Battery cluster active equalization circuit

Abstract

The utility model relates to the technical field of power supply circuits, and specifically discloses a battery cluster active equalization circuit. The battery cluster consists of a plurality of batteries connected in series, the switches are arranged in one-to-one correspondence with the batteries, the voltage acquisition circuit, the voltage division circuit and the voltage regulation circuit are respectively connected with the positive electrode and the negative electrode of each battery, and each switch is respectively connected with the MCU processor, so that each switch is controlled by the MCU processor; when the MCU processor detects that the voltage difference between the batteries is within a preset range, each switch is in an off state, the voltage acquisition circuit acquires the voltage value of the battery and sends the voltage value to the MCU processor, and when the MCU processor detects that the voltage difference between a certain battery and other batteries exceeds a preset value, the MCU processor sends the voltage value to the switch. The MCU processor closes the switch corresponding to the battery with overhigh voltage, and the voltage at the two ends of the battery adjusts the voltage of each battery in the battery cluster in real time through the voltage adjusting circuit and the voltage dividing circuit, so that the health degree of the battery is kept.

Description

Technical Field

[0001] The utility model relates to the technical field of power supply circuits, and particularly relates to a battery cluster active equalization circuit. Background Art

[0002] Battery active equalization is to remove the energy from the battery with the highest power through a specific circuit and then inject it into the battery with the lowest power, so as to make up for each other's strengths and weaknesses. The power of the system is determined by the average value of the single cells.

[0003] In the prior art, the active equalization circuit usually divides the active battery string into several groups, and performs active equalization within the group to realize the energy flow between the single cells and the battery cluster. After the energy of the single cell with the highest power is taken out, it is used to charge the entire battery cluster, or the entire battery cluster charges the battery with the lowest power. However, this method usually uses too many energy storage elements and switches to achieve the purpose of energy exchange. The number of basic energy storage elements is greater than or equal to the number of batteries, and the number of switches is close to twice the number of batteries. The circuit operation is complex, resulting in slow voltage adjustment between the batteries and affecting the health of the batteries. Summary of the Utility Model

[0004] In order to overcome the deficiencies of the prior art, the purpose of the utility model is to provide a battery cluster active equalization circuit to improve the health of the batteries.

[0005] The technical solution adopted by the utility model is as follows:

[0006] A battery cluster active equalization circuit includes a battery cluster composed of multiple serially connected batteries, switches arranged corresponding to the batteries one by one, and a voltage acquisition circuit, a voltage division circuit and a voltage regulation circuit respectively connected to the positive and negative electrodes of each battery. Each switch is respectively connected to an MCU processor so that each switch is controlled by the MCU processor;

[0007] The voltage acquisition circuit is used to acquire the voltage value of the battery and send the voltage value to the MCU processor;

[0008] The voltage regulation circuit is used to regulate the voltage value across the battery;

[0009] The voltage division circuit is used to conduct the voltage regulation circuit.

[0010] When the MCU processor detects that the voltage difference between the batteries is within a preset range, each switch is in the off state. The voltage acquisition circuit acquires the voltage value of the battery and sends the voltage value to the MCU processor. When the MCU processor detects that the voltage difference between a certain battery and the other batteries exceeds the preset value, the MCU processor closes the switch corresponding to the battery with too high voltage. The voltage across the battery adjusts the voltage of each battery in the battery cluster in real time through the voltage regulation circuit and the voltage division circuit, so as to enable the battery cluster to charge and discharge more deeply and maintain the health of the battery.

[0011] Optionally, the voltage acquisition circuit includes a voltage acquisition resistor, and the voltage acquisition resistor is connected in series between the positive and negative electrodes of the battery to form a voltage acquisition loop.

[0012] Optionally, the voltage division circuit includes a voltage division resistor and a MOS transistor, and the voltage division resistor and the MOS transistor are connected in series between the positive and negative electrodes of the battery to form a voltage division loop.

[0013] Optionally, the voltage regulation circuit includes a first voltage regulation resistor and a second voltage regulation resistor, which are used to regulate the voltage between the 1st pin of the MOS transistor and the 3rd pin of the ground;

[0014] The first voltage regulation resistor and the second voltage regulation resistor are connected in parallel with the voltage acquisition resistor, and the first voltage regulation resistor is connected in series with the 1st pin of the second MOS transistor, and the second voltage regulation resistor is connected in series with the 3rd pin of the MOS transistor.

[0015] Optionally, the resistance value of the first voltage regulation resistor is greater than the resistance value of the second voltage regulation resistor.

[0016] Optionally, a transient suppression diode is also provided on the buck-boost circuit. One end of the transient suppression diode is provided between the first voltage regulation resistor and the 1st pin of the MOS transistor, and the other end of the transient suppression diode is provided between the second voltage regulation resistor and the 3rd pin of the MOS transistor.

[0017] Optionally, a first capacitor and a second capacitor are connected in parallel to the battery. The two ends of the first capacitor are respectively connected to the positive and negative electrodes of the battery. One end of the second capacitor is provided between the switch and the voltage acquisition resistor, and the other end of the second capacitor is provided between the switch and the second voltage regulation resistor.

[0018] The beneficial effects of the present utility model are as follows: when the MCU processor detects that the voltage difference between each battery is within the preset range, each switch is in the off state, the voltage acquisition circuit acquires the voltage value of the battery, and sends the voltage value to the MCU processor. When the MCU processor detects that the voltage difference between a certain battery and the voltages of the other batteries exceeds the preset value, the MCU processor closes the switch corresponding to the battery with too high voltage, and the voltage at both ends of this battery adjusts the voltage of each battery in the battery cluster in real time through the voltage regulation circuit and the voltage division circuit, so as to enable the battery cluster to charge and discharge more deeply and maintain the health of the battery. Description of the Drawings

[0019] Figure 1 It is a schematic diagram of the overall structure of the present utility model.

[0020] The reference numerals in the figure correspond to the names as follows: R1, voltage division resistor; R2, first voltage regulation resistor; R3, voltage acquisition resistor; R4, second voltage regulation resistor; C1, first capacitor; C2, second capacitor; Q1, MOS transistor; Z1, transient suppression diode. Detailed Embodiment

[0021] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the 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 the embodiments. Based on the embodiments of the present utility model, 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.

[0022] Please refer to Figure 1 , the present utility model provides a technical solution:

[0023] A battery cluster active balancing circuit includes a battery cluster composed of multiple serially connected batteries, switches provided corresponding to the batteries one by one, and a voltage acquisition circuit, a voltage division circuit, and a voltage regulation circuit respectively connected to the positive and negative electrodes of each battery. Each switch is respectively connected to the MCU processor, so that each switch is controlled by the MCU processor. The multiple batteries are sequentially named BAT1, BAT2... BATn, and the switches at both ends of the batteries are sequentially named S1, S2... Sn. The MCU processor controls the on / off of the switch based on the voltage.

[0024] The voltage acquisition circuit is used to obtain the voltage value of the battery and send the voltage value to the MCU processor; the voltage acquisition circuit includes a voltage acquisition resistor R3, and the voltage acquisition resistor R3 is connected in series between the positive and negative electrodes of the battery to form a voltage acquisition loop; the voltage division circuit is used to conduct the voltage regulation circuit, and the voltage division circuit includes a voltage division resistor R1 and a MOS transistor Q1, and the voltage division resistor R1 and the MOS transistor are connected in series between the positive and negative electrodes of the battery to form a voltage division loop; the voltage regulation circuit is used to adjust the voltage value across the battery; the voltage regulation circuit includes a first voltage regulation resistor R2 and a second voltage regulation resistor R4, which are used to adjust the voltage between the 1st pin and the 3rd pin of the MOS transistor Q1, and the resistance value of the first voltage regulation resistor R2 is greater than that of the second voltage regulation resistor R4.

[0025] The first voltage regulation resistor R2 and the second voltage regulation resistor R4 are connected in parallel with the voltage division resistor R1, and the first voltage regulation resistor R2 is connected in series with the 1st pin of the MOS transistor Q1, the 2nd pin of the MOS transistor Q1 is connected in series with the voltage division resistor R1, and the second voltage regulation resistor R4 is connected in series with the 3rd pin of the MOS transistor Q1.

[0026] A transient suppression diode Z1 is arranged between the first voltage regulation resistor R2 and the second voltage regulation resistor R4. One end of the transient suppression diode Z1 is arranged between the first voltage regulation resistor R2 and the 1st pin of the MOS transistor Q1, and the other end of the transient suppression diode Z1 is arranged between the second voltage regulation resistor R4 and the 3rd pin of the MOS transistor Q1.

[0027] When the MCU processor detects that the voltage difference between each battery is within the preset range, each switch is in the off state. At this time, the MCU normally detects the voltage of each battery. The voltage of the 1st pin of the MOS transistor Q1 is lower than that of the 3rd pin, and the 2nd pin and the 3rd pin of the MOS transistor Q1 are not conducting, and the voltage division resistor R1 does not consume power; when the MCU processor detects that the voltage difference between a certain battery and the other batteries exceeds the preset value, the MCU processor closes the switch corresponding to the battery with too high voltage. The voltage of the 1st pin of the MOS transistor Q1 is higher than that of the 3rd pin. At this time, the 2nd pin and the 3rd pin of the MOS transistor Q1 are conducting, and the battery, the voltage division resistor R1, and the MOS transistor Q1 form a loop, and the voltage division resistor R1 consumes the voltage of this battery higher than that of other batteries, so that the voltage of each battery in the battery cluster is kept consistent.

[0028] A first capacitor C1 and a second capacitor C2 are connected in parallel on the battery. Both ends of the first capacitor C1 are respectively connected to the positive and negative electrodes of the battery. One end of the second capacitor C2 is arranged between the switch and the voltage acquisition resistor R3, and the other end of the second capacitor C2 is arranged between the switch and the second voltage regulation resistor R4.

[0029] Finally, it should be noted that the above are only preferred examples of the present utility model and are not used to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or perform equivalent replacements on some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. An active equalization circuit for a battery cluster, characterized in that, A battery cluster including multiple serially-connected batteries, switches provided corresponding to the batteries one by one, and a voltage acquisition circuit, a voltage division circuit, and a voltage regulation circuit respectively connected to the positive and negative electrodes of each of the batteries. Each of the switches is respectively connected to an MCU processor so that each of the switches is controlled by the MCU processor; The voltage acquisition circuit is used to acquire the voltage value of the battery and send the voltage value to the MCU processor; The voltage regulation circuit is used to regulate the voltage value across the battery; The voltage division circuit is used to turn on the voltage regulation circuit.

2. The active equalization circuit for a battery cluster according to claim 1, characterized in that, The voltage acquisition circuit includes a voltage acquisition resistor R3, and the voltage acquisition resistor R3 is connected in series between the positive and negative electrodes of the battery to form a voltage acquisition loop.

3. The active equalization circuit for a battery cluster according to claim 1, characterized in that, The voltage division circuit includes a voltage division resistor R1 and a MOS transistor Q1, and the voltage division resistor R1 and the MOS transistor Q1 are connected in series in sequence between the positive and negative electrodes of the battery to form a voltage division loop.

4. The active balancing circuit for a battery cluster according to claim 3, wherein, The voltage regulation circuit includes a first voltage regulation resistor R2 and a second voltage regulation resistor R4 and is used to regulate the voltage between the 1st pin and the 3rd pin of the MOS transistor Q1; The first voltage regulation resistor R2 and the second voltage regulation resistor R4 are connected in parallel with the voltage division resistor R1, and the first voltage regulation resistor R2 is connected in series with the 1st pin of the MOS transistor Q1, and the second voltage regulation resistor R4 is connected in series with the 3rd pin of the MOS transistor Q1.

5. The active equalization circuit for a battery cluster according to claim 4, wherein The resistance value of the first voltage regulation resistor R2 is greater than the resistance value of the second voltage regulation resistor R4.

6. The active equalization circuit for a battery cluster according to claim 4, wherein, A transient suppression diode Z1 is further provided on the voltage regulation circuit. One end of the transient suppression diode Z1 is provided between the first voltage regulation resistor R2 and the 1st pin of the MOS transistor Q1, and the other end of the transient suppression diode Z1 is provided between the second voltage regulation resistor R4 and the 3rd pin of the MOS transistor Q1.

7. The active equalization circuit for a battery cluster according to claim 4, wherein A first capacitor C1 and a second capacitor C2 are connected in parallel to the battery. Two ends of the first capacitor C1 are respectively connected to the positive and negative electrodes of the battery. One end of the second capacitor C2 is provided between the switch and the voltage acquisition resistor R3, and the other end of the second capacitor C2 is provided between the switch and the second voltage regulation resistor R4.

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