CN216489829U

CN216489829U - Battery management system and low-power-consumption standby starting circuit thereof

Info

Publication number: CN216489829U
Application number: CN202122900503.2U
Authority: CN
Inventors: 晋文章; 王友伟
Original assignee: Guangdong Pow Tech New Power Co ltd
Current assignee: Guangdong Pow Tech New Power Co ltd
Priority date: 2021-11-24
Filing date: 2021-11-24
Publication date: 2022-05-10
Anticipated expiration: 2031-11-24

Abstract

The utility model discloses a battery management system and a low-power consumption standby starting circuit thereof, comprising: the first end of the first switch tube is connected with the anode of the battery pack, the second end of the first switch tube is connected with the power supply output end of the battery, and the third end of the first switch tube is connected with the first end of the first resistor; the first end of the second switch tube is connected with the second end of the first resistor, the second end of the second switch tube is connected with the negative charging end of the battery pack, and the third end of the second switch tube is connected with the negative electrode of the battery pack; the first end of the third switching tube is connected with the second end of the first resistor, the second end of the third switching tube is connected with the negative electrode of the battery pack, and the third end of the third switching tube is connected with the self-locking output end of the micro control unit; the battery power supply output end is connected with the power taking interface of the micro control unit; when the micro control unit is powered on, the self-locking output end outputs high level. The battery management system and the low-power-consumption standby starting circuit thereof can reduce the standby power consumption, can realize self locking when the starting circuit is activated, and have simple structure and easy realization.

Description

Battery management system and low-power-consumption standby starting circuit thereof

Technical Field

The utility model belongs to the technical field of battery management systems, and particularly relates to a battery management system and a low-power-consumption standby starting circuit thereof.

Background

Along with the wide application of lithium BATTERY products, the functional requirement to the product is also higher and higher, especially lithium BATTERY BMS (BATTERY MANAGEMENT SYSTEM ), except traditional lithium BATTERY protection circuit, according to the functional need, BMS increases functional modules such as communication, coulometer, GPS (Global Positioning System), bluetooth, these functional modules have increased BMS's function, the standby power consumption of group BATTERY has also been increased simultaneously, the standby duration of group BATTERY has been reduced.

The standby power consumption is an important parameter of the battery pack, and the smaller the standby power consumption is, the longer the standby time of the battery pack is, so that the battery pack is favorably stored for a long time. On the contrary, if the standby power consumption of the battery pack is relatively large, the standby time of the battery pack is seriously affected. A common lithium battery BMS starting mode is started by waking up a button, the mode needs that an internal power circuit and an MCU (Micro Control Unit) of the BMS are always in a standby mode, the power circuit and the MCU always consume the electric quantity of a battery pack, and the power consumption of the BMS cannot be reduced to the lowest state.

SUMMERY OF THE UTILITY MODEL

The utility model provides a battery management system and a low-power-consumption standby starting circuit thereof, which can solve or at least partially solve the technical problems.

Therefore, the utility model adopts the following technical scheme:

in a first aspect, a low power consumption standby starting circuit is provided, which includes:

the first end of the first switch tube is connected with the anode of the battery pack, the second end of the first switch tube is connected with the power supply output end of the battery, and the third end of the first switch tube is a control end and is connected with the first end of the first resistor;

a first end of the second switch tube is connected with a second end of the first resistor, the second end of the second switch tube is connected with a negative charging end of a battery pack, and a third end of the second switch tube is a control end and is connected with a negative electrode of the battery pack;

the first end of the third switching tube is connected with the second end of the first resistor, the second end of the third switching tube is connected with the negative electrode of the battery pack, and the third end is a control end and is connected with the self-locking output end of the micro control unit; the battery power supply output end is connected with the power taking interface of the micro control unit;

when the micro control unit is powered on, the self-locking output end outputs high level.

Optionally, the method further comprises:

and one end of the starting switch is connected with the second end of the first resistor, and the other end of the starting switch is connected with the negative electrode of the battery pack.

Optionally, the start switch is a manual switch or an automatic switch that can be remotely controlled.

Optionally, the first switching tube is an MOS tube, and the second switching tube and the third switching tube are both triodes.

Optionally, a battery-powered main switch is connected between the second end of the first switch tube and the battery-powered output end.

Optionally, the first ends of the first switching tube, the second switching tube and the third switching tube are all connected in series with a diode.

In a second aspect, a battery management system is provided, comprising a micro control unit and a low power consumption standby start-up circuit as described above.

Compared with the prior art, the embodiment of the utility model has the following beneficial effects:

when the micro-control unit needs to be started, the micro-control unit can be activated when being charged by the charger, so that the micro-control unit is powered on and started. Specifically, when the standby mode is in use, the first switching tube is switched off, no voltage is output from the battery power supply output end, and the standby power consumption can be reduced to the greatest extent; when charging and activating, the cathode voltage of the battery pack is greater than the voltage of the cathode charging end, so that the second switch tube is conducted, the first switch tube is conducted, the battery power supply output end outputs voltage, the micro control unit is powered on, the self-locking output end outputs high level after the micro control unit is powered on, the third switch tube is conducted to realize self locking, the first switch tube is kept conducted through due to the self locking, and the battery power supply output end continuously outputs voltage.

The battery management system and the low-power-consumption standby starting circuit thereof provided by the embodiment of the utility model can reduce the standby power consumption, can realize self-locking when the starting circuit is activated, and have simple structure and easy realization.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

The structures, ratios, sizes, and the like shown in the present specification are only used for matching with the contents disclosed in the specification, so that those skilled in the art can understand and read the present invention, and do not limit the conditions for implementing the present invention, so that the present invention has no technical significance, and any structural modifications, changes in the ratio relationship, or adjustments of the sizes, without affecting the functions and purposes of the present invention, should still fall within the scope covered by the contents disclosed in the present invention.

Fig. 1 is a circuit diagram of a low power consumption standby starting circuit according to an embodiment of the present invention;

fig. 2 is a partial circuit diagram of a battery management system according to an embodiment of the present invention.

Detailed Description

In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the embodiments described below are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Please refer to fig. 1 and fig. 2.

The embodiment provides a low-power-consumption standby starting circuit, which can be applied to a battery management system shown in fig. 2 to reduce the standby power consumption of the battery management system and improve the standby time of the battery management system, and the starting circuit has a simple structure and is easy to implement.

Specifically, the low-power-consumption standby starting circuit comprises a first switching tube Q1, a second switching tube Q2 and a third switching tube Q3, wherein the first switching tube Q1 is used for controlling the output of a battery power supply output end SYS _ VCC, the second switching tube Q2 is used for activating the starting circuit, and the third switching tube Q3 is used for realizing self-locking.

Specifically, the first switch Q1 may be a MOS transistor or a triode, and the MOS transistor is used in this embodiment. The source electrode of the first switch tube Q1 is connected with the anode BAT + of the battery pack, the drain electrode is connected with the battery power supply output end SYS _ VCC, and the grid electrode is connected with the first end of the first resistor R2. The gate is also connected to a resistor R1.

The second switch Q2 may be a triode, the collector of which is connected to the second end of the first resistor R2, the emitter of which is connected to the negative charging terminal P-of the battery pack, and the base of which is connected to the negative BAT-of the battery pack.

The third switch Q3 may be a transistor or a MOS transistor, and the transistor is used in this embodiment. The collector of the third switching tube Q3 is connected with the second end of the first resistor R2, the emitter is connected with the negative electrode BAT-of the battery pack, and the base is connected with the self-locking output end MCU _ POWER LOCK of the micro control unit MCU; the battery power supply output end SYS _ VCC is connected with a power taking interface of the MCU; when the micro control unit MCU is powered on, the self-locking output end MCU _ POWER LOCK outputs a high level. And P + is the positive charging end of the battery pack. The battery pack includes n cells.

The working principle of the embodiment is as follows:

when the standby mode is in use, the first switch tube Q1 is switched off, the battery power supply output end SYS _ VCC has no voltage output, and the micro control unit MCU is powered off, so that the overall power consumption can be reduced;

when the computer is required to be started, the computer can be charged and activated through a charger, as shown in fig. 2, wherein a charging and discharging circuit is represented by a dotted line part in the figure; when charging, the negative BAT-voltage of the battery pack is greater than the P-voltage of the negative charging terminal, so that the second switch tube Q2 is conducted, the first switch tube Q1 is conducted, the battery POWER supply output end SYS _ VCC outputs voltage, the micro control unit MCU is powered on, a self-locking signal is output to the base of the third switch tube Q3 through the self-locking output end MCU _ POWER LOCK, the third switch tube Q3 is conducted, and the conduction state of the first switch tube Q1 can be kept in a self-locking mode.

The low-power consumption standby starting circuit provided by the embodiment can reduce the standby power consumption, can be self-locked when the starting circuit is activated, and is simple in structure and easy to realize.

In another embodiment of the present application, the low power consumption standby starting circuit further includes:

and one end of the starting Switch is connected with the second end of the first resistor R2, and the other end of the starting Switch is connected with the negative electrode BAT-of the battery pack.

Further, the start Switch is a manual Switch or an automatic Switch capable of being remotely controlled.

Therefore, the battery power supply output terminal SYS _ VCC can maintain the output voltage by manually closing the start Switch to activate the start circuit, so that the first Switch tube Q1 is turned on and the third Switch tube Q3 is turned on. The starting Switch can be closed through remote control, so that the purpose of remote starting is achieved, and the first Switch tube Q1 and the third Switch tube Q3 can be conducted in the same way.

In any of the above embodiments, a battery-powered main switch System Power LDO is connected between the second end of the first switch Q1 and the battery-powered output terminal SYS _ VCC.

In any of the above embodiments, the first ends of the first switching tube Q1, the second switching tube Q2, and the third switching tube Q3 are all connected in series with diodes, which are diodes D1, D3, and D2, respectively. The emitter of the second switching tube Q2 is also connected in series with a diode D5. Specifically, the low-power-consumption standby starting circuit further comprises resistors R3, R4, R5 and R6.

In another embodiment of the present application, a battery management system is provided, which includes a MCU and a low power consumption standby start circuit as described above, and also has the above advantages.

The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims

1. A low power consumption standby start-up circuit, comprising:

2. The low power consumption standby starting circuit according to claim 1, further comprising:

3. The low power consumption standby starting circuit according to claim 2, wherein said starting switch is a manual switch or an automatic switch capable of being remotely controlled.

4. The low power consumption standby starting circuit according to claim 1 or 2, wherein the first switching tube is a MOS tube, and the second switching tube and the third switching tube are both triodes.

5. The low power consumption standby starting circuit according to claim 1 or 2, wherein a battery-powered main switch is connected between the second end of the first switch tube and the battery-powered output end.

6. The low power consumption standby starting circuit according to claim 1 or 2, wherein the first ends of the first switch tube, the second switch tube and the third switch tube are all connected with diodes in series.

7. A battery management system comprising a micro control unit and a low power standby start-up circuit according to any one of claims 1 to 6.