CN200979996Y - An equalization series connection charging circuit of Li-ion battery series - Google Patents
An equalization series connection charging circuit of Li-ion battery series Download PDFInfo
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- CN200979996Y CN200979996Y CN200620140534.5U CN200620140534U CN200979996Y CN 200979996 Y CN200979996 Y CN 200979996Y CN 200620140534 U CN200620140534 U CN 200620140534U CN 200979996 Y CN200979996 Y CN 200979996Y
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Abstract
本实用新型涉及一种锂离子电池组均衡串联充电电路，设置有输入电源部分、锂离子电池组、检测控制部分、均衡执行部分，输入电源部分与锂离子电池组、检测控制部分、均衡执行部分并联连接。本实用新型的锂离子电池组、检测控制部分、均衡执行部分组成一个充电单元，充电单元内的锂离子电池组、检测控制部分、均衡执行部分并联连接，充电单元之间串联连接，全部充电单元与输入电源部分并联连接，充电单元的数量可以为10个。本实用新型与现有技术相比，具有以下优点和效果：结构设计合理，均衡效率高，可扩展性好，成本低，提高了锂离子电池组的利用效率和使用寿命。
The utility model relates to a lithium-ion battery group balanced series charging circuit, which is provided with an input power part, a lithium-ion battery group, a detection control part, and a balanced execution part, and the input power part is connected with the lithium-ion battery group, the detection control part, and the balanced execution part. connected in parallel. The lithium-ion battery pack, the detection control part, and the equalization execution part of the utility model form a charging unit, the lithium-ion battery pack, the detection control part, and the equalization execution part in the charging unit are connected in parallel, the charging units are connected in series, and all the charging units Connected in parallel with the input power supply part, the number of charging units can be 10. Compared with the prior art, the utility model has the following advantages and effects: reasonable structural design, high equilibrium efficiency, good expandability, low cost, and improved utilization efficiency and service life of the lithium-ion battery pack.
Description
技术领域：Technical field:
本实用新型涉及一种均衡串联充电对锂离子电池组能量的充电电路，它主要适用于锂离子电池组在串联充电过程中达到电池能量的均衡。The utility model relates to a charging circuit for equalizing series charging to the energy of lithium-ion battery packs, which is mainly suitable for achieving balance of battery energy in the series charging process of lithium-ion battery packs.
技术背景：technical background:
在笔记本电脑、移动数码产品、移动通信设备、移动DVD以及动力电池等产品领域里锂离子电池组是目前最主要的二次能源，并且在这些领域中多数采用锂离子电池串联的方式以满足产品的需求。受到制造工艺、原材料等等多种因素的影响，串联时锂离子电池组各单元之间不可避免存在一定的差异，同时随着电池充放电次数的增加，这种差异会越来越大，最终导致电池产品的使用寿命大大缩减，一方面锂离子电池组的能量不能充分发挥，浪费了能源，另一方面，也导致了不稳定的因素的存在。因此，对锂离子电池组能量均衡的研究一直是行业内的热点，并提出多种均衡方法。目前行业内流行的均衡方法有如下三种：In the fields of notebook computers, mobile digital products, mobile communication equipment, mobile DVD, and power batteries, lithium-ion battery packs are currently the most important secondary energy source, and most of these fields use lithium-ion batteries in series to meet product requirements. demand. Affected by various factors such as manufacturing process and raw materials, there is inevitably a certain difference between the units of the lithium-ion battery pack when connected in series. As a result, the service life of battery products is greatly reduced. On the one hand, the energy of the lithium-ion battery pack cannot be fully utilized, which wastes energy. On the other hand, it also leads to the existence of unstable factors. Therefore, the research on the energy balance of lithium-ion battery packs has always been a hot spot in the industry, and a variety of equalization methods have been proposed. There are currently three popular equilibrium methods in the industry as follows:
1、基准电压比较法1. Reference voltage comparison method
该方法的主要思路是提供一组对应于串联锂离子电池组的基准电压，利用预先置入均衡电路中的校准软件控制均衡电路中的采样电路进行采样，分别测量各对应节点的电压值，与基准电压值进行比较，获得每一分压电阻的校正参数，存储该组校正参数，在均衡电路采集电压时利用校正参数进行校正。The main idea of this method is to provide a set of reference voltages corresponding to the lithium-ion battery pack in series, use the calibration software pre-built into the equalization circuit to control the sampling circuit in the equalization circuit to sample, measure the voltage value of each corresponding node, and The reference voltage values are compared to obtain the correction parameters of each voltage dividing resistor, the set of correction parameters is stored, and the correction parameters are used for correction when the equalization circuit collects voltage.
采用此方法进行校正，虽然降低了检修时的工作量，但是由于采用基准比较方法，随着串联锂离子电池组单元数目的增多，其累计误差会越来越大，另外也存在着扩展性差的缺陷，其采用软件控制，自耗电较大。Using this method to correct, although the workload during maintenance is reduced, due to the use of the benchmark comparison method, as the number of lithium-ion battery cells in series increases, the cumulative error will become larger and larger, and there is also the problem of poor scalability. The disadvantage is that it is controlled by software, and its self-consumption is relatively large.
2、偶数个串联锂离子电池组的能量均衡法2. Energy balance method for even number of lithium-ion battery packs in series
该方法的主要思路是以偶数个串联锂离子电池组为一组进行均衡，获得该偶数个串联锂离子电池组的正端与负端间电压差的中间值，与该偶数个串联锂离子电池组的中间端点电压进行比较，当中间值电压高于中间端点电压时，对中间端点以上的锂离子电池组进行放电，当中间值电压低于中间端点电压时，对中间端点以下的锂离子电池组进行放电，使得中间端点以上与中间端点以下的锂离子电池组的电量均衡。The main idea of the method is to equalize a group of even-numbered lithium-ion battery packs in series, and obtain the median value of the voltage difference between the positive terminal and the negative terminal of the even-number series-connected lithium-ion battery packs. The middle terminal voltage of the group is compared. When the middle value voltage is higher than the middle terminal voltage, the lithium-ion battery pack above the middle terminal point is discharged. When the middle value voltage is lower than the middle terminal voltage, the lithium-ion battery pack below the middle terminal point is discharged. The battery packs are discharged so that the charge balance of the lithium-ion battery packs above the middle endpoint and below the middle endpoint is achieved.
此方法具有极好的可扩展性，但其适用范围窄(不适用于奇数个串联锂离子电池组单元的能量均衡)，另外仍然存在放电时各个锂离子电池组不均衡的缺陷。This method has excellent scalability, but its scope of application is narrow (it is not suitable for the energy balance of an odd number of Li-ion battery cells in series), and there is still the defect that each Li-ion battery pack is unbalanced during discharge.
3、独立充电法3. Independent charging method
该方法的主要思路是对串联锂离子电池组中的每个锂离子电池组单元进行独立充电。The main idea of the method is to independently charge each Li-ion battery cell in a series-connected Li-ion battery pack.
此方法具有较好的均衡特性，但电路结构复杂，扩展性相对较差，并且对充电回路的一致性要求高，同时成本也偏高。This method has good equalization characteristics, but the circuit structure is complex, the scalability is relatively poor, and the consistency of the charging circuit is high, and the cost is also high.
发明内容：Invention content:
本实用新型所要解决的技术问题是克服现有技术中存在的上述不足，而提供一种锂离子电池组均衡串联充电电路，从而实现各串联锂离子电池组之间的差异缩减到最小，从而提高串联锂离子电池组之间的一致性，达到充分发挥各锂离子电池组能量，提高使用寿命的目的。The technical problem to be solved by the utility model is to overcome the above-mentioned deficiencies in the prior art, and provide a balanced series charging circuit for lithium-ion battery packs, thereby reducing the difference between each series-connected lithium-ion battery packs to a minimum, thereby improving The consistency between the lithium-ion battery packs in series can fully utilize the energy of each lithium-ion battery pack and improve the service life.
本实用新型解决上述技术问题的技术方案是：该锂离子电池组均衡串联充电电路，其特征在于设置有输入电源部分、锂离子电池组、检测控制部分、均衡执行部分，输入电源部分与锂离子电池组、检测控制部分、均衡执行部分并联连接。The technical solution of the utility model to solve the above-mentioned technical problems is: the balanced series charging circuit of the lithium-ion battery pack, which is characterized in that it is provided with an input power supply part, a lithium-ion battery pack, a detection control part, a balanced execution part, an input power supply part and a lithium-ion battery pack. The battery pack, the detection control part, and the equalization execution part are connected in parallel.
本实用新型所述的锂离子电池组、检测控制部分、均衡执行部分组成一个充电单元，充电单元内的锂离子电池组、检测控制部分、均衡执行部分并联连接，充电单元之间串联连接，全部充电单元与输入电源部分并联连接。The lithium-ion battery pack, the detection control part, and the equalization execution part described in the utility model form a charging unit, and the lithium-ion battery pack, the detection control part, and the equalization execution part in the charging unit are connected in parallel, and the charging units are connected in series. The charging unit is connected in parallel with the input power supply section.
本实用新型所述的充电单元为10个。There are 10 charging units described in the utility model.
本实用新型与现有技术相比，具有以下优点和效果：结构设计合理，均衡效率高，可扩展性好，成本低，提高了锂离子电池组的利用效率和使用寿命。Compared with the prior art, the utility model has the following advantages and effects: reasonable structural design, high equilibrium efficiency, good expandability, low cost, and improved utilization efficiency and service life of the lithium-ion battery pack.
附图说明：Description of drawings:
图1为本实用新型实施例的结构示意图。Fig. 1 is a schematic structural view of an embodiment of the utility model.
图2为本实用新型实施例的电路图。Fig. 2 is the circuit diagram of the utility model embodiment.
具体实施方式：Detailed ways:
本实用新型实施例锂离子电池组均衡串联充电电路由锂离子电池组I、检测控制部分II、均衡执行部分III、输入电源部分IV组成，输入电源部分与锂离子电池组I、检测控制部分II、均衡执行部分III并联连接。The balanced series charging circuit of the lithium-ion battery pack in the embodiment of the utility model is composed of a lithium-ion battery pack I, a detection control part II, a balanced execution part III, and an input power supply part IV, and the input power supply part is connected with the lithium-ion battery pack I and the detection control part II , Balanced implementation Part III connected in parallel.
本实用新型实施例的锂离子电池组I、检测控制部分II、均衡执行部分III组成一个充电单元，充电单元内的锂离子电池组I、检测控制部分II、均衡执行部分III并联连接，充电单元之间串联连接，全部充电单元与输入电源部分IV并联连接。The lithium-ion battery pack I, the detection control part II, and the equalization execution part III in the embodiment of the utility model form a charging unit, and the lithium-ion battery pack I, the detection control part II, and the equalization execution part III in the charging unit are connected in parallel, and the charging unit They are connected in series, and all charging units are connected in parallel with the input power supply part IV.
本实用新型实施例的充电单元可根据实际需要和可能性设定，本实施例为10个。锂离子电池组I由一组串联连接的电池B1、B2、Bn-1、Bn组成，此时n＝10。The charging unit of the utility model embodiment can be set according to actual needs and possibility, and the present embodiment is 10. The lithium-ion battery pack I is composed of a group of batteries B1, B2, Bn-1, and Bn connected in series, where n=10.
在输入电源部分IV给锂离子电池组I充电过程中，检测控制部分II实时监测锂离子电池组I中各个串联电池的电压，当检测到锂离子电池组I中的某一单元或多单元电池的电压超过预定阀值(此阀值等于或略大于电池的恒压充电值)时，检测控制部分II发送控制信号给均衡执行部分III，均衡执行部分III启动相应单元电池的分流回路(分流电流小于充电截止电流)，使多余的部分能量从均衡执行部分III消耗。随着充电时间的推移，所有串联电池的电压逐渐升高并达到一致。During the charging process of the lithium-ion battery pack I by the input power supply part IV, the detection control part II monitors the voltage of each series battery in the lithium-ion battery pack I in real time. When a certain unit or multi-unit battery in the lithium-ion battery pack I is detected When the voltage exceeds a predetermined threshold (this threshold is equal to or slightly greater than the constant voltage charging value of the battery), the detection control part II sends a control signal to the equalization execution part III, and the equalization execution part III starts the shunt circuit of the corresponding unit battery (shunt current less than the charging cut-off current), so that the excess energy is consumed from the equalization execution part III. As the charging time goes on, the voltage of all the batteries connected in series gradually increases and reaches the same level.
本实用新型的输入电源部分IV具有恒流/恒压充电功能及电池充满后自动截止功能。本实用新型的检测控制部分II设置有电压检测、状态检测和均衡控制。The input power part IV of the utility model has a constant current/constant voltage charging function and an automatic cut-off function after the battery is fully charged. The detection control part II of the utility model is provided with voltage detection, state detection and equalization control.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101582594B (en) * | 2008-05-16 | 2011-07-27 | 富港电子（东莞）有限公司 | Charging control circuit |
| WO2014067393A1 (en) * | 2012-10-30 | 2014-05-08 | 恩力能源科技（南通）有限公司 | Circuit, method, device, and energy storage system for balancing battery energy |
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- 2006-11-30 CN CN200620140534.5U patent/CN200979996Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101582594B (en) * | 2008-05-16 | 2011-07-27 | 富港电子（东莞）有限公司 | Charging control circuit |
| WO2014067393A1 (en) * | 2012-10-30 | 2014-05-08 | 恩力能源科技（南通）有限公司 | Circuit, method, device, and energy storage system for balancing battery energy |
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Granted publication date: 20071121 Termination date: 20111130 |