CN213185564U - BMS passive equalization circuit for preventing over discharge of battery - Google Patents
BMS passive equalization circuit for preventing over discharge of battery Download PDFInfo
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- CN213185564U CN213185564U CN202022019723.XU CN202022019723U CN213185564U CN 213185564 U CN213185564 U CN 213185564U CN 202022019723 U CN202022019723 U CN 202022019723U CN 213185564 U CN213185564 U CN 213185564U
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Abstract
The utility model discloses a prevent passive equalizer circuit of BMS of battery overdischarge relates to the technical field of lithium cell, including battery BAT1, microcontroller MCU, triode Q1, balanced auxiliary control switch K1, emitting diode D1, resistance R1, R2, R3, R4, its characterized in that: battery BAT1, triode Q1, emitting diode D1, resistance R3 establish ties and constitute the return circuit that discharges, battery BAT 1's positive pole is connecting resistance R1 still, triode Q1's base connecting resistance R2, resistance R1, the same one end that balanced auxiliary control switch K1 was connected to R2, balanced auxiliary control switch K1's other end connecting resistance R4, resistance R4 connects battery BAT 1's negative pole, microcontroller MCU connects balanced auxiliary control switch K1 to control K1's on/off, the utility model discloses have the function of preventing the battery overdischarge.
Description
Technical Field
The utility model relates to a technical field of lithium cell, concretely relates to prevent passive equalizer circuit of BMS of battery overdischarge.
Background
One group of batteries may be formed by connecting a plurality of batteries with the same or similar capacities in series, but different batteries are different inevitably, and the difference can cause a short plate effect, reduce the service time of the batteries and shorten the service life of the batteries. In order to make the whole battery reach the ideal service time, the short plate effect needs to be eliminated, the concept of 'balance' is introduced to realize the purpose, the realization mode of balance is divided into active balance and passive balance, the passive balance is realized by connecting bypass resistors in parallel at the two ends of the anode and the cathode of each battery in series and assisting devices such as a control switch, and the like, the balance mode is a balance mode with lower cost and most extensive application, when the voltage difference of the batteries in series in the battery pack is overlarge, the control switch is switched on, the batteries discharge the resistors, the resistors are used for consuming the energy of the batteries with overhigh voltage, and the voltages of the batteries in series in the whole battery pack tend to be consistent. However, this method has a great disadvantage, when the components in the circuit fail or the software in the microcontroller controlling the switch fails, the battery can continuously discharge the circuit resistance, and the discharging process is uncontrollable until the battery is over-discharged, thereby generating an over-discharge fault, and the battery cannot be recharged and reused due to serious over-discharge, and the reliability is low.
SUMMERY OF THE UTILITY MODEL
Not enough to prior art, the utility model provides a prevent passive equalizer circuit of BMS of battery overdischarge has solved the problem that proposes in the above-mentioned background art.
In order to achieve the above purpose, the utility model discloses a following technical scheme realizes: a BMS passive equalization circuit for preventing over discharge of a battery comprises a battery BAT1, a microcontroller MCU, a triode Q1, an equalization auxiliary control switch K1, a light emitting diode D1, resistors R1, R1 and R1, wherein the battery BAT1, the triode Q1, the light emitting diode D1 and the resistor R1 are connected in series to form a discharge loop, the positive pole of the battery BAT1 is connected with the emitter of the triode Q1, the collector of the triode Q1 is connected with the positive pole of the light emitting diode D1, the negative pole of the light emitting diode D1 is connected with the resistor R1, the resistor R1 is connected with the negative pole of the battery BAT1, the positive pole of the battery BAT1 is further connected with the resistor R1, the base of the triode Q1 is connected with the resistor R1, the resistors R1 and R1 are connected with the same end of the equalization auxiliary control switch K1, the other end of the equalization auxiliary control switch K1 is connected with the battery BAT1, the negative pole of the microcontroller 1, and controls the on/off of K1.
Preferably, the balance auxiliary control switch K1 is a MOS transistor or a triode.
Preferably, the transistor Q1 is a PNP transistor.
The utility model provides a prevent passive equalizer circuit of BMS of battery overdischarge possesses following beneficial effect: the characteristic that the light emitting diode needs certain forward conducting voltage is utilized to realize that a discharging loop is automatically disconnected when the battery voltage is too low, when other circuit devices or software of a control switch K1 are invalid, the battery BAT1 continuously discharges the equalizing resistor R3 and the light emitting diode D1 through the equalizing switch Q1, and when the battery BAT1 voltage is low to a certain degree, the forward conduction of the light emitting diode D1 cannot be maintained, so that the discharging loop is disconnected, the purpose that the equalizing resistor R3 is automatically stopped to discharge when the battery BAT1 voltage is too low is achieved, the battery is protected, the service life of the battery is prolonged, and the reliability is high.
Drawings
Fig. 1 is a schematic diagram of the circuit structure of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments.
Referring to fig. 1, the present invention provides a technical solution: a BMS passive equalization circuit for preventing over discharge of a battery comprises a battery BAT1, a microcontroller MCU, a triode Q1, an equalization auxiliary control switch K1, a light emitting diode D1, resistors R1, R1 and R1, wherein the battery BAT1, the triode Q1, the light emitting diode D1 and the resistor R1 are connected in series to form a discharge loop, the positive pole of the battery BAT1 is connected with the emitter of the triode Q1, the collector of the triode Q1 is connected with the positive pole of the light emitting diode D1, the negative pole of the light emitting diode D1 is connected with the resistor R1, the resistor R1 is connected with the negative pole of the battery BAT1, the positive pole of the battery BAT1 is further connected with the resistor R1, the base of the triode Q1 is connected with the resistor R1, the resistors R1 and R1 are connected with the same end of the equalization auxiliary control switch K1, the other end of the equalization auxiliary control switch K1 is connected with the battery BAT1, the negative pole of the microcontroller 1, and the on/off of the K1 is controlled, the balance auxiliary control switch K1 is an MOS transistor or a triode, and the triode Q1 is a PNP triode.
The utility model discloses a light emitting diode D1 of establishing ties in triode Q1 and resistance R3's centre, utilize light emitting diode to need certain forward conduction voltage's characteristic, realize battery voltage low time automatic disconnection discharge circuit, after other circuit device or control switch K1's software became invalid, battery BAT1 passes through equalizing switch Q1 and lasts to equalizing resistance R3 and light emitting diode D1 discharge, battery BAT1 low voltage is behind the certain degree, just can't maintain light emitting diode D1 forward conduction, thereby the disconnection discharge circuit, reach battery BAT1 low voltage automatic shutdown to the purpose of equalizing resistance R3 discharge, thereby protect the battery, extension battery life, high reliability.
The above, only be the concrete implementation of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the utility model, the concept of which is equivalent to replace or change, should be covered within the protection scope of the present invention.
Claims (3)
1. The utility model provides a BMS passive equalizer circuit of battery overdischarge prevents, includes battery BAT1, microcontroller MCU, triode Q1, balanced auxiliary control switch K1, emitting diode D1, resistance R1, R2, R3, R4, its characterized in that: the battery BAT1, the triode Q1, the light emitting diode D1 and the resistor R3 are connected in series to form a discharging loop, wherein the positive electrode of the battery BAT1 is connected with the emitter of the triode Q1, the collector of the triode Q1 is connected with the positive electrode of the light emitting diode D1, the negative electrode of the light emitting diode D1 is connected with the resistor R3, the resistor R3 is connected with the negative electrode of the battery BAT1, the positive electrode of the battery BAT1 is further connected with the resistor R1, the base of the triode Q1 is connected with the resistor R2, the resistors R1 and R2 are connected with the same end of the balancing auxiliary control switch K1, the other end of the balancing auxiliary control switch K1 is connected with the resistor R4, the resistor R4 is connected with the negative electrode of the battery BAT1, and the microcontroller MCU is connected with the balancing auxiliary control switch.
2. The BMS passive equalization circuit for preventing battery overdischarge according to claim 1, characterized in that: the balance auxiliary control switch K1 is an MOS tube or a triode.
3. The BMS passive equalization circuit for preventing battery overdischarge according to claim 1, characterized in that: the triode Q1 is a PNP triode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022019723.XU CN213185564U (en) | 2020-09-16 | 2020-09-16 | BMS passive equalization circuit for preventing over discharge of battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022019723.XU CN213185564U (en) | 2020-09-16 | 2020-09-16 | BMS passive equalization circuit for preventing over discharge of battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213185564U true CN213185564U (en) | 2021-05-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202022019723.XU Active CN213185564U (en) | 2020-09-16 | 2020-09-16 | BMS passive equalization circuit for preventing over discharge of battery |
Country Status (1)
| Country | Link |
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| CN (1) | CN213185564U (en) |
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2020
- 2020-09-16 CN CN202022019723.XU patent/CN213185564U/en active Active
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