CN2569158Y

CN2569158Y - Micro short-circuit detector

Info

Publication number: CN2569158Y
Application number: CN 02253493
Authority: CN
Inventors: 周恒辉; 陈继辉; 徐嘉祥
Original assignee: Pulead Technology Industry Co ltd
Current assignee: Pulead Technology Industry Co ltd
Priority date: 2002-09-05
Filing date: 2002-09-05
Publication date: 2003-08-27
Anticipated expiration: 2012-09-05

Abstract

The utility model relates to a micro short circuit detector which comprises a power circuit, an oscillating circuit, a coupling circuit, a direct current high voltage circuit and a test circuit, wherein the power circuit, the oscillating circuit, the coupling circuit, the direct current high voltage circuit and the test circuit are orderly connected. Current inputted from an external power supply is rectificated into high voltage direct current low current by the power circuit, the oscillating circuit, the coupling circuit and the direct current high voltage circuit, and then the low current acts on two electrodes to be measured. Thereby, the subtle change of the internal resistance of an object to be measured is fed back to a current meter and a buzzer of the test circuit. The utility model has the advantages of safety, simple structure, convenient operation, sensitive detection and high efficiency and is suitable for detecting the slight short circuit of lead acid batteries, nickel hydrogen batteries, nickel cadmium batteries, capacitors and particularly lithium ion batteries in experiments and production.

Description

The micro-short circuit tester

Technical field: the utility model relates to a kind of micro-short circuit pick-up unit, especially a kind of device applicable to micro-short circuit detection in lead-acid battery, Ni-MH battery, nickel-cadmium battery, capacitor, particularly li-ion battery experiment and the production.

Background technology: because at capacitor, battery, particularly in the research of lithium ion and the production, inner minute short circuit all may make battery or capacitor produce home loop in follow-up charge and discharge process, thereby cause it in charge and discharge process, to produce too much heat, and then may make its breaking-up even cause burning and blast, produce very big harm and loss, so the micro-short circuit detection is a very crucial step in assembling process, can in time divide and detect certified products and unacceptable product, so that stop unacceptable product to enter next step operation as early as possible, reduce unnecessary work, raise the efficiency and security, reduce loss.

The instrument that detects short circuit commonly used at present is a universal electric meter, but its sensitivity and resolution are all very low, when there is very faint short circuit behavior battery or capacitor inside, adopt this instrument just to be difficult to detect, and this inside has the battery of minute short circuit or capacitor will damage when discharging and recharging, even produce danger, cause waste and loss.

Summary of the invention: the purpose of this utility model is to provide a kind of simple, efficient, easy to operate and highly sensitive micro-short circuit pick-up unit for battery or capacitor.

Micro-short circuit tester of the present utility model comprises power circuit, oscillatory circuit, coupled circuit, dc high-voltage circuit and test circuit, and power circuit, oscillatory circuit, coupled circuit, dc high-voltage circuit and test circuit are for connecting in turn.

Power circuit is made up of external power supply and transformer, and test circuit is made up of micro aning ammeter, hummer and test pen.

External power supply enters oscillatory circuit through behind the power circuit, produce the sine wave signal of KHz by oscillatory circuit, enter coupled circuit then, via the little electric current of output hectovolt behind the coupled circuit, enter the high direct voltage rectification circuit again, export then that the hectovolt DC low current enters test circuit and determinand joins, the minute short circuit of determinand inside all can be reflected to microampere meter and hummer via test pen, thereby is detected.

Principle of the present utility model is that the current commutates of external power supply being imported by power circuit, oscillatory circuit, coupled circuit and dc high-voltage circuit is the little electric current of high voltage direct current, act on the two poles of the earth to be measured then, thereby the subtle change of determinand internal resistance is fed back on reometer and the hummer.

The utlity model has simple in structure, easy to operate, the detection sensitivity height, be quick on the draw, the efficient advantages of higher.

Description of drawings:

Fig. 1 principle schematic of the present utility model

1, power circuit 2, oscillatory circuit 3, coupled circuit

4, high direct voltage rectification circuit 5, determinand

Fig. 2 schematic appearance of the present utility model

11. main frame 12. microampere meters 13. detecting pens 14. power switches

15. status lamp 16. hummers 17. attaching plugs

Embodiment:

Referring to Fig. 2, attaching plug 17 is inserted in the socket of ground wire, turn on the power switch 14, status lamp 15 is bright, power connection, instrument is in running order; With the both positive and negative polarity of two test pens, 13 difference contact measured battery (or capacitor), if swinging a little, the pointer of microampere meter 12 promptly rests on zero point, illustrate that this battery is specification product, can enter next process; If the beat of pointer also maintains some non-zero values, illustrate that then this battery is defective, inner promising micro-short circuit phenomenon stops to enter next step operation.

Claims

1. a micro-short circuit tester comprises power circuit, oscillatory circuit, coupled circuit, dc high-voltage circuit and test circuit composition, it is characterized in that power circuit, oscillatory circuit, coupled circuit, dc high-voltage circuit and test circuit are to connect in turn.

2. micro-short circuit tester as claimed in claim 1 is characterized in that described power circuit is made up of external power supply and transformer.

3. micro-short circuit tester as claimed in claim 1 is characterized in that test circuit is made up of micro aning ammeter, hummer and test pen.

4. as claim 1 or 2 or 3 described micro-short circuit testers, it is characterized in that external power supply enters oscillatory circuit through behind the power circuit, produces the sine wave signal of KHz by oscillatory circuit.

5. micro-short circuit tester as claimed in claim 4 is characterized in that the signal that oscillatory circuit produces enters coupled circuit, by the little electric current of output hectovolt behind the coupled circuit.

6. micro-short circuit tester as claimed in claim 5 is characterized in that the little electric current of hectovolt of coupled circuit output enters the high direct voltage rectification circuit, exports the hectovolt DC low current then.

7. micro-short circuit tester as claimed in claim 6, the hectovolt DC low current that it is characterized in that high direct voltage rectification circuit output enters test circuit and determinand joins.