CN215956066U - Lithium battery charging equalization circuit - Google Patents
Lithium battery charging equalization circuit Download PDFInfo
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- CN215956066U CN215956066U CN202121849999.9U CN202121849999U CN215956066U CN 215956066 U CN215956066 U CN 215956066U CN 202121849999 U CN202121849999 U CN 202121849999U CN 215956066 U CN215956066 U CN 215956066U
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Abstract
The utility model discloses a lithium battery charging equalization circuit which comprises a plurality of lithium batteries which are connected in series, wherein each lithium battery is connected with an equalization module in parallel, and the equalization module is connected with the positive electrodes of the lithium batteries through a current identification module. The utility model has the beneficial effects that: whether the battery pack is in a charging state or not is identified through the current identification module, and if the battery pack is in the charging state, the battery pack is connected with the equalization module to enable the battery pack to be charged and equalized. If the battery pack is not in a charging state, the balancing module is disconnected, so that the electricity consumption caused by the connection of the balancing module is avoided, and the self-electricity consumption is overlarge when the battery pack is not charged.
Description
Technical Field
The utility model relates to the technical field of battery control circuits, in particular to a lithium battery charging equalization circuit.
Background
The meaning of the balance is that the electronic technology is utilized to keep the voltage deviation of the single lithium ion battery in an expected range, so that each single battery is guaranteed not to be damaged in normal use. If the balance control is not carried out, the voltage of each single battery is gradually differentiated along with the increase of the charge-discharge cycle, and the service life is greatly shortened. The existing equalizing charge circuit has larger self-consumption. When not in use, the battery power is always consumed.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a lithium battery charging equalization circuit with low self-consumption.
The utility model provides a lithium battery charging equalization circuit which comprises a plurality of lithium batteries which are connected in series, wherein each lithium battery is connected with an equalization module in parallel, and the equalization module is connected with the positive electrodes of the lithium batteries through a current identification module.
The utility model has the beneficial effects that: whether the battery pack is in a charging state or not is identified through the current identification module, and if the battery pack is in the charging state, the battery pack is connected with the equalization module to enable the battery pack to be charged and equalized. If the battery pack is not in a charging state, the balancing module is disconnected, so that the electricity consumption caused by the connection of the balancing module is avoided, and the self-electricity consumption is overlarge when the battery pack is not charged.
Further, the current identification module comprises a current transformer, an NPN triode and a first resistor;
the input end of the current transformer is connected in series with the anode of the lithium battery, the output end of the anode of the current transformer is connected with the base electrode of the NPN triode, and the collector electrode of the NPN triode is connected with the anode of the lithium battery; an emitting electrode of the NPN triode is connected with the first resistor, and the other end of the first resistor is connected with a negative electrode output end of the current transformer; and the emitter of the NPN triode is connected with the current identification module.
The beneficial effect of adopting the further scheme is that: the current transformer senses that the two lithium batteries directly pass through current, if the current is from the negative electrode of one lithium battery to the positive electrode of the other lithium battery, the lithium battery pack is charged, the current transformer outputs high level to the NPN triode, and the NPN triode is conducted to enable the balancing module to be connected.
Furthermore, a diode I is connected between the cathode output end of the current transformer and the resistor I.
The beneficial effect of adopting the further scheme is that: the first diode avoids unnecessary trouble caused by reverse output level of the current transformer in the discharging process of the lithium battery pack.
Furthermore, the equalizing module comprises a voltage comparison circuit and a second triode;
the voltage comparison circuit is provided with a positive input pin, a negative input pin and a signal output pin; the positive input pin is connected with an emitting electrode of the NPN triode, the negative input pin is connected with a negative electrode of the lithium battery, and the signal output pin is connected with a base electrode of the second triode;
and the collector and the emitter of the triode II are respectively connected with the negative electrode of the lithium battery and the emitter of the NPN triode.
The beneficial effect of adopting the further scheme is that: when the voltage comparison circuit finds that the voltage between the anode and the cathode of the lithium battery is higher than a specified value, a signal is sent to the second triode, and the collector and the emitter of the second triode are conducted, so that the charging current is directly connected to the next lithium battery without passing through the lithium battery; so that the voltage of the lithium battery is always kept to the specified value in the charging process;
further, the voltage comparison circuit comprises a TL431, a second resistor, a third resistor and a fourth resistor; the second triode is a PNP triode;
the second resistor and the third resistor are connected in series between the emitting electrode of the NPN triode and the negative electrode of the lithium battery; a reference electrode of the TL431 is connected to a lead between the second resistor and the third resistor, an anode of the TL431 is connected to a cathode of the lithium battery, and a fourth resistor is connected between a cathode of the TL431 and an emitter of the NPN triode;
the base electrode of the PNP triode is connected to the cathode of the TL431, the emitting electrode of the PNP triode is connected with the emitting electrode of the NPN triode, and the collecting electrode of the PNP triode is connected with the negative electrode of the lithium battery.
The beneficial effect of adopting the further scheme is that: the conducting voltage of the TL431 is programmed to be a designated value through the resistance ratio of the second resistor to the third resistor, and when the TL431 is conducted, the base electrode of the PNP triode receives a low level and is conducted, so that the voltage is balanced.
Furthermore, a plurality of diodes II are connected in series between the collector of the PNP triode and the negative electrode of the lithium battery.
The beneficial effect of adopting the further scheme is that: because the conduction condition of the TL431 is repeatedly and rapidly switched during working, in order to avoid safety problems caused by too low voltage at two ends of a lithium battery at a moment, a plurality of diodes II are connected in series, the sum of the starting voltages of the diodes II is more than the specified value of the conduction voltage, so that current can pass only when the sum of the starting voltages of the diodes II is reached, and the safety guarantee is further improved.
Drawings
Fig. 1 is a circuit diagram of the present invention.
Detailed Description
The present invention will be further described with reference to the following embodiments.
As shown in fig. 1, the present embodiment discloses a lithium battery charging equalization circuit, which includes a plurality of lithium batteries 3 connected in series, each of the lithium batteries 3 is connected in parallel to a balancing module, and the balancing module is connected to the positive electrode of the lithium battery 3 by a current identification module. Whether the battery pack is in a charging state or not is identified through the current identification module, and if the battery pack is in the charging state, the battery pack is connected with the equalization module to enable the battery pack to be charged and equalized. If the battery pack is not in a charging state, the balancing module is disconnected, so that the electricity consumption caused by the connection of the balancing module is avoided, and the self-electricity consumption is overlarge when the battery pack is not charged.
The current identification module comprises a current transformer 11, an NPN triode 12 and a first resistor 13; the input end of the current transformer 11 is connected in series with the anode of the lithium battery 3, the anode output end of the current transformer 11 is connected with the base of the NPN triode 12, and the collector of the NPN triode 12 is connected with the anode of the lithium battery 3; an emitting electrode of the NPN triode 12 is connected with the first resistor 13, and the other end of the first resistor 13 is connected with a negative electrode output end of the current transformer 11; the emitter of the NPN triode 12 is connected to the current identification module. The current transformer 11 senses that current directly passes through the two lithium batteries 3, if the current flows from the negative electrode of one lithium battery 3 to the positive electrode of the other lithium battery, the lithium battery pack is charged, the current transformer 11 outputs high level to the NPN triode 12, and the NPN triode 12 is conducted to enable the balancing module to be connected.
And a diode I14 is connected between the cathode output end of the current transformer 11 and the resistor I13. The first diode 14 prevents the current transformer 11 from outputting a level in the reverse direction to cause unnecessary trouble during discharging of the lithium battery pack.
The balancing module comprises a voltage comparison circuit and a second triode; the voltage comparison circuit is provided with a positive input pin, a negative input pin and a signal output pin; the positive input pin is connected with an emitting electrode of the NPN triode 12, the negative input pin is connected with a negative electrode of the lithium battery 3, and the signal output pin is connected with a base electrode of the second triode; and the collector and the emitter of the second triode are respectively connected with the cathode of the lithium battery 3 and the emitter of the NPN triode 12. When the voltage comparison circuit finds that the voltage between the anode and the cathode of the lithium battery 3 is higher than a specified value, a signal is sent to the second triode, and the collector and the emitter of the second triode are conducted, so that the charging current is directly transmitted to the next lithium battery 3 without passing through the lithium battery 3; so that the voltage of the lithium battery is always kept to the specified value in the charging process;
the voltage comparison circuit comprises TL43121, a second resistor 22, a third resistor 23 and a fourth resistor 24; the second triode is a PNP triode 25; the second resistor 22 and the third resistor 23 are connected in series between the emitter of the NPN triode 12 and the negative electrode of the lithium battery 3; the reference electrode of the TL43121 is connected to a lead between the second resistor 22 and the third resistor 23, the anode of the TL43121 is connected to the negative electrode of the lithium battery 3, and the fourth resistor 24 is connected between the cathode of the TL43121 and the emitter of the NPN triode 12; the base electrode of the PNP triode 25 is connected to the cathode of the TL43121, the emitter electrode of the PNP triode 25 is connected with the emitter electrode of the NPN triode 12, and the collector electrode of the PNP triode 25 is connected with the negative electrode of the lithium battery 3. The conducting voltage of the TL43121 is programmed to be a designated value through the resistance ratio of the second resistor 22 and the third resistor 23, and when the TL43121 is conducted, the base of the PNP triode 25 receives a low level and is further conducted, so that the voltage is balanced.
A plurality of diodes 26 are also connected in series between the collector of the PNP triode 25 and the negative electrode of the lithium battery 3. Because the conduction condition of the TL43121 is repeatedly and rapidly switched during working, in order to avoid safety problems caused by too low voltage at two ends of the lithium battery 3 at a moment, a plurality of diodes two 26 are connected in series, and the sum of the starting voltages of the diodes two 26 is more than or equal to the specified value of the conduction voltage, so that current can pass only when the sum of the starting voltages of the diodes two 26 is reached, and the safety guarantee is further improved.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent replacements, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. The lithium battery charging equalization circuit comprises a plurality of lithium batteries (3) which are connected in series, wherein each lithium battery (3) is connected with an equalization module in parallel, and the equalization circuit is characterized in that the equalization module is connected with a current identification module between positive electrodes of the lithium batteries (3).
2. The lithium battery charging equalization circuit according to claim 1, wherein the current identification module comprises a current transformer (11), an NPN transistor (12), a first resistor (13);
the input end of the current transformer (11) is connected in series with the anode of the lithium battery (3), the output end of the anode of the current transformer (11) is connected with the base electrode of the NPN triode (12), and the collector electrode of the NPN triode (12) is connected with the anode of the lithium battery (3); an emitting electrode of the NPN triode (12) is connected with the first resistor (13), and the other end of the first resistor (13) is connected with a negative electrode output end of the current transformer (11); the emitter of the NPN triode (12) is connected with the current identification module.
3. The lithium battery charging equalization circuit according to claim 2, characterized in that a diode one (14) is connected between the negative output terminal of the current transformer (11) and the resistor one (13).
4. The lithium battery charging equalization circuit of claim 2, wherein the equalization module comprises a voltage comparison circuit and a second transistor;
the voltage comparison circuit is provided with a positive input pin, a negative input pin and a signal output pin; the positive input pin is connected with an emitting electrode of the NPN triode (12), the negative input pin is connected with a negative electrode of the lithium battery (3), and the signal output pin is connected with a base electrode of the second triode;
and the collector and the emitter of the triode II are respectively connected with the negative electrode of the lithium battery (3) and the emitter of the NPN triode (12).
5. The lithium battery charging equalization circuit of claim 4, wherein the voltage comparison circuit comprises TL431(21), resistor two (22), resistor three (23), and resistor four (24); the second triode is a PNP triode (25);
the second resistor (22) and the third resistor (23) are connected in series between the emitter of the NPN triode (12) and the cathode of the lithium battery (3); the reference pole of the TL431(21) is connected to a lead between the second resistor (22) and the third resistor (23), the anode of the TL431(21) is connected with the negative pole of the lithium battery (3), and the fourth resistor (24) is connected between the cathode of the TL431(21) and the emitter of the NPN triode (12);
the base electrode of the PNP triode (25) is connected to the cathode of the TL431(21), the emitting electrode of the PNP triode (25) is connected with the emitting electrode of the NPN triode (12), and the collecting electrode of the PNP triode (25) is connected with the negative electrode of the lithium battery (3).
6. The lithium battery charging equalization circuit according to claim 5, characterized in that a plurality of diodes (26) are connected in series between the collector of the PNP transistor (25) and the cathode of the lithium battery (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121849999.9U CN215956066U (en) | 2021-08-09 | 2021-08-09 | Lithium battery charging equalization circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121849999.9U CN215956066U (en) | 2021-08-09 | 2021-08-09 | Lithium battery charging equalization circuit |
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| Publication Number | Publication Date |
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| CN215956066U true CN215956066U (en) | 2022-03-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202121849999.9U Active CN215956066U (en) | 2021-08-09 | 2021-08-09 | Lithium battery charging equalization circuit |
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| CN (1) | CN215956066U (en) |
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2021
- 2021-08-09 CN CN202121849999.9U patent/CN215956066U/en active Active
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