Battery management combinational circuit capable of prolonging standby time

Abstract

The utility model relates to a battery management combination circuit capable of prolonging standby time, which comprises a charging protection module, a discharging protection module, a battery voltage detection module and a main control unit, the discharge protection module is connected between a load grounding end and the main control unit, the battery voltage detection module is connected between the battery pack and the main control unit, a positive electrode of the battery pack is connected with a power supply input end of the main control unit through a light touch switch, and two ends of the light touch switch are connected with a first MOS tube in parallel; the grid electrode of the first MOS tube is connected with the positive electrode of the battery pack through a resistor, so that the grid electrode of the first MOS tube is in a high level and is disconnected, the grid electrode of the first MOS tube is also grounded through a second MOS tube, and the grid electrode of the second MOS tube is connected with the main control unit. According to the utility model, the technical problem that the standby time of the battery pack is shortened because the leakage current of the transmission charging and discharging management circuit is relatively high in a standby state is solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of battery management circuits and relates to a battery management combination circuit for extending standby time. Background Art

[0002] Batteries are a common clean energy source in daily life and are widely used in vehicles, power tools and daily electric products. In order to increase the service life of the battery, the charging and discharging process of the battery is usually managed to avoid battery damage caused by overcharging or over-discharging. In conventional circuits, the battery charging management and discharge management are separate. The charging management is integrated in the charger circuit, and the discharge management circuit is integrated in the battery pack. This causes each independent circuit and chip to consume a certain amount of power in standby mode, which ultimately shortens the standby time of the battery pack. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a battery management combination circuit for extending the standby time, so as to solve the technical problem that the transmission charge and discharge management circuit has a high leakage current in the standby state, resulting in a shortened standby time of the battery pack.

[0004] In order to solve the above technical problems, the technical solution adopted by the utility model is: a battery management combination circuit for extending standby time, including a charging protection module, a discharging protection module, a battery voltage detection module and a main control unit, the charging protection module is connected in series between the positive end of the battery pack and the charging connector, the discharging protection module is connected between the load grounding terminal and the main control unit, the battery voltage detection module is connected between the battery pack and the main control unit, the positive electrode of the battery pack is connected to the power input terminal of the main control unit through a touch switch, a first MOS tube is connected in parallel at both ends of the touch switch, the gate of the first MOS tube is connected to the positive electrode of the battery pack through a resistor so that the gate of the first MOS tube is at a high level and disconnected, and the gate of the first MOS tube is also grounded through a second MOS tube, and the gate of the second MOS tube is connected to the main control unit.

[0005] As a preferred solution, the charging protection module includes a boost charging chip, the input end of the boost charging chip is connected to the charging connector, the charging connector is a Type-c interface, the output end of the boost charging chip is connected to the positive electrode of the battery pack through a third MOS tube, the gate of the third MOS tube is grounded through a fourth MOS tube, the gate of the fourth MOS tube is connected to the main control unit, when the main control unit sends a high level to the gate of the fourth MOS tube, the fourth MOS tube and the third MOS tube are turned on, and the battery pack is charged normally.

[0006] As a preferred solution, the battery voltage detection module includes a voltage detection chip, which is connected to each battery in the battery pack and detects the voltage of each battery, and an output pin of the voltage detection chip is connected in parallel to the gate of the fourth MOS tube.

[0007] As a preferred solution, the discharge protection module includes a sampling resistor connected in series to the negative electrode of the load, and the main control unit is respectively connected to both ends of the sampling resistor, detects the voltage across the sampling resistor, obtains the load working current according to the voltage across the sampling resistor, and monitors the working state of the load.

[0008] As a preferred solution, the main control unit is also connected to a thermistor, which is bonded to the battery pack.

[0009] The beneficial effect of the utility model is as follows: the utility model integrates the charging protection module, the discharging protection module and the battery voltage detection module together, controls them through a main control unit, and uses the main control unit to actively cut off the power to make the entire circuit completely enter a power-off state, thereby reducing the leakage components of the entire battery management combination circuit in the standby state, reducing the leakage current, and extending the standby time of the battery pack, thereby solving the technical problem that the transmission charge and discharge management circuit has a high leakage current in the standby state, resulting in a shortened standby time of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] The specific implementation of the utility model is further described in detail below with reference to the accompanying drawings, wherein:

[0011] Figure 1 It is the working principle diagram of the utility model;

[0012] Figure 1 In: 1. Charging protection module, 2. Discharging protection module, 3. Battery voltage detection module, 4. Main control unit, 5. Charging connector, 6. Load, 7. Battery pack, 8. Touch switch, 9. First MOS tube, 10. Second MOS tube, 11. Third MOS tube, 12. Fourth MOS tube. DETAILED DESCRIPTION

[0013] The specific implementation scheme of the utility model is described in detail below in conjunction with the accompanying drawings.

[0014] like Figure 1The battery management combination circuit for extending the standby time shown in the figure includes a charging protection module 1, a discharging protection module 2, a battery voltage detection module 3 and a main control unit 4. The charging protection module 1 is connected in series between the positive terminal of the battery pack 7 and the charging connector 5, the discharging protection module 2 is connected between the ground terminal of the load 6 and the main control unit 4, and the battery voltage detection module 3 is connected between the battery pack 7 and the main control unit 4. The positive electrode of the battery pack 7 is connected to the power input terminal of the main control unit 4 through a touch switch 8. A voltage conversion chip U4 is arranged between the touch switch 8 and the main control unit 4. The voltage conversion chip U4 converts the output voltage of the battery pack 7 into a control voltage of 5V. A first MOS tube 9 is connected in parallel at both ends of the touch switch 8. The gate of the first MOS tube 9 is connected to the positive electrode of the battery pack 7 through a resistor so that the gate of the first MOS tube 9 is at a high level and disconnected. The gate of the first MOS tube 9 is also grounded through a second MOS tube 10. The gate of the second MOS tube 10 is connected to the main control unit 4. The main control unit 4 in this embodiment is a single-chip microcomputer. The touch switch 8 is closed to turn on the voltage conversion chip U4, thereby powering the main control unit 4. The main control unit 4 outputs a high level to the gate of the second MOS tube 10 to turn on the second MOS tube 10. The second MOS tube 10 turns on and pulls down the gate voltage of the first MOS tube 9, thereby turning on the first MOS tube 9. After the first MOS tube 9 is turned on, it can short-circuit the clear switch 8, so that the entire circuit is in a powered state, and the main control unit 4 can control the load 6 to work. The working process of the load 6 and the discharge process of the battery pack 7.

[0015] In this embodiment, the charging protection module 1 includes a boost charging chip U1, the input end of the boost charging chip U1 is connected to the charging connector 5, the charging connector 5 is a Type-c interface, and the output end of the boost charging chip U1 is connected to the positive electrode of the battery pack 7 through a third MOS tube 11, and the gate of the third MOS tube 11 is grounded through a fourth MOS tube 12, and the gate of the fourth MOS tube 12 is connected to the main control unit 4. When the main control unit 4 sends a high level to the gate of the fourth MOS tube 12, the fourth MOS tube 12 and the third MOS tube 11 are turned on, and the battery pack 7 is charged normally.

[0016] After the charging connector 5 is connected to the charger, the boost charging chip U1 is powered, and the boost charging chip U1 sends a signal to the main control unit 4. The main control unit 4 controls the fourth MOS tube 12 to be turned on according to the signal, and then turns on the third MOS tube 11 to charge the battery pack 7.

[0017] The battery voltage detection module 3 includes a voltage detection chip U2, which is connected to each battery in the battery pack 7 and detects the voltage of each battery. An output pin of the voltage detection chip U2 is connected in parallel to the gate of the fourth MOS tube 12 through the fifth MOS tube 13, and the output pin of the voltage detection chip U2 is connected to the gate of the fifth MOS tube 13. The source and drain of the fifth MOS tube are respectively connected to the gate of the fourth MOS tube 12 and ground.

[0018] During the battery charging process, the voltage detection chip U2 continuously detects the voltage of each battery in the battery pack. When it is found that the voltage of any battery exceeds the standard, the fifth MOS tube 13 can be turned on to lower the gate voltage of the fourth MOS tube 12, so that the fourth MOS tube 12 is disconnected, and then the third MOS tube 11 is cut off to stop charging, protect the battery pack, and avoid individual battery processes.

[0019] In practical applications, the main control unit 4 also detects the voltage of each battery. During the charging process, the main control unit 4 can control the opening and closing frequency of the fourth MOS tube 12 according to the detected battery voltage information, thereby controlling the charging power.

[0020] In this embodiment, the voltage detection chip U2 is also electrically connected to the main control unit 4 and sends the detected battery pack voltage information to the main control unit 4. Through double protection, the failure of the main control unit 4 can avoid problems with the battery pack 7 process.

[0021] In this embodiment, the discharge protection module 2 includes a sampling resistor R1 connected in series to the negative electrode of the load 6. The main control unit 4 is respectively connected to the two ends of the sampling resistor R1, detects the voltage across the sampling resistor, obtains the working current of the load 6 according to the voltage across the sampling resistor, and monitors the working state of the load 6.

[0022] In this embodiment, a thermistor is preferably connected to the main control unit 4, and the thermistor RT is attached to the battery pack 7. The main control unit 4 detects the operating temperature of the battery pack 7 through the thermistor RT. When the operating temperature of the battery pack is too high, the battery charging and discharging is stopped or the charging and discharging power is reduced to protect the battery pack.

[0023] The working principle of the utility model is as follows: the utility model integrates a charging protection module 1, a discharging protection module 2 and a battery voltage detection module 3, controls them through a main control unit 4, and uses the main control unit 4 to actively cut off the power so that the entire circuit is completely in a power-off state, thereby reducing the leakage components of the entire battery management combination circuit in the standby state, reducing the leakage current, and extending the standby time of the battery pack, thereby solving the technical problem that the transmission charge and discharge management circuit has a high leakage current in the standby state, resulting in a shortened standby time of the battery pack.

[0024] The above embodiments are only illustrative of the principles and effects of the invention, as well as some embodiments of its application, and are not intended to limit the invention. It should be pointed out that a person skilled in the art can make several modifications and improvements without departing from the inventive concept of the invention, and all of these belong to the protection scope of the invention.

Claims

1. A battery management combination circuit for extending standby time, characterized in that: The invention comprises a charging protection module (1), a discharging protection module (2), a battery voltage detection module (3) and a main control unit (4), wherein the charging protection module (1) is connected in series between the positive terminal of a battery pack (7) and a charging connector (5), the discharging protection module (2) is connected between the ground terminal of a load (6) and the main control unit (4), and the battery voltage detection module (3) is connected between the battery pack (7) and the main control unit (4). The positive terminal of the battery pack (7) is connected to the power input terminal of the main control unit (4) via a touch switch (8), and a first MOS tube (9) is connected in parallel at both ends of the touch switch (8). The gate of the first MOS tube (9) is connected to the positive terminal of the battery pack (7) via a resistor so that the gate of the first MOS tube (9) is at a high level and disconnected. The gate of the first MOS tube (9) is also grounded via a second MOS tube (10), and the gate of the second MOS tube (10) is connected to the main control unit (4).

2. The battery management combined circuit for extending standby time according to claim 1, characterized in that: The charging protection module (1) comprises a boost charging chip, the input end of the boost charging chip is connected to a charging connector (5), the charging connector (5) is a Type-C interface, the output end of the boost charging chip is connected to the positive electrode of the battery pack (7) via a third MOS tube (11), the gate of the third MOS tube (11) is grounded via a fourth MOS tube (12), the gate of the fourth MOS tube (12) is connected to the main control unit (4), when the main control unit (4) sends a high level to the gate of the fourth MOS tube (12), the fourth MOS tube (12) and the third MOS tube (11) are turned on, and the battery pack (7) is charged normally.

3. The battery management combined circuit for extending standby time according to claim 2, characterized in that: The battery voltage detection module (3) comprises a voltage detection chip, which is connected to each battery in the battery pack (7) and detects the voltage of each battery, and an output pin of the voltage detection chip is connected in parallel to the gate of the fourth MOS tube (12).

4. The battery management combined circuit for extending standby time according to claim 1, characterized in that: The discharge protection module (2) comprises a sampling resistor connected in series to the negative electrode of the load (6), and the main control unit (4) is respectively connected to both ends of the sampling resistor, detects the voltage across the sampling resistor, obtains the load (6) operating current based on the voltage across the sampling resistor, and monitors the working state of the load (6).

5. The battery management combined circuit for extending standby time according to claim 1, characterized in that: The main control unit (4) is also connected to a thermistor, which is bonded to the battery pack (7).

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