BMS undervoltage activation circuit control device

Abstract

The utility model provides a BMS (Battery Management System) under-voltage activation circuit control device, which comprises a BMS protection board, one end of the BMS protection board is connected with a battery pack, and the other end of the BMS protection board is connected with a charger; the under-voltage activation circuit and the BMS protection board are arranged in parallel, one end of the under-voltage activation circuit is connected with the battery pack, the other end of the under-voltage activation circuit is connected with the charger, and the under-voltage activation circuit comprises resistors R1, R2, R3, R4, R5, R6 and R7, optocouplers U1A and U1B, an MOS tube Q1 and triodes Q2 and Q3. The BMS under-voltage activation circuit control device is simple in structure, reasonable in design and convenient to operate, the energy storage power supply can be helped to be activated for reuse by arranging the under-voltage activation circuit under the condition that the battery power is completely exhausted, and the pain point that the energy storage power supply cannot be used due to the fact that the battery power of the energy storage power supply is completely exhausted can be solved.

Description

Technical Field

[0001] The utility model relates to the technical field of battery charging control, and particularly relates to a BMS undervoltage activation circuit control device. Background Art

[0002] At present, for energy storage power supplies on the market, when users do not use them for a long time (generally more than 6 months), the battery power will be completely exhausted. At this time, if users want to use them again, they cannot charge or discharge. Only professional personnel can remove the battery and directly charge the battery cells using a DC power supply or charger, otherwise this energy storage power supply cannot be used. Content of the Utility Model

[0003] Aiming at the deficiencies of the prior art, the utility model provides a BMS undervoltage activation circuit control device, which can help activate the energy storage power supply when the battery power is completely exhausted through the setting of an undervoltage activation circuit for reuse.

[0004] To achieve the above technical solution, the utility model provides a BMS undervoltage activation circuit control device, including: a BMS protection board, one end of the BMS protection board is connected to the battery pack, and the other end of the BMS protection board is connected to the charger; an undervoltage activation circuit, the undervoltage activation circuit is arranged in parallel with the BMS protection board, one end of the undervoltage activation circuit is connected to the battery pack, and the other end of the undervoltage activation circuit is connected to the charger. The undervoltage activation circuit includes: resistors R1, R2, R3, R4, R5, R6 and R7, optocouplers U1A, U1B, MOS transistor Q1, and triodes Q2 and Q3. Among them, resistors R5 and R7 are connected in series. One end of resistor R5 is connected to the positive pole BAT+ of the battery pack. One end of resistor R7 is respectively connected to the negative pole P- of the charger and the E electrodes of triodes Q2 and Q3. The B electrode of triode Q2 is connected to the connection line between resistors R5 and R7. The C electrode of triode Q2 is connected to one end of resistor R4. The other end of resistor R4 is connected to the positive pole BAT+ of the battery pack. One end of resistor R6 is connected to the connection line between the C electrode of triode Q2 and resistor R4. The other end of resistor R6 is connected to the connection line between the E electrodes of triode Q2 and Q3. The C of triode Q3 is connected to one end of optocoupler U1A. The other end of optocoupler U1A is connected to resistor R3. The other end of resistor R3 is connected to the connection line between resistor R4 and the positive pole BAT+ of the battery pack. One end of resistor R1 is connected to the negative pole P- of the charger. The other end of resistor R1 is connected to the E electrode of MOS transistor Q1. The B electrode of MOS transistor Q1 is connected to one end of optocoupler U1B. The other end of optocoupler U1B is connected to resistor R2. The other end of resistor R2 is connected to the negative pole BAT- of the battery pack. The C electrode of MOS transistor Q1 is connected to the connection line between resistor R2 and the negative pole BAT- of the battery pack.

[0005] Preferably, the resistors R3, R4, R5, R6 and R7, optocoupler U1A, transistors Q2 and Q3 form a sampling control circuit in the undervoltage activation circuit.

[0006] Preferably, the resistors R1, R2, optocoupler U1B, and MOS transistor Q1 form an activation circuit in the undervoltage activation circuit.

[0007] The beneficial effect of a BMS undervoltage activation circuit control device provided by the present utility model lies in that: the structure of this BMS undervoltage activation circuit control device is simple, reasonably designed, and convenient to operate. By setting the undervoltage activation circuit, it can help activate the energy storage power supply when the battery power is completely exhausted for reuse, and can solve the pain point that the energy storage power supply cannot be used due to completely exhausted battery power. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 It is a structural block diagram of the present utility model.

[0009] Figure 2 It is an undervoltage activation circuit diagram in the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0010] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0011] Embodiment: A BMS undervoltage activation circuit control device.

[0012] Refer to Figures 1 to 2As shown in the figure, a BMS under-voltage activation circuit control device includes: a BMS protection board, one end of the BMS protection board is connected to the battery pack, and the other end of the BMS protection board is connected to the charger; an under-voltage activation circuit, the under-voltage activation circuit is arranged in parallel with the BMS protection board, one end of the under-voltage activation circuit is connected to the battery pack, and the other end of the under-voltage activation circuit is connected to the charger. The under-voltage activation circuit includes: a sampling control circuit and an activation circuit. The sampling control circuit is composed of resistors R3, R4, R5, R6 and R7, optocoupler U1A, transistors Q2 and Q3. The resistors R5 and R7 are connected in series. One end of the resistor R5 is connected to the positive pole BAT+ of the battery pack. One end of the resistor R7 is respectively connected to the negative pole P- of the charger and the E electrodes of the transistors Q2 and Q3. The B electrode of the transistor Q2 is connected to the connection line between the resistors R5 and R7. The C electrode of the transistor Q2 is connected to one end of the resistor R4. The other end of the resistor R4 is connected to the positive pole BAT+ of the battery pack. One end of the resistor R6 is connected to the connection line between the C electrode of the transistor Q2 and the resistor R4. The other end of the resistor R6 is connected to the connection line between the E electrodes of the transistors Q2 and Q3. The C of the transistor Q3 is connected to one end of the optocoupler U1A. The other end of the optocoupler U1A is connected to the resistor R3. The other end of the resistor R3 is connected to the connection line between the resistor R4 and the positive pole BAT+ of the battery pack. The sampling control circuit is used to collect the battery voltage and provide corresponding signal control for the subsequent operation of the activation circuit. The activation circuit is composed of resistors R1, R2, optocoupler U1B and MOS transistor Q1. One end of the resistor R1 is connected to the negative pole P- of the charger. The other end of the resistor R1 is connected to the E electrode of the MOS transistor Q1. The B electrode of the MOS transistor Q1 is connected to one end of the optocoupler U1B. The other end of the optocoupler U1B is connected to the resistor R2. The other end of the resistor R2 is connected to the negative pole BAT- of the battery pack. The C electrode of the MOS transistor Q1 is connected to the connection line between the resistor R2 and the negative pole BAT- of the battery pack.

[0013] During actual operation, when the battery power is lower than the operating voltage of the BMS protection board, the BMS protection board cannot work, the battery cannot be charged or discharged. When the user needs to charge, the BMS protection board cannot work. The resistors R5 and R7 in the sampling control circuit collect the battery voltage BAT+. Since the battery voltage is lower than the preset conduction voltage of the transistor Q2, Q2 is cut off. Q3 conducts by collecting the battery voltage BAT+ through the resistors R4 and R6. The light-emitting diode inside the optocoupler U1A conducts, so that the transistor inside U1B in the activation circuit conducts. The MOS transistor Q1 conducts by sampling the voltage through the sampling resistor R2. The charger charges the battery through the resistor R1.

[0014] During the charging process, the battery voltage gradually increases. When the resistors R5 and R7 in the sampling control circuit collect that the battery voltage BAT+ is higher than the preset conduction voltage of the triode Q2, Q2 conducts, pulling down the base of Q3, so that Q3 cuts off, and the light-emitting diode inside the optocoupler U1A cuts off. As a result, the triode inside U1B in the circuit is activated to cut off, and Q1 cuts off, and the charger cannot charge the battery through R1.

[0015] The control device of the BMS undervoltage activation circuit has a simple structure, reasonable design and convenient operation. By setting the undervoltage activation circuit, it can help activate the energy storage power supply when the battery power is completely exhausted for reuse, and can solve the pain point that the energy storage power supply cannot be used due to the complete exhaustion of the battery power.

[0016] The above are the preferred embodiments of the present invention, but the present invention should not be limited to the content disclosed in this embodiment and the drawings. Therefore, all equivalent or modified implementations completed without departing from the spirit disclosed by the present invention fall within the protection scope of the present invention.

Claims

1. A BMS under-voltage activation circuit control device, characterized in that Including: A BMS protection board, one end of the BMS protection board is connected to the battery pack, and the other end of the BMS protection board is connected to the charger; An under-voltage activation circuit, the under-voltage activation circuit is arranged in parallel with the BMS protection board, one end of the under-voltage activation circuit is connected to the battery pack, and the other end of the under-voltage activation circuit is connected to the charger. The under-voltage activation circuit includes: resistors R1, R2, R3, R4, R5, R6 and R7, optocouplers U1A, U1B, MOS transistor Q1, transistors Q2 and Q3. Among them, resistors R5 and R7 are connected in series. One end of resistor R5 is connected to the positive pole BAT+ of the battery pack. One end of resistor R7 is respectively connected to the negative pole P- of the charger and the E electrodes of transistors Q2 and Q3. The B electrode of transistor Q2 is connected to the connection line between resistors R5 and R7. The C electrode of transistor Q2 is connected to one end of resistor R4. The other end of resistor R4 is connected to the positive pole BAT+ of the battery pack. One end of resistor R6 is connected to the connection line between the C electrode of transistor Q2 and resistor R4. The other end of resistor R6 is connected to the connection line between the E electrodes of transistors Q2 and Q3. The C of transistor Q3 is connected to one end of optocoupler U1A. The other end of optocoupler U1A is connected to resistor R3. The other end of resistor R3 is connected to the connection line between resistor R4 and the positive pole BAT+ of the battery pack. One end of resistor R1 is connected to the negative pole P- of the charger. The other end of resistor R1 is connected to the E electrode of MOS transistor Q1. The B electrode of MOS transistor Q1 is connected to one end of optocoupler U1B. The other end of optocoupler U1B is connected to resistor R2. The other end of resistor R2 is connected to the negative pole BAT- of the battery pack. The C electrode of MOS transistor Q1 is connected to the connection line between resistor R2 and the negative pole BAT- of the battery pack.

2. The BMS undervoltage activation circuit control device according to claim 1, wherein: The resistors R3, R4, R5, R6 and R7, optocoupler U1A, transistor Q2 and Q3 constitute the sampling control circuit in the under-voltage activation circuit.

3. The BMS under-voltage activation circuit control device according to claim 1, characterized in that: The resistors R1, R2, optocoupler U1B, MOS transistor Q1 constitute the activation circuit in the under-voltage activation circuit.

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