CN115395598A - Detachable lithium battery equipment power control management system - Google Patents

Detachable lithium battery equipment power control management system Download PDF

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Publication number
CN115395598A
CN115395598A CN202210867812.0A CN202210867812A CN115395598A CN 115395598 A CN115395598 A CN 115395598A CN 202210867812 A CN202210867812 A CN 202210867812A CN 115395598 A CN115395598 A CN 115395598A
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China
Prior art keywords
power supply
electrically connected
pin
resistor
switch unit
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Pending
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CN202210867812.0A
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Chinese (zh)
Inventor
付沈斌
周璇
徐兴锐
郑庆聪
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Guangzhou Guorui Scientific Instrument Co ltd
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Guangzhou Guorui Scientific Instrument Co ltd
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Priority to CN202210867812.0A priority Critical patent/CN115395598A/en
Publication of CN115395598A publication Critical patent/CN115395598A/en
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
    • H01M50/519—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing comprising printed circuit boards [PCB]
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/569—Constructional details of current conducting connections for detecting conditions inside cells or batteries, e.g. details of voltage sensing terminals
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H02J7/00304—Overcurrent protection
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H02J7/00306—Overdischarge protection
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H02J7/00308—Overvoltage protection
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H02J7/0031—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using battery or load disconnect circuits
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
    • H02J7/0048—Detection of remaining charge capacity or state of charge [SOC]
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/007—Regulation of charging or discharging current or voltage
    • H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
    • H02J7/00714—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery charging or discharging current
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/007—Regulation of charging or discharging current or voltage
    • H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
    • H02J7/007182—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery voltage
    • H02J7/007186—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery voltage obtained with the battery disconnected from the charge or discharge circuit
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
    • H01M2010/4271—Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The invention discloses a power control management system of a detachable lithium battery device, which comprises a power supply device and a power supply device, wherein the power supply device comprises a power supply unit and a power supply unit; the power supply equipment comprises an external power supply automatic switching circuit, a protection circuit, a power supply control circuit, a voltage detection circuit, a first controller and a first battery; the external power supply automatic switching circuit is electrically connected with the first battery; the first input end of the external power supply automatic switching circuit is electrically connected with the first battery, and the output end of the external power supply automatic switching circuit is electrically connected with the input end of the protection circuit; the output end of the protection circuit is electrically connected with the input end of the power supply control circuit; the output end of the power supply control circuit is used as the output end of the power supply equipment; according to the on-off signal input by the user, the high and low levels output by the first controller control the on-off of the power control circuit; the input end of the voltage detection circuit is electrically connected with the output end of the power supply control circuit, and the output end of the voltage detection circuit is electrically connected with the first controller.

Description

Detachable lithium battery equipment power control management system
Technical Field
The invention relates to the technical field of power management, in particular to a detachable lithium battery equipment power control management system.
Background
The lithium battery is a secondary battery which takes a lithium-containing compound as a positive electrode and realizes charge and discharge through the back-and-forth separation and the embedding of lithium ions between the positive electrode and the negative electrode of the battery in the charge and discharge process. The lithium ion battery is mainly composed of a positive electrode, a negative electrode, an electrolyte and a diaphragm. At present, the lithium battery is widely applied, but the following defects exist:
1. aging: unlike other rechargeable batteries, the capacity of lithium ion batteries slowly degrades, depending on the number of uses and also on the temperature. This degradation phenomenon can be expressed in terms of a decrease in capacity or an increase in internal resistance. Because of the temperature dependence, electronic products with high working current are easier to embody;
2. intolerance of overcharge, overdischarge: when overcharged, the excessively inserted lithium ions are permanently fixed in the crystal lattice and cannot be released any more, which may result in a short battery life. When overdischarged, the electrode deintercalates too many lithium ions, which may cause lattice collapse, thereby shortening the lifetime. Therefore, most lithium battery applications need to be prevented from being overcharged and overdischarged.
The common lithium batteries on the market at present mainly have 2 application modes:
1. the lithium batteries integrated with the battery protection board are different in shape and influenced by the structure size, most of the lithium batteries can only be used for products with specific structures, but when the capacity of the lithium batteries is aged, a user cannot easily find out the replacement of the batteries, and the replacement method is complex, so that the service lives of most of the products are limited by the service lives of the lithium batteries;
2. lithium batteries without integrated battery protection boards, such as common 14500 lithium batteries, 18650 lithium batteries, etc., which have fixed specification and size, are relatively easily purchased and disassembled on the market, but most of the lithium batteries lack overcharge and overdischarge protection, so that the service life of the batteries is shortened and even damaged easily due to overcharge and overdischarge, and meanwhile, for the detachable batteries, the anode and the cathode of the batteries are reversely connected due to misoperation or the contacts of the batteries are in contact with the outside to generate static electricity, which easily damages an internal circuit.
As shown in fig. 1, for a typical single lithium battery protection circuit, an OD controls discharge and an OC controls charge, overcurrent protection is generally generated when the battery is powered on for the first time, that is, the OD controls a MOS transistor M1 to be cut off, a relatively large voltage difference is formed between two ends of a D stage and an S stage of the MOS transistor M1, a short circuit is required to touch the D stage and the S stage of the MOS transistor M1 to reset a level to 0V, or the battery is connected to a charger, the charger is used for supplying power to a control circuit part of the protection circuit, the control part is powered on to work, and the battery can be activated for normal use. When the detachable battery is made, the battery protection circuit needs to be activated every time the battery is detached and then is installed again, the use is very troublesome, and if the protection circuit is integrated on a lithium battery, the structure size is difficult to be universal, and the detachable battery can only be made.
As shown in fig. 2, for a typical dual lithium battery series protection circuit, the battery protection circuit needs to be activated for the first use, and meanwhile, compared with a single lithium battery, only 2 lines of positive and negative electrodes need to be connected to the protection circuit, the dual lithium battery series connection needs to connect the positive and negative electrodes of 2 batteries to the protection circuit, that is, 1 line (a common end of 2 battery contacts) needs to be connected to the protection circuit more, for a part of detachable battery fixing structures, the common end of 2 battery contacts is in direct contact without being connected through other metal parts, and this structure is not convenient for adding a battery protection board.
For the non-detachable lithium battery, a battery protection circuit is integrated, for the equipment without a battery power self-locking switch, the power soft switch controlled by the MCU is mostly selected, namely, the power supply of the MCU is at least required to be kept normal, namely, after the production and packaging are finished, the equipment can continuously consume power, and the electric quantity of the battery is over half even consumed when a user purchases and uses the battery.
2 kinds of application methods that present lithium cell is commonly used, detachable and non-detachable, detachable leave the factory and do not install the battery, do benefit to the save of battery, nevertheless have and lack effectual battery protection circuit, user probably has abnormal factor such as overcharge, overdischarge, battery dress reversal, static during in-service use, leads to battery or equipment life to shorten even damage. For the undetachable and internal integrated protection circuit, the battery can be effectively protected, but a physical switch is not added to the battery for partial application, so that the battery continuously consumes power after being produced and packaged, the electric quantity of the battery is more lost or even the battery can not be directly started when a user just purchases the battery for use, meanwhile, the service life of most lithium battery equipment is limited by the service life of the battery because the battery is undetachable and not easy to replace, the capacity of the battery is also continuously reduced in the use process, and the user experience sense is continuously weakened.
Disclosure of Invention
The invention provides a detachable lithium battery equipment power supply control management system for solving the problems of the defects in the prior art.
In order to achieve the purpose of the invention, the technical scheme is as follows:
a power supply control management system of a detachable lithium battery device comprises a power supply device and a power supply device, wherein the power supply device is in communication connection with the power supply device, sends self electric quantity information to the power supply device, and provides power for the power supply device according to the electric quantity information;
the power supply equipment comprises an external power supply automatic switching circuit with electrostatic and reverse connection protection functions, a protection circuit with functions of power-on self-activation and voltage division detection of battery voltage, a power supply control circuit, a voltage detection circuit, a first controller and a first battery;
the external power supply automatic switching circuit is electrically connected with the first battery;
the first input end of the external power supply automatic switching circuit is electrically connected with the first battery, the output end of the external power supply automatic switching circuit is electrically connected with the input end of the protection circuit, and the power supply of the power supply equipment is output to the protection circuit;
the output end of the protection circuit is electrically connected with the input end of the power supply control circuit, and the protection circuit automatically enters a protection mode when the voltage is too low or too high and the current is over-discharged or over-charged;
the output end of the power supply control circuit is used as the output end of the power supply equipment;
according to the on-off signal input by the user, the high and low level output by the first controller controls the on-off of the power supply control circuit;
the input end of the voltage detection circuit is electrically connected with the output end of the power supply control circuit, and the output end of the voltage detection circuit is electrically connected with the first controller.
Preferably, the power supply device comprises an emergency power supply output control circuit, a second controller and a second battery;
the second battery is electrically connected with the emergency power supply output control circuit;
the second controller controls a channel of the emergency power supply output control circuit;
the second controller is in communication connection with the first controller;
when the electric quantity of the power supply equipment is lower than the threshold value, the output end of the emergency power supply output control circuit is electrically connected with the second input end of the external power supply automatic switching circuit, and the power supply of the power supply equipment is switched through the control of the second controller.
Furthermore, the external power supply automatic switching circuit comprises an ESD diode with an electrostatic prevention function, a first PMOS tube used as a switch, a first diode for preventing reverse connection and a first resistor;
one end of the ESD diode is electrically connected with the anode of the first battery and the drain of the first PMOS tube respectively, and the other end of the ESD diode is electrically connected with the cathode of the first battery and one end of the first resistor respectively;
the other end of the first resistor is electrically connected with the anode of the first diode, the grid of the first PMOS tube and the output end of the emergency power supply output control circuit respectively;
and the source electrode of the first PMOS tube is respectively and electrically connected with the cathode of the first diode and the input end of the protection circuit.
Still further, the protection circuit comprises a power protection chip, a first current limiting resistor, a second current limiting resistor, a third current limiting resistor, a first NMOS transistor, a second NMOS transistor, a first voltage dividing resistor, a second voltage dividing resistor, a first capacitor and a second capacitor;
the source electrode of the first PMOS tube is electrically connected with one end of the second current-limiting resistor, one end of the first divider resistor and one end of the first capacitor respectively;
the other end of the second current-limiting resistor is electrically connected with a VDD pin of the power supply protection chip;
the other end of the first capacitor is connected with the cathode of the first battery;
the other end of the first voltage-dividing resistor is electrically connected with one end of a third current-limiting resistor, one end of a second voltage-dividing resistor and one end of a second capacitor respectively;
the other end of the third current-limiting resistor is electrically connected with a VC pin of the power protection chip;
the other end of the second voltage-dividing resistor is connected with the cathode of the first battery;
the other end of the second capacitor is connected with the cathode of the first battery;
the CS pin of the power supply protection chip is grounded through a first current-limiting resistor;
the grid electrode of the first NMOS tube is electrically connected with the input end of the power supply control circuit and the OD pin of the power supply protection chip respectively;
the source electrode of the first NMOS tube and the VSS pin of the power protection chip are electrically connected with the negative electrode of the first battery;
the drain electrode of the first NMOS tube is electrically connected with the drain electrode of the second NMOS tube;
the source electrode of the second NMOS tube is grounded and is electrically connected with the CS pin of the power supply protection chip through a first current-limiting resistor;
and the grid electrode of the second NMOS tube is electrically connected with the OC pin of the power protection chip.
Still further, the protection circuit further comprises a third capacitor;
and the grid electrode of the first NMOS tube is connected with the input end of the power supply control circuit through a third capacitor.
Preferably, the power control circuit comprises a self-recovery switch, a fast recovery diode, a controller, a first switch unit, a second switch unit, a third switch unit and a sixth current-limiting resistor;
one end of the self-recovery switch is connected with the anode of the power supply, and the other end of the self-recovery switch is respectively and electrically connected with the second pin of the fast recovery diode and the first pin of the first switch unit through a sixth current-limiting resistor;
the first pin of the controller is electrically connected with the first pin of the fast recovery diode;
the second pin of the first switch unit is grounded;
the third pin of the first switch unit is electrically connected with the second pin of the controller and the VCC pin of the controller respectively;
the first pin of the second switch unit is electrically connected with the third pin of the fast recovery diode;
a second pin of the second switch unit is grounded;
the third pin of the second switch unit is electrically connected with the first pin of the third switch unit;
the second pin of the third switch unit is used for being connected with the output end of the protection circuit;
and the third pin of the third switching unit is used as an output end.
Furthermore, the first switch unit includes a first triode, a fourth current-limiting resistor, a fifth current-limiting resistor, a first pull-down resistor, and a first pull-up resistor;
the base electrode of the first triode is electrically connected with a second pin of the fast recovery diode, one end of a sixth current limiting resistor and one end of a first pull-down resistor through a fifth current limiting resistor respectively;
the other end of the first pull-down resistor is grounded;
the emitter of the first triode is grounded;
the collector of the first triode is electrically connected with one end of the first pull-up resistor and the second pin of the controller through a fourth current-limiting resistor respectively;
the other end of the first pull-up resistor is electrically connected with a VCC pin of the controller.
Still further, the second switch unit includes a second pull-down resistor, a seventh current-limiting resistor, and a second triode;
the base electrode of the second triode is electrically connected with one end of a second pull-down resistor and a third pin of the fast recovery diode through a seventh current-limiting resistor respectively;
the emitter of the second triode is grounded;
one end of the second pull-down resistor is grounded;
and the collector of the second triode is electrically connected with the first pin of the third switching unit.
Furthermore, the third switch unit includes an eighth current-limiting resistor, a fourth capacitor, a fifth capacitor, and a second PMOS transistor;
the grid electrode of the second PMOS tube is electrically connected with one end of the eighth current-limiting resistor, one end of the fourth capacitor and the collector electrode of the second triode respectively;
the other end of the eighth current-limiting resistor, the other end of the fourth capacitor and the source electrode of the second PMOS tube are electrically connected with the output end of the protection circuit;
and the drain electrode of the second PMOS tube is used as the output end of the power supply control circuit, one end of the fifth capacitor is connected with the drain electrode of the second PMOS tube, and the other end of the fifth capacitor is grounded.
Furthermore, the emergency power supply output control circuit comprises a fourth switch unit, a fifth switch unit for controlling whether to output power supply or not, and a voltage management unit for converting power supply voltage into power supply voltage required by power supply equipment;
a second pin of the second controller is electrically connected with a first pin of the fourth switching unit, and the high and low levels are output through the second pin of the second controller to control the conduction of the fourth switching unit;
a second pin of the fourth switch unit is grounded;
the third pin of the fourth switch unit is electrically connected with the first pin of the fifth switch unit;
the third pin of the fifth switch unit is electrically connected with the output end of the second battery;
the second pin of the fifth switch unit is electrically connected with the input end of the voltage management unit;
and the output end of the voltage management unit is electrically connected with the second input end of the external power supply automatic switching circuit.
The invention has the following beneficial effects:
the invention mainly aims at a detachable lithium battery equipment power supply control management circuit, mainly solves the problem of protecting a detachable lithium battery, greatly improves the problem of electric quantity loss when the detachable and non-detachable lithium batteries are connected with equipment but are not started for use, and does not damage the electric quantity even if the lithium batteries are assembled on the equipment for a long time.
The invention adopts a protection circuit with power-on self-activation and partial pressure detection, and combines an external power supply automatic switching circuit with static electricity and reverse connection protection functions, thereby ensuring effective protection of the detachable lithium battery, ensuring the replaceability of the battery and avoiding the limitation of the service life of the equipment by the service life of the battery.
The power supply control circuit with the combination of software and hardware and low power consumption can thoroughly turn off a battery power supply, can ensure that the production of lithium battery equipment is completed, can store for a long time, and simultaneously reduces the power loss without disassembling a battery when a user does not use the power supply control circuit.
Adopt power supply unit to carry out automatic switch and use outside power to supply power to power supply unit, applicable in some equipment externally use the electric quantity low lack simultaneously and lack the interface that can supply to charge again, can use power supply unit to come emergent power supply.
Drawings
Fig. 1 is a typical single lithium battery protection circuit.
Fig. 2 is a typical series protection circuit for two lithium batteries.
Fig. 3 is a functional block diagram of a management system according to the present invention.
Fig. 4 is a circuit diagram of the external power supply automatic switching circuit of the invention.
Fig. 5 is a circuit diagram of the protection circuit of the present invention.
Fig. 6 is a circuit diagram of the power control circuit of the present invention.
Fig. 7 is a circuit diagram of the voltage detection circuit of the present invention.
FIG. 8 is a functional block diagram of the management system of the present invention.
Fig. 9 is a circuit diagram of a fourth switching unit and a fifth switching unit according to the present invention.
Fig. 10 is a circuit diagram of a voltage management unit according to the present invention.
Detailed Description
The invention is described in detail below with reference to the drawings and the detailed description.
Example 1
As shown in fig. 3, a power control management system for a detachable lithium battery device includes a power device and a power supply device, where the power device is in communication connection with the power supply device, sends its own electric quantity information to the power supply device, and provides power to the power supply device according to the electric quantity information;
the power supply equipment comprises an external power supply automatic switching circuit with electrostatic and reverse connection protection functions, a protection circuit with functions of power-on self-activation and voltage division detection of battery voltage, a power supply control circuit, a voltage detection circuit, a first controller and a first battery;
the external power supply automatic switching circuit is electrically connected with the first battery;
the first input end of the external power supply automatic switching circuit is electrically connected with the first battery, the output end of the external power supply automatic switching circuit is electrically connected with the input end of the protection circuit, and the power supply of the power supply equipment is output to the protection circuit;
the output end of the protection circuit is electrically connected with the input end of the power supply control circuit, and the protection circuit automatically enters a protection mode when the voltage is too low or too high, and the current is over-discharged or over-charged;
the output end of the power supply control circuit is used as the output end of the power supply equipment;
according to the on-off signal input by the user, the high and low level output by the first controller controls the on-off of the power supply control circuit;
the input end of the voltage detection circuit is electrically connected with the output end of the power supply control circuit, and the output end of the voltage detection circuit is electrically connected with the first controller.
The invention mainly aims at a detachable lithium battery equipment power supply control management circuit, mainly solves the problem of protecting a detachable lithium battery, greatly improves the problem of electric quantity loss when the detachable and non-detachable lithium batteries are connected with equipment but are not started for use, and does not damage the electric quantity even if the lithium batteries are assembled on the equipment for a long time.
The invention adopts a protection circuit with power-on self-activation and partial pressure detection, and combines an external power supply automatic switching circuit with static electricity and reverse connection protection functions, thereby ensuring effective protection of the detachable lithium battery, ensuring the replaceability of the battery and avoiding the limitation of the service life of the equipment by the service life of the battery.
The power supply control circuit with the combination of software and hardware and low power consumption can thoroughly turn off a battery power supply, can ensure that the production of lithium battery equipment is completed, can store for a long time, and simultaneously reduces the power loss without disassembling a battery when a user does not use the power supply control circuit.
Adopt power supply unit to carry out automatic switch and use outside power to supply power to power supply unit, applicable in some equipment externally use the electric quantity low lack simultaneously and lack the interface that can supply to charge again, can use power supply unit to come emergent power supply.
The invention automatically enters into the protection mode when the voltage is too low or too high, and the current is over-discharged or over-charged, and at the moment, even if a user inputs an on-off signal, the protection circuit is in an off state and cannot output a power supply.
Example 2
On the basis of the embodiment 1, more specifically, as shown in fig. 4, the external power supply automatic switching circuit includes an ESD diode D2 having an electrostatic prevention function, a first PMOS transistor Q1 serving as a switch, a first diode D1 preventing reverse connection, and a first resistor R1;
one end of the ESD diode D2 is electrically connected with the anode of the first battery and the drain of the first PMOS tube Q1 respectively, and the other end of the ESD diode D2 is electrically connected with the cathode of the first battery and one end of the first resistor R1 respectively;
the other end of the first resistor R1 is electrically connected with the anode of a first diode D1, the grid of a first PMOS (P-channel metal oxide semiconductor) tube Q1 and the output end of the emergency power supply output control circuit respectively;
the source electrode of the first PMOS tube Q1 is electrically connected with the cathode of the first diode D1 and the input end of the protection circuit respectively.
When the first battery is mounted, the ESD diode D2 prevents static electricity from damaging the static sensitive device, the first battery is conducted through the first PMOS tube Q1, and the default grid electrode of the first PMOS tube Q1 is conducted in a low level mode. When the first battery is reversely connected, the grid electrode of the first PMOS tube Q1 is at a high level and is cut off, the power supply of the first battery is automatically cut off, and when the external power supply equipment inputs power through the first diode D1, the grid electrode of the first PMOS tube Q1 is at the high level and the first battery power is automatically cut off to be converted into power supply of the external power supply equipment.
In a specific embodiment, as shown in fig. 5, the protection circuit includes a power protection chip U1, a first current limiting resistor R3, a second current limiting resistor R4, a third current limiting resistor R2, a first NMOS transistor Q2, a second NMOS transistor Q3, a first voltage dividing resistor R5, a second voltage dividing resistor R6, a first capacitor C2, and a second capacitor C3;
the source electrode of the first PMOS tube Q1 is electrically connected with one end of a second current-limiting resistor R4, one end of a first voltage-dividing resistor R5 and one end of a first capacitor C2 respectively;
the other end of the second current-limiting resistor R4 is electrically connected with a VDD pin of the power protection chip U1;
the other end of the first capacitor C2 is connected with the negative electrode of the first battery;
the other end of the first voltage-dividing resistor R5 is electrically connected with one end of a third current-limiting resistor R2, one end of a second voltage-dividing resistor R6 and one end of a second capacitor C3 respectively;
the other end of the third current-limiting resistor R2 is electrically connected with a VC pin of a power protection chip U1;
the other end of the second voltage-dividing resistor R6 is connected with the cathode of the first battery;
the other end of the second capacitor C3 is connected with the negative electrode of the first battery;
the CS pin of the power protection chip U1 is grounded through a first current limiting resistor R3;
the grid electrode of the first NMOS tube Q2 is electrically connected with the input end of the power control circuit and the OD pin of the power protection chip U1 respectively;
the source electrode of the first NMOS tube Q2 and the VSS pin of the power protection chip U1 are electrically connected with the cathode of the first battery;
the drain electrode of the first NMOS tube Q2 is electrically connected with the drain electrode of the second NMOS tube Q3;
the source electrode of the second NMOS tube Q3 is grounded and is electrically connected with the CS pin of the power protection chip U1 through a first current limiting resistor R3;
and the grid electrode of the second NMOS tube Q3 is electrically connected with an OC pin of the power protection chip U1. The first battery is formed by connecting 2 lithium batteries in series, and the power protection chip U1 adopts 2120-CB as the power protection chip U1 formed by connecting 2 lithium batteries in series.
The first battery is input into the protection circuit after passing through the external power supply automatic switching circuit, and voltage division is performed through the second current limiting resistor R4R3, the second current limiting resistor R4R4, the first capacitor C2C2 and the second capacitor C3C3 through filtering, the first voltage dividing resistor R5R5 and the second voltage dividing resistor R6R6, and then voltage states of 2 lithium batteries are detected at VDD and VC pins of the power protection chip U1 respectively. When the voltage is detected to be too low, the OD pin of the power protection chip U1 outputs low level to control the first NMOS tube Q2Q2 to be cut off, so that the voltage is prevented from being over-discharged. When the voltage is detected to be too high, the OC pin of the power protection chip U1 outputs low level to control the second NMOS tube Q3Q1 to be cut off, so that the voltage is prevented from being overcharged. The discharging and charging currents are monitored through the voltage on the CS pin of the power protection chip U1 and the third current limiting resistor R2R2, and when the currents are over-discharged or over-charged, the circuit is protected by disconnecting the first NMOS transistor Q2Q2 or the second NMOS transistor Q3Q 1.
In a specific embodiment, the protection circuit further includes a third capacitor C1;
and the grid electrode of the first NMOS tube Q2 is connected with the input end of the power supply control circuit through a third capacitor C1.
The power protection chip U1U1 defaults to enter an over-discharge protection mode, after the first battery is disconnected every time, when the protection circuit is connected, the third capacitor C1C1 is charged, and in the moment, the grid electrode of the first NMOS tube Q2 outputs high level to control conduction, so that the protection circuit is automatically activated.
In a specific embodiment, as shown in fig. 6, the power control circuit includes a self-recovery switch S1, a fast recovery diode D3, a first switch unit, a second switch unit, a third switch unit, and a sixth current-limiting resistor R10;
one end of the self-recovery switch S1 is connected with the anode of the power supply, and the other end of the self-recovery switch S1 is electrically connected with the second pin of the fast recovery diode D3 and the first pin of the first switch unit through a sixth current-limiting resistor R10 respectively;
a first pin of the first controller is electrically connected with a first pin of a fast recovery diode D3;
the second pin of the first switch unit is grounded;
the third pin of the first switch unit is electrically connected with the second pin of the first controller and the VCC pin of the first controller respectively;
the first pin of the second switch unit is electrically connected with the third pin of the fast recovery diode D3;
a second pin of the second switch unit is grounded;
the third pin of the second switch unit is electrically connected with the first pin of the third switch unit;
the second pin of the third switch unit is used for being connected with the output end of the protection circuit;
and the third pin of the third switch unit is used as an output end.
The working principle of the power supply control circuit is as follows: the third switch unit is used for controlling the on-off of the power supply; the conduction of the second switch unit is controlled by the state of a self-recovery switch S1S1 and the high-low level output by a first pin of the first controller, and the on-off of the third switch unit 2 is further controlled according to the conduction of the second switch unit;
in the initial state, the third switching unit is in a cut-off state. The first switch unit is conducted according to the state of the self-recovery switch S1, and a state signal of the self-recovery switch S1 is input to a first pin of the first controller through the first switch unit; and after the first controller receives the state signal of the self-recovery switch S1 according to the first pin, the conduction of the second switch unit is controlled through the corresponding level of the first pin of the first controller, and the on-off of the third switch unit is further controlled.
In a specific embodiment, the first switching unit includes a first triode Q4, a fourth current limiting resistor R8, a fifth current limiting resistor R9, a first pull-down resistor R11, and a first pull-up resistor R7;
the base electrode of the first triode Q4 is electrically connected with the second pin of the fast recovery diode D3, one end of a sixth current limiting resistor R10 and one end of a first pull-down resistor R11 through a fifth current limiting resistor R9 respectively;
the other end of the first pull-down resistor R11 is grounded;
the emitting electrode of the first triode Q4 is grounded;
a collector of the first triode Q4 is electrically connected with one end of a first pull-up resistor R7 and a second pin of the controller through a fourth current-limiting resistor R8 respectively;
the other end of the first pull-up resistor R7 is electrically connected with a VCC pin of the controller.
When the self-recovery switch S1S1 is pressed down, the power supply BAT + inputs a high level through the second pin and the third pin of the fast recovery diode D3D1 to turn on the second switch unit, so that the third switch unit is also turned on, the power supply is turned on, and at the moment, the controller can work normally; meanwhile, a POWER supply BAT + outputs a high level to turn on a first triode Q4Q1 through a fifth current limiting resistor R9, a low level signal KEY is output to a second pin of the controller through a fourth current limiting resistor R8, the first controller detects the low level KEY signal for a certain time, the first controller changes the POWER state from the off state to the on state, and a fixed high level signal POWER _ EN is output to keep the high level through a first pin of the first controller and a first pin and a third pin of a fast recovery diode D3D 1.
The first pull-up resistor R7 keeps the first pin of the first controller in a high state, so the KEY signal is pulled up to a high level by default. When the first triode Q4 is turned on, the level of the first pin of the first controller changes to a low level.
In a specific embodiment, the second switching unit includes a second pull-down resistor R12, a seventh current-limiting resistor R13, and a second transistor Q5;
the base electrode of the second triode Q5 is electrically connected with one end of a second pull-down resistor R12 and a third pin of a fast recovery diode D3 through a seventh current-limiting resistor R13 respectively;
the emitting electrode of the second triode Q5 is grounded;
one end of the second pull-down resistor R12 is grounded;
and the collector of the second triode Q5 is electrically connected with the first pin of the third switch unit.
In an initial state, the third pin of the fast recovery diode D3 passes through the second pull-down resistor R12 by default, and the base of the second transistor Q5 in the second switch unit is at a low level, so that the second transistor Q5 is turned off, that is, the second switch unit is in a turned-off state. And the third switch unit is in a cut-off state, so that the output end of the power supply protection circuit is disconnected with the power supply output end, and power supply cannot be output.
At the moment when the self-recovery switch S1 is pressed, the power supply BAT + may input a high level through the sixth current limiting resistor R10, the second pin, the third pin, and the seventh current limiting resistor R13 of the fast recovery diode D3 to turn on the second triode Q5; the conducted second triode Q5 further controls the conduction of the third switching unit, and the power supply is turned on.
In a specific embodiment, the third switching unit includes an eighth current-limiting resistor R14, a fourth capacitor C4, a fifth capacitor C5, and a second PMOS transistor Q6;
the grid electrode of the second PMOS tube Q6 is electrically connected with one end of an eighth current-limiting resistor R14, one end of a fourth capacitor C4 and the collector electrode of the second triode Q5 respectively;
the other end of the eighth current-limiting resistor R14, the other end of the fourth capacitor C4 and the source electrode of the second PMOS tube Q6 are electrically connected with the output end of the protection circuit;
the drain electrode of the second PMOS pipe Q6 is used as the output end of the power supply control circuit, one end of the fifth capacitor C5 is connected with the drain electrode of the second PMOS pipe Q6, and the other end of the fifth capacitor C is grounded.
In the initial state, the second triode Q5 is cut off, the output end of the protection circuit outputs high level to the grid of the second PMOS transistor Q6 through the eighth current limiting resistor R14, the second PMOS transistor Q6 is cut off, and the power supply is disconnected. When the self-recovery switch S1S1 is pressed down, a high level is input to conduct the second triode Q5, the grid electrode of the second PMOS tube Q6 is conducted with GND and is at a low level, at the moment, the second PMOS tube Q6 is conducted, and the power supply is turned on.
Specifically, the working principle of the embodiment is as follows: IN an initial state, the third pin of the fast recovery diode D3 passes through the second pull-down resistor R12 by default, so that the base of the second triode Q5 is at a low level, the second triode Q5 is turned off, the battery power supply BAT _ IN output from the output terminal of the protection circuit outputs a high level to the gate of the second PMOS transistor Q6 through the eighth current-limiting resistor R14, the second PMOS transistor Q6 is turned off, and the power supply is turned off. When the self-recovery switch S1 is pressed down, the power supply BAT + passes through the sixth current limiting resistor R10, the second pin, the third pin, and the seventh current limiting resistor R13 of the fast recovery diode D3, and the input high level turns on the second triode Q5, the gate of the second PMOS transistor Q6 turns on with GND, and is at a low level, the second PMOS transistor Q6 turns on, and the power supply is turned on. At this time, the first controller can work normally, meanwhile, the POWER supply BAT + outputs a high level to turn on the first triode Q4 through the sixth current limiting resistor R10, the fifth current limiting resistor R9 and the first pull-down resistor R11, outputs a low level signal KEY to the second pin of the first controller through the fourth current limiting resistor R8, converts the POWER state from the off state to the on state after the first controller detects a low level KEY signal for a certain period of time, outputs a fixed high level signal POWER _ EN through the first pin of the first controller, and outputs a high level through the first pin of the fast recovery diode D3, so that the battery POWER supply is ensured to be kept on when the self-recovery switch S1 is automatically turned off.
When the KEY signal is defaulted to be pulled up to a high level, when the self-recovery switch S1S1 is released by pressing down again, the second pin of the first controller detects a falling edge pulse signal KEY signal, the first controller detects that the current POWER supply state is in a conducting state, the POWER supply state is switched to a disconnecting state from the conducting state, a fixed low-level signal POWER _ EN is output through the first pin of the first controller and input into the first pin of the fast-recovery diode D3, at the moment, the second triode Q5 and the second PMOS tube Q6 are cut off, the POWER supply is disconnected, and the starting state is returned.
The controller described in this embodiment may be a 51-chip microcomputer, an STM-chip microcomputer, or the like. The model of the fast recovery diode D3D1 is 4148CC.
In a specific embodiment, the voltage detection circuit is shown in fig. 7.
Example 3
Based on embodiment 1 or embodiment 2, more specifically, as shown in fig. 8, the power supply device according to this embodiment includes an emergency power supply output control circuit, a second controller, and a second battery;
the second battery is electrically connected with the emergency power supply output control circuit;
the second controller controls a channel of the emergency power supply output control circuit;
the second controller is in communication connection with the first controller;
when the electric quantity of the power supply equipment is lower than the threshold value, the output end of the emergency power supply output control circuit is electrically connected with the second input end of the external power supply automatic switching circuit, and the power supply of the power supply equipment is switched by the control of the second controller.
In a specific embodiment, as shown in fig. 9 and 10, the emergency power output control circuit includes a fourth switching unit, a fifth switching unit for controlling whether to output power, and a voltage management unit for converting a power supply voltage into a power supply voltage required by the power supply device;
a second pin of the second controller is electrically connected with a first pin of the fourth switching unit, and the high and low levels are output through the second pin of the second controller to control the conduction of the fourth switching unit;
a second pin of the fourth switch unit is grounded;
the third pin of the fourth switch unit is electrically connected with the first pin of the fifth switch unit;
the third pin of the fifth switch unit is electrically connected with the output end of the second battery;
the second pin of the fifth switch unit is electrically connected with the input end of the voltage management unit;
and the output end of the voltage management unit is electrically connected with the second input end of the external power supply automatic switching circuit.
The working principle of the invention is as follows: in the initial state, the fifth switch unit is in a cut-off state, namely a disconnected state; the second controller is externally connected with a first controller in the power supply device through a communication interface for communication, the first controller sends detected electric quantity information of the first battery to the second controller, the second controller outputs high and low levels through a second pin according to the electric quantity of the first battery, and then the fourth switch unit is controlled to be switched on through the second controller, and the fifth switch unit is controlled to be switched on through the fourth switch unit, so that the power supply switching of the output power supply to the power supply device is controlled. Through inputting to the grid of the first PMOS transistor Q1, the drain and the source of the first PMOS transistor Q1 are switched from on to off, and the power supply of the power supply device is switched from the first battery power supply to the power supply device power supply. The voltage management unit converts the output power voltage into the power voltage required by the power supply equipment, thereby ensuring the charging safety and being beneficial to prolonging the service life of the first battery in the power supply equipment.
In a specific embodiment, as shown in fig. 9, the fourth switching unit includes a ninth current limiting resistor R23 and a third transistor Q12;
one end of the ninth current-limiting resistor R23 is electrically connected to the second pin of the second controller;
the other end of the ninth current-limiting resistor R23 is electrically connected with the base of the third triode Q12;
the emitting electrode of the third triode Q12 is grounded;
and the collector of the third triode Q12 is electrically connected with the first pin of the fifth switching unit.
When the second controller receives the POWER information of the first controller, and when the POWER is too low, a fixed high level signal POWER _ EX is output through the second pin of the second controller, and the third triode Q12 is conducted through the ninth current limiting resistor R23.
In a specific embodiment, as shown in fig. 9, the fifth switching unit includes a sixth capacitor C16, a tenth current limiting resistor R24, a third PMOS transistor Q11, and a seventh capacitor C17;
the drain of the third PMOS transistor Q11 is electrically connected to one end of a sixth capacitor C16, one end of a tenth current-limiting resistor R24, and the output end of the second battery, respectively;
the grid electrode of the third PMOS transistor Q11 is electrically connected to the other end of the sixth capacitor C16, the other end of the tenth current-limiting resistor R24, and the collector electrode of the third triode Q12, respectively;
the source electrode of the third PMOS tube Q11 is electrically connected with the input end of the voltage management unit;
one end of the seventh capacitor C17 is electrically connected to the source of the third PMOS transistor Q11;
the other end of the seventh capacitor C17 is grounded.
In the initial state, the second battery outputs a high level to the source of the third PMOS transistor Q11 through the tenth current limiting resistor R24, the third PMOS transistor Q11 is turned off, and the power supply is turned off at this time. When the second controller outputs high level to make the third triode Q12 conducted, the third PMOS transistor Q11 is also conducted, and the power supply can normally output at this time.
In a specific embodiment, as shown in fig. 10, the voltage management unit includes a DCDC power chip U2, a third voltage dividing resistor R21, a fourth voltage dividing resistor R22, a second diode D11, and an inductor L1; the VIN pin and the EN pin of the DCDC power supply chip U2 are both electrically connected with the second pin of the fifth switch unit; in this embodiment, the VIN pin and the EN pin of the DCDC power chip U2 are both electrically connected to the source of the third PMOS transistor Q11 serving as the second pin of the fifth switch unit; one end of the inductor L1 is electrically connected with the VIN pin and the EN pin of the DCDC power supply chip U2 and the second pin of the fifth switch unit respectively;
the other end of the inductor L1 is electrically connected with the SW pin of the DCDC power supply chip U2 and the anode of the second diode D11 respectively;
the cathode of the second diode D11 is electrically connected to one end of the third voltage dividing resistor R21, and is externally connected to a power supply of the power supply device;
the other end of the third voltage dividing resistor R21 is electrically connected with one end of the fourth voltage dividing resistor R22 and the FB pin of the DCDC power supply chip U2 respectively;
the other end of the fourth voltage-dividing resistor R22 is grounded.
In this embodiment, the DCDC power chip U2 is a DCDC power chip U2 of a model MT3608, the inductor L1 is a high-power inductor L1, and the second diode D11 is a schottky second diode D11.
The power output from the source of the third PMOS transistor Q11 is converted into the power V _ EX output required by the power device by adjusting the resistances of the third voltage dividing resistor R21 and the fourth voltage dividing resistor R22 through the DCDC power chip U2.
In a specific embodiment, the voltage management unit further includes an eighth capacitor C14, a ninth capacitor 15;
one end of the eighth capacitor C14C3 and one end of the ninth capacitor 15 are both electrically connected to the second pin of the second switch unit; in this embodiment, one end of the eighth capacitor C14C3 and one end of the ninth capacitor 15 are both electrically connected to the source of the third PMOS transistor Q11Q3 serving as the second pin of the fifth switch unit;
the other end of the eighth capacitor C14C3 and the other end of the ninth capacitor 15 are both grounded.
The eighth capacitor C14C3 and the ninth capacitor 15 have a filtering function.
In a specific embodiment, the voltage management unit further includes a tenth capacitor C11, an eleventh capacitor C12, and a twelfth capacitor C13;
one end of the tenth capacitor C11 connected in parallel with the eleventh capacitor C12 is electrically connected to the third voltage dividing resistor R21 and the cathode of the second diode D11, respectively;
the other end of the tenth capacitor C11 and the eleventh capacitor C12 which are connected in parallel is grounded;
one end of the twelfth capacitor C13 is electrically connected to one end of the third voltage dividing resistor R21, the cathode of the second diode D11, the tenth capacitor C11, and the eleventh capacitor C12, which are connected in parallel, respectively;
the other end of the twelfth capacitor C13 is connected between the third voltage dividing resistor R21 and the fourth voltage dividing resistor R22.
In a specific embodiment, the first controller is communicatively connected with the second controller through a 485 communication interface. The second controller can select a 51 single chip microcomputer or can gate an STM single chip microcomputer.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims (10)

1. The utility model provides a can dismantle lithium battery equipment power control management system which characterized in that: the power supply equipment is in communication connection with the power supply equipment, sends self electric quantity information to the power supply equipment, and provides power for the power supply equipment according to the electric quantity information;
the power supply equipment comprises an external power supply automatic switching circuit with electrostatic and reverse connection protection functions, a protection circuit with functions of power-on self-activation and voltage division detection of battery voltage, a power supply control circuit, a voltage detection circuit, a first controller and a first battery;
the external power supply automatic switching circuit is electrically connected with the first battery;
the first input end of the external power supply automatic switching circuit is electrically connected with the first battery, the output end of the external power supply automatic switching circuit is electrically connected with the input end of the protection circuit, and the power supply of the power supply equipment is output to the protection circuit;
the output end of the protection circuit is electrically connected with the input end of the power supply control circuit, and the protection circuit automatically enters a protection mode when the voltage is too low or too high and the current is over-discharged or over-charged;
the output end of the power supply control circuit is used as the output end of the power supply equipment;
according to the on-off signal input by the user, the high and low level output by the first controller controls the on-off of the power supply control circuit;
the input end of the voltage detection circuit is electrically connected with the output end of the power supply control circuit, and the output end of the voltage detection circuit is electrically connected with the first controller.
2. The detachable lithium battery device power control management system of claim 1, characterized in that: the power supply equipment comprises an emergency power supply output control circuit, a second controller and a second battery;
the second battery is electrically connected with the emergency power supply output control circuit;
the second controller controls a channel of the emergency power supply output control circuit;
the second controller is in communication connection with the first controller;
when the electric quantity of the power supply equipment is lower than the threshold value, the output end of the emergency power supply output control circuit is electrically connected with the second input end of the external power supply automatic switching circuit, and the power supply of the power supply equipment is switched by the control of the second controller.
3. The detachable lithium battery device power control management system of claim 2, characterized in that: the external power supply automatic switching circuit comprises an ESD diode (D2) with an electrostatic prevention function, a first PMOS (P-channel metal oxide semiconductor) tube (Q1) serving as a switch, a first diode (D1) for preventing reverse connection and a first resistor (R1);
one end of the ESD diode (D2) is electrically connected with the anode of the first battery and the drain of the first PMOS tube (Q1) respectively, and the other end of the ESD diode (D2) is electrically connected with the cathode of the first battery and one end of the first resistor (R1) respectively;
the other end of the first resistor (R1) is electrically connected with the anode of the first diode (D1), the grid of the first PMOS tube (Q1) and the output end of the emergency power supply output control circuit respectively;
and the source electrode of the first PMOS tube (Q1) is respectively and electrically connected with the cathode of the first diode (D1) and the input end of the protection circuit.
4. The detachable lithium battery equipment power control management system of claim 3, characterized in that: the protection circuit comprises a power supply protection chip (U1), a first current limiting resistor (R3), a second current limiting resistor (R4), a third current limiting resistor (R2), a first NMOS (N-channel metal oxide semiconductor) tube (Q2), a second NMOS (Q3) tube, a first voltage dividing resistor (R5), a second voltage dividing resistor (R6), a first capacitor (C2) and a second capacitor (C3);
the source electrode of the first PMOS tube (Q1) is electrically connected with one end of the second current-limiting resistor (R4), one end of the first voltage-dividing resistor (R5) and one end of the first capacitor (C2) respectively;
the other end of the second current-limiting resistor (R4) is electrically connected with a VDD pin of the power protection chip (U1);
the other end of the first capacitor (C2) is connected with the negative electrode of the first battery;
the other end of the first voltage-dividing resistor (R5) is electrically connected with one end of a third current-limiting resistor (R2), one end of a second voltage-dividing resistor (R6) and one end of a second capacitor (C3) respectively;
the other end of the third current limiting resistor (R2) is electrically connected with a VC pin of the power protection chip (U1);
the other end of the second voltage-dividing resistor (R6) is connected with the negative electrode of the first battery;
the other end of the second capacitor (C3) is connected with the negative electrode of the first battery;
the CS pin of the power supply protection chip (U1) is grounded through a first current limiting resistor (R3);
the grid electrode of the first NMOS tube (Q2) is electrically connected with the input end of the power supply control circuit and the OD pin of the power supply protection chip (U1) respectively;
the source electrode of the first NMOS tube (Q2) and the VSS pin of the power protection chip (U1) are electrically connected with the negative electrode of the first battery;
the drain electrode of the first NMOS (Q2) tube is electrically connected with the drain electrode of the second NMOS (Q3) tube;
the source electrode of the second NMOS (Q3) tube is grounded and is electrically connected with the CS pin of the power protection chip (U1) through a first current limiting resistor (R3);
and the grid electrode of the second NMOS (Q3) tube is electrically connected with an OC pin of the power protection chip (U1).
5. The detachable lithium battery equipment power control management system of claim 4, characterized in that: the protection circuit further comprises a third capacitor (C1);
and the grid electrode of the first NMOS tube (Q2) is connected with the input end of the power supply control circuit through a third capacitor (C1).
6. The detachable lithium battery device power control management system of claim 1, characterized in that: the power supply control circuit comprises a self-recovery switch (S1), a fast recovery diode (D3), a controller, a first switch unit, a second switch unit, a third switch unit and a sixth current-limiting resistor (R10);
one end of the self-recovery switch (S1) is connected with the anode of the power supply, and the other end of the self-recovery switch (S1) is respectively and electrically connected with the second pin of the fast recovery diode (D3) and the first pin of the first switch unit through a sixth current-limiting resistor (R10);
the first pin of the controller is electrically connected with the first pin of the fast recovery diode (D3);
the second pin of the first switch unit is grounded;
the third pin of the first switch unit is electrically connected with the second pin of the controller and the VCC pin of the controller respectively;
the first pin of the second switch unit is electrically connected with the third pin of the fast recovery diode (D3);
a second pin of the second switch unit is grounded;
the third pin of the second switch unit is electrically connected with the first pin of the third switch unit;
the second pin of the third switch unit is used for being connected with the output end of the protection circuit;
and the third pin of the third switch unit is used as an output end.
7. The detachable lithium battery device power control management system of claim 6, wherein: the first switch unit comprises a first triode (Q4), a fourth current limiting resistor (R8), a fifth current limiting resistor (R9), a first pull-down resistor (R11) and a first pull-up resistor (R7);
the base electrode of the first triode (Q4) is electrically connected with the second pin of the fast recovery diode (D3), one end of the sixth current limiting resistor (R10) and one end of the first pull-down resistor (R11) through the fifth current limiting resistor (R9) respectively;
the other end of the first pull-down resistor (R11) is grounded;
the emitting electrode of the first triode (Q4) is grounded;
a collector of the first triode (Q4) is electrically connected with one end of the first pull-up resistor (R7) and a second pin of the controller through a fourth current-limiting resistor (R8) respectively;
the other end of the first pull-up resistor (R7) is electrically connected with a VCC pin of the controller.
8. The detachable lithium battery device power control management system of claim 6, wherein: the second switch unit comprises a second pull-down resistor (R12), a seventh current limiting resistor (R13) and a second triode (Q5);
the base electrode of the second triode (Q5) is electrically connected with one end of the second pull-down resistor (R12) and the third pin of the fast recovery diode (D3) through a seventh current-limiting resistor (R13);
the emitter of the second triode (Q5) is grounded;
one end of the second pull-down resistor (R12) is grounded;
and the collector electrode of the second triode (Q5) is electrically connected with the first pin of the third switch unit.
9. The detachable lithium battery device power control management system of claim 8, wherein: the third switching unit comprises an eighth current limiting resistor (R14), a fourth capacitor (C4), a fifth capacitor (C5) and a second PMOS (P-channel metal oxide semiconductor) tube (Q6);
the grid electrode of the second PMOS tube (Q6) is electrically connected with one end of an eighth current-limiting resistor (R14), one end of a fourth capacitor (C4) and the collector electrode of the second triode (Q5) respectively;
the other end of the eighth current limiting resistor (R14), the other end of the fourth capacitor (C4) and the second capacitor
The source electrodes of the PMOS tubes (Q6) are electrically connected with the output end of the protection circuit;
the drain electrode of the second PMOS tube (Q6) is used as the output end of the power supply control circuit, one end of the fifth capacitor (C5) is connected with the drain electrode of the second PMOS tube (Q6), and the other end of the fifth capacitor is grounded.
10. The detachable lithium battery device power control management system of claim 2, characterized in that: the emergency power supply output control circuit comprises a fourth switch unit, a fifth switch unit for controlling whether to output power supply or not and a voltage management unit for converting power supply voltage into power supply voltage required by power supply equipment;
a second pin of the second controller is electrically connected with a first pin of the fourth switching unit, and the high and low levels are output through the second pin of the second controller to control the conduction of the fourth switching unit;
a second pin of the fourth switch unit is grounded;
the third pin of the fourth switch unit is electrically connected with the first pin of the fifth switch unit;
the third pin of the fifth switch unit is electrically connected with the output end of the second battery;
the second pin of the fifth switch unit is electrically connected with the input end of the voltage management unit;
and the output end of the voltage management unit is electrically connected with the second input end of the external power supply automatic switching circuit.
CN202210867812.0A 2022-07-22 2022-07-22 Detachable lithium battery equipment power control management system Pending CN115395598A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202210867812.0A CN115395598A (en) 2022-07-22 2022-07-22 Detachable lithium battery equipment power control management system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210867812.0A CN115395598A (en) 2022-07-22 2022-07-22 Detachable lithium battery equipment power control management system

Publications (1)

Publication Number Publication Date
CN115395598A true CN115395598A (en) 2022-11-25

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN202210867812.0A Pending CN115395598A (en) 2022-07-22 2022-07-22 Detachable lithium battery equipment power control management system

Country Status (1)

Country Link
CN (1) CN115395598A (en)

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