CN106356927B - A kind of lithium battery group SOC balance system and method - Google Patents
A kind of lithium battery group SOC balance system and method Download PDFInfo
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 86
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 86
- 238000000034 method Methods 0.000 title claims abstract description 27
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- 238000010586 diagram Methods 0.000 description 8
- 238000007599 discharging Methods 0.000 description 6
- 238000009826 distribution Methods 0.000 description 3
- 238000004146 energy storage Methods 0.000 description 3
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- H—ELECTRICITY
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- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
- H02J7/0014—Circuits for equalisation of charge between batteries
- H02J7/0016—Circuits for equalisation of charge between batteries using shunting, discharge or bypass circuits
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Abstract
本发明公开了一种锂电池组均衡系统及方法。本发明将锂电池组的均衡问题分为组内均衡和组间均衡两个层次，锂电池分成若干组，分别和双向DC‑DC转换器并联，其输出端相互串联作为直流母线和发电系统的输出端以及负载并联。每组内电池通过双向开关连接，同时并联旁路开关，可实现电池动态接入。根据各组平均SOC分配各组输出电压实现组间均衡。根据组内单体电池SOC控制其动态接入可实现各组内均衡。基于本发明对锂电池组SOC进行均衡，无需额外的均衡电路，避免了能量在电池之间的转移，在充放电过程中自动实现锂电池组的均衡，均衡速度和均衡效率均得到了极大提高。
The invention discloses a lithium battery pack balancing system and method. The invention divides the balancing problem of the lithium battery group into two levels: intra-group balancing and inter-group balancing. Lithium batteries are divided into several groups, which are respectively connected in parallel with bidirectional DC-DC converters, and their output terminals are connected in series as the DC bus and power generation system. The output terminal and the load are connected in parallel. The batteries in each group are connected through a bidirectional switch, and a bypass switch is connected in parallel to realize dynamic battery access. According to the average SOC of each group, the output voltage of each group is distributed to realize the balance between groups. According to the SOC of the single battery in the group, the dynamic connection can be controlled to realize the balance in each group. Based on the invention, the SOC of the lithium battery pack is balanced, no additional equalization circuit is needed, energy transfer between batteries is avoided, and the balance of the lithium battery pack is automatically realized during the charge and discharge process, and the equalization speed and equalization efficiency are greatly improved. improve.
Description
技术领域technical field
本发明属于电池储能技术领域，具体而言，涉及一种锂电池组SOC(State OfCharge)均衡系统及方法。The invention belongs to the technical field of battery energy storage, and in particular relates to a lithium battery pack SOC (State Of Charge) equalization system and method.
技术背景technical background
考虑到化石能源的不可持续性及环境压力的持续增大，人类亟需一种清洁、可持续的替代能源，在此背景下，风能、核能、太阳能获得了广泛关注。在实际应用中，清洁能源产生的能量往往需要储能装置进行存储以满足各种应用场景。锂电池作为一种能量密度高、重量轻，使用寿命相对较长且自放电率低，无记忆效应，高低温适应性强的储能装置，具有良好的发展前景与研究价值，在一些移动设备如电动汽车中得到了广泛应用。Considering the unsustainability of fossil energy and the continuous increase of environmental pressure, human beings urgently need a clean and sustainable alternative energy source. Against this background, wind energy, nuclear energy, and solar energy have attracted widespread attention. In practical applications, the energy generated by clean energy often requires energy storage devices to store it to meet various application scenarios. As an energy storage device with high energy density, light weight, relatively long service life, low self-discharge rate, no memory effect, and high and low temperature adaptability, lithium battery has good development prospects and research value. It is used in some mobile devices Such as electric vehicles have been widely used.
锂电池单体电压一般在3-4V之间，为满足更多的负载需求，一般需串联若干单体电池成锂电池组使用。由于制造过程及使用过程的限制，串联的单体电池之间往往存在不一致性(具体表现在容量和内阻不一致)，从而导致电池组使用过程中各单体放电电流倍率及温度不一致，反过来作为正反馈加剧单体间SOC(State Of Charge)和内阻的不一致。这种差异会使个别单体电池因过充或过放而损坏，影响电池组的整体性能和使用寿命，严重时甚至会引起爆炸。因此，亟需提出一种高效、快速、高精度、鲁棒性好且易实现的均衡结构及算法使串联电池组SOC趋于一致，从而大大延长锂电池组的使用寿命并提高其性能。The voltage of a single lithium battery is generally between 3-4V. In order to meet more load requirements, it is generally necessary to connect several single batteries in series to form a lithium battery pack. Due to the limitations of the manufacturing process and the use process, there are often inconsistencies between the single cells connected in series (specifically, the capacity and internal resistance are inconsistent), which leads to the inconsistency of the discharge current rate and temperature of each cell during the use of the battery pack, and vice versa. As a positive feedback, the inconsistency of SOC (State Of Charge) and internal resistance between monomers is exacerbated. This difference will cause individual single cells to be damaged due to overcharging or overdischarging, affecting the overall performance and service life of the battery pack, and even causing an explosion in severe cases. Therefore, it is urgent to propose an efficient, fast, high-precision, robust and easy-to-implement equalization structure and algorithm to make the SOC of series battery packs tend to be consistent, thereby greatly extending the service life of lithium battery packs and improving their performance.
发明内容Contents of the invention
针对现有技术存在的问题和技术需求，本发明提供一种锂电池组SOC均衡系统及方法，将锂电池组的均衡问题分为组内均衡和组间均衡两个层次，包括根据组间平均SOC为依据的输出电压分配实现组间均衡和组内单体电池SOC为依据控制单体电池动态接入实现组内均衡的均衡方法。基于本发明对锂电池组SOC进行均衡，无需额外的均衡电路，避免了能量在电池组之间的转移，在充放电过程中自动实现锂电池组的均衡，均衡速度和均衡效率均得到了极大提高。Aiming at the existing problems and technical requirements of the prior art, the present invention provides a lithium battery pack SOC balance system and method, which divides the balance problem of lithium battery packs into two levels: intra-group balance and inter-group balance, including SOC-based output voltage distribution to achieve inter-group balance and single battery SOC in the group to control the dynamic connection of single batteries to achieve intra-group balance. Based on the present invention, the SOC of the lithium battery pack is balanced, no additional equalization circuit is needed, the transfer of energy between the battery packs is avoided, and the balance of the lithium battery pack is automatically realized during the charge and discharge process, and the equalization speed and equalization efficiency are extremely high. Great improvement.
为了实现本发明技术目的，本发明提供了如下技术方案：In order to realize the technical purpose of the present invention, the present invention provides following technical scheme:
一种锂电池组SOC均衡系统，包括N组锂电池、N个双向DC-DC转换器和一个采样及控制器；每组锂电池和一个双向DC-DC转换器并联，DC-DC转换器输出端串联后作为直流母线和发电系统的输出端以及负载通过DC-DC输出端并联；采样及控制器的控制端连接双向DC-DC转换器的输入端，采样及控制器的输入端连接双向DC-DC转换器的电压和电流输出端；每组锂电池包含M块单体电池，相邻单体电池通过一个隔离开关进行隔离，每节单体电池并联旁路开关，此旁路开关和对应隔离开关组成开关对，两开关的控制信号互相取反，可动态实现电池接入和断开。A lithium battery SOC balancing system, including N groups of lithium batteries, N bidirectional DC-DC converters and a sampling and controller; each group of lithium batteries is connected in parallel with a bidirectional DC-DC converter, and the DC-DC converter outputs The terminals are connected in series as the DC bus and the output terminal of the power generation system and the load is connected in parallel through the DC-DC output terminal; the control terminal of the sampling and controller is connected to the input terminal of the bidirectional DC-DC converter, and the input terminal of the sampling and controller is connected to the bidirectional DC -Voltage and current output terminals of the DC converter; each group of lithium batteries contains M single cells, adjacent single cells are isolated by an isolation switch, each single cell is connected in parallel with a bypass switch, and the bypass switch and the corresponding The isolating switch forms a switch pair, and the control signals of the two switches are reversed, so that the battery can be connected and disconnected dynamically.
一种基于所述锂电池组SOC均衡系统的锂电池组SOC均衡方法，该方法包括：A lithium battery pack SOC balancing method based on the lithium battery pack SOC balancing system, the method comprising:
组间SOC均衡控制步骤：采集每组锂电池的输出电流I和输出电压V，计算每个锂电池组的平均SOC，以此为依据分配每个锂电池组所并联DC-DC模块的输出电压，从而调节流经各DC-DC输入端的电流，使各锂电池组间的单体电池SOC趋于一致；Inter-group SOC balance control step: collect the output current I and output voltage V of each lithium battery group, calculate the average SOC of each lithium battery group, and allocate the output voltage of each lithium battery group parallel DC-DC module based on this , so as to adjust the current flowing through each DC-DC input terminal, so that the SOC of the single battery among the lithium battery packs tends to be consistent;
组内SOC均衡控制步骤：若锂电池组平均SOC在预定阈值范围外，按照组内SOC均衡原则通过控制开关对的通断从而控制各单体电池的充放电状态，使该组内的单体电池SOC趋于一致，所述组内SOC均衡原则为：计算锂电池组内的各单体电池的SOC，其中SOC高的单体电池接入时间长，SOC低的单体电池接入时间短，使用预测控制算法计算在下一放电周期中各电池放电量最优值使得经过一个放电周期后各单体电池SOC离散程度最小，从而分配组内各单体电池接入的时间，且保证在同一时间接入的电池数不得小于下限值。SOC balance control steps in the group: If the average SOC of the lithium battery group is outside the predetermined threshold range, according to the principle of SOC balance in the group, the charge and discharge state of each single battery is controlled by controlling the on-off of the switch pair, so that the cells in the group The battery SOC tends to be consistent, and the SOC balance principle in the group is: calculate the SOC of each single battery in the lithium battery pack, where the single battery with a high SOC has a long connection time, and the single battery with a low SOC has a short connection time , use the predictive control algorithm to calculate the optimal value of the discharge capacity of each battery in the next discharge cycle so that the SOC of each single battery is the smallest after a discharge cycle, so as to allocate the time for each single battery in the group to be connected, and ensure that it is within the same The number of batteries connected at a time must not be less than the lower limit.
进一步地，组内电池动态接入会导致锂电池组输出电压跳变，基于此，本发明设置任意时刻每个锂电池组内的锂电池组单体接入个数为定值，对组内各单体电池的接入时序通过排序的方法进行排列来保证任意时刻接入锂电池组单体电池个数为定值。Further, the dynamic access of batteries in the group will cause the output voltage of the lithium battery group to jump. Based on this, the present invention sets the number of connected lithium battery cells in each lithium battery group as a fixed value at any time. The access sequence of each single battery is arranged by a sorting method to ensure that the number of single batteries connected to the lithium battery pack is a constant value at any time.
总体而言，通过本发明所构思的以上技术方案与现有技术相比，主要具备以下的技术优点：Generally speaking, compared with the prior art, the above technical solution conceived by the present invention mainly has the following technical advantages:
1.本发明基于电量分配的思想，以SOC为依据动态分配充放电过程中各组电池和组内电池的充放电程度，避免了能量的转移，有效降低了均衡损耗，且均衡速度也得到了提高。1. The present invention is based on the idea of power distribution, dynamically distributes the charge and discharge levels of each group of batteries and batteries in the group during the charging and discharging process based on SOC, avoids the transfer of energy, effectively reduces the equalization loss, and the equalization speed is also obtained. improve.
2.同时，采用分组和分层的思想，将锂电池组的均衡问题分为组内均衡和组间均衡两个层次，简化了系统结构，结合了两种方法的优点，降低了控制难度。2. At the same time, using the idea of grouping and layering, the balance problem of lithium battery packs is divided into two levels: intra-group balance and inter-group balance, which simplifies the system structure, combines the advantages of the two methods, and reduces the difficulty of control.
3.本发明采用的双向开关导通电阻较低，能有效降低导通损耗和系统发热，提高系统整体效率。3. The bidirectional switch used in the present invention has a low conduction resistance, which can effectively reduce conduction loss and system heat generation, and improve the overall efficiency of the system.
附图说明Description of drawings
图1是本发明锂电池组SOC均衡系统结构示意图；Fig. 1 is a schematic structural diagram of a lithium battery pack SOC equalization system of the present invention;
图2是本发明锂电池单体动态接入效果示意图；Fig. 2 is a schematic diagram of the dynamic connection effect of a lithium battery cell in the present invention;
图3是本发明锂电池动态接入时序排列方法示意图；Fig. 3 is a schematic diagram of the lithium battery dynamic access sequence arrangement method of the present invention;
图4是本发明锂电池组均衡结构电路拓扑图。Fig. 4 is a topological diagram of the equalization structure circuit of the lithium battery pack of the present invention.
具体实施方式Detailed ways
为了使本发明的目的、技术方案及优点更加清楚明白，以下结合附图及实施例，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。此外，下面所描述的本发明各个实施方式中所涉及到的技术特征只要彼此之间未构成冲突就可以相互组合。In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not constitute a conflict with each other.
图1所示为本发明锂电池组SOC均衡系统结构示意图。锂电池一共被分为N组，每组包含M块单体电池，锂电池组总的单体电池数为N*M，每组电池为一个模块，每个模块和一个双向DC-DC转换器并联，DC-DC转换器输出端相互串联作为直流母线和发电系统(譬如固体氧化物燃料电池SOFC)的输出端以及负载通过DC-DC输出端并联。采样及控制器的控制端连接双向DC-DC转换器的输入端，采样及控制器的输入端连接双向DC-DC转换器的电压和电流输出端。FIG. 1 is a schematic structural diagram of the SOC equalization system of a lithium battery pack according to the present invention. The lithium battery is divided into N groups, each group contains M single cells, the total number of single cells in the lithium battery group is N*M, each group of batteries is a module, each module and a bidirectional DC-DC converter In parallel connection, the output ends of the DC-DC converters are connected in series as the DC bus and the output end of the power generation system (such as solid oxide fuel cell SOFC), and the load is connected in parallel through the DC-DC output end. The control end of the sampling and controller is connected to the input end of the bidirectional DC-DC converter, and the input end of the sampling and controller is connected to the voltage and current output ends of the bidirectional DC-DC converter.
各锂电池组通过DC-DC输出端串联而非直接串联，流经各DC-DC输出端的电流Imodule相等，故可通过控制DC-DC输出端电压V1、V2……VN从而控制各电池组的充放电电流Iunit#1、Iunit#2……Iunit#N的大小，根据各电池组的平均SOC值可方便输出DC-DC转换器的占空比分配各组输出电压，从而在电池充放电过程中自动调节各组SOC，实现锂电池组间SOC均衡。Each lithium battery pack is connected in series through the DC-DC output terminals instead of directly in series, and the current Imodule flowing through each DC-DC output terminal is equal, so the voltages V 1 , V 2 ... V N of the DC-DC output terminals can be controlled to control each The charge and discharge currents Iunit#1, Iunit#2...Iunit#N of the battery pack can conveniently output the duty cycle of the DC-DC converter to distribute the output voltage of each group according to the average SOC value of each battery pack, so that the battery During the charge and discharge process, the SOC of each group is automatically adjusted to achieve SOC balance among lithium battery groups.
图2是本发明锂电池动态接入效果示意图。各锂电池组内，每节单体电池并非直接串联，而是分别通过隔离开关进行隔离，同时并联旁路开关，此旁路开关和对应隔离开关组成开关对，其控制信号互相取反，可动态实现电池接入。例如，当控制信号g1＝1、时，电流不流过单体电池1，单体电池1在此过程中充放电电流为0，当控制信号g1＝0、时电流流过单体电池1，单体电池1在此过程中充放电电流等于Iunit。每个电池模块内单体电池的数量等于隔离开关的对数。这样可以通过控制隔离开关的通断决定单体电池是否接入电池模块，从而控制每节电池的充放电状态，动态地在充放电过程中使单体电池SOC趋于一致，实现锂电池组内SOC均衡。按照本发明的一个实施例，采用CSD17559Q5N通道MOSFET和SM74611智能旁路二极管反并联代替其自带体二极管形成低压降单向开关，两个单向开关反向串联可组成双向开关。通过分配各组输出电压及动态接入单体电池形成电压的比值控制电池组电流，增加每组内电池数可降低电池组放电电流，从而降低损耗。Fig. 2 is a schematic diagram of the dynamic connection effect of the lithium battery of the present invention. In each lithium battery pack, each single battery is not directly connected in series, but is isolated through an isolation switch, and a bypass switch is connected in parallel. The bypass switch and the corresponding isolation switch form a switch pair, and their control signals are mutually inverted. Dynamically implement battery access. For example, when the control signal g1=1, , the current does not flow through the single battery 1, and the charging and discharging current of the single battery 1 is 0 during this process. When the control signal g1=0, When the current flows through the single battery 1, the charging and discharging current of the single battery 1 is equal to Iunit in this process. The number of single cells in each battery module is equal to the logarithm of the isolating switch. In this way, whether the single battery is connected to the battery module can be determined by controlling the on-off of the isolating switch, thereby controlling the charging and discharging state of each battery, and dynamically making the SOC of the single battery tend to be consistent during the charging and discharging process, so as to realize the internal stability of the lithium battery pack. SOC balance. According to an embodiment of the present invention, a CSD17559Q5N channel MOSFET and an SM74611 intelligent bypass diode are used in antiparallel connection instead of its own body diode to form a low-drop unidirectional switch, and two unidirectional switches can be formed into a bidirectional switch in reverse series. The current of the battery pack is controlled by allocating the output voltage of each group and the ratio of the voltage formed by dynamically connecting the single cells. Increasing the number of batteries in each group can reduce the discharge current of the battery pack, thereby reducing the loss.
控制器通过AD采样得到每组电池电流Iunit、端电压Vunit和温度分布Tunit，其通过一定SOC估计算法(譬如开路电压法及安时积分法)可以估计出各单体电池SOC，并以此为依据输出开关信号，控制如图4所示隔离开关和旁路开关的通断。The controller obtains the current Iunit, the terminal voltage Vunit and the temperature distribution Tunit of each group of batteries through AD sampling. It can estimate the SOC of each single battery through a certain SOC estimation algorithm (such as the open circuit voltage method and the ampere-hour integration method), and use it as According to the output switch signal, control the on-off of the isolating switch and the bypass switch as shown in Fig. 4 .
本发明基于对串联锂电池组分组的思想，将锂电池组的均衡问题分为组内均衡和组间均衡两个层次，在充放电过程中动态地控制单体电池是否接入电池模块中时，会造成电池模块端电压的变化，通过每个模块所并联的双向DC-DC转换器可以方便地调节输出端电压，从而匹配负载功率。Based on the idea of grouping lithium battery packs in series, the present invention divides the balance problem of lithium battery packs into two levels: intra-group balance and inter-group balance, and dynamically controls whether a single battery is connected to a battery module during charging and discharging. , will cause the terminal voltage of the battery module to change, and the bidirectional DC-DC converter connected in parallel to each module can easily adjust the output terminal voltage to match the load power.
在应用本发明进行SOC均衡之前，首先根据外部电源和负载需求确定锂电池模块输出功率，主要为输出电流。充电模式下，锂电池模块输出电流为负，外部电源对锂电池模块充电；放电模式下，锂电池模块输出电流为正，锂电池模块对负载放电。Before applying the present invention to perform SOC equalization, the output power of the lithium battery module, mainly the output current, is firstly determined according to the external power supply and load requirements. In the charge mode, the output current of the lithium battery module is negative, and the external power supply charges the lithium battery module; in the discharge mode, the output current of the lithium battery module is positive, and the lithium battery module discharges the load.
图4是本发明锂电池组均衡结构电路拓扑图。应用本发明进行SOC均衡的具体步骤如下：Fig. 4 is a topological diagram of the equalization structure circuit of the lithium battery pack of the present invention. The specific steps of applying the present invention to carry out SOC equalization are as follows:
步骤1.锂电池一共被分为N组，每组包含M块单体电池，锂电池组总的单体电池数为N*M。确定锂电池模块输出电流I和输出电压V后，计算锂电池模块内每个锂电池组平均SOC，以此为依据分配每个锂电池组所并联DC-DC模块输出电压。Step 1. The lithium battery is divided into N groups, each group contains M single cells, and the total number of single cells in the lithium battery group is N*M. After determining the output current I and output voltage V of the lithium battery module, calculate the average SOC of each lithium battery pack in the lithium battery module, and use this as a basis to allocate the output voltage of the parallel DC-DC modules of each lithium battery pack.
步骤2.当某锂电池组平均SOC处于预定阈值范围(譬如30％-70％)水平时，不进行组内电池均衡，在此范围之外，进行组内电池均衡，其过程如下：计算每个锂电池组内各锂电池SOC，并以此为根据动态控制组内各电池单体接入电池组的时间，SOC较高的电池接入时间长，SOC较低的电池接入时间较短，具体方法为：使用预测控制算法计算在下一放电周期中各电池放电量最优值使得经过一个放电周期后各单体电池SOC离散程度最小，从而分配组内各单体电池接入的时间，且保证在同一时间接入电池数不得小于某下限制(譬如通过电池最大充放电电流计算得到的每组接入最少电池数)，防止损坏电池性能甚至导致安全事故。Step 2. When the average SOC of a certain lithium battery pack is in a predetermined threshold range (such as 30%-70%), the cell balance in the group is not carried out. Outside this range, the cell balance in the group is carried out. The process is as follows: Calculate each The SOC of each lithium battery in a lithium battery pack is used as a basis for dynamically controlling the time for each battery cell in the group to connect to the battery pack. The battery with a higher SOC has a longer connection time, and the battery with a lower SOC has a shorter connection time. , the specific method is: use the predictive control algorithm to calculate the optimal value of the discharge capacity of each battery in the next discharge cycle so that the SOC dispersion of each single battery after a discharge cycle is the smallest, so as to allocate the time for each single battery in the group to connect, And ensure that the number of batteries connected at the same time shall not be less than a certain limit (such as the minimum number of batteries connected to each group calculated by the maximum charge and discharge current of the battery), to prevent damage to battery performance and even lead to safety accidents.
在组内单体电池动态接入电池组情况下，如不加以限制，则该组电池端电压随着接入电池数的变化会出现跳变。作为优化，本发明进一步提供组内电池接入时序控制方法，具体为：设置任意时刻接入锂电池组单体电池个数为定值，对组内各单体电池的接入时序通过排序的方法进行排列来保证任意时刻接入锂电池组单体电池个数为定值。图3为M＝3,放电周期为Tref情况下锂电池动态接入时序排列方法示意图，Tcell1、Tcell2、……Tcell5为各单体电池通过步骤2计算得到在该周期内各单体电池接入时间，λ＝3为任意时刻接入锂电池组单体电池个数。且控制其并联DC-DC模块占空比保持DC-DC模块输出电压稳定且符合步骤2计算结果。In the case that the single cells in the group are dynamically connected to the battery group, if there is no restriction, the battery terminal voltage of the group will jump with the change of the number of connected batteries. As an optimization, the present invention further provides a battery access sequence control method in the group, specifically: set the number of single cells connected to the lithium battery pack at any time as a fixed value, and the sequence of access to each single cell in the group is sorted The method is arranged to ensure that the number of single cells connected to the lithium battery pack is a constant value at any time. Figure 3 is a schematic diagram of the lithium battery dynamic access time sequence arrangement method under the condition of M=3 and the discharge cycle is Tref, Tcell1, Tcell2, ... Tcell5 are calculated by step 2 for each single battery, and the connection of each single battery in this cycle is obtained. Time, λ=3 is the number of single cells connected to the lithium battery pack at any time. And control the duty cycle of its parallel DC-DC modules to keep the output voltage of the DC-DC modules stable and consistent with the calculation results of step 2.
本领域的技术人员容易理解，以上所述仅为本发明的较佳实施例而已，并不用以限制本发明，凡在本发明的精神和原则之内所作的任何修改、等同替换和改进等，均应包含在本发明的保护范围之内。It is easy for those skilled in the art to understand that the above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention, All should be included within the protection scope of the present invention.
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