CN-121984176-A - Accompanying charging method and circuit of power-deficiency energy storage unit and low-energy-consumption equipment

Abstract

The invention discloses a companion charging method, a circuit and low-energy consumption equipment of a power-shortage energy storage unit, and aims to solve the problem that charging is easily interrupted due to small trickle current when a mobile power supply for a small-capacity lithium battery is charged. The method comprises the steps of responding to a power supply signal of the mobile power supply, controlling the dummy load to be connected into a power supply loop, and enabling the power supply current to be larger than the lowest shutdown threshold of the mobile power supply at least in the phase of precharging the energy storage unit. The circuit comprises a power port, a battery protection board, an energy storage unit and the dummy load. The invention coordinates the safety mechanism of the mobile power supply and the battery management system, realizes the stable charging of the battery with insufficient power, and is suitable for equipment such as intelligent locks, earphones and the like.

Inventors

• CHEN JIAN
• Mo Lvcheng

Assignees

• 中山市元智科技有限公司

Dates

Publication Date

20260505

Application Date

20251223

Claims (10)

1. 1. The accompanying charging method of the low-energy consumption equipment for the power-deficiency energy storage unit is characterized in that a dummy load is also connected into the power supply signal to consume electric energy, and at least in the pre-charging stage of the energy storage unit, the dummy load accompanies the energy storage unit to consume electric energy, so that the power supply current value of the power supply signal is larger than the lowest shutdown threshold current of the mobile power supply.
2. 2. The companion charging method of claim 1 wherein the dummy load is controlled to continue to accompany the charging of the energy storage unit until the charging is completed.
3. 3. The companion charging method according to claim 1 or 2, wherein a power supply current value of the power supply signal or a charging current value of the energy storage unit is detected to obtain a detection signal, and a current consumption value of the dummy load is regulated in response to the magnitude of the detection signal, so that the current consumption value of the dummy load and the magnitude of the power supply current value are in negative correlation.
4. 4. The companion charging method of claim 3 wherein the current consumption value of the dummy load is adjusted in response to the magnitude of the supply current value such that the supply current value is between a lowest shutdown threshold current and a highest shutdown threshold current of the mobile power supply.
5. 5. The accompanying charging circuit of the low-energy consumption equipment power-shortage energy storage unit comprises a power port, a battery protection board and an energy storage unit, wherein the power port is used for receiving a power supply signal provided by an external mobile power supply, the battery protection board is electrically connected to the power port and used for controlling the charging and discharging processes of the power-shortage energy storage unit, and the accompanying charging circuit is characterized by further comprising a dummy load electrically connected to the power port and used for consuming part of electric energy in the power supply signal, and the dummy load is configured to accompany the energy storage unit to work at least in the pre-charging stage of the energy storage unit so that the power supply current value of the power supply signal is larger than the lowest shutdown threshold current of the mobile power supply.
6. 6. The companion charging circuit of claim 5 further comprising a companion manager for controlling operation of the dummy load, the companion manager configured to regulate a current consumption value of the dummy load such that the current consumption value of the dummy load is inversely related to the magnitude of the supply current value.
7. 7. The companion charging circuit of claim 6, further comprising a current detector for detecting a supply current value of the supply signal or a charging current value of the energy storage unit, and transmitting a detection signal to the companion manager, the companion manager regulating a current consumption value of the dummy load based on the detection signal.
8. 8. The companion charging circuit of any one of claims 5-7, wherein the dummy load is spatially isolated from the energy storage unit, the dummy load being any one of a resistive load, a transistor load, a speaker, a small heating element, a micro fan, or a vibration motor.
9. 9. The accompanying charging circuit according to any one of claims 5 to 7, wherein the battery protection board and the energy storage unit are arranged in any one of a first mode in which they are integrally disposed in the same housing unit to form a replaceable battery, the battery is provided with two conductive electrodes electrically connected to the battery protection board and the energy storage unit, respectively, and the battery is detachably electrically connected to the power supply port through the two conductive electrodes, and a second mode in which they are separately disposed at different portions of the low-power consumption device and are electrically connected to the power supply port, respectively.
10. 10. A low energy consumption device comprising the companion charging circuit of any one of claims 5 to 9, and further comprising an electrical unit electrically connected to the power port for receiving a power signal provided by the mobile power supply or electrical energy released by the energy storage unit.

Description

Accompanying charging method and circuit of power-deficiency energy storage unit and low-energy-consumption equipment Technical Field The invention relates to low-energy consumption equipment and a charge-discharge management circuit thereof, in particular to a companion charging method and a charging circuit for a low-capacity energy storage lithium battery core with power deficiency and low-energy consumption equipment adopting the same. Background Existing low-energy consumption devices, such as smart locks, watches, electronic scales, headphones, wearable devices, sensors of the internet of things, and the like, are based on the advantages of good safety performance, environmental protection, high energy density, and the like, whether they are mobile or fixedly installed on a building, and all adopt a large amount of rechargeable and dischargeable small-capacity lithium batteries (the battery capacity is generally not more than 1000 mAh). The lithium Battery comprises a lithium Battery core and a Battery management system BMS (Battery MANAGEMENT SYSTEM, commonly called Battery protection board), which is an intelligent system integrated with hardware (protection IC, MOS tube and the like) and software algorithm, and is used for monitoring and controlling charge and discharge parameters (voltage, current, temperature and the like) of the energy storage unit, ensuring the charge and discharge of the energy storage unit in a safe range and prolonging the service life of the Battery. In the charging process of the small-capacity lithium battery in the state of power shortage, a three-stage charging management strategy is generally adopted, namely a pre-charging stage, a large-current (constant-current charging) stage and a constant-voltage charging stage. The pre-charging stage accounts for 5% -10% of the total charging time, and the pre-charging stage has the function of slowly activating the battery, avoiding large current from impacting the electrode structure of the battery without the power supply, and protecting the service life of the battery. The charging current in the precharge phase is generally controlled to be about 5-30 mA in the last constant voltage charging phase, and is commonly called trickle charging. In addition, the working energy consumption of the low-energy-consumption equipment in a standby state is very small, and the current of the standby working energy consumption and the trickle charging energy consumption is generally accumulated to be not more than 30-80 mA. The current charging modes of the low-energy-consumption equipment mainly comprise two modes of charging by a plug-in charger and charging by a mobile charger. The mobile charger is generally set with a minimum output current threshold value less than or equal to 100 mA for safety management, and is considered as an idle state when detecting that the charging current is less than the minimum threshold current, and is automatically powered off after a delay time of 10-120 s. (for example, the minimum shutdown threshold current published and set by the official of the millet charger is less than or equal to 80mA, the time delay is 90s, and the minimum shutdown threshold current of the millet charger is less than or equal to 50-60 mA, and the time delay is 120 s). Secondly, the mobile charger baby is also provided with a highest output current threshold value, and when the output current is found to be too large to reach the highest current threshold value, the mobile charger baby is also automatically powered off or automatically subjected to current limiting protection. If the mobile charger is used for charging the small-capacity lithium battery in a state of power shortage, the electric energy (charging consumption or charging consumption+equipment standby consumption) consumed in the trickle charging stage is far lower than the lowest shutdown threshold current of the mobile charger, so that the charger is misjudged to be idle and automatically shut down, and people often find that the charging is very difficult, even always, or the charging is difficult to be full. For example, when the intelligent door lock powered by the lithium battery is powered off and then a user charges by using a portable charger, the user is often difficult to charge due to the reasons, and the use experience of the user is seriously affected. Disclosure of Invention For the trickle charging difficulty presented when a small-capacity lithium battery in a power shortage state is charged by using a mobile charger, particularly the technical problem that the charger misjudges no-load shutdown and charge interruption due to the fact that trickle charging current is too small in a pre-charging stage, the inventor researches and discovers that the problem is caused by incompatibility between respective safety protection mechanisms of a Battery Management System (BMS) of the charger and a low-energy consumption device, and can solve the problem if a