BMS detection wake-up combination circuit and BMS wake-up system

Abstract

The invention discloses a BMS detection wake-up combination circuit and a BMS wake-up system, in the BMS detection wake-up combination circuit, a wake-up detection circuit comprises a wake-up signal state detection port, a power supply, a communication control module and a wake-up signal pin; the wake-up signal state detection port, the power supply and the communication control module are connected to a first node, the communication control module and the wake-up signal pin are connected to a second node, the communication control module and the negative electrode B-of the battery are connected to a third node, and the communication control module is used for switching on the power supply when the wake-up signal pin is connected to a first level. When the wake-up signal pin is connected to the first level, the first node is electrically communicated with the third node, and when the wake-up signal pin is connected to the second level, the first node is communicated with the second node; the first level and the second level are voltages of positive and negative electrodes of the battery, and the output voltage of the power supply is smaller than the first level and larger than the second level; and the level control circuit is used for controlling the connectivity of P + and P-. No matter in low-side driving or high-side driving, the BMS can be awakened when the awakening signal pin is in short circuit with P + or P-.

Description

Technical Field

[0001] The present invention relates to the technical field of battery management systems, and in particular to a BMS detection and wake-up combination circuit and a BMS wake-up system. Background Art

[0002] A battery management system (BMS) generally has an external wake-up function, which is mainly used to wake up the BMS through an external signal or event when the BMS is in a dormant state, so as to perform a specific task or respond to an external request.

[0003] In a battery pack with multiple cells connected in series, the positive terminal (P+) of the battery pack is the connection point for all the positive terminals of the battery pack, representing the external positive terminal of the entire battery pack. The negative terminal (P-) of the battery pack is the connection point for all the negative terminals of the battery pack, representing the external negative terminal of the entire battery pack. Generally, the BMS is required to be awakened by shorting the external wake-up pin to the positive or negative terminal of the battery pack when in sleep mode.

[0004] MOS transistor is short for MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor) and is one of the commonly used power devices in BMS. The BMS is responsible for monitoring, controlling, and protecting the battery to ensure efficient operation and safety. MOS transistors are mainly used in the BMS to control battery charging and discharging. In the BMS, depending on the position of the charge and discharge switch MOS transistor, it is divided into two types: high-side drive and low-side drive:

[0005] If the charge and discharge switch MOS tube is a low-side driver, when the BMS is in sleep mode, the negative electrode B- of the battery is disconnected from the negative electrode P- of the battery pack, that is, the negative electrode P- of the battery pack is floating, and the negative electrode B+ of the battery is connected to the negative electrode P+ of the battery pack;

[0006] If the charge and discharge switch MOS tube is a low-side driver, when the BMS is in sleep mode, the positive electrode B+ of the battery is disconnected from the positive electrode P+ of the battery pack, that is, the positive electrode P+ of the battery pack is floating, and the negative electrode B- of the battery is connected to the negative electrode P- of the battery pack;

[0007] The wake-up circuit cannot ensure that the BMS can be properly awakened by shorting the wake-up signal pin to the positive terminal P+ or negative terminal P- of the battery pack. For example, when the BMS is driven by a high-side driver, the wake-up pin can only be awakened by shorting the negative terminal P- of the battery pack; when the BMS is driven by a low-side driver, the wake-up pin can only be awakened by shorting the positive terminal P+ of the battery pack. This has poor adaptability and cannot meet user needs. Summary of the Invention

[0008] The present invention provides a BMS detection and wake-up combination circuit and a BMS wake-up system to solve the problem of poor adaptability of a specific wake-up connection mode corresponding to an existing wake-up circuit.

[0009] In a first aspect, the present invention provides a BMS detection and wake-up combination circuit, comprising a wake-up detection circuit and a level control circuit.

[0010] The wake-up detection circuit includes a wake-up signal status detection port, a power supply, a connectivity control module, and a wake-up signal pin. The power supply is used to provide a constant DC voltage. The wake-up signal status detection port is connected to the control center of the BMS.

[0011] The wake-up signal state detection port, the power supply, and the connectivity control module are connected to a first node, the connectivity control module and the wake-up signal pin are connected to a second node, and the connectivity control module and the negative electrode B- of the battery are connected to a third node. The connectivity control module is configured to electrically connect the first node with the third node when the wake-up signal pin is connected to a first electrical level, and to connect the first node with the second node when the wake-up signal pin is connected to a second electrical level.

[0012] The first level is the voltage of the positive electrode B+ of the battery, the second level is the voltage of the negative electrode B- of the battery, and the output voltage of the power supply is less than the first level and greater than the second level;

[0013] The level control circuit is arranged between the positive electrode P+ and the negative electrode P−, and is used to control the connectivity between the positive electrode P+ and the negative electrode P− of the battery pack.

[0014] In a second aspect, the present invention provides a BMS wake-up system, comprising a BMS and a BMS detection wake-up combination circuit as described in the first aspect, wherein the BMS detection wake-up combination circuit includes a wake-up signal status detection port, and the BMS includes a control center, which is connected to the wake-up signal status detection port, and the control center is used to wake up the BMS when the wake-up signal status detection port detects a level change.

[0015] A BMS detection and wake-up combination circuit according to an embodiment of the present invention includes a BMS detection and wake-up combination circuit, including a wake-up detection circuit and a level control circuit. The wake-up detection circuit includes a wake-up signal state detection port, a power supply, a connectivity control module, and a wake-up signal pin. The power supply is used to provide a constant DC voltage. The wake-up signal state detection port, the power supply, and the connectivity control module are connected to a first node. The connectivity control module is connected to the wake-up signal pin at a second node. The connectivity control module is connected to the negative electrode B- of the battery at a third node. The connectivity control module is used to electrically connect the first node with the third node when the wake-up signal pin is connected to a first level, and to connect the first node with the second node when the wake-up signal pin is connected to a second level. The first level is the voltage of the positive electrode B+ of the battery, and the second level is the voltage of the negative electrode B- of the battery. The output voltage of the power supply is less than the first level and greater than the second level. The level control circuit is arranged between the positive electrode P+ and the negative electrode P-, and is used to control the connectivity between the positive electrode P+ and the negative electrode P- of the battery pack.

[0016] Its working principle and beneficial effects are:

[0017] When the wake-up signal pin is not connected to a level, the level of the wake-up signal status detection port is the output voltage of the power supply. When the charge and discharge MOS tube is a low-side driver, the negative electrode P- of the battery pack is floating, the positive electrode P+ of the battery pack is connected to the positive electrode B+ of the battery, and the positive electrode P+ of the battery pack is at a first level. When the wake-up signal pin 14 is connected to the positive electrode P+ of the battery pack, it is equivalent to the wake-up signal pin being connected to the first level. At this time, the first node is electrically connected to the third node, and the level of the wake-up signal status detection port is pulled down from the output voltage of the power supply to the second level of the negative electrode B- of the battery, that is, a voltage change occurs, and the BMS is awakened; when the wake-up signal pin is connected to the negative electrode P- of the battery pack, the level control circuit controls the positive electrode P+ and the negative electrode P- of the battery pack to be connected, that is, the wake-up signal pin is connected to the positive electrode P+ of the battery pack through the negative electrode P- of the battery pack, the wake-up signal pin is connected to the first level, and the BMS is also awakened;

[0018] When the charging and discharging MOS tube is driven by the high side, the positive electrode P+ of the battery pack is floating, and the negative electrode P- of the battery pack is connected to the negative electrode B- of the battery. Then the negative electrode P- of the battery pack is at the second level. When the wake-up signal pin is connected to the positive electrode P+ of the battery pack, the level control circuit controls the positive electrode P+ and the negative electrode P- of the battery pack to be connected, and the wake-up signal pin is connected to the negative electrode P-. The wake-up signal pin is connected to the second level. At this time, the first node is electrically connected to the second node, and the level of the wake-up signal status detection port is pulled down from the output voltage of the power supply to the second level of the negative electrode B- of the battery, that is, a voltage change occurs, and the BMS is awakened; when the wake-up signal pin is connected to the negative electrode P- of the battery, it is equivalent to the wake-up signal pin being connected to the second level of the negative electrode B- of the battery, and the BMS is also awakened.

[0019] The BMS detection and wake-up combination circuit provided in this embodiment can wake up the BMS regardless of whether the charging and discharging MOS tube is low-side driven or high-side driven, as long as the wake-up signal pin is connected to the positive electrode P+ or negative electrode P- of the battery pack. The circuit is simple and reliable and is applicable to BMSs with different drive modes to meet different user needs.

[0020] It should be understood that the content described in this section is not intended to identify the key or important features of the embodiments of the present invention, nor is it intended to limit the scope of the present invention. Other features of the present invention will become readily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0022] Figure 1 1 is a schematic structural diagram of a BMS in a low-side drive mode provided by an embodiment of the present invention;

[0023] Figure 2 1 is a schematic structural diagram of a BMS in a high-side driving mode provided by an embodiment of the present invention;

[0024] Figure 3 This is a structural diagram of a BMS detection and wake-up combination circuit provided by an embodiment of the present invention;

[0025] Figure 4 This is a structural diagram of a BMS detection and wake-up combination circuit provided by an embodiment of the present invention;

[0026] Reference numerals: 10, wake-up detection circuit; 11, wake-up signal status detection port; 12, power supply; 13, connectivity control module; 14, wake-up signal pin; 20, level control circuit. DETAILED DESCRIPTION

[0027] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0028] Low-side drivers are usually used for loads related to the powertrain, such as motors, heaters, etc. High-side drivers are often used for fuel pumps and body-related functions, such as seats, lighting, wipers, and fans. Figure 1 and Figure 2 Describe the driving methods corresponding to different positions of the charging and discharging MOS tubes.

[0029] Figure 1 This is a structural diagram of a BMS when it is driven by a low side. Figure 1 As shown in the figure, the discharge MOS (i.e., the MOS tube for discharge control) and the charge MOS (i.e., the MOS tube for charge control) are both located below the circuit. When the BMS is dormant, the discharge MOS and the charge MOS are both disconnected, the negative electrode B- of the battery and the negative electrode P- of the battery pack are disconnected, the negative electrode P- is floating, and the positive electrode B+ of the battery and the positive electrode P+ of the battery pack are connected. Then, the voltage of the positive electrode P+ of the battery pack is the voltage of the positive electrode B+ of the battery.

[0030] Figure 2 This is a structural diagram of a BMS when it is driven by a high side. Figure 2 As shown in the figure, both the discharge MOS and the charge MOS are located above the circuit. When the BMS is dormant, both the discharge MOS and the charge MOS are disconnected, the positive electrode B+ of the battery and the positive electrode P+ of the battery pack are disconnected, the positive electrode P+ is floating, and the negative electrode B- of the battery and the negative electrode P- of the battery pack are connected. Then, the voltage of the negative electrode P- of the battery pack is the voltage of the negative electrode B- of the battery.

[0031] like Figure 1 and Figure 2 As shown in the figure, in the BMS, the AFE (Analog Front End) is used to monitor the voltage, current and temperature of each battery cell and perform some protection actions when necessary. The MCU is the control center and is used to protect the charging control.

[0032] Figure 3 A schematic diagram of a BMS detection and wake-up combination circuit provided by an embodiment of the present invention is shown in FIG. Figure 3 As shown, the BMS detection wake-up combination circuit includes a wake-up detection circuit 10 and a level control circuit 20. The wake-up detection circuit 10 includes a wake-up signal status detection port 11, a power supply 12, a connection control module 13 and a wake-up signal pin 14. The power supply 12 is used to provide a constant DC voltage; the wake-up signal status detection port 11 is also connected to the control center (MCU) in the BMS.

[0033] The wake-up signal status detection port 11, the power supply 12, and the connectivity control module 13 are connected to a first node S1. The connectivity control module 13 and the wake-up signal pin 14 are connected to a second node S2. The connectivity control module 13 and the negative electrode B- of the battery are connected to a third node S3. The connectivity control module 13 is configured to electrically connect the first node S1 with the third node S3 when the wake-up signal pin 14 is connected to a first electrical level, and to connect the first node S1 with the second node S2 when the wake-up signal pin is connected to a second electrical level.

[0034] The first level is the voltage of the positive electrode B+ of the battery, the second level is the voltage of the negative electrode B- of the battery, and the output voltage of the power supply 12 is less than the first level and greater than the second level; optionally, the second level is a stable low level, such as 0.5V, and the output voltage of the power supply 12 is 3V.

[0035] The level control circuit 20 is provided between the positive electrode P+ and the negative electrode P-, and is used to control the connectivity of the positive electrode P+ and the negative electrode P- of the battery pack. Specifically, the level control circuit 20 controls the connectivity of the positive electrode P+ and the negative electrode P- of the battery pack according to the driving mode of the charge and discharge MOS tube and the battery pack output terminal (P+ / P-) to which the wake-up signal pin 14 is connected, so that the wake-up signal pin 14 can be electrically connected to the non-floating (having the first level or the second level) battery pack output terminal, that is, the wake-up signal pin 14 can be controlled to be connected to the first level or the second level, thereby waking up the BMS.

[0036] The working principle of the BMS detection wake-up combination circuit is:

[0037] The level of the wake-up signal status detection port 11 is close to the voltage of the first node S1 and has the same voltage change trend. When the wake-up signal pin 14 is not connected to the level, the level of the wake-up signal status detection port 11 is the output voltage of the power supply 12. When the charging and discharging MOS tube is a low-side drive, the negative electrode P- of the battery pack is disconnected from the negative electrode B- of the battery, and the positive electrode P+ of the battery pack is connected to the positive electrode B+ of the battery. Then the negative electrode P- of the battery pack is floating, and the positive electrode P+ of the battery pack is at the first level. When the wake-up signal pin 14 is connected to the positive electrode P+ of the battery pack, it is equivalent to the wake-up signal pin 14 being connected to the first level. At this time, the first node S1 is electrically connected to the third node S3, and the third node S3 is electrically connected to the battery. When the negative electrode B- is connected, the voltage of the first node S1 is pulled down from the output voltage of the power supply 12 to the second level of the negative electrode B- of the battery, which is equivalent to the voltage of the wake-up signal status detection port 11 also being pulled down from the output voltage of the power supply 12 to the second level of the negative electrode B- of the battery, that is, a voltage change occurs. The control center detects the voltage change of the wake-up signal status detection port 11, and the BMS is awakened; when the wake-up signal pin 14 is connected to the negative electrode P- of the battery pack, the level control circuit 20 controls the positive electrode P+ and the negative electrode P- of the battery pack to be connected, that is, the wake-up signal pin is connected to the positive electrode P+ of the battery pack through the negative electrode P- of the battery pack, and the wake-up signal pin is connected to the first level, and the BMS is also awakened;

[0038] When the charging and discharging MOS transistor is high-side driven, the positive electrode P+ of the battery pack is disconnected from the positive electrode B+ of the battery, and the negative electrode P- of the battery pack is connected to the negative electrode B- of the battery. The positive electrode P+ of the battery pack is floating, and the negative electrode P- of the battery pack is at the second level. When the wake-up signal pin is connected to the positive electrode P+ of the battery pack, the level control circuit 20 controls the positive electrode P+ and the negative electrode P- of the battery pack to be connected, and the wake-up signal pin 14 is connected to the negative electrode P-. The wake-up signal pin 14 is connected to the second level. At this time, the first node S1 is electrically connected to the second node S2, and the voltage of the second node S2 is equal to the voltage of the wake-up signal pin 14. The level of the wake-up signal status detection port 11 is pulled down from the output voltage of the power supply 12 to the second level of the negative electrode B- of the battery, that is, a voltage change occurs. The control center wakes up the BMS when it detects the level change of the wake-up signal status detection port 11. When the wake-up signal pin 14 is connected to the negative electrode P- of the battery pack, it is equivalent to the wake-up signal pin 14 being connected to the second level of the negative electrode B- of the battery, and the BMS is also awakened.

[0039] The BMS detection and wake-up combination circuit provided in this embodiment can wake up the BMS regardless of whether the charging and discharging MOS tube is low-side driven or high-side driven, as long as the wake-up signal pin is connected to the positive electrode P+ or negative electrode P- of the battery pack. The circuit is simple and reliable and is applicable to BMSs with different drive modes to meet different user needs.

[0040] Figure 4Schematic diagram of a BMS detection and wake-up combination circuit. In an optional embodiment, the connection control module 13 includes a diode D1, a transistor Q1, a diode D2, and a Zener diode D3; the anode of the diode D1 and the anode of the diode D2 are respectively connected to the first node S1; the first level is higher than the reverse breakdown voltage of the Zener diode D3; Figure 4 In the figure, VCC3V3 represents the positive terminal voltage of the 3.3V power supply in the circuit, which is used to provide a stable power supply for the components in the circuit.

[0041] The cathode of diode D2 and the cathode of Zener diode D3 are respectively connected to the second node S2; the anode of Zener diode D3 is connected to the fourth node S4, the collector of transistor Q1 is connected to the cathode of diode D1, the emitter of transistor Q1 is connected to the third node S3, and the base of transistor Q1 is connected to the fourth node S4.

[0042] The working principle of the connection control module 13 (combined with the level control circuit 20) is:

[0043] Transistor Q1 is an NPN transistor. When Zener diode D3 is not broken down, there is no voltage at the base of transistor Q1 (i.e., the fourth node), which does not meet the conduction condition for transistor Q1. Therefore, transistor Q1 is cut off. At this time, transistor Q1 is equivalent to a high resistance, equivalent to the switch being in the off state. Therefore, no current flows from the first node S1 to the third node S3. When Zener diode D3 is not reversely broken down, it is equivalent to the switch being in the off state, and no current flows from the first node S1 to the fourth node S4. That is, when the wake-up signal pin 14 is not connected to a voltage level, no current flows in the connection control module 13, and the voltage level of the first node S1 is stable at the output voltage of the power supply 12.

[0044] When the charging and discharging MOS tube is low-side driven, the negative electrode P- of the battery pack is disconnected from the negative electrode B- of the battery, and the positive electrode P+ of the battery pack is connected to the positive electrode B+ of the battery. Then the negative electrode P- of the battery pack is floating, and the positive electrode P+ of the battery pack is at the first level. The low-side drive includes the following two short-circuit wake-up methods:

[0045] The wake-up signal pin 14 is short-circuited to P+: When the wake-up signal pin 14 is connected to the positive electrode P+ of the battery pack, it is equivalent to the wake-up signal pin 14 being connected to the first level (high level). Since the first level is higher than the reverse breakdown voltage of the Zener diode D3, the Zener diode D3 maintains a certain voltage after reverse breakdown (the specific setting is based on actual needs), and makes the base voltage of the transistor Q1 (equivalent to the voltage of the fourth node S4) and the emitter voltage V beWhen the voltage of the first node S1 is greater than the turn-on threshold (generally 0.7V), the transistor Q1 is turned on, which is equivalent to a low resistance, so that the first node S1 is electrically connected to the third node S3, and the third node S3 is connected to the negative electrode B- of the battery. Then, the voltage of the first node S1 is pulled down from the output voltage of the power supply 12 to the second level of the negative electrode B- of the battery, which is equivalent to the voltage of the wake-up signal status detection port 11 also being pulled down from the output voltage of the power supply 12 to the second level of the negative electrode B- of the battery, that is, a voltage change occurs. The control center detects that the voltage of the wake-up signal status detection port 11 has changed, and the BMS is awakened.

[0046] The wake-up signal pin 14 is short-circuited to P-: When the wake-up signal pin 14 is connected to the negative electrode P- of the battery pack, the level control circuit 20 controls the positive electrode P+ and the negative electrode P- of the battery pack to be connected. That is, the wake-up signal pin is connected to the positive electrode P+ of the battery pack through the negative electrode P- of the battery pack. At this time, the wake-up signal pin 14 is short-circuited to P+ in the same way as the low-side drive, and the BMS is also awakened.

[0047] When the charging and discharging MOS tube is high-side driven, the positive electrode P+ of the battery pack is disconnected from the positive electrode B+ of the battery, and the negative electrode P- of the battery pack is connected to the negative electrode B- of the battery. Then the positive electrode P+ of the battery pack is floating, and the negative electrode P- of the battery pack is at the second level. The high-side drive includes the following two short-circuit wake-up methods:

[0048] The wake-up signal pin 14 is short-circuited to P+: When the wake-up signal pin is connected to the positive electrode P+ of the battery pack, the level control circuit 20 controls the positive electrode P+ and the negative electrode P- of the battery pack to be connected, and the wake-up signal pin 14 is connected to the negative electrode P-, and the wake-up signal pin 14 is connected to the second level. The second level is less than the output voltage of the power supply 12, so the diode D2 is turned on. At this time, the first node S1 is electrically connected to the second node S2, and the voltage of the second node S2 is equal to the voltage of the wake-up signal pin 14. The level of the first node S1 is pulled down from the output voltage of the power supply 12 to the second level of the negative electrode B- of the battery, that is, the voltage of the wake-up signal status detection port 11 changes. The control center wakes up the BMS when it detects that the level of the wake-up signal status detection port 11 changes; when the wake-up signal pin 14 is connected to the negative electrode P- of the battery pack, it is equivalent to the wake-up signal pin 14 being connected to the second level of the negative electrode B- of the battery, and the BMS is also awakened.

[0049] Through the connection control module, no matter which battery pack output terminal (P+ / P-) the wake-up signal pin 14 is connected to, the voltage of the first node S1 can be changed, thereby changing the voltage of the wake-up signal state detection port 11.

[0050] In an optional embodiment, the connectivity control module further includes a fourth resistor R4 and a sixth resistor R6. The fourth resistor R4 is located between the first node and the diode D2, and the sixth resistor R6 is located between the voltage-stabilizing diode D3 and the fourth node. The connectivity control module further includes a fifth resistor R5, located between the third node and the fourth node. The fourth resistor R4 and the sixth resistor R6 primarily function to divide voltage and limit current, thereby reducing circuit power consumption and preventing damage to components due to excessive current. The fifth resistor R5 serves as the base resistor of transistor Q1.

[0051] In an optional embodiment, if Figure 4 As shown, the level control circuit 20 includes a control pin CTR, a diode D4, and a transistor Q2 connected in sequence. The base, collector, and emitter of the transistor Q2 are connected to the cathode of the diode D4, the positive electrode P+ of the battery pack, and the negative electrode P- of the battery pack, respectively. When P+ is floating and the wake-up signal pin 14 is connected to P+ or P- is floating and the wake-up signal pin 14 is connected to P-, the control pin (CTR) outputs a high level, so that the diode D4 and the transistor Q2 are turned on, and then the P+ and P- are turned on, so that the wake-up signal pin 14 is connected to the non-floating battery pack output terminal. In one example, when the BMS wakes up, the charge and discharge MOS tubes are closed. At this time, the control CTR can output a low level, so that Q2 is disconnected, which can reduce the power consumption of the BMS.

[0052] Optional, such as Figure 4 As shown, the level control circuit 20 further includes a seventh resistor R7 and an eighth resistor R8. The seventh resistor R7 is located between the positive electrode P+ of the battery pack and the collector of the transistor Q2, and the eighth resistor R8 is located between the base of the transistor Q2 and the cathode of the diode D4. Similarly, the seventh resistor R7 and the eighth resistor R8 function to limit current and divide voltage.

[0053] In an optional embodiment, if Figure 4 As shown, the BMS detection and wake-up combination circuit also includes a first resistor R1 and a second resistor R2. The first resistor R1 is set between the wake-up signal status detection port 11 (MCU ACC AI) and the negative electrode B- of the battery. The second resistor R2 is set between the wake-up signal status detection port 11 and the first node. The resistance of the first resistor R1 is greater than the resistance of the second resistor R2. The first resistor R1 acts as a pull-down resistor, which can improve the stability and accuracy of the voltage level of the wake-up signal status detection port 11.

[0054] The BMS detection and wake-up combination circuit also includes a third resistor R3, which is arranged between the power supply 12 and the first node S1. The second resistor R2 and the third resistor R3 function to limit current and divide voltage. The resistance of the third resistor R3 is also relatively small.

[0055] In an optional embodiment, if Figure 4 As shown, the BMS detection and wake-up combination circuit further includes a capacitor C1, one end of which is connected to the second node S2, and the other end is connected to the negative electrode B- of the battery. The function of the capacitor C1 is to prevent static electricity.

[0056] Corresponding to the above-mentioned BMS detection wake-up combination circuit, the present invention also provides a BMS wake-up system, including a BMS and the above-mentioned BMS detection wake-up combination circuit, the BMS detection wake-up combination circuit includes a wake-up signal state detection port, the BMS includes a control center, the control center is connected to the wake-up signal state detection port, and the control center is used to wake up the BMS when the wake-up signal state detection port detects a level change. The BMS can refer to Figure 1 or Figure 2 The circuit structure shown in the figure does not limit the structure of the BMS in the present invention. The BMS wake-up system has the same circuit structure as the BMS detection wake-up combination circuit and also has the corresponding technical effects.

[0057] In the description of this specification, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0058] In this specification, reference to terms such as "one embodiment" or "example" means that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example.

[0059] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the purpose of clarifying the device. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0060] The technical principles of the present invention have been described above with reference to specific embodiments. These descriptions are intended solely to illustrate the principles of the present invention and are not to be construed in any way as limiting the scope of protection of the present invention. Based on the explanations herein, those skilled in the art will readily conceive of other specific embodiments of the present invention without inventive effort, and such embodiments will fall within the scope of protection of the present invention.

Claims

1. A BMS detection wake-up combination circuit, characterized in that: Including wake-up detection circuit and level control circuit, The wake-up detection circuit includes a wake-up signal status detection port, a power supply, a connectivity control module, and a wake-up signal pin. The power supply is used to provide a constant DC voltage. The wake-up signal status detection port is connected to the control center of the BMS. The wake-up signal state detection port, the power supply, and the connectivity control module are connected to a first node, the connectivity control module and the wake-up signal pin are connected to a second node, and the connectivity control module and the negative electrode B- of the battery are connected to a third node. The connectivity control module is configured to electrically connect the first node with the third node when the wake-up signal pin is connected to a first electrical level, and to connect the first node with the second node when the wake-up signal pin is connected to a second electrical level. The first level is the voltage of the positive electrode B+ of the battery, the second level is the voltage of the negative electrode B- of the battery, and the output voltage of the power supply is less than the first level and greater than the second level; The level control circuit is arranged between the positive electrode P+ and the negative electrode P−, and is used to control the connectivity between the positive electrode P+ and the negative electrode P− of the battery pack.

2. The BMS detection and wake-up combination circuit according to claim 1, characterized in that: The connectivity control module includes a diode D1, a transistor Q1, a diode D2, and a voltage-stabilizing diode D3; the anode of the diode D1 and the anode of the diode D2 are respectively connected to the first node; the first level is higher than the reverse breakdown voltage of the voltage-stabilizing diode D3; The cathode of the diode D2 and the cathode of the voltage stabilizing diode D3 are connected to the second node respectively; the anode of the voltage stabilizing diode D3 is connected to the fourth node. The collector of the transistor Q1 is connected to the cathode of the diode D1 , the emitter of the transistor Q1 is connected to the third node, and the base of the transistor Q1 is connected to the fourth node.

3. The BMS detection and wake-up combination circuit according to claim 2, characterized in that: The connectivity control module further includes a fourth resistor and a sixth resistor. The fourth resistor is located between the first node and the diode D2 , and the sixth resistor is located between the voltage stabilizing diode D3 and the fourth node.

4. The BMS detection and wake-up combination circuit according to claim 2, wherein: The communication control module further includes a fifth resistor located between the third node and the fourth node.

5. The BMS detection wake-up combination circuit according to claim 1, characterized in that: The level control circuit includes a control pin, a diode D4 and a transistor Q2 connected in sequence, wherein the base, collector and emitter of the transistor Q2 are connected to the cathode of the diode D4, the positive electrode P+ of the battery pack and the negative electrode P- of the battery pack respectively.

6. The BMS detection and wake-up combination circuit according to claim 5, characterized in that: The level control circuit further includes a seventh resistor and an eighth resistor. The seventh resistor is located between the positive electrode P+ of the battery pack and the collector of the transistor Q2 , and the eighth resistor is located between the base of the transistor Q2 and the cathode of the diode D4 .

7. The BMS detection and wake-up combination circuit according to any one of claims 1 to 6, characterized in that: It also includes a first resistor and a second resistor, the first resistor is arranged between the wake-up signal status detection port and the negative electrode B- of the battery, and the second resistor is arranged between the wake-up signal status detection port and the first node, and the resistance of the first resistor is greater than the resistance of the second resistor.

8. The BMS detection and wake-up combination circuit according to any one of claims 1 to 6, characterized in that: A third resistor is further included, and the third resistor is arranged between the power supply and the first node.

9. The BMS detection and wake-up combination circuit according to any one of claims 1 to 6, characterized in that: A capacitor is also included, one end of the capacitor is connected to the second node, and the other end is connected to the negative electrode B- of the battery.

10. A BMS wake-up system, characterized in that: The device comprises a BMS and a BMS detection and wake-up combination circuit according to any one of claims 1 to 9, wherein the BMS detection and wake-up combination circuit comprises a wake-up signal status detection port, and the BMS comprises a control center connected to the wake-up signal status detection port, and the control center is configured to wake up the BMS when a level change is detected at the wake-up signal status detection port.

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