技术领域technical field
本发明涉及一种移动式充电宝电池管理系统的电流均衡控制电路。The invention relates to a current balance control circuit of a mobile power bank battery management system.
背景技术Background technique
针对电动汽车建立的现有基础设施，主要是固定式的，不能灵活移动。在电动汽车的实际使用过程中，由于人为疏忽或设备故障，有时会出现在行驶途中的电动汽车因为电能耗尽而不能继续行驶到充换电点的情况。针对上述意外情况，研制可自由移动式的充电单元为电动汽车补充能源是非常有必要的，因此提出了专为电动汽车供电的移动充电宝的概念。The existing infrastructure established for electric vehicles is mainly fixed and cannot be flexibly moved. In the actual use of electric vehicles, due to human negligence or equipment failure, sometimes the electric vehicles on the way cannot continue to drive to the charging and swapping point due to the exhaustion of power. In view of the above unexpected situation, it is very necessary to develop a freely movable charging unit to supplement energy for electric vehicles, so the concept of a mobile charging treasure specially for electric vehicles is proposed.
移动式充电宝是一种可自由移动的电动汽车的应急电源装置，电池储能单元是移动式充电宝的重要组成部分。由于制作工艺、工作温度、老化等的方面的影响，电池组内单体电池在容量、内阻、端电压等方面不一致。这种不一致性显著影响了动力电池组的寿命、效率和整体容量。The mobile power bank is an emergency power supply device for a freely movable electric vehicle, and the battery energy storage unit is an important part of the mobile power bank. Due to the influence of manufacturing process, working temperature, aging, etc., the single cells in the battery pack are inconsistent in terms of capacity, internal resistance, and terminal voltage. This inconsistency significantly affects the life, efficiency and overall capacity of the traction battery pack.
发明内容Contents of the invention
本发明的目的是克服现有技术的缺陷，提供一种移动式充电宝电池管理系统的电流均衡控制电路，可以实现对串联动力电池组充电过程的均衡控制，使电池组内的电池单元充分地发挥其储能潜能，延长使用寿命，显著改善了移动式充电宝的储能效果和能量转换效率。The purpose of the present invention is to overcome the defects of the prior art, and provide a current balance control circuit of a mobile power bank battery management system, which can realize the balance control of the charging process of the power battery pack in series, so that the battery cells in the battery pack can fully It exerts its energy storage potential, prolongs its service life, and significantly improves the energy storage effect and energy conversion efficiency of the mobile power bank.
实现上述目的的技术方案是：一种移动式充电宝电池管理系统的电流均衡控制电路，用于自动识别电池组中各个电池的个体差异，并自适应调整充电电流，其特征在于，所述电流均衡控制电路包括续流二极管和若干个电流均衡控制单元，所述若干个电流均衡控制单元与电池组中的若干个电池一一对应；所述若干个电池依次串联组成所述电池组；所述续流二极管的负极与电池组的正极相连，所述续流二极管的正极与所述电池组的负极相连；每个所述电流均衡控制单元均包括功率开关、电感和二极管，所述电池的一端、功率开关、电感和电池的另一端依次相连，所述二极管的负极与所述功率开关和电感的相接端相连，所述若干个电流均衡控制单元的二极管依次串联，且最后一个所述电流均衡控制单元的二极管的正极与相应的电池和电感的相接端相连。The technical solution to achieve the above purpose is: a current balance control circuit of a mobile power bank battery management system, which is used to automatically identify the individual differences of each battery in the battery pack, and adaptively adjust the charging current, characterized in that the current The equalization control circuit includes a freewheeling diode and several current equalization control units, and the several current equalization control units are in one-to-one correspondence with the several batteries in the battery pack; the several batteries are sequentially connected in series to form the battery pack; The negative pole of the freewheeling diode is connected to the positive pole of the battery pack, and the positive pole of the freewheeling diode is connected to the negative pole of the battery pack; each of the current balance control units includes a power switch, an inductor and a diode, and one end of the battery , the power switch, the inductance and the other end of the battery are connected in sequence, the cathode of the diode is connected to the phase terminal of the power switch and the inductance, the diodes of the several current balance control units are connected in series in sequence, and the last one of the current The anodes of the diodes of the balance control unit are connected to the corresponding terminals of the battery and the inductor.
本发明的移动式充电宝电池管理系统的电流均衡控制电路，可以实现对串联动力电池组充电过程的均衡控制，使电池组内的电池单元充分地发挥其储能潜能，延长使用寿命，显著改善了移动式充电宝的储能效果和能量转换效率。The current balance control circuit of the mobile charging treasure battery management system of the present invention can realize the balance control of the charging process of the power battery pack in series, so that the battery cells in the battery pack can fully exert their energy storage potential, prolong the service life, and significantly improve the The energy storage effect and energy conversion efficiency of the mobile charging treasure are studied.
附图说明Description of drawings
图1为本发明的移动式充电宝电池管理系统的电流均衡控制电路的电路图；Fig. 1 is the circuit diagram of the current equalization control circuit of the mobile power bank battery management system of the present invention;
图2为移动式充电宝电池管理系统的电池充电控制策略的框图。Fig. 2 is a block diagram of the battery charging control strategy of the mobile power bank battery management system.
具体实施方式detailed description
为了使本技术领域的技术人员能更好地理解本发明的技术方案，下面结合附图对其具体实施方式进行详细地说明：In order to enable those skilled in the art to better understand the technical solution of the present invention, its specific implementation will be described in detail below in conjunction with the accompanying drawings:
充电宝电池组BAT是有由若干电池串联构成，是能量储存的重要元件。为了将能量储存在电池中，需要将市电转换为合适电压水平的直流电，然后通过控制电路根据电池的充电特性，逐步将能量转换为电池内部的化学能。由于电池组有数量较多的电池单元构成，在参数和特性等方面分别存在一定的差异，在电能逐步转换为化学能的过程中，针对电池单元不同点特性度其充电放电过程进行必要控制，对发挥电池的效能，缩短充电时间，提高充电效率具有非常重要的作用。The power bank battery pack BAT is composed of several batteries connected in series, which is an important component of energy storage. In order to store energy in the battery, it is necessary to convert the mains power into direct current at an appropriate voltage level, and then gradually convert the energy into chemical energy inside the battery through the control circuit according to the charging characteristics of the battery. Since the battery pack is composed of a large number of battery cells, there are certain differences in parameters and characteristics. In the process of gradually converting electrical energy into chemical energy, the charging and discharging process must be controlled according to the different characteristics of the battery cells. It plays a very important role in exerting the performance of the battery, shortening the charging time and improving the charging efficiency.
请参阅图1，本发明的最佳实施例，一种移动式充电宝电池管理系统的电流均衡控制电路，包括续流二极管Dn+1和若干个电流均衡控制单元，若干个电流均衡控制单元与电池组中的若干个电池BT1～BTn一一对应；若干个电池BT1～BTn依次串联组成电池组；续流二极管Dn+1的负极与电池组的正极相连，续流二极管Dn+1的正极与电池组的负极相连；每个电流均衡控制单元均包括功率开关、电感和二极管，电池的一端、功率开关、电感和电池的另一端依次相连，二极管的负极与功率开关和电感的相接端相连。电流均衡控制电路主要元器件有：电感L1～Ln、电容C1～Cn、功率开关管Q1～Qn及二极管D1～Dn+1，若干个电流均衡控制单元的二极管D1～Dn依次串联，且最后一个电流均衡控制单元的二极管Dn的正极与相应的电池BTn和电感Ln的相接端相连。Please refer to Fig. 1, the best embodiment of the present invention, a current balance control circuit of a mobile power bank battery management system, including freewheeling diode Dn+1 and several current balance control units, several current balance control units and Several batteries BT1~BTn in the battery pack correspond one by one; several batteries BT1~BTn are connected in series to form a battery pack; the negative pole of the freewheeling diode Dn+1 is connected to the positive pole of the battery pack, and the positive pole of the freewheeling diode Dn+1 is connected to the positive pole of the battery pack. The negative poles of the battery pack are connected; each current balance control unit includes a power switch, an inductor and a diode, one end of the battery, the power switch, the inductor and the other end of the battery are connected in sequence, and the negative pole of the diode is connected to the connecting end of the power switch and the inductor . The main components of the current balance control circuit are: inductors L1~Ln, capacitors C1~Cn, power switch tubes Q1~Qn, and diodes D1~Dn+1. The diodes D1~Dn of several current balance control units are connected in series in sequence, and the last one The anode of the diode Dn of the current balance control unit is connected to the corresponding terminal of the battery BTn and the inductor Ln.
电流均衡控制电路可以实现对成组串联的电池BT1～BTn均衡充电，当与某个电池单元对应的功率开关管导通时，电池单元被旁路，充电电流不流经对应的电池单元，否则将对电池单元充电。系统中设置的二极管起到续流作用，可以避免在回路中形成比较高的反向电压影响损坏电池和充电器件。在实际使用时，可用PWM控制信号对功率开关管的通断进行控制，通过占空比调节各个电池单元充电的快慢，最终维持电池的SOC值之间只存在非常小的差异。The current balance control circuit can realize the balanced charging of the batteries BT1~BTn connected in series. When the power switch tube corresponding to a certain battery unit is turned on, the battery unit is bypassed, and the charging current does not flow through the corresponding battery unit. Otherwise, The battery unit will be charged. The diode set in the system plays the role of freewheeling, which can avoid the formation of a relatively high reverse voltage in the circuit and damage the battery and charging device. In actual use, the PWM control signal can be used to control the on-off of the power switch tube, adjust the charging speed of each battery unit through the duty cycle, and finally maintain only a very small difference between the SOC values of the batteries.
请参阅图2，电池充电控制策略主要以电压差、电压差变化率和单体电池温度作为3个主要输入参数。控制策略以串联电池组单元的平均电压Va作为参考输入，以实际测量的单体电池端电压V作为主要控制参数，PI控制器以端电压V和组内平均电压Va作为输入，输出控制量(PWM信号的占空比)调节充电过程。控制策略首先根据监测的电压差异ev、电压差变化率，在其论域内模糊化，然后根据规则通过模糊运算的方法确定控制器的P、I控制参数。同时单独针对P控制参数，在模糊推理结论基础上进行线性比例修正。Please refer to Figure 2. The battery charging control strategy mainly uses the voltage difference, the rate of change of the voltage difference and the temperature of the single battery as the three main input parameters. The control strategy takes the average voltage Va of the series battery cells as the reference input, and the actual measured terminal voltage V of the single battery as the main control parameter. The PI controller takes the terminal voltage V and the average voltage Va in the group as the input, and outputs the control quantity ( The duty cycle of the PWM signal) regulates the charging process. The control strategy is firstly fuzzified in the field of discourse according to the monitored voltage differenceev and the rate of change of the voltage difference, and then the P and I control parameters of the controller are determined by the fuzzy operation method according to the rules. At the same time, for the P control parameter alone, the linear proportional correction is carried out on the basis of the fuzzy reasoning conclusion.
充电控制模块对单体电池的充电控制策略采用模糊PI控制器的策略，模糊自适应控制策略主要以电压差、电压差变化率和单体电池温度作为三个主要输入参数。电流均衡控制电路采用的模糊PI控制策略，模糊PI控制策略以串联电池组单元的平均电压作为参考输入，以实际测量的单体电池端电压作为主要控制参数，PI控制器以端电压和组内平均电压作为输入，输出控制量(PWM信号的占空比)调节充电过程。控制策略以电压差、电压差变化率和单体电池温度三个主要参数为基础，对PI控制器的系数进行整定。模糊PI控制策略首先根据监测的电压差异、电压差变化率，在其论域内模糊化，然后根据规则通过模糊运算的方法确定控制器的P、I参数。考虑到温度对控制器参数的影响，实际输出的P控制参数在模糊控制的输出参数上做适当修正，具体的经验公式如下：The charging control module adopts the strategy of fuzzy PI controller for the charging control strategy of the single battery. The fuzzy adaptive control strategy mainly uses the voltage difference, the change rate of the voltage difference and the temperature of the single battery as three main input parameters. The current balance control circuit adopts the fuzzy PI control strategy. The fuzzy PI control strategy uses the average voltage of the series battery cells as the reference input, and the actual measured terminal voltage of the single battery as the main control parameter. The PI controller uses the terminal voltage and the internal The average voltage is used as input, and the output control quantity (duty cycle of PWM signal) regulates the charging process. The control strategy is based on the three main parameters of the voltage difference, the rate of change of the voltage difference and the temperature of the single battery, and the coefficients of the PI controller are adjusted. The fuzzy PI control strategy is firstly fuzzified in the field of discourse according to the monitored voltage difference and the rate of change of the voltage difference, and then the P and I parameters of the controller are determined by the method of fuzzy operation according to the rules. Considering the influence of temperature on the controller parameters, the actual output P control parameters are properly corrected on the output parameters of the fuzzy control. The specific empirical formula is as follows:
P＝Pfuzzy(1+k*Δt) (1)P=Pfuzzy (1+k*Δt) (1)
式(1)中，P为实际输出的P控制参数；Pfuzzy为模糊推理获取的控制参数；Δt为单体电池和组内电池单元平均温度之差；k为温度修正系数，随电池种类变化。In formula (1), P is the actual output P control parameter; Pfuzzy is the control parameter obtained by fuzzy reasoning; Δt is the difference between the average temperature of the single battery and the battery cells in the group; k is the temperature correction coefficient, which varies with the battery type .
PI控制器的实际输出计算公式如下：The actual output calculation formula of the PI controller is as follows:
U＝P*α*△V+I*β*∫△V (2)U＝P*α*△V+I*β*∫△V (2)
式(2)中，U为输出的PWM占空比[0％,100％]；△V为电池电压偏差；α,β为PI控制参数换算系数，α,β为常量，在控制器调试阶段根据电池组配置和电池的工艺参数整定。In the formula (2), U is the output PWM duty cycle [0%, 100%]; △V is the battery voltage deviation; α, β are the conversion coefficients of PI control parameters, α, β are constants, in the controller debugging stage It is set according to the configuration of the battery pack and the technical parameters of the battery.
综上所述，本发明的移动式充电宝电池管理系统的电流均衡控制电路，可以实现对串联动力电池组充电过程的均衡控制，使电池组内的电池单元充分地发挥其储能潜能，延长使用寿命，显著改善了移动式充电宝的储能效果和能量转换效率。To sum up, the current balance control circuit of the mobile power bank battery management system of the present invention can realize the balance control of the charging process of the power battery pack in series, so that the battery units in the battery pack can fully exert their energy storage potential and prolong the battery life. The service life has significantly improved the energy storage effect and energy conversion efficiency of the mobile power bank.
本技术领域中的普通技术人员应当认识到，以上的实施例仅是用来说明本发明，而并非用作为对本发明的限定，只要在本发明的实质精神范围内，对以上所述实施例的变化、变型都将落在本发明的权利要求书范围内。Those of ordinary skill in the art should recognize that the above embodiments are only used to illustrate the present invention, rather than as a limitation to the present invention, as long as within the scope of the spirit of the present invention, the above-described embodiments Changes and modifications will fall within the scope of the claims of the present invention.
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710105855.4ACN106849241A (en) | 2017-02-24 | 2017-02-24 | A kind of current balance control circuit of portable charger baby battery management system |
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710105855.4ACN106849241A (en) | 2017-02-24 | 2017-02-24 | A kind of current balance control circuit of portable charger baby battery management system |
| Publication Number | Publication Date |
|---|---|
| CN106849241Atrue CN106849241A (en) | 2017-06-13 |
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710105855.4APendingCN106849241A (en) | 2017-02-24 | 2017-02-24 | A kind of current balance control circuit of portable charger baby battery management system |
| Country | Link |
|---|---|
| CN (1) | CN106849241A (en) |
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102340165A (en)* | 2010-07-26 | 2012-02-01 | 李建国 | Electrodynamic force vehicle power supply management system |
| CN105553026A (en)* | 2016-01-29 | 2016-05-04 | 华南理工大学 | Battery pack electricity equalization circuit and equalization method |
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102340165A (en)* | 2010-07-26 | 2012-02-01 | 李建国 | Electrodynamic force vehicle power supply management system |
| CN105553026A (en)* | 2016-01-29 | 2016-05-04 | 华南理工大学 | Battery pack electricity equalization circuit and equalization method |
| Title |
|---|
| 林佩君: "串联电池组新型均衡充电系统的研究", 《中国优秀硕士学位论文全文数据库工程科技Ⅱ辑》* |
| Publication | Publication Date | Title |
|---|---|---|
| CN104935045B (en) | Battery pack equalization method for energy storage system adopting nickel-series storage batteries | |
| CN102969772B (en) | Full-stage power lithium battery equalization method and device based on absolute chargeable and dischargeable capacity | |
| CN101552479B (en) | A DC step-down circuit | |
| CN102122836B (en) | Charging/discharging active equalization circuit for lithium ion power battery pack | |
| CN106849242A (en) | A kind of charge control module of portable charger baby battery management system | |
| CN109510319B (en) | Energy storage battery system composed of super capacitor, lithium battery and lead-acid battery | |
| CN107733007B (en) | Dual-target direct equalization circuit and equalization method for battery pack | |
| CN103023085B (en) | Independent photovoltaic storage battery grouping management method | |
| CN103944246A (en) | System and method for rapidly charging energy-feedback type lead-acid battery | |
| CN112886666B (en) | A decentralized active equalization method suitable for cascaded lithium battery packs | |
| CN110445205B (en) | DC power supply balance management system and control method | |
| CN102231446A (en) | Method for controlling consistency of power battery pack | |
| US11855465B1 (en) | Full current balancing method of state of charge for energy storage system | |
| CN103560561B (en) | A kind of balanced charge-discharge device of lithium battery management system | |
| CN104578288A (en) | Double-level-bridge-arm series connection storage cell pack efficient equalizer topology circuit and control method thereof | |
| CN109866655A (en) | A kind of distributed battery group balance control system and its control method | |
| CN108011425A (en) | A kind of active equalizer circuit of cell pack and method | |
| CN204835716U (en) | Modular energy storage system | |
| CN103036256A (en) | Transformer scan chain type storage battery equalizing circuit and method | |
| CN106602653B (en) | A kind of lithium ion battery non-dissipative equalizing circuit | |
| CN208257475U (en) | A kind of charging of lithium battery group alternating current-direct current and active equalization circuit | |
| CN108599329B (en) | Battery pack auxiliary device and its working method | |
| CN104300640B (en) | A kind of novel storage battery group charging control circuit and its method | |
| CN106712213A (en) | Battery management system for mobile charger baby | |
| CN104410117A (en) | Topological circuit of charging and discharging equalizer for novel storage battery set and control method thereof |
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication | Application publication date:20170613 | |
| WD01 | Invention patent application deemed withdrawn after publication |