CN212231114U - Lithium battery pack charging device - Google Patents
Lithium battery pack charging device Download PDFInfo
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- CN212231114U CN212231114U CN202020677147.5U CN202020677147U CN212231114U CN 212231114 U CN212231114 U CN 212231114U CN 202020677147 U CN202020677147 U CN 202020677147U CN 212231114 U CN212231114 U CN 212231114U
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Abstract
The utility model provides a lithium cell group charging device belongs to the charging device field. The utility model provides a lithium battery pack charging device, because have the singlechip system, controllable constant current source, voltage limiting control circuit and voltage limiting detection circuitry, the singlechip read-in is currently by the rechargeable battery voltage value district, the rethread is timed interruption and converts the controllable constant current source circuit module to PWM output control voltage limiting control, and when the voltage is too high, voltage limiting control circuit can automatic limited maximum voltage, the electric current, third resistance among the voltage limiting control circuit need go the control resistance size through the single chip microcomputer control relay, the adjustment voltage limiting value size, thereby the adjustment, stabilize by the electric current size of rechargeable battery, so, the utility model provides a lithium battery pack charging device can charge to the lithium cell of different models, and simple structure, the preparation is convenient, low cost.
Description
Technical Field
The utility model belongs to the charging device field, concretely relates to lithium cell group charging device.
Background
As electronic products play an increasingly important role in life, batteries, which are the power sources of electronic products, come in various models. For example, batteries in campus laboratories have various types ranging from 3.7V to 11.1V, and the most numerous batteries are lithium batteries with one section of 3.7V. However, different battery chargers are required for charging different batteries, and the stacking of a large number of chargers not only occupies a large space but also makes mistakes. The battery is easily damaged by charging the lithium battery pack by using the wrong charger, so that the battery is scrapped in advance. However, the prior art does not have a charging device for charging a plurality of lithium batteries of different models at the same time.
SUMMERY OF THE UTILITY MODEL
The utility model relates to a solve above-mentioned problem and go on, aim at provides a can be for the lithium cell group charging device that multiple different model lithium cell charges.
The utility model provides a lithium cell group charging device has such characteristic, include: the controllable constant current source is provided with at least one voltage detection point and is respectively and electrically connected with the charging power supply and the lithium battery pack; the voltage limiting control circuit is electrically connected with the controllable constant current source through the voltage detection point; the singlechip system is electrically connected with the controllable constant current source and the voltage-limiting control circuit respectively; and the voltage limiting detection circuit is electrically connected with the controllable constant current source and the single chip microcomputer system respectively, wherein the voltage limiting detection circuit is used for detecting the voltage of a connecting circuit of the controllable constant current source and the lithium battery pack and sending a generated voltage feedback signal to the single chip microcomputer system, the single chip microcomputer system sends an output voltage control signal to the voltage limiting control circuit and an output current control signal to the controllable constant current source according to the voltage feedback signal, the voltage limiting control circuit controls the output maximum voltage value of the controllable constant current source according to the output voltage control signal, and the controllable constant current source controls the output current according to the output current control signal.
The utility model provides an among the lithium cell group charging device, can also have such characteristic: the controllable constant current source and the voltage-limiting control circuit form a voltage-limiting controlled controllable constant current source circuit module.
The utility model provides an among the lithium cell group charging device, can also have such characteristic: wherein, the voltage-limiting controlled controllable constant current source circuit module comprises a first triode, a second triode, a field effect tube, a second resistor, a third resistor, a fourth resistor, a voltage input end before voltage stabilization, a control port, a comparison detection port, a positive interface of the lithium battery pack and a negative interface of the lithium battery pack, a base electrode of the first triode is connected with the control port through the fourth resistor, the base electrode is electrically connected with a grid electrode of the field effect tube, an emission electrode is connected with the negative interface of the lithium battery pack, a collector electrode of the second triode is connected with the voltage input end before voltage stabilization through the second resistor, the base electrode is connected with the positive interface of the lithium battery pack through the third resistor, the emission electrode is connected with the positive interface of the lithium battery pack, a source electrode of the field effect tube is connected with the voltage input end before voltage stabilization, a drain electrode is connected with the positive interface of the lithium battery pack through the third resistor, a grounding terminal is arranged on a, and a comparison detection port is arranged on a connecting wire of the transmitting electrode of the second triode and the positive electrode interface of the lithium battery pack.
The utility model provides an among the lithium cell group charging device, can also have such characteristic: the first triode and the second triode are both PNP type triodes.
The utility model provides an among the lithium cell group charging device, can also have such characteristic: wherein, single chip microcomputer system includes: a single chip microcomputer; one end of the first resistor is connected with an EA/VPP interface of the single chip microcomputer, and the other end of the first resistor is connected with a power supply voltage; the reset circuit is respectively connected with an XT1 interface and an XT2 interface of the single chip microcomputer; and the crystal oscillator circuit is connected with the RST interface of the singlechip.
The utility model provides an among the lithium cell group charging device, can also have such characteristic: wherein, reset circuit includes: the single-chip microcomputer comprises a first capacitor, a second capacitor and a crystal oscillator, wherein the first capacitor is connected with the second capacitor in series, the crystal oscillator is connected with the first capacitor and the second capacitor in parallel, two ends of the crystal oscillator are respectively connected with an XT1 interface and an XT2 interface of the single-chip microcomputer, and a grounding interface is arranged between the first capacitor and the second capacitor.
The utility model provides an among the lithium cell group charging device, can also have such characteristic: wherein, the crystal oscillator circuit includes: electrolytic capacitor, tenth resistance and reset button, electrolytic capacitor's positive pole and reset button are connected, and the negative pole respectively with RST interface and the tenth ohmic connection of singlechip, reset button one side is connected with electrolytic capacitor, the opposite side and the RST interface connection of tenth resistance and singlechip, tenth resistance one end is connected with reset button and electrolytic capacitor's negative pole respectively, the other end ground connection, be provided with the mains voltage interface between electrolytic capacitor and the reset button.
The utility model provides an among the lithium cell group charging device, can also have such characteristic: wherein the singlechip is an Atmel89C51 type singlechip.
The utility model provides an among the lithium cell group charging device, can also have such characteristic: the voltage limiting detection circuit comprises two identical four-voltage comparators.
The utility model provides an among the lithium cell group charging device, can also have such characteristic: wherein, the four-voltage comparator is an LM339 type four-voltage comparator.
Action and effect of the utility model
According to the utility model relates to a lithium cell group charging device, because have the singlechip system, controllable constant current source, voltage limiting control circuit and voltage limiting detection circuitry, the singlechip read-in is currently by rechargeable battery voltage value district, the rethread is timed interruption and converts the controllable constant current source circuit module to PWM output control voltage limiting control, and when the voltage is too high, voltage limiting control circuit can automatic limited maximum voltage, electric current, third resistance among the voltage limiting control circuit need go the control resistance size through single chip microcomputer control relay, the adjustment voltage limiting value size, thereby the adjustment, stabilize by rechargeable battery's electric current size, so, the utility model provides a lithium cell group charging device can charge to the lithium cell of different models, and simple structure, the preparation is convenient, low cost.
Drawings
Fig. 1 is a schematic structural diagram of a lithium battery pack charging apparatus according to an embodiment of the present invention;
fig. 2 is a circuit diagram of the single chip microcomputer system in the embodiment of the present invention;
fig. 3 is a circuit diagram of a controllable constant current source and a voltage limiting control circuit according to an embodiment of the present invention; and
fig. 4 is a hardware pin diagram of the voltage limiting detection circuit according to an embodiment of the present invention.
Detailed Description
In order to make the technical means, creation features, achievement purposes and effects of the present invention easy to understand, the present invention is specifically described below with reference to the embodiments and the accompanying drawings.
< example >
Fig. 1 is a schematic structural diagram of a lithium battery pack charging device according to an embodiment of the present invention.
As shown in fig. 1, the lithium battery pack charging device provided in this embodiment includes: a single chip microcomputer system 100 (MCU), a controllable constant current source 200, a voltage limiting control circuit 201 and a voltage limiting detection circuit 300.
Fig. 2 is a circuit diagram of the single chip microcomputer system in the embodiment of the present invention.
As shown in fig. 2, the one-chip microcomputer system 300 includes: singlechip 108, first resistance 107, reset circuit and crystal oscillator circuit.
The single chip microcomputer 108 in this embodiment is an MCU-Atmel89C51 type single chip microcomputer, and is responsible for receiving the voltage interval comparison signal transmitted from the voltage limiting detection circuit 300 and outputting a control signal to the voltage limiting control circuit 201, so as to set the charging cutoff voltage for the controllable constant current source 200, and the single chip microcomputer system 100 is also responsible for setting the magnitude of the output current for the controllable constant current source 200.
One end of the first resistor 107 is connected with an EA/VPP interface of the single chip microcomputer 108, and the other end of the first resistor is connected with a power supply voltage. In this embodiment, the resistance value of the first resistor 107 is 4.7k Ω.
The reset circuit includes: a first capacitor 101, a second point capacitor 102 and a crystal oscillator 103. The first capacitor 101 is connected in series with the second capacitor 102, the crystal oscillator 103 is connected in parallel with the first capacitor 101 and the second capacitor 102, two ends of the crystal oscillator 103 are respectively connected with an XT1 interface and an XT2 interface of the single chip 108, and a grounding interface is arranged between the first capacitor 101 and the second capacitor 102.
The crystal oscillator circuit includes: electrolytic capacitor 104, tenth resistor 105, and reset button 106. The positive pole of the electrolytic capacitor 104 is connected with the reset button 106, and the negative pole is respectively connected with the RST interface of the single chip 108 and the tenth resistor 105. The reset button 106 has one side connected to the electrolytic capacitor 104 and the other side connected to the tenth resistor 105 and the RST interface of the single chip 108. One end of the tenth resistor 105 is connected to the reset button 106 and the negative electrode of the electrolytic capacitor 104, and the other end is grounded. A power supply voltage interface is provided between the electrolytic capacitor 104 and the reset button 106. In this embodiment, the capacitance of the electrolytic capacitor 104 is 10 μ F, and the resistance of the tenth resistor 105 is 10k Ω.
Fig. 3 is a circuit diagram of the controllable constant current source and the voltage limiting control circuit according to the embodiment of the present invention.
As shown in fig. 3, in the present embodiment, the controllable constant current source 200 and the voltage-limiting control circuit 201 are designed in the same circuit module, i.e. the voltage-limiting controlled controllable constant current source circuit module. In other embodiments, the controllable constant current source 200 and the voltage limiting control circuit 201 can also be designed as two relatively independent circuit modules.
Specifically, the voltage-limiting controlled controllable constant current source circuit module includes a first triode 205, a second triode 206, a field effect transistor 207, a second resistor 202, a third resistor 203, a fourth resistor 204, a control port 208, a comparison detection port 209, a lithium battery pack positive interface 210, and a lithium battery pack negative interface 211.
The base electrode of the first triode 205 is connected with the control port 208 through the fourth resistor 204, the base electrode is electrically connected with the gate of the field effect transistor 207, and the emitting electrode is connected with the negative electrode interface 211 of the lithium battery pack. In this embodiment, the first transistor 205 is a PNP transistor.
The collector of the second triode 206 is connected with the voltage input end VIN before voltage stabilization through the second resistor 202, the base electrode is connected with the positive electrode interface 210 of the lithium battery pack through the third resistor 203, the transmitting electrode is connected with the positive electrode interface 210 of the lithium battery pack, and in this embodiment, the second triode 206 is a PNP type triode.
The source electrode of the field effect tube 207 is connected with the voltage input end VIN before voltage stabilization, the drain electrode is connected with the anode interface 210 of the lithium battery pack through the third resistor 203,
a grounding terminal GND is arranged on a connecting line of the transmitting electrode of the first triode 205 and the negative electrode interface 211 of the lithium battery pack,
a comparison detection port 209 is arranged on a connecting line between the transmitting electrode of the second triode 206 and the positive electrode interface 210 of the lithium battery pack.
The control port 208 is connected with an I/O port P3.4 (a timing interrupt T0) of the single chip microcomputer 108.
In this embodiment, the resistance values of the second resistor 202 and the tenth resistor 204 are both 10k Ω.
Fig. 4 is a hardware pin diagram of the voltage limiting detection circuit according to an embodiment of the present invention.
As shown in fig. 4, the voltage limiting detection circuit 300 is composed of two identical four-voltage comparators, and is used for comparing with a set voltage interval threshold value and feeding back to the single chip microcomputer system 100 through on-off output. In this embodiment, two LM339 type four voltage comparators are used.
One of the LM339 four- voltage comparator pins 5, 7, 9 and 11 is respectively connected with corresponding voltage reference values (3V, 4.2V, 6V and 8.4V) obtained by voltage division of a power supply and a resistor, the pins 4, 6, 8 and 10 are connected with a comparison detection port 209 of a voltage limiting control circuit, and the pins 1, 2, 3 and 4 are respectively connected with I/O ports P0.0-P0.3 of an 89C51 single chip microcomputer (108);
the other LM339 four- voltage comparator pins 5 and 7 are respectively connected with corresponding voltage reference values (9V and 12.6V) obtained by voltage division of a power supply and a resistor, the pins 4 and 6 are connected with a comparison detection port 209 of a controllable constant current source circuit module 200 controlled by voltage limiting, and the pins 1 and 2 are respectively connected with I/O ports P0.4 and P0.5 of the singlechip 108.
The main operation principle of the lithium battery pack charging device provided by the embodiment is as follows: the single chip microcomputer 108 reads in the voltage value range of the current charged battery (through the voltage limiting detection circuit 300) through the I/O port P0.0-0.5, and then converts the voltage value range into the controllable constant current source circuit module 200 controlled by PWM output control voltage limiting through the timed interruption, when the voltage is too high, the voltage limiting control circuit 201 can automatically limit the maximum voltage and current, the third resistor 203 in the voltage limiting control circuit 203 needs to control the relay through the single chip microcomputer 108 to control the resistance value, and the voltage limiting value is adjusted, so that the current of the charged battery is adjusted and stabilized.
The use method of the lithium battery pack charging device provided by the embodiment comprises the following steps: during charging, trickle charging at 0.1C (C is the total capacity of the battery) is firstly carried out for 30 minutes, then charging is carried out for 15 minutes by using current at 0.75-1C, the current voltage value range is detected from the two ends of the battery through the voltage limiting detection circuit 300 and returned to the single chip microcomputer system (100), if the current voltage value range is larger than 3V and smaller than 4.2V, the full charging voltage is 4.2V, if the current voltage value range is larger than 6V and smaller than 8.4V, the full charging voltage is 8.4V, if the current voltage value range is larger than 9V and smaller than 12.6V, the full charging voltage is 12.6V, and the like. When the voltage selection is satisfied, the MCU100 determines the charging mode and the corresponding battery pack combination information, so as to perform charging according to the corresponding charging mode (giving a control signal corresponding to the control port 208 of the voltage-limited controlled controllable constant current source circuit module 200). And then charging for half an hour at the size of 0.75-1C by using a pulse mode of switching on and off of the controllable constant current source circuit module 200 controlled by voltage limiting, finally charging for 0.5C until the voltage reaches about a calibrated voltage value, gradually reducing the current controlled by the single chip microcomputer system 100 until the calibrated voltage value is finally reached, turning off the circuit, and finishing charging.
For example, a battery pack consisting of 2 18650 batteries connected in series (1 battery with a capacity of 1500mAh) is charged, the battery is charged at a current of 0.3A for 30 minutes, then charged at a current of 2.5A for 15 minutes, the battery voltage enters a corresponding voltage interval (6V-8.4V), the charging is started at a pulsating current of 2.5A for 30 minutes (for activating the battery and slowing down the aging of the lithium battery), and finally the charging is performed at a current of 1.5A, and the battery voltage is gradually reduced to zero before the charging is finished.
Effects and effects of the embodiments
According to the lithium battery pack charging device related by the embodiment, because the lithium battery pack charging device is provided with the single chip microcomputer system, the controllable constant current source, the voltage limiting control circuit and the voltage limiting detection circuit, the single chip microcomputer reads in a voltage value range of a currently charged battery, and then the voltage value range is converted into the controllable constant current source circuit module for PWM output control voltage limiting control through timing interruption, when the voltage is too high, the voltage limiting control circuit can automatically limit the maximum voltage and the maximum current, the third resistor in the voltage limiting control circuit needs to control the resistance value through the single chip microcomputer control relay, and the voltage limiting value is adjusted, so that the current of the charged battery is adjusted and stabilized, therefore, the lithium battery pack charging device provided by the embodiment can charge lithium batteries with different models, and the lithium battery pack charging device is simple in structure, convenient to manufacture and low.
The above embodiments are preferred examples of the present invention, and are not intended to limit the scope of the present invention.
Claims (10)
1. A lithium battery pack charging device for charging lithium battery packs of a plurality of different models is characterized by comprising:
the controllable constant current source is provided with at least one voltage detection point and is respectively and electrically connected with the charging power supply and the lithium battery pack;
the voltage limiting control circuit is electrically connected with the controllable constant current source through the voltage detection point;
the single chip microcomputer system is electrically connected with the controllable constant current source and the voltage limiting control circuit respectively; and
a voltage limiting detection circuit which is respectively electrically connected with the controllable constant current source and the singlechip system,
wherein the voltage limiting detection circuit is used for detecting the voltage of a connecting circuit of the controllable constant current source and the lithium battery pack and sending a generated voltage feedback signal to the single chip microcomputer system,
the single chip microcomputer system sends an output voltage control signal to the voltage limiting control circuit according to the voltage feedback signal and sends an output current control signal to the controllable constant current source,
the voltage limiting control circuit controls the highest output voltage value of the controllable constant current source according to the output voltage control signal,
the controllable constant current source controls the output current according to the output current control signal.
2. The lithium battery pack charging device according to claim 1, wherein:
the controllable constant current source and the voltage-limiting control circuit form a voltage-limiting controlled controllable constant current source circuit module.
3. The lithium battery pack charging device according to claim 2, wherein:
wherein the voltage-limiting controlled controllable constant current source circuit module comprises a first triode, a second triode, a field effect tube, a second resistor, a third resistor, a fourth resistor, a voltage input end before voltage stabilization, a control port, a comparison detection port, a lithium battery pack positive interface and a lithium battery pack negative interface,
the base electrode of the first triode is connected with the control port through the fourth resistor, the base electrode is electrically connected with the grid electrode of the field effect tube, the emission electrode is connected with the negative electrode interface of the lithium battery pack,
the collector electrode of the second triode is connected with the voltage input end before voltage stabilization through a second resistor, the base electrode is connected with the positive electrode interface of the lithium battery pack through a third resistor, the emission electrode is connected with the positive electrode interface of the lithium battery pack,
the source electrode of the field effect tube is connected with the voltage input end before voltage stabilization, the drain electrode is connected with the positive electrode interface of the lithium battery pack through the third resistor,
a grounding end is arranged on a connecting wire of the transmitting electrode of the first triode and the negative electrode interface of the lithium battery pack,
and a comparison detection port is arranged on a connecting line of the transmitting electrode of the second triode and the positive electrode interface of the lithium battery pack.
4. The lithium battery pack charging device according to claim 3,
the first triode and the second triode are both PNP type triodes.
5. The lithium battery pack charging device according to claim 1, wherein:
wherein, single chip microcomputer system includes:
a single chip microcomputer;
one end of the first resistor is connected with an EA/VPP interface of the single chip microcomputer, and the other end of the first resistor is connected with a power supply voltage;
the reset circuit is respectively connected with an XT1 interface and an XT2 interface of the single chip microcomputer; and
and the crystal oscillator circuit is connected with the RST interface of the singlechip.
6. The lithium battery pack charging device according to claim 5, wherein:
wherein the reset circuit comprises: a first capacitor, a second capacitor and a crystal oscillator,
the first capacitor is connected with the second capacitor in series, the crystal oscillator is connected with the first capacitor and the second capacitor in parallel, two ends of the crystal oscillator are respectively connected with an XT1 interface and an XT2 interface of the single chip microcomputer, and a grounding interface is arranged between the first capacitor and the second capacitor.
7. The lithium battery pack charging device according to claim 5,
wherein, the crystal oscillator circuit includes: an electrolytic capacitor, a tenth resistor and a reset button,
the anode of the electrolytic capacitor is connected with the reset button, the cathode of the electrolytic capacitor is respectively connected with the RST interface of the singlechip and the tenth resistor,
one side of the reset button is connected with the electrolytic capacitor, the other side of the reset button is connected with the tenth resistor and the RST interface of the singlechip,
one end of the tenth resistor is respectively connected with the reset button and the cathode of the electrolytic capacitor, the other end of the tenth resistor is grounded,
and a power supply voltage interface is arranged between the electrolytic capacitor and the reset button.
8. The lithium battery pack charging device according to claim 1,
wherein the singlechip is an Atmel89C51 type singlechip.
9. The lithium battery pack charging device according to claim 1,
the voltage limiting detection circuit comprises two identical four-voltage comparators.
10. The lithium battery pack charging device according to claim 9,
wherein, the four-voltage comparator is an LM339 type four-voltage comparator.
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| CN202020677147.5U CN212231114U (en) | 2020-04-28 | 2020-04-28 | Lithium battery pack charging device |
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| CN202020677147.5U CN212231114U (en) | 2020-04-28 | 2020-04-28 | Lithium battery pack charging device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111404238A (en) * | 2020-04-28 | 2020-07-10 | 上海电力大学 | Lithium battery pack charging device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111404238A (en) * | 2020-04-28 | 2020-07-10 | 上海电力大学 | Lithium battery pack charging device |
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