CN2881665Y

CN2881665Y - Power battery analyzer

Info

Publication number: CN2881665Y
Application number: CN 200520120083
Authority: CN
Inventors: 朱德鹏
Original assignee: BYD Co Ltd
Current assignee: BYD Co Ltd
Priority date: 2005-12-09
Filing date: 2005-12-09
Publication date: 2007-03-21
Anticipated expiration: 2015-12-09

Abstract

The utility model relates to a power battery performance analysis and test device, particularly relates to a power battery intelligent analyzer for the electric vehicle. A power battery analyzer, includes: a sampling circuit is composed of the sampling channel, an isolation amplifier, filter circuit; an intelligent control circuit, is composed of the gate circuit, the microprocessor, which handle the filter circuit output; the button display control circuit is composed of a button circuit, a drive display circuit, which handle the microprocessor and button circuit output. Because of the practical use of the intelligent digital control technology, through the control button, the utility model can achieve the control operation, improve system efficiency; achieve the automatic recording for the discharge time, real-time detect and display the battery state; greatly reduce the system interference, can accurately calculate the discharge of electricity; has also the advantages of small size, light weight, easy-to-use.

Description

A kind of electrokinetic cell analyser

[technical field]

The utility model relates to the device that battery performance is carried out analytical test, particularly the intelligence instrument that power battery of electric vehicle is analyzed.

[background technology]

More at the like product of battery of mobile phone analysis at present, but do not have the product of specialty at electric vehicle electrokinetic cell intellectual analysis.For electrokinetic cell, adopt manual testing's method more, its defective is: 1. for the calculating of discharge electricity amount very out of true, take electric current integration in time to calculate, but current spikes is excessive, result of calculation has than mistake.2. for can only taking discharge time manual method to carry out record, when battery begins discharge gage, provide the discharge prevention signal and finish discharge to lithium electric protection chip S-8241, must keep an eye on by the special messenger, writing time, efficient is low and influence result's accuracy.3. can not detect and show battery condition in real time,, can only pass through the multimeter manual measurement as voltage, discharge current, discharge time.

[summary of the invention]

The purpose of this utility model is to provide a kind of the realize automatic record of discharge time, the real-time detection and the demonstration of battery condition, but and the electrokinetic cell analyser of accurate Calculation discharge electricity amount.

The technical scheme that its technical matters that solves the utility model adopts is: a kind of electrokinetic cell analyser comprises:

Sample circuit is by the sampling channel that each electrokinetic cell is sampled, the isolated amplifier that links to each other with sampling channel, filter circuit for filtering is carried out in the output of isolated amplifier form;

Intelligence control circuit, the microprocessor of handling by the gating circuit that described sampling channel is carried out gating, to the output of described filtering circuit is formed;

The button display control circuit, the driving display circuit of handling by key circuit, to the output of described microprocessor and key circuit is formed.

Further, comprise photoelectric switch in the described sampling channel, described microprocessor is controlled the open/close state of photoelectric switch by the control gating circuit.

In the utility model device, load is connected on the two ends of the series arm of electrokinetic cell to be analyzed and sampling resistor formation, and corresponding with the sampling channel respectively sampling terminal in the two ends of every batteries and the two ends of sampling resistor links to each other.

Described filtering circuit is the secondary filtering circuit, is made up of operational amplifier U61A and peripheral circuit thereof.

Further, the built-in A/D converter of described microprocessor.

As another kind of embodiment of the present utility model, also comprise A/D converter, be connected between filtering circuit and the microprocessor.

The advantage of electrokinetic cell analyser described in the utility model is: 1. owing to adopted the intelligent digital control technology, just can realize control operation by button, improve system effectiveness; 2. realized the automatic record of discharge time, the real-time detection and the demonstration of battery status; 3. special, in sampling channel, added isolated amplifier and second-order filter circuit, greatly reduced system interference, but the accurate Calculation discharge electricity amount; 4. also has volume advantage little, in light weight, easy to use.

[description of drawings]

Fig. 1 is a circuit structure block diagram of the present utility model.

Fig. 2 is the circuit structure schematic diagram of sampling channel in the sample circuit in the utility model.

Fig. 3 is the structure principle chart of isolating amplification and filtering circuit in the utility model in the sample circuit.

Fig. 4 is the circuit structure schematic diagram of intelligence control circuit in the utility model.

Fig. 5 is the circuit structure schematic diagram of key circuit in the button display control circuit in the utility model.

Fig. 6 is the circuit structure schematic diagram of other circuit in the button display control circuit in the utility model.

[embodiment]

With specific embodiment the utility model is further elaborated with reference to the accompanying drawings below.

As shown in Figure 1, a kind of electrokinetic cell analyser of the utility model mainly comprises sample circuit 1, intelligence control circuit 2 and button display control circuit 3 three parts.Be that example describes the utility model circuit can test 15 joint electrokinetic cells simultaneously below.

As shown in Figures 2 and 3, sample circuit 1 comprises sampling channel 11, isolated amplifier 12 and filtering circuit 13, wherein, also comprises a rectifying and wave-filtering network 14 between sampling channel 11 and the isolated amplifier 12.Sampling channel 11 is used to gather the voltage (analog quantity) and the discharge current value of each electrokinetic cell to be measured.Electrokinetic cell to be analyzed is connected the back and is electric with sampling resistor RS, the two ends of sampling resistor RS and every batteries link to each other with sampling channel 11 corresponding sampling terminals (B0-Bn) (n≤15) respectively.Each data that terminal collected of sampling is carried out first filtering through a resistance-capacitance network earlier, pass through photoelectric switch, be input to rectifying and wave-filtering network 14 and carry out secondary filtering, again after isolated amplifier 12 is isolated amplification, carry out three filtering output by filtering circuit 13, the interference of at utmost low reduction system guarantees that follow-up A/D converter 23 can work exactly.In the utility model preferred embodiment, filtering circuit 13 adopts second-order filter circuit 13 (being made up of operational amplifier U61A and peripheral circuit thereof) commonly used, and isolated amplifier 12 adopts ISO1002 isolated amplifier 12.Also adopt two transitions to suppress diode ESDA5 in the rectifying and wave-filtering network 14 and form parastat, to eliminate the interference of static system.

As shown in Figure 4, intelligence control circuit 2 mainly comprises gating circuit 21 and microprocessor 22.In the present embodiment, microprocessor 22 adopts the AT89C52 that does not have built-in A/D converter 23, therefore need add an A/D converter TLC2543, and the analog signal conversion that is used for sample circuit 1 output is that digital signal outputs to microprocessor 22 processing.Gating circuit 21 adopts two eightfold Darlington rp-drive ULN2803 to form 16 road gating control ends (VC0-VC15), its output links to each other with the control end of photoelectric switch in the sample circuit 1 respectively, and its input end links to each other with the I/O output terminal (IO1-IO16) of microprocessor 22P0 mouth and P2 mouth respectively.Microprocessor 22 output high level are to ULV2803, thus the appointment photoelectric switch in the gating sample circuit 1, and the sampled data or the discharge current value of electrokinetic cell specified in 1 output of control sample circuit.Above-mentioned sampled data is by the AIN0 mouth input of A/D converter 23, be input in the microprocessor 22 after being converted to digital signal, 22 pairs of above-mentioned data of microprocessor are handled, calculate discharge electricity amount, to carrying out calendar scheduling discharge time, export corresponding data (as voltage, discharge current, discharge time etc.) in button display control circuit 3, by the P10 pin of P0 mouth again to control the demonstration of each cell voltage, discharge current, discharge electricity amount.The interrupt control end INT0 of microprocessor 22 also protects the look-at-me end in the chip to link to each other with electrokinetic cell; when discharge finishes; electrokinetic cell protection chip sends look-at-me for microprocessor 22; timeing closing/counter; write down discharge time; when interdischarge interval breaks down, can realize that also discharge stops automatically.

As shown in Figure 5 and Figure 6, button display control circuit 3 comprises key circuit 31 and drives display circuit 32.Key circuit 31 adopts 4*5 keyboard array (can determine number of keys voluntarily according to the software needs, this equipment can be supported the 8*8 keyboard array at most), is used to provide the discharge beginning and shows control command.As seen from the figure, one side of key circuit 31 links to each other with five output pins of shift register 74LS164 in the display control circuit 3 by the S00-S04 node, and its another side links to each other with four output pins of LED driving display chip BC7280/81 in the display control circuit 3 by the DIG0-DIG3 node.In the present embodiment, the display part adopts LED to show, one skilled in the art will appreciate that also and can adopt liquid crystal display, but cost is higher.Drive display circuit 32 and comprise that LED drives display chip BC7280/81,8 bit parallels output serial-in shift register 74LS164,8 triodes are total to positive digital display tube GEM5461AE for 8050,2 four seven sections, and the peripheral circuit of each chip.Wherein, four seven sections eight input ends (A-G and CP end) that are total to positive digital display tube link to each other with the output terminal of shift register 74LS164.Three signal wires of DAT, CLK, KEY that drive display chip BC7280/81 link to each other with P10 pin, P11 pin and the INT1 pin of microprocessor 22 in the intelligence control circuit 2 respectively.Principle of work is: 1. data presentation function, microprocessor 22 will data presented by DAT and CLK signal wire, pass to and drive display chip BC7281, finish the control of demonstration by this chip; 2. keypress function, when key was pressed, chip BC7281 produced a look-at-me, passed to microprocessor by the KEY signal wire, and microprocessor is again by DAT and CLK signal wire, and (different buttons has different codings, to show difference to read keyboard-coding.Coding schedule can be searched in the technical manual of BC7281).Thus, microprocessor just knows which key presses, and finishes different tasks then, as the discharge beginning, checks certain batteries voltage or the like.

The utility model is by to discharge current integral and calculating discharge electricity amount in time, in order to obtain discharge current accurately, to improve the discharge electricity amount precision, taked following measure: on the hardware, in sample circuit 1, add isolated amplifier 12 and second-order filter circuit 13, greatly reduced system interference; On the software, the current value (sampled voltage by current sampling resistor converts) that sampling is obtained carries out per ten groupings, removes two maximal values and two minimum value, more remaining six values is averaged.Current spikes and spike have been implemented good software filtration.

For the automatic record of discharge time, made full use of the Timer and the external interrupt function of microprocessor, do not need artificial intervention: during the discharge beginning, by button, Timer is opened; When discharge finishes, provide look-at-me by single-unit lithium electric protection chip, Timer is closed.Write down discharge time with this.

Claims

1, a kind of electrokinetic cell analyser is characterized in that comprising:

2, electrokinetic cell analyser according to claim 1 is characterized in that: comprise photoelectric switch in the described sampling channel, described microprocessor is controlled the open/close state of photoelectric switch by the control gating circuit.

3, electrokinetic cell analyser according to claim 1, it is characterized in that: load is connected on the two ends of the series arm of electrokinetic cell to be analyzed and sampling resistor formation, and corresponding with the sampling channel respectively sampling terminal in the two ends of every batteries and the two ends of sampling resistor links to each other.

4, electrokinetic cell analyser according to claim 1 is characterized in that: described filtering circuit is the secondary filtering circuit, is made up of operational amplifier U61A and peripheral circuit thereof.

5, electrokinetic cell analyser according to claim 1 is characterized in that: the built-in A/D converter of described microprocessor.

6, electrokinetic cell analyser according to claim 1 is characterized in that: also comprise A/D converter, be connected between filtering circuit and the microprocessor.