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CN202424260U - Lithium battery supply management system - Google Patents

Lithium battery supply management system Download PDF

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Publication number
CN202424260U
CN202424260U CN 201220034657 CN201220034657U CN202424260U CN 202424260 U CN202424260 U CN 202424260U CN 201220034657 CN201220034657 CN 201220034657 CN 201220034657 U CN201220034657 U CN 201220034657U CN 202424260 U CN202424260 U CN 202424260U
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lithium battery
charging
capacitor
protection module
management system
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李卫兵
孙丕雯
胡波
甘红丽
李洪贞
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Binzhou University
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Binzhou University
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Abstract

The utility model provides a technical scheme of a lithium battery supply management system. The battery management system provided by the scheme comprises a charging module, wherein the charging module is connected with a charging protection module, the charging protection module is connected with a microprocessor, the microprocessor is connected with a discharge protection module, the charging protection module is connected with a lithium battery, the discharge protection module is connected with the lithium battery, and a liquid crystal display module is connected with the microprocessor. According to the scheme, the system can carry out charge and discharge control on the lithium battery, therefore, the service life of the battery is prolonged, and the performance of the lithium battery is more stable.

Description

一种锂电池电源管理系统A lithium battery power management system

技术领域 technical field

本实用新型涉及的是一种用于锂电池的电源管理系统。  The utility model relates to a power management system for lithium batteries. the

背景技术 Background technique

 随着电子技术的不断发展,便携式设备也不断涌现,如笔记本电脑、手机和数码相机等,这些产品的性能很大程度上是取决于为其供电的电池的质量上。近年来,随着电池性能的提高,选择低成本,循环寿命长,安全性能好的全新的绿色电池,并且优化电池管理,以提高电池持续供电的能力与使用寿命,成为便携式设备设计的一个重要方向。锂电池以其体积小、重量轻及能量密度高等优点,在这些便携式产品、通信终端等电子产品中得到了广泛的应用。但是在日常生活中,锂电池存在过度充电或者过度放电的情况,影响了锂电池的使用寿命,这是现有技术所存在的不足之处。  With the continuous development of electronic technology, portable devices are also emerging, such as notebook computers, mobile phones and digital cameras, etc., the performance of these products depends largely on the quality of the batteries that power them. In recent years, with the improvement of battery performance, choosing a new green battery with low cost, long cycle life and good safety performance, and optimizing battery management to improve the ability and service life of the battery's continuous power supply have become an important aspect of portable device design. direction. Lithium batteries have been widely used in electronic products such as portable products and communication terminals due to their small size, light weight and high energy density. However, in daily life, the lithium battery is overcharged or overdischarged, which affects the service life of the lithium battery, which is a deficiency in the prior art. the

发明内容 Contents of the invention

本实用新型的目的,就是针对现有技术所存在的不足,而提供一种锂电池电源管理系统的技术方案,该方案的系统可以对锂电池进行充放电控制,延长电池的使用寿命并且使锂电池的性能更加稳定。 The purpose of this utility model is to provide a technical solution of a lithium battery power management system for the deficiencies in the prior art. The performance of the battery is more stable.

本方案是通过如下技术措施来实现的:一种锂电池电源管理系统,包括充电模块,所述的充电模块与充电保护模块连接,所述充电保护模块与一微处理器连接,所述的微处理器与放电保护模块连接,所述的充电保护模块与锂电池连接,所述的放电保护模块与锂电池连接,另外,还有一液晶显示模块与所述的微处理器连接。所述的充电模块包括变压器T,变压器T的输出端设置有桥式整流电路,桥式整流电路输出端的正极与第一电容C1的正极连接,所述的第一电容C1的负极与桥式整流电路的输出端负极连接,第一电容C1的正极与稳压器的Vin引脚连接,稳压器的Vin引脚通过第二电容C1与第一电容C1的负极连接,稳压器的ADJ引脚通过第一滑动变阻器RP1与第一电容C1的负极连接,第一滑动变阻器RP1与第三电容C3并联,所述滑动变阻器RP1的滑动触点与第一电容C1的负极连接,稳压器的ADJ引脚通过第一电阻R1与Vout引脚连接,所述的电阻R1与第一个二极管VD1并联,所述的稳压器的Vin引脚通过第二个二极管VD2与Vout引脚连接,稳压器的Vout引脚通过第四电容C4与第一电容C1的负极连接。所述的稳压器为LM317。所述的微处理器为AT89S52单片机。所述充电保护模块使用DS2770芯片。所述放电保护模块使用DS2720芯片。 This solution is achieved through the following technical measures: a lithium battery power management system, including a charging module, the charging module is connected to a charging protection module, the charging protection module is connected to a microprocessor, and the microprocessor The processor is connected to the discharge protection module, the charging protection module is connected to the lithium battery, the discharge protection module is connected to the lithium battery, and a liquid crystal display module is connected to the microprocessor. The charging module includes a transformer T, the output end of the transformer T is provided with a bridge rectifier circuit, the positive pole of the output end of the bridge rectifier circuit is connected to the positive pole of the first capacitor C1, and the negative pole of the first capacitor C1 is connected to the bridge rectifier circuit. The output end of the circuit is connected to the negative pole, the positive pole of the first capacitor C1 is connected to the Vin pin of the voltage regulator, the Vin pin of the voltage regulator is connected to the negative pole of the first capacitor C1 through the second capacitor C1, and the ADJ lead of the voltage regulator The pin is connected to the negative pole of the first capacitor C1 through the first sliding rheostat RP1, the first sliding rheostat RP1 is connected in parallel with the third capacitor C3, the sliding contact of the sliding rheostat RP1 is connected to the negative pole of the first capacitor C1, and the voltage regulator The ADJ pin is connected to the Vout pin through the first resistor R1, the resistor R1 is connected in parallel with the first diode VD1, and the Vin pin of the voltage regulator is connected to the Vout pin through the second diode VD2 to stabilize The Vout pin of the voltage regulator is connected to the negative pole of the first capacitor C1 through the fourth capacitor C4. The voltage regulator is LM317. Described microprocessor is AT89S52 single-chip microcomputer. The charging protection module uses a DS2770 chip. The discharge protection module uses a DS2720 chip.

本方案的有益效果可根据对上述方案的叙述得知,由于在该方案中有充电模块,可以直接与外界电源连接,给锂电池充电;充电保护模块可以进行充电电流检测,给锂电池预充电,还可以在锂电池充满电后自动断电,保护了锂电池,不会使锂电池过度充电;放电保护模块可以检测锂电池放电电流,还可以对锂电池进行过放电保护,避免了过度放电对锂电池造成损害,微处理器与充电保护模块和放电保护模块的信息交流与控制,并且将当前的充电电流、放电电流和电池电压及电池温度、电池剩余使用时间,当前放电功率、当前电池温度等基本信息通过液晶显示模块显示出来。由此可见,本实用新型与现有技术相比,具有实质性特点和进步,其实施的有益效果也是显而易见的。 The beneficial effect of this scheme can be known according to the narration of the above-mentioned scheme, because there is a charging module in this scheme, it can be directly connected with an external power supply to charge the lithium battery; the charging protection module can detect the charging current and pre-charge the lithium battery. , It can also automatically cut off the power after the lithium battery is fully charged, which protects the lithium battery and will not overcharge the lithium battery; the discharge protection module can detect the discharge current of the lithium battery, and can also perform over-discharge protection on the lithium battery to avoid over-discharge Damage to the lithium battery, the information exchange and control between the microprocessor and the charging protection module and the discharge protection module, and the current charging current, discharging current, battery voltage and battery temperature, remaining battery life, current discharge power, current battery Basic information such as temperature is displayed through the liquid crystal display module. It can be seen that, compared with the prior art, the utility model has substantive features and progress, and the beneficial effects of its implementation are also obvious.

附图说明 Description of drawings

图1为本实用新型具体实施方式的电气原理框图。 Fig. 1 is the electrical principle block diagram of the specific embodiment of the present utility model.

图2为充电模块电路图。 Figure 2 is a circuit diagram of the charging module.

图3为充电保护模块电路图。 Figure 3 is a circuit diagram of the charging protection module.

图4为放电保护模块电路图。 Figure 4 is a circuit diagram of the discharge protection module.

图中,1为充电模块,2为充电保护模块,3为微处理器,4为放电保护模块,5为锂电池,6为液晶显示模块。 In the figure, 1 is a charging module, 2 is a charging protection module, 3 is a microprocessor, 4 is a discharge protection module, 5 is a lithium battery, and 6 is a liquid crystal display module.

具体实施方式 Detailed ways

为能清楚说明本方案的技术特点,下面通过一个具体实施方式,并结合其附图,对本方案进行阐述。 In order to clearly illustrate the technical features of the solution, the solution will be described below through a specific implementation mode combined with the accompanying drawings.

通过附图可以看出,本方案的锂电池电源管理系统,包括充电模块1,所述的充电模块1与充电保护模块2连接,所述充电保护模块2与一微处理器3连接,所述的微处理器3与放电保护模块4连接,所述的充电保护模块2与锂电池5连接,所述的放电保护模块4与锂电池5连接,另外,还有一液晶显示模块与6所述的微处理器3连接。所述的充电模块1包括变压器T,变压器T的输出端设置有桥式整流电路,桥式整流电路输出端的正极与第一电容C1的正极连接,所述的第一电容C1的负极与桥式整流电路的输出端负极连接,第一电容C1的正极与稳压器的Vin引脚连接,稳压器的Vin引脚通过第二电容C1与第一电容C1的负极连接,稳压器的ADJ引脚通过第一滑动变阻器RP1与第一电容C1的负极连接,第一滑动变阻器RP1与第三电容C3并联,所述滑动变阻器RP1的滑动触点与第一电容C1的负极连接,稳压器的ADJ引脚通过第一电阻R1与Vout引脚连接,所述的电阻R1与第一个二极管VD1并联,所述的稳压器的Vin引脚通过第二个二极管VD2与Vout引脚连接,稳压器的Vout引脚通过第四电容C4与第一电容C1的负极连接。所述的稳压器为LM317。所述的微处理器3为AT89S52单片机。所述充电保护模块2使用DS2770芯片。所述放电保护模块4使用DS2720芯片。 As can be seen from the accompanying drawings, the lithium battery power management system of the present solution includes a charging module 1, the charging module 1 is connected to a charging protection module 2, the charging protection module 2 is connected to a microprocessor 3, and the charging protection module 2 is connected to a microprocessor 3. The microprocessor 3 is connected to the discharge protection module 4, the charging protection module 2 is connected to the lithium battery 5, the discharge protection module 4 is connected to the lithium battery 5, and in addition, there is a liquid crystal display module connected to the 6 described Microprocessor 3 is connected. The charging module 1 includes a transformer T, the output end of the transformer T is provided with a bridge rectifier circuit, the positive pole of the output end of the bridge rectifier circuit is connected to the positive pole of the first capacitor C1, and the negative pole of the first capacitor C1 is connected to the bridge rectifier circuit. The output end of the rectifier circuit is connected to the negative pole, the positive pole of the first capacitor C1 is connected to the Vin pin of the voltage regulator, the Vin pin of the voltage regulator is connected to the negative pole of the first capacitor C1 through the second capacitor C1, and the ADJ of the voltage regulator The pin is connected to the negative pole of the first capacitor C1 through the first sliding rheostat RP1, the first sliding rheostat RP1 is connected in parallel with the third capacitor C3, the sliding contact of the sliding rheostat RP1 is connected to the negative pole of the first capacitor C1, and the voltage regulator The ADJ pin is connected to the Vout pin through the first resistor R1, the resistor R1 is connected in parallel with the first diode VD1, and the Vin pin of the voltage regulator is connected to the Vout pin through the second diode VD2, The Vout pin of the voltage regulator is connected to the negative electrode of the first capacitor C1 through the fourth capacitor C4. The voltage regulator is LM317. Described microprocessor 3 is AT89S52 single-chip microcomputer. The charging protection module 2 uses a DS2770 chip. The discharge protection module 4 uses a DS2720 chip.

充电时,充电模块1可以为锂电池5提供电源,充电保护模块2的DS2770芯片并接到充电电路中,充电电流检测端口LS1与LS2内部集成25 MΩ的电流检测电阻,把引脚LS1和引脚LS2的电压差  (VIS=VIS1-VIS2)  作为检测电阻的电压降。正的VIS值表明电池在充电,而负的 VIS表明电池在放电,电流  I=VIS/25MΩ,系统只选取DS2770的VIS的正值,只用此芯片检测充电电路的充电电流,并将数据传输到微处理器,通过液晶显示模块显示出来。DS2770具有涓流充电功能,可恢复已深度放电的电池。如果在VDD检测的电池电压低于1.8V且持续时间大于过压延迟TOVD(TOVD典型值为1.0 s),DS2770芯片在UV端产生一定频率的方波控制导通PNP型三极管VP2,CC端为高电平,截止PNP型三极管VP1从而对电池进行涓流充电即脉冲充电。电池涓流充电后使VDD检测的电池电压达到VLB且持续时间大于过压延迟TOVD(TOVD典型值为1.0 s),系统开始快速充电即转为恒流充电,将UV端至高,截止VP2,CC端置低导通VP1。即可进行恒流充电。当电池电压达到VCV时,则采用脉冲充电技术,在CC变为高电平后,允许CC保持TVCV时长(875ms)的低电平。当电池电压又降至VCV以下,CC又变为低电平。由于CC占空因数变化慢,脉冲充电持续进行,电池电压衰减时间超过13.125s,充电停止。充电电池电压检测端口VIN,应用外接的二只PNP型三极管VP1与VP2和DS2770芯片来实现对单体锂离子或锂聚合物电池充满电自动断电的安全保护功能,电池输出端通过限流电阻R4接到DS2770芯片的电池电压检测VIN端,当电池电压充到满电时(例如4.2V)时,即在VDD检测的电池电压超过电压阈值VOV,且持续时间大于过压延迟TOVD(TOVD典型值为1.0 s),则DS2770关断外部充电控制MOSFET,DS2770芯片就会将UV,CC端至高,切断外接电源对电池的充电,即可以达到充满电自动断电的目的。 When charging, the charging module 1 can provide power for the lithium battery 5, and the DS2770 chip of the charging protection module 2 is connected to the charging circuit. The charging current detection port LS1 and LS2 integrate a 25 MΩ current detection resistor inside, and the pin LS1 and the lead The voltage difference of pin LS2 (VIS=VIS1-VIS2) is used as the voltage drop of the detection resistor. A positive VIS value indicates that the battery is charging, while a negative VIS indicates that the battery is discharging, the current I=VIS/25MΩ, the system only selects the positive value of VIS of DS2770, and only uses this chip to detect the charging current of the charging circuit and transmit the data to the microprocessor and displayed through the liquid crystal display module. The DS2770 features a trickle charge function to restore deeply discharged batteries. If the battery voltage detected by VDD is lower than 1.8V and the duration is longer than the overvoltage delay TOVD (TOVD typical value is 1.0 s), the DS2770 chip generates a square wave with a certain frequency at the UV end to control the conduction of the PNP transistor VP2, and the CC end is High level, cut off the PNP transistor VP1 to trickle charge the battery, that is, pulse charge. After the battery trickle charge, the battery voltage detected by VDD reaches VLB and the duration is longer than the overvoltage delay TOVD (TOVD typical value is 1.0 s), the system starts fast charging and then turns to constant current charging, and the UV terminal is high, and VP2 is cut off, CC Set low to turn on VP1. Constant current charging can be carried out. When the battery voltage reaches VCV, the pulse charging technology is used to allow CC to maintain the low level of TVCV duration (875ms) after CC becomes high level. When the battery voltage drops below VCV again, CC becomes low again. Due to the slow change of the CC duty cycle, the pulse charging continues, and the battery voltage decay time exceeds 13.125s, and the charging stops. The rechargeable battery voltage detection port VIN uses two external PNP transistors VP1 and VP2 and DS2770 chips to realize the safety protection function of automatic power-off for single lithium-ion or lithium polymer batteries. R4 is connected to the battery voltage detection VIN terminal of the DS2770 chip. When the battery voltage is fully charged (for example, 4.2V), the battery voltage detected at VDD exceeds the voltage threshold VOV, and the duration is longer than the overvoltage delay TOVD (TOVD typical value is 1.0 s), then the DS2770 will turn off the external charge control MOSFET, and the DS2770 chip will set the UV and CC terminals to high, cut off the charging of the battery by the external power supply, that is, the purpose of automatic power off when fully charged.

放电时,DS2720芯片也具有电流检测功能并且在二只N沟道VP3与VP4的左方并联电阻R12欧接到DS2720芯片的放电电流检测输入端PLS,即可通过芯片检测出当前的放电电流,并将放电电流信息传送到微处理器,通过液晶显示模块显示出来。锂电池输出端接到DS2720芯片的电流检测输入端PLS,当电路的电流过大,即加在两个MOSFET的电压VDD - VPLS > VOC,并且持续时间超过TOCD(TOCD典型值16 ms)时,芯片就会将DC端关闭,关断外部充电控制和放电控制MOSFET,实现对单体锂离子或锂聚合物电池安全保护,并置位保护寄存器DOC标志,使电池不会因为放电电流过大即负载较小或短路造成电池损害。当电路的输出电流较小即电池电量不足,芯片就会将DC端关闭,关断外部充电控制和放电控制MOSFET,应用外接的二只N沟道VP3与VP4和DS2720芯片来实现对单体锂离子或锂聚合物电池安全保护,使电池不会因为电池电量不足而过度放电造成电池损害。  When discharging, the DS2720 chip also has a current detection function, and the parallel resistor R12 on the left side of the two N-channel VP3 and VP4 is connected to the discharge current detection input terminal PLS of the DS2720 chip, and the current discharge current can be detected through the chip. And the discharge current information is sent to the microprocessor and displayed through the liquid crystal display module. The output terminal of the lithium battery is connected to the current detection input terminal PLS of the DS2720 chip. When the current of the circuit is too large, that is, the voltage VDD - VPLS > VOC applied to the two MOSFETs, and the duration exceeds TOCD (TOCD typical value 16 ms), The chip will turn off the DC terminal, turn off the external charge control and discharge control MOSFETs, realize the safety protection of the single lithium ion or lithium polymer battery, and set the protection register DOC flag, so that the battery will not die due to excessive discharge current. Small load or short circuit causes battery damage. When the output current of the circuit is small, that is, the battery power is insufficient, the chip will turn off the DC terminal, turn off the external charge control and discharge control MOSFETs, and use two external N-channel VP3 and VP4 and DS2720 chips to realize the single lithium battery. Ion or lithium polymer battery safety protection, so that the battery will not cause battery damage due to excessive discharge due to insufficient battery power. the

Claims (6)

1.一种锂电池电源管理系统,其特征是:包括充电模块,所述的充电模块与充电保护模块连接,所述充电保护模块与一微处理器连接,所述的微处理器与放电保护模块连接,所述的充电保护模块与锂电池连接,所述的放电保护模块与锂电池连接,另外,还有一液晶显示模块与所述的微处理器连接。 1. A lithium battery power management system, characterized in that: comprising a charging module, the charging module is connected to a charging protection module, the charging protection module is connected to a microprocessor, and the microprocessor is connected to a discharge protection module The modules are connected, the charging protection module is connected with the lithium battery, the discharge protection module is connected with the lithium battery, and in addition, a liquid crystal display module is connected with the microprocessor. 2.根据权利要求1所述的锂电池电源管理系统,其特征是:所述的充电模块包括变压器T,变压器T的输出端设置有桥式整流电路,桥式整流电路输出端的正极与第一电容C1的正极连接,所述的第一电容C1的负极与桥式整流电路的输出端负极连接,第一电容C1的正极与稳压器的Vin引脚连接,稳压器的Vin引脚通过第二电容C1与第一电容C1的负极连接,稳压器的ADJ引脚通过第一滑动变阻器RP1与第一电容C1的负极连接,第一滑动变阻器RP1与第三电容C3并联,所述滑动变阻器RP1的滑动触点与第一电容C1的负极连接,稳压器的ADJ引脚通过第一电阻R1与Vout引脚连接,所述的电阻R1与第一个二极管VD1并联,所述的稳压器的Vin引脚通过第二个二极管VD2与Vout引脚连接,稳压器的Vout引脚通过第四电容C4与第一电容C1的负极连接。 2. The lithium battery power management system according to claim 1, wherein the charging module includes a transformer T, the output end of the transformer T is provided with a bridge rectifier circuit, and the positive pole of the output end of the bridge rectifier circuit is connected to the first The positive pole of the capacitor C1 is connected, the negative pole of the first capacitor C1 is connected to the negative pole of the output terminal of the bridge rectifier circuit, the positive pole of the first capacitor C1 is connected to the Vin pin of the voltage regulator, and the Vin pin of the voltage regulator passes through The second capacitor C1 is connected to the negative pole of the first capacitor C1, the ADJ pin of the voltage regulator is connected to the negative pole of the first capacitor C1 through the first sliding rheostat RP1, and the first sliding rheostat RP1 is connected in parallel with the third capacitor C3. The sliding contact of the rheostat RP1 is connected to the negative pole of the first capacitor C1, the ADJ pin of the voltage regulator is connected to the Vout pin through the first resistor R1, and the resistor R1 is connected in parallel with the first diode VD1, and the stabilizer The Vin pin of the voltage regulator is connected to the Vout pin through the second diode VD2, and the Vout pin of the voltage regulator is connected to the negative electrode of the first capacitor C1 through the fourth capacitor C4. 3.根据权利要求2所述的锂电池电源管理系统,其特征是:所述的稳压器为LM317。 3. The lithium battery power management system according to claim 2, characterized in that: the voltage regulator is LM317. 4.根据权利要求1所述的锂电池电源管理系统,其特征是:所述的微处理器为AT89S52单片机。 4. The lithium battery power management system according to claim 1, characterized in that: said microprocessor is an AT89S52 single-chip microcomputer. 5.根据权利要求1所述的锂电池电源管理系统,其特征是:所述充电保护模块使用DS2770芯片。 5. The lithium battery power management system according to claim 1, wherein the charging protection module uses a DS2770 chip. 6.根据权利要求1所述的锂电池电源管理系统,其特征是:所述放电保护模块使用DS2720芯片。 6. The lithium battery power management system according to claim 1, wherein the discharge protection module uses a DS2720 chip.
CN 201220034657 2012-02-03 2012-02-03 Lithium battery supply management system Expired - Fee Related CN202424260U (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103001289A (en) * 2012-11-23 2013-03-27 博科能源系统(深圳)有限公司 Solar energy storage power generation system
CN106344375A (en) * 2016-11-01 2017-01-25 芜湖光荣网络科技有限公司 Digitalized wireless charging ultrasonic type health-care cosmetic instrument
CN111404217A (en) * 2020-03-12 2020-07-10 中国科学院光电研究院 A portable energy management circuit and system

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103001289A (en) * 2012-11-23 2013-03-27 博科能源系统(深圳)有限公司 Solar energy storage power generation system
CN106344375A (en) * 2016-11-01 2017-01-25 芜湖光荣网络科技有限公司 Digitalized wireless charging ultrasonic type health-care cosmetic instrument
CN111404217A (en) * 2020-03-12 2020-07-10 中国科学院光电研究院 A portable energy management circuit and system
CN111404217B (en) * 2020-03-12 2024-05-31 中国科学院光电研究院 Portable energy management circuit and system

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