CN101334451B - Digital type battery internal resistance test method - Google Patents
Digital type battery internal resistance test method Download PDFInfo
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- CN101334451B CN101334451B CN2007101295024A CN200710129502A CN101334451B CN 101334451 B CN101334451 B CN 101334451B CN 2007101295024 A CN2007101295024 A CN 2007101295024A CN 200710129502 A CN200710129502 A CN 200710129502A CN 101334451 B CN101334451 B CN 101334451B
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- battery
- internal resistance
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Abstract
The invention relates to a digital battery internal resistance test method which comprises a discharge resistor R and a discharge switch S0, and further comprises three controllable analog switches S1, S2 and S3, three capacitors C1, C2 and C3, two attenuation networks R1, R2 and R3, R4, a square wave oscillator OSC, a phase inverter F, an A/D converter and a display LCD. The test method has simple circuit and can directly display the internal resistance of a battery to be tested. The test precision is unrelated to the on-resistance of the discharge switch S0; therefore, the test precision is higher. Simultaneously, the test method can also measure the terminal voltage of the battery.
Description
Technical field
The present invention relates to a kind of method of testing of electrical parameter, especially for the method for test battery internal resistance.
Background technology:
The internal resistance of cell is an important parameter of reflection battery performance.The variation of the internal resistance of cell and inside battery pole plate, electrolytical variation are closely-related.Through measure the internal resistance of cell passable degree of aging and the variation of capacity of electrolytic cell, thereby repair or change the battery that will lose efficacy in time, guarantee the performance of power supply.
The internal resistance of cell has DC internal resistance and the branch that exchanges internal resistance, the method for testing of having nothing in common with each other.
Battery DC internal resistance conventional test methods is as shown in Figure 1, and E is the electromotive force of battery here, r
0Be the internal resistance of cell, R is a pull-up resistor, and S is a switch, and V is a voltage table.When switch S is opened a way, voltage table reading V1=E; When switch S is closed, voltage table reading V2=ER/ (R+r
0). by V1, V2 can calculate the internal resistance of cell
r
0＝(V1-V2)R/V2(1)
Measure the internal resistance of cell in this way and need measure the open-circuit voltage V1 and the load-carrying terminal voltage V2 of battery respectively through the measurement of two steps; And draw the internal resistance of cell through hand computation.Operate pretty troublesomely, automaticity is low.In addition, when this method was measured, meetings such as the conducting resistance of switch S, connection resistance impacted measurement.Especially when discharge current is big, the numerical value of resistance R will be less, and at this moment, the error that K switch is introduced is just very big, sometimes even reach more than 50%.So error greatly also is one of its defective.
Summary of the invention
The present invention is directed to the existing deficiency of prior art, provide a kind of simple in structure, convenient test, accurate test result digital type battery internal resistance test method.The automatic measurement that it can be realized has higher measuring accuracy.
The present invention realizes through following technical scheme.
Fig. 2 is that the present invention is electrically connected block diagram when measuring the internal resistance of cell.
The battery internal resistance test method that the present invention proposes comprises discharge resistance R and discharge switch S0, it is characterized in that: three controllable simulation switch S 1, S2, S3 are arranged, three capacitor C 1, C2, C3, two-way attenuation network R1, R2 and R3, R4; A square-wave oscillator OSC, a phase inverter F, an A/D converter, a display lcd; The attenuation coefficient of two-way attenuation network equates, is K; The end of discharge resistance R is connected to the positive pole of tested battery, and the other end is received the negative pole of battery through discharge switch S0; Analog switch S1 one end is received tested anode through attenuation network R1, R2, and the other end is received the Vr+ and the Vi of A/D converter
-Hold, and be connected to the negative pole of battery through capacitor C 1; Analog switch S2 one end is received tested anode through attenuation network R1, R2, and the other end is received the Vi of A/D converter
+Hold, and be connected to the negative pole of battery through capacitor C 2; Analog switch S3 one end is received the contact of discharge resistance R and discharge switch S0 through attenuation network R3, R4, and the other end is received the Vr-end of A/D converter, and is connected to the negative pole of battery through capacitor C 3; When square-wave oscillator is output as low level, analog switch S2 conducting, at this moment, the input end Vi of A/D converter
+The open circuit electromotive force E of voltage and battery between following relation is arranged,
Vi
+＝E·K (2)
Wherein: K is an attenuation coefficient, K=R2/ (R1+R2)=R4/ (R3+R4)
[noting: ignore (R1+R2) and reach (R3+R4) shunt influence of branch road when measuring]
When square-wave oscillator is output as high level, S0, S1, three analog switch conductings together of S3, at this moment, the reference edge Vr of A/D converter
+, Vr
-With input end Vi
+Voltage be respectively:
Vr
+＝Vi
-＝(E-I·r
0)K (3)
Vr
-＝[E-I(r
0+R)]K (4)
Wherein: I is the electric current that flows through discharge resistance R;
r
0Be the internal resistance of cell.
The reading N of A/D converter output, promptly the displayed value on the LCD is:
N＝(Vi
+-Vi
-)/(Vr
+-Vr
-)
＝I·r
0/IR＝r
0/R (5)
This shows, as long as the numerical value of discharge resistance R is taken as 10 integral multiple, then the LCD displayed value with regard to direct representation the internal resistance value of tested battery.
During measuring voltage, circuit is evolved into the form of Fig. 4.At this moment, R1, R2 constitute an attenuation network, and decay coefficient K is 10 negative integer time power; R5, R6 then reduce to 1V to V+ from 3V and supply with reference voltage Vr
+If decay coefficient K is taken as 0.1, the voltage table that it is 20V that entire circuit becomes a range; If the voltage table that K is taken as 0.01 just to become a range be 200V.
Outstanding feature of the present invention is: this method of testing circuit is simple, can directly demonstrate the internal resistance value of measured battery.Its measuring accuracy and discharge switch S
0Conducting resistance irrelevant, therefore, have higher measuring accuracy.Simultaneously.It can also measure the terminal voltage of battery.
Description of drawings
Fig. 1 is traditional battery internal resistance test method.
Fig. 2 is that the measurement internal resistance of cell of the present invention is electrically connected block diagram.
Fig. 3 is the block diagram that is electrically connected of the embodiment of the invention.
Equivalent-simplification figure when Fig. 4 is measuring voltage.
Embodiment
Shown in Figure 2 is one embodiment of the present of invention.Wherein E is the electromotive force of battery, r
0Be the internal resistance of cell, R is a discharge resistance, and S0 is a discharge switch, can adopt elements such as triode, FET or IGBT; S1-S7 is an analog switch, can adopt CD4066; A/D converter can adopt GC7238, the A/D converter of ICL7106 or models such as 9721; When adopting GC7238, square wave oscillator OSC and phase inverter F can directly adopt IC inner BP and BP terminal, and they are square-wave signal sources of two anti-phases each other.C1, C2, three capacitances of C3 are 0.1 μ F～1 μ F.R1, R2 and R3, R4 constitute two attenuation networks that characteristic is consistent, and attenuation coefficient is 10 negative integer time power, and its concrete attenuation ratio is decided by the magnitude of voltage of measured battery, if measure the battery below the 20V, attenuation coefficient is 0.1; Measure the battery below the 200V, attenuation coefficient 0.01, the rest may be inferred by analogy.The value of discharge resistance R is 10 integral number power; The span of R1, R2 and R3, R4 can be more than 1K Ω, to reduce measuring error.
Analog switch S1 one end is received tested anode through the attenuation network that R1, R2 form, and the other end is received the Vr+ and the Vi of A/D converter
-Hold, and be connected to the negative pole of battery through capacitor C 1; Analog switch S2 one end is also received tested anode through the attenuation network that R1, R2 form, and the other end is received the Vi of A/D converter
+Hold, and be connected to the negative pole of battery through capacitor C 2; The attenuation network that analog switch S3 one end is formed through R3, R4 is received the contact of discharge resistance R and discharge switch S0, and the other end is received the Vr of A/D converter
-Hold, and be connected to the negative pole of battery through capacitor C 3; The control end of S0, S1, three analog switches of S3 links together, and is connected to the output terminal BP of square-wave oscillator OSC; The control end of S2 is connected to square-wave oscillator OSC (being the BP end) through phase inverter F; A/D converter inside has stabilized voltage supply, and its V+ end has the burning voltage of 3V over the ground, and its output is connected to display lcd.S8 is a single-pole double-throw switch (SPDT), and it is dialled to " Ω " side when measuring internal resistance; At this moment, the S6 conducting is with Vr+ and Vi-short circuit.Circuit is evolved into internal resistance of cell test mode shown in Figure 2.Will directly demonstrate the internal resistance value of tested battery on the LCD LCD.
During measuring voltage, S8 dials the side to " V ", and at this moment circuit is evolved into Fig. 4, constitutes a D.C. voltmeter, can carry out battery voltage measurement.
Claims (3)
1. a battery internal resistance test method comprises discharge resistance R and discharge switch S0, it is characterized in that: three controllable simulation switch S 1, S2, S3 are arranged, three capacitor C 1, C2, C3, two-way attenuation network R1, R2 and R3, R4; A square-wave oscillator OSC, a phase inverter F, an A/D converter, a display lcd; The end of discharge resistance R is connected to the positive pole of tested battery, and the other end is received the negative pole of battery through discharge switch S0; Attenuation network R1, R2 are connected in series, and wherein the end of R1 is connected with anode, and the other end of R1 is connected with the end of R2, and the other end of R2 is connected with the negative pole of battery, and the contact of R1, R2 series connection is connected with the end of analog switch S1; The other end of analog switch S1 is received the Vr+ and the Vi-end of A/D converter, and is connected to the negative pole of battery through capacitor C 1; The end of analog switch S2 is connected to the tie point of R1, R2 series connection; The other end of analog switch S2 is received the Vi+ end of A/D converter, and is connected to the negative pole of battery through capacitor C 2; Attenuation network R3, R4 are connected in series, wherein the end of R3 be connected to discharge resistance R with the tie point of discharge switch S0, the other end of R3 is connected with the end of R4, the other end of R4 is connected with the negative pole of battery; The contact of R3, R4 series connection is connected with the end of analog switch S3; The other end of analog switch S3 is received the Vr-end of A/D converter, and is connected to the negative pole of battery through capacitor C 3.
2. battery internal resistance test method according to claim 1 is characterized in that: the attenuation coefficient of two-way attenuation network equates, is K;
3. battery internal resistance test method according to claim 2 is characterized in that: the decay coefficient K of two-way attenuation network is 10 negative integer time power.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007101295024A CN101334451B (en) | 2007-06-26 | 2007-06-26 | Digital type battery internal resistance test method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007101295024A CN101334451B (en) | 2007-06-26 | 2007-06-26 | Digital type battery internal resistance test method |
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|---|---|
| CN101334451A CN101334451A (en) | 2008-12-31 |
| CN101334451B true CN101334451B (en) | 2012-05-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2007101295024A Expired - Fee Related CN101334451B (en) | 2007-06-26 | 2007-06-26 | Digital type battery internal resistance test method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108614220B (en) * | 2018-05-14 | 2019-09-20 | 浙江大学 | A kind of accumulator internal resistance measurement method based on damped oscillation |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004198298A (en) * | 2002-12-19 | 2004-07-15 | Toshiba Battery Co Ltd | Battery capacity measuring instrument |
| US6768309B2 (en) * | 2002-11-25 | 2004-07-27 | Leonard N Liebermann | Electronic battery condition tester |
| CN1882843A (en) * | 2003-12-04 | 2006-12-20 | 保诚电子工程有限公司 | Battery cell voltage and impedance measuring circuit |
| CN200953037Y (en) * | 2006-09-28 | 2007-09-26 | 深圳市比克电池有限公司 | Electric source internal resistance test circuit |
-
2007
- 2007-06-26 CN CN2007101295024A patent/CN101334451B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6768309B2 (en) * | 2002-11-25 | 2004-07-27 | Leonard N Liebermann | Electronic battery condition tester |
| JP2004198298A (en) * | 2002-12-19 | 2004-07-15 | Toshiba Battery Co Ltd | Battery capacity measuring instrument |
| CN1882843A (en) * | 2003-12-04 | 2006-12-20 | 保诚电子工程有限公司 | Battery cell voltage and impedance measuring circuit |
| CN200953037Y (en) * | 2006-09-28 | 2007-09-26 | 深圳市比克电池有限公司 | Electric source internal resistance test circuit |
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| Publication number | Publication date |
|---|---|
| CN101334451A (en) | 2008-12-31 |
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Granted publication date: 20120530 Termination date: 20210626 |