CN2315557Y - Inner pressure measurer for nickel-hydrogen battery - Google Patents

Abstract

The utility model relates to an instrument for measuring the inner voltage of a sealed cylinder cell. The utility model is composed of cell positioning fixtures, a precise micrometer, an analog/digital converter, a microcomputer, a display and a printer. Without a hole made on a cell case, the utility model is affixed with a strain gauge so that nondestructive measuring is achieved and can easily and accurately measuring the inner voltage of the sealed cylinder cell.

Description

The internal pressure of NiH battery tester

The utility model belongs to a kind of device of testing sealing cylinder Ni-MH battery internal gas pressure.

Some sealing cylinder battery is in charging process, inner meeting generation gas and pressure are bigger, thereby in the research of chemical cell and the size that how to detect internal pressure in producing be current general problem deeply concerned, for being that Ni-MH battery that negative pole easily produces gas records the inner pressure of battery necessity very that just seems fast and accurately with the hydrogen storage material.The common method of measuring at present the sealing cylinder inner pressure of battery has two kinds, the one, direct method, battery of promptly every survey all must on battery container, punch link to each other with rain glass record in the pressure value, this method had both been destroyed battery and troublesome poeration, measuring error is big; The 2nd, indirect method such as ess-strain method are pasted foil gauge on battery container, by measuring the resistance variations of foil gauge, press numerical value in realizing indirectly measuring, and this method is operation inconvenience equally, and it is bigger to produce error.

The purpose of this utility model provides a kind of accurate, easy, does not destroy battery container, does not also paste foil gauge, is applicable to the measurement mechanism of sealing cylinder inner pressure of battery in enormous quantities.

The utility model at first faces down the sealing cylinder battery floor and packs in the interior cutting ferrule of battery in place anchor clamps of the present invention, and interior cutting ferrule is packed in the outer cutting ferrule, screws with swivel nut, screws loam cake again.Then the battery in place anchor clamps are fixed on the stand, again with transducer probe assembly, also be fixed on the same stand by jig, its gauge head plane and battery bottom surface remain on the gap of 50～150 μ m, when the sealing cylinder battery is in charged state, and the inner gas that produces, make the housing internal gas pressure increasing, the shell deformation that causes battery, the result makes bottom surface and the interplanar distance of gauge head that little change take place, and this little change signal is admitted to microcomparator by gauge head.Little varying signal is after modulation, amplification, detection in input analog-to-digital converter and the microcomputer, handle through specific software again, with battery because the small amount of deflection of housing (being accurate to 0.01 μ m) that internal pressure produces is transformed into its numerical value of inner pressure of battery value (precision reaches 0.003Pa) and curve all is shown and prints.

The utility model is made up of three parts: first is the location and the chucking device of battery, comprise accurate micromotion platform and battery in place anchor clamps, the column of micromotion platform has two dops, and upper chuck is used for fixing the battery in place anchor clamps that are installed (figure two), dop is used for fixing the gauge head of sensor down.Upper and lower dop all can very critically be regulated and the spacing of self-contained battery bottom surface and gauge head.Second portion microcomparator (figure three), this instrument is made up of amplitude stabilizer oscillator, main amplifier, precision rectifer.Third part is made up of analog to digital converter and microcomputer and display, printer.

Figure one is the utility model functional-block diagram.1 is that the charge the battery direct supply of usefulness can provide 0～5V voltage among the figure, the 2nd, and tested cylindrical battery (being installed in the battery in place anchor clamps), the 3rd, the gauge head of mircrometer gauge sensor and drive cable, the 4th, microcomparator, the 5th, analog to digital converter, the 6th, microprocessor, the 7th, display, the 8th, printer.Figure two is the battery positioning fixtures that are installed: 9 is positive terminals among the figure, the 10th, battery in place anchor clamps loam cake, the 11st, the battery in place swivel nut, the 12nd, negative pole conductive connector (input end of double as microcomparator), the 13rd, cutting ferrule (tapering is arranged outward) in the battery cathode, the 14th, the outer cutting ferrule of battery cathode (in tapering is arranged, can closely cooperate) with the tapering of interior cutting ferrule 13.Figure three is the microcomparator schematic diagram.Amplitude stabilizer oscillator among the figure: amplitude is by A ₁And R ₁, R ₂, R ₃, C ₂, C ₃The wen-bridge oscillator of forming produces, and frequency is that 10K～20K is conspicuous, then through A ₂And R ₁₂, R ₁₃, C ₃The buffer amplifier of forming amplifies the fixed ampllitude oscillator signal, A ₃And D ₃, D ₄And R ₁₈, A ₄, C ₄, C ₅, R ₂₀, D ₁₆, R ₁₉Form the fixed ampllitude probe portion, by by A ₅, R ₇, R ₁₀And D ₁, D ₂, R ₄, R ₅The dynamic amplification coefficient part of forming is partly carried out the fixed ampllitude regulation and control to wien oscillator.Main amplifier: little change signal that transducer probe assembly (end of CT) will be recorded is through driving cable and amplitude stabilizer oscillator A ₂The oscillation signal of sending here enters together by T ₁And T ₂The prime amplifier of forming is again through C ₆And C ₂₇Send into A ₆Positive pole carry out voltage amplification, by A ₆Through C ₇, R ₂₉Send into A ₇Carry out power amplification output ground connection simultaneously again, R is passed through in the isolation that drives cable ₁₃Meet amplitude stabilizer oscillator A ₂Negative pole, and ground connection.Send into precision rectifer then and carry out the detection rectification, simultaneously signal is delivered to tested battery cathode (other end of CT) and formed the negative feedback amplification.Precision rectifer: the signal of being sent here by amplifier enters A ₈, 2CK ₁₄, the inverting amplifier formed of 2CK carries out the detection rectification, again through A ₉, C ₁₂, R ₄₁The amplifier of forming amplifies, and shows numerical value by dc digital voltmeter at last.

The utility model is owing to adopt non-contact method to measure, the device that the stickup foil gauge is pressed in measuring on punching dress table measurement mechanism on battery different from the past and the battery, thereby make measuring method convenient, accurate, do not destroy battery container, be the non-destroyed measurement system, improved efficient and measuring accuracy greatly, be fit to the sealing cylinder battery and produce upward application in enormous quantities.

Embodiment: with the AA type Ni-MH battery interior cutting ferrule of packing into, put into outer cutting ferrule, screw with swivel nut, this moment battery cathode and negative pole wiring conducting, again loam cake is screwed in the swivel nut upper end, make the positive pole and the positive terminal conducting of battery, then the battery in place anchor clamps are stuck on the upper chuck of stand, again the gauge head of sensor is stuck under the stand on the dop, the distance of adjusting battery bottom surface and gauge head plane is between 50～150 μ m, and this moment, the numeral at microcomparator was shown as 5～15V, charged to Ni-MH battery then, along with the carrying out of charging, the interior pressure variation of battery promptly shows after MICROCOMPUTER PROCESSING with the time relation curve or has printed.

Claims (3)

1. its feature of sealing cylinder internal pressure of NiH battery tester comprises: battery in place anchor clamps, microcomparator, analog to digital converter, microcomputer, display and printer; Wherein the battery in place anchor clamps are fixed on the stand, transducer probe assembly also is fixed on this stand, and can keep fine pitch with the battery bottom surface, transducer probe assembly links to each other with microcomparator, microcomparator links to each other with analog to digital converter again, analog to digital converter links to each other with microcomputer, is that microcomputer links to each other with display, printer at last.

2. inner pressure of battery tester according to claim 1 is characterized in that: the battery in place anchor clamps comprise that interior cutting ferrule 13 (tapering is arranged) and outer cutting ferrule 14 (in tapering is arranged) two is enclosed within the effect of locating swivel nut 11 outward and closely cooperate, positive terminal 9, negative pole conductor wire binding post 12,, there is the upper plastic cover 10 of conductive pole in generation, can freely screw in swivel nut upper end, location.

3. inner pressure of battery tester according to claim 1 is characterized in that: survey sensor gauge head 3 (i.e. the end of CT among the figure) connects the driving cable in the main amplifier part of microcomparator.The separation layer of its cable passes through R ₁₃Meet the A of fixed ampllitude vibration ₂Negative pole, and ground connection.Cable center's axis and C ₅And R ₂₅Meet field effect transistor T together ₁Grid, T ₁Drain electrode pass through R ₂₆Link to each other with+15V power supply.Pass through R in addition ₂₄With triode T ₂Emitter links to each other, T ₁Source electrode passes through R ₂₃With T ₂Base stage links to each other, direct simultaneously and T ₂Collector links to each other.T ₂Base stage also meet+15V T in addition ₂The emitter of pipe passes through capacitor C ₆And R ₂₇With A ₆Anodal continuous, A ₆Negative pole pass through R ₂₈Link to each other with pin 6, pin 6 passes through C simultaneously ₇And R ₃₀Receive A ₇Positive pole on, A ₇Negative pole pass through R ₃₁And A ₇Pin 6 links to each other C ₈And C ₉The series connection back also is connected in R ₃₁On, A ₇Pin 6 also pass through C ₁₀The negative pole (end of CT) that connects tested battery passes through C simultaneously ₁₀And R ₃₇With A ₈Anodal linking to each other, the spacing at CT two ends is exactly the spacing on battery bottom surface and transducer probe assembly plane.

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