CN102683763A

CN102683763A - Charging method

Info

Publication number: CN102683763A
Application number: CN2012101417944A
Authority: CN
Inventors: 宋万生; 王向宁
Original assignee: SHUANGXIN ELECTRICAL APPLIANCE (ZHENGZHOU) MANUFACTURING Co Ltd
Current assignee: SHUANGXIN ELECTRICAL APPLIANCE (ZHENGZHOU) MANUFACTURING Co Ltd
Priority date: 2012-05-09
Filing date: 2012-05-09
Publication date: 2012-09-19
Anticipated expiration: 2032-05-09
Also published as: CN102683763B

Abstract

The invention relates to a charging method. The charging method comprises the following steps: firstly, pre-charging a battery, wherein the pre-charging time is t; then detecting the voltage of the battery; and finally selecting the voltage gear which most approaches to the detected voltage value, outputting the charging voltage of the corresponding gear, and charging the battery. According to the invention, the problems in the prior art that the battery voltage is recognized inaccurately and overcharging is easily caused can be solved.

Description

A kind of charging method

Technical field

The present invention relates to the charging method at a kind of electric vehicle quick charge station.

Background technology

Electric motor car at present is more and more, but does not have electricity to bring very burden to people on the way, and the quick charge station that thereupon goes out has solved electric motor car and do not had electric emergent charging problem on the way, is characterized in quick charge, and 10-20 minute drivable 5-10 kilometer charges.Because battery size is different: 48V battery, 60V battery, 72V battery, can adopt a voltage to charge, but must the restriction charging interval.Perhaps adopt the identification cell voltage; The mode of charging with corresponding voltage; But battery power shortage degree is high or through long-time use, battery parameter can great changes will take place, is easy to the situation that causes identification inaccurate; If there is not reliable protective measure, the problem because of the identification error battery overcharge still can appear in battery like this.

Summary of the invention

The purpose of this invention is to provide a kind of charging method that is used for electric vehicle quick charge, inaccurate in order to solve prior art identification cell voltage, cause the problem that overcharges easily.

For realizing above-mentioned purpose, scheme of the present invention is: a kind of charging method, at first, battery is carried out precharge, and be t precharge time; Then, detect cell voltage; At last, select to export the charging voltage of corresponding gear, battery is charged near the voltage gear of above-mentioned detection magnitude of voltage.

Said and the charging interval is 10-20s.

The present invention detects the voltage of battery to be charged, selects output charging voltage gear then, make the charging voltage of output meet this detected value approaching charging voltage gear.In order to improve the accuracy of detection, before detecting cell voltage, at first battery is carried out a bit of time of precharge, cell voltage can return to normal condition basically, reduces cell voltage to greatest extent and differentiates error.The very high battery of power shortage degree for example, a bit of time of precharge, the battery floating voltage can return near normal level; And the very low battery of power shortage degree; The a bit of time of precharge (because pre-charging time is shorter), the variation of cell voltage is very little, remains at normal level.In order to raise the efficiency, increase accuracy, precharge time can not be long, can not be too short.Through repetition test, generally elect 10-20s the best as, like 15s.

Description of drawings

Fig. 1 is embodiments of the invention 1 circuit block diagrams;

Fig. 2 is the circuit block diagram of embodiment 2;

Fig. 3 is the polarity identification circuit schematic diagram;

Fig. 4 is importation, voltage-regulation unit circuit theory diagrams.

Embodiment

Below in conjunction with accompanying drawing the present invention is done further detailed explanation.

Charging method of the present invention:

At first, battery is carried out precharge, be t precharge time;

Then, detect cell voltage;

At last, select to export the charging voltage of corresponding gear, battery is charged near the voltage gear of above-mentioned detection magnitude of voltage.

Precharge time, t was generally 5-20s.As the gear that charges is divided into 48V, 60V, 72V, and detecting magnitude of voltage after the precharge is 56V, then selects the voltage gear of 60V for use, and the charging voltage of output 60V is that battery charges.

Several kinds of physical circuits that are suitable for the inventive method have below been provided.

Embodiment 1

Like Fig. 1, a kind of electric motor intelligent quick charge station comprises main circuit and control circuit, and said main circuit comprises successively: the AC rectification filter circuit and the HF switch converter unit that are used to connect AC power; Control circuit comprises single-chip microcomputer and coin-freed arrangement; The single-chip microcomputer input sample connects a voltage detecting circuit that is used to gather cell voltage; The single-chip microcomputer input is connected with the manual voltage-regulation button that is used to be provided with the charging voltage gear; Voltage-regulation unit of single-chip microcomputer output control connection, the output drive controlling of this voltage-regulation unit connects the switching tube of said HF switch converter unit.

The HF switch converter unit adopts the controlled direct current mode of direct current---high-frequency ac---, and charging voltage is regulated through the duty ratio of control HF switch pipe in the voltage-regulation unit.Obtain cell voltage through the voltage detecting circuit sampling; Select the gear of output voltage according to the manual voltage-regulation button of detected value; Like 36V, 60V, 72V, Single-chip Controlling voltage-regulation unit, the voltage-regulation unit is through the duty ratio of control HF switch converter unit switching tube; Control the output of HF switch converter unit, export the voltage of corresponding gear.The mode of Single-chip Controlling voltage-regulation unit is more, and embodiment 2 has provided a kind of concrete mode.

Embodiment 2

On the basis of embodiment 1, occur wrong when inferring the battery rated voltage and cause overcharging, also be provided with the protective circuit of sealing HF switch converter unit, when electric current is excessive, make the protection action.Like Fig. 2, voltage detection unit replaces with voltage and current detection circuit, when detecting charging current excessive (or other factors, as temperature etc.), cuts off the driving of HF switch converter unit through protective circuit, thereby stops charging.If when inferring battery rated voltage mistake, can select suitable charging gear through manual voltage-regulation button, charge.

In the present embodiment, the input adjustment circuit between single-chip microcomputer and the voltage-regulation unit is as shown in Figure 4, and the input of voltage-regulation unit is connected on the series connection point A of a resistance series arm; One group of output port of single-chip microcomputer connects the former limit of one group of optocoupler respectively, and the secondary of each optocoupler is all parallelly connected with a series resistance R on the said resistance series arm with a corresponding resistance (R1, R2, R3) series connection back.Single-chip microcomputer makes corresponding optocoupler conducting through the output of control output end mouth, thereby corresponding resistance (R1, R2, R3) is incorporated into respectively in the said resistance series arm, makes series connection point---and the current potential that is the voltage-regulation corresponding input end changes.The photoelectrical coupler of the corresponding corresponding gear of mage8 (single-chip microcomputer type) control, first pin (Fig. 4 A point) voltage that changes HF switch conversion control chip KA3525 makes output voltage reach corresponding value.

In the present embodiment, also increased a polarity switching, its two input connects the positive pole and the negative pole of HF switch converter unit output respectively, and its two outputs are used for connecting respectively the positive pole and the negative pole of battery.Its input anode connects the positive pole and the negative pole of its output respectively through the single-pole double throw type contact of first relay K 1, and its input cathode connects the positive pole and the negative pole of its output respectively through the single-pole double throw type contact of second relay K 2; Be equipped with the polarity discriminating circuit between its two outputs; The polarity discriminating circuit comprises two optocoupler U1, U2; The former limit of two optocouplers (and an electric capacity) is connected in reverse parallel between the output of said battery polar change-over circuit; Secondary is two triode Q1 of control connection, Q2 respectively, and two triode Q1, Q2 go here and there respectively and be located in the control coil loop of first relay K 1 and second relay K 2.

Like Fig. 3, be last negative just down as shown above if battery inserts, then optocoupler U2 is luminous, and Q1 drives relay K 1 makes normally opened contact closed, accomplishes polar switching with the dark closed contact of K2.If instead it is last just bearing down that battery inserts, then optocoupler U1 is luminous, and Q2 drives relay K 2 closed and K1 normally-closed contact completion polar switching.

Claims

1. a charging method is characterized in that, at first, battery is carried out precharge, and be t precharge time; Then, detect cell voltage; At last, select to export the charging voltage of corresponding gear, battery is charged near the voltage gear of above-mentioned detection magnitude of voltage.

2. charging method according to claim 1 is characterized in that, the said and charging interval is 10-20s.