CN207442455U - A kind of voltage balance circuit for energy-storage system battery module - Google Patents
A kind of voltage balance circuit for energy-storage system battery module Download PDFInfo
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Abstract
本实用新型公开了一种用于储能系统电池模块的电压均衡电路，包括至少两个并联接入电网的电池簇单元、电压均衡单元和电池管理模块，每个电池簇单元与电网之间均串接主继电器K1，所述每个电池簇单元通过电压均衡单元与正负极母线连接，所述电池管理模块分别与主继电器K1和电压均衡单元连接用于控制继电器电源的断开和闭合；所述电池管理模块与每个电池簇单元连接用于采集电池簇单元的电压信息，这样，本实用新型能够实现电池簇内各电池模块以及不同簇内电池模块间快速、高效均衡，可靠性高、成本低，提高电池系统电压一致性，延长系统运行时间与使用寿命。
The utility model discloses a voltage equalization circuit for a battery module of an energy storage system, which comprises at least two battery cluster units connected in parallel to the grid, a voltage equalization unit and a battery management module, and each battery cluster unit is connected to the grid. The main relay K1 is connected in series, each of the battery cluster units is connected to the positive and negative busbars through a voltage equalization unit, and the battery management module is connected to the main relay K1 and the voltage equalization unit to control the disconnection and closure of the relay power supply; The battery management module is connected with each battery cluster unit to collect the voltage information of the battery cluster unit. In this way, the utility model can realize fast, efficient balance between battery modules in the battery cluster and battery modules in different clusters, and high reliability , Low cost, improve battery system voltage consistency, prolong system running time and service life.
Description
技术领域technical field
本实用新型属于锂离子储能电池技术领域，具体涉及一种用于储能系统电池模块的电压均衡电路。The utility model belongs to the technical field of lithium-ion energy storage batteries, in particular to a voltage equalization circuit for battery modules of an energy storage system.
背景技术Background technique
目前，锂离子电池在储能领域的应用越来越广泛，在大型电网级储能领域，储能系统由数量巨大的电池组成，为便于安装与维护，电池系统采用模块化设计，首先由若干单体电池串并联组成电池模块，再由若干电池模块串联组成电池簇，若干电池簇组成电池堆，经过能量转换装置PCS后输出到电网。在电池系统的使用过程中，由于各单体电池的自放电不一致，电池模块、电池簇、电池堆各级管理系统、各级均衡系统以及PCS回路均会消耗电池的电量，进一步造成各电池单元电压不一致。At present, lithium-ion batteries are more and more widely used in the field of energy storage. In the field of large-scale grid-level energy storage, the energy storage system is composed of a large number of batteries. In order to facilitate installation and maintenance, the battery system adopts a modular design. Single batteries are connected in series and parallel to form a battery module, and then several battery modules are connected in series to form a battery cluster, and several battery clusters form a battery stack, which is output to the power grid after passing through the energy conversion device PCS. During the use of the battery system, due to the inconsistent self-discharge of each single battery, battery modules, battery clusters, battery stack management systems at all levels, balancing systems at all levels, and PCS loops will consume battery power, further causing battery cells The voltage is inconsistent.
现有储能系统中，电池模块的单体电池、电池模块之间均有相应的均衡装置，但现有技术仅能对电池模块内部的单体电池进行较有效的均衡，对电池模块、电池簇、电池堆之间的电压均衡效果较差，均衡器的可靠性差，成本高；由于均衡效果不理想，需要对电池模块、电池簇与电池堆进行离线维护，增加维护设备与人员，而且维护的效率较低。In the existing energy storage system, there are corresponding equalization devices between the single cells of the battery module and the battery modules, but the existing technology can only effectively balance the single cells inside the battery module, and the battery modules, batteries The voltage equalization effect between clusters and battery stacks is poor, the reliability of the equalizer is poor, and the cost is high; due to the unsatisfactory equalization effect, offline maintenance of battery modules, battery clusters, and battery stacks is required, increasing maintenance equipment and personnel, and maintenance is less efficient.
实用新型内容Utility model content
为了克服现有技术的不足，本实用新型的目的在于提供一种用于储能系统电池模块的电压均衡电路。In order to overcome the deficiencies of the prior art, the purpose of the utility model is to provide a voltage equalization circuit for a battery module of an energy storage system.
本实用新型提供的一种用于储能系统电池模块的电压均衡电路，其包括至少两个并联接入电网的电池簇单元、电压均衡单元和电池管理模块，每个电池簇单元与电网之间均串接主继电器K1，所述每个电池簇单元通过电压均衡单元与正负极母线连接，所述电池管理模块分别与主继电器K1和电压均衡单元连接用于控制继电器电源的断开和闭合；所述电池管理模块与每个电池簇单元连接用于采集电池簇单元的电压信息。The utility model provides a voltage equalization circuit for a battery module of an energy storage system, which includes at least two battery cluster units connected in parallel to the grid, a voltage equalization unit, and a battery management module. The main relay K1 is connected in series, and each battery cluster unit is connected to the positive and negative bus bars through a voltage equalization unit, and the battery management module is connected to the main relay K1 and the voltage equalization unit to control the opening and closing of the relay power supply ; The battery management module is connected to each battery cluster unit for collecting voltage information of the battery cluster unit.
优选地，所述每个电池簇单元包括能量转换器和至少一个电池模块，所述电池模块的负极与能量转换器的一端连接，所述电池模块的正极与能量转换器的另一端连接，所述电池模块和能量转换器的另一端之间依次串接电池簇总继电器K2和熔断器FU1，所述电池簇总继电器K2与电池管理模块连接；所述至少一个电池模块的正负极与电压均衡单元连接；所述电池管理模块与所述至少一个电池模块连接。Preferably, each battery cluster unit includes an energy converter and at least one battery module, the negative pole of the battery module is connected to one end of the energy converter, and the positive pole of the battery module is connected to the other end of the energy converter, so The battery cluster main relay K2 and the fuse FU1 are sequentially connected in series between the battery module and the other end of the energy converter, and the battery cluster main relay K2 is connected to the battery management module; the positive and negative poles of the at least one battery module are connected to the voltage The balancing unit is connected; the battery management module is connected to the at least one battery module.
优选地，所述电压均衡单元包括正极并联继电器K3、负极并联继电器K4；所述正极并联继电器K3的一端与电池模块的正极连接，另一端接入正极并联母线；所述负极并联继电器K4的一端与电池模块的负极连接，另一端接入负极并联母线；所述电池管理模块分别与主继电器K1、电池簇总继电器K2、所述正极并联继电器K3、负极并联继电器K4连接用于控制继电器电源的断开和闭合。Preferably, the voltage equalization unit includes a positive parallel relay K3 and a negative parallel relay K4; one end of the positive parallel relay K3 is connected to the positive pole of the battery module, and the other end is connected to the positive parallel bus; one end of the negative parallel relay K4 It is connected to the negative pole of the battery module, and the other end is connected to the negative pole parallel busbar; the battery management module is respectively connected to the main relay K1, the battery cluster main relay K2, the positive pole parallel relay K3, and the negative pole parallel relay K4 to control the relay power supply Open and close.
优选地，所述电池模块与正极并联继电器K3之间还串接有限流电阻RC；所述电池模块与负极并联继电器K4之间还串接有熔断器FU2。Preferably, a current limiting resistor RC is connected in series between the battery module and the positive parallel relay K3; a fuse FU2 is also connected in series between the battery module and the negative parallel relay K4.
优选地，所述电池模块包括至少一个相互串联的单体电池。Preferably, the battery module includes at least one single battery connected in series.
优选地，当所述电池模块设置两个或两个以上时，每个电池模块同向顺次串联，相邻两个所述每个电池模块之间串接串联继电器K5，所述串联继电器K5与电池管理模块连接。Preferably, when there are two or more battery modules, each battery module is connected in series in the same direction, and a series relay K5 is connected in series between each of the two adjacent battery modules, and the series relay K5 Connect with battery management module.
优选地，当所述电池簇单元设置两个或两个以上时，相邻两个所述每个电池簇单元的电池模块之间串接电池簇并联继电器K6，所述电池簇并联继电器K6与电池管理模块连接。Preferably, when there are two or more battery cluster units, a battery cluster parallel relay K6 is connected in series between the battery modules of two adjacent battery cluster units, and the battery cluster parallel relay K6 is connected to Battery management module connection.
与现有技术相比，本实用新型提供了一种用于储能系统电池模块的电压均衡电路，其包括至少两个并联接入电网的电池簇单元、电压均衡单元和电池管理模块，每个电池簇单元与电网之间均串接主继电器K1，所述每个电池簇单元通过电压均衡单元与正负极母线连接，所述电池管理模块分别与主继电器K1和电压均衡单元连接用于控制继电器电源的断开和闭合；所述电池管理模块与每个电池簇单元连接用于采集电池簇单元的电压信息，这样，电池管理模块控制主继电器、电池簇继电器断开，控制电池模块的正极并联继电器和负极并联继电器闭合，利用并联电池电压一致的原理，使各电池模块并联均衡，各电池模块电压均衡后采用串联运行，本实用新型能够实现电池簇内各电池模块以及不同簇内电池模块间快速、高效均衡，而且均衡方案可靠性高、成本低，能使电池堆内部各模块电压达到高度一致性，提高电池系统电压一致性，延长系统运行时间与使用寿命。Compared with the prior art, the utility model provides a voltage equalization circuit for a battery module of an energy storage system, which includes at least two battery cluster units connected in parallel to the power grid, a voltage equalization unit and a battery management module, each The main relay K1 is connected in series between the battery cluster unit and the grid, and each battery cluster unit is connected to the positive and negative bus bars through a voltage equalization unit, and the battery management module is connected to the main relay K1 and the voltage equalization unit for controlling The disconnection and closing of the relay power supply; the battery management module is connected with each battery cluster unit to collect the voltage information of the battery cluster unit, so that the battery management module controls the disconnection of the main relay and the battery cluster relay, and controls the positive pole of the battery module The parallel relay and the negative parallel relay are closed, using the principle that the voltage of the parallel battery is consistent, so that each battery module is balanced in parallel, and each battery module is operated in series after the voltage of each battery module is balanced. Fast and efficient equalization, and the equalization scheme has high reliability and low cost, which can achieve a high degree of consistency in the voltage of each module inside the battery stack, improve the voltage consistency of the battery system, and prolong the operating time and service life of the system.
附图说明Description of drawings
图1为本实用新型实施例1提供的一种用于储能系统电池模块的电压均衡电路的电路图；Fig. 1 is a circuit diagram of a voltage equalization circuit for a battery module of an energy storage system provided by Embodiment 1 of the present utility model;
图2为本实用新型实施例2提供的一种用于储能系统电池模块的电压均衡电路的电路图；Fig. 2 is a circuit diagram of a voltage equalization circuit for a battery module of an energy storage system provided by Embodiment 2 of the present utility model;
图3为本实用新型实施例3提供的一种用于储能系统电池模块的电压均衡电路的电路图。Fig. 3 is a circuit diagram of a voltage equalization circuit for a battery module of an energy storage system provided by Embodiment 3 of the present utility model.
附图标记如下：The reference signs are as follows:
1——电池簇单元、2——电压均衡单元、3——能量转换器、4——电池模块、5——正极并联母线、6——负极并联母线。1—Battery Cluster Unit, 2—Voltage Balance Unit, 3—Energy Converter, 4—Battery Module, 5—Positive Parallel Bus, 6—Negative Parallel Bus.
具体实施方式Detailed ways
为了使本实用新型的目的、技术方案及优点更加清楚明白，以下结合实施例，对本实用新型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实用新型，并不用于限定本实用新型。In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model will be further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model, and are not intended to limit the utility model.
本实用新型实施例1提供一种用于储能系统电池模块的电压均衡电路，其电路图，如图1所示，其包括至少两个并联接入电网的电池簇单元1、电压均衡单元2和电池管理模块，每个电池簇单元1与电网之间均串接主继电器K1，所述每个电池簇单元1通过电压均衡单元2与正负极母线连接，所述电池管理模块分别与主继电器K1和电压均衡单元2连接用于控制继电器电源的断开和闭合；所述电池管理模块与每个电池簇单元1连接用于采集电池簇单元1的电压信息；Embodiment 1 of the present utility model provides a voltage equalization circuit for a battery module of an energy storage system. The circuit diagram thereof, as shown in FIG. A battery management module, the main relay K1 is connected in series between each battery cluster unit 1 and the power grid, each battery cluster unit 1 is connected to the positive and negative busbars through a voltage equalization unit 2, and the battery management module is connected to the main relay respectively K1 is connected to the voltage balancing unit 2 for controlling the disconnection and closing of the relay power supply; the battery management module is connected to each battery cluster unit 1 for collecting voltage information of the battery cluster unit 1;
所述每个电池簇单元1包括能量转换器3和至少一个电池模块4，所述电池模块4的负极与能量转换器3的一端连接，所述电池模块4的正极与能量转换器3的另一端连接，所述电池模块4和能量转换器3的另一端之间依次串接电池簇总继电器K2和熔断器FU1，所述电池簇总继电器K2与电池管理模块连接；所述至少一个电池模块4的正负极与电压均衡单元2连接；所述电池管理模块与所述至少一个电池模块4连接。Each battery cluster unit 1 includes an energy converter 3 and at least one battery module 4, the negative pole of the battery module 4 is connected to one end of the energy converter 3, and the positive pole of the battery module 4 is connected to the other end of the energy converter 3. One end is connected, the battery cluster main relay K2 and fuse FU1 are connected in series between the battery module 4 and the other end of the energy converter 3, and the battery cluster main relay K2 is connected to the battery management module; the at least one battery module The positive and negative poles of 4 are connected to the voltage equalization unit 2; the battery management module is connected to the at least one battery module 4.
能量转换器(PCS)是一个双向变流器，将电网的交流电变换为直流给电池充电，将电池的直流电转换为交流电输出给电网。The power converter (PCS) is a bidirectional converter that converts the alternating current of the grid into direct current to charge the battery, and converts the direct current of the battery into alternating current for output to the grid.
其中，所述电压均衡单元2包括正极并联继电器K3、负极并联继电器K4；所述正极并联继电器K3的一端与电池模块4的正极连接，另一端接入正极并联母线5；所述负极并联继电器K4的一端与电池模块4的负极连接，另一端接入负极并联母线6；所述电池管理模块分别与主继电器K1、电池簇总继电器K2、所述正极并联继电器K3、负极并联继电器K4连接用于控制继电器电源的断开和闭合。Wherein, the voltage equalization unit 2 includes a positive parallel relay K3 and a negative parallel relay K4; one end of the positive parallel relay K3 is connected to the positive pole of the battery module 4, and the other end is connected to the positive parallel bus 5; the negative parallel relay K4 One end of the battery module is connected to the negative pole of the battery module 4, and the other end is connected to the negative pole parallel busbar 6; the battery management module is respectively connected to the main relay K1, the battery cluster main relay K2, the positive pole parallel relay K3, and the negative pole parallel relay K4 for Controls the opening and closing of the relay power supply.
电池管理模块用于控制各继电器的断开和闭合。The battery management module is used to control the opening and closing of each relay.
其中，所述电池模块4与正极并联继电器K3之间还串接有限流电阻RC；所述电池模块4与负极并联继电器K4之间还串接有熔断器FU2。Wherein, a current limiting resistor RC is connected in series between the battery module 4 and the positive parallel relay K3; a fuse FU2 is also connected in series between the battery module 4 and the negative parallel relay K4.
为保证电池模块4安全性，各个电池模块4与负极并联母线6之间设置熔断器FU2；为限制正极并联继电器K3闭合瞬间的电流，各个电池模块4与正极并联母线5之间设置限流电阻RC。In order to ensure the safety of the battery module 4, a fuse FU2 is set between each battery module 4 and the negative parallel bus 6; in order to limit the current at the moment when the positive parallel relay K3 is closed, a current-limiting resistor is set between each battery module 4 and the positive parallel bus 5 RC.
其中，所述电池模块4包括至少一个相互串联的单体电池。Wherein, the battery module 4 includes at least one single battery connected in series.
采用该一种用于储能系统电池模块的电压均衡电路均衡电压的方法为：所述电池管理模块采集每个电池簇单元1的电压信息，并且判断所述每个电池簇单元1的电压信息是否相同，如果所述每个电池簇单元1的电压信息不同，所述电池管理模块控制每个电池簇单元1与电网断开，然后所述电池管理模块控制每个电池簇单元1与电压均衡单元2闭合，均衡所述每个电池簇单元1的电压。The method of using the voltage equalization circuit for the battery module of the energy storage system to equalize the voltage is: the battery management module collects the voltage information of each battery cluster unit 1, and judges the voltage information of each battery cluster unit 1 Whether they are the same, if the voltage information of each battery cluster unit 1 is different, the battery management module controls each battery cluster unit 1 to be disconnected from the grid, and then the battery management module controls each battery cluster unit 1 to be connected to the voltage balance Cell 2 is closed, equalizing the voltage of each battery cluster cell 1 .
该方法的具体实施过程为：所述电池管理模块采集每个电池簇单元1中电池模块4的电压信息，并且判断所述电池模块4的电压信息是否相同，如果所述电池模块4的电压信息的电压信息不同，储能系统需要对电池簇单元1中的电池模块4进行均衡时，首先电池管理模块控制能量转换器3与电网之间的主继电器K1断开，然后控制电池簇总继电器K2断开；然后电池管理模块控制各个电池模块4的正极并联继电器K3、负极并联继电器K4闭合，此时，每个电池簇单元1中的电池模块4处于并联状态，完成每个电池簇单元1中电池模块4的电压均衡；电池模块4的电压均衡完成后，首先电池管理模块控制电池模块4的正极并联继电器K3、负极并联继电器K4断开，然后控制电池簇总继电器K2闭合，最后控制能量转换器3与电网之间的主继电器K1闭合，即可以进行串联运行。The specific implementation process of this method is: the battery management module collects the voltage information of the battery modules 4 in each battery cluster unit 1, and judges whether the voltage information of the battery modules 4 is the same, if the voltage information of the battery modules 4 When the energy storage system needs to balance the battery modules 4 in the battery cluster unit 1, the battery management module first controls the main relay K1 between the energy converter 3 and the grid to disconnect, and then controls the battery cluster main relay K2 disconnected; then the battery management module controls the positive parallel relay K3 and the negative parallel relay K4 of each battery module 4 to close, at this time, the battery modules 4 in each battery cluster unit 1 are in a parallel state, completing the Voltage equalization of the battery module 4; after the voltage equalization of the battery module 4 is completed, the battery management module first controls the positive parallel relay K3 and the negative parallel relay K4 of the battery module 4 to be disconnected, then controls the battery cluster main relay K2 to close, and finally controls the energy conversion The main relay K1 between the switch 3 and the power grid is closed, that is, the series operation can be performed.
在如果所述电池模块4的电压信息的电压信息不同，之后，还包括：所述电池管理模块判断每个电池簇单元1中电池模块4的电压是否正常，若所述每个电池簇单元1中电池模块4的电压正常，执行所述电池管理模块控制电压均衡单元2并联每个电池簇单元1的电池模块4，均衡所述每个电池簇单元1中的电池模块4的电压；若所述每个电池簇单元1中电池模块4的电压异常，所述电池管理模块控制电压均衡单元2并联每个电池簇单元1中电压正常的电池模块4。If the voltage information of the voltage information of the battery module 4 is different, after that, it also includes: the battery management module judges whether the voltage of the battery module 4 in each battery cluster unit 1 is normal, if each battery cluster unit 1 The voltage of the battery module 4 in the middle is normal, and the battery management module controls the voltage equalization unit 2 to connect the battery modules 4 of each battery cluster unit 1 in parallel to balance the voltage of the battery modules 4 in each battery cluster unit 1; The voltage of the battery modules 4 in each battery cluster unit 1 is abnormal, and the battery management module controls the voltage equalization unit 2 to connect the battery modules 4 with normal voltage in each battery cluster unit 1 in parallel.
所述电池模块4与电池管理模块连接，电池管理模块能够对电池模块4以及电池模块4中的单体电池的电压进行检测，若电池模块4中有单体电池异常、电池模块4电压超出范围等异常，则该电池模块4与正极并联母线5和负极并联母线6之间的正极并联继电器K3和负极并联继电器K4不闭合，电池管理系统发出提示，该电池模块4可采用人工维护，当电池模块4中有单体电池的电压、电池模块4电压在正常范围内时，则闭合该电池模块4与正极并联母线5和负极并联母线6之间的正极并联继电器K3和负极并联继电器K4，进行储能系统的电压均衡。The battery module 4 is connected to the battery management module, and the battery management module can detect the voltage of the battery module 4 and the battery cells in the battery module 4. If there is an abnormal battery in the battery module 4 and the voltage of the battery module 4 is out of range If the battery module 4 is abnormal, the positive parallel relay K3 and the negative parallel relay K4 between the battery module 4 and the positive parallel bus 5 and the negative parallel bus 6 are not closed, and the battery management system issues a prompt that the battery module 4 can be maintained manually. When there is a single battery voltage in the module 4 and the voltage of the battery module 4 is within the normal range, close the positive parallel relay K3 and the negative parallel relay K4 between the battery module 4 and the positive parallel bus 5 and the negative parallel bus 6 to carry out Voltage equalization of energy storage systems.
本实用新型实施例2提供一种用于储能系统电池模块的电压均衡电路，其电路图，如图2所示，其包括至少两个并联接入电网的电池簇单元1、电压均衡单元2和电池管理模块，每个电池簇单元1与电网之间均串接主继电器K1，所述每个电池簇单元1通过电压均衡单元2与正负极母线连接，所述电池管理模块分别与主继电器K1和电压均衡单元2连接用于控制继电器电源的断开和闭合；所述电池管理模块与每个电池簇单元1连接用于采集电池簇单元1的电压信息。Embodiment 2 of the utility model provides a voltage equalization circuit for a battery module of an energy storage system. The circuit diagram thereof, as shown in FIG. A battery management module, the main relay K1 is connected in series between each battery cluster unit 1 and the power grid, each battery cluster unit 1 is connected to the positive and negative busbars through a voltage equalization unit 2, and the battery management module is connected to the main relay respectively K1 is connected with the voltage balancing unit 2 for controlling the opening and closing of the relay power supply; the battery management module is connected with each battery cluster unit 1 for collecting voltage information of the battery cluster unit 1 .
其中，所述每个电池簇单元1包括能量转换器3和至少一个电池模块4，所述电池模块4的负极与能量转换器3的一端连接，所述电池模块4的正极与能量转换器3的另一端连接，所述电池模块4和能量转换器3的另一端之间依次串接电池簇总继电器K2和熔断器FU1，所述电池簇总继电器K2与电池管理模块连接；所述至少一个电池模块4的正负极与电压均衡单元2连接；所述电池管理模块与所述至少一个电池模块4连接。Wherein, each battery cluster unit 1 includes an energy converter 3 and at least one battery module 4, the negative pole of the battery module 4 is connected to one end of the energy converter 3, and the positive pole of the battery module 4 is connected to the energy converter 3. The other end of the battery module 4 and the other end of the energy converter 3 are connected in series between the battery cluster main relay K2 and the fuse FU1, and the battery cluster main relay K2 is connected to the battery management module; the at least one The positive and negative poles of the battery module 4 are connected to the voltage equalization unit 2 ; the battery management module is connected to the at least one battery module 4 .
能量转换器(PCS)是一个双向变流器，将电网的交流电变换为直流给电池充电，将电池的直流电转换为交流电输出给电网。The power converter (PCS) is a bidirectional converter that converts the alternating current of the grid into direct current to charge the battery, and converts the direct current of the battery into alternating current for output to the grid.
电池管理模块用于控制各继电器的断开和闭合。The battery management module is used to control the opening and closing of each relay.
其中，当所述电池模块4设置两个或两个以上时，每个电池模块4同向顺次串联，相邻两个所述每个电池模块4之间串接串联继电器K5，所述串联继电器K5与电池管理模块连接；每一个电池模块4的正负极与电压均衡单元2。Wherein, when two or more battery modules 4 are provided, each battery module 4 is connected in series in the same direction, and a series relay K5 is connected in series between two adjacent battery modules 4, and the series connection The relay K5 is connected to the battery management module; the positive and negative poles of each battery module 4 are connected to the voltage equalization unit 2 .
其中，所述电池模块4包括至少一个相互串联的单体电池。Wherein, the battery module 4 includes at least one single battery connected in series.
为保证电池管理模块能够对电池模块4以及电池模块4中的单体电池的电压进行检测每一个电池模块4均与电池管理模块连接。In order to ensure that the battery management module can detect the voltage of the battery module 4 and the single cells in the battery module 4, each battery module 4 is connected to the battery management module.
其中，所述电压均衡单元2包括正极并联继电器K3、负极并联继电器K4；所述正极并联继电器K3的一端与电池模块4的正极连接，另一端接入正极并联母线5；所述负极并联继电器K4的一端与电池模块4的负极连接，另一端接入负极并联母线6；所述电池管理模块分别与主继电器K1、电池簇总继电器K2、所述正极并联继电器K3、负极并联继电器K4连接用于控制继电器电源的断开和闭合。Wherein, the voltage equalization unit 2 includes a positive parallel relay K3 and a negative parallel relay K4; one end of the positive parallel relay K3 is connected to the positive pole of the battery module 4, and the other end is connected to the positive parallel bus 5; the negative parallel relay K4 One end of the battery module is connected to the negative pole of the battery module 4, and the other end is connected to the negative pole parallel busbar 6; the battery management module is respectively connected to the main relay K1, the battery cluster main relay K2, the positive pole parallel relay K3, and the negative pole parallel relay K4 for Controls the opening and closing of the relay power supply.
其中，所述电池模块4与正极并联继电器K3之间还串接有限流电阻RC；所述电池模块4与负极并联继电器K4之间还串接有熔断器FU2。Wherein, a current limiting resistor RC is connected in series between the battery module 4 and the positive parallel relay K3; a fuse FU2 is also connected in series between the battery module 4 and the negative parallel relay K4.
为保证电池模块4安全性，各个电池模块4与负极并联母线6之间设置熔断器FU2；为限制正极并联继电器K3闭合瞬间的电流，各个电池模块4与正极并联母线5之间设置限流电阻RC。In order to ensure the safety of the battery module 4, a fuse FU2 is set between each battery module 4 and the negative parallel bus 6; in order to limit the current at the moment when the positive parallel relay K3 is closed, a current-limiting resistor is set between each battery module 4 and the positive parallel bus 5 RC.
采用该一种用于储能系统电池模块的电压均衡电路进行电压均衡的方法为：此时，该电路中所述电池模块4包括两个或两个以上的电池模块4时，所述电池管理模块采集每个电池簇单元1中每个电池模块4的电压信息，并且判断所述每个电池模块4的电压信息是否相同，如果所述每个电池模块4的电压信息的电压信息不同，所述电池管理模块控制主继电器K1、电池簇总继电器K2、串联继电器K5断开，然后所述电池管理模块控制电压均衡单元2中的正极并联继电器K3、负极并联继电器K4闭合，均衡所述每个电池簇单元1的每个电池模块4的电压。The method for voltage equalization by using this voltage equalization circuit for battery modules of an energy storage system is as follows: at this time, when the battery module 4 in the circuit includes two or more battery modules 4, the battery management The module collects the voltage information of each battery module 4 in each battery cluster unit 1, and judges whether the voltage information of each battery module 4 is the same, if the voltage information of the voltage information of each battery module 4 is different, the The battery management module controls the main relay K1, the battery cluster main relay K2, and the series relay K5 to be disconnected, and then the battery management module controls the positive parallel relay K3 and the negative parallel relay K4 in the voltage equalization unit 2 to close to balance each The voltage of each battery module 4 of the battery cluster unit 1 .
该方法的具体实施过程为：所述电池管理模块采集每个电池簇单元1中每个电池模块4的电压信息，并且判断所述每个电池模块4的电压信息是否相同，如果所述每个电池模块4的电压信息的电压信息不同，储能系统需要对电池簇单元1中的每个电池模块4进行均衡时，首先电池管理模块控制能量转换器3与电网之间的主继电器K1断开，然后控制电池簇总继电器K2断开，再断开各电池模块4之间的串联继电器K5；然后电池管理模块控制各个电池模块4的正极并联继电器K3、负极并联继电器K4闭合，此时，每个电池簇单元1中的每个电池模块4处于并联状态，完成每个电池簇单元1中每个电池模块4的电压均衡；电池模块4的电压均衡完成后，首先电池管理模块控制电池模块4的正极并联继电器K3、负极并联继电器K4断开，然后控制各个电池模块4之间的串联继电器K5闭合，再控制电池簇总继电器K2闭合，最后控制能量转换器3与电网之间的主继电器K1闭合，即可以进行串联运行。The specific implementation process of this method is: the battery management module collects the voltage information of each battery module 4 in each battery cluster unit 1, and judges whether the voltage information of each battery module 4 is the same, if each The voltage information of the battery module 4 is different. When the energy storage system needs to balance each battery module 4 in the battery cluster unit 1, the battery management module first controls the main relay K1 between the energy converter 3 and the power grid to be disconnected. , and then control the battery cluster main relay K2 to disconnect, and then disconnect the series relay K5 between each battery module 4; then the battery management module controls the positive parallel relay K3 and the negative parallel relay K4 of each battery module 4 to close, at this time, every Each battery module 4 in a battery cluster unit 1 is in a parallel state, and the voltage balance of each battery module 4 in each battery cluster unit 1 is completed; after the voltage balance of the battery module 4 is completed, the battery management module first controls the battery module 4 The positive pole parallel relay K3 and the negative pole parallel relay K4 are disconnected, then the series relay K5 between each battery module 4 is controlled to close, and then the battery cluster main relay K2 is controlled to close, and finally the main relay K1 between the energy converter 3 and the power grid is controlled Closed, that is, series operation is possible.
判断所述每个电池模块4的电压信息是否相同，之后，还包括：所述电池管理模块判断每个电池簇单元1中电池模块4的电压是否正常，若所述每个电池簇单元1中电池模块4的电压正常，执行所述电池管理模块控制电压均衡单元2并联每个电池簇单元1中的每个电池模块4，均衡所述每个电池簇单元1中的每个电池模块4的电压；若所述每个电池簇单元1中的电池模块4的电压异常，所述电池管理模块控制电压均衡单元2并联每个电池簇单元1中电压正常的电池模块4。Judging whether the voltage information of each of the battery modules 4 is the same, after that, further includes: the battery management module judging whether the voltage of the battery modules 4 in each battery cluster unit 1 is normal, if the battery cluster unit 1 in each battery cluster unit 1 The voltage of the battery module 4 is normal, and the battery management module is executed to control the voltage equalization unit 2 to connect each battery module 4 in each battery cluster unit 1 in parallel to balance the voltage of each battery module 4 in each battery cluster unit 1. Voltage: if the voltage of the battery modules 4 in each battery cluster unit 1 is abnormal, the battery management module controls the voltage equalization unit 2 to connect in parallel the battery modules 4 with normal voltage in each battery cluster unit 1 .
所述电池模块4与电池管理模块连接，电池管理模块能够对电池模块4以及电池模块4中的单体电池的电压进行检测，若电池模块4中有单体电池异常、电池模块4电压超出范围等异常，则该电池模块4与正极并联母线5和负极并联母线6之间的正极并联继电器K3和负极并联继电器K4不闭合，电池管理系统发出提示，该电池模块4可采用人工维护，当电池模块4中有单体电池的电压、电池模块4电压在正常范围内时，则闭合该电池模块4与正极并联母线5和负极并联母线6之间的正极并联继电器K3和负极并联继电器K4，进行储能系统的电压均衡。The battery module 4 is connected to the battery management module, and the battery management module can detect the voltage of the battery module 4 and the battery cells in the battery module 4. If there is an abnormal battery in the battery module 4 and the voltage of the battery module 4 is out of range If the battery module 4 is abnormal, the positive parallel relay K3 and the negative parallel relay K4 between the battery module 4 and the positive parallel bus 5 and the negative parallel bus 6 are not closed, and the battery management system issues a prompt that the battery module 4 can be maintained manually. When there is a single battery voltage in the module 4 and the voltage of the battery module 4 is within the normal range, close the positive parallel relay K3 and the negative parallel relay K4 between the battery module 4 and the positive parallel bus 5 and the negative parallel bus 6 to carry out Voltage equalization of energy storage systems.
本实用新型实施例3提供一种用于储能系统电池模块的电压均衡电路，其电路图，如图3所示，其包括至少两个并联接入电网的电池簇单元1、电压均衡单元2和电池管理模块，每个电池簇单元1与电网之间均串接主继电器K1，所述每个电池簇单元1通过电压均衡单元2与正负极母线连接，所述电池管理模块分别与主继电器K1和电压均衡单元2连接用于控制继电器电源的断开和闭合；所述电池管理模块与每个电池簇单元1连接用于采集电池簇单元1的电压信息。Embodiment 3 of the utility model provides a voltage equalization circuit for a battery module of an energy storage system. The circuit diagram thereof, as shown in FIG. A battery management module, the main relay K1 is connected in series between each battery cluster unit 1 and the power grid, each battery cluster unit 1 is connected to the positive and negative busbars through a voltage equalization unit 2, and the battery management module is connected to the main relay respectively K1 is connected with the voltage balancing unit 2 for controlling the opening and closing of the relay power supply; the battery management module is connected with each battery cluster unit 1 for collecting voltage information of the battery cluster unit 1 .
所述每个电池簇单元1包括能量转换器3和至少一个电池模块4，所述电池模块4的负极与能量转换器3的一端连接，所述电池模块4的正极与能量转换器3的另一端连接，所述电池模块4和能量转换器3的另一端之间依次串接电池簇总继电器K2和熔断器FU1，所述电池簇总继电器K2与电池管理模块连接；所述至少一个电池模块4的正负极与电压均衡单元2连接；所述电池管理模块与所述至少一个电池模块4连接。Each battery cluster unit 1 includes an energy converter 3 and at least one battery module 4, the negative pole of the battery module 4 is connected to one end of the energy converter 3, and the positive pole of the battery module 4 is connected to the other end of the energy converter 3. One end is connected, the battery cluster main relay K2 and fuse FU1 are connected in series between the battery module 4 and the other end of the energy converter 3, and the battery cluster main relay K2 is connected to the battery management module; the at least one battery module The positive and negative poles of 4 are connected to the voltage equalization unit 2; the battery management module is connected to the at least one battery module 4.
能量转换器(PCS)是一个双向变流器，将电网的交流电变换为直流给电池充电，将电池的直流电转换为交流电输出给电网。The power converter (PCS) is a bidirectional converter that converts the alternating current of the grid into direct current to charge the battery, and converts the direct current of the battery into alternating current for output to the grid.
其中，当所述电池簇单元1设置两个或两个以上时，相邻两个所述每个电池簇单元1的电池模块4之间串接电池簇并联继电器K6，所述电池簇并联继电器K6与电池管理模块连接；Wherein, when two or more battery cluster units 1 are provided, a battery cluster parallel relay K6 is connected in series between the battery modules 4 of two adjacent battery cluster units 1, and the battery cluster parallel relay K6 K6 is connected with the battery management module;
其中，当所述每个电池簇单元1中电池模块4设置两个或两个以上时，每个电池模块4同向顺次串联，相邻两个所述每个电池模块4之间串接串联继电器K5，所述串联继电器K5与电池管理模块连接；每一个电池模块4的正负极与电压均衡单元2。Wherein, when two or more battery modules 4 are provided in each battery cluster unit 1, each battery module 4 is connected in series in the same direction, and two adjacent battery modules 4 are connected in series. The series relay K5 is connected to the battery management module; the positive and negative poles of each battery module 4 are connected to the voltage equalization unit 2 .
其中，所述电池模块4包括至少一个相互串联的单体电池。Wherein, the battery module 4 includes at least one single battery connected in series.
为保证电池管理模块能够对电池模块4以及电池模块4中的单体电池的电压进行检测每一个电池模块4均与电池管理模块连接。In order to ensure that the battery management module can detect the voltage of the battery module 4 and the single cells in the battery module 4, each battery module 4 is connected to the battery management module.
其中，所述电压均衡单元2包括正极并联继电器K3、负极并联继电器K4；所述正极并联继电器K3的一端与电池模块4的正极连接，另一端接入正极并联母线5；所述负极并联继电器K4的一端与电池模块4的负极连接，另一端接入负极并联母线6；所述电池管理模块分别与主继电器K1、电池簇总继电器K2、所述正极并联继电器K3、负极并联继电器K4连接用于控制继电器电源的断开和闭合。Wherein, the voltage equalization unit 2 includes a positive parallel relay K3 and a negative parallel relay K4; one end of the positive parallel relay K3 is connected to the positive pole of the battery module 4, and the other end is connected to the positive parallel bus 5; the negative parallel relay K4 One end of the battery module is connected to the negative pole of the battery module 4, and the other end is connected to the negative pole parallel busbar 6; the battery management module is respectively connected to the main relay K1, the battery cluster main relay K2, the positive pole parallel relay K3, and the negative pole parallel relay K4 for Controls the opening and closing of the relay power supply.
电池管理模块用于控制各继电器的断开和闭合。The battery management module is used to control the opening and closing of each relay.
其中，所述电池模块4与正极并联继电器K3之间还串接有限流电阻RC；所述电池模块4与负极并联继电器K4之间还串接有熔断器FU2。Wherein, a current limiting resistor RC is connected in series between the battery module 4 and the positive parallel relay K3; a fuse FU2 is also connected in series between the battery module 4 and the negative parallel relay K4.
为保证电池模块4安全性，各个电池模块4与负极并联母线6之间设置熔断器FU2；为限制正极并联继电器K3闭合瞬间的电流，各个电池模块4与正极并联母线5之间设置限流电阻RC。In order to ensure the safety of the battery module 4, a fuse FU2 is set between each battery module 4 and the negative parallel bus 6; in order to limit the current at the moment when the positive parallel relay K3 is closed, a current-limiting resistor is set between each battery module 4 and the positive parallel bus 5 RC.
采用如实施例3所述的一种用于储能系统电池模块的电压均衡电路进行电压均衡的方法为：该电路中当所述电池簇单元1设置两个或两个以上时，当所述每个电池簇单元1的电池模块4包括两个或两个以上的电池模块4时；该方法具体为：所述电池管理模块采集每个电池簇单元1中每个电池模块4的电压信息，并且判断所述每个电池模块4的电压信息是否相同，如果所述每个电池模块4的电压信息的电压信息不同，所述电池管理模块控制主继电器K1、电池簇总继电器K2、串联继电器K5断开，然后所述电池管理模块控制电压均衡单元2中的正极并联继电器K3、负极并联继电器K4闭合，均衡所述每个电池簇单元1的每个电池模块4的电压；均衡所述每个电池簇单元1的每个电池模块4的电压，之后，还包括：所述电池管理模块控制电池簇并联继电器K6闭合，均衡所述不同电池簇单元1中每个电池模块4的电压。A voltage equalization method using a voltage equalization circuit for battery modules of an energy storage system as described in Embodiment 3 is as follows: in the circuit, when two or more battery cluster units 1 are provided, when the When the battery module 4 of each battery cluster unit 1 includes two or more battery modules 4; the method specifically includes: the battery management module collects the voltage information of each battery module 4 in each battery cluster unit 1, And judge whether the voltage information of each battery module 4 is the same, if the voltage information of the voltage information of each battery module 4 is different, the battery management module controls the main relay K1, the battery cluster main relay K2, and the series relay K5 disconnected, and then the battery management module controls the positive parallel relay K3 and the negative parallel relay K4 in the voltage equalization unit 2 to close to equalize the voltage of each battery module 4 of each battery cluster unit 1; The voltage of each battery module 4 of the battery cluster unit 1, after that, further includes: the battery management module controls the closing of the battery cluster parallel relay K6 to equalize the voltage of each battery module 4 in the different battery cluster units 1 .
该方法的具体实施过程为：该方法的具体实施过程为：所述电池管理模块采集每个电池簇单元1中每个电池模块4的电压信息，并且判断所述每个电池模块4的电压信息是否相同，如果所述每个电池模块4的电压信息的电压信息不同，储能系统需要对电池簇单元1中的每个电池模块4进行均衡时，首先电池管理模块控制能量转换器3与电网之间的主继电器K1断开，然后控制电池簇总继电器K2断开，再断开各电池模块4之间的串联继电器K5；然后电池管理模块控制各个电池模块4的正极并联继电器K3、负极并联继电器K4闭合，此时，每个电池簇单元1中的每个电池模块4处于并联状态，完成每个电池簇单元1中每个电池模块4的电压均衡；之后，储能系统需要对相互并联的电池簇单元1的电池模块进行均衡时，闭合相邻电池簇单元1之间的电池簇并联继电器K6，此时，相邻电池簇单元1中的各个电池模块4均处于并联状态，完成不同电池簇单元1中各个电池模块4的电压均衡，从而使不同电池簇单元1之间的电压达到一致；均衡每个电池簇单元1的电压后，首先，控制相邻电池簇单元1之间的电池簇并联继电器K6断开，电池管理模块控制电池模块4的正极并联继电器K3、负极并联继电器K4断开，然后控制各个电池模块4之间的串联继电器K5闭合，再控制电池簇总继电器K2闭合，最后控制能量转换器3与电网之间的主继电器K1闭合，即可以进行串联运行。The specific implementation process of the method is: the specific implementation process of the method is: the battery management module collects the voltage information of each battery module 4 in each battery cluster unit 1, and judges the voltage information of each battery module 4 Whether they are the same, if the voltage information of the voltage information of each battery module 4 is different, when the energy storage system needs to balance each battery module 4 in the battery cluster unit 1, the battery management module first controls the energy converter 3 and the power grid The main relay K1 between them is disconnected, and then the main relay K2 of the battery cluster is controlled to disconnect, and then the series relay K5 between each battery module 4 is disconnected; then the battery management module controls the positive parallel relay K3 of each battery module 4, and the negative parallel relay K3 Relay K4 is closed. At this time, each battery module 4 in each battery cluster unit 1 is in a parallel state, and the voltage balance of each battery module 4 in each battery cluster unit 1 is completed; after that, the energy storage system needs to be connected in parallel with each other. When balancing the battery modules of the battery cluster unit 1, close the battery cluster parallel relay K6 between the adjacent battery cluster units 1. At this time, each battery module 4 in the adjacent battery cluster unit 1 is in a parallel state, completing The voltage of each battery module 4 in the battery cluster unit 1 is balanced, so that the voltages between different battery cluster units 1 are consistent; after equalizing the voltage of each battery cluster unit 1, first, control the voltage between adjacent battery cluster units 1 The battery cluster parallel relay K6 is disconnected, the battery management module controls the positive parallel relay K3 and the negative parallel relay K4 of the battery module 4 to be disconnected, then controls the series relay K5 between each battery module 4 to close, and then controls the battery cluster main relay K2 to close , and finally control the main relay K1 between the energy converter 3 and the grid to close, that is, the series operation can be performed.
所述电池管理模块采集每个电池簇单元1中每个电池模块4的电压信息，并且判断所述每个电池模块4的电压信息是否相同，之后，还包括：所述电池管理模块判断每个电池簇单元1中每个电池模块4的电压是否正常，若所述每个电池簇单元1中每个电池模块4的电压正常，执行所述电池管理模块控制电压均衡单元2并联每个电池簇单元1中的每个电池模块4，均衡所述每个电池簇单元1中的每个电池模块4的电压；若所述每个电池簇单元1中的电池模块4的电压异常，所述电池管理模块控制电压均衡单元2并联每个电池簇单元1中电压正常的电池模块4。The battery management module collects the voltage information of each battery module 4 in each battery cluster unit 1, and judges whether the voltage information of each battery module 4 is the same, and then, further includes: the battery management module judges that each Whether the voltage of each battery module 4 in the battery cluster unit 1 is normal, if the voltage of each battery module 4 in each battery cluster unit 1 is normal, execute the battery management module to control the voltage equalization unit 2 to connect each battery cluster in parallel each battery module 4 in the unit 1, balance the voltage of each battery module 4 in each battery cluster unit 1; if the voltage of each battery module 4 in each battery cluster unit 1 is abnormal, the battery The management module controls the voltage balancing unit 2 to connect in parallel the battery modules 4 with normal voltage in each battery cluster unit 1 .
所述电池模块4与电池管理模块连接，电池管理模块能够对电池模块4以及电池模块4中的单体电池的电压进行检测，若电池模块4中有单体电池异常、电池模块4电压超出范围等异常，则该电池模块4与正极并联母线5和负极并联母线6之间的正极并联继电器K3和负极并联继电器K4不闭合，电池管理系统发出提示，该电池模块4可采用人工维护，当电池模块4中有单体电池的电压、电池模块4电压在正常范围内时，则闭合该电池模块4与正极并联母线5和负极并联母线6之间的正极并联继电器K3和负极并联继电器K4，进行储能系统的电压均衡。The battery module 4 is connected to the battery management module, and the battery management module can detect the voltage of the battery module 4 and the battery cells in the battery module 4. If there is an abnormal battery in the battery module 4 and the voltage of the battery module 4 is out of range If the battery module 4 is abnormal, the positive parallel relay K3 and the negative parallel relay K4 between the battery module 4 and the positive parallel bus 5 and the negative parallel bus 6 are not closed, and the battery management system issues a prompt that the battery module 4 can be maintained manually. When there is a single battery voltage in the module 4 and the voltage of the battery module 4 is within the normal range, close the positive parallel relay K3 and the negative parallel relay K4 between the battery module 4 and the positive parallel bus 5 and the negative parallel bus 6 to carry out Voltage equalization of energy storage systems.
综上所述，本实用新型提供了一种用于储能系统电池模块的电压均衡电路，电池管理模块控制主继电器、电池簇继电器断开，控制电池模块的正极并联继电器和负极并联继电器闭合，利用并联电池电压一致的原理，使各电池模块并联均衡，各电池模块电压均衡后采用串联运行，本实用新型能够实现电池簇内各电池模块以及不同簇内电池模块间快速、高效均衡，而且均衡方案可靠性高、成本低，能使电池堆内部各模块电压达到高度一致性，提高电池系统电压一致性，延长系统运行时间与使用寿命。In summary, the utility model provides a voltage equalization circuit for the battery module of the energy storage system. The battery management module controls the main relay and the battery cluster relay to be disconnected, and controls the positive parallel relay and the negative parallel relay of the battery module to be closed. Utilizing the principle of consistent battery voltage in parallel, each battery module is balanced in parallel, and each battery module is operated in series after the voltage of each battery module is balanced. The solution has high reliability and low cost, which can make the voltage of each module inside the battery stack highly consistent, improve the voltage consistency of the battery system, and prolong the system's operating time and service life.
以上所述，仅为本实用新型的较佳实施例而已，并非用于限定本实用新型的保护范围。The above descriptions are only preferred embodiments of the present utility model, and are not intended to limit the protection scope of the present utility model.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109245319A (en) * | 2018-11-13 | 2019-01-18 | 山东积成智通新能源有限公司 | A kind of retired battery energy storage system and method |
| CN109755948A (en) * | 2017-11-07 | 2019-05-14 | 银隆新能源股份有限公司 | Voltage equalization circuit for battery module of energy storage system and voltage equalization method thereof |
| CN110571886A (en) * | 2019-09-12 | 2019-12-13 | 上海电气国轩新能源科技有限公司 | Control method and system for voltage equalization of battery system |
| CN114204647A (en) * | 2022-01-06 | 2022-03-18 | 上海交通大学 | Parallel battery cluster state management system and parallel battery cluster |
| CN118539497A (en) * | 2024-07-26 | 2024-08-23 | 深圳市健网科技有限公司 | A distributed energy storage device with high-frequency isolation function |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109755948A (en) * | 2017-11-07 | 2019-05-14 | 银隆新能源股份有限公司 | Voltage equalization circuit for battery module of energy storage system and voltage equalization method thereof |
| CN109245319A (en) * | 2018-11-13 | 2019-01-18 | 山东积成智通新能源有限公司 | A kind of retired battery energy storage system and method |
| CN110571886A (en) * | 2019-09-12 | 2019-12-13 | 上海电气国轩新能源科技有限公司 | Control method and system for voltage equalization of battery system |
| CN114204647A (en) * | 2022-01-06 | 2022-03-18 | 上海交通大学 | Parallel battery cluster state management system and parallel battery cluster |
| CN114204647B (en) * | 2022-01-06 | 2023-11-24 | 上海交通大学 | Parallel battery cluster state management system and parallel battery cluster |
| CN118539497A (en) * | 2024-07-26 | 2024-08-23 | 深圳市健网科技有限公司 | A distributed energy storage device with high-frequency isolation function |
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