Battery management equipment, battery pack and electric equipment

Abstract

The battery management equipment comprises a connector and a battery management system connected with the connector, the connector comprises a power supply negative electrode and a charging negative electrode, the power supply negative electrode and the charging negative electrode are the same terminal, or the power supply negative electrode and the charging negative electrode are in short circuit; the battery management system comprises a charging switch and a discharging switch, wherein the charging switch and the discharging switch are arranged on a current path from a negative electrode of a power supply to a negative electrode of a battery module; the wake-up circuit is electrically connected with the power supply cathode; the output end of the wake-up circuit, the first end of the pull-down circuit and the controller are electrically connected to the first node, and the second end of the pull-down circuit is electrically connected to the grounding end; the output end of the power circuit is electrically connected with the wake-up circuit; the battery management system is configured to control on and off of the wake-up circuit based on a voltage difference between the output end of the power supply circuit and the negative electrode of the power supply.

Description

Technical Field

[0001] This application relates to the field of electronic circuit technology, and in particular to a battery management device, a battery pack, and an electrical appliance. Background Technology

[0002] A blind-charge wake-up circuit refers to a circuit in electrical devices, including battery packs, used to detect whether a charging device is connected and automatically start the charging process. This circuit allows the battery pack to be woken up (i.e., automatically started) for charging once connected to a charging device after it has entered sleep or shutdown mode due to low battery, without requiring manual user intervention. Summary of the Invention

[0003] This application provides a battery management device, a battery pack, and an electrical device, which are applicable to various application scenarios and are highly practical.

[0004] In a first aspect, embodiments of this application provide a battery management device, including: a connector and a battery management system connected to the connector, the connector including a power supply negative terminal and a charging negative terminal, wherein the power supply negative terminal and the charging negative terminal are the same terminal, or the power supply negative terminal and the charging negative terminal are short-circuited; the battery management system includes: a charging switch and a discharging switch, the charging switch and the discharging switch being disposed on the current path from the power supply negative terminal to the battery module negative terminal; a wake-up circuit electrically connected to the power supply negative terminal; a pull-down circuit and a controller, the output terminal of the wake-up circuit, the first terminal of the pull-down circuit and the controller being electrically connected to a first node, the second terminal of the pull-down circuit being electrically connected to a ground terminal; a power supply circuit, the output terminal of the power supply circuit being electrically connected to the wake-up circuit; the battery management system is configured to: control the path and open circuit of the wake-up circuit based on the voltage difference between the output terminal of the power supply circuit and the power supply negative terminal.

[0005] Whether in a single battery pack application scenario or a parallel application scenario, the controller receives a low level before the battery pack is electrically connected to the charging device. After the battery pack is electrically connected to the charging device, the voltage at the negative terminal of the power supply decreases. The voltage difference between the output terminal of the power supply circuit and the negative terminal of the power supply controls the wake-up circuit to switch to the active state, and the controller receives a high level. Thus, the controller is woken up by the signal received by the controller switching from a low level to a high level; that is, the battery pack is woken up when the controller receives a rising edge. Therefore, the battery pack including the above-mentioned battery management device provided in this application embodiment can be used to wake up both single battery packs and parallel battery packs, making it highly practical.

[0006] In one or more embodiments, the wake-up circuit includes: an energy storage circuit, the input terminal of which is electrically connected to the output terminal of a power supply circuit; a switching circuit, the switching circuit being electrically connected to the output terminal of the energy storage circuit, the negative terminal of the power supply, and the output terminal of the power supply circuit, the output terminal of the switching circuit being the output terminal of the wake-up circuit; controlling the path and open circuit of the wake-up circuit based on the voltage difference between the output terminal of the power supply circuit and the negative terminal of the power supply includes: charging the energy storage circuit based on the change in the voltage difference between the output terminal of the power supply circuit and the negative terminal of the power supply, establishing a current path for the switching circuit to control the wake-up circuit to be in a conducting state; and disconnecting the current path for the switching circuit in response to the completion of charging of the energy storage circuit to control the wake-up circuit to be in a disconnected state.

[0007] In one or more embodiments, the energy storage circuit includes a first capacitor; a first terminal of the first capacitor is electrically connected to the output terminal of the power supply circuit, and a second terminal of the first capacitor is electrically connected to the switching circuit; wherein, the first terminal of the first capacitor is the input terminal of the energy storage circuit, and the second terminal of the first capacitor is the output terminal of the energy storage circuit.

[0008] In one or more embodiments, the wake-up circuit includes: a discharge circuit, wherein the input terminals of the discharge circuit, the energy storage circuit, and the power supply circuit are electrically connected to a second node, and the output terminal of the discharge circuit is electrically connected to the input terminal of the switching circuit; the discharge circuit is used to provide a current path for the charge discharge of the energy storage circuit.

[0009] In one or more embodiments, the discharge circuit includes a first resistor, a first switch, and a first diode; the first end of the first resistor and the third end of the first switch are electrically connected to a second node, the second end of the first resistor is electrically connected to the first end of the first switch and the cathode of the first diode, and the second end of the first switch, the output terminal of the energy storage circuit, and the anode of the first diode are electrically connected to the third node; wherein, the cathode of the first diode is the output terminal of the discharge circuit, and the first switch is an NPN transistor or an N-type FET.

[0010] In one or more embodiments, the switching circuit includes: a second switch, a third switch, a second resistor, a third resistor, a fourth resistor, and a fifth resistor; the first end of the second resistor is electrically connected to the output terminal of the energy storage circuit, or the first end of the second resistor is electrically connected to the output terminal of the energy storage circuit through a discharge circuit; the second end of the second resistor is electrically connected to the first end of the third resistor and the first end of the second switch; the second end of the third resistor and the second end of the second switch are electrically connected to the negative terminal of the power supply; the third end of the second switch is electrically connected to the first end of the fifth resistor and the first end of the third switch through the fourth resistor; the output terminal of the power supply circuit is electrically connected to the second end of the fifth resistor and the second end of the third switch; and the third end of the third switch is the output terminal of the switching circuit.

[0011] In one or more embodiments, the second switch is an NPN transistor or an N-type FET, and the third switch is a PNP transistor or a P-type FET.

[0012] In one or more embodiments, the pull-down circuit includes a sixth resistor located between the output of the wake-up circuit and the ground terminal.

[0013] In one or more embodiments, the battery management system further includes a seventh resistor and a second capacitor; the first end of the seventh resistor is electrically connected to the first node, the seventh resistor is electrically connected to the controller and the first end of the second capacitor, and the second end of the second capacitor is electrically connected to the ground terminal.

[0014] In one or more embodiments, the power supply circuit includes a voltage conversion circuit configured to be electrically connected to the battery module, to step down the voltage output by the battery module, and to supply power to the wake-up circuit.

[0015] Secondly, embodiments of this application provide a battery pack, including a battery module and a battery management device as described in the first aspect, wherein the battery module is electrically connected to the battery management system; and a power supply circuit is electrically connected to the positive terminal of the battery module.

[0016] Thirdly, embodiments of this application provide an electrical device, including a load and a battery pack as described in the second aspect. Attached Figure Description

[0017] One or more embodiments are illustrated by way of example with reference to the accompanying drawings, which are not intended to limit the embodiments, and elements having the same reference numerals in the drawings are designated as similar elements.

[0018] Figure 1 This is a schematic diagram of the battery pack provided in the embodiments of this application. Figure 1 ; Figure 2 This is a schematic diagram of the battery pack provided in the embodiments of this application. Figure 2 ; Figure 3 This is a schematic diagram of the battery management system provided in the embodiments of this application. Figure 1 ; Figure 4 This is a schematic diagram of the battery management system provided in the embodiments of this application. Figure 2 ; Figure 5 This is a schematic diagram of the battery management system provided in the embodiments of this application. Figure 3 ; Figure 6 This is a schematic diagram of the battery management system provided in the embodiments of this application. Figure 4 ; Figure 7 This is a schematic diagram of the battery management system provided in the embodiments of this application. Figure 5 ; Figure 8This is a schematic diagram of the battery management system provided in the embodiments of this application. Figure 6 ; Figure 9 This is a schematic diagram of the battery management system provided in the embodiments of this application. Figure 7 ; Figure 10 This is a schematic diagram of the battery management system provided in the embodiments of this application. Figure 8 . Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and thoroughly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0020] It should be noted that when an element is described as "connected" to another element, it can be directly connected to the other element, or there can be one or more intermediate elements between them.

[0021] Furthermore, the technical features involved in the various embodiments of this application described below can be combined with each other as long as they do not conflict with each other.

[0022] Figure 1 This is a schematic diagram of a battery pack. (Example) Figure 1 As shown, the battery pack 10000 includes a battery management device 1000 and a battery module 2000.

[0023] The battery module 2000 comprises multiple cells connected in parallel, series, or a hybrid configuration. The battery module 2000 is used to store and supply electrical energy. It is understood that a hybrid configuration includes both series and parallel connections.

[0024] The battery management device 1000 includes a connector 200, which has multiple terminals. For example... Figure 1 As shown, connector 200 is provided with a power supply negative terminal P- and a charging negative terminal C-, and Figure 1 Taking the example where the power supply negative terminal P- and the charging negative terminal C- are the same terminal, the charging negative terminal C- is the terminal electrically connected to the negative terminal of the charging device when the charging device is charging the battery pack 10000. Optionally or additionally, the power supply negative terminal P- and the charging negative terminal C- are two different terminals, such as... Figure 2 As shown, at this time, within connector 200, the power supply negative terminal P- is short-circuited with the charging negative terminal C-.

[0025] Understandably, Figure 1 and Figure 2The connector 200 shown illustrates at least some terminals. In other alternative examples, the connector 200 may be provided with additional terminals, such as indicator signal terminals and communication terminals. The indicator signal terminals are used to indicate that the connector 200 has been mated with a connector on the electrical device, and the communication terminals are used for communication between the battery pack 10000 and the electrical device. In one specific example, the connector 200 is configured as an aviation connector.

[0026] The battery management device 1000 includes a battery management system 100 connected to a connector 200. The battery management system (BMS) 100 is powered by the battery module 2000. The battery management system 100 can monitor and control the charging and / or discharging of the battery module 2000 to manage the performance of the battery module 2000 and ensure electrical safety.

[0027] The battery management system 100 includes a discharge switch S1 and a charging switch S2. The discharge switch S1 and charging switch S2 are located on the current path from the negative terminal P- of the power supply to the negative terminal B- of the battery module; that is, the discharge switch S1 and charging switch S2 are connected in series and positioned between the negative terminal B- of the battery module and the negative terminal P- of the power supply. The discharge switch S1 and / or charging switch S2 can be configured as controllable switching elements; for example, both the discharge switch S1 and charging switch S2 can be N-type FETs. It is understood that... Figure 2 Only one discharge switch S1 and one charging switch S2 are shown. If the battery pack 10000 requires a large current for charging and discharging, multiple discharge switches S1 and multiple charging switches S2 can be set to share the current. Multiple discharge switches S1 are connected in parallel, and multiple charging switches S2 are connected in parallel.

[0028] The applicant found that for a battery pack where the discharge switch S1 and the charging switch S2 are located between the negative terminal B- of the battery module and the negative power terminal P- of the battery pack, it must be suitable for at least the following two application scenarios: The first application scenario is that when a single battery pack enters sleep or shutdown mode due to low power, it can be woken up for charging without manual operation by the user when the battery pack is connected to a charging device.

[0029] The second application scenario involves a second battery pack operating in parallel with the first battery pack after the first battery pack enters sleep or shutdown mode due to low power. The second battery pack has a higher power level than the first. When both the first and second battery packs are connected to a charging device, the first battery pack can be woken up and charged without manual user intervention.

[0030] Based on this, the applicant designed a battery management system so that the battery pack including the battery management system is suitable for at least the two application scenarios mentioned above.

[0031] Figure 3 Here are some block diagrams illustrating the components of the battery management system in examples of this application. For example... Figure 3 As shown, the battery management system 100 includes a wake-up circuit 110, a pull-down circuit 120, a controller 130, and a power supply circuit 140.

[0032] The wake-up circuit 110 is electrically connected to the negative terminal P- of the power supply. The output terminal of the wake-up circuit 110, the first terminal of the pull-down circuit 120, and the controller 130 are electrically connected to the first node N1. The second terminal of the pull-down circuit 120 is electrically connected to the ground terminal GND. The output terminal of the power supply circuit 140 is electrically connected to the wake-up circuit 110.

[0033] The battery management system 100 is configured to control the on / off state of the wake-up circuit 110 based on the voltage difference between the output of the power supply circuit 140 and the negative power supply P-.

[0034] The wake-up process of a battery pack equipped with this battery management system 100 in different application scenarios is as follows: (1) Application scenario for a single battery pack. When a single battery pack enters sleep or shutdown mode due to insufficient power, the electrical signal on the negative terminal P- of the power supply is in a high impedance state. The voltage difference between the output terminal of the power supply circuit 140 and the negative terminal P- of the power supply keeps the wake-up circuit 110 open. The pull-down circuit 120 pulls down the voltage of the first node N1, and one IO port of the controller 130 receives a low level. In this scenario, if the battery pack is electrically connected to the charging device, regardless of whether the negative power supply terminal P- and the negative charging terminal C- are the same terminal, or whether they are different terminals short-circuited, the negative power supply terminal P- will always be electrically connected to the negative charging terminal C-. This causes the voltage on the negative power supply terminal P- to change to the difference between the battery pack voltage and the voltage output by the charging device (understandably, the voltage output by the charging device is generally higher than the battery pack voltage, so the voltage on the negative power supply terminal P- is negative). Subsequently, the voltage difference between the output of the power supply circuit 140 and the negative power supply terminal P- controls the wake-up circuit 110 to switch from an open-circuit state to a closed-circuit state. The voltage output by the power supply circuit 140 acts on the first node N1 through the wake-up circuit 110, corresponding to a high level for the first node N1. The I / O port of the controller 130 receives a high level. Thus, the electrical signal received by the controller 130 switches from a low level to a high level to wake up the controller 130; that is, when the controller 130 receives a rising edge, the battery pack is woken up.

[0035] (2) For parallel operation scenarios. After the first battery pack enters sleep or shutdown mode due to insufficient power, the second battery pack is paralleled with the first battery pack. The power of the second battery pack is greater than that of the first battery pack, and the battery management system of the second battery pack has been woken up and is in working state. Since the power of the second battery pack is greater than that of the first battery pack, the voltage of the second battery pack is greater than that of the first battery pack. At the same time, the discharge switch S1 and the charging switch S2 of the two battery packs are set between the negative terminal B- of the battery module and the negative terminal P- of the power supply. When the second battery pack is paralleled with the first battery pack, the potential of the positive terminal P+ of the power supply remains unchanged and is approximately equal to the potential of the positive terminal B+ of the battery module of the first battery pack. This causes the potential of the negative terminal P- of the power supply to decrease (because the voltage of the second battery pack is greater than that of the first battery pack). As a result, the potential difference between the output terminal of the power supply circuit 140 and the negative terminal P- of the power supply increases, thereby controlling the wake-up circuit 110 to switch from the open circuit state to the closed circuit state, and the controller 130 receives a high level. After that, the wake-up circuit 110 will automatically switch back to the open circuit, and the controller 130 will receive a low level again. In this scenario, if the first and second battery packs are connected in parallel and electrically to the charging device, regardless of whether the negative power supply terminal P- and the negative charging terminal C- are the same terminal, or whether they are two different terminals short-circuited, the voltage output by the charging device is generally higher than the voltage of the battery packs. In this example, the voltage output by the charging device is higher than the voltage of the second battery pack. Because the negative power supply terminal P- is electrically connected to the negative charging terminal C-, its potential decreases again. This further increases the potential difference between the output of the power circuit 140 and the negative power supply terminal P-, thereby controlling the wake-up circuit 110 to switch from an open-circuit state to a closed-circuit state again, and the controller 130 receives a high level. Thus, the controller 130 is woken up by the signal received from low to high level; that is, when the controller 130 receives a rising edge, the first battery pack is woken up.

[0036] It is evident that the battery pack with the battery management system 100 in this application can be used to wake up both a single battery pack and a battery pack that has been connected in parallel, making it highly practical.

[0037] Optionally or additionally, the power supply circuit 140 may include a voltage conversion circuit configured to be electrically connected to the battery module 2000, to step down the voltage output by the battery module 2000, and to power the wake-up circuit 110. In some optional examples, the voltage conversion circuit may include a Buck circuit, a type of DC-DC converter used to convert a higher DC input voltage to a lower, adjustable DC output voltage.

[0038] Optionally or additionally, such as Figure 4 As shown, the wake-up circuit 110 may include an energy storage circuit 111 and a switching circuit 112. The input terminal of the energy storage circuit 111 is electrically connected to the output terminal of the power supply circuit 140, and the switching circuit 112 is electrically connected to the output terminal of the energy storage circuit 111, the negative terminal P- of the power supply, and the output terminal of the power supply circuit 140. The output terminal of the switching circuit 112 is the output terminal of the wake-up circuit 110.

[0039] Controlling the on / off state of the wake-up circuit 110 based on the voltage difference between the output terminal of the power supply circuit 140 and the negative terminal P- of the power supply includes: charging the energy storage circuit 111 based on the change in the voltage difference between the output terminal of the power supply circuit 140 and the negative terminal P- of the power supply, establishing a current path between the switching circuit 112 and the power supply circuit 140 to control the wake-up circuit 110 to be in the on state; and disconnecting the current path between the switching circuit 112 and the power supply circuit 140 in response to the completion of charging of the energy storage circuit 111 to control the wake-up circuit 110 to be in the off state.

[0040] Whether in a single battery pack application scenario or a parallel application scenario with multiple battery packs, the potential of the negative terminal P- of the power supply decreases after the battery pack is electrically connected to the charging device. At this time, the change in voltage difference between the output terminal of the power supply circuit 140 and the negative terminal P- of the power supply charges the energy storage circuit 111. A current path is established between the switching circuit 112 and the power supply circuit 140, and the wake-up circuit 110 is in a conducting state. That is, the wake-up circuit 110 can be controlled to be on by the increase in the voltage difference between the output terminal of the power supply circuit 140 and the negative terminal P- of the power supply. At this time, the voltage output by the output terminal of the power supply circuit 140 acts on the first node N1 through the wake-up circuit 110, corresponding to a high level for the first node N1. The controller 130 receives a high level. Thus, the electrical signal received by the controller 130 switches from a low level to a high level to wake up the controller 130. That is, when the controller 130 receives a rising edge, the battery pack is woken up.

[0041] Subsequently, when the energy storage circuit 111 completes charging, the current path between the switching circuit 112 and the power supply circuit 140 is disconnected, and the wake-up circuit 110 is in an open state. The pull-down circuit 120 pulls down the voltage of the first node N1, and the controller 130 receives a low level.

[0042] Optionally or additionally, such as Figure 5 As shown, the energy storage circuit 111 may include a first capacitor C1. The first end of the first capacitor C1 is electrically connected to the output terminal of the power supply circuit 140, and the second end of the first capacitor C1 is electrically connected to the switching circuit 112. The first end of the first capacitor C1 is the input terminal of the energy storage circuit 111, and the second end of the first capacitor C1 is the output terminal of the energy storage circuit 111.

[0043] Optionally or additionally, the switching circuit 112 may include a second switch Q2, a third switch Q3, a second resistor R2, a third resistor R3, a fourth resistor R4, and a fifth resistor R5. The first end of the second resistor R2 is electrically connected to the output terminal of the energy storage circuit 111. The second end of the second resistor R2 is electrically connected to the first end of the third resistor R3 and the first end of the second switch Q2. The second end of the third resistor R3 and the second end of the second switch Q2 are electrically connected to the negative terminal P- of the power supply. The third end of the second switch Q2 is electrically connected to the first end of the fifth resistor R5 and the first end of the third switch Q3 through the fourth resistor R4. The output terminal of the power supply circuit 140 is electrically connected to the second end of the fifth resistor R5 and the second end of the third switch Q3. The third end of the third switch Q3 is the output terminal of the switching circuit 112.

[0044] The voltage divider formed by the second resistor R2 and the third resistor R3 across the second terminal of the first capacitor C1 drives the second switch Q2 to conduct through the voltage drop across the third resistor R3. The third resistor R3 also discharges charge when the second switch Q2 is off, ensuring reliable switching of Q2. The fifth resistor R5 generates a voltage drop when the second switch Q2 is on, driving the third switch Q3 to conduct. It also discharges charge when the third switch Q3 is off, ensuring reliable switching of Q3.

[0045] In this embodiment, taking an NPN transistor as the second switch Q2 and a PNP transistor as the third switch Q3, the first terminal of the second switch Q2 is the base of the NPN transistor, the second terminal of the second switch Q2 is the emitter of the NPN transistor, and the third terminal of the second switch Q2 is the collector of the NPN transistor; the first terminal of the third switch Q3 is the base of the PNP transistor, the second terminal of the third switch Q3 is the emitter of the PNP transistor, and the third terminal of the third switch Q3 is the collector of the PNP transistor. Optionally or additionally, the second switch can also be an N-type FET, and / or the third switch can also be a P-type FET. For example, as... Figure 6 As shown, the second switch is an N-type FET, and the third switch is a P-type FET.

[0046] Optionally or additionally, the pull-down circuit 120 may include a sixth resistor R6, which is located between the output of the wake-up circuit 110 and the ground terminal GND.

[0047] The following are Figure 5 The working principle of the circuit structure shown will be explained.

[0048] (1) Application scenario for a single battery pack. When a single battery pack enters sleep or shutdown mode due to insufficient power, the negative terminal P- of the power supply is in a high-impedance state. The first capacitor C1 neither charges nor discharges, and the sixth resistor R6 pulls down the voltage of the first node N1, and the controller 130 receives a low level. In this case, if the battery pack is electrically connected to the charging device, the negative terminal P- of the power supply will be electrically connected to the negative terminal C- of the charging device, causing the voltage of the negative terminal P- of the power supply to change to the difference between the voltage of the battery pack and the voltage of the charging device. The voltage difference between the output terminal of the power circuit 140 and the negative terminal P- of the power supply will charge the first capacitor C1. When the first capacitor C1 is charged, the current flows through the first capacitor C1 to the second resistor R2. At this time, the first capacitor C1 is in a short-circuit state. The voltage at the second terminal of the first capacitor C1 is initially equal to the voltage output by the output terminal of the power circuit 140. This voltage is divided by the second resistor R2 and the third resistor R3 and then applied to the second switch Q2, so that the second switch Q2 is turned on, and the third switch Q3 is also turned on. The voltage output from the power supply circuit 140 is applied to the first node N1 via the third switch Q3, resulting in a high level at the first node N1. The I / O port of the controller 130 receives this high level. Thus, the controller 130 receives a rising edge, waking up the battery pack.

[0049] When the first capacitor C1 is fully charged, the voltage at its first terminal equals the voltage output from the power supply circuit 140. The current flowing through the first capacitor C1 decreases to zero, and the first capacitor C1 is in an open-circuit state. The voltage at the second terminal of the first capacitor C1 decreases to zero, and the second switch Q2 and the third switch Q3 are in the off state. The sixth resistor R6 pulls down the voltage at the first node N1, and the I / O port of the controller 130 receives a low level.

[0050] (2) For parallel operation scenarios. After the first battery pack enters sleep or shutdown mode due to insufficient power, the second battery pack operates in parallel with the first battery pack. The power of the second battery pack is greater than that of the first battery pack, and the second battery pack has been woken up. After the second battery pack operates in parallel with the first battery pack, since the power of the second battery pack is greater than that of the first battery pack, the voltage of the second battery pack is greater than that of the first battery pack. As a result, the potential of the negative terminal P- of the power supply decreases, and the voltage difference between the output terminal of the power supply circuit 140 and the negative terminal P- of the power supply increases, causing the first capacitor C1 to be charged. The second switch Q2 and the third switch Q3 are turned on, and the IO port of the controller 130 receives a high level. After the first capacitor C1 is fully charged, the second switch Q2 and the third switch Q3 are both turned off. The sixth resistor R6 pulls down the voltage of the first node N1, and the IO port of the controller 130 receives a low level. In this scenario, if the first and second battery packs are connected in parallel and then electrically connected to the charging device, the potential of the negative terminal P- of the power supply decreases again. This increases the voltage difference between the output of the power supply circuit 140 and the negative terminal P-, charging the first capacitor C1. The second switch Q2 and the third switch Q3 then conduct, and the I / O port of the controller 130 receives a high level. Upon receiving a rising edge, the controller 130 wakes up the low-voltage battery pack, specifically the first battery pack.

[0051] In summary, the battery pack described above in this application is applicable to both waking up a single battery pack and waking up a battery pack that has been connected in parallel, making it highly practical.

[0052] Optionally or additionally, such as Figure 7 As shown, the wake-up circuit 100 may also include a discharge circuit 150. The input terminals of the discharge circuit 150, the energy storage circuit 111, and the output terminal of the power supply circuit 140 are electrically connected to the second node N2, and the output terminal of the discharge circuit 150 is electrically connected to the input terminal of the switch circuit 112.

[0053] The discharge circuit 150 provides a current path for the discharge of charge from the energy storage circuit 111. Thus, the charge in the energy storage circuit 111 can be discharged quickly in preparation for the next wake-up process of the controller 130.

[0054] Optionally or additionally, such as Figure 8As shown, the discharge circuit 150 includes a first resistor R1, a first switch Q1, and a first diode D1. The first end of the first resistor R1 and the third end of the first switch Q1 are electrically connected to the second node N2. The second end of the first resistor R1 is electrically connected to the first end of the first switch Q1 and the cathode of the first diode D1. The second end of the first switch Q1, the output terminal of the energy storage circuit 111 (i.e., the second end of the first capacitor C1), and the anode of the first diode D1 are electrically connected to the third node N3. The first end of the second resistor R2 is electrically connected to the output terminal of the energy storage circuit 111 through the discharge circuit 150. The cathode of the first diode D1 is the output terminal of the discharge circuit 150.

[0055] Specifically, the resistance of the first resistor R1 can be set to a relatively large value, for example, in the megohm range, to prevent the voltage output by the power supply circuit 140 from driving the second switch Q2 to conduct through the first resistor R1. The first resistor R1 also serves as a current limiter to restrict the current input to the first terminal of the first switch Q1, thereby reducing the risk of damage to the first switch Q1. The first diode D1 is used to create a voltage difference between the first and second terminals of the first switch Q1 to ensure that the first diode D1 can conduct stably.

[0056] As described above, when the battery pack, including the battery management system 100, is electrically connected to the charging device, the first capacitor C1 will be fully charged. Afterwards, if the user disconnects the battery pack from the charging device, the first capacitor C1 begins to discharge. The first capacitor C1 discharges through the first resistor R1, generating a discharge current. This discharge current drives the first switch Q1 to turn on, and the first capacitor C1 then discharges again through the first switch Q1.

[0057] In this embodiment, taking an NPN transistor as an example, the first terminal of the first switch Q1 is the base of the NPN transistor, the second terminal of the first switch Q1 is the emitter of the NPN transistor, and the third terminal of the first switch Q1 is the collector of the NPN transistor. Optionally or additionally, the first switch Q1 can be an N-type FET, such as... Figure 9 As shown.

[0058] Optionally or additionally, such as Figure 10 As shown, the battery management system 100 may further include a seventh resistor R7 and a second capacitor C2. The first terminal of the seventh resistor R7 is electrically connected to the first node N1, the second terminal of the seventh resistor R7 is electrically connected to the controller 130 and the first terminal of the second capacitor C2, and the second terminal of the second capacitor C2 is electrically connected to the ground terminal GND. The seventh resistor R7 and the second capacitor C2 form an RC filter.

[0059] Some embodiments of this application also provide an electrical device. This electrical device includes a load and the battery pack described above. The load includes electrical components on the electrical device such as motors, lights, horns, and instruments. The electrical device is a device that requires power from the battery pack. For example, the electrical device includes: unmanned aerial vehicles, energy storage products, power tools, electric vehicles (electric two-wheelers, electric tricycles), etc.

[0060] The above description is merely an embodiment of this application and does not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

[0061] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Within the framework of this application, the technical features of the above embodiments or different embodiments can also be combined, and the steps can be implemented in any order. Those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A battery management device, comprising: A connector and a battery management system connected with the connector, characterized in that, The connector comprises a power negative electrode and a charging negative electrode, wherein the power negative electrode and the charging negative electrode are the same terminal, or the power negative electrode and the charging negative electrode are short-circuited. The battery management system comprises: A charging switch and a discharging switch, which are arranged on a current path from the power negative electrode to a negative electrode of a battery module; A wake-up circuit electrically connected to the power negative electrode; A pull-down circuit and a controller, wherein an output end of the wake-up circuit, a first end of the pull-down circuit and the controller are electrically connected to a first node, and a second end of the pull-down circuit is electrically connected to a ground end; A power supply circuit, wherein an output end of the power supply circuit is electrically connected to the wake-up circuit; The battery management system is configured to control the wake-up circuit to be in a conduction state or an open state based on a voltage difference between the output end of the power supply circuit and the power negative electrode.

2. The battery management device according to claim 1, characterized by, The wake-up circuit comprises: An energy storage circuit, wherein an input end of the energy storage circuit is electrically connected to the output end of the power supply circuit; A switch circuit, wherein the switch circuit is electrically connected to an output end of the energy storage circuit, the power negative electrode and the output end of the power supply circuit, and an output end of the switch circuit is the output end of the wake-up circuit; The control of the wake-up circuit to be in the conduction state or the open state based on the voltage difference between the output end of the power supply circuit and the power negative electrode comprises: Based on the change of the voltage difference between the output end of the power supply circuit and the power negative electrode, the energy storage circuit is charged, and a current path of the switch circuit is established to control the wake-up circuit to be in the conduction state; In response to the completion of the charging of the energy storage circuit, the current path of the switch circuit is disconnected to control the wake-up circuit to be in the open state.

3. The battery management device according to claim 2, characterized by, The energy storage circuit comprises a first capacitor; A first end of the first capacitor is electrically connected to the output end of the power supply circuit, and a second end of the first capacitor is electrically connected to the switch circuit; The first end of the first capacitor is the input end of the energy storage circuit, and the second end of the first capacitor is the output end of the energy storage circuit.

4. The battery management device according to claim 2 or 3, characterized by, The wake-up circuit comprises: A discharging circuit, wherein the discharging circuit, an input end of the energy storage circuit and an output end of the power supply circuit are electrically connected to a second node, and an output end of the discharging circuit is electrically connected to an input end of the switch circuit; The discharging circuit is used to provide a current path for the charge discharge of the energy storage circuit.

5. The battery management device according to claim 4, characterized by, The discharging circuit comprises a first resistor, a first switch and a first diode; A first end of the first resistor and a third end of the first switch are electrically connected to the second node, a second end of the first resistor is electrically connected to a first end of the first switch and a cathode of the first diode, a second end of the first switch, an output end of the energy storage circuit and an anode of the first diode are electrically connected to a third node; The cathode of the first diode is the output end of the discharging circuit, and the first switch is an NPN triode or an N-type FET.

6. The battery management device according to any one of claims 2-5, characterized in that, The switch circuit comprises a second switch, a third switch, a second resistor, a third resistor, a fourth resistor and a fifth resistor; The first end of the second resistor is electrically connected to the output end of the energy storage circuit, or the first end of the second resistor is electrically connected to the output end of the energy storage circuit through a discharge circuit, The second end of the second resistor is electrically connected to the first end of the third resistor and the first end of the second switch, The second end of the third resistor is electrically connected to the second end of the second switch and the negative electrode of the power supply, The third end of the second switch is electrically connected to the first end of the fifth resistor and the first end of the third switch through the fourth resistor, The output end of the power supply circuit is electrically connected to the second end of the fifth resistor and the second end of the third switch, and the third end of the third switch is the output end of the switch circuit.

7. The battery management device according to claim 6, characterized in that, The second switch is an NPN triode or an N-type FET, and the third switch is a PNP triode or a P-type FET.

8. The battery management device according to any one of claims 1 to 7, characterized by, The pull-down circuit includes a sixth resistor, which is arranged between the output end of the wake-up circuit and the ground end.

9. The battery management device according to any one of claims 1 to 8, characterized by, The battery management system further includes a seventh resistor and a second capacitor; The first end of the seventh resistor is electrically connected to the first node, and the seventh resistor is electrically connected to the controller and the first end of the second capacitor, and the second end of the second capacitor is electrically connected to the ground end.

10. The battery management device according to any one of claims 1 to 9, characterized by, The power supply circuit includes a voltage conversion circuit, which is configured to be electrically connected to the battery module, step down the voltage output by the battery module, and supply power to the wake-up circuit.

11. A battery pack, characterized by The battery management device includes a battery module and the battery management system according to any one of claims 1-10, and the battery module is electrically connected to the battery management system. The power supply circuit is electrically connected to the positive electrode of the battery module.

12. An electrical device, characterized by The battery pack includes a load and the battery pack according to claim 11.

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