WO2023207455A1

WO2023207455A1 - Battery management system, battery management method and unmanned aerial vehicle

Info

Publication number: WO2023207455A1
Application number: PCT/CN2023/083610
Authority: WO
Inventors: 秦威
Original assignee: 深圳市道通智能航空技术股份有限公司
Priority date: 2022-04-28
Filing date: 2023-03-24
Publication date: 2023-11-02
Also published as: CN114709899A

Abstract

A battery management system, a battery management method, and an unmanned aerial vehicle. The battery management system comprises: a first switch circuit, a second switch circuit and an input/output port which are successively connected in series between a positive electrode and a negative electrode of a battery; a charging port connected in parallel to a branch consisting of the second switch circuit and the input/output port; and a control apparatus. In a battery standby state, if it is detected that the charging port is connected to a charging power supply while the input/output port is not connected to the charging power supply, the first switch circuit is controlled to be turned on and the second switching circuit is controlled to be turned off, so as to charge the battery and to disconnect power supplied to a power reception device. The unmanned aerial vehicle in the embodiments of the present disclosure comprises the battery management system in the embodiments of the present disclosure. In the embodiments of the present disclosure, a function of shutdown during charging can be realized while a charging effect is not influenced.

Description

A battery management system, battery management method and drone

This application requests the priority of the Chinese patent application submitted to the China Patent Office on April 28, 2022, with the application number CN 2022104706899 and the application title "A battery management system, battery management method and drone", and its entire content incorporated herein by reference.

Technical field

The present disclosure relates to, but is not limited to, battery technology, and more specifically, to a battery management system, a battery management method, and a drone.

Background technique

In some battery-powered electronic devices, the charging port and the discharging port of the battery management system are set up separately. The charging port is used to connect the charging power source to charge the battery, and the discharging port is used to connect the powered device to power the device through the battery. Charging and discharging are controlled separately in the battery management system. In this way, the charging port can only be used for charging, and the discharge port can only be used for discharging, so the compatibility is not very good. To this end, the charging port and the discharging port on the battery management system can be integrated into an input and output port, which can be connected to a charging power source to charge the battery, or connected to a powered device to provide power to the device. By detecting the input and output ports, it can be determined whether the port is connected to a charging power source or a powered device, thereby adopting different working modes. However, the above battery management system cannot meet the needs of some occasions.

Contents of the invention

The following is an overview of the topics described in detail in this article. This summary is not intended to limit the scope of the claims.

An embodiment of the present disclosure provides a battery management method, which is applied to a battery management system. The battery management system includes a first switch circuit and a second switch circuit connected in series between the positive electrode and the negative electrode of the battery. a switching circuit and an input and output port, and a charging port connected in parallel with the branch composed of the second switching circuit and the input and output port. The input and output port can be connected to a charging power source or a powered device. The method includes: when the battery is on standby state, if it is detected that the charging port is connected to the charging power supply but the input and output ports are not connected to the charging power supply, control the first switch circuit to be turned on and the second switch circuit to be turned off to charge the battery, and Disconnect power from the powered equipment.

An embodiment of the present disclosure also provides a battery management system, including:

A first switch circuit, a second switch circuit and an input and output port connected in series between the positive and negative electrodes of the battery. The input and output ports can be connected to a charging power source or a powered device;

A charging port connected in parallel with the branch circuit composed of the second switch circuit and the input and output ports;

A control device connected to the first switch circuit, the second switch circuit, the input/output port and the charging port respectively, the control device is configured to detect whether the input/output port and the charging port are connected to the charging power supply, and based on the detection result Control the on/off of the first switch circuit and the second switch circuit to cut off power supply to the powered device when charging the battery.

An embodiment of the present disclosure also provides a drone, including the battery management system as described in any embodiment of the present disclosure.

The above embodiments of the present disclosure improve the charging and discharging circuit of the battery management system. A first switch circuit, a second switch circuit and an input and output port are connected in series between the positive and negative electrodes of the battery, and the charging port is connected to the second switch circuit. Connect in parallel with the branch circuit composed of input and output ports. The control device is used to detect the charging port and the input and output ports, and then a corresponding control strategy is adopted. In the battery standby state, if it is detected that the charging port is connected to the charging power supply but the input and output ports are not connected to the charging power supply, the first switch circuit is controlled to conduct The pass and second switch circuit are disconnected to charge the battery, and the charging shutdown function can be realized without affecting the charging effect.

An embodiment of the present disclosure also provides a non-transitory computer-readable storage medium. The computer-readable storage medium stores a computer program. The feature is that when the computer program is executed by a processor, it can implement the disclosure as described in the present disclosure. The battery management method according to any embodiment.

Other aspects will be apparent after reading and understanding the drawings and detailed description.

Description of drawings

The drawings are used to provide an understanding of the embodiments of the present disclosure and constitute a part of the specification. Together with the embodiments of the present disclosure, they are used to explain the technical solutions of the present disclosure and do not constitute a limitation of the technical solutions of the present disclosure.

Figure 1 is a structural block diagram of a battery management system according to an embodiment of the present disclosure;

Figure 2 is a flow chart of a battery management method according to an embodiment of the present disclosure;

Figure 3 is a flow chart of a battery management method according to another embodiment of the present disclosure;

Figure 4 is a structural block diagram of a battery management system according to another embodiment of the present disclosure;

Figure 5 is a structural block diagram of a battery management system according to another embodiment of the present disclosure;

Figure 6 is a structural block diagram of a battery management system according to another embodiment of the present disclosure;

Figure 7 is a circuit diagram of a battery management system according to an embodiment of the present disclosure;

Figure 8 is a flow chart of a battery management method according to another embodiment of the present disclosure.

Detailed ways

The present disclosure describes multiple embodiments, but the description is illustrative rather than restrictive, and it is obvious to a person of ordinary skill in the art that within the scope of the embodiments described in the present disclosure, There are many more examples and implementations.

In the description of the present disclosure, the words "exemplary" or "such as" are used to mean an example, illustration, or explanation. Any embodiment described in this disclosure as "exemplary" or "such as" is not intended to be construed as preferred or advantageous over other embodiments. "And/or" in this article is a description of the relationship between associated objects, indicating that there can be three relationships, for example, A and/or B, which can mean: A exists alone, A and B exist simultaneously, and they exist alone. B these three situations. "Plural" means two or more than two. In addition, in order to facilitate a clear description of the technical solutions of the embodiments of the present disclosure, words such as “first” and “second” are used to distinguish the same or similar items with basically the same functions and effects. Those skilled in the art can understand that words such as "first" and "second" do not limit the number and execution order, and words such as "first" and "second" do not limit the number and execution order. In the description of this disclosure, the connections between radio frequency devices are all electrical connections, which may be direct connections or indirect connections.

In describing representative exemplary embodiments, the specification may have presented methods and/or processes as a specific sequence of steps. However, the method or process does not rely on the specificity of the steps described herein. To the extent that a sequence is specified, the method or process should not be limited to the specific sequence of steps described. As one of ordinary skill in the art will appreciate, other sequences of steps are possible. Therefore, the specific order of steps set forth in the specification should not be construed as limiting the claims. Furthermore, claims directed to the method and/or process should not be limited to steps performing them in the order written, as those skilled in the art will readily appreciate that such order may be varied and still remain within the spirit and scope of the disclosed embodiments. Inside.

The charging port and the discharging port on the battery management system are integrated into one input and output port. Connecting the charging power supply to the input and output port can charge the battery. Connecting the powered device to the input and output port can use the battery to power the powered device. However, this port setting method cannot be suitable for some special application needs. For example, in the application of automatic cruising and automatic charging of drones, the battery can be fixed on the drone. When the drone automatically returns to charging when the battery is low, the power supply to the drone (powered equipment) needs to be turned off, and the power supply can only be used through other devices. port to charge the battery. Therefore, the battery management system needs to be equipped with multiple ports for charging (the input and output ports are also a charging port), so as to realize the charging shutdown function without affecting the charging effect.

Based on this, embodiments of the present disclosure provide a battery management method, which is applied to a battery management system. As shown in Figure 1, the battery management system includes a first switch circuit 11, which is connected in series between the positive electrode and the negative electrode of the battery 2. The second switch circuit 12 and the input-output port 13 are connected in parallel with the branch circuit formed by the second switch circuit 12 and the input-output port 13 . The input/output port 13 can be used to input electric energy (that is, connect to a charging power source to charge the battery), or to output electric energy (that is, connect to a powered device and use the battery to power the powered device). The control device 15 executes the battery management method of this embodiment.

As shown in Figure 2, the battery management method of this embodiment includes:

Step 110, in the battery standby state, detect whether the charging port 14 and the input and output port 13 are connected to the charging power source;

Step 120: If it is detected that the charging port 14 is connected to the charging power source but the input/output port 13 is not connected to the charging power source, control the first switch circuit 11 to be turned on and the second switch circuit 12 to be turned off to charge the battery 2 and turn it off. Power supply to powered equipment.

Referring to Figure 1, in the standby state of battery 2, battery 2 is not charged, and battery 2 does not provide power to the powered device. The first switch circuit 11 and the second switch circuit 12 in the battery management system 1 are both at in a disconnected state. The control device 15 in the battery management system 1 detects whether the charging port 14 and the input/output port 13 are connected to the charging power supply. If it is detected that the charging port 14 is connected to the charging power supply, it means that the battery 2 needs to be charged at this time. The input and output port 13 in the battery management system 1 is also a charging port, which can be connected to a charging power supply to charge the battery. If it is detected that the input and output port 13 is not connected to the charging power supply, it means that the input and output port 13 may be damaged during the subsequent charging process. When a powered device is inserted into the device, the charging and shutdown function needs to be implemented. The method of this embodiment controls the first switch circuit 11 to be turned on at this time, forming a charging loop including the battery 2, the first switch circuit 11 and the charging port 14. The charging power source connected by the charging port 14 charges the battery 2; and controls the first switch circuit 11 to be turned on. The second switch circuit 12 is disconnected, causing the connection between the battery 2, the charging port 14 and the input and output ports 13 to be disconnected. Even if the input and output ports are inserted into the powered device during the charging process, the powered device cannot receive power. Therefore, the "charging shutdown" function is implemented. In the example of a drone application, that is, when charging the battery in the drone, the power supply to the electrical equipment in the drone is turned off.

In an exemplary embodiment of the present disclosure, the battery management method further includes: in the standby state of the battery 2, if it is detected that the input and output port 13 is connected to the charging power supply, controlling the first switch circuit 11 and the second switch circuit 12 Turn on to charge battery 2. In this embodiment, in the standby state of the battery 2, if the input and output port 13 is connected to the charging power source, it means that the battery 2 needs to be charged. When the input/output port 13 is connected to the charging power source, the powered device cannot be inserted into the input/output port 13, so there is no need to disconnect the second switch circuit 12. At this time, the charging port 14 may or may not be connected to the charging power supply. If the charging port 14 is connected to a charging power source, the voltages of the two charging power sources are required to be consistent to charge the battery 2 together. If the charging port 14 is not connected to the charging power source, the charging power source connected to the input/output port 13 charges the battery 2 through the charging circuit including the battery 2 , the first switch circuit 11 , the second switch circuit 12 and the input/output port 13 .

In an exemplary embodiment of the present disclosure, the battery management method further includes: in the battery standby state, detecting whether a powered device is inserted into the input and output port 13: if a powered device is inserted, controlling the first switch circuit 11 and The second switch circuit 12 is turned on and supplies power to the powered device through the battery 2; if no powered device is inserted, it is then determined whether the charging port 14 and the input/output port 13 are connected to the charging power source. This embodiment takes into consideration that when the battery 2 is in the standby state, there may also be a situation where a powered device is inserted into the input and output port 13 , and this action indicates the need to provide power to the powered device. At this time, the input and output port 13 will not be connected to the charging power supply, and it will no longer determine whether the charging port 14 has a charging power supply inserted. When the power supply is switched to the power supply state, there is no need to shut down the power supply. Therefore, when a powered device is inserted into the input/output port 13, there is no need to control the second switch circuit 12 to be turned off.

In an example of this embodiment, controlling the second switch circuit to be turned on includes: controlling the second switch circuit to be turned on in a slow start manner with a current gradually increasing.

An embodiment of the present disclosure provides a battery management method, and proposes corresponding control strategies for various situations in the battery special state. As shown in Figure 3, the method includes:

Step 210, in battery standby state;

The control device 15 in the battery management system can record and update the current status, which can be divided into battery standby status, battery charging status, battery power supply status, etc. Among them, the battery charging state is the state in which the charging power source is the battery charging process, and the battery power supply state is the state in which the battery is supplying power to the powered device.

Step 220: Determine whether a powered device is plugged into the input/output port 13. If there is a powered device plugged in, perform step 230. If there is no powered device plugged in, perform step 240;

Step 230, control the first switch circuit 11 and the second switch circuit 12 to be turned on, and supply power to the powered device through the battery 2, and end;

Step 240, determine whether the input and output port 13 is connected to the charging power supply. If it is connected to the charging power supply, execute step 250. If it is not connected to the charging power supply, execute step 260;

Step 250, control the first switch circuit 11 and the second switch circuit 12 to be turned on to charge the battery 2. After the battery 2 is full, control the first switch circuit 11 and the second switch circuit 12 to be turned off, and return to step 210 to enter the battery standby state. ;

This step corresponds to the processing in the above-described embodiment when the input and output port 13 is detected to be connected to the charging power source in the battery standby state.

Step 260, determine whether the charging port 14 is connected to the charging power supply. If it is connected to the charging power supply, execute step 270. If it is not connected to the charging power supply, return to step 210 to enter the battery standby state;

Step 270, control the first switch circuit 11 to turn on and the second switch circuit 12 to turn off to charge the battery 2. After the battery 2 is full, control the first switch circuit 11 to turn off, and return to step 210 to enter the battery standby state.

This step corresponds to the above embodiment in the battery standby state, detecting the connection between the charging port 14 and the charging battery. The processing when the source is connected but the input/output port 13 is not connected to the charging power source is to charge the battery, and at the same time disconnect the power supply to the powered device to realize the charging shutdown function.

The execution sequence of the above steps can be adjusted. For example, you can first determine whether the charging port 14 is connected to the charging power source, and then determine whether the input and output port 13 is connected to the charging power source. Before adjusting the sequence, you can still follow the same control logic.

An embodiment of the present disclosure also provides a battery management method, and proposes a corresponding control strategy for the situation in the battery power supply state. In the battery power supply state, a powered device is inserted into the input and output port 13, and the first switch circuit 11 and the The second switch circuit 12 is turned on, and the battery 2 supplies power to the powered device. The battery management of this embodiment includes: in the battery power supply state, if it is detected that the charging port 14 is connected to the charging power supply, the second switch circuit 12 is controlled to be disconnected, and the charging power supply connected through the charging port 14 is used to charge the battery 2, and the charging port 14 is disconnected. Turn on power to the powered device.

Take the application of autonomous cruising and automatic charging drones as an example. The battery can be fixed on the drone. When the drone automatically returns to charging when the battery is low, it is in the battery power supply state. In order to charge the battery, there is no need to connect the connecting terminals of the powered device. To unplug from the input and output port of the battery management system, you only need to connect the charging power supply to the charging port. When the control device detects that the charging port is connected to the charging power supply, it controls the second switch circuit to disconnect, that is, the charging power supply can be connected through the charging port. Charging the battery also cuts off the power supply to the powered equipment on the drone, realizing the charging and shutting down function simply and conveniently.

The battery management method in the above embodiments of the present disclosure detects each port of the battery management system and adopts a corresponding control strategy to control the switch circuit, thereby realizing the charging shutdown function without affecting the charging effect.

An embodiment of the present disclosure provides a battery management system, as shown in Figure 1, including:

The first switch circuit 11, the second switch circuit 12 and the input and output ports 13 are connected in series between the positive and negative electrodes of the battery 2; the input and output ports 13 can be connected to a charging power source or a powered device;

The charging port 14 is connected in parallel with the branch composed of the second switch circuit 12 and the input and output port 13;

The control device 15 is connected to the first switch circuit 11, the second switch circuit 12, the input and output ports 13 and the charging port 14 respectively. The control device 15 is configured to detect whether the input and output ports 13 and the charging port 14 are connected to the charging power supply, and according to The detection result controls the first switch circuit 11 and the second switch circuit 11 The circuit 12 is turned off to cut off the power supply to the powered device when the battery 2 is being charged.

The battery in the figure can be a single battery, or a battery pack composed of multiple batteries connected in series or parallel (which can also be called a battery pack in the figure), and the present disclosure does not limit this.

FIG. 1 shows only a part of the battery management system 1 to illustrate how to control the switching circuit on and off based on the detection results of the ports. The battery management system 1 may also include other circuits, devices or ports, such as current, voltage, temperature sampling circuits, etc. Although only one charging port 14 is shown in the figure, the number of charging ports 14 may be two or more.

In view of the requirements of some application scenarios, this embodiment improves the circuit of the battery management system and sets up a charging port 14 in parallel with the branch circuit composed of the second switch circuit 12 and the input and output port 13, so that the first switch can be controlled by The circuit 11 is turned on and the second switch circuit 12 is turned off, thereby realizing normal charging and simultaneously cutting off the power supply to the powered device, that is, the charging shutdown function.

In an exemplary embodiment of the present disclosure, the first switch circuit 11 is connected between the positive electrode of the battery 2 and the second switch circuit 12 , and the second switch circuit 12 is connected between the first switch circuit 11 and the input and output port 13 , the second switch circuit 12 includes a slow-start switch whose current gradually increases during the conduction process. When the voltage of battery 2 is high and the capacity is large (such as the battery used in heavy-duty drones), the moment the battery starts to supply power to the powered device, the large current will impact the device. At this time, you can set the settings on the power supply circuit. The soft start switch limits the current and also protects the battery. The second switch circuit of this embodiment includes a slow-start switch. By adding a switch circuit, the functions of shutdown (i.e., disconnecting the power supply to the powered device) and current limiting are simultaneously realized. There is no need to set up an additional slow-start switch, and the equipment can be reduced. The number of switches on the switch has better results in applications with higher line space requirements (such as drones and other equipment). In an example of this embodiment, the slow-start switch includes a switch tube and a resistor-capacitor circuit connected between the control terminal and the input terminal of the switch tube. The resistor-capacitor circuit is configured to limit the control terminal and the input terminal. The voltage between the terminals suddenly changes, so that after the switch tube is controlled to be turned on, the current flowing from the input terminal to the output terminal gradually increases. The switch tube can be a MOS tube, the control terminal is the gate of the MOS tube, the input terminal and the output terminal can be the source and drain of the MOS tube, or the drain and source of the MOS tube.

In an exemplary embodiment of the present disclosure, as shown in Figure 4, the control device 15 includes a first detection circuit 152, a second detection circuit 153 and a controller 151, wherein:

The first detection circuit 152 is connected to the charging port 14 and is configured to detect whether the charging port 14 is connected to the charging power source;

The second detection circuit 153 is connected to the input and output port 13 and is configured to detect whether the input and output port 13 is connected to the charging power supply;

The controller 151 is connected to the first detection circuit 152, the second detection circuit 153, the first switch circuit 11 and the second switch circuit 12 respectively, and is configured to receive the detection results of the first detection circuit 152 and the second detection circuit 152, and execute based on The battery management method of the embodiment of the present disclosure controls whether the input/output port 13 and the charging port 14 are connected to the charging power supply.

The control strategies executed by the controller 151 include but are not limited to:

In the battery standby state, if it is detected that the charging port 14 is connected to the charging power source but the input/output port 13 is not connected to the charging power source, the first switch circuit 11 is controlled to be turned on and the second switch circuit 12 is turned off to charge the battery 2, and Disconnect power to powered equipment;

In the battery standby state, if it is detected that the input and output port 13 is connected to the charging power source, the first switch circuit 11 and the second switch circuit 12 are controlled to be turned on to charge the battery 2; and

In the battery power supply state, if it is detected that the charging port 14 is connected to the charging power source, the second switch circuit 12 is controlled to be disconnected, the battery 2 is charged with the charging power source connected through the charging port 14, and the power supply to the powered device is cut off.

In this embodiment, as shown in Figure 4, the control device 15 may also include a third detection circuit 154. The third detection circuit 154 is connected to the input and output ports 13 and the controller 151, and is configured to detect whether the input and output ports 13 are plugged into a power receiving unit. Device; the controller 151 is also configured to receive the detection result of the third detection circuit 154 and execute the battery management method of the embodiment of the present disclosure that is controlled based on whether the input and output port 13 is inserted into the powered device. The control strategy executed by the controller 151 may also include: in the battery standby state, detecting whether a powered device is inserted into the input and output port 13: if a powered device is inserted, controlling the first switch circuit 11 and the second switch circuit 12 to conduct, The battery 2 supplies power to the powered device; if no powered device is plugged in, it is then determined whether the charging port 14 and the input/output port 13 are connected to the charging power supply, and the on/off of the first switch circuit 11 and the second switch circuit 12 is controlled based on the determination result. .

In an exemplary embodiment of the present disclosure, as shown in FIG. 5 , the controller 151 includes a microprocessor 1511 and a battery management chip 1512 , wherein: the microprocessor 1511 is connected with the first detection circuit 152 and the first detection circuit 152 . The second detection circuit 153, the third detection circuit 154, the second switch circuit 12 and the battery management chip 512 are connected respectively, and the microprocessor 1511 is configured to receive detection from the first detection circuit 152, the second detection circuit 153 and the third detection circuit 154. As a result, the battery management method of the above embodiment of the present disclosure is executed; wherein, when the first switch circuit 11 is controlled to be turned on or off, a corresponding control instruction is sent to the battery management chip 1512; the battery management chip 1512 cooperates with the first switch circuit 11 and the microprocessor The microprocessor 1511 is connected and configured to send an on control signal or an off control signal to the first switch circuit 11 according to the control instructions sent by the microprocessor 1511, so as to control the first switch circuit 11 to be on or off.

Although the controller 151 of the embodiment includes a microprocessor 1511 and a battery management chip 1512, in other embodiments, in different application scenarios, the controller 151 may also include only one microprocessor. Complete the functions implemented by the microprocessor 1511 and the battery management chip 1512 in this embodiment. Or in other embodiments, the functions of the controller 151 can also be implemented by more than three functional modules.

In an exemplary embodiment of the present disclosure, the first switch circuit 11 is a hardware protection switch circuit, which disconnects the path from the battery to the powered device through a hardware protection mechanism in the event of a fault. The microprocessor 1511 can send instructions to the battery management chip 1512, and the battery management chip 1512 controls the hardware protection switch to be turned on or off.

The battery management system of the above embodiments of the present disclosure changes the charging structure, uses microprocessor control to detect charging ports respectively, and then adopts different control strategies to realize the charging shutdown function without affecting the charging effect. Especially suitable for, but not limited to, applications in products such as drones. In addition, the added second switch circuit can be fully utilized as a slow-start switch to achieve the purpose of slowly supplying power to the powered equipment, and can reduce the number of slow-start modules on the product, which is more suitable for applications such as drones that require high line space. . It is especially suitable for the application of products such as aircraft nest drones.

An embodiment of the present disclosure provides a battery management system, as shown in Figure 6 . The battery management system of this embodiment uses the hardware protection switch 11 as the first switch circuit and the slow start switch 12 as the second switch circuit. The battery managed is the battery pack 2 . The same components as those in Figure 5 will not be described in detail. The battery management system 1 of this embodiment also includes:

The regulated power supply 19 is connected between the battery pack 2 and the microprocessor 1512. The regulated power supply 19 is configured to provide power to the microprocessor 19 after stabilizing the voltage output by the battery pack 2;

The current sampling circuit 17 is connected between the battery pack 2 and the input and output port 13. The current sampling circuit 17 is configured to sample the current in the current loop and output it to the battery processing chip 1511. The current loop includes a battery pack 2, a hardware protection switch 11, a slow start switch 12, an input and output port 13 and other devices.

The temperature and voltage sampling circuit 18 is connected between the battery pack 2 and the battery processing chip 1511 . The temperature and voltage sampling circuit 18 is configured to sample the temperature and voltage of the battery pack 2 and output them to the battery processing chip 1511 . The battery processing chip 1511 can perform charge and discharge control and other processing based on the sampled current, temperature, voltage, etc.

As shown in Figure 6, the positive electrode of the battery pack 2 passes through the hardware protection switch 11, then to the slow start switch 12, then to the input and output port 13, then passes through the current sampling circuit 1, and finally reaches the negative electrode of the battery pack 2, forming the current of the battery pack 2. loop (also called battery main loop, or high current loop). The battery management chip 1512 collects the voltage and temperature of the battery pack 2 through the temperature and voltage acquisition circuit 18, and controls the hardware protection switch 11 to be turned on or off. The battery management chip 1512 communicates with the microprocessor 1511 through the communication interface. The voltage of the battery pack 2 supplies power to the microprocessor 1511 after passing through the regulated power supply 19 . The first detection circuit 152 and the second detection circuit 153 are respectively used to detect whether the charging port 14 and the input/output port 13 are connected to the charging power source, and the detection results are output to the microprocessor 1511. The microprocessor 1511 controls the soft-start switch 12 to be turned on or off through the slow-start redundant control circuit 16 . The battery circuit switch adopts positive terminal control.

As shown in the embodiment shown in FIG. 6 , the control device 15 further includes a slow-start redundant control circuit 16 provided between the controller 151 and the second switch circuit 12 (in this example, the slow-start switch 12 ). The controller 151 controls the second switch circuit to be turned on or off through the slow start redundant control circuit 26 . In an example of this embodiment, the controller 151 is connected to the slow-start redundant control circuit 16 through the first IO port and the second IO port. When the first IO port outputs a low level and the second IO port outputs a high level, the slow-start redundant control circuit 16 outputs a signal to the second switch circuit 12 to control the disconnection of the second switch circuit 12, and outputs a signal at the first IO port. When the second IO port outputs a high level or a low level, the slow-start redundant control circuit 16 outputs a signal to the second switch circuit 12 for controlling the conduction of the second switch circuit 12 . Relative to the way the controller 151 directly switches the second circuit via a signal,

An error or malfunction of the controller (such as a microprocessor) may cause the output level of individual IO ports to change. If the output of one IO port of the controller is used to control the on-off of the second switch circuit. Then you can Abnormal changes in the output level of the IO port may cause the second switch circuit to be mistakenly disconnected, causing the power supply of the powered device to be interrupted. The slow-start redundant control circuit 16 added in this embodiment receives the two control signals output by the controller 151. When the controller fails, only the signals output by the two IO ports just change to the predetermined level (i.e. When the first IO port outputs a low level and the second IO port outputs a high level). This will cause the second switch circuit to be mistakenly disconnected. This reduces the probability that the second switch circuit is mistakenly disconnected, which is beneficial to improving the stability of power supply to the powered equipment. For equipment such as drones, it is important to ensure the continuity of power supply.

An embodiment of the present disclosure provides a battery management system. Figure 7 shows a circuit diagram of the battery management system. Reference can be made to the block diagram of Figure 5 at the same time. Figure 7 does not include all components of the battery management system. It shows the structure of the circuit in the form of a schematic diagram. The pin sequence in the figure is only an example, and may be different from that shown in the figure in other examples.

BAT+ and BAT- in Figure 7 represent the positive and negative electrodes of the battery cell respectively; PACK+ and PACK- represent the positive and negative electrodes of the input and output ports respectively. CHG_IN represents the positive electrode of the charging port, and the negative electrode of the charging port can share PACK-.

The cell group in Figure 7 is the battery pack. CELL1, CELL2... represent the cells of the battery respectively. In the legend, they are connected in series. CELL1 represents the first cell, CELL2 represents the second cell, and so on. The hardware protection module in Figure 7 includes a first switch circuit composed of MOS transistors marked Q1 and Q2, a battery management chip implemented by U1, and a current sampling circuit composed of a sensor marked SENSE. The charging detection module 1 in Figure 7 is equivalent to the first detection circuit in the above embodiment. The soft-on/off slow-start model in Figure 7 includes a slow-start switch composed of MOS transistors Q3, C1, and R2, and a slow-start redundant control circuit composed of MOS transistors Q5 and Q7. The charging detection module in Figure 7 is equivalent to the second detection circuit in the above embodiment. And the third detection circuit that implements battery insertion detection is omitted.

Q1 and Q2 in Figure 7 are the MOS tubes of the main circuit of the battery in the battery management system, forming a hardware protection switch. The slow-start switch includes the MOS tube represented by Q3, and the resistor R2, capacitor C1 and diode ZD1 connected in parallel between the gate G and the source S of Q3. The resistor-capacitor circuit composed of resistor R2, capacitor C1 and diode ZD1 can limit the sudden change in voltage between the gate G and source S of Q3. After Q3 is controlled to be turned on, the current can only gradually increase with the voltage, which plays a role in buffering. The role of startup.

The first detection circuit is connected to CHG_IN and includes a MOS transistor Q4. The gate G of Q4 is connected to the voltage dividing point of the voltage dividing circuit composed of R4 and R6 (that is, between R4 and R6). One end of the voltage dividing circuit is connected to CHG_IN connection, the other end is connected to ground. The drain D of Q4 is connected to the control power supply VSYS through the resistor R1, and the source S is connected to ground. The drain D of Q4 sets the detection point Check1 and is connected to an I/O port of the microprocessor U3. When the charging port is connected to the charging power supply, CHG_IN becomes high level, Q4 is turned on, and Check1 is low level. When the charging port is not connected to the charging power supply, Q4 is disconnected (also called shutdown, cut-off), and Check1 is high level. Microprocessor U3 can determine whether the charging port is connected to the charging power supply based on the level of the I/O port connected to check1.

The second detection circuit is connected to PACK+, and its structure is similar to that of the first detection circuit, which will not be described again. The microprocessor U3 can determine whether the input/output port is connected to the charging power source through the level of the I/O terminal connected to the detection point check2 in the second detection circuit.

U1 in Figure 7 is a battery management chip that can detect the voltage of each cell, detect overcurrent and short-circuit protection, and control functions such as Q1 and Q2. U3 is the microprocessor of the battery management system. It can be used to control the slow start switch of the battery management system, internal and external communication and some function control. It is the coordination hub of the entire system. VSYS is the voltage that supplies power to microprocessor U3, generally around 3.3V. U2 is a linear regulated power supply chip that can be used to provide a stable operating voltage to the microprocessor U3.

SENSE in Figure 7 is the current detection resistor of the battery main circuit, which is mainly used to detect the charging and discharging current of the battery.

In Figure 7, the slow-start redundant control circuit includes the first MOS transistor Q7, the second MOS transistor Q5 and a voltage dividing circuit. One end of the voltage dividing circuit is grounded and the other end is connected to the control power supply. In the example shown in the figure, the voltage dividing circuit The circuit includes two resistors R8 and R9 connected between VSYS and ground; the gate G of the first MOS tube Q7 is connected to the first IO port (number 3 in the figure) of the microprocessor U3, and the source S is connected to the microprocessor U3. The second IO port (number 6 in the figure) of the processor U3 is connected, and the drain D is connected to the voltage dividing point (between R8 and R9) of the voltage dividing circuit; the gate G of the second MOS tube Q5 is connected to the voltage dividing point. Point connection, the source S is connected to the ground, and the drain D is connected to the gate G of the MOS transistor Q3 as a slow-start switch. When the first IO port outputs low level (EN_L) and the second IO port outputs high level (EN_H), the first MOS transistor Q7 is turned on and the second MOS transistor Q5 is turned off, causing the slow start switch Q3 to turn off. That is, the second switch circuit is turned off. When the first IO port outputs a high level or the second IO port outputs a low level, the first MOS tube Q7 is turned off and the second MOS tube Q5 is turned on. The MOS tube serves as the slow start switch. Q3 is turned on, thereby controlling the second switch circuit to turn on.

The other line connections are as shown in the figure and will not be repeated one by one.

This embodiment also provides a battery management method, which is applied to the battery management system shown in Figure 6. As shown in Figure 8, the battery management method includes:

Step 310, battery standby;

Step 320: Determine whether there is a powered device plugged into the input and output port. If so, proceed to step 330. If not, proceed to step 340;

Step 330: The slow-start redundant control circuit is used to control the soft-start switch to be turned on, and the battery management chip is used to control the hardware protection switch to be turned on. After the device is soft-started, the battery is used to power the powered device and enter the power supply state, ending;

Step 340: Determine whether the charging port is connected to the charging power source. If connected, execute step 360. If not, execute step 350;

Step 350, determine whether the input and output port is connected to the charging power source. If connected, execute step 370. If not connected, return to step 310;

Step 360: Determine whether the input and output port is connected to the charging power source. If connected, execute step 370. If not, execute step 380;

Step 370: The slow-start redundant control circuit is used to control the soft-start switch to be turned on, and the battery management chip is used to control the hardware protection switch to be turned on to charge the battery. After it is fully charged, the slow-start redundant control circuit is used to control the slow-start switch to be turned off. The battery management chip controls the hardware protection switch to turn off and returns to step 310;

Step 380: Use the slow-start redundant control circuit to control the soft-start switch to turn off, and use the battery management chip to control the hardware protection switch to turn on to charge the battery. After it is fully charged, the battery management chip controls the hardware protection switch to turn off, and return to step 310.

Compared with the process of the embodiment shown in Figure 3, this embodiment adjusts the sequence of determining whether the port is connected to the charging power supply, but the control logic is consistent.

In this embodiment, when the charging port and the input and output ports are connected to the charging power supply at the same time, the slow start is controlled. The soft start switch is turned on (soft switch). If the slow start switch is not controlled to be turned on, the current can only charge the battery through the body diode of the MOS tube of the slow start switch (see Figure 7), so that the charging switching device may be Damage due to temperature rise. If the charging port is connected to the charging power supply, but the input and output ports are not connected to the charging power supply, it means that the power supply to the powered device needs to be turned off during charging. Therefore, the microprocessor controls the slow-start switch to open through the slow-start redundant control circuit. Slow start can prevent the impact of large current on the device at the moment of startup, and also protects the battery. Setting up a slow-start redundant control circuit can reduce the probability that the microprocessor will control the slow-start switch to open due to abnormality, and has the effect of protecting the equipment from power loss due to abnormal microprocessor. In an example of this embodiment, the hardware protection switch and the soft start switch are both disposed at the positive terminal of the battery.

An embodiment of the present disclosure provides a non-transitory computer-readable storage medium. The computer-readable storage medium stores a computer program, wherein the computer program, when executed by a processor, can implement any implementation of the present disclosure. The battery management method described in the example.

In any one or more of the above exemplary embodiments, the described functions may be implemented in hardware, software, firmware, or any combination thereof. If implemented in software, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium and executed by a hardware-based processing unit. Computer-readable media may include computer-readable storage media that corresponds to tangible media, such as data storage media, or communication media including any medium that facilitates transfer of a computer program from one place to another, such as according to a communications protocol. In this manner, computer-readable media generally may correspond to non-transitory, tangible computer-readable storage media or communication media such as a signal or carrier wave. Data storage media may be any available media that can be accessed by one or more computers or one or more processors to retrieve instructions, code, and/or data structures for implementing the techniques described in this disclosure. A computer program product may include computer-readable media.

By way of example, and not limitation, such computer-readable storage media may include RAM, ROM, EEPROM, CD-ROM or other optical disk storage devices, magnetic disk storage devices or other magnetic storage devices, flash memory or may be used to store instructions or data. The required program code is stored in the form of a structure and can be Any other media accessed by a computer. Furthermore, any connection is also termed a computer-readable medium if, for example, a connection is sent from a website, server, or using any of the following: coaxial cable, fiber-optic cable, twisted pair, digital subscriber line (DSL), or wireless technology such as infrared, radio, and microwave or other remote source transmits instructions, then coaxial cable, fiber optic cable, twin-wire, DSL or wireless technologies such as infrared, radio and microwave are included in the definition of medium. It should be understood, however, that computer-readable storage media and data storage media do not include connections, carrier waves, signals, or other transient (transitory) media, but are directed to non-transitory tangible storage media. As used herein, disks and optical discs include compact discs (CDs), laser discs, optical discs, digital versatile discs (DVDs), floppy disks, or Blu-ray discs. Disks usually reproduce data magnetically, while optical discs use lasers to reproduce data. Regenerate data optically. Combinations of the above should also be included within the scope of computer-readable media.

Claims

A battery management method, characterized in that it is applied to a battery management system. The battery management system includes a first switch circuit, a second switch circuit and an input and output port connected in series between the positive electrode and the negative electrode of the battery, and the A charging port in parallel with a branch circuit composed of a second switch circuit and an input and output port. The input and output port can be connected to a charging power source or a powered device. The method includes: in the battery standby state, if it is detected that the charging port is connected to the charging port. When the power supply is connected but the input/output port is not connected to the charging power source, the first switch circuit is controlled to be turned on and the second switch circuit is turned off to charge the battery and cut off the power supply to the powered device.
The battery management method according to claim 1, further comprising:

In the battery standby state, if it is detected that the input and output ports are connected to the charging power supply, the first switch circuit and the second switch circuit are controlled to be turned on to charge the battery.
The battery management method according to claim 1, further comprising:

In the battery power supply state, if it is detected that the charging port is connected to the charging power supply, the second switch circuit is controlled to be disconnected, so that the charging power supply connected through the charging port is used to charge the battery, and the power supply is disconnected. Power supply to the device.
The battery management method according to claim 1 or 2, further comprising:

In the battery standby state, detect whether a powered device is plugged into the input and output ports:

If a powered device is inserted, control the first switch circuit and the second switch circuit to conduct, and supply power to the powered device through the battery;

If no powered device is inserted, it is then determined whether the charging port and the input/output port are connected to the charging power source, and the on/off of the first switch circuit and the second switch circuit is controlled based on the determination result.
The battery management method according to claim 1 or 2, further comprising:

Controlling the second switch circuit to be turned on includes: controlling the second switch circuit to be turned on in a slow start manner with gradually increasing current.
A battery management system, characterized by including:

A first switch circuit, a second switch circuit and an input and output port connected in series between the positive and negative electrodes of the battery. The input and output ports can be connected to a charging power source or a powered device;

A charging port connected in parallel with the branch circuit composed of the second switch circuit and the input and output ports;

A control device connected to the first switch circuit, the second switch circuit, the input/output port and the charging port respectively, the control device is configured to detect whether the input/output port and the charging port are connected to the charging power supply, and based on the detection result Control the on/off of the first switch circuit and the second switch circuit to cut off power supply to the powered device when charging the battery.
The battery management system as claimed in claim 6, characterized in that:

The first switch circuit is connected between the positive electrode of the battery and the second switch circuit, and the second switch circuit includes a slow start switch that gradually increases the current during the conduction process.
The battery management system as claimed in claim 7, characterized in that:

The slow-start switch includes a switch tube, and a resistor-capacitor circuit connected between the control terminal and the input terminal of the switch tube. The resistor-capacitor circuit is configured to limit the sudden change in voltage between the control terminal and the input terminal. , so that after the switch tube is controlled to be turned on, the current flowing from the input terminal to the output terminal gradually increases.
The battery management system as claimed in claim 6, characterized in that:

The control device includes a first detection circuit, a second detection circuit and a controller, wherein:

The first detection circuit is connected to the charging port and is configured to detect whether the charging port is connected to a charging power source;

The second detection circuit is connected to the input and output port, and is configured to detect whether the input and output port is connected to a charging power supply;

The controller is connected to the first detection circuit, the second detection circuit, the first switch circuit and the second switch circuit respectively, and is configured to receive the detection results of the first detection circuit and the second detection circuit, and execute the steps as described in the right The battery management method according to any one of claims 1 to 3.
The battery management system as claimed in claim 9, characterized in that:

The control device also includes a third detection circuit, the third detection circuit is connected with the controller and The input and output port connection is configured to detect whether the input and output port is plugged into a powered device;

The controller is further configured to receive the detection result of the third detection circuit and execute the battery management method as claimed in claim 4.
The battery management system as claimed in claim 9, characterized in that:

The control device also includes a slow-start redundant control circuit; the controller is connected to the slow-start redundant control circuit through a first IO port and a second IO port;

When the first IO port outputs a low level and the second IO port outputs a high level, the slow-start redundant control circuit outputs an output to the second switch circuit for controlling the second switch circuit to turn off. signal, when the first IO port outputs a high level or the second IO port outputs a low level, the slow-start redundant control circuit outputs to the second switch circuit for controlling the second switch Signal that the circuit is on.
The battery management system of claim 11, characterized in that:

The slow-start redundant control circuit includes a first MOS tube, a second MOS tube and a voltage divider circuit, wherein: one end of the voltage divider circuit is grounded, and the other end is connected to a control power supply; the gate of the first MOS tube is connected to the The first IO port is connected, the source is connected to the second IO port, and the drain is connected to the voltage dividing point of the voltage dividing circuit; the gate of the second MOS tube is connected to the voltage dividing point, and the source The pole is grounded, and the drain is connected to the second switch circuit;

When the first IO port outputs a low level and the second IO port outputs a high level, the first MOS transistor is turned on and the second MOS transistor is turned off to control the second switch circuit to be turned off; When the first IO port outputs a high level or the second IO port outputs a low level, the first MOS transistor is turned off and the second MOS transistor is turned on to control the second switch circuit to turn on.
The battery management system as claimed in claim 9, characterized in that:

The controller includes a microprocessor and a battery management chip, where:

The microprocessor is respectively connected to the first detection circuit, the second detection circuit, the third detection circuit, the second switch circuit and the battery management chip, and is configured to receive the first detection circuit, the second detection circuit and the third detection circuit. The detection results of the three detection circuits are used to execute the battery management method; wherein when the first switch circuit is controlled to be turned on or off, corresponding control instructions are sent to the battery management chip;

The battery management chip is connected to the first switch circuit and the microprocessor, and is configured to send an on control signal or an off control signal to the first switch circuit according to the control instruction to control the first switch. The circuit is connected or disconnected.
A drone, including the battery management system according to any one of claims 6 to 13.
A non-transitory computer-readable storage medium, the computer-readable storage medium stores a computer program, characterized in that, when the computer program is executed by a processor, it can implement any one of claims 1 to 5. battery management method.