Low-power-consumption wake-up circuit for automatic load detection of lithium battery pack

By designing a low-power wake-up circuit for automatic load detection of lithium battery packs, the microfluidic source module and mirror module detect the load state and wake up the BMS module to power supply, the low-power management problem of lithium battery packs in the dormant state is solved, and reliable detection of load state and low-power power supply is achieved.

CN223296294UActive Publication Date: 2025-09-02SHENZHEN GAOKERUN ELECTRONICS CO LTD +1
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Patent Information

Application Number
CN202422641749.6
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-10-31
Publication Date
2025-09-02
Estimated Expiration
2034-10-31

AI Technical Summary

Technical Problem

Lithium battery packs are difficult to achieve low power consumption management in a dormant state, especially the lack of automatic load detection mechanism, which leads to an increase in the demand for external wake-up signals.

Method used

Design a low-power wake-up circuit for automatic load detection of lithium battery packs, including microfluidic source module, mirror module, wake-up module and BMS module, to detect the load state through micro current and wake up the BMS power supply.

Benefits of technology

It realizes reliable detection of load state, simple peripheral circuit, standby leakage current is less than 10uA, meeting the requirements of long-term low power consumption.

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Abstract

The utility model discloses a low power consumption wake-up circuit for automatic load detection of a lithium battery pack, and relates to the field of lithium batteries, the low power consumption wake-up circuit for automatic load detection of the lithium battery pack comprises a micro-flow source module used for allowing current to flow through and micro-current to be 10 uA at maximum when a load is not connected and allowing micro-current to flow through and micro-current to be 20 uA at maximum when the load is connected; the mirroring module is used for mirroring with the micro-flow source module, the flowing current is the same as that of the micro-flow source module, and a feedback signal is sent to the awakening module; the awakening module is used for awakening the BMS module after receiving the feedback signal; the BMS module is used for supplying power to a load after awakening work; compared with the prior art, the beneficial effects of the utility model are that the device can effectively and reliably detect the disconnection and connection states of the load of the battery pack; a peripheral circuit is very simple; detecting standby leakage current lt of the circuit; the long-time standby requirement of the lithium battery can be fully met, and the power consumption is low.
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Description

Technical Field

[0001] The utility model relates to the field of lithium batteries, in particular to a low-power wake-up circuit for automatic load detection of a lithium battery pack. Background Art

[0002] Lithium-ion batteries are widely used in mobile phones, laptops, mobile power supplies, home appliances, electric vehicles and energy storage fields due to their advantages such as high energy density, long cycle life and no memory effect.

[0003] Since general lithium battery packs (the process of connecting multiple lithium battery cells in series, parallel, etc., and supplemented by BMS, connectors, wiring harnesses, casings, cooling systems, and safety protection devices to form a complete battery system) require BMS (battery management system) to complete lithium battery-related protection functions.

[0004] When the BMS is working, the current generally exceeds the mA level. If the sleep mode is used, then an external wake-up signal is required for the pack connected to the load to exit the sleep mode, which usually requires an external button. If the connected load does not have a related button, it is difficult to achieve low power consumption by using the sleep mode, which needs to be improved. Utility Model Content

[0005] The purpose of the present invention is to provide a low-power wake-up circuit for automatic load detection of a lithium battery pack, so as to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above objectives, the present invention provides the following technical solutions:

[0007] A low-power wake-up circuit for automatic load detection of a lithium battery pack, comprising:

[0008] The microcurrent source module is used to allow current to flow when the load is not connected. The maximum microcurrent is 10uA. When the load is connected, the microcurrent flows, and the maximum microcurrent is 20uA.

[0009] The mirror module is used to mirror the microcurrent source module, the current flowing through the module is the same as that of the microcurrent source module, and a feedback signal is sent to the wake-up module;

[0010] The wake-up module is used to wake up the BMS module after receiving the feedback signal;

[0011] BMS module is used to power the load after waking up;

[0012] The micro-flow source module is connected to the mirror module, the mirror module is connected to the wake-up module, and the wake-up module is connected to the BMS module.

[0013] As a further solution of the present invention: the micro-current source module includes a resistor R2, a transistor Q1, and a resistor R4, one end of the resistor R2 is connected to the positive electrode BAT+ of the battery, the other end of the resistor R2 is connected to the emitter of the transistor Q1, the base of the transistor Q1 is connected to the mirror module, the collector of the transistor Q1, and one end of the resistor R4, and the other end of the resistor R4 is connected to the load.

[0014] As a further solution of the present invention: the mirror module includes a resistor R1, a transistor Q2, and a resistor R3. One end of the resistor R1 is connected to the positive electrode BAT+ of the battery, the other end of the resistor R1 is connected to the emitter of the transistor Q2, the base of the transistor Q2 is connected to the microcurrent source module, the collector of the transistor Q2 is connected to one end of the resistor R3 and the wake-up module, and the other end of the resistor R3 is grounded.

[0015] As a further solution of the present invention: the wake-up module includes a MOS tube Q3 and a resistor R5, one end of the resistor R5 is connected to the voltage VCC, the other end of the resistor R5 is connected to the D pole of the MOS tube Q3 and the BMS module, the S pole of the MOS tube Q3 is grounded, and the G pole of the MOS tube Q3 is connected to the mirror module.

[0016] As a further solution of the present invention: the BMS module includes a BMS management IC and a MOS tube Q4. The first end of the BMS management IC is connected to the voltage VCC, the second end of the BMS management IC is connected to the G pole of the MOS tube Q4, the S pole of the MOS tube Q4 is connected to the battery BAT+, the D pole of the MOS tube Q4 is connected to the positive pole CN1 of the battery pack, the third end of the BMS management IC is connected to the wake-up module, the fourth end of the BMS management IC is connected to one end of the resistor R6 and the negative pole CN2 of the battery pack, and the other end of the resistor R6 is grounded.

[0017] Compared with the existing technology, the beneficial effects of the present invention are: the present invention can effectively and reliably detect the disconnection and connection status of the battery pack load; the peripheral circuit is very simple; the standby leakage current of the detection circuit is <10uA, which can fully meet the long-term standby requirements of the lithium battery and has low power consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The circuit diagram is a low-power wake-up circuit for automatic load detection of a lithium battery pack. DETAILED DESCRIPTION

[0019] 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 part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0020] See also Figure 1 , a low-power wake-up circuit for automatic detection of lithium battery pack load, comprising:

[0021] The microcurrent source module is used to allow current to flow when the load is not connected. The maximum microcurrent is 10uA. When the load is connected, the microcurrent flows, and the maximum microcurrent is 20uA.

[0022] The mirror module is used to mirror the microcurrent source module, the current flowing through the module is the same as that of the microcurrent source module, and a feedback signal is sent to the wake-up module;

[0023] The wake-up module is used to wake up the BMS module after receiving the feedback signal;

[0024] BMS module is used to power the load after waking up;

[0025] The micro-flow source module is connected to the mirror module, the mirror module is connected to the wake-up module, and the wake-up module is connected to the BMS module.

[0026] In this example: See Figure 1 The micro-current source module includes a resistor R2, a transistor Q1, and a resistor R4. One end of the resistor R2 is connected to the positive electrode BAT+ of the battery, the other end of the resistor R2 is connected to the emitter of the transistor Q1, the base of the transistor Q1 is connected to the mirror module, the collector of the transistor Q1, and one end of the resistor R4. The other end of the resistor R4 is connected to the load.

[0027] When the battery pack positive electrode CN1 and the battery pack negative electrode CN2 are not connected to a load, the maximum microcurrent when the transistor Q1 is turned on is 10uA. After the load is connected, the battery positive electrode BAT+, resistor R2, transistor Q1, resistor R4, load, and battery negative electrode BAT- (also serving as a common ground) form a loop. Current flows through the transistor Q1, and the magnitude of the current is adjusted by resistors R2, R4, and the load impedance. The design ensures that the maximum current does not exceed 20uA when there is a load.

[0028] In this example: See Figure 1 The mirror module includes a resistor R1, a transistor Q2, and a resistor R3. One end of the resistor R1 is connected to the positive electrode BAT+ of the battery, the other end of the resistor R1 is connected to the emitter of the transistor Q2, the base of the transistor Q2 is connected to the micro-current source module, the collector of the transistor Q2 is connected to one end of the resistor R3 and the wake-up module, and the other end of the resistor R3 is grounded.

[0029] The current flowing through transistor Q2 is the same as that of transistor Q1. After the load is connected, the voltage drop formed by the current flowing through transistor Q2 on resistor R3 is large enough to ensure that the wake-up module can be driven.

[0030] In this example: See Figure 1The wake-up module includes a MOS tube Q3 and a resistor R5. One end of the resistor R5 is connected to the voltage VCC, the other end of the resistor R5 is connected to the D pole of the MOS tube Q3 and the BMS module, the S pole of the MOS tube Q3 is grounded, and the G pole of the MOS tube Q3 is connected to the mirror module.

[0031] When the voltage drop on the resistor R3 is small, the MOS tube Q3 is cut off and outputs a high level to the BMS module. When the voltage drop on the resistor R3 is large, the MOS tube Q3 is turned on and outputs a low level to the BMS module.

[0032] In this example: See Figure 1 The BMS module includes a BMS management IC and a MOS tube Q4. The first end of the BMS management IC is connected to the voltage VCC, the second end of the BMS management IC is connected to the G pole of the MOS tube Q4, the S pole of the MOS tube Q4 is connected to the battery BAT+, the D pole of the MOS tube Q4 is connected to the battery pack positive electrode CN1, the third end of the BMS management IC is connected to the wake-up module, the fourth end of the BMS management IC is connected to one end of the resistor R6 and the battery pack negative electrode CN2, and the other end of the resistor R6 is grounded.

[0033] When a low level is received, the BMS management IC (existing technology) drives the MOS tube Q4 to turn on, so that the battery positive electrode BAT+, MOS tube Q4, load, resistor R6, and battery negative electrode BAT- form a loop, and the battery supplies power to the load.

[0034] The working principle of the present invention is as follows: the microcurrent source module is used to allow current to flow through when the load is not connected, and the maximum microcurrent is 10uA; when the load is connected, the microcurrent flows through, and the maximum microcurrent is 20uA; the mirror module is used to mirror the microcurrent source module, and the current flowing through the microcurrent source module is the same as that of the microcurrent source module, and sends a feedback signal to the wake-up module; the wake-up module is used to wake up the BMS module after receiving the feedback signal; the BMS module is used to power the load after the wake-up operation.

[0035] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered in all respects as exemplary and non-restrictive.

[0036] 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 sake of clarity. 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.

Claims

1. A low-power wake-up circuit for automatic load detection of a lithium battery pack, characterized in that: The low-power wake-up circuit for automatic detection of lithium battery pack load includes: The microcurrent source module is used to allow current to flow when the load is not connected. The maximum microcurrent is 10uA. When the load is connected, the microcurrent flows, and the maximum microcurrent is 20uA. The mirror module is used to mirror the microcurrent source module, the current flowing through the module is the same as that of the microcurrent source module, and a feedback signal is sent to the wake-up module; The wake-up module is used to wake up the BMS module after receiving the feedback signal; BMS module is used to power the load after waking up; The micro-flow source module is connected to the mirror module, the mirror module is connected to the wake-up module, and the wake-up module is connected to the BMS module.

2. The low-power wake-up circuit for automatic load detection of a lithium battery pack according to claim 1, characterized in that: The microcurrent source module includes a resistor R2, a transistor Q1, and a resistor R4. One end of the resistor R2 is connected to the positive electrode BAT+ of the battery, the other end of the resistor R2 is connected to the emitter of the transistor Q1, the base of the transistor Q1 is connected to the mirror module, the collector of the transistor Q1, and one end of the resistor R4. The other end of the resistor R4 is connected to the load.

3. The low-power wake-up circuit for automatic load detection of a lithium battery pack according to claim 2, characterized in that: The mirror module includes a resistor R1, a transistor Q2, and a resistor R3. One end of the resistor R1 is connected to the positive electrode BAT+ of the battery, the other end of the resistor R1 is connected to the emitter of the transistor Q2, the base of the transistor Q2 is connected to the microcurrent source module, the collector of the transistor Q2 is connected to one end of the resistor R3 and the wake-up module, and the other end of the resistor R3 is grounded.

4. The low-power wake-up circuit for automatic load detection of a lithium battery pack according to claim 1, characterized in that: The wake-up module includes a MOS tube Q3 and a resistor R5. One end of the resistor R5 is connected to the voltage VCC, the other end of the resistor R5 is connected to the D pole of the MOS tube Q3 and the BMS module, the S pole of the MOS tube Q3 is grounded, and the G pole of the MOS tube Q3 is connected to the mirror module.

5. The low-power wake-up circuit for automatic load detection of a lithium battery pack according to claim 1, characterized in that: The BMS module includes a BMS management IC and a MOS tube Q4. The first end of the BMS management IC is connected to the voltage VCC, the second end of the BMS management IC is connected to the G pole of the MOS tube Q4, the S pole of the MOS tube Q4 is connected to the battery BAT+, the D pole of the MOS tube Q4 is connected to the positive pole CN1 of the battery pack, the third end of the BMS management IC is connected to the wake-up module, the fourth end of the BMS management IC is connected to one end of the resistor R6 and the negative pole CN2 of the battery pack, and the other end of the resistor R6 is grounded.