery 33 and there is heat
When stress is produced, there is micro-bend disturbance in optical fiber, optical signal sends from light source under stress, and strain transducer probe assembly connects
The radiation detection of light source is received to optical signal, the optical signal that strain transducer probe assembly is detected is popped one's head in light by strain transducer
Fine component reaches the strain transducer in lithium ion battery external box of microvave 29；
2) optical signal prosessing is transformed into voltage signal and is amplified by optical signal through the strain transducer in casing 29, it
Low-pass filtering treatment is carried out to the voltage signal for amplifying afterwards, the voltage signal after treatment reaches analog-digital converter 30；
3) each voltage signal that analog-digital converter 30 will be received is changed into the data signal that can be processed with computing, number
Word signal reaches single-chip microcomputer 31 through the output end of analog-digital converter 30；
4) after single-chip microcomputer 31 carries out sequential operation, treatment to data signal and demarcates, sent to upper by RS232 serial ports
Machine 32,
5) after host computer 32 is processed can display lithium ion battery 33 each position internal strain numerical value, the lithium that will be measured from
The numerical value of sub- battery each position internal strain is multiplied by its elastic modelling quantity, and each is detected to calculate lithium ion battery by mathematical method
The inner-stress value at position.
The present invention is easy by strain transducer probe embedment inside lithium ion cell in the preparation process of lithium ion battery 33
There is the corner of the negative pole 36 of stress concentration and the corner of barrier film 35, i.e. the internal layer negative pole coating 38 of negative pole 36 and barrier film 35
Thermal expansion causes the side central area of stress concentration in place, lithium ion battery charge and discharge process, specifically can as needed every
(every group of each layer composition is followed successively by barrier film 35, negative pole coating 38, negative current collector 42, negative pole coating 38, barrier film to group from outside to inside
35th, positive pole coating 37, plus plate current-collecting body 41, positive pole coating 37) being arranged near the side center of internal layer negative pole coating 38 should
Become sensor probe, and lithium ion battery 33 central area, when lithium ion battery be subject to external load function or lithium-ion electric
During lithium ion mobility inside pond and when thering is thermal stress to produce, strain transducer probe assembly is popped one's head in by strain transducer
Optical fiber component is connected to each strain transducer, analog-digital converter 30, the and of single-chip microcomputer 31 in lithium ion battery external box of microvave 29
Host computer 32, so as to the situation of change of each position internal strain of real-time testing lithium ion battery, the lithium ion battery that will be measured
The numerical value of each position internal strain is multiplied by its elastic modelling quantity, and lithium ion battery each detection position is calculated by mathematical method
Inner-stress value.There is provided it is a kind of it is simple and easy to do, be easy to collection, can accurate in real time, multimetering lithium ion battery internal stress inspection
Device and measuring method are surveyed, energy real-time judge goes out the too high position of lithium ion battery internal stress, and then optimizes lithium ion battery
Technique and structure design；Moreover it is possible to the more accurate distributed in three dimensions situation for obtaining lithium ion battery internal stress, is lithium ion
The foundation of battery internal stress threedimensional model provides more effective data.
Claims (10)
1. a kind of detection means of lithium ion battery internal stress, it is characterised in that the detection of described lithium ion battery internal stress
Device includes strain transducer probe assembly, strain transducer probe optical fiber component, casing (29), analog-digital converter (30), list
Piece machine (31) and host computer (32)；
One end of described strain transducer probe assembly is arranged in the inside of lithium ion battery (33), strain transducer probe group
The output end and strain transducer of part are popped one's head in the stranded connection in one end of optical fiber component, strain transducer probe optical fiber component it is another
The stranded connection of input of each strain transducer in end and casing (29), the output end of interior each strain transducer of casing (29)
Input with analog-digital converter (30) is connected, the input connection of the output end and single-chip microcomputer (31) of analog-digital converter (30),
The output end of single-chip microcomputer (31) is connected by RS232 serial ports and host computer (32).
2. according to the detection means of the lithium ion battery internal stress described in claim 1, it is characterised in that described strain sensing
The inside that one end of device probe assembly is arranged in lithium ion battery (33) refers to：
Described strain transducer probe assembly includes 6~14 strain transducer probes, i.e., visited including the first strain transducer
Head (1), the second strain transducer probe (2), the 3rd strain transducer probe (3), the 4th strain transducer probe (4), the 5th
Strain transducer is popped one's head in (5), the 6th strain transducer is popped one's head in (6) ... with the 14th strain transducer probe (14)；
First strain transducer probe (1) is arranged in lithium ion battery (33) and the negative pole (36) of stress concentration and barrier film (35) occurs
Corner, i.e. the corner of internal layer negative pole coating (38) of negative pole (36) and barrier film (35)；Second strain transducer is popped one's head in
(2), the 3rd strain transducer probe (3), the 4th strain transducer probe (4), the 5th strain transducer probe (5), the 7th answer
Become sensor probe (7), the 8th strain transducer probe (8), the 9th strain transducer probe (9), the tenth strain transducer to visit
Head (10), the 11st strain transducer probe (11), the 12nd strain transducer probe (12), the 13rd strain transducer probe
(13) thermal expansion causes stress in being arranged in lithium ion battery (33) charge and discharge process with the 14th strain transducer probe (14)
The side central area of concentration；6th strain transducer probe (6) is arranged in the central area of lithium ion battery (33).
3. according to the detection means of the lithium ion battery internal stress described in claim 2, it is characterised in that the first described strain
Sensor probe (1), the second strain transducer probe (2), the 3rd strain transducer probe (3), the 4th strain transducer probe
(4), the 5th strain transducer probe (5), the 6th strain transducer probe (6) ... with the 14th strain transducer pop one's head in
(14) fibre optic strain sensor probe is, probe external diameter is 0.1mm~0.125mm.
4. according to the detection means of the lithium ion battery internal stress described in claim 1, it is characterised in that described strain sensing
Device probe assembly output end and strain transducer probe optical fiber component one end it is stranded connection refer to：
Described strain transducer probe assembly includes 6~14 strain transducer probes, i.e., visited including the first strain transducer
Head (1), the second strain transducer probe (2), the 3rd strain transducer probe (3), the 4th strain transducer probe (4), the 5th
Strain transducer is popped one's head in (5), the 6th strain transducer is popped one's head in (6) ... with the 14th strain transducer probe (14)；
Described strain transducer probe optical fiber component includes the first optical fiber (15), the second optical fiber (16), the 3rd optical fiber (17), the
Four optical fiber (18), the 5th optical fiber (19), six fiberses (20) ... with the 14th optical fiber (28)；
First strain transducer probe (1), the second strain transducer probe (2), the 3rd strain transducer probe (3), the 4th answer
Change sensor probe (4), the 5th strain transducer are popped one's head in (5), the 6th strain transducer is popped one's head in (6) ... with the 14th strain
The output end of sensor probe (14) successively with the first optical fiber (15), the second optical fiber (16), the 3rd optical fiber (17), the 4th optical fiber
(18), the 5th optical fiber (19), six fiberses (20) ... the stranded connection in one end with the 14th optical fiber (28).
5. according to the detection means of the lithium ion battery internal stress described in claim 4, it is characterised in that the first described optical fiber
(15), the second optical fiber (16), the 3rd optical fiber (17), the 4th optical fiber (18), the 5th optical fiber (19), six fiberses (20) ... with
14th optical fiber (28) uses low-loss single-mode fiber, and size is that 9/125 μm, i.e. optical fiber core diameter are 9 μm, diameter after covering
It is 125 μm.
6. according to the detection means of the lithium ion battery internal stress described in claim 1, it is characterised in that described strain sensing
The stranded connection of input of each strain transducer refers in the other end and casing (29) of device probe optical fiber component：
Described strain transducer probe optical fiber component includes the first optical fiber (15), the second optical fiber (16), the 3rd optical fiber (17), the
Four optical fiber (18), the 5th optical fiber (19), six fiberses (20) ... with the 14th optical fiber (28)；
Be provided with described casing (29) in 6~14 strain transducers, i.e. casing (29) be provided with the first strain transducer,
Second strain transducer, the 3rd strain transducer, the 4th strain transducer, the 5th strain transducer, the 6th strain sensing
Device ... with the 14th strain transducer；
First optical fiber (15), the second optical fiber (16), the 3rd optical fiber (17), the 4th optical fiber (18), the 5th optical fiber (19), six fiberses
(20) ... the other end with the 14th optical fiber (28) is strained with the first strain transducer, the second strain transducer, the 3rd successively
Sensor, the 4th strain transducer, the 5th strain transducer, the 6th strain transducer ... with the 14th strain transducer
The stranded connection of input.
7. the method that a kind of detection means of use lithium ion battery internal stress measures lithium ion battery internal stress, its feature exists
It is as follows the step of, the method for described measurement lithium ion battery internal stress：
1) lithium ion battery (33) is made
(1) strain transducer probe assembly is cut using GC-200 strengthening core combination pliers, makes the another of strain transducer probe assembly
One end and battery packaging structure flush with outer surface, the other end and strain transducer the probe light of pair of strain sensors probe assembly
One end end face of fine component is polished milled processed, and one end end face of strain transducer probe optical fiber component is aligned into one end cloth
Put the other end in the strain transducer probe assembly of inside lithium ion cell and carry out stranded connection；
(2) with polytetrafluoroethylene film by strain transducer probe assembly and strain transducer pop one's head in optical fiber component wrapped up or
The metal material of resistant to hydrogen fluoric acid corrosion will be coated with the outside of strain transducer probe assembly and strain transducer probe optical fiber component；
(3) one end of strain transducer probe assembly is arranged in lithium ion battery (33) inside；
(4) through hole of the diameter greater diameter than strain transducer probe assembly is set at lid on lithium ion battery (33)；
(5) strain transducer probe optical fiber component is drawn by lithium ion battery (33) by through hole, then through hole is sealed with scolding tin；
(6) encapsulated, encapsulation, fluid injection are carried out to lithium ion battery (33), the making of lithium ion battery (33) is completed；
2) inspection of the lithium ion battery (33) and described lithium ion battery internal stress of strain transducer probe assembly will be disposed with
Survey device miscellaneous equipment connection, will strain transducer probe optical fiber component the other end and casing (29) in each strain pass
The input of the output end of each strain transducer and analog-digital converter (30) in the stranded connection of input of sensor, casing (29)
Connection, the input connection of the output end and single-chip microcomputer (31) of analog-digital converter (30), the output end of single-chip microcomputer (31) passes through
RS232 serial ports and host computer (32) are connected；
3) internal stress of measurement lithium ion battery (33).
8. according to described in claim 7 measurement lithium ion battery internal stress method, it is characterised in that described measurement lithium from
The step of sub- battery (33) internal stress, is as follows：
1) when external load function is in the internal lithium ion mobility of lithium ion battery (33) or lithium ion battery (33) and there is heat
When stress is produced, there is micro-bend disturbance in optical fiber, optical signal sends from light source under stress, and strain transducer probe assembly connects
The radiation detection of light source is received to optical signal, the optical signal that strain transducer probe assembly is detected is respectively by strain transducer spy
Head optical fiber component reaches the strain transducer in lithium ion battery (33) external box of microvave (29)；
2) optical signal prosessing is transformed into voltage signal and is amplified by optical signal through the strain transducer in casing (29), afterwards
Voltage signal to amplifying carries out low-pass filtering treatment, and the voltage signal after treatment reaches analog-digital converter (30)；
3) each voltage signal that analog-digital converter (30) will be received is changed into the data signal that can be processed with computing, numeral
Signal reaches single-chip microcomputer (31) through the output end of analog-digital converter (30)；
4) after single-chip microcomputer (31) carries out sequential operation, treatment to data signal and demarcates, sent to host computer by RS232 serial ports
(32)；
5) numerical value of lithium ion battery (33) each position internal strain, the lithium ion that will be measured are shown after host computer (32) treatment
The numerical value of battery (33) each position internal strain is multiplied by its elastic modelling quantity, and it is each to calculate lithium ion battery (33) by mathematical method
The inner-stress value of individual detection position.
9. according to the method for the measurement lithium ion battery internal stress described in claim 7, it is characterised in that described strain sensing
Device probe assembly includes 6~14 strain transducer probes, i.e., including the first strain transducer probe (1), the second strain sensing
Device probe (2), the 3rd strain transducer probe (3), the 4th strain transducer are popped one's head in (4), the 5th strain transducer is popped one's head in (5),
6th strain transducer probe (6) ... with the 14th strain transducer probe (14)；
Described strain transducer probe optical fiber component includes the first optical fiber (15), the second optical fiber (16), the 3rd optical fiber (17), the
Four optical fiber (18), the 5th optical fiber (19), six fiberses (20) ... with the 14th optical fiber (28).
10. according to the method for the measurement lithium ion battery internal stress described in claim 7, it is characterised in that described will strain
One extremity piece of sensor probe component is arranged in inside lithium ion battery (18)：
First strain transducer probe (1) is arranged in lithium ion battery (33) and the negative pole (36) of stress concentration and barrier film (35) occurs
Corner, i.e. the corner of internal layer negative pole coating (38) of negative pole (36) and barrier film (35)；Second strain transducer is popped one's head in
(2), the 3rd strain transducer probe (3), the 4th strain transducer probe (4), the 5th strain transducer probe (5), the 7th answer
Become sensor probe (7), the 8th strain transducer probe (8), the 9th strain transducer probe (9), the tenth strain transducer to visit
Head (10), the 11st strain transducer probe (11), the 12nd strain transducer probe (12), the 13rd strain transducer probe
(13) and the 14th strain transducer probe (14) be arranged in lithium ion battery (33) charge and discharge process in thermal expansion cause stress
The side central area of concentration；6th strain transducer probe (6) is arranged in the central area of lithium ion battery (33).
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