Starting-up circuit of BMS (Battery Management System) and mobile electric equipment

Abstract

The invention discloses a startup circuit of a BMS (Battery Management System) and mobile electric equipment. The power-on circuit of the BMS comprises a first switch module connected between a battery pack and a load; the voltage regulating module, the first switch module and the load are connected to a first node; the voltage regulating module is used for reducing the first voltage of the first node and outputting a second voltage during power-on; the second switch module is connected between the control module and the grounding end, the control end of the second switch module is connected with the voltage regulating module, and the second switch module is conducted according to the second voltage and outputs a first level signal; the awakening end of the control module is connected with the second switch module, and is used for electrifying according to the first level signal and generating a first control signal; and the control module is connected with the control end of the first switch module and is used for electrifying and starting up the BMS when the control module is switched on according to the first control signal. According to the technical scheme provided by the embodiment of the invention, the BMS can be quickly started and powered on from the shutdown state, and the power consumption of the BMS can be reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of power supply circuits, and particularly to a power-on circuit of a BMS and a mobile power consumption device. Background Art

[0002] With the rapid development of portable energy storage application technology, the Battery Management System (BMS) has been widely used. The battery management system has the characteristics of preventing overcharging and over-discharging, improving battery utilization rate, and extending the service life of the battery. The battery management system can monitor various parameters of the battery in real time and provide real-time feedback on the battery status.

[0003] The existing control circuit of the BMS has a relatively high static power consumption. When the BMS is not started, the existing power-on circuit is prone to cause additional losses, affecting the battery life. Summary of the Invention

[0004] The present invention provides a power-on circuit of a BMS and a mobile power consumption device to solve the problem that the existing control circuit of the BMS has a relatively high static power consumption. When the BMS is not started, the existing power-on circuit is prone to cause additional losses, affecting the battery life.

[0005] According to an aspect of the present invention, there is provided a power-on circuit of a BMS, including:

[0006] A first switch module, the first switch module being connected between a battery pack and a load;

[0007] A voltage regulation module, the voltage regulation module being connected to the first switch module and the load at a first node; the voltage regulation module is configured to step down a first voltage at the first node and output a second voltage when powered on;

[0008] A second switch module, connected between a control module and a ground terminal, a control end of the second switch module being connected to the voltage regulation module, the second switch module being configured to conduct according to the second voltage and output a first level signal;

[0009] A control module, a wake-up end of the control module being connected to the second switch module, the control module being configured to power on according to the first level signal and generate a first control signal;

[0010] The control module is connected to a control end of the first switch module, and when the first switch module is configured to conduct according to the first control signal, the BMS powers on and boots up.

[0011] Optionally, the voltage regulation module includes: a voltage division network and a switching component;

[0012] The first end of the voltage dividing network is connected to the first node, the second end of the voltage dividing network is connected to the first end of the switching component, the third end of the voltage dividing network is connected to the second end of the switching component, the fourth end of the voltage dividing network is connected to the control end of the second switching module, and the fifth end of the voltage dividing network is connected to the ground end;

[0013] The switching component is used to conduct or disconnect according to user requirements;

[0014] The voltage dividing network is used to divide the voltage of the first node when the switching component is conducting, output a second voltage, and stop outputting the second voltage when the switching component is disconnected.

[0015] Optionally, the voltage dividing network includes:

[0016] A first resistor, a second resistor, and a third resistor;

[0017] The first resistor is connected between the first node and the first end of the switching component, the second resistor is connected between the second end of the switching component and the control end of the second switching module, the third resistor is connected between the control end of the second switching module and the first end of the second switching module, and the third resistor and the first end of the second switching module are connected to the ground end.

[0018] Optionally, the control module includes:

[0019] A BMS and a controller. The wake-up end of the BMS is connected to the second end of the second switching module, and the control signal output end of the BMS is connected to the control end of the first switching module; the BMS is used to generate a first control signal according to the first level signal at the wake-up end;

[0020] The controller is connected to the BMS, and the controller is used to power on according to the first control signal.

[0021] Optionally, the second switching module includes:

[0022] A first transistor. The first pole of the first transistor is connected to the ground end, the second pole of the first transistor is connected to the wake-up end of the control module, and the gate of the first transistor is connected to the output end of the voltage regulating module;

[0023] When powering on from the shutdown state, the first transistor is used to conduct according to the second voltage, the wake-up end of the control module receives the first level signal and is woken up, generates a first control signal, and when the first switching module is used to conduct according to the first control signal, the BMS powers on and boots up.

[0024] Optionally, the first switch module includes:

[0025] A second transistor, which is connected between the first node and the second pole of the battery pack, and the second pole of the battery pack is connected to the ground terminal. The second transistor is used to conduct according to the first control signal.

[0026] Optionally, the first switch module further includes:

[0027] A third transistor, the first pole of the third transistor is connected to the second pole of the second transistor, and the second pole of the third transistor is connected to the second pole of the battery pack and the ground terminal. The third transistor is used to conduct according to the first control signal;

[0028] When both the third transistor and the second transistor are conducting, the battery pack is used to supply power to the load; when the third transistor is turned off, the battery pack stops supplying power to the load.

[0029] Optionally, the switching component includes:

[0030] At least one of a power switch, a button, a contactor or a relay.

[0031] Optionally, the first transistor, the second transistor and the third transistor all include field effect transistors.

[0032] According to another aspect of the present invention, this embodiment provides a mobile electrical device, including: the power-on circuit of the BMS proposed in any item of the first aspect.

[0033] The technical solution of the embodiment of the present invention controls the conduction or cut-off of the second switch module through the voltage regulation module. When the second switch module is conducting, the second switch module transmits a first level signal to the wake-up terminal WAKE_UP of the control module, so that the control module is awakened, controls the first switch module to conduct, and the battery pack supplies power to the load through the conducting first switch module, so that the circuit enters the power-on state. The control module controls the first switch module to turn off, and the battery pack does not supply power to the load, so that the BMS enters the shutdown state. The technical solution of the embodiment of the present invention enables the power-on circuit of the BMS to conveniently switch between the power-on state and the shutdown state, so that the circuit where the BMS is located can be in the standby state when not working, thereby better improving the static power loss of the circuit where the BMS is located. When the BMS is not started, the power-on circuit of the BMS provided in this embodiment will not cause additional losses, thereby improving the battery life of the battery pack and improving the user experience.

[0034] It should be understood that the content described in this part is not intended to identify the key or important features of the embodiments of the present invention, nor is it used to limit the scope of the present invention. Other features of the present invention will become easily understandable through the following description. Brief Description of the Drawings

[0035] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for use in the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0036] Figure 1 It is a schematic structural diagram of a power-on circuit of a BMS provided by an embodiment of the present invention;

[0037] Figure 2 It is a schematic structural diagram of another power-on circuit of a BMS provided by an embodiment of the present invention;

[0038] Figure 3 It is a schematic structural diagram of yet another power-on circuit of a BMS provided by an embodiment of the present invention;

[0039] Figure 4 It is a schematic structural diagram of yet another power-on circuit of a BMS provided by an embodiment of the present invention. Detailed Embodiments

[0040] In order to enable those skilled in the art to better understand the solutions of the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0041] It should be noted that the terms "first", "second", etc. in the description and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and do not necessarily need to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products, or devices.

[0042] Figure 1 The structural schematic diagram of a power-on circuit of a BMS provided by an embodiment of the present invention is shown in Figure 1 . The power-on circuit of the BMS provided in this embodiment includes a first switch module 1, and the first switch module 1 is connected between a battery pack 10 and a load 20; a voltage regulating module 2, the voltage regulating module 2 is connected to the first switch module 1 and the load 20 at a first node; the voltage regulating module 2 is configured to step down the first voltage at the first node during power-on and output a second voltage; a second switch module 3, connected between a control module 5 and a ground terminal, a control end of the second switch module 3 is connected to the voltage regulating module 2, and the second switch module 3 is configured to conduct according to the second voltage and output a first level signal; a control module 5, a wake-up end WAKE_UP of the control module 5 is connected to the second switch module 3, and the control module 5 is configured to power on according to the first level signal and generate a first control signal; the control module 5 is connected to a control end of the first switch module 1, and when the first switch module 1 is configured to conduct according to the first control signal, the BMS powers on and boots up.

[0043] Specifically, in the shutdown state, the control module 5 is in a low-power state. When switching from the shutdown state to the power-on state, it is necessary to wake up the control module 5 by inputting a first level signal to the wake-up end WAKE_UP of the control module 5.

[0044] In the shutdown state, the first switch module 1 is in an open state, and the battery pack 10 does not supply power externally. At this time, the first node P- is connected to the first pole B+ of the battery pack 10 through the load 20. The first node P- has the voltage of the battery pack 10 relative to the reference ground terminal inside the BMS.

[0045] Through the voltage regulating module 2, the voltage of the first node P- is divided and stepped down to output a second voltage. The second voltage is less than the first voltage of the first node P-. When the control end of the second switch module 3 conducts according to the received second voltage, the wake-up end WAKE_UP of the control module 5 is pulled low, and the first level signal is, for example, a low level. When the first level signal is input to the wake-up end WAKE_UP of the control module 5, the control module 5 is woken up. The control module 5 generates a first control signal. The first control signal can be a high level signal or a low level signal.

[0046] The control end of the control module 5 receives the first control signal. When the first control signal received by the control module 5, for example, a high level signal, the first switch module 1 conducts. The battery pack 10 supplies power to the load 20 through the conducting first switch module 1, enabling the BMS to enter the power-on state.

[0047] The power-on circuit of the BMS provided in this embodiment controls the conduction or cut-off of the second switch module 3 through the voltage regulation module 2. When the second switch module 3 is conducting, the second switch module 3 transmits a first-level signal to the wake-up terminal WAKE_UP of the control module 5, so that the control module 5 is woken up, controls the first switch module 1 to conduct, and the battery pack 10 supplies power to the load 20 through the conducting first switch module 1, so that the circuit enters the power-on state. Such a setting enables the power-on circuit of the BMS to conveniently switch between the power-on state and the power-off state, so that the circuit where the BMS is located can be in the standby state when not working, thereby better improving the static power loss of the circuit where the BMS is located. When the BMS is not started, the power-on circuit of the BMS provided in this embodiment will not cause additional loss, thereby improving the battery life of the battery pack and improving the user experience.

[0048] Optionally, Figure 2 is a schematic structural diagram of another power-on circuit of the BMS provided in an embodiment of the present invention. On the basis of the above embodiments, refer to Figure 2 , the voltage regulation module 2 may include a voltage division network 21 and a switch component 22; the first end of the voltage division network 21 is connected to the first node P-, the second end of the voltage division network 21 is connected to the first end of the switch component 22, the third end of the voltage division network 21 is connected to the second end of the switch component 22, the fourth end of the voltage division network 21 is connected to the control end of the second switch module 3, and the fifth end of the voltage division network 21 is connected to the ground end; the switch component 22 is used to conduct or disconnect according to user needs; the voltage division network 21 is used to divide the voltage of the first node P- when the switch component 22 is conducting, output a second voltage, and stop outputting the second voltage when the switch component 22 is disconnected.

[0049] Specifically, the switch component 22 may be a manual switch or an electric switch, such as a key switch or a button switch, etc., and no limitation is made here. When the switch component 22 is used to conduct according to user needs, power-on is about to be performed. When the switch component 22 is used to disconnect according to user needs, power-off is about to be performed.

[0050] The voltage division network 21 divides the voltage of the first node P- when the switch component 22 is conducting, outputs a second voltage, and stops outputting the second voltage when the switch component 22 is disconnected. Such a setting facilitates stepping down the first voltage of the first node P- to the second voltage required by the second switch module 3, avoiding overvoltage damage to the second switch module 3, and improving the reliability of the power-on circuit of the BMS.

[0051] Optionally, on the basis of the above embodiments, continue to refer to Figure 2, the voltage dividing network 21 may include: a first resistor R1, a second resistor R2, and a third resistor R3; the first resistor R1 is connected between the first node P- and the first end of the switch component 22, the second resistor R2 is connected between the second end of the switch component 22 and the control end of the second switch module 3, the third resistor R3 is connected between the control end of the second switch module 3 and the first end of the second switch module 3, and the third resistor R3 and the first end of the second switch module 3 are connected to the ground terminal.

[0052] Specifically, the resistance values of the first resistor R1, the second resistor R2, and the third resistor R3 can be set as needed and can be set to be the same or different.

[0053] Optionally, based on the above embodiments, continue to refer to Figure 2 , the control module 5 may include: a BMS and a controller. The wake-up terminal WAKE_UP of the BMS is connected to the second end of the second switch module 3, and the control signal output terminal of the BMS is connected to the control end of the first switch module 1; the BMS is used to generate a first control signal according to the first level signal of the wake-up terminal WAKE_UP; the controller is connected to the BMS, and the controller is used to power on according to the first control signal.

[0054] Specifically, the BMS is a battery management system. The BMS is used to collect information such as the voltage, current, and temperature of the battery pack 10. The controller is connected to the BMS, and the controller can be connected to the motor. The controller controls the motor according to the parameters output by the BMS.

[0055] Optionally, Figure 3 is a schematic structural diagram of another BMS power-on circuit provided by an embodiment of the present invention. Based on the above embodiments, refer to Figure 3 , the second switch module 3 may include: a first transistor Q3. The first pole of the first transistor Q3 is connected to the ground terminal, the second pole of the first transistor Q3 is connected to the wake-up terminal WAKE_UP of the control module 5, and the gate of the first transistor Q3 is connected to the output terminal of the voltage regulating module 2; when powering on from the shutdown state, the first transistor Q3 is used to conduct according to the second voltage, the wake-up terminal WAKE_UP of the control module 5 receives the first level signal and is awakened, and a first control signal is generated. When the first switch module 1 is used to conduct according to the first control signal, the BMS powers on and boots up.

[0056] Specifically, the first transistor Q3 may be an N-type field effect transistor. If the first switch module 1 cannot receive the first control signal, the connection between the battery pack 10 and the load 20 is disconnected, and the BMS powers off and shuts down.

[0057] When powering on from the shutdown state, the first transistor Q3 conducts according to the second voltage received at its gate. The wake-up terminal WAKE_UP of the control module 5 receives a first level signal, such as a low-level signal, and is woken up, and generates a first control signal. At this time, the first switch module 1 conducts according to the first control signal, and the BMS powers on.

[0058] Optionally, Figure 4 FIG. is a schematic structural diagram of another power-on circuit of the BMS provided by an embodiment of the present invention. On the basis of the above embodiments, refer to Figure 4 , the first switch module 1 may include: a second transistor Q1, the second transistor Q1 is connected between the first node P- and the second pole of the battery pack 10, the second pole of the battery pack 10 is connected to the ground terminal, and the second transistor Q1 is used to conduct according to the first control signal.

[0059] Specifically, the second transistor Q1 may be an N-type field effect transistor or a P-type field effect transistor. The type of the second transistor Q1 can be selected according to needs, and the first control signal output by the control module 5 is adaptively set to a second level signal or a first level signal.

[0060] Optionally, on the basis of the above embodiments, continue to refer to Figure 4 , the first switch module 1 may further include: a third transistor Q2, the first pole of the third transistor Q2 is connected to the second pole of the second transistor Q1, the second pole of the third transistor Q2 is connected to the second pole of the battery pack 10 and the ground terminal, and the third transistor Q2 is used to conduct according to the first control signal; when both the third transistor Q2 and the second transistor Q1 are conducting, the battery pack 10 is used to supply power to the load 20; when the third transistor Q2 is turned off, the battery pack 10 stops supplying power to the load 20.

[0061] Specifically, the third transistor Q2 may be an N-type field effect transistor or a P-type field effect transistor. The type of the third transistor Q2 can be selected according to needs, and the first control signal output by the control module 5 is adaptively set to a second level signal or a first level signal.

[0062] When it is set that when both the third transistor Q2 and the second transistor Q1 are conducting, the battery pack 10 is used to supply power to the load 20; when the third transistor Q2 is turned off, the battery pack 10 stops supplying power to the load 20, the reliability and safety of the battery pack 10 for charging and discharging are further improved.

[0063] It should be noted that, Figures 2 to 4 exemplarily shown is the case where when the first switch module 1 includes the second transistor Q1 and the third transistor Q2, the gate of the second transistor Q1 is connected to the first interface CHG of the control module, and the gate of the third transistor Q2 is connected to the second interface DSG of the control module, and no limitation is made here.

[0064] Optionally, based on the above embodiments, continue to refer to Figure 4 , the switching component 22 may include at least one of a power switch, a button, a contactor, or a relay.

[0065] It should be noted that Figures 2 to 4 exemplarily shows the case where the switching component 22 includes a power switch K1, and no limitation is made here.

[0066] Optionally, based on the above embodiments, continue to refer to Figure 4 , the first transistor Q3, the second transistor Q1, and the third transistor Q2 all include field effect transistors.

[0067] It should be noted that Figure 4 exemplarily shows the case where the load includes a resistive load Rload, and no limitation is made here.

[0068] This embodiment provides a mobile electrical device. The mobile electrical device provided in this embodiment includes the power-on circuit of the BMS proposed in any of the above embodiments, and has the beneficial effects of the power-on circuit of the BMS proposed in any of the above embodiments, which will not be elaborated here.

[0069] The above specific implementation manners do not constitute a limitation to the protection scope of the present invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A BMS startup circuit, characterized in that: include: A first switch module, wherein the first switch module is connected between the battery pack and the load; A voltage regulating module, wherein the voltage regulating module is connected to a first node with the first switch module and the load; the voltage regulating module is used to step down a first voltage of the first node and output a second voltage when powered on; A second switch module is connected between the control module and the ground terminal, the control terminal of the second switch module is connected to the voltage regulating module, and the second switch module is used to be turned on according to the second voltage and output a first level signal; A control module, wherein the wake-up end of the control module is connected to the second switch module, and the control module is used to power on according to the first level signal and generate a first control signal; The control module is connected to the control end of the first switch module, and the first switch module is used to power on the BMS when it is turned on according to the first control signal.

2. The BMS startup circuit according to claim 1, characterized in that: The voltage regulation module comprises: a voltage dividing network and a switch component; The first end of the voltage divider network is connected to the first node, the second end of the voltage divider network is connected to the first end of the switch component, the third end of the voltage divider network is connected to the second end of the switch component, the fourth end of the voltage divider network is connected to the control end of the second switch module, and the fifth end of the voltage divider network is connected to the ground end; The switch component is used to turn on or off according to user needs; The voltage divider network is used to divide the voltage of the first node to output a second voltage when the switch component is turned on, and stop outputting the second voltage when the switch component is turned off.

3. The BMS startup circuit according to claim 2, characterized in that: The voltage divider network comprises: a first resistor, a second resistor, and a third resistor; The first resistor is connected between the first node and the first end of the switch component, the second resistor is connected between the second end of the switch component and the control end of the second switch module, the third resistor is connected between the control end of the second switch module and the first end of the second switch module, and the third resistor and the first end of the second switch module are connected to the ground end.

4. The BMS startup circuit according to claim 1, characterized in that: The control module comprises: A BMS and a controller, wherein the wake-up end of the BMS is connected to the second end of the second switch module, and the control signal output end of the BMS is connected to the control end of the first switch module; the BMS is used to generate a first control signal according to the first level signal of the wake-up end; The controller is connected to the BMS, and is configured to be powered on according to the first control signal.

5. The BMS startup circuit according to claim 1, characterized in that: The second switch module comprises: a first transistor, wherein a first electrode of the first transistor is connected to the ground terminal, a second electrode of the first transistor is connected to the wake-up terminal of the control module, and a gate of the first transistor is connected to the output terminal of the voltage regulating module; When starting up from a shutdown state, the first transistor is used to be turned on according to the second voltage, the wake-up end of the control module receives the first level signal to be awakened, and generates a first control signal, and the first switch module is used to be turned on according to the first control signal, and the BMS is powered on.

6. The BMS startup circuit according to claim 5, characterized in that: The first switch module comprises: A second transistor, wherein the second transistor is connected between the first node and a second electrode of the battery pack, the second electrode of the battery pack is connected to a ground terminal, and the second transistor is configured to be turned on according to the first control signal.

7. The BMS startup circuit according to claim 6, characterized in that: The first switch module further includes: a third transistor, wherein a first electrode of the third transistor is connected to a second electrode of the second transistor, a second electrode of the third transistor is connected to a second electrode of the battery pack and a ground terminal, and the third transistor is configured to be turned on according to the first control signal; When the third transistor and the second transistor are both turned on, the battery pack is used to supply power to the load; when the third transistor is turned off, the battery pack stops supplying power to the load.

8. The BMS startup circuit according to claim 2, characterized in that: The switch component includes at least one of a power switch, a button, a contactor or a relay.

9. The BMS startup circuit according to claim 7, characterized in that: The first transistor, the second transistor, and the third transistor each include a field effect transistor.

10. A mobile electrical device, characterized in that: include: A power-on circuit for a BMS as claimed in any one of claims 1 to 9.

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