WO2019169541A1 - Discharge indicator light control circuit and lithium battery power supply protection board thereof - Google Patents

Discharge indicator light control circuit and lithium battery power supply protection board thereof Download PDF

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Publication number
WO2019169541A1
WO2019169541A1 PCT/CN2018/078081 CN2018078081W WO2019169541A1 WO 2019169541 A1 WO2019169541 A1 WO 2019169541A1 CN 2018078081 W CN2018078081 W CN 2018078081W WO 2019169541 A1 WO2019169541 A1 WO 2019169541A1
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WIPO (PCT)
Prior art keywords
lithium battery
switch
discharge
circuit
led
Prior art date
Application number
PCT/CN2018/078081
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French (fr)
Chinese (zh)
Inventor
姚启振
Original Assignee
深圳大力神科技有限公司
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Priority to CN201880002568.3A priority Critical patent/CN109417207A/en
Priority to PCT/CN2018/078081 priority patent/WO2019169541A1/en
Publication of WO2019169541A1 publication Critical patent/WO2019169541A1/en

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    • 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
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
    • 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
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • 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
    • H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
    • H01M10/486—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte for measuring temperature
    • 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
    • H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
    • H01M10/488—Cells or batteries combined with indicating means for external visualization of the condition, e.g. by change of colour or of light density
    • 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
    • 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
    • H02J7/0047—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
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H02J7/00309—Overheat or overtemperature 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
    • 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

Definitions

  • the present invention relates to the field of lithium battery technology, and in particular, to a discharge indicator control circuit and a lithium battery power protection board.
  • Lithium battery has the advantages of small volume, light weight, large specific energy, high specific power, no memory effect, small self-discharge, long cycle life, fast discharge, high efficiency, etc., and the lithium ion battery is a green battery. Secondary pollution caused by waste has gradually become the mainstream of power batteries.
  • the lithium battery is generally managed by the lithium battery management system BMS.
  • the BMS is installed inside the lithium battery pack, and the single chip is used as the control core.
  • the energy balance of each lithium battery can be realized, and the overcharge, over discharge and over Flow, temperature protection and short circuit protection, display various states of the battery pack through the LCD, and can read the historical performance status of each lithium battery through the reserved communication port.
  • the lithium battery intelligent management system BMS is mainly composed of a charging module, a data acquisition module (including voltage, current, temperature data acquisition), an equalization module, a power calculation module, a data display module, and a storage communication module;
  • the MCU is the main controller.
  • the system determines whether to start the equalization module to energy balance the entire battery pack, and at the same time determine whether there is overcharge or overdischarge.
  • Temperature collection is mainly used for over-temperature protection of the system. The working status, current, voltage of each section, remaining power and temperature information of the whole system will be displayed in real time through the LCD module.
  • the discharge indicator light When the lithium battery is discharged, the discharge indicator light is generally used to indicate that the lithium battery is in a discharge state, and the discharge indicator light is also called a tail light, generally using an LED lamp bead; when the lithium battery is discharged, the discharge indicator needs to be turned off.
  • the existing lithium battery management system generally uses a high-impedance method to realize that the tail light is not bright.
  • the specific implementation method is to make the digital multimeter voltage file test output voltage lower than 3V, that is, lower than the tail lamp LED 3V driving voltage, so that The tail light is not lit.
  • the internal impedance of the digital multimeter voltage file is 10M or more, for example, the 48V battery pack should be displayed as 3V using the multimeter voltage file, and the output impedance of the power protection board must be 150M or more, which will cause the entire management system to be under such high impedance. Work will be greatly affected by the environment, resulting in failure to charge and discharge.
  • the object of the present invention is to provide a discharge indicator control circuit and a lithium battery power protection board thereof, which can adversely affect the existing lithium battery management system by using a high impedance method to realize that the tail light is not bright. technical problem.
  • a discharge indicator control circuit includes a weak current switch SW4, an LED drive module CT2, and an LED switch SW3.
  • the weak current switch and the LED drive module CT2 are connected to a lithium battery control module CT1, and the LED switch SW3 and The discharge indicator lamp and the battery pack BY form a loop, and the LED drive module CT2 is connected to the LED switch SW3.
  • CT1 when SW4 is closed, the closing voltage is transmitted to CT1 at a high level, CT1 sends an open signal to the driving module CT2, and CT2 issues an open signal to drive the LED switch SW3, thereby illuminating the LED discharging indicator LOAD2, when SW4 is off
  • the disconnection voltage is low level and transmitted to CT1
  • CT1 sends a shutdown signal to the drive module CT2
  • CT2 sends a shutdown signal to drive the LED switch SW3, thereby turning off the LED discharge indicator LOAD2, when the battery pack BY is used up.
  • CT1 sends a battery over-discharge signal to the drive module CT2, and CT2 sends a shutdown signal to drive the LED switch SW3, thereby turning off the LED discharge indicator LOAD2, so as to prevent the battery pack from damaging the battery pack BY due to heavy discharge.
  • one end of the weak current switch SW4 is connected to the negative pole of the battery pack, and the other end is connected to the lithium battery control module CT1.
  • the weak current switch SW4 is connected in parallel with a discharge switch SW1, and the discharge switch SW1 is connected to the lithium battery control module CT1.
  • the discharge switch SW1, the battery pack and a load LOAD1 form a loop.
  • the weak current switch SW4 is connected in parallel with a charging switch SW1, and the charging switch SW1 is connected to the lithium battery control module CT1.
  • the charging switch SW1, the battery pack and a charger CH form a loop.
  • a lithium battery power protection board which is composed of a lithium battery control module CT1, a discharge indicator lamp and the above-mentioned indicator control circuit, and the lithium battery control module CT1 includes a lithium battery protection IC.
  • the lithium battery protection IC chip is connected to the battery pack through the overvoltage and undervoltage comparison circuit, the charging MOS switch circuit and the lithium a charging MOSFET control pin connection of the battery protection IC chip, the discharge MOS switch circuit is connected to a discharge MOSFET control pin of the lithium battery protection IC chip;
  • the indicator control circuit comprises a weak current switch SW4 and an LED driving module CT2 And an LED switch SW3, wherein the weak current switch and the SW4 and the LED driving module CT2 are connected to the lithium battery protection IC chip.
  • the lithium battery control module CT1 further includes a load and charge detection circuit, the load and the charge detection circuit are connected at one end to a negative connector of the charger or the load, and the other end is connected to the charger of the lithium battery protection IC chip.
  • the sense pin is connected to the load sense pin.
  • the lithium battery control module CT1 further includes a temperature detecting circuit and a protection delay circuit, and the temperature detecting circuit and the protection delay circuit are respectively connected to the temperature detecting pin and the extension of the lithium battery protection IC chip. Time pin.
  • the overvoltage and undervoltage comparison circuit is connected at one end to the positive and negative terminals of the lithium battery, and at the other end to the positive terminal of the battery of the lithium battery protection IC chip.
  • the discharge indicator control circuit and the lithium battery power protection board of the invention respectively control the main current discharge circuit and the small current discharge circuit to realize effective shutdown of the LED lamp. Since the current loop is used in parallel, there is no task impact on the main current loop. . Compared with other similar products, the tail light can be effectively extinguished, and the tail light is more stable under low impedance conditions. Compared with similar products, the high-impedance shutdown mode has obvious effects.
  • FIG. 1 is a structural block diagram of a lithium battery management system according to an embodiment of the present invention.
  • FIG. 2 is a structural block diagram of a discharge indicator control circuit according to an embodiment of the present invention.
  • FIG. 3 is a structural block diagram of a power protection board for a lithium battery according to an embodiment of the present invention.
  • FIG. 4 is a pin diagram of a lithium battery protection IC chip according to an embodiment of the present invention.
  • 10-lithium battery protection IC chip 20-charge MOS switch circuit, 30-discharge MOS switch circuit, 40-indicator control circuit, 50-load and charge detection circuit, 60-temperature detection circuit, 70-overvoltage Pressure comparison circuit, 80-protection delay circuit, 90-battery pack.
  • BMS is the first letter combination of BATTERY MANAGEMENT SYSTEM, which is called battery management system.
  • Battery management system Commonly known as battery nanny or battery housekeeper; battery management system (BMS) is mainly to intelligently manage and maintain each battery unit, prevent battery overcharge and over discharge, extend battery life, monitor battery status.
  • the lithium battery management system is installed inside the lithium battery pack. With the single-chip microcomputer as the control core, it can realize over-charge, over-discharge, over-current, temperature protection and short-circuit protection while achieving energy balance of each lithium battery.
  • the various states of the battery pack are displayed through the LCD, and the historical performance state of each of the lithium batteries can be read through the reserved communication port.
  • the lithium battery intelligent management system is mainly composed of a charging module, a data acquisition module (including voltage, current, temperature data acquisition), an equalization module, a power calculation module, a data display module, and a storage communication module.
  • the whole system uses the single-chip microcomputer as the main controller. By collecting the current information, it is judged whether the battery pack is charging, discharging or idle and whether there is overcurrent phenomenon, and the state is correspondingly processed. After collecting and analyzing the battery voltages of each section, the system determines whether to start the equalization module to energy balance the entire battery pack, and at the same time determine whether there is overcharge or overdischarge. Temperature collection is mainly used for over-temperature protection of the system. The working status, current, voltage of each section, remaining power and temperature information of the whole system will be displayed in real time through the LCD module.
  • an embodiment of the present invention provides a discharge indicator control circuit including a weak current switch SW4, an LED driving module CT2, and an LED switch SW3, the weak current switch and the LED driving module CT2 and lithium.
  • the battery control module CT1 is connected, the LED switch SW3 forms a loop with the discharge indicator lamp and the battery pack BY, and the LED drive module CT2 is connected to the LED switch SW3.
  • CT1 when SW4 is closed, the closing voltage is transmitted to CT1 at a high level, CT1 sends an open signal to the driving module CT2, and CT2 issues an open signal to drive the LED switch SW3, thereby illuminating the LED discharging indicator LOAD2, when SW4 is off
  • the disconnection voltage is low level and transmitted to CT1
  • CT1 sends a shutdown signal to the drive module CT2
  • CT2 sends a shutdown signal to drive the LED switch SW3, thereby turning off the LED discharge indicator LOAD2, when the battery pack BY is used up.
  • CT1 sends a battery over-discharge signal to the drive module CT2, and CT2 sends a shutdown signal to drive the LED switch SW3, thereby turning off the LED discharge indicator LOAD2, so as to prevent the battery pack from damaging the battery pack BY due to heavy discharge.
  • the one end of the weak current switch SW4 is connected to the negative pole of the battery pack, and the other end is connected to the lithium battery control module CT1.
  • the weak current switch SW4 is connected in parallel with a discharge switch SW1.
  • the discharge switch SW1 is connected to the lithium battery control module CT1.
  • the discharge switch SW1, the battery pack and a load LOAD1 form a loop.
  • the power switch SW4 is connected in parallel with a charging switch SW1.
  • the charging switch SW1 is connected to the lithium battery control module CT1.
  • the charging switch SW1, the battery pack and a charger CH form a loop.
  • SW1, SW2, SW3, and SW4 may be MOS transistors as switching devices.
  • the LED driver module is a conventional LED lamp driver.
  • a lithium battery power protection board provided by the present invention is composed of a lithium battery control module CT1, a discharge indicator LOAD2, and the above indicator control circuit 40, the lithium
  • the battery control module CT1 includes a lithium battery protection IC chip 10, a charging MOS switch circuit 20, a discharge MOS switch circuit 30, and an overvoltage and undervoltage comparison circuit 70, and the lithium battery protection IC chip 10 passes the overvoltage and undervoltage comparison circuit.
  • the control pin circuit includes a weak switch SW4, an LED drive module CT2, and an LED switch SW3, the weak switch and the SW4, the LED drive module CT2, and the lithium battery protection IC chip 10. connection.
  • the lithium battery control module CT1 further includes a load and charge detection circuit 50, and one end of the load and charge detection circuit 50 is connected to a negative connector of a charger or a load, and the other end is protected by the lithium battery protection IC chip 10.
  • the charger sense pin is connected to the load sense pin.
  • the lithium battery control module CT1 further includes a temperature detecting circuit 60 and a protection delay circuit 80.
  • the temperature detecting circuit 60 and the protection delay circuit 80 respectively connect the temperature detection of the lithium battery protection IC chip 10. Pin and delay pin.
  • the overvoltage and undervoltage comparison circuit 70 is connected at one end to the positive and negative terminals of the lithium battery 90, and at the other end to the positive terminal of the battery of the lithium battery protection IC chip 10.
  • the pin diagram of the lithium battery protection IC chip of the model SH367107, the lithium battery protection IC chip of the above model can realize the construction of the power protection board, and of course, is not limited to the IC chip of the above model.
  • the discharge indicator control circuit and the lithium battery power protection board of the invention respectively control the main current discharge circuit and the small current discharge circuit to realize effective shutdown of the LED lamp. Since the current loop is used in parallel, there is no task impact on the main current loop. Compared with the existing method of improving the impedance of the main current loop to solve the dimming of the LED taillights. Compared with other similar products, the tail light can be effectively extinguished, and the tail light is more stable under low impedance conditions. Compared with similar products, the high-impedance shutdown mode has obvious effects.
  • first and second are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated.
  • features defining “first” and “second” may expressly or implicitly include at least one of the features.
  • the meaning of "a plurality” is at least two, such as two, three, etc., unless specifically defined otherwise.
  • the terms "installation”, “connected”, “connected”, “fixed”, “fixed” and the like shall be understood broadly, and may be, for example, a fixed connection, unless otherwise specifically defined and defined. It can be a detachable connection, or can be integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, which can be the internal connection of two elements or the interaction of two elements. Unless otherwise expressly defined. For those skilled in the art, the specific meanings of the above terms in the patent of the present invention can be understood on a case-by-case basis.
  • the first feature "on” or “under” the second feature may be a direct contact of the first and second features, or the first and second features are passed through an intermediate medium, unless otherwise explicitly defined and defined. Indirect contact.
  • the first feature "above”, “above” and “above” the second feature may be that the first feature is directly above or above the second feature, or merely that the first feature level is higher than the second feature.
  • the first feature “below”, “below” and “below” the second feature may be that the first feature is directly below or obliquely below the second feature, or merely that the first feature level is less than the second feature.

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

Abstract

A discharge indicator light control circuit and a lithium battery power supply protection board thereof, for use in solving the technical problem of adverse effects on the existing lithium battery management system caused by not turning on taillights by means of high impedance. The indicator light control circuit comprises a weak current switch (SW4), an LED drive module (CT2), and an LED switch (SW3). The weak current switch (SW4) and the LED drive module (CT2) are connected to a lithium battery control module (CT1). A loop is formed between the LED switch (SW3) and a discharge indicator light (LOAD2), and a battery set (BY). The LED drive module (CT2) is connected to the LED switch (SW3). The discharge indicator light control circuit controls a main current discharge loop and a small current discharge loop, separately for effectively turning off an LED lamp. Current loops are used in parallel, which has no effect on the main current loop.

Description

一种放电指示灯控制电路及其锂电池电源保护板Discharge indicator light control circuit and lithium battery power protection board 技术领域Technical field
本发明涉及锂电池技术领域，尤其涉及一种放电指示灯控制电路及其锂电池电源保护板。The present invention relates to the field of lithium battery technology, and in particular, to a discharge indicator control circuit and a lithium battery power protection board.
背景技术Background technique
锂电池由于具有体积小、质量轻、比能量大，比功率高，无记忆效应，自放电小，循环使用寿命长，可快速放电，且效率高等优点，而且锂离子蓄电池是绿色蓄电池，不会因废弃造成二次污染，逐渐成为动力电池的主流。锂电池一般通过锂电池组管理***BMS进行管理，BMS安装在锂电池组的内部，以单片机为控制核心，在实现对各节锂电池能量均衡的同时，还可以实现过充、过放、过流、温度保护及短路保护，通过LCD显示电池组的各种状态，并可以通过预留的通信端口读取各节锂电池的历史性能状态。如图1所示，锂电池智能管理***BMS主要由充电模块、数据采集模块(包括电压、电流、温度数据采集)、均衡模块、电量计算模块、数据显示模块和存储通信模块组成；整个***以单片机为主控制器，通过采集电流信息，判断出电池组是在充电、放电还是在闲置状态及是否有过流现象，并对其状态做出相应处理。对各节电池电压进行采集分析后，***决定是否启动均衡模块对整个电池组进行能量均衡，同时判断是否有过充或过放现象。温度的采集主要用于***的过温保护。整个***的工作状态、电流、各节电压、剩余电量及温度信息都会通过液晶显示模块实时显示。Lithium battery has the advantages of small volume, light weight, large specific energy, high specific power, no memory effect, small self-discharge, long cycle life, fast discharge, high efficiency, etc., and the lithium ion battery is a green battery. Secondary pollution caused by waste has gradually become the mainstream of power batteries. The lithium battery is generally managed by the lithium battery management system BMS. The BMS is installed inside the lithium battery pack, and the single chip is used as the control core. At the same time, the energy balance of each lithium battery can be realized, and the overcharge, over discharge and over Flow, temperature protection and short circuit protection, display various states of the battery pack through the LCD, and can read the historical performance status of each lithium battery through the reserved communication port. As shown in Figure 1, the lithium battery intelligent management system BMS is mainly composed of a charging module, a data acquisition module (including voltage, current, temperature data acquisition), an equalization module, a power calculation module, a data display module, and a storage communication module; The MCU is the main controller. By collecting the current information, it is judged whether the battery pack is charging, discharging or idle and whether there is overcurrent phenomenon, and the state is correspondingly processed. After collecting and analyzing the battery voltages of each section, the system determines whether to start the equalization module to energy balance the entire battery pack, and at the same time determine whether there is overcharge or overdischarge. Temperature collection is mainly used for over-temperature protection of the system. The working status, current, voltage of each section, remaining power and temperature information of the whole system will be displayed in real time through the LCD module.
在锂电池放电时，一般采用了放电指示灯标识锂电池处于放电使用状态，放电指示灯也被称为尾灯，一般采用LED灯珠；当锂电池结束放电使用状态时，放电指示灯需要被关闭，现有的锂电池管理***一般通过使用高阻抗的方式来实现尾灯不亮，具体实现方式为使数字万用表电压档测试输出电压低于3V，也就是低于尾灯LED 3V的驱动电压，使之实现尾灯不亮。因为数字万用表电压档的内部阻抗为10M以上，要将例如48V电池组使用万用表电压档显示为3V，须将电源保护板的输出阻抗为150M以上，这样会造成整个管理***在如此高的阻抗下工作会受到环境的影响很大，造成不能充放电。When the lithium battery is discharged, the discharge indicator light is generally used to indicate that the lithium battery is in a discharge state, and the discharge indicator light is also called a tail light, generally using an LED lamp bead; when the lithium battery is discharged, the discharge indicator needs to be turned off. The existing lithium battery management system generally uses a high-impedance method to realize that the tail light is not bright. The specific implementation method is to make the digital multimeter voltage file test output voltage lower than 3V, that is, lower than the tail lamp LED 3V driving voltage, so that The tail light is not lit. Because the internal impedance of the digital multimeter voltage file is 10M or more, for example, the 48V battery pack should be displayed as 3V using the multimeter voltage file, and the output impedance of the power protection board must be 150M or more, which will cause the entire management system to be under such high impedance. Work will be greatly affected by the environment, resulting in failure to charge and discharge.
发明内容Summary of the invention
有鉴于此，本发明的目的在于提供一种放电指示灯控制电路及其锂电池电源保护板，针对现有采用高阻抗方式实现尾灯不亮会对现有的锂电池管理***带来不利影响的技术问题。In view of this, the object of the present invention is to provide a discharge indicator control circuit and a lithium battery power protection board thereof, which can adversely affect the existing lithium battery management system by using a high impedance method to realize that the tail light is not bright. technical problem.
本发明解决上述技术问题所采用的技术方案如下：The technical solution adopted by the present invention to solve the above technical problems is as follows:
一种放电指示灯控制电路，包括弱电开关SW4、LED驱动模组CT2以及LED开关SW3，所述弱电开关和所述LED驱动模组CT2与锂电池控制模组CT1连接，所述LED开关SW3与放电指示灯以及电池组BY形成回路，所述LED驱动模组CT2与所述LED开关SW3连接。A discharge indicator control circuit includes a weak current switch SW4, an LED drive module CT2, and an LED switch SW3. The weak current switch and the LED drive module CT2 are connected to a lithium battery control module CT1, and the LED switch SW3 and The discharge indicator lamp and the battery pack BY form a loop, and the LED drive module CT2 is connected to the LED switch SW3.
具体地，当SW4闭合时，闭合电压为高电平传输到CT1，CT1发出打开信号传输到驱动模组CT2,CT2发出打开信号驱动LED开关SW3,从而点亮LED放电指示灯LOAD2,当SW4断开时，断开电压为低电平传输到CT1，CT1发出关闭信号传输到驱动模组CT2,CT2发出关闭信号驱动LED开关SW3,从而关闭LED放电指示灯LOAD2,当电池组BY容量用完时，CT1发出电池过放信号传输到驱动模组CT2，CT2发出关闭信号驱动LED开关SW3,从而关闭LED放电指示灯LOAD2,以免电池组由于重度放电而损坏电池组BY。Specifically, when SW4 is closed, the closing voltage is transmitted to CT1 at a high level, CT1 sends an open signal to the driving module CT2, and CT2 issues an open signal to drive the LED switch SW3, thereby illuminating the LED discharging indicator LOAD2, when SW4 is off When open, the disconnection voltage is low level and transmitted to CT1, CT1 sends a shutdown signal to the drive module CT2, and CT2 sends a shutdown signal to drive the LED switch SW3, thereby turning off the LED discharge indicator LOAD2, when the battery pack BY is used up. CT1 sends a battery over-discharge signal to the drive module CT2, and CT2 sends a shutdown signal to drive the LED switch SW3, thereby turning off the LED discharge indicator LOAD2, so as to prevent the battery pack from damaging the battery pack BY due to heavy discharge.
进一步的，所述弱电开关SW4一端与所述电池组的负极连接，另一端与所述锂电池控制模组CT1连接。Further, one end of the weak current switch SW4 is connected to the negative pole of the battery pack, and the other end is connected to the lithium battery control module CT1.
进一步的，所述弱电开关SW4与一放电开关SW1并联，所述放电开关SW1连接所述锂电池控制模组CT1，所述放电开关SW1、所述电池组以及一负载LOAD1形成一回路。Further, the weak current switch SW4 is connected in parallel with a discharge switch SW1, and the discharge switch SW1 is connected to the lithium battery control module CT1. The discharge switch SW1, the battery pack and a load LOAD1 form a loop.
进一步的，所述弱电开关SW4与一充电开关SW1并联，所述充电开关SW1连接所述锂电池控制模组CT1，所述充电开关SW1、所述电池组以及一充电器CH形成一回路。Further, the weak current switch SW4 is connected in parallel with a charging switch SW1, and the charging switch SW1 is connected to the lithium battery control module CT1. The charging switch SW1, the battery pack and a charger CH form a loop.
根据本发明的一个方面，提供的一种锂电池电源保护板，由锂电池控制模组CT1、放电指示灯以及上述的指示灯控制电路组成，所述锂电池控制模组CT1包括锂电池保护IC芯片、充电MOS开关电路、放电MOS开关电路以及过压欠压比较电路，所述锂电池保护IC芯片通过所述过压欠压比较电路与电池组连接，所述充电MOS开关电路与所述锂电池保护IC芯片的充电MOSFET控制管脚连接，所述放电MOS开关电路与所述锂电池保护IC芯片的放电MOSFET控制管脚连接；所述指示灯控制电路包括弱电开关SW4、LED驱动模组CT2以及LED开关SW3，所述弱电开关与SW4和所述LED驱动模组CT2与所述锂电池保护IC芯片连接。According to an aspect of the present invention, a lithium battery power protection board is provided, which is composed of a lithium battery control module CT1, a discharge indicator lamp and the above-mentioned indicator control circuit, and the lithium battery control module CT1 includes a lithium battery protection IC. a chip, a charging MOS switch circuit, a discharge MOS switch circuit, and an overvoltage and undervoltage comparison circuit, wherein the lithium battery protection IC chip is connected to the battery pack through the overvoltage and undervoltage comparison circuit, the charging MOS switch circuit and the lithium a charging MOSFET control pin connection of the battery protection IC chip, the discharge MOS switch circuit is connected to a discharge MOSFET control pin of the lithium battery protection IC chip; the indicator control circuit comprises a weak current switch SW4 and an LED driving module CT2 And an LED switch SW3, wherein the weak current switch and the SW4 and the LED driving module CT2 are connected to the lithium battery protection IC chip.
进一步的，所述锂电池控制模组CT1还包括负载与充电检测电路，所述负载与充电检测电路一端与充电器或者负载的负接头连接，另一端与所述锂电池保护IC芯片的充电器检测引脚和负载检测引脚连接。Further, the lithium battery control module CT1 further includes a load and charge detection circuit, the load and the charge detection circuit are connected at one end to a negative connector of the charger or the load, and the other end is connected to the charger of the lithium battery protection IC chip. The sense pin is connected to the load sense pin.
进一步的，所述锂电池控制模组CT1还包括温度检测电路和保护延时电路，所述温度检测电路和所述保护延时电路分别连接所述锂电池保护IC芯片的温度检测引脚和延时引脚。Further, the lithium battery control module CT1 further includes a temperature detecting circuit and a protection delay circuit, and the temperature detecting circuit and the protection delay circuit are respectively connected to the temperature detecting pin and the extension of the lithium battery protection IC chip. Time pin.
进一步的，所述过压欠压比较电路一端连接到锂电池的正极和负极，另一端连接到所述 锂电池保护IC芯片的电芯正端引脚。Further, the overvoltage and undervoltage comparison circuit is connected at one end to the positive and negative terminals of the lithium battery, and at the other end to the positive terminal of the battery of the lithium battery protection IC chip.
本发明的有益效果：The beneficial effects of the invention:
本发明的放电指示灯控制电路及其锂电池电源保护板，将主电流放电回路与小电流放电回路分别控制，实现有效关断LED灯，由于电流回路是并联使用，对主电流回路没有任务影响。与其它同类产品比较为尾灯能有效熄灭，且尾灯在低阻抗的情况下更稳定，相比较于同类产品为高阻抗关闭方式，效果明显。The discharge indicator control circuit and the lithium battery power protection board of the invention respectively control the main current discharge circuit and the small current discharge circuit to realize effective shutdown of the LED lamp. Since the current loop is used in parallel, there is no task impact on the main current loop. . Compared with other similar products, the tail light can be effectively extinguished, and the tail light is more stable under low impedance conditions. Compared with similar products, the high-impedance shutdown mode has obvious effects.
附图说明DRAWINGS
图1为本发明实施例涉及的一种锂电池管理***结构框图；1 is a structural block diagram of a lithium battery management system according to an embodiment of the present invention;
图2为本发明实施例提供的一种放电指示灯控制电路结构框图；2 is a structural block diagram of a discharge indicator control circuit according to an embodiment of the present invention;
图3为本发明实施例提供的一种锂电池电源保护板结构框图；3 is a structural block diagram of a power protection board for a lithium battery according to an embodiment of the present invention;
图4为本发明实施例提供的一种锂电池保护IC芯片引脚图；4 is a pin diagram of a lithium battery protection IC chip according to an embodiment of the present invention;
其中，10-锂电池保护IC芯片，20-充电MOS开关电路、30-放电MOS开关电路、40-指示灯控制电路，50-负载与充电检测电路，60-温度检测电路，70-过压欠压比较电路，80-保护延时电路,90-电池组。Among them, 10-lithium battery protection IC chip, 20-charge MOS switch circuit, 30-discharge MOS switch circuit, 40-indicator control circuit, 50-load and charge detection circuit, 60-temperature detection circuit, 70-overvoltage Pressure comparison circuit, 80-protection delay circuit, 90-battery pack.
本发明目的的实现、功能特点及优点将结合实施例，参照附图做进一步说明。The implementation, functional features, and advantages of the present invention will be further described in conjunction with the embodiments.
具体实施方式Detailed ways
为了使本发明所要解决的技术问题、技术方案及有益效果更加清楚、明白，以下结合附图和实施例，对本发明进行进一步详细说明。应当理解，此处所描述的具体实施例仅仅用以解释本发明，并不用于限定本发明。The present invention will be further described in detail below with reference to the accompanying drawings and embodiments, in order to make the present invention. It is understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
BMS是BATTERY MANAGEMENT SYSTEM的第一个字母简称组合，称之谓电池管理***。俗称之为电池保姆或电池管家；电池管理***(BMS)主要就是为了智能化管理及维护各个电池单元，防止电池出现过充电和过放电，延长电池的使用寿命，监控电池的状态。锂电池组管理***安装在锂电池组的内部，以单片机为控制核心，在实现对各节锂电池能量均衡的同时，还可以实现过充、过放、过流、温度保护及短路保护。通过LCD显示电池组的各种状态，并可以通过预留的通信端口读取各节锂电池的历史性能状态。如图1所示，锂电池智能管理***主要由充电模块、数据采集模块(包括电压、电流、温度数据采集)、均衡模块、电量计算模块、数据显示模块和存储通信模块组成。整个***以单片机为主控制器，通过采集电流信 息，判断出电池组是在充电、放电还是在闲置状态及是否有过流现象，并对其状态做出相应处理。对各节电池电压进行采集分析后，***决定是否启动均衡模块对整个电池组进行能量均衡，同时判断是否有过充或过放现象。温度的采集主要用于***的过温保护。整个***的工作状态、电流、各节电压、剩余电量及温度信息都会通过液晶显示模块实时显示。BMS is the first letter combination of BATTERY MANAGEMENT SYSTEM, which is called battery management system. Commonly known as battery nanny or battery housekeeper; battery management system (BMS) is mainly to intelligently manage and maintain each battery unit, prevent battery overcharge and over discharge, extend battery life, monitor battery status. The lithium battery management system is installed inside the lithium battery pack. With the single-chip microcomputer as the control core, it can realize over-charge, over-discharge, over-current, temperature protection and short-circuit protection while achieving energy balance of each lithium battery. The various states of the battery pack are displayed through the LCD, and the historical performance state of each of the lithium batteries can be read through the reserved communication port. As shown in Figure 1, the lithium battery intelligent management system is mainly composed of a charging module, a data acquisition module (including voltage, current, temperature data acquisition), an equalization module, a power calculation module, a data display module, and a storage communication module. The whole system uses the single-chip microcomputer as the main controller. By collecting the current information, it is judged whether the battery pack is charging, discharging or idle and whether there is overcurrent phenomenon, and the state is correspondingly processed. After collecting and analyzing the battery voltages of each section, the system determines whether to start the equalization module to energy balance the entire battery pack, and at the same time determine whether there is overcharge or overdischarge. Temperature collection is mainly used for over-temperature protection of the system. The working status, current, voltage of each section, remaining power and temperature information of the whole system will be displayed in real time through the LCD module.
实施例1Example 1
如图2所示，本发明的实施例提供了一种放电指示灯控制电路，包括弱电开关SW4、LED驱动模组CT2以及LED开关SW3，所述弱电开关和所述LED驱动模组CT2与锂电池控制模组CT1连接，所述LED开关SW3与放电指示灯以及电池组BY形成回路，所述LED驱动模组CT2与所述LED开关SW3连接。As shown in FIG. 2, an embodiment of the present invention provides a discharge indicator control circuit including a weak current switch SW4, an LED driving module CT2, and an LED switch SW3, the weak current switch and the LED driving module CT2 and lithium. The battery control module CT1 is connected, the LED switch SW3 forms a loop with the discharge indicator lamp and the battery pack BY, and the LED drive module CT2 is connected to the LED switch SW3.
具体地，当SW4闭合时，闭合电压为高电平传输到CT1，CT1发出打开信号传输到驱动模组CT2,CT2发出打开信号驱动LED开关SW3,从而点亮LED放电指示灯LOAD2,当SW4断开时，断开电压为低电平传输到CT1，CT1发出关闭信号传输到驱动模组CT2,CT2发出关闭信号驱动LED开关SW3,从而关闭LED放电指示灯LOAD2,当电池组BY容量用完时，CT1发出电池过放信号传输到驱动模组CT2，CT2发出关闭信号驱动LED开关SW3,从而关闭LED放电指示灯LOAD2,以免电池组由于重度放电而损坏电池组BY。Specifically, when SW4 is closed, the closing voltage is transmitted to CT1 at a high level, CT1 sends an open signal to the driving module CT2, and CT2 issues an open signal to drive the LED switch SW3, thereby illuminating the LED discharging indicator LOAD2, when SW4 is off When open, the disconnection voltage is low level and transmitted to CT1, CT1 sends a shutdown signal to the drive module CT2, and CT2 sends a shutdown signal to drive the LED switch SW3, thereby turning off the LED discharge indicator LOAD2, when the battery pack BY is used up. CT1 sends a battery over-discharge signal to the drive module CT2, and CT2 sends a shutdown signal to drive the LED switch SW3, thereby turning off the LED discharge indicator LOAD2, so as to prevent the battery pack from damaging the battery pack BY due to heavy discharge.
当LED尾灯LOAD2与负载LOAD1两者做为负载LOAD1并联使用，无CT2及SW4,在SW1断开时，CT1会有漏电流造成LOAD2微亮，影响消费者对电池组是否关闭的判断。When the LED taillight LOAD2 and the load LOAD1 are used in parallel as the load LOAD1, there is no CT2 and SW4. When SW1 is disconnected, the leakage current of CT1 causes LOAD2 to be slightly bright, which affects the consumer's judgment on whether the battery pack is turned off.
其中，所述弱电开关SW4一端与所述电池组的负极连接，另一端与所述锂电池控制模组CT1连接。The one end of the weak current switch SW4 is connected to the negative pole of the battery pack, and the other end is connected to the lithium battery control module CT1.
其中，所述弱电开关SW4与一放电开关SW1并联，所述放电开关SW1连接所述锂电池控制模组CT1，所述放电开关SW1、所述电池组以及一负载LOAD1形成一回路。The weak current switch SW4 is connected in parallel with a discharge switch SW1. The discharge switch SW1 is connected to the lithium battery control module CT1. The discharge switch SW1, the battery pack and a load LOAD1 form a loop.
其中，所述弱电开关SW4与一充电开关SW1并联，所述充电开关SW1连接所述锂电池控制模组CT1，所述充电开关SW1、所述电池组以及一充电器CH形成一回路。The power switch SW4 is connected in parallel with a charging switch SW1. The charging switch SW1 is connected to the lithium battery control module CT1. The charging switch SW1, the battery pack and a charger CH form a loop.
可选地，SW1、SW2、SW3、SW4可以是MOS管作为开关器件。LED驱动模组是常规的LED灯驱动电源。Alternatively, SW1, SW2, SW3, and SW4 may be MOS transistors as switching devices. The LED driver module is a conventional LED lamp driver.
实施例2Example 2
根据本发明的一个方面，如图3所示，本发明提供的一种锂电池电源保护板，由锂电池控制模组CT1、放电指示灯LOAD2以及上述的指示灯控制电路40组成，所述锂电池控制模组CT1包括锂电池保护IC芯片10、充电MOS开关电路20、放电MOS开关电路30以及过压欠压 比较电路70，所述锂电池保护IC芯片10通过所述过压欠压比较电路70与电池组90连接，所述充电MOS开关电路20与所述锂电池保护IC芯片10的充电MOSFET控制管脚连接，所述放电MOS开关电路30与所述锂电池保护IC芯片10的放电MOSFET控制管脚连接；所述指示灯控制电路40包括弱电开关SW4、LED驱动模组CT2以及LED开关SW3，所述弱电开关与SW4和所述LED驱动模组CT2与所述锂电池保护IC芯片10连接。According to an aspect of the present invention, as shown in FIG. 3, a lithium battery power protection board provided by the present invention is composed of a lithium battery control module CT1, a discharge indicator LOAD2, and the above indicator control circuit 40, the lithium The battery control module CT1 includes a lithium battery protection IC chip 10, a charging MOS switch circuit 20, a discharge MOS switch circuit 30, and an overvoltage and undervoltage comparison circuit 70, and the lithium battery protection IC chip 10 passes the overvoltage and undervoltage comparison circuit. 70 is connected to a battery pack 90, and the charge MOS switch circuit 20 is connected to a charge MOSFET control pin of the lithium battery protection IC chip 10, and the discharge MOS switch circuit 30 and the discharge MOSFET of the lithium battery protection IC chip 10 The control pin circuit includes a weak switch SW4, an LED drive module CT2, and an LED switch SW3, the weak switch and the SW4, the LED drive module CT2, and the lithium battery protection IC chip 10. connection.
其中，所述锂电池控制模组CT1还包括负载与充电检测电路50，所述负载与充电检测电路50一端与充电器或者负载的负接头连接，另一端与所述锂电池保护IC芯片10的充电器检测引脚和负载检测引脚连接。The lithium battery control module CT1 further includes a load and charge detection circuit 50, and one end of the load and charge detection circuit 50 is connected to a negative connector of a charger or a load, and the other end is protected by the lithium battery protection IC chip 10. The charger sense pin is connected to the load sense pin.
其中，所述锂电池控制模组CT1还包括温度检测电路60和保护延时电路80，所述温度检测电路60和所述保护延时电路80分别连接所述锂电池保护IC芯片10的温度检测引脚和延时引脚。The lithium battery control module CT1 further includes a temperature detecting circuit 60 and a protection delay circuit 80. The temperature detecting circuit 60 and the protection delay circuit 80 respectively connect the temperature detection of the lithium battery protection IC chip 10. Pin and delay pin.
其中，所述过压欠压比较电路70一端连接到锂电池90的正极和负极，另一端连接到所述锂电池保护IC芯片10的电芯正端引脚。The overvoltage and undervoltage comparison circuit 70 is connected at one end to the positive and negative terminals of the lithium battery 90, and at the other end to the positive terminal of the battery of the lithium battery protection IC chip 10.
如图4所示，型号为SH367107的锂电池保护IC芯片引脚图，采用上述型号的锂电池保护IC芯片能够实现电源保护板的构建，当然，不限于上述型号的IC芯片。As shown in FIG. 4, the pin diagram of the lithium battery protection IC chip of the model SH367107, the lithium battery protection IC chip of the above model can realize the construction of the power protection board, and of course, is not limited to the IC chip of the above model.
本发明的放电指示灯控制电路及其锂电池电源保护板，将主电流放电回路与小电流放电回路分别控制，实现有效关断LED灯，由于电流回路是并联使用，对主电流回路没有任务影响，对比现有的通过主电流回路阻抗提高方式来解决LED尾灯的微亮情况。与其它同类产品比较为尾灯能有效熄灭，且尾灯在低阻抗的情况下更稳定，相比较于同类产品为高阻抗关闭方式，效果明显。The discharge indicator control circuit and the lithium battery power protection board of the invention respectively control the main current discharge circuit and the small current discharge circuit to realize effective shutdown of the LED lamp. Since the current loop is used in parallel, there is no task impact on the main current loop. Compared with the existing method of improving the impedance of the main current loop to solve the dimming of the LED taillights. Compared with other similar products, the tail light can be effectively extinguished, and the tail light is more stable under low impedance conditions. Compared with similar products, the high-impedance shutdown mode has obvious effects.
在本发明专利的描述中，需要理解的是，术语“中心”、“纵向”、“横向”、“长度”、“宽度”、“厚度”、“上”、“下”、“前”、“后”、“左”、“右”、“竖直”、“水平”、“顶”、“底”“内”、“外”、“顺时针”、“逆时针”、“轴向”、“径向”、“周向”、“排”、“列”等指示的方位或位置关系为基于附图所示的方位或位置关系，仅是为了便于描述本发明专利和简化描述，而不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作，因此不能理解为对本发明专利新型的限制。In the description of the present patent, it is to be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", “Back”, “Left”, “Right”, “Vertical”, “Horizontal”, “Top”, “Bottom”, “Inside”, “Outside”, “Clockwise”, “Counterclockwise”, “Axial” The orientation or positional relationship of the indications such as "radial", "circumferential", "row", "column" and the like is based on the orientation or positional relationship shown in the drawings, and is merely for convenience of describing the patent and simplified description of the present invention. It is not intended or implied that the device or component referred to must have a particular orientation, is constructed and operated in a particular orientation, and thus is not to be construed as limiting the invention.
此外，术语“第一”、“第二”仅用于描述目的，而不能理解为指示或暗示相对重要性或者隐含指明所指示的技术特征的数量。由此，限定有“第一”、“第二”的特征可以明示或者 隐含地包括至少一个该特征。在本发明专利的描述中，“多个”的含义是至少两个，例如两个，三个等，除非另有明确具体的限定。Moreover, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, features defining "first" and "second" may expressly or implicitly include at least one of the features. In the description of the present invention, the meaning of "a plurality" is at least two, such as two, three, etc., unless specifically defined otherwise.
在发明专利中，除非另有明确的规定和限定，术语“安装”、“相连”、“连接”、“固定”、“固连”等术语应做广义理解，例如，可以是固定连接，也可以是可拆卸连接，或成一体；可以是机械连接，也可以是电连接；可以是直接相连，也可以通过中间媒介间接相连，可以是两个元件内部的连通或两个元件的相互作用关系，除非另有明确的限定。对于本领域的普通技术人员而言，可以根据具体情况理解上述术语在本发明专利中的具体含义。In the invention patents, the terms "installation", "connected", "connected", "fixed", "fixed" and the like shall be understood broadly, and may be, for example, a fixed connection, unless otherwise specifically defined and defined. It can be a detachable connection, or can be integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, which can be the internal connection of two elements or the interaction of two elements. Unless otherwise expressly defined. For those skilled in the art, the specific meanings of the above terms in the patent of the present invention can be understood on a case-by-case basis.
在本发明专利中，除非另有明确的规定和限定，第一特征在第二特征“上”或“下”可以是第一和第二特征直接接触，或第一和第二特征通过中间媒介间接接触。而且，第一特征在第二特征“之上”、“上方”和“上面”可是第一特征在第二特征正上方或斜上方，或仅仅表示第一特征水平高度高于第二特征。第一特征在第二特征“之下”、“下方”和“下面”可以是第一特征在第二特征正下方或斜下方，或仅仅表示第一特征水平高度小于第二特征。In the present invention, the first feature "on" or "under" the second feature may be a direct contact of the first and second features, or the first and second features are passed through an intermediate medium, unless otherwise explicitly defined and defined. Indirect contact. Moreover, the first feature "above", "above" and "above" the second feature may be that the first feature is directly above or above the second feature, or merely that the first feature level is higher than the second feature. The first feature "below", "below" and "below" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely that the first feature level is less than the second feature.

Claims (8)

  1. 一种放电指示灯控制电路，其特征在于，包括弱电开关、LED驱动模组以及LED开关，所述弱电开关和所述LED驱动模组与锂电池控制模组连接，所述LED开关与放电指示灯以及电池组形成回路，所述LED驱动模组与所述LED开关连接。A discharge indicator control circuit, comprising: a weak current switch, an LED drive module, and an LED switch, wherein the weak current switch and the LED drive module are connected to a lithium battery control module, the LED switch and the discharge indicator The lamp and the battery pack form a loop, and the LED drive module is coupled to the LED switch.
  2. 根据权利要求1所述的一种放电指示灯控制电路，其特征在于，所述弱电开关一端与所述电池组的负极连接，另一端与所述锂电池控制模组连接。The discharge lamp control circuit according to claim 1, wherein one end of the weak current switch is connected to a negative pole of the battery pack, and the other end is connected to the lithium battery control module.
  3. 根据权利要求2所述的一种放电指示灯控制电路，其特征在于，所述弱电开关与一放电开关并联，所述放电开关连接所述锂电池控制模组，所述放电开关、所述电池组以及一负载形成一回路。A discharge lamp control circuit according to claim 2, wherein said weak current switch is connected in parallel with a discharge switch, said discharge switch is connected to said lithium battery control module, said discharge switch, said battery The group and a load form a loop.
  4. 根据权利要求2所述的一种放电指示灯控制电路，其特征在于，所述弱电开关与一充电开关并联，所述充电开关连接所述锂电池控制模组，所述充电开关、所述电池组以及一充电器形成一回路。A discharge lamp control circuit according to claim 2, wherein said weak current switch is connected in parallel with a charging switch, said charging switch is connected to said lithium battery control module, said charging switch, said battery The group and a charger form a loop.
  5. 一种锂电池电源保护板，其特征在于，由锂电池控制模组、放电指示灯以及如权利要求1-4任意一项所述的指示灯控制电路组成，所述锂电池控制模组包括锂电池保护IC芯片、充电MOS开关电路、放电MOS开关电路以及过压欠压比较电路，所述锂电池保护IC芯片通过所述过压欠压比较电路与电池组连接，所述充电MOS开关电路与所述锂电池保护IC芯片的充电MOSFET控制管脚连接，所述放电MOS开关电路与所述锂电池保护IC芯片的放电MOSFET控制管脚连接；所述指示灯控制电路包括弱电开关、LED驱动模组以及LED开关，所述弱电开关和所述LED驱动模组与所述锂电池保护IC芯片连接。A lithium battery power protection board, comprising: a lithium battery control module, a discharge indicator lamp, and an indicator light control circuit according to any one of claims 1 to 4, wherein the lithium battery control module comprises lithium a battery protection IC chip, a charging MOS switch circuit, a discharge MOS switch circuit, and an overvoltage and undervoltage comparison circuit, wherein the lithium battery protection IC chip is connected to the battery pack through the overvoltage and undervoltage comparison circuit, and the charging MOS switch circuit and The lithium battery protects the charging MOSFET control pin of the IC chip, and the discharge MOS switch circuit is connected to the discharge MOSFET control pin of the lithium battery protection IC chip; the indicator control circuit includes a weak current switch and an LED driving mode The group and the LED switch, the weak current switch and the LED driving module are connected to the lithium battery protection IC chip.
  6. 根据权利要求5所述的一种锂电池电源保护板，其特征在于，所述锂电池控制模组CT1还包括负载与充电检测电路，所述负载与充电检测电路一端与充电器或者负载的负接头连接，另一端与所述锂电池保护IC芯片的充电器检测引脚和负载检测引脚连接。A lithium battery power source protection board according to claim 5, wherein said lithium battery control module CT1 further comprises a load and charge detection circuit, said load and charge detection circuit having a negative end with a charger or a load The connector is connected, and the other end is connected to the charger detection pin and the load detection pin of the lithium battery protection IC chip.
  7. 根据权利要求5所述的一种锂电池电源保护板，其特征在于，所述锂电池控制模组CT1还包括温度检测电路和保护延时电路，所述温度检测电路和所述保护延时电路分别连接所述锂电池保护IC芯片的温度检测引脚和延时引脚。The lithium battery power protection board according to claim 5, wherein the lithium battery control module CT1 further comprises a temperature detecting circuit and a protection delay circuit, the temperature detecting circuit and the protection delay circuit The temperature detection pin and the delay pin of the lithium battery protection IC chip are respectively connected.
  8. 根据权利要求5所述的一种锂电池电源保护板，其特征在于，所述过压欠压比较电路一端连接到锂电池的正极和负极，另一端连接到所述锂电池保护IC芯片的电芯正端引脚。A lithium battery power source protection board according to claim 5, wherein said overvoltage and undervoltage comparison circuit is connected at one end to a positive electrode and a negative electrode of the lithium battery, and the other end is connected to the lithium battery protection IC chip. Core positive terminal pin.
PCT/CN2018/078081 2018-03-06 2018-03-06 Discharge indicator light control circuit and lithium battery power supply protection board thereof WO2019169541A1 (en)

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